CN210155478U - Optical film layer structure, backlight module, liquid crystal display device and electronic equipment - Google Patents

Abstract

The application provides an optical film layer structure for gathering backlight light and penetrating detection light. The optical film layer structure comprises one or more film layer units, each film layer unit comprises a substrate and a plurality of microstructures, the substrate comprises an upper surface and a lower surface which are opposite, the microstructures are arranged on the upper surface at intervals, the interval part of the upper surface, which is not provided with the microstructures, is a first plane, and the lower surface at least comprises a second plane which is opposite to and parallel to the first plane. In addition, the application also provides a backlight module, a liquid crystal display device and electronic equipment comprising the optical film layer structure.

Description

Optical film layer structure, backlight module, liquid crystal display device and electronic equipment

Technical Field

The application belongs to the technical field of optics, especially relates to an optics rete structure, backlight unit, liquid crystal display device and electronic equipment.

Background

In the prior art, in order to increase the backlight brightness of the liquid crystal display panel, an optical film layer is usually disposed in the backlight module, for example: brightness Enhancement Film (BEF), prism sheet, and the like. Currently, the optical film layer includes a light-transmitting substrate and a microstructure of an elongated triangular prism formed on the light-transmitting substrate. The microstructures of the strip triangular prism are closely arranged on the light-transmitting substrate without intervals. When the backlight light from the backlight module enters the film layer unit, the microstructures of the strip triangular prisms are used for concentrating the scattered backlight light.

However, although the microstructure of the elongated triangular prism has a strong converging effect on the backlight light, the microstructure has a strong diverging effect on the detection light reflected back to the liquid crystal display screen from an external object, so that the detection light cannot be focused and imaged below the backlight module. Therefore, the current light path requirement that the sensing module is arranged below the liquid crystal display screen to realize various sensing functions under the screen cannot be met.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problems, the present application provides a novel optical film structure, a backlight module, a liquid crystal display device and an electronic apparatus.

The application provides an optics rete structure for it is shaded light and sees through the testing light to converge, optics rete structure includes one or more rete unit, and each rete unit includes base and a plurality of microstructure, the base includes relative upper surface and lower surface, a plurality of microstructures are in be the interval on the upper surface and arrange, wherein, be not provided with on the upper surface the interval part of microstructure is first plane, the lower surface include at least with the relative and parallel second plane of first plane.

In some embodiments, when the detection light passes through the film layer unit through the first plane and the second plane which are parallel and opposite, at least part of the detection light has a constant propagation direction, and the backlight light converges when the backlight light is incident to the film layer unit and exits from the microstructure.

In some embodiments, the lower surface is a flat surface.

In certain embodiments, the plurality of microstructures are triangular prisms or triangular pyramids.

In some embodiments, the plurality of microstructures are the same size and are equally spaced.

In certain embodiments, the absolute value of the difference between the refractive index of the material of the microstructures and the refractive index of the material of the substrate is greater than or equal to 0 and less than 0.2.

In some embodiments, when the optical film-layer structure is a monolithic film-layer unit, the plurality of microstructures is triangular pyramid and are arranged in a plurality of rows and columns on the substrate; setting an area of a lower surface of the substrate to S1, setting a total area of the first plane of the substrate to S2; setting a percentage of a total area S2 of the first plane of the substrate to an area S1 of the lower surface of the substrate to P, the percentage P being greater than or equal to 40% and less than 100%.

In certain embodiments, the percentage P is greater than or equal to 50% and less than 100%.

In some embodiments, when the optical film structure is a monolithic film unit, the plurality of microstructures are triangular pyramids and are arranged in a plurality of rows and a plurality of columns on the substrate; the first plane on the substrate has a width in the parallel direction of greater than or equal to 5 microns and less than 50 microns.

In some embodiments, when the optical film-layer structure includes a first film-layer unit and a second film-layer unit, the first film-layer unit and the second film-layer unit are stacked, wherein the plurality of microstructures on the first film-layer unit are triangular prisms and are arranged in a single row and multiple columns, and the plurality of microstructures on the second film-layer unit are triangular prisms and are arranged in a single column and multiple rows; setting the area of the lower surface of the substrate of the first film layer unit to be S1, setting the total area of the first plane of the substrate of the first film layer unit to be S2, setting the area of the lower surface of the substrate of the second film layer unit to be S3, and setting the total area of the first plane of the substrate of the second film layer unit to be S4; setting the percentage of the total area S2 of the first plane of the first film layer unit to the area S1 of the lower surface of the substrate of the first film layer unit to be P1, and setting the percentage of the total area S4 of the first plane of the substrate of the second film layer unit to the area S3 of the lower surface of the substrate of the second film layer unit to be P2; setting a product of the percentage P1 and the percentage P2 to be N, the product N being greater than or equal to 40% and less than 100%.

In certain embodiments, the percentage P is greater than or equal to 50% and less than 100%.

In some embodiments, when the optical film-layer structure includes a first film-layer unit and a second film-layer unit, the first film-layer unit and the second film-layer unit are stacked, the plurality of microstructures on the first film-layer unit are triangular prisms and are arranged in a single row and multiple columns, and the plurality of microstructures on the second film-layer unit are triangular prisms and are arranged in a single column and multiple rows; the width of the first plane on the substrate of the first film layer unit is greater than or equal to 5 micrometers and less than 50 micrometers, and/or the width of the first plane on the substrate of the second film layer unit is greater than or equal to 5 micrometers and less than 50 micrometers.

In some embodiments, the optical film structure is used in a backlight module for providing backlight for a display panel, when the optical film structure includes a first film unit and a second film unit, the first film unit and the second film unit are stacked, a plurality of microstructures on the first film unit are triangular prisms and are arranged in a single row and multiple columns, and a plurality of microstructures on the second film unit are triangular prisms and are arranged in a single column and multiple rows; and projecting along a direction vertical to the first light transmission part, wherein the area of an overlapping area of the first plane of the substrate of the first film layer unit and the first plane of the substrate of the second film layer unit is smaller than that of the pixel point of the display panel.

In some embodiments, the backlight light is visible light and the detection light is infrared or near-infrared light.

The application also provides a backlight module, including any one of the aforesaid optics rete structure, the diffusion piece and the reflector plate that optics rete structure range upon range of setting, the diffusion piece with optics rete structure is located the reflector plate top, the diffusion piece is the quantum dot membrane, the reflector plate is made by the material that sees through infrared or near-infrared light and reflects visible light.

The application also provides a liquid crystal display device, which comprises a display panel and a backlight module, wherein the display panel is used for displaying pictures, and the backlight module is used for providing backlight light for the display panel, wherein the backlight module is any one of the backlight module.

The present application further provides an electronic device, including any one of the above liquid crystal display devices and a sensing module at least partially disposed under the liquid crystal display device, wherein the sensing module receives detection light reflected or/and emitted from an external object through a display area of the display panel and the backlight module to perform corresponding sensing.

Because the optics rete structure of this application converges backlight and sees through to detection light again, and exists at least partly detection light and is seeing through the propagation direction behind the optics rete structure is unchangeable, the skew takes place for the position, consequently, is located to include the sensing module of the backlight unit below of optics rete structure is more accurate according to the relevant sensing data that this part of unchanged detection light of propagation direction obtained. Accordingly, the user experience of the electronic device is better.

Further, because this application sets up the microstructure through changing the micro-structure shape or/and the interval of rete unit, realize backlight and the two-way penetration of detection light under backlight unit's the prerequisite of not trompil, be favorable to realizing sensing under the screen under the prerequisite that does not influence display device's display effect to can further improve electronic equipment's the screen and account for than, promote electronic equipment's visual perception.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

Fig. 1 is a schematic front view of an electronic device provided in a first embodiment of the present application.

Fig. 2 is a schematic view of a part of the structure of the electronic device shown in fig. 1.

Fig. 3 is a schematic front view of an electronic device provided in a second embodiment of the present application.

Fig. 4 is a schematic diagram of a partial structure of the electronic device shown in fig. 3.

Fig. 5 is a schematic structural diagram of a backlight module according to a third embodiment of the present application.

Fig. 6 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present disclosure.

Fig. 7 is a schematic structural diagram of an optical film structure provided in a fifth embodiment of the present application.

Fig. 8 is a light path diagram of backlight light and detection light passing through the first film unit shown in fig. 7.

Fig. 9 is a schematic diagram illustrating a corresponding relationship between a pixel point and the optical film structure 5.

Figure 10 is a cross-sectional view of the first membrane layer unit of figure 7 taken along line IX-IX'.

Fig. 11 is a schematic structural diagram of an optical film structure provided in a sixth embodiment of the present application.

Fig. 12 is a schematic structural diagram of an optical film structure provided in a seventh embodiment of the present application.

Fig. 13 is a schematic structural diagram of an optical film structure provided in an eighth embodiment of the present application.

Fig. 14 is a schematic structural diagram of an optical film structure provided in a ninth embodiment of the present application.

FIG. 15 is a light path diagram of backlight light and detection light passing through the first film unit shown in FIG. 14.

Figure 16 is a cross-sectional view along XV-XV' of the first membrane layer unit shown in figure 14.

Fig. 17 is a schematic structural diagram of an optical film structure provided in a tenth embodiment of the present application.

Fig. 18 is a schematic structural diagram of an optical film structure provided in an eleventh embodiment of the present application.

Fig. 19 is a schematic structural diagram of an optical film structure provided in a twelfth embodiment of the present application.

Fig. 20 is a schematic structural diagram of an optical film structure provided in a thirteenth embodiment of the present application.

Fig. 21 is a schematic structural diagram of an optical film structure provided in a fourteenth embodiment of the present application.

Fig. 22 is a schematic structural diagram of an optical film structure provided in a fifteenth embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any order or number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either mechanically or electrically or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship or combination of two or more elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the present application, only the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application.

Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repeat use is intended to provide a simplified and clear description of the present application and is not intended to suggest any particular relationship between the various embodiments and/or arrangements discussed. In addition, the various specific processes and materials provided in the following description of the present application are only examples of implementing the technical solutions of the present application, but one of ordinary skill in the art should recognize that the technical solutions of the present application can also be implemented by other processes and/or other materials not described below.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

Referring to fig. 1 and fig. 2 together, a first embodiment of the present application provides an electronic device 1. The electronic device 1 is, for example but not limited to, a mobile phone, a notebook computer, a tablet computer, an electronic book, a personal digital assistant, a touch interactive terminal device, and the like. The electronic device 1 comprises a memory 12, a processor 14, a display device 3, and a sensing module 10 at least partially disposed on a back surface of the display device 3.

The display device 3 includes a display panel 30 and a backlight module 4 located below the display panel 30. The display panel 30 is used for displaying a picture. The backlight module 4 is used for providing backlight light for the display panel 30. The backlight light emitted from the backlight module 4 to the display panel 30 is visible light. The area of the display device 3 displaying the picture is defined as a display area, and the area outside the display area is defined as a non-display area. In the present embodiment, the display panel 30 is, for example, a liquid crystal display panel. However, the display panel 30 may alternatively be other suitable types of display panels, such as an electronic paper display panel.

The sensing module 10 is at least partially located below the backlight module 4 and is opposite to the display area. The sensing module 10 is configured to receive detection light emitted or/and reflected by an external object itself, and implement corresponding sensing according to the received detection light. For example, the sensing module 10 receives the detection light through the display panel 30 and the backlight module 4. Such as, but not limited to, a user's finger, a user's face or other suitable location, or other suitable object and not limited to a human body, etc.

Optionally, the sensing module 10 is further configured to emit detection light to the external object. For example, the sensing module 10 emits the detection light to an external object through the display panel 30 and the backlight module 4.

The sensing module 10 is used for example, but not limited to, performing biometric information sensing, two-dimensional and/or three-dimensional image sensing, three-dimensional stereo modeling, distance sensing, etc. according to the received detection light. Such biometric information sensing includes, for example and without limitation, fingerprint information sensing, three-dimensional facial information sensing, living body information sensing, and the like.

In the present embodiment, the sensing module 10 emits the detection light to the external object through the display panel 30 and the backlight module 4, and receives the detection light emitted or/and reflected from the external object through the display panel 30 and the backlight module 4. However, alternatively, the sensing module 10 may also emit the detection light to the external object without passing through the display device 3 or passing through a part of the elements of the display device 3, and the sensing module 10 receives the detection light emitted or/and reflected from the external object through the display panel 30 and the backlight module 4. Alternatively, the sensing module 10 emits the detection light to the external object through the display panel 30 and the backlight module 4, and the sensing module 10 does not receive the detection light emitted or/and reflected from the external object itself through the display device 3 or through a part of the elements of the display device 3.

It should be noted that the structural arrangement of the sensing module 10 is not limited to that shown in the drawings of the present application, and may be other various suitable structures.

The memory 12 is used, for example and without limitation, to pre-store a biometric information template for one or more samples. For another example, the memory 12 is used for storing data generated by the sensing module 10 during sensing, sensing-related programs, or data required for implementing sensing-related functions. The processor 14 is configured to perform corresponding processing on the sensing information obtained by the sensing module 10, for example, compare the biometric information obtained by the sensing module 10 with a biometric information template stored in the memory 12, and identify the external object according to the comparison result. As another example, the processor 14 may be used to execute sensing related programs. The electronic device 1 may correspondingly execute related functions according to the sensing result of the sensing module 10 or/and the processing result of the processor 14, such as: the method comprises the following steps of screen extinguishing, screen locking unlocking, payment, account login, next-level menu entry, permission opening and the like.

In the present embodiment, the memory 12 and the processor 14 are components provided in the electronic device 1 independently of the sensor module 10. However, alternatively, part or all of the memory 12 and/or the processor 14 may also be integrated in the sensing module 10.

The sensing module 10 includes a receiving unit 103. The receiving unit 103 is located below the backlight module 4 and directly faces the display area, and is configured to receive the detection light emitted or/and reflected by the external object through the display panel 30 and the backlight module 4, and implement corresponding sensing of the external object according to the received detection light.

Optionally, the receiving unit 103 includes a lens 104 and an image sensor 106 located below the lens 104. The detection light emitted or/and reflected by the external object itself is transmitted through the display panel 30 and the backlight module 4, and then received by the image sensor 106 through the lens 104. The image sensor 106 obtains an image or related sensing data of the external object according to the detected light, for example, so as to realize corresponding sensing. However, in some embodiments, the lens 104 may be omitted or replaced with other elements, such as a beam collimating element.

In this embodiment, the sensing module 10 further includes a transmitting unit 102. The emission unit 102 is disposed under the backlight module 4. The emitting unit 102 emits the detection light to the external object through the backlight module 4 and the display panel 30.

Optionally, the emission unit 102 comprises a sensing light source. The detection light emitted by the sensing light source 102 is reflected by an external object after passing through the display device 3, and then is turned back, and is received by the receiving unit 103 after passing through the display device 3 again, so as to extract the relevant characteristic data of the external object for identification, for example, but not limited thereto.

According to the sensing principle and the application scenario, the detection light has a specific wavelength. In this embodiment, the detection light may be used for, but is not limited to, sensing a three-dimensional image of a fingerprint or a human face, and may be infrared or near infrared light having a wavelength ranging from 800nm to 1650 nm. Alternatively, in other embodiments, the detection light may be other suitable detection signals, such as ultraviolet light, ultrasonic waves, electromagnetic waves, and the like.

Referring to fig. 3 and fig. 4 together, a second embodiment of the present application provides an electronic device 2, which has substantially the same structure as the electronic device 1 provided in the first embodiment, and the main differences are: the emitting unit 202 of the sensing module 20 is not disposed on the back of the display device 3, but disposed outside the display area of the display device 3, such as but not limited to, on the side of the display panel 30, or on the side of the backlight module 4, or at another suitable position of the electronic device 1. The detection light emitted by the emitting unit 202 does not need to be projected onto an external object through the display device 3 or through a part of elements of the display device 3, and such an arrangement may be suitable for a scene requiring a high emitting power of the emitting unit 202, such as but not limited to: the emitting unit 202 needs to project a light spot with a preset pattern on the external object to realize the sensing of the three-dimensional surface.

In the present embodiment, the emitting unit 202 is disposed at a center position of a top front surface of the electronic device 2, and emits the detection beam to an external object through a protective cover (not labeled) of the electronic device 2. The receiving unit 203 of the sensing module 20 is disposed below the backlight module 4, and is configured to receive the detection light emitted or/and reflected by the external object through the display device 3.

It should be noted that, in the embodiments of the present application, the description is mainly given by the sensing module 10 or 20 receiving the detection light emitted or/and reflected by the external object through the display panel 30 and the backlight module 4, but the present application is not limited thereto. For example, taking the sensing module 20 as an example, whether either or both of the transmitting unit 202 and the receiving unit 203 of the sensing module 20 are disposed below the backlight module 4 should fall within the protection scope of the present application.

Referring to fig. 5, a third embodiment of the present application provides a backlight module 4 that can be used in the display device 3. The backlight module 4 may be configured to gather the backlight light emitted toward the display panel 30 and transmit the detection light, so as to simultaneously satisfy the requirements of providing the backlight for the display panel 30 and disposing the sensing module 10 or 20 below the display device 3. The backlight module 4 includes a backlight source 40, a light guide plate 42, a reflective sheet 44, a diffusion sheet 46 and an optical film structure 5.

The light guide plate 42 includes a light emitting surface 420, a bottom surface 422 opposite to the light emitting surface 420, and a light incident surface 424 connected between the light emitting surface 420 and the bottom surface 422. The backlight source 40 is disposed corresponding to the light incident surface 424, and is configured to provide backlight light to the light guide plate 42. The backlight light is mixed in the light guide plate 42 and then emitted from the light emitting surface 420. The reflective sheet 44 is disposed on the bottom surface 422 of the light guide plate 42, and is used for reflecting the backlight light leaking from the light guide plate 42 back into the light guide plate 42, so as to improve the utilization rate of the backlight light. The reflective sheet 44 is made of, for example, a material that reflects visible light through the detection light, so that backlight light in the visible wavelength range can be reflected back to the light guide plate 42, while infrared or near-infrared detection light can be transmitted.

The optical film structure 5 is disposed on one side of the light emitting surface 420 of the light guide plate 42, and is configured to gather the backlight light emitted from the light guide plate 42, so as to improve the backlight brightness provided by the backlight module 4. In this embodiment, the optical film structure 5 includes a first film unit 501 and a second film unit 502. The first film layer unit 501 and the second film layer unit 502 have, for example, but not limited to, the same structure. The first film layer unit 501 is described as an example.

The first film layer unit 501 includes a first optical surface 503 and a second optical surface 504 disposed oppositely. The first optical surface 503 faces away from the light exit surface 420 of the light guide plate 42. The second optical surface 504 faces the light exit surface 420 of the light guide plate 42. When the backlight light passes through the first film layer unit 501, the backlight light is incident from the second optical surface 504 and then exits from the first optical surface 503. When passing through the first film layer unit 501, the detection light emitted and/or reflected by the external object itself enters from the first optical surface 503 and then passes through the second optical surface 504.

The first optical surface 503 is a continuous surface and the second optical surface 504 is a continuous surface. Wherein the first optical surface 503 is non-planar throughout.

The stacking direction of the light guide plate 42, the diffusion sheet 46 and the optical film layer structure 5 is defined as a vertical direction Y. The first optical surface 503 comprises a first plane 520 perpendicular to the vertical direction Y and the second optical surface 504 comprises a second plane perpendicular to the vertical direction. In this embodiment, the second optical surface 504 is a plane as a whole, and accordingly, the second optical surface 504 is the second plane. However, alternatively, in some embodiments, the second optical surface 504 may not be a plane as a whole, but may include a curved surface or an inclined surface not perpendicular to the vertical direction Y, in addition to the second plane.

The first plane 520 is parallel to the second plane, and according to the principle of optical refraction, when the detection light passes through the first film layer unit 501, at least a part of the detection light has a constant propagation direction and a position shift after passing through the parallel first plane 520 and second plane.

In this embodiment, the first optical surface 503 includes a plurality of first planes 520 arranged at intervals. Each first plane 520 is disposed opposite to the second plane. At least a part of the detection light passing through the first film layer unit 501 via the first plane 520 and the second plane opposite to each other has a constant propagation direction and a shifted position. Accordingly, the sensing module 10 or 20 obtains more accurate sensing information according to the received detection light with the unchanged propagation direction.

It should be noted that, when the first film layer unit 501 is manufactured, due to the manufacturing process having errors or other adverse effects, the first plane 520 and the second plane of the actually manufactured first film layer unit 501 may not be perfectly parallel, i.e. the first plane 520 and the second plane are substantially parallel. Accordingly, the propagation direction of at least a portion of the detection beam transmitted through the first film layer unit 501 via the first plane 520 and the second plane is substantially unchanged.

The first plane 520 is defined as a first light-transmitting portion, and the first optical surface 503 further includes a second light-transmitting portion 522, where the second light-transmitting portion 522 is not perpendicular to the vertical direction Y. When the backlight light incident to the first film layer unit 501 exits from the second light transmission part 522, the light is converged.

The side edge of each first transparent portion 520 is connected to a second transparent portion 522. The second light-transmitting portion 522 includes a slope and/or a vertical surface. In the present embodiment, the second light transmission portion 522 includes a slope and a vertical surface (see also fig. 7). The inclined surface is inclined between the first light-transmitting portion 520 and the second optical surface 504. The vertical plane is perpendicular to the plane between the first light-transmitting portion 520 and the second optical surface 504. Wherein, two inclined planes are connected between adjacent first light transmission parts 520. An included angle between the adjacent first light transmission part 520 and the inclined surface is an obtuse angle. An included angle between two inclined surfaces between adjacent first light transmission parts 520 is an acute angle.

However, alternatively, in other embodiments, the second light transmission portions 522 may be both inclined surfaces or vertical surfaces.

Alternatively, in some embodiments, the first light-transmitting portions 520 and the second light-transmitting portions 522 may alternately appear along the direction in which the first light-transmitting portions 520 are arranged, for example, the vertical distances from the adjacent first light-transmitting portions 520 to the second optical surface 504 are different, and the included angles between the second light-transmitting portions 522 and the adjacent first light-transmitting portions 520 are obtuse angles.

The second film layer unit 502 has the same or similar structure as the first film layer unit 501, and the second film layer unit 502 is not described herein again. The first film-layer unit 501 is located above the second film-layer unit 502. Each of the first light transmission portions 520 of the first film layer unit 501 extends, for example, in a first direction. Each of the first light transmission portions 520 of the second film unit 502 extends in the second direction. The first direction is perpendicular to the second direction.

The area of the second optical surface 504 of the first film-layer unit 501 is set to S1. The total area (or sum of areas) of the first light transmission portions 520 of the first film layer unit 501 is set to S2. The area of the second optical surface 504 of the second film-layer unit 502 is set to S3. The total area (or sum of areas) of the first light transmission portions 520 of the second film layer unit 502 is set to S4.

Further, the percentage of the total area S2 of the first light-transmitting portions 520 of the first film-layer unit 501 to the area S1 of the second optical surface 504 of the first film-layer unit 501 is set to P1. The percentage of the total area S4 of the first light-transmitting portions 520 of the second film-layer unit 502 to the area S3 of the second optical surface 504 of the second film-layer unit 502 is set to P2. The product of the percentage P1 and the percentage P2 is set to N.

The utility model discloses the people is through a large amount of experiments and analysis verification discovery, works as product N equals or is greater than 50% and is less than 100% the unchangeable volume of detecting light of direction of propagation of 5 outgoing of optics rete structure is more suitable, thereby, sensing module 10 is more accurate according to the sensing information that received detection light obtained.

Alternatively, in some embodiments, the optical film layer structure 5 may also be a single-layer film structure. Accordingly, the total area of each first light-transmitting portion 520 of the monolithic film layer structure 5 accounts for, for example, 50% or more and 100% or less of the area of the second optical surface 504.

Alternatively, in certain embodiments, the product N may also be less than 50%, such as but not limited to greater than or equal to 40% and less than 50%.

The diffusion sheet 46 is disposed on one side of the light emitting surface 420 of the light guide plate 42, and is used for diffusing the backlight light to achieve an atomization effect.

The diffusion sheet 46 diffuses backlight light in the visible wavelength range to transmit infrared or near-infrared detection light. For example: the wavelength range of the backlight light is 380nm to 760nm, for example. The wavelength range of the detection light is, for example, 800nm to 1650 nm. The diffusion of light by the diffuser 46 can be measured by haze. The haze is a percentage of the light intensity of the transmitted light, which is deviated from the incident direction by more than 2.5 degrees after passing through the diffusion sheet 46, to the light intensity of the original total incident light. The higher the haze of the light transmitted through the diffuser 46, the stronger the diffusion effect of the diffuser 46 on the light, and the diffuser 46 is considered to have the diffusion effect on the light when the haze exceeds 30%.

The diffuser 46 diffuses the backlight light more than the detection light. Optionally, the diffuser 46 has a haze for passing detection light of less than 30%.

The diffuser 46 may provide light diffusion by forming light diffusing structures on the substrate. In the present embodiment, the light diffusing structure may be a rough glass-like microstructure. The base material is a light-transmitting material, and can be selected from one or more of Polycarbonate (PC), polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET), or other materials meeting the light-transmitting requirement. The average size of the ground glass-like rough microstructure is within the visible light wavelength range of 380nm (Nanometer, nm) to 760nm, so that the ground glass-like rough microstructure has a relatively obvious diffusion effect on backlight light belonging to the visible light range and has relatively strong penetrability on infrared or near-infrared detection light with longer wavelength.

Alternatively, in other embodiments, the diffuser 46 may be made by incorporating diffusing particles on a substrate. When the backlight light passes through the diffusion sheet 46, the backlight light continuously passes through between the diffusion particles with different refractive indexes and the transparent base material, and multiple refraction, reflection and scattering phenomena occur, so that the optical diffusion effect is achieved. The diffusion particles may be made of a material that transmits infrared or near-infrared light and reflects visible light. The average size range of the diffusion particles is the same as the visible light wavelength range from 380nm to 760nm, so that the diffusion particles have a more obvious diffusion effect on backlight light belonging to the visible light range and have stronger penetrability on infrared or near-infrared detection light with longer wavelength.

Alternatively, in other embodiments, the diffuser 46 is a film layer having a nanoporous structure. The material of the Nanoporous membrane layer may be, but is not limited to, a polyethylene fabric (nanopoorous polythylene textile). The polyethylene fabric material is formed with a plurality of small holes with nanometer-scale sizes, and the size range of the small holes is 100nm to 1000nm, so that the polyethylene fabric material has the characteristic of transmitting infrared or near infrared rays and scattering visible light.

The present application is not limited to the diffuser 46 of the above embodiments, and the diffuser 46 may be of other suitable structures and/or materials.

The diffuser 46 may include an upper diffuser 461 and a lower diffuser 462. The upper diffusion sheet 461 and the lower diffusion sheet 462 have similar structures, and both can be used to diffuse backlight light and transmit detection light emitted or/and reflected by an external object. The upper diffuser 461 and the lower diffuser 462 have respective functional biases such as: the upper diffusion sheet 461 emphasizes the fogging effect of the backlight light, and the lower diffusion sheet 462 has a relatively high transmittance of the backlight light. The arrangement order of the upper diffusion sheet 461, the lower diffusion sheet 462, the first film layer unit 501 and the second film layer unit 502 is not particularly limited. For example, in the present embodiment, the first film layer unit 501 and the second film layer unit 502 are disposed between the upper diffusion sheet 461 and the lower diffusion sheet 462. Alternatively, however, in some embodiments, the upper diffuser 461 is disposed between the first film layer unit 501 and the second film layer unit 502. The lower diffusion sheet 462 is disposed between the second film-layer unit 502 and the light guide plate 42.

Referring to fig. 6, a fourth embodiment of the present invention provides a backlight module 4' that can be used in the display device 3 to replace the backlight module 4 and be applied to the display device 3. The backlight module 4' has substantially the same structure as the backlight module 4, and the two main differences are as follows: the diffuser 46 of the backlight module 4 is replaced with a quantum dot film. The quantum dot film 46 has a greater diffusion effect on backlight light than on infrared or near-infrared light.

The quantum dot film 46 contains a quantum dot material 463. The quantum dot material 463 can absorb the blue backlight light and convert the blue backlight light into the green backlight light and the red backlight light respectively, so that the backlight source 40 only needs to be a blue light emitting source, and a part of the emitted blue backlight light is absorbed by the quantum dot material 463 in the quantum dot film 46 and converted into the green backlight light and the red backlight light, and then is mixed with the unabsorbed part of the blue backlight light into the white backlight light to be emitted. Since the quantum dot material 463 emits the converted light outward around itself during the conversion luminescence and has a scattering effect, the white backlight light converted by the quantum dot film 46 has a better diffusivity. The quantum dot material 463 does not absorb light in the infrared or near-infrared wavelength range or absorbs less infrared or near-infrared light, and thus can transmit the detection light.

Alternatively, in other embodiments, the backlight source 40 may also emit ultraviolet light to the light guide plate 42, the ultraviolet light emitted from the light guide plate 42 enters the quantum dot film 46, and the quantum dot film 46 converts the ultraviolet light into red light, green light, and blue light and emits the converted visible light beam.

Utility model people is through a large amount of experimental analysis and verification discovery, when adopting quantum dot film 46 is when as the diffusion piece, two upper and lower diffusion pieces that it need not set up, and right detecting beam's diffusion is less, consequently, sensing module 10 is more accurate according to the corresponding sensing data that received detecting beam obtained.

It should be noted that the present application is not limited to the backlight module mentioned in the above embodiments, and the structure or material of the backlight module may also have other suitable modifications, and the utility model of the present application mainly focuses on the structure or material change of the optical film layer structure 5 and/or the structure or material change of the diffusion sheet 46, so that all technical solutions similar or identical to the technical idea of the present application should fall within the protection scope of the present application.

Referring to fig. 5 and 7 together, a fifth embodiment of the present application provides an optical film structure 5, which can be used in the backlight module of each embodiment having the dual-sheet optical film unit. The optical film layer structure 5 is used for gathering backlight light and enabling the transmission direction of at least part of detection light to be unchanged and the position of the detection light to deviate when the detection light penetrates through, so that the requirements of increasing the display brightness of the display device 3 and arranging the sensing module 10 or 20 below the display device 3 for sensing are met.

The optical film structure 5 includes a first film unit 501 and a second film unit 502. The structures of the first film layer unit 501 and the second film layer unit 502 are, for example, but not limited to, identical, and the first film layer unit 501 is taken as an example for description. In this embodiment, the first film layer unit 501 includes a substrate 500 and a plurality of microstructures 52. The substrate 500 includes an upper surface and a lower surface disposed opposite to the upper surface. The plurality of microstructures 52 are closely arranged on the upper surface of the substrate 500. The microstructures 52 are used to converge the backlight light and transmit the detection light, and at least a portion of the detection light has a constant propagation direction and a shifted position after passing through the microstructures 52 and the substrate 500.

In this embodiment, the plurality of microstructures 52 on the first film unit 501 are arranged in a single row and a plurality of columns, and each microstructure 52 extends along a first direction and is arranged along a second direction, where the first direction is a column direction and the second direction is a row direction. The plurality of microstructures 52 on the second film unit 502 are arranged in a single row and a plurality of rows, wherein each microstructure 52 extends along the second direction and is arranged along the first direction. The first direction is perpendicular to the second direction. Alternatively, the plurality of microstructures 52 on the first film unit 501 may be arranged in a single row and a plurality of rows, and the plurality of microstructures 52 on the second film unit 502 may be arranged in a single row and a plurality of columns.

In the present embodiment, the substrate 500 and the microstructures 52 are made separately and made of different materials. For example, the material of the substrate 500 may be selected from any one or a combination of Polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), or other materials that meet the above-mentioned light transmission requirements. The microstructures 52 are made of, for example, a curable material. In manufacturing, a curable material, such as UV glue, is coated on the substrate 500, the curable material is formed into a specific shape of the microstructure 52 by a molding process, and finally the microstructure 52 is cured.

Optionally, the absolute value of the difference in refractive index between the substrate 500 and the microstructures 52 is less than 0.3. The refractive index of the microstructure 52 is, for example, 1.45 to 1.55, and the refractive index of the substrate 500 is, for example, 1.6 to 1.8.

Preferably, the absolute value of the difference in refractive index between the substrate 500 and the microstructure 52 is less than 0.2. The refractive index of the microstructures 52 is less than the refractive index of the substrate 500. The refractive index of the microstructure 52 is, for example, 1.45 to 1.55, and the refractive index of the substrate 500 is, for example, 1.64.

The utility model discloses the people is through a large amount of experimental analysis and discoveries such as verification, the absolute value of the refractive index difference between basement 500 and the microstructure 52 is less, is favorable to promoting the sensing precision of sensing module 10 more. On one hand, since the absolute value of the refractive index difference between the substrate 500 and the microstructure 52 is small, the detection light emitted from the first film unit 501 has small or no deflection compared with the direction of the detection light when incident, and accordingly, the sensing module 10 can restore the real situation of the information to be sensed to a large extent according to the detection light received through the backlight module 4; on the other hand, since the absolute value of the refractive index difference between the substrate 500 and the microstructure 52 is small, the more the detection light transmitted by the first film unit 501 is, the less the reflected detection light is, so that the light transmittance of the detection light can be improved, and further, the detection light obtained by the sensing module 10 is increased, thereby further improving the sensing precision.

However, since different manufacturers use different materials, the refractive index difference between the substrate 500 and the microstructure 52 may be different, and accordingly, the absolute value of the refractive index difference therebetween may be greater than 0.3, but the sensing accuracy of the sensing module 10 or 20 is correspondingly reduced.

Each microstructure 52 includes an upper surface (or top surface), and the upper surface of the microstructure 52 is a side surface of the microstructure 52 opposite to the substrate 500. In the present embodiment, the entire upper surface of the microstructure 52 is a plane. The upper surface of the microstructure 52 is perpendicular to the vertical direction Y.

The upper surface and the lower surface of the substrate 500 are parallel planes, and are perpendicular to the vertical direction Y. Accordingly, the second optical surface 504 is a lower surface of the substrate 500. The first light-transmitting portion 520 of the first optical surface 503 is an upper surface of the microstructure 52.

Taking the first film-layer unit 501 as an example, each microstructure 52 further includes two first side surfaces 523 and two second side surfaces 524, where the first side surfaces 523 are side surfaces opposite to or intersecting the first direction, and the second side surfaces 524 are side surfaces extending along the first direction. In the present embodiment, the second side surface 524 is an inclined surface, and the first side surface 523 is a perpendicular surface. The second light transmitting portion 522 includes the second side surface 524 and the first side surface 523.

Along the arrangement direction of the microstructures 52, two connected second side surfaces 524 exist between the adjacent first light-transmitting portions 520. The included angle between the adjacent first light-transmitting portions 520 and the second side surface 524 is an obtuse angle. An included angle between the second side surfaces 524 positioned between the adjacent first light-transmitting portions 520 is an acute angle.

Alternatively, the microstructures 52 are, for example, but not limited to, terraces.

In the present embodiment, the microstructures 52 have the same structure and size. The vertical distances from each first light-transmitting portion 520 to the second optical surface 504 are the same.

However, alternatively, in some embodiments, the vertical distance from the first light-transmitting portion 520 to the second optical surface 504 of the plurality of microstructures 52 may also be different.

Referring to fig. 2 or fig. 4, when the sensing module 10 or 20 performs sensing, when the detection light emitted and/or reflected by the external object itself is transmitted to the first film unit 501, there is a situation that at least a part of the detection light has a substantially unchanged propagation direction and a shifted position after passing through the second optical surface 504 of the first film unit 501 via the first light-transmitting portion 520 and passing through the second optical surface 504 of the second film unit 502 via the first light-transmitting portion 520, so that the relevant sensing data or information about the external object obtained by the receiving unit 103 or 203 is relatively accurate.

When the optical path is reversible, after the detection light beam emitted by the sensing module 10 passes through the optical film structure 5, the propagation direction of at least part of the detection light beam is unchanged, and the position is shifted.

However, compared to transmitting the detection beam to the external object through the display device 3, the sensing module 10 transmits the detection beam transmitted or/and reflected by the external object through the display device 3, and the propagation direction of the detection beam passing through the optical film structure 5 is not changed, so that a more accurate sensing result can be obtained.

Further, the backlight light may converge while passing through the second light-transmitting portions 522 of the second film unit 502 and the second light-transmitting portions 522 of the first film unit 501, so as to improve the brightness of the backlight light.

In the present embodiment, the product N is greater than or equal to 50% and less than 100%. However, it may be altered that in some embodiments, the product N may also be less than 50%, for example greater than or equal to 40% and less than 50%.

Referring to fig. 8, since the distance between the first light-transmitting portion 520 of the first optical surface 503 and the second optical surface 504 is substantially constant, that is, the distance is substantially parallel to each other, it can be known from the law of optical refraction that: the propagation direction of the light rays passing through at least a portion of the second optical surface 504 via the first light transmitting portion 520 is substantially unchanged, and the position is shifted by D. For clarity of understanding, for example, the detection light ray entering from the first light-transmitting portion 520 is named as O1, the detection light ray O1 exits from the second optical surface 504 after being refracted multiple times in the first film layer unit 501, and this detection light ray exiting from the second optical surface 504 is named as O2. As can be seen from the law of optical refraction, the detected light O2 is mainly shifted in position by D compared with the detected light O1, and the transmission direction is unchanged.

It is to be understood that fig. 8 is a schematic diagram. When the refractive indexes of the materials of the microstructure 52 and the substrate 500 are different, the refraction phenomenon occurring when the detection light is transmitted at the interface between the microstructure 52 and the substrate 500 is not explicitly shown in fig. 8.

Conversely, when the detection light is transmitted from the second optical surface 504 to the first optical surface 503, there is a case where the transmission direction of at least a part of the detection light is unchanged and the position thereof is shifted after passing through the first light-transmitting portion 520. For example, when the emission unit 102 (see fig. 2) is located below the backlight module and emits the detection light through the optical film structure 5, at least some of the detection light has a substantially unchanged transmission direction and a shifted position before and after passing through the optical film structure.

It is understood that there may be a reasonable range of deviation in the parallel relationship between the first light-transmitting portion 520 of the first optical surface 503 and the second optical surface 504 due to manufacturing tolerance or machining precision.

Because the second light-transmitting portion 522 of the first optical surface 503 is not parallel to the second optical surface 504, according to the light refraction rule, the light transmitted through the optical film structure 5 via the second light-transmitting portion 522 is deflected in a relatively obvious direction, so that the light-transmitting optical film structure can be used for gathering backlight light along a preset direction to improve backlight brightness.

Alternatively, in some embodiments, the microstructures 52 may be a unitary structure with the substrate 500, both of which may be the same or different materials. In addition, when the microstructure 52 and the substrate are separately manufactured, the materials of the two may be the same.

In some embodiments, the microstructures 52 and substrate 500 may also be two separate film layers bonded together by an adhesive. The adhesive may include, but is not limited to, a pressure sensitive adhesive or a uv curable adhesive.

Referring to fig. 2 and 9, fig. 9 is a schematic view illustrating a corresponding relationship between a pixel point R of the display panel 30 and the optical film structure 5. The display panel 30 includes a plurality of pixel points, for example but not limited to, a plurality of red (R) pixel points, a plurality of green (G) pixel points, and a plurality of blue (B) pixel points, and the plurality of red (R) pixel points, the plurality of green (G) pixel points, and the plurality of blue (B) pixel points are arranged according to a predetermined rule. Typically, the pixel points are the same size, such as a square with a length and width in the range of 30 microns to 50 microns. The red (R) pixel is now taken as an example for explanation.

As can be seen from the optical principle, the backlight light passing through the second light transmission portions 522 is more converged than the backlight light passing through the first light transmission portions 520, and accordingly, the luminance of the backlight light passing through the second light transmission portions 522 is higher than the luminance of the backlight light passing through the first light transmission portions 520.

For simplicity and clarity, an overlapping area of the first light-transmitting portion 520 on the first film layer unit 501 and the first light-transmitting portion 520 on the second film layer unit 502 when projected in a direction opposite to the vertical direction Y is defined as M. The overlap region M is also square.

Preferably, the area or the width of the overlapping region M is smaller than the area or the width of the pixel point R, so that both the backlight light passing through the first light-transmitting portion 520 and the backlight light passing through the second light-transmitting portion 522 can be irradiated to the pixel point R. With such an arrangement, the backlight brightness of each pixel point on the display panel 30 is uniform. In addition, the transmittance of the detection light ray with small or basically unchanged change of the propagation direction after passing through the optical film layer structure 5 is also suitable, so that the sensing module 10 or 20 can perform corresponding detection.

It is understood that, in some embodiments, the red (R), green (G), and blue (B) pixels of the display panel 30 may not be all the same size. In addition, each pixel point or each overlap region M may also be, for example, a rectangle, but is not limited to a square. Preferably, the area of the overlapping region M is smaller than the area of the pixel point.

Optionally, in a specific embodiment, the projection is performed along a direction perpendicular to the first light-transmitting portion 520, and the overlapping areas M of the first light-transmitting portions 520 on the first film unit 501 and the first light-transmitting portions 520 on the second film unit 502 are respectively disposed opposite to the pixels of the display panel 30 one by one and located within a range where the corresponding pixels are located.

However, it is changeable that the projection is performed along the direction perpendicular to the first light-transmitting portions 520, each or a part of the multiple overlapping regions M of the multiple first light-transmitting portions 520 on the first film layer unit 501 and the multiple first light-transmitting portions 520 on the second film layer unit 502 is respectively disposed opposite to a pixel point in the display panel 30, and is located within the range where the opposite pixel point is located or does not completely fall within the range where the opposite pixel point is located.

In addition, one pixel point may also correspond to multiple overlapping regions M and is not limited to one overlapping region M.

Of course, the area of the overlapping area M may also be larger than the area of the pixel point, and the display effect of the display panel is relatively poor.

Referring to fig. 10, taking the microstructure 52 as a step as an example for description, the cross section of the first film layer unit 501 along the vertical direction Y and along the arrangement direction among the microstructures 52 is trapezoidal. Preferably, the trapezoid is an isosceles trapezoid, a base angle θ of the isosceles trapezoid ranges from 40 degrees to 50 degrees, a width K of the first light transmission portion 520 ranges from greater than or equal to 5 micrometers to less than 50 micrometers, and a height H ranges from 10 micrometers to 25 micrometers.

Utility model people verify through a large amount of experiments and analysis, discover after detection light passes through the optics rete structure 5 that has above-mentioned size range's micro-structure 52, the volume of detection light that the skew takes place for direction of propagation invariant, position is more suitable, is favorable to sensing module 10 or 20 to carry out corresponding sensing. In addition, the convergence effect of the backlight light after passing through the optical film layer structure 5 is relatively suitable for the display effect.

It should be noted that the base angle θ of the isosceles trapezoid is the included angle between the second side surface 524 and the second plane. The base angle θ is preferably 45 degrees.

Further, when the width K is less than or equal to 25 micrometers, the backlight converging effect of the first film layer unit 501 is strong, and the light flux of the detection light passing through the first film layer unit 501 and having no change in the propagation direction is also relatively suitable.

Alternatively, in some embodiments, according to the combined requirements of the customer for the backlight effect and the detection effect, and in addition, considering the difference of the size, the material, and the like of the product, for example, under the condition that the product N is greater than or equal to 50% and less than 100%, the manufacturer may further adjust the parameters of the width, the height H, the bottom angle θ, and the like of the microstructure 52 in combination to meet the different requirements of different customers for the product.

Referring to fig. 11, a sixth embodiment of the present application provides an optical film structure 5' that can be applied to the backlight module of each embodiment of the dual-sheet optical film unit in place of the optical film structure 5. The optical film structure 5' is substantially the same as the optical film structure 5, and the main difference is that: the second optical surface 504 of the first film-layer unit 501 of the optical film-layer structure 5' is provided with a light diffusion layer 505 for diffusing light. The light diffusion layer 505 is a layer of rough texture like ground glass to diffuse incident backlight light. It is understood that the light diffusing layer 505 may be molded directly onto the second optical surface 504, or a coating may be applied to the second optical surface 504 and then molded into a rough texture in the form of a ground glass. The material of the light diffusion layer 505 may be different from the substrate 500 of the first film layer unit 501, and may be a material that can transmit infrared light or near infrared light and reflect visible light. The rough texture may be, for example, a plurality of small protrusions. The average size of the small protrusions can be in a visible light wavelength range of 380 nanometers (nm) to 760nm, so that the small protrusions can have a relatively obvious scattering effect on visible light and have relatively strong penetrability on infrared or near-infrared detection light with longer wavelength.

It should be noted that, when the optical film structure 5' is applied to the backlight module 4, one of the upper diffusion sheet 461 or the lower diffusion sheet 462 may be omitted. In addition, the diffusion layer 505 may alternatively be formed on the second optical surface 504 of the second film-layer unit 502.

Referring to fig. 12, a seventh embodiment of the present application provides an optical film structure 5 "which can be applied to the backlight module of each embodiment having the dual-sheet optical film unit in place of the optical film structure 5. The optical film structure 5 "is substantially the same as the optical film structure 5', and the main difference is that: the light diffusion layer 505 of the optical film layer structure 5 ″ includes a flat portion 506. The flat portion 506 has a flat surface on a side opposite to the second optical surface 504, so that when the detection light emitted or/and reflected by the external object itself passes out from the flat portion 506, scattering of the detection light can be reduced. Accordingly, the sensing information obtained by the sensing module 10 or 20 under the display device 3 according to the received detection light is closer to the real information.

Referring to fig. 13, an eighth embodiment of the present application provides an optical film structure 5' ″ which can be applied to the backlight module having the dual-sheet optical film unit in place of the optical film structure 5. The optical film structure 5 '"is substantially the same structure as the optical film structure 5', and the main difference is that: the light diffusion layer 505 of the optical film layer structure 5' "is a coating layer formed on the second optical surface 504 and a plurality of diffusion particles 507 for diffusing light are doped in the coating layer. It is understood that the diffusion particles 507 may be made of a material that is transparent to infrared or near infrared light and reflects visible light. The average size range of the diffusion particles 507 is the same as the visible light wavelength range between 380nm and 760nm, so that the diffusion particles can have a significant scattering effect on visible light and have strong permeability to infrared or near-infrared detection light with longer wavelength.

Referring to fig. 14 and 15 together, a ninth embodiment of the present application provides an optical film structure 5 "", which can be applied to the backlight module of each embodiment having the dual-sheet optical film unit instead of the optical film structure 5. The optical film layer structure 5 "" is substantially the same as the optical film layer structure 5, and the main difference between the two is that: the plurality of microstructures 52 of the optical film layer structure 5 "" are arranged at intervals on the substrate 500.

Preferably, the plurality of microstructures 52 have the same structure and size, and the plurality of microstructures 52 are arranged at equal intervals. However, the plurality of microstructures 52 may have different structures and sizes and be arranged at unequal intervals.

Since the portion of the upper surface of the substrate 500 where the microstructure 52 is not formed is a flat plane and is parallel to the second plane, the space portion of the upper surface of the substrate 500 where the microstructure 52 is not formed is also the first plane of the first optical film layer unit 501, i.e. the first light-transmitting portion 520. At least part of the detection light rays are transmitted in the same direction and have different positions after passing through the first light-transmitting part 520 and the second optical surface 504 on the substrate 500.

A second light transmission part 522 is connected between the adjacent first light transmission parts 520, and included angles between the second light transmission parts 520 and the adjacent first light transmission parts 520 are obtuse angles. In contrast, two second light-transmitting portions 522 are connected between adjacent second light-transmitting portions 520 of the optical film layer structure 5. Therefore, in the present embodiment, the area of the second light transmission portion 522 between the adjacent first light transmission portions 520 can be relatively small, and thus the uniformity of the detection light when passing through the optical film layer structure 5 "" is better than that when passing through the optical film layer structure 5. Accordingly, the sensing data obtained by the sensing module 10 or 20 is better. In addition, the backlight convergence effect of the optical film layer structure 5' is also better.

Referring to fig. 9 again, similar to the structure of the optical film structure 5, preferably, the area or width of the overlapping region M of the first light-transmitting portion 520 of the optical film structure 5 "" is smaller than the area or width of the pixel point R, so that both the backlight light passing through the first light-transmitting portion 520 and the backlight light passing through the second light-transmitting portion 522 can be irradiated to the pixel point R. With such an arrangement, the backlight brightness of each pixel point on the display panel 30 is uniform, and the sensing module 10 or 20 located below the backlight module 4 receives the detection light appropriately, so as to obtain a better sensing effect.

Referring to fig. 16, taking the microstructure 52 as a step as an example for description, the cross section of the first film layer unit 501 along the vertical direction Y and along the second direction is trapezoidal. Preferably, along the arrangement direction of the microstructures 52, the distance G between adjacent microstructures 52 is equal, and the distance G is smaller than the width K of the first light-transmitting portion 520 on the microstructures 52 and is greater than or equal to one quarter of the width K. Therefore, the uniformity of the detection light and the backlight light can be ensured to be better under the condition that the number of the microstructures 52 on the first film layer unit 501 is enough.

Further, the trapezoid is an isosceles trapezoid having a base angle θ ranging from 40 degrees to 50 degrees, a height ranging from 10 micrometers to 25 micrometers, and a width K ranging from greater than or equal to 5 micrometers to less than 50 micrometers.

The utility model discloses the people is verified through a large amount of experiments and analysis, finds that after detecting light through the first rete unit 501 that has above-mentioned size range, the volume of the detection light that the skew takes place for direction of propagation invariant, position is more suitable, is favorable to sensing module 10 or 20 (see fig. 2 and fig. 4) to carry out corresponding sensing. In addition, the convergence effect of the backlight light after passing through the optical film layer structure 5 is relatively suitable for the display effect.

Alternatively, for the adjacent first light-transmitting portions 520: the sum of the width of the first light-transmitting portion 520 on the microstructure 52 and the width of the first light-transmitting portion 520 on the substrate 500 is greater than or equal to 5 micrometers and less than 50 micrometers. With such an arrangement, the backlight converging effect of the display device 3 is stronger and the sensing effect of the sensing module 10 or 20 is more accurate.

Optionally, the distance G is smaller than the width K of the first light-transmitting portion 520 on the microstructure 52 and greater than or equal to one half of the width K.

Optionally, the distance G is smaller than the width K of the first light-transmitting portion 520 on the microstructure 52.

However, alternatively, in some embodiments, according to the combined requirements of the customer for the backlight effect and the detection effect, in addition, considering the difference of the size, the material, and the like of the product, for example, under the condition that the product N is greater than or equal to 50% and less than 100%, and the distance G is less than the width K, the manufacturer may further combine to adjust the parameters of the width K, the height H, the bottom angle θ, and the like between the microstructures 52 to meet different requirements of different customers for the product.

In this embodiment, the total area S2 of the first light-transmitting portions 520 of the first film layer unit 501 includes the total area of the first light-transmitting portions 520 on the microstructures 52 and the total area of the first light-transmitting portions 520 on the substrate 500. Similarly, the total area S4 of the first light-transmitting portions 520 of the second film layer unit 502 includes the total area of the first light-transmitting portions 520 on the microstructures 52 and the total area of the first light-transmitting portions 520 on the substrate 500. The product N is greater than or equal to 50% and less than 100%.

Alternatively, in certain embodiments, the product N may also be less than 50%, such as greater than or equal to 40% less than 50%.

Referring to fig. 17, a tenth embodiment of the present application provides an optical film structure 6, which can be applied to the backlight module of each embodiment of the dual-sheet optical film unit in place of the optical film structure 5. The optical film structure 6 is substantially the same as the optical film structure 5 "", and the main difference between the two structures is that: the second light-transmitting portion 622 of the microstructure 62 of the optical film layer structure 6 is a vertical plane and perpendicular to the space between the first light-transmitting portion 620 and the second optical surface 604.

In the present embodiment, the microstructure 62 is a rectangular parallelepiped.

The product N is equal to 100%.

Referring to fig. 18, an eleventh embodiment of the present application provides an optical film structure 7, which can be applied to the backlight module of each embodiment of the dual-sheet optical film unit in place of the optical film structure 5. The optical film layer structure 7 has substantially the same structure as the optical film layer structure 6, and the main difference is that: the microstructure 72 of the optical film structure 7 is a long-strip triangular prism. The microstructures 72 on the first film-layer unit 701 and the second film-layer unit 702 are arranged at intervals.

Preferably, the triangular prism is an isosceles triangular prism. The plurality of microstructures 72 have the same structure and size and are arranged at equal intervals.

The spacing portion on the upper surface 703 of the substrate 700 is a first plane 720 or a first light-transmitting portion 720. The side surface of the microstructure 72 is a second light-transmitting portion 722.

The area of the bottom surface 704 of the substrate 700 of the first film layer unit 701 is set to S1, the total area of the first planes 720 of the substrate 700 of the first film layer unit 701 is set to S2, the area of the bottom surface 704 of the substrate 700 of the second film layer unit 702 is set to S3, and the total area of the first planes 720 of the substrate 700 of the second film layer unit 702 is set to S4. The percentage of the total area S2 of the first plane 720 of the first film layer unit 701 to the area S1 of the lower surface 704 of the substrate 700 of the first film layer unit 701 is set as P1, and the percentage of the total area S4 of the first plane 720 of the substrate 700 of the second film layer unit 702 to the area S3 of the lower surface 704 of the substrate 700 of the second film layer unit 702 is set as P2. Setting a product of the percentage P1 and the percentage P2 to be N, the product N being greater than or equal to 40% and less than 100%. Therefore, the amount of the detection light rays passing through the optical film layer structure 7 with the unchanged propagation direction is suitable, which is beneficial for the sensing module 10 or 20 arranged below the backlight module 4 to perform sensing. In addition, the converging effect of the backlight light is also suitable.

Preferably, the percentage P is greater than or equal to 50% and less than 100%.

Optionally, the width of the first plane 720 on the substrate 700 of the first film layer unit 701 is greater than or equal to 5 microns and less than 50 microns, and/or the width of the first plane 720 on the substrate 700 of the second film layer unit 702 is greater than or equal to 5 microns and less than 50 microns.

In addition, the projection is performed downward along a direction perpendicular to the first plane 720, and an area of an overlapping region of the first plane 720 of the substrate 700 of the first film unit 701 and the first plane 720 of the substrate 700 of the second film unit 702 is smaller than an area of a pixel point of the display panel 30. Therefore, the backlight effect of the display panel 30 is uniform, and the detection effect of the sensor module 10 or 20 is good.

In the present embodiment, the lower surface 704 is a plane and is parallel to the first plane 720, but alternatively, the lower surface 704 may include a second plane that is parallel to and opposite to the first plane 720.

Referring to fig. 19, a twelfth embodiment of the present disclosure provides an optical film structure 8, which can be applied to the backlight module of the above embodiments in place of the optical film structure 5. The optical film-layer structure 8 is a monolithic film-layer unit that is substantially identical to the first film-layer unit 501 of the optical film-layer structure 5, with the main differences being: the plurality of microstructures 82 of the optical film layer structure 8 are arranged on the substrate 800 in an array of rows and columns.

In this embodiment, the microstructure 82 is a landing.

In addition, the area of the second optical surface 804 of the optical film layer structure 8 is set to S1, and the total area of the first light-transmitting portions 820 of the optical film layer structure 8 is set to S2; setting the percentage of the total area S2 of the first light-transmitting portion 820 of the optical film structure 8 to the area S1 of the second optical surface 804 of the optical film structure 8 as P, where the percentage P is greater than or equal to 50% and less than 100%.

Alternatively, in certain embodiments, the product N may also be less than 50%, such as greater than or equal to 40% less than 50%.

Preferably, the area of the first light-transmitting portion 820 is smaller than the area of the pixel of the display panel 30. However, alternatively, the area of the first light-transmitting portion 820 may be larger than or equal to the area of the pixel of the display panel 30.

Optionally, each or a part of the first light-transmitting portions 820 is disposed opposite to one pixel of the display panel 30, and is located within a range where the opposite pixel is located or does not completely fall within the range where the opposite pixel is located.

In an embodiment, the projection is performed along a direction perpendicular to the first light-transmitting portion 820, and the plurality of first light-transmitting portions 820 on the optical film structure 8 and the plurality of pixels of the display panel 30 are disposed in a one-to-one manner, and are located within a range where the corresponding pixels are located.

In addition, one pixel point may correspond to a plurality of first light-transmitting portions 820.

Referring to fig. 20, a thirteenth embodiment of the present invention provides an optical film structure 8' that can be used in the backlight module, which is substantially the same as the optical film structure 8, and the main differences between the two embodiments are: the microstructures of the optical film layer structure 8' are arranged at intervals on the substrate 800.

The width of the first light-transmitting portion 820 on the substrate 800 in the column direction is smaller than the width of the first light-transmitting portion 820 on the microstructure 82 in the column direction and is greater than or equal to one fourth of the width of the first light-transmitting portion 820 on the microstructure 82 in the column direction; the width of the first light-transmitting portion 820 on the substrate 800 in the row direction is smaller than the width of the first light-transmitting portion 820 on the microstructure 82 in the row direction and is greater than or equal to one fourth of the width of the first light-transmitting portion 820 on the microstructure 82 in the row direction.

Optionally, the width of the first light-transmitting portion 820 on the substrate 800 in the column direction is smaller than the width of the first light-transmitting portion 820 on the microstructure 82 in the column direction and is greater than or equal to one half of the width of the first light-transmitting portion 820 on the microstructure 82 in the column direction; the width of the first light-transmitting portion 820 on the substrate 800 in the row direction is smaller than the width of the first light-transmitting portion 820 on the microstructure 82 in the row direction and is greater than or equal to one half of the width of the first light-transmitting portion 820 on the microstructure 82 in the row direction.

Optionally, the width of the first light-transmitting portion 820 on the substrate 800 in the column direction is smaller than the width of the first light-transmitting portion 820 on the microstructure 82 in the column direction; the width of the first light-transmitting portion 820 on the substrate 800 in the row direction is smaller than the width of the first light-transmitting portion 820 on the microstructure 82 in the row direction.

Referring to fig. 21, a fourteenth embodiment of the present application provides an optical film structure 9 that can be used in the backlight module, and is substantially the same as the optical film structure 8', and the main differences are: the second light transmission portions 922 of the microstructures of the optical film layer structure 9 are all vertical surfaces.

In the present embodiment, each of the microstructures 82 is a rectangular parallelepiped.

The percentage P is equal to 100%

Referring to fig. 22, a fifteenth embodiment of the present invention provides an optical film structure 9 'that can be used in the backlight module, which is substantially the same as the optical film structure 8', and the main differences are: the microstructure of the optical film layer structure 9' is a triangular pyramid.

The spacing portion on the upper surface 903 of the substrate 900 is a first plane 920 or a first light-transmitting portion 920. The side surface of the microstructure 92 is a second light-transmitting portion 922.

Setting the area of the lower surface 904 of the substrate 900 to S1, setting the total area of the first planes 920 of the substrate 904 to S2; the percentage of the total area S2 of the first plane 920 of the base 900 to the area S1 of the lower surface 904 of the base 900 is set to P, which is greater than or equal to 40% and less than 100%. Therefore, the amount of the detection light rays passing through the optical film layer structure 7 with the unchanged propagation direction is suitable, which is beneficial for the sensing module 10 or 20 arranged below the backlight module 4 to perform sensing. In addition, the converging effect of the backlight light is also suitable.

Preferably, the percentage P is greater than or equal to 50% and less than 100%.

Optionally, when the optical film structure 9 is a monolithic film unit, the plurality of microstructures 92 are triangular pyramids and are arranged in multiple rows and multiple columns on the substrate 900; the width of the first plane 920 on the substrate 900 in the row direction is greater than or equal to 5 micrometers and less than 50 micrometers.

In the present embodiment, the lower surface 904 is a plane and is parallel to the first plane 920, however, the lower surface 904 may alternatively include a second plane that is parallel to and opposite to the first plane 920.

The present application is not limited to the shape of the microstructure described in the above embodiments, and the microstructure may be a structure having other suitable shapes.

Alternatively, for the microstructures of the above embodiments, part of the microstructures may be closely arranged and part of the microstructures may be arranged at intervals.

Compared with the prior art, the optical film layer structure, the backlight module, the display device and the electronic equipment that this application embodiment provided can realize two-way penetration of backlight and detection light under the prerequisite of the display area of display device not trompil through setting up reasonable microstructure shape, are favorable to realizing sensing under the screen under the prerequisite that does not influence the display effect to further improve electronic equipment's screen and account for than, promote electronic equipment's visual perception.

It should be noted that, part or all of the embodiments of the present application, and part or all of the modifications, replacements, alterations, splits, combinations, extensions, etc. of the embodiments are considered to be covered by the inventive idea of the present application, and belong to the protection scope of the present application, without creative efforts.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents and improvements made within the spirit and principle of the present application are intended to be included within the scope of the present application.

Claims (19)

1. An optical film structure for converging backlight light and transmitting detection light, comprising: the optical film layer structure comprises one or more film layer units, each film layer unit comprises a substrate and a plurality of microstructures, the substrate comprises an upper surface and a lower surface which are opposite, the microstructures are arranged on the upper surface at intervals, the interval part of the upper surface, which is not provided with the microstructures, is a first plane, and the lower surface at least comprises a second plane which is opposite to and parallel to the first plane.

2. The optical film layer structure of claim 1, wherein: when the detection light passes through the film layer unit through the first plane and the second plane which are parallel and opposite, the propagation direction of at least part of the detection light is unchanged, and the backlight light converges when entering the film layer unit and emitting from the microstructure.

3. The optical film layer structure of claim 2, wherein: the lower surface is a plane.

4. The optical film layer structure of claim 1, wherein: the plurality of microstructures are triangular prisms or triangular pyramids.

5. The optical film layer structure of claim 4, wherein: the plurality of microstructures are the same in size and are arranged at equal intervals.

6. The optical film layer structure of claim 1, wherein: the absolute value of the difference between the refractive index of the material of the microstructure and the refractive index of the material of the substrate is greater than or equal to 0 and less than 0.2.

7. The optical film layer structure of claim 4, wherein: when the optical film layer structure is a monolithic film layer unit, the plurality of microstructures are triangular pyramids and are arranged on the substrate in multiple rows and multiple columns; setting an area of a lower surface of the substrate to S1, setting a total area of the first plane of the substrate to S2; setting a percentage of a total area S2 of the first plane of the substrate to an area S1 of the lower surface of the substrate to P, the percentage P being greater than or equal to 40% and less than 100%.

8. The optical film layer structure of claim 7, wherein: the percentage P is greater than or equal to 50% and less than 100%.

9. The optical film layer structure of claim 4, wherein: when the optical film layer structure is a single-chip film layer unit, the plurality of microstructures are triangular pyramids and are arranged on the substrate in multiple rows and multiple columns; the first plane on the substrate has a width in the parallel direction of greater than or equal to 5 microns and less than 50 microns.

10. The optical film layer structure of claim 4, wherein: when the optical film layer structure comprises a first film layer unit and a second film layer unit, the first film layer unit and the second film layer unit are stacked, wherein a plurality of microstructures on the first film layer unit are triangular prisms and are arranged in a single row and multiple columns, and a plurality of microstructures on the second film layer unit are triangular prisms and are arranged in a single row and multiple rows; setting the area of the lower surface of the substrate of the first film layer unit to be S1, setting the total area of the first plane of the substrate of the first film layer unit to be S2, setting the area of the lower surface of the substrate of the second film layer unit to be S3, and setting the total area of the first plane of the substrate of the second film layer unit to be S4; setting the percentage of the total area S2 of the first plane of the first film layer unit to the area S1 of the lower surface of the substrate of the first film layer unit to be P1, and setting the percentage of the total area S4 of the first plane of the substrate of the second film layer unit to the area S3 of the lower surface of the substrate of the second film layer unit to be P2; setting a product of the percentage P1 and the percentage P2 to be N, the product N being greater than or equal to 40% and less than 100%.

11. The optical film layer structure of claim 10, wherein: the percentage P is greater than or equal to 50% and less than 100%.

12. The optical film layer structure of claim 4, wherein: when the optical film layer structure comprises a first film layer unit and a second film layer unit, the first film layer unit and the second film layer unit are stacked, a plurality of microstructures on the first film layer unit are triangular prisms and are arranged in a single row and multiple columns, and a plurality of microstructures on the second film layer unit are triangular prisms and are arranged in a single row and multiple rows; the width of the first plane on the substrate of the first film layer unit is greater than or equal to 5 micrometers and less than 50 micrometers, and/or the width of the first plane on the substrate of the second film layer unit is greater than or equal to 5 micrometers and less than 50 micrometers.

13. The optical film layer structure of claim 4, wherein: the optical film structure is used in a backlight module for providing backlight for a display panel, when the optical film structure comprises a first film unit and a second film unit, the first film unit and the second film unit are stacked, a plurality of microstructures on the first film unit are triangular prisms and are arranged in a single row and multiple columns, and a plurality of microstructures on the second film unit are triangular prisms and are arranged in a single row and multiple columns; and projecting downwards along a direction vertical to the first plane, wherein the area of an overlapping area of the first plane of the substrate of the first film layer unit and the first plane of the substrate of the second film layer unit is smaller than that of the pixel point of the display panel.

14. The optical film layer structure of claim 1, wherein: the backlight light is visible light, and the detection light is infrared light or near-infrared light.

15. A backlight module is characterized in that: the backlight module comprises the optical film layer structure as claimed in any one of claims 1 to 14, a diffusion sheet and a reflection sheet, wherein the diffusion sheet and the optical film layer structure are stacked and positioned above the reflection sheet, the diffusion sheet is a quantum dot film, and the reflection sheet is made of a material which transmits infrared light or near infrared light and reflects visible light.

16. The backlight module of claim 15, wherein: and defining the stacking direction of the reflecting sheet, the diffusion sheet and the optical film layer structure as a vertical direction, wherein the first plane and the second plane are perpendicular to the vertical direction.

17. A liquid crystal display device, characterized in that: comprising a display panel for displaying pictures and a backlight module for providing backlight to said display panel, wherein said backlight module is the backlight module of the above claim 15 or 16.

18. An electronic device, characterized in that: the liquid crystal display device comprises the liquid crystal display device as claimed in claim 17 and a sensing module at least partially disposed under the liquid crystal display device, wherein the sensing module receives detection light reflected or/and emitted from an external object through a display area of the display panel and the backlight module to perform corresponding sensing.

19. The electronic device of claim 18, wherein: the sensing module is used for executing any one or more of fingerprint sensing, three-dimensional face sensing and living body sensing according to the received detection light.

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