CN115128871A - Backlight module, brightness control method thereof and display device - Google Patents
Backlight module, brightness control method thereof and display device Download PDFInfo
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- CN115128871A CN115128871A CN202211047555.2A CN202211047555A CN115128871A CN 115128871 A CN115128871 A CN 115128871A CN 202211047555 A CN202211047555 A CN 202211047555A CN 115128871 A CN115128871 A CN 115128871A
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The application relates to a backlight module, a brightness control method thereof and a display device. The backlight module comprises: the backlight module comprises a backlight plate, a middle frame, a light-emitting assembly and a diffusion plate, wherein the middle frame is enclosed in the periphery of the backlight plate to form a cavity, the light-emitting assembly and the diffusion plate are located in the cavity, the diffusion plate is located on one side, deviating from the light-emitting assembly, of the middle frame, a preset gap is formed between the diffusion plate and the middle frame, the middle frame comprises a light guide portion extending into the cavity, the light guide portion is provided with an incident surface and an emergent surface, a light supplementing piece is arranged on the light emergent side of the backlight plate and corresponds to the incident surface, and the emergent surface faces the preset gap. This application is through the setting of light supplementing piece and leaded light portion, can carry out the light filling to display device's peripheral shadow department to a great extent, and simple structure, and the lamp strip is located on the board in a poor light, makes things convenient for the structure integrative, reduces the part number, and the power supply line is simple.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a backlight module, a brightness control method thereof, and a display device.
Background
Incident light of a Light Emitting Diode (LED) is reflected by the white middle frame and enters the diffusion plate; an expansion space is reserved between the diffusion plate and the supporting surface of the middle frame, so that any one of the diffusion plate and the middle frame is prevented from being warped and deformed during high-temperature testing, light cannot be emitted into a region between the diffusion plate and the middle frame, insufficient light exists at the edge of a screen, the edge of the screen has a light and shade difference compared with the middle of the screen, and user experience is poor; in addition, the liquid crystal gap at the periphery of the liquid crystal screen is not supported enough, so that the problem of yellowing of the peripheral picture of the display module occurs, and the whole display effect of the display module is influenced.
Among the prior art, the technical scheme who is provided with a plurality of sub millimeter emitting diode (micro LED, MiniLED for short) in the reservation inflation space between the holding surface of diffuser plate and center is adopted more, make the reservation inflation space that originally the backlight can't shine supply luminance by MiniLED, the light that shines through MiniLED jets into the diffuser plate and carries out the illumination compensation, and MiniLED size is less, do not occupy unnecessary space, can set up in reserving the inflation space, can not influence the original function in reservation inflation space again, the problem of screen edge light not enough has been solved under the prerequisite of changing whole display module structure at minimum, make there is not the light and shade difference in the middle of screen edge and the screen, user experience is better.
However, in the prior art, the MiniLED needs to be arranged in the reserved expansion space, which results in a complicated structure of the light emitting module, numerous light bars and light panels, a large number of layers to be laid out, numerous components, and a complicated power supply circuit.
Disclosure of Invention
The application aims to provide a backlight module, a brightness control method thereof and a display device, and aims to enable the display device to be simple in structure, simple in circuit and few in parts.
In a first aspect, an embodiment of the present application provides a backlight module, including: the backlight module comprises a backlight plate, a middle frame, a light-emitting assembly and a diffusion plate, wherein the middle frame is enclosed at the periphery of the backlight plate to form a cavity, the light-emitting assembly and the diffusion plate are both located in the cavity, the diffusion plate is located on one side, deviating from the light-emitting assembly, of the middle frame, a preset gap is formed between the diffusion plate and the middle frame, the middle frame comprises a light guide portion extending into the cavity, the light guide portion is provided with an incident surface and an emergent surface, a light supplementing piece is arranged on the light emergent side of the backlight plate and corresponds to the incident surface, and the emergent surface faces towards the preset gap.
In an embodiment of the present application, the incident surface and the exit surface are disposed in parallel, and a front projection of the incident surface on the backlight plate and a front projection of the exit surface on the backlight plate are at least partially overlapped.
In an embodiment of the present application, the light guide part further includes a reflection surface located between the incident surface and the exit surface, and the reflection surface faces the inside of the backlight module.
In an embodiment of the present application, the middle frame further includes a reflection portion, and the reflection portion is located on a side of the light guide portion away from the reflection surface.
In an embodiment of the present application, the light guide part and the reflection part are integrally formed.
In an embodiment of this application, be equipped with supplementary light filling spare in the clearance, supplementary light filling spare includes: any one of the light reflecting sheet, the photoluminescent layer and the light condensing member.
In an embodiment of this application, light emitting component is the lamp plate, the lamp plate with light supplement spare is all located the light-emitting side of board in a poor light, just light supplement spare is located the lamp plate periphery.
In an embodiment of the application, the light emitting component is a light bar, the light bar is arranged on the side wall of the backlight plate, a light guide plate is further arranged in the cavity, and the light emitting side of the light bar is arranged opposite to any side of the light guide plate; the light supplementing piece is arranged on the light emitting side of the backlight plate, the front projection of the backlight plate is located on the periphery of the front projection of the backlight plate, and the light supplementing piece and the light bar are respectively located on different sides of the light guide plate.
In a second aspect, an embodiment of the present application provides a method for adjusting and controlling brightness of a backlight module, which is applied to the backlight module of any one of the first aspect, and includes the following steps:
acquiring a brightness difference threshold;
acquiring a first brightness value of a preset gap between the diffusion plate and the middle frame and a second brightness value of other positions, and calculating a brightness difference value between the first brightness value and the second brightness value;
and if the brightness difference value is higher than the brightness difference threshold value, starting a light supplementing piece to supplement light.
In a third aspect, an embodiment of the present application provides a display device, including: a display panel; and the backlight module according to any one of the first aspect, wherein the backlight module is disposed at a backlight side of the display panel, and the backlight module is configured to provide a light source for the display panel.
According to the present application, a backlight module is provided, which comprises: the backlight module comprises a backlight plate, a middle frame, a light-emitting assembly and a diffusion plate, wherein the middle frame is enclosed at the periphery of the backlight plate to form a cavity, the light-emitting assembly and the diffusion plate are both located in the cavity, the diffusion plate is located on one side, deviating from the light-emitting assembly, of the middle frame, a preset gap is formed between the diffusion plate and the middle frame, the middle frame comprises a light guide portion extending into the cavity, the light guide portion is provided with an incident surface and an emergent surface, a light supplementing piece is arranged on the light emergent side of the backlight plate and corresponds to the incident surface, and the emergent surface faces towards the preset gap. The light-emitting side through at the board in a poor light sets up the light supplementation spare, and the center has the light guide part, and the incident plane and the light supplementation spare of light guide part correspond the setting, and the emergent plane corresponds the setting with predetermineeing the clearance to in the light that the light supplementation spare sent can directly get into the expansion space through the light guide part, and need not to arrange the light supplementation spare in the expansion space, simple structure, light-emitting component's the number of piles is few, and the power supply line is simple.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, like parts are provided with like reference numerals. The drawings are not necessarily to scale, and are merely intended to illustrate the relative positions of the layers, the thicknesses of the layers in some portions being exaggerated for clarity, and the thicknesses in the drawings are not intended to represent the proportional relationships of the actual thicknesses.
Fig. 1 is a plan view of a display device according to a first embodiment of the present application;
fig. 2 shows a cross-sectional view of a display device provided in a first embodiment of the present application;
fig. 3 is a cross-sectional view of an inner frame of a display device according to a first embodiment of the present application;
fig. 4 is a cross-sectional view of another middle frame of a display device according to a first embodiment of the present application;
FIG. 5 illustrates a cross-sectional view of another display device provided in the first embodiment of the present application;
fig. 6 shows a plan view of the lamp panel provided in the first embodiment of the present application;
fig. 7 is a cross-sectional view showing a middle frame of another display device provided in the first embodiment of the present application;
fig. 8 shows a cross-sectional view of a display device provided in a second embodiment of the present application;
FIG. 9 illustrates a cross-sectional view of another display device provided in accordance with a second embodiment of the present application;
fig. 10 is a flowchart illustrating a brightness control method of a backlight module according to a third embodiment of the present disclosure.
Description of reference numerals:
100. a backlight module; 10. a backlight plate; 11. a backlight plate main body; 12. a surrounding baffle plate; 13. opening; 20. a middle frame; 22. a light guide part; 221. a reflective surface; 23. a reflection section; 31. a lamp panel; 311. a lamp bead; 32. a light guide plate; 40. a reflective sheet; 50. a diffusion plate; 60. an optical film set; 70. a light compensating piece;
200. a display panel; 201. a lower polarizer; 202. a thin film transistor; 203. a capacitor; 204. an upper polarizer;
300. and (4) a front frame.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof. In the drawings and the following description, at least some well-known structures and techniques have not been shown to avoid unnecessarily obscuring the present application; also, the size of the region structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The display device generally includes a display panel and a backlight module, wherein the display panel is a non-emissive light receiving element, the backlight module is disposed on a backlight side of the display panel and is used to provide a light source for the display panel, so that the display panel displays an image, and the display device is a liquid crystal display panel.
In the side-in type liquid crystal display device, the backlight module comprises a backlight plate, a middle frame, a reflector plate, a light guide plate, a light bar, a diffusion plate and an optical diaphragm group, the backlight plate comprises a backlight plate main body and an enclosing baffle enclosing the periphery of the backlight plate main body, the middle frame encloses the periphery of the enclosing baffle to form a cavity, the reflector plate and the light guide plate are arranged in the cavity, the light guide plate is arranged on one side, deviating from the backlight plate main body, of the reflector plate, the light bar is arranged on the enclosing baffle or the middle frame, the light emitting side of the light bar is opposite to one side of the light guide plate, the diffusion plate is arranged on one side, deviating from the backlight plate main body, of the light guide plate, the optical diaphragm group is arranged on the light emitting side of the diffusion plate, the middle frame is used for connecting the diffusion plate, and a preset gap is formed between the middle frame and the middle frame to prevent any one of the high-temperature testing diffusion plate and the middle frame from warping and deforming.
In straight following formula liquid crystal display device, backlight unit includes board in a poor light, center, lamp plate, reflector plate, diffuser plate and optical film group, and the board in a poor light includes board in a poor light main part and fence, fence enclose close in board in a poor light main part periphery, the center encloses close in fence periphery and forms the cavity, and in lamp plate and reflector plate located the cavity, the reflector plate was located between lamp plate and the board in a poor light main part, the diffuser plate is located the light guide plate and deviates from one side of board in a poor light main part, optical film group is located the light-emitting side of diffuser plate, just the center is used for connecting the diffuser plate, the two has the clearance of predetermineeing to arbitrary warpage that takes place in preventing high temperature test diffuser plate and the center.
For the two display devices, the preset gap can cause insufficient light at the edge of the screen, and the light and shade difference exists at the edge of the screen and in the middle of the screen, so that the user experience is poor; in addition, the liquid crystal gap at the periphery of the liquid crystal screen is not supported enough, so that the problem of yellowing of the peripheral picture of the display module occurs, and the whole display effect of the display module is influenced. Among the prior art, be provided with a plurality of sub-millimeter emitting diode (MiniLED)'s technical scheme in the reservation inflation space between the holding surface of diffuser plate and center more adopts, make the reservation inflation space that originally the backlight can't shine supply luminance by MiniLED, the light that shines through MiniLED jets into the diffuser plate and carries out the illumination compensation, and MiniLED size is less, do not occupy unnecessary space, can set up in reservation inflation space, can not influence the original function of reservation inflation space again, the problem that screen edge light is not enough has been solved under the prerequisite of changing whole display module structure at minimum, make screen edge and screen middle there is not the light and shade difference, user experience is better.
However, in the prior art, the MiniLED needs to be arranged in the reserved expansion space, which results in a complicated structure of the light emitting module, numerous light bars and light panels, a large number of layers to be laid out, numerous components, and a complicated power supply circuit.
In view of this, embodiments of the present disclosure respectively provide a backlight module, a brightness control method thereof, and a display device, where the backlight module includes: the backlight module comprises a backlight plate, a middle frame, a light-emitting assembly and a diffusion plate, wherein the middle frame is enclosed at the periphery of the backlight plate to form a cavity, the light-emitting assembly and the diffusion plate are both located in the cavity, the diffusion plate is located on one side, deviating from the light-emitting assembly, of the middle frame, a preset gap is formed between the diffusion plate and the middle frame, the middle frame comprises a light guide portion extending into the cavity, the light guide portion is provided with an incident surface and an emergent surface, a light supplementing piece is arranged on the light emergent side of the backlight plate and corresponds to the incident surface, and the emergent surface faces towards the preset gap. The light-emitting side through at the board in a poor light sets up the light supplementation spare, and the center has the light guide part, and the incident plane and the light supplementation spare of light guide part correspond the setting, and the emergent plane corresponds the setting with predetermineeing the clearance to in the light that the light supplementation spare sent can directly get into the expansion space through the light guide part, and need not to arrange the light supplementation spare in the expansion space, simple structure, light-emitting component's the number of piles is few, and the power supply line is simple.
The backlight module, the brightness control method thereof and the display device provided by the embodiments of the present application are described below with reference to the accompanying drawings.
First embodiment
Referring to fig. 1-7, a backlight module 100 includes a backlight plate 10, a middle frame 20, a reflective sheet 40, a light guide plate 32, a light emitting device, a diffuser plate 50, and an optical film assembly 60.
The backlight plate 10 comprises a backlight plate 10 main body and an enclosing baffle plate 12, the enclosing baffle plate 12 is enclosed on the periphery of the backlight plate 10 main body, and the middle frame 20 is enclosed on the periphery of the enclosing baffle plate 12 and forms a cavity.
Specifically, light emitting component is lamp plate 31, lamp plate 31 with light supplement 70 all locates the light-emitting side of board 10 in a poor light, just light supplement 70 is located lamp plate 31 periphery.
It should be understood that light supplement piece 70 can be a frame structure, and this frame structure can be arranged around the whole periphery of lamp plate 31, or light supplement piece 70 can also be a unilateral structure, and light supplement piece 70 is arranged around the periphery of one side of lamp plate 31, or light supplement piece 70 can also be a right-angled edge structure, and light supplement piece 70 is arranged around the periphery of two adjacent sides of lamp plate 31, or light supplement piece 70 can also be a three-angled edge structure, and light supplement piece 70 is arranged around the periphery of three sides of lamp plate 31 that connect gradually. Thus, the light supplement member 70 may have a single-sided structure or a multi-sided structure, as long as the orthographic projection of the light supplement member 70 on the backlight 10 is located on the periphery of the orthographic projection of the lamp panel 31 on the backlight 10.
Specifically, this light filling spare 70 can be miniLED lamp strip, sets up miniLED lamp strip promptly in the periphery of lamp plate 31, and lamp plate 31 can be lamp plate 31 that the LED lamp is constituteed or lamp plate 31 that the miniLED lamp is constituteed.
In some embodiments, the incident surface and the exit surface are disposed parallel to each other, and a front projection of the incident surface onto the backlight 10 at least partially overlaps with a front projection of the exit surface onto the backlight 10. The incident surface and the emergent surface of the light guide part 22 are parallel to each other, and orthographic projections of the incident surface and the emergent surface on the backlight board 10 main body are at least partially overlapped, so that the light guide part 22 between the incident surface and the emergent surface is obliquely arranged, the inclination angle is 60-90 degrees, the slope between the incident surface and the emergent surface cannot be too small, when light is emitted from the incident surface to the emergent surface, the light cannot be continuously reflected in the light guide part 22, the light loss is caused, the light emitting efficiency is improved, the light supplementing effect is further enhanced, and the peripheral shadow problem of the display device is solved.
As shown in fig. 4, the light guide part 22 further includes a reflection surface 221 located between the incident surface and the exit surface, and the reflection surface 221 is disposed toward the inside of the backlight module 100. The reflecting surface 221 is used for reflecting the light emitted from the light guide portion 22 into the backlight module 100 back into the light guide portion 22, so as to emit the light from the emitting surface, thereby increasing the light guide reflection efficiency.
Specifically, the reflection surface 221 may be white, black or gray, and when it is white, it may be a total reflection surface 221, which reflects all the light rays back into the light guide portion 22, and increases the brightness in the backlight module 100, and when it is black or gray, it may absorb some light rays, so that the brightness of the light rays is uniform, thereby adjusting the uniformity of the brightness at the edge of the backlight module 100.
With continued reference to fig. 3 and 4, in other embodiments, the middle frame 20 further includes a reflection portion 23, and the reflection portion 23 is located on a side of the light guide portion 22 facing away from the reflection surface 221. The light guide part 22 is located between the reflection part 23 and the reflection surface 221, so that light emitted from the light guide part 22 to the outside can also be reflected back into the light guide part 22 through the reflection part 23, thereby improving the brightness of the edge to increase the light guide reflection efficiency.
Specifically, the reflection portion 23 includes a black reflection portion 23 and a white reflection portion 23, the black reflection portion 23 is attached to a side of the white reflection portion 23 away from the light guide portion 22, so that all the light emitted from the light guide portion 22 is reflected back to the light guide portion 22 by the white reflection portion 23, the in-plane brightness of the backlight module 100 is increased, and the black reflection portion 23 absorbs part of the light to make the brightness of the light uniform at each position, thereby adjusting the uniformity of the edge brightness of the backlight module 100.
In addition, this center 20 still includes the center 20 main part, and this center 20 main part is the shape of falling U, and center 20 main part is hung and is established at the apron 12 top to enclose center 20 outside enclosing apron 12.
With reference to fig. 2 to 4, in an embodiment of the present application, the light guide portion 22 and the reflection portion 23 are of a split structure, and the main body of the middle frame 20, the light guide portion 22 and the reflection portion 23 are respectively formed by injection molding and are bonded by heat to form the middle frame 20, so that the material consumption is reduced and the weight is lighter.
As shown in fig. 5 and fig. 7, in another embodiment of the present application, the light guide portion 22 and the reflection portion 23 are an integrated structure, the main body of the middle frame 20, the light guide portion 22 and the reflection portion 23 are respectively formed by injection molding, and the middle frame 20 is formed by thermal bonding, and the light guide portion 22 and the reflection portion 23 are bonded together, so that the middle frame 20 has high overall strength and a simple structure.
In another embodiment, please continue to refer to fig. 6, because the sizes of the conventional lamp panel 31 and the diffuser 50 are the same, the lamp beads 311 on the lamp panel 31 are distributed over the whole lamp panel 31 in an array manner, and the light-emitting range of each lamp bead 311 is a sector, which is easy to generate light leakage around the display panel. This embodiment has changed the overall arrangement of lamp pearl 311 on lamp plate 31, arranges lamp pearl 311 near the center of lamp plate 31 to arrange light supplement piece 70 in lamp plate 31 periphery, make light supplement piece 70 surround lamp pearl 311, under the state that light supplement piece 70 was not opened, the lamp pearl 311 that is located the most marginal area sends sectorial light and can not surpass the coverage area of diffuser plate 50 yet, thereby improve the problem of display panel 200 light leak all around greatly.
Further, an auxiliary light-compensating part 70 is disposed in the gap, and the auxiliary light-compensating part 70 includes: the auxiliary light supplement member 70 is used for further supplementing light to the gap position of the diffusion plate 50, so as to improve the display uniformity of the display device.
As an example, the material of the middle frame 20 is a deformable material with a buffering performance, specifically, expanded polypropylene (EPP), Expanded Polyethylene (EPE), Expanded Polystyrene (EPS), or the like, and the material of the middle frame 20 is not limited herein, and the middle frame 20 made of the material with the buffering performance can better protect the diffuser plate 50 during assembly and use.
In other embodiments, the optical film set 60 is disposed on the light-emitting side of the diffuser plate 50, and the optical film set 60 includes a plurality of stacked optical films, and the optical films are fixedly connected to each other through a transparent optical adhesive, so as to prevent the light-emitting effect of the backlight module 100 from being affected by relative displacement between the optical films.
Specifically, the optical film may be any one of a diffusion plate 50, a prism sheet, or a protective sheet, and the optical film group 60 includes a plurality of stacked diffusion plates 50, prism sheets, or protective sheets; alternatively, the optical film sheet may be at least two of the diffusion plate 50, the prism sheet, or the protective sheet, and the optical film sheet set 60 includes at least two optical film sheets stacked together, such as the diffusion plate 50 and the prism sheet, and the protective sheet. The diffusion plate 50 is used for diffusing the light emitted by the lamp panel 31 to balance the brightness of the whole backlight module 100; the prism sheet is used to control the traveling direction of the light diffused by the diffusion plate 50 so that the traveling direction of the light is perpendicular to the display panel; the protective sheet serves to protect the prisms of the prism sheet from scratches and the like, and also serves to widen the viewing angle, which was previously narrowed by the prism sheet.
In addition, the reflector plate 40 specifically can adopt the reflection paper, pastes a whole layer of reflection paper under the lamp plate 31, and partial light is dispersed away towards display panel 200, and partial light can get back to the reflection paper, and the reflection paper reflects the partial light of absorption back to display panel 200, launches through display panel 200 to improve the light-emitting rate.
The backlight 10 may be made of a metal material, such as aluminum plate, aluminum alloy plate, or zinc-plated steel, by a process such as stamping. The metal material has good ductility, and can protect the backlight module 100 from being broken easily under the impact of external force. The backlight panel 10 may also be made of plastic materials, such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, and polyethylene, to reduce the weight of the backlight module 100 and the cost of the backlight module 100. The shape of the backlight plate 10 may be the same as that of the display panel 200 using the backlight assembly 100. For example, when the display panel 200 is rectangular, the backlight panel 10 of the backlight module 100 is also rectangular. The shape of the backlight 10 may vary from embodiment to embodiment.
Second embodiment
Referring to fig. 8 to 9, on the basis of the first embodiment, the present embodiment provides a backlight module 100, which has the same structure as that of the first embodiment, except that the light emitting component of the present embodiment is a light bar, the light bar is disposed on the inner wall of the baffle 12, a light guide plate 32 is further disposed in the cavity, and the light emitting side of the light bar is disposed opposite to any side of the light guide plate 32; the light supplementing piece 70 is arranged on the light emitting side of the backlight board 10 main body, the front projection of the light supplementing piece 70 on the backlight board 10 main body is located on the front projection periphery of the light guide board 32 on the backlight board 10, and the light supplementing piece 70 and the light bar are respectively located on different sides of the light guide board 32.
It should be understood that, in order to prevent the light bar from interfering with the light emitted from the light supplement component 70, the light bar and the light supplement component 70 are respectively located at different sides of the light guide plate 32, and since the light bar is disposed on an inner wall of the surrounding baffle 12, the light supplement component 70 may be disposed on at least one of the remaining inner walls of the surrounding baffle 12, so as to implement light supplement of the remaining side walls of the display device.
As an example, the light guide plate 32 is formed by using an optical acrylic/PC plate and then printing light guide dots on the bottom surface of the optical acrylic plate by using laser engraving, V-shaped cross grid engraving, and UV screen printing techniques, using a high-tech material having a very high refractive index and no light absorption, for uniformly diffusing light emitted from the light bar.
The Light bar includes a circuit board and a plurality of Light Emitting components disposed on the circuit board, wherein the Light Emitting components may be Light-Emitting diodes (LEDs) with conventional sizes, or Micro-LEDs or submillimeter LEDs (Mini-LEDs). The Micro-LED refers to an LED chip with the grain size of below 100 mu m, and the Mini-LED refers to an LED chip with the grain size of 100-300 mu m. The LED, the Mini-LED or the Micro-LED can be used as a self-luminous light-emitting component for display, and has the advantages of low power consumption, high brightness, high resolution, high color saturation, high reaction speed, long service life, high efficiency and the like.
In addition, the reflective sheet 40 can specifically adopt reflective paper, and a whole layer of reflective paper is pasted under the light guide plate 32, because the light bar emits the light source to the light guide plate 32, light deflects through the light guide plate 32, partial light diverges towards the display panel 200, partial light can enter the reflective paper, and the reflective paper reflects the absorbed partial light back to the light guide plate 32, thereby emitting through the liquid crystal panel, and improving the light-emitting rate.
Third embodiment
Referring to fig. 10, an embodiment of the present application provides a method for adjusting and controlling brightness of a backlight module 100, which is applied to the backlight module 100 according to the first embodiment or the second embodiment, and includes the following steps:
s001, acquiring a brightness difference threshold;
s002, obtaining a first brightness value of a preset gap between the diffuser plate 50 and the middle frame 20 and a second brightness value at other positions, and calculating a brightness difference between the first brightness value and the second brightness value;
and S003, if the brightness difference value is higher than the brightness difference threshold value, starting the light supplementing piece 70 to supplement light.
In this embodiment, by providing the luminance sensor, luminance detection is performed on the position of the preset gap, and the detected luminance is compared with the normal luminance detected in other regions, if the luminance difference value is within the luminance difference threshold range, the light supplement member 70 is not started, and if the luminance difference value is not within the luminance difference threshold, the light supplement member 70 is started to supplement light.
Fourth embodiment
Referring to fig. 1, fig. 2, fig. 4, fig. 6 and fig. 7, on the basis of any one of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, the present embodiment provides a display device, including: a display panel 200; the backlight module 100 of the first embodiment is disposed on the backlight side of the display panel 200, and the backlight module 100 is used for providing a light source to the display panel 200.
The periphery of the display panel 200 may be directly adhered to the backlight module 100 by using a foam adhesive, the foam adhesive is a double-sided adhesive, and the display panel 200 is made of liquid crystal glass.
Taking the display panel 200 as an example of the liquid crystal display panel 200, the display panel includes a lower polarizer 201, a thin film transistor 202 (TFT), a capacitor 203 (CF), and an upper polarizer 204 sequentially disposed on the light-emitting side of the backlight module 100.
In addition, the backlight module further includes a front frame 300, the front frame 300 surrounds the backlight module 100 and the liquid crystal display panel 200, and the front frame 300 is fastened to the light-emitting side of the upper polarizer 204.
The liquid crystal display panel 200 may be a single liquid crystal display panel 200 or may be two liquid crystal display panels 200 stacked in the thickness direction. When the lcd panel 200 is a dual lcd panel 200, the lcd panel 200 at the bottom layer is used for controlling light, and the lcd panel 200 at the top layer is used for displaying, so that the contrast of the display device can be improved.
It can be understood that the backlight module according to the embodiments of the present disclosure can be widely applied to provide light sources for various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, and MVA (Multi-Domain Vertical Alignment) display panels. It should be readily understood that "on … …", "above … …" and "above … …" in this application should be interpreted in its broadest sense such that "on … …" means not only "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above … …" or "above … …" includes not only the meaning of "above something" or "above" but also includes the meaning of "above something" or "above" without intervening features or layers therebetween (i.e., directly on something).
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A backlight module comprises a backlight plate, a middle frame, a light emitting component and a diffusion plate, wherein the middle frame surrounds the periphery of the backlight plate to form a cavity, the light emitting component and the diffusion plate are both positioned in the cavity, the diffusion plate is positioned at one side of the middle frame, which is far away from the light emitting component, a preset gap is arranged between the diffusion plate and the middle frame, and the backlight module is characterized in that,
the middle frame comprises a light guide part extending into the cavity, the light guide part is provided with an incident surface and an emergent surface, a light supplementing piece is arranged on the light emergent side of the backlight plate and corresponds to the incident surface, and the emergent surface faces the preset gap.
2. The backlight module according to claim 1, wherein the incident surface and the exit surface are parallel to each other, and a front projection of the incident surface onto the backlight plate at least partially overlaps with a front projection of the exit surface onto the backlight plate.
3. The backlight module as claimed in claim 2, wherein the light guide part further comprises a reflective surface disposed between the incident surface and the exit surface, and the reflective surface faces the inside of the backlight module.
4. The backlight module according to claim 1, wherein the middle frame further comprises a reflection part, and the reflection part is located on a side of the light guide part facing away from the reflection surface.
5. The backlight module as claimed in claim 4, wherein the light guide part and the reflection part are integrally formed.
6. The backlight module as claimed in claim 1, wherein an auxiliary light supplement member is disposed in the gap, the auxiliary light supplement member comprising: any one of the light reflecting sheet, the photoluminescent layer and the light condensing member.
7. The backlight module according to claim 1, wherein the light emitting element is a lamp panel, the lamp panel and the light compensating element are both disposed on a light emitting side of the backlight panel, and the light compensating element is disposed on a periphery of the lamp panel.
8. The backlight module of claim 1, wherein the light emitting elements are light bars disposed on the side walls of the backlight plate, a light guide plate is further disposed in the cavity, and the light emitting sides of the light bars are disposed opposite to any side of the light guide plate;
the light supplementing piece is arranged on the light emitting side of the backlight plate, the front projection of the backlight plate is located on the periphery of the front projection of the backlight plate, and the light supplementing piece and the light bar are respectively located on different sides of the light guide plate.
9. A method for adjusting and controlling the brightness of a backlight module, applied to the backlight module according to any one of claims 1 to 8, comprising the steps of:
acquiring a brightness difference threshold;
acquiring a first brightness value of a preset gap between the diffusion plate and the middle frame and a second brightness value of other positions, and calculating a brightness difference value between the first brightness value and the second brightness value;
and if the brightness difference value is higher than the brightness difference threshold value, starting a light supplementing piece to supplement light.
10. A display device, comprising:
a display panel; and
the backlight module according to any of claims 1-9, disposed on a backlight side of the display panel, the backlight module configured to provide a light source to the display panel.
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| CN202211047555.2A CN115128871A (en) | 2022-08-30 | 2022-08-30 | Backlight module, brightness control method thereof and display device |
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| CN202211047555.2A CN115128871A (en) | 2022-08-30 | 2022-08-30 | Backlight module, brightness control method thereof and display device |
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Application publication date: 20220930 |