CN111458911B - Display device and light source module thereof - Google Patents
Display device and light source module thereof Download PDFInfo
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- CN111458911B CN111458911B CN201910048166.3A CN201910048166A CN111458911B CN 111458911 B CN111458911 B CN 111458911B CN 201910048166 A CN201910048166 A CN 201910048166A CN 111458911 B CN111458911 B CN 111458911B
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- 238000005286 illumination Methods 0.000 claims abstract description 79
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 63
- 230000000007 visual effect Effects 0.000 claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000004988 Nematic liquid crystal Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 14
- 239000011521 glass Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000010287 polarization Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
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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
- G02F1/1323—Arrangements for providing a switchable viewing angle
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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
- G02F1/133528—Polarisers
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a display device and a light source module thereof. The light source module comprises a backlight module and a light-emitting visual angle control device. The light-emitting visual angle control device is arranged on the backlight module. In the light-emitting visual angle control device, a first polaroid, a first alignment layer, a first liquid crystal layer, a second alignment layer and a second polaroid are sequentially arranged on a transmission path of an illumination beam from a backlight module. The first alignment layer is perpendicular to the alignment direction of the second alignment layer. The plurality of liquid crystal molecules in the first liquid crystal layer change their alignment direction according to the first applied voltage. When the first applied voltage is equal to 0V, the light-emitting visual angle range of the illumination light beam is a first visual angle, and when the first applied voltage is greater than 0V, the light-emitting visual angle range is a second visual angle, wherein the second visual angle is different from the first visual angle. The display device comprises the light source module. The display device and the light source module can be switched between a forward ornamental mode and an oblique peep-proof mode.
Description
Technical Field
The present invention relates to a display device, and more particularly, to a display device and a light source module capable of controlling a Viewing Angle.
Background
With the development of technology, display devices have become popular electronic devices. A wide viewing angle is required for a typical display device, however, some displays require a control of the viewing angle range to provide a peep-proof function. For example, when the automobile is traveling, the light of the display device for the automobile may cause interference to the driver or distraction to the driver from the display content, but when the automobile is not traveling, the driver still wants to be able to view the display content of the display device for the automobile. Therefore, how to provide a display device capable of controlling the viewing angle range is a subject to be studied.
The background section is only for the purpose of aiding in the understanding of the present invention and thus the disclosure of the background section may include some of the known art that does not form part of the understanding of those skilled in the art. The disclosure of the "background" section is not intended to represent the subject matter disclosed as one or more embodiments of the present invention, which may be known or appreciated by those skilled in the art prior to the application of the present invention.
Disclosure of Invention
The embodiment of the invention provides a display device and a light source module, which can provide at least two different visual angle ranges.
Other objects and advantages of the present invention will be further appreciated from the technical features disclosed in the present invention.
To achieve one or a part or all of the above or other objects, an embodiment of the invention provides a light source module. The light source module comprises a backlight module and a light-emitting visual angle control device. The backlight module is used for emitting illumination light beams. The light-emitting visual angle control device is arranged on the backlight module along the transmission direction of the illumination light beam and comprises a plurality of polaroids, a plurality of alignment layers and a liquid crystal layer. The first polarizer and the second polarizer are sequentially arranged on the transmission path of the illumination beam. The first liquid crystal layer is arranged on the transmission path of the illumination beam and is positioned between the first polaroid and the second polaroid, wherein a plurality of liquid crystal molecules in the first liquid crystal layer change the arrangement direction according to the first applied voltage. The first alignment layer is disposed on the transmission path of the illumination beam and between the first polarizer and the first liquid crystal layer. The second alignment layer is disposed on the transmission path of the illumination beam and between the second polarizer and the first liquid crystal layer, wherein the first alignment layer is perpendicular to the alignment direction of the second alignment layer. When the first applied voltage is equal to 0V (volt), the light-emitting visual angle range after the illumination light beam passes through the light-emitting visual angle control device is a first visual angle, and when the first applied voltage is greater than 0V, the light-emitting visual angle range is a second visual angle, wherein the second visual angle is different from the first visual angle.
An embodiment of the invention provides a display device. The display device comprises a light source module and a display module. The light source module comprises a backlight module and a light-emitting visual angle control device. The backlight module is used for emitting illumination light beams. The emergent view angle control device is arranged on the backlight module along the transmission direction of the illumination light beam. In the light-emitting visual angle control device, a first polarizer and a second polarizer are sequentially arranged on a transmission path of an illumination beam. The first liquid crystal layer is arranged on the transmission path of the illumination beam and is positioned between the first polaroid and the second polaroid, wherein a plurality of liquid crystal molecules in the first liquid crystal layer change the arrangement direction according to the first applied voltage. The first alignment layer is disposed on the transmission path of the illumination beam and between the first polarizer and the first liquid crystal layer. The second alignment layer is configured on the transmission path of the illumination light beam and is positioned between the second polaroid and the first liquid crystal layer, wherein the first alignment layer is vertical to the alignment direction of the second alignment layer, the light-emitting visual angle range after the illumination light beam passes through the light-emitting visual angle control device is a first visual angle when the first applied voltage is equal to 0V, and the light-emitting visual angle range is a second visual angle when the first applied voltage is greater than 0V, wherein the second visual angle is different from the first visual angle. The display module is configured on the light source module along the transmission direction of the illumination light beam and is used for converting the illumination light beam into a display light beam.
Based on the above, the display device and the light source module thereof according to the embodiments of the present invention have at least two viewing modes with different viewing angles, including a forward viewing angle mode for viewing by multiple persons together and an oblique peep-preventing mode for limiting the viewing of a viewer in a specific direction. If the display device is applied to a vehicle screen, when a vehicle runs, the display device is switched to an oblique peep-proof mode, so that interference to a driver can be avoided, the running safety is improved, and meanwhile, a passenger on the auxiliary seat can still watch the display content of the display device.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram of a display device according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a light source module according to an embodiment of the present invention.
Fig. 3A is a schematic diagram illustrating an alignment direction and a viewing angle control direction of an alignment layer of an illumination viewing angle control device according to an embodiment of the invention.
Fig. 3B is a schematic diagram illustrating an alignment direction and a viewing angle control direction of an alignment layer of an illumination viewing angle control device according to another embodiment of the present invention.
Fig. 4A to 4D are light-emitting field distribution diagrams of the light-emitting viewing angle control device according to the embodiment of fig. 3A.
Fig. 5 is a light-emitting field distribution diagram of the light-emitting viewing angle control device according to the embodiment of fig. 4A to 4D in the horizontal viewing direction.
Fig. 6 is a schematic structural view of a light source module according to another embodiment of the present invention.
Fig. 7A and fig. 7B are schematic views illustrating an alignment direction and a viewing angle control direction of an alignment layer of an illumination viewing angle control device according to another embodiment of the invention.
Fig. 8 is a light-emitting field distribution diagram of a light-emitting viewing angle control device in a horizontal viewing direction according to the embodiment of fig. 6 to 7B.
Fig. 9 is a light-emitting field profile of a light-emitting viewing angle control device in a horizontal viewing direction according to another embodiment of the present invention.
Fig. 10 is a schematic diagram of a display device according to another embodiment of the present invention.
Detailed Description
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiment, which proceeds with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention.
Figure 1 is a simplified schematic diagram of a display device according to one embodiment of the present invention,
fig. 2 is a schematic structural view of a light source module according to an embodiment of the present invention. Referring to fig. 1, a display device 10 includes a light source module 100 and a display module 200. The light source module 100 includes a backlight module 110 and a light-emitting viewing angle control device 120. The backlight module 110 is configured to emit an illumination beam IB, and the light-emitting viewing angle control device 120 is disposed on the backlight module 110 along a transmission direction (e.g. a Z direction) of the illumination beam IB, so as to adjust a light-emitting viewing angle of the illumination beam IB. The display module 200 is disposed on the light source module 100 along a transmission direction (e.g. Z direction) of the illumination beam IB, and is used for converting the illumination beam IB into a display beam DB.
Referring next to fig. 2, fig. 2 schematically shows the architecture of the light source module 100. The light-emitting viewing angle control device 120 at least includes a first polarizer 122, a second polarizer 124, a first LC layer LC1, a first alignment layer 126 and a second alignment layer 128. The first polarizer 122 and the second polarizer 124 are sequentially disposed on the transmission path of the illumination beam IB. The first liquid crystal layer LC1 is disposed on the transmission path of the illumination beam IB and between the first polarizer 122 and the second polarizer 124. The first alignment layer 126 is disposed on the transmission path of the illumination beam IB and between the first polarizer 122 and the first liquid crystal layer LC1, the second alignment layer 128 is disposed on the transmission path of the illumination beam IB and between the second polarizer 124 and the first liquid crystal layer LC1, and the alignment direction of the first alignment layer 126 is perpendicular to the alignment direction of the second alignment layer 128. In addition, the first polarizer 122 and the first alignment layer 126 are separated by the glass layer GL1 and the conductive layer CL1, and the second polarizer 124 and the second alignment layer 128 are separated by the glass layer GL2 and the conductive layer CL2.
The plurality of liquid crystal molecules in the first liquid crystal layer LC1 change their alignment direction according to the first applied voltage. When the first applied voltage is equal to 0V (volt), the light emitting viewing angle range of the illumination beam IB after penetrating the light emitting viewing angle control device 120 is a first viewing angle, and when the first applied voltage is greater than 0V, the light emitting viewing angle range is a second viewing angle, wherein the second viewing angle is different from the first viewing angle.
In short, in the present embodiment, the light-emitting viewing angle control device 120 can change the light-emitting viewing angle of the illumination beam IB from the backlight module 110. The alignment direction of the liquid crystal molecules of the first liquid crystal layer LC1 is changed by controlling the magnitude of the first applied voltage, so as to adjust the light-emitting viewing angle range of the illumination light beam IB passing through the light-emitting viewing angle control device 120. Thus, after the illumination beam IB passes through the display module 200, at least two different viewing angle ranges (e.g., a first viewing angle and a second viewing angle) can be provided.
The remaining embodiments of the light emission viewing angle control device 120 are further described below.
In the present embodiment, the liquid crystal molecules of the first liquid crystal layer LC1 are Twisted Nematic (TN) liquid crystals, but are not limited thereto.
In the present embodiment, after the first voltage is applied, the light-emitting viewing angle range is shifted, and the shift direction is determined based on the alignment directions of the first alignment layer 126 and the second alignment layer 128. The absorption axis direction of the first polarizer 122 may be parallel or perpendicular to the alignment direction of the first alignment layer 126, and the absorption axis direction of the second polarizer 124 may be parallel or perpendicular to the alignment direction of the second alignment layer 128.
In this embodiment, the angle between the alignment direction of the first alignment layer 126 and the alignment direction of the second alignment layer 128 is, for example, 90 degrees. When the first applied voltage is equal to 0V, the light emitting angle (first angle) of the illumination beam IB after penetrating the light emitting angle control device 120 remains substantially unchanged, but when the first applied voltage is greater than 0V, the liquid crystal molecules begin to deflect, the light emitting angle range of the illumination beam IB changes from the first angle to the second angle, and the offset direction thereof forms an angle of 45 degrees with the alignment direction of the second alignment layer.
Fig. 3A is a schematic diagram illustrating an alignment direction and a viewing angle control direction of an alignment layer of an illumination viewing angle control device according to an embodiment of the invention. Referring to fig. 2 and 3A, on the plane of the first liquid crystal layer LC1 (for example, the X-Y plane), the horizontal viewing direction is defined as the X direction, and the vertical viewing direction is defined as the Y direction. The embodiment of fig. 3A is applicable to the light-emitting viewing angle control device 120, where the alignment direction 1261 of the first alignment layer 126 is 135 degrees with respect to the horizontal viewing line, and the alignment direction 1281 of the second alignment layer 128 is 45 degrees with respect to the horizontal viewing line, and the alignment direction 1261 of the first alignment layer 126 is 90 degrees with respect to the alignment direction 1281 of the second alignment layer 128.
Fig. 4A to 4D are light-emitting field pattern distribution diagrams of the light-emitting viewing angle control device according to the embodiment of fig. 3A, and fig. 5 is a light-emitting field pattern distribution diagram of the light-emitting viewing angle control device according to the embodiment of fig. 4A to 4D in a horizontal viewing direction. In fig. 4A, the first applied voltage is 0V (volt), and in fig. 4B to 4D, the first applied voltage is 1.6V, 1.8V, and 2V, respectively. Curves 510 to 540 in fig. 5 show the variation of the light exit field pattern of fig. 4A to 4D, respectively, in the horizontal viewing direction.
In the present embodiment, the backlight module 110 is exemplified by Lambertian light source (Lambertian), the polarization direction of the first polarizer 122 is perpendicular to the alignment direction 1261 of the first alignment layer 126, and the polarization direction of the second polarizer 124 is also perpendicular to the alignment direction 1281 of the second alignment layer 128. Before the first voltage is applied to the first liquid crystal layer LC1 (see curve 510 of fig. 4A and fig. 5), the liquid crystal molecules maintain the original arrangement mode, the first viewing angle of the illumination beam IB passing through the light-emitting viewing angle control device 120 maintains a wide viewing angle range, and the display device 10 operates in the forward viewing mode, so that viewers at different positions can view the picture together.
As the first applied voltage increases (see fig. 4B to 5), the light output field of the illumination beam IB passing through the light output viewing angle control device 120 changes, the viewing angle range becomes narrower and the viewing angle is shifted toward the horizontal viewing direction (e.g., right in fig. 4B to 5), referring to the shift direction 130 of the light output viewing angle range in fig. 3A. That is, the alignment direction 1261 of the first alignment layer 126 and the alignment direction 1281 of the second alignment layer 128 form an angle of 90 degrees, and as the first applied voltage increases, the offset direction 130 of the illumination beam IB from the first viewing angle to the second viewing angle forms an angle of 45 degrees with the alignment direction 1281 of the second alignment layer 128 after passing through the light-emitting viewing angle control device 120. Further, as can be seen from fig. 4A to 4D, the range of the first viewing angle may be larger than the range of the second viewing angle, and the ranges of the positive and negative angles of the second viewing angle in fig. 4B to 4D are significantly asymmetric. More specifically, the first viewing angle includes a viewing angle range of 60 degrees to-60 degrees, and the second viewing angle is a viewing angle range of greater than or equal to-30 degrees or less than or equal to 30 degrees.
That is, increasing the first applied voltage causes the range of the light-emitting viewing angle to be limited in a specific direction, particularly in an oblique direction, so that the display device 10 can operate in the oblique peep-proof mode, and only viewers in the specific direction can view the image to achieve the peep-proof effect.
In short, the first viewing angle is suitable for the forward viewing mode, the second viewing angle is suitable for the oblique viewing mode, and the offset direction from the first viewing angle to the second viewing angle is determined according to the alignment direction between the first alignment layer 126 and the second alignment layer 128. The first applied voltage controls the light-emitting viewing angle control device 120 to switch the display device 10 between the forward viewing mode and the oblique peep-preventing mode.
In one embodiment, the embodiment of fig. 3A to 4D is applied to a central control display device of an automobile. When the automobile does not travel, the display device 10 operates in a forward viewing mode, and at the moment, a driver on the driver seat and a passenger on the auxiliary seat can watch the picture of the display device 10 together, but when the automobile travels, the display device 10 can switch to an oblique peep-proof mode, and the visual angle range of the display device 10 is changed to only provide the viewing of the passenger on the auxiliary seat, and the driver cannot see the picture of the display device 10, so that the effect of improving the driving safety is achieved.
Fig. 3B is a schematic diagram illustrating an alignment direction and a viewing angle control direction of an alignment layer of an illumination viewing angle control device according to another embodiment of the present invention. Referring to fig. 3B, the alignment direction 1262 of the first alignment layer 126 is 45 degrees with respect to the horizontal line of sight, and the alignment direction 1282 of the second alignment layer 128 is 135 degrees with respect to the horizontal line of sight, and the alignment direction 1262 of the first alignment layer 126 and the alignment direction 1282 of the second alignment layer 128 are also at an angle of 90 degrees. In this embodiment, the offset direction 140 of the light emitting viewing angle range from the first viewing angle to the second viewing angle is offset to the left, which is opposite to the offset direction 130 in fig. 3A, but the offset direction 140 is also 45 degrees from the alignment direction 1282 of the second alignment layer 128.
The embodiment of fig. 3B may obtain enough teaching, suggestion and implementation from the descriptions of fig. 3A and fig. 4A to 5, and thus will not be repeated.
Fig. 6 is a schematic structural view of a light source module according to another embodiment of the present invention. The light source module 300 of fig. 6 may be applied to the display device 10 of fig. 1. The light source module 300 is partially similar to the light source module 100 of fig. 2, but the light-emitting viewing angle control device 310 of the light source module 300 further includes a second liquid crystal layer LC2, a third alignment layer 312, a fourth alignment layer 314, and a third polarizer 316.
The third polarizer 316 is disposed on the second polarizer 124 along the transmission direction of the illumination beam IB. The second liquid crystal layer LC2 is disposed on the transmission path of the illumination beam IB and between the third polarizer 316 and the second polarizer 124. The third alignment layer 312 is disposed on the transmission path of the illumination beam IB and between the second polarizer 124 and the second liquid crystal layer LC 2. The fourth alignment layer 314 is disposed on the transmission path of the illumination beam IB and between the third polarizer 316 and the second liquid crystal layer LC2, wherein the third alignment layer 312 is perpendicular to the alignment direction of the fourth alignment layer 314. The alignment layer of the light-emitting viewing angle control device 310 is equally spaced from the polarizer by a glass layer and a conductive layer. For example, in addition to the original glass layers GL1 and GL2 and the conductive layers CL1 and CL2, the second polarizer 124 and the third alignment layer 312 are separated by the glass layer GL3 and the conductive layer CL3, and the third polarizer 316 and the fourth alignment layer 314 are separated by the glass layer GL4 and the conductive layer CL4.
The plurality of liquid crystal molecules in the second liquid crystal layer LC2 change their alignment direction according to the second applied voltage. When the first applied voltage and the second applied voltage are both equal to 0V, the light emitting angle of the illumination beam IB is the first angle. When the first applied voltage and the second applied voltage are both greater than 0V, the light-emitting view angle is a third view angle, wherein the first view angle, the second view angle and the third view angle are different from each other.
In the present embodiment, the liquid crystal molecules of the first liquid crystal layer LC1 and the second liquid crystal layer LC2 may be Twisted Nematic (TN) liquid crystals, but are not limited thereto.
Fig. 7A and fig. 7B are schematic views illustrating an alignment direction and a viewing angle control direction of an alignment layer of an illumination viewing angle control device according to another embodiment of the invention. The embodiments of fig. 7A and 7B are applicable to the light-emitting viewing angle control device 310. Fig. 7A shows the alignment direction 1263 of the first alignment layer 126 and the alignment direction 1283 of the second alignment layer 128, which are configured in the same manner as the embodiment of fig. 3A. The alignment direction 1263 of the first alignment layer 126 is 135 degrees with respect to the horizontal line of sight, and the alignment direction 1283 of the second alignment layer 128 is 45 degrees with respect to the horizontal line of sight. Fig. 7B shows the alignment direction 3121 of the third alignment layer 312 and the alignment direction 3141 of the fourth alignment layer 314. The alignment direction 3121 of the third alignment layer 312 is 225 degrees with respect to the horizontal line of sight, 180 degrees different from the alignment direction 1263 of the second alignment layer 126. The alignment direction 3141 of the fourth alignment layer 314 is 315 degrees with respect to the horizontal line of sight, and also 180 degrees different from the alignment direction 1263 of the first alignment layer 126. In this configuration, the shift direction of the light emitting viewing angle range of the illumination light beam IB emitted from the light source module 300 is shifted rightward, as indicated by the arrow 320.
Fig. 8 is a light-emitting field distribution diagram of a light-emitting viewing angle control device in a horizontal viewing direction according to the embodiment of fig. 6 to 7B. The backlight module 110 is also a lambertian light source. Curve 810 shows the light output pattern generated by the first and second voltages equal to 0V, which is the intensity distribution of the first viewing angle in the horizontal viewing direction. Curve 820 shows the light-emitting field pattern generated by the first and second voltages not equal to 0V, which is the intensity distribution of the third viewing angle in the horizontal viewing direction. In the embodiment represented by curve 820, the first applied voltage is 2V and the second applied voltage is 1.8V. The first applied voltage will be greater than the second applied voltage.
It is specifically noted that the first applied voltage and the second applied voltage may be smaller than the voltage applied to the liquid crystal layer in the display module 200. For example, the voltage required for completely turning the molecules in the liquid crystal layer in the display module 200 may be between 2.5V and 3.3V, which is greater than the first applied voltage and the second applied voltage.
The first and second liquid crystal layers LC1 and LC2 are controlled by increasing the first and second applied voltages, respectively, so that the illumination beam IB emitted from the backlight module 110 generates a third viewing angle after passing through the light-emitting viewing angle control device 310. The range of the third viewing angle is smaller than the range of the second viewing angle and the first viewing angle. In the above embodiment, the arrangement of the liquid crystal molecules in the first liquid crystal layer LC1 is changed by the first applied voltage to achieve the peep-proof effect of providing the viewing image of the viewer at the oblique position (refer to fig. 5), however, the configuration of the second liquid crystal layer LC2 is added to further suppress the emergent light field beyond the viewing direction. For example, the curve 810 in fig. 8 corresponds to a forward viewing mode with a left-right symmetric viewing effect, the curve 820 corresponds to an oblique peep-proof mode, and is suitable for viewing by viewers in a horizontal direction greater than-30 degrees, and the light output of the illumination beam IB is significantly suppressed in a range less than-30 degrees, so as to achieve a better peep-proof effect.
Fig. 9 is a light-emitting field profile of a light-emitting viewing angle control device in a horizontal viewing direction according to another embodiment of the present invention. In the present embodiment, the backlight module 110 in the light source module 300 is changed to an existing light source for a vehicle. Curve 910 is the light-emitting field type in the forward viewing mode, i.e. the first applied voltage and the second applied voltage are 0V. Curve 920 is the light-out field type in the oblique peep-proof mode, i.e. the first applied voltage and the second applied voltage are both greater than 0V. In the forward viewing mode, viewers located on both sides of the display device 10 can see the picture, but in the oblique peep-proof mode, viewers located on the right side (viewing angle is greater than 0 degrees) can see the picture, and viewers located on the left side (viewing angle is less than 0 degrees), especially viewers located at viewing angles less than-35 degrees, cannot see the picture, which means that this embodiment can provide two viewing modes with different viewing angle ranges, wherein one viewing mode has a good peep-proof effect.
Fig. 10 is a schematic diagram of a display device according to another embodiment of the present invention. The display device 20 includes a display module 210 and a light source module 340. The light source module 340 emits an illumination beam IB, and the display module 210 is disposed on the light source module 340 along a transmission direction of the illumination beam IB for converting the illumination beam IB into a display beam DB. The architecture of the light source module 340 is substantially similar to the light source module 300 described above, as will be further described below. The display module 210 includes a fourth polarizer 220, a display layer 230, and a fifth polarizer 240. The fourth polarizer 220 and the fifth polarizer 240 are sequentially disposed on the transmission path of the illumination beam IB, and the display layer 230 is disposed on the transmission path of the illumination beam IB and between the fourth polarizer 220 and the fifth polarizer 230. The display module 210 is adapted to fit the light source module of each of the above embodiments.
Specifically, the light source module 340 may have the same structure as the light source module 300, and the light source module 340 also includes the third polarizer 334. The third polarizer 334 is disposed between the second polarizer 124 and the fourth polarizer 220 along the transmission direction of the illumination beam IB, wherein the absorption axis direction of the third polarizer 334 is parallel or perpendicular to the alignment direction of the fourth alignment layer 314. However, in one embodiment, the third polarizer 334 is not necessary, and the fourth polarizer 220 may replace the third polarizer 334.
In addition, in the present embodiment, the display device 20 may further include an optical phase retardation layer 332. The optical retardation layer 332 is disposed on the transmission path of the illumination beam IB and between the fourth alignment layer 314 and the fourth polarizer 220. The display module 210 may be an In-Plane Switching (IPS) panel. If the polarization direction of the fourth polarizer 220 of the display module 210 is inconsistent with the illumination beam IB from the light source module 340, the optical retardation layer 332 can correct the polarization direction of the illumination beam IB so as to make the illumination beam IB enter the display module 210 smoothly. The optical phase retardation layer 332 is, for example, a half wave plate, but is not limited thereto.
In summary, exemplary embodiments of the invention provide a display device and a light source module. The light source module is provided with a light-emitting visual angle control device, and the light-emitting visual angle control device adjusts the light-emitting field type of the illumination light beam by changing the arrangement mode of liquid crystal molecules in the first liquid crystal layer, so that the display device can be switched between a forward ornamental mode and an oblique peep-proof mode. In the forward viewing mode, the viewing angle of the display device is substantially similar to the viewing angle range provided by the backlight module. By controlling the first applied voltage, the visual angle range of the oblique peep-proof mode is also changed along with the first applied voltage so as to meet the requirements of different angles. The display device and the light source module can provide a peep-proof mode with low power and high brightness.
However, the foregoing is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims and their equivalents as filed in light of the foregoing disclosure. Not all of the objects, advantages, or features of the present disclosure are required to be achieved by any one embodiment or claim of the present disclosure. Furthermore, the abstract and the title of the invention are provided solely for the purpose of assisting patent document retrieval and are not intended to limit the scope of the claims. Furthermore, references to "first," "second," etc. in this specification or in the claims are only intended to name or distinguish between different embodiments or ranges of the element, and are not intended to limit the upper or lower limit on the number of elements.
Reference numerals illustrate:
10. 20: display device
100. 300, 340: light source module
110: backlight module
120. 310, 330: light-emitting visual angle control device
122: first polarizer
124: second polarizer
126: a first alignment layer
1261. 1281, 1262, 1282, 1263, 1283, 3121, 3141: alignment direction
128: a second alignment layer
130. 140, 320: direction of deviation
200. 210: display module
220: fourth polarizer
230: display layer
240: fifth polarizer
312: third alignment layer
314: fourth alignment layer
316. 334, 334: third polarizer
332: optical phase retardation layer
510-540, 810, 820, 910, 920: curve of curve
DB: display beam
IB: illumination beam
GL1, GL2, GL3, GL4: glass layer
CL1, CL2, CL3, CL4: conductive layer
LC1: first liquid crystal layer
LC2: second liquid crystal layer
X, Y, Z: direction.
Claims (10)
1. A display device comprising a light source module, an optical phase retardation layer, and a display module, wherein:
the light source module comprises a backlight module and a light-emitting visual angle control device, wherein:
the backlight module is used for emitting illumination light beams; and
the light-emitting visual angle control device is configured on the backlight module along the transmission direction of the illumination light beam and comprises a first polaroid, a second polaroid, a first liquid crystal layer, a first alignment layer and a second alignment layer, wherein:
the first polaroid and the second polaroid are sequentially arranged on the transmission path of the illumination light beam;
the first liquid crystal layer is configured on the transmission path of the illumination light beam and is positioned between the first polaroid and the second polaroid, wherein a plurality of liquid crystal molecules in the first liquid crystal layer change the arrangement direction according to a first applied voltage;
the first alignment layer is configured on the transmission path of the illumination light beam and is positioned between the first polarizer and the first liquid crystal layer; and
the second alignment layer is arranged on the transmission path of the illumination beam and is positioned between the second polarizer and the first liquid crystal layer, wherein the alignment direction of the first alignment layer is perpendicular to the alignment direction of the second alignment layer,
wherein when the first applied voltage is equal to 0V, the light-emitting visual angle range of the illumination light beam after penetrating through the light-emitting visual angle control device is a first visual angle, and when the first applied voltage is greater than 0V, the light-emitting visual angle range is a second visual angle,
wherein the second viewing angle is different from the first viewing angle,
wherein on the plane of the first liquid crystal layer, the alignment direction of the first alignment layer is one of 45 degrees or 135 degrees with respect to a horizontal line of sight, and the alignment direction of the second alignment layer is the other of 45 degrees or 135 degrees with respect to the horizontal line of sight, and
wherein when the first applied voltage is greater than 0V, an offset direction in which the light-exiting viewing angle range is changed from the first viewing angle to the second viewing angle is the horizontal viewing direction that is at an angle of 45 degrees to the alignment direction of the second alignment layer; and
the display module is configured on the light source module along the transmission direction of the illumination light beam, and is used for converting the illumination light beam into a display light beam, and the display module comprises:
the fourth polaroid and the fifth polaroid are sequentially arranged on the transmission path of the illumination light beam; and
the display layer is configured on the transmission path of the illumination light beam and is positioned between the fourth polaroid and the fifth polaroid;
wherein, the light-emitting visual angle control device further comprises:
a second liquid crystal layer disposed on a transmission path of the illumination beam and between the fourth polarizer and the second polarizer, wherein a plurality of liquid crystal molecules in the second liquid crystal layer change an alignment direction thereof according to a second applied voltage;
a third alignment layer disposed on the transmission path of the illumination beam and between the second polarizer and the second liquid crystal layer; and
a fourth alignment layer disposed on the transmission path of the illumination beam and between the fourth polarizer and the second liquid crystal layer, wherein the third alignment layer is perpendicular to the alignment direction of the fourth alignment layer,
wherein when the first applied voltage and the second applied voltage are both equal to 0V, the light-emitting viewing angle after the illumination beam penetrates the light-emitting viewing angle control device is the first viewing angle, and when the first applied voltage and the second applied voltage are both greater than 0V, the light-emitting viewing angle is a third viewing angle, wherein the first viewing angle, the second viewing angle and the third viewing angle are different from each other; and
the optical phase retardation layer is configured on the transmission path of the illumination beam and is positioned between the fourth alignment layer and the fourth polarizer.
2. The display device according to claim 1, wherein an absorption axis direction of the first polarizer is parallel or perpendicular to an alignment direction of the first alignment layer, and an absorption axis direction of the second polarizer is parallel or perpendicular to an alignment direction of the second alignment layer.
3. The display device according to claim 1, wherein a range of the first viewing angle is larger than a range of the second viewing angle, and a range of positive and negative angles of the second viewing angle is asymmetric.
4. The display device according to claim 1, wherein the first viewing angle includes a viewing angle range of 60 degrees to-60 degrees, and the second viewing angle is a viewing angle range of greater than or equal to-30 degrees or less than or equal to 30 degrees.
5. The display device according to claim 1, wherein the light-emitting viewing angle control device further comprises:
and the third polaroid is arranged between the second polaroid and the fourth polaroid along the transmission direction of the illumination light beam, wherein the absorption axis direction of the third polaroid is parallel or perpendicular to the alignment direction of the fourth alignment layer.
6. The display device according to claim 5, wherein an alignment direction of the second alignment layer and the third alignment layer is 180 degrees different, and an alignment direction of the first alignment layer and the fourth alignment layer is 180 degrees different.
7. The display device according to claim 5, wherein the first applied voltage is larger than the second applied voltage.
8. The display device according to claim 5, wherein a range of the third viewing angle is smaller than a range of the second viewing angle and the first viewing angle.
9. The display device according to claim 5, wherein liquid crystal molecules of the first liquid crystal layer or the second liquid crystal layer are twisted nematic liquid crystal.
10. The display device according to claim 1, wherein the first viewing angle is suitable for a forward viewing mode, the second viewing angle is suitable for an oblique viewing mode, and a direction of shift from the first viewing angle to the second viewing angle is determined according to an alignment direction between the first alignment layer and the second alignment layer.
Priority Applications (4)
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| CN201910048166.3A CN111458911B (en) | 2019-01-18 | 2019-01-18 | Display device and light source module thereof |
| TW108104117A TWI698668B (en) | 2019-01-18 | 2019-02-01 | Display apparatus and light source module thereof |
| JP2020003339A JP2020118965A (en) | 2019-01-18 | 2020-01-14 | Display device and light source module of the same |
| DE102020100790.6A DE102020100790A1 (en) | 2019-01-18 | 2020-01-15 | Display device and light source module therefor |
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| CN201910048166.3A CN111458911B (en) | 2019-01-18 | 2019-01-18 | Display device and light source module thereof |
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| CN (1) | CN111458911B (en) |
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| JP7395328B2 (en) * | 2019-11-14 | 2023-12-11 | 株式会社ジャパンディスプレイ | Vehicle display device |
| TWI737420B (en) * | 2020-07-27 | 2021-08-21 | 友達光電股份有限公司 | Display apparatus |
| US11841585B2 (en) | 2021-12-02 | 2023-12-12 | Coretronic Corporation | Display apparatus and method of driving the same |
| CN217060711U (en) | 2021-12-02 | 2022-07-26 | 中强光电股份有限公司 | Display device |
| DE102022100553A1 (en) * | 2022-01-11 | 2023-07-13 | Audi Aktiengesellschaft | display system |
| WO2023232969A1 (en) | 2022-06-03 | 2023-12-07 | Behr-Hella Thermocontrol Gmbh | Display device, in particular for a vehicle, for displaying information, having switchable sharing and private modes |
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| TWI698668B (en) | 2020-07-11 |
| DE102020100790A1 (en) | 2020-07-23 |
| JP2020118965A (en) | 2020-08-06 |
| CN111458911A (en) | 2020-07-28 |
| TW202028784A (en) | 2020-08-01 |
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