CN117389081A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN117389081A CN117389081A CN202311461268.0A CN202311461268A CN117389081A CN 117389081 A CN117389081 A CN 117389081A CN 202311461268 A CN202311461268 A CN 202311461268A CN 117389081 A CN117389081 A CN 117389081A
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- Prior art keywords
- light
- guide plate
- light guide
- backlight module
- peep
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- 230000003287 optical effect Effects 0.000 claims abstract description 74
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 8
- 244000144985 peep Species 0.000 claims description 7
- 239000011358 absorbing material Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 7
- 239000010408 film Substances 0.000 description 61
- 239000000758 substrate Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 239000012788 optical film Substances 0.000 description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000008918 voyeurism Diseases 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the application provides a backlight module and a display device, wherein the backlight module comprises: a first light guide plate; the first light source is arranged on the light inlet side of the first light guide plate; the optical peep-proof structure is arranged on the light emitting side of the first light guide plate; the second light guide plate is arranged on one side of the optical peep-proof structure, which is away from the first light guide plate; the second light source is arranged on the light inlet side of the second light guide plate; the unidirectional light transmission group is arranged between the second light guide plate and the optical peep-proof structure and is used for transmitting at least part of light rays emitted from the optical peep-proof structure and reflecting at least part of light rays emitted from the second light guide plate. According to the technical scheme, the brightness loss of the backlight module in the sharing state can be reduced, the brightness of the display device is effectively improved, the display effect is improved, the user requirements are met, and the cost is low.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display device.
Background
Currently, people have different requirements on the viewing angle of a display device in different scenes. For example, when multiple people need to watch the display screen at different angles, the display device is required to have a wide viewing angle, so that the display device is in a sharing state; when the content of the display picture needs to be kept secret, only a user can watch the display picture, the display device is required to have a narrow viewing angle, and the display device is in a peep-proof state. In the related art, the display device has low brightness and poor display effect when in a sharing state.
Disclosure of Invention
The embodiment of the application provides a backlight module and a display device, which are used for solving or relieving one or more technical problems in the prior art.
As an aspect of the embodiments of the present application, embodiments of the present application provide a backlight module, including: a first light guide plate; the first light source is arranged on the light inlet side of the first light guide plate; the optical peep-proof structure is arranged on the light emitting side of the first light guide plate; the second light guide plate is arranged on one side of the optical peep-proof structure, which is away from the first light guide plate; the second light source is arranged on the light inlet side of the second light guide plate; the unidirectional light transmission group is arranged between the second light guide plate and the optical peep-proof structure and is used for transmitting at least part of light rays emitted from the optical peep-proof structure and reflecting at least part of light rays emitted from the second light guide plate.
In one embodiment, the unidirectional light transmission group comprises a plurality of film layers, and the plurality of film layers are arranged along the arrangement direction of the second light guide plate and the optical peep-proof structure; the refractive index of the film layer arranged facing the second light guide plate is larger than that of the film layer arranged facing the optical peep-proof structure.
In one embodiment, the refractive indexes of the plurality of film layers gradually decrease along the direction of the second light guide plate towards the optical peep-proof structure.
In one embodiment, the number of film layers is 50 to 100.
In one embodiment, each film layer has a thickness of 2 μm to 6 μm.
In one embodiment, the thickness of the unidirectional light transmitting group is 0.2mm to 0.3mm.
In one embodiment, the optical peep-proof structure comprises a plurality of light-blocking walls arranged in parallel, the light-blocking walls are arranged at intervals along the arrangement direction of the first light source and the first light guide plate, a light-transmitting area is formed between two adjacent light-blocking walls, and the side face, close to the light-transmitting area, of each light-blocking wall is a light-absorbing face or a light-reflecting face.
In one embodiment, in the case that the side surface of the light blocking wall is a light absorbing surface, the light blocking wall is made of a light absorbing material, or the side surface of the light blocking wall is provided with a light absorbing layer made of a light absorbing material to form a light absorbing surface; in the case that the side surface of the light blocking wall is a light reflecting surface, the light blocking wall is made of a light reflecting material, or the side surface of the light blocking wall is provided with a light reflecting layer made of the light reflecting material to form the light reflecting surface.
In one embodiment, a surface of a side of the second light guide plate facing the optical peep-proof structure is provided with a plurality of light guide dots, and the unidirectional light transmission group is arranged on the surface where the light guide dots are located.
In one embodiment, the diameter of the light directing dots is less than or equal to 50 μm.
As another aspect of the embodiments of the present application, the embodiments of the present application provide a display device, including a backlight module according to any one of the embodiments described above.
According to the technical scheme, the brightness loss of the backlight module in the sharing state can be reduced, the brightness of the display device is effectively improved, the display effect is improved, the user requirements are met, and the cost is low.
The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description.
Drawings
In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.
Fig. 1 shows a schematic view of a light path of a backlight module in a peep-proof state;
FIG. 2 is a schematic view of the light path of the backlight module shown in FIG. 1 in a shared state;
fig. 3 shows a schematic structural diagram of a backlight module according to an embodiment of the present application;
FIG. 4 is a schematic view of an optical path of the backlight module shown in FIG. 3 in a peep-proof state;
FIG. 5 shows a schematic view of the light path of the backlight module shown in FIG. 3 in a shared state;
FIG. 6 shows a schematic view of an optical path of a unidirectional light transmissive group according to an embodiment of the present application;
FIG. 7 illustrates another optical path schematic of a unidirectional light transmissive group in accordance with an embodiment of the present application;
fig. 8 shows a schematic structural diagram of a display device according to an embodiment of the present application.
Reference numerals illustrate:
100: a backlight module; 110: a first light guide plate; 120: a first light source; 130: an optical privacy structure; 131: a light blocking wall; 132: a light transmission region; 140: a second light guide plate; 150: a second light source; 160: a unidirectional light transmission group; 161: a film layer; 170: an optical film material;
200: a display device; 201: a display panel; 2011: an array substrate; 2012: an opposite substrate; 2013: and a liquid crystal layer.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
Fig. 1 shows a schematic view of a light path of a backlight module in a peep-proof state; fig. 2 shows a schematic view of an optical path of the backlight module shown in fig. 1 in a sharing state. As shown in fig. 1 and 2, the backlight module 100 includes a first light guide plate 110, a first light source 120, an optical peep-proof structure 130, a second light guide plate 140, and a second light source 150. The first light source 120 is disposed on the light incident side of the first light guide plate 110. The optical peep-proof structure 130 is disposed on the light-emitting side of the first light guide plate 110. The second light guide plate 140 is disposed on a side of the optical peep-proof structure 130 facing away from the first light guide plate 110. The second light source 150 is disposed on the light incident side of the second light guide plate 140.
When the backlight module 100 is in the peep-proof state, the first light source 120 is turned on, and the second light source 150 is turned off. The light emitted by the first light source 120 enters the optical peep-proof structure 130 after being guided by the first light guide plate 110, and then forms collimated light under the action of the optical peep-proof structure 130, so that the viewing angle is contracted, and the display device is in a peep-proof state. In the shared state of the backlight module 100, the first light source 120 and the second light source 150 are both turned on. The light emitted by the first light source 120 enters the optical peep-proof structure 130 after being guided by the first light guide plate 110, and then forms collimated light under the action of the optical peep-proof structure 130. Meanwhile, the light emitted by the second light source 150 is emitted after being guided by the second light guide plate 140, so that the viewing angle is increased, and the display device is in a sharing state. Under the condition that the backlight module 100 is in the sharing state, the brightness loss is serious, so that the display brightness of the display device is low, and the user requirement cannot be met. For this problem, the display brightness of the display device can be increased in the following two ways: the first way is: adding an optical film material; the second way is: increasing the current of the first light source 120 and/or the second light source 150 and increasing the number of LEDs in the first light source 120 and/or the second light source 150. However, the first manner may destroy the viewing angle of the display device in the peep-proof state, and reduce the confidentiality of the display device. The second method increases the cost of the backlight module 100 and affects heat dissipation.
In order to solve the above problems, a first aspect of the present application provides a backlight module. Fig. 3 shows a schematic structural diagram of a backlight module according to an embodiment of the present application. As shown in fig. 3, the backlight module 100 includes a first light guide plate 110, a first light source 120, an optical peep-proof structure 130, a second light guide plate 140, a second light source 150 and a unidirectional light-transmitting group 160.
The first light source 120 is disposed on the light incident side of the first light guide plate 110. The optical peep-proof structure 130 is disposed on the light-emitting side of the first light guide plate 110. The second light guide plate 140 is disposed on a side of the optical peep-proof structure 130 facing away from the first light guide plate 110. The second light source 150 is disposed on the light incident side of the second light guide plate 140.
The first and second light guide plates 110 and 140 may be made of a high light-transmitting material, such that the transparency of the first and second light guide plates 110 and 140 may be greater than a preset transparency, and light may be smoothly emitted. For example: the materials of the first and second light guide plates 110 and 140 may be transparent copolymers, polycarbonate (PC), polymethyl methacrylate (Poly (methyl methacrylate), PMMA), glass, or the like synthesized from methyl methacrylate (methyl methacrylate, MMA) and Styrene (SM) as main raw materials. The first light source 120 and the second light source 150 may be disposed at different sides. The first light source 120 and the second light source 150 may be LED light bars, but are not limited thereto.
Illustratively, the first light guide plate 110 may include a first light incident side surface, a first reflective bottom surface, and a first light exiting surface. The first light incident side surface and the first reflecting side surface are oppositely arranged. The first light source 120 is located on a side of the first light entrance side facing away from the first reflective side. The first reflecting bottom surface and the first light-emitting surface are oppositely arranged. The first reflecting bottom surface is connected to the bottom end of the first light incident side surface and the bottom end of the first reflecting side surface. The first light emitting surface is connected to the top of the first light incident side surface and the top of the first reflecting side surface. The second light guide plate 140 may include a second light incident side, a second reflective bottom, and a second light exiting surface. The second light incident side surface and the second reflecting side surface are oppositely arranged. The second light source 150 is located on a side of the second light entrance side facing away from the second reflective side. The second reflecting bottom surface and the second light emitting surface are oppositely arranged. The second reflecting bottom surface is connected with the bottom end of the second light incident side surface and the bottom end of the second reflecting side surface. The second light emitting surface is connected to the top of the second light incident side surface and the top of the second reflecting side surface. The optical privacy structure 130 may be located between the first light-emitting surface and the second reflective bottom surface.
The unidirectional light-transmitting set 160 is disposed between the second light guide plate 140 and the optical peep-preventing structure 130, and the unidirectional light-transmitting set 160 is used for transmitting at least part of the light incident from the optical peep-preventing structure 130 and reflecting at least part of the light incident from the second light guide plate 140.
Illustratively, the set of unidirectional light transmissive groups 160 may be located between the second reflective bottom surface and the optical privacy structure 130. Fig. 4 is a schematic view illustrating an optical path of the backlight module 100 shown in fig. 3 in a peep-proof state; fig. 5 illustrates a schematic light path of the backlight module 100 shown in fig. 3 in a shared state. As shown in fig. 4, when the backlight module 100 is in the peep-proof state, the first light source 120 is turned on, and the second light source 150 is turned off. The light emitted by the first light source 120 is guided by the first light guide plate 110 and then emitted from the first light emitting surface, and enters the optical peep-proof structure 130. Under the action of the optical peep-proof structure 130, the light with a large viewing angle is absorbed, and the collimated light enters the unidirectional light-transmitting group 160 through the optical peep-proof structure 130. Since the unidirectional light-transmitting group 160 is used for transmitting at least part of the light incident from the optical peep-preventing structure 130, at least part of the light incident from the optical peep-preventing structure 130 into the unidirectional light-transmitting group 160 can transmit the unidirectional light-transmitting group 160 and finally be emitted from the second light-emitting surface of the second light guide plate 140.
As shown in fig. 5, in the state that the backlight module 100 is in the sharing state, both the first light source 120 and the second light source 150 are turned on. The light emitted by the first light source 120 is guided by the first light guide plate 110 and then emitted from the first light emitting surface, and enters the optical peep-proof structure 130. Under the action of the optical peep-proof structure 130, the light with a large viewing angle is absorbed, and the collimated light passes through the optical peep-proof structure 130 and the unidirectional light-transmitting group 160 and finally exits from the second light-emitting surface. After the light emitted by the second light source 150 is guided by the second light guide plate 140, a part of the light is emitted from the second light emitting surface, and another part of the light enters the unidirectional light transmitting group 160 from the second reflective bottom surface. Since the unidirectional light-transmitting group 160 is used for reflecting at least part of the light incident from the second light guide plate 140, at least part of the light incident from the second light guide plate 140 may be reflected at the unidirectional light-transmitting group 160, and the reflected light may be emitted from the second light-emitting surface.
Optionally, an optical film 170 may be disposed between the optical privacy structure 130 and the first light guide plate 110, and the optical film 170 may include at least one of a reflective film, an anti-reflection film, a polarizing film, and an optical microlens film.
According to the backlight module 100 of the embodiment of the application, the unidirectional light-transmitting group 160 is arranged between the second light guide plate 140 and the optical peep-proof structure 130, and the unidirectional light-transmitting group 160 is used for transmitting at least part of light rays emitted from the optical peep-proof structure 130 and reflecting at least part of light rays emitted from the second light guide plate 140, so that the brightness loss of the backlight module 100 in a sharing state can be reduced, the brightness of a display device is effectively improved, the display effect is improved, the user requirements are met, and the cost is low.
FIG. 6 shows a schematic view of an optical path of the unidirectional light transmissive group 160 according to an embodiment of the present application; fig. 7 shows another schematic light path of the unidirectional light transmissive group 160 according to an embodiment of the present application. In one embodiment, referring to fig. 3, 6 and 7, the unidirectional light transmission group 160 may include a plurality of film layers 161, and the plurality of film layers 161 are arranged along the arrangement direction of the second light guide plate 140 and the optical privacy structure 130; the refractive index of the film 161 facing the second light guide plate 140 is greater than the refractive index of the film 161 facing the optical peep preventing structure 130. In the description of the present application, the meaning of "plurality" is two or more. For example, the number of the film layers 161 may be 50 to 100 (inclusive), but is not limited thereto.
Illustratively, the unidirectional light transmitting group 160 may be a composite film formed by compositing a plurality of film layers 161. The thickness of each film 161 may be equal or unequal. For example, the total thickness of the unidirectional light transmitting group 160 may be 0.2mm to 0.3mm (inclusive), and the thickness of each film layer 161 may be 2 μm to 6 μm (inclusive), but is not limited thereto.
For example, along the direction of the second light guide plate 140 toward the optical peep preventing structure 130, the plurality of film layers 161 may be the film layer N1 and the film layer N2 … … film layer Nm, respectively. Wherein m is an integer of 2 or more. The film 161 facing the second light guide plate 140 is a film N1, and the film 161 facing the optical peep preventing structure 130 is a film Nm. Therefore, the refractive index of the film layer N1 is larger than that of the film layer Nm. When the backlight module 100 is in the sharing state, after the light emitted by the second light source 150 is guided by the second light guide plate 140, a part of the light is emitted from the second light emitting surface, and another part of the light enters the unidirectional light transmitting group 160 from the second reflective bottom surface. Light entering the unidirectional light transmission group 160 sequentially passes through the film layers N1 to Nm, and each film layer 161 can reflect and refract light. Since the refractive index of the film N1 is greater than that of the film Nm, the incident angle of the light ray entering the film Nm is greater than that of the light ray entering the film N1. Under the condition that the incident angle of the light entering the film Nm is larger than or equal to the critical angle, the effect of total reflection can be achieved, so that the light loss can be avoided, and the display brightness is improved.
When the backlight module 100 is in the peep-proof state or the sharing state, the light emitted by the first light source 120 sequentially passes through the first light guide plate 110 and the optical peep-proof structure 130 and then enters the unidirectional light-transmitting group 160. Light entering the unidirectional light transmission group 160 sequentially passes through the film layers Nm to the film layer N1, and each film layer 161 can reflect and refract the light. Since the refractive index of the film N1 is greater than that of the film Nm, the incident angle of the light entering the film N1 is smaller than that of the light entering the film Nm, so that the light is easily transmitted through the unidirectional light transmission group 160, and the viewing angle of the display device is further reduced.
In this embodiment, by making the refractive index of the film layer 161 disposed facing the second light guide plate 140 greater than the refractive index of the film layer 161 disposed facing the optical peep-proof structure 130, on one hand, the unidirectional light-transmitting group 160 may reflect at least part of the light incident from the second light guide plate 140 when the backlight module 100 is in the shared state, thereby improving the display brightness; on the other hand, the unidirectional light transmission group 160 is easier to transmit light, the viewing angle of the display device can be further reduced, and the confidentiality of display of the display device is improved.
In one embodiment, referring to fig. 3, 6 and 7, the refractive indexes of the plurality of film layers 161 gradually decrease in the direction of the second light guide plate 140 toward the optical privacy structure 130.
When the backlight module 100 is in the peep-proof state, the light emitted by the first light source 120 sequentially passes through the light guiding and optical peep-proof structure 130 of the first light guiding plate 110 and then enters the unidirectional light transmitting group 160. Light entering the unidirectional light transmission group 160 sequentially passes through the film layers Nm to the film layer N1, and each film layer 161 can reflect and refract the light. Since the refractive indexes of the plurality of film layers 161 gradually decrease along the direction of the second light guide plate 140 toward the optical peep preventing structure 130, the incident angle of the light ray passing through the film layer Nm to the film layer N1 gradually decreases, so that the viewing angle of the display device can be effectively reduced.
When the backlight module 100 is in the sharing state, the light emitted by the first light source 120 sequentially passes through the light guiding and optical peeping-preventing structure 130 of the first light guiding plate 110 and then enters the unidirectional light transmitting group 160. The light entering the unidirectional light transmission group 160 sequentially passes through the film Nm to the film N1, and the incident angle gradually decreases, so that the light is more easily transmitted. After the light emitted by the second light source 150 is guided by the second light guide plate 140, a part of the light is emitted from the second light emitting surface, and another part of the light enters the unidirectional light transmitting group 160 from the second reflective bottom surface. Light entering the unidirectional light transmission group 160 sequentially passes through the film layers N1 to Nm, and each film layer 161 can reflect and refract light. Since the refractive indexes of the plurality of film layers 161 gradually decrease in the direction of the second light guide plate 140 toward the optical peep preventing structure 130, the incident angles of the light rays passing through the film layers N1 to Nm gradually increase. The incident angle of the light ray when reaching the Nm layer may be equal to or larger than the critical angle, thereby achieving the effect of total reflection.
In this embodiment, the refractive indexes of the plurality of film layers 161 gradually decrease along the direction of the second light guide plate 140 facing the optical peep-proof structure 130, so that the incident angle of the light beam incident from the second light guide plate 140 into the unidirectional light transmission group 160 can gradually increase, thereby enabling the light beam to generate total reflection and further improving the display brightness. In addition, the incident angle of the light incident into the unidirectional light transmission group 160 from the optical peep-proof structure 130 can be gradually reduced, so that the viewing angle of the display device is further reduced, and the confidentiality of the display device is improved.
In an embodiment, as shown in fig. 3 to 5, the optical peep-proof structure 130 may include a plurality of light-blocking walls 131 disposed in parallel, where the plurality of light-blocking walls 131 are arranged at intervals along the arrangement direction of the first light source 120 and the first light guide plate 110, a light-transmitting area 132 is formed between two adjacent light-blocking walls 131, and a side surface of each light-blocking wall 131, which is close to the light-transmitting area 132, is a light-absorbing surface or a light-reflecting surface.
In one example, when the side of the light blocking wall 131 near the light transmitting region 132 is a light absorbing surface, it may be implemented in various ways. For example: each light blocking wall 131 may be a light blocking wall 131 made of a light absorbing material, such that a side surface of the light blocking wall 131 adjacent to the light transmitting region 132 naturally forms a light absorbing surface; alternatively, the side of each light blocking wall 131 adjacent to the light transmitting region 132 may be provided with a light absorbing layer made of a light absorbing material to form a light absorbing surface. The cross-section of each light blocking wall 131 may have a rectangular shape. The light-blocking walls 131 have a certain thickness, and light rays irradiated on the light-absorbing surface of any light-blocking wall 131 can be absorbed by the light-absorbing surface, so that the light cannot pass through the optical peep-proof structure 130, the view angle is contracted, and the confidentiality of display of the display device is improved. Light not irradiated onto the light absorbing surface can pass through the light transmitting area 132, thereby passing through the optical peep-proof structure 130.
In another example, when the side of the light blocking wall 131 adjacent to the light transmitting region 132 is a reflective surface, it may be implemented in various ways. For example: each reflecting surface may be a light blocking wall 131 made of a light reflecting material, so that a side surface of the light blocking wall 131, which is close to the light transmitting area 132, naturally forms a reflecting surface; alternatively, the side of each light blocking wall 131 adjacent to the light transmitting region 132 may be provided with a light reflecting layer made of a light reflecting material to form a light reflecting surface. The cross-section of each light blocking wall 131 may have a triangular or trapezoidal shape, and the width of the light blocking wall 131 gradually increases along the direction of the first light guide plate 110 toward the second light guide plate 140 (not shown). Among the light rays entering the light-transmitting area 132, the light rays with an included angle between the incident direction and the thickness direction of the optical peep-proof structure 130 being larger than a preset value are reflected by the two reflecting surfaces corresponding to the light-transmitting area 132 and cannot pass through the optical peep-proof structure 130, so that the viewing angle can be contracted as well, and the confidentiality of display of the display device is improved.
In one embodiment, a surface of the second light guide plate 140 facing the optical peep preventing structure 130 is provided with a plurality of light guide dots, and the unidirectional light transmitting group 160 is disposed on the surface of the light guide dots. For example, a plurality of light guide dots may be disposed on the second reflective bottom surface of the second light guide plate 140.
In this embodiment, by arranging the plurality of light guide dots, when the backlight module 100 is in the sharing state, a part of light is emitted from the light emitting surface (i.e. the second light emitting surface) of the second light guide plate 140, another part of light is emitted from the surface (i.e. the second reflective bottom surface) of the second light guide plate 140 facing the unidirectional light transmitting group 160, and the plurality of light guide dots arranged on the surface can scatter the light, so that the uniformity of the light can be improved. Optionally, the diameter of the light-guiding dots is less than or equal to 50 μm to avoid affecting the display effect.
A second aspect of the present application provides a display device. Fig. 8 shows a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 8, the display device 200 includes a display panel 201 and the backlight module 100 according to any of the above embodiments, where the display panel 201 is disposed on the light emitting side of the second light guide plate 140 of the backlight module 100. The display device 200 may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
For example, the display panel 201 may include an array substrate 2011, a counter substrate 2012, and a liquid crystal layer 2013. The array substrate 2011 and the counter substrate 2012 are disposed opposite to each other, and the liquid crystal layer 2013 is disposed between the array substrate 2011 and the counter substrate 2012. The backlight module 100 may be located at a side of the array substrate 2011 facing away from the opposite substrate 2012.
Other configurations of the backlight module 100 and the display device 200 of the above-described embodiment may be applied to various technical solutions known to those skilled in the art now and in the future, and will not be described in detail herein.
In the description of the present specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
The above disclosure provides many different embodiments or examples for implementing different structures of the present application. The components and arrangements of specific examples are described above in order to simplify the disclosure of this application. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the present application, and these should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A backlight module, comprising:
a first light guide plate;
the first light source is arranged on the light inlet side of the first light guide plate;
the optical peep-proof structure is arranged on the light emitting side of the first light guide plate;
the second light guide plate is arranged on one side of the optical peep-proof structure, which is away from the first light guide plate;
the second light source is arranged on the light inlet side of the second light guide plate;
the unidirectional light transmission group is arranged between the second light guide plate and the optical peep-proof structure and is used for transmitting at least part of light rays emitted from the optical peep-proof structure and reflecting at least part of light rays emitted from the second light guide plate.
2. The backlight module according to claim 1, wherein the unidirectional light-transmitting group comprises a plurality of film layers, and the plurality of film layers are arranged along the arrangement direction of the second light guide plate and the optical peep-proof structure; the refractive index of the film layer arranged facing the second light guide plate is larger than that of the film layer arranged facing the optical peep-proof structure.
3. The backlight module according to claim 2, wherein the refractive indexes of the plurality of film layers gradually decrease along the direction of the second light guide plate toward the optical peep preventing structure.
4. A backlight module according to claim 2, wherein the number of film layers is 50-100.
5. A backlight module according to claim 2, wherein each of the film layers has a thickness of 2 μm to 6 μm.
6. A backlight module according to claim 1, wherein the thickness of the unidirectional light transmission group is 0.2mm to 0.3mm.
7. The backlight module according to claim 1, wherein the optical peep-proof structure comprises a plurality of parallel light-blocking walls, the light-blocking walls are arranged at intervals along the arrangement direction of the first light source and the first light guide plate, a light-transmitting area is formed between two adjacent light-blocking walls, and the side surface, close to the light-transmitting area, of each light-blocking wall is a light-absorbing surface or a light-reflecting surface.
8. A backlight module according to claim 7, wherein in the case that the side surface of the light blocking wall is a light absorbing surface, the light blocking wall is made of a light absorbing material, or the side surface of the light blocking wall is provided with a light absorbing layer made of a light absorbing material to form the light absorbing surface;
and under the condition that the side surface of the light-blocking wall is a light-reflecting surface, the light-blocking wall is made of a light-reflecting material, or the side surface of the light-blocking wall is provided with a light-reflecting layer made of the light-reflecting material so as to form the light-reflecting surface.
9. A backlight module according to any one of claims 1-8, wherein a surface of the second light guide plate facing the optical peep-proof structure is provided with a plurality of light guide dots, and the unidirectional light transmission group is disposed on a surface where the light guide dots are located.
10. A backlight module according to claim 9, wherein the diameter of the light-guiding dots is less than or equal to 50 μm.
11. A display device, comprising:
the backlight module according to any one of claims 1-10;
the display panel is arranged on the light emitting side of the second light guide plate of the backlight module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311461268.0A CN117389081A (en) | 2023-11-06 | 2023-11-06 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311461268.0A CN117389081A (en) | 2023-11-06 | 2023-11-06 | Backlight module and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117389081A true CN117389081A (en) | 2024-01-12 |
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ID=89468205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311461268.0A Pending CN117389081A (en) | 2023-11-06 | 2023-11-06 | Backlight module and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117389081A (en) |
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2023
- 2023-11-06 CN CN202311461268.0A patent/CN117389081A/en active Pending
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