CN115407551A - Display device - Google Patents

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Publication number
CN115407551A
CN115407551A CN202110593057.7A CN202110593057A CN115407551A CN 115407551 A CN115407551 A CN 115407551A CN 202110593057 A CN202110593057 A CN 202110593057A CN 115407551 A CN115407551 A CN 115407551A
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China
Prior art keywords
light
light source
display device
angle
shielding layer
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CN202110593057.7A
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Chinese (zh)
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CN115407551B (en
Inventor
宗志豪
李富琳
张楠楠
刘晓杰
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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Priority to CN202110593057.7A priority Critical patent/CN115407551B/en
Priority to PCT/CN2022/095745 priority patent/WO2022247941A1/en
Publication of CN115407551A publication Critical patent/CN115407551A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention discloses a display device, comprising: the display device comprises a display panel and a backlight module; the backlight module includes: a back panel and a lamp panel; the lamp panel comprises a light source, a light-emitting surface of the light source is provided with a shielding layer, the shielding layer has a reflection effect on at least part of incident light, and the intensity of emergent light at the top of the light source can be weakened; and when the light reflected by the shielding layer reaches the bottom of the light source, the light can be reflected again and finally emitted from the side surface of the light source, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity of each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.

Description

Display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
With the rapid progress of Liquid Crystal Display (LCD) manufacturing technology and the advantages of lightness, thinness, power saving, and no radiation, the LCD is widely used in various electronic products such as notebook computers, digital cameras, digital camcorders, mobile phones, computer screens, and LCD tvs.
The backlight module is one of the key components of the liquid crystal display panel, and provides the liquid crystal display panel with sufficient brightness and uniformly distributed light source, so that the liquid crystal display panel can normally display images. The backlight module that uses commonly at present includes side income formula backlight unit and straight following formula backlight unit, in order to guarantee the homogeneity of display screen luminance, need set up certain mixed light distance between light source and the diffuser plate, nevertheless satisfy display device slim development demand, mixed light distance reduces under the unchangeable condition of light source quantity and light source interval, can lead to in backlight unit, the position is more bright than usual on the light source, two adjacent light source handing-over positions are more dark, display device's the inhomogeneous problem of display effect.
Disclosure of Invention
In some embodiments of the present invention, a display device includes: the display device comprises a display panel and a backlight module; the backlight module includes: a back panel and a lamp panel; the lamp panel comprises a light source, a light-emitting surface of one side, away from the back plate, of the light source is provided with a shielding layer, the shielding layer has a reflection effect on at least part of incident light, and the emergent light intensity at the top of the light source can be weakened; and when the light reflected by the shielding layer reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side face of the light source, so that the intensity of the light emitted from the side face of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the present invention, the lamp panel further includes: the circuit board is positioned on the back plate and used for providing a driving signal; the reflecting layer is positioned on one side of the circuit board close to the light source, comprises an opening for exposing the light source and has the property of reflecting light.
In some embodiments of the invention, a light source comprises: the LED comprises a micro LED, a packaging structure and a shielding layer; the shielding layer has a reflection effect on at least part of incident light, and can weaken the emergent light intensity at the top of the light source; and when the light reflected by the shielding layer reaches the bottom of the light source, the light can be reflected again and finally emitted from the side surface of the light source, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity of each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the invention, the backlight module further comprises an angle selection film, and the angle selection film can increase the reflection of light rays with an incident angle of 0-70 degrees and increase the reflection of light rays with an incident angle of 70-90 degrees. Although the light-emitting surface of the light source, which is away from the back plate, is provided with the shielding layer, the shielding layer has a reflection effect on at least part of incident light, but part of light with small angle still penetrates through the shielding layer. The angle selection film can increase the reflection of the small-angle light rays emitted through the shielding layer, the light rays are reflected to the direction of the lamp panel by the angle selection film, and the emitted large-angle light rays are emitted in a reflection-increasing manner; the small-angle light reflected to the lamp panel direction forms a part of large-angle light after being scattered or diffused by the reflecting layer, so that the small-angle light is reflected to the lamp panel direction to be emitted in an anti-reflection manner by the angle selecting film, the emergent intensity of the small-angle light close to the emergent center is reduced, the emergent intensity of the large-angle light far away from the emergent center is increased, the final emergent illumination is consistent, and the uniformity of light source emergent light is improved.
In some embodiments of the present invention, the angle selective film has a reflectivity of 70% to 90% for 0 ° incident light, and the angle selective film has a reflectivity of sequentially decreasing for 0 ° to 70 ° incident light and a transmittance of sequentially increasing.
In some embodiments of the invention, the shielding layer comprises a matrix and reflective particles, the reflective particles have a reflective effect on incident light, when the light is incident on the shielding layer, part of the incident light can be incident on the reflective particles and reflected by the reflective particles, so that the emergent light intensity at the top of the light source is reduced; and when the light reflected by the reflecting particles reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the present invention, the following results are obtained by multiple optical simulation experiments: when the shielding layer includes a matrix and reflective particles, the content of the reflective particles and the reflectivity of the angle selection film to 0 ° incident light satisfy the following relationship:
75％<(a+b)<115％
wherein a represents the content of the reflective particles, and b represents the reflectance of the angle selection film against 0 ° incident light; and when the content a of the reflective particles is in the range of 5% -25%, and the reflectivity of the angle selection film to 0-degree incident light is in the range of 70% -90%, the emergent light intensity at the top of the light source can be weakened, the light-emitting angle of the light source can be increased, and the phenomenon that the intensity of emergent light above the light source is excessively reduced after the shielding layer is combined with the angle selection film to cause a shadow above the light source can be avoided. When the content a of the reflective particles and the reflectivity b of the angle selection film to 0-degree incident light satisfy the relationship, the uniformity of backlight light emission of the display device can be ensured, the light emission range of a single light source is enlarged, and the H/P value is greatly reduced to be below 0.2.
In some embodiments of the present invention, the reflective particles may be titanium dioxide. When the content of the titanium dioxide provided by the invention is 30%, the H/P value can be reduced to about 0.5 from more than 0.6.
In some embodiments of the invention, the shielding layer can be a diffusion layer, the diffusion plate is provided with scattering particle materials, and light rays incident on the scattering particle materials can be refracted and reflected continuously, so that the effect of scattering the light rays is achieved, and the problem of partial brightness above a light source can be avoided; in addition, the light reflected to the bottom of the light source by the scattering particle material can be reflected again and finally emitted out from the side surface of the light source, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity of all positions in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the invention, the following is obtained by formula fitting: the content of the reflective particles, the reflectivity of the angle selection film to 0 common incident light, the light mixing distance and the spacing distance between two adjacent light sources satisfy the following relations:
Figure BDA0003090261680000041
wherein, a represents the content of the reflective particles, B represents the reflectivity of the angle selection film to 0 degree incident light, H represents the light mixing distance (distance from the line layer to the lower surface of the diffusion plate), P represents the spacing distance between two adjacent light sources, A represents the concentration coefficient of the shielding layer, and B represents the reflectivity coefficient of the angle selection film; the value range of the concentration coefficient A of the shielding layer is 6.8-7.0; the angle selection film has a reflectance coefficient B in the range of 4.5 to 4.7. Therefore, the light mixing distance and the spacing distance between two adjacent light sources can be adjusted according to the relation, and the requirements of different display devices are met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structural view of a display device according to an embodiment of the present invention;
fig. 2 is a schematic partial cross-sectional view of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a light source according to an embodiment of the present invention;
fig. 4 is a second schematic partial sectional view of a backlight module according to an embodiment of the invention;
fig. 5 is a third schematic partial sectional view of a backlight module according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an operation of an angle selection film according to an embodiment of the present invention.
The backlight module comprises a backlight module 100, a display panel 200, a backboard 11, a lamp panel 12, a diffuser 13, an optical film 14, a diffuser bracket 15, an angle selection film 16, a circuit board 121, a light source 122, a reflecting layer 123, a substrate 1211, a circuit layer 1212, a micro light-emitting diode 1221, a 1222-packaging structure and a shielding layer 1223.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
The liquid crystal display mainly comprises a backlight module and a liquid crystal display panel. The liquid crystal display panel does not emit light, and brightness display needs to be realized by a light source provided by the backlight module.
The display principle of the liquid crystal display is that liquid crystal is placed between two pieces of conductive glass, and the electric field effect of liquid crystal molecule distortion is caused by the driving of an electric field between two electrodes so as to control the transmission or shielding function of a backlight source, thereby displaying an image. If a color filter is added, a color image can be displayed.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
Referring to fig. 1, the display device includes: a backlight module 100 and a display panel 200.
The display panel 200 is located at the light-emitting side of the backlight module 100, the shape and size of the display panel are generally matched with those of the backlight module, and the display panel 200 may be set to be rectangular in general, including a top side, a bottom side, a left side and a right side, where the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the top side and one end of the bottom side, and the bottom side is connected to the other end of the top side and the other end of the bottom side.
The display panel 200 is a transmissive display panel, which can modulate the transmittance of light, but does not emit light by itself. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
The backlight module 100 is usually located at the bottom of the display device, and its shape and size are adapted to the shape and size of the display device. When applied to the field of televisions or mobile terminals, the backlight module generally takes a rectangular shape.
Fig. 2 is a schematic partial cross-sectional view of a backlight module according to an embodiment of the invention.
Referring to fig. 2, the backlight assembly includes: back panel 11, lamp panel 12, diffuser plate 13, optical film 14, and diffuser plate holder 15.
The back plate 11 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 11 is typically a rectangular structure, the shape of which is adapted to the shape of the display device when applied to a contoured display device. The back panel 11 includes a top side, a bottom side, a left side, and a right side. Wherein the top side is opposite to the ground side, the left side is opposite to the right side, the top side is respectively connected with one end of the left side and one side of the right side, and the ground side is respectively connected with the other end of the left side and the other end of the right side.
The material of the back plate 11 is aluminum, iron, aluminum alloy or iron alloy. The back plate 11 is used for supporting the lamp panel 12 and supporting and fixing edge positions of the diffusion plate 13, the optical film 14 and other components, and the back plate 11 also plays a role in heat dissipation of the lamp panel 12.
In the embodiment of the present invention, the backlight module is a direct type backlight module, and the lamp panel 12 is located above the back panel 11. In general, the lamp panel 12 may be square or rectangular in shape, and when applied to a special-shaped display device, the shape and size of the lamp panel are adapted to the shape and size of the display device.
According to display device's size can set up a plurality of lamp plates 12, provides backlight jointly through the concatenation mode between lamp plate 12. In order to avoid the optical problem brought by the splicing of the lamp panels 12, the splicing seams between the adjacent lamp panels 12 are as small as possible, and even seamless splicing is realized.
Specifically, as shown in fig. 2, the lamp panel 12 specifically includes: circuit board 121, light source 122, and reflective layer 123.
The circuit board 121 includes a substrate 1211 and a wiring layer 1212; the substrate 1211 is located on the back plate 11, and the shape of the substrate 1211 is the same as the overall shape of the lamp panel 12. In general, the substrate 1211 has a plate shape and has a rectangular or square shape as a whole.
In the embodiment of the present invention, the substrate 1211 may be made of glass with a high thermal conductivity, and the substrate 1211 made of glass with a high thermal conductivity can quickly dissipate heat generated by the display device during displaying, so as to avoid the problem of reducing the light emitting efficiency caused by an over-high temperature. Alternatively, the substrate 1211 may be made of a material such as FR4 or PET, but is not limited thereto.
The circuit layer 1212 provided in the embodiment of the present invention is formed by electroplating and depositing a conductive material on the substrate 1211, and etching the circuit according to the requirement, wherein the conductive material may be copper, which is not limited herein. The conductive material will etch a fracture, and the two sides of the fracture are respectively connected to the anode and the cathode of the light source 122.
When the Circuit layer 1212 is formed by the etching process, the substrate 1211 and the Circuit layer 1212 may form a Circuit Board, which may be a Printed Circuit Board (PCB); alternatively, when the circuit layer 1212 is formed by a thin film process, the substrate 1211 and the circuit layer 1212 may also form an array substrate, which is not limited herein.
The light source 122 is located on the circuit layer 1212, and after the circuit layer 1212 is completed, a pad for welding the light source 122 is formed on a surface of the circuit layer 1212, and the light source 122 is welded on the pad, so that the light source 122 is driven to emit light by controlling a driving signal of the circuit layer 1212.
In the embodiment provided by the present invention, the light emitting surface of the light source 122 on the side away from the back plate 11 is provided with the shielding layer 1223, and the shielding layer 1223 has a reflection effect on at least part of incident light, so that the intensity of the light emitting from the top of the light source 122 can be reduced; and when reaching the bottom of the light source 122, the light reflected by the shielding layer 1223 can be reflected again and finally emitted out from the side of the light source 122, which not only increases the intensity of the light emitted from the side of the light source 122, homogenizes the light intensity at various positions in the light emitting range, but also increases the light emitting angle of the light source 122. Therefore, the problems of the light sources 122 being over bright and the adjacent light sources 122 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 122, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 122 used can be reduced without changing the light mixing distance, thereby reducing the cost.
The reflective layer 123 is located on a side of the circuit board 121 close to the light source 122, the reflective layer 123 has a shape and a size corresponding to those of the circuit board 121, and the reflective layer 123 includes a plurality of openings for exposing the light source 122 and has a property of reflecting light.
In the embodiment of the present invention, the reflective layer 123 is coated on a surface of the circuit board 121 on a side away from the back plate 11 by using a material having a light reflection property, where the material may be a white ink having a property of reflecting light, and a reflectivity of the white ink is greater than or equal to 85%, which is not limited herein.
In other embodiments of the present invention, the reflective layer 123 may also be a reflective sheet, and the reflective sheet is manufactured by coating a colloid mixed with reflective particles on the surface of the substrate, and the reflectivity of the reflective sheet is greater than or equal to 97%.
The reflective layer 123 provided by the embodiment of the present invention may be a diffuse reflective layer, and the diffuse reflective layer may make the reflection path of the reflected light random, so as to homogenize the light.
The diffuser 13 is located on the light emitting side of the light source 122, and the shape of the diffuser 13 is the same as the overall shape of the lamp panel 12. The diffuser plate 13 may be provided in a rectangular or square shape in a general case.
The diffusion plate 13 functions to diffuse incident light, so that the light passing through the diffusion plate 13 is more uniform. The diffusion plate 13 is provided with scattering particle materials, and light incident to the scattering particle materials can be refracted and reflected continuously, so that the effect of scattering the light is achieved, and the effect of light uniformization is achieved.
The diffusion plate 13 has a higher haze and a more uniform effect, and can be processed by an extrusion process, and the material of the diffusion plate 13 is generally selected from at least one of polymethyl methacrylate PMMA, polycarbonate PC, polystyrene materials PS, and polypropylene PP.
When the light source 122 of the lamp panel 12 only emits blue light, quantum dot materials may be further disposed in the diffusion plate 13 to form a quantum dot diffusion plate, where the quantum dot materials include red quantum dot materials and green quantum dot materials, and the red quantum dot materials emit red light with a wavelength of about 620nm to 640nm under excitation of blue light; the green quantum dot material emits green light with the wavelength of about 520nm-540nm under the excitation of blue light, and the red light and the green light emitted by the excitation and the transmitted blue light are mixed to form white light to be emitted.
The quantum dot diffusion plate is not provided with a quantum dot film in the subsequent process of manufacturing the backlight module, so that the cost is reduced, and the display device is lighter and thinner.
The optical film 14 is located on a side of the diffusion plate 13 facing away from the lamp panel 12, and the optical film 14 is disposed in a whole layer and has a shape identical to the whole shape of the diffusion plate 13, and may be disposed in a rectangular or square shape in general.
The optical film 14 can be disposed to adapt the backlight module to various practical applications.
In embodiments provided by the present invention, the light source 122 may be a blue light device, and the optical film 14 includes a quantum dot layer or a fluorescent layer.
The quantum dot layer comprises a red quantum dot material and a green quantum dot material, the red quantum dot material emits red light under the excitation of blue light, the green quantum dot material emits green light under the excitation of the blue light, and the red light, the green light and the transmitted blue light which are emitted by excitation are mixed into white light to be emitted.
The fluorescent layer comprises fluorescent materials for stimulating and emitting red light and stimulating and emitting green light, and the red light, the green light and the transmitted blue light which are stimulated and emitted are mixed into white light to be emitted.
In addition, the optical film 14 may further include a prism sheet, which can change the exit angle of light, thereby changing the viewable angle of the display device.
The optical film 14 may further include a reflective polarizer, which is used as a brightness enhancement film to improve the brightness of the backlight module, improve the utilization efficiency of light, and make the emergent light have polarization property, thereby omitting the use of a polarizer under the lcd panel.
Since the diffuser 13 needs to cover all areas of the lamp panel 12, and has a relatively large size, and is easily subject to collapse and warping deformation, which deteriorates the optical characteristics of the backlight module, and even damages the light sources 122, a diffuser bracket 15 is usually disposed between the reflective layer 123 and the diffuser 13 for supporting the diffuser 13.
The material used for the diffuser plate holder 15 is generally polycarbonate PC.
In practical applications, the diffuser plate holder 15 may be in the shape of a triangle, a trapezoid, a cone, etc., which are simple shapes, and is not limited herein.
Fig. 3 is a schematic cross-sectional structural diagram of a light source according to an embodiment of the present invention.
Referring to fig. 3, the light source 122 specifically includes: micro light emitting diode 1221, package 1222, and shielding layer 1223.
The micro light emitting diode 1221 is located on a side of the circuit board 121 facing away from the back-plate 11, and is different from a common light emitting diode, which is specifically referred to as a micro light emitting diode chip. Because the size of the micro light-emitting diode is very small, the dynamic light-emitting of the backlight module is favorably controlled to smaller subareas, and the contrast of pictures is favorably improved. In embodiments of the present invention, the micro-leds may be in various sizes, for example, the micro-leds may be smaller than 500 μm. The micro light emitting diode can be manufactured in a corresponding size according to practical application, and is not limited herein.
The micro light emitting diode 1221 adopted in the embodiment of the present invention may be a micro light emitting diode of one color, or may be a micro light emitting diode of multiple colors, which is not limited herein.
The package structure 1222 is located on the surface of the micro light emitting diode 1221, and is used for protecting the micro light emitting diode 1221 and blocking foreign matters from entering the micro light emitting diode 1221.
In the embodiments provided herein, the package structure 1222 may be a package support; specifically, the micro light emitting diode 1221 is packaged by a POB packaging method, and a package support is disposed outside the micro light emitting diode 1221. In the embodiment of the present invention, when the micro light emitting diode 1221 is packaged in the POB packaging manner, the lower surface of the micro light emitting diode 1221 forms a patch electrode, the patch electrode is electrically connected to the corresponding electrode of the micro light emitting diode 1221, and after the micro light emitting diode 1221 is packaged, the packaged micro light emitting diode 1221 is mounted on the corresponding position of the circuit layer 1212. The POB packaging mode has mature process and good adaptability.
The shielding layer 1223 is located on a side of the package structure 1222 facing away from the circuit board 121. In the embodiment of the present invention, the shielding layer 1223 may be a diffusion layer, and the diffusion plate is provided with scattering particle materials, so that light incident on the scattering particle materials can be refracted and reflected continuously, thereby achieving the effect of scattering light and avoiding the problem of light above the light source 122; in addition, the light reflected back to the bottom of the light source 122 by the scattering particle material can be reflected again and finally emitted out from the side of the light source 122, which not only increases the intensity of the light emitted from the side of the light source 122, homogenizes the light intensity at various positions in the light emitting range, but also increases the light emitting angle of the light source 122. Therefore, the problems of the light sources 122 being over bright and the adjacent light sources 122 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 122, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 122 used can be reduced without changing the light mixing distance, thereby reducing the cost.
In another embodiment provided by the present invention, the shielding layer 1223 includes a matrix and reflective particles, the reflective particles have a reflective effect on incident light, when the light enters the shielding layer 1223, a part of the incident light will enter the reflective particles and be reflected by the reflective particles, so as to reduce the intensity of the emergent light from the top of the light source 122; and when the light reflected by the reflected particles reaches the bottom of the light source 122, the light can be reflected again and finally emitted out from the side surface of the light source 122, so that the intensity of the light emitted from the side surface of the light source 122 is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source 122 is increased. Therefore, the problems of the light sources 122 being over bright and the adjacent light sources 122 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 122, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 122 used can be reduced without changing the light mixing distance, thereby reducing the cost.
The reflective particles provided by the embodiment of the invention can be titanium dioxide. At present, the H/P value (the distance from the upper surface of lamp panel 12 to the lower surface of diffuser 13, i.e. the light mixing distance/the spacing distance between two adjacent light sources 122) is usually used to measure the relationship between the cost (the number of light sources 122) and the thickness of the backlight module. Currently, the H/P value in the industry is generally above 0.6, and the smaller the H/P value, the thinner the module thickness, or the fewer the number of light sources 122 used. When the content of the titanium dioxide provided by the embodiment of the invention is 30%, the H/P value can be reduced to about 0.5 from more than 0.6, and the development requirement of thinning the display device is met on the premise of not increasing the manufacturing cost (not changing the number of the light sources 122).
Fig. 4 is a second schematic partial sectional view illustrating a backlight module according to an embodiment of the invention. Fig. 5 is a third schematic partial sectional view of a backlight module according to an embodiment of the invention.
Referring to fig. 4 and 5, the backlight assembly further includes: an angle selection film 16.
The angle selection film 16 is located on one side of the diffusion plate 13 close to the lamp panel 12, and the angle selection film 16 can increase the reflection of light rays within the range of 0-70 degrees and increase the reflection of light rays within the range of 70-90 degrees. Wherein, the range of 0 to 70 degrees refers to the small-angle light emitted from the light source 123, and the range of 70 to 90 degrees refers to the large-angle light emitted from the light source 123. Although the shielding layer 1223 is disposed on the light-emitting surface of the light source 122 on the side away from the back plate 11, the shielding layer 1223 has a reflection effect on at least part of incident light, but part of light with a small angle still passes through the shielding layer 1223. The angle selection film 16 can increase the reflection of the small-angle light emitted through the shielding layer 1223, the light is reflected by the angle selection film 16 to the direction of the lamp panel 12, and the emitted large-angle light is increased in reflection; the small-angle light reflected to the lamp panel 12 direction forms a part of large-angle light after being scattered or diffused by the reflecting layer 123, so that the light is reflected by the angle selection film 16, the emergent intensity of the small-angle light close to the emergent center is reduced, the emergent intensity of the large-angle light far away from the emergent center is increased, the final emergent illumination is consistent, and the uniformity of the emergent light of the light source 122 is improved.
Specifically, the shape of the angle selection film 16 is the same as that of the diffuser plate 13, the thickness of the angle selection film 16 is in a range of 30-60 μm, and since the thickness of the angle selection film 16 is relatively thin, in the embodiment provided by the present invention, the angle selection film 16 is formed on the surface of the diffuser plate 13 on the side close to the lamp panel 12, so as to ensure the flatness of the angle selection film 16 itself, and further ensure the optical effect of the angle selection film 16.
The angle selective film 16 provided in the embodiment of the present invention utilizes the thin film interference principle to increase the reflection or increase the transmission of light at a specific incident angle, and the reflection or increase transmission of light depends on the incident angle of light incident on the film layer, the refractive index of the film layer, and the thickness of the film layer, so that in order not to affect the calculation of the thickness of the film layer, it is desirable to avoid adjacently disposing two film layers having the same refractive index. And the single-layer film layer has limited reflection increasing or reflection reducing effect on incident light, and in specific implementation, the reflection increasing or reflection reducing effect of the angle selection sheet can be improved by adopting a mode that a plurality of film layers are arranged in a group and a plurality of groups of film layers are arranged in a laminated mode.
The principle of reflecting small-angle rays while transmitting large-angle rays in the angle selection film 16 will be specifically described below.
As shown in fig. 6, when light is incident from a medium having a refractive index n1 to the surface of the film having a refractive index n2 at an incident angle i, light is reflected and refracted at the interface between n1 and n2, the reflection angle is equal to the incident angle and is still i, and the refraction angle is γ; and the refracted ray, when incident on the lower surface of the film, will also undergo reflection and refraction of light at the lower surface, wherein the reflected ray will pass through the upper surface of the film and refract into the n1 medium, thereby forming two reflected rays (1) and (2) at the upper surface and the lower surface of the film. The optical path difference δ' between the reflected light ray (1) and the reflected light ray (2) is:
Figure BDA0003090261680000121
if the film with refractive index n2 has a thickness d and is a thin film with uniform thickness, the refractive index n2 is higher than the refractive index d
Figure BDA0003090261680000122
And is
Figure BDA0003090261680000123
It is thus possible to obtain:
Figure BDA0003090261680000124
from the law of refraction:
n 1 sin i＝n 2 sin r
thus, it is possible to obtain:
Figure BDA0003090261680000125
as can be seen from the above formula, if a multilayer film structure is provided, the optical path difference of the reflected light of the light on the upper limit surface of each layer of medium is only related to the refractive index, thickness and incident angle from the air layer of the layer (according to the law of refraction n) 1 sini＝n 2 sinr knowing that the angle of incidence is fixed).
Figure BDA0003090261680000131
Where n2 is the refractive index of a certain layer of medium and i is the angle of incidence from the air layer.
Figure BDA0003090261680000132
Increase of adverse reaction
Figure BDA0003090261680000133
Permeability increasing
By utilizing the principle, a multilayer film structure is designed, and the reflectivity or the transmittance at different angles can be controlled by arranging reflection increasing or reflection reducing films with different layers aiming at different angles. The angle selection film 16 provided in the embodiment of the present invention can reflect a portion of the small-angle light rays originally irradiated at the position right above the light source 122, and then transfer the reflected portion of the small-angle light rays to the position where the light source 122 and the light source 122 are located at the interface, thereby improving the uniformity of the brightness of the backlight module in the thinned backlight module.
The reflectivity of the angle selection film 16 provided by the embodiment of the invention to 0-degree incident light is 70% -90%, and the reflectivity of the angle selection film 16 to 0-70-degree incident light is reduced in sequence, and the transmittance is improved in sequence.
Theoretically, the shielding layer 1223 is disposed on the light emitting surface of the light source 122 on the side away from the back plate 11, so that the light emitting angle of the light source 122 can be increased, and the irradiation range of a single light source 122 can be increased to the greatest extent by combining with the angle selection film 16, so as to further reduce the backlight H/P value. However, in practice, the shielding layer 1223 limits the intensity of light emitted from the light source 122, i.e., the small-angle light, and the reflectivity of the angle-selective film 16 to the small-angle light reaches 90%, so that the intensity of light emitted from the light source 122 is excessively reduced after the two are combined, and therefore, a shadow appears above the light source 122, which affects the display effect of the display device.
In view of this, the embodiments of the present invention are obtained through multiple optical simulation experiments: when the shielding layer 1223 includes a matrix and reflective particles, the content of the reflective particles and the reflectance of the angle-selective film with respect to 0 ° incident light satisfy the following relationship:
75％<(a+b)<115％
where a represents the content of the reflective particles, and b represents the reflectance of the angle selection film 16 with respect to 0 ° incident light; and the range of the content a of the reflective particles is 5% -25%, and the range of the reflectivity of the angle selection film 16 to 0 ° incident light is 70% -90%, so that the emergent light intensity at the top of the light source 122 can be weakened, the light-emitting angle of the light source 122 can be increased, and the phenomenon that the intensity of emergent light above the light source 122 is excessively reduced after the shielding layer 1223 is combined with the angle selection film 16, and the phenomenon that a black shadow appears above the light source 122 can be avoided. When the content a of the reflective particles and the reflectivity b of the angle selection film to 0 ° incident light satisfy the above relationship, the uniformity of the backlight light of the display device can be ensured, as shown in fig. 5, the light emitting range of the single light source 122 is increased from D1 to D2, and the H/P value is greatly reduced to below 0.2; the development requirement of thinning the display device is met on the premise of not increasing the manufacturing cost (not changing the number of the light sources 122).
If (a + b) >115%, the light intensity above the light source 122 is insufficient due to the shielding degree of the shielding layer 1223 and the reflectivity of the angle selection film 16 being too large, and a phenomenon of a dark shadow occurs; if (a + b) <75%, the lamp shadow phenomenon occurring after the reduction of the backlight H/P cannot be solved due to the insufficient shielding degree of the shielding layer 1223 and the reflectance of the angle selection film 16. Therefore, the embodiment of the present invention sets the content of the reflective particles a and the reflectance of the angle selection film 16 for 0 ° incident light to be in the range of 75% < (a + b) < 115%.
In the embodiment provided by the invention, the following formula fitting is carried out: the content of the reflective particles, the reflectivity of the angle selection film to 0-degree incident light, the light mixing distance and the spacing distance between two adjacent light sources satisfy the following relations:
Figure BDA0003090261680000141
where a denotes the content of reflective particles, B denotes the reflectance of the angle selection film with respect to 0 ° incident light, H denotes the light mixing distance (distance from the wiring layer to the lower surface of the diffuser plate), P denotes the spacing distance between two adjacent light sources, a denotes the concentration coefficient of the shielding layer 1223, and B denotes the reflectance coefficient of the angle selection film 16; the value range of the concentration coefficient A of the shielding layer 1223 is 6.8-7.0; the reflectance B of the angle selection film 16 ranges from 4.5 to 4.7. Therefore, the embodiment of the invention can adjust the light mixing distance and the spacing distance between two adjacent light sources according to the relationship, and meets the requirements of different display devices.
According to the first invention concept, the light-emitting surface of the light source on the side away from the back plate is provided with the shielding layer, and the shielding layer has a reflection effect on at least part of incident light and can weaken the emergent light intensity at the top of the light source; and when the light reflected by the shielding layer reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side face of the light source, so that the intensity of the light emitted from the side face of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the second inventive concept, the shielding layer can be a diffusion layer, the diffusion plate is internally provided with scattering particle materials, and light rays incident to the scattering particle materials can be continuously refracted and reflected, so that the effect of scattering the light rays is achieved, and the problem of partial brightness above the light source can be avoided; in addition, the light reflected to the bottom of the light source by the scattering particle material can be reflected again and finally emitted out from the side surface of the light source, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity of all positions in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the third inventive concept, the shielding layer comprises the matrix and the reflective particles, the reflective particles have a reflective effect on incident light, when the light is incident to the shielding layer, part of the incident light can be incident to the reflective particles and reflected by the reflective particles, so that the emergent light intensity at the top of the light source is reduced; and when the light reflected by the reflected particles reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the fourth inventive concept, the reflective particles may be titanium dioxide. When the content of the titanium dioxide provided by the invention is 30%, the H/P value can be reduced to about 0.5 from more than 0.6.
According to the fifth inventive concept, the backlight module further comprises an angle selection film, and the angle selection film can increase the reflection of light rays with an incident angle ranging from 0 to 70 degrees and increase the reflection of light rays with an incident angle ranging from 70 to 90 degrees. Although the light-emitting surface of the light source, which is away from the back plate, is provided with the shielding layer, the shielding layer has a reflection effect on at least part of incident light, but part of light with small angle still penetrates through the shielding layer. The angle selection film can increase the reflection of the small-angle light rays emitted through the shielding layer, the light rays are reflected to the direction of the lamp panel by the angle selection film, and the emitted large-angle light rays are increased in reflection; the small-angle light reflected to the lamp panel direction forms a part of large-angle light after being scattered or diffused by the reflecting layer, so that the small-angle light is reflected to the lamp panel direction to be emitted in an anti-reflection manner by the angle selecting film, the emergent intensity of the small-angle light close to the emergent center is reduced, the emergent intensity of the large-angle light far away from the emergent center is increased, the final emergent illumination is consistent, and the uniformity of light source emergent light is improved.
According to the sixth inventive concept, the following results are obtained through multiple times of optical simulation experiments: when the shielding layer comprises a matrix and reflective particles, the content of the reflective particles and the reflectivity of the angle selection film to 0 DEG incident light satisfy the following relation:
75％<(a+b)<115％
wherein a represents the content of the reflective particles, and b represents the reflectance of the angle selection film against 0 ° incident light; and when the content a of the reflective particles is in the range of 5% -25%, and the reflectivity of the angle selection film to 0-degree incident light is in the range of 70% -90%, the emergent light intensity at the top of the light source can be weakened, the light-emitting angle of the light source can be increased, and the phenomenon that the intensity of emergent light above the light source is excessively reduced after the shielding layer is combined with the angle selection film to cause a shadow above the light source can be avoided. When the content a of the reflective particles and the reflectivity b of the angle selection film to 0-degree incident light satisfy the relationship, the uniformity of backlight light emission of the display device can be ensured, the light emission range of a single light source is enlarged, and the H/P value is greatly reduced to be below 0.2.
According to the seventh inventive concept, the following is obtained by formula fitting: the content of the reflective particles, the reflectivity of the angle selection film to 0-degree incident light, the light mixing distance and the spacing distance between two adjacent light sources satisfy the following relations:
Figure BDA0003090261680000161
wherein, a represents the content of the reflective particles, B represents the reflectivity of the angle selection film to 0 degree incident light, H represents the light mixing distance (distance from the line layer to the lower surface of the diffusion plate), P represents the spacing distance between two adjacent light sources, A represents the concentration coefficient of the shielding layer, and B represents the reflectivity coefficient of the angle selection film; the value range of the concentration coefficient A of the shielding layer is 6.8-7.0; the angle selection film has a reflectance coefficient B in the range of 4.5 to 4.7. Therefore, the light mixing distance and the spacing distance between two adjacent light sources can be adjusted according to the relation, and the requirements of different display devices are met.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A display device, comprising:
a display panel for image display;
the backlight module is positioned on the light incident side of the display panel and used for providing backlight;
the backlight module comprises:
the back plate has supporting and bearing functions;
the lamp panel is positioned on one side of the backboard; the lamp panel comprises a light source;
and a light-emitting surface of one side of the light source, which is far away from the back plate, is provided with a shielding layer, and the shielding layer has a reflection effect on at least part of incident light.
2. The display device of claim 1, wherein the light panel further comprises:
the circuit board is positioned on the back plate and used for providing a driving signal; the light source is positioned on one side of the circuit board, which is far away from the back plate;
the reflecting layer is positioned on one side of the circuit board close to the light source; the reflective layer includes an opening for exposing the light source.
3. The display device of claim 2, wherein the light source further comprises:
the micro light-emitting diode is positioned on one side of the circuit board, which is far away from the back plate;
the packaging structure is positioned on the surface of the micro light-emitting diode and used for packaging and protecting the micro light-emitting diode;
the shielding layer is positioned on one side of the packaging structure, which is far away from the circuit board.
4. The display device according to any one of claims 1 to 3, wherein the backlight module further comprises:
an angle selection film positioned on the light emitting side of the light source; the angle selective film is used to increase reflection of light at incident angles of 0-70 degrees and to increase transmission of light at incident angles of 70-90 degrees.
5. The display apparatus of claim 4, wherein the angle-selective film has a reflectance of 70% to 90% for 0 ° incident light.
6. The display device according to claim 5, wherein the shielding layer comprises a matrix and reflective particles, and the reflective particles are present in an amount of 5% to 25%.
7. The display device according to claim 6, wherein the content of the reflective particles and the reflectance of the angle selection film for 0 ° incident light satisfy the following relationship:
75％<(a+b)<115％
wherein a represents the content of the reflective particles, and b represents the reflectance of the angle selection film with respect to 0 ° incident light.
8. The display device according to claim 6 or 7, wherein the reflective particles are titanium dioxide.
9. The display device according to claim 5, wherein the shielding layer is a diffusion layer.
10. The display device according to claim 6, wherein the content of the reflective particles, the reflectivity of the angle selective film to 0 ° incident light, the light mixing distance, and the spacing distance between two adjacent light sources satisfy the following relationships:
Figure FDA0003090261670000021
wherein a represents the content of the reflective particles, B represents the reflectivity of the angle selection film to 0 degree incident light, H represents the light mixing distance, P represents the spacing distance between two adjacent light sources, a represents the concentration coefficient of the shielding layer, and B represents the reflectivity coefficient of the angle selection film;
the value range of the concentration coefficient A of the shielding layer is 6.8-7.0; the value range of the reflectivity coefficient B of the angle selection film is 4.5-4.7.
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