CN113835263A - Direct type backlight module, display and terminal equipment - Google Patents
Direct type backlight module, display and terminal equipment Download PDFInfo
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- CN113835263A CN113835263A CN202010513734.5A CN202010513734A CN113835263A CN 113835263 A CN113835263 A CN 113835263A CN 202010513734 A CN202010513734 A CN 202010513734A CN 113835263 A CN113835263 A CN 113835263A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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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
- G02F1/133603—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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
本申请属于显示设备技术领域，尤其涉及一种直下式背光模组、显示器及终端设备，直下式背光模组包括PCB板、多个光源、耦光板和反射层，反射层设置于PCB板上，各光源设置于PCB板上，耦光板为透明树脂板，并设置于光源上方距各光源预设距离处，且耦光板对应各光源的位置开设有凹槽，凹槽内容置有反射体，以使得凹槽的槽壁形成有用于将对应的光源发出的至少部分光线反射至反射层上的反射面，并使得光源发出的光线依次经过反射面和反射层的反射后自上方射出。这样可以减少光源的数量，提升耦光板发光均匀性，进而，通过合理设置耦光板的结构，可在降低直下式背光模组的厚度的同时，减少光源的数量，也较佳地控制了直下式背光模组的制造成本。
The application belongs to the technical field of display devices, and in particular relates to a direct-type backlight module, a display and terminal equipment. The direct-type backlight module includes a PCB board, a plurality of light sources, a light coupling plate and a reflection layer, and the reflection layer is arranged on the PCB board. Each light source is arranged on the PCB board, the light coupling plate is a transparent resin plate, and is arranged above the light source at a preset distance from each light source, and the light coupling plate is provided with a groove at the position corresponding to each light source, and a reflector is placed in the groove to prevent The groove wall is formed with a reflective surface for reflecting at least part of the light emitted by the corresponding light source to the reflective layer, and the light emitted by the light source is sequentially reflected by the reflective surface and the reflective layer and then emitted from above. In this way, the number of light sources can be reduced, and the uniformity of light emission of the light coupling plate can be improved. Furthermore, by rationally setting the structure of the light coupling plate, the thickness of the direct-type backlight module can be reduced, and the number of light sources can be reduced, and the direct-type type can be better controlled. The manufacturing cost of the backlight module.
Description
Technical Field
The application belongs to the technical field of display equipment, especially, relate to a straight following formula backlight unit, display and terminal equipment.
Background
The backlight module is a key module of the lcd, and usually a plurality of light sources are disposed on the PCB, and provide illumination to the display module of the lcd through the light sources. In the prior art, to reduce the thickness of the lcd, the thickness of the backlight module is usually reduced, and when the thickness of the backlight module is reduced, the uniformity of the light emission is reduced, so the number of light sources in the backlight module needs to be increased. However, increasing the number of light sources will lead to a rise in the manufacturing cost of the backlight module.
Disclosure of Invention
An object of the embodiments of the present application is to provide a direct type backlight module, which aims to solve the technical problem of the direct type backlight module in the prior art that the thickness is reduced and the manufacturing cost is increased.
To achieve the above object, a first aspect: the direct type backlight module comprises a PCB (printed circuit board), a plurality of light sources, a light coupling plate and a reflecting layer, wherein the reflecting layer is arranged on the PCB, the light sources are arranged on the PCB and are exposed out of the reflecting layer, the light coupling plate is a transparent substrate and is arranged above the light sources at a preset distance from the light sources, a groove is formed in the position, corresponding to each light source, of the light coupling plate, a reflecting body is arranged in the groove, so that a reflecting surface used for reflecting at least part of light rays emitted by the corresponding light sources to the reflecting layer is formed on the groove wall of the groove, and at least part of light rays emitted by the light sources are emitted out from the upper side of the light coupling plate after being reflected by the reflecting surface and the reflecting layer in sequence.
When the direct type backlight module provided by the embodiment of the application works, part of light rays emitted by the light source arranged on the PCB penetrate through the light coupling plate to be emitted to the upper side of the light coupling plate, the reflecting surface is formed on the groove wall of the groove, so that part of light rays are reflected to the reflecting surface corresponding to the groove, the reflecting surface reflects the light rays to the direction of the PCB, and the PCB is covered with the reflecting layer, so that the reflecting layer can reflect the light rays to the upper side of the light coupling plate again, and the light rays can be emitted from the surrounding positions of the light source position on the light coupling plate after being reflected by the reflecting surface and the reflecting layer in a double way, so that the light emitting uniformity of the light coupling plate is improved, and compared with the scheme of densely distributing the light sources to ensure the uniformity, the embodiment can reduce the number of the light sources under the condition that the thickness of the backlight module is unchanged or similar to the direct type backlight module; under the unchangeable condition of light source quantity, also can promote the luminous homogeneity of light coupling plate, and then, through the structure of reasonable setting light coupling plate, can reduce straight following formula backlight unit's thickness when, reduce the quantity of light source, also controlled straight following formula backlight unit's manufacturing cost better.
Optionally, the upper surface of the light coupling plate is formed with reflective dots. The reflection site can be reflected the light that partial direct shot to the light coupling board like this to cooperate with the plane of reflection, further promote the reflectivity of the light that the light source sent, thereby promote the light-emitting homogeneity of light coupling board.
Optionally, the grooves are arranged in a horizontal row and a vertical row on the surface of the light coupling plate back to the PCB, two adjacent grooves in one row and two grooves corresponding to each other in the vertical direction in the adjacent row are surrounded to form a rectangular grid, and a plurality of reflective dots are distributed at the positions where the diagonals of the rectangular grid intersect.
Optionally, a plurality of reflective mesh points are distributed between every two adjacent grooves.
Optionally, the reflective mesh points and the reflector are both a mixture of titanium dioxide particles and silica gel. The titanium dioxide particles distributed in the silica gel can diversify the propagation paths of the light rays reflected and emitted from the reflecting surface and the reflecting dots, so that the scattering rate of the light rays is improved, and the light-emitting uniformity of the light coupling plate is improved.
Optionally, the titanium dioxide particles have a diameter of 100nm to 150 nm. This improves the uniformity and density of the distribution of the titanium dioxide particles in the silica gel or the like.
Optionally, the light coupling plate is made of a copolymer of polymethyl methacrylate and polystyrene.
Optionally, the groove has two groove walls disposed oppositely, the two groove walls are both formed with the reflecting surfaces, in a direction from the top of the groove to the bottom of the groove, the two reflecting surfaces extend from a position far away from the central axis of the groove along the height direction thereof toward a position close to the central axis, and edges of the two reflecting surfaces facing each other are connected. Therefore, the two reflecting surfaces form included angles with the vertical distance direction from the light source to the groove, and light rays emitted by the light source can be reflected to the reflecting layer from the two reflecting surfaces in different reflecting directions after reaching the two reflecting surfaces.
Optionally, the reflecting surface is a curved surface, and a concave direction formed by bending the reflecting surface faces the central axis; therefore, the surface area of the reflecting surface is increased, so that the reflecting surface can reflect more light rays, and the reflected light rays can be reflected to the reflecting layer as much as possible. Alternatively, the reflecting surface is a plane.
Optionally, the light source is an LED light source, the groove is an elongated groove, the two reflecting surfaces are formed on two opposite groove walls in the width direction of the groove, and the length direction of the groove is perpendicular to the length direction of the LED light source. Therefore, the reflection efficiency of the two reflecting surfaces to light rays is improved, and the light emitting uniformity of the light coupling plate is further improved.
Optionally, the groove is a tapered groove or a frustum-shaped groove.
Optionally, the cross-sectional shape of the groove is triangular or inverted trapezoidal.
Optionally, the ratio of the distance between two opposite sides of the top of the groove in the width direction of the groove to the vertical distance between the top of the groove and the bottom of the groove is 0.1-0.3. Therefore, the included angle of the reflecting surface formed on the groove wall of the groove relative to the central axis is within a reasonable range, and further the reflecting surface can form a reasonable angle relative to the vertical direction from the light source to the groove, so that the reflecting surface can reflect light rays emitted by the light source as much as possible.
Optionally, the reflective dots and the reflector are printed on the surface of the light coupling plate and in the corresponding grooves respectively by screen printing;
or the reflective dots are sprayed on the surface of the light coupling plate, and the reflector is arranged in the corresponding groove through dispensing.
Optionally, the surface of the light coupling plate facing the light source protrudes to form a plurality of pillars, and the pillars pass through the reflective layer and are disposed on the PCB.
Optionally, each of the pillars is fixed on the PCB by gluing. Due to the existence of the stand columns, on one hand, the light coupling plate is arranged on the PCB through the stand columns, on the other hand, the light coupling plate can be suspended relative to the PCB through the stand columns, and a light mixing distance is formed between the light coupling plate and the PCB at intervals.
Optionally, the height of each upright post is 0.1mm to 0.3 mm.
Optionally, the diameter of each upright post is 0.5 mm-2 mm.
Optionally, the light output direction of the light coupling plate is provided with a diffusion sheet. The light rays which are emitted out of the light coupling plate can be reflected and refracted again under the action of the diffusion sheet, so that the diffusion effect of the light rays is further improved, and the integral light emitting uniformity of the direct type backlight module is further improved.
In a second aspect: a display is provided, which comprises the direct type backlight module and the display module.
The display that this application embodiment provided, owing to including foretell straight following formula backlight unit, and foretell straight following formula backlight unit passes through the cooperation of reflection stratum and plane of reflection, realized the dual reflection of light in straight following formula backlight unit, and then in control light source quantity, the luminous homogeneity of light coupling plate has also been promoted, in the thickness that reduces straight following formula backlight unit, the manufacturing cost of straight following formula backlight unit has also been controlled better, so also in the whole thickness that reduces the display, the manufacturing cost of display has also been reduced, the display quality of display has been promoted.
In a third aspect: a terminal device is provided, which comprises the display.
The terminal device provided by the embodiment of the application comprises the display, and the display can reduce the whole thickness and the manufacturing cost of the display, so that the whole manufacturing cost of the terminal device is also reduced.
Drawings
FIG. 1 is a prior art drawing;
fig. 2 is a schematic structural diagram of a direct type backlight module according to an embodiment of the present disclosure;
fig. 3 is a partial cross-sectional view of a first light coupling plate of a direct type backlight module according to an embodiment of the present disclosure;
fig. 4 is a partial cross-sectional view of a second light coupling plate of a direct type backlight module according to an embodiment of the present disclosure;
fig. 5 is a partial cross-sectional view of a direct type backlight module according to an embodiment of the present disclosure when a light coupling plate and a reflector are combined;
fig. 6 is a first top view of a light coupling plate of a direct-type backlight module according to an embodiment of the present disclosure;
fig. 7 is a second top view of a light coupling plate of a direct-type backlight module according to an embodiment of the present disclosure;
fig. 8 is a simulation diagram of optical paths of a light source of a direct-type backlight module according to an embodiment of the present disclosure;
fig. 9 is a distribution diagram of radiation illuminance formed by a light source of a direct type backlight module according to an embodiment of the present disclosure;
fig. 10 is an illuminance gradient diagram of a light source of a direct-type backlight module according to an embodiment of the present disclosure.
Wherein, in the figures, the respective reference numerals:
10-direct type backlight module 11-PCB 12-light source
13 coupling light plate 14 reflecting layer 15 groove
16-reflection dot 17-diffusion sheet 18-ink layer
131-column 151-reflector 152-reflecting surface
153-central axis 154-titanium dioxide particles 155-silica gel.
Detailed Description
For convenience of understanding, technical terms related to the present application are explained and described below.
Reflection: an optical phenomenon. Refers to a phenomenon that when light propagates from a first medium to a second medium, the propagation direction is changed at the interface between the first medium and the second medium and the light returns to the first medium.
Refraction: when light obliquely enters another medium from one medium, the propagation direction changes.
Refractive index: the ratio of the propagation speed of light in a vacuum to the propagation speed of light in the medium is called the refractive index of the medium. The higher the refractive index of the material, the greater the ability to refract incident light.
Reflectance ratio: the percentage of radiant energy reflected by an object to the total radiant energy directed to the object is called the reflectivity.
PMMA: polymethyl-methacrylate (pmma), an important thermoplastic, has good chemical stability, transparency and weatherability, and is easy to process.
PS: polystyrene (polystyrene) polystyrene, which is a polymer synthesized by radical addition polymerization of styrene monomer, has better transparency.
MS: (methyl methacrylate-styrene copolymer) polymethyl methacrylate and polystyrene.
Illumination degree: luminescence refers to the luminous flux of visible light received per unit area, abbreviated as illuminance, in lux.
Light mixing distance: in the direct-type backlight module 10, the distance required for uniformly mixing the light emitted from the light source 12 before reaching the light coupling plate is, for the LED backlight system in the embodiment of the present application, the light is uniformly mixed and covers the diffusion plate, and the light mixing distance is the distance between the PCB 11 carrying the LED light source 12 and the light coupling plate 13.
A light coupling plate: in the direct type backlight module 10, the existing transparent resin plate in the direct type backlight module 10 is modified and disposed above the light sources 12 at a predetermined distance from the light sources 12, the transparent resin plate is provided with grooves 15 at positions corresponding to the light sources 12, and the reflectors 151 are disposed in the grooves 15 to form the light coupling plate 13. Thus, the groove wall of the groove 12 forms the reflection surface 152, so that at least part of the light emitted by the light source 12 is emitted from the top of the self-coupling light plate 13 after being reflected by the reflection surface 152 and the reflection layer 14 in sequence, thereby improving the light diffuse reflection performance of the direct-type backlight module 10.
As shown in fig. 1, which is a schematic structural view of a direct type backlight module in the prior art, it can be known that an ink layer 18 is disposed on a PCB of the direct type backlight module, a light source is disposed on the ink layer 18, and light emitted from the light source is directly emitted to the outside through a light coupling plate and a diffusion plate.
As shown in fig. 2 to 4, the present embodiment provides a direct type backlight module 10, a display and a terminal device, wherein the direct type backlight module 10 is applied to a display, the display is applied to the terminal device, the display is specifically an LCD display, the terminal device includes but is not limited to a tablet computer, a notebook computer, a television, a vehicle-mounted display device, an ultra-mobile personal computer (UMPC), a netbook, or a Personal Digital Assistant (PDA) having an LCD display, and the present embodiment does not limit the specific type of the terminal device.
Specifically, as shown in fig. 2, the direct type backlight module 10 includes a PCB 11, a plurality of light sources 12, a light coupling plate 13 and a reflective layer 14. The light source 12 may be considered as a point light source 12, the reflective layer 14 is disposed on the PCB 11, and the reflective layer 14 may be a reflective sheet fixed on the PCB 11 by gluing or welding, or a reflective material may be directly coated on the PCB 11 to form the reflective layer 14. The reflective sheet may be a foamed PET film filled with bubbles for reflecting light or a metal reflective sheet (e.g., a silver-plated reflective sheet).
Each light source 12 is disposed on the PCB 11 and exposed to the reflective layer 14, the reflective layer 14 may be formed with a plurality of light passing openings, each light source 12 is exposed to each light passing opening, the light coupling plate 13 is a transparent resin plate, so that the light coupling plate 13 may be modified and prepared by using the existing transparent substrate in the direct-type backlight module, thereby reducing the manufacturing cost of the light coupling plate 13, the light coupling plate 13 is disposed above the light source 12 at a predetermined distance from each light source, so that a certain light mixing distance may be formed between the light coupling plate 13 and each light source 12, and further improving the light emitting uniformity of the light coupling plate 13.
As shown in fig. 3 and 4, the light coupling plate 13 is provided with a groove 15 at a position corresponding to each light source 12, and a reflector 151 is disposed in the groove 15, so that a reflective surface 152 for reflecting at least part of the light emitted by the corresponding light source 12 onto the reflective layer 14 is formed on a groove wall of the groove 15, and at least part of the light emitted by the light source 12 is emitted from above the light coupling plate 13 after being reflected by the reflective surface 152 and the reflective layer 14 in sequence.
The following further describes the direct-type backlight module 10 provided in the embodiment of the present application: in the direct-type backlight module 10 according to the embodiment of the present application, when the direct-type backlight module 10 works, a part of light emitted from the light source 12 disposed on the PCB 11 passes through the light coupling plate 13 and is emitted to the top of the light coupling plate 13, unlike the prior art shown in fig. 1, by forming the reflective surface 152 on the groove wall of the groove 15, such that a part of light can be reflected to the reflective surface 152 corresponding to the groove 15, the reflective surface 152 reflects the light to the direction of the PCB 11, and the reflective layer 14 is disposed on the PCB 11, such that the reflective layer 14 can re-reflect the light to the top of the light coupling plate 13, and the light can be emitted from the light coupling plate 13 at a position around the position corresponding to the light source 12 after double reflection of the reflective surface 152 and the reflective layer 14, such that the light uniformity of the light coupling plate 13 is improved, and at the same time, when the light emitted from the light source 12 reaches the bottom surface of the light coupling plate 13, a part of the light can be reflected by the bottom surface of the light coupling plate 13, the light is reflected to the reflective layer 14, so that the uniformity of the light emitted by the light coupling plate 13 is further improved, and thus, compared with the scheme of densely distributing the light sources to ensure the uniformity, the embodiment can reduce the number of the light sources 12 under the condition that the thickness of the direct type backlight module 10 is not changed or is similar; under the condition of keeping the quantity of the light sources 12 unchanged, the light-emitting uniformity of the light coupling plate 13 can be improved, and further, the thickness of the direct type backlight module 10 can be reduced by reasonably arranging the structure of the light coupling plate 13, the quantity of the light sources 12 is reduced, and the manufacturing cost of the direct type backlight module 10 is preferably controlled.
The display that this application embodiment provided, owing to including foretell straight following formula backlight unit 10, and foretell straight following formula backlight unit 10 passes through the cooperation of reflection stratum 14 and reflecting surface 152, the double reflection of light in straight following formula backlight unit 10 has been realized, and then when controlling light source 12 quantity, the luminous homogeneity of light coupling plate 13 has also been promoted, when reducing straight following formula backlight unit 10's thickness, also the manufacturing cost of straight following formula backlight unit 10 has been controlled better, so also when reducing the whole thickness of display, the manufacturing cost of display has also been reduced, the display quality of display has been promoted.
The terminal device provided by the embodiment of the application comprises the display, and the display can reduce the whole thickness and the manufacturing cost of the display, so that the whole manufacturing cost of the terminal device is also reduced.
In other embodiments of the present application, as shown in fig. 2, 6 and 7, the surface of the light-coupling plate 13 facing away from the light source 12 is formed with reflective dots 16. Specifically, the reflective dots 16 are formed on the upper surface of the light coupling plate 13, so that the reflective dots 16 can reflect part of light directly emitted to the light coupling plate 13 in multiple directions, and are matched with the reflective surface 152, so that the light-emitting uniformity of the light coupling plate 13 is further improved.
Meanwhile, the reflective dots 16 can also perform a third reflection on the light that has undergone a second reflection by the reflective surface 152 and the reflective layer 14, so as to further improve the uniformity of the light emitted from the light-coupling plate 13.
In other embodiments of the present application, as shown in fig. 7, the grooves 15 are arranged in a horizontal row and a vertical row on the surface of the light coupling plate 13 facing away from the PCB 11, two adjacent grooves 15 in one row and two corresponding grooves 15 in the adjacent row along the vertical direction are enclosed to form a rectangular grid, and a plurality of reflective dots are distributed at the positions where the diagonals of the rectangular grid intersect. Therefore, the phenomenon of insufficient light uniformization at the diagonal intersection can be compensated.
In other embodiments of the present application, as shown in fig. 6 and 7, a plurality of reflective dots 16 are distributed between two adjacent grooves 15. Specifically, a plurality of reflective dots 16 are uniformly distributed between two adjacent grooves 15, so that the reflective dots 16 can make up for the defect that the light uniformizing effect of the gap region between the two grooves 15 is not ideal, and the uniform effect of the light emitted by the light source 12 is improved.
In other embodiments of the present application, as shown in fig. 5, the reflective dots 16 and the reflector 151 are each a mixture of titanium dioxide particles 154 and silica gel 155. Specifically, the titanium dioxide particles 154 distributed in the silica gel 155 can diversify the propagation paths of the light rays reflected and emitted from the reflective surface 152 and the reflective dots 16, so as to improve the scattering rate of the light rays, thereby improving the uniformity of the light output of the light coupling plate 13.
In other embodiments of the present application, the refractive index of the titanium dioxide particles 154 is 2.25 to 2.55, and the refractive index of the silica gel 155 is 1.5 to 1.6. Specifically, by the above arrangement, the overall refractive index of the reflector 151 and the reflective dots 16 is increased, so that light can be more easily reflected to the reflective layer 14 at the reflective surface 152 and the reflective dots 16 rather than being directly refracted to the outside of the light coupling plate 13 from the reflector 151 and the reflective dots 16, thereby improving the uniformity of light output from the light coupling plate 13.
In other embodiments of the present application, the titanium dioxide particles 154 have a diameter of 100nm to 150 nm. Specifically, the titanium dioxide particles 154 are set to have a diameter of 100nm to 150nm, so that the distribution uniformity and density of the titanium dioxide particles 154 in the silica gel 155 and the like are improved, the propagation paths of the light reflected and emitted from the reflecting surface 152 and the reflective dots 16 are diversified, the scattering rate of the light is further improved, the light-emitting uniformity of the light-coupling plate 13 is further improved, and the dispersion phenomenon of the light-coupling plate 13 is also avoided.
Alternatively, the diameter of the titanium dioxide particles 154 is 120nm to 130nm, and by further limiting the diameter of the titanium dioxide particles 154 to 120nm to 130nm, a balance is maintained between the uniformity of the distribution of the titanium dioxide particles 154 in the silica gel 155 and the production cost of the titanium dioxide particles 154, so that the titanium dioxide particles 154 have better uniformity of distribution, and the increase of the production cost of the titanium dioxide particles 154 due to too small size is avoided.
In other embodiments of the present application, the light coupling plate 13 is manufactured from a copolymer (MS) of Polymethylmethacrylate (PMMA) and Polystyrene (PS). Specifically, the light coupling plate 13 is made of a resin plate made of a copolymer of polymethyl methacrylate and polystyrene, so that the light coupling plate 13 has the advantages of high light transmittance, low manufacturing cost, easy machining and certain toughness due to the polymethyl methacrylate material, and low manufacturing cost due to the high light transmittance and low manufacturing cost of polystyrene, so that the light transmittance of the light coupling plate 13 is ensured, the toughness of the light coupling plate 13 is improved, and the manufacturing cost of the light coupling plate 13 is reduced.
In other embodiments of the present application, as shown in fig. 3 and 4, the groove 15 has two opposite groove walls, each of the two groove walls has a reflective surface 152 formed thereon, each of the two reflective surfaces 152 extends from a position away from a central axis 153 of the groove 15 in a height direction thereof toward a position close to the central axis 153 in a direction from a top of the groove 15 toward a bottom of the groove 15, and edges of the two reflective surfaces 152 facing each other meet.
Specifically, the reflecting surfaces 152 are formed on the two opposite groove walls of the groove 15, and the two reflecting surfaces 152 extend from the position away from the central axis 153 of the groove 15 to the position close to the central axis 153, so that the two reflecting surfaces 152 form an included angle with the vertical distance direction from the light source 12 to the groove 15, and after the light emitted by the light source 12 reaches the two reflecting surfaces 152, the light can be reflected to the reflecting layer 14 from the two reflecting surfaces 152 in different reflecting directions, so that the reflecting paths of the light are enriched, and the light-emitting uniformity of the light-coupling plate 13 is improved. Through making two plane of reflection 152 interconnect, can not have hole or gap between two plane of reflection 152 like this, so light source 12 sent big-angle light and small-angle light just can fully reflect to two plane of reflection 152 on, and then promoted two plane of reflection 152 reflection efficiency to light to straight following formula backlight unit's luminous softness has been promoted.
As shown in fig. 5, the two opposite walls of the groove 15 may be vertically and obliquely arranged, the oblique walls of two adjacent grooves 15 are oppositely inclined, and the reflective surface 152 may be formed on the obliquely arranged walls.
In other embodiments of the present application, as shown in fig. 4, the reflecting surface 152 is a curved surface, and a concave direction formed by bending the reflecting surface 152 is toward the central axis 153, that is, a middle portion of the curved surface is concave toward the central axis; alternatively, the reflective surface 152 is planar.
Specifically, the reflecting surface 152 is set to be a curved surface, and the concave direction formed by bending the reflecting surface 152 is back to the central axis 153, so that the surface area of the reflecting surface 152 is increased, the reflecting surface 152 can reflect light more, and the reflected light can be reflected to the reflecting layer 14 as much as possible and then reflected from the reflecting layer 14 to the light coupling plate 13, so that the light emitted by the light source 12 can be emitted from the top of the light coupling plate 13 as much as possible, and thus the utilization rate of the light emitted by the light source 12 is improved.
By setting the reflecting surface 152 to be a flat surface, the molding complexity of the reflecting surface 152 is reduced, thereby reducing the molding difficulty of the reflecting surface 152 and further reducing the manufacturing cost of the light coupling plate 13.
In other embodiments of the present application, as shown in fig. 6 and 7, the light source 12 is an LED light source, the groove 15 is a long groove, the two reflecting surfaces 152 are formed on two opposite groove walls in the width direction of the groove 15, the LED light source may be rectangular, and the length direction of the groove 15 and the length direction of the LED light source are perpendicular to each other.
Specifically, the two reflecting surfaces 152 are formed on the two opposite groove walls in the width direction of the groove 15, and the length direction of the LED light source is perpendicular to the length direction of the groove 15, so that the light emitted by the LED light source can cover the area in the width direction of the groove 15 as much as possible, and the light emitted by the LED light source can cover the two reflecting surfaces 152 as much as possible, so that the reflection efficiency of the two reflecting surfaces 152 on the light is improved, and further the light-emitting uniformity of the light coupling plate 13 is improved.
In other embodiments of the present application, the recess 15 is a tapered or frustoconical recess. Specifically, the reflective surface 152 formed on the groove wall of the groove 15 is an arc surface, so that the light can be reflected to the circumferential region of the groove 15, and the uniformity of the light output of the light coupling plate 13 can also be improved.
In other embodiments of the present application, as shown in FIG. 3, the cross-sectional shape of the groove 15 is triangular or inverted trapezoidal. Specifically, by defining the cross-sectional shape of the groove 15 as a triangle or an inverted trapezoid, it is convenient that the two reflecting surfaces 152 are formed on the opposite groove walls of the groove 15.
Optionally, the triangle is an isosceles or equilateral triangle, or the inverted trapezoid is an isosceles trapezoid, so that the two reflective surfaces 152 formed in this way can be arranged symmetrically to the central axis 153 of the groove 15, and the central axis 153 passes through the center of the corresponding light source 12, so that the light emitted from the light source 12 can be reflected symmetrically from the two reflective surfaces 152 to the reflective layer 14, thereby further improving the uniformity of the light output of the light coupling plate 13.
In other embodiments of the present application, a ratio of a distance between opposite sides of the top of the groove 15 in a width direction thereof (a maximum width of the groove 15) to a vertical distance between the top of the groove 15 and the bottom of the groove 15 (a depth of the groove 15) is 0.1 to 0.3. Specifically, by setting the ratio of the two distances to 0.1 to 0.3, the included angle of the reflection surface 152 formed on the groove wall of the groove 15 with respect to the central axis 153 is within a reasonable range, so that the reflection surface 152 can form a reasonable angle with respect to the vertical direction from the light source 12 to the groove 15, and the reflection surface 152 can reflect light emitted from the light source 12 as much as possible.
In other embodiments of the present application, the reflective dots 16 and the reflectors 151 are printed on the surface of the light coupling plate 13 and in the corresponding grooves 15 by silk-screen printing; alternatively, the reflective dots 16 are sprayed on the surface of the light coupling plate 13, and the reflective dots 151 are dispensed and cured in the corresponding grooves 15.
Specifically, the reflective dots 16 and the reflector 151 are formed by screen printing in one step, so that the efficiency of forming the reflective dots 16 and the reflector 151 on the light coupling plate 13 is improved, and the manufacturing efficiency of the direct type backlight module 10 is also improved.
And the reflective dots 16 are dispensed and cured in the corresponding grooves 15 by spraying the reflective dots 16 on the upper surface of the light coupling plate 13. Thus, the reflective dots 16 and the reflector 151 can be differentiated. Therefore, the reflecting surface 152 formed by the reflector 151 accommodated in the groove 15 and the reflective dots 16 have different reflection efficiencies to light, and the reflecting surface 152 with high reflection efficiency and low distribution can realize mixed distribution with the reflective dots 16 with relatively low reflection efficiency and high distribution density, thereby improving the overall light-emitting uniformity of the light-coupling plate 13.
In other embodiments of the present application, as shown in fig. 2, the surface of the light coupling plate 13 facing the light source 12 is formed with a plurality of posts 131, and the posts 131 penetrate the reflective layer 14 and are disposed on the PCB 11. Specifically, due to the existence of the pillars 131, on one hand, the light coupling plate 13 is disposed on the PCB 11 through the pillars 131, and on the other hand, the light coupling plate can be suspended from the PCB 11 through the pillars 131, so as to form a light mixing distance with the PCB 11.
In other embodiments of the present application, the posts 131 are fixed to the PCB board 11 by gluing. Specifically, the posts 131 may be adhered and fixed on the PCB 11 by uv (ultraviolet) glue or thermosetting glue to improve the connection strength between the light coupling plate 13 and the PCB 11.
In other embodiments of the present application, the height of the post 131 is 0.1mm to 0.3 mm. Specifically, by limiting the height of the pillar 131 to 0.1mm to 0.3mm, the distance between the light-coupling plate 13 and the PCB 11 is also maintained to 0.1mm to 0.3mm, so that there is a sufficient light mixing distance between the light source 12 and the light-coupling plate 13, thereby improving the uniformity of the light emitted from the light-coupling plate 13.
Optionally, the height of each of the pillars 131 is 0.2mm, so that on one hand, a sufficient light mixing distance exists between the light source 12 and the light coupling plate 13, and on the other hand, the distance of the light coupling plate 13 relative to the PCB 11 is also controlled, and further, while the sufficient light mixing distance is maintained, the control of the overall thickness of the direct backlight module 10 is also considered.
In other embodiments of the present application, the diameter of the post 131 is 0.5mm to 2 mm. Specifically, by limiting the diameters of the columns 131 to 0.5mm to 2mm, each column 131 has sufficient support strength, and stable support of the light coupling plate 13 can be achieved.
Optionally, the diameter of each pillar 131 is defined as 1mm, so that the diameter of the pillar 131 is controlled while the light coupling plate 13 is stably supported, and the pillar 131 is prevented from occupying too much assembly space on the PCB 11, so that more assembly space can be reserved on the PCB 11 for the light source 12.
In other embodiments of the present application, as shown in fig. 2, the light output direction of the light coupling plate 13 is provided with a diffusion sheet 17. Specifically, by arranging the diffusion sheet 17, the light exiting the light coupling plate 13 is reflected and refracted again under the action of the diffusion sheet 17, so as to further improve the diffusion effect of the light, and thus further improve the overall light-emitting uniformity of the direct-type backlight module 10.
As shown in fig. 7 and 8, the present embodiment performs simulation verification that every four LED light sources are vertically arranged, and the distance between two adjacent LED light sources in the vertical direction is 3mm, the distance between two adjacent LED light sources in the transverse direction is 10mm, the length and width dimensions of the LED light sources are respectively 0.5mm and 0.15mm, the thickness of the PCB 11 is 0.3mm, the thickness of the light coupling plate 13 is 0.7mm, the thickness of the diffusion sheet 17 is 0.2mm, when the ratio of the distance between the two opposite sides of the top of the groove 15 along the width direction thereof to the distance between the top of the groove 15 and the bottom of the groove 15 is 0.2, the simulation diagram of the optical path simulation is shown in fig. 8, referring to fig. 9, in the diagram, every four LED light sources vertically arranged can form a uniform surface light source 12 with a transverse width of 10mm ± 2mm and a vertical width of 10mm ± 2mm, referring to fig. 10, the maximum illumination of the formed uniform surface light source 12 is 0.06 lux.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (21)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010513734.5A CN113835263A (en) | 2020-06-08 | 2020-06-08 | Direct type backlight module, display and terminal equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010513734.5A CN113835263A (en) | 2020-06-08 | 2020-06-08 | Direct type backlight module, display and terminal equipment |
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Application publication date: 20211224 |