CN109976036A - A kind of optical diaphragm, backlight module and display device - Google Patents
A kind of optical diaphragm, backlight module and display device Download PDFInfo
- Publication number
- CN109976036A CN109976036A CN201910262183.7A CN201910262183A CN109976036A CN 109976036 A CN109976036 A CN 109976036A CN 201910262183 A CN201910262183 A CN 201910262183A CN 109976036 A CN109976036 A CN 109976036A
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- light
- light source
- optical diaphragm
- basement membrane
- lattice point
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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
- G02F1/133606—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)
- Planar Illumination Modules (AREA)
Abstract
This application provides a kind of optical diaphragm, backlight module and display devices, and incident ray is reflected and transmitted by the sunk structure on second surface, to reduce the brightness of light source placement region；The light reflexed in basement membrane is transmitted in basement membrane, the light being incident on lattice point structure is scattered by the lattice point structure of non-light source placement region on first surface, and the region outgoing from second surface in addition to sunk structure, to promote the brightness of non-light source placement region, uniform area source can be formed in this way, reduce the mixed light height of directly-down light source, eliminate lamp shadow, promote light efficiency, realize the ultrathin of direct-type backlight, light utilization efficiency is improved, the power consumption of directly-down light source is reduced.
Description
Technical field
The present invention relates to field of display technology, more particularly to a kind of optical diaphragm, backlight module and display device.
Background technique
The backlight of liquid crystal display is divided into side entering type and straight-down negative, and the side LED passes through light guide plate to light out in side entrance back
Uniform area source is formed with reflector plate structure.LED directly forms area source in array fashion in direct-type backlight, at present
Direct-type backlight mainly uses miniLED, and having can be achieved high dynamic range and show the advantage of (HDR), but direct-type backlight
Main problem is that there are the lamp shadows of miniLED array.
At present in the large scales display field such as TV or display, the method for eliminating lamp shadow is to increase on each miniLED
Lens packages etc. increase the light radiation angle of miniLED, while increasing light mixing distance and cooperate diffusion barrier, and effect is limited and mould
Group thickness is larger.For the small sizes display field such as mobile phone, miniLED size, between several millimeters, mounts micro- in several hundred microns
Lens cost is very high, and the method for eliminating lamp shadow mainly increases light mixing distance and increases multiple diffusion barriers, equally causes mould group
Thickness increases, and is unable to satisfy user for the demand of fuselage ultrathin, and multilayer diffusion barrier will cause biggish light loss.
Summary of the invention
The present invention provides a kind of optical diaphragm, backlight module and display device, to reduce light mixing distance and promote light efficiency.
To solve the above-mentioned problems, the invention discloses a kind of optical diaphragms, and the optical diaphragm includes: basement membrane, described
Basement membrane has opposite first surface and second surface, and the first surface has light source placement region, on the first surface
Region in addition to the light source placement region is provided with multiple lattice point structures, and the lattice point structure will be for that will be incident to the net
Light in point structure is scattered；
Sunk structure corresponding with the light source placement region is provided on the second surface, the sunk structure is used for
The light being incident on the sunk structure is reflected and transmitted.
Optionally, the lattice point structure is pyramid site, recessed net point or convex net point.
Optionally, the diameter of the lattice point structure is greater than or equal to 5 μm, and is less than or equal to 10 μm.
Optionally, the sunk structure is recessed tetragonous wimble structure, recessed conical structure or concave spherical surface structure.
Optionally, the thickness of the basement membrane is greater than or equal to 200 μm, and is less than or equal to 300 μm.
Optionally, the surface of the sunk structure is equipped with the first reflecting layer, and first reflecting layer has default transmitance.
Optionally, the default transmitance is greater than or equal to 30%, and is less than or equal to 60%.
Optionally, the side of the basement membrane is equipped with the second reflecting layer.
To solve the above-mentioned problems, the invention also discloses a kind of backlight modules, including optics described in any embodiment
Diaphragm.
To solve the above-mentioned problems, the invention also discloses a kind of display devices, including back described in the embodiment of the present application
Optical mode group.
Compared with prior art, the present invention includes the following advantages:
Technical solution provided by the present application, by the sunk structure on second surface to incident ray carry out reflection and thoroughly
It penetrates, to reduce the brightness of light source placement region；The light reflexed in basement membrane is transmitted in basement membrane, passes through first surface
The lattice point structure of upper non-light source placement region is scattered the light being incident on lattice point structure, and except recessed from second surface
The region outgoing except structure is fallen into, to promote the brightness of non-light source placement region, uniform area source can be formed in this way, dropped
The mixed light height of low directly-down light source eliminates lamp shadow, promotes light efficiency, realizes the ultrathin of direct-type backlight, improves light utilization efficiency,
Reduce the power consumption of directly-down light source.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 shows a kind of the schematic diagram of the section structure of optical diaphragm provided by the embodiments of the present application；
Fig. 2 shows the schematic diagram of the section structure of another optical diaphragm provided by the embodiments of the present application；
Fig. 3 shows a kind of the schematic diagram of the section structure of backlight module provided by the embodiments of the present application；
Fig. 4 shows the optical diaphragm simulation model schematic diagram established in lighttools software；
Fig. 5 shows the lighttools simulation for carrying the miniLED backlight illumination of optical diaphragm provided in this embodiment
As a result；
Fig. 6 shows the lighttools mould for not carrying the miniLED backlight illumination of optical diaphragm provided in this embodiment
Quasi- result.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
One embodiment of the application provides a kind of optical diaphragm, and referring to Figures 1 and 2, which may include: basement membrane
10, basement membrane 10 has opposite first surface and second surface.
First surface has light source placement region 101, the region setting on first surface in addition to light source placement region 101
There are multiple lattice point structures 102, lattice point structure 102 is for the light being incident on lattice point structure 102 to be scattered.
Sunk structure 103 corresponding with light source placement region 101 is provided on second surface, sunk structure 103 is used for will
The light being incident on sunk structure 103 is reflected and is transmitted.
Wherein, lattice point structure 102 can be recessed net point (as shown in Figure 1), pyramid site (as shown in Figure 2) or convex net
The structure that point etc. can be scattered the light being incident to thereon.The diameter of lattice point structure 102 can be greater than or equal to 5 μm,
And it is less than or equal to 10 μm.
Sunk structure 103 can be recessed tetragonous wimble structure (as shown in Figure 1), recessed conical structure or concave spherical surface structure (such as Fig. 2
It is shown) etc. light can be reflected and be transmitted (refraction), that is, change the light direction of propagation structure.
Light source placement region 101 can carry out matching according to actual light source form etc. and set for placing light source, shape
Meter, such as can be such as Fig. 1 and groove structure shown in Figure 2.
The thickness of basement membrane 10 can be greater than or equal to 200 μm, and be less than or equal to 300 μm.The material of basement membrane 10 can be
PT, PC or PMMA etc. can be used as the material of light guide plate.
Below with lattice point structure 102 as shown in Figure 1 for recessed net point, sunk structure 103 is for recessed tetragonous wimble structure
It is illustrated.
In practical applications, referring to Fig. 3, light source 11 is mounted on lamp plate 12, and optical diaphragm provided in this embodiment is placed
In the top of lamp plate 12, light source placement region 101 and 11 Matching installation of light source.Wherein, light source 11 can be miniLED,
MiniLED is uniformly arranged on lamp plate 12 with a fixed spacing, and MiniLED shines for lambert's body, i.e., in the side perpendicular to light-emitting surface
There is highest light intensity upwards.Lamp plate 12 installs position even spread white ink of the side in no lamp of light source 11, white ink tool
There is certain reflectivity to can be used as high-reflecting film.
Each light source 11 is that a sunk structure 103 such as recessed rectangular pyramid, sunk structure 103 are correspondingly arranged above miniLED
Light source placement region 101 can be covered in the orthographic projection of first surface, it in this way can be to avoid 101 brightness of light source placement region too
It is high.Lateral dimension, cup depth and surface gradient angle of sunk structure 103 etc. can be according to practical even light effects etc. really
Fixed, the application is not construed as limiting this.
103 effect of sunk structure first is that by total reflection principle, a part of incident ray is transmitted into a part of incident light
Line total reflection reduces miniLED lamp position and sets place's (light source placement region to disperse miniLED in the light intensity perpendicular to light-emitting surface
101) emitting brightness；Another effect is to make this part light in base by total reflection principle, the propagation angle of changing section light
It is totally reflected in film 10, reduces the waste for avoiding light energy while brightness.
Reflection of the sunk structure 103 to miniLED vertical exit light in order to further increase, can be in sunk structure 103
Surface 104 plate the first reflecting layer, the first reflecting layer has default transmitance.Wherein presetting transmitance can be greater than or equal to
30%, and it is less than or equal to 60%.The default transmitance in the first reflecting layer can be adjusted according to practical even light effect.For example, working as
When even light effect is poor, the default transmitance can be properly increased.
The light a part transmission (refraction) being incident on sunk structure 103 goes out basement membrane 10, a part total reflection or reflection
To basement membrane 10, it is totally reflected in film layer.
The first surface of basement membrane 10 has equally distributed lattice point structure 102, and the diameter of lattice point structure 102 can enter with side
The site of formula light guide plate is similar, and diameter is set as 5 microns~10 microns, with certain density arrangement.The effect of lattice point structure 102
Are as follows: it scatters when the light in film layer is incident on lattice point structure 102, and then is emitted from the second surface of basement membrane 10, in this way
Recessed rectangular pyramid can be made full use of to be reflected into the light in film, make dark space (the non-light source rest area originally without miniLED lamp
Domain) output intensity and the output intensity of the area miniLED (light source placement region 101) that generate approach or identical, under human eye vision
Available uniform area source light distribution.
The side 105 of basement membrane 10 can plate the second reflecting layer, can prevent the light of 10 inner total reflection of basement membrane from side in this way
Outgoing leads to light loss.
The light mixing distance of directly-down light source can be effectively reduced in optical diaphragm provided in this embodiment, only needs one layer of lamp plate
And optical diaphragm provided by the present application can be used as direct-type backlight, while can reduce the use of diffusion barrier, make entirely be
The theoretical light utilization efficiency of system is 100%.
Inventor carries the brightness point of the miniLED backlight of optical diaphragm provided by the present application using lighttools simulation
Cloth, by taking the miniLED array of 5 × 5 0.5mm × 5mm sizes as an example, analogue mobile phone mould group miniLED lamp spacing is 1.2mm,
Receiver is placed in 10 second surface of basement membrane, establishes model in lighttools as shown in figure 4, obtained outgoing Luminance Distribution
As shown in figure 5, essentially eliminating lamp shadow, effect is obvious, and homogeneity is good, i.e., light mixing distance be equal to basement membrane 10 thickness, about
Less than 300 microns.
In order to further verify the effect of optical diaphragm provided by the present application, remove 10 knot of basement membrane in lighttools
Structure, Comparative result of the lighttools simulation without basement membrane 10 under the same terms, identical light mixing distance is as shown in fig. 6, lamp shadow
Significantly, homogeneity is almost 0.The effect that light mixing distance is got instant result is reduced to demonstrate basement membrane 10.
Optical diaphragm provided in this embodiment is used for down straight aphototropism mode set, can reduce the light mixing of direct-type backlight away from
From and promote light utilization efficiency.By the way that recessed rectangular pyramid or other sunk structures is arranged in the second surface corresponding light source position of basement membrane,
Make the part of light source such as miniLED outgoing light total reflection or be reflected into inside film layer, it is bright to reduce outgoing right above miniLED lamp
Degree；By the way that lattice point structure is arranged in the first surface non-light source region of basement membrane, so that the light inside basement membrane to be scattered and lead
Out, the total reflection light in basement membrane is made full use of, while promoting the brightness in the area human eye vision Xia Wudeng, finally makes straight-down negative
The area backlight You Deng miniLED is identical with the brightness of no lamp area, obtains uniform area source.
A kind of optical diaphragm is present embodiments provided, the light of miniLED vertical direction is all-trans by sunk structure
It penetrates or reflexes to inside film layer, so that light is carried out total reflection transmission in basement membrane, and pass through site of the film layer lower surface without lamp region
Structure is by the light homogenous diffusion propagated in film layer inner total reflection and is emitted, and improves the brightness in no lamp region, forms uniform face
Light source eliminates lamp shadow to reduce the mixed light height of straight-down negative miniLED, and one layer of miniLED lamp plate and the application is only needed to provide
Optical diaphragm can be used as straight-down negative miniLED backlight, realize the ultrathin of straight lower backlight, while avoiding using diffusion barrier,
Light utilization efficiency is improved, existing directly lower miniLED power consumption is reduced.
Another embodiment of the application provides a kind of backlight module, which includes optics described in any embodiment
Diaphragm.
Referring to Fig. 3, light source 11 is mounted on lamp plate 12, and optical diaphragm is placed on the top of lamp plate 12, light source placement region
101 with 11 Matching installation of light source.Wherein, light source 11 can be miniLED, and miniLED is uniform with a fixed spacing on lamp plate 12
Arrangement, MiniLED shine for lambert's body, i.e., have highest light intensity on the direction perpendicular to light-emitting surface.Lamp plate 12 installs light source 11
Side no lamp position even spread white ink, white ink have certain reflectivity can be used as high-reflecting film.
Another embodiment of the application provides a kind of display device, which includes backlight described in any embodiment
Mould group.
It should be noted that display device in the present embodiment can be with are as follows: display panel, Electronic Paper, mobile phone, plate electricity
Any products or components having a display function such as brain, television set, laptop, Digital Frame, navigator.
The embodiment of the present application provides a kind of optical diaphragm, backlight module and display device, by recessed on second surface
It falls into structure incident ray is reflected and transmitted, to reduce the brightness of light source placement region；Reflex to the light in basement membrane
It is transmitted in basement membrane, by the lattice point structure of non-light source placement region on first surface to the light being incident on lattice point structure
Line is scattered, and the region outgoing from second surface in addition to sunk structure, to promote the bright of non-light source placement region
Degree, can form uniform area source in this way, reduce the mixed light height of directly-down light source, eliminate lamp shadow, promote light efficiency, realize straight
The ultrathin of type backlight improves light utilization efficiency, reduces the power consumption of directly-down light source.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, commodity or the equipment that include a series of elements not only include that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, commodity or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in process, method, commodity or the equipment for including the element.
A kind of optical diaphragm provided by the present invention, backlight module and display device are described in detail above, this
Apply that a specific example illustrates the principle and implementation of the invention in text, the explanation of above example is only intended to
It facilitates the understanding of the method and its core concept of the invention；At the same time, for those skilled in the art, think of according to the present invention
Think, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as pair
Limitation of the invention.
Claims (10)
1. a kind of optical diaphragm, which is characterized in that the optical diaphragm includes: basement membrane, and the basement membrane has the first opposite table
Face and second surface, the first surface have light source placement region, on the first surface except the light source placement region it
Outer region is provided with multiple lattice point structures, the lattice point structure for will be incident to the light on the lattice point structure carry out it is scattered
It penetrates；
Sunk structure corresponding with the light source placement region is provided on the second surface, the sunk structure will be for that will enter
The light being incident upon on the sunk structure is reflected and is transmitted.
2. optical diaphragm according to claim 1, which is characterized in that the lattice point structure is pyramid site, recessed net point
Or convex net point.
3. optical diaphragm according to claim 1, which is characterized in that the diameter of the lattice point structure is greater than or equal to 5 μm,
And it is less than or equal to 10 μm.
4. optical diaphragm according to claim 1, which is characterized in that the sunk structure is recessed tetragonous wimble structure, recessed circle
Wimble structure or concave spherical surface structure.
5. optical diaphragm according to claim 1, which is characterized in that the thickness of the basement membrane be greater than or equal to 200 μm, and
Less than or equal to 300 μm.
6. optical diaphragm according to any one of claims 1 to 5, which is characterized in that the surface of the sunk structure is equipped with
First reflecting layer, first reflecting layer have default transmitance.
7. optical diaphragm according to claim 6, which is characterized in that the default transmitance be greater than or equal to 30%, and
Less than or equal to 60%.
8. optical diaphragm according to any one of claims 1 to 5, which is characterized in that the side of the basement membrane is equipped with second
Reflecting layer.
9. a kind of backlight module, which is characterized in that including the described in any item optical diaphragms of claim 1 to 8.
10. a kind of display device, which is characterized in that including backlight module as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910262183.7A CN109976036A (en) | 2019-04-02 | 2019-04-02 | A kind of optical diaphragm, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910262183.7A CN109976036A (en) | 2019-04-02 | 2019-04-02 | A kind of optical diaphragm, backlight module and display device |
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| Publication Number | Publication Date |
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| CN109976036A true CN109976036A (en) | 2019-07-05 |
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| CN201910262183.7A Pending CN109976036A (en) | 2019-04-02 | 2019-04-02 | A kind of optical diaphragm, backlight module and display device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110989244A (en) * | 2019-12-19 | 2020-04-10 | 京东方科技集团股份有限公司 | Transflective film and manufacturing method thereof, MiniLED direct type backlight module and display device |
| CN113325494A (en) * | 2021-01-25 | 2021-08-31 | 深圳市隆利科技股份有限公司 | Reflection-enhanced optical film and direct type backlight module applying same |
| CN114040573A (en) * | 2021-09-28 | 2022-02-11 | 广域兴智能(南通)科技有限公司 | MiniLED PCB surface high-reflection structure using pad printing stacking process mode |
| CN114660852A (en) * | 2022-05-25 | 2022-06-24 | 南京惠华电子技术有限公司 | Novel backlight assembly |
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Effective date of registration: 20211208 Address after: 100015 No. 10, Jiuxianqiao Road, Beijing, Chaoyang District Applicant after: BOE TECHNOLOGY GROUP Co.,Ltd. Applicant after: BOE crystal core technology Co., Ltd Address before: 100015 No. 10, Jiuxianqiao Road, Beijing, Chaoyang District Applicant before: BOE TECHNOLOGY GROUP Co.,Ltd. Applicant before: BOE Optoelectronics Technology |