CN108873126A - 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
- CN108873126A CN108873126A CN201810667886.3A CN201810667886A CN108873126A CN 108873126 A CN108873126 A CN 108873126A CN 201810667886 A CN201810667886 A CN 201810667886A CN 108873126 A CN108873126 A CN 108873126A
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- Prior art keywords
- low
- light
- angle
- piece
- refraction portion
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Abstract
The present invention provides a kind of optical diaphragm, is set to the top of diffusion sheet, including brightening piece, further includes：Brightening piece is set to towards the light management film piece on diffusion sheet side, and light management film on piece is formed with low-refraction portion and refractive index is higher than the high refractive index portion in low-refraction portion；Wherein, low-refraction portion it is adjacent between be provided with corresponding spacing；High refractive index portion be set to low-refraction portion it is adjacent between each spacing in, and the high refractive index portion in each spacing can will be located at the emergent light limited in range and the incident light for maintaining angle to be higher than the predetermined angular directly transmit away from angle of the diffusion sheet on brightening piece direction is angled lower than the reflection of generation incident light of predetermined angular.Implement the present invention, be able to achieve low-angle incident light and spread in exit angle range, to solve the problems, such as that low-angle incident light difficulty brought by existing micro-structure brightening piece is taken out and utilized, reaching improves area source front face brightness, improves the purpose of the efficiency of light energy utilization.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of optical diaphragms, backlight module and display device.
Background technique
Flexible Displays backlight can be usually made in Mini-LED area source, and because having narrow frame in full screen display technology
Anisotropic backlight also can be often made for being shown at present in anisotropic display field so that Mini-LED area source becomes in display advantage
One of major fields of industry research.
Mini-LED area source is mainly made of Mini-LED light source, light guide plate, optical diaphragm, plastic frame etc., because having
Brightness is high, and the service life is long, shines the features such as uniform, so being usually used in providing reliable light source for display panel.In the face Mini-LED light
In source, after the light that Mini-LED light source issues enters light guide plate, the uniform taking-up of light is realized by the site of light guide plate bottom,
Light guide plate upper surface can place a certain number of optical diaphragms, to increase brightness and distribute light over it is more uniform, so as to
It enough covers color spot or increases brightness.In existing design, the optical diaphragm that light guide plate upper surface is placed generally comprises increasing
Mating plate, diffusion sheet etc., but on the existing brightening piece using microstructure design, due to its apex angle is usually arranged as 90 ° very not
Conducive to the taking-up and utilization of low-angle incident light in area source, the area source front efficiency of light energy utilization is greatly reduced.
Therefore, it is necessary to solve that low-angle incident light difficulty brought by existing micro-structure brightening piece is taken out and what is utilized ask
Topic, so that low-angle incident light is diffused into exit angle range and can go out light from existing micro-structure brightening piece, to improve face light
Source front face brightness improves the efficiency of light energy utilization.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of optical diaphragm, backlight module and display dress
It sets, is able to achieve low-angle incident light and is spread in exit angle range, to solve low-angle brought by existing micro-structure brightening piece
The problem of incident light difficulty is taken out and utilized, reaching improves area source front face brightness, improves the purpose of the efficiency of light energy utilization.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of optical diaphragms, are set to the upper of diffusion sheet
Side, including brightening piece further include：The brightening piece is set to towards the light management film piece on the diffusion sheet side, and the control
It is formed with low-refraction portion on light diaphragm and refractive index is higher than the high refractive index portion in the low-refraction portion；Wherein,
Corresponding spacing is reserved between the low-refraction portion is adjacent；
The high refractive index portion be set to the low-refraction portion it is adjacent between each spacing in, and the high folding in each spacing
It penetrates and commands troops will be lower than the reflection of generation incident light angulation of predetermined angular from angle of the diffusion sheet on the brightening piece direction
Degree is located at the emergent light limited in range and the incident light for maintaining angle to be higher than the predetermined angular directly transmits away.
Wherein, the low-refraction portion it is adjacent between reserve spacing should all be located at by formulaIt calculates resulting
In distance range；Wherein, d is the spacing reserved between the low-refraction portion is adjacent；θ is positioned at the restriction range
An angle in [20 °, 40 °]；λ is wavelengths of white light, and value range is 380nm ~ 780nm；N is number of wavelengths, n=1 or 2.
Wherein, the resulting distance range of calculating is 600 μm -2300 μm.
Wherein, the low-refraction portion it is adjacent between reserve spacing differ, and the low-refraction portion it is adjacent between
Structure is different.
Wherein, the structure in the low-refraction portion is spindle, elliposoidal, spherical shape, taper or cuboid；The low folding
It penetrates and commands troops along the angle position that the thickness direction of the light management film piece is arranged and formed between the thickness direction of the light management film piece
In [5 °, 10 °], and the end face at its both ends is respectively with the light management film piece towards the side of the brightening piece side and far from described
The side flush of brightening piece side.
Wherein, the content accounting in the low-refraction portion is 20%-30%, and the content accounting in the high refractive index portion is 70%-
80%。
Wherein, the material that the low-refraction portion uses includes polymetylmethacrylate, polyethylene and polychlorostyrene second
Alkene；The material that the high refractive index portion uses includes polycarbonate and polyethylene terephtalate.
Wherein, the light management film piece is equipped with upper protective film layer also on the side towards the brightening piece side, and also exists
Side far from the brightening piece side is equipped with lower protective film layer.
The embodiment of the invention also provides a kind of backlight modules, including optical diaphragm above-mentioned.
The embodiment of the present invention provides a kind of display device, including backlight module above-mentioned again.
The embodiment of the present invention has the advantages that：Light management film piece is integrated on brightening piece by the present invention, passes through setting
Spacing between the low-refraction portion of light management film on piece, so that energy will be from diffusion in the high refractive index portion being filled in each spacing
Angle of the piece on brightening piece direction be angled lower than the reflection of generation incident light of predetermined angular be located at limit emergent light in range with
And the incident light for maintaining angle to be higher than predetermined angular directly transmits away, to realize that low-angle incident light expands in exit angle range
It dissipates, solves the problems, such as that low-angle incident light difficulty brought by existing micro-structure brightening piece is taken out and utilized, reach improvement face light
Source front face brightness improves the purpose of the efficiency of light energy utilization.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without any creative labor, according to
These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 is a partial profile structure of the optical diaphragm provided in the embodiment of the present invention one；
Fig. 2 is that light management film piece realizes that low-angle incident light is spread after reflection in the optical diaphragm provided in the embodiment of the present invention one
At the application scenario diagram of wide-angle emergent light；
Fig. 3 is that light management film piece realizes that large angle incidence light directly transmitted answers in the optical diaphragm that provides in the embodiment of the present invention one
With scene figure；
Fig. 4 is another partial profile structure of the optical diaphragm provided in the embodiment of the present invention one；
Fig. 5 is a partial profile structure of the backlight module provided in the embodiment of the present invention two.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
As shown in Figures 1 to 5, in the embodiment of the present invention one, a kind of optical diaphragm that inventor provides is set to diffusion
Piece（It is not shown）Top, including brightening piece 1 further includes：Brightening piece 1 is set to towards the light management film piece 2 on diffusion sheet side,
And the high refractive index portion 22 of low-refraction portion 21 and refractive index higher than low-refraction portion 21 is formed on the light management film piece 2；Its
In, the material that low-refraction portion 21 uses includes polymetylmethacrylate, polyethylene and polyvinyl chloride；High refractive index portion
22 materials used include polycarbonate and polyethylene terephtalate；
Corresponding spacing is reserved between low-refraction portion 21 is adjacent；
High refractive index portion 22 be set to low-refraction portion 21 it is adjacent between each spacing in, and the high refractive index in each spacing
Portion 22 can will be located at restriction from angle of the diffusion sheet on 1 direction of brightening piece is angled lower than the reflection of generation incident light of predetermined angular
The incident light that emergent light and maintenance angle in range are higher than the predetermined angular directly transmits away.
It should be noted that the angle of incident light and emergent light refers to the angle between light and normal.It is with brightening piece 1
The angle of reference substance, incident light and emergent light just refers to light and perpendicular to the angle between the normal in 1 direction of brightening piece.
In the embodiment of the present invention one, since the efficiency of light energy utilization of the light within the scope of ± 20 ° of polar angles is lower, the angle model
Enclosing interior light will appear multiple reflections so that energy loss is more, therefore to low-refraction portion 21 it is adjacent between spacing carry out
Setting, so that passing upward through the incident light of the low-angle in the high refractive index portion 22 in each spacing from diffusion sheet to brightening piece side
（Such as angle<20 ° of predetermined angular）It can reflect the angled outgoing for being located at and limiting the wide-angle in range [20 °, 40 °]
Light, while angle can also be maintained to be higher than predetermined angular（Such as angle>20 ° of=predetermined angular）Incident light directly transmit away.
In one embodiment, as indicated with 2, incident light is the light perpendicular to 1 direction of brightening piece, the i.e. angle of incident light
Be 0 °, incident light after two high refractive index portions 22 total reflection spaced between intermediate three low-refraction portions 21, and
The emergent light of the angled wide-angle between [20 °, 40 °] of diffusion, i.e., when incident light is with low-angle incidence, portion of incident light
By that can be totally reflected when high refractive index portion 22, finally with the outgoing of wide-angle direction, realize that low-angle light arrives wide-angle
Diffusion.
In another embodiment, as indicated at 3, incident light is to have greatly between the normal perpendicular to 1 direction of brightening piece
The light of angle, the i.e. angle of incident light are higher than 20 °, are directly directly transmitted by low-refraction portion 21 and high refractive index portion 22
It goes, i.e., when incident light is with the incidence of wide-angle direction, incident light is not up to all-trans in low-refraction portion 21 and high refractive index portion 22
Firing angle ensure that wide-angle light diffusion is smaller so that light direction is substantially parallel with incident direction.
In the embodiment of the present invention one, the spacing reserved between low-refraction portion 21 is adjacent can by limit range [20 °,
40 °], the number of wavelengths of wavelengths of white light and fixation determines.For example, the spacing reserved between low-refraction portion 21 is adjacent can pass through
FormulaIt is calculated, so that the spacing d reserved between low-refraction portion 21 is adjacent should all be located at above-mentioned formula and calculate
In 600 μm -2300 μm of resulting distance range, realize the angle of emergent light between [20 °, 40 °]；Wherein, d is low refraction
Command troops 21 it is adjacent between reserve spacing；θ is positioned at the angle limited in range [20 °, 40 °]；λ is wavelengths of white light, value
Range is 380nm ~ 780nm；N is number of wavelengths, n=1 or 2.
In the embodiment of the present invention one, the appearance of moire fringes in order to prevent, can by low-refraction portion 21 it is adjacent between it is pre-
The spacing stayed is set as, and by low-refraction portion 21 it is adjacent between structure setting be it is different；Wherein, low-refraction portion 21
Structure include but is not limited to spindle, elliposoidal, spherical shape, taper, cuboid etc..
In the embodiment of the present invention one, the thickness of light management film piece 2, the content in low-refraction portion 21 are controlled by manufacture craft
Than and its orientation texture orientation, can preferably control 2 different angle of light management film piece and go out the diffusion ratio of light, to be closed
Suitable diaphragm parameters.In one embodiment, by low-refraction portion 21 along the thickness direction of light management film piece 2（That is light discrepancy side
To）It arranges and the angle that is formed between the thickness direction of light management film piece 2 is located at [5 °, 10 °], and by 21 both ends of low-refraction portion
End face respectively with light management film piece 2 towards the side of 1 side of brightening piece and far from 1 side of brightening piece side flush；Setting
The content accounting in low-refraction portion 21 is 20%-30%, and the content accounting in high refractive index portion 22 is 70%-80%, while control light is arranged
Diaphragm 2 with a thickness of 50 μm -100 μm.
In the embodiment of the present invention one, in order to protect light management film piece, therefore also in light management film piece 2 towards 1 side of brightening piece
Side be equipped with upper protective film layer 23, and also far from 1 side of brightening piece side on be equipped with lower protective film layer 24（Such as Fig. 4
It is shown）.Certainly, the overall thickness of light management film piece controls between 100 μm -200 μm at this time.
Corresponding to the optical diaphragm of the embodiment of the present invention one, in the embodiment of the present invention two, inventor additionally provides one kind
Backlight module, including the optical diaphragm in the embodiment of the present invention one.Due to the optical diaphragm and this hair in the embodiment of the present invention two
Optical diaphragm structure having the same and connection relationship in bright embodiment one, specifically refer to the phase in the embodiment of the present invention one
Hold inside the Pass, this is no longer going to repeat them.
In one embodiment, as shown in figure 5, backlight module includes substrate 100, LED chip 200, fluorescent film 300, expands
Discrete piece 400 and the optical diaphragm 500 for being integrated with light management film piece 2 and brightening piece 1；Wherein,
LED chip 200 is fixed on the substrate 100 by tin cream on pad；
Fluorescent film 300 is that fluorescent powder, silica gel and mist degree particle mix, and are adhered to its smooth by press mold curing process
On substrate 100 and cover LED chip 200；
Diffusion sheet 400 is set to 300 top of fluorescent film, mainly spreads the light on area source surface uniform；
Optical diaphragm 500 is set to the top of diffusion sheet 400, and light management film piece 2 thereon fits together with diffusion sheet 400, and
The light that goes out in a certain small angle range is diffused into biggish angular range by light management film piece 2, and further cooperation adds lustre to
The receipts angular of piece 1 promotes the positive smooth extraction efficiency of area source and brightness.
Similarly, corresponding to the backlight module in the embodiment of the present invention two, in the embodiment of the present invention three, inventor is also provided
A kind of display device, including the backlight module in the embodiment of the present invention two.Due to the backlight module in the embodiment of the present invention three
Backlight module structure having the same and connection relationship with the embodiment of the present invention two, specifically refer to the embodiment of the present invention two
In related content, this is no longer going to repeat them.
The embodiment of the present invention has the advantages that：Light management film piece is integrated on brightening piece by the present invention, passes through setting
Spacing between the low-refraction portion of light management film on piece, so that energy will be from diffusion in the high refractive index portion being filled in each spacing
Angle of the piece on brightening piece direction be angled lower than the reflection of generation incident light of predetermined angular be located at limit emergent light in range with
And the incident light for maintaining angle to be higher than predetermined angular directly transmits away, to realize that low-angle incident light expands in exit angle range
It dissipates, solves the problems, such as that low-angle incident light difficulty brought by existing micro-structure brightening piece is taken out and utilized, reach improvement face light
Source front face brightness improves the purpose of the efficiency of light energy utilization.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (10)
1. a kind of optical diaphragm is set to the top of diffusion sheet, including brightening piece, which is characterized in that further include：It is set to described
Brightening piece is towards the light management film piece on the diffusion sheet side, and the light management film on piece is formed with low-refraction portion and refraction
Rate is higher than the high refractive index portion in the low-refraction portion；Wherein,
Corresponding spacing is reserved between the low-refraction portion is adjacent；
The high refractive index portion be set to the low-refraction portion it is adjacent between each spacing in, and the high folding in each spacing
It penetrates and commands troops will be lower than the reflection of generation incident light angulation of predetermined angular from angle of the diffusion sheet on the brightening piece direction
Degree is located at the emergent light limited in range and the incident light for maintaining angle to be higher than the predetermined angular directly transmits away.
2. optical diaphragm as described in claim 1, which is characterized in that the spacing reserved between the low-refraction portion is adjacent is equal
It should be located at by formulaIt calculates in resulting distance range；Wherein, d is to reserve between the low-refraction portion is adjacent
One spacing；θ is the angle in the restriction range [20 °, 40 °]；λ is wavelengths of white light, value range be 380nm ~
780nm；N is number of wavelengths, n=1 or 2.
3. optical diaphragm as claimed in claim 2, which is characterized in that the resulting distance range of calculating is 600 μm -2300
μm。
4. optical diaphragm as claimed in claim 3, which is characterized in that the spacing reserved between the low-refraction portion is adjacent is not
Deng, and the low-refraction portion it is adjacent between structure it is different.
5. optical diaphragm as claimed in claim 4, which is characterized in that the structure in the low-refraction portion is spindle, ellipsoid
Shape, spherical shape, taper or cuboid；The low-refraction portion along the light management film piece thickness direction arrangement and with the control light
The angle formed between the thickness direction of diaphragm is located at [5 °, 10 °], and the end face at its both ends respectively with the light management film piece direction
The side flush of the side of the brightening piece side and the separate brightening piece side.
6. optical diaphragm as claimed in claim 5, which is characterized in that the content accounting in the low-refraction portion is 20%-30%,
The content accounting in the high refractive index portion is 70%-80%.
7. optical diaphragm as claimed in claim 6, which is characterized in that the material that the low-refraction portion uses includes poly- methyl
Methyl acrylate PMMA, polyethylene and polyvinyl chloride；The material that the high refractive index portion uses includes polycarbonate and poly- pair
Ethylene terephthalate PET.
8. optical diaphragm as claimed in claim 7, which is characterized in that the light management film piece is also towards the brightening piece side
Side be equipped with upper protective film layer, and also far from the brightening piece side side on be equipped with lower protective film layer.
9. a kind of backlight module, which is characterized in that including optical diaphragm such as of any of claims 1-8.
10. a kind of display device, which is characterized in that including backlight module as described in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810667886.3A CN108873126B (en) | 2018-06-26 | 2018-06-26 | Optical film, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810667886.3A CN108873126B (en) | 2018-06-26 | 2018-06-26 | Optical film, backlight module and display device |
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| Publication Number | Publication Date |
|---|---|
| CN108873126A true CN108873126A (en) | 2018-11-23 |
| CN108873126B CN108873126B (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810667886.3A Active CN108873126B (en) | 2018-06-26 | 2018-06-26 | Optical film, backlight module and display device |
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| CN (1) | CN108873126B (en) |
Cited By (1)
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|---|---|---|---|---|
| CN116819825A (en) * | 2023-04-18 | 2023-09-29 | 惠科股份有限公司 | Light control, backlight module and display device |
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| Publication number | Publication date |
|---|---|
| CN108873126B (en) | 2021-04-30 |
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