CN110262128A - Backlight angle control method based on index matching - Google Patents
Backlight angle control method based on index matching Download PDFInfo
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- CN110262128A CN110262128A CN201910519715.0A CN201910519715A CN110262128A CN 110262128 A CN110262128 A CN 110262128A CN 201910519715 A CN201910519715 A CN 201910519715A CN 110262128 A CN110262128 A CN 110262128A
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- micro
- dielectric layer
- method described
- angle
- light
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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
-
- 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
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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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
A kind of backlight angle control method based on index matching, it is characterized in that designing a micro-structure in optics film surface, make the refractive index and optics film base material index matching of micro-structure, one layer of dielectric layer for meeting required refractive index is filled in light micro-structure gap out simultaneously, adjust the shape of dielectric layer, pass through the adjustment of parameter in said combination, it enters back into the light being emitted by this optical film in air dielectric after the dielectric layer, is emitted to control backlight angle according to the angle that multidigit observer needs.The method of the present invention is simple, it is easy to accomplish, multi-angle observation significant effect.
Description
Technical field
The present invention relates to a kind of LCD technology, especially a kind of backlight angle control technology is specifically a kind of
Backlight angle control method based on index matching.
Background technique
Backlight module is the optical module of an offer back side light source in LCD display product.Traditional backlight module its
Master is by wanting the components such as light source, light guide plate, diffusion barrier, prismatic brightness film, reflecting plate to assemble, as shown in Figure 1.Optical film group
In, the usually combination of diffusion barrier, prismatic brightness film.
It is poor that light self-diffusion film projects rear tropism, it is therefore necessary to the direction of light is corrected using prismatic brightness film.Prism
Brightness enhancement film is that accurate acryl-based resin prism structure is formed in surface of polyester, and principle is to be reached by the refraction of light with reflection
Convergence light allows the light projected greater than 70 ° to gather to normal direction, is increased by increasing exitance of the light within the scope of 70 °
Service efficiency after adding light self-diffusion film to project makes the brightness of whole backlight module improve 100% even higher.Usual one
A backlight module will use two panels prismatic lens, and direction is vertical each other, and light is focused in the angular range near normal, to increase
Add the front face brightness of display.
Light is emitted from optical film group, and brightness reduces gradually within the scope of centre visual angle maximum, certain angle, and is applied to
The liquid crystal display of the special occasions such as game, vehicle-mounted, proposes particular/special requirement to viewing visual angle, and there are multiple observers in difference
Position observation, traditional monitor observing effect is limited, and backlight visual angle is not designed for observer, and observing effect is poor, and
Reduce utilization ratio of optical energy.It is therefore desirable to the backlight film groups to the prior art to improve.
Summary of the invention
The purpose of the present invention is being observed for existing back light module unit structure only for central vision, multi-angle of view observation view
Feel effect it is poor, the low problem of utilization ratio of optical energy, invent it is a kind of can be based on the backlight angle control method of index matching.
The technical scheme is that
A kind of backlight angle control method based on index matching makes it is characterized in that designing a micro-structure in optics film surface
The refractive index and optics film base material index matching of micro-structure, while filling one layer in light micro-structure gap out and meeting required folding
The dielectric layer for penetrating rate adjusts the shape of dielectric layer, by the adjustment of parameter in said combination, makes the light being emitted by this optical film
Line enters back into air dielectric after the dielectric layer, to control the angle that backlight angle is needed according to multidigit observer
Outgoing.
The optical film surface micro-structure shape is asymmetric or symmetrical.
The optical film surface micro-structure shape is special surface, rectangle, trapezoidal or other shapes.
The thickness of the dielectric layer is not less than the vertical height of micro-structure.
Between 1.62 to 1.75, micro-structure ranges of indices of refraction exists the control angle optical film substrate ranges of indices of refraction
Between 1.55 to 1.61, the refractive index of dielectric layer is between 1.2-1.4.
The size of the micro-structure: 20 μm to 150 μm.
The micro-structure is equal pitch or non-equidistant structure.
The light transmittance of the dielectric layer is greater than 98%.
The dielectric layer surface shape can be curved surface or other shapes.
Backlight mode can be side back light or direct-type backlight.
Beneficial effects of the present invention:
The present invention effectively controls light-emitting angle, meets the effect that multiple observers use, reduces the brightness distortion of backlight module
Situation improves utilization ratio of optical energy.
The method of the present invention is simple, it is easy to accomplish, multi-angle observation significant effect.
Detailed description of the invention
Fig. 1 is existing back light module unit structure schematic diagram.
Fig. 2 is that the present invention is based on one kind of index matching to be directed to observer's microstructure backlight structural schematic diagram at three.
Fig. 3 is observer's backing structure schematic diagram at the another kind three of the invention based on index matching.
Fig. 4 is to improve front and back display emitting brightness angular distribution.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 2,3, 4.
A kind of backlight angle control method based on index matching, it by optics film surface design a micro-structure,
Make the refractive index and optics film base material index matching of micro-structure, while being filled needed for one layer of satisfaction in light micro-structure gap out
The dielectric layer of refractive index adjusts the shape of dielectric layer, by the adjustment of parameter in said combination, makes by the outgoing of this optical film
Light enters back into air dielectric after the dielectric layer, to control the angle that backlight angle is needed according to multidigit observer
Degree outgoing.Essence of the invention is to change the conventional design and application method of optical film in backlight module, designs the micro- knot of optical film
Structure carries out angle adjustment, and matches optics film base material, micro-structure refractive index according to shooting angle, while a kind of folding is added
The matched medium of rate is penetrated, matches the refractive index between optical film and air dielectric more.Pass through the micro-structure of optical film, dielectric layer
Surface shape design, while the parameters such as substrate, micro-structure, the refractive index of dielectric layer, thickness, transmitance are adjusted, it can control out
Angular meets the three observation demands for sentencing lower position.The present invention by change Fig. 1 prismatic brightness film 6 microstructure aspects 8 or
Person 10, micro-structure surface filled media layer surface shape 11, while the refractive index of optics film base material, micro-structure, dielectric layer is adjusted,
It enters back into the light being emitted by this optical film after the dielectric layer 11 in air dielectric and goes out light to control backlight
Angle, meet multi-angle of view observation purpose, improve utilization ratio of optical energy.
Fig. 2 is a kind of backlight module of flat-panel monitor, using side back light mode, the principle phase of direct-type backlight mode
Together, light source is LED 1, and 3 bottom surface of light guide plate is reflecting plate or reflectance coating 2, and the light that LED is issued enters light guide plate 3, by leaded light
The effect of plate 3 and reflectance coating 2 is optical film group on 3 upper surface uniform of light guide plate, light guide plate 3, generally selection diffusion barrier
With the combination of prismatic brightness film.Light is after diffusion barrier homogenization, and angular distribution is larger, into microstructured optical film.It is micro-
Feature optical film is divided into 3 layers, and coarse bottom 4, substrate 7 and micro-structure 8, optical film surface micro-structure use trapezoidal 8, controls light
It is emitted three directions, between 7 refractive index 1.62 to 1.75 of substrate, 8 refractive index 1.55 to 1.62 of micro-structure, the ruler of trapezoid micro-structure
Very little is 20 μm to 150 μm, and trapezoidal angle is between 70 ° to 120 °.Trapezoid micro-structure can be equal pitch, be also possible to non-etc.
Away from.The design parameter of micro-structure in Fig. 2 are as follows: micro-structure be it is trapezoidal, 50 μm of pitch, equidistantly, the angle of shape at 110 °, refraction
Rate 1.6.When beam projecting micro-structure surface, the light of wide-angle is totally reflected, and larger part energy concentrates on ± 30 ° of models
In enclosing, minimized at ± 40 ° or so, 60 ° or so total reflection it is critical near, light ray energy is uprushed, such as 14 institutes in Fig. 4
Show.The backlight film group application method of comparison diagram 1 changes microstructure aspects and dielectric layer shape, and after use index matching,
Shooting angle and total reflection condition change, and the former spuious brightness of wide-angle increases, and angular field of view is widened, reached such as 14 in Fig. 4
It is shown.The backlight film group application method of comparison diagram 1 can be used for multi-angle of view observation, such as shown in 13 in Fig. 4 after improving
In Fig. 4 14 shown in.
In Fig. 4 curved surface microstructure backlight, full medium is filled between 10 refractive index 1.62 to 1.75 of substrate, between micro-structure 11
Layer 12, transparent material of the dielectric layer 12 generally using light transmittance greater than 98% manufacture, and the rib ranges of indices of refraction of curved surface microstructure 11 exists
When between 1.55 to 1.65, for the refractive index of dielectric layer 12 between 1.2-1.4, dielectric surface can may be song for plane
Face.The size of micro-structure is that 20 μm to 150 μm curved surface microstructures can be equal pitch, is also possible to non-isometric.Rib in Fig. 3
Design parameter are as follows: microstructure aspects are quadratic surfaces, 50 μm of pitch, equidistantly, refractive index 1.59.Beam projecting micro-structure surface
When, the light of wide-angle is totally reflected, and most of energy concentrates within the scope of ± 30 °, is minimized at ± 40 ° or so, 60 °
Left and right total reflection it is critical near, light ray energy is uprushed, as shown in 15 in Fig. 4.The backlight film group user of comparison diagram 1
Method changes microstructure aspects and dielectric layer shape, and after use index matching processing, shooting angle and total reflection condition change
Become, the former spuious brightness of wide-angle increases, and angular field of view is widened, reached as shown in 15 in Fig. 4, can be used for multi-angle of view sight
It examines.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.
Claims (10)
1. a kind of backlight angle control method based on index matching, it is characterized in that a micro-structure is designed in optics film surface,
Make the refractive index and optics film base material index matching of micro-structure, while being filled needed for one layer of satisfaction in light micro-structure gap out
The dielectric layer of refractive index adjusts the shape of dielectric layer, by the adjustment of parameter in said combination, makes by the outgoing of this optical film
Light enters back into air dielectric after the dielectric layer, to control the angle that backlight angle is needed according to multidigit observer
Degree outgoing.
2. according to the method described in claim 1, it is characterized in that optical film surface micro-structure shape is asymmetric or symmetrical.
3. according to the method described in claim 1, it is characterized in that optical film surface micro-structure shape is special surface, rectangle, ladder
Shape or other shapes.
4. according to the method described in claim 1, it is characterized in that the thickness of the dielectric layer is not less than the vertical height of micro-structure
Degree.
5. according to the method described in claim 1, it is characterized in that the control angle optical film substrate ranges of indices of refraction exists
Between 1.62 to 1.75, micro-structure ranges of indices of refraction between 1.55 to 1.62, the refractive index of dielectric layer between 1.2-1.4 it
Between.
6. according to the method described in claim 1, it is characterized in that the size of the micro-structure: 20 μm to 150 μm.
7. according to the method described in claim 1, it is characterized in that the micro-structure is equal pitch or non-equidistant structure.
8. according to the method described in claim 1, it is characterized in that the light transmittance of the dielectric layer is greater than 98%.
9. according to the method described in claim 1, it is characterized in that the dielectric layer surface shape can for curved surface or other
Shape.
10. according to the method described in claim 1, it is characterized in that backlight mode is side back light or direct-type backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910519715.0A CN110262128A (en) | 2019-06-17 | 2019-06-17 | Backlight angle control method based on index matching |
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|---|---|---|---|
| CN201910519715.0A CN110262128A (en) | 2019-06-17 | 2019-06-17 | Backlight angle control method based on index matching |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063772A (en) * | 2006-04-27 | 2007-10-31 | 瀚宇彩晶股份有限公司 | Back light module for liquid crystal display |
| CN101213401A (en) * | 2005-06-29 | 2008-07-02 | 可乐丽股份有限公司 | Lighting system, light control member used therefor, and image display device using the same |
| JP2008153634A (en) * | 2006-11-24 | 2008-07-03 | Sony Corp | Method for manufacturing light-emitting diode, light-emitting diode, lightsource cell unit, light-emitting diode backlight, light-emitting diode illuminating device, light-emitting diode display, and electronic apparatus |
| CN101363924A (en) * | 2007-08-10 | 2009-02-11 | 精碟科技股份有限公司 | Optical membrane |
| CN103744229A (en) * | 2013-12-12 | 2014-04-23 | 中国电子科技集团公司第五十五研究所 | Backlight angle control method based on refraction index matching |
| CN104335080A (en) * | 2012-06-08 | 2015-02-04 | 迪睿合电子材料有限公司 | Optical element, fabrication method thereof, display element, and projecting image display device |
| CN107831562A (en) * | 2017-02-23 | 2018-03-23 | 常州华威新材料有限公司 | A kind of high resistance to scraping bright enhancement film and preparation method thereof |
-
2019
- 2019-06-17 CN CN201910519715.0A patent/CN110262128A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101213401A (en) * | 2005-06-29 | 2008-07-02 | 可乐丽股份有限公司 | Lighting system, light control member used therefor, and image display device using the same |
| CN101063772A (en) * | 2006-04-27 | 2007-10-31 | 瀚宇彩晶股份有限公司 | Back light module for liquid crystal display |
| JP2008153634A (en) * | 2006-11-24 | 2008-07-03 | Sony Corp | Method for manufacturing light-emitting diode, light-emitting diode, lightsource cell unit, light-emitting diode backlight, light-emitting diode illuminating device, light-emitting diode display, and electronic apparatus |
| CN101363924A (en) * | 2007-08-10 | 2009-02-11 | 精碟科技股份有限公司 | Optical membrane |
| CN104335080A (en) * | 2012-06-08 | 2015-02-04 | 迪睿合电子材料有限公司 | Optical element, fabrication method thereof, display element, and projecting image display device |
| CN103744229A (en) * | 2013-12-12 | 2014-04-23 | 中国电子科技集团公司第五十五研究所 | Backlight angle control method based on refraction index matching |
| CN107831562A (en) * | 2017-02-23 | 2018-03-23 | 常州华威新材料有限公司 | A kind of high resistance to scraping bright enhancement film and preparation method thereof |
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Application publication date: 20190920 |