CN104422984B - A kind of light extraction design method - Google Patents
A kind of light extraction design method Download PDFInfo
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- CN104422984B CN104422984B CN201310366547.9A CN201310366547A CN104422984B CN 104422984 B CN104422984 B CN 104422984B CN 201310366547 A CN201310366547 A CN 201310366547A CN 104422984 B CN104422984 B CN 104422984B
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- guide plate
- light guide
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- scattering
- light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention relates to optical technical field, specifically, is related to a kind of light extraction design method of light guide plate.The present invention comprises the following steps：The 1st, the parameter and light source set location of light guide plate are provided；2nd, coordinate system is established, sets the mesh generation of light guide plate, and function representation is carried out to scattering netted dot；3rd, by the uniformity of luminous flux, Integration Solving is carried out to the infinitesimal in light guide plate；4th, brightness of the scattering brightness of site to sending light is directly proportional, lists the proportion expression of two luminous fluxes；5th, network point distribution function is calculated.After the present invention fixes for the form parameter of light source and light guide plate, it is distributed by designing light guide plate mesh point, can make it that the light that backlight module is sent is uniform, without dark space.
Description
Technical field
The present invention relates to optical technical field, specifically, is related to a kind of light extraction design method of light guide plate.
Background technology
Due to LED low in energy consumption, good energy-conserving effect；It is widely used in every field；Such as it is applied to as backlight aobvious
Display screen, and at present because many display screens need to be made thin, therefore the backlight module of display screen typically uses side light-guiding type
Structure；But the lateral thickness of the light guide plate of side light-guiding type is smaller, from the side of light guide plate enter light after projecting, reflecting from
Exiting surface is sent；The back light module unit structure designed at present, do not account for distribution of the light inside light guide plate, so as to cause from
The light that light guide plate is sent has a dark space, and the uniformity is poor.Therefore in order to improve the backlight module illumination effect of side-light type, certainly will set
Meter one is relatively reasonable to go out light path.
The content of the invention
For the present invention to solve in the prior art, the light extraction design of the backlight module of side light-guiding type is unreasonable, causes light extraction not
Uniformly, there is the problem of dark space, there is provided a kind of light extraction design method, this method can be optimized to the light in light guide plate, reached
To the effect of uniform in light emission.
In when going out optical link of light guide plate of regulation, site most commonly is set in the bottom surface of light guide plate at present, that is, dimmed
Site；The distribution of light modulation site can directly influence the outgoing light homogeneity of light guide plate, in order to improve its uniformity, the technical program
Distribution directly against its site is designed.The technical solution adopted in the present invention is：
A kind of light extraction design method, comprises the following steps：
Step 1：A light guide plate is provided, the refractive index of light guide plate is θ, critical angle Φ, thickness D；Light source is placed, is made
Obtain light source and send light when entering light guide plate, its incidence angle is less than critical angle；
Step 2：Coordinate is established, straight line where light source is y-axis, and the length direction of light guide plate is x-axis, and x-axis is positioned at leaded light
The middle part of plate；
Step 3：The bottom surface of light guide plate sets scattering netted dot, and carries out mesh generation to light guide plate；Scattering netted dot is distributed
Function is：F (x, y)=s (x, y)/d2；In formula：S (x, y) represents the area of one scattering point in (x, y) place；D is side length of element；
Step 4：The light flux variations of infinitesimal dxdy in light guide plate are：D φ (x, y)=Bdxdy；Wherein, B is light guide plate
The brightness of output and be constant value；
Step 5：The infinitesimal of step 4 is integrated, obtains the luminous flux at (x, y) place：φ (x, y)=T1+T2+……+
Tn；Wherein：Ti=φi-BW1(x2+(yi-y)2)1/2；Wherein light source coordinates are followed successively by：(0、y1) ... ..., (0, yn)；WiIt is expressed as
The arc length that the spherical wave of i-th of light source is intercepted by light guide plate at (x, y) place；φiRepresent at i-th of light source (0, yi) coupling
Close the luminous flux into light guide plate；
Step 6：The emergent light brightness of the exiting surface of light guide plate is proportional to bottom area scattering brightness, has：B=kB1；Wherein
B1The scattering brightness sent for the scattering of bottom surface scattering netted dot；And B1=k1φ(x、y)f(x、y)；k、k1It is proportionality constant；
Step 7：F (x, y) is calculated, obtains f (x, y)=B/ (kk1φ(x、y))。
Further, design is optimized to the shape of the site of light guide plate, site is hemispherical or spherical.
Need to be scattered light in view of site, select hemispherical or domed site proper.
Further, k, k in step 61Choose according to the design needs.
Further, k 5, k1For 0.3.
Beneficial effects of the present invention：After the present invention fixes for the form parameter of light source and light guide plate, led by design
Tabula rasa network point distribution, it can make it that the light that backlight module is sent is uniform.
Brief description of the drawings
Fig. 1 is LED side leaded light schematic diagram.
W in figureiBe expressed as i-th light source (0, yi) the arc length that is intercepted by light guide plate at (x, y) place of spherical wave；Wj
Be expressed as j-th light source (0, yj) the arc length that is intercepted by light guide plate at (x, y) place of spherical wave.
Embodiment
The present invention is described in further detail with reference to Fig. 1 and embodiment.
Embodiment：A kind of light extraction design method, comprises the following steps：
Step 1：A light guide plate is provided, the refractive index of light guide plate is θ, critical angle Φ, thickness D；Light source is placed, is made
Obtain light source and send light when entering light guide plate, its incidence angle is less than critical angle；
Step 2：Coordinate is established, straight line where light source is y-axis, and the length direction of light guide plate is x-axis, and x-axis is positioned at leaded light
The middle part of plate；
Step 3：The bottom surface of light guide plate sets scattering netted dot, and carries out mesh generation to light guide plate；Scattering netted dot is distributed
Function is：F (x, y)=s (x, y)/d2；In formula：S (x, y) represents the area of one scattering point in (x, y) place；D is side length of element；
Step 4：The light flux variations of infinitesimal dxdy in light guide plate are：D φ (x, y)=Bdxdy；Wherein, B is light guide plate
The brightness of output and be constant value；
Step 5：The infinitesimal of step 4 is integrated, obtains the luminous flux at (x, y) place：φ (x, y)=T1+T2+……+
Tn；Wherein：Ti=φi-BW1(x2+(yi-y)2)1/2；Wherein light source coordinates are followed successively by：(0、y1) ... ..., (0, yn)；WiIt is expressed as
The arc length that the spherical wave of i-th of light source is intercepted by light guide plate at (x, y) place；φiRepresent at i-th of light source (0, yi) coupling
Close the luminous flux into light guide plate；
Step 6：Light in light guide plate is just scattered only after site is run into, therefore the outgoing of the exiting surface of light guide plate
Brightness is proportional to bottom area scattering brightness, has：B=kB1；Wherein B1The scattering light sent for the scattering of bottom surface scattering netted dot
Brightness；And B1=k1φ(x、y)f(x、y)；k、k1It is proportionality constant；
Step 7：F (x, y) is calculated, obtains f (x, y)=B/ (kk1φ(x、y))。
Further, it is 5, k by k1For 0.3.
As a result show, the light guide plate designed by above-mentioned light extraction when in use, uniform in light emission；Dark space does not have substantially.
It the above is only the preferred embodiment of the application, equivalent technical solutions on this basis still fall within application protection model
Enclose.
Claims (3)
- A kind of 1. light extraction design method, it is characterised in that：Comprise the following steps：Step 1：A light guide plate is provided, the refractive index of light guide plate is θ, critical angle Φ, thickness D；Place light source so that light Source sends light when entering light guide plate, and its incidence angle is less than critical angle；Step 2：Coordinate is established, straight line where light source is y-axis, and the length direction of light guide plate is x-axis, and x-axis is located at light guide plate Middle part；Step 3：The bottom surface of light guide plate sets scattering netted dot, and carries out mesh generation to light guide plate；Scattering netted dot distribution function For：F (x, y)=s (x, y)/d2；In formula：S (x, y) represents the area of one scattering point in (x, y) place；D is side length of element；Scattering Site is evenly distributed on light guide plate, spacing of the side length of element between two adjacent scattering netted dots；Step 4：The light flux variations of infinitesimal dxdy in light guide plate are：D φ (x, y)=Bdxdy；Wherein, B exports for light guide plate Brightness and be constant value；Step 5：The infinitesimal of step 4 is integrated, obtains the luminous flux at (x, y) place：φ (x, y)=T1+T2+……+Tn；Its In：Ti=φi-BWi(x2+(yi-y)2)1/2；Wherein light source coordinates are followed successively by：(0、y1) ... ..., (0, yn)；WiIt is expressed as i-th The arc length that the spherical wave of light source is intercepted by light guide plate at (x, y) place；φiRepresent at i-th of light source (0, yi) be coupled into The luminous flux of light guide plate；Step 6：The emergent light brightness of the exiting surface of light guide plate is proportional to bottom area scattering brightness, has：B=kB1；Wherein B1For The scattering brightness that the scattering of bottom surface scattering netted dot is sent；And B1=k1φ(x、y)f(x、y)；k、k1It is proportionality constant；Step 7：F (x, y) is calculated, obtains f (x, y)=B/ (kk1φ(x、y))。
- A kind of 2. light extraction design method according to claim 1, it is characterised in that：The shape of the site of light guide plate is carried out Optimization design, site are hemispherical or spherical.
- A kind of 3. light extraction design method according to claim 1, it is characterised in that：K is 5；k1For 0.3.
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| CN201310366547.9A CN104422984B (en) | 2013-08-21 | 2013-08-21 | A kind of light extraction design method |
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| CN104422984A CN104422984A (en) | 2015-03-18 |
| CN104422984B true CN104422984B (en) | 2018-01-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110319375B (en) * | 2018-03-30 | 2022-02-15 | 松下知识产权经营株式会社 | Lighting device |
| CN108680987B (en) * | 2018-06-29 | 2019-10-15 | 福州大学 | A design method for dot distribution of liquid crystal display light guide plate |
| CN108828708B (en) * | 2018-06-29 | 2019-08-09 | 福州大学 | A design method for dot distribution on the bottom surface of a side-entry light guide plate |
| CN110398801B (en) * | 2019-07-31 | 2020-09-04 | 江南大学 | Light guide plate scattering mesh point design method based on scattering efficiency |
| CN112762413A (en) * | 2019-11-04 | 2021-05-07 | 山西宇皓新型光学材料有限公司 | Light guide plate mesh point preparation method and light guide plate |
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| CN101120270A (en) * | 2004-12-23 | 2008-02-06 | 通用电气公司 | Optical substrate and manufacturing method thereof |
| CN101672981A (en) * | 2008-09-12 | 2010-03-17 | 清华大学 | Method for designing and manufacturing light guide plate |
| CN202101082U (en) * | 2011-06-14 | 2012-01-04 | 创维液晶器件(深圳)有限公司 | Backlight module and LCD (liquid crystal display) device |
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| US8998478B2 (en) * | 2011-04-20 | 2015-04-07 | Rambus Delaware Llc | Lighting assembly |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101120270A (en) * | 2004-12-23 | 2008-02-06 | 通用电气公司 | Optical substrate and manufacturing method thereof |
| CN101672981A (en) * | 2008-09-12 | 2010-03-17 | 清华大学 | Method for designing and manufacturing light guide plate |
| CN202101082U (en) * | 2011-06-14 | 2012-01-04 | 创维液晶器件(深圳)有限公司 | Backlight module and LCD (liquid crystal display) device |
Non-Patent Citations (1)
| Title |
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| 一种圆形导光板散射网点的设计与仿真;李建功 等;《华侨大学学报》;20120930;第33卷(第5期);全文 * |
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Effective date of registration: 20170925 Address after: 523000 Guangdong city of Dongguan province Changping Zhen Heng Jiang Jiang Xia Heng Industrial Road, set up a file Applicant after: KINGSUN OPTOELECTRONIC CO., LTD. Address before: 523565 Guangdong province Dongguan city Changping town Hengjiang Dongguan KingSun Au Optronics Co set up a file Applicant before: Dongguan Qinshang Photoelectric Co., Ltd. |
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