CN102829435B - Method and device for producing lattice points of diffusion plate of light-emitting diode (LED) backlight module - Google Patents
Method and device for producing lattice points of diffusion plate of light-emitting diode (LED) backlight module Download PDFInfo
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- CN102829435B CN102829435B CN201210322611.9A CN201210322611A CN102829435B CN 102829435 B CN102829435 B CN 102829435B CN 201210322611 A CN201210322611 A CN 201210322611A CN 102829435 B CN102829435 B CN 102829435B
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Abstract
The invention discloses a method for producing the lattice points of a diffusion plate of a light-emitting diode (LED) backlight module, which comprises the following steps of simulating an LED light distribution curve; obtaining the illuminance of the diffusion plate according to the LED light distribution curve; generating the density distribution function of the lattice points according to the illuminance and transmittance of the diffusion plate; and adopting a macroprogram visual basic for application (VBA) development tool to generate the area distribution of the lattice points. The invention further discloses a device for producing the lattice points of the diffusion plate of the LED backlight module. Through the method and the device for producing the lattice points of the diffusion plate of the LED backlight module, the development speed of a light guide plate can be improved, and the development cost of the light guide plate is saved.
Description
Technical field
The present invention relates to LCD Technology field, particularly a kind of diffuser plate site of LED-backlit module generates method and apparatus.
Background technology
As everyone knows, in traditional straight-down negative LED (LightEmittingDiode, light emitting diode) backlight module, LED light source is positioned at the bottom of backing structure.By the backward upper bright dipping of reaction of reflectance coating, through certain space light mixing distance, then by bright dipping after the optical thin film modulation such as diffuser plate.So the thickness of each optical module and the integral thickness that the required space light mixing distance of LED has determined backlight module.Particularly light source and required light mixing distance thereof, increased the thickness of backing structure, makes to adopt LCD (LiquidCrystalDisplay, the liquid crystal display) contour structures of direct-type backlight more thick and heavy.Need common diffuser plate to carry out net-pont design, the diffusion by site shortens the light mixing distance of light, realizes the LCD profile slimming of direct-type backlight for this reason.To the net-pont design of diffuser plate, be manually to adjust according to optical effect at present, but manually adjust the workload that has increased LGP developer, cause development cost higher.
Summary of the invention
Main purpose of the present invention is to provide a kind of diffuser plate site generation method of LED-backlit module, is intended to solve the high technical problem of the open cost of prior art.
In order to realize goal of the invention, the invention provides a kind of diffuser plate site generation method of LED-backlit module, comprise the following steps:
The simulation LED curve of light distribution;
According to the described LED curve of light distribution, obtain the illumination of diffuser plate;
According to the transmissivity of the illumination of described diffuser plate and diffuser plate, generate the density fonction of site;
Adopt macroprogram VBA (VisualBasicforApplications) developing instrument to generate the area distribution of site.
Preferably, the described simulation LED curve of light distribution comprises:
Set up diffuser plate bottom simulation plane;
Obtain LED light emitting anger both sides in simulation the span in plane and the corresponding relation of light mixing distance and light intensity.
Preferably, the described illumination of obtaining diffuser plate according to the LED curve of light distribution comprises:
Obtain as follows the illumination of single LEDs:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2；
Wherein, I is light intensity, and a is light emitting anger, and d is light mixing distance, and r is site radius;
The illumination stack of two LED lamp is obtained to two stack Illumination Distribution function E (x) between lamp;
Simulation plane in diffuser plate bottom is converted into the diffuser plate with stipple pattern, and obtains as follows the illumination of diffuser plate:
E＝E(x)*(Y*T1*T2+(1-Y)*T1))；
The illumination that wherein E is diffuser plate, T1 is visible light transmissivity, T2 is ink visible light transmissivity, the density function that Y is ink.
Preferably, the density fonction of the described generation of the transmissivity according to the illumination of diffuser plate and diffuser plate site comprises:
The object illumination of diffuser plate is set according to following formula:
E=E (x)
mIN* T1; Wherein, E (x)
mINminimum of a value for stack Illumination Distribution function E (x);
According to following formula, obtain dot density function:
Y＝(E(x)MIN/E(x)-1)/(T2-1)。
Preferably, the area distribution of described employing macroprogram VBA developing instrument generation site comprises:
Set the center point coordinate of site;
Determine as follows site radius, and with this site radius, generate the area distribution of site:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is site radius, and centered by x-pitch, point is to the x axle axial distance of next site, and centered by y-pitch, point is to the y axle axial distance of next site.
The present invention also provides a kind of diffuser plate site generating apparatus of LED-backlit module, and it comprises:
LED light intensity analog module, for simulating the LED curve of light distribution;
Diffuser plate illumination acquisition module, for obtaining the illumination of diffuser plate according to the described LED curve of light distribution;
Density fonction generation module, for generating the density fonction of site according to the transmissivity of the Illumination Distribution of described diffuser plate and diffuser plate;
Network point distribution generation module, for adopting macroprogram VBA developing instrument to generate the area distribution of site.
Preferably, described LED light intensity analog module comprises:
Simulation plane is set up unit, for setting up diffuser plate bottom simulation plane;
The Relationship of Light intensity determining unit, for obtain LED light emitting anger both sides in simulation the span in plane and the corresponding relation of light mixing distance and light intensity.
Preferably, described diffuser plate illumination acquisition module specifically for:
Obtain as follows the illumination of single LEDs:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2；
Wherein, I is light intensity, and a is light emitting anger, and d is light mixing distance, and r is site radius;
The illumination stack of two LED lamp is obtained to two stack Illumination Distribution function E (x) between lamp;
Simulation plane in diffuser plate bottom is converted into the diffuser plate with stipple pattern, and obtains as follows the illumination of diffuser plate:
E＝E(x)*(Y*T1*T2+(1-Y)*T1))；
The illumination that wherein E is diffuser plate, T1 is visible light transmissivity, T2 is ink visible light transmissivity, the density function that Y is ink.
Preferably, described density fonction generation module specifically for:
The object illumination of diffuser plate is set according to following formula:
E=E (x)
mIN* T1; Wherein, E (x)
mINminimum of a value for stack Illumination Distribution function E (x);
According to following formula, obtain dot density function:
Y＝(E(x)MIN/E(x)-1)/(T2-1)。
Preferably, described network point distribution generation module specifically for:
Set the center point coordinate of site;
Determine as follows site radius, and with this site radius, generate the area distribution of site:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is site radius, and centered by x-pitch, point is to the x axle axial distance of next site, and centered by y-pitch, point is to the y axle axial distance of next site.
The present invention proposes the diffuser plate screen dot design method that is applied to have in ultra-thin direct-light type LED backlight module stipple pattern.By the simulation LED curve of light distribution, calculate the Illumination Distribution of diffuser plate bottom, according to diffuser plate transmissivity, calculate the density fonction of site, adopt VBA developing instrument that dot area is set and distribute, improve the development rate of LGP, saved the cost of LGP exploitation.
Accompanying drawing explanation
Fig. 1 is the syndeton schematic diagram in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 2 represents the lighting angle of LED and the corresponding relation figure of light intensity in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 3 is the structural representation of LED light intensity analog module in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 4 is the schematic diagram that is related between LED light emitting anger in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention, light mixing distance and light intensity;
Fig. 5 is the corresponding curve synoptic diagram of light emitting anger and light intensity in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 6 be in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention two LED lamp be related to schematic diagram;
Fig. 7 simulates planar illumination and curve synoptic diagram thereof in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 8 is the illumination schematic diagram of diffuser plate in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 9 is the curve synoptic diagram of diffuser plate illumination in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Figure 10 is the distribution schematic diagram of site in diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Figure 11 is the schematic flow sheet in diffuser plate site generation method one embodiment of LED-backlit module of the present invention;
Figure 12 simulates the flow chart of steps of the LED curve of light distribution in diffuser plate site generation method one embodiment of LED-backlit module of the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Should be appreciated that specific embodiment described herein, only for explaining the present invention, is not intended to limit the present invention.
With reference to Fig. 1, the invention provides a kind of diffuser plate site generating apparatus of LED-backlit module, it comprises:
LED light intensity analog module 10, for simulating the LED curve of light distribution;
Diffuser plate illumination acquisition module 20, for obtaining the illumination of diffuser plate according to the described LED curve of light distribution;
Density fonction generation module 30, for generating the density fonction of site according to the transmissivity of the Illumination Distribution of described diffuser plate and diffuser plate;
Network point distribution generation module 40, for adopting macroprogram VBA developing instrument to generate the area distribution of site.
The present invention proposes the diffuser plate screen dot design method that is applied to have in ultra-thin direct-light type LED backlight module stipple pattern.By the LED light intensity analog module 10 simulation LED curves of light distribution, diffuser plate illumination acquisition module 20 calculates the Illumination Distribution of diffuser plate bottom, density fonction generation module 30 calculates the density fonction of site according to diffuser plate transmissivity, network point distribution generation module 40, adopting VBA developing instrument that dot area is set distributes, improve the development rate of LGP, saved the cost of LGP exploitation.
Concrete, LED light intensity analog module 10 can obtain by the mode of curve the curve of light distribution of LED, with reference to Fig. 2, Fig. 2 is for representing the lighting angle of LED and the corresponding relation figure of light intensity, when lighting angle is 0 °, light intensity is 0.086I, when lighting angle a is 75 °, light intensity is I, I=I (a).With reference to Fig. 3, in the embodiment of the present invention, LED light intensity analog module 10 comprises:
Simulation plane is set up unit 11, for setting up diffuser plate bottom simulation plane;
The Relationship of Light intensity determining unit 12, for obtain LED light emitting anger both sides in simulation the span in plane and the corresponding relation of light mixing distance and light intensity.
As shown in Figure 4 and Figure 5, simulation plane is set up unit 11 for setting up diffuser plate bottom simulation planar S, and the Relationship of Light intensity determining unit 12 is the span X in simulation planar S and the corresponding relation of light mixing distance d and light intensity I for the both sides that obtain LED light emitting anger a.Concrete, as shown in Figure 4: X=d*tan (a); While supposing light mixing distance d=15mm, in available simulation planar S, the corresponding curve I (X) of span X and light intensity I (a) as shown in Figure 5.
In the embodiment of the present invention, diffuser plate illumination acquisition module 20 specifically for:
Obtain as follows the illumination of single LEDs:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2；
Wherein, I is light intensity, and a is light emitting anger, and d is light mixing distance, and r is site radius;
The illumination stack of two LED lamp is obtained to two stack Illumination Distribution function E (x) between lamp;
Simulation plane in diffuser plate bottom is converted into the diffuser plate with stipple pattern, and obtains as follows the illumination of diffuser plate:
E＝E(x)*(Y*T1*T2+(1-Y)*T1))；
The illumination that wherein E is diffuser plate, T1 is visible light transmissivity, T2 is ink visible light transmissivity, the density function that Y is ink.
Concrete, please refer to Fig. 6 to Fig. 8, the light intensity of LED is I (a), and the diffuser plate side of being located thereon d (d is fixed value) locates, and the illumination that A is ordered is:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2。
When the lamp distance of LED lamp is m, the illumination stack of two LED lamp can be obtained to two stack Illumination Distribution function E (x) between lamp.With reference to Fig. 7, Fig. 7 be lamp apart from m=84mm, when light mixing distance is 15mm, simulation planar S illumination.
In the embodiment of the present invention, density fonction generation module 30 specifically for:
The object illumination of diffuser plate is set according to following formula:
E=E (x)
mIN* T1; Wherein, E (x)
mINminimum of a value for stack Illumination Distribution function E (x);
According to following formula, obtain dot density function:
Y＝(E(x)MIN/E(x)-1)/(T2-1)。
For making diffuser plate realize illumination homogeneous, Offered target illumination E=E (x) MIN*T1; According to dot density function Y=(E (x)
mIN*/E (x)-1)/(T2-1), get T1=70%, T2=15%, can obtain diffuser plate illumination E=E (x) * (Y*70%*40%+ (1-Y) * 70%))=E (x) * (0.7-0.32*Y).
E (x)
mIN=0.00036, the relation of coordinate x and density function Y is curve as shown in Figure 9, by curve, can obtain:
Y＝-0.00000000004899055592934850000*x
5-0.00000007053558364728540000000*x
4-0.00001483076526538980000000000*x
3-0.00097339232226530200000000000*x
2-0.00956422985433135000000000000*x+0625717940996768
The curvilinear function of matching herein requires slope variation mild, can not have slope catastrophe point, avoids occurring the sudden change of diffuser plate illumination.
Shown in Figure 10, in the embodiment of the present invention, network point distribution generation module 40 can be specifically for:
Set the center point coordinate of site;
Determine as follows site radius, and with this site radius, generate the area distribution of site:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is site radius, and centered by x-pitch, point is to the x axle axial distance of next site, and centered by y-pitch, point is to the y axle axial distance of next site.
The present invention also provides a kind of diffuser plate site generation method of LED-backlit module, the diffuser plate site generating apparatus of the method based on aforementioned LED-backlit module.Shown in Figure 11, in the embodiment of the present invention, the diffuser plate site generation method of LED-backlit module comprises the following steps:
Step S10, the simulation LED curve of light distribution;
Step S20, obtains the illumination of diffuser plate according to the described LED curve of light distribution;
Step S30, according to the density fonction of the transmissivity generation site of the illumination of described diffuser plate and diffuser plate;
Step S40, adopts macroprogram VBA (VisualBasicforApplications) developing instrument to generate the area distribution of site.
For example, can be by the LED light intensity analog module 10 simulation LED curves of light distribution in aforementioned means embodiment, diffuser plate illumination acquisition module 20 calculates the Illumination Distribution of diffuser plate bottom, density fonction generation module 30 calculates the density fonction of site according to diffuser plate transmissivity, network point distribution generation module 40, adopts VBA developing instrument that dot area is set and distributes.
Shown in Figure 12, in the embodiment of the present invention, in abovementioned steps S10, can comprise:
Step S11, sets up diffuser plate bottom simulation plane;
Step S12, obtain LED light emitting anger both sides in simulation the span in plane and the corresponding relation of light mixing distance and light intensity.
For example, by simulation plane, set up unit 11 and set up diffuser plate bottom simulation planar S, the span X of the both sides that obtain LED light emitting anger a by the Relationship of Light intensity determining unit 12 in simulation planar S and the corresponding relation of light mixing distance d and light intensity I.
In the embodiment of the present invention, in above-mentioned steps S20, can comprise:
Obtain as follows the illumination of single LEDs:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2；
Wherein, I is light intensity, and a is light emitting anger, and d is light mixing distance, and r is site radius;
The illumination stack of two LED lamp is obtained to two stack Illumination Distribution function E (x) between lamp;
Simulation plane in diffuser plate bottom is converted into the diffuser plate with stipple pattern, and obtains as follows the illumination of diffuser plate:
E＝E(x)*(Y*T1*T2+(1-Y)*T1))；
The illumination that wherein E is diffuser plate, T1 is visible light transmissivity, T2 is ink visible light transmissivity, the density function that Y is ink.
In the embodiment of the present invention, above-mentioned steps S30 can comprise:
The object illumination of diffuser plate is set according to following formula:
E=E (x)
mIN* T1; Wherein, E (x)
mINminimum of a value for stack Illumination Distribution function E (x);
According to following formula, obtain dot density function:
Y＝(E(x)MIN/E(x)-1)/(T2-1)。
In the embodiment of the present invention, above-mentioned steps S40 can comprise:
Set the center point coordinate of site;
Determine as follows site radius, and with this site radius, generate the area distribution of site:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is site radius, and centered by x-pitch, point is to the x axle axial distance of next site, and centered by y-pitch, point is to the y axle axial distance of next site.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (2)
1. the diffuser plate site generation method of a LED-backlit module, is characterized in that, comprises the following steps:
The simulation LED curve of light distribution;
According to the described LED curve of light distribution, obtain the illumination of diffuser plate;
According to the transmissivity of the illumination of described diffuser plate and diffuser plate, generate the density fonction of site;
Adopt macroprogram VBA developing instrument to generate the area distribution of site;
The described step of obtaining the illumination of diffuser plate according to the curve of light distribution comprises:
Obtain as follows the illumination of single LEDs:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2；
Wherein, I is light intensity, and a is light emitting anger, and d is light mixing distance, and r is site radius;
The illumination stack of two LED lamp is obtained to two stack Illumination Distribution function E (x) between lamp;
Simulation plane in diffuser plate bottom is converted into the diffuser plate with stipple pattern, and obtains as follows the illumination of diffuser plate:
E＝E(x)*(Y*T1*T2+(1-Y)*T1))；
The illumination that wherein E is diffuser plate, T1 is visible light transmissivity, T2 is ink visible light transmissivity, the density function that Y is ink;
The step that the described transmissivity according to the illumination of diffuser plate and diffuser plate generates the density fonction of site comprises:
The object illumination of diffuser plate is set according to following formula:
E=E (x)
mIN* T1; Wherein, E (x)
mINminimum of a value for stack Illumination Distribution function E (x);
According to following formula, obtain dot density function:
Y＝(E(x)
MIN/E(x)-1)/(T2-1)；
The step that described employing macroprogram VBA developing instrument generates the area distribution of site comprises:
Set the center point coordinate of site;
Determine as follows site radius, and with this site radius, generate the area distribution of site:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is site radius, and centered by x-pitch, point is to the x axle axial distance of next site, and centered by y-pitch, point is to the y axle axial distance of next site;
The step of the described simulation LED curve of light distribution comprises:
Set up diffuser plate bottom simulation plane;
Obtain LED light emitting anger both sides in simulation the span in plane and the corresponding relation of light mixing distance and light intensity.
2. a diffuser plate site generating apparatus for LED-backlit module, is characterized in that, comprising:
LED light intensity analog module, for simulating the LED curve of light distribution;
Diffuser plate illumination acquisition module, for obtaining the illumination of diffuser plate according to the described LED curve of light distribution;
Density fonction generation module, for generating the density fonction of site according to the transmissivity of the Illumination Distribution of described diffuser plate and diffuser plate;
Network point distribution generation module, for adopting macroprogram VBA developing instrument to generate the area distribution of site;
Described diffuser plate illumination acquisition module specifically for:
Obtain as follows the illumination of single LEDs:
E＝I(a)*cos(a)/r^2＝I(a)*cos(a)^3/d^2；
Wherein, I is light intensity, and a is light emitting anger, and d is light mixing distance, and r is site radius;
The illumination stack of two LED lamp is obtained to two stack Illumination Distribution function E (x) between lamp;
Simulation plane in diffuser plate bottom is converted into the diffuser plate with stipple pattern, and obtains as follows the illumination of diffuser plate:
E＝E(x)*(Y*T1*T2+(1-Y)*T1))；
The illumination that wherein E is diffuser plate, T1 is visible light transmissivity, T2 is ink visible light transmissivity, the density function that Y is ink;
Described density fonction generation module specifically for:
The object illumination of diffuser plate is set according to following formula:
E=E (x)
mIN* T1; Wherein, E (x)
mINminimum of a value for stack Illumination Distribution function E (x);
According to following formula, obtain dot density function:
Y＝(E(x)
MIN/E(x)-1)/(T2-1)；
Described network point distribution generation module specifically for:
Set the center point coordinate of site;
Determine as follows site radius, and with this site radius, generate the area distribution of site:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is site radius, and centered by x-pitch, point is to the x axle axial distance of next site, and centered by y-pitch, point is to the y axle axial distance of next site;
Described LED light intensity analog module comprises:
Simulation plane is set up unit, for setting up diffuser plate bottom simulation plane;
The Relationship of Light intensity determining unit, for obtain LED light emitting anger both sides in simulation the span in plane and the corresponding relation of light mixing distance and light intensity.
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| CN103698938A (en) * | 2013-12-18 | 2014-04-02 | 京东方科技集团股份有限公司 | Network distribution method and network generation device |
| CN103926746B (en) * | 2014-05-04 | 2016-06-22 | 深圳市华星光电技术有限公司 | Side type curved surface module brightness uniformity ameliorative way |
| CN104930402A (en) * | 2015-05-27 | 2015-09-23 | 深圳同兴达科技股份有限公司 | Method for improving luminance uniformity of backlight module |
| CN105676343B (en) | 2016-04-14 | 2019-01-04 | 京东方科技集团股份有限公司 | For simulating device, system and the backlight module and test method of light guide plate |
| CN107527340B (en) * | 2017-08-25 | 2020-10-09 | 江南大学 | Method for rapidly judging and optimizing light-emitting quality of light guide plate based on image processing technology |
| CN110389445B (en) * | 2019-07-25 | 2021-08-31 | 福州大学 | Light guide plate mesh point distribution design method with high light-emitting uniformity |
| CN112068312B (en) * | 2020-09-18 | 2022-11-01 | 深圳市康冠科技股份有限公司 | Mesh point design method and device of diffusion plate, computer equipment and storage medium |
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| CN101672981A (en) * | 2008-09-12 | 2010-03-17 | 清华大学 | Method for designing and manufacturing light guide plate |
| CN101737720A (en) * | 2009-12-24 | 2010-06-16 | 广州大学 | Screen dot design method of side light type light guide plate of LED light source |
| CN102323672A (en) * | 2011-09-14 | 2012-01-18 | 广州创维平面显示科技有限公司 | Method and device for optimizing mesh point of light guide plate |
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| CN101672981A (en) * | 2008-09-12 | 2010-03-17 | 清华大学 | Method for designing and manufacturing light guide plate |
| CN101737720A (en) * | 2009-12-24 | 2010-06-16 | 广州大学 | Screen dot design method of side light type light guide plate of LED light source |
| CN102323672A (en) * | 2011-09-14 | 2012-01-18 | 广州创维平面显示科技有限公司 | Method and device for optimizing mesh point of light guide plate |
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