CN102829435A - 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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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 the 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 (Light Emitting Diode, light emitting diode) module backlight, led light source is positioned at the bottom of backing structure.By upwards bright dipping after the reaction of reflectance coating, through certain space light mixing distance, again by optical thin films such as diffuser plate modulation back bright dipping.So the thickness of each optical module and the integral thickness that the required space light mixing distance of LED has determined module backlight.Particularly light source and required light mixing distance thereof have increased the thickness of backing structure, make that to adopt LCD (Liquid Crystal Display, the LCD) contour structures of direct-type backlight more thick and heavy.Need carry out the site design to common diffuser plate, the diffusion through the site makes the light mixing distance of light shorten, and realizes the LCD profile slimming of direct-type backlight for this reason.Site design to diffuser plate is to carry out manual adjustment according to optical effect at present, but manual adjustment has increased LGP developer's workload, causes 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 present invention provides a kind of diffuser plate site generation method of LED-backlit module, may further comprise the steps:
The simulation LED curve of light distribution;
Obtain the illumination of diffuser plate according to the said LED curve of light distribution;
Generate the density fonction of site according to the transmissivity of the illumination of said diffuser plate and diffuser plate;
Adopt macroprogram VBA (Visual Basic for Applications) developing instrument to generate the area distribution of site.
Preferably, the said simulation LED curve of light distribution comprises:
Set up simulation plane, diffuser plate bottom;
Obtain both sides, the luminous angle of LED at span and the corresponding relation of light mixing distance and light intensity of simulation on the plane.
Preferably, the said illumination of obtaining diffuser plate according to the LED curve of light distribution comprises:
Obtain the illumination of single LEDs by following formula:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2；
Wherein, I is a light intensity, and a is luminous angle, and d is a light mixing distance, and r is the site radius;
The illumination stack of two LED lamp is obtained two stack Illumination Distribution function E (x) between the lamp;
Simulation plane, diffuser plate bottom is converted into the diffuser plate of being with stipple pattern, and obtains the illumination of diffuser plate by following formula:
E=E（x）*（Y*T1*T2+(1-Y)*T1)）；
Wherein E is the illumination of diffuser plate, and T1 is a visible light transmissivity, and T2 is the printing ink visible light transmissivity, and Y is the density function of printing ink.
Preferably, the transmissivity of said illumination and diffuser plate according to the diffuser plate density fonction that generates the site comprises:
The object illumination of diffuser plate is set according to following formula:
E=E (x) MIN*T1; Wherein, E (x) MIN is the minimum of a value of stack Illumination Distribution function E (x);
Obtain the dot density function according to following formula:
Y=?(E(x)MIN*/E（x）-1)/(?T2-1)。
Preferably, the said employing macroprogram VBA developing instrument area distribution that generates the site comprises:
Set the center point coordinate of site;
Confirm the site radius by following formula, and generate the area distribution of site with this site radius:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is the site radius, and x-pitch is the x axle axial distance of central point to next site, and y-pitch is the y axle axial distance of central point to 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 is used to simulate the LED curve of light distribution;
Diffuser plate illumination acquisition module is used for obtaining according to the said LED curve of light distribution illumination of diffuser plate;
The density fonction generation module is used for generating according to the transmissivity of the Illumination Distribution of said diffuser plate and diffuser plate the density fonction of site;
The network point distribution generation module is used to adopt macroprogram VBA developing instrument to generate the area distribution of site.
Preferably, said LED light intensity analog module comprises:
The unit is set up on the simulation plane, is used to set up simulation plane, diffuser plate bottom;
The Relationship of Light intensity is confirmed the unit, is used to obtain span and the corresponding relation of light mixing distance and light intensity of both sides, the luminous angle of LED on the simulation plane.
Preferably, said diffuser plate illumination acquisition module specifically is used for:
Obtain the illumination of single LEDs by following formula:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2；
Wherein, I is a light intensity, and a is luminous angle, and d is a light mixing distance, and r is the site radius;
The illumination stack of two LED lamp is obtained two stack Illumination Distribution function E (x) between the lamp;
Simulation plane, diffuser plate bottom is converted into the diffuser plate of being with stipple pattern, and obtains the illumination of diffuser plate by following formula:
E=E（x）*（Y*T1*T2+(1-Y)*T1)）；
Wherein E is the illumination of diffuser plate, and T1 is a visible light transmissivity, and T2 is the printing ink visible light transmissivity, and Y is the density function of printing ink.
Preferably, said density fonction generation module specifically is used for:
The object illumination of diffuser plate is set according to following formula:
E=E (x) MIN*T1; Wherein, E (x) MIN is the minimum of a value of stack Illumination Distribution function E (x);
Obtain the dot density function according to following formula:
Y=?(E(x)MIN*/E（x）-1)/(?T2-1)。
Preferably, said network point distribution generation module specifically is used for:
Set the center point coordinate of site;
Confirm the site radius by following formula, and generate the area distribution of site with this site radius:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is the site radius, and x-pitch is the x axle axial distance of central point to next site, and y-pitch is the y axle axial distance of central point to next site.
The present invention proposes the diffuser plate screen dot design method that is applied to have in the ultra-thin direct-light type LED backlight module stipple pattern.Through the simulation LED curve of light distribution; Calculate the Illumination Distribution of diffuser plate bottom, calculate the density fonction of site, adopt the VBA developing instrument that dot area is set and distribute according to the diffuser plate transmissivity; Improve the development rate of LGP, saved the LGP cost of developing.
Description of drawings
Fig. 1 is the syndeton sketch map among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 2 is the lighting angle of expression LED and the corresponding relation figure of light intensity among 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 among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 4 is for concerning sketch map between the luminous angle of LED, light mixing distance and the light intensity among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 5 is the corresponding curve synoptic diagram of luminous angle among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention with light intensity;
Fig. 6 is the sketch map that concerns of two LED lamp among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 7 is simulation planar illumination and curve synoptic diagram thereof among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Fig. 8 is the illumination sketch map of diffuser plate among 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 among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Figure 10 is the distribution schematic diagram of site among diffuser plate site generating apparatus one embodiment of LED-backlit module of the present invention;
Figure 11 is the schematic flow sheet among diffuser plate site generation method one embodiment of LED-backlit module of the present invention;
Figure 12 is the flow chart of steps of the simulation LED curve of light distribution among 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 will combine embodiment, further specify with reference to accompanying drawing.
The specific embodiment
Should be appreciated that specific embodiment described herein only is used to explain the present invention, and be not used in qualification the present invention.
With reference to Fig. 1, the present invention provides a kind of diffuser plate site generating apparatus of LED-backlit module, and it comprises:
LED light intensity analog module 10 is used to simulate the LED curve of light distribution;
Diffuser plate illumination acquisition module 20 is used for obtaining according to the said LED curve of light distribution illumination of diffuser plate;
Density fonction generation module 30 is used for generating according to the transmissivity of the Illumination Distribution of said diffuser plate and diffuser plate the density fonction of site;
Network point distribution generation module 40 is used to adopt 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 the ultra-thin direct-light type LED backlight module stipple pattern.Through 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 the diffuser plate transmissivity, and network point distribution generation module 40 adopts the VBA developing instrument that dot area is set and distributes; Improve the development rate of LGP, saved the LGP cost of developing.
Concrete, LED light intensity analog module 10 can obtain the curve of light distribution of LED with the mode of curve match, with reference to Fig. 2; Fig. 2 is the lighting angle of expression LED and the corresponding relation figure of light intensity; Light intensity was 0.086I when lighting angle was 0 °, and light intensity was I when lighting angle a was 75 °, then I=I (a).With reference to Fig. 3, in the embodiment of the invention, LED light intensity analog module 10 comprises:
Unit 11 is set up on the simulation plane, is used to set up simulation plane, diffuser plate bottom;
The Relationship of Light intensity is confirmed unit 12, is used to obtain span and the corresponding relation of light mixing distance and light intensity of both sides, the luminous angle of LED on the simulation plane.
Like Fig. 4 and shown in Figure 5, the simulation plane is set up unit 11 and is used to set up diffuser plate bottom simulation planar S, and The Relationship of Light intensity is confirmed both sides that unit 12 is used to obtain the luminous angle a of LED span X and the corresponding relation of light mixing distance d and light intensity I on the simulation planar S.Concrete, can know by Fig. 4: X=d*tan (a); When supposing light mixing distance d=15mm, span X is as shown in Figure 5 with the corresponding curve I (X) of light intensity I (a) on the available simulation planar S.
In the embodiment of the invention, diffuser plate illumination acquisition module 20 specifically is used for:
Obtain the illumination of single LEDs by following formula:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2；
Wherein, I is a light intensity, and a is luminous angle, and d is a light mixing distance, and r is the site radius;
The illumination stack of two LED lamp is obtained two stack Illumination Distribution function E (x) between the lamp;
Simulation plane, diffuser plate bottom is converted into the diffuser plate of being with stipple pattern, and obtains the illumination of diffuser plate by following formula:
E=E（x）*（Y*T1*T2+(1-Y)*T1)）；
Wherein E is the illumination of diffuser plate, and T1 is a visible light transmissivity, and T2 is the printing ink visible light transmissivity, and Y is the density function of printing ink.
Concrete, please with reference to Fig. 6 to Fig. 8, the light intensity of LED is I (a), and diffuser plate is positioned at its top d (d is a fixed value) to be located, and then the A illumination of ordering is:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2。
When the lamp of LED lamp when be m, the illumination of two LED lamp superposeed can obtain two stack Illumination Distribution function E (x) between the lamp.With reference to Fig. 7, Fig. 7 be lamp apart from m=84mm, when light mixing distance is 15mm, the simulation planar S illumination.
In the embodiment of the invention, density fonction generation module 30 specifically is used for:
The object illumination of diffuser plate is set according to following formula:
E=E (x) MIN*T1; Wherein, E (x) MIN is the minimum of a value of stack Illumination Distribution function E (x);
Obtain the dot density function according to following formula:
Y=?(E(x)MIN*/E（x）-1)/(?T2-1)。
For making diffuser plate realize the illumination homogeneous, object illumination E=E (x) MIN*T1 is set; 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 curve as shown in Figure 9 of coordinate x and density function Y can obtain through the curve match:
With reference to shown in Figure 10, in the embodiment of the invention, network point distribution generation module 40 can specifically be used for:
Set the center point coordinate of site;
Confirm the site radius by following formula, and generate the area distribution of site with this site radius:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is the site radius, and x-pitch is the x axle axial distance of central point to next site, and y-pitch is the y axle axial distance of central point to next site.
The present invention also provides a kind of diffuser plate site generation method of LED-backlit module, and this method is based on the diffuser plate site generating apparatus of aforementioned LED-backlit module.With reference to shown in Figure 11, in the embodiment of the invention, the diffuser plate site generation method of LED-backlit module may further comprise the steps:
Step S10, the simulation LED curve of light distribution;
Step S20 obtains the illumination of diffuser plate according to the said LED curve of light distribution;
Step S30 generates the density fonction of site according to the transmissivity of the illumination of said diffuser plate and diffuser plate;
Step S40 adopts macroprogram VBA (Visual Basic for Applications) developing instrument to generate the area distribution of site.
For example; Can be through the 10 simulation LED curves of light distribution of the LED light intensity analog module among the 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 the diffuser plate transmissivity, and network point distribution generation module 40 adopts the VBA developing instrument that dot area is set and distributes.
With reference to shown in Figure 12, in the embodiment of the invention, can comprise among the abovementioned steps S10:
Step S11 sets up simulation plane, diffuser plate bottom;
Step S12 obtains both sides, the luminous angle of LED at span and the corresponding relation of light mixing distance and light intensity of simulation on the plane.
For example, set up unit 11 through the simulation plane and set up diffuser plate bottom simulation planar S, confirm both sides that unit 12 obtains the luminous angle a of LED span X and the corresponding relation of light mixing distance d and light intensity I on the simulation planar S through The Relationship of Light intensity.
In the embodiment of the invention, can comprise among the above-mentioned steps S20:
Obtain the illumination of single LEDs by following formula:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2；
Wherein, I is a light intensity, and a is luminous angle, and d is a light mixing distance, and r is the site radius;
The illumination stack of two LED lamp is obtained two stack Illumination Distribution function E (x) between the lamp;
Simulation plane, diffuser plate bottom is converted into the diffuser plate of being with stipple pattern, and obtains the illumination of diffuser plate by following formula:
E=E（x）*（Y*T1*T2+(1-Y)*T1)）；
Wherein E is the illumination of diffuser plate, and T1 is a visible light transmissivity, and T2 is the printing ink visible light transmissivity, and Y is the density function of printing ink.
In the embodiment of the 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) MIN is the minimum of a value of stack Illumination Distribution function E (x);
Obtain the dot density function according to following formula:
Y=?(E(x)MIN*/E（x）-1)/(?T2-1)。
In the embodiment of the invention, above-mentioned steps S40 can comprise:
Set the center point coordinate of site;
Confirm the site radius by following formula, and generate the area distribution of site with this site radius:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is the site radius, and x-pitch is the x axle axial distance of central point to next site, and y-pitch is the y axle axial distance of central point to next site.
More than be merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. the diffuser plate site generation method of a LED-backlit module is characterized in that, may further comprise the steps:
The simulation LED curve of light distribution;
Obtain the illumination of diffuser plate according to the said LED curve of light distribution;
Generate the density fonction of site according to the transmissivity of the illumination of said diffuser plate and diffuser plate;
Adopt macroprogram VBA developing instrument to generate the area distribution of site.
2. the diffuser plate site generation method of LED-backlit module as claimed in claim 1 is characterized in that, the step of the said simulation LED curve of light distribution comprises:
Set up simulation plane, diffuser plate bottom;
Obtain both sides, the luminous angle of LED at span and the corresponding relation of light mixing distance and light intensity of simulation on the plane.
3. according to claim 1 or claim 2 the diffuser plate site generation method of LED-backlit module is characterized in that, the said step of obtaining the illumination of diffuser plate according to the curve of light distribution comprises:
Obtain the illumination of single LEDs by following formula:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2；
Wherein, I is a light intensity, and a is luminous angle, and d is a light mixing distance, and r is the site radius;
The illumination stack of two LED lamp is obtained two stack Illumination Distribution function E (x) between the lamp;
Simulation plane, diffuser plate bottom is converted into the diffuser plate of being with stipple pattern, and obtains the illumination of diffuser plate by following formula:
E=E（x）*（Y*T1*T2+(1-Y)*T1)）；
Wherein E is the illumination of diffuser plate, and T1 is a visible light transmissivity, and T2 is the printing ink visible light transmissivity, and Y is the density function of printing ink.
4. the diffuser plate site generation method of LED-backlit module as claimed in claim 3 is characterized in that, the step that the transmissivity of said illumination and diffuser plate according to 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) MIN is the minimum of a value of stack Illumination Distribution function E (x);
Obtain the dot density function according to following formula:
Y=?(E(x)MIN*/E（x）-1)/(?T2-1)。
5. the diffuser plate site generation method of LED-backlit module as claimed in claim 3 is characterized in that, the step that said employing macroprogram VBA developing instrument generates the area distribution of site comprises:
Set the center point coordinate of site;
Confirm the site radius by following formula, and generate the area distribution of site with this site radius:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is the site radius, and x-pitch is the x axle axial distance of central point to next site, and y-pitch is the y axle axial distance of central point to next site.
6. the diffuser plate site generating apparatus of a LED-backlit module is characterized in that, comprising:
LED light intensity analog module is used to simulate the LED curve of light distribution;
Diffuser plate illumination acquisition module is used for obtaining according to the said LED curve of light distribution illumination of diffuser plate;
The density fonction generation module is used for generating according to the transmissivity of the Illumination Distribution of said diffuser plate and diffuser plate the density fonction of site;
The network point distribution generation module is used to adopt macroprogram VBA developing instrument to generate the area distribution of site.
7. the diffuser plate site generating apparatus of LED-backlit module as claimed in claim 6 is characterized in that, said LED light intensity analog module comprises:
The unit is set up on the simulation plane, is used to set up simulation plane, diffuser plate bottom;
The Relationship of Light intensity is confirmed the unit, is used to obtain span and the corresponding relation of light mixing distance and light intensity of both sides, the luminous angle of LED on the simulation plane.
8. like the diffuser plate site generating apparatus of claim 6 or 7 described LED-backlit modules, it is characterized in that said diffuser plate illumination acquisition module specifically is used for:
Obtain the illumination of single LEDs by following formula:
E=I(a)*cos(a)/?r^2=I(a)*?cos(a)^3/d^2；
Wherein, I is a light intensity, and a is luminous angle, and d is a light mixing distance, and r is the site radius;
The illumination stack of two LED lamp is obtained two stack Illumination Distribution function E (x) between the lamp;
Simulation plane, diffuser plate bottom is converted into the diffuser plate of being with stipple pattern, and obtains the illumination of diffuser plate by following formula:
E=E（x）*（Y*T1*T2+(1-Y)*T1)）；
Wherein E is the illumination of diffuser plate, and T1 is a visible light transmissivity, and T2 is the printing ink visible light transmissivity, and Y is the density function of printing ink.
9. the diffuser plate site generating apparatus of LED-backlit module as claimed in claim 8 is characterized in that, said density fonction generation module specifically is used for:
The object illumination of diffuser plate is set according to following formula:
E=E (x) MIN*T1; Wherein, E (x) MIN is the minimum of a value of stack Illumination Distribution function E (x);
Obtain the dot density function according to following formula:
Y=?(E(x)MIN*/E（x）-1)/(?T2-1)。
10. like the diffuser plate site generating apparatus of claim 8 or 9 described LED-backlit modules, it is characterized in that said network point distribution generation module specifically is used for:
Set the center point coordinate of site;
Confirm the site radius by following formula, and generate the area distribution of site with this site radius:
R=(Y*x-pitch*y-pitch) ^0.5, wherein r is the site radius, and x-pitch is the x axle axial distance of central point to next site, and y-pitch is the y axle axial distance of central point to next site.
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| 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 |
| WO2017177729A1 (en) * | 2016-04-14 | 2017-10-19 | 京东方科技集团股份有限公司 | Apparatus and system for simulating light guide plate, backlight module, and test method |
| US10353131B2 (en) | 2016-04-14 | 2019-07-16 | Boe Technology Group Co., Ltd. | Device, system, backlight module and test method for simulating light guide plate |
| WO2019037386A1 (en) * | 2017-08-25 | 2019-02-28 | 江南大学 | Method for quickly determining and optimizing light emission quality of light guide plate based on image processing technology |
| US11055839B2 (en) | 2017-08-25 | 2021-07-06 | Jiangnan University | Method for fast judging and optimizing light emitting quality of light guide plate based on image processing technology |
| CN110389445A (en) * | 2019-07-25 | 2019-10-29 | 福州大学 | A kind of light guide plate mesh point distribution design method that light-emitting uniformity is high |
| CN112068312A (en) * | 2020-09-18 | 2020-12-11 | 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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