CN102074206B - Color correction method, color correction device and LED color correction system - Google Patents

Abstract

The invention discloses a color correction method, a color correction device and an LED color correction system. The color correction method comprises the following steps of: driving three-primary-color LED array plates to emit the light by using three groups of predetermined drive signals; collecting three groups of chrominance values of the light respectively emitted by the three-primary-color LED array plates under the driving of the three groups of predetermined drive signals; acquiring three groups of theory brightness match ratios of three-primary-color LEDs in the three-primary-color LED array plates by using the three groups of collected predetermined drive signals; acquiring three groups of actual brightness match ratios of the three-primary-color LEDs by utilizing the three groups of predetermined drive signals; acquiring color correction coefficients through the three groups of theory brightness match ratios and the three groups of actual brightness match ratios; and correcting the brightness match ratios of the three-primary-color LEDs by using the color correction coefficients so as to generate standard drive signals to realize color correction of the three-primary-color LED array plates.

Description

Color correcting method, colour correcting apparatus and LED color calibration system

Technical field

The present invention relates to a kind of colour correction technology, particularly a kind of color correcting method, colour correcting apparatus and LED color calibration system.

Background technology

At present, the light source in LED display and LED-backlit source mainly by light emitting diode (Light Emitting Diode, hereinafter to be referred as: LED) provide.

LED display is the display screen of the various information such as display text, figure, image, animation, market, video or video recording.LED display is divided into graphic display screen and video display screen, forms by the LED matrix-block.

The LED-backlit source is because its color reducibility has substantially exceeded cathode fluorescent tube (Cold Cathode Fluorescent Lamp; Be called for short: CCFL) backlight, therefore, LCD TV mainly adopts the LED-backlit source.And the dynamic backlight technology in LED-backlit source not only makes the power consumption of the LCD TV that adopts the LED-backlit source greatly reduce, and has also improved the contrast, color representation of LCD TV etc.Simultaneously, very long serviceable life due to the LED-backlit source, can reach 100,000 hours, therefore adopt the life-span of LED-backlit source LCD TV also very long, for example, if calculated in 5 hours by starting shooting every day, one is adopted the LCD TV in LED-backlit source can use nearly 55 years.In addition, it is also not mercurous, good environmental protection.

Concrete, the LED-backlit source of using on LCD TV can be RGB (Red Green Blue, hereinafter to be referred as: RGB) three primary colours, also can the employing multicolor LED-backlit in high-end product the source further improve color representation power, for example, Mitsubishi Electric has issued the liquid crystal display of using six primary colors LED-backlit sources on SID2005.

In prior art, in order to make light that LED sends can satisfy the demand of colourity and brightness, at first gather each primary-color LED at drive signal impulse width modulated (Pulse Width Modulation, hereinafter to be referred as PWM) be chromatic value and the brightness value in 100% situation, and the chromatic value of color according to demand and brightness value, by conversion formula, obtain the driving signal PWM of each three-primary color LED.Then drive corresponding with it three-primary color LED with the driving signal PWM of each three-primary color LED of obtaining and send required color.

To require three-primary color LED array board output white light as example.In the situation that the driving signal PWM of input is 100%, respectively each red LED, green LED and blue led on the three-primary color LED array board are lighted, and the chromatic value of each red LED that collects and brightness value, the chromatic value of each green LED and chromatic value and the brightness value of brightness value and each blue led, according to chromatic value and the predefined standard white photochromism value of the three-primary color LED that collects, adopt formula

$\left[\begin{array}{c}\mathrm{SPr}\\ \mathrm{SPg}\\ \mathrm{SPb}\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}}{\mathrm{yw}}\\ 1\\ \frac{1-\mathrm{xw}-\mathrm{yw}}{\mathrm{yw}}\end{array}\right]---\left(1\right)$

Obtain each three-primary color LED brightness proportioning value, and generate corresponding driving signal PWM according to each brightness proportioning value, then will drive signal PWM and be input in corresponding with it three-primary color LED, thereby make three-primary color LED array board output white light.

But there is error in the driving signal PWM that obtains driving signal PWM and actual Plays, occurs the problems such as color spot and speck on whole screen thereby make.Take above-mentioned three-primary color LED array board output white light as example, it is (0.31 that producer needs three-primary color LED array board outputting standard white light, 0.31), when to three-primary color LED array board input drive signal PWM, gather the red LED chromatic value, green LED chromatic value and the blue led chromatic value that obtain one of them three-primary color LED, be respectively (0.6939,0.3060) (0.175,0.7081) (0.1493,0.0316), the brightness proportioning value of calculating acquisition according to above-mentioned formula is $\left[\begin{array}{c}6.9\\ 18.7\\ 1\end{array}\right],$ But the normal brightness proportioning value of actual this three-primary color LED should for $\left[\begin{array}{c}4.45\\ 12\\ 1\end{array}\right],$ So, according to calculating the brightness proportioning value that obtains $\left[\begin{array}{c}6.9\\ 18.7\\ 1\end{array}\right]$ The driving signal PWM that generates can't make the white light of this three-primary color LED output actual standard.Therefore, for each three-primary color LED on the three-primary color LED array board, the standard of the driving signal PWM of each three-primary color LED that obtains due to calculating and actual each three-primary color LED drives signal and has error, thereby makes the problem that occurs color spot and speck on screen.

Summary of the invention

The purpose of this invention is to provide a kind of color correcting method, colour correcting apparatus and LED color calibration system, show the unevenness such as color spot that difference brings, speck due to three-primary color LED to proofread and correct, thereby make the three-primary color LED display screen of different brightness, colourity or backlight produce uniformly white picture, and then effectively eliminate color spot and speck.

For achieving the above object, the invention provides a kind of color correcting method, comprising:

Luminous with three groups of predefined drive three-primary color LED array boards;

Gather three groups of chromatic values of the light that described three-primary color LED array board sends respectively under the driving of described three groups of predefined driving signals;

Utilize the described three groups of chromatic values that gather to obtain three groups of theoretical brightness proportioning values of three-primary color LED in described three-primary color LED array board;

Utilize described three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values of described three-primary color LED;

Obtain color correction coefficient by described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values;

Utilize described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the generation standard drive signal to realize the colour correction of described three-primary color LED array board.

For achieving the above object, the present invention also provides a kind of colour correcting apparatus, wherein, comprising:

Drive signal and preset module, be used for luminous with three groups of predefined drive three-primary color LED array boards;

The chromatic value acquisition module is used for gathering three groups of chromatic values of the light that described three-primary color LED array board sends respectively under the driving of described three groups of predefined driving signals;

Theoretical brightness proportioning value generation module is used for utilizing the described three groups of chromatic values that gather to obtain three groups of theoretical brightness proportioning values of described three-primary color LED array board three-primary color LED;

Intrinsic brilliance proportioning value generation module is used for utilizing described three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values of described three-primary color LED;

The color correction coefficient generation module is used for obtaining color correction coefficient by described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values;

Standard drives the signal generation module, be used for utilizing described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the generation standard drives signal to realize the colour correction of described three-primary color LED array board.

For achieving the above object, the present invention also provides a kind of LED color calibration system that comprises colour correcting apparatus, also comprises described three-primary color LED array board, harvester and LED control circuit, wherein,

Described three-primary color LED array board is used for receiving by described LED control circuit the described three groups of predefined driving signals or the described standard that are sent by described colour correcting apparatus and drives signal;

Described harvester is used for gathering the luminous described three groups of chromatic values of the described three-primary color LED array board of described three groups of predefined drive.

As shown from the above technical solution, the present invention is by three groups of intrinsic brilliance proportioning values and three groups of theoretical brightness proportioning values, generate color correction coefficient, thereby the original intensity proportioning value that is generated by three-primary color LED initial chroma value is proofreaied and correct, drive with the generation standard colour correction that signal is realized the three-primary color LED array board, thereby the three-primary color LED display screen that the LED that makes different brightness, colourity forms or backlight produce uniformly white picture, and then have saved the cost in three-primary color LED display screen and three primary color LED backlight source.

Description of drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

The schematic flow sheet of the color correcting method that Fig. 1 provides for the embodiment of the present invention one;

The structural representation of the colour correcting apparatus that Fig. 2 provides for the embodiment of the present invention two;

The structural representation of the LED color calibration system that Fig. 3 provides for the embodiment of the present invention three.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

Embodiment one

The schematic flow sheet of the color correcting method that Fig. 1 provides for the embodiment of the present invention one, the concrete steps of this color correcting method comprise:

Step 11, luminous with three groups of predefined drive three-primary color LED array boards;

Three groups of chromatic values of the light that step 12, collection three-primary color LED array board send under the driving of three groups of predefined driving signals respectively;

Three groups of chromatic values that step 13, utilization gather obtain three groups of theoretical brightness proportioning values of three-primary color LED in the three-primary color LED array board;

Step 14, utilize three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values of three-primary color LED;

Step 15, obtain color correction coefficient by three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values;

Step 16, utilize color correction coefficient that the brightness proportioning value of three-primary color LED is proofreaied and correct, thereby the generation standard drive signal to realize the colour correction of three-primary color LED array board.

In step 12, respectively to three groups of predefined driving signals of each three-primary color LED input on the three-primary color LED array board, and gather respectively each three-primary color LED at three groups of chromatic values inputting the light that sends under three groups of predefined driving signals, take three-primary color LED array board output white light as example, under three groups of predefined driving signals of input, the chromatic value of each three-primary color LED array board that collects is the white light chromatic value.Three groups of white light chromatic values can be expressed as (xw1, yw1), (xw2, yw2), (xw3, yw3).

in step 13, concrete, initial red LED chromatic value according to three-primary color LED, initial green LED chromatic value and initial blue led chromatic value, adopt formula (1), three groups of theoretical brightness proportioning values of three-primary color LED in the three-primary color LED array board both can have been obtained, take above-mentioned three-primary color LED array board output white light as example, be that the 100% red LED chromatic value that collects is expressed as (xr in the situation that drive signal PWM, yr), the green LED chromatic value is expressed as (xg, yg), the blue led chromatic value is expressed as (xb, yb), adopt formula (1) can obtain respectively three groups of theoretical brightness proportioning values, be respectively:

$\left[\begin{array}{c}{\mathrm{SPr}}_1\\ {\mathrm{SPg}}_1\\ {\mathrm{SPb}}_1\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}1}{\mathrm{yw}1}\\ 1\\ \frac{1-\mathrm{xw}1-\mathrm{yw}1}{\mathrm{yw}1}\end{array}\right]---\left(2\right)$

$\left[\begin{array}{c}{\mathrm{SPr}}_2\\ {\mathrm{SPg}}_2\\ {\mathrm{SPb}}_2\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}2}{\mathrm{yw}2}\\ 1\\ \frac{1-\mathrm{xw}2-\mathrm{yw}2}{\mathrm{yw}2}\end{array}\right]---\left(3\right)$

$\left[\begin{array}{c}{\mathrm{SPr}}_3\\ {\mathrm{SPg}}_3\\ {\mathrm{SPb}}_3\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}3}{\mathrm{yw}3}\\ 1\\ \frac{1-\mathrm{xw}3-\mathrm{yw}3}{\mathrm{yw}3}\end{array}\right]---\left(4\right)$

Wherein, SPr ₁, SPg ₁And SPb ₁Be respectively the proportioning value of first group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

SPr ₂, SPg ₂And SPb ₂Be respectively the proportioning value of second group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

SPr ₃, SPg ₃And SPb ₃Be respectively the proportioning value of the 3rd group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness.

In the present embodiment, by by the theoretical brightness proportioning of three groups of intrinsic brilliance proportioning values and three groups values, generate color correction coefficient, thereby the original intensity proportioning value that is generated by three-primary color LED initial chroma value is proofreaied and correct, drive with the generation standard colour correction that signal is realized the three-primary color LED array board, thereby the three-primary color LED display screen that the LED that makes different brightness, colourity forms or backlight produce uniformly white picture, and then have saved the cost in three-primary color LED display screen and three primary color LED backlight source.

On the basis of above-described embodiment, take three-primary color LED array board output white light as example, step 14 is specially:

Utilize three groups of predefined driving signals, and according to the initial red LED brightness value of three-primary color LED, initial green LED brightness value and initial blue led brightness value, adopt formula

$\left[\begin{array}{c}{\mathrm{Lr}}_n\\ {\mathrm{Lg}}_n\\ {\mathrm{Lb}}_n\end{array}\right]=\left[\begin{array}{c}{\mathrm{PWMr}}_n*\mathrm{Lr}\\ {\mathrm{PWMg}}_n*\mathrm{Lb}\\ {\mathrm{PWMb}}_n*\mathrm{Lg}\end{array}\right]---\left(5\right)$

Generate three groups of intrinsic brilliance proportioning values, wherein, Lr _n, Lg _nAnd Lb _nThe proportioning value, the proportioning value of actual green LED brightness and the proportioning value of actual blue LED brightness that represent the actual red LED brightness of n group;

PWMr _n, PWMg _nAnd PWMb _nThe driving signal that represents n group predefined red LED, green LED and blue led;

Lr, Lb and Lg represent initial red LED brightness value, initial blue led brightness value and initial green LED brightness value.

Concrete, can obtain respectively three groups of intrinsic brilliance proportioning values by formula (5) and be:

$\left[\begin{array}{c}\mathrm{Lr}1\\ \mathrm{Lg}1\\ \mathrm{Lb}1\end{array}\right]=\left[\begin{array}{c}\mathrm{PWMr}1*\mathrm{Lr}\\ \mathrm{PWMg}1*\mathrm{Lb}\\ \mathrm{PWMb}1*\mathrm{Lg}\end{array}\right]---\left(6\right)$

$\left[\begin{array}{c}\mathrm{Lr}2\\ \mathrm{Lg}2\\ \mathrm{Lb}2\end{array}\right]=\left[\begin{array}{c}\mathrm{PWMr}2*\mathrm{Lr}\\ \mathrm{PWMg}2*\mathrm{Lb}\\ \mathrm{PWMb}2*\mathrm{Lg}\end{array}\right]---\left(7\right)$

$\left[\begin{array}{c}\mathrm{Lr}3\\ \mathrm{Lg}3\\ \mathrm{Lb}3\end{array}\right]=\left[\begin{array}{c}\mathrm{PWMr}3*\mathrm{Lr}\\ \mathrm{PWMg}3*\mathrm{Lb}\\ \mathrm{PWMb}3*\mathrm{Lg}\end{array}\right]---\left(8\right)$

On the basis of above-described embodiment, take three-primary color LED array board output white light as example, step 15 is specially:

Respectively with three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values, the following formula of substitution:

$\left[\begin{array}{c}{\mathrm{Lr}}_n\\ {\mathrm{Lg}}_n\\ {\mathrm{Lb}}_n\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}{\mathrm{SPr}}_n\\ {\mathrm{SPg}}_n\\ {\mathrm{SPb}}_n\end{array}\right]---\left(9\right)$

For calculating simplicity, can also first three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values be carried out normalization, be the 3rd normalization with three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values in the present embodiment, for example, will $\left[\begin{array}{c}\mathrm{Lr}1\\ \mathrm{Lg}1\\ \mathrm{Lb}1\end{array}\right]$ With $\left[\begin{array}{c}{\mathrm{SPr}}_1\\ {\mathrm{SPg}}_1\\ {\mathrm{SPb}}_1\end{array}\right]$ The 3rd carry out normalization and obtain $\left[\begin{array}{c}\frac{\mathrm{Lr}1}{\mathrm{Lb}1}\\ \frac{\mathrm{Lg}1}{\mathrm{Lb}1}\\ 1\\ \end{array}\right]$ With $\left[\begin{array}{c}\frac{{\mathrm{SPr}}_1}{{\mathrm{SPb}}_1}\\ \frac{{\mathrm{SPg}}_1}{{\mathrm{SPb}}_1}\\ 1\\ \end{array}\right],$ Being updated to formula (9) after the 3rd normalization with three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values can obtain respectively:

$\left[\begin{array}{c}\frac{{\mathrm{Lr}}_1}{{\mathrm{Lb}}_1}\\ \frac{{\mathrm{Lg}}_1}{{\mathrm{Lb}}_1}\\ 1\\ \end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\frac{{\mathrm{SPr}}_1}{{\mathrm{SPb}}_1}\\ \frac{{\mathrm{SPg}}_1}{{\mathrm{SPb}}_1}\\ 1\\ \end{array}\right]---\left(10\right)$

$\left[\begin{array}{c}\frac{{\mathrm{Lr}}_2}{{\mathrm{Lb}}_2}\\ \frac{{\mathrm{Lg}}_2}{{\mathrm{Lb}}_2}\\ 1\\ \end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\frac{{\mathrm{SPr}}_2}{{\mathrm{SPb}}_2}\\ \frac{{\mathrm{SPg}}_2}{{\mathrm{SPb}}_2}\\ 1\\ \end{array}\right]---\left(11\right)$

$\left[\begin{array}{c}\frac{{\mathrm{Lr}}_3}{{\mathrm{Lb}}_3}\\ \frac{{\mathrm{Lg}}_3}{{\mathrm{Lb}}_3}\\ 1\\ \end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\frac{{\mathrm{SPr}}_3}{{\mathrm{SPb}}_3}\\ \frac{{\mathrm{SPg}}_3}{{\mathrm{SPb}}_3}\\ 1\\ \end{array}\right]---\left(12\right)$

Even vertical formula (10), (11), (12) solve color correction coefficient $\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right].$ Wherein, $\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]$ Be color correction coefficient, x1～x3 is respectively the color correction coefficient of red LED, and y1～y3 is respectively the color correction coefficient of green LED, and z1～z3 is respectively the color correction coefficient of blue led.

On the basis of above-described embodiment, take three-primary color LED array board output white light as example, step 16 is specially:

According to color correction coefficient, adopt following formula:

$\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\mathrm{SPr}\\ \mathrm{SPg}\\ \mathrm{SPb}\end{array}\right]---\left(13\right)$

Generate normal brightness proportioning value.For calculating simplicity, can also first initial theory brightness proportioning value be carried out normalization, in the present embodiment can be with the 3rd normalization of initial theory brightness proportioning value, be specially with $\left[\begin{array}{c}\mathrm{SPr}\\ \mathrm{SPg}\\ \mathrm{SPb}\end{array}\right]$ The 3rd normalization get $\left[\begin{array}{c}\frac{\mathrm{SPr}}{\mathrm{SPb}}\\ \frac{\mathrm{SPg}}{\mathrm{SPb}}\\ 1\\ \end{array}\right],$ Be updated to again in formula (13):

$\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\frac{\mathrm{SPr}}{\mathrm{SPb}}\\ \frac{\mathrm{SPg}}{\mathrm{SPb}}\\ 1\\ \end{array}\right]---\left(14\right)$

For calculating simplicity, to normal brightness proportioning value $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]$ The 3rd normalization obtains $\left[\begin{array}{c}\frac{\mathrm{Pr}}{\mathrm{Pb}}\\ \frac{\mathrm{Pg}}{\mathrm{Pb}}\\ 1\\ \end{array}\right],$ And order

Then according to initial red LED brightness value, initial green LED brightness value and initial blue led brightness value and the predefined target brightness value of three-primary color LED, distinguish the following formula of substitution:

$\mathrm{PWMr}=a*\frac{\mathrm{Lu}\min \mathrm{ancet}\arg \mathrm{et}}{(a+b+1)*\mathrm{Lr}}---\left(15\right)$

$\mathrm{PWMg}=b*\frac{\mathrm{Lu}\min \mathrm{ancet}\arg \mathrm{et}}{(a+b+1)*\mathrm{Lg}}---\left(16\right)$

$\mathrm{PWMb}=\frac{\mathrm{Lu}\min \mathrm{ancet}\arg \mathrm{et}}{(a+b+1)\mathrm{Lb}}---\left(17\right)$

The standard of obtaining red LED, green LED and the blue led of three-primary color LED after proofreading and correct drives signal, thereby realizes the colour correction of three-primary color LED array board;

Wherein, Luminancetarget represents predefined target brightness value;

PWMr, PWMg and PWMb represent that the standard after red LED, green LED and blue led are proofreaied and correct drives signal;

SPr, SPg and SPb are illustrated in and drive signal PWM is the proportioning value of red LED brightness, green LED brightness and the blue led brightness of three-primary color LED in 100% situation;

Pr, Pg and Pb represent the proportioning value of canonical red LED brightness, standard green LED brightness and the brightness of standard blue led.

It should be noted that, in an embodiment of the present invention, for the precision of colour correction can be provided, can also organize predefined drive three-primary color LED array board with 3*n luminous, thereby obtain n color correction coefficient, drive with the generation standard colour correction that signal is realized the three-primary color LED array board.

For example, luminous with six groups of predefined drive three-primary color LED array boards, according to above-mentioned color correcting method, generate respectively two color correction coefficients, be specially $\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]$ With $\left[\begin{array}{ccc}m1& m2& m3\\ n1& n2& n3\\ v1& v2& v3\end{array}\right],$ According to formula (18), the original intensity proportioning value that is generated by three-primary color LED initial chroma value is proofreaied and correct at last:

$\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{ccc}m1& m2& m3\\ n1& n2& n3\\ v1& v2& v3\end{array}\right]\left[\begin{array}{c}\frac{\mathrm{SPr}}{\mathrm{SPb}}\\ \frac{\mathrm{SPg}}{\mathrm{SPb}}\\ 1\\ \end{array}\right]---\left(17\right)$

Thereby the brightness proportioning value of the standard of generation, and then the generation standard drives the colour correction that signal is realized the three-primary color LED array board.

Embodiment two

The structural representation of the colour correcting apparatus that Fig. 2 provides for the embodiment of the present invention two, as shown in Figure 2, colour correcting apparatus 20 comprises that driving signal presets module 21, chromatic value acquisition module 22, theoretical brightness proportioning value generation module 23, intrinsic brilliance proportioning value generation module 24, color correction coefficient generation module 25 and standard driving signal generation module 26.

Wherein, drive signal and preset module 21, be used for luminous with three groups of predefined drive three-primary color LED array boards; Chromatic value acquisition module 22 be used for to gather three groups of chromatic values of the light that the three-primary color LED array board sends respectively under the driving of three groups of predefined driving signals; Theoretical brightness proportioning value generation module 23 is used for utilizing three groups of chromatic values that gather to obtain three groups of theoretical brightness proportioning values of three-primary color LED array board three-primary color LED; Intrinsic brilliance proportioning value generation module 24 is used for according to utilizing three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values; Color correction coefficient generation module 25 is used for obtaining color correction coefficient by three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values; Standard drives signal generation module 26, be used for utilizing color correction coefficient that the original intensity proportioning value that is generated by three-primary color LED initial chroma value is proofreaied and correct, thereby the generation standard drives signal to realize the colour correction of three-primary color LED array board.

Further, standard driving signal generation module 26 specifically comprises: normal brightness proportioning value generation module 261, normalization module 262, red LED standard drive signal generation module 263, the green LED standard drives signal generation module 264 and the blue led standard drives signal generation module 265.

Wherein, normal brightness proportioning value generation module 261 is used for according to described color correction coefficient, and formula $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\mathrm{SPr}\\ \mathrm{SPg}\\ \mathrm{SPb}\end{array}\right],$ Obtain normal brightness proportioning value;

Normalization module 262 is used for normal brightness proportioning value $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]$ The 3rd normalization obtains $\left[\begin{array}{c}\frac{\mathrm{Pr}}{\mathrm{Pb}}\\ \frac{\mathrm{Pg}}{\mathrm{Pb}}\\ 1\\ \end{array}\right],$ And order

The red LED standard drives signal generation module 263, is used for red LED brightness value and predefined target brightness value according to described three-primary color LED, and formula

The standard that obtains proofreading and correct the red LED of rear described three-primary color LED drives signal;

The green LED standard drives signal generation module 264, is used for green LED brightness value and predefined target brightness value according to described three-primary color LED, and formula

The standard that obtains proofreading and correct the green LED of rear described three-primary color LED drives signal;

The blue led standard drives signal generation module 265, is used for blue led brightness value and predefined target brightness value according to described three-primary color LED, and formula

The standard that obtains proofreading and correct the blue led of rear described three-primary color LED drives signal.

in the present embodiment, the workflow of colour correcting apparatus 20 is specially: the driving signal presets module 21, and three groups of predefined drive three-primary color LED array boards are luminous, then gather three groups of chromatic values of the light that the three-primary color LED array boards send respectively under the driving of three groups of predefined driving signals by chromatic value acquisition module 22, and three groups of chromatic values are input in theoretical brightness proportioning value generation module 23, be used for generating three groups of theoretical brightness proportioning values, utilize three groups of intrinsic brilliance proportioning values that three groups of predefined driving signals obtain to be input in color correction coefficient generation module 25 three groups of theoretical brightness proportioning values and intrinsic brilliance proportioning value generation module 24, generate color correction coefficient, the standard that again this color correction coefficient is input to drives the normal brightness proportioning value generation module 261 in signal generation module 26, generate normal brightness proportioning value, then this normal brightness proportioning value is carried out normalization by normalization module 262, red LED original intensity value with normalized value and initial three-primary color LED, green LED original intensity value and blue led original intensity value are updated to respectively the red LED standard and drive signal generation module 263, the green LED standard drives signal generation module 264 and the blue led standard drives in signal generation module 265, drive signal to obtain the standard of proofreading and correct rear three-primary color LED.

In the present embodiment, colour correcting apparatus passes through by three groups of intrinsic brilliance proportioning values and three groups of theoretical brightness proportioning values, generate color correction coefficient, thereby the original intensity proportioning value that is generated by three-primary color LED initial chroma value is proofreaied and correct, drive with the generation standard colour correction that signal is realized the three-primary color LED array board, thereby the three-primary color LED display screen that the LED that makes different brightness, colourity forms or backlight produce uniformly white picture, and then have saved the cost in three-primary color LED display screen and three primary color LED backlight source.

Embodiment three

The structural representation of the LED color calibration system that Fig. 3 provides for the embodiment of the present invention three, the embodiment of the present invention three provides a kind of LED color calibration system that comprises colour correcting apparatus 20, as shown in Figure 3, this LED color calibration system also comprises: three-primary color LED array board 31, harvester 32 and LED control circuit 33, wherein, three-primary color LED array board 31 is used for receiving by LED control circuit 33 the three groups of predefined driving signals or the standard that are sent by colour correcting apparatus 20 and drives signal; Harvester 32 is used for gathering three groups of three groups of chromatic values that predefined drive three-primary color LED array board 31 is luminous.

Concrete, harvester 32 can be specially a cover CCD camera apparatus, and this harvester 32 is connected with colour correcting apparatus 20.

The color calibration system that adopts the embodiment of the present invention three to provide, can pass through harvester, with three groups of intrinsic brilliance proportioning values and three groups of theoretical brightness proportioning values, generate color correction coefficient, thereby the original intensity proportioning value that is generated by three-primary color LED initial chroma value is proofreaied and correct, drive with the generation standard colour correction that signal is realized the three-primary color LED array board, thereby the three-primary color LED display screen that the LED that makes different brightness, colourity forms or backlight produce uniformly white picture, and then have saved the cost in three-primary color LED display screen and three primary color LED backlight source.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be completed by the hardware that programmed instruction is correlated with, aforesaid program can be stored in a computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not be limited, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.

Claims (3)

1. a color correcting method, is characterized in that, comprising:

Luminous with three groups of predefined drive three-primary color LED array boards;

Gather three groups of chromatic values of the light that described three-primary color LED array board sends respectively under the driving of described three groups of predefined driving signals;

Utilize the described three groups of chromatic values that gather to obtain three groups of theoretical brightness proportioning values of three-primary color LED in described three-primary color LED array board;

Utilize described three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values of described three-primary color LED;

Obtain color correction coefficient by described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values;

Utilize described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the generation standard drive signal to realize the colour correction of described three-primary color LED array board;

wherein, the step that described three groups of chromatic values of described utilization collection obtain three groups of theoretical brightness proportioning values of three-primary color LED in described three-primary color LED array board is specially: according to the initial red LED chromatic value of three-primary color LED, initial green LED chromatic value and initial blue led chromatic value, obtain three groups of theoretical brightness proportioning values of three-primary color LED in the three-primary color LED array board, the red LED chromatic value that collects is expressed as (xr, yr), the green LED chromatic value is expressed as (xg, yg), the blue led chromatic value is expressed as (xb, yb), three groups of theoretical brightness proportioning values that obtain are respectively:

$\left[\begin{array}{c}{\mathrm{SPr}}_1\\ {\mathrm{SPg}}_1\\ {\mathrm{SPb}}_1\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}1}{\mathrm{yw}1}\\ 1\\ \frac{1-\mathrm{xw}1-\mathrm{yw}1}{\mathrm{yw}1}\end{array}\right]$

$\left[\begin{array}{c}{\mathrm{SPr}}_2\\ {\mathrm{SPg}}_2\\ {\mathrm{SPb}}_2\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}2}{\mathrm{yw}2}\\ 1\\ \frac{1-\mathrm{xw}2-\mathrm{yw}2}{\mathrm{yw}2}\end{array}\right]$

$\left[\begin{array}{c}{\mathrm{SPr}}_3\\ {\mathrm{SPg}}_3\\ {\mathrm{SPb}}_3\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}3}{\mathrm{yw}3}\\ 1\\ \frac{1-\mathrm{xw}3-\mathrm{yw}3}{\mathrm{yw}3}\end{array}\right]$

Wherein, three groups of white light colourity value representations of each three-primary color LED array board that collects are (xw1, yw1), (xw2, yw2), (xw3, yw3);

SPr ₁, SPg ₁And SPb ₁Be respectively the proportioning value of first group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

SPr ₂, SPg ₂And SPb ₂Be respectively the proportioning value of second group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

SPr ₃, SPg ₃And SPb ₃Be respectively the proportioning value of the 3rd group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

Utilize described three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values of described three-primary color LED, comprising:

Utilize described three groups of predefined driving signals, and formula $\left[\begin{array}{c}{\mathrm{Lr}}_n\\ {\mathrm{Lg}}_n\\ {\mathrm{Lb}}_n\end{array}\right]=\left[\begin{array}{c}{\mathrm{PWMr}}_n*\mathrm{Lr}\\ {\mathrm{PWMg}}_n*\mathrm{Lb}\\ {\mathrm{PWMb}}_n*\mathrm{Lg}\end{array}\right],$ Obtain three groups of intrinsic brilliance proportioning values;

Wherein, Lr _n, Lg _nAnd Lb _nThe proportioning value, the proportioning value of actual green LED brightness and the proportioning value of actual blue LED brightness that represent the actual red LED brightness of n group;

PWMr _n, PWMg _nAnd PWMb _nThe driving signal that represents n group predefined red LED, green LED and blue led;

Lr, Lb and Lg represent initial red LED brightness value, initial blue led brightness value and initial green LED brightness value;

N is 1,2,3;

By described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values, and formula $\left[\begin{array}{c}{\mathrm{Lr}}_n\\ {\mathrm{Lg}}_n\\ {\mathrm{Lb}}_n\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}{\mathrm{SPr}}_n\\ {\mathrm{SPg}}_n\\ {\mathrm{SPb}}_n\end{array}\right],$ Obtain color correction coefficient;

Wherein, $\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]$ Be color correction coefficient, x1～x3 is respectively the color correction coefficient of red LED, and y1～y3 is respectively the color correction coefficient of green LED, and z1～z3 is respectively the color correction coefficient of blue led;

SPr _n, SPg _nAnd SPb _nThe proportioning value that represents n group theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

Utilize described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the generation standard drives signal to realize the colour correction of described three-primary color LED array board, comprising:

According to described color correction coefficient, and formula $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\mathrm{SPr}\\ \mathrm{SPg}\\ \mathrm{SPb}\end{array}\right],$ Obtain normal brightness proportioning value;

To normal brightness proportioning value $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]$ The 3rd normalization obtains $\left[\begin{array}{c}\frac{\mathrm{Pr}}{\mathrm{Pb}}\\ \frac{\mathrm{Pg}}{\mathrm{Pb}}\\ 1\\ \end{array}\right],$ And order

According to initial red LED brightness value L r and the predefined target brightness value of described three-primary color LED, and formula

The standard that obtains proofreading and correct the red LED of rear described three-primary color LED drives signal;

According to initial green LED brightness value L g and the predefined target brightness value of described three-primary color LED, and formula

The standard that obtains proofreading and correct the green LED of rear described three-primary color LED drives signal;

According to initial blue led brightness value L b and the predefined target brightness value of described three-primary color LED, and formula

The standard that obtains proofreading and correct the blue led of rear described three-primary color LED drives signal;

Wherein, Luminancetarget represents predefined target brightness value;

PWMr, PWMg and PWMb represent that the standard after red LED, green LED and blue led are proofreaied and correct drives signal;

SPr, SPg and SPb are illustrated in and drive signal PWM is the proportioning value of red LED brightness, green LED brightness and the blue led brightness of three-primary color LED in 100% situation;

Pr, Pg and Pb represent the proportioning value of canonical red LED brightness, standard green LED brightness and the brightness of standard blue led.

2. a colour correcting apparatus, is characterized in that, comprising:

Drive signal and preset module, be used for luminous with three groups of predefined drive three-primary color LED array boards;

The chromatic value acquisition module is used for gathering three groups of chromatic values of the light that described three-primary color LED array board sends respectively under the driving of described three groups of predefined driving signals;

Theoretical brightness proportioning value generation module is used for utilizing the described three groups of chromatic values that gather to obtain three groups of theoretical brightness proportioning values of described three-primary color LED array board three-primary color LED;

Intrinsic brilliance proportioning value generation module is used for utilizing described three groups of predefined driving signals to obtain three groups of intrinsic brilliance proportioning values of described three-primary color LED;

The color correction coefficient generation module is used for obtaining color correction coefficient by described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values;

Standard drives the signal generation module, be used for utilizing described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the generation standard drives signal to realize the colour correction of described three-primary color LED array board;

Wherein, described chromatic value acquisition module specifically is used for: according to initial red LED chromatic value, initial green LED chromatic value and the initial blue led chromatic value of three-primary color LED, obtain three groups of theoretical brightness proportioning values of three-primary color LED in the three-primary color LED array board, the red LED chromatic value that collects is expressed as (xr, yr), and the green LED chromatic value is expressed as (xg, yg), the blue led chromatic value is expressed as (xb, yb), and three groups of theoretical brightness proportioning values that obtain are respectively:

$\left[\begin{array}{c}{\mathrm{SPr}}_1\\ {\mathrm{SPg}}_1\\ {\mathrm{SPb}}_1\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}1}{\mathrm{yw}1}\\ 1\\ \frac{1-\mathrm{xw}1-\mathrm{yw}1}{\mathrm{yw}1}\end{array}\right]$

$\left[\begin{array}{c}{\mathrm{SPr}}_2\\ {\mathrm{SPg}}_2\\ {\mathrm{SPb}}_2\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}2}{\mathrm{yw}2}\\ 1\\ \frac{1-\mathrm{xw}2-\mathrm{yw}2}{\mathrm{yw}2}\end{array}\right]$

$\left[\begin{array}{c}{\mathrm{SPr}}_3\\ {\mathrm{SPg}}_3\\ {\mathrm{SPb}}_3\end{array}\right]={\left[\begin{array}{ccc}\frac{\mathrm{xr}}{\mathrm{yr}}& \frac{\mathrm{xg}}{\mathrm{yg}}& \frac{\mathrm{xb}}{\mathrm{yb}}\\ 1& 1& 1\\ \frac{1-\mathrm{xr}-\mathrm{yr}}{\mathrm{yr}}& \frac{1-\mathrm{xg}-\mathrm{yg}}{\mathrm{yg}}& \frac{1-\mathrm{xb}-\mathrm{yb}}{\mathrm{yb}}\end{array}\right]}^{-1}\left[\begin{array}{c}\frac{\mathrm{xw}3}{\mathrm{yw}3}\\ 1\\ \frac{1-\mathrm{xw}3-\mathrm{yw}3}{\mathrm{yw}3}\end{array}\right]$

Wherein, three groups of white light colourity value representations of each three-primary color LED array board that collects are (xw1, yw1), (xw2, yw2), (xw3, yw3);

SPr ₁, SPg ₁And SPb ₁Be respectively the proportioning value of first group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

SPr ₂, SPg ₂And SPb ₂Be respectively the proportioning value of second group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

SPr ₃, SPg ₃And SPb ₃Be respectively the proportioning value of the 3rd group of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

Described intrinsic brilliance proportioning value generation module specifically is used for:

Utilize described three groups of predefined driving signals, and formula $\left[\begin{array}{c}{\mathrm{Lr}}_n\\ {\mathrm{Lg}}_n\\ {\mathrm{Lb}}_n\end{array}\right]=\left[\begin{array}{c}{\mathrm{PWMr}}_n*\mathrm{Lr}\\ {\mathrm{PWMg}}_n*\mathrm{Lb}\\ {\mathrm{PWMb}}_n*\mathrm{Lg}\end{array}\right],$ Obtain three groups of intrinsic brilliance proportioning values;

Wherein, Lr _n, Lg _nAnd Lb _nThe proportioning value, the proportioning value of actual green LED brightness and the proportioning value of actual blue LED brightness that represent the actual red LED brightness of n group;

PWMr _n, PWMg _nAnd PWMb _nThe driving signal that represents n group predefined red LED, green LED and blue led;

Lr, Lb and Lg represent initial red LED brightness value, initial blue led brightness value and initial green LED brightness value;

N is 1,2,3;

Described color correction coefficient generation module specifically is used for:

By described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values, and formula $\left[\begin{array}{c}{\mathrm{Lr}}_n\\ {\mathrm{Lg}}_n\\ {\mathrm{Lb}}_n\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}{\mathrm{SPr}}_n\\ {\mathrm{SPg}}_n\\ {\mathrm{SPb}}_n\end{array}\right],$ Obtain color correction coefficient;

Wherein, $\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]$ Be color correction coefficient, x1～x3 is respectively the color correction coefficient of red LED, and y1～y3 is respectively the color correction coefficient of green LED, and z1～z3 is respectively the color correction coefficient of blue led;

SPr _n, SPg _nAnd SPb _nThe proportioning value that represents n group theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

Described standard drives the signal generation module and specifically comprises:

Normal brightness proportioning value generation module is used for according to described color correction coefficient, and formula $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]=\left[\begin{array}{ccc}x1& x2& x3\\ y1& y2& y3\\ z1& z2& z3\end{array}\right]\left[\begin{array}{c}\mathrm{SPr}\\ \mathrm{SPg}\\ \mathrm{SPb}\end{array}\right],$ Obtain normal brightness proportioning value;

The normalization module is used for normal brightness proportioning value $\left[\begin{array}{c}\mathrm{Pr}\\ \mathrm{Pg}\\ \mathrm{Pb}\end{array}\right]$ The 3rd normalization obtains $\left[\begin{array}{c}\frac{\mathrm{Pr}}{\mathrm{Pb}}\\ \frac{\mathrm{Pg}}{\mathrm{Pb}}\\ 1\\ \end{array}\right],$ And order $\frac{\mathrm{Pr}}{\mathrm{Pb}}=a,$ $\frac{\mathrm{Pg}}{\mathrm{Pb}}=b;$

The red LED standard drives the signal generation module, is used for initial red LED brightness value L r and predefined target brightness value according to described three-primary color LED, and formula

The standard that obtains proofreading and correct the red LED of rear described three-primary color LED drives signal;

The green LED standard drives the signal generation module, is used for initial green LED brightness value L g and predefined target brightness value according to described three-primary color LED, and formula

The standard that obtains proofreading and correct the green LED of rear described three-primary color LED drives signal;

The blue led standard drives the signal generation module, is used for root according to initial blue led brightness value L b and the predefined target brightness value of described three-primary color LED, and formula

The standard that obtains proofreading and correct the blue led of rear described three-primary color LED drives signal;

Wherein, Luminancetarget represents predefined target brightness value;

PWMr, PWMg and PWMb represent that the standard after red LED, green LED and blue led are proofreaied and correct drives signal;

SPr, SPg and SPb are illustrated in and drive signal PWM is the proportioning value of red LED brightness, green LED brightness and the blue led brightness of three-primary color LED in 100% situation;

Pr, Pg and Pb represent the proportioning value of canonical red LED brightness, standard green LED brightness and the brightness of standard blue led.

3. a LED color calibration system that comprises colour correcting apparatus claimed in claim 2, is characterized in that, also comprises described three-primary color LED array board, harvester and LED control circuit, wherein,

Described three-primary color LED array board is used for receiving by described LED control circuit the described three groups of predefined driving signals or the described standard that are sent by described colour correcting apparatus and drives signal;

Described harvester is used for gathering the luminous described three groups of chromatic values of the described three-primary color LED array board of described three groups of predefined drive.

Images