CN102074206A - 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 to be used for the display screen of 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 reduce greatly, has also improved the contrast, color representation of LCD TV etc.Simultaneously, because the LED-backlit source is very long serviceable life, 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, in high-end product, also can further improve color representation power in employing multicolor LED-backlit source, for example, Mitsubishi Electric has issued the LCD of using six primary colors LED-backlit sources on SID2005.

In the prior art, can satisfy the demand of colourity and brightness for the light that LED is sent, 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 under 100% the situation, and the chromatic value of color according to demand and brightness value, by conversion formula, obtain the drive signal PWM of each three-primary color LED.Send required color with the corresponding with it three-primary color LED of the drive signal PWM driving of each three-primary color LED that obtains then.

To require three-primary color LED array board output white light is example.At the drive signal PWM of input is under 100% the situation, 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 the chromatic value and the brightness value of brightness value and each blue led, according to the 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 drive signal PWM, then this drive signal PWM is input in the corresponding with it three-primary color LED, thereby make three-primary color LED array board output white light according to each brightness proportioning value.

But there is error in the drive signal PWM that obtains standard in drive signal PWM and the reality, thereby makes and problems such as color spot and speck occur on the whole screen.With above-mentioned three-primary color LED array board output white light is 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

But the normal brightness proportioning value of actual this three-primary color LED should for

So, according to calculating the brightness proportioning value that obtains The drive signal PWM that is generated 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, there is error owing to calculate the drive signal PWM of each three-primary color LED that obtains and the standard drive signal of actual each three-primary color LED, thereby makes the problem that occurs color spot and speck on the 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, to proofread and correct because three-primary color LED shows unevenness such as color spot that difference brings, speck, 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 drive signals;

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

Utilize described three groups of predefined drive 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 standard of generation drive signal is 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 preestablishes module, is used for three groups of predefined drive three-primary color LED array boards luminous;

The chromatic value acquisition module is used to 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 drive signals;

Theoretical brightness proportioning value generation module is used for utilizing described three groups of chromatic values of collection 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 to utilize described three groups of predefined drive 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 drive signal generation module is used to utilize described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the standard of generation drive signal is 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 described three groups of predefined drive signals or the described standard drive signal that is sent by described colour correcting apparatus by described LED control circuit;

Described harvester is used to gather 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, to generate the colour correction that the standard drive signal realizes the three-primary color LED array board, thereby 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 of three-primary color LED display screen and three-primary color LED backlight.

Description of drawings

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

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

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

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

Embodiment

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

Three groups of chromatic values that step 13, utilization are gathered 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 drive 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 standard of generation drive signal is to realize the colour correction of three-primary color LED array board.

In step 12, respectively each three-primary color LED on the three-primary color LED array board is imported three groups of predefined drive signals, and gather each three-primary color LED respectively at three groups of chromatic values importing the light that sends under three groups of predefined drive signals, with three-primary color LED array board output white light is example, then under three groups of predefined drive signals of input, the chromatic value of each the three-primary color LED array board that is collected 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, with above-mentioned three-primary color LED array board output white light is example, be that the red LED chromatic value that collects under 100% the situation is expressed as (xr at drive signal PWM, yr), the green LED chromatic value be expressed as (xg, yt), the blue led chromatic value is expressed as (xb, yb), then adopt formula (1) can obtain three groups of theoretical brightness proportioning values respectively, 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, to generate the colour correction that the standard drive signal realizes the three-primary color LED array board, thereby 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 of three-primary color LED display screen and three-primary color LED backlight.

On the basis of the foregoing description, be example with three-primary color LED array board output white light, step 14 is specially:

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

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

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

PWMr _n, PWMg _nAnd PWMb _nThe drive signal of representing the 2nd group of predefined red LED, green LED and blue led;

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

Concrete, can obtain three groups of intrinsic brilliance proportioning values respectively 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 the foregoing description, be example with three-primary color LED array board output white light, 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:

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

Easy in order to calculate, can also earlier three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values be carried out normalization, be the 3rd normalization in the present embodiment with three groups of theoretical brightness proportioning values and three groups of intrinsic brilliance proportioning values, for example, will

With The 3rd carry out normalization and obtain

With

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 upright 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,

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 the foregoing description, be example with three-primary color LED array board output white light, 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.Easy in order to calculate, can also earlier 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 The 3rd normalization get

Be updated to again in the formula (13):

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

Easy in order to calculate, to normal brightness proportioning value The 3rd normalization obtains

Open order

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

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

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

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

Obtain the standard drive signal of red LED, green LED and the blue led of proofreading and correct the back three-primary color LED, thereby realize the colour correction of three-primary color LED array board;

Wherein, Luminancetarget represents predefined target brightness value;

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

SPr, SPg and SPb are illustrated in the proportioning value of red LED brightness, green LED brightness and blue led brightness that drive signal PWM is a three-primary color LED under 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, it is luminous to organize predefined drive three-primary color LED array board with 3*n, thereby obtain n color correction coefficient, to generate the colour correction that the standard drive signal realizes 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 two color correction coefficients respectively, be specially Know 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 standard of generation drive signal realizes the colour correction of 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 invention two, as shown in Figure 2, colour correcting apparatus 20 comprises that drive signal preestablishes 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 drive signal generation module 26.

Wherein, drive signal preestablishes module 21, is used for three groups of predefined drive three-primary color LED array boards luminous; Chromatic value acquisition module 22 is used 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 drive signals; Theoretical brightness proportioning value generation module 23 is used for utilizing three groups of chromatic values of collection 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 drive 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 drive signal generation module 26 be used to utilize 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 standard of generation drive signal is to realize the colour correction of three-primary color LED array board.

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

Wherein, normal brightness proportioning value generation module 261 is used for according to described color correction coefficient, and formula

Obtain normal brightness proportioning value;

Normalization module 262 is used for normal brightness proportioning value

The 3rd normalization obtains

And order $\frac{\mathrm{Pr}}{\mathrm{Pb}}=a,$ $\frac{\mathrm{Pg}}{\mathrm{Pb}}=b;$

Red LED standard drive 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 drive signal of the red LED of described three-primary color LED after obtaining proofreading and correct;

Green LED standard drive 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 drive signal of the green LED of described three-primary color LED after obtaining proofreading and correct;

Blue led standard drive 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 drive signal of the blue led of described three-primary color LED after obtaining proofreading and correct.

In the present embodiment, the workflow of colour correcting apparatus 20 is specially: it is luminous with three groups of predefined drive three-primary color LED array boards that drive signal preestablishes module 21, gather three groups of chromatic values of the light that the three-primary color LED array boards send respectively then under the driving of three groups of predefined drive signals by chromatic value acquisition module 22, and three groups of chromatic values are input in the theoretical brightness proportioning value generation module 23, be used to generate three groups of theoretical brightness proportioning values, three groups of intrinsic brilliance proportioning values utilizing three groups of predefined drive signals to obtain three groups of theoretical brightness proportioning values and intrinsic brilliance proportioning value generation module 24 are input in the color correction coefficient generation module 25, generate color correction coefficient, again this color correction coefficient is input to the normal brightness proportioning value generation module 261 in the standard drive 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 red LED standard drive signal generation module 263 respectively, in green LED standard drive signal generation module 264 and the blue led standard drive signal generation module 265, to obtain the standard drive signal of proofreading and correct the back 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, to generate the colour correction that the standard drive signal realizes the three-primary color LED array board, thereby 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 of three-primary color LED display screen and three-primary color LED backlight.

Embodiment three

The structural representation of the LED color calibration system that Fig. 3 provides for the embodiment of the invention three, the embodiment of the 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 three groups of predefined drive signals or the standard drive signal that is sent by colour correcting apparatus 20 by LED control circuit 33; Harvester 32 is used to gather three groups of luminous chromatic values of three groups of predefined drive three-primary color LED array boards 31.

Concrete, harvester 32 can be specially a cover CCD camera apparatus, and this harvester 32 links to each other with colour correcting apparatus 20.

The color calibration system that adopts the embodiment of the 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, to generate the colour correction that the standard drive signal realizes the three-primary color LED array board, thereby 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 of three-primary color LED display screen and three-primary color LED backlight.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the 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: 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 limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment 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 (7)

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 drive signals;

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

Utilize described three groups of predefined drive 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 standard of generation drive signal is to realize the colour correction of described three-primary color LED array board.

2. color correcting method according to claim 1 is characterized in that, utilizes described three groups of predefined drive signals to obtain three groups of intrinsic brilliance proportioning values of described three-primary color LED, comprising:

Utilize described three groups of predefined drive signals, and formula

Obtain three groups of intrinsic brilliance proportioning values;

Wherein, Lr _n, Lg _nAnd Lb _nRepresent that n organizes actual red LED brightness value, actual green LED brightness value and actual blue LED brightness value;

PWMr _n, PWMg _nAnd PWM _bRepresent that n organizes the drive signal of predefined red LED, green LED and blue led;

Lr, lb and Lg are illustrated in red LED brightness value, green LED brightness value and the blue led brightness value that drive signal PWM is a three-primary color LED under 100% situation;

N is 1,2,3.

3. color correcting method according to claim 1 is characterized in that, obtains color correction coefficient by described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values, comprising:

By described three groups of theoretical brightness proportioning values and described three groups of intrinsic brilliance proportioning values, and formula

Obtain color correction coefficient;

Wherein,

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 _nRepresent that n organizes the proportioning value of theoretical red LED brightness, theoretical green LED brightness and theoretical blue led brightness;

N is 1,2,3.

4. color correcting method according to claim 1, it is characterized in that, utilize described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the standard of generation drive signal comprises to realize the colour correction of described three-primary color LED array board:

According to described color correction coefficient, and formula

Obtain normal brightness proportioning value;

To normal brightness proportioning value

The 3rd normalization obtains

And order

According to the initial red LED brightness value and the predefined target brightness value of described three-primary color LED, and formula The standard drive signal of the red LED of described three-primary color LED after obtaining proofreading and correct;

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

The standard drive signal of the green LED of described three-primary color LED after obtaining proofreading and correct;

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

The standard drive signal of the blue led of described three-primary color LED after obtaining proofreading and correct;

Wherein, Luminancetarget represents predefined target brightness value;

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

SPr, SPg and SPb are illustrated in the proportioning value of red LED brightness, green LED brightness and blue led brightness that drive signal PWM is a three-primary color LED under 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.

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

Drive signal preestablishes module, is used for three groups of predefined drive three-primary color LED array boards luminous;

The chromatic value acquisition module is used to 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 drive signals;

Theoretical brightness proportioning value generation module is used for utilizing described three groups of chromatic values of collection 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 to utilize described three groups of predefined drive 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 drive signal generation module is used to utilize described color correction coefficient that the brightness proportioning value of described three-primary color LED is proofreaied and correct, thereby the standard of generation drive signal is to realize the colour correction of described three-primary color LED array board.

6. colour correcting apparatus according to claim 5 is characterized in that, described standard drive signal generation module specifically comprises:

Normal brightness proportioning value generation module is used for according to described color correction coefficient, and formula

Obtain normal brightness proportioning value;

The normalization module is used for normal brightness proportioning value

The 3rd normalization obtains

And order

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

The standard drive signal of the red LED of described three-primary color LED after obtaining proofreading and correct;

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

The standard drive signal of the green LED of described three-primary color LED after obtaining proofreading and correct;

Blue led standard drive signal generation module is used for blue led brightness value and the predefined target brightness value of root according to described three-primary color LED, and formula

The standard drive signal of the blue led of described three-primary color LED after obtaining proofreading and correct;

Wherein, Luminancetarget represents predefined target brightness value;

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

SPr, SPg and SPb are illustrated in the proportioning value of red LED brightness, green LED brightness and blue led brightness that drive signal PWM is a three-primary color LED under 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.

7. a LED color calibration system that comprises the arbitrary described colour correcting apparatus of claim 5～6 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 described three groups of predefined drive signals or the described standard drive signal that is sent by described colour correcting apparatus by described LED control circuit;

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

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