CN101155320B - Method and system for automatically measuring and adjusting gray scale white balance of display - Google Patents

Abstract

The invention is a method for automatically measuring and adjusting gray scale white balance of a display, the method measures the white chromaticity coordinates and brightness presented by the display by an instrument, selects the chromaticity coordinates of the three primary colors of red, green and blue in the known chromaticity space, and calculates the mixing proportion required when the three primary colors of red, green and blue are mixed into the white presented by the display according to the Grassman's Low of Color Mixture of colorimetry; meanwhile, calculating the mixing proportion required by the ideal white color at a certain target color temperature mixed by the three primary colors of red, green and blue; the two mixing ratios are compared, and the ratio of the two mixing ratios is used as a group of gain values of the three primary colors of red, green and blue of the display so as to effectively solve the problem of time and labor waste caused by the traditional manual adjustment and calibration of gray scale white balance and avoid human errors caused by manual adjustment and calibration.

Description

The gray level white balance method and system of automatic measurement and adjustment display

Technical field

The adjusting process of the gray level white balance of the relevant display of thing of the present invention; especially refer to a kind of can the measurement automatically and the gray level white balance method of adjustment display; phase makes display can present best color representation, and effectively solves the waste in man-hour that conventional manual adjustment gray level white balance caused and the problem of human error.

Background technology

At display (as: plasma scope (Plasma Display Panel, be called for short PDP) and LCD (Liquid Crystal Display, abbreviation LCD) etc. in the production process), it is red, green, the homogeneity of the luminous ratio of primary colors generally all is difficult to reach, each display when causing the dealer to guarantee to dispatch from the factory all can be reached best color representation, even same label, display with a collection of production and same process is as the same, therefore, the dealer is after the display assembling is finished, generally all can be before shipment, gray level white balance at each display is adjusted, the present practice is colour temperature and the colo(u)r bias when measuring display one by one and present white with instrument, again with manual mode, it is red to adjust it, green, the yield value of primary colors (Gain), till the white that display presented approaches target colour temperature and colo(u)r bias,, and can present best color representation so that the display of being produced all has correct gray level white balance parameter.Yet; the practice of this manual adjustment gray level white balance parameter; not only expend time in and manpower; human error in the manual adjustment process; also can't usually cause between the gray level white balance parameter of display and desirable gray level white balance parameter to have a sizable gap with avoiding, cause shipment instability quality problem.

In addition, traditionally, the dealer saves time and the cost of manpower, and the adjustment speed of quickening gray level white balance parameter, generally all can be earlier at one in the display of each batch shipment adjustment operation of carrying out the gray level white balance parameter, and it is red with what obtained, green, the yield value of primary colors, as in order to the foundation of adjustment with the yield value of other display of a collection of shipment, in brief, yield value with the display of a collection of shipment all is configured to a fixed value, this kind adjustment mode, though saved a large amount of time and human cost, and accelerated the adjustment speed of the gray level white balance of display, yet,, and sacrificed the color representation of display but because of can't taking into account the chromatic characteristic difference that exists between different displays, only cause a display to reach best color representation, other display then can't reach the phenomenon of optimum color performance.

Summary of the invention

In view of this, the adjustment technology of tradition gray level white balance can't be under the prerequisite that meets most economic benefit, guarantee that each display all can reach best color representation when shipment, the inventor is through the permanent research and experiment of making great efforts, and development and Design goes out the method for the gray level white balance of a kind of automatic measurement of the present invention and adjustment display finally.

A purpose of the present invention, be according in the Grassman of colorimetry (Colormetry) the color matching law (Grassman ' s Low of Color Mixture), coloured light all can be red arbitrarily, green, the redeployed idea of primary colors, go out white chromaticity coordinate (chromaticity coordinates) and the brightness that a display is presented by an apparatus measures, and choose in the known chrominance space red, green, the chromaticity coordinate of primary colors, Grassman color matching law according to colorimetry calculates automatically by described red, green, required mixed proportion when primary colors are mixed into presented on this display white; Simultaneously, calculate mixed proportion required when being mixed into ideal white under a certain target colour temperature by described Red Green Blue; Again this two mixed proportion is compared, and, according to this this display is carried out adjustment, make it can present best color representation with therebetween ratio one group of yield value as the Red Green Blue of this display.

Another object of the present invention; be to cooperate circuit and programming; automatically will organize in the memory that yield value writes this display; carry out adjustment with gray level white balance to this display; make it can present best color representation; the time of being caused with effective solution conventional manual adjustment gray level white balance and the waste problem of manpower, and avoid the human error that caused because of manual adjustment.

Description of drawings

Fig. 1 is the circuit box schematic diagram of first embodiment of the invention;

Fig. 2 is that first embodiment shown in Figure 1 carries out adjusted experimental data schematic diagram to display;

Fig. 3 is the circuit box schematic diagram of second embodiment of the invention; And

Fig. 4 is the circuit box schematic diagram of third embodiment of the invention.

Symbol description:

Instrument ... 10,20,30 panels ... 11,21,31

System circuit board ... 12,22,32 memories ... 1231,2231,311

Video signal decoder ... 121,221,321 release of an interleave scanners ... 122,222,322

Scale controller ... 123,223,323 arithmetic elements ... 13,23,33

Embodiment

For making purpose of the present invention, shape, constructing apparatus feature and effect thereof, be convenient to further be familiar with and understand, cooperate graphicly now for embodiment, be described in detail as follows:

The present invention is according in the Grassman of the colorimetry color matching law, coloured light all can be red arbitrarily, green, the redeployed idea of primary colors, earlier go out white chromaticity coordinate and the brightness that a display presents by an apparatus measures, and choose in the known chrominance space red, green, the chromaticity coordinate of primary colors, as: choose the red of EBU vision signal standard, green, the chromaticity coordinate R (0.64 of primary colors, 0.33), G (0.29,0.6) and B (0.15,0.06), utilize Grassman color matching law again, calculate automatically by described red, green, required mixed proportion when primary colors are mixed into presented on this display white; Simultaneously, calculate mixed proportion required when being mixed into ideal white under certain target colour temperature by described Red Green Blue; Again this two mixed proportion is compared,, and, according to this display is proofreaied and correct, so that it presents best color representation with one group of yield value of this ratio as the Red Green Blue of this display in the hope of ratio therebetween.

According to (the Commission Internation De ' l E ' clairage of international lighting association, abbreviation CIE) the colour system conversion formula of being formulated, chromaticity coordinate and brightness (x, y, Y) can according to following formula (1) convert to theoretical three primary colors (X, Y, Z), wherein X, Y and Z are meant the values of Red Green Blue, and promptly it is to the stimulation energy of human eye:

$(X,Y,Z)=(\frac{x\·Y}{y},Y,\frac{(1-x-y)\·Y}{y})\·\·\·\left(1\right)$

Therefore, be W if the present invention sees through this apparatus measures to white chromaticity coordinate and the brightness that this display presented _p(x _Wp, y _Wp, Y _Wp) time, its theoretical three primary colors will be shown in following formula (2):

$W_p(X_{\mathrm{wp}},Y_{\mathrm{wp}},Z_{\mathrm{wp}})=(\frac{x_{\mathrm{wp}}\·Y_{\mathrm{wp}}}{y_{\mathrm{wp}}},Y_{\mathrm{wp}},\frac{(1-x_{\mathrm{wp}}-y_{\mathrm{wp}})\·Y_{\mathrm{wp}}}{y_{\mathrm{wp}}})\·\·\·\left(2\right)$

At this moment, the Red Green Blue of supposing this display is respectively R _p(x _r, y _r), G _p(x _g, y _g), B _p(x _b, y _b), according to the idea of Grassman color matching law, because all can being allocated according to suitable brightness ratio by Red Green Blue, any color form, so the white chromaticity coordinate of this display and brightness W _p(x _Wp, y _Wp, Y _Wp) theoretical three primary colors W _p(X _Wp, Y _Wp, Z _Wp), can comply with following formula (3), by red color coordinate R _p(x _r, y _r) and brightness Y _RpTheoretical three primary colors R _p(X _r, Y _Rp, Z _r), green chromaticity coordinate G _p(x _g, y _g) and brightness Y _GpTheoretical three primary colors G _p(X _g, Y _Gp, Z _g), chroma blue coordinate B _p(x _b, y _b) and brightness Y _BpTheoretical three primary colors B _p(X _b, Y _Bp, Z _b) combine:

W _p(X _wp，Y _wp，Z _wp)＝R _p(X _r，Y _rp，Z _r)+G _p(X _g，Y _gp，Z _g)+B _p(X _b，Y _bp，Z _b)…(3)

According to CIE colour system system conversion table, red color coordinate R _p(x _r, y _r) and brightness Y _RpTheoretical three primary colors R _p(X _r, Y _Rp, Z _r) can represent by following formula (4):

$R_p(X_r,Y_{\mathrm{rp}},Z_r)=(\frac{x_r\·Y_{\mathrm{rp}}}{y_r},Y_{\mathrm{rp}},\frac{(1-x_r-y_r)\·Y_{\mathrm{rp}}}{y_r})\·\·\·\left(4\right)$

In like manner, green chromaticity coordinate G _p(x _g, y _g) and brightness Y _GpTheoretical three primary colors G _p(X _g, Y _Gp, Z _g), chroma blue coordinate B _p(x _b, y _b) and brightness Y _BpTheoretical three primary colors B _p(X _b, Y _Bp, Z _b) can be expressed as follows with formula (5) and (6) respectively:

$G_p(X_g,Y_{\mathrm{gp}},Z_g)=(\frac{x_g\·Y_{\mathrm{gp}}}{y_g},Y_{\mathrm{gp}},\frac{(1-x_g-y_g)\·Y_{\mathrm{gp}}}{y_g})\·\·\·\left(5\right)$

$B_p(X_b,Y_{\mathrm{bp}},Z_b)=(\frac{x_b\·Y_{\mathrm{bp}}}{y_b},Y_{\mathrm{bp}},\frac{(1-x_b-y_b)\·Y_{\mathrm{bp}}}{y_b})\·\·\·\left(6\right)$

By aforementioned formula (3), (4), (5) and (6) as can be known, this display under certain colour temperature, its theoretical trichromatic value (X _Wp, Y _Wp, Z _Wp) will reach shown in (9) as following formula (7), (8) respectively:

$X_{\mathrm{wp}}=\frac{x_r\·Y_{\mathrm{rp}}}{y_r}+\frac{x_g\·Y_{\mathrm{gp}}}{y_g}+\frac{x_b\·Y_{\mathrm{bp}}}{y_b}\·\·\·\left(7\right)$

Y _wp＝Y _rp+Y _gp+Y _bp………………………………………………………(8)

$Z_{\mathrm{wp}}=\frac{(1-x_r-y_r)\·Y_{\mathrm{rp}}}{y_r}+\frac{(1-x_g-y_g)\·Y_{\mathrm{gp}}}{y_g}+\frac{(1-x_b-y_b)\·Y_{\mathrm{bp}}}{y_b}\·\·\·\left(9\right)$

Formula (7), (8) and (9) are separated simultaneous equations, can try to achieve white color system that this display presents red brightness Y by how many ratios _Rp, green brightness Y _Gp, blue brightness Y _BpCombine Deng institute.

In like manner, suppose that the chromaticity coordinate of ideal white under a certain target colour temperature and brightness are W _i(x _Wi, y _Wi, Y _Wi), according to following formula (10), can be by red color coordinate R _p(x _r, y _r) and brightness Y _RiTheoretical three primary colors R _p(X _r, Y _Ri, Z _r), green chromaticity coordinate G _p(x _g, y _g) and brightness Y _GiTheoretical three primary colors G _p(X _g, Y _Gi, Z _g), chroma blue coordinate B _p(x _b, y _b) and brightness Y _BiTheoretical three primary colors B _p(X _b, Y _Bi, Z _b) combine:

W _i(X _wi，Y _wi，Z _wi)＝R _p(X _r，Y _ri，Z _r)+G _p(X _g，Y _gi，Z _g)+B _p(X _b，Y _bi，Z _b)……(10)

Again according to CIE colour system system conversion table, red color coordinate R _p(x _r, y _r) and brightness Y _RiTheoretical three primary colors R _p(X _r, Y _Ri, Z _r) can represent by following formula (11):

$R_p(X_r,Y_{\mathrm{ri}},Z_r)=(\frac{x_r\·Y_{\mathrm{ri}}}{y_r},Y_{\mathrm{ri}},\frac{(1-x_r-y_r)\·Y_{\mathrm{ri}}}{y_r})\·\·\·\left(11\right)$

In like manner, green chromaticity coordinate G _p(x _g, y _g) and brightness Y _GiTheoretical three primary colors G _p(X _g, Y _Gi, Z _g), chroma blue coordinate B _p(x _b, y _b) and brightness Y _BiTheoretical three primary colors B _p(X _b, Y _Bi, Z _b) can represent with following formula (12) and (13) respectively:

$G_p(X_g,Y_{\mathrm{gi}},Z_g)=(\frac{x_g\·Y_{\mathrm{gi}}}{y_g},Y_{\mathrm{gi}},\frac{(1-x_g-y_g)\·Y_{\mathrm{gi}}}{y_g})\·\·\·\left(12\right)$

$B_p(X_b,Y_{\mathrm{bi}},Z_b)=(\frac{x_b\·Y_{\mathrm{bi}}}{y_b},Y_{\mathrm{bi}},\frac{(1-x_b-y_b)\·Y_{\mathrm{bi}}}{y_b})\·\·\·\left(13\right)$

By aforementioned formula (10), (11), (12) and (13) as can be known, the theoretical tristimulus values (X of this display ideal white under a certain target colour temperature _Wi, Y _Wi, Z _Wi), respectively as following formula (14), (15) and (16) expression:

$X_{\mathrm{wi}}=\frac{x_r\·Y_{\mathrm{ri}}}{y_r}+\frac{x_g\·Y_{\mathrm{gi}}}{y_g}+\frac{x_b\·Y_{\mathrm{bi}}}{y_b}\·\·\·\left(14\right)$

Y _wi＝Y _ri+Y _gi+Y _bi…………………………………………………………(15)

$Z_{\mathrm{wi}}=\frac{(1-x_r-y_r)\·Y_{\mathrm{ri}}}{y_r}+\frac{(1-x_g-y_g)\·Y_{\mathrm{gi}}}{y_g}+\frac{(1-x_b-y_b)\·Y_{\mathrm{bi}}}{y_b}\·\·\·\left(16\right)$

At this moment, formula (14), (15) and (16) are separated simultaneous equations, can try to achieve the desirable red brightness Y of ideal white system that this display presents by how many ratios _Ri, green brightness Y _Gi, blue brightness Y _BiCombine Deng institute.

When the three primary colors to this display carry out gain compensation, mainly mean when trichromatic proportion of composing is too high, with the past decline of its proportion of composing, or cross when low when trichromatic proportion of composing, with the past rising of its proportion of composing, surpass or not enough part with the compensation color, make this display can present best color representation.Therefore, when the present invention carries out gain compensation at the three primary colors to this display, be that three primary colors proportion of composing with aforementioned ideal white is as benchmark, when the three primary colors proportion of composing of the white that this display presented is higher than this benchmark, with less than 1 yield value, it is compensated; On the contrary, when the three primary colors proportion of composing of the white that this display presented is lower than this benchmark, then, it is compensated with greater than 1 yield value; In other words, this compensating gain value system is inversely proportional to the three primary colors proportion of composing value of the white that this display is presented, and following formula (17) is the yield value (c that the Red Green Blue of this display is carried out gain compensation in order to calculate _r, c _g, c _b):

$(c_r,c_g,c_b)=(\frac{Y_{\mathrm{ri}}}{Y_{\mathrm{rp}}},\frac{Y_{\mathrm{gi}}}{Y_{\mathrm{gp}}},\frac{Y_{\mathrm{bi}}}{Y_{\mathrm{bp}}})\·\·\·\left(17\right)$

Now for making design concept of the present invention more explicit, spy of the present invention enumerates some embodiment, consults shown in the 1st, 3 and 4 figure, cooperates experimental data shown in Figure 2, and it is as follows to illustrate that three primary colors to display carry out the mode and the process of gain compensation:

In first embodiment of the present invention, consult shown in Figure 1ly again, be to utilize the panel 11 of 10 pairs one displays of an instrument to measure, measure the colo(u)r bias of this panel 11 under the 10600K colour temperature and be-0.002duv, its white chromatic value W _p(x _Wp, y _Wp, Y _Wp) be (0.2792,0.2821,70.44), this instrument 10 is sent to an arithmetic element 13 with measured data, calculates; This arithmetic element 13 will read the chromaticity coordinate W of the ideal white of a known target colour temperature 9300K _i(x _Wi, y _Wi) be (0.28528,0.29299), simultaneously, choose the chromaticity coordinate R (0.64 of the Red Green Blue of EBU vision signal standard respectively, 0.33), G (0.29,0.6) and B (0.15,0.06), and with described numerical value difference substitution formula (7), (8) and (9) and formula (14), (15) and (16) middle calculating, in the hope of (Y _Rp, Y _Gp, Y _Bp) and (Y _Ri, Y _Gi, Y _Bi) as follows:

(Y _rp，Y _gp，Y _bp)＝(0.0562717，0.1956217，0.0302066)………………(18)

(Y _ri，Y _gi，Y _bi)＝(0.0588305，0.2053955，0.0287640)…………………(19)

With (Y _Rp, Y _Gp, Y _Bp) and (Y _Ri, Y _Gi, Y _Bi) numerical value substitution formula (17), can try to achieve the one group of yield value (c that carries out gain compensation in order to Red Green Blue to this display _r, c _g, c _b) be (1.04547,1.04996,0.95224), last, this arithmetic element 13 will be organized yield value again and write in the built-in memory 1231 of a scale controller (Scaler) set on the system circuit board 12 of this display 123.So, after vision signal (video signal) is input to this system circuit board 12, a video signal decoder (Video Decoder) 121 and one release of an interleave scanner (De-interlacer) 122 set on this system circuit board 12 will be deciphered and release of an interleave this vision signal in regular turn, and through this scale controller 123, should organize yield value according to stored in this memory 1231, red to this vision signal, green, after primary colors compensate, this vision signal exports this panel 11 again to, so that can present best color representation on this panel 11.

In addition, because the yield value (1.04547 that is calculated, 1.04996,0.95224) have a mark, it is very complicated in the design of digital circuit, and operation program and time are complicated, so for the convenience on the Design of Digital Circuit, in this embodiment, be yield value (c with Red Green Blue _r, c _g, c _b) convert to and be 1 ratio value (g to the maximum _r, g _g, g _b), and according to following formula (20) and (21), with this ratio value (g _r, g _g, g _b) power power with 2 is doubly (as 2 ⁷=128 times) zoomed into integer:

$(g_r,g_g,g_b)=(\frac{c_r}{\mathrm{Max}(c_r,c_g,c_b)},\frac{c_g}{\mathrm{Max}(c_r,c_g,c_b)},\frac{c_b}{\mathrm{Max}(c_r,c_g,c_b)})\·\·\·\left(20\right)$

(G _r，G _g，G _b)＝(128×g _r，128×g _g，128×g _b)…………………………(21)

So, shown in formula (21), yield value (G _r, G _g, G _b) be converted into (127,128,116) after, again it is write in this built-in memory 1231 of this scale controller 123, promptly finish adjustment operation automatically to the Red Green Blue of this display.

Detect with 10 pairs of these panels 11 of this instrument again, color temperature value and colour cast difference with this panel 11 after the affirmation adjustment, its color temperature value is adjusted near desirable target color temperature value 9210K by 10600K originally, its colour cast difference is by-0.002 being adjusted to more approaching desirable aim colour deviate-0.0004 originally, consult experimental data shown in Figure 2 as can be known, utilize method of the present invention can calculate trichromatic correct yield value really, and adjust this display according to this, make its output can more approach desirable target color temperature value and colour cast difference, can know by experimental data shown in Figure 2 again and learn, utilize method of the present invention, repeatedly test, all can obtain good effect.

According to the above as can be known, method of the present invention can calculate required yield value (G immediately after each display before the shipment is detected _r, G _g, G _b), and under the situation that need not manual adjustment operation fully, automatically with this yield value (G _r, G _g, G _b) write in the memory 1231 in the scale controller (Scaler) 123, compensate with the Red Green Blue of automatically this panel 11 being exported, make it present best color representation, waste in man-hour and the human error of effectively avoiding manual adjustment process to be caused, and accelerated adjustment speed to each display gray level white balance, and can carry out adjustment automatically according to the gray level white balance characteristic of each display, make each display of finishing detection and adjustment all can reach best color representation.

What this need pay special attention to be, previous embodiment only is a most preferred embodiment of the present invention, in second embodiment of the present invention, consult shown in Figure 3, this display comprises a system circuit board 22 and a panel 21, at least comprise a video signal decoder 221 on this system circuit board 22, one release of an interleave scanner 222, one scale controller 223 and a memory 2231, this video signal decoder 221 wherein, release of an interleave scanner 222 and scale controller 223 are connected in regular turn, this scale controller 223 also is connected with this memory 2231 and a panel 21 respectively, measure when 20 pairs of these panels 21 of an instrument, measure the white chromatic value W of this panel 21 under a certain colour temperature _p(x _Wp, y _Wp, Y _Wp), and after being sent to an arithmetic element 23, this arithmetic element 23 will read the white chromaticity coordinate W of a known desired color temperature _i(x _Wi, y _Wi), simultaneously, choose chromaticity coordinate R (0.64,0.33), G (0.29,0.6) and the B (0.15,0.06) of the Red Green Blue of EBU vision signal standard respectively, calculate in the substitution aforementioned formula, try to achieve one group of required yield value (G _r, G _g, G _b), and should organize yield value (G _r, G _g, G _b) write in this memory 2231.So, after vision signal is input to this system circuit board 22, this video signal decoder 221 and release of an interleave scanner 222 will be deciphered and release of an interleave it in regular turn, and through this scale controller 223, should organize yield value according to stored in this memory 2231, after the Red Green Blue of this vision signal compensated, export this panel 21 again to, so that this vision signal can present best color representation on this panel 21.

In the 3rd embodiment of the present invention, consult shown in Figure 4, this display comprises a system circuit board 32 and a panel 31, at least comprise a video signal decoder 321 on this system circuit board 32, an one release of an interleave scanner 322 and a scale controller 323, then comprise a memory 311 on this panel 31 at least, this video signal decoder 321 wherein, release of an interleave scanner 322 and scale controller 323 are connected in regular turn, this scale controller 323 also is connected with this panel 31, measure when 30 pairs of these panels 31 of an instrument, measure the white chromatic value W of this panel 31 under a certain colour temperature _p(x _Wp, y _Wp, Y _Wp), and after being sent to an arithmetic element 33, this arithmetic element 33 will read the white chromaticity coordinate W of a known desired color temperature _i(x _Wi, y _Wi), simultaneously, choose chromaticity coordinate R (0.64,0.33), G (0.29,0.6) and the B (0.15,0.06) of red, green, blue three looks of EBU vision signal standard respectively, calculate in the substitution aforementioned formula, try to achieve one group of required yield value (G _r, G _g, G _b), and should organize yield value (G _r, G _g, G _b) write in this memory 311.So, after vision signal is input to this system circuit board 32, this video signal decoder 321 and release of an interleave scanner 322 will be deciphered and release of an interleave it in regular turn, and through this scale controller 323, export this panel 31 to, in this panel 31, should organize yield value (G according to stored in this memory 311 _r, G _g, G _b), after the Red Green Blue of this vision signal compensated, again this vision signal is presented on this panel 31, make it present best color representation.

In the present invention aforesaid first and second and three embodiment; the practice that compensates in order to Red Green Blue to this display; be to see through hardware circuit to be finished; but the present invention is when actual applying; be not limited to see through hardware circuit and finish, press all this skill personages that is familiar with, according to previous designs theory of the present invention; seeing through software mode and finish, also is the protection range that the present invention advocates in this desire.In addition, the present invention only need borrow this instrument detecting to go out the white chromaticity coordinate of this display, can calculate the red, green, blue three look yield values of the gray level white balance of this display, and through hardware or software mode, Red Green Blue to this display compensates, and can make this display present best color representation.In addition, what need special were carried is, the chromaticity coordinate that method of the present invention does not limit selected Red Green Blue why, all press in the chrominance space any 3 all applicable, but generally be comparatively accurate to select this display to present the yield value that the three primary colors chromaticity coordinate in the Color Range tried to achieve.

The above only is a specific embodiment of the best of the present invention, but structural feature of the present invention is not limited thereto, and anyly is familiar with this skill person in field of the present invention, can think easily and variation or modification, all can be encompassed in the claim of this case.

Claims (7)

1. A method for automatically measuring and adjusting the grayscale white balance of a display, the method comprising: Measuring the chromaticity coordinates and luminance of white displayed on a display by means of an instrument; Select the chromaticity coordinates of the three primary colors of red, green, and blue in a known chromaticity space, and calculate the time when the three primary colors of red, green, and blue are mixed into the white displayed on the display according to the Grassman color matching law of chromaticity. the desired mixing ratio; Calculate the mixing ratio required when the three primary colors of red, green and blue are mixed to present ideal white at a certain target color temperature; and Divide the mixing ratio required when the three primary colors of red, green, and blue are mixed into an ideal white at a certain target color temperature by the ratio required when the three primary colors of red, green, and blue are mixed into the white displayed on the display Mixing ratio, and use the resulting ratio as a set of gain values for the red, green and blue primary colors of the display. 2. The method of claim 1, further comprising: The set of gain values is written into a memory of the display to perform gain compensation on the gray scale white balance of the display. 3. The method of claim 2, further comprising: When performing gain compensation on the three primary colors of the display, the composition ratio of the three primary colors of ideal white at a certain target color temperature is used as a benchmark. It is compensated; when the ratio of the three primary colors of the white displayed by the display is lower than the reference, it is compensated with a gain value greater than 1. 4. The method of claim 3, further comprising: The gain value is normalized to a ratio value whose maximum is 1, and the ratio value is multiplied by a power of 2 to an integer to improve accuracy. 5. A system for automatically measuring and adjusting the gray-scale white balance of a display, the system comprising: a display panel; A system circuit board is provided with at least one video signal decoder, a deinterlacing scanner and a zoom controller, wherein the video signal decoder is used to receive video signals and decode them, The de-interlacing scanner is connected with the video signal decoder to receive the video signal from the video signal decoder and perform de-interlacing, and the scaling controller is connected with the de-interlacing scanner and the video signal decoder respectively. The panel is connected to receive the video signal from the deinterlacing scanner, and after being scaled, it is sent to the panel. There is a memory built in the scaling controller, which is used to store the gray scale of the panel. Gain value for red, green and blue primary colors of white balance to compensate; an instrument for measuring the white chromaticity coordinates and brightness of the panel at a certain color temperature; and A computing unit, connected to the instrument and the memory respectively, to use the chromaticity coordinates and luminance of the white color transmitted from the instrument, and the chromaticity coordinates of the three primary colors of red, green and blue selected from a known chromaticity space , according to the Grassman color matching law of colorimetry, calculate the mixing ratio required when the three primary colors of red, green and blue are mixed into the white displayed on the display and the required mixing ratio for ideal white at a certain target color temperature Ratio, the mixing ratio required when the three primary colors of red, green, and blue are mixed to produce ideal white at a certain target color temperature is divided by the ratio obtained when the three primary colors of red, green, and blue are mixed to produce white on the display The desired mixing ratio is used, and the obtained ratio is used as a set of gain values of the red, green, and blue primary colors of the display, and the set of gain values is written into the memory. 6. A system for automatically measuring and adjusting the gray-scale white balance of a display, the system comprising: a display panel; A system circuit board, on which at least one video signal decoder, a deinterlacing scanner, a scaling controller and a memory are arranged, wherein the video signal decoder is used to receive video signals and decode them code, the de-interlacing scanner is connected with the video signal decoder to receive the video signal from the video signal decoder and de-interlace it, and the scaling controller is respectively connected with the de-interlacing scanning connected to the panel to receive the video signal from the de-interlacing scanner, and after being scaled, sent to the panel; the memory is connected to the scaling controller to store the grayscale of the panel Gain value for compensating the red, green and blue primary colors of step white balance; an instrument for measuring the chromaticity coordinates and luminance of the white color presented by the panel at a certain color temperature; and A computing unit, connected to the instrument and the memory respectively, so that according to the white chromaticity coordinates and brightness transmitted from the instrument, and the chromaticity coordinates of the three primary colors of red, green and blue selected from a known chromaticity space, According to the Grassman color matching law of chromaticity, calculate the mixing ratio required when the three primary colors of red, green and blue are mixed into the white displayed on the display and the required mixing ratio for ideal white at a certain target color temperature , divide the mixing ratio required when the three primary colors of red, green, and blue are mixed into an ideal white at a certain target color temperature by the ratio required when the three primary colors of red, green, and blue are mixed into the white displayed on the display The mixing ratio is used as a set of gain values for the red, green and blue primary colors of the display, and the set of gain values is written into the memory. 7. A system for automatically measuring and adjusting the gray-scale white balance of a display, the system comprising: A panel of a display, on which at least one memory is arranged, and the memory is used to store gain values for compensating the red, green and blue primary colors of the grayscale white balance of the panel; A system circuit board, on which at least one video signal decoder, a deinterlacing scanner and a scaling controller are arranged, wherein the video signal decoder is used to receive video signals and decode them, the The deinterlacing scanner is connected with the video signal decoder to receive the video signal from the video signal decoder and perform deinterlacing on it, and the scaling controller is connected with the deinterlacing scanner and the panel respectively connected to receive the video signal from the de-interlacing scanner, and transmit it to the panel after being scaled; an instrument for measuring the chromaticity coordinates and luminance of the white color displayed by the panel at a certain color temperature; and A computing unit, connected to the instrument and the memory respectively, to use the chromaticity coordinates and luminance of the white color transmitted from the instrument, and the chromaticity coordinates of the three primary colors of red, green and blue selected from a known chromaticity space , according to the Grassman color matching law of colorimetry, calculate the mixing ratio required when the three primary colors of red, green and blue are mixed into the white displayed on the display and the required mixing ratio for ideal white at a certain target color temperature Ratio, the mixing ratio required when the three primary colors of red, green, and blue are mixed to produce ideal white at a certain target color temperature is divided by the ratio obtained when the three primary colors of red, green, and blue are mixed to produce white on the display The desired mixing ratio is used, and the obtained ratio is used as a set of gain values of the red, green, and blue primary colors of the display, and the set of gain values is written into the memory. the

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