CN101163253B - Method and device for searching new color temperature point - Google Patents

Abstract

A method of finding new color temperature point is used for a color display. A color temperature point of the highest brightness is formed under the state that the color display radiates the red light, the green light and the blue light with the highest brightness. The new color temperature point finding method is using a calculating method to ensure that the new color temperature point satisfies the specific color temperature for adjustment and loses least brightness.

Description

Seek the method and the device thereof of new color temperature point

Technical field

The present invention relates to adjust the colour temperature technology of color monitor, particularly relate to and be applied to the colour temperature adjustment carried out after the production of color monitor hardware is finished.

Background technology

What various Display Technique was pursued will verily present through display system by the natural picture of camera lens acquisition exactly, and wherein the colour temperature adjustment technology is an indispensable ring.Different light source irradiation, the color difference that will cause the human eye perceives object to be showed, so when watching film, different pictures is because of the difference of spot for photography and time, to cause the variation of light source, and following of Different Light take the photograph image have the performance of different colour temperature, if display has only fixing colour temperature output, and the being seen picture loyalty of human eye can't be presented.In addition, different ethnic groups cause Asian's preference warm colour system because iris color is deep mixed, and the European then likes cool colour system, so also will do different color temperature corrections at the country variant user.

Patent of invention " the colour temperature adjusting process and the device thereof of color monitor " (No. the 200532637th, Taiwan patent disclosure) provides the method for a kind of adjustment display color temperature (color temperature), be on the CIE1931xyY chromatic diagram, stipulate the corresponding (x of target colour temperature ₁, y ₁) chromaticity coordinate, then measurement obtains the current colour temperature of display and is converted to corresponding (x ₂, y ₂) chromaticity coordinate, judge (x ₂, y ₂) to (x ₁, y ₁) the trend of vectorial R, increase or reduce the output reference of ruddiness (R), green (G) light, indigo plant (R) light then respectively according to the trend of vectorial R, whether the colour temperature that at last measures display again near the target colour temperature, with the action that determines whether to repeat to finely tune.This kind colour temperature adjusting process can only the dependence experience decide the strong and weak degree of adjusting red, green, blue, can't make the quantitative analysis of effect, and need spended time to adjust repeatedly, and fail to provide rapidly a kind of and adjusting process accurately.

Another patent of invention " LCD colour temperature automation regulating system and method " (Taiwan patent I246319 number) is the adjusting process about colour temperature, the x of target setting colour temperature at first, the y value, follow the display x that measurement obtains, the y value, indivedual relatively sizes of x, y value decide to be increased or the output reference of minimizing R, G, B, and the action that repeats to measure and adjust makes the colour temperature of display more and more near the target colour temperature.Yet on the CIE1931xyY chromatic diagram, color temperature point to the direction of R, G, B can't be parallel to x axle or y axle, so no matter be which output reference that increases or reduce among R, G, the B, the capital changes x value and y value simultaneously, therefore, this method can only approached color temperature point at leisure in constantly measuring relatively, not only time-consuming but also can't provide one group to separate accurately.

Another patent of invention " the color correction circuit and the method thereof of LCD " (No. the 200521605th, Taiwan patent disclosure) " be the color selected cell of setting up a color temperature value and gamma option; and this color selected cell is stored in the options that many group colour temperatures and gamma (Gamma; the ratio of brightness and gray scale) value are provided in the read only memory ROM (Read-Only Memory); after the user selectes; produce a corrected parameter value that corresponds to selecteed color temperature value and gamma measuring value by functional operation; then with this corrected parameter value loading parameters buffer unit, to reach the adjustment of colour temperature and gamma.This kind bearing calibration is by functional operation, method compared to preceding two pieces of patents of invention (No. the 200532637th, Taiwan patent disclosure and Taiwan patent I246319 number), comparatively quick, but its shortcoming is to lack the complete algorithm that a cover is set up according to scientific theory, whether its adjustment principle has is considered that every result that may influence (as the loss of brightness) still treats the merchant really, so its adjustment result's accuracy and effect difficulty have convincingness.

Summary of the invention

The present invention utilizes scientific methods to reach the adjustment of colour temperature from color science colour mixture principle, is able to calculate exactly at short notice parameters, breaks away from the method that the experience of many dependences is in the past proofreaied and correct colour temperature.Desire the colour temperature of adjustment display, be bound to such an extent that change brightness (Brightness) ratio of R, G, B, yet for display itself (the especially projection display), brightness normally influences the key factor of price, if lose too many brightness in order to pursue suitable colour temperature, the method for this kind adjustment colour temperature does not just have too big value so.The present invention introduces the notion of correlated colour temperature, by color science as can be known, the isotemperature line of correlated colour temperature, though its chromaticity coordinate difference, but the colourity that black matrix showed of human eye perceives and this temperature is the most approaching, utilize this characteristic and cooperate the colour mixture principle, develop the algorithm that to be adjusted to specific colour temperature and lose minimum brightness.For achieving the above object, the present invention's method of seeking new color temperature point comprises the following steps:

Steps A: find out the coordinate of a maximum brightness color temperature point, wherein the coordinate of this maximum brightness color temperature point is meant the coordinate on a two-dimentional yardstick chromatic diagram;

Step B: provide a target isotemperature line on this two dimension yardstick chromatic diagram; And

Step C: calculate the coordinate of a new color temperature point, wherein:

The coordinate of this new color temperature point is meant the coordinate on this two dimension yardstick chromatic diagram;

This new color temperature point is in fact on wherein any of this target isotemperature line; And

In the calculating of embodiment, this new color temperature point satisfies this color monitor in fact at impairment red light, green light and the minimum state of blue light overall brightness,

The method of wherein finding out the coordinate of this maximum brightness color temperature point in steps A comprises the following steps:

Find out this color monitor and respectively send under the high state of brightness at three apex coordinates of this two dimension yardstick chromatic diagram in red light, green light and blue light, this three apex coordinate is defined as red light apex coordinate, green light apex coordinate and blue light apex coordinate respectively; And

Calculate the coordinate of this maximum brightness color temperature point, wherein the coordinate of this maximum brightness color temperature point is the focus point coordinate of this three apex coordinate,

Wherein the coordinate that calculates this new color temperature point in step C comprises the following steps:

A red light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this red light brightness reduces line, and this red light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this green light summit and this blue light summit, and wherein the red light brightness of any point is low than the red light brightness of this maximum brightness color temperature point on this red light brightness minimizing line;

A green light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this green light brightness reduces line, and this green light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this red light summit and this blue light summit, and wherein the green light brightness of any point is low than the green light brightness of this maximum brightness color temperature point on this green light brightness minimizing line;

A blue light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this blue light brightness reduces line, and this blue light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this green light summit and this red light summit, and wherein the blue light brightness of any point is low than the blue light brightness of this maximum brightness color temperature point on this blue light brightness minimizing line; And

Calculate the coordinate of this new color temperature point, wherein this new color temperature point is that this target isotemperature line and this red light brightness reduce line, this green light brightness reduces line and this blue light brightness reduces the formed crosspoint of line.Mean in red light at the minimum state of impairment overall brightness, in fact only reduce the brightness of a light wherein in green light and the blue light.

Method of the present invention can be applicable to seek the device of new color temperature point, and the device of seeking new color temperature point comprises a signal generator, an optical sensor, a color analyzer and a computer.Computer includes a processor and a memory, and this memory comprises that a computer software carries out to reach above-mentioned said steps A～C for processor.

Description of drawings

Fig. 1 shows the schematic diagram that redness, green and blue light apex coordinate are positioned at two-dimentional yardstick chromatic diagram.

Fig. 2 is the environment for use schematic diagram of the present invention about the device of searching new color temperature point.

Fig. 3 shows the schematic diagram of maximum brightness color temperature point.

Fig. 4 shows as the luminance loss and is controlled in more among a small circle a schematic diagram.

Fig. 5 shows as the luminance loss and is controlled in a big way a schematic diagram.

Fig. 6 is that the present invention is about seeking the flow chart of new color temperature point.

Fig. 7 shows the schematic diagram of target isotemperature line in two-dimentional yardstick chromatic diagram.

Fig. 8 shows the schematic diagram of new color temperature point.

The reference numeral explanation

Coordinate (the x of maximum brightness color temperature point _w, y _w)

Maximum brightness color temperature point W

New color temperature point W _nCoordinate (the x of new color temperature point _Wn, y _Wn)

Two dimension yardstick colourity Figure 20 color representation zone 21

Target isotemperature line 30

Red light apex coordinate R (x _r, y _r) green light apex coordinate G (x _g, y _g)

Blue light apex coordinate B (x _b, y _b) gamut boundary T _S, T _L, T _N

Seek device 70 optical sensors 71 of new color temperature point

Color analysis instrument 72 computers 73

Signal generator 74 color monitors 90

Embodiment

Fig. 1 shows the schematic diagram of two-dimentional yardstick colourity Figure 20, and two-dimentional yardstick colourity Figure 20 the most generally uses at present be XYZ chromaticity diagram, be to utilize two-dimensional coordinate (such as x, y coordinate) to describe color, and with the various colors of regional 21 demonstrations of color representation.

Chromaticity coordinate when Fig. 1 has shown a color monitor at pure red (R), pure green (G), ethereal blue (B) and for the brightest picture is defined as red light apex coordinate R (x respectively _r, y _r), green light apex coordinate G (x _g, y _g) and blue light apex coordinate B (x _b, y _b).Color monitor is the screen that computer or TV are used for example, and the kind of display for example is the display of video picture tubular type, light-emitting diode display, projection display or the like.

Fig. 2 is the environment for use schematic diagram of the present invention about the device of searching new color temperature point.The device 70 of seeking new color temperature point comprises optical sensor 71, one color analyzers, 72, one computers 73 and a signal generator 74.Signal generator 74 is in order to produce specific figure input color display 90, behind the image by optical sensor 71 acquisition color monitors 90, color analysis instrument 72 can measure the color information (colour temperature, brightness and the colourity that for example comprise each gray scale) of color monitor 90 and these data be passed to computer 73 do computing again.Computer 73 makes the colour temperature of color monitor 90 and gamma change the new line form (LUT, Look Up Table) that the result of high-high brightness correlated colour temperature algorithm computing loads color monitor 90.Because optical sensor 71, color analysis instrument 72, computer 73 (comprising a processor 731 and a memory 732) and signal generator 74 are all known hardware unit, therefore repeat no more the framework of these hardware units below, be described in detail about the computing of high-high brightness correlated colour temperature algorithm and be primarily aimed at emphasis of the present invention.

The definition of general color monitor 90 colour temperatures is when complete white picture, behind the image by optical sensor 71 acquisition color monitors 90, and the value that is measured through color analysis instrument 72 again.Quan Baiyuan is meant the color of being mixed out by any same grayscale R, G, B three looks, but because display is subjected to the influence of light leak easily when low-light level, make colour temperature produce deviation, be all the full picture in vain that the brightest time mixes out so must transfer to R, G, B three looks to picture usually when measuring colour temperature.Chromaticity coordinate R (x when therefore R, G, B three looks distinctly the brightest _r, y _r), G (x _g, y _g) and B (x _b, y _b) can obtain by measurement; R, G, B three looks high-high brightness Y out of the ordinary in addition _r, Y _g, Y _b(be a hypothesis parameter, figure does not show), also measurement obtained respectively.

The explanation of following Fig. 3～5 is the basic background principles that are used for explaining the technology of the present invention.In addition in order to allow drawing oversimplify X, Y-axis that two-dimentional yardstick colourity Figure 20 is no longer drawn in following Fig. 3～5 and Fig. 7～8, and the color representation zone 21 on two-dimentional yardstick colourity Figure 20.

Fig. 3 shows the schematic diagram of maximum brightness color temperature point W.In the cie color space, each point is all represented different colourity, the different colourity light of the twice light that mixes out arbitrarily, its colourity that shows must 2 certain on online a bit, this is similar to physical position of centre of gravity.Explain that with Fig. 3 D, E, 3 of F are respectively the center of gravity of BR line segment, RG line segment, GB line segment, RF, GD, three center of gravity line of BE with intersection in 1 W, because R, G, the B three looks coordinate when out of the ordinary the brightest is R (x _r, y _r), G (x _g, y _g) and B (x _b, y _b), so W point expression maximum brightness color temperature point (x _w, y _w).

Maximum brightness color temperature point (x _w, y _w) can be expressed as:

$x_w=\frac{m_r{x}_r+m_g{x}_g+m_b{x}_b}{m_r+m_g+m_b}=\frac{\frac{Y_r}{y_r}{x}_r+\frac{Y_g}{y_g}{x}_g+\frac{Y_b}{y_b}{x}_b}{\frac{Y_r}{y_r}+\frac{Y_g}{y_g}+\frac{Y_b}{y_b}}\·\·\·\left(1\right)$

$y_w=\frac{m_r{y}_r+m_g{y}_g+m_b{y}_b}{m_r+m_g+m_b}=\frac{Y_r+Y_g+Y_b}{\frac{Y_r}{y_r}+\frac{Y_g}{y_g}+\frac{Y_b}{y_b}}\·\·\·\left(2\right)$

Can get by the arrangement of 1,2 formulas

$\left(\frac{x_w-x_r}{y_r}\right)Y_r+\left(\frac{x_w-x_g}{y_g}\right)Y_g+\left(\frac{x_w-x_b}{y_b}\right)Y_b=0\·\·\·\left(3\right)$

$\left(\frac{y_w-y_r}{y_r}\right)Y_r+\left(\frac{y_w-y_g}{y_g}\right)Y_g+\left(\frac{y_w-y_b}{y_b}\right)Y_b=0\·\·\·\left(4\right)$

Order $\left(\frac{x_w-x_r}{y_r}\right)=A,\left(\frac{x_w-x_g}{y_g}\right)=B,\left(\frac{x_w-x_b}{y_b}\right)=C,$

$\left(\frac{y_w-y_r}{y_r}\right)=D,\left(\frac{y_w-y_g}{y_g}\right)=E,\left(\frac{y_w-y_b}{y_b}\right)=F$

3,4 formulas can be write as:

AY _r+BY _g+CY _b＝0 ……………(5)

DY _r+EY _g+FY _b＝0 ……………(6)

To can get after F * (5)-C * (6) and the arrangement

$\frac{Y_r}{Y_g}=\frac{\mathrm{FB}-\mathrm{CE}}{\mathrm{CD}-\mathrm{FA}}$

$Y_r:Y_g=\left|\begin{array}{cc}B& C\\ E& F\end{array}\right|:\left|\begin{array}{cc}C& A\\ F& D\end{array}\right|=\left|\begin{array}{cc}\frac{x_w-x_g}{y_g}& \frac{x_w-x_b}{y_b}\\ \frac{y_w-y_g}{y_g}& \frac{y_w-y_b}{y_b}\end{array}\right|:\left|\begin{array}{cc}\frac{x_w-x_b}{y_b}& \frac{x_w-x_r}{y_r}\\ \frac{y_w-y_b}{y_b}& \frac{y_w-y_r}{y_r}\end{array}\right|$

In like manner, can push away

$Y_r:Y_b=\left|\begin{array}{cc}\frac{x_w-x_g}{y_g}& \frac{x_w-x_b}{y_b}\\ \frac{y_w-y_g}{y_g}& \frac{y_w-y_b}{y_b}\end{array}\right|:\left|\begin{array}{cc}\frac{x_w-x_r}{y_r}& \frac{x_w-x_g}{y_g}\\ \frac{y_w-y_r}{y_r}& \frac{y_w-y_g}{y_g}\end{array}\right|$

That is to say that under the situation that does not change R, G, B chromaticity coordinate, desire is adjusted colour temperature to specific white point and (referred to herein as W (x _w, y _w)), brightness to the ratio that must adjust R, G, B is

$Y_r:Y_g:Y_b=\left|\begin{array}{cc}\frac{x_w-x_g}{y_g}& \frac{x_w-x_b}{y_b}\\ \frac{y_w-y_g}{y_g}& \frac{y_w-y_b}{y_b}\end{array}\right|:\left|\begin{array}{cc}\frac{x_w-x_b}{y_b}& \frac{x_w-x_r}{y_r}\\ \frac{y_w-y_b}{y_b}& \frac{y_w-y_r}{y_r}\end{array}\right|:\left|\begin{array}{cc}\frac{x_w-x_r}{y_r}& \frac{x_w-x_g}{y_g}\\ \frac{y_w-y_r}{y_r}& \frac{y_w-y_g}{y_g}\end{array}\right|\·\·\·\left(7\right)$

For color monitor 90, we do not wish to sacrifice too many brightness because of adjusting colour temperature, so need find out the method for sacrificing minimum brightness.Method is as described below: R, G, the B high-high brightness Y of color monitor 90 itself _r, Y _g, Y _bBe adjusted to the required brightness ratio Y of a fresh target colour temperature on indivedual the removing _Rnew, Y _Gnew, Y _Bnew $a_r=\frac{Y_r}{Y_{\mathrm{rnew}}},$ $a_g=\frac{Y_g}{Y_{\mathrm{gnew}}},$ $a_b=\frac{Y_b}{Y_{\mathrm{bnew}}}$

Get a _r, a _g, a _bOn behalf of it, middle numerical value reckling be in course of adjustment and is reached limit of brightness the earliest, supposes the minimum a that is _Min=min (a _r, a _g, a _b), again this numerical value is taken advantage of back Y _Rnew, Y _Gnew, Y _Bnew

Y _{r_tuned}＝a _min?Y _rnew

Y _{g_tuned}＝a _min?Y _gnew

Y _{b_tuned}＝a _min?Y _bnew

Adjusted brightness is and is adjusted to the target colour temperature, the required brightness of each color.

One group of R, G, B brightness ratio correspond to a color temperature point, reduce total brightness so, just give a tolerance value and do allotment for R, G, B, can obtain many different color temperature points.Can calculate a gamut boundary T according to the colour mixture principle _S, as shown in Figure 4.This gamut boundary T _sIn representative loss brightness be no more than under the situation of a certain tolerance value, allocate the color temperature point scope that R, G, B brightness are showed arbitrarily, and this gamut boundary T _sTo be that one three summit lays respectively at the triangle that three centers of gravity online (RF, GD, BE) are constituted.

If it is bigger to reduce total brightness, will be as shown in Figure 5, gamut boundary T _LCan be bigger.

Above-mentioned explanation is the theoretical foundation that the technology of the present invention derives out, below please refer to Fig. 6 seeks new color temperature point about the present invention flow chart.

Step 601:

Find out the coordinate of a maximum brightness color temperature point W, wherein the coordinate of this maximum brightness color temperature point W is meant the coordinate on a two-dimentional yardstick colourity Figure 20.Step 601 promptly is to find out the coordinate (x of above-mentioned said maximum brightness color temperature point W _w, y _w): R (x _r, y _r), G (x _g, y _g) and B (x _b, y _b).

This step is as illustrating as described in above-mentioned Fig. 2 the coordinate (x of maximum brightness color temperature point W _w, y _w) and R, G, B three looks high-high brightness Y out of the ordinary _r, Y _g, Y _bCan obtain by the optical sensor 71 and the color analysis instrument 72 of the device 70 of seeking new color temperature point.

Step 602:

Provide a target isotemperature line 30 on this two dimension yardstick colourity Figure 20.Please refer to Fig. 7, this target isotemperature line 30 is main to be according to the demand on the market, such as Asian's preference warm colour system, and the European then likes cool colour system, so also will do different color temperature corrections at the country variant user.

Step 603:

Calculate a new color temperature point W _nCoordinate (x _Wn, y _Wn).

By target isotemperature line 30, in fact can find out the minimum gamut boundary T of a loss brightness _N, and new color temperature point W _nExcept meeting this target isotemperature line wherein a bit on because it is minimum to satisfy loss brightness, the minimum gamut boundary T of loss brightness _NTo find minimum triangle exactly, therefore new color temperature point W in fact _nCan drop on gamut boundary T _NOn this vertex of a triangle.

And as the explanation of above-mentioned principle, gamut boundary T _NTo be that one three summit lays respectively at the triangle that three centers of gravity online (RF, GD, BE) are constituted, therefore in fact the crosspoint of target isotemperature line 30 and three centers of gravity online (RF, GD, BE) be new color temperature point W _n

Be noted that target isotemperature line 30 and three centers of gravity be online another crosspoint W _e, but crosspoint W _eBe not at gamut boundary T _NIn, so crosspoint W _eIt is not new color temperature point.Therefore more accurate being described below:

Target isotemperature line 30 reduces line WF with red light brightness, and green light brightness reduces line WD and the formed crosspoint of blue light brightness minimizing line WE is new color temperature point W _nWherein

It is the line segment that maximum brightness color temperature point W is ordered to F that red light brightness reduces line WF;

It is the line segment that maximum brightness color temperature point W is ordered to D that green light brightness reduces line WD; And

It is the line segment that maximum brightness color temperature point W is ordered to E that blue light brightness reduces line WE.

For trying to achieve new color temperature point W _n, mathematics is promptly very simple in computing, can calculate the representative formula that redness, green and blue light brightness reduce line WF, WD, WE earlier, and the formula (perhaps describing the coordinate points of target isotemperature line 30) of obtaining target isotemperature line 30 can be calculated new color temperature point W _nBecause line segment and crosspoint computing are basic mathematical (can with reference to the mathematics textbook of senior middle school), therefore do not give unnecessary details the computing of mathematics at this.

Above step is relevant to be needed to calculate or data provide or note down and can be finished by the computer 73 of the device 70 of new color temperature point.

Be noted that though above-mentioned have a principle of mentioning " gamut boundary ", in fact the present invention has not been about having needed the triangle of computing " gamut boundary " in the method for seeking new color temperature point, and calculates comparatively fast in the mode of step 603.

Be noted that the coordinate (x of the new color temperature point that above-mentioned steps is found out in addition _Wn, y _Wn) be loss brightness minimum optimum solution, but near the scope that the suboptimal solution of color temperature point coordinate is also protected for this patent looking for by this optimum solution.

In sum, no matter the present invention all shows it totally different in the feature of prior art with regard to purpose, means and effect.It should be noted that above-mentioned many embodiment only are giving an example for convenience of explanation, protection scope of the present invention be from should being as the criterion with claim of the present invention, but not only limits to the foregoing description.

Claims (10)

1. method of seeking new color temperature point, be used for a color monitor, this color monitor can send red light, green light and blue light, wherein respectively send the highest state of brightness in red light, green light and blue light at this color monitor, form a maximum brightness color temperature point, this seeks new color temperature point (W _n) method comprise the following steps:

Steps A: the coordinate (x that finds out a maximum brightness color temperature point _w, y _w), the coordinate (x of this maximum brightness color temperature point wherein _w, y _w) be meant the coordinate on a two-dimentional yardstick chromatic diagram;

Step B: provide a target isotemperature line on this two dimension yardstick chromatic diagram; And

Step C: calculate a new color temperature point (W _n) coordinate (x _Wn, y _Wn), wherein:

This new color temperature point (W _n) coordinate (x _Wn, y _Wn) be meant the coordinate on this two dimension yardstick chromatic diagram;

This new color temperature point (W _n) on wherein any of this target isotemperature line; And this new color temperature point (W _n) satisfy this color monitor at impairment red light, green light and the minimum state of blue light overall brightness,

The method of wherein finding out the coordinate of this maximum brightness color temperature point in steps A comprises the following steps:

Find out this color monitor and respectively send under the high state of brightness at three apex coordinates of this two dimension yardstick chromatic diagram in red light, green light and blue light, this three apex coordinate is defined as red light apex coordinate, green light apex coordinate and blue light apex coordinate respectively; And

Calculate the coordinate of this maximum brightness color temperature point, wherein the coordinate of this maximum brightness color temperature point is the focus point coordinate of this three apex coordinate,

Wherein the coordinate that calculates this new color temperature point in step C comprises the following steps:

A red light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this red light brightness reduces line, and this red light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this green light summit and this blue light summit, and wherein the red light brightness of any point is low than the red light brightness of this maximum brightness color temperature point on this red light brightness minimizing line;

A green light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this green light brightness reduces line, and this green light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this red light summit and this blue light summit, and wherein the green light brightness of any point is low than the green light brightness of this maximum brightness color temperature point on this green light brightness minimizing line;

A blue light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this blue light brightness reduces line, and this blue light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this green light summit and this red light summit, and wherein the blue light brightness of any point is low than the blue light brightness of this maximum brightness color temperature point on this blue light brightness minimizing line; And

Calculate the coordinate of this new color temperature point, wherein this new color temperature point is that this target isotemperature line and this red light brightness reduce line, this green light brightness reduces line and this blue light brightness reduces the formed crosspoint of line.

2. the method for searching new color temperature point as claimed in claim 1 wherein in step C, is meant the brightness that only reduces a light wherein in red light, green light and blue light at impairment red light, green light and the minimum state of blue light overall brightness.

3. the method for searching new color temperature point as claimed in claim 2 wherein should be meant XYZ chromaticity diagram by two dimension yardstick chromatic diagram.

4. the method for searching new color temperature point as claimed in claim 1 wherein should be meant XYZ chromaticity diagram by two dimension yardstick chromatic diagram.

5. the method for searching new color temperature point as claimed in claim 1 wherein in step C, is meant the brightness that only reduces a light wherein in red light, green light and blue light at impairment red light, green light and the minimum state of blue light overall brightness.

6. device of seeking new color temperature point, be used for a color monitor, this color monitor can send red light, green light and blue light, wherein respectively send the highest state of brightness in red light, green light and blue light at this color monitor, form a maximum brightness color temperature point, the device of this searching new color temperature point comprises:

One signal generator is imported this color monitor in order to produce specific figure;

One optical sensor is in order to capture the image of this color monitor;

One color analyzer, be connected with this optical sensor with behind the image of obtaining this color monitor to measure the color information of this color monitor;

One computer is connected to obtain the color information of this color monitor with this color analysis instrument, and this computer includes a processor and a memory, and this memory comprises that a computer software carries out to reach the following step for this processor:

Steps A: the coordinate (x that finds out a maximum brightness color temperature point _w, y _w), the coordinate (x of this maximum brightness color temperature point wherein _w, y _w) be meant the coordinate on a two-dimentional yardstick chromatic diagram;

Step B: provide a target isotemperature line on this two dimension yardstick chromatic diagram; And

Step C: calculate a new color temperature point (W _n) coordinate (x _Wn, y _Wn), wherein:

This new color temperature point (W _n) coordinate (x _Wn, y _Wn) be meant the coordinate on this two dimension yardstick chromatic diagram;

This new color temperature point (W _n) on wherein any of this target isotemperature line; And

This new color temperature point (W _n) satisfy this color monitor at impairment red light, green light and the minimum state of blue light overall brightness,

The method of wherein finding out the coordinate of this maximum brightness color temperature point in steps A comprises the following steps:

Find out this color monitor and respectively send under the high state of brightness at three apex coordinates of this two dimension yardstick chromatic diagram in red light, green light and blue light, this three apex coordinate is defined as red light apex coordinate, green light apex coordinate and blue light apex coordinate respectively; And

Calculate the coordinate of this maximum brightness color temperature point, wherein the coordinate of this maximum brightness color temperature point is the focus point coordinate of this three apex coordinate,

Wherein the coordinate that calculates this new color temperature point in step C comprises the following steps:

A red light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this red light brightness reduces line, and this red light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this green light summit and this blue light summit, and wherein the red light brightness of any point is low than the red light brightness of this maximum brightness color temperature point on this red light brightness minimizing line;

A green light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this green light brightness reduces line, and this green light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this red light summit and this blue light summit, and wherein the green light brightness of any point is low than the green light brightness of this maximum brightness color temperature point on this green light brightness minimizing line;

A blue light brightness that calculates on this two dimension yardstick chromatic diagram reduces line, it is a line segment that this blue light brightness reduces line, and this blue light brightness reduces coordinate that an end points coordinate of line be this maximum brightness color temperature point and the other end point coordinates middle point coordinates for the line segment that connects this green light summit and this red light summit, and wherein the blue light brightness of any point is low than the blue light brightness of this maximum brightness color temperature point on this blue light brightness minimizing line; And

Calculate the coordinate of this new color temperature point, wherein this new color temperature point is that this target isotemperature line and this red light brightness reduce line, this green light brightness reduces line and this blue light brightness reduces the formed crosspoint of line.

7. the device of searching new color temperature point as claimed in claim 6 wherein in step C, is meant the brightness that only reduces a light wherein in red light, green light and blue light at impairment red light, green light and the minimum state of blue light overall brightness.

8. the device of searching new color temperature point as claimed in claim 7 wherein should be meant XYZ chromaticity diagram by two dimension yardstick chromatic diagram.

9. the device of searching new color temperature point as claimed in claim 6 wherein should be meant XYZ chromaticity diagram by two dimension yardstick chromatic diagram.

10. the device of searching new color temperature point as claimed in claim 6 wherein in step C, is meant the brightness that only reduces a light wherein in red light, green light and blue light at impairment red light, green light and the minimum state of blue light overall brightness.

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