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

Abstract

A method for finding a new color temperature point is used for a color display, in which a color temperature point with the highest brightness is formed when red light, green light and blue light each emit the highest brightness. The method for finding the new color temperature point is to use an algorithm so that the new color temperature point meets the specific color temperature to be adjusted and loses the least brightness.

Description

Method and device for finding new color temperature point

technical field

The invention relates to a technology for adjusting the color temperature of a color display, in particular to the color temperature adjustment applied to the production of the hardware of the color display. the

Background technique

The pursuit of various display technologies is to faithfully present the natural images captured by the lens through the display system, and the color temperature adjustment technology is an indispensable part. Illumination by different light sources will cause the human eye to feel that the color of the object is different. Therefore, when watching a movie, different pictures will cause changes in the light source due to different shooting locations and times, and the images captured under different light sources have different colors. Color temperature performance, if the display only has a fixed color temperature output, it cannot faithfully present the picture seen by the human eye. In addition, due to the different shades of irises of different races, Asians prefer warmer colors, while Europeans prefer cooler colors. Therefore, different color temperature corrections must be made for users from different countries. the

The invention patent "Color Temperature Adjustment Method and Device for Color Display" (Taiwan Patent Publication No. 200532637) provides a method for adjusting the color temperature of a display, which corresponds to the target color temperature on the CIE1931xyY chromaticity diagram (x ₁ , y ₁ ) chromaticity coordinates, then measure the current color temperature of the display and convert it into the corresponding (x ₂ , y ₂ ) chromaticity coordinates, and judge (x ₂ , y ₂ ) to (x ₁ , y ₁ ), then increase or decrease the output benchmarks of red (R), green (G) and blue (R) light according to the trend of vector R, and finally re-measure whether the color temperature of the display is close to the target Color temperature to decide whether to repeat the fine-tuning action. This color temperature adjustment method can only rely on experience to determine the intensity of red, green, and blue light. It cannot make effective quantitative analysis, and it takes time to adjust repeatedly, and fails to provide a rapid and accurate adjustment. school method.

Another invention patent "Automatic Adjustment System and Method for Liquid Crystal Display Color Temperature" (Taiwan Patent No. I246319) is about the adjustment method of color temperature. First, set the x and y values of the target color temperature, and then measure the acquired x and y values of the display , Individually compare the values of x and y to determine whether to increase or decrease the output benchmarks of R, G, and B. Repeated measurement and adjustment actions make the color temperature of the display closer and closer to the target color temperature. However, on the CIE1931xyY chromaticity diagram, the direction from the color temperature point to R, G, and B is not parallel to the x-axis or the y-axis, so no matter which output reference in R, G, or B is increased or decreased, it will change at the same time The x value and the y value, therefore, this method can only slowly approach the color temperature point in constant measurement and comparison, which is not only time-consuming but also unable to provide a set of accurate solutions.

Another invention patent "Color Correction Circuit and Method for Liquid Crystal Display" (Taiwan Patent Publication No. 200521605)" is to establish a color selection unit with color temperature value and gamma option, and store this color selection unit in a read-only memory ROM (Read-Only Memory) provides options for multiple sets of color temperature and gamma (Gamma, the ratio of brightness to grayscale) values. After being selected by the user, a color temperature corresponding to the selected color temperature is generated through function operations. value and gamma measurement value, and then load the corrected parameter value into the parameter buffer unit to achieve the adjustment of color temperature and gamma. This correction method uses function operations, compared with the previous two invention patents ( The method of Taiwan Patent Publication No. 200532637 and Taiwan Patent No. I246319) is relatively fast, but its shortcoming is that it lacks a complete set of algorithms based on scientific theories, and whether its adjustment principle takes into account the results that may affect ( Such as the loss of brightness) is still to be confirmed, so the accuracy and effect of its adjustment results are difficult to be convincing. 

Contents of the invention

The present invention proceeds from the principle of color mixing in chromatics, uses scientific methods to adjust the color temperature, can accurately calculate various parameters in a short time, and gets rid of the previous method of relying on experience to correct the color temperature. To adjust the color temperature of the display, it is necessary to change the brightness (Brightness) ratio of R, G, and B. However, for the display itself (especially the projection display), the brightness is usually an important factor affecting the price. If you want to pursue a suitable color temperature If too much brightness is lost, then this method of adjusting color temperature will not have much value. The present invention introduces the concept of correlated color temperature. It can be seen from chromatics that, although the chromaticity coordinates of the isothermal lines of correlated color temperature are different, the human eye feels the closest to the chromaticity represented by a blackbody at this temperature. This feature is used in conjunction with color mixing Based on the principle, an algorithm is developed to adjust to a specific color temperature with the least loss of brightness. In order to achieve the above object, the method for finding a new color temperature point of the present invention comprises the following steps:

Step A: find the coordinates of a point with the highest brightness color temperature, where the coordinates of the highest brightness color temperature point refer to the coordinates on a two-dimensional scale chromaticity diagram;

Step B: providing a target isotemperature line on the two-dimensional scale chromaticity diagram; and

Step C: Calculate the coordinates of a new color temperature point, where:

The coordinates of the new color temperature point refer to the coordinates on the two-dimensional scale chromaticity diagram;

the new color temperature point is substantially on one of the target isotemperature lines; and

In the calculation of the embodiment, the new color temperature point substantially satisfies the condition that the overall brightness of red light, green light and blue light is least impaired by the color display,

Wherein the method for finding out the coordinates of this highest brightness color temperature point in step A comprises the following steps:

Find the coordinates of the three vertices of the two-dimensional scale chromaticity diagram when the color display emits the highest brightness of red light, green light and blue light respectively. and blue light vertex coordinates; and

Calculate the coordinates of the highest brightness color temperature point, wherein the coordinates of the highest brightness color temperature point are the barycenter coordinates of the three apex coordinates,

Wherein calculating the coordinates of the new color temperature point in step C comprises the following steps:

Calculate a red luminance reduction line on the two-dimensional scale chromaticity diagram, the red luminance reduction line is a line segment, and the coordinates of one end point of the red luminance reduction line are the coordinates of the highest brightness color temperature point and the other end The point coordinates are the midpoint coordinates of the line segment connecting the green light vertex and the blue light vertex, wherein the red luminance of any point on the red luminance reduction line is lower than the red luminance of the highest luminance color temperature point;

Calculate a green brightness reduction line on the two-dimensional scale chromaticity diagram, the green brightness reduction line is a line segment, and the coordinates of one end point of the green brightness reduction line are the coordinates of the highest brightness color temperature point and the other end The point coordinates are the midpoint coordinates of the line segment connecting the red light vertex and the blue light vertex, wherein the green light brightness of any point on the green light brightness reduction line is lower than the green light brightness of the highest brightness color temperature point;

Calculate a blue luminance reduction line on the two-dimensional scale chromaticity diagram, the blue luminance reduction line is a line segment, and the coordinates of one end point of the blue luminance reduction line are the coordinates of the highest brightness color temperature point and the other end The point coordinates are the midpoint coordinates of the line segment connecting the green light vertex and the red light vertex, wherein the blue light brightness of any point on the blue light brightness reduction line is lower than the blue light brightness of the highest brightness color temperature point; and

Calculate the coordinates of the new color temperature point, wherein the new color temperature point is the intersection point formed by the target iso-color temperature line and the red light brightness reduction line, the green light brightness reduction line and the blue light brightness reduction line. In the state of reducing the overall brightness the least, it means that the brightness of only one of the red light, the green light and the blue light is substantially reduced. the

The method of the present invention can be applied to a device for finding a new color temperature point, and the device for finding a new color temperature point includes a signal generator, a light sensor, a color analyzer and a computer. The computer includes a processor and a memory, and the memory includes a computer software for the processor to execute to achieve the above-mentioned steps A-C. the

Description of drawings

FIG. 1 shows a schematic diagram of a two-dimensional scale chromaticity diagram where red, green and blue light vertex coordinates are located. the

FIG. 2 is a schematic diagram of the usage environment of the device for finding a new color temperature point according to the present invention. the

FIG. 3 shows a schematic diagram of the highest brightness color temperature point. the

FIG. 4 shows a schematic diagram when the brightness loss is controlled in a small range. the

FIG. 5 shows a schematic diagram when the brightness loss is controlled in a larger range. the

Fig. 6 is a flow chart of the present invention about finding a new color temperature point. the

FIG. 7 shows a schematic diagram of target isotemperature lines on a two-dimensional scale chromaticity diagram. the

Fig. 8 shows a schematic diagram of new color temperature points. the

Description of reference symbols

Coordinates of the highest brightness color temperature point (x _w , y _w )

Maximum brightness color temperature point W

Coordinates of new color temperature point W _n new color temperature point (x _wn , y _wn )

Two-dimensional scale chromaticity diagram 20 Color representation area 21

Target isochromatic temperature line 30

Red light vertex coordinates R(x _r , y _r ) Green light vertex coordinates G(x _g , y _g )

Blue light vertex coordinates B(x _b , y _b ) Color gamut boundary T _S , T _L , T _N

Device for finding a new color temperature point 70 Light sensor 71

Color Analyzer 72 Computer 73

Signal generator 74 Color display 90

Detailed ways

1 shows a schematic diagram of a two-dimensional scale chromaticity diagram 20. The most commonly used two-dimensional scale chromaticity diagram 20 is the CIE chromaticity diagram, which uses two-dimensional coordinates (such as x, y coordinates) to describe colors, and The color representation area 21 displays various colors. the

Figure 1 shows the chromaticity coordinates of a color display when it is pure red (R), pure green (G), pure blue (B) and it is the brightest picture, which are respectively defined as red light vertex coordinates R(x _r , y _r ), the green light vertex coordinates G(x _g , y _g ) and the blue light vertex coordinates B(x _b , y _b ). The color display is, for example, a computer or television screen, and the types of the display are, for example, a picture tube display, an LED display, a projection display, and the like.

FIG. 2 is a schematic diagram of the usage environment of the device for finding a new color temperature point according to the present invention. The device 70 for finding a new color temperature point includes a light sensor 71 , a color analyzer 72 , a computer 73 and a signal generator 74 . The signal generator 74 is used to generate a specific graphic input color display 90, and after the image of the color display 90 is captured by the light sensor 71, the color analyzer 72 can measure the color information of the color display 90 (such as including the color temperature of each gray scale). , luminance and chromaticity) and pass these data to computer 73 to do computing. The computer 73 loads the calculation result of the maximum brightness-related color temperature algorithm into the look-up table (LUT, Look Up Table) of the color display 90, so that the color temperature and gamma of the color display 90 are changed. Since the light sensor 71, the color analyzer 72, the computer 73 (comprising a processor 731 and a memory 732) and the signal generator 74 are all known hardware devices, the structure of these hardware devices will not be described in detail below, but mainly for The focus of the present invention is to give a detailed description of the operation of the maximum brightness correlated color temperature algorithm. the

Generally, the color temperature of the color display 90 is defined as the value measured by the color analyzer 72 after the image of the color display 90 is captured by the light sensor 71 when the screen is completely white. Full white refers to the color mixed from any three colors of R, G, and B with the same gray scale. However, since the display is easily affected by light leakage at low brightness, the color temperature will deviate. Therefore, it is usually necessary to measure the color temperature of the screen. When the three colors of R, G, and B are adjusted to be the brightest, the all-white picture is mixed. Therefore, the chromaticity coordinates R(x _r , y _r ), G(x _g , y _g ) and B(x _b , y _b ) of the three colors R, G, and B when they are the brightest respectively can be obtained by measurement; in addition, R, The respective maximum luminances Y _r , Y _g , and Y _b of the three colors G and B (which is a hypothetical parameter, not shown in the figure) can also be measured separately.

The following description of FIGS. 3-5 is used to explain the basic background principle of the technology of the present invention. In addition, in order to simplify the drawing, the X and Y axes of the two-dimensional scale chromaticity diagram 20 and the color representation area 21 on the two-dimensional scale chromaticity diagram 20 are not drawn in the following FIGS. 3-5 and FIGS. 7-8 . the

FIG. 3 shows a schematic diagram of the color temperature point W of the highest brightness. In the CIE chromaticity space, each point represents a different chromaticity, and the chromaticity displayed by any two lights of different chromaticity must be at a certain point on the line between the two points, which is similar to physics. The center of gravity of learning. As explained in Figure 3, the three points D, E, and F are the centers of gravity of the BR line segment, RG line segment, and GB line segment respectively, and the three barycenter lines of RF, GD, and BE will intersect at a point W. Since the three colors of R, G, and B are different The coordinates of the brightest point are R(x _r , y _r ), G(x _g , y _g ) and B(x _b , y _b ), so point W represents the highest brightness color temperature point (x _w , y _w ).

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

${\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}<span\; class="notranslate">\; =</span>\frac{\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

From formula 1 and formula 2, we can get

$<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

make $\left(\frac{x_w-x_r}{{\mathrm{the\; y}}_r}\right)=A,\left(\frac{x_w-x_g}{{\mathrm{the\; y}}_g}\right)=B,\left(\frac{x_w-x_b}{{\mathrm{the\; y}}_b}\right)=C,$

$<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}$

Formulas 3 and 4 can be written as:

AY _r +BY _g +CY _b = 0 ……………(5)

DY _r +EY _g +FY _b ＝0 ……………(6)

Combine F×(5)-C×(6) and get

$\frac{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; Facebook</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; CE</span>}}{\mathrm{<span\; class="notranslate">\; cd</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; FA</span>}}$

${\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; =</span>\left|\begin{array}{cc}\mathrm{<span\; class="notranslate">\; B</span>}& \mathrm{<span\; class="notranslate">\; C</span>}\\ \mathrm{<span\; class="notranslate">\; E.</span>}& \mathrm{<span\; class="notranslate">\; f</span>}\end{array}\right|<span\; class="notranslate">\; :</span>\left|\begin{array}{cc}\mathrm{<span\; class="notranslate">\; C</span>}& \mathrm{<span\; class="notranslate">\; A</span>}\\ \mathrm{<span\; class="notranslate">\; f</span>}& \mathrm{<span\; class="notranslate">\; D.</span>}\end{array}\right|<span\; class="notranslate">\; =</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}\end{array}\right|<span\; class="notranslate">\; :</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}\end{array}\right|$

Similarly, it can be deduced

${\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}\end{array}\right|<span\; class="notranslate">\; :</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}\end{array}\right|$

That is to say, without changing the R, G, B chromaticity coordinates, if you want to adjust the color temperature to a specific white point (referring to W(x _w , y _w ) here), you must adjust the R, G, B Brightness to Scale of

${\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}\end{array}\right|<span\; class="notranslate">\; :</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}\end{array}\right|<span\; class="notranslate">\; :</span>\left|\begin{array}{cc}\frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}\\ \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}& \frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}\end{array}\right|<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

For the color display 90, we don't want to sacrifice too much brightness due to adjusting the color temperature, so we need to find a way to sacrifice the least brightness. The method is as follows: the maximum brightness Y _r , Y _g , and Y b of R, G, and _B of the color display 90 itself are separately adjusted to the brightness ratio Y _rnew , Y _gnew , and Y _bnew required for a new target color temperature to obtain $a_r=\frac{Y_r}{Y_{\mathrm{rnew}}},$ $a_g=\frac{Y_g}{Y_{\mathrm{gnew}}},$ $a_b=\frac{Y_b}{Y_{\mathrm{bnew}}}$

Take the smallest value among a _r , a _g , a _b , which means it reaches the brightness limit at the earliest during the adjustment process, assuming the minimum value is a _min = min( _ar , a _g , a _b ), and then multiply this value back to Y _rnew , Y _gnew , Y _bnew get

Y _{r_tuned} = a _min Y _rnew

Y _{g_tuned} = a _min Y _gnew

Y _{b_tuned} = a _min Y _bnew

The adjusted brightness is the brightness required by each color after adjusting to the target color temperature. the

A set of R, G, and B brightness ratios corresponds to a color temperature point, then reducing the total brightness, that is, giving a tolerance value for R, G, and B to adjust, can obtain many different color temperature points. A color gamut boundary T _S can be calculated according to the color mixing principle, as shown in FIG. 4 . This color gamut boundary T _s represents the range of color temperature points that can be expressed by arbitrarily adjusting the brightness of R, G, and B when the loss of brightness does not exceed a certain tolerance value, and this color gamut boundary T _s will be a three-vertex respectively located in three The triangle formed by the center of gravity line (RF, GD, BE).

If the total brightness is reduced more, as shown in Figure 5, the color gamut boundary T _L will be larger.

The above description is the theoretical basis derived from the technology of the present invention. Please refer to FIG. 6 below for the flow chart of finding a new color temperature point in the present invention. the

Step 601:

Find the coordinates of a color temperature point W with the highest brightness, wherein the coordinates of the color temperature point W with the highest brightness refer to the coordinates on a two-dimensional scale chromaticity diagram 20 . Step 601 is to find the coordinates (x _w , y _w ) of the above-mentioned point W with the highest brightness color temperature: R(x _r , y _r ), G(x _g , y _g ) and B(x _b , y _b ).

This step is as described in Figure 2 above. The coordinates (x _w , y _w ) of the highest brightness color temperature point W and the respective maximum brightness Y _r , Y _g , and Y b of the three colors R, G, and _B can be obtained by finding a new color temperature point. The light sensor 71 and the color analyzer 72 of the device 70 obtain it.

Step 602:

A target isotemperature line 30 is provided on the two-dimensional scale chromaticity diagram 20 . Please refer to Figure 7. The target iso-color temperature line 30 is mainly based on market demand. For example, Asians prefer warm colors, while Europeans prefer cool colors. Therefore, different color temperature corrections should be made for users in different countries. the

Step 603:

Calculate the coordinates (x _wn , y _wn ) of a new color temperature point W _n .

With the target iso-color temperature line 30, in fact, a color gamut boundary T _N with the least loss of brightness can be found, and the new color temperature point W _n will be on one point of the target iso-color temperature line, since the minimum loss of brightness must be satisfied, The color gamut boundary T _N with the least loss of brightness is to find the smallest triangle, so in essence the new color temperature point W _n will fall on the vertex of the triangle of the color gamut boundary T _N.

As explained above, the color gamut boundary _TN will be a triangle formed by three vertices respectively located on the three barycentric lines (RF, GD, BE). , BE) is the new color temperature point W _n ;

It should be noted that there is another intersection point W _e between the target iso-color temperature line 30 and the three barycenter lines, but the intersection point W _e is not within the color gamut boundary _TN , so the intersection point W _e is not a new color temperature point. So a more correct description would be as follows:

The intersection point formed by the target isocolor temperature line 30 and the red luminance reduction line WF, the green luminance reduction line WD and the blue luminance reduction line WE is the new color temperature point W _n ;

Red light brightness reduction line WF is the line segment from the highest brightness color temperature point W to point F;

The green luminance reduction line WD is a line segment from the highest luminance color temperature point W to point D; and

The blue luminance reduction line WE is a line segment from the highest luminance color temperature point W to point E. the

In order to obtain the new color temperature point W _n , mathematics is very simple in terms of operation. The representative formulas of red, green and blue luminance reduction lines WF, WD and WE can be calculated first, and the formulas of the target isocolor temperature line 30 can be obtained (or describe The coordinate point of the target iso-color temperature line 30 ) can calculate the new color temperature point W _n . Since line segment and intersection operations are basic mathematics (refer to high school mathematics textbooks), the mathematical operations will not be repeated here.

The above steps need to be calculated or data provided or recorded can be completed by the computer 73 of the device 70 of the new color temperature point. the

It should be noted that although the principle of "color gamut boundary" is mentioned above, in fact, the method of the present invention for finding a new color temperature point does not need to calculate the triangle of "color gamut boundary", but calculates in the manner of step 603 faster. the

In addition, it should be noted that the coordinates (x _wn , y _wn ) of the new color temperature point found in the above steps are the optimal solution with the least loss of brightness, but it is also possible to use this optimal solution to find the second best solution for the coordinates of nearby color temperature points. The scope protected by this patent.

To sum up, the present invention shows its characteristics that are very different from the prior art in terms of purpose, means and effect. It should be noted that the above-mentioned embodiments are only examples for convenience of description, and the protection scope of the present invention should be determined by the claims of the present invention, rather than being limited to the above-mentioned embodiments. the

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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