WO2017101534A1

WO2017101534A1 - Colour signal conversion method and device for liquid crystal display screen

Info

Publication number: WO2017101534A1
Application number: PCT/CN2016/098789
Authority: WO
Inventors: 宁超; 曹谦; 苏文华; 姚键; 潘柏宇; 王冀
Original assignee: 合一智能科技（深圳）有限公司
Priority date: 2015-12-14
Filing date: 2016-09-13
Publication date: 2017-06-22
Also published as: CN105472364A; CN105472364B

Abstract

The present invention relates to a colour signal conversion method and device for a liquid crystal display screen. The method comprises: comparing the sizes of grey scale values of an R signal, a G signal and a B signal in an input RGB signal; and where the grey scale value of the B signal in the RGB signal is the minimum and the grey scale value of the R signal is larger than the grey scale value of the G signal, converting the RGB signal into a first RGBY signal, and outputting the first RGBY signal, wherein a grey scale value of a Y signal in the first RGBY signal is the grey scale value of the G signal in the RGB signal, a grey scale value of a G signal in the first RGBY signal is the minimum grey scale value, a grey scale value of a B signal in the first RGBY signal is the grey scale value of the B signal in the RGB signal, and a grey scale value of an R signal in the first RGBY signal is determined according to the grey scale value of the R signal in the RGB signal, the grey scale value of the Y signal in the first RGBY signal, the maximum grey scale value and a pre-set brightness curve gamma value. According to the present invention, the colour of a converted colour signal can be brighter.

Description

Color signal conversion method and device for liquid crystal display

cross reference

The present application claims priority to Chinese Patent Application No. 20151092503, filed on Dec. 14, 2015, which is hereby incorporated by reference.

Technical field

The present invention relates to the field of liquid crystal display, and in particular, to a color signal conversion method and device for a liquid crystal display.

Background technique

In the current mainstream display devices, the pixels of LCD (English: Liquid Crystal Display, Chinese: LCD panel) and OLED (English: Organic Light-Emitting Diode, Chinese: organic electroluminescent display panel) are generally RGB (red, Green, blue) composed of three sub-pixels, however, there are gradually four panels of RGBY (red, green, blue, yellow) four sub-pixels. Thanks to the Y (yellow) signal, the yellow and gold signals are obtained. Better reproduction, the skin color picture that appears more frequently in the video will be closer to the real world color, and the yellow color of the blue complementary color will be enhanced, and the expression of blue will also be improved.

In general, pixel signals transmitted by signal transmission interfaces such as VGA (English: Video Graphics Array), DVI (English: Digital Visual Interface), etc. are all RGB signals. Applying RGB signals directly to an RGBY display can cause image distortion, so it is necessary to convert the RGB signals that are connected to the RGBY display. In the conventional RGB signal conversion method, when the input color is not yellow, the color of the converted RGB signal may not be bright enough, and in the case where the input color is yellow, the yellow color of the converted RGBY signal may not be enough. Bright.

Summary of the invention

technical problem

In view of this, the technical problem to be solved by the present invention is how to convert the RGB signals so that the color of the converted color signals is more vivid.

solution

In order to solve the above technical problem, according to an aspect of the present invention, a color signal conversion method for a liquid crystal display panel is provided, including:

Comparing the magnitudes of the grayscale values of the R signal, the G signal, and the B signal in the input RGB signal;

Comparing the magnitudes of the grayscale values of the R signal and the G signal in the RGB signal in a case where the grayscale value of the B signal in the RGB signal is the smallest;

In a case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, converting the RGB signal into a first RGBY signal and outputting the first RGBY signal,

The grayscale value of the Y signal in the first RGBY signal is a grayscale value of the G signal in the RGB signal,

The gray scale value of the G signal in the first RGBY signal is a minimum gray scale value,

The grayscale value of the B signal in the first RGBY signal is a grayscale value of the B signal in the RGB signal,

a grayscale value of the R signal in the first RGBY signal according to a grayscale value of the R signal in the RGB signal, a grayscale value of the Y signal in the first RGBY signal, a maximum grayscale value, and a predetermined The brightness curve gamma value is determined.

For the above color signal conversion method, in a possible implementation manner, the method further includes:

In a case where the grayscale value of the R signal in the RGB signal is less than or equal to the grayscale value of the G signal, converting the RGB signal into a second RGBY signal and outputting the second RGBY signal,

Wherein the gray level value of the Y signal in the second RGBY signal is R in the RGB signal The grayscale value of the signal,

The gray level value of the R signal in the second RGBY signal is a minimum gray scale value,

The grayscale value of the B signal in the second RGBY signal is a grayscale value of the B signal in the RGB signal,

a grayscale value of the G signal in the second RGBY signal according to a grayscale value of the G signal in the RGB signal, a grayscale value of the Y signal in the second RGBY signal, a maximum grayscale value, and the The predetermined brightness curve gamma value is determined.

For the above color signal conversion method, in a possible implementation manner, in a case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, the first is calculated according to the following formula 1 The grayscale value of the R signal in the RGBY signal,

Wherein R ₂ is a grayscale value of the R signal in the first RGBY signal, N is a maximum grayscale value, R ₁ is a grayscale value of the R signal in the RGB signal, and Y ₂ is the first The gray scale value of the Y signal in the RGBY signal, γ is a predetermined luminance curve gamma value.

For the above color signal conversion method, in a possible implementation manner, in a case where the grayscale value of the R signal in the RGB signal is less than or equal to the grayscale value of the G signal, the calculation is performed according to the following formula 2 The grayscale value of the G signal in the second RGBY signal,

Wherein G ₂ is a grayscale value of a G signal in the second RGBY signal, N is a maximum grayscale value, G ₁ is a grayscale value of a G signal in the RGB signal, and Y ₂ is the second The gray scale value of the Y signal in the RGBY signal, γ is a predetermined luminance curve gamma value.

In a possible implementation manner, the method further includes:

In a case where the grayscale value of the B signal in the RGB signal is not the smallest, the RGB signal is converted into a third RGBY signal and the third RGBY signal is output,

The converting the RGB signal into a third RGBY signal and outputting the third RGBY signal includes:

Enhancing the relative saturation of the RGB signals;

Obtaining a corresponding point D2 in the RGB triangle according to the improved relative saturation of the RGB signal and the length of the line segment OD in the RGB triangle, the RGB triangle being used to represent the color gamut range of the liquid crystal display ;as well as

Outputting the third RGBY signal according to chromaticity coordinates of D2, wherein a grayscale value of the Y signal in the third RGBY signal is a minimum grayscale value,

Wherein, in the RGB triangle, the O point is determined by reference white point coordinates, the D1 point is a point corresponding to the RGB signal in the RGB triangle, and the D point is an intersection of the ray OD1 and the RGB triangle.

For the color signal conversion method described above, in a possible implementation, the corresponding point D2 of the third RGBY signal in the RGB triangle is obtained according to the following formula 3,

OD2=OD*S1 Equation 3

Where OD2 is the length of the line segment OD2, OD is the length of the line segment OD, and S1 is the relative saturation after the lifting.

In order to solve the above technical problem, according to another aspect of the present invention, a color signal conversion device for a liquid crystal display panel is provided, including:

a comparing unit for comparing a magnitude of a grayscale value of the R signal, the G signal, and the B signal in the input RGB signal;

And a conversion output unit, connected to the comparison unit, wherein a comparison result of the comparison unit is that a grayscale value of a B signal in the RGB signal is minimum and a grayscale value of the R signal is greater than a grayscale value of the G signal In the case, converting the RGB signal into a first RGBY signal and outputting the first RGBY signal,

In a possible implementation manner, the conversion output unit is further configured to: when the comparison result of the comparison unit is that the gray level value of the B signal in the RGB signal is the smallest and the R signal is When the grayscale value is less than or equal to the grayscale value of the G signal, converting the RGB signal into a second RGBY signal and outputting the second RGBY signal,

The grayscale value of the Y signal in the second RGBY signal is a grayscale value of the R signal in the RGB signal,

For the above color signal conversion device, in a possible implementation manner, in a case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, the conversion output unit is according to the following formula 1 Calculating a grayscale value of the R signal in the first RGBY signal,

For the above color signal conversion device, in a possible implementation manner, in a case where the grayscale value of the R signal in the RGB signal is less than or equal to the grayscale value of the G signal, the conversion output unit is according to the following formula 2 calculating a gray scale value of the G signal in the second RGBY signal,

In a possible implementation manner, the conversion output unit is further configured to: when the comparison result of the comparison unit is that the gray level value of the B signal in the RGB signal is not the minimum Converting the RGB signal into a third RGBY signal and outputting the third RGBY signal,

Enhancing the relative saturation of the RGB signals;

In a possible implementation manner, the conversion output unit acquires a corresponding point D2 of the third RGBY signal in the RGB triangle according to the following formula 3,

OD2=OD*S1 Equation 3

Beneficial effect

A color signal conversion method and apparatus for a liquid crystal display according to an embodiment of the present invention can convert an original RGB signal into an RGBY signal. When the input color is yellow, an RGBY signal that makes the yellow color more vivid can be output, and when the input color is not yellow, an RGB signal that makes the colors of other colors more vivid can be output. Thus, the color signal conversion method and apparatus according to the embodiment of the present invention can make the color of the converted color signal more vivid.

Further features and aspects of the present invention will become apparent from the Detailed Description of the Drawing.

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a flow chart showing a color signal conversion method of a liquid crystal display according to an embodiment of the present invention;

2 is a flow chart showing a color signal conversion method of a liquid crystal display according to another embodiment of the present invention;

3 illustrates a schematic diagram of determining chromaticity coordinate points of a new RGB signal from chromaticity coordinate points of original RGB signals, in accordance with an embodiment of the present invention;

4 shows a specific example of a color signal conversion method when the input color is not yellow in the embodiment of the present invention;

Figure 5 shows a schematic diagram of a sinusoidal function as a function of increasing the relative saturation of RGB signals;

6 is a block diagram showing the structure of a color signal conversion device of a liquid crystal display according to an embodiment of the present invention;

FIG. 7 is a block diagram showing the structure of a color signal conversion device of a liquid crystal display according to an embodiment of the present invention.

Detailed ways

Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the drawings. The same reference numerals in the drawings denote the same or similar elements. Although the various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustrative." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or preferred.

In addition, numerous specific details are set forth in the Detailed Description of the invention in the Detailed Description. Those skilled in the art will appreciate that the invention may be practiced without some specific details. In some instances, methods, means, components, and circuits that are well known to those skilled in the art are not described in detail in order to facilitate the invention.

Example 1

1 is a flow chart showing a color signal conversion method of a liquid crystal display according to an embodiment of the present invention. As shown in FIG. 1 , the color signal conversion method may mainly include the following steps S100 to S130.

Step S100: Compare the magnitudes of the grayscale values of the R signal, the G signal, and the B signal in the input RGB signals.

Specifically, the original RGB signal transmitted in a VGA interface, a DVI interface or the like is first input to the color signal conversion device of the present invention, and then the color signal conversion device compares the R signal and the G signal in the input RGB signal. And the size of the grayscale value of the B signal. Wherein, in a possible implementation manner, the minimum grayscale value of the R signal, the G signal, and the B signal in the RGB signal is 0, and the maximum grayscale value is 255. In other words, the grayscale values of the R signal, the G signal, and the B signal are all in the range of 0 to 255.

Step S110: Comparing the grayscale values of the R signal and the G signal in the RGB signal in a case where the grayscale value of the B signal in the RGB signal is the smallest;

Step S120: In a case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, the RGB signal is converted into the first RGBY signal and the first RGBY signal is output.

The grayscale value of the Y signal in the first RGBY signal is a grayscale value of the G signal in the RGB signal, and the grayscale value of the G signal in the first RGBY signal is a minimum grayscale value. a grayscale value of a B signal in the first RGBY signal is a grayscale value of a B signal in the RGB signal, and a grayscale value of an R signal in the first RGBY signal is based on an R in the RGB signal A grayscale value of the signal, a grayscale value of the Y signal in the first RGBY signal, a maximum grayscale value, and a predetermined luminance curve gamma value are determined.

For example, in the input RGB signal, the grayscale values of the R signal, the G signal, and the B signal are 150, 100, and 50, respectively, and in the above step S100, it is determined that the gray level of the B signal in the RGB signal is The grayscale value of the value is the smallest. Then, in the above step S110, it is determined that the grayscale value of the R signal is larger than the G signal. At this time, in step S120, the input RGB signal is converted into a first RGBY signal and the first RGBY signal is output. Wherein, in the RGBY signal, the grayscale value of the Y signal is a grayscale value of the G signal in the input RGB signal, that is, 100, and the grayscale value of the G signal is a minimum grayscale value, that is, 0, B The grayscale value of the signal remains unchanged, that is, still 50. The grayscale value of the R signal can be based on the grayscale value of the R signal in the input RGB signal, the grayscale value of the Y signal in the first RGBY signal, and the maximum value. The gray scale value and the predetermined luminance curve gamma value are determined. In a possible implementation, pre The set luminance curve has a gamma value of 2.2.

Thus, through the above step S120, the color signal conversion device can convert the input original RGB signal into an RGBY signal and output it to the RGBY display screen to display the color corresponding to the converted signal.

With the above color signal conversion method of the embodiment of the present invention, the original RGB signal can be converted into an RGBY signal. Also, by the above-described color signal conversion method, the R signal of the converted RGBY signal can be better reflected, and the yellow color is enhanced, so that the color of the output RGBY signal is more vivid.

In a possible implementation manner, the color signal conversion method of the embodiment of the present invention may further include step S130.

Step S130: In a case where the grayscale value of the R signal in the RGB signal is less than or equal to the grayscale value of the G signal, the RGB signal is converted into the second RGBY signal and the second RGBY is output.

The grayscale value of the Y signal in the second RGBY signal is a grayscale value of the R signal in the RGB signal, and the grayscale value of the R signal in the second RGBY signal is a minimum grayscale value, and the second RGBY The grayscale value of the B signal in the signal is a grayscale value of the B signal in the RGB signal, and the grayscale value of the G signal in the second RGBY signal is based on a grayscale value of the G signal in the RGB signal, the second RGBY The grayscale value of the Y signal in the signal, the maximum grayscale value, and a predetermined luminance curve gamma value are determined.

For example, in the input RGB signal, the grayscale values of the R signal, the G signal, and the B signal are 100, 150, and 50, respectively, and in the above step S100, it is determined that the gray scale of the B signal in the RGB signal is The grayscale value of the value is the smallest. Then, in the above step S110, it is determined that the grayscale value of the R signal is smaller than the G signal. At this time, in step S130, the input RGB signal is converted into a second RGBY signal. Wherein, in the second RGBY signal, the grayscale value of the Y signal is a grayscale value of the R signal in the input RGB signal, that is, 100, and the grayscale value of the R signal is a minimum grayscale value, that is, 0. The grayscale value of the B signal remains unchanged, that is, still 50. The grayscale value of the G signal may be based on the grayscale value of the G signal in the input RGB signal, and the grayscale of the Y signal in the second RGBY signal. Value, maximum grayscale value, and The predetermined brightness curve gamma value is determined. In a possible implementation manner, the predetermined luminance curve gamma value is the same as the predetermined luminance curve gamma value in the above embodiment, and is also 2.2.

Thus, through the above step S130, the color signal conversion device can convert the input original RGB signal into an RGBY signal and output it to the RGBY display screen to display the color corresponding to the converted signal.

The original RGB signal can be converted into an RGBY signal by the color signal conversion method in the above embodiment. And, by the above-described color signal conversion method, the G signal of the converted RGBY signal can be better reflected, and the yellow color is enhanced, so that the color of the output RGBY signal is more vivid.

According to the color signal conversion method of the embodiment of the present invention, in the input RGB signal, when the grayscale value of the B signal is the smallest, it can be determined that the input color is yellow. In this case, the magnitudes of the grayscale values of the R signal and the G signal in the RGB signals are compared, and then the R signal or the G signal is better embodied by the step S120 or S130 in the above color signal conversion method. If it is determined that the grayscale value of the R signal is greater than the grayscale value of the G signal, the R signal is better embodied by the above step S120; otherwise, the G signal is better embodied by the above step S130. By the above color signal conversion method, the color of yellow can be enhanced, so that the color of the RGBY signal is more vivid.

Example 2

The difference between this embodiment and the first embodiment is mainly that, in the above step S120, in the case that the grayscale value of the R signal in the input RGB signal is greater than the grayscale value of the G signal, the following formula 1 may be specifically To calculate the grayscale value of the R signal in the first RGBY signal,

Where R ₂ is the gray scale value of the R signal in the first RGBY signal, N is the maximum gray scale value, for example, 255, R ₁ is the gray scale value of the R signal in the input RGB signal, and Y ₂ is the first The gray scale value of the Y signal in an RGBY signal, γ is a predetermined luminance curve gamma value, for example, γ=2.2.

With the above color signal conversion method of the embodiment of the present invention, the original RGB signal can be converted into an RGBY signal. Moreover, by the color signal conversion method described above, the color of the R signal in the converted RGBY signal is enhanced, that is, the colors of colors other than yellow are enhanced, so that all colors are more vivid and balanced.

In a possible implementation manner, in the foregoing step S140, in a case where the grayscale value of the R signal in the input RGB signal is less than or equal to the grayscale value of the G signal, the calculation may be specifically performed according to the following formula 2 The grayscale value of the G signal in the second RGBY signal,

Where G ₂ is the grayscale value of the G signal in the second RGBY signal, N is the maximum grayscale value, for example, 255, G ₁ is the grayscale value of the G signal in the input RGB signal, and Y ₂ is the first The gray scale value of the Y signal in the two RGBY signals, γ is a predetermined luminance curve gamma value, for example, γ=2.2.

The original RGB signal can be converted into an RGBY signal by the color signal conversion method in the above embodiment. Moreover, the R signal or the G signal can be better embodied, and the color of the yellow color is enhanced, so that the color of the RGBY signal is more vivid.

Example 3

2 is a flow chart showing a color signal conversion method of a liquid crystal display according to another embodiment of the present invention. The steps in FIG. 2 having the same reference numerals as in FIG. 1 have the same functions, and a detailed description of these steps will be omitted for the sake of brevity.

As shown in FIG. 2, the main difference between the color signal conversion method shown in FIG. 2 and the color signal conversion method shown in FIG. 1 is that if the B signal in the input RGB signal is not the smallest, it can be judged as If the color of the input signal is not yellow, it is not necessary to activate the Y pixel. In this case, the Y signal can be made the minimum grayscale value, and the color enhancement is performed according to the following step S200 (including steps S2010 to S2030).

In other words, in the color signal conversion method of the embodiment of the present invention, in addition to the steps S100 to S130 in the above embodiment, the following step S200 may be further included (including steps S2010 to S2030).

Step S200: In a case where the grayscale value of the B signal in the input RGB signal is not the smallest, the input RGB signal is converted into a third RGBY signal and the third RGBY signal is output.

The above step S200 may mainly include the following steps:

Step S2010, improving the relative saturation of the input RGB signal;

Step S2020: Acquire a corresponding point D2 in the RGB triangle according to the increased relative saturation of the input RGB signal and the length of the line segment OD in the RGB triangle, wherein, as shown in FIG. 3, the RGB triangle is used for Represents the color gamut range of the LCD, wherein, in the RGB triangle, the O point is determined by the reference white point coordinate, the D1 point is the corresponding point of the input RGB signal in the RGB triangle, and the OD1 is connected, and the OD1 direction extended line segment OD1 is extended. To form the ray OD1, the intersection of the ray OD1 and the RGB triangle is D;

Step S2030, outputting a third RGBY signal according to the chromaticity coordinates of D2, wherein the grayscale value of the Y signal in the third RGBY signal is a minimum grayscale value.

With the above color signal conversion method of the present embodiment, in a case where the grayscale value of the B signal in the input RGB signal is not the smallest, that is, the input color is not yellow, the input RGB is first determined in the RGB triangle. The signal corresponds to the chromaticity point D1, and increases the relative saturation of the input RGB signal, and then acquires a new chromaticity point D2 according to the relative saturation after the lifting and the length of the line segment OD. Thus, the new chromaticity point D2 is the same as the hue H of the original chromaticity point D1, except that the relative saturation of the new chromaticity point D2 with respect to the original chromaticity point D1 is improved. Then, some RGB combinations are found based on the new chrominance point D2 such that their chromaticity coordinates are D2 points in the RGB triangle. Finally, the final output RGBY signal is determined based on the principle that the brightness is closest to the brightness of the original RGB signal.

By the above color signal conversion method, it is possible to make the input color not yellow Under, make all colors more vivid and balanced.

In a possible implementation manner, in the foregoing step S2020, the corresponding point D2 of the third RGBY signal in the RGB triangle may be acquired according to the following formula 3,

OD2=OD*S1 Equation 3

FIG. 4 shows a specific example of a color signal conversion method when the input color is not yellow in the embodiment of the present invention. As shown in FIG. 4, the color signal conversion method may mainly include the following steps.

(1) Measure the XYZ of the LCD RGB signal using the color analyzer CA310 or other instruments, and calculate the chromaticity (x, y) and brightness Y of the input arbitrary RGB signal according to the linear superposition principle of light (Figure 4). Steps S300, S310). Specifically, according to the principle of linear superposition of light, XYZ of an arbitrary RGB signal can be obtained by the formula: X=Xr+Xg+Xb, Y=Yr+Yg+Yb, Z=Zr+Zg+Zb. Then, according to the colorimetric formula x=X/(X+Y+Z), y=Y/(X+Y+Z), the corresponding chromaticity value, that is, the chromaticity coordinate can be calculated. In this way, the chromaticity (x, y) and the luminance Y corresponding to the entire color of the LCD display can be calculated. Here, the grayscale value range of the R signal, the G signal, and the B signal in the RGB signal may all be 0 to 255, that is, the minimum grayscale value is 0, and the maximum grayscale value is 255. In other words, for an 8-bit LCD, there are 255 ³ RGB combinations and colors.

(2) Based on the above chromaticity data, the relative saturation S of the RGB signal of any input can be calculated (step S320 shown in Fig. 4).

Specifically, according to the RGB measured from the minimum grayscale value to the maximum grayscale value, that is, the chromaticity value of 0 to 255 steps measured in the step (1), the color gamut range indicating the LCD can be obtained as shown in FIG. Triangle (hereinafter referred to as RGB triangle).

According to the step (1), the chromaticity values of the arbitrary RGB combinations can be calculated, and the points corresponding to the chromaticity values in the RGB triangles can be determined based on the calculated chromaticity values of the RGB combinations. Taking the RGB signal to be converted as an example, the chrominance value can be calculated first, and then the color is determined. The point corresponding to the degree value is D1 as shown in FIG. Here, as shown in FIG. 3, in the RGB triangle, the chromaticity point corresponding to RGB=(255, 255, 255) is 0. The OD1 is connected, and the line segment OD1 is extended in the OD1 direction to obtain the ray OD1. Further, a point at which the ray OD1 intersects with the side of the RGB triangle may be set to D.

Thereby, the relative saturation S = OD1/OD of the RGB signal can be calculated, wherein OD1, OD represent the lengths of the line segments OD1 and OD, respectively.

(3) The saturation S is converted using a sine function S1 = sin (S * pi / 2) (step S330 shown in Fig. 4), where pi = π.

Specifically, for the relative saturation S obtained in the step (2), in a possible implementation, the sine function S1=sin(S*pi/2) can be used for appropriate stretching to enhance RGB. The relative saturation of the signal. Since S is in the range of (0, 1) and the sin function changes nonlinearly within (0, pi/2), S1 increases as S increases. In this way, a new relative saturation S1 of the RGB signal can be obtained, and a smooth transition of the RGB signal can be ensured without oversaturation. The sinusoidal function diagram for saturation stretching can be roughly as shown in FIG.

With the above sinusoidal function, the relative saturation of the RGB signals can be appropriately increased. When the saturation of the RGB signal itself is higher, the degree of improvement can be made smaller and smaller. This avoids the occurrence of oversaturation and ribbon or color patches.

The above sinusoidal function is taken as an example to illustrate the improvement of the relative saturation of RGB signals. In a possible implementation, other functions may also be used to enhance the relative saturation of the RGB signal as long as the function satisfies the relative saturation of the RGB signal and the function is in the range of (0, 1). It can be changed linearly inward. For example, the relative saturation S of the RGB signal can also be multiplied by a number greater than one.

(4) The hue H is kept constant, and the chromaticity coordinate D2 of the new chromaticity point is calculated based on the new relative saturation S1 (step S340 shown in Fig. 4).

Specifically, according to the saturation S1 obtained in the step (3) and the RGB triangle in the step (2) The length of the line segment OD is used to determine the new chromaticity point D2 after the relative saturation is increased. For example, the length of the line segment OD2 can be determined by using the above formula 3, thereby determining the new chromaticity point D2 after the relative saturation is increased. As shown in FIG. 3, the new chromaticity point D2 is the same as the hue H of the original chromaticity point D1, except that the saturation is changed, that is, the relative saturation of the new chromaticity point D2 relative to the original chromaticity point D1 is improved. .

(5) According to the coordinates of D2 and the original measurement data, find some RGB combinations so that their chromaticity coordinates are at point D2, and then determine the final output RGB signal Y according to the principle that the brightness is closest to the original RGB brightness (where The gray scale value of Y is the minimum gray scale value) signal (step S350 shown in FIG. 4).

It should be noted that the above-described color signal conversion method has been described with the chromaticity point D1. Those skilled in the art can know that, by using the above-described color signal conversion method, it is possible to convert chromaticity points corresponding to arbitrary RGB signals to RGB signals which are increased in relative saturation but have a constant hue H.

By the color signal conversion method as described above, it is possible to enhance the color of the RGB signal in the case where the input color is not yellow, so that the color of the output RGB signal is more vivid.

It should be noted that, in the above embodiment, the present invention has been described with the gray scale value of the RGB signal ranging from 0 to 255. Those skilled in the art can know that the gray scale value range of the RGB signal can be other ranges. Further, in the above embodiment, the present invention has been described with a predetermined luminance curve gamma value of 2.2, and those skilled in the art can know that the predetermined luminance curve gamma value can be other values.

Example 4

FIG. 6 is a block diagram showing the structure of a color signal conversion device of a liquid crystal display according to an embodiment of the present invention. As shown in FIG. 6, the color signal conversion device 60 may mainly include a comparison unit 61 and a conversion output unit 62. The comparison unit 61 is mainly used to compare the magnitudes of the grayscale values of the R signal, the G signal, and the B signal in the input RGB signals; the conversion output unit 62 is connected to the comparison unit 61, and is mainly used in the comparison unit 61. When the comparison result is that the grayscale value of the B signal in the RGB signal is the smallest and the grayscale value of the R signal is greater than the grayscale value of the G signal, the RGB signal is converted into the first RGBY signal and the first An RGBY signal, wherein Y in the first RGBY signal a grayscale value of the signal is a grayscale value of the G signal in the RGB signal, a grayscale value of the G signal in the first RGBY signal is a minimum grayscale value, and a B signal in the first RGBY signal The grayscale value is a grayscale value of the B signal in the RGB signal, and the grayscale value of the R signal in the first RGBY signal is according to a grayscale value of the R signal in the RGB signal, the first RGBY The grayscale value of the Y signal in the signal, the maximum grayscale value, and a predetermined luminance curve gamma value are determined.

In a possible implementation, the conversion output unit 62 is further configured to: when the comparison result of the comparison unit 61 is that the gray level value of the B signal in the RGB signal is the smallest and the gray level value of the R signal is less than or In the case of a grayscale value equal to the G signal, converting the RGB signal into a second RGBY signal and outputting the second RGBY signal, wherein a grayscale value of the Y signal in the second RGBY signal is a grayscale value of the R signal in the RGB signal, a grayscale value of the R signal in the second RGBY signal is a minimum grayscale value, and a grayscale value of the B signal in the second RGBY signal is the RGB signal a grayscale value of the B signal in the second RGBY signal, a grayscale value of the G signal according to the grayscale value of the G signal in the RGB signal, and a grayscale value of the Y signal in the second RGBY signal The value, the maximum grayscale value, and the predetermined luminance curve gamma value are determined.

The color signal conversion device of the present embodiment can be used to perform the color signal conversion method of the first embodiment. The specific flow of the color signal conversion method is described in detail in the above embodiment 1.

In a possible implementation manner, in a case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, the conversion output unit 62 calculates the first RGBY according to the following formula 1. The grayscale value of the R signal in the signal,

In a possible implementation manner, the gray level value of the R signal in the RGB signal is less than or In the case of a grayscale value equal to the G signal, the conversion output unit 62 calculates a grayscale value of the G signal in the second RGBY signal according to Equation 2 below,

The color signal conversion device of the present embodiment can be used to perform the color signal conversion method of the second embodiment. For the specific flow of the color signal conversion method, refer to the specific embodiment of the above embodiment 2.

In a possible implementation manner, the conversion output unit 62 is further configured to: when the comparison result of the comparison unit 61 is that the grayscale value of the B signal in the RGB signal is not the smallest, the RGB is Converting a signal into a third RGBY signal and outputting the third RGBY signal, wherein converting the RGB signal into a third RGBY signal and outputting the third RGBY signal comprises: performing relative saturation of the RGB signal Lifting; obtaining a corresponding point D2 of the RGB triangle according to the increased relative saturation of the RGB signal and the length of the line segment OD in the RGB triangle, the RGB triangle being used to represent the color of the liquid crystal display Domain range; and outputting the third RGBY signal according to chromaticity coordinates of D2, wherein a grayscale value of the Y signal in the third RGBY signal is a minimum grayscale value, wherein, among the RGB triangles, The point is determined by reference white point coordinates, the point D1 is the corresponding point of the RGB signal in the RGB triangle, and the point D is the intersection of the ray OD1 and the RGB triangle.

In a possible implementation, the conversion output unit 62 acquires a corresponding point D2 of the third RGBY signal in the RGB triangle according to the following formula 3,

OD2=OD*S1 Equation 3

The above-mentioned color signal conversion device of the present embodiment can be used to perform the color signal conversion method of the third embodiment. The specific flow of the color signal conversion method is described in detail in the above embodiment 3.

A color signal conversion device of a liquid crystal display according to an embodiment of the present invention is capable of converting an original RGB signal into an RGBY signal. When the input color is yellow, an RGBY signal that makes the yellow color more vivid can be output, and when the input color is not yellow, an RGB signal that makes the colors of other colors more vivid can be output. Thus, the color signal conversion device according to the embodiment of the present invention can make the color of the converted color signal more vivid.

Example 5

FIG. 7 is a block diagram showing the structure of a color signal conversion device of a liquid crystal display according to an embodiment of the present invention. The color signal conversion device 1100 of the liquid crystal display may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried. The specific embodiments of the present invention do not limit the specific implementation of the computing node.

The color signal conversion device 1100 of the liquid crystal display includes a processor 1110, a communication interface 1120, a memory 1130, and a bus 1140. The processor 1110, the communication interface 1120, and the memory 1130 complete communication with each other through the bus 1140.

Communication interface 1120 is for communicating with network devices, including, for example, a virtual machine management center, shared storage, and the like.

The processor 1110 is configured to execute a program. The processor 1110 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

The memory 1130 is used to store files. The memory 1130 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. Memory 1130 can also be a memory array. The memory 1130 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.

In a possible implementation, the above program may be program code including computer operating instructions. The program can be specifically used to: perform the operations of the steps in Embodiments 1 to 3.

Those of ordinary skill in the art will appreciate that the various exemplary elements and algorithm steps in the embodiments described herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can select different methods for implementing the described functions for a particular application, but such implementation should not be considered to be beyond the scope of the present invention.

If the function is implemented in the form of computer software and sold or used as a stand-alone product, it is considered to some extent that all or part of the technical solution of the present invention (for example, a part contributing to the prior art) is It is embodied in the form of computer software products. The computer software product is typically stored in a computer readable non-volatile storage medium, including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all of the methods of various embodiments of the present invention. Or part of the steps. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A color signal conversion method for a liquid crystal display, comprising:

Comparing the magnitudes of the grayscale values of the R signal, the G signal, and the B signal in the input RGB signal;

Comparing the magnitudes of the grayscale values of the R signal and the G signal in the RGB signal in a case where the grayscale value of the B signal in the RGB signal is the smallest;

In a case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, converting the RGB signal into a first RGBY signal and outputting the first RGBY signal,

The grayscale value of the Y signal in the first RGBY signal is a grayscale value of the G signal in the RGB signal,

The gray scale value of the G signal in the first RGBY signal is a minimum gray scale value,

The grayscale value of the B signal in the first RGBY signal is a grayscale value of the B signal in the RGB signal,

a grayscale value of the R signal in the first RGBY signal according to a grayscale value of the R signal in the RGB signal, a grayscale value of the Y signal in the first RGBY signal, a maximum grayscale value, and a predetermined The brightness curve gamma value is determined.
The method of claim 1 further comprising:

In a case where the grayscale value of the R signal in the RGB signal is less than or equal to the grayscale value of the G signal, converting the RGB signal into a second RGBY signal and outputting the second RGBY signal,

The grayscale value of the Y signal in the second RGBY signal is a grayscale value of the R signal in the RGB signal,

The gray level value of the R signal in the second RGBY signal is a minimum gray scale value,

The grayscale value of the B signal in the second RGBY signal is a grayscale value of the B signal in the RGB signal,

a grayscale value of the G signal in the second RGBY signal according to a grayscale value of the G signal in the RGB signal, a grayscale value of the Y signal in the second RGBY signal, a maximum grayscale value, and the The predetermined brightness curve gamma value is determined.
The method according to claim 1, wherein in the case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, the first RGBY signal is calculated according to the following formula 1 Grayscale value of the R signal,

Wherein R 2 is a grayscale value of the R signal in the first RGBY signal, N is a maximum grayscale value, R 1 is a grayscale value of the R signal in the RGB signal, and Y 2 is the first The gray scale value of the Y signal in the RGBY signal, γ is the predetermined luminance curve gamma value.
The method according to claim 2, wherein in the case where the grayscale value of the R signal in the RGB signal is less than or equal to the grayscale value of the G signal, the second RGBY is calculated according to the following formula 2 The grayscale value of the G signal in the signal,

Wherein G 2 is a grayscale value of a G signal in the second RGBY signal, N is a maximum grayscale value, G 1 is a grayscale value of a G signal in the RGB signal, and Y 2 is the second The gray scale value of the Y signal in the RGBY signal, γ is the predetermined luminance curve gamma value.
The method according to any one of claims 1 to 4, wherein the method further comprises:

In a case where the grayscale value of the B signal in the RGB signal is not the smallest, the RGB signal is converted into a third RGBY signal and the third RGBY signal is output,

The converting the RGB signal into a third RGBY signal and outputting the third RGBY signal includes:

Enhancing the relative saturation of the RGB signals;

Obtaining a corresponding point D2 in the RGB triangle according to the improved relative saturation of the RGB signal and the length of the line segment OD in the RGB triangle, the RGB triangle being used to represent a color gamut range of the liquid crystal display;

Outputting the third RGBY signal according to chromaticity coordinates of D2, wherein a grayscale value of the Y signal in the third RGBY signal is a minimum grayscale value,

Wherein, in the RGB triangle, the O point is determined by reference white point coordinates, the D1 point is a point corresponding to the RGB signal in the RGB triangle, and the D point is an intersection of the ray OD1 and the RGB triangle.
The method according to claim 5, wherein the corresponding point D2 of the third RGBY signal in the RGB triangle is obtained according to the following formula 3,

OD2=OD*S1 Equation 3

Where OD2 is the length of the line segment OD2, OD is the length of the line segment OD, and S1 is the relative saturation after the lifting.
A color signal conversion device for a liquid crystal display, comprising:

a comparing unit for comparing a magnitude of a grayscale value of the R signal, the G signal, and the B signal in the input RGB signal;

And a conversion output unit, connected to the comparison unit, wherein a comparison result of the comparison unit is that a grayscale value of a B signal in the RGB signal is minimum and a grayscale value of the R signal is greater than a grayscale value of the G signal In the case, converting the RGB signal into a first RGBY signal and outputting the first RGBY signal,

The grayscale value of the Y signal in the first RGBY signal is a grayscale value of the G signal in the RGB signal,

The gray scale value of the G signal in the first RGBY signal is a minimum gray scale value,

The grayscale value of the B signal in the first RGBY signal is a grayscale value of the B signal in the RGB signal,

a grayscale value of the R signal in the first RGBY signal according to a grayscale value of the R signal in the RGB signal, a grayscale value of the Y signal in the first RGBY signal, a maximum grayscale value, and a predetermined The brightness curve gamma value is determined.
The apparatus according to claim 7, wherein the conversion output unit is further configured to: in the comparison result of the comparing unit, a grayscale value of a B signal in the RGB signal is minimum and a grayscale value of the R signal is In the case of less than or equal to the grayscale value of the G signal, converting the RGB signal into a second RGBY signal and outputting the second RGBY signal,

The grayscale value of the Y signal in the second RGBY signal is a grayscale value of the R signal in the RGB signal,

The gray level value of the R signal in the second RGBY signal is a minimum gray scale value,

The grayscale value of the B signal in the second RGBY signal is a grayscale value of the B signal in the RGB signal,

a grayscale value of the G signal in the second RGBY signal according to a grayscale value of the G signal in the RGB signal, a grayscale value of the Y signal in the second RGBY signal, a maximum grayscale value, and the The predetermined brightness curve gamma value is determined.
The apparatus according to claim 7, wherein in the case where the grayscale value of the R signal in the RGB signal is greater than the grayscale value of the G signal, the conversion output unit calculates the The grayscale value of the R signal in the first RGBY signal,

Wherein R 2 is a grayscale value of the R signal in the first RGBY signal, N is a maximum grayscale value, R 1 is a grayscale value of the R signal in the RGB signal, and Y 2 is the first The gray scale value of the Y signal in the RGBY signal, γ is a predetermined luminance curve gamma value.
The apparatus according to claim 8, wherein in a case where a grayscale value of the R signal in the RGB signal is less than or equal to a grayscale value of the G signal, the conversion output unit calculates according to the following formula 2 a grayscale value of the G signal in the second RGBY signal,

Wherein G 2 is a grayscale value of a G signal in the second RGBY signal, N is a maximum grayscale value, G 1 is a grayscale value of a G signal in the RGB signal, and Y 2 is the second The gray scale value of the Y signal in the RGBY signal, γ is a predetermined luminance curve gamma value.
The apparatus according to any one of claims 7 to 10, wherein the conversion output unit is further configured to: when the comparison result of the comparison unit is that the gray level value of the B signal in the RGB signal is not the minimum In the case of converting the RGB signal into a third RGBY signal and outputting the third RGBY signal,

The converting the RGB signal into a third RGBY signal and outputting the third RGBY signal includes:

Enhancing the relative saturation of the RGB signals;

Obtaining a corresponding point D2 in the RGB triangle according to the improved relative saturation of the RGB signal and the length of the line segment OD in the RGB triangle, the RGB triangle being used to represent the color gamut range of the liquid crystal display ;as well as

Outputting the third RGBY signal according to chromaticity coordinates of D2, wherein a grayscale value of the Y signal in the third RGBY signal is a minimum grayscale value,

Wherein, in the RGB triangle, the O point is determined by reference white point coordinates, the D1 point is a point corresponding to the RGB signal in the RGB triangle, and the D point is an intersection of the ray OD1 and the RGB triangle.
The apparatus according to claim 11, wherein the conversion output unit acquires a corresponding point D2 of the third RGBY signal in the RGB triangle according to the following formula 3,

OD2=OD*S1 Equation 3

Where OD2 is the length of the line segment OD2, OD is the length of the line segment OD, and S1 is the relative saturation after the lifting.