Method of converting RGB to RGBW

A conversion method and normalization technology, which is applied in the field of conversion from RGB to RGBW, can solve problems such as color distortion of high-saturation pictures, and achieve the effects of improving color distortion, increasing saturation, and enhancing picture brightness

Active Publication Date: 2017-05-10
WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a conversion method from RGB to RGBW to solve the problem of color distortion of high-saturation pictures in the prior art

Method used

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  • Method of converting RGB to RGBW

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Embodiment 1

[0069] Please refer to figure 1 , figure 1 It is an implementation flowchart of a conversion method from RGB to RGBW according to an embodiment of the present invention, from figure 1 It can be seen that a conversion method from RGB to RGBW of the present invention comprises the following steps:

[0070] Step S101: Obtain the grayscale value of the RGB signal of each pixel in the current frame.

[0071] Step S102: converting the grayscale value of the RGB signal of each pixel into a brightness value, and normalizing the brightness value.

[0072] Step S103: Calculating the normalized gain value of each pixel, and counting the gain values ​​of pixels meeting the preset requirements in the entire screen to obtain a cumulative distribution curve of pixel gain values ​​in the entire screen.

[0073] Wherein, before obtaining the cumulative distribution curve diagram of the pixel point gain value of the whole picture, first obtain the distribution function diagram of the whole p...

Embodiment 2

[0097] This embodiment is mostly the same as the embodiment, except that the calculation method of the gain value PG of each pixel is different.

[0098] In this embodiment, calculating the gain value of each pixel after normalization processing specifically includes:

[0099] PG=(1+W S ), [M1 / M2≥W S / (1+W S ) or M2=0];

[0100] PG=min[1 / (M2-M1), (1+W S )], [M1 / M2S / (1+W S )];

[0101] Among them, PG is the gain value of a pixel (ie Pixel Gain), W S =W / (R+G+B), R, G, B and W are the luminance values ​​of RGBW, M2 is the maximum value of the normalized luminance values ​​rgb of RGB three colors of a pixel, and M1 is a pixel The minimum value among the normalized brightness values ​​rgb of the RGB tricolor of the point. The maximum value of the three normalized brightness values ​​of r, g, and b is 1, and the minimum value is 0.

[0102] Apart from this, other parts are the same as those in Embodiment 1, and will not be described in detail here.

[0103] A conversion met...

Embodiment 3

[0105] This embodiment is mostly the same as the embodiment, except that the calculation method of the gain value PG of each pixel is different.

[0106] In this embodiment, calculating the gain value of each pixel after normalization processing specifically includes:

[0107] PG=1 / M1,

[0108] Wherein, PG is a gain value of a pixel, and M1 is a minimum value among normalized brightness values ​​rgb of RGB three colors of a pixel. The maximum value of the three normalized brightness values ​​of r, g, and b is 1, and the minimum value is 0.

[0109] Apart from this, other parts are the same as those in Embodiment 1, and will not be described in detail here.

[0110] A conversion method from RGB to RGBW of the present invention converts the grayscale value of the RGB input signal of each pixel into a brightness value, and normalizes the brightness value to obtain a cumulative distribution curve of the frame gain value , and then according to a preset ordinate value and the co...

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Abstract

The invention provides a method of converting RGB to RGBW. The method comprises steps: the gray scale value of an RGB signal of each pixel point in the current frame of image is acquired; the gray scale value of the RGB signal of each pixel point is converted to a brightness value, and the brightness value is subjected to normalization processing; the gain value of each pixel point after normalization processing is calculated, the gain values of pixel points meeting a preset requirement in the whole frame of image are counted, and a cumulative distribution curve for the gain values of the pixel points in the whole frame of image is obtained; one longitudinal coordinate value of the cumulative distribution curve set by a user is received, and a horizontal ordinate value corresponding to the longitudinal coordinate value serves as a frame gain value; according to the frame gain value and a preset rule, an output value of RGBW is acquired and outputted; and according to the size of the frame gain value, the brightness of backlight is adjusted. While the brightness of the image is enhanced, the color distortion problem appearing in an RGBW display mode is improved, and the saturation of the image is improved.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of liquid crystal display, in particular to a conversion method from RGB to RGBW. [0003] 【Background technique】 [0004] The principle of RGBW LCD screen technology is to add a white (W) sub-pixel to the traditional RGB pixel composed of red (R), green (G), and blue (B), and then apply the corresponding sub-pixel Imaging technology to better arrange these sub-pixels in the way humans see images. As the resolution of a liquid crystal display (Liquid Crystal Display, LCD) is getting higher and higher, and the pixels are getting finer and finer, the aperture ratio of the liquid crystal pixels is getting lower and lower, which in turn causes a decrease in light transmittance. Therefore, the emergence of the RGBW four-color pixel design display screen solves the problem of low light transmittance of the white screen of the liquid crystal display screen, reduces power consumption, and can play the role ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3607
Inventor 钟新辉潘彪崔宏青李得俊龙柏华
Owner WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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