RGBW Display Brightness Compensation via Gray Scale Scaling
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Solution Overview
Problem
The RGBW model for liquid crystal displays experiences a brightness reduction due to the smaller size of its red, green, and blue sub-pixels compared to the RGB model, leading to decreased brightness in the displayed colors.
Innovation Solution
A method and device for RGB to RGBW brightness compensation, which involves multiplying the gray scale values of the RGB model by a factor of 4/3, adjusting the resulting values to ensure they remain within valid ranges, and applying Gamma conversion to enhance the brightness of the RGBW model, thereby compensating for the brightness loss caused by the smaller sub-pixel sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RGBW model uses smaller red, green, and blue sub-pixels to maintain the same pixel size, then the white sub-pixel can be added to improve color representation, but the brightness of the displayed colors is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the gray scale values through multiplication by factor N (where N≥1, typically 4/3) to compensate for the brightness reduction. This mathematical transformation adjusts the luminance parameters of the RGB channels to match the reduced area of the sub-pixels, thereby restoring the overall brightness while maintaining the RGBW color representation capability
Solution Approach 2:
The patent implements preliminary anti-action by pre-calculating and applying compensation factors to counteract the expected brightness loss before display. The compensation method proactively adjusts the gray scale values in advance, preventing the brightness reduction issue from manifesting in the final display output
2Quantity of substance
If the sizes of the red, green, and blue sub-pixels are reduced to 3/4 of the original size to accommodate the white sub-pixel, then the pixel density increases, but the real converted brightness is reduced to 3/4 of the original
Solution Approach 1:
The patent changes the brightness parameter by multiplying the gray scale values by factor N (≥4/3) to compensate for the 3/4 area reduction. This parameter adjustment ensures that the luminance output matches the reduced sub-pixel area, thereby maintaining perceived brightness while achieving higher pixel density through the RGBW configuration
Solution Approach 2:
The patent performs preliminary action by pre-scaling the gray scale values before conversion to RGBW format. This advance adjustment ensures that when the smaller sub-pixels are used, the compensation has already been applied, preventing brightness loss in the final display
Data Source
AI summary
An RGB to RGBW brightness compensation method and device is disclosed. The method includes: retrieving multiple gray scale values of RGB color RGB(x, y, z), wherein x, y, z are gray scale levels of red, green and blue sub-pixels of an RGB model, 0≤x, y, z≤1; multiplying the gray scale values of RGB color RGB (x, y, z) by N to obtain an enhanced gray scale values of RGB color RGB (Nx, Ny, Nz), wherein N is 4/3 and a minimum value selected from x, y, z is taken to represent a first conversion value W1; and obtaining multiple gray scale values of RGBW color RGBW (Nx−W1, Ny−W1, Nz−W1, W1) according to the enhanced gray scale values of RGB color RGB (Nx, Ny, Nz) and the first conversion value W1. Accordingly, a brightness of the RGBW model of a liquid crystal panel is compensated.