RGBW Display Pixel Segmentation for Luminance Compensation
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Solution Overview
Problem
The RGBW pixel structure in liquid crystal displays improves light transmission efficiency but compromises color quality and contrast ratio due to reduced areas of other color pixels, leading to deteriorated yellow luminance compared to white luminance.
Innovation Solution
A display device with alternating blocks of red, green, blue, and white pixels, where a yellow, cyan, or magenta pixel is included to compensate for luminance loss, with the yellow pixel occupying more than 50% of its block area, and specific gate and data line connections to apply opposite polarities for improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the RGBW pixel structure is adopted to increase light transmission efficiency, then power consumption is reduced and luminance is improved, but the area of other color pixels is reduced causing deteriorated color quality and contrast ratio
Solution Approach 1:
The pixel array is divided into first blocks containing only primary color pixels (R, G, B) and second blocks containing primary color pixels plus a fifth color pixel (Y, C, or M). This segmentation allows different pixel configurations in different regions, maintaining color quality in first blocks while improving light transmission efficiency in second blocks with the fifth color pixel added.
Solution Approach 2:
Different block types are distributed throughout the display to provide local optimization. First blocks maintain traditional RGB structure for color accuracy, while second blocks incorporate the fifth color pixel for enhanced luminance and efficiency. The human visual system integrates these local variations into acceptable overall image quality.
2Illumination intensity
If the white pixel is added to improve light transmission efficiency, then luminance output is doubled, but the yellow luminance ratio compared to white luminance deteriorates from 90% to 45%
Solution Approach 1:
The fifth color pixel (yellow, cyan, or magenta) acts as an intermediary to compensate for the luminance deficiency caused by the white pixel. By positioning the fifth color pixel adjacent to the white pixel in second blocks, it provides the missing color luminance component, restoring the yellow-to-white luminance ratio while preserving the high luminance output benefit of the white pixel.
3Productivity
If the area of white pixel is increased to maximize light transmission, then power efficiency improves, but the area available for other color pixels is reduced causing contrast ratio deterioration
Solution Approach 1:
The display is segmented into first blocks with traditional RGB pixels for maintaining contrast ratio and second blocks with added fifth color pixels for maximizing light transmission efficiency. This segmentation allows each block type to optimize for its specific function while the overall display achieves both high efficiency and good contrast through the combination of block types.
Data Source
AI summary
The present invention provides a display device including a first block including a first primary color pixel and a second primary color pixel having substantially a same area, a second block alternatingly disposed with the first block along the first direction, the second block including a third primary color pixel, a fourth primary color pixel and a white pixel. The first block and the second block have substantially a same area and the third primary color pixel has an area wider than the fourth primary color pixel and the white color pixel.