Multi-primary color display with fourth primary color
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Solution Overview
Problem
Conventional three-primary color displays, such as those using red, green, and blue, are unable to accurately represent all colors in nature, particularly sky blue and gold, due to limitations in color gamut and brightness.
Innovation Solution
Incorporating a fourth primary color with a peak wavelength between 550 nm and 600 nm, and adjusting the relative luminance ratios of this new color to the existing primary colors to enhance the color gamut while maintaining or improving brightness, by using a display device with a backlight source and pixels comprising sub-pixels for each primary color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fourth primary color is added to increase color gamut, then the color representation capability is improved, but the device complexity increases
Solution Approach 1:
The display device divides each pixel into multiple sub-pixels, with each sub-pixel responsible for displaying a specific primary color (red, green, blue, or yellow). This segmentation allows the system to achieve wider color gamut through coordinated emission of multiple sub-pixels while maintaining manageable device complexity by assigning dedicated functions to each sub-pixel type.
2Adaptability or versatility
If the saturation of three primary colors is increased to enlarge color gamut, then the color gamut is improved, but the brightness decreases
Solution Approach 1:
The invention introduces a fourth primary color (yellow) with specific luminance characteristics to change the color gamut parameters without sacrificing brightness. By carefully controlling the relative luminance of the yellow sub-pixel compared to other primary colors, the system expands color representation while maintaining adequate brightness levels that would be lost if only saturation increase was used.
Data Source
AI summary
A multi-primary color display has a backlight source and pixels. Each pixel has at least four sub pixels, which display red primary color, green primary color, blue primary color and a fourth primary color, respectively. At the peak position of the fourth primary color located in the wavelength range between 550 nm˜600 nm, the relative luminance ratio of the fourth primary color to the green primary color is greater than or equal to 0.5. When the ratio of the relative luminance meets the requirement and the relative luminance of a newly added primary color is greater than a certain value, the colors beyond the three-primary color gamut, which includes natural colors and other colors outside the natural color gamut, can be reproduced.