Display Sub-Pixel Area Ratios for Brightness and Color Accuracy
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Solution Overview
Problem
Display apparatuses with added yellow sub-pixels suffer from reduced image quality due to yellowish white colors when displaying white, compromising brightness and color reproducibility.
Innovation Solution
Incorporating red, green, blue, yellow, and white sub-pixels with specific area ratios, such as 2:2:2:1 or 4:4:4:2, on substrates to enhance brightness and color reproducibility while preventing white colors from becoming yellowish, as per the CIE 1931 color coordinate system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a yellow sub-pixel is added to the display apparatus, then brightness and color reproducibility are improved, but white colors become yellowish, reducing image quality
Solution Approach 1:
The patent applies local quality by assigning different area ratios to different sub-pixels based on their specific color characteristics. The blue sub-pixel is given a larger area (equal to or larger than other sub-pixels) to compensate for its lower luminous efficiency, while the yellow sub-pixel has a smaller area to prevent excessive yellow tint. This localized optimization of each sub-pixel's area resolves the contradiction between improving brightness and maintaining color accuracy.
Solution Approach 2:
The patent changes the physical parameter of sub-pixel area to resolve the contradiction. Specifically, it establishes that the blue sub-pixel area should be substantially equal to or larger than the areas of red, green, yellow, and white sub-pixels. This parameter change allows the display to achieve improved brightness and color reproducibility while preventing white colors from becoming yellowish, as the larger blue sub-pixel area compensates for the yellow sub-pixel's contribution to white color mixing.
2Manufacturing precision
If yellow sub-pixel area is increased to improve color reproducibility, then yellow color display is enhanced, but white color balance is disrupted
Solution Approach 1:
The patent applies the anti-weight principle by using the blue sub-pixel as a counterbalance to the yellow sub-pixel. The blue sub-pixel, having a larger area, provides a compensating effect that prevents the yellow sub-pixel from dominating the white color mixture. This counterbalancing approach maintains white color balance while still allowing the yellow sub-pixel to contribute to improved color reproducibility in colored regions.
Data Source
AI summary
A display apparatus includes a first substrate, a second substrate facing the first substrate, and pixels disposed between the first and second substrates to display an image. Each pixel includes a red sub-pixel for displaying a red color, a green sub-pixel for displaying a green color, a blue sub-pixel for displaying a blue color, a yellow sub-pixel for displaying a yellow color, and a white sub-pixel for displaying a white color. The blue sub-pixel has an area substantially equal to or larger than an area of each of the red, green, yellow, and white sub-pixels.