Reflective Display Sub-Pixel Area Optimization for Yellow Luminance
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Solution Overview
Problem
Conventional reflective display devices struggle to achieve adequate luminance and saturation for the color yellow, as combining reflected red and green light results in a dingy appearance, and enhancing luminance and saturation is difficult.
Innovation Solution
A display device comprising sub-pixels with specific color filters transmitting light at peak spectra of reddish green, bluish green, red, and blue, where the third and fourth sub-pixels are larger than the first and second, allowing for increased area allocation to yellow reproduction, thereby enhancing luminance and saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional reflective display devices combine reflected red and green light to produce yellow, then the display device can show yellow color, but the luminance and saturation of yellow are insufficient and the appearance is dingy
Solution Approach 1:
The pixel is divided into four distinct sub-pixels (first, second, third, and fourth sub-pixels) with different color filter configurations. This segmentation allows independent optimization of each sub-pixel's spectral characteristics and area, enabling the yellow sub-pixel to have larger area for enhanced luminance and saturation while maintaining other color displays
Solution Approach 2:
Different sub-pixels are assigned different color filter properties and relative areas according to their specific function. The yellow-producing sub-pixels (first and second) are given larger areas with specific spectral peaks, while red and blue sub-pixels have different configurations. This local quality differentiation optimizes yellow luminance and saturation without compromising overall color reproduction
2Illumination intensity
If the area of sub-pixels is increased to enhance yellow luminance and saturation, then the yellow color quality improves, but the area available for other colors decreases
Solution Approach 1:
The pixel is divided into four distinct sub-pixels (first, second, third, and fourth sub-pixels) with different color filter configurations. This segmentation allows independent optimization of each sub-pixel's spectral characteristics and area, enabling the yellow sub-pixel to have larger area for enhanced luminance and saturation while maintaining other color displays
Solution Approach 2:
The sub-pixels are designed with asymmetric area distribution rather than equal areas. The first and second sub-pixels (producing yellow) have different relative areas compared to the third and fourth sub-pixels, optimized specifically for yellow luminance and saturation requirements while maintaining overall pixel area constraints
3Ease of manufacture
If conventional display devices use equal area sub-pixels for all colors, then the manufacturing is simple, but the yellow color quality is poor
Solution Approach 1:
Different sub-pixels are assigned different color filter properties and relative areas according to their specific function. The yellow-producing sub-pixels (first and second) are given larger areas with specific spectral peaks, while red and blue sub-pixels have different configurations. This local quality differentiation optimizes yellow luminance and saturation without compromising overall color reproduction
Solution Approach 2:
The relative areas of different sub-pixels are changed from equal distribution to optimized distribution. The first sub-pixel has a first relative area, the second sub-pixel has a second relative area, and these differ from the third and fourth sub-pixels. This parameter change specifically targets yellow luminance and saturation enhancement while maintaining manufacturability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The configuration effectively increases the luminance and saturation of yellow, while also improving the reproducibility of cyan and primary colors, and maintains constant reflection factor and contrast.
Implementation Method 1
a first color filter that transmits light having a spectrum peak falling on a spectrum of reddish green
Implementation Method 2
Each of the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel includes a reflective electrode that reflects light transmitted through the corresponding color filter
Data Source
AI summary
According to an aspect, a display device includes a pixel including: a first sub-pixel including a first color filter transmitting light having a spectrum peak falling on a spectrum of reddish green; a second sub-pixel including a second color filter transmitting light having a spectrum peak failing on a spectrum of bluish green; a third sub-pixel including a third color filter transmitting light having a spectrum peak falling on a spectrum of red; and a fourth sub-pixel including a fourth color filter transmitting light having a spectrum peak falling on a spectrum of blue. The first, second, third, and fourth sub-pixels each include a reflective electrode reflecting light transmitted through the color filter. Each of the third and fourth sub-pixels is greater in size than the first and second sub-pixels. The first sub-pixel with the second sub-pixel has a size equal to or greater than that of the third sub-pixel.