Tetrachromatic Color Filter Array for Reflective Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electro-optic displays, particularly particle-based electrophoretic displays, face issues with long-term image quality due to particle settling, which affects their service life and widespread adoption, and there is a need for improved color filter arrays to enhance the appearance of color images.
Innovation Solution
A color filter array using a new set of four primary colors, which includes two pairs of hues that average to gray, providing improved red, green, and blue color saturation while maintaining a better white state, is introduced. This array can be composed of pixels with specific hue angles in the La*b* color space, including complementary subtractive/additive color pairs like red/cyan, green/magenta, and blue/yellow, ensuring optimal color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional RGB or CMY color filter arrays are used, then manufacturing is simpler, but color saturation and white state quality are insufficient
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional three-primary (RGB or CMY) color filter arrays to a four-primary tetrachromatic color filter array. This involves changing the fundamental parameters of the color system by adding a fourth primary color (yellow) to the three primary colors (red, green, blue), thereby expanding the color gamut and improving both color saturation and white state quality without fundamentally altering the manufacturing process
2Illumination intensity
If particle-based electrophoretic displays are used, then brightness and contrast are improved, but particle settling occurs reducing service life
Solution Approach 1:
The patent applies composite materials by combining multiple encapsulated electrophoretic media with different optical properties (white, black, and color-filtered layers) into a single display structure. This composite approach allows each layer to perform its specific function while working together to achieve high brightness, contrast, and long service life without particle settling issues
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 new color filter array enhances the attractiveness of color images by achieving better color saturation and white state compared to traditional RGB and CMY primaries, resulting in improved contrast and color gamut, making the displays more appealing to the human eye.
Implementation Method 1
a color filter array comprising four colors... a first sub-pixel having a first hue P1 positioned at a first hue angle h1 in the a*b* plane of the La*b* color space
Data Source
AI summary
A tetrachromatic color filter array comprises multiple pixels, each of which comprises first, second, third and fourth sub-pixels having first, second, third and fourth hues, P1, P2, P3 and P4 respectively, these first, second, third and fourth hues having first, second and third hue angles, h1, h2, h3 and h4 respectively. The hues of the sub-pixels such that h3 equals h1+(180°±10°) and h4 equals h2+(180°±10°) in the a*b* plane of the La*b* color space.