Color Filter Array Layout for Electrophoretic White Balance
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Solution Overview
Problem
Existing electrophoretic display devices face limitations in achieving optimal color performance and white balance due to the arrangement of color filter elements, particularly with the use of red, green, and blue filters, which can lead to suboptimal color reproduction.
Innovation Solution
Incorporating yellow color filter elements in specific configurations within the display device, ensuring they are separated from blue elements but connected to primary color elements, thereby improving color performance and maintaining white balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional RGB color filter elements are used in electrophoretic display, then the display can show color images, but the color performance and white balance are suboptimal
Solution Approach 1:
The color filter array is segmented into distinct regions: yellow color filter elements positioned at boundaries between sub-pixel regions, and primary color filter elements (red, green, blue) positioned within sub-pixel regions. This segmentation allows optimized color performance by separating the functional roles of different filter elements.
Solution Approach 2:
Different color filter elements are assigned to different locations with specific functions: yellow filters at boundaries to enhance overall color performance, and primary color filters within sub-pixels for precise color control. Each location has optimized local properties to achieve global color accuracy and white balance.
2Manufacturing precision
If yellow color filter elements are added to improve color performance, then white balance improves, but the arrangement complexity increases
Solution Approach 1:
The display surface is segmented into sub-pixel regions with yellow color filter elements positioned at their boundaries. This segmentation strategy systematically integrates yellow filters without disrupting the existing sub-pixel structure, maintaining control simplicity while improving white balance.
Solution Approach 2:
The yellow color filter elements serve multiple functions: they improve overall color performance, enhance white balance, and maintain compatibility with the existing sub-pixel control structure. This multi-functionality reduces the need for additional complex control mechanisms.
3Ease of manufacture
If yellow color filter elements are positioned adjacent to blue color filter elements, then manufacturing is simplified, but color performance deteriorates
Solution Approach 1:
The color filter array is segmented such that yellow color filter elements are positioned at boundaries between sub-pixel regions, separating them from primary color filter elements (including blue) within sub-pixel regions. This spatial segmentation prevents direct adjacency between yellow and blue filters while maintaining manufacturing feasibility through systematic positioning.
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 addition of yellow color filter elements enhances color performance and improves white balance by optimizing the arrangement of color filter elements, leading to better image reproduction.
Implementation Method 1
The present electrophoretic display (EPD) filters the light reflected by a display medium layer with a color filter array made by printing to form the corresponding images
Data Source
AI summary
A display device which includes a display panel having a display surface, a transparent layer over the display panel and a color filter array over the transparent layer is provided. The color filter array includes yellow color filter elements, blue color filter elements and primary color filter elements. The yellow color filter elements project first regions on the display surface; the blue color filter elements project second regions on the display surface; and the primary color filter elements project third regions on the display surface. Each of the first regions is connected to at least one of the third regions, while each of the first regions is separated from any one of the second regions.