Reflective Display Panel Cell Gap Layout for White and Color Subpixels
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Solution Overview
Problem
In reflective display panels, discontinuities between adjacent sub-pixels, particularly between white and red sub-pixels, reduce reflectivity and affect red chromaticity due to differences in cell gaps, leading to performance issues.
Innovation Solution
A reflective display panel design with distinct cell gaps and buffer layers in white and color sub-pixels, where the white sub-pixel has a smaller cell gap and an additional buffer layer, enhancing reflectivity and chromaticity by adjusting the optical path difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a photoresist layer is set on the color filter substrate for color sub-pixels, then color filtering is achieved, but discontinuities between adjacent sub-pixels are created that reduce reflectivity
Solution Approach 1:
The patent applies different cell gap dimensions to different sub-pixel regions: color sub-pixels have a first cell gap while white sub-pixels have a second cell gap that is different from the first. This local differentiation resolves the contradiction by allowing color filtering in color sub-pixels while maintaining optimal reflectivity in white sub-pixels through the adjusted cell gap, eliminating the discontinuity issue without compromising color filter formation.
2Ease of manufacture
If the cell gap of color sub-pixel is reduced to accommodate color resist layer, then color filtering is enabled, but reflectivity and red chromaticity performance deteriorate
Solution Approach 1:
The patent implements local quality by establishing different cell gap specifications for different sub-pixel types. Color sub-pixels maintain their required cell gap for color resist layer integration, while white sub-pixels are given a different cell gap dimension that optimizes reflectivity. This resolves the contradiction by allowing color sub-pixels to have smaller cell gaps for manufacturability while white sub-pixels compensate with adjusted gaps to maintain overall display performance.
Solution Approach 2:
The patent changes the cell gap parameter specifically in white sub-pixel regions to compensate for the reduced cell gap in color sub-pixels. By adjusting this physical parameter in specific regions, the patent maintains optimal optical performance (reflectivity and chromaticity) while accommodating the manufacturing requirements of color sub-pixels with their color resist layers.
3Reliability
If white sub-pixel area is increased to improve reflectivity, then white display performance is enhanced, but color sub-pixel area is reduced affecting overall display quality
Solution Approach 1:
The patent resolves this area trade-off by changing the cell gap parameter in white sub-pixels rather than simply increasing their area. By optimizing the cell gap dimension in white sub-pixels, the patent achieves improved reflectivity and white display performance without necessarily sacrificing color sub-pixel area, as the optical performance enhancement comes from dimensional optimization rather than area expansion.
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 solution improves reflectivity and chromaticity by optimizing cell gaps and buffer layers, specifically increasing red color saturation and maintaining white reflectivity while minimizing color shifts.
Implementation Method 1
enhancing reflectivity and chromaticity by adjusting the optical path difference
Implementation Method 2
reflective layer disposed on the first substrate
Data Source
AI summary
A reflective display panel includes a first substrate and a second substrate. A thin film transistor and a reflective layer are disposed on the first substrate. A color resist layer is disposed on the second substrate. The reflective display panel includes a color sub-pixel region and a white sub-pixel region adjacent to each other. The color sub-pixel region has the color resist layer, and the white sub-pixel region has no color resist layer. A buffer layer is disposed in the white sub-pixel region on the first substrate or the second substrate. A cell gap between the first substrate and the second substrate in the white sub-pixel region is smaller than a cell gap between the first substrate and the second substrate in the color sub-pixel region. In this way, reflectivity and chromaticity can be improved.