Color Filter Substrate Transparent Regions for Reflective Displays
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Solution Overview
Problem
Color reflective display products suffer from reduced reflectivity due to the presence of color filtering layers, which limits their performance in outdoor applications under weak light conditions, and existing solutions like polarizers with scattering films provide limited improvements with high costs and reduced uniformity.
Innovation Solution
A color filter substrate with a light-shielding pattern and pixel regions containing both color filtering and transparent non-filtering layers, where the transparent non-filtering layer has a high light transmittance of over 80%, is used to enhance light reflectivity and display quality, with the transparent regions strategically positioned to optimize light transmittance and reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If color filtering layers are used to achieve color display, then color gamut is improved, but light reflectivity deteriorates
Solution Approach 1:
The pixel region is segmented into multiple sub-regions: color filtering regions (first, second, third sub-regions) and a transparent region (fourth sub-region). This segmentation allows different areas to serve different functions - color filtering areas maintain color display while the transparent area maximizes light reflectivity, thus resolving the contradiction between color gamut and light reflectivity
Solution Approach 2:
Different regions within the pixel are assigned different optical properties: color filtering layers are applied in specific sub-regions to provide color selection, while a transparent non-filtering layer is applied in the fourth sub-region to maximize light transmission and reflectivity. This local differentiation allows the display to maintain both color capability and high reflectivity
2Illumination intensity
If transparent regions are increased to improve light reflectivity, then light transmittance is improved, but color gamut deteriorates
Solution Approach 1:
The pixel region is divided into multiple functional sub-regions including color filtering regions and transparent regions. By segmenting the pixel area, the invention achieves a balance where transparent regions (occupying 10-40% of pixel area) provide high light transmittance and reflectivity, while the remaining color filtering regions maintain sufficient color gamut
Solution Approach 2:
The invention optimizes the area ratio of transparent regions to pixel regions within a specific range (10-40%). This parameter optimization ensures that enough transparent area is provided for high light reflectivity while maintaining sufficient color filtering area to preserve color gamut, thus resolving the contradiction through precise parameter control
3Illumination intensity
If polarizers with scattering films are used to improve reflectivity, then light reflectivity is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and removes the expensive polarizer and scattering film components from the display structure. Instead, it uses a simplified approach with color filtering layers and transparent non-filtering layers directly on the pixel substrate, achieving high reflectivity through optical design rather than expensive optical components, thus significantly reducing manufacturing cost
4Illumination intensity
If polarizers with scattering films are used to improve reflectivity, then light reflectivity is improved, but display uniformity deteriorates
Solution Approach 1:
The pixel is segmented into regular geometric sub-regions (color filtering sub-regions and transparent sub-region) with well-defined boundaries and area ratios. This regular geometric segmentation ensures uniform light distribution and consistent display characteristics across the screen, avoiding the uniformity problems associated with scattering films while maintaining high reflectivity
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 significantly improves the overall light reflectivity of the reflective display panel by up to 33% and maintains a color gamut sufficient for outdoor use, ensuring better display quality even in weak light conditions.
Implementation Method 1
the transparent non-filtering layer has a high light transmittance of over 80%, is used to enhance light reflectivity
Data Source
AI summary
The present disclosure provides a color filter substrate, including: a base substrate, and a light-shielding pattern on the base substrate and having a plurality of openings to define a plurality of pixel regions, wherein each of the plurality of pixel regions at least includes a color filtering region, and a color filtering layer is filled in each color filtering region, and at least one of the plurality of pixel regions further includes at least one transparent region, each of which is filled with a transparent non-filtering layer. The present disclosure further provides a reflective display panel and a manufacturing method for a color filter substrate.