Color Filter Substrate Grooves with Reflecting Layer
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Solution Overview
Problem
Existing color filter substrates in flat panel displays face challenges in preventing color mixture between adjacent pixel elements, which affects the color gamut and light emission efficiency.
Innovation Solution
A color filter substrate design featuring grooves on a base substrate with a reflecting layer and color-resist fillers, where the groove openings increase in size from bottom to top, and the reflecting layer is coated on the inner surface, allowing light to be emitted towards the display face, thereby preventing color mixture and enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional color filter substrate is used, then the structure is simple and easy to manufacture, but color mixture occurs between adjacent pixel elements reducing color gamut and light emission efficiency
Solution Approach 1:
The patent introduces grooves that divide the color filter substrate into separate regions corresponding to different pixel elements. These grooves physically segment the structure to prevent color diffusion between adjacent pixels, directly addressing the color mixture problem while maintaining manufacturing feasibility through standard photolithography and etching processes.
Solution Approach 2:
The patent applies different properties to different parts of the substrate: the grooves have specific depth and width variations, the reflecting layer is selectively positioned at the groove bottom, and color resist materials are locally filled in the groove regions. This local differentiation enables precise color control for each pixel element while preventing cross-contamination.
2Ease of manufacture
If grooves with uniform opening size are used, then the manufacturing process is simpler, but light emission efficiency is reduced due to poor light extraction
Solution Approach 1:
The patent employs asymmetric groove geometry where the opening width varies along the groove depth - narrower at the top and wider at the bottom. This asymmetric design optimizes light extraction efficiency by creating effective light-trapping structures while remaining compatible with standard semiconductor manufacturing processes that can achieve such profiles through controlled etching.
3Device complexity
If no reflecting layer is used, then the device complexity is reduced, but light emission towards the display face is insufficient
Solution Approach 1:
The patent extracts and concentrates light by placing a reflecting layer at the bottom of the grooves. This reflecting layer redirects light that would otherwise be lost or scattered, extracting maximum light emission in the direction of the display face. The groove structure itself acts as a light-extraction enhancement feature that works synergistically with the reflecting layer.
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 design effectively prevents color mixture between pixel elements, improving the color gamut and light emission efficiency by directing light emissions correctly, and using quantum dot particles further enhances spontaneous emission through localized surface plasmon resonance.
Implementation Method 1
a reflecting layer is coated on an inner surface of the groove
Implementation Method 2
using quantum dot particles further enhances spontaneous emission through localized surface plasmon resonance
Data Source
AI summary
Disclosed are a color filter substrate, a method for fabricating the same, and a display device. The color filter substrate includes a plurality of color-resist elements, and the color filter substrate further includes: a base substrate, and a groove arranged on the base substrate in correspondence to each of the color-resist elements, wherein a size of an opening of each groove is increase from the bottom to the top, a reflecting layer is coated on an inner surface of the groove, and a color-resist filler corresponding to a color of light emitted by the color-resist element is further filled in the groove above the reflecting layer.