Color Filter Substrate with Edge Thickness Variation for Red-Shift Compensation
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Solution Overview
Problem
Conventional Vertical Alignment (VA) liquid crystal display panels experience a significant decrease in contrast ratio and color shift when viewed from the side, particularly exhibiting a red-shift phenomenon due to uniform thickness of color filters leading to uneven transmittance of red, green, and blue light.
Innovation Solution
The color filter substrate is designed with varying thicknesses of red, green, and blue color filters, where the cell gap for red filters is greater at the center than at the edge, and the thicknesses of blue and green filters are maintained or reduced at the edge to match the center ratios, ensuring consistent brightness ratios across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform thickness color filters are used, then manufacturing is simple, but red-shift phenomenon occurs at edge region
Solution Approach 1:
The patent applies local quality by making the color filter thickness non-uniform across different regions. Specifically, the edge region has a different thickness (either thicker or thinner depending on the embodiment) compared to the center region, allowing local compensation for the red-shift phenomenon while maintaining overall manufacturing feasibility through a single-layer deposition process with controlled thickness variation.
2Object-affected harmful factors
If red color resist thickness is increased at edge region, then transmittance difference is reduced, but manufacturing precision requirement increases
Solution Approach 1:
The patent changes the thickness parameter of the red color resist from uniform to non-uniform distribution. By controlling the thickness to vary across different regions (center vs. edge), the patent compensates for the red-shift phenomenon while managing manufacturing precision requirements through established thin-film deposition techniques that can achieve controlled thickness variations.
3Object-affected harmful factors
If varying thickness color filters are used, then color shift is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by making the color filter thickness non-uniform across different regions. Specifically, the edge region has a different thickness (either thicker or thinner depending on the embodiment) compared to the center region, allowing local compensation for the red-shift phenomenon while maintaining overall manufacturing feasibility through a single-layer deposition process with controlled thickness variation.
Solution Approach 2:
The patent transitions from a one-dimensional uniform thickness parameter to a two-dimensional spatially varying thickness parameter. By introducing spatial variation in the thickness across the filter substrate, the patent addresses color shift issues without requiring additional filter layers or complex multi-component structures.
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
This configuration reduces the red-shift phenomenon by minimizing the difference in transmittance of red light between the center and edge regions, maintaining consistent brightness ratios for improved display quality and reducing color shift issues.
Implementation Method 1
a cell gap corresponding to the red color resists at the center region of the liquid crystal panel is greater than a cell gap corresponding to the red color resists at the edge region to reduce the difference of the red light of the transmittance
Data Source
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AI summary
A color film substrate (100), a liquid crystal panel, a liquid crystal display device and a preparation method therefor, the color film substrate (100) comprising a substrate (10) and a plurality of red color resists which are disposed on the substrate (10), the thickness of a plurality of red color resists which are at an edge region of the substrate (10) being greater than the thickness at a central region of the substrate (10). By means of the foregoing means, a box gap which corresponds to a red color resist of a central area of a liquid crystal display panel which is prepared by using the color film substrate (100) is larger than a box gap which corresponds to a red color resist of an edge region such that color offset of the edge region of the liquid crystal display panel is compensated, thus improving the phenomenon wherein red shift appears at an edge region of a liquid crystal display panel, and increasing display quality of the liquid crystal display panel.