COA Display Panel Arc-Shaped Through Holes
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Solution Overview
Problem
The color-filter on array (COA) display panels face issues with mura abnormality due to the thick color resist layer, which forms steep steps and leads to poor alignment and image quality, as the alignment solution piles up in these steps during the manufacturing process.
Innovation Solution
The COA display panel design features a color resist layer with arc-shaped edges on its through holes, allowing for smooth alignment solution flow and preventing accumulation, thereby improving image quality. This is achieved by using a mask with semi-permeable membranes or slits to create a smooth edge during the exposure process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thick color resist layer is used in COA display panel manufacturing, then the through hole digging process is simplified, but steep steps are formed causing alignment solution to pile up and generate mura abnormality
Solution Approach 1:
The patent applies curvature by forming an arc-shaped edge at the opening of the through hole in the color resist layer. This curved geometry replaces the traditional sharp or stepped edge, allowing the alignment solution to flow smoothly along the arc without piling up. The arc-shaped edge effectively eliminates the steep step problem while maintaining the thick color resist layer structure, thus resolving the contradiction between manufacturing ease and alignment precision.
2Area of stationary object
If the color filter substrate is directly covered on the array substrate in COA technology, then the aperture ratio is increased and substrate alignment is simplified, but through holes are required for electrode signal connection
Solution Approach 1:
The patent applies local quality by creating a through hole with an arc-shaped opening edge in the color resist layer. This localized structural modification allows the through hole to serve multiple functions: maintaining the direct substrate coverage for high aperture ratio while providing a smooth pathway for electrode signal connection. The arc-shaped edge specifically addresses the local requirement for signal transmission without compromising the overall COA structure.
Data Source
AI summary
A color-filter on array (COA) display panel is provided. The COA display panel includes an array substrate, a color filter substrate disposed opposite to the array substrate, a component layer disposed on the array substrate, and a color resist layer covering the component layer; wherein the color resist layer is configured with at least one through hole, and an edge of an opening of the at least one through hole is arc-shaped.