Touch Substrate Overcoat Segmentation for Film Deposition Quality
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Solution Overview
Problem
Touch products with full-layer overcoat layers made of organic materials suffer from poor chemical stability, leading to defects such as material deflation, yellowing, and poor film deposition quality due to the large overall thickness of these layers.
Innovation Solution
A touch substrate design where the first and second overcoat layers cover the touch electrode, with their areas less than the base substrate surface area, and their patterns matching the touch electrode, reducing the overall thickness and improving film deposition quality by minimizing the area of the overcoat layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-layer overcoat layers are used to protect touch electrodes, then the touch electrodes are well protected and isolated, but the chemical stability deteriorates and defects increase due to poor material stability and large overall thickness
Solution Approach 1:
The patent divides the overcoat structure into multiple separate layers (first overcoat layer, second overcoat layer, third overcoat layer) with different materials and functions. Each layer is segmented to perform specific tasks: the first overcoat layer provides insulation, the second overcoat layer provides protection, and the third overcoat layer provides additional insulation. This segmentation allows each layer to be optimized for its specific function, improving overall chemical stability while maintaining protection of touch electrodes.
Solution Approach 2:
The patent applies different materials and properties to different regions and layers of the overcoat structure. The first overcoat layer uses a first material with specific insulation properties, the second overcoat layer uses a second material with different protection properties, and the third overcoat layer uses a third material. This local quality approach ensures that each region has the appropriate material properties for its specific function, resolving the contradiction between protection and chemical stability.
2Area of stationary object
If full-layer overcoat layers are used, then complete coverage is achieved, but film deposition quality deteriorates due to large overall thickness
Solution Approach 1:
The patent segments the overcoat coverage into multiple layers with different areal extents. The first overcoat layer covers a first area, the second overcoat layer covers a second area, and the third overcoat layer covers a third area. By segmenting the coverage, the overall thickness is controlled while maintaining complete coverage of the touch electrodes. This resolves the contradiction between full coverage and film deposition quality.
3Reliability
If large area overcoat layers are used, then complete protection is provided, but defects increase due to material deflation and yellowing
Solution Approach 1:
The patent uses a composite overcoat structure with multiple materials having different properties. The first overcoat layer uses a first material, the second overcoat layer uses a second material, and the third overcoat layer uses a third material. This composite structure combines the advantages of different materials to provide complete protection while reducing material deflation and yellowing. The different materials complement each other to resolve the contradiction between protection completeness and harmful factors.
Data Source
AI summary
A touch substrate, a method for manufacturing a touch substrate, and a touch display device are provided. The touch substrate includes: a base substrate having a first surface; a first over coat layer on the first surface; a first touch electrode on the first over coat layer; and a second over coat layer on the first touch electrode, wherein the first touch electrode is located between the first over coat layer and the second over coat layer, and the second over coat layer covers at least the first touch electrode, and wherein an area of at least one of the first over coat layer and the second over coat layer is less than an area of the first surface in the touch area.