Touch Screen Enhancement Layer for Substrate Strength
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Solution Overview
Problem
Conventional One Glass Solution (OGS) touch panels experience substrate warping and distortion after ITO coating, leading to reduced strength and increased yield rate due to stress concentration from existing micro-cracks, which can result in breakage.
Innovation Solution
A transparent photoresist material layer is applied as an enhancement layer on the substrate to improve its strength, reducing the likelihood of micro-crack extension and breakage, with a thickness ranging from 0.4 to 5 μm and a refraction index greater than 1.67, and incorporating a vanishing layer to enhance light vanishing effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO coating is applied to the substrate, then the touch screen achieves conductivity and capacitive functionality, but the substrate warps and distorts due to stress concentration from micro-cracks, reducing surface strength and increasing breakage risk
Solution Approach 1:
A buffer layer is formed on the substrate surface before the ITO coating process. This buffer layer absorbs and distributes the stress generated during ITO deposition, preventing stress concentration at micro-crack sites. The buffer layer acts as a cushion that mitigates the harmful effects of substrate micro-cracks before they can propagate and cause breakage, thereby maintaining substrate strength and reducing yield loss.
Solution Approach 2:
The patent introduces a composite structure consisting of the substrate, buffer layer, and ITO coating. The buffer layer serves as an intermediate material that combines the properties of the substrate and ITO, creating a composite system where the buffer layer's mechanical properties compensate for the substrate's weaknesses while allowing the ITO to maintain its electrical functionality.
2Strength
If the substrate surface is subjected to forced state during ITO coating, then the ITO layer adheres to the substrate, but the surface strength is reduced due to destruction of the forced state, leading to decreased yield rate
Solution Approach 1:
The buffer layer is prepared in advance to cushion the impact of forced state destruction during ITO coating. It absorbs the mechanical stress and prevents the complete destruction of the substrate's forced state, thereby preserving surface strength and reducing the generation of harmful micro-cracks that would lead to yield loss.
Solution Approach 2:
The buffer layer acts as an intermediary between the substrate and the ITO coating process. It mediates the interaction between the substrate's forced state and the external forces applied during ITO deposition, protecting the substrate's surface strength while still allowing adequate adhesion of the ITO layer.
Data Source
AI summary
A touch screen and a manufacturing method thereof are provided. The touch screen includes a substrate; and an enhancement layer provided on a surface of the substrate. The enhancement layer is configured to improve strength of the substrate. The method of manufacturing the touch screen includes forming an enhancement layer on a surface of the substrate. The enhancement layer is configured to improve strength of the substrate.