Touch Panel Insulating Layer Segmentation for Bending Stress
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Solution Overview
Problem
Display devices suffer from poor bending performance due to issues such as peeling off and cracking of the touch layer and film layer during bending, which affect the overall functionality and reliability.
Innovation Solution
A touch panel design featuring a touch metal layer and an insulating layer with strategically placed opening portions to reduce contact area and stress differences, accompanied by a protective layer to enhance bending performance and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch layer and film layer are made to be firmly attached to ensure good contact, then the touch control function is improved, but the bending performance deteriorates due to stress difference causing cracks and peeling during bending
Solution Approach 1:
The insulating layer is segmented into multiple body portions spaced apart, with opening portions between them. This segmentation reduces the continuous contact area between the insulating layer and touch metal layer, allowing stress to be distributed more evenly during bending and preventing crack propagation while maintaining sufficient electrical connection through the opening portions.
Solution Approach 2:
The insulating layer has different properties in different regions: the body portions provide insulation and structural support, while the opening portions expose the touch metal layer to maintain electrical connectivity. This local differentiation allows the structure to simultaneously achieve both insulation and flexibility during bending.
2Reliability
If the contact area between the insulating layer and touch metal layer is increased to improve insulation, then the insulating performance is improved, but the bending performance deteriorates due to increased stress concentration at the contact interface
Solution Approach 1:
The insulating layer is divided into discrete body portions rather than forming a continuous layer. This segmentation maintains sufficient insulation between adjacent conductive elements while reducing the total contact area with the touch metal layer, thereby decreasing stress concentration during bending operations.
Solution Approach 2:
The opening portions act as intermediaries that selectively expose the touch metal layer while maintaining insulation through the body portions. This intermediary structure allows the system to achieve both insulation and flexibility by controlling where the insulating layer contacts the metal layer.
Data Source
AI summary
The present application discloses a touch panel and method for manufacturing the same, and a display module. The touch panel includes: a touch substrate; and a touch layer, including a touch metal layer and an insulating layer, the touch metal layer being located at one side of the touch substrate, and the insulating layer including a body portion and at least an opening portion; the body portion being located in the same layer as the touch metal layer, or the body portion being located at a side of the touch metal layer away from the touch substrate; the opening portion exposing at least a portion of the touch metal layer.