Touch-Display Panel Pad Protection via Segmented Bonding
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Solution Overview
Problem
Current touch-sensing display panels face challenges in durability due to limited contact area and protection of interconnection lines, which affects their mechanical properties and reliability.
Innovation Solution
The display panel design includes extended portions on the touch substrate that cover and expose portions of the pad unit on the display substrate, increasing the contact area and using sealing elements like glass powder to enhance bonding and protection, thereby improving durability and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch substrate is bonded to the display substrate with limited contact area, then the device complexity is reduced, but the durability and mechanical properties deteriorate
Solution Approach 1:
The bonding structure is segmented into multiple regions: a first bonding region with first bonding material and a second bonding region with second bonding material. This segmentation allows different materials to be used in different regions to optimize both bonding strength and durability without significantly increasing overall structural complexity.
Solution Approach 2:
Different bonding materials are applied to different regions of the bonding interface. The first bonding material is used in the first bonding region while the second bonding material is used in the second bonding region, allowing each region to have optimized local properties for its specific functional requirements.
2Object-affected harmful factors
If the touch substrate covers the pad unit completely, then the protection of interconnection lines is improved, but the contact area between substrates is reduced
Solution Approach 1:
The bonding structure is divided into multiple bonding regions with different materials, allowing the touch substrate to cover portions of the pad unit while maintaining adequate contact area through the segmented bonding approach.
Solution Approach 2:
The bonding structure uses composite materials comprising different bonding materials in different regions. This composite approach enables the touch substrate to provide protection to interconnection lines while maintaining sufficient contact area through the combined properties of different materials.
Data Source
AI summary
A display panel includes a display substrate including a display region and a non-display region surrounding the display region, a pad unit being positioned on a side region of the non-display region, and a touch substrate on the display substrate and bonded to the display substrate, the touch substrate including an input sensing unit overlapping the display region of the display substrate, a first extended portion extending from a side portion of the input sensing unit and overlapping the pad unit of the display substrate, and a second extended portion extending from a side portion of the input sensing unit and overlapping the pad unit of the display substrate, the second extended portion being spaced apart from the first extended portion, wherein a portion of the pad unit is exposed between the first and second extended portions.