Touch Display Panel Insulation Opening Geometry
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Solution Overview
Problem
Touch display panels face poor contact issues due to bridging between different film layers, affecting their touch performance and reliability.
Innovation Solution
A touch display panel design featuring a signal transmission layer, an insulation layer with specific insulation openings, and a touch layer stacked in a thickness direction, where the insulation openings have a larger first opening close to the signal transmission layer and a smaller second opening close to the touch layer, increasing the contact area and reducing contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bridging methods are used between different film layers, then the structure is simple, but the contact reliability is poor
Solution Approach 1:
The insulation opening is designed with non-uniform cross-sectional area, where the first opening area is larger than the second opening area. This local variation in geometry optimizes the contact interface between the signal transmission layer and touch layer, enhancing electrical connection reliability without requiring complete structural redesign
Solution Approach 2:
The solution transitions from considering only the top-down view of insulation openings to incorporating the thickness dimension. By designing different opening areas at different depths (first opening area near signal transmission layer, second opening area near touch layer), the patent utilizes the third dimension to optimize contact properties
2Reliability
If uniform insulation openings are used, then the manufacturing process is simple, but the contact area is insufficient leading to high contact resistance
Solution Approach 1:
The insulation opening features locally differentiated properties with larger opening area near the signal transmission layer and smaller opening area near the touch layer. This local quality variation increases the effective contact area for electrical connection, reducing contact resistance while maintaining manufacturing feasibility through standard photolithography and etching processes
Solution Approach 2:
The patent changes the geometric parameters of the insulation opening along the thickness direction, specifically varying the opening area from the first value to the second value. This parameter modification optimizes the electrical connection characteristics without fundamentally changing the manufacturing approach
Data Source
AI summary
Provided a touch display panel and a touch display device. The touch display panel includes a signal transmission layer, an insulation layer, and a touch layer disposed in stack in a thickness direction of the touch display panel. The insulation layer is provided with insulation openings penetrating therethrough, and the touch layer is electrically connected to the signal transmission layer through the insulation openings. The insulation openings include a first opening close to a side of the signal transmission layer and a second opening close to a side of the touch layer, and an opening area of the first opening is larger than an opening area of the second opening. The touch display panel provided can increase the contact area between the touch layer and the signal transmission layer, ensure reliability and stability of the connection, and improve the process yield and touch performance of the display panel.