Touch Display Device Resistance Reduction via Bridge Metal Layer Merging
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Solution Overview
Problem
Touch display devices face challenges in achieving high touch sensitivity while minimizing the resistance of touch electrodes without increasing the thickness of the touch sensor, and existing solutions often require additional metal layers.
Innovation Solution
The implementation of a resistance reduction type touch sensor structure that utilizes existing metal layers, including a substrate with first and second touch electrode lines, where the electrodes are electrically connected through bridge metal layers and touch-interlayer insulating layers, allowing for efficient resistance reduction without adding new metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional metal layers are added to reduce resistance, then touch sensitivity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the touch electrode function with existing bridge metal layers that were previously used solely for connecting display electrodes. By making the bridge metal layer serve dual purposes as both a connection structure and a touch electrode, the patent reduces resistance and improves touch sensitivity without adding new metal layers, thereby resolving the contradiction between improved touch sensitivity and increased device complexity
Solution Approach 2:
The bridge metal layer is designed to perform multiple functions: it serves as both the connection structure between display electrodes and as the touch electrode for sensing input. This multi-functionality allows the patent to reduce the number of separate components while improving touch sensitivity, effectively addressing the contradiction between enhanced performance and reduced complexity
2Reliability
If touch electrode resistance is reduced by adding metal layers, then touch sensitivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
By combining the touch electrode function with the existing bridge metal layer, the patent eliminates the need for additional metal layers that would require precise alignment. The bridge metal layer is already positioned and connected during the display panel manufacturing process, so using it as the touch electrode avoids introducing new alignment precision requirements, thus resolving the contradiction between improved touch sensitivity and increased manufacturing precision demands
3Reliability
If touch sensor thickness is increased to reduce resistance, then touch sensitivity is improved, but device thickness increases
Solution Approach 1:
The patent achieves resistance reduction by utilizing the existing bridge metal layer that is already part of the display panel structure, rather than adding new metal layers or increasing the thickness of existing touch sensor components. This approach reduces resistance and improves touch sensitivity while maintaining the original touch sensor thickness, effectively resolving the contradiction between improved touch sensitivity and increased device thickness
Data Source
AI summary
A display panel and a touch display device are disclosed. The display panel includes a first touch electrode positioned in the first area, a second touch electrode positioned in the second area, a third touch electrode positioned in the third area, a fourth touch electrode positioned in the fourth area, and a first connection pattern electrically connecting the first touch electrode and the second touch electrode. A connection portion between the third touch electrode and the fourth touch electrode may pass through an intermediate area between the first area and the second area. The first connection pattern may pass through the intermediate area between the first area and the second area and may cross the connection portion between the third and fourth touch electrodes. Each of the first, second, third and fourth touch electrodes may include a first metal layer and a second metal layer, the first metal layer and the second metal layer may be separated by a touch-interlayer insulating layer. The first connection pattern may be disposed on one of the first metal layer and the second metal layer. The first connection pattern may be located in one of the first metal layer and the second metal layer.