Display Panel Bridge Segmentation for Touch Reliability
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Solution Overview
Problem
The reliability and touch sensitivity of capacitance touch panels are compromised due to the use of metal bridges in display panels, which are made light-proof and thus short and thin to reduce visibility, leading to higher breakage risk and increased resistance.
Innovation Solution
The display panel design includes a bridge structure with at least two bridges connecting adjacent second electrode blocks, and a first connection electrode with a shorter overlapping and longer non-overlapping portion, reducing the risk of bridge failure and increasing electric charge flow, thereby enhancing reliability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the bridge is made short and thin to reduce visibility, then the visibility of the bridge is reduced, but the breakage possibility of the bridge increases and reliability deteriorates
Solution Approach 1:
The bridge structure is divided into multiple bridge segments (first bridge segment and second bridge segment) connected in series between adjacent second electrode blocks. This segmentation allows the total bridge length to be distributed across multiple shorter segments, reducing the visibility impact of each individual segment while maintaining the electrical connection function. The segmented structure also provides redundancy, so if one segment fails, other segments can maintain connectivity, thereby improving reliability.
2Illumination intensity
If the bridge is made short and thin to reduce visibility, then the visibility of the bridge is reduced, but the resistance increases and touch sensitivity deteriorates
Solution Approach 1:
The bridge is segmented into multiple sections with different electrode block arrangements. The first bridge segment contains first electrode blocks that extend in the first direction, while the second bridge segment contains second electrode blocks that extend in the second direction. This segmentation allows for optimized electrode dimensions in different directions, reducing resistance in the touch detection path while maintaining short overall bridge structure for visibility.
Solution Approach 2:
Different parts of the bridge structure have different electrode block configurations tailored to local requirements. The first electrode blocks in the first bridge segment are optimized for conductivity in the first direction, while the second electrode blocks in the second bridge segment are optimized for the second direction. This local optimization ensures low resistance where needed while keeping the overall bridge structure compact.
Data Source
AI summary
A display panel and a display device include first electrodes arranged in first direction and extending in second direction, and second electrodes arranged in second direction and extending in first direction; any two adjacent first electrode blocks in each first electrode are electrically connected to each other by a first connection electrode; any two adjacent second electrode blocks in each second electrode are connected to each other by a bridge structure, each bridge structure includes at least two bridges; each first connection electrode includes a first overlapping electrode and a first non-overlapping electrode, orthographic projections of the first overlapping electrode and the bridges on the display panel overlap, and orthographic projections of the first non-overlapping electrode and the bridges on the display panel do not overlap; and the first overlapping electrode has a length in the first direction smaller than the first non-overlapping electrode in the first direction.