Mesh Touch Sensor Layout for Foldable Display Reliability
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Solution Overview
Problem
Existing display apparatuses, particularly flexible and foldable ones, face challenges in ensuring the reliability of touch sensing units due to structural and electrical connectivity issues.
Innovation Solution
A display apparatus with a touch sensing unit featuring a mesh-shaped arrangement of first and second touch sensing parts connected by insulation layers and connection parts, ensuring non-overlapping and symmetrical configurations to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensing parts are arranged in a mesh shape with connection parts to ensure electrical connectivity, then the touch sensing function is improved, but the structural reliability deteriorates due to overlapping connection parts causing short circuits
Solution Approach 1:
The patent extracts and removes the overlapping connection parts that cause short circuits. Specifically, the first connection part is designed to extend only to a position that does not overlap with the second connection part, thereby eliminating the harmful overlap while maintaining the mesh structure's touch sensing functionality.
Solution Approach 2:
The patent segments the connection parts into distinct non-overlapping regions. The first connection part and second connection part are divided into separate spatial zones, with the first connection part positioned in a first region and the second connection part in a second region, preventing electrical short circuits while maintaining connectivity.
2Reliability
If connection parts are extended to cross touch sensing parts to improve connectivity, then electrical stability is improved, but manufacturing precision deteriorates due to alignment complexity
Solution Approach 1:
The patent applies local quality by designing the first connection part to have different extension characteristics in different regions. The connection part extends in a first direction to connect first touch sensing parts while deliberately avoiding extension into regions where second connection parts are located, creating localized connectivity without global overlap complexity.
3Area of stationary object
If multiple connection parts are used to connect touch sensing parts in both directions, then the touch sensing coverage is improved, but device complexity increases due to overlapping structures
Solution Approach 1:
The patent introduces asymmetry in the arrangement of connection parts. The first connection parts and second connection parts are positioned asymmetrically relative to each other, with the first connection parts extending in a first direction and the second connection parts extending in a second direction, creating a balanced yet non-overlapping configuration that maintains coverage while reducing complexity.
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A display apparatus includes a display panel and a touch sensing unit on the display panel. The touch sensing unit includes a plurality of first touch sensing parts arranged with each other along a first direction and having a mesh shape, a first connection part configured to connect adjacent ones of the first touch sensing parts from among the first touch sensing parts to each other along the first direction, a plurality of second touch sensing parts arranged with each other along a second direction crossing the first direction and having the mesh shape, and a second connection part configured to connect adjacent ones of the second touch sensing parts from among the second touch sensing parts to each other along the second direction. An insulation layer is located between the first connection part and the second connection part, and the first connection part extends to cross the adjacent ones of the second touch sensing parts.