Touch Sensor Routing Around Display Openings for Uniform Sensing
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Solution Overview
Problem
Touch sensors in display devices face challenges in maintaining sensing sensitivity and uniformity due to openings for electronic components, leading to increased electrical influence and reduced accuracy.
Innovation Solution
The implementation of routing lines at both ends of sensor electrodes separated by openings, along with shielding electrodes and connection patterns, minimizes line density in peripheral regions and ensures uniform touch sensing across the active area without adding additional routing lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If routing lines are added to connect sensor electrodes separated by openings, then electrical connection is improved, but line density in peripheral regions increases causing electrical interference
Solution Approach 1:
The routing lines are divided into multiple segments distributed at both ends of the sensor electrodes separated by the opening. Instead of concentrating all connections in one location, the lines are segmented and placed strategically at different peripheral areas, reducing local line density and electrical interference while maintaining reliable electrical connection to all sensor electrodes.
Solution Approach 2:
The patent applies different line configurations to different regions. Routing lines are disposed at both ends of the sensor electrodes with specific spacing arrangements in different peripheral areas. This local differentiation optimizes electrical connection in each region while minimizing interference, rather than using a uniform approach throughout.
2Reliability
If more routing lines are added to maintain sensing coverage, then touch sensing coverage is improved, but design space in peripheral region is reduced
Solution Approach 1:
The routing lines are segmented and distributed at both ends of the sensor electrodes rather than concentrated in one area. This segmentation allows comprehensive touch sensing coverage across the entire active region while distributing the line density, thereby preserving design space in the peripheral regions for other components.
3Object-affected harmful factors
If shielding electrodes are added between routing lines, then electrical interference is reduced, but device complexity increases
Solution Approach 1:
Shielding electrodes are introduced as intermediary elements disposed between the routing lines in the peripheral regions. These shielding electrodes act as mediators that block or reduce electrical interference between adjacent routing lines, improving signal quality while adding a relatively simple structural element that can be integrated into the existing layout.
Data Source
AI summary
A touch sensor includes: a plurality of first sensor electrodes, each including first sensor patterns extending in a first direction, and being arranged in a second direction; a plurality of second sensor electrodes, each including second sensor patterns extending in the second direction and being arranged in the first direction; an opening in a touch active region separated from the first and second sensor electrodes; a first connection pattern disposed around but not in the opening, the first pattern electrically connecting first opening sensor patterns of the first sensor patterns that are adjacent to respective portions of the opening in the second direction; first lines respectively connected to portions of the first sensor electrodes, the first lines extending to a periphery of the touch active region; and second lines respectively connected to portions of the second sensor electrodes, the second lines extending to the periphery of the touch active region.