Touch Electrode Layout Around Display Openings for Stable Sensing
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Solution Overview
Problem
Existing full-screen display technologies face challenges in maintaining effective touch performance and user experience due to the placement of imaging sensors and sensors in notches or holes, leading to reduced touch sensitivity, signal interference, and electrostatic issues in the small regions surrounding the openings.
Innovation Solution
A touch sensor design with specific electrode configurations and layouts, including first and second touch electrodes arranged in intersecting directions, and connecting sub-electrodes to surround the opening region, along with a polarizer and adhesive layers to manage signal transmission and electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If imaging sensors and sensors are placed in notches or holes to achieve full-screen display, then screen-to-body ratio is improved, but touch sensitivity and signal quality deteriorate in surrounding regions
Solution Approach 1:
The patent applies local quality by configuring touch electrodes with non-uniform spacing and varying areas in different regions. Specifically, touch electrodes in regions adjacent to opening regions have smaller areas and larger spacing compared to central regions, compensating for the degraded touch sensitivity caused by openings. This localized adjustment of electrode parameters maintains overall touch performance while preserving the full-screen display effect.
Solution Approach 2:
The patent employs asymmetry by positioning opening regions at specific locations (e.g., top center) and adjusting touch electrode configurations asymmetrically around these openings. The touch electrodes are arranged with different spacing and dimensions on different sides of the opening, optimizing touch sensitivity in each local region while maintaining the aesthetic and functional requirements of the full-screen display.
2Area of stationary object
If touch electrodes are placed close to opening regions to maintain touch coverage, then touch coverage is improved, but electrostatic interference and signal noise increase
Solution Approach 1:
The patent applies local quality by implementing region-specific electrode designs. Touch electrodes adjacent to opening regions have modified dimensions and spacing to account for the increased electrostatic interference. The electrode area is reduced and spacing is increased in these vulnerable regions, while central regions maintain denser electrode configurations for optimal touch resolution. This localized differentiation balances touch coverage with interference mitigation.
3Reliability
If touch electrode area is increased to improve touch sensitivity, then touch sensitivity is improved, but device thickness and complexity increase
Solution Approach 1:
The patent applies local quality by varying touch electrode dimensions across different regions rather than using uniform electrode sizes throughout. Touch electrodes in central regions have larger areas for high sensitivity, while electrodes near opening regions have smaller areas to avoid excessive thickness and complexity. This spatially differentiated electrode design optimizes touch sensitivity where needed while controlling overall device complexity.
Data Source
AI summary
A touch sensor and a display apparatus are disclosed. The touch sensor includes a first opening region, first touch electrodes and second touch electrodes. The first touch electrodes respectively extend along a first direction, and at least one of the first touch electrodes includes first touch sub-electrodes arranged side by side in the first direction and electrically connected with each other; the second touch electrodes respectively extend along a second direction, and at least one of the second touch electrodes includes second touch sub-electrodes arranged side by side in the second direction and electrically connected with each other; an area of a first touch sub-electrode in the first region is less than that of a first touch sub-electrode in the third region, or an area of a second touch sub-electrode in the first region is less than that of a second touch sub-electrode in the third region.