Touch Signal Line Layout for Display Panel Visibility Reduction
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Solution Overview
Problem
Display devices with touch sensors often exhibit visible touch lines, which detract from image quality and user experience by creating visual imperfections on the screen.
Innovation Solution
The design incorporates a touch sensor layout with angled and serpentine touch signal lines, dummy electrodes, and strategically placed openings to minimize visibility, featuring a combination of overlapping and angled line configurations that reduce line density and enhance aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch signal lines are arranged in a regular grid pattern, then manufacturing is simple, but the lines become visible and degrade image quality
Solution Approach 1:
The touch signal lines are designed with serpentine (curved) patterns instead of straight lines. The lines include first line portions extending in a first direction and second line portions extending in a second direction intersecting the first direction, creating a curved, non-linear path that reduces visibility while maintaining electrical connectivity between touch electrodes and touch pads.
Solution Approach 2:
Adjacent touch signal lines are designed with asymmetric configurations where the first line portions have different lengths in the first direction. This asymmetric arrangement breaks the regular grid pattern that causes visibility issues, making each line unique in its path and reducing the overall visibility of the touch signal line network.
2Reliability
If touch signal lines are made longer to connect electrodes, then connectivity is improved, but line density increases and visibility worsens
Solution Approach 1:
The touch signal lines utilize two-dimensional space by extending in multiple directions (first direction and second direction intersecting at angles). Instead of simply lengthening lines in one direction, the design employs angular deviations and multi-directional extensions to achieve connectivity while distributing line density across different spatial dimensions, reducing visibility.
3Measurement precision
If touch signal lines are arranged densely to cover the display area, then touch sensitivity is improved, but line visibility increases
Solution Approach 1:
The touch signal lines are segmented into distinct portions (first line portions and second line portions) with different orientations and lengths. This segmentation allows the lines to be distributed more effectively across the display area, maintaining touch sensing coverage while reducing the density in any single location, thereby minimizing visibility.
Data Source
AI summary
A display device includes: a display panel having a display area and a non-display area at least partially disposed around the display area; and a touch sensor disposed on the display panel and including a touch sensor area in the display area and a touch peripheral area in the non-display area adjacent to the touch sensor area, wherein the touch sensor includes: a first touch electrode and a second touch electrode; a first touch pad and a second touch pad being adjacent to each other in a first direction; a second touch pad disposed in a touch pad area of the touch peripheral area; a first touch signal line electrically connecting the first touch electrode with the first touch pad, the first touch signal line including a first line portion extended in the first direction and a second line portion extended in a second direction; a second touch signal line electrically connecting the second touch electrode with the second touch pad; a first dummy line extended in the first direction and spaced apart from the first and second touch signal lines; and a second dummy line extended in the first direction and spaced apart from the first and second touch signal lines.