Boundary Touch Routing Structure for Narrow-Bezel Display Panels
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Solution Overview
Problem
The integration of touch electrodes and routing lines in display devices increases the non-display area, leading to larger bezels and potential issues with noise coupling and resistance differences between touch channels.
Innovation Solution
A display device design with touch routing lines that include a first single line portion and a first double line portion, non-overlapping with signal lines, and a common electrode configuration that reduces the non-display area and improves touch driving and sensing quality while minimizing noise and resistance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch routing lines are disposed in the non-display area, then touch electrode connections are achieved, but the non-display area size increases
Solution Approach 1:
The patent transitions the touch routing lines from the non-display area (2D plane) to the display area boundary (1D line structure), effectively changing the spatial dimension of routing line placement. This allows routing lines to be positioned along the perimeter of the display area rather than occupying non-display area, thereby reducing bezel size while maintaining electrical connections.
Solution Approach 2:
The touch routing lines are divided into multiple segments including first routing lines, second routing lines, third routing lines, and fourth routing lines. These segmented routing lines are strategically positioned at different locations along the display area boundary, allowing optimized path routing that minimizes the required non-display area while ensuring proper electrical connections to all touch electrodes.
2Ease of manufacture
If touch routing lines are placed in non-display area, then electrical connections are established, but coupling noise between touch channels increases
Solution Approach 1:
The patent extracts the touch routing lines from the non-display area and repositions them along the display area boundary. This separation removes the routing lines from the region where they would otherwise be in close proximity to each other, thereby reducing capacitive coupling and noise interference between adjacent touch channels while preserving all necessary electrical connections.
3Ease of manufacture
If traditional touch routing line structure is used, then touch electrode connections are achieved, but resistance difference between touch channels increases
Solution Approach 1:
The patent implements different routing line configurations for different regions of the display area. Specific routing lines are positioned at optimized locations along the boundary, and the routing paths are designed with varying geometries tailored to each touch electrode's position. This localized optimization ensures that all touch channels achieve similar resistance values despite their different physical locations on the display.
Data Source
AI summary
A display device including a substrate, touch electrodes on the substrate and located in the display area, touch pads on the substrate and located in the non-display area, and touch routing lines on the substrate, electrically interconnecting the touch electrodes and the touch pads, and in a portion of an outer edge of the display area. The touch routing lines may include a first touch routing line for electrically connecting a first touch electrode to a first touch pad, and an nth touch routing line for electrically connecting an nth touch electrode to an nth touch pad. The first touch routing line may include a first single line portion and a first double line portion, which are electrically connected to each other, and the first single line portion may be electrically connected to the first touch electrode through the first double line portion.