Touch Substrate Staggered Vias for Display Uniformity
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Solution Overview
Problem
In capacitive touch screens, the concentrated distribution of vias in the insulating layer leads to brightness mura and regular display unevenness, affecting the accuracy and reliability of touch signals.
Innovation Solution
The touch substrate incorporates a design with touch lines and dummy touch lines in the same layer, where touch electrodes are coupled to both types of lines through vias distributed in a staggered and dispersed manner, avoiding concentrated via distribution and enhancing signal transmission and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vias are concentratedly distributed in the insulating layer to connect touch electrodes and signal lines, then electrical connection is achieved, but brightness mura and display unevenness occur
Solution Approach 1:
The patent divides the via distribution into multiple groups (first vias and second vias) that are spatially separated and staggered. Instead of having all vias concentrated in one location, they are segmented into different regions, which prevents the formation of bright spots or mura while maintaining reliable electrical connection between touch electrodes and signal lines.
Solution Approach 2:
The patent applies different via distribution patterns in different local regions. The first vias are positioned at first positions and the second vias are positioned at second positions that are offset from the first positions. This local variation in via placement ensures uniform light transmission across different areas of the display while maintaining electrical connectivity.
2Ease of manufacture
If multiple signal lines are arranged in the same layer to reduce manufacturing complexity, then manufacturing process is simplified, but signal interference may increase
Solution Approach 1:
The patent segments signal lines into different functional types (touch lines and dummy touch lines) that are arranged in the same layer but with distinct spatial patterns. This segmentation allows for simplified manufacturing through single-layer processing while the staggered via arrangement prevents signal interference by separating the electrical connection paths.
3Measurement precision
If touch electrodes are coupled to both touch lines and dummy touch lines through dispersed vias, then touch accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of touch signal transmission and display uniformity maintenance into a single via structure design. The same first and second vias that provide electrical connection also serve to prevent brightness mura, eliminating the need for separate structures and reducing overall device complexity despite the enhanced functionality.
Data Source
AI summary
A touch substrate includes a base, a plurality of touch electrodes arranged in an array on the base, and a plurality of signal lines disposed on a side of the plurality of touch electrodes proximate to or away from the base. The plurality of signal lines include a plurality of touch lines and a plurality of dummy touch lines. At least one of the plurality of touch electrodes is coupled to at least one of the plurality of touch lines. The at least one touch line is configured to transmit touch signals. The at least one touch electrode is coupled to at least one of the plurality of dummy touch lines.