Array Substrate Touch Layout Aligning Same-Color Access Points
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Solution Overview
Problem
In in-cell touch display technology, the integration of touch signal lines on the glass substrate leads to vertical stripes due to differing RC loadings and sensitivities of sub-pixels, causing display non-uniformity (Mura) due to inconsistent access points of touch signal lines across different sub-pixels.
Innovation Solution
The array substrate design ensures that access points of touch signal lines connected to the same row of touch sensor units are in the same sub-pixel color environment, optimizing the RC loadings and reducing sensitivity differences by aligning access points with the same sub-pixel color, thereby minimizing display non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch signal lines are integrated on the glass substrate with access points in different sub-pixel colors, then touch functionality is achieved, but vertical stripes and display non-uniformity occur due to inconsistent RC loadings
Solution Approach 1:
The patent applies local quality by making the access points of touch signal lines in the same row consistently located in sub-pixels of the same color (e.g., all in red sub-pixels or all in blue sub-pixels). This localized consistency in access point positioning ensures uniform RC load characteristics across touch signal lines, eliminating the vertical stripe phenomenon while preserving touch functionality.
2Quantity of substance
If access points of touch signal lines are distributed across different sub-pixel colors, then sub-pixel utilization is maximized, but RC loading differences cause sensitivity variations and Mura effect
Solution Approach 1:
The patent changes the parameter of access point color distribution from diverse (different colors) to uniform (same color). By standardizing the sub-pixel color environment for all access points in a row, the RC loading parameters become consistent, eliminating sensitivity variations and Mura effects while maintaining effective use of sub-pixels through systematic arrangement.
3Adaptability or versatility
If touch signal lines connect to different colored sub-pixels, then connection diversity is achieved, but vertical stripes appear with periodicity matching access point patterns
Solution Approach 1:
The patent segments the touch signal line connections by organizing them into distinct groups where each group's access points are located in sub-pixels of the same color. This segmentation approach allows different touch signal lines to have different connection patterns (maintaining diversity) while ensuring that within each row, all access points follow the same color pattern (eliminating periodic vertical stripes).
Data Source
AI summary
The present disclosure provides an array substrate and a touch display device. The array substrate includes: a plurality of pixels arranged in an array, each pixel includes N sub-pixels of different colors arranged along a first direction, and N≥3; a plurality of touch sensor units arranged in an array, each touch sensor unit corresponds to m*N sub-pixels in the first direction, and m is a positive integer; a plurality of touch signal lines, each touch sensor unit is connected with at least one touch signal line. Along the first direction, each touch sensor unit in a same row is connected with a same number of touch signal lines, each touch signal line is connected with a corresponding touch sensor unit through an access point, and the access points of the touch signal lines connected to a same row of touch sensor units are in a same sub-pixel color environment.