In-Cell Touch Array Substrate Narrow Bezel Routing
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Solution Overview
Problem
Existing In-Cell touch display devices face challenges in designing a no-bezel or narrow bezel due to the requirement for a larger width in the bezel area to accommodate touch signal lines.
Innovation Solution
The array substrate is designed with touch signal lines arranged between adjacent columns of pixel units, eliminating the need for a significant bezel area or allowing only a small space for touch signal lines, featuring strip-shaped touch electrodes connected to touch signal lines and a common electrode configuration with time-shared voltage and scanning signals, and utilizing connection bridges with insulating layers at intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch signal lines are arranged in the bezel area, then the device structure is simple, but the bezel width increases
Solution Approach 1:
The patent transitions the arrangement dimension of touch signal lines from the horizontal bezel area to the vertical space between pixel columns. By utilizing the inter-column space in the display area, the signal lines are routed through a previously underutilized dimension, eliminating the need for extended bezel width while maintaining structural simplicity.
Solution Approach 2:
The patent segments the touch signal line routing into two distinct paths: signal lines for first touch electrodes are arranged between first pixel columns, while signal lines for second touch electrodes are arranged between second pixel columns. This segmentation allows independent optimization of each signal line group and enables compact integration without bezel extension.
2Ease of manufacture
If a larger bezel area is reserved, then touch signal lines can be accommodated easily, but the display area utilization decreases
Solution Approach 1:
The space between pixel columns, which traditionally serves only as a structural separator, is repurposed to simultaneously function as a routing channel for touch signal lines. This multi-functional utilization of inter-column space eliminates the need for dedicated bezel area for signal line accommodation, thereby maximizing display area utilization while maintaining ease of signal line integration.
3Length of stationary object
If touch signal lines are arranged between pixel columns, then the bezel width is reduced, but the wiring space becomes constrained
Solution Approach 1:
The patent implements a nested arrangement where touch signal lines are embedded within the vertical spacing between adjacent pixel columns. The signal lines are positioned in the inter-column gaps, effectively nesting the wiring within the existing pixel structure rather than requiring additional external space. This nested configuration provides sufficient wiring space while minimizing bezel width.
Data Source
AI summary
An embodiment of the present invention provides an array substrate, comprising a plurality of pixel units arranged in a matrix manner and a plurality of strip-shaped touch electrodes arranged between adjacent rows of pixel units, respectively, each touch electrode being connected with a corresponding one of a plurality of touch signal lines, at least part of the plurality of touch signal lines being arranged between adjacent columns of pixel units, respectively. Embodiments of the present invention also provide a touch panel comprising the array substrate and a display device comprising the touch panel.