Array Substrate Touch Line Layout for ESD-Safe Large Panels
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Solution Overview
Problem
In large-size touch panels, the arrangement of touch signal lines and their connection to control units is challenging due to limited space and high density of touch sensor blocks, leading to difficulties in maintaining electrostatic protection and preventing short circuits.
Innovation Solution
The array substrate design includes two groups of touch signal lines arranged in opposite directions with electrostatic protection distances, coupled to respective control units, and features alternating linear and curved portions to reduce parasitic capacitance and prevent electrostatic discharge, allowing for efficient space utilization and improved aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch signal lines are arranged densely to connect all touch sensor blocks in large-size touch panels, then the coverage and connectivity are improved, but the risk of electrostatic discharge and short circuits increases
Solution Approach 1:
The touch signal lines are divided into two separate groups: first touch signal lines extending in a first direction and second touch signal lines extending in a second direction. This segmentation allows each group to be optimized independently, reducing the density and electrostatic risk in any single direction while maintaining overall coverage of all touch sensor blocks.
Solution Approach 2:
The patent transitions from a single-direction signal line arrangement to a two-dimensional arrangement where signal lines extend in multiple directions (first direction and second direction). This dimensional change distributes the signal lines more evenly across the panel, reducing local density and electrostatic discharge risk while improving overall connectivity.
2Device complexity
If traditional single-direction touch signal line arrangement is used, then the layout is simple, but the aperture ratio of subpixels deteriorates due to space waste
Solution Approach 1:
The patent employs bidirectional signal line arrangement (first direction and second direction) to utilize space more efficiently. This allows signal lines to be positioned along subpixel boundaries more effectively, reducing the space occupied by signal lines within active pixel areas and thereby improving aperture ratio while maintaining manageable layout complexity.
Solution Approach 2:
Different regions of the display panel utilize different signal line extension directions optimized for local subpixel arrangements. This local optimization allows signal lines to follow subpixel boundaries more closely in different areas, maximizing the use of available space and improving overall aperture ratio without requiring complete redesign of the entire layout.
3Adaptability or versatility
If touch signal lines are arranged to cover all touch sensor blocks, then the touch detection capability is improved, but the complexity of signal line arrangement increases
Solution Approach 1:
The touch signal line network is segmented into two orthogonal groups (first direction and second direction), each responsible for connecting touch sensor blocks along its extension direction. This segmentation simplifies the arrangement complexity by breaking down the comprehensive coverage requirement into two manageable directional components, while collectively maintaining full touch detection capability.
Data Source
AI summary
An array substrate and a touch display device are provided. In the array substrate, a first control unit and a second control unit are arranged opposite to each other in a first direction. A plurality of touch sensor blocks includes a first group of electrode blocks and a second group of electrode blocks arranged in the first direction, and a plurality of touch signal lines includes a first group of touch signal lines and a second group of touch signal lines arranged in the first direction. The touch signal lines in the first group of touch signal lines are coupled to the touch sensor blocks in the first group of electrode blocks respectively; and the touch signal lines in the second group of touch signal lines are coupled to the touch sensor blocks in the second group of electrode blocks respectively.