Touch Substrate Signal Routing for Uniform Sensitivity
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Solution Overview
Problem
Conventional self-capacitive touch screens experience reduced sensitivity and signal loss due to the higher resistivity of touch electrodes, leading to inconsistent touch detection across the screen, especially when using tools with small contact areas like styluses, as the conductive material for touch electrodes has weaker conductivity compared to gate and data lines, resulting in poor user experience.
Innovation Solution
The touch substrate design includes a plurality of touch electrodes connected to both first and second touch signal lines via via holes, where the second touch signal lines are oriented differently to prevent interference and utilize a material with lower resistivity, ensuring signal transmission efficiency by routing signals through shorter paths with better conductivity, thereby maintaining consistent sensitivity across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If touch electrodes are made with transparent conductive material, then transparency is maintained, but conductivity is reduced leading to signal loss
Solution Approach 1:
The touch signal line is divided into two separate lines (first touch signal line and second touch signal line) that extend in different directions. This segmentation allows the signal to be transmitted through multiple paths, compensating for the high resistivity of transparent conductive materials while maintaining transparency of the touch electrode.
Solution Approach 2:
The patent introduces a second touch signal line extending in a direction different from the first touch signal line. This dimensional change creates additional signal transmission paths in different spatial directions, reducing signal loss caused by the high resistivity of transparent conductive materials.
2Device complexity
If single-direction touch signal lines are used, then device complexity is reduced, but signal loss increases due to longer transmission paths
Solution Approach 1:
The patent introduces a second touch signal line extending in a direction different from the first touch signal line. This dimensional change creates additional signal transmission paths in different spatial directions, reducing signal loss caused by the high resistivity of transparent conductive materials.
Solution Approach 2:
Different regions of the touch electrode are connected to signal lines in different directions. The first touch signal line extends in a first direction and the second touch signal line extends in a second direction different from the first direction, optimizing signal transmission locally across different areas of the touch screen.
3Ease of manufacture
If touch signal lines extend in the same direction, then manufacturing is simplified, but interference between adjacent signal lines increases
Solution Approach 1:
The patent makes the arrangement asymmetric by having the first touch signal line extend in a first direction and the second touch signal line extend in a second direction different from the first direction. This asymmetric arrangement in different directions reduces electromagnetic interference between adjacent signal lines compared to parallel same-direction arrangements.
Data Source
AI summary
Embodiments of the present disclosure provide a touch substrate, including: a plurality of touch electrodes arranged in a same layer and insulated from each other, the touch electrodes being configured to sense touch signals; and a plurality of first touch signal lines configured to transmit the touch signals, each touch electrode being connected with a corresponding first touch signal line via a first via hole. The touch substrate further includes a plurality of second touch signal lines, wherein an extension direction of the second touch signal lines is different from that of the first touch signal lines, and each touch electrode is connected with a corresponding second touch signal line via a second via hole. In particular, the second touch signal lines corresponding to different touch electrodes are disconnected from each other. Embodiments of the present disclosure further provide a touch screen including the touch substrate.