Display Substrate Common Voltage Layout for Touch Crosstalk Isolation
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Solution Overview
Problem
In display devices with integrated touch functionality, high-frequency impulse voltage signals used for touch recognition often cause coupling disturbances to other signal lines, leading to inaccurate signal transmission and compromised display quality.
Innovation Solution
The display substrate incorporates a first and second common voltage line in the peripheral area, surrounded by an integrated circuit that provides identical display signals during the display stage and identical touch signals during the touch stage, ensuring consistent signal transmission without coupling disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frequency impulse voltage signals are used for touch recognition, then touch sensitivity is improved, but coupling disturbances to other signal lines occur leading to inaccurate signal transmission
Solution Approach 1:
The patent introduces common voltage lines as intermediary elements that mediate between the touch signal lines and the display signal lines. These common voltage lines act as a buffer zone, receiving both touch and display signals simultaneously to equalize potential differences and prevent coupling disturbances. This intermediary structure allows high-frequency impulse voltage signals to be used for touch recognition while maintaining accurate signal transmission by providing a reference potential that isolates the two signal types.
2Reliability
If multiple separate signal lines are used for touch and display functions, then signal transmission accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing common voltage lines that serve dual purposes: they provide reference potentials for display signal transmission and simultaneously serve as signal lines for touch recognition. This universal structure allows the same physical infrastructure to support both touch and display functions, reducing the total number of separate signal lines needed while maintaining signal transmission accuracy through proper potential equalization.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate has a display area and a peripheral area surrounding the display area. The display substrate includes a first common voltage line, a second common voltage line and an integrated circuit. The first common voltage line is provided in the peripheral area and at least partially surrounds the display area; the second common voltage line is provided in the peripheral area, located on a side of the first common voltage line away from the display area, and at least partially surrounds the display area; the integrated circuit is provided in the peripheral area, and located on a first side of the display area, configured to provide first signals to the first and second common voltage line during a display stage, and provide second signals to the first and second common voltage line during a touch stage.