Touch Driving Circuit for Display Panel Vertical Stripes
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Solution Overview
Problem
In existing touch screen displays, the common electrode is often divided into multiple touch electrodes, leading to different potentials among them, causing vertical stripes and degraded display performance when switched to the display stage.
Innovation Solution
A display panel with a plurality of touch driving electrodes and at least one touch driving circuit that drives the panel to enter multiple touch stages within a frame period, providing a touch scanning signal to one electrode while maintaining a common voltage signal for the others, ensuring all electrodes have equal potential during touch stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode is divided into multiple touch electrodes for touch detection, then touch detection capability is improved, but potential differences appear among electrodes causing vertical stripes and degraded display performance
Solution Approach 1:
The patent applies equipotentiality by maintaining all non-selected touch electrodes at the same common voltage potential during touch detection stages. This is achieved through the touch driving circuit that selectively connects touch electrodes to either the touch detection signal line or the common voltage signal line, ensuring that electrodes not currently being scanned remain at equal potential, thereby eliminating potential differences that cause vertical stripes while preserving touch detection functionality
Solution Approach 2:
The patent implements dynamics by dynamically switching the connection state of touch electrodes between different stages. During display stages, all touch electrodes are connected to the common voltage signal line to maintain equipotentiality for display quality. During touch detection stages, one electrode is dynamically selected to receive the touch detection signal while others remain connected to the common voltage line, allowing the system to adapt its configuration based on operational requirements
2Ease of operation
If touch electrodes are independently switched during touch stage, then touch detection is enabled, but potential differences cause vertical stripes on display screen
Solution Approach 1:
The patent eliminates vertical stripes by maintaining equipotentiality among all non-selected touch electrodes through connecting them to the common voltage signal line during touch detection stages. This ensures that no potential differences exist between electrodes that are not currently being scanned, preventing the formation of vertical stripes while still allowing individual electrode selection for touch detection
Solution Approach 2:
The patent introduces the common voltage signal line as an intermediary between the touch electrodes and the voltage source. This intermediary ensures that all non-selected electrodes receive the same common voltage, acting as a mediator that equalizes potentials across multiple electrodes and prevents the harmful effect of potential differences during the transition between touch and display stages
Data Source
AI summary
A display panel, a driving method, and a display panel are provided. The display panel comprises a plurality of touch driving electrodes, and at least one touch driving circuit electrically connected to the plurality of touch driving electrodes. The at least one touch driving circuit drives the display panel to enter a plurality of touch stages in one frame period, in which the one frame period includes a plurality of touch stages and a plurality of display stages. In a touch stage, the at least one touch driving circuit provides a touch scanning signal to one of the plurality of touch driving electrodes and, meanwhile provides a common voltage signal to the other touch driving electrodes.