Display Panel Touch Signal Noise Reduction via Driving Circuit
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Solution Overview
Problem
The existing display panels suffer from low touch signal-to-noise ratio due to strong interference between the display electrode signals and the touch electrode signals, particularly when the display electrode signals switch between high and low levels.
Innovation Solution
A display panel with a first driving circuit that generates a touch electrode signal based on the display electrode signal, ensuring that the touch electrode signal is turned off at the potential jump position of the display electrode signal, thus avoiding interference from the display electrode signal's switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display electrode signal switches between high and low levels to drive the display, then the display function is achieved, but strong interference is generated to the touch signal resulting in low touch signal-to-noise ratio
Solution Approach 1:
The patent applies periodic action by synchronizing the touch electrode signal with the display electrode signal's periodic switching. The touch electrode signal is turned on during the high level period and turned off during the low level period, creating a periodic on-off pattern that avoids interference during the switching transitions while maintaining display functionality throughout the cycle
Solution Approach 2:
The patent implements preliminary action by turning off the touch electrode signal in advance before the display electrode signal switches to the low level. This preliminary turn-off prevents the touch signal from being interfered with during the switching transition, ensuring clean touch signal measurement before the interference occurs
Data Source
AI summary
A display panel includes a first driving circuit; a display electrode layer, and a touch electrode layer. The first driving circuit is configured to obtain a display electrode signal from the display electrode layer and generate a touch electrode signal provided to the touch electrode layer according to the display electrode signal. A potential jump position of the display electrode signal is in an off-stage of the touch electrode signal.