In-Cell Multi-Touch Panel Driving Method for Display Interference Reduction
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Solution Overview
Problem
In-cell multi-touch panels experience display interference due to the coupling effect between touch driving signals and display frames, leading to irregular display frames and increased power consumption.
Innovation Solution
A driving method that synchronizes display and touch frames with a different sequence of touch driving signals provided to touch driving lines in each frame, using a touch display control subsystem with a touch controller and display driver to manage the touch driving signals and sensing lines, ensuring the touch driving signal sequence varies in each touch frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch driving signal is provided sequentially in the same order in each frame, then the control is simple and stable, but the coupling effect causes irregular display frames and increased power consumption
Solution Approach 1:
The patent applies dynamics by making the touch driving signal provision order variable rather than fixed. The control unit changes the sequence in which touch driving signals are provided to different touch driving lines in successive frames, creating a dynamic scanning pattern that reduces coupling effects and power consumption while maintaining display stability.
2Reliability
If the touch driving signal is provided to all touch driving lines in each frame, then the touch sensing coverage is complete, but the display interference increases due to coupling effects
Solution Approach 1:
The patent segments the touch driving signal provision process by dividing touch driving lines into different groups that are activated in different frames. Instead of providing signals to all lines simultaneously in a fixed order, the system divides the scanning process across multiple frames with varying sequences, reducing the coupling effect and display interference while maintaining complete touch sensing coverage.
3Reliability
If the gate working interval of display is separated from touch driving operating interval, then the displaying and touch sensing can be driven concurrently without mutual interference, but the frame rate is limited and time sharing is required
Solution Approach 1:
The patent applies periodic action by implementing a frame-based scanning mechanism where touch driving signals are provided in a periodic manner across different frames. The control unit systematically varies the scanning sequence in each frame while maintaining a regular frame rate, allowing concurrent display and touch sensing operations at 60Hz without mutual interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method reduces display interference and saves power by averaging frame disturbances through non-sequential touch driving signal provision, maintaining display quality and reducing perceived interference.
Implementation Method 1
a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes and a human body to generate a current or voltage for detecting touching coordinates
Implementation Method 2
The touch controller 321 provides a touch driving signal to the N touch driving lines and receives touch signals from the M sensing lines
Data Source
AI summary
In a driving method for reducing display interference in in-cell multi-touch panel, a display driving signal is provided to K gate lines and a display image signal is provided to L source lines so as to drive corresponding transistors and capacitors in a display frame for displaying an image. The method also provides a touch driving signal to N touch driving lines and receives touch signals from M sensing lines to thereby detect one or more touch point positions of an external object in a touch frame based on the touch driving signal. In each touch frame, a sequence of providing the touch driving signal to N touch driving lines is different.