Touch Panel Driving Pulse Control for Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In half source driver touch panels, the time interval between driving signals is shorter than in 60 Hz frame rate touch panels, causing interference from data coupling areas, which hinders accurate touch detection due to inconsistent common voltages.
Innovation Solution
Synchronizing the timing of gate lines and touch sensors, determining the consistency of common voltage polarities between adjacent gate lines, and outputting driving pulses only in non-data coupling areas to reduce interference and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the time interval between driving signals is reduced to enable half source driver operation, then the refresh rate and productivity are improved, but the common voltage becomes unstable during data coupling area, causing touch detection inaccuracy
Solution Approach 1:
The patent applies preliminary action by detecting the common voltage stability before transmitting the driving pulse to the touch sensor. The system checks whether the common voltage of the display panel is stable during the data coupling area before initiating touch detection, and only transmits the driving pulse when the voltage is confirmed stable, thereby avoiding inaccurate touch detection caused by voltage fluctuations
Solution Approach 2:
The patent implements feedback by continuously monitoring the common voltage stability during the data coupling area and using this information to control whether to transmit the driving pulse. The system feeds back the voltage stability status to the control logic, which adjusts the driving pulse transmission accordingly, ensuring touch detection accuracy while maintaining high refresh rate operation
2Speed
If the time interval between driving signals is reduced for half source driver operation, then the device can operate at higher frame rates, but the data coupling area interferes with touch sensor detection
Solution Approach 1:
The patent applies the taking out principle by extracting the harmful interference from the data coupling area. The system identifies the data coupling area as the source of interference and separates the touch detection operation from this period. By detecting common voltage stability specifically during the data coupling area and using this information to control driving pulse transmission, the system effectively removes the harmful interference from the touch detection process
Solution Approach 2:
The patent uses preliminary action by performing common voltage detection before the potential interference occurs. The system detects whether the common voltage is stable during the data coupling area in advance, and based on this preliminary detection, decides whether to transmit the driving pulse, thereby preventing interference from affecting touch detection accuracy
Data Source
AI summary
A method for controlling operations of a touch panel includes synchronizing timing of a plurality of gate lines and timing of a plurality of touch sensors; determining whether polarities of common voltages of a display layer are consistent when driving signals are outputted to a first gate line and a second gate line, the second gate line following the first gate line; and if the polarities are consistent, outputting at least one driving pulse to a touch sensor of the plurality of touch sensors after image data corresponding to the second gate line is transmitted to the display layer.