Touch Display Panel Driving Method for Faster Response
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Solution Overview
Problem
In in-cell touch screens, the time division method for driving display and touch operations results in a longer display time and shorter touch time, limiting touch response speed, as the touch driving frequency is not sufficient to meet increasing user demands for faster response times.
Innovation Solution
The method involves dividing the frame display duration into N control time intervals, with each interval including a display refresh time and a touch time, allowing for sequential driving of gate lines and touch scan lines, thereby increasing touch driving frequency by feeding back touch driving signals to external chips across multiple frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the frame display duration is divided into equal time intervals for display and touch operations, then the display operation can be completed, but the touch operation time becomes insufficient as resolution increases
Solution Approach 1:
The frame display duration is divided into N control time intervals, where each interval includes a display refresh time and a touch time. This segmentation allows the system to perform touch operations multiple times within a single frame duration, increasing touch driving frequency while maintaining display quality.
Solution Approach 2:
The patent implements periodic touch operations by repeating the touch scan process K times (where K>1) within each control time interval. This periodic action increases the touch driving frequency without extending the overall frame duration, resolving the time conflict between display and touch operations.
2Speed
If the scan frequency of touch operation is increased to improve touch response speed, then touch response speed improves, but the time for display operation becomes insufficient
Solution Approach 1:
The patent introduces a new time dimension by utilizing the vertical synchronization period and horizontal synchronization period separately. By driving touch scan lines during the horizontal synchronization period when display data is not being scanned, the system increases touch driving frequency without reducing display operation time in the vertical dimension.
Solution Approach 2:
The system dynamically adjusts the timing of touch and display operations by dividing the frame duration into multiple control time intervals. This dynamic time management allows flexible allocation of time resources, enabling high-frequency touch operations while ensuring complete display refresh cycles.
3Productivity
If touch operations are performed during display time, then touch driving frequency increases, but display data signal noise and power supply interference noise are captured
Solution Approach 1:
The patent extracts the touch operation timing from the display data scanning period and places it in the horizontal synchronization period. This separation removes touch operations from the noisy display data environment, eliminating noise capture while maintaining high touch driving frequency.
Solution Approach 2:
The horizontal synchronization signal serves as an intermediary time window that enables touch operations without interfering with display data scanning. This intermediary period acts as a buffer that isolates touch operations from display-related noise sources.
Data Source
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AI summary
The present disclosure relates to a touch display panel, a method and a device for driving the touch display panel. The method is applied to the touch display panel which includes L gate lines arranged sequentially and M touch scan lines arranged sequentially, where both L and M are positive integers larger than 1. The method includes dividing a duration for which the touch display panel displays each frame of image into N control time intervals with each of the N control time intervals including a display refresh time and a touch time arranged sequentially, where N is an integer larger than 1; during the duration for which the touch display panel displays each frame of image, driving the L gate lines sequentially in N display refresh times, and driving the M touch scan lines sequentially for K times in N touch times, where K is larger than 1.