Touch Display Panel Driving Method for In-Cell Sensitivity
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Solution Overview
Problem
In-cell capacitive touch display devices face issues with low sensitivity and report rate due to limited time for touch scanning within the image frame display period, affecting touch performance.
Innovation Solution
The method involves dividing the time period for each image frame into multiple control time periods, with both gate lines and touch scanning lines being driven within these periods, allowing for increased touch scanning opportunities and improved sensitivity by alternating the polarity of data voltages between adjacent display time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single display time period and single touch time period are used within each image frame, then the device complexity is low, but the touch sensitivity and report rate are limited
Solution Approach 1:
The patent divides each image frame into multiple control time periods (N control time periods where N≥2), with each control time period containing a display time period and a touch time period. This segmentation allows multiple touch scanning operations to be performed within a single image frame, thereby increasing touch sensitivity and report rate without requiring additional hardware complexity.
2Productivity
If multiple control time periods are used to increase touch scanning opportunities, then the touch report rate increases, but the time management complexity increases
Solution Approach 1:
The patent implements periodic alternation between display time periods and touch time periods within each control time period. This periodic structure allows the system to systematically switch between display and touch scanning functions, enabling multiple touch scanning cycles per image frame while maintaining manageable time period management through regular, predictable patterns.
Solution Approach 2:
The patent dynamically adjusts the allocation of time periods by allowing flexible configuration of N control time periods within each image frame. The system can adaptively manage the number and duration of display and touch time periods based on operational requirements, optimizing both report rate and time management efficiency.
3Speed
If touch scanning is performed within the display time period, then the touch response time decreases, but the display quality deteriorates due to electric field interference
Solution Approach 1:
The patent segments each control time period into distinct display time periods and touch time periods, ensuring that touch scanning operations occur during dedicated touch time periods rather than during display time periods. This temporal segmentation prevents electric field interference from touch scanning from affecting display quality, while still achieving fast touch response through multiple scanning opportunities per frame.
Data Source
AI summary
The present disclosure provides a method and a device for driving a touch display panel, and a touch display device. The touch display panel includes L gate lines and M touch scanning lines, where L and M are each a positive integer greater than 1. The method includes steps of: dividing a time period for displaying each image frame of the touch display panel into N control time periods, each of the N control time periods including a display time period and a touch time period, N being an even number equal to or greater than 2; and driving the L gate lines within the N display time periods and driving the M touch scanning lines in each touch time period in the time period for displaying each image frame of the touch display panel.