Touch Display Panel Simultaneous Scanning Voltage Compensation
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Solution Overview
Problem
Conventional embedded touch technology in intelligent terminals faces interference between display and touch signals, leading to a shortened display period and compromised display effect due to time-sharing scanning methods.
Innovation Solution
A driving method and device for touch display panels that include a voltage detection circuit, a compensation noise-deduction circuit, and a touch pulse processing circuit, which detect and negate voltage potentials of pixel electrodes to enhance touch pulse signal precision without affecting display performance by adjusting feed-backed touch pulse signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If time-sharing scanning method is used to separate display and touch periods, then mutual interference between display and touch is reduced, but the display period is shortened and storage capacitor charging time is reduced
Solution Approach 1:
The patent merges display scanning and touch scanning into a simultaneous operation by applying different scanning voltages to different regions of the touch display panel. The display region receives display scanning signals while the touch region receives touch scanning signals at the same time, eliminating the need for time-sharing and fully utilizing the frame period for both functions.
Solution Approach 2:
The touch display panel is divided into distinct display region and touch region, with separate scanning voltage applications. The display region uses one set of scanning voltages while the touch region uses another set, allowing independent optimization of each function without mutual interference, even when operating simultaneously.
2Measurement precision
If time-sharing scanning method is used, then touch signals can be detected during touch period, but the charging time of storage capacitor is shortened affecting display effect
Solution Approach 1:
The patent enables continuous display scanning throughout the entire frame period without interruption for touch scanning. By applying different voltages to different regions, the display function operates continuously and fully, maintaining adequate charging time for storage capacitors and ensuring stable display performance.
3Duration of action of moving object
If simultaneous display and touch scanning is implemented, then the display period is maintained, but voltage potential interference from pixel electrodes affects touch pulse signal precision
Solution Approach 1:
The patent applies preliminary compensation by detecting the voltage potential of pixel electrodes before touch scanning and using this information to compensate for interference in the touch pulse signal detection. The compensation process subtracts the detected voltage potential from the raw touch signal to eliminate interference effects.
Solution Approach 2:
The patent implements a feedback mechanism where the voltage potential of pixel electrodes is continuously monitored and used to adjust the touch signal processing. The detected voltage information feeds back into the signal compensation process, dynamically correcting for interference in real-time during simultaneous display and touch operation.
Data Source
AI summary
The present disclosure relates to a driving method and a driving device of touch display panels, and a touch display. The driving method includes: detecting a voltage potential of at least one pixel electrode within the areas of the touch display panel corresponding to different touch scanning partitions, negating the voltage potential, overlapping the negated voltage potential and feed-backed touch pulse signals, and adopting overlapped signals to be the detected touch pulse signals. With the configuration of the touch scanning partitions, the voltage potentials of the pixel electrodes within each of the areas are adopted to respectively adjust the feed-backed touch pulse signals such that the display scanning and the touch scanning can be conducted simultaneously. The detection precision of the touch pulse signals may be enhanced without affecting the display performance.