Touch Driving Method for Touch Display Devices
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Solution Overview
Problem
In touch display devices, the coupling effect between touch scanning signals and display data signals leads to display abnormalities such as bright and dark stripes or mura phenomenon, affecting image quality due to the proximity of touch and display layers.
Innovation Solution
A touch driving method that applies a periodic touch scanning signal with signal rising and falling edges synchronized with display scanning periods for sub-pixels of identical colors, reducing the adverse impact on display data and preventing display abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch scanning signal is applied during display data application, then touch control function is achieved, but display abnormalities such as bright and dark stripes or mura phenomenon occur due to coupling effect
Solution Approach 1:
The patent applies periodic action by synchronizing the touch scanning signal with the display scanning signal. Both signals are scanned in the same periodic manner, with the touch scanning signal's active period aligned with the display scanning signal's active period. This periodic synchronization ensures that touch detection and display data application occur during non-overlapping time windows within the same scanning cycle, eliminating the coupling effect while maintaining both touch control and display functions
Solution Approach 2:
The patent employs preliminary action by preparing the touch scanning signal in advance to match the display scanning signal's timing. The touch scanning signal is configured to become active before the display scanning signal, allowing the system to preemptively establish the correct timing relationship. This preliminary timing setup ensures that when both signals are applied, their active periods do not overlap, preventing the coupling effect that causes display abnormalities
2Device complexity
If touch structure and display structure are stacked closely, then device integration is improved, but coupling effect between signals increases causing display abnormalities
Solution Approach 1:
The patent uses periodic action to resolve the signal coupling issue in closely stacked structures. By synchronizing the touch scanning signal with the display scanning signal in a periodic manner, the system creates time-separated active periods for both signals. This temporal separation ensures that even though the touch and display structures are physically close, their electrical signals do not interfere with each other, as they are active at different times within the same scanning cycle
Solution Approach 2:
The patent applies preliminary action by pre-configuring the touch scanning signal's timing to match the display scanning signal's timing. The touch scanning signal is prepared to become active at the same moment the display scanning signal becomes active, which prevents overlap and coupling between the signals. This preliminary timing arrangement allows close stacking of structures while maintaining signal integrity
Data Source
AI summary
A touch driving method for a touch display device, a touch display device, and an electronic device are provided. The touch driving method includes: applying a touch scanning signal, which is periodic, to a touch structure of the touch display device during applying display data to a display structure of the touch display device in a progressively scanning manner. The display structure is stacked with the touch structure, each period of the touch scanning signal includes a signal rising edge and a signal falling edge, and a signal rising edge and a signal falling edge of at least one period of the touch scanning signal are in display scanning periods for scanning display sub-pixels of an identical color in different rows of the display structure.