Active Stylus Signal Interference Reduction in Display Devices
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Solution Overview
Problem
Conventional touch display devices experience display noise interference with active stylus signals, leading to errors and incorrect image rendering.
Innovation Solution
The display device employs a dual-frequency operation, where the display time of a frame at the lower frequency is divided into three sections. The touch chip transmits uplink signals and receives downlink signals, including touch data, during specific time sections, optimizing data transmission to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel operates at a single frequency with continuous display data transmission, then the display function is maintained, but display noise interferes with active stylus signals causing communication errors
Solution Approach 1:
The frame time is segmented into multiple sections (first time section for uplink signal, second time section for display data, third time section for downlink signal). This temporal segmentation separates display noise generation from stylus signal transmission, eliminating interference while maintaining both display and touch functionality
Solution Approach 2:
The display panel alternates between different transmission modes in a periodic fashion: transmitting display data during second time sections and remaining silent during first and third time sections. This periodic action creates noise-free windows for stylus communication while maintaining continuous display operation
2Measurement precision
If the display panel transmits display data continuously, then the display function is maintained, but the recognition rate of touch data decreases due to noise interference
Solution Approach 1:
The transmission timeline is divided into distinct segments where display data transmission and stylus signal reception occur in separate time sections. This segmentation allows both functions to operate at full efficiency without mutual interference, as each can use the complete bandwidth during its allocated time
Solution Approach 2:
The system dynamically switches between different transmission modes based on the current time section. During second time sections, the display operates at full data rate; during first and third time sections, the display suspends transmission to prioritize stylus communication. This dynamic adaptation optimizes both display performance and touch recognition
Data Source
AI summary
The present application provides a display device, a driving method thereof, and an active stylus thereof. The display device uses a second time section to transmit display data, uses a first time section and a third time section to transmit uplink signals with a lower anti-interference ability, and simultaneously adjusts a data transmission sequence of the active stylus and uses the third time section to transmit first touch data with a lower anti-interference ability to prevent interference of the display noise with the data of the active stylus and improve a recognition rate of touch data of the active stylus.