Touch Display Blank-Phase Timing for Active Stylus Detection
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Solution Overview
Problem
The integration of touch and display functions in in-cell touch displays is limited by the time sequence relationship between the active stylus and the display, affecting the performance of displaying, touching detection, and active stylus detection.
Innovation Solution
The control method involves transmitting an uplink signal in a first long horizontal blanking phase and receiving a downlink signal in subsequent phases, with the location of these phases changing in different frame periods to avoid compressing the time width of the effective operation interval, thus improving display refresh, touching detection, and active stylus detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the uplink signal is transmitted in the frame blanking interval to ensure active stylus detection, then the active stylus detection performance is improved, but the time width of the effective operation interval is compressed, affecting display refresh and touch detection performance
Solution Approach 1:
The patent segments the blanking interval into two distinct parts: frame blanking interval and long horizontal blanking phase. The uplink signal is transmitted specifically in the long horizontal blanking phase rather than the entire frame blanking interval, thereby preserving part of the frame blanking interval for other purposes and avoiding compression of the effective operation interval while still enabling active stylus detection.
Solution Approach 2:
The patent introduces a new time dimension by creating a specialized long horizontal blanking phase within the frame structure. This additional time slot provides a dedicated window for uplink signal transmission without encroaching on the effective operation interval, effectively adding another layer to the time sequence architecture.
2Stability of the object's composition
If the location of long horizontal blanking phase changes in different frame periods to improve display picture quality and reduce shift register aging, then the uniformity of shift register operation is improved, but the complexity of time sequence control increases
Solution Approach 1:
The patent implements periodic variation of the long horizontal blanking phase location across different frame periods. By systematically changing the position of this blanking phase in a periodic manner, the patent ensures that different shift registers are stressed uniformly over time, reducing aging effects while maintaining manageable control through repetitive patterns.
Solution Approach 2:
The patent introduces dynamic adjustment of the long horizontal blanking phase location rather than keeping it fixed. This dynamic repositioning allows the system to adaptively distribute the operational load across different shift registers, improving uniformity and reducing hotspots of aging while the control logic manages the changes through predefined patterns.
Data Source
AI summary
A touch display and a control method thereof, and a touch display device and a control method thereof are provided, and relate to the field of display technologies, to reduce impact of an active stylus on the display, so as to improve performance of displaying, touching detection, and active stylus detection of the display. The control method of the display includes: The touch display transmits an uplink signal in a first long horizontal blanking phase, where the uplink signal is used to detect whether the active stylus performs an operation on the touch display; and the touch display receives a downlink signal from the active stylus in a second long horizontal blanking phase to an mth long horizontal blanking phase, to perform active stylus detection. The control method may be used to control the touch display, to implement active stylus detection.