Asynchronous Touch Scan Timing Circuit for Display Panels
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Solution Overview
Problem
Existing display driving circuits face limitations in flexibility and efficiency due to the fixed synchronization of touch frame and display frame periods, leading to reduced touch scan rates and user experience, especially when processing touch detection data takes longer than a display frame period.
Innovation Solution
An electronic circuit and method that allows the touch frame to be asynchronous with the display frame period by generating a scan start signal based on a flag signal from the processing circuit, enabling dynamic adjustment of touch frame frequency and start time, independent of the touch frame synchronization signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch frame is synchronized with the display frame period, then the system maintains simple timing coordination, but the touch scan circuit becomes idle when data processing exceeds one display frame period, reducing touch report rate
Solution Approach 1:
The patent implements dynamic timing by allowing the touch frame period to be independent and adjustable relative to the display frame period. The touch frame period can be extended across multiple display frame periods when processing time requires, eliminating idle time in the touch scan circuit while maintaining flexible synchronization with the display system.
2Stability of the object's composition
If the touch frame period is fixed to match the display frame period, then the system achieves consistent timing, but the algorithm cannot complete processing in time under special operation conditions, causing the touch scan circuit to idle
Solution Approach 1:
The system dynamically adjusts the touch frame period duration based on processing requirements. When the algorithm cannot complete processing within one display frame period, the touch frame period automatically extends to accommodate the processing time, eliminating idle time in the touch scan circuit.
Solution Approach 2:
The timing circuit generates a scan start signal that triggers the touch scan circuit to begin scanning in advance or at optimal timing relative to the display frame period, ensuring that scanning operations are continuously performed without idle periods even when processing extends beyond a single display frame period.
3Ease of operation
If the touch frame starts at the fixed start time of the display frame period, then the system maintains simple synchronization, but the flexibility of the system is reduced
Solution Approach 1:
The patent implements dynamic timing by allowing the touch frame period to be independent and adjustable relative to the display frame period. The touch frame period can be extended across multiple display frame periods when processing time requires, eliminating idle time in the touch scan circuit while maintaining flexible synchronization with the display system.
Data Source
AI summary
An electronic circuit, adapted to drive a display panel comprising touch sensors, is provided. The electronic circuit can include a display driving circuit, a timing circuit and a touch scan circuit. The display driving circuit drives a touch display panel. The timing circuit receives a flag signal from a processing circuit and generates a scan start signal according to the flag signal. The touch scan circuit generates a plurality of touch scan signals according to the scan start signal and a touch column synchronization signal. The touch scan circuit determines a start time of a touch frame period according to a pulse of the scan start signal. The scan start signal can be asynchronous or delayed with respect to a touch frame synchronization signal generated by the display driving circuit.