Adaptive Proximity Sensing Delay for Input-Display Latency
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Solution Overview
Problem
Input-display devices experience latency between detecting an input object and updating the display, due to processing time and waiting for the next display update.
Innovation Solution
An input device with a proximity sensing panel and circuit that acquires sensing measurements, processes them to obtain positional information, and adjusts a sensing delay based on Vsync signal wait information to synchronize with display updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the sensing delay is fixed, then the sensing operation is simple, but the latency between input detection and display update cannot be optimized
Solution Approach 1:
The sensing delay is changed from a fixed value to a dynamically adjustable parameter. The proximity sensing circuit now adjusts the sensing delay based on Vsync signal wait information received from the processing system, allowing the delay to adapt to different display update timing requirements and minimize latency.
Solution Approach 2:
A feedback mechanism is established where the processing system provides Vsync signal wait information back to the proximity sensing circuit. This feedback enables the sensing circuit to adjust its sensing delay based on the actual display update timing, creating a closed-loop system that optimizes latency performance.
2Loss of time
If the sensing delay is adjusted dynamically, then the latency is reduced, but the control complexity increases
Solution Approach 1:
The proximity sensing circuit autonomously adjusts its own sensing delay based on the Vsync signal wait information it receives. The circuit independently determines the appropriate delay adjustment without requiring external intervention, simplifying the overall system operation while achieving latency optimization.
3Measurement precision
If multiple sensing frames are processed, then the positional information accuracy is improved, but the processing time increases
Solution Approach 1:
Multiple sensing measurements are acquired and processed in advance to determine accurate positional information before the display update occurs. By performing the sensing and processing operations ahead of time, the system ensures accurate positional data is ready for display without adding latency to the final update.
Data Source
AI summary
An input device includes a proximity sensing panel including sensor electrodes and a proximity sensing circuit. The proximity sensing circuit is configured to acquire, for a sensing frame, sensing measurements of a sensing region using the sensor electrodes, process, for the sensing frame, the sensing measurements to obtain positional information, transmit the positional information to a processing system, and receive, from the processing system, vertical synchronization (Vsync) signal wait information responsive to the positional information. The proximity sensing circuit is further configured to adjust a sensing delay according to Vsync signal wait information.