Selective Scanning for Touch-Sensitive Display Devices
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Solution Overview
Problem
Touch-sensitive display devices face high resource consumption when detecting inputs, especially with active styluses, due to the need to scan and track multiple electrodes simultaneously, leading to inefficiencies in power and processing usage.
Innovation Solution
The approach involves selectively scanning regions of interest on the touch-sensitive display based on predicted positions of stylus electrodes, reducing the number of electrodes that need to be actively scanned, thereby conserving electrical power and processing resources without compromising input detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all display electrodes are scanned to ensure detection of all touch inputs, then detection completeness is improved, but power consumption and processing resources increase
Solution Approach 1:
The display electrodes are divided into multiple groups, with different scanning frequencies assigned to different groups. Frequently touched regions are scanned more often while less active regions are scanned less frequently, reducing overall power consumption while maintaining detection completeness for active areas.
Solution Approach 2:
The scanning frequency of display electrodes is made dynamic rather than static. The system adjusts scanning frequencies based on detected touch patterns and regions of interest, allowing the scanning rate to adapt to user interaction needs and thereby reducing power consumption during periods of low activity.
2Measurement precision
If multiple stylus electrodes are tracked simultaneously to enable precise input detection, then measurement precision is improved, but processing resources and complexity increase
Solution Approach 1:
The tracking of multiple stylus electrodes is segmented into sequential processing stages. Instead of simultaneously calculating positions and orientations of all electrodes, the system processes them in groups or sequences, reducing the computational burden while maintaining the ability to determine precise stylus state.
Solution Approach 2:
The system performs preliminary actions by predicting future positions of stylus electrodes based on previous movements. This allows the system to prepare scanning and processing resources in advance for expected electrode positions, reducing the complexity of real-time tracking while maintaining precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively reduces power and processing burdens while maintaining accurate touch input detection, allowing for efficient interaction with multiple input objects, including active styli, by predicting and targeting specific regions of interest for scanning.
Implementation Method 1
The touch sensor typically includes a plurality of touch-sensing electrodes distributed across the touch sensor to enable capacitance measurements at specific two-dimensional locations
Implementation Method 2
receiving a stylus excitation signal applied to a stylus electrode, and/or exchanging data with an active stylus via driving of display electrodes
Data Source
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AI summary
Detecting touch input includes, over a series of touch-sensing time frames, interpreting electrical conditions of display electrodes of a touch-sensitive display device to estimate frame-by-frame positions of two or more stylus electrodes of an active stylus. Based on the estimated frame-by-frame positions, future positions of each of the two or more stylus electrodes during a future touch-sensing time frame are predicted. Regions of interest on the touch-sensitive display device are identified, each region of interest including a plurality of display electrodes surrounding the predicted future position of a stylus electrode of the two or more stylus electrodes. During the future touch-sensing time frame, display electrodes in the regions of interest are selectively scanned.