Touch Display Sensing Method for Reducing Power Consumption
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Solution Overview
Problem
Touch display apparatuses face high power consumption due to incorrect identification of touch sources, such as fingers, palms, and styluses, leading to continuous sensing signals and CPU operation, even when not in normal usage states, causing inefficient electricity usage.
Innovation Solution
A sensing method that differentiates between touch sources by using a combination of first and second sensing elements, where the second sensing signal is stopped earlier than the second touch source is removed, and the CPU is switched to a standby mode, reducing unnecessary power consumption by identifying and categorizing touch sources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch display apparatus continuously transfers sensing signals to the CPU to ensure accurate touch detection, then the reliability of touch identification is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic sensing signal transfer instead of continuous transfer. The sensing signals are transferred at specific time points (first time point, second time point, third time point) rather than continuously, which reduces power consumption while maintaining reliable touch detection capability when actually needed.
Solution Approach 2:
The system dynamically adjusts its operation based on detected touch states. When a touch is detected at the first time point, the system transitions to a state where sensing signals are transferred at subsequent time points. When no touch is detected, the system reduces signal transfer frequency, optimizing the balance between reliability and power consumption based on real-time conditions.
2Speed
If the CPU operates continuously to process all sensing signals, then the responsiveness to touch inputs is improved, but the electricity consumption increases
Solution Approach 1:
The CPU operates periodically rather than continuously, processing sensing signals only at specific time points (first time point, second time point, third time point) when touches are detected or suspected. This periodic operation maintains responsive touch handling while significantly reducing electricity consumption during non-touch periods.
Solution Approach 2:
The system performs preliminary detection at the first time point before full CPU processing is activated. This preliminary action allows the system to prepare for potential touch events and activate full processing only when necessary, optimizing the balance between response speed and energy consumption.
3Device complexity
If the sensing method uses simple capacitance detection to identify touch sources, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent segments the touch detection process into multiple distinct time points (first time point, second time point, third time point) and uses multiple sensing elements. This segmentation allows the system to analyze touch characteristics at different stages, improving identification accuracy while keeping each individual sensing operation relatively simple.
Solution Approach 2:
The system adds the time dimension to touch detection by performing sensing at multiple different time points rather than relying solely on spatial capacitance distribution. This temporal dimension provides additional information for distinguishing between different touch sources (stylus, finger, palm) without requiring more complex sensing hardware.
Data Source
AI summary
A sensing method includes sensing a first touch source at a first time point; transferring a first sensing signal of the first touch source to a CPU at the first time point; sensing a second touch source at a second time point; transferring a second sensing signal of the second touch source to the CPU at the second time point; stopping transferring the second sensing signal at a third time point, and the second touch source is away from the touch display device at a fourth time point; and the second time point is earlier than the third time point, the third time point is earlier than the fourth time point, and the first touch source is different from the second touch source.