Touchscreen Call Control for Face Touch Detection and Power Saving
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Solution Overview
Problem
Portable electronic devices with touch-sensitive displays face challenges in efficiently distinguishing between user inputs and unwanted face touches during phone calls, leading to power consumption and accidental feature selection issues due to the limited accuracy of existing touch detection methods.
Innovation Solution
A method is implemented where a threshold value for touch size is dynamically adjusted based on various conditions, including accuracy level, audio levels, motion data, and ambient lighting, to differentiate between user inputs and face touches, allowing the device to conserve power and prevent accidental activations during calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch-sensitive display is turned on during phone calls to detect user input, then accurate input detection is improved, but battery power is drained excessively
Solution Approach 1:
The system dynamically adjusts the display state based on the detected touch type. During phone calls, the display remains off for regular touches but can be activated for face touches detected through audio analysis, allowing the display characteristics to change dynamically based on operational context
Solution Approach 2:
The system changes the operational parameters of the touch-sensitive display by modifying the touch threshold or sensitivity settings during phone calls. This allows the system to differentiate between face touches and intentional user inputs, enabling accurate input detection while conserving battery power by keeping the display off for most touches
2Measurement precision
If the touch threshold is lowered to detect face touches, then face touch detection accuracy is improved, but accidental feature selection increases
Solution Approach 1:
The system uses audio feedback from the phone call to determine whether a touch is a face touch. By analyzing audio levels and patterns during the call, the system can distinguish between accidental face touches and intentional user inputs, even when the display is off, thereby preventing accidental feature selections
Solution Approach 2:
The audio detection system acts as an intermediary between the touch input and the display activation. Instead of directly activating the display on any touch, the system uses audio analysis as an intermediate step to verify whether the touch is intentional, reducing accidental selections while maintaining face touch detection capability
3Use of energy by moving object
If the display is kept off during phone calls to conserve battery, then power consumption is reduced, but user input detection capability is lost
Solution Approach 1:
The system uses the audio from the phone call itself to detect face touches, eliminating the need for the display to be on for input detection. The audio data serves the dual purpose of the phone call function and the touch detection function, allowing the system to self-verify touch intent without additional power-consuming components
Data Source
AI summary
A method of controlling a portable electronic device includes detecting a touch on a touch-sensitive display, adjusting a first threshold based on detected conditions during the touch, comparing a value related to the touch on the touch-sensitive display to the first threshold, and when the value related to touch meets the first threshold, turning off the display.