Touch Panel Detection Frequency Control for Display Noise
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Solution Overview
Problem
In electronic apparatuses with touch panels, noise from display devices during scanning periods reduces the signal-to-noise ratio, leading to deteriorated detection accuracy, and existing methods to reduce power consumption are insufficient in maintaining consistent detection accuracy across varying input operations and environmental changes.
Innovation Solution
The electronic apparatus alternates between scanning and non-scanning periods for the display device, with the detecting device performing more or fewer detections during non-scanning periods based on state changes that affect detection accuracy, controlled by a state change detecting section to optimize detection frequency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detecting device carries out detection more times during non-scanning periods to improve detection accuracy, then detection accuracy is improved, but electric power consumption increases
Solution Approach 1:
The patent applies dynamics by making the detection frequency adjustable based on operational conditions. The control section dynamically changes the number of detections performed during non-scanning periods according to the type of input operation and activated application software, optimizing the balance between detection accuracy and power consumption for each specific situation.
Solution Approach 2:
The patent changes the parameter of detection frequency based on different operational states. By detecting state changes that affect required detection accuracy and adjusting the number of detections accordingly, the system adapts its power consumption and performance characteristics to match actual needs.
2Measurement precision
If the detecting device carries out detection during scanning periods, then detection coverage is improved, but signal-to-noise ratio deteriorates due to noise from display device
Solution Approach 1:
The patent segments the operation cycle into scanning periods and non-scanning periods, assigning different functions to each. Detection operations are specifically scheduled during non-scanning periods when display noise is reduced, while scanning periods focus on display refresh operations, thereby separating conflicting functional requirements.
Solution Approach 2:
The patent utilizes the periodic nature of display scanning operations to schedule detection activities. By performing detections during the periodic non-scanning intervals when the display device is not actively scanning, the system exploits the temporal pattern of noise generation to achieve better signal-to-noise ratio.
3Use of energy by moving object
If fixed detection frequency is used during non-scanning periods, then power consumption is reduced, but detection accuracy becomes insufficient under varying conditions
Solution Approach 1:
The patent implements feedback by detecting state changes that affect the required detection accuracy and using this information to adjust the detection frequency. The control section receives feedback about the current operational state and modifies detection parameters accordingly, ensuring adequate accuracy while avoiding unnecessary power consumption.
Solution Approach 2:
The system transitions from a static detection frequency approach to a dynamic one where the detection frequency adapts to changing operational conditions. This allows the system to optimize power consumption while maintaining sufficient detection accuracy for each specific situation.
Data Source
AI summary
Electronic apparatus (100) includes a display device (1), a detecting device (20) which detects an input, a state change detecting section (31), and a control section. The control section controls the detecting device (20) so that the detecting device (20) carries out the detection more times during a non-scanning period in a case where a state change causing an improvement in detection accuracy is detected and so that the detecting device (20) carries out the detection fewer times during the non-scanning period in a case where the state change causing a deterioration in detection accuracy is detected. With the configuration, it is possible to improve detection accuracy of the detecting device while reducing electric power consumption.