Capacitive Touch Electrode Layout Around a Watch Display
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Solution Overview
Problem
Wearable devices with touch detection functions face challenges in balancing display quality and operability, particularly in efficiently detecting touch inputs while maintaining low power consumption and a simple structure.
Innovation Solution
A display device with a touch detection function using capacitive methods, featuring a display part surrounded by sensor electrodes and a controller that drives and detects these electrodes to identify touch inputs, employing various drive methods such as mutual-capacitive and self-capacitive techniques to optimize touch detection and image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor electrodes are arranged to surround the display part for touch detection, then touch detection accuracy is improved, but device complexity increases
Solution Approach 1:
The sensor electrodes are segmented into multiple independent electrodes arranged around the display part, with each electrode capable of being driven independently. This segmentation allows for precise localization of touch inputs while maintaining a modular structure that manages complexity through functional division.
Solution Approach 2:
The sensor electrodes serve multiple functions: they act as both detection electrodes for sensing touch inputs and as drive electrodes for generating electric fields. This multi-functionality reduces the need for separate electrode sets, thereby managing device complexity while maintaining detection accuracy.
2Adaptability or versatility
If multiple drive methods are implemented for sensor electrodes, then touch detection versatility is improved, but device complexity increases
Solution Approach 1:
The system dynamically switches between different drive methods (mutual-capacitive and self-capacitive) based on operational requirements. The controller can adaptively select which electrodes to drive and which to detect, providing versatility in touch detection while managing complexity through dynamic reconfiguration rather than permanent multi-mode hardware.
Solution Approach 2:
The controller implements periodic switching between different drive methods, alternating between mutual-capacitive drive and self-capacitive drive in different time periods. This periodic action allows the system to maintain multiple capabilities without requiring all components to operate simultaneously, thereby reducing instantaneous complexity.
3Device complexity
If sensor electrodes are used for both detection and drive functions, then device simplicity is improved, but measurement precision may worsen
Solution Approach 1:
Even though the same physical electrodes are used for both detection and drive functions, the controller segments their operational roles by selectively activating specific electrodes for driving while monitoring others for detection. This temporal and functional segmentation maintains detection precision despite the simplified physical configuration.
Solution Approach 2:
The system uses only a subset of the sensor electrodes for driving at any given time, while the remaining electrodes are dedicated to detection. This partial action approach ensures that detection electrodes are not overwhelmed by drive signals, maintaining measurement precision while utilizing a unified electrode structure.
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
The solution enables wearable devices to achieve both high display quality and excellent touch operability with low power consumption, using capacitive methods to effectively detect touch inputs and improve user interaction.
Implementation Method 1
A display device with a touch detection function using capacitive methods, featuring a display part surrounded by sensor electrodes and a controller that drives and detects these electrodes to identify touch inputs
Data Source
AI summary
According to one embodiment, a display device includes a display part, a plurality of sensor electrodes and a controller. The display part is configured to display an image. The plurality of sensor electrodes are arranged to surround the display part. The controller is electrically connected to the sensor electrodes, and is configured to detect an object close to or contacting the sensor electrodes. The controller drives at least one of the sensor electrodes as a detection electrode and drives at least one of the sensor electrodes as a drive electrode.