Wearable Display Touch Detection Using Non-Adjacent Electrode Merging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wearable devices with limited analog front-end circuits connected to touch sensors require time-divisional driving, leading to slower touch detection due to the insufficient number of circuits compared to sensors.
Innovation Solution
The display device employs a configuration where multiple detection electrodes are connected to different analog front-end circuits, allowing for simultaneous detection without the need for time-divisional driving, using an electrostatic capacitance method to identify touch positions based on detection signal amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple touch sensors are arranged around the display area, then touch detection coverage is improved, but the number of analog front-end circuits becomes insufficient relative to the number of sensors
Solution Approach 1:
The patent combines multiple detection electrodes (non-adjacent electrodes) into a single analog front-end circuit channel. By electrically connecting multiple electrodes that are not adjacent to each other to the same AFE circuit, the system can multiplex these electrodes temporally or spatially, reducing the total number of AFE circuits needed while maintaining comprehensive touch detection coverage around the display area.
2Device complexity
If time-divisional driving is used to drive touch sensors, then the number of analog front-end circuits can be reduced, but touch detection time increases
Solution Approach 1:
The patent pre-configures the electrical connections between multiple non-adjacent detection electrodes and the same AFE circuit before operation. This preliminary arrangement allows the system to switch between electrodes more efficiently during operation, reducing the time penalty associated with time-divisional multiplexing while still achieving circuit reduction.
3Device complexity
If fewer analog front-end circuits are used, then system cost and complexity are reduced, but touch detection speed decreases due to time-divisional driving
Solution Approach 1:
The patent segments the touch detection function across multiple non-adjacent electrodes that are strategically positioned around the display area. By dividing the detection function across these segmented electrodes and mapping them to fewer AFE circuits, the system achieves both cost reduction and maintains detection speed through optimized spatial distribution and electrical connectivity.
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 configuration enables faster touch detection and reduces the complexity and cost of the system, providing reliable operation even with fewer analog front-end circuits compared to touch sensors.
Implementation Method 1
using an electrostatic capacitance method to identify touch positions based on detection signal amplitudes
Data Source
AI summary
According to one embodiment, a display device includes a display area, a peripheral area and a plurality of detection electrodes. The display area includes a display element. The peripheral area surrounds the display area. The plurality of detection electrodes are arranged in the peripheral area. The plurality of detection electrodes are each electrically connected to at least one other detection electrode that is not adjacent thereto.