Touch Apparatus Third Sensing Electrodes Simultaneous Detection
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Solution Overview
Problem
Current touch apparatuses using capacitive stylus technology face inefficiencies in sensing both fingers and active styluses due to shared sensing electrodes, leading to suboptimal performance and limited reporting rates.
Innovation Solution
The implementation of additional third sensing electrodes outside the first and second sensing electrodes allows for simultaneous signal reading, reducing processing time and improving sensing efficiency by enabling concurrent detection of stylus position and orientation, thereby enhancing the touch apparatus's ability to differentiate between finger and stylus inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If finger and active stylus share two sets of sensing electrodes, then cost is reduced, but sensing efficiency cannot be improved
Solution Approach 1:
The sensing function is segmented into three distinct electrode sets: first sensing electrodes for finger touch detection, second sensing electrodes for stylus detection during writing operations, and third sensing electrodes for stylus detection during non-writing operations. This segmentation allows each electrode set to be optimized for specific sensing tasks, thereby improving overall sensing efficiency while maintaining cost-effectiveness through shared infrastructure.
Solution Approach 2:
The system dynamically switches between different sensing modes by activating appropriate electrode sets based on the detected input type. When a stylus is detected in writing mode, the second sensing electrodes are activated; when in non-writing mode, the third sensing electrodes are activated. This dynamic switching optimizes sensing efficiency for different operational states while reusing the existing electrode infrastructure.
2Productivity
If additional third sensing electrodes are added, then sensing efficiency is improved, but device complexity increases
Solution Approach 1:
The third sensing electrodes are designed to perform multiple functions: detecting stylus position during non-writing operations, determining stylus orientation, and supporting both finger and stylus sensing modes. This multi-functionality justifies the added complexity by providing enhanced capabilities that benefit from a single additional electrode set rather than requiring separate dedicated components.
Solution Approach 2:
The third sensing electrodes are positioned in a different spatial dimension relative to the first and second sensing electrodes, creating a three-dimensional sensing architecture. This dimensional addition enables simultaneous detection of multiple parameters (position, orientation, input type) without requiring proportional increases in processing complexity, as the spatial arrangement itself encodes additional information.
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 shortens processing time and increases reporting rates, improving the touch apparatus's efficiency in sensing both fingers and styluses, with potential enhancements in frame time and report rate from 7.5 ms to 6.2 ms and 133 Hz to 160 Hz or further to 260 Hz.
Implementation Method 1
A capacitive stylus needs an independent electromagnetic induction plate, and is unique because of enabling, through electromagnetic induction, the stylus to actively transmit a signal
Implementation Method 2
A capacitive stylus needs an independent electromagnetic induction plate, and is unique because of enabling, through electromagnetic induction, the stylus to actively transmit a signal
Data Source
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AI summary
A touch apparatus includes a plurality of first sensing electrodes, a plurality of second sensing electrodes, and a plurality of third sensing electrodes. The first sensing electrodes extend along a first direction. The second sensing electrodes are electrically isolated from the first sensing electrodes, and extend along a second direction. The plurality of third sensing electrodes are electrically isolated from the second sensing electrodes, and extend along the first direction. At least some of the first sensing electrodes, at least some of the second sensing electrodes, and at least some of the third sensing electrodes are formed at different film layers respectively.