Touch Detection Device Using Selection Circuit for Electrode Grouping
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Solution Overview
Problem
Existing touch detection devices face challenges in increasing detection accuracy and surface size without increasing the number of input channels in the detection circuit, leading to higher costs and complexity.
Innovation Solution
A touch detection device with a selection circuit that selectively couples a reduced number of detection electrodes to a detection circuit, allowing for first touch detection based on self-capacitance and second touch detection based on mutual capacitance, thereby reducing the number of input channels required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detection electrodes is increased to improve detection accuracy and surface coverage, then the number of input channels in the detection circuit must be increased, leading to increased device complexity and cost
Solution Approach 1:
The detection electrodes are divided into multiple groups, with each group containing a subset of detection electrodes. The selection circuit selectively connects only one group at a time to the detection circuit, allowing the system to manage a large total number of detection electrodes through sequential group processing rather than simultaneous connections.
Solution Approach 2:
The selection circuit dynamically switches between different groups of detection electrodes based on detection needs. This dynamic switching allows the system to adaptively select which detection electrodes are actively connected to the detection circuit at any given moment, optimizing the balance between detection coverage and circuit complexity.
2Area of stationary object
If the number of detection electrodes is increased to expand detection surface size, then the number of input channels must be increased, resulting in higher manufacturing cost
Solution Approach 1:
The detection surface is covered by a large number of detection electrodes arranged in groups. By segmenting these electrodes into multiple groups that can be selectively activated, the system achieves extensive surface coverage without requiring all electrodes to be simultaneously connected to the detection circuit through separate input channels.
Solution Approach 2:
The selection circuit serves multiple functions: it groups detection electrodes, selectively connects groups to the detection circuit, and enables the system to achieve both large detection surface coverage and limited input channel requirements through the same circuit architecture.
3Manufacturing precision
If the number of detection electrodes is increased to improve detection fineness, then the number of input channels must be increased, leading to larger detection circuit size
Solution Approach 1:
Detection electrodes are organized into groups where each group contains electrodes that can provide fine detection resolution. The selection circuit connects only one group at a time to the detection circuit, allowing high detection fineness to be achieved with a limited number of simultaneously active input channels, thereby keeping the detection circuit size manageable.
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
Enables accurate touch detection with a smaller number of input channels, reducing costs and complexity while maintaining high detection accuracy and surface coverage.
Implementation Method 1
The detection circuit is configured to perform first touch detection based on self-capacitance of the selected detection electrodes
Implementation Method 2
The detection circuit is configured to perform second touch detection based on mutual capacitance between the detection electrodes that perform the first touch detection and the drive electrodes
Data Source
AI summary
According to an aspect, a touch detection device includes: a plurality of drive electrodes; a plurality of detection electrodes; a detection circuit electrically coupled to a first predetermined number or less of the detection electrodes; and a selection circuit configured to be electrically coupled to the plurality of detection electrodes and the detection circuit, wherein a second predetermined number as the number of the plurality of detection electrodes is larger than the first predetermined number, the selection circuit selects at least one of groups each including the first predetermined number or less of the detection electrodes, the detection circuit performs first touch detection based on self-capacitance of the selected detection electrodes, and the detection circuit performs second touch detection based on mutual capacitance between the detection electrodes that perform the first touch detection and the drive electrodes.