Capacitive Input Electrode Layout for Approach and Press Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch panels require multiple electrodes for detecting touch position and pressure, leading to a complex configuration and reduced detection sensitivity.
Innovation Solution
An input device with a simple configuration using a first electrode, an elastic dielectric, a second electrode, and a third electrode, where the third electrode acts as an active shield to stabilize mutual capacitance and block floating capacitance, allowing detection of approach, contact, and pressing through the first and second electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electrodes (sensor electrode, first electrode, second electrode) are provided separately for detecting touch position and pressure, then detection functionality is comprehensive, but device complexity increases and detection sensitivity decreases
Solution Approach 1:
The patent combines the sensor electrode and pressure detection electrodes into a single integrated electrode structure. The sensor electrode serves dual purposes: detecting touch position through self-capacitance changes and detecting pressure through mutual capacitance changes with the second electrode. This merging eliminates the need for separate sensor and pressure electrodes, reducing configuration complexity while maintaining comprehensive detection functionality.
Solution Approach 2:
The sensor electrode is designed to perform multiple functions: it detects touch position by measuring self-capacitance changes when a finger approaches or contacts the panel, and simultaneously detects pressure by measuring mutual capacitance changes with the second electrode. This multi-functionality allows a single electrode to replace what would traditionally require multiple separate electrodes, simplifying the overall device configuration.
2Adaptability or versatility
If multiple electrodes are provided separately for detecting touch position and pressure, then detection coverage is complete, but detection sensitivity is reduced
Solution Approach 1:
By merging the sensor electrode with the pressure detection function, the patent creates a unified detection system where the same electrode structure serves both touch position and pressure detection. This integration improves detection sensitivity by eliminating the need for separate electrode structures that would otherwise compete for space and electrical resources, allowing for more focused and sensitive detection capabilities.
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 device accurately detects approach, contact, and pressing with improved sensitivity by reducing electric field movement and eliminating capacitance dead zones, enabling precise operation state determination.
Implementation Method 1
a detector that detects approach and contact of a detection target to and with an operation surface located on a front side of the first electrode and pressing of the operation surface by the detection target on a basis of an output of the first electrode
Implementation Method 2
The first electrode and the second electrode at least partially overlap in plan view... measuring, as a change in capacitance between the first electrode and the second electrode, a change in a distance between the first electrode and the second electrode
Data Source
AI summary
An input device with a simple configuration capable of detecting approach and contact of a detection target and pressing by the detection target is provided. The input device includes a first electrode, an elastic dielectric provided on a back side of the first electrode, a second electrode provided with the elastic dielectric sandwiched between the second electrode and the first electrode, a detector that detects approach and contact of a detection target to and with the first electrode and pressing of the first electrode by the detection target on a basis of an output of the first electrode, and a third electrode provided adjacent to the second electrode.