Touch Panel Floating Electrode for Stable Capacitance Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitive touch panels suffer from touch insensitivity and random response errors due to fluctuations in dielectric coefficient caused by temperature changes, affecting the detection accuracy of coupling capacitance between touch electrodes.
Innovation Solution
A touch panel design with increased isolation gaps between first and second touch electrodes, incorporating a floating electrode in the gap to reduce proximal capacitance and increase distal capacitance, thereby minimizing the impact of temperature changes on detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gap between first touch electrode and second touch electrode is small, then the proximal capacitance is large and distal capacitance is small, but the coupling capacitance fluctuates greatly due to temperature change causing touch insensitivity and random response errors
Solution Approach 1:
The patent divides the space between the first touch electrode and second touch electrode into multiple segments by introducing a floating electrode. This segmentation increases the effective gap distance between the main electrodes, reducing the proximal capacitance and its sensitivity to temperature changes, while maintaining stable distal capacitance for reliable touch detection.
Solution Approach 2:
The floating electrode acts as an intermediary element positioned between the first touch electrode and second touch electrode. It serves as a capacitance buffer that reduces the direct coupling between the main electrodes, minimizing the impact of temperature-induced dielectric coefficient changes on the proximal capacitance while preserving the distal capacitance needed for accurate touch sensing.
2Measurement precision
If the isolation gap between first touch electrode and second touch electrode is increased, then the proximal capacitance is reduced and distal capacitance is increased, but the visual uniformity of the display may be affected
Solution Approach 1:
The floating electrode serves as a visual mediator that fills the isolation gap between the first touch electrode and second touch electrode. This intermediary element maintains the optical continuity of the display surface, ensuring visual uniformity while simultaneously providing the electrical function of reducing proximal capacitance and stabilizing the coupling capacitance for accurate touch detection.
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 design reduces fluctuations in proximal capacitance, preventing touch insensitivity and random response errors, ensuring stable touch function and improved display uniformity.
Implementation Method 1
a floating electrode is provided in at least part of the isolation gap, and the floating electrode is insulated from both the first touch electrode and the second touch electrode
Data Source
AI summary
The present application relates to the field of display and provides a touch panel and a display device intended to solve the problem of a touch panel being prone to touch insensitivity and random response errors. The touch panel includes a substrate and touch units. The plurality of touch units are arranged in an array on the substrate, and each of the touch units includes a first touch electrode and at least one second touch electrode insulated from each other. In the same touch unit, an isolation gap is formed between the first touch electrode and the second touch electrode, a floating electrode is provided in at least part of the isolation gap, and the floating electrode is insulated from both the first touch electrode and the second touch electrode. The touch panel and the display device according to the present application are used to implement touch and display functions.