Conductive Thin Wire Touch Electrode for Moire Reduction
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Solution Overview
Problem
Display devices with touch detection functions using metallic materials for touch detection electrodes often suffer from moire patterns due to interference between the metallic material and display device pixels, which affects the visibility and aperture ratio.
Innovation Solution
The use of conductive thin wires with angled and bent portions overlapping color columns in a direction orthogonal to the substrate, forming electrostatic capacitance with drive electrodes, reduces the visibility of touch detection electrodes and minimizes moire patterns by ensuring the electrodes do not shield specific color regions and maintain a regular arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically conductive material such as a metallic material is used for touch detection electrodes to reduce resistance, then the resistance of the touch detection electrodes is reduced, but a moire pattern becomes visible due to interference between the metallic material and display device pixels
Solution Approach 1:
The conductive thin wires are designed with asymmetric bent portions that change the extension direction at specific segments. This asymmetric configuration disrupts the regular periodic pattern that causes moire interference, while maintaining the overall conductive function of the electrode structure
Solution Approach 2:
The conductive thin wires incorporate bent portions with curved geometries instead of straight lines. These curved segments change the extension direction of the wires, creating an irregular pattern that reduces moire pattern visibility while preserving electrical conductivity
2Reliability
If the touch detection electrodes are made more visible or prominent to improve touch detection function, then the touch detection sensitivity is improved, but the aperture ratio of the display device is reduced
Solution Approach 1:
The conductive thin wires are designed with varying local properties - bent portions at specific locations and straight portions at others. This local variation allows the electrodes to maintain sufficient conductivity for touch detection while minimizing overall visibility and preserving aperture ratio
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 effectively reduces the likelihood of moire patterns and maintains a high aperture ratio by ensuring the conductive thin wires do not interfere with light transmission, enhancing the display device's visibility and functionality.
Implementation Method 1
a drive electrode that has electrostatic capacitance with respect to the touch detection electrode
Data Source
AI summary
According to an aspect, a display device with a touch detection function includes: a substrate; a display area in which pixels each constituted by different color regions are arranged in a matrix and that includes color columns in which the color regions of the same colors extend side by side; a touch detection electrode that includes a plurality of conductive thin wires; and a drive electrode. Each of the conductive thin wires includes a plurality of portions at each of which the conductive thin wire extends in a direction at an angle with respect to a direction of extension of the color regions, and a plurality of bent portions at each of which the conductive thin wire is bent with the angle changed. The conductive thin wires include portions each overlapping all of the color columns in a direction orthogonal to the surface of the substrate.