Touch Display Electrode Layout for Low-Visibility Metal Sensing
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Solution Overview
Problem
Display devices with touch detection functions using metal touch detection electrodes face challenges in maintaining low electrical resistance while minimizing visual recognition of patterns, which is exacerbated by the higher light shielding properties of metal materials.
Innovation Solution
The display device incorporates a configuration with metal wirings as touch detection electrodes that form capacitive coupling with drive electrodes, arranged with a predetermined pitch, and are integrated with a color filter having colored areas to minimize visual recognition while maintaining low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal materials are used for touch detection electrodes to achieve low resistance, then electrical resistance is reduced, but light shielding property increases causing decreased transmittance and visual recognition of patterns
Solution Approach 1:
The metal touch detection electrode is divided into multiple segments arranged in a matrix pattern rather than using a continuous metal layer. This segmentation reduces the overall metal coverage area, thereby maintaining low electrical resistance for touch detection while significantly improving light transmittance and reducing visual recognition of the electrode pattern.
Solution Approach 2:
The metal electrode material is strategically positioned only in specific local areas where touch detection is required, rather than using a uniform continuous layer. This localized placement optimizes the balance between electrical conductivity for touch sensing and optical transparency for display quality.
2Reliability
If metal touch detection electrodes are used, then low resistance is achieved, but the pattern becomes visually recognizable
Solution Approach 1:
The continuous metal electrode pattern is segmented into discrete matrix arrangements with sufficient spacing between segments. This segmentation prevents the human eye from recognizing a continuous pattern while maintaining adequate electrical conductivity for touch detection functionality.
Solution Approach 2:
The metal electrode segments are arranged in an asymmetric matrix pattern that does not form recognizable geometric shapes or lines from the user's viewing perspective, thereby reducing visual recognition while maintaining functional performance.
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 detects touches while reducing the visibility of metal electrodes, ensuring low electrical resistance and high transmittance, thus enhancing the display quality and functionality of touch detection devices.
Implementation Method 1
a plurality of touch detection electrodes that are metal wirings facing the drive electrode in the vertical direction and extending in a direction different from the extending direction of the signal lines. The metal wirings are arranged with a predetermined pitch so as to make capacitive coupling with the drive electrode.
Implementation Method 2
capable of detecting an external proximity object based on a change in electrostatic capacitance
Data Source
AI summary
According to an aspect, a display device with a touch detection function includes: a substrate; a drive electrode that extends in a first direction; and a plurality of touch detection electrodes that are metal wirings extending in a second direction different from the first direction. The metal wirings are arranged with a predetermined pitch so as to make capacitive coupling with the drive electrode.