Touch Sensor Electrode Convex Boundary Design
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Solution Overview
Problem
Existing touch sensors integrated into display devices suffer from degraded image quality due to visually recognizable sensing electrodes, which require improved optical and visual properties while maintaining electrical functionality.
Innovation Solution
A touch sensor design featuring sensing electrodes with connected convex portions and a dummy electrode with a random wavy boundary, along with separation regions and floating electrodes, to minimize electrode visibility and prevent moiré phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sensing electrodes are formed using conventional patterns, then electrical properties for touch sensing are maintained, but optical and visual properties deteriorate due to electrode visibility and moiré phenomena
Solution Approach 1:
The sensing electrode pattern is segmented into multiple convex portions with different radii of curvature. This segmentation breaks the continuous electrode structure into discrete elements, reducing visual recognition and moiré effects while maintaining electrical functionality for touch sensing.
Solution Approach 2:
Different regions of the electrode pattern are assigned different local qualities through varying radii of curvature. Convex portions adjacent to dummy electrodes have smaller radii of curvature, while other regions have larger radii. This local differentiation optimizes both visual properties (reducing visibility) and electrical properties (maintaining sensing capability) in different areas of the electrode.
2Illumination intensity
If dummy electrodes are added to improve visual properties, then electrode recognition is reduced, but device structure becomes more complex
Solution Approach 1:
Dummy electrodes are merged with the sensing electrode pattern in a systematic arrangement where dummy electrodes are positioned between sensing electrodes. This merging approach integrates the visual improvement function into the existing electrode structure without adding completely separate components, thereby reducing overall device complexity while achieving the visual enhancement goal.
3Object-affected harmful factors
If convex portions with varying radii of curvature are used, then moiré phenomena are suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The radius of curvature parameter of convex portions is systematically changed across different regions of the electrode pattern. By defining specific radius ranges for different convex portions (smaller radii adjacent to dummy electrodes, larger radii elsewhere), the invention suppresses moiré phenomena through parameter variation while providing clear manufacturing guidelines that balance precision requirements with practical fabricability.
Data Source
AI summary
A touch sensor according to an embodiment of the present invention includes a substrate layer, sensing electrodes arranged on a top surface of the substrate layer, the sensing electrodes having boundaries in which a plurality of convex portions are connected, and a dummy electrode disposed between the sensing electrodes, the dummy electrode having a boundary in which a plurality of convex portions are connected. The sensing electrodes include a first sensing electrode arranged in a column direction and a second sensing electrode arranged in a row direction. A convex portion in a region where the first sensing electrode, the second sensing electrode and the dummy electrode are adjacent to each other has a radius of curvature less than that of a convex portion in other regions.