Strip Electrode Pattern Design for Moire Fringe Elimination
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Solution Overview
Problem
Capacitive touch screens experience interference from regular patterns of strip electrodes, leading to Moire fringes that degrade display quality.
Innovation Solution
The touch screen design includes first strip electrodes with patterns to prevent interference, disposed in a layer above second strip electrodes, where these electrodes are configured to load and couple with touch scanning signals during a touch period, reducing Moire fringes by optimizing their orientation and spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular patterns of strip electrodes are used in capacitive touch screens, then touch detection function is achieved, but Moire fringes appear that degrade display quality
Solution Approach 1:
The patent applies asymmetry by making the first strip electrodes and second strip electrodes have different pattern designs. The first strip electrodes have first patterns while the second strip electrodes have second patterns, creating asymmetric structures that disrupt the regular interference patterns causing Moire fringes while maintaining touch detection functionality
Solution Approach 2:
The patent employs curvature by designing the strip electrodes with non-linear, curved patterns instead of straight lines. This curvature disrupts the regular geometric patterns that cause Moire interference while preserving the capacitive coupling necessary for touch detection
2Measurement precision
If transparent strip-shaped electrodes are used for touch detection, then mutual capacitance detection is enabled, but interference patterns cause visibility issues on screen surface
Solution Approach 1:
The asymmetric pattern design of the two electrode layers prevents the formation of regular interference patterns that would otherwise be visible on the display surface, thereby improving visual appearance while maintaining the capacitive coupling needed for precise touch detection
Solution Approach 2:
The curved patterns of the strip electrodes eliminate straight-line interference patterns that cause visible Moire fringes, improving display visibility while the curved electrode structures continue to function for accurate touch position detection through mutual capacitance
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 eliminates Moire fringes, enhancing the display quality of the touch screen by minimizing interference from regular patterns.
Implementation Method 1
a capacitive touch screen is generally formed by incorporating patterns of a touch structure in a touch screen, so that the positions where the fingers touch can be detected by means of, for example, mutual capacitance
Data Source
AI summary
A touch screen and a display device are provided. The touch screen includes first strip electrodes and second strip electrodes, which are disposed in different layers and intersect with each other. The first strip electrodes disposed in a layer above the second strip electrodes have patterns to prevent Moire fringes caused by interference. In the touch period at least some of the first strip electrodes are configured to load touch scanning signals while the second strip electrodes are configured to couple with the voltage signals of the touch scanning signals and output signals; or in the touch period the second strip electrodes are configured to bad touch scanning signals while at least some of the first strip electrodes are configured to couple with the voltage signals of the touch scanning signals and output signals. The touch screen can reduce Moire fringes at the edges of the first strip electrodes caused by interference of light due to regular patterns.