Touch Display Electrode Asymmetry to Reduce Moiré Patterns
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Solution Overview
Problem
Conventional touch displays experience a moiré pattern due to the arrangement of transparent electrodes and pixels, which degrades image quality.
Innovation Solution
A touch display design featuring a substrate with a display medium layer, a touch layer with slits and electrodes, where the electrode is positioned between the slits and has specific linear sections and inflection points, and the moiré ratio is optimized to reduce the moiré effect by adjusting the pitch and arrangement of conducting-wire portions and pixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transparent electrodes are overlaid on the pixels, then the touch display can detect touch signals, but a moiré pattern is generated due to the arrangement of transparent electrodes and pixels
Solution Approach 1:
The electrode is divided into multiple linear sections (first linear sections and second linear sections) that are alternately arranged in the second direction. This segmentation allows the electrode structure to be optimized independently from the pixel arrangement, reducing the moiré effect while maintaining touch detection functionality.
Solution Approach 2:
The electrode structure employs asymmetric design with specific inflection points positioned at defined locations on the linear sections. The ratio of distances from inflection points to intersection points is controlled within a specific range (0.33 to 3.05), creating an asymmetric pattern that disrupts the regular interference between electrode and pixel grids, thereby reducing moiré patterns.
Solution Approach 3:
The patent optimizes geometric parameters of the electrode structure, including the positions of inflection points, the arrangement of linear sections, and the ratio of distances (controlled within 0.33 to 3.05). By adjusting these parameters, the electrode pattern is optimized to minimize moiré effects while preserving touch sensitivity.
2Object-affected harmful factors
If the electrode is designed with specific linear sections and inflection points, then the moiré effect is reduced, but the electrode structure becomes more complex
Solution Approach 1:
The electrode is segmented into alternating first and second linear sections with inflection points at specific locations. This segmentation provides a systematic approach to reducing moiré effects through regular geometric patterns, making the complex structure manageable and manufacturable.
Solution Approach 2:
The complex electrode structure is optimized by controlling key parameters within specific ranges (e.g., the ratio of distances from inflection points to intersection points should be 0.33 to 3.05). This parameter-based optimization provides clear design guidelines that simplify the implementation of the reduced-moiré electrode structure.
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 effectively decreases the moiré effect and moiré pattern on touch displays, enhancing image quality by aligning the relative positions of pixel areas and conducting-wire portions according to specific ratios and arrangements.
Implementation Method 1
a moiré pattern may be generated in some images on the screens of the touch display by a moiré effect due to the arrangement of the conventional transparent electrodes and pixels
Data Source
AI summary
A touch display includes a display panel and a touch layer. The display panel has pixel areas, and one of the pixel areas has a pixel pitch in a first direction. The display panel includes a substrate, and a display medium layer disposed over the substrate. The touch layer is disposed over the substrate, and includes slits and an electrode. The slits include a first slit and a second slit adjacent to the first slit. The electrode is disposed between the first slit and the second slit. The electrode includes first linear sections and second linear sections alternately arranged in a second direction.