Touch Electrode Segmentation for On-Cell Display Moiré Fringe Reduction
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Solution Overview
Problem
On-Cell Touch Panels exhibit luminance differences across the product, resulting in bright and dark stripes due to lower light transmittance at inclined touch electrode regions, leading to coherence with pixel electrode gratings and Moiré fringes.
Innovation Solution
A touch assembly with touch electrodes having first and second touch electrode portions arranged in alternating periods, where the second period is smaller than the first, and both have trapezoidal cross-sections with staggered inclined sides, ensuring a uniform distribution and thickness optimized for light interference, thereby increasing light transmittance and reducing Moiré fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If touch electrodes are arranged with inclined sides to reduce Moiré fringes, then Moiré fringes are reduced, but light transmittance decreases causing bright and dark stripes
Solution Approach 1:
Each touch electrode is segmented into multiple electrode portions (first, second, third portions) arranged in different periods. This segmentation allows different portions to serve different functions: some portions reduce Moiré fringes while others maintain light transmittance, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
Different portions of the touch electrodes are designed with different local characteristics. The first electrode portions have larger periods to reduce Moiré fringes, while the second electrode portions have smaller periods to maintain light transmittance. This local differentiation allows each portion to optimize for its specific function.
2Object-generated harmful factors
If touch electrode period is reduced to increase frequency and reduce Moiré fringes, then Moiré fringes are reduced, but manufacturing complexity increases
Solution Approach 1:
The touch electrode structure is segmented into multiple portions with different period characteristics. This segmentation enables the system to achieve Moiré fringe reduction through multi-period arrangement without requiring uniform reduction of all electrode periods, which would otherwise increase manufacturing complexity across the entire structure.
Solution Approach 2:
Instead of uniformly reducing electrode periods in one dimension, the invention introduces a multi-dimensional period structure with first, second, and third periods of different magnitudes. This dimensional differentiation allows Moiré fringe reduction while maintaining manageable manufacturing complexity through hierarchical period organization.
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 solution mitigates the Moiré fringes and visual discomfort from bright and dark stripes by increasing the frequency of touch electrode portions, enhancing luminance and light transmittance, particularly for green-yellow light, while maintaining electrical performance.
Implementation Method 1
a thickness of each of the first touch electrode portions and the second touch electrode portions is a multiple of a half wavelength of light passing through each of the first touch electrode portions or the second touch electrode portions
Data Source
AI summary
A touch assembly, a display panel containing the touch assembly, and method for manufacturing the touch assembly are provided in embodiments of the disclosure. The touch assembly includes: a substrate; and a plurality of touch electrodes. Each of the plurality of touch electrodes includes a first touch electrode portion and a plurality of second touch electrode portions provided on the first touch electrode portion, and the first touch electrode portions of all of the plurality of touch electrodes are provided alternately in a first period on the substrate and distributed to space apart from one another, and the second touch electrode portions are provided alternately in a second period on each of the first touch electrode portions and distributed to space apart from one another, the second period being smaller than the first period.