Touch Panel Overcoating Layer Angle to Reduce Moiré
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The generation of moiré patterns in liquid crystal display devices with touch panels due to interference between fine electrode patterns and pixel patterns degrades image quality, and existing solutions that deform pixel patterns can affect device driving and structural integrity.
Innovation Solution
A touch panel with an overcoating layer having a predetermined intersection angle of 10° to 20° with respect to the electrode layer, which is formed by etching the overcoating layer to create a pattern that offsets the regular period of the electrode pattern, thereby reducing moiré patterns without deforming the pixel patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fine and regular group patterns of electrode layer are used to increase touch input resolution, then touch input resolution is improved, but moiré pattern is generated due to overlap with pixel pattern
Solution Approach 1:
The patent introduces an overcoating layer with a pattern that has a different orientation angle (different by 10° to 20°) compared to the electrode layer pattern. This asymmetric angular relationship disrupts the periodic overlap between electrode patterns and pixel patterns, thereby eliminating the moiré effect while preserving the fine resolution of the electrode layer for accurate touch input detection.
Solution Approach 2:
The overcoating layer serves as an intermediary element between the electrode layer and the pixel pattern. By introducing this intermediate layer with a specific angular offset, the patent mediates the interaction between the electrode pattern and pixel pattern, preventing direct periodic alignment that causes moiré patterns while maintaining touch sensitivity and resolution.
2Object-affected harmful factors
If pixel pattern is deformed to reduce moiré pattern, then moiré pattern is reduced, but device driving and structural integrity are affected
Solution Approach 1:
Instead of deforming the pixel pattern (which would compromise device reliability), the patent inverts the approach by deforming the overcoating layer pattern. The overcoating layer is given a different orientation angle while the pixel pattern and electrode layer maintain their original designs, thus eliminating moiré effects without affecting device driving or structural integrity.
3Object-affected harmful factors
If overcoating layer with different orientation angle is introduced, then moiré pattern is reduced, but device complexity increases
Solution Approach 1:
The patent applies the patterned overcoating layer specifically in the regions where moiré patterns occur (i.e., over the electrode layer areas), rather than modifying the entire device structure. This localized application of the angular offset pattern effectively reduces moiré effects while minimizing the overall complexity increase to only the necessary overcoating regions.
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 effectively reduces moiré patterns in liquid crystal display devices, maintaining image quality and ensuring uninterrupted touch input functionality without compromising the structural integrity of the device.
Implementation Method 1
a wavelike-pattern phenomenon, an optical phenomenon generated when two or more regular and periodic patterns are overlapped with each other, that is, a moiré pattern, may be generated
Data Source
AI summary
A touch panel, a liquid crystal display device including the touch panel, and a method of forming the touch panel may be provided, wherein the touch panel includes an electrode layer having an electrode pattern for touch sensing; and an overcoating layer formed on an upper portion of the electrode layer and having a pattern forming a predetermined intersection angle with respect to the electrode pattern, and the liquid crystal display device includes the touch panel attached to an upper portion of the liquid crystal display device or formed within the liquid crystal display device.