Conductive Film Non-Equal Pitch Wiring Pattern for Moiré Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing conductive films with mesh-shaped wiring patterns struggle to reduce moiré visibility when overlapped with pixel array patterns, particularly at different viewing angles, and previous solutions either focus on specific frequencies or visibility improvements without addressing both regular and irregular moiré effectively.
Innovation Solution
A conductive member and film with a mesh-shaped wiring pattern featuring two or more insulated wiring layers, where line wirings are composed of straight thin metal wires arranged in parallel and have a non-equal pitch pattern, overlapping in multiple directions to minimize moiré occurrence regardless of the observation angle, utilizing visual response characteristics to optimize moiré evaluation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an equal pitch wiring pattern is used, then the wiring structure is simple and easy to manufacture, but regular moiré becomes conspicuous when overlapped with the pixel array pattern
Solution Approach 1:
The patent applies asymmetry by using non-equal pitch wiring patterns instead of equal pitch patterns. Specifically, the wiring intervals are designed to be non-uniform, with different pitch values in different regions, which breaks the periodicity that causes regular moiré while maintaining manufacturability through standard photolithography processes.
Solution Approach 2:
The patent changes the pitch parameter of the wiring pattern from constant (equal pitch) to variable (non-equal pitch). By optimizing the pitch distribution to match the pixel array characteristics, the patent reduces moiré visibility while keeping the wiring structure simple enough for conventional manufacturing.
2Object-affected harmful factors
If a non-equal pitch wiring pattern is used to reduce moiré, then regular moiré visibility is reduced, but the wiring pattern complexity increases
Solution Approach 1:
The patent segments the wiring pattern into multiple sections with different pitch characteristics. Rather than using a completely irregular pattern, the wiring is divided into zones with specific pitch relationships to the pixel array, reducing complexity while maintaining moiré reduction effectiveness.
Solution Approach 2:
The patent optimizes the pitch parameters systematically rather than randomly. By establishing specific relationships between wiring pitch and pixel pitch, the patent reduces moiré while maintaining a degree of regularity that simplifies the manufacturing process and quality control.
3Object-affected harmful factors
If the wiring pattern is optimized for front observation, then moiré visibility is reduced in front view, but moiré may become visible in oblique observations
Solution Approach 1:
The patent applies local quality by designing different pitch characteristics for different orientations of the wiring pattern. The pitch in the horizontal direction may differ from the pitch in the vertical direction, allowing optimization for multiple viewing angles simultaneously while reducing moiré in both front and oblique observations.
Solution Approach 2:
The patent considers the third dimension of viewing angle by designing the wiring pattern with anisotropic pitch characteristics. Rather than optimizing for a single viewing direction, the pattern is designed to maintain low moiré visibility across a range of angles by incorporating pitch variations that address oblique viewing conditions.
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 proposed solution significantly reduces moiré visibility in both front and oblique observations by optimizing the wiring pattern's pitch and arrangement, ensuring improved image quality and visibility across various angles.
Implementation Method 1
there is a problem of visibility of moiré due to interference between the mesh pattern and the pixel array pattern of the display
Data Source
AI summary
In order to achieve the above object, according to a first aspect of the present invention, there is provided a conductive member including a wiring portion that is composed of a plurality of thin metal wires. The wiring portion has two or more insulated wiring layers and has a mesh-shaped wiring pattern in which line wirings each being composed of a plurality of thin metal wires arranged in parallel in one direction are overlapped in two or more directions, in front observation of the conductive member. The line wiring in at least one direction is a straight line wiring in which the plurality of thin metal wires are straight lines. The straight line wiring in at least one direction is a wiring in which the two or more thin metal wires are consecutively arranged on at least one wiring layer among the two or more wiring layers, and has a non-equal pitch wiring pattern in which repetitive pitches of a predetermined number of the thin metal wires are equal pitches and at least two pitches of the respective pitches of the predetermined number of the thin metal wires are different, in front observation of the conductive member. The conductive member has a wiring pattern that is able to reduce occurrence of moiré in both front observation and oblique observation regardless of the observation angle (viewing angle). A conductive film, a display device, and a touch panel each include the conductive member.