Conductive Film Wire Width Variation for Touch Panel Resistance
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Solution Overview
Problem
Touch sensors face challenges in achieving both improved image quality and reduced resistance, particularly in large screen displays with narrow frames, as thinning the mesh pattern to enhance image quality increases resistance and reduces response speed.
Innovation Solution
A conductive film with a mesh pattern of thin metallic wires on a transparent substrate, where the wire width increases gradually from a reference width to a maximum width in a boundary region, maintaining a specific ratio to reduce resistance while minimizing visual recognition, thus maintaining image quality and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the mesh pattern is thinned to improve image quality, then the visibility of thin wires is reduced, but the resistance value increases and response speed decreases
Solution Approach 1:
The patent applies local quality by differentiating wire widths in different regions: the detecting portion uses thin wires (3-10 μm) for high image quality, while the peripheral wiring portion uses thick wires (10-50 μm) for low resistance. This spatial differentiation allows each region to optimize for its specific function without compromising the other.
Solution Approach 2:
The conductive film is segmented into two distinct functional regions: a detecting portion with a mesh pattern for touch detection and a peripheral wiring portion for signal transmission. This segmentation allows independent optimization of wire dimensions in each region, resolving the contradiction between image quality and response speed.
2Area of stationary object
If the dimensions of lines and spaces are reduced to deal with narrow frames, then the wire volume is reduced, but the resistance value of peripheral wires increases
Solution Approach 1:
The patent applies local quality by differentiating wire widths in different regions: the detecting portion uses thin wires (3-10 μm) for high image quality, while the peripheral wiring portion uses thick wires (10-50 μm) for low resistance. This spatial differentiation allows each region to optimize for its specific function without compromising the other.
3Area of stationary object
If the length of the mesh pattern is increased to deal with large screens, then the coverage area is expanded, but the resistance value of the entire mesh pattern increases
Solution Approach 1:
The conductive film is segmented into two distinct functional regions: a detecting portion with a mesh pattern for touch detection and a peripheral wiring portion for signal transmission. This segmentation allows independent optimization of wire dimensions in each region, resolving the contradiction between image quality and response speed.
Data Source
AI summary
A touch panel has a transparent substrate, a conductive film; a protective layer which is provided on the conductive film to protect the conductive film; and a display device which has a display unit. the conductive film includes: a transparent substrate; a detecting portion provided on at least one surface of the transparent substrate and is provided with a mesh pattern formed of thin metallic wires; and a peripheral wiring portion provided on at least one surface of the transparent substrate and is electrically connected to the detecting portion, a region where the detecting portion is provided is set as a first region and a region other than the first region is set as a second region in the transparent substrate, a wire width change region is present in at least a part of a boundary region including a boundary line between the first region and the second region.