Conductive Film Mesh Pattern Moire Suppression
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Solution Overview
Problem
Conductive films used in display devices, particularly touch panels, suffer from unsatisfactory moire recognition properties due to frequency and intensity factors, leading to impaired image quality and visibility issues, especially when pressed by a human finger, and existing techniques fail to universally improve moire recognition across different display resolutions and observation distances.
Innovation Solution
A conductive film with a mesh-like wiring pattern is designed, where the evaluation index of moire is calculated using two-dimensional Fourier spectra and visual response characteristics, ensuring that frequencies and intensities of moires are within predetermined values, thereby inhibiting moire occurrence and enhancing visibility regardless of display resolution and observation distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mesh-like wiring pattern is used in conductive film, then electrical conductivity is improved, but moire visibility increases and image quality deteriorates
Solution Approach 1:
The patent applies local quality by varying the mesh pattern parameters (pitch, wire width, rotation angle) in different regions or at different locations of the conductive film to optimize the balance between electrical conductivity and moire suppression for specific viewing conditions and display resolutions
Solution Approach 2:
The patent changes physical parameters of the mesh pattern including pitch, wire width, rotation angle, and mesh shape to control the spatial frequency characteristics, thereby adjusting the moire visibility while maintaining electrical conductivity within acceptable ranges
2Manufacturing precision
If mesh pattern pitch is reduced to improve resolution compatibility, then moire frequency increases, but visual recognition of moire becomes more difficult only at specific observation distances
Solution Approach 1:
The patent introduces dynamic adaptability by designing the mesh pattern parameters to respond to different observation distances and display resolutions, making the moire suppression effective across a range of viewing conditions rather than a fixed configuration
Solution Approach 2:
The patent achieves universality by creating a mesh pattern design that simultaneously addresses multiple display resolutions and observation distances, making the conductive film applicable to various display devices without requiring device-specific customization
3Reliability
If mesh pattern intensity is increased to improve conductivity, then moire intensity increases, but moire becomes more visually recognized even at frequencies below visual response threshold
Solution Approach 1:
The patent changes the intensity parameters of the mesh pattern including wire width, material density, and pattern fill factor to optimize the balance between electrical conductivity and moire intensity, ensuring that conductivity requirements are met while keeping moire visibility below perceptual thresholds
Data Source
AI summary
The conductive film includes a transparent substrate and a conductive portion having a wiring pattern, in which when the wiring pattern is observed from at least one visual point, with respect to frequencies and intensities of moires which are calculated respectively from peak frequencies and peak intensities of predetermined data and peak frequencies and peak intensities of another predetermined data, an evaluation index of moire, which is calculated from evaluation values of moires obtained by applying visual response characteristics of a human being to the intensities of the moires according to an observation distance at the frequencies of the respective moires that are equal to or lower than the maximum frequency of moire specified according to display resolution of the display unit, is equal to or less than a predetermined value.