Electroconductive Film Wiring Phase Shift for Moire Suppression
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Solution Overview
Problem
Current techniques fail to effectively reduce moire interference in touch panels and display devices with multiple wiring layers, particularly when the viewing angle changes, leading to compromised visibility and image quality.
Innovation Solution
An electroconductive film with multiple transparent substrates and laminated wiring layers, where the wiring patterns of the upper and lower layers are disposed in a nested arrangement, ensuring that the lowest frequency of moire is set to a first lowest frequency (fm1) and the half-frequency of the wiring patterns' convolution with the pixel array pattern sets a second lowest frequency (fm2), thereby minimizing moire occurrence regardless of the viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer electromagnetic wave shielding pattern is used, then the manufacturing process is simple, but the moire interference occurs when viewing angle changes
Solution Approach 1:
The patent applies the nesting principle by placing wiring patterns in multiple layers at different phases. The second wiring pattern is positioned at a phase-shifted location relative to the first wiring pattern, creating a nested structure where multiple patterns coexist without aligning to produce moire interference. This multi-layer nested arrangement effectively suppresses moire interference while maintaining electromagnetic wave shielding functionality.
Solution Approach 2:
The patent transitions from a single-layer planar structure to a multi-layer three-dimensional structure. By adding a vertical dimension with multiple wiring layers at different phases, the system achieves moire suppression without increasing horizontal complexity. The phase difference between layers creates dimensional separation that prevents pattern alignment and moire formation.
2Illumination intensity
If wiring patterns are arranged to suppress moire at front viewing angle, then visibility is improved from front, but moire interference increases when viewing angle changes
Solution Approach 1:
The patent changes the spatial frequency parameters of the wiring patterns by introducing phase differences between multiple layers. This parameter modification ensures that the combined pattern system maintains low moire visibility across different viewing angles. The phase-shifted arrangement alters the spatial frequency characteristics to prevent constructive interference of moire patterns regardless of observation angle.
Solution Approach 2:
The patent creates a composite wiring structure combining multiple wiring patterns at different phases and positions. This composite arrangement integrates the advantages of individual patterns while canceling their harmful moire interactions. The multi-pattern composite structure achieves both front-view visibility and angle-independent moire suppression through combined spatial frequency characteristics.
3Object-affected harmful factors
If transparent electroconductive patterns are used in double layer, then moire is reduced, but the technique does not consider viewing angle changes
Solution Approach 1:
The patent introduces dynamic adaptability to the wiring pattern arrangement by incorporating phase differences that respond to viewing angle changes. The multi-layer phased structure naturally adapts to different observation angles, maintaining moire suppression performance regardless of whether the viewer is positioned at the front or at an angle. This dynamic adaptation is achieved through the geometric relationship between layered patterns.
Data Source
AI summary
An electroconductive film is provided on a display unit and has at least two wiring layers that are disposed on both sides of a transparent substrate or each disposed on either side of each of the at least two transparent substrates in a laminate form and are regularly arranged. A wiring pattern of the wiring layers is superimposed onto a pixel array pattern of the display unit, the wiring pattern of a lower layer being displaced in phase in relation to an upper layer. The electroconductive film satisfies: fm1≦fm2, when a first lowest frequency (fm1) is the lowest frequency of the moire spatial frequency, and a second lowest frequency (fm2) is the lowest frequency of the moire spatial frequency.