3D Mesh Electrode Touch Screen for Moiré Reduction
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Solution Overview
Problem
Existing touch screens with projected capacitive technology face issues with visibility due to non-uniform external-light reflectance and misalignment of dummy wiring, leading to a moiré effect and reduced display quality.
Innovation Solution
A touch screen design featuring mesh-like electrodes with crossing portions and disconnected portions for insulation, where the disconnected portions are strategically placed outside the crossing areas, reducing the need for dummy wiring and minimizing visibility and electrical issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dummy wiring is disposed in different layer from disconnected portions to suppress visibility, then visibility of disconnected portions is suppressed, but misalignment of dummy wiring occurs causing non-uniform planar shape and visibility problems
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial arrangement by disposing detection wiring and dummy wiring in different layers (vertical dimension). The disconnected portions are in a first layer while dummy wiring is in a second layer, achieving visibility suppression through vertical separation rather than horizontal placement, thereby eliminating misalignment issues.
Solution Approach 2:
The patent segments the wiring structure into distinct functional components: detection wiring with disconnected portions in one layer, and separate dummy wiring in another layer. This segmentation allows each component to perform its specific function independently - detection wiring for touch sensing and dummy wiring for visual uniformity - without interfering with each other's performance.
2Reliability
If row-direction wiring and column-direction wiring are disposed to cover display area, then touch detection function is achieved, but display-light transmittance and external-light reflectance become non-uniform causing moiré effect and wiring visibility
Solution Approach 1:
The patent uses vertical layering to separate detection wiring from the display surface. By placing detection wiring in lower layers and adding dummy wiring in upper layers, the system maintains touch detection functionality while suppressing the visual impact of wiring on the display area, thereby reducing moiré effects and wiring visibility.
Solution Approach 2:
Dummy wiring acts as an intermediary element that compensates for the visual impact of disconnected portions. By adding dummy wiring in strategic locations in upper layers, the patent creates a more uniform visual appearance that masks the underlying detection wiring structure, thereby reducing moiré effects while preserving touch sensitivity.
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
This design enhances display quality by reducing visibility of disconnected portions and preventing electrical problems, while maintaining sensitivity and accuracy in touch detection.
Implementation Method 1
A projected capacitive touch panel includes, as detection wiring for detecting capacitance, a first series of conductor elements formed on a thin dielectric film and a second series of conductor elements formed above the first series of conductor elements via an insulating film
Implementation Method 2
There is a method of detecting a change in electric field, i.e., a change in mutual capacitance, between a plurality of row-direction wires extending in a row direction and constituting a first electrode and a plurality of column-direction wires extending in a column direction and constituting a second electrode
Data Source
AI summary
A lower electrode and an upper electrode have crossing portions where first element wiring of a mesh of the lower electrode and second element wiring of a mesh of the upper electrode cross each other in three dimensions. The lower electrode includes row-direction wiring and a floating electrode that are insulated from each other by disconnected portions provided to the first element wiring other than the crossing portions. The upper electrode includes column-direction wiring and a floating electrode that are insulated from each other by disconnected portions provided to the second element wiring other than the crossing portions.