OMO Touch Sensor Electrode with Through-Holes for Moire Reduction
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Solution Overview
Problem
Touch sensors face challenges in simultaneously achieving low resistance and high transmittance while minimizing the moire phenomenon and enabling large-area implementation.
Innovation Solution
A touch sensor design featuring a conductive metal layer sandwiched between transparent oxide layers, with through-holes of specific shapes and spacings to form an OMO laminate electrode layer, which increases aperture ratio and reduces moire visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent oxide is used as the electrode layer material, then high transmittance is achieved, but resistance increases
Solution Approach 1:
The patent employs an OMO (Oxide/Metal/Oxide) composite structure where a transparent oxide layer (high transmittance) is combined with a conductive metal layer (low resistance). This composite electrode layer integrates the advantages of both materials: the transparent oxide provides optical transparency while the conductive metal provides electrical conductivity, resolving the contradiction between high transmittance and low resistance
Solution Approach 2:
The conductive metal layer is strategically positioned within the electrode structure, specifically between two transparent oxide layers. This local placement of conductive material optimizes the balance between transmittance and resistance by concentrating the conductive function in a specific region while maintaining overall transparency of the electrode assembly
2Reliability
If a conductive metal is used as the electrode layer material, then low resistance is achieved, but transmittance decreases
Solution Approach 1:
The OMO composite structure sandwiches the conductive metal layer between two transparent oxide layers. This configuration allows the metal to provide low resistance while the surrounding transparent oxide layers restore optical transmittance, effectively resolving the contradiction between low resistance and high transmittance
Solution Approach 2:
The transparent oxide layers act as intermediary materials that mediate between the conductive metal layer and the external environment. They allow light to pass through while containing the conductive metal layer, thus enabling the metal to provide electrical conductivity without directly blocking light transmission
3Illumination intensity
If a mesh-shaped conductive metal is used to increase transmittance, then low resistance and good transmittance are secured, but the moire phenomenon becomes more visible
Solution Approach 1:
The patent removes the mesh pattern from the conductive metal layer and replaces it with a continuous or uniformly patterned structure. By extracting the mesh configuration that causes moire interference, the design maintains electrical conductivity while eliminating the visual interference pattern, thus resolving the contradiction between transmittance enhancement and moire phenomenon suppression
4Object-affected harmful factors
If a transparent oxide is used as the electrode layer, then the moire phenomenon is minimized, but resistance increases
Solution Approach 1:
The OMO composite structure combines transparent oxide layers (which minimize moire phenomenon) with a conductive metal layer (which provides low resistance). This composite approach allows the system to simultaneously achieve moire minimization through the transparent oxide and low resistance through the embedded metal layer, resolving the contradiction between these two requirements
Data Source
AI summary
A touch sensor has a base layer and an electrode layer. The electrode layer includes a first transparent oxide layer formed on the base layer, a conductive metal layer formed on the first transparent oxide layer, and a second transparent oxide layer formed on the conductive metal layer and has a plurality of through-holes with the same shape and spacing.