Conductive Grid Film Layout for Clearer Touch Assemblies
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Solution Overview
Problem
Existing conductive films for touch assemblies face challenges in achieving superior optical performance and require complex preparation processes due to the intricacies involved in processing touch patterns and lead wires.
Innovation Solution
A conductive film with a base film and a conductive layer featuring conductive regions, including a conductive grid structure with hollow grids and conductive grid lines, where the first conductive region has a higher sheet resistance than the second, allowing for improved optical performance and simplified assembly by separating touch patterns and lead wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing conductive films are used for subsequent processing of touch patterns and lead wires, then the touch assembly can be fabricated, but the preparation process becomes relatively complicated
Solution Approach 1:
The conductive layer is divided into multiple conductive regions with different sheet resistances. The first conductive region has higher sheet resistance suitable for touch patterns, while the second conductive region has lower sheet resistance suitable for lead wires. This segmentation allows each region to be optimized for its specific function, simplifying the overall preparation process by eliminating the need for separate processing steps.
Solution Approach 2:
Different regions of the conductive layer are assigned different electrical properties (sheet resistance values) to match their specific functional requirements. The first conductive region is designed with higher sheet resistance for touch sensing areas, while the second conductive region is designed with lower sheet resistance for signal transmission areas. This local differentiation optimizes performance while simplifying manufacturing.
2Manufacturing precision
If a conductive film with uniform sheet resistance is used, then the manufacturing process is simpler, but the optical performance (light transmittance and haze) cannot be optimized for different functional areas
Solution Approach 1:
The conductive layer is designed with spatially varying sheet resistance properties. The first conductive region has higher sheet resistance optimized for touch pattern areas where optical performance is critical, while the second conductive region has lower sheet resistance optimized for lead wire areas where electrical conductivity is prioritized. This local quality differentiation allows each area to be optimized for its specific function.
Solution Approach 2:
The conductive film is segmented into multiple regions with distinct electrical characteristics. This segmentation enables independent optimization of optical and electrical properties in different areas of the touch assembly, allowing the film to adapt to varying functional requirements across its surface.
3Reliability
If the conductive layer has high conductivity (low sheet resistance), then electrical performance is improved, but light transmittance decreases
Solution Approach 1:
The conductive layer implements spatially differentiated sheet resistance values to balance electrical and optical requirements. In the first conductive region, higher sheet resistance is used to maintain high light transmittance for touch sensing areas. In the second conductive region, lower sheet resistance is used to ensure adequate electrical conductivity for lead wires and signal transmission areas.
Solution Approach 2:
The conductive film is divided into regions with different conductivity levels. This segmentation allows the system to achieve both high light transmittance in critical display areas and sufficient electrical conductivity in signal transmission areas, resolving the trade-off between optical and electrical performance.
Data Source
AI summary
The present disclosure relates to a conductive film, a touch assembly, and preparation methods thereof. The conductive film includes a base film and a conductive layer, and the conductive layer covers the base film. The conductive layer includes one or more conductive regions. At least one of the one or more conductive regions includes a conductive grid structure, and the conductive grid structure includes hollow grids and conductive grid lines.