Conductive Pattern Segmentation for Touch Panel Visibility
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Solution Overview
Problem
Existing touch panels with transparent conductive films face challenges in large-scale manufacturing due to high resistance and visibility issues, particularly in near-field displays, where the pitch of conductive patterns is inconvenient and interferes with pixel display and user interaction.
Innovation Solution
A conductive substrate with a transparent substrate and a conductive pattern featuring conductive lines spaced 15 μm or less, along with line breakage portions at angles of 80 to 110°, to enhance concealment and reduce visibility, while maintaining effective electrical isolation and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent conductive film (ITO) is used in large-scale displays, then conductivity is improved, but visibility increases and cost increases rapidly
Solution Approach 1:
The conductive pattern is segmented into multiple lines with specific pitch relationships. By dividing the conductive structure into multiple parallel lines where the pitch between adjacent lines is 0.5 times or less the line width, the overall visibility is reduced while maintaining conductivity through the distributed conductive paths.
Solution Approach 2:
The invention changes the geometric parameters of the conductive pattern by establishing specific relationships between line width, pitch, and the number of lines. By controlling the pitch to be 0.5 times or less the line width and arranging multiple lines, the optical properties (visibility) are improved while electrical properties (conductivity) are maintained.
2Ease of manufacture
If pitch is determined by line width calculation for transmittance, then manufacturing is simplified, but visibility problems occur in near-field displays
Solution Approach 1:
The invention establishes a new parameter relationship where pitch = 0.5 times or less the line width, replacing the conventional approach of determining pitch solely by transmittance calculations. This parameter change effectively reduces visibility in near-field conditions while maintaining a systematic manufacturing approach.
3Reliability
If metal pattern is used to overcome ITO resistance, then conductivity is improved, but visibility and interference with pixel display increase
Solution Approach 1:
The metal conductive pattern is divided into multiple parallel lines with carefully controlled spacing. This segmentation reduces the visibility of individual metal lines and minimizes pixel interference while the collective arrangement maintains the required conductivity levels.
Solution Approach 2:
The conductive pattern uses different geometric configurations in different regions. By varying the number of lines, their spacing, and dimensions locally, the pattern achieves optimal balance between conductivity and visibility reduction in specific display zones.
Data Source
AI summary
The present invention relates to a conductive substrate comprising a conductive pattern having an improved concealment property and a touch panel comprising the same, and the conductive substrate according to the present invention comprises: a transparent substrate, and a conductive pattern comprising a conductive line provided on the transparent substrate, wherein the conductive pattern comprises two or more conductive lines spaced from each other in a longitudinal direction of the conductive line, and a distance between nearest-adjacent ends of two or more conductive lines spaced from each other is 15 μm or less. The conductive substrate according to the present invention can more efficiently conceal a metal line comprised in the conductive pattern.