Coaxial Laser Patterning for Touch Panel Inactive Area
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Solution Overview
Problem
Current laser patterning methods for touch panels are inefficient, taking significantly longer to pattern the inactive area compared to the active area, which hampers production capacity and quality.
Innovation Solution
A laser-patterned touch panel design featuring a plurality of coaxial patterns on the inactive area, formed as continuous line segments with partial overlaps, surrounding the active area, allowing for efficient removal of the transparent conductive layer and reducing patterning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional laser patterning method is used on inactive area, then complete removal of transparent conductive layer is achieved, but patterning time is excessively long (3 minutes for 3.5'' touch panel)
Solution Approach 1:
The patent divides the inactive area patterning into multiple concentric ring patterns (first coaxial patterns, second coaxial patterns, third coaxial patterns) with different radial distances from the active area. This segmentation allows the laser to process different zones with optimized parameters, significantly reducing total patterning time from 3 minutes to under 1 minute while ensuring complete removal of the transparent conductive layer in each segment.
2Ease of manufacture
If laser patterning is performed on inactive area, then transparent conductive layer is removed, but laser energy accumulates at turning corners causing over-etching and quality issues
Solution Approach 1:
The patent applies different laser processing parameters to different spatial locations within the inactive area. The first coaxial patterns use one set of parameters, while the second and third coaxial patterns use adjusted parameters to compensate for laser energy accumulation at turning corners. This local quality adjustment ensures uniform etching depth and prevents over-etching, maintaining patterning quality across the entire inactive area.
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 approach significantly reduces the time required to pattern the inactive area, from 3 minutes to less than 1 minute, enhancing production capacity and maintaining quality by avoiding over-etching and minimizing laser energy accumulation at turning corners.
Implementation Method 1
Methods of patterning touch panels are mainly implemented by laser patterning
Data Source
AI summary
A laser patterning touch panel includes an active area, an inactive area, and a plurality of first coaxial patterns. The active area is disposed in a center area of the substrate. The inactive area does not overlap the active area and has a transparent conductive layer thereon. The plurality of first coaxial patterns are disposed on the transparent conductive layer and surround the active area. Each of the plurality of first coaxial patterns includes a continuous line segment with a width, and partially overlaps with a neighboring one of the first coaxial patterns.