Touch Sensor Segment Pattern Dividing Sensing Electrode
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Solution Overview
Problem
Large-area touch sensors face recognition issues due to visible segmental patterns formed for divided driving, which affect user perception and optical quality when integrated with display panels.
Innovation Solution
A touch sensor design featuring micro-etched patterns on the boundaries of sensing electrode units, with a segmental pattern etched in an island shape, matching the spatial frequency and width of the micro-etched patterns, to minimize recognition and enhance light transmittance, while allowing divided driving and easy application of the stitch exposure method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a segmental pattern is formed in a line shape to divide sensing electrode units for divided driving, then the touch sensor can be driven in divided areas, but the segmental pattern becomes visually distinguishable and is recognized by the user
Solution Approach 1:
The patent applies local quality by making the segmental pattern's width equal to or greater than the micro-etched pattern width at the boundary, and by shaping the unit transparent electrode boundary as a polygon with removed curve portions. This creates localized optical properties that match the surrounding micro-etched patterns, making the segmental pattern visually indistinguishable while maintaining divided driving functionality.
2Object-affected harmful factors
If the unit transparent electrode boundary is shaped with removed curve portions forming a polygon, then the segmental pattern matches the micro-etched pattern appearance, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the unit transparent electrode boundary into straight line portions connecting vertices of a polygon, with specific curve portions removed. This segmentation approach simplifies the manufacturing process by using straight lines instead of complex curves, reducing alignment precision requirements while maintaining the visual matching effect with micro-etched patterns.
Data Source
AI summary
A touch sensor includes a first sensing electrode unit formed on a substrate in a first direction and a second sensing electrode unit formed on the substrate in a second direction crossing the first direction. A plurality of micro-etched patterns are formed on a boundary of unit transparent electrodes constituting the first sensing electrode unit and the second sensing electrode unit. The unit transparent electrode has a shape in which a portion of a curve connecting vertices of a polygon is removed, and adjacent unit transparent electrodes are electrically connected to each other. It includes a segmental pattern dividing the first or second sensing electrode unit into two or more areas.