Curved Touch Window Insulating Layer Segmentation for Alignment
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Solution Overview
Problem
The alignment of sensing electrodes, insulating layers, and bridge electrodes in touch windows is challenging due to the presence of an insulating layer, leading to misalignment and improper connection between the second sensing electrodes and bridge electrodes, which affects the touch detection accuracy.
Innovation Solution
The touch window design includes an insulating layer with open parts that expose the second sensing electrodes, allowing precise alignment and connection of bridge electrodes, ensuring accurate touch detection by patterning the insulating layer to match the electrode layout and using a blocking layer to improve visibility and reduce light reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is interposed between the second sensing electrodes and bridge electrodes, then electrical insulation is provided, but alignment difficulty increases and connection reliability deteriorates
Solution Approach 1:
The insulating layer is segmented by forming open parts that divide the continuous insulating layer into separate regions. This segmentation allows the bridge electrode to be directly exposed in specific areas, enabling precise alignment and reliable connection while maintaining electrical insulation in other regions. The open parts act as designated connection zones that simplify the alignment process between the bridge electrode and second sensing electrode.
Solution Approach 2:
The open parts of the insulating layer serve as intermediary connection zones between the bridge electrode and second sensing electrode. By creating these controlled openings, the design provides a mediator that facilitates direct electrical connection where needed while maintaining the overall insulating function. This intermediary approach resolves the conflict between needing insulation and needing reliable connection points.
2Measurement precision
If the insulating layer completely covers the electrodes, then electrical insulation is maximized, but touch detection accuracy deteriorates due to misalignment
Solution Approach 1:
The insulating layer is divided into covered regions and open parts through segmentation. The open parts are strategically positioned to expose the bridge electrode, creating clear alignment reference points that simplify the manufacturing process. This segmentation reduces alignment complexity by providing distinct visual and functional markers for precise electrode positioning, thereby improving touch detection accuracy.
Solution Approach 2:
The open parts of the insulating layer create visual contrast that aids in alignment during manufacturing. By having areas where the insulating layer is present and areas where it is absent (open parts), the design provides visual cues that simplify the alignment process. This visual differentiation reduces alignment complexity and improves measurement precision by making it easier to identify correct positioning.
3Ease of manufacture
If the insulating layer is fully continuous, then electrical insulation is maintained, but manufacturing complexity increases due to alignment difficulties
Solution Approach 1:
The continuous insulating layer is segmented by creating open parts that expose the bridge electrode. This segmentation actually simplifies manufacturing by providing clear alignment markers and reducing the complexity of aligning multiple layers. The open parts serve as natural registration features that guide the positioning of the bridge electrode relative to the second sensing electrode, thereby improving both manufacturing ease and connection reliability.
Solution Approach 2:
The insulating layer is extracted or removed in specific regions to create open parts. By taking out portions of the insulating layer where connections are needed, the design simplifies the manufacturing process by providing exposed alignment features. This extraction approach maintains electrical insulation in the covered regions while enabling reliable connections at the open parts without increasing overall manufacturing complexity.
Data Source
AI summary
The touch window includes a substrate divided into an active area and an unactive area; a first sensing electrode extending in a first direction on the active area of the substrate and including a plurality of first electrode parts and a connection part; a second sensing electrode extending in a second direction different from the first direction on the active area of the substrate and including a plurality of second electrode parts; an insulating layer disposed on top surfaces of the first electrode part of the first sensing electrode and the connection part to expose the second electrode part of the second sensing electrode; and a bridge electrode disposed on the insulating layer and connected to the exposed second electrode part of the second sensing electrode, wherein the insulating layer includes an open part.