Curved Touch Panel Connection Electrodes Stress Distribution
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Solution Overview
Problem
Touch panels on curved surfaces often experience defects due to stress generated when transformed from a flat to a curved shape, leading to damage in wiring portions.
Innovation Solution
A touch panel design featuring a substrate with both planar and curved surface portions, where detection electrodes are arranged in multiple directions and connection electrodes with bent shapes to distribute stress, preventing damage and defects in the curved surface areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel is transformed from a flat plate shape into a curved surface shape, then the display apparatus can provide various shapes and flexible display capabilities, but defects in wiring portions may occur in the curved surface portion
Solution Approach 1:
The patent applies different patterns to connection electrodes in different regions: straight-line patterns in planar surface portions and bent patterns in curved surface portions. This local differentiation allows the wiring to adapt to the specific geometric requirements of each region, preventing defects in curved areas while maintaining simplicity in flat areas.
Solution Approach 2:
The connection electrodes in the curved surface portion are designed with bent patterns that follow the curvature of the surface. This curvature adaptation allows the wiring to conform to the bent geometry, distributing stress evenly and preventing the wiring defects that would occur with straight-line patterns on curved surfaces.
2Ease of manufacture
If connection electrodes are arranged in straight lines to simplify manufacturing, then the manufacturing process becomes easier, but stress concentration occurs in curved surface portions leading to defects
Solution Approach 1:
The patent implements a hybrid approach where connection electrodes use straight-line patterns in planar regions (maintaining manufacturing simplicity) and bent patterns in curved regions (reducing stress concentration). This localized differentiation resolves the contradiction by applying the appropriate pattern type to each specific region.
Solution Approach 2:
The bent pattern in curved surface portions converts the potential harm of complex manufacturing into a benefit by naturally distributing stress through the curved geometry. The increased manufacturing complexity is localized only to curved regions where it provides functional advantage.
Data Source
AI summary
A touch panel includes a substrate, detection electrodes, and connection electrodes. The substrate includes a planar surface portion and a curved surface portion adjacent to the planar surface portion in a first direction, the curved surface portion including an active region and another region disposed outside the active region. The detection electrodes are disposed on the substrate. The detection electrodes are arranged in the first direction and a second direction crossing the first direction. The connection electrodes electrically connect adjacent detection electrodes arranged in a same direction as one another. A connection electrode of the connection electrodes connecting detection electrodes adjacent to each other of the detection electrodes arranged in the first direction is disposed in the active region of the curved surface portion. The connection electrode includes a portion extending in a different direction than the first direction.