Curved Display Substrate Corner Design for Wrinkle-Free Bonding
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Solution Overview
Problem
Curved screens, particularly four-edge curved screens, face issues with wrinkles at the joints between adjacent curved parts, leading to metal wiring and inorganic layer breakage, which compromises product quality.
Innovation Solution
A display substrate design featuring corner display regions with a composite wiring layer and drive structure layer, where the composite wiring layer is positioned below the drive structure layer, and blank corner cutting regions without signal wiring, allowing the corner display regions to compress and eliminate wrinkles during bonding without breaking metal wiring or inorganic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If curved screens with adjacent curved parts are used to increase display area and screen-to-body ratio, then the display area and sensory experience are improved, but wrinkles appear at the joints between adjacent curved parts causing metal wiring and inorganic layer to break
Solution Approach 1:
The corner region is segmented into a corner display region and a blank corner cutting region. The blank corner cutting region is removed to eliminate the joint between adjacent curved parts, thereby preventing wrinkle formation and layer breakage while maintaining the curved display area.
Solution Approach 2:
The blank corner cutting region is extracted and removed from the corner display region. This extraction eliminates the problematic joint area where wrinkles and breakages occur, allowing the curved parts to be bonded without adjacent curved parts meeting at the corner.
2Strength
If composite wiring layer is disposed below drive structure layer in corner display region, then metal wiring breakage is prevented during bonding, but the manufacturing process becomes more complex
Solution Approach 1:
The wiring structure transitions from a planar arrangement to a multi-layer stacked arrangement in the corner display region. The composite wiring layer is positioned below the drive structure layer, creating a vertical dimension that protects metal wiring from breakage during bonding while maintaining electrical connectivity.
3Stability of the object's composition
If blank corner cutting region is removed to eliminate wrinkles, then wrinkle formation is prevented, but the manufacturing process requires additional removal steps
Solution Approach 1:
The blank corner cutting region is removed in advance during the substrate preparation process, before the bonding process. This preliminary action prevents wrinkle formation during bonding, as the problematic joint area is already eliminated. The removal is performed as a preliminary step to ensure wrinkle-free bonding without requiring additional corrective steps later.
Data Source
AI summary
Provided are a display substrate, a preparation method thereof, a method for bonding a display panel, and a display apparatus. The display substrate includes a display region and a bezel region, the display region includes multiple corner regions and the corner regions include a corner display region and a blank corner cutting region which are alternately disposed. The corner display region includes a composite wiring layer disposed on a base substrate, a drive structure layer disposed on the composite wiring layer and light-emitting elements disposed on the drive structure layer. The composite wiring layer includes a first wiring layer, a second wiring layer and a first insulating layer disposed between the first wiring layer and the second wiring layer. The drive structure layer includes a pixel drive circuit and multiple connection electrodes. The first wiring layer includes a gate line, and the second wiring layer includes a data line.