Bendable Display Wiring Layout for Stress and Delamination Control
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Solution Overview
Problem
Display apparatuses with bendable characteristics face manufacturing defects and reduced lifetimes due to stress concentration during bending, leading to potential disconnections and cracks in wires.
Innovation Solution
Incorporating a substrate with a bending area featuring a first wire unit, a dummy wire unit, and an organic layer, where the wires and dummy wires are spaced apart by specific pitches and include holes to distribute stress evenly, and an insulating film covers the dummy wires' ends to prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus is bent to increase visibility from various angles, then adaptability is improved, but reliability deteriorates due to stress concentration causing wire disconnections and cracks
Solution Approach 1:
The wire structure is segmented into multiple sub-wires within each wire unit. This segmentation distributes the stress that would otherwise concentrate on a single continuous wire, reducing the risk of disconnection while maintaining electrical connectivity through the bent region
Solution Approach 2:
Different regions of the wire structure are given different properties: the bending area contains multiple sub-wires with specific pitch spacing to handle stress, while other areas maintain standard wire configurations. This local differentiation optimizes both flexibility in the bend zone and reliability in connection zones
2Reliability
If the pitch between wires in the bending area is reduced to distribute stress, then reliability is improved, but device complexity increases due to additional dummy wires and pitch variations
Solution Approach 1:
Dummy wire units are introduced as simplified copies of the actual wire units. These dummy wires replicate the pitch and spacing characteristics needed for stress distribution but do not require full electrical connectivity, reducing the overall complexity while maintaining the beneficial stress distribution effect
Solution Approach 2:
Instead of reducing the pitch of all wires throughout the entire display apparatus, the reduced pitch is applied only to the bending area where stress concentration occurs. This partial application of the pitch reduction minimizes the increase in device complexity while still achieving improved reliability where needed
Data Source
AI summary
A display apparatus includes a substrate, a display unit, a first wire unit, and a dummy unit. The substrate includes a first area, a second area, and a bending area. The bending area is disposed between a first area and a second area. The display unit is disposed in the first area. The first wire unit is electrically connected to the display unit and includes a plurality of first wires disposed on the substrate over the first area, the bending area, and the second area. The plurality of first wires include a plurality of holes disposed in the bending area and spaced apart from each other by a first pitch. The dummy wire unit includes a plurality of dummy wires disposed in the bending area.