Bendable Display Pad Layout With Grooved Wire Isolation
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Solution Overview
Problem
Display devices face challenges with increased damage and short-circuit probability due to modulus differences between stacked insulation layers when bent, and existing designs struggle to minimize the pad area while maintaining performance.
Innovation Solution
A display device with a substrate featuring a display area and a pad area that includes a bending groove with a cutoff portion between peripheral wires, formed from the same material as the insulating layer, which reduces the likelihood of damage and short circuits by minimizing material residue in the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pad area is reduced to increase display area, then the display area ratio is improved, but the risk of short circuit between peripheral wires increases
Solution Approach 1:
The insulating layer is segmented by forming bending grooves that divide it into multiple regions. These grooves create physical separations between adjacent peripheral wires, preventing direct contact and potential short circuits while allowing the pad area to be minimized.
Solution Approach 2:
The bending groove acts as an intermediary insulating structure between adjacent peripheral wires. By introducing this intermediate element, the patent ensures electrical isolation between wires that would otherwise be in close proximity due to the reduced pad area.
2Reliability
If insulation layers are stacked to provide electrical isolation, then the short circuit prevention is improved, but the modulus difference between layers causes damage during bending
Solution Approach 1:
Instead of using multiple stacked insulating layers throughout the entire structure, the patent applies insulating material locally only where needed - specifically in the bending grooves between peripheral wires. This localized approach provides electrical isolation where required while avoiding the bending damage issues associated with multiple stacked layers across the entire device.
Solution Approach 2:
The patent extracts the essential function of electrical isolation from the context of multiple stacked layers and implements it through a simplified single-layer structure with bending grooves. This removes the harmful modulus differences between multiple layers while preserving the necessary insulation function.
3Reliability
If the insulating layer is continuous to provide uniform protection, then the electrical isolation is improved, but the material residue in bending areas causes damage during bending
Solution Approach 1:
The patent removes the insulating material from the bending areas by forming grooves, extracting only the portions that would cause damage during bending. This leaves the insulating layer continuous in non-bending areas for electrical isolation while eliminating material residue in bending zones that would otherwise cause damage.
Solution Approach 2:
The continuous insulating layer is segmented by removing material in bending grooves, creating a discontinuous structure that is optimized for both electrical isolation and bending durability. The segmentation allows the insulator to maintain its protective function where needed while avoiding damage in bending regions.
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a substrate including a display area, the display area including a plurality of pixels configured to display an image and a pad area adjacent to the pad area and configured to transfer electrical signals. At least a portion of the pad area is bendable. The display device also includes an insulating layer formed over the substrate and including a bending groove in the pad area. The bending groove includes a sidewall. A plurality of peripheral wires is formed over the insulating layer, and a cutoff portion is connected to the sidewall and disposed between adjacent peripheral wires.


