Flexible Display Bending Reinforcement for Crack Resistance
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Solution Overview
Problem
The reduction of bezel area in flexible display apparatus leads to increased stress on bending portions, causing cracks and operational defects due to reduced curvature radius and increased tension on signal lines.
Innovation Solution
Incorporation of a reinforcement member with a rigid part below the substrate in the bending portion, enhancing the rigidity of the display apparatus to minimize cracks and ensure flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel area is reduced by bending the non-display area of the substrate, then the effective display screen size is increased, but the radius of curvature of the bending portion decreases and stress on the lines increases causing cracks
Solution Approach 1:
The patent applies a reinforcement member with different mechanical properties (higher modulus) specifically in the bending portion of the substrate, while the rest of the substrate maintains its flexible properties. This local differentiation allows the bending area to have enhanced crack resistance without compromising the overall flexibility needed for bezel reduction.
Solution Approach 2:
The patent creates a composite structure by combining the flexible substrate material with a reinforcement member made of material having a larger modulus. This composite construction in the bending portion provides both flexibility for bending and sufficient rigidity to prevent line cracks and operational defects.
2Area of stationary object
If the radius of curvature of the bending portion is decreased to reduce bezel area, then the compactness is improved, but the stress applied to lines on the bending portion increases
Solution Approach 1:
The reinforcement member is specifically positioned in the bending portion where stress concentration occurs, providing localized stress relief. This allows the design to achieve compact bezel area with small radius of curvature without subjecting the lines to excessive stress that would cause cracks.
3Adaptability or versatility
If the substrate is made flexible to maintain display performance when bent, then the adaptability is improved, but the rigidity is reduced leading to increased susceptibility to damage
Solution Approach 1:
The substrate is designed with spatially varying mechanical properties: the non-bending areas maintain high flexibility for adaptability, while the bending portion incorporates a reinforcement member that provides enhanced strength and damage resistance. This local differentiation resolves the contradiction between flexibility and strength.
Solution Approach 2:
The patent employs a composite structure where the flexible substrate is combined with a reinforcement member in the bending portion. This composite design maintains the overall flexibility needed for bending while providing localized strength enhancement to resist damage from external forces.
Data Source
AI summary
A display apparatus includes a substrate comprising a display area, and a non-display area comprising a bending portion. The display apparatus further includes a support member disposed below the substrate in the display area. The display apparatus further includes a micro-coating layer disposed on the substrate in the bending portion. The display apparatus further includes a reinforcement member disposed below the substrate in the bending portion. The reinforcement member comprises a rigid part.