Foldable Display Bending Structure for ESD Protection
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Solution Overview
Problem
Electrostatic discharge (ESD) in the bending area of display panels causes damage to wires, leading to defects in the display apparatus.
Innovation Solution
A display apparatus design that includes a display panel with a bending area protected by a first protective member and a second protective member with a lower modulus, where the second protective member fills the gap between the optical functional layer and the first protective member, made of a resin with specific viscosity and modulus, and is applied without overlapping the optical functional layer, to prevent ESD damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective member is disposed close to the optical functional layer to prevent ESD, then protection against ESD is improved, but interference with the optical functional layer increases
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the optical functional layer and the protective member. This buffer layer has a lower modulus than the protective member, allowing it to deform and absorb stress while preventing direct contact and interference between the protective member and the optical functional layer. The buffer layer thus mediates the interaction, enabling ESD protection while eliminating optical interference.
Solution Approach 2:
The protective member is designed with non-uniform thickness, being thicker in regions farther from the optical functional layer and thinner near the optical functional layer. This local variation in thickness allows the protective member to provide adequate ESD protection in areas where it is less likely to interfere with optical performance, while minimizing interference in critical optical regions.
2Reliability
If the protective member is made rigid to effectively prevent ESD damage, then protection effectiveness is improved, but stress distribution capability deteriorates
Solution Approach 1:
The protective structure is designed as a composite system consisting of a rigid protective member and a flexible buffer layer with different mechanical properties. The protective member provides rigidity for effective ESD protection, while the buffer layer provides flexibility for stress distribution. This composite structure combines the advantages of both rigid and flexible materials to achieve simultaneous protection effectiveness and stress distribution capability.
Solution Approach 2:
The modulus of the protective member is optimized to balance protection effectiveness and stress distribution. By carefully selecting the modulus value and thickness profile, the protective member maintains sufficient rigidity for ESD protection while having reduced stress concentration effects, thus achieving both protection effectiveness and stress distribution capability through parameter optimization.
Data Source
AI summary
A display apparatus includes a display panel including a display area, an adjacent area surrounding the display area, and a bending area extending from one side of the adjacent area, an optical functional layer disposed on the display panel, a first protective member disposed in the bending area and spaced apart from the optical functional layer in a first direction from the display area toward the bending area, and a second protective member disposed to fill a gap between the optical functional layer and the first protective member, where a modulus of the second protective member is less than a modulus of the first protective member.