Multilayer Display Cover Structure for Bendable Circuit Protection
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Solution Overview
Problem
Existing display apparatuses face challenges in bending and stretching without damaging internal circuits, particularly due to mechanical stress on metal lines during deformation.
Innovation Solution
A multilayer cover structure with progressively increasing modulus away from the display panel, incorporating rigid regions and flexible interconnects, along with adhesive layers of varying mechanical properties, supports the display panel and prevents damage to circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display apparatus uses a uniform rigid structure to protect circuits, then circuit protection is improved, but the ability to bend and stretch is reduced
Solution Approach 1:
The cover structure is divided into multiple layers with different moduli (first cover layer with higher modulus, second cover layer with lower modulus). This segmentation allows the rigid first layer to protect circuits while the flexible second layer enables bending and stretching, resolving the contradiction between circuit protection and deformability.
Solution Approach 2:
Different regions of the cover structure have different mechanical properties - the first cover layer has higher modulus for circuit protection in specific areas, while the second cover layer has lower modulus for overall flexibility. This local differentiation of material properties allows simultaneous achievement of protection and adaptability.
2Adaptability or versatility
If the display apparatus uses a flexible structure to enable bending and stretching, then adaptability is improved, but circuit protection is reduced
Solution Approach 1:
The cover is segmented into multiple functional layers where the first cover layer (higher modulus) provides circuit protection and the second cover layer (lower modulus) provides flexibility. This layered segmentation resolves the contradiction by assigning different functions to different segments.
Solution Approach 2:
The cover structure uses composite material design with layers of different moduli - combining rigid material characteristics in the first layer for protection and flexible material characteristics in the second layer for deformability, achieving both circuit protection and bending capability simultaneously.
3Reliability
If metal circuit lines are placed throughout the entire structure, then electrical connectivity is improved, but mechanical stress during deformation increases
Solution Approach 1:
Metal circuit lines are selectively placed only in rigid regions (first cover layer area) rather than throughout the entire structure. This local placement ensures electrical connectivity where needed while avoiding high-stress flexible regions, reducing mechanical stress on the circuits during deformation.
Solution Approach 2:
The first cover layer acts as an intermediary structure that provides rigid support for metal circuit lines, isolating them from mechanical stress in the flexible second cover layer region. This intermediary rigid layer protects the circuits from deformation-induced stress while maintaining connectivity.
Data Source
AI summary
A display apparatus according to one embodiment of the present disclosure includes a panel support layer, a display panel disposed on the panel support layer, a panel cover layer disposed on the display panel, and a first cover layer disposed on the panel cover layer. The first cover layer has a greater modulus than the panel cover layer. By arranging the cover layers in this manner, with varying mechanical properties, the display apparatus can achieve improved flexibility and durability. This configuration enables the apparatus to bend or stretch while reducing the risk of damage to the display panel or internal components.