Variable Thickness Cover Glass for Foldable Displays
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Solution Overview
Problem
Foldable display devices face challenges with the durability, material finish, and reliability of their cover glass, particularly due to the use of thin plastic and ultra-thin glass layers that are susceptible to warpage, scratching, and fracture.
Innovation Solution
A foldable display structure featuring a glass layer with variable thickness, created by grooves on the top and bottom faces, and an optically-clear adhesive underneath, allowing the glass layer to be exposed and enhancing durability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thin plastic and ultra-thin glass layers are used for cover glass, then the device can be made more flexible and suitable for foldable displays, but the durability, resistance to scratching and fracture, and material finish are compromised
Solution Approach 1:
The glass layer is designed with variable thickness, featuring grooves that create thinner regions at the fold line and thicker regions in non-fold areas. This local variation in thickness allows the glass to be flexible where needed while maintaining strength and durability in areas that require protection, thus resolving the contradiction between adaptability for folding and overall strength.
2Adaptability or versatility
If the glass layer is made thinner to enable folding, then flexibility is improved, but the reliability and resistance to warpage and fracture are reduced
Solution Approach 1:
By implementing grooves in the glass layer, the design creates locally thinner regions that enable folding while the overall glass layer maintains sufficient thickness in non-fold areas to ensure reliability and resistance to warpage and fracture. This localized thinning allows the glass to meet both folding requirements and reliability standards.
3Shape
If the glass layer is exposed to the external environment rather than being fully covered, then the material finish and perceived quality are improved, but the protection from environmental factors is reduced
Solution Approach 1:
The exposed glass layer with its variable thickness design acts as a flexible shell that maintains structural integrity while being exposed to the environment. The grooves create a profile that allows the glass to flex during folding while the exposed portions maintain a high-quality material finish, effectively balancing aesthetic requirements with environmental protection needs.
Data Source
AI summary
This document describes systems and techniques directed at user-exposed and variably-thick cover glass for foldable displays. In aspects, a foldable display structure includes a glass layer and an optically-clear adhesive disposed thereunder. The glass layer includes a first groove on a top face along a first plane and a second groove on a bottom face along the first plane. In implementations, the first groove and the second groove form a variable thickness in the glass layer along a dimension of the glass layer perpendicular to the first plane sufficient to define a foldable region. Through such an implementation, the glass layer may be exposed to an external environment, improving a durability, material-finish, and a reliability of foldable display structures.