Flexible Cover Window Resin Filling for Folded Display
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Solution Overview
Problem
Conventional flexible cover windows for displays face issues with visibility due to reflection at the boundary surface of glass, mechanical strength, and image distortion, especially when folded repeatedly, as they are prone to damage and have limitations in thickness that affect durability and image quality.
Innovation Solution
A flexible cover window composed of a composite material of glass and transparent resin, where the folding part is filled with transparent resin material and coated with a functional layer, minimizing reflection and maintaining the optical properties of glass while enhancing strength and folding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass-based cover window is used to improve mechanical strength and durability, then strength is improved, but visibility deteriorates due to reflection at boundary surface
Solution Approach 1:
A resin layer is introduced as an intermediary material between the glass cover window and the display panel. This resin layer fills the space that would otherwise create air gaps and refractive index differences, eliminating the boundary reflection effect while maintaining the mechanical strength benefits of glass.
Solution Approach 2:
The cover window structure is transformed from a single glass material to a composite structure combining glass and resin. The glass provides mechanical strength and durability, while the resin provides optical compatibility and eliminates boundary reflections, creating a composite system that achieves both strength and visibility requirements.
2Strength
If glass thickness is increased to improve strength, then strength is improved, but folding properties deteriorate
Solution Approach 1:
The cover window structure is designed with non-uniform thickness distribution. The glass layer is thinner at the folding line to enable bending, while being thicker at the plane area to maintain mechanical strength and protective function. This local variation in thickness allows the structure to adapt to different functional requirements in different regions.
3Adaptability or versatility
If folding part is made thinner to improve folding properties, then folding properties are improved, but image quality deteriorates due to air layer and refractive index difference
Solution Approach 1:
The resin layer serves as an intermediary that fills the space between the folded glass cover window and the display panel. This eliminates air gaps that would otherwise create refractive index differences and cause image distortion, ensuring high image quality even when the glass is folded at reduced thickness.
4Adaptability or versatility
If polymer film is used to improve flexibility, then folding properties are improved, but mechanical strength deteriorates
Solution Approach 1:
The cover window structure combines glass and resin materials to achieve both flexibility and strength. The glass provides the necessary mechanical strength and durability, while the resin layer and the folding design enable flexibility and repeated bending without damage, creating a composite system that overcomes the limitations of using either material alone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves visibility, mechanical strength, and folding durability by eliminating thickness limitations, reducing screen distortion, and maintaining high-quality display performance.
Implementation Method 1
visibility of a boundary part of a folding part, that is, visibility of a boundary part to the naked eye due to the reflection of a boundary surface of glass is minimized
Implementation Method 2
space (an air layer) is formed between the folding part and the surface of the display panel, which causes the problem of distortion of image quality due to difference in a refractive index between glass and the air layer
Data Source
AI summary
A cover window is proposed. Particularly, a flexible cover window having improved visibility for a flexible display is proposed, the flexible cover window including: a first window made of glass and provided on an upper part of a first surface of the flexible display; a second window made of glass and provided on an upper part of a second surface of the flexible display; and a folding part provided between the first window and the second window by corresponding to a folding area of the display and filled with a transparent resin material, wherein a transparent resin layer is provided on a total surface of each of the first window and the second window by continuing to the folding part filled with the transparent resin material.