Flexible Window Glass with Concave Folding Region
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Solution Overview
Problem
Flexible display devices require windows with excellent mechanical properties to maintain folding operations while providing impact resistance, which existing solutions fail to adequately address.
Innovation Solution
A window design featuring a bonding layer with a pencil hardness of at least 6 H, composed of tempered glass substrates with varying thicknesses and concave portions, allowing for improved folding and impact resistance by reducing the radius of curvature in the folding region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the glass substrate thickness is increased to improve impact resistance, then the impact resistance is improved, but the folding properties deteriorate due to increased radius of curvature
Solution Approach 1:
The glass substrate is divided into multiple thickness regions: a first region with greater thickness for impact resistance, and a second region with lesser thickness for flexible folding. This segmentation allows different portions of the glass substrate to serve different functional requirements simultaneously.
Solution Approach 2:
Different regions of the glass substrate are assigned different thicknesses according to their specific functional requirements. The first region has greater thickness to provide impact resistance where needed, while the second region has lesser thickness to enable flexible folding operations, creating local quality variations throughout the structure.
2Ease of operation
If the glass substrate thickness is reduced to improve folding properties, then the folding properties are improved, but the impact resistance deteriorates
Solution Approach 1:
The glass substrate is segmented into regions with different thicknesses, allowing the overall structure to maintain folding flexibility while specific thicker regions provide impact resistance. This resolves the contradiction by spatially separating the functions of flexibility and strength.
Solution Approach 2:
The glass substrate exhibits local quality variations in thickness to simultaneously achieve good folding properties in thinner regions and impact resistance in thicker regions, allowing both contradictory requirements to be satisfied in different locations.
3Device complexity
If a single-layer glass substrate is used to simplify the structure, then the device complexity is reduced, but the impact resistance deteriorates
Solution Approach 1:
The window assembly uses a composite structure with multiple glass substrates bonded together with a bonding layer. This composite construction provides enhanced impact resistance compared to single-layer glass, while the overall structure remains relatively simple and integrated.
Data Source
AI summary
A window includes a first glass substrate, a second glass substrate facing the first glass substrate, and a bonding layer disposed between the first glass substrate and the second glass substrate. The window includes a first non-folding portion, a second non-folding portion, and a folding portion, the folding portion is disposed between the first non-folding portion and the second non-folding portion, and at least one of the first glass substrate and the second glass substrate includes a concave portion corresponding to the folding portion and defined on a surface adjacent to the bonding layer.