Cover Window Ion Exchange for Foldable Display Strength
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Solution Overview
Problem
Display devices face damage from bending due to insufficient strength of conventional cover windows, which lack effective protection mechanisms.
Innovation Solution
A chemically strengthened cover window is developed with a base layer and functional layers formed through an ion exchange process, featuring different ion compositions and thicknesses in various areas to enhance strength and flexibility, including a groove on the surface for foldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover window uses a conventional single-ion structure, then the manufacturing process is simple, but the strength and bending resistance are insufficient
Solution Approach 1:
The patent applies different ions (first ion in the first area, second ion in the second area) with different ionic radii to different regions of the functional layer. This local differentiation allows the cover window to achieve enhanced strength in specific areas while maintaining flexibility where needed, resolving the contradiction between overall strength and structural simplicity.
Solution Approach 2:
The functional layer is constructed as a composite structure containing multiple ion types (first ion and second ion with different ionic radii) within the same layer. This composite ion structure enables the material to exhibit both enhanced mechanical strength and controlled flexibility, overcoming the limitations of conventional single-ion glass compositions.
2Ease of operation
If the functional layer has uniform thickness, then the manufacturing process is simple, but the cover window lacks flexibility for folding
Solution Approach 1:
The functional layer is designed with non-uniform thickness, where the first area (requiring flexibility) has a different thickness than the second area. This local thickness variation enables the cover window to be folded at the first area while maintaining structural integrity in the second area, achieving foldability without compromising overall strength.
3Ease of manufacture
If different coating solutions are applied to different areas simultaneously, then the manufacturing process is simplified, but the ion distribution control becomes more difficult
Solution Approach 1:
The cover window surface is divided into distinct first and second areas, with each area receiving a specific coating solution containing its designated ion. This segmentation allows simultaneous coating operations while maintaining precise ion distribution control through spatial separation of the coating application zones.
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 significantly increases the strength of the cover window, preventing damage from bending and simplifying the manufacturing process by applying coating solutions and performing ion exchange simultaneously across the cover window's areas.
Implementation Method 1
applying a first coating solution including a first ion to at least one surface of the base member in a first area, the first area of the base member having flexibility, applying a second coating solution including a second ion different from the first ion to at least one surface of the base member in a second area disposed adjacent to the first area, heating the base member on which the first and second coating solutions are formed
Data Source
AI summary
A cover window includes a first area and a second area, a base layer disposed in the first area and the second area and having flexibility in the first area, and a functional layer disposed on at least one surface of the base layer and including: a first part disposed in the first area and including a first ion and a second part disposed in the second area and including a second ion different from the first ions.