Cover Window Coating Layout for Stronger Display Bending Areas
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Solution Overview
Problem
Display devices with curved surfaces are more vulnerable to external impacts than flat areas, necessitating an improvement in the strength of the bending areas to enhance durability.
Innovation Solution
A cover window with a base layer having a bending portion and flat portions, where a first coating portion with a lower modulus than the base layer is applied specifically on the bending area, and additional coating portions with varying moduli are applied on the flat areas to distribute impact effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a curved surface is used for the display device, then the display device provides a modern aesthetic appeal and flexibility, but the bending area becomes more vulnerable to external impacts
Solution Approach 1:
The patent applies a coating portion with a lower modulus than the base layer specifically to the bending area of the curved surface. This creates local quality differentiation where the bending area has enhanced impact resistance properties compared to the rest of the cover window, directly resolving the vulnerability of the curved surface without compromising the overall shape.
Solution Approach 2:
The patent combines the base layer (glass or plastic) with a coating portion made of different material having a lower modulus. This composite structure allows the bending area to have superior impact resistance properties while maintaining the desired curved shape, effectively resolving the contradiction between shape and strength.
2Strength
If a coating portion with lower modulus is applied on the bending area, then the strength of the bending area is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the coating application process by applying the coating portion only to the bending area rather than the entire cover window. This selective segmentation reduces material usage and simplifies the manufacturing process while still achieving the strength improvement in the critical bending area.
Solution Approach 2:
The patent utilizes the parameter of modulus difference between the base layer and coating portion to achieve the strength improvement. By carefully selecting materials with appropriate modulus values, the patent enhances bending area strength through a controlled parameter change rather than complex structural modifications.
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 enhances the strength of the cover window and thus the display device, particularly in the bending area, by absorbing and distributing external impacts, while maintaining aesthetic appeal and clarity.
Implementation Method 1
a first coating portion disposed on the bending portion and having a first modulus less than a modulus of the base layer
Data Source
AI summary
A cover window includes a base layer including a bending portion bent about a bending axis extending in one direction, a first flat portion, and a second flat portion spaced apart from the first flat portion with the bending portion interposed therebetween in a direction crossing the one direction and facing each other and a first coating portion disposed on the bending portion and having a first modulus less than a modulus of the base layer.