Curved Hard Coating Layer on Display Window
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Solution Overview
Problem
Display devices often suffer from flaws at the incision surface of the hard coating layer during the cutting process, leading to reduced visibility and contamination risks due to the diffusion of small flaws, which compromises their performance and reliability.
Innovation Solution
A display device with a window and a hard coating layer having a curved surface, where the active surface layer is either hydrophilic or hydrophobic, and the hard coating layer material has a surface energy higher or lower than the window, respectively, to prevent flaws during cutting by maintaining a contact angle between 0° and 90°, thereby reducing the likelihood of incision surface formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hard coating layer is formed on a window substrate and then cut into desired sizes, then the window can be obtained with the hard coating layer, but flaws are generated at the incision surface which may diffuse and deteriorate visibility or allow contamination
Solution Approach 1:
The hard coating layer is formed on the entire window mother substrate before cutting. This preliminary formation ensures that the coating is already in place on the areas that will become the final product, allowing the coating to be optimized for the cutting process and preventing flaws during fabrication.
Solution Approach 2:
The hard coating layer is designed to have a curved surface instead of a flat surface. This curvature modifies the stress distribution and surface properties during cutting, preventing the generation of flaws and micro-flaws at the incision surface that would otherwise compromise reliability.
2Strength
If the hard coating layer is made with high surface energy material, then adhesion to the window substrate is improved, but the contact angle becomes too large reducing the curved surface effect
Solution Approach 1:
The surface energy of the hard coating layer material is precisely controlled and optimized to fall within a specific range. This parameter optimization ensures that the material maintains sufficient adhesion to the window substrate while achieving the desired curved surface shape with appropriate contact angle (greater than 0° and less than 90°).
3Shape
If the hard coating layer is made with low surface energy material, then the curved surface shape is improved, but adhesion to the window substrate deteriorates
Solution Approach 1:
The surface energy of the hard coating layer material is precisely controlled and optimized to fall within a specific range. This parameter optimization ensures that the material maintains sufficient adhesion to the window substrate while achieving the desired curved surface shape with appropriate contact angle (greater than 0° and less than 90°).
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 effectively reduces the generation of flaws and micro-flaws on the incision surface, improving the yield and reliability of the display devices by preventing external contamination and maintaining visibility.
Implementation Method 1
the hard coating layer may include a material that is higher in surface energy than that of the window
Implementation Method 2
A surface of the hard coating layer may have a contact angle that is in a range of greater than 0° to less than 90° at each end portion of the window
Implementation Method 3
One of the surface treatments from among the first surface treatment and the second surface treatment may include a hydrophilic surface treatment
Implementation Method 4
the other one of the surface treatments from among the first surface treatment and the second surface treatment may include a hydrophobic surface treatment
Data Source
AI summary
A display device according to one or more exemplary embodiments of the present invention includes: a display panel; a window on the display panel; an active surface layer on the window; and a hard coating layer on the active surface layer and having a curved surface.