Window Bonding Member for Curved Display Devices
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Solution Overview
Problem
Curved display devices face challenges in maintaining consistent bonding properties between the polarizing member and the cover window, particularly in curved areas, leading to potential separation and bubble formation due to varying modulus and creep properties of the window bonding member.
Innovation Solution
A window bonding member with a first portion on the flat area and second portions on the curved areas, where the modulus is greater than or equal to 0.61 MPa and creep properties are approximately 70%, and a penetration depth of equal to or less than 13 μm, is used, and is ultraviolet (UV) cured to enhance bonding and prevent separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a window bonding member is used to attach the polarizing member to the cover window in curved areas, then bonding is achieved, but the modulus varies between flat and curved areas leading to separation and bubble formation
Solution Approach 1:
The window bonding member is designed with different physical properties in different regions: the first portion in the flat area has a penetration depth of 15 μm or less, while the second portions in the curved areas have a penetration depth of 25 μm or less. This local differentiation compensates for the varying modulus in curved areas, preventing separation and bubble formation while maintaining reliable bonding across the entire display device.
2Strength
If the penetration depth of the window bonding member is reduced to prevent separation, then bonding strength is improved, but the ability to accommodate curved areas is reduced
Solution Approach 1:
The window bonding member is designed with different penetration depths in different regions: the first portion in the flat area has a penetration depth of 15 μm or less for strong bonding, while the second portions in the curved areas have a penetration depth of 25 μm or less to accommodate the curvature. This local differentiation allows the bonding member to simultaneously achieve strong bonding in flat areas and adaptability in curved areas.
3Adaptability or versatility
If the window bonding member has high creep properties to allow deformation in curved areas, then adaptability is improved, but bonding stability is reduced
Solution Approach 1:
The window bonding member is designed with different penetration depths in different regions, which indirectly controls creep properties. The first portion in the flat area has a penetration depth of 15 μm or less for stable bonding, while the second portions in the curved areas have a penetration depth of 25 μm or less to allow necessary deformation. This local differentiation maintains bonding stability in flat areas while providing adaptability in curved areas.
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 ensures a strong and consistent adhesive bond between the polarizing member and the cover window, preventing separation and bubble formation in curved areas, while maintaining optimal modulus and creep properties for the display device.
Implementation Method 1
The window bonding member may be ultraviolet ray (UV) cured.
Data Source
AI summary
A display device including: a display panel; a polarizing member overlapping the display panel; a cover window overlapping the polarizing member; and a window bonding member disposed between the polarizing member and the cover window, wherein a penetration depth of the window bonding member that is measured by an indentation tester is equal to or less than approximately 13 μm.