Visible Light Curing Adhesive for OLED Plastic Cover
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Solution Overview
Problem
OLED devices with plastic covers face issues of reduced adhesive strength and visibility due to incomplete hardening of the adhesive layer caused by UV blockers, which prevent UV light from hardening the adhesive, leading to air gaps that deteriorate visibility and impact resistance.
Innovation Solution
An adhesive layer composed of 50–95 parts acryl-based copolymer resin, 4.7–44 parts acryl monomer, 0.1–2 parts cross-linking monomer, 0.1–2 parts visible light initiator, and 0.1–2 parts additive is filled between the plastic cover and the board assembly, allowing complete hardening and enhanced adhesion even with UV blockers, thereby improving visibility and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic cover containing UV blocker is used to protect the board assembly, then the durability and UV resistance are improved, but the adhesive layer cannot harden completely because UV light is blocked, resulting in reduced adhesive strength
Solution Approach 1:
The patent changes the curing mechanism parameter from UV light-dependent to visible light-dependent by using a visible light initiator instead of a UV initiator. This allows the adhesive to cure under visible light conditions, eliminating the conflict with UV blockers in the plastic cover while maintaining complete hardening and adhesive strength
Solution Approach 2:
The patent substitutes the UV light curing mechanism with a visible light curing mechanism. By replacing the UV initiator system with a visible light initiator system, the adhesive curing process is decoupled from UV light requirements, allowing the plastic cover with UV blocker to remain in place without preventing adhesive hardening
2Reliability
If an air gap is maintained between the board assembly and cover to buffer external impacts, then impact resistance is improved, but visibility deteriorates due to light reflection and refraction at the air gap interfaces
Solution Approach 1:
The patent uses an adhesive composition that is a composite material containing acryl-based copolymer resin, acryl monomer, cross-linking monomer, and visible light initiator. This composite adhesive system provides both the mechanical cushioning function to maintain impact resistance and the optical transparency to ensure visibility when filled in the air gap
Solution Approach 2:
The patent merges the adhesive function with the impact buffering function by filling the adhesive layer into the air gap space. The adhesive serves dual purposes: providing strong bonding between the board assembly and plastic cover, and simultaneously acting as a cushioning layer that absorbs external impacts while maintaining optical clarity for visibility
3Illumination intensity
If the adhesive layer is filled completely to eliminate air gaps and improve visibility, then visibility is improved, but the adhesive strength may be reduced due to incomplete hardening when UV blockers are present
Solution Approach 1:
The patent changes the curing wavelength parameter from UV range to visible light range by using a visible light initiator. This parameter change allows complete hardening of the adhesive layer even when UV blockers are present in the plastic cover, ensuring both full visibility and maximum adhesive strength are achieved simultaneously
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 complete filling of the adhesive layer, enhancing adhesion strength and visibility while preventing incomplete hardening, thus improving the overall performance and durability of OLED devices by dispersing external impacts.
Implementation Method 1
0.1 ̃2 parts by weight of a visible light initiator
Data Source
AI summary
An OLED device is discussed. The OLED device includes: a board assembly configured to include organic light emission elements; a plastic cover attached to the board assembly; and an adhesive layer filled between the board assembly and the plastic cover. The adhesive layer is formed from an adhesive composition which includes 50˜95 parts by weight of an acryl-based copolymer resin, 4.7˜44 parts by weight of an acryl monomer, 0.1˜2 parts by weight of a cross linking monomer, 0.1˜2 parts by weight of a visible light initiator, and 0.1˜2 parts by weight of an additive.