UV-Curable Sealant System for OLED Bezel Minimization
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Solution Overview
Problem
Organic light emitting display devices face challenges in minimizing dead space and ensuring waterproofing and durability, as existing sealants can be damaged by high-temperature curing processes and have insufficient moisture barrier properties.
Innovation Solution
A three- or four-element structured sealant system is implemented, comprising a UV-curable organic sealant, an inorganic layer (such as AlO2 or TiO2) outside the organic sealant, and an elastic member outside the inorganic layer, which provides sufficient waterproofing and crack protection without requiring additional space for sealant formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealant is used and cured by high-temperature process, then the sealant can be formed, but the sealant is damaged and loses waterproofing capability
Solution Approach 1:
The curing method is changed from high-temperature thermal curing to UV light curing. This parameter change allows the sealant to be cured at low temperature, preventing damage to the organic light emitting element while still achieving complete curing and maintaining waterproofing capability
Solution Approach 2:
The thermal curing mechanism is replaced with UV light curing mechanism. Instead of using heat to cure the sealant, UV light is used to initiate polymerization, which eliminates the high-temperature damage to the sealant and the organic light emitting element while achieving effective curing
2Reliability
If sealant is formed to cover the thin film transistor layer, then waterproofing is improved, but the dead space increases and bezel size enlarges
Solution Approach 1:
The sealant is applied preliminarily only in the non-pixel area along the edge of the pixel array, before considering the need for additional coverage. This preliminary positioning allows the sealant to provide waterproofing at the critical edge regions without extending into the pixel area, thus minimizing dead space and bezel size while maintaining effective waterproofing
3Device complexity
If a single-layer sealant is used, then the device complexity is reduced, but the durability and crack resistance are insufficient
Solution Approach 1:
The sealant is designed as a composite structure with multiple layers: a first sealant layer applied in the non-pixel area, and a second sealant layer applied in the pixel area. This composite structure provides enhanced durability and crack resistance compared to a single-layer sealant, while the layered design allows each layer to be optimized for its specific functional requirements
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
This configuration minimizes bezel size, prevents moisture permeation, and enhances the durability of the organic light emitting display device by using a dual or quad-layer structure that includes a UV-curable organic sealant, a high-waterproofing inorganic layer, and an elastic member to absorb external impacts, thereby extending the device's lifespan.
Implementation Method 1
curing the organic sealant by irradiating ultraviolet rays to the organic sealant
Data Source
AI summary
An organic light emitting display device according to an exemplary embodiment of the present disclosure includes: a first substrate provided with a thin film transistor layer where a plurality of pixels are formed; a second substrate covering the first substrate; and a sealant formed along edges of the first and second substrates to bond both of the first and second substrates, wherein the sealant is formed above the thin film transistor of the first substrate, the sealant comprises an organic sealant and a protection member formed outside of the organic sealant, and the protection member is formed of a dual layer of an inorganic layer and an elastic member.