OLED Display Dual-Seal System for Moisture and Impact Resistance
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Solution Overview
Problem
OLED displays face degradation due to environmental oxygen and moisture ingress, and existing sealants like glass frit are fragile, leading to reliability issues and mechanical weakness, especially when subjected to external impacts.
Innovation Solution
A dual-seal system is implemented, where a first seal of glass frit is used between the substrates to prevent moisture and oxygen ingress, and a second seal of epoxy resin is applied around the driver area to enhance mechanical strength and reliability, with the epoxy resin overlapping the first seal and conductive layer to improve adhesion and sealing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass frit is used as a sealant to prevent moisture and oxygen ingress, then sealing effectiveness is improved, but mechanical strength and reliability deteriorate due to fragility under external impacts
Solution Approach 1:
The patent applies composite materials by combining glass frit and epoxy resin as sealants. The glass frit provides effective sealing against moisture and oxygen, while the epoxy resin adds mechanical strength and flexibility to withstand external impacts. This composite approach resolves the contradiction by integrating the advantages of both materials to achieve both sealing effectiveness and mechanical durability.
2Reliability
If glass frit seal is applied to seal substrates, then environmental sealing is improved, but device complexity increases due to the need for additional absorbent materials
Solution Approach 1:
The epoxy resin serves multiple functions: it acts as a sealant providing environmental sealing like glass frit, and simultaneously provides mechanical strength and flexibility. This multi-functionality eliminates the need for separate absorbent materials, thereby reducing device complexity while maintaining effective environmental sealing.
3Productivity
If laser or infrared radiation is used to cure glass frit seal, then sealing process efficiency is improved, but harmful effects increase due to potential damage to other display components
Solution Approach 1:
The epoxy resin is designed to be cured at lower temperatures compared to glass frit, using conventional curing methods instead of high-energy laser or infrared radiation. This approach maintains sealing process efficiency while avoiding the harmful high-energy radiation that could damage other display components, effectively replacing the problematic curing method with a gentler alternative.
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 dual-seal system effectively prevents environmental damage and enhances the mechanical strength of OLED displays, ensuring reliability even under impact, by combining the sealing effectiveness of glass frit with the robustness of epoxy resin.
Implementation Method 1
OLED displays are sealed with an inorganic sealant, such as glass frit
Implementation Method 2
laser or infrared radiation is used to cure the fit seal
Implementation Method 3
laser or infrared radiation is used to cure the fit seal
Implementation Method 4
a second seal of epoxy resin is applied around the driver area to enhance mechanical strength and reliability
Data Source
AI summary
An organic light-emitting diode (OLED) display and method of fabricating the same are disclosed. In one aspect, the OLED display includes a first substrate including a display area and a peripheral area surrounding the display area. The display area includes a plurality of pixels each including an OLED and the peripheral area includes a signal driver electrically connected to the pixels. A conductive layer is formed over the signal driver and on opposing sides of the signal driver and a second substrate is formed over the first substrate. The OLED display further includes a first seal interposed between the first and second substrates in the peripheral area and substantially sealing the first and second substrates and a second seal surrounding the first seal and formed over the signal driver.