Curved Encapsulation Unit for Light Emitting Device Protection
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Solution Overview
Problem
Light emitting devices face degradation due to moisture and oxygen exposure, leading to damage from contact with encapsulation units or getters, which affects their lifespan and performance.
Innovation Solution
A light emitting device design featuring an encapsulation unit with a first region having a positive curvature that projects away from the substrate, creating a space between the light emitting unit and the getter, thereby reducing the likelihood of contact and enhancing durability against external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light emitting device uses a sealing structure with an encapsulation unit to protect against moisture and oxygen, then the reliability is improved, but the device complexity increases due to additional components and assembly steps
Solution Approach 1:
The encapsulation unit integrates multiple protective functions into a single component. It combines the sealing function (protecting against moisture and oxygen) with the structural support function and the getter mounting function into one unified encapsulation unit, thereby improving reliability without proportionally increasing device complexity
Solution Approach 2:
The encapsulation unit serves multiple purposes simultaneously: it acts as a barrier against environmental contaminants (moisture and oxygen), provides structural support for the light emitting device, and serves as a mounting platform for the getter. This multi-functionality addresses the technical contradiction by delivering comprehensive protection while maintaining reasonable structural complexity
2Reliability
If the getter size is increased to improve moisture absorption, then the reliability is improved, but the device thickness increases
Solution Approach 1:
The patent employs a thin-film encapsulation unit that provides effective sealing and protection against moisture and oxygen penetration. This thin-film approach allows the device to achieve reliable environmental protection without increasing overall thickness, effectively resolving the contradiction between reliability improvement and thickness control
3Reliability
If external pressure is applied to the light emitting device, then the device may experience degradation due to contact between the light emitting unit and the encapsulation unit or getter, but increasing the space between them increases device thickness
Solution Approach 1:
The encapsulation unit is designed with a curved surface that arches over the light emitting unit, creating a dome-like protective structure. This curvature provides structural reinforcement against external pressure while maintaining a compact profile, preventing contact between the light emitting unit and encapsulation unit under pressure without significantly increasing device thickness
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 design effectively prevents degradation and damage from moisture and oxygen exposure, maintaining the device's performance and extending its lifespan while maintaining a manageable thickness.
Implementation Method 1
an encapsulation unit having a first region corresponding to the light emitting unit and a second region to couple with the substrate, wherein the encapsulation unit at the first region or a part of the encapsulation unit at the first region has a positive curvature that projects away from the substrate
Implementation Method 2
If the light emitting device is used for a long period of time, a thickness of the getter that absorbs moisture may become thick
Implementation Method 3
The encapsulation unit or an encapsulation substrate formed of metal, glass, plastic or the like may be connected to a lower substrate using a sealing material, such as a sealant, in order to encapsulate the internal elements
Data Source
AI summary
A light emitting device is provided that includes a substrate, a light emitting unit formed on the substrate, and an encapsulation unit. The encapsulation unit may include a first region corresponding to the light emitting unit and a second region coalesced with the substrate. The encapsulation unit of the first region or a part of the encapsulation unit of the first region may have a positive curvature.