OLED Packaging Heat Dissipation Layer for Thermal Management
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Solution Overview
Problem
OLED packaging structures face issues with light loss due to total internal reflection caused by different refractive indexes between layers, leading to heat generation and potential damage to the OLED.
Innovation Solution
Incorporating a heat dissipation layer, such as transparent graphene, within the packaging structure, which includes an organic layer and an inorganic layer, with the heat dissipation layer positioned away from the OLED and in contact with the organic layer, to dissipate heat and prevent excessive temperature buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a packaging layer with multiple thin films (inorganic and organic layers) is used to prevent water and oxygen permeation, then the service life of OLED is improved, but light loss due to total internal reflection occurs and heat is generated to damage the OLED
Solution Approach 1:
The patent converts the harmful heat generated by total internal reflection into a beneficial effect by introducing a heat dissipation layer. This layer absorbs and dissipates the heat, preventing OLED damage while maintaining the protective function of the packaging structure. The harmful heat is transformed from a damaging factor into a manageable thermal flow that can be controlled and dissipated effectively.
Solution Approach 2:
The heat dissipation layer acts as an intermediary between the packaging layer and the OLED. It receives the heat generated by total internal reflection at the packaging layer interfaces and transfers it away from the OLED, preventing direct heat damage. This intermediary layer resolves the contradiction by mediating the thermal interaction between the protective packaging and the sensitive OLED.
2Reliability
If multiple layers with different refractive indexes are combined for packaging, then water and oxygen isolation is improved, but total internal reflection occurs reducing light output
Solution Approach 1:
The patent converts the light loss from total internal reflection into a beneficial heat dissipation opportunity. By positioning the heat dissipation layer to receive the reflected light and convert it to heat that can be managed, the system transforms an optical loss into a controllable thermal management opportunity, maintaining both isolation performance and acceptable light output.
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 heat dissipation layer effectively prevents damage from excessive heat and improves the bonding between layers, enhancing the packaging structure's performance and extending the OLED's service life.
Implementation Method 1
a heat dissipation layer, such as transparent graphene, within the packaging structure... to dissipate heat and prevent excessive temperature buildup
Implementation Method 2
water vapor, oxygen and the like in the air have great impact on the service life of the OLED... it is necessary to effectively package the OLED to isolate functional layers of the device from the water vapor, oxygen and the like in the air
Implementation Method 3
when light passes through the layers directly, total internal reflection will occur at interfaces between the layers, which will reduce the output of light. Furthermore, this part of light will be converted into heat to damage the OLED
Data Source
AI summary
The present disclosure provides an OLED packaging structure and a manufacturing method thereof, and a display device comprising the packaging structure. The OLED packaging structure comprises a first substrate, an OLED disposed on the surface of the first substrate, and a packaging layer covering the OLED, wherein the packaging layer comprises a heat dissipation layer.