OLED Display Thermal Conductive Layer and Sealant Design
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Solution Overview
Problem
Conventional OLED displays face challenges in maintaining stable operations over long-term use due to issues with heat dissipation and moisture/oxygen penetration, which can lead to driving failures and reduced lifespan.
Innovation Solution
The OLED display design incorporates a thermal conductive layer made of the same material as the pixel defining layer, covered by a common electrode, and a second sealant with high thermal conductivity, such as epoxy resin and metal oxides, to efficiently dissipate heat and prevent moisture penetration between substrates, while a first sealant with UV curing properties bonds the substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional OLED display structure is used, then the display achieves high luminance and low power consumption, but the display experiences heat accumulation and unstable operations during long-term driving
Solution Approach 1:
A thermal conductive layer is introduced as an intermediary component between the driving driver and the common electrode. This layer mediates heat transfer from the driving driver to the common electrode, which then dissipates heat to the second substrate. The thermal conductive layer contains thermal conductive particles (such as aluminum oxide, silicon oxide, or boron nitride) dispersed in an encapsulant resin, providing a dedicated heat dissipation pathway that stabilizes operating temperature during long-term driving.
2Duration of action of moving object
If the OLED display operates for extended periods, then high luminance is maintained, but moisture and oxygen penetration occurs leading to driving failures
Solution Approach 1:
The encapsulation structure uses composite materials to provide both mechanical protection and environmental barrier functions. The first sealant (epoxy resin) bonds the first and second substrates, while the second sealant (encapsulant resin with thermal conductive particles) provides both encapsulation and heat dissipation. The pixel defining layer and common electrode also serve dual functions as both structural/electrical components and moisture barriers, creating a multi-functional composite structure that extends operational lifespan.
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 enhances heat dissipation efficiency, suppresses internal temperature increases, and improves the lifespan of the OLED display by protecting the driving driver from external factors, ensuring stable operation and reduced moisture penetration.
Implementation Method 1
a first sealant with UV curing properties bonds the substrates
Implementation Method 2
a thermal conductive layer made of the same material as the pixel defining layer, covered by a common electrode, and a second sealant with high thermal conductivity, such as epoxy resin and metal oxides, to efficiently dissipate heat
Data Source
AI summary
An organic light emitting diode (OLED) display and a method of manufacturing the same are provided. The OLED display includes: a first substrate; a second substrate; a thin film transistor and a driving driver on the first substrate; an organic light emitting element including a pixel electrode, an organic emission layer, and a common electrode; a pixel defining layer; a thermal conductive layer covering the driving driver; and a first sealant along an outer edge of the first substrate and the second substrate.