OLED Cathode Heat Radiation Section Design
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Solution Overview
Problem
Organic light emitting displays face heat generation issues due to low thermal conductivity substrates, leading to reduced light emission efficiency and shortened lifetimes, as existing heat radiation methods are insufficient in effectively dissipating heat from the organic light emitting layer.
Innovation Solution
Extending a part of the second electrode (cathode) outside the encapsulated area to function as a radiation section, which shortens the heat conduction distance and promotes thermal diffusion, using the same metal layer for the electrode and radiation section, and incorporating a thermal conductor with high heat conductivity and surface features to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass substrate is used for the organic light emitting display, then the display achieves good insulation and optical properties, but heat dissipation becomes insufficient leading to reduced light emission efficiency and shortened lifetime
Solution Approach 1:
The cathode is divided into two functional parts: the electrode portion within the encapsulated area and the radiation section extending outside the encapsulated area. This segmentation allows the cathode to simultaneously perform electrical function and thermal radiation function, effectively dissipating heat generated during light emission while maintaining display reliability.
Solution Approach 2:
The cathode is designed to serve multiple functions: it acts as both the electrical electrode for light emission and as a thermal radiation section for heat dissipation. By extending part of the cathode outside the encapsulated area, the same structure performs both electro-optical and thermal management functions, eliminating the need for separate heat dissipation components.
2Temperature
If the cathode is extended outside the encapsulated area to function as a radiation section, then heat radiation efficiency increases, but the device structure becomes more complex
Solution Approach 1:
The cathode structure is designed to perform multiple functions simultaneously - serving as both the electrical electrode for light emission and as the thermal radiation section. This multi-functionality approach increases heat radiation efficiency while avoiding additional structural complexity, as no separate heat dissipation components are introduced.
Solution Approach 2:
The electrode function and radiation section function are merged into a single continuous cathode structure. The cathode extends from within the encapsulated area (electrode portion) to outside the encapsulated area (radiation section), combining electrical and thermal management functions in one integrated component without requiring additional parts or complex assembly.
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 approach increases heat radiation efficiency, maintains light emission efficiency, elongates the display's lifetime, and reduces power consumption while being cost-effective without significant changes to manufacturing processes.
Implementation Method 1
an organic light emitting layer (also referred to as organic multilayer) which emits light when electric fields are applied
Implementation Method 2
a part of a second electrode (cathode) which part is extended to the outside of an encapsulated area... shortens the heat conduction distance and thus promotes thermal diffusion
Data Source
AI summary
An organic light emitting display provided according to the invention maintains light emission efficiency and elongates its lifetime by radiating heat generated from organic light emitting elements to the outside of an encapsulated area. In the organic light emitting display, a part of a cathode is extended to the outside of the encapsulated area of a main substrate to form a radiation section integrally with the cathode. Heat generated from organic light emitting elements is diffused and radiated from the radiation section so that the heat can be discharged therefrom.