Display Substrate Heat-Radiation Layer for OLED Lifespan
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Solution Overview
Problem
Light emitting display devices face challenges in efficiently dissipating heat due to the degradation of organic materials used in the emission layer, which can reduce their lifespan, necessitating improved heat radiation performance.
Innovation Solution
Incorporation of a heat radiation layer with polymer resin and heat radiation particles, such as copper, carbon nanotubes, graphene oxide, and graphite, within the display device substrate to enhance heat dissipation, utilizing a configuration that includes first and second portions connected or positioned in holes or grooves for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic material is used in the emission layer of LED, then light emission function is achieved, but heat degradation occurs reducing lifespan
Solution Approach 1:
The patent extracts the heat radiation function from the substrate structure by creating holes and filling them with heat radiation layers containing high thermal conductivity particles. This separates the light emission function (organic emission layer) from the heat management function, allowing the organic material to emit light while the dedicated heat radiation pathway prevents heat accumulation that would degrade the material and reduce lifespan.
Solution Approach 2:
The patent uses composite materials in the heat radiation layer by combining polymer resin with heat radiation particles having high thermal conductivity (copper, aluminum, silver, carbon nanotubes, graphene, or graphite). This composite structure provides both the structural integrity of the polymer and the superior heat conduction of the metallic or carbon-based particles, effectively managing heat while protecting the organic emission layer.
2Temperature
If heat radiation layer is added to substrate, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent segments the heat radiation layer into two distinct portions: a first portion filling the holes in the substrate that provides direct thermal contact with the emission layer, and a second portion on the substrate surface that facilitates heat dissipation to the environment. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural simplicity through the integrated hole-filling approach.
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 solution effectively enhances heat radiation performance, preventing transistor damage and improving the device's lifespan by efficiently discharging heat generated by the light-emitting device layer.
Implementation Method 1
a heat radiation layer disposed on another side of the substrate. The heat radiation layer contacts the metal layer in the hole
Implementation Method 2
The heat radiation layer may include a polymer resin and heat radiation particles. The heat radiation particles may be at least one of copper, carbon nanotubes (CNT), graphene oxide (GO), and graphite
Data Source
AI summary
A display device according to an embodiment includes a substrate including a plurality of holes including a hole, a metal layer disposed on one side of the substrate, a light-emitting device layer disposed on the metal layer, and a heat radiation layer disposed on another side of the substrate. The heat radiation layer contacts the metal layer in the hole.