Flexible Display Heat Dissipation via Segmented Graphite-Copper Layer
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Solution Overview
Problem
Flexible OLEDs face degradation in brightness due to heat generated by batteries and IC chips, which also affects their bending durability, as existing heat dissipation methods compromise their ability to deform without damage.
Innovation Solution
A flexible display device with a heat dissipating layer comprising a first sublayer of graphite or nanocarbon and a second sublayer of copper, strategically positioned on non-bending regions of the panel, along with a buffer and metal layer, to enhance heat dissipation and bending durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat dissipating layer is adopted to help dissipating the heat, then the heat dissipation performance is improved, but the bending durability of the FOLEDs decreases
Solution Approach 1:
The heat dissipating layer is divided into a first heat dissipating sublayer and a second heat dissipating sublayer with different materials and functions. The first sublayer (graphite or nanocarbon) provides thermal conduction, while the second sublayer (copper) provides enhanced heat dissipation. This segmentation allows each layer to be optimized for its specific function while working together to solve the heat dissipation-bending durability contradiction.
Solution Approach 2:
The patent uses composite materials in the heat dissipating layer by combining graphite or nanocarbon with copper. This composite structure leverages the high thermal conductivity of graphite/nanocarbon and the excellent heat dissipation properties of copper, achieving superior heat management while maintaining flexibility and bending durability.
2Ease of manufacture
If organic materials with low glass transition temperatures are used to manufacture organic films, then the ease of manufacture is improved, but the brightness stability degrades due to temperature transformation into crystalline forms
Solution Approach 1:
The patent changes the thermal management parameters by introducing a multi-layer heat dissipating structure with specific thermal conductivity characteristics. This parameter change ensures that the operating temperature remains below the glass transition temperature of the organic materials, preventing crystalline transformation and maintaining brightness stability while allowing the use of easily manufacturable organic films.
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 significantly improves heat dissipation and bending durability by managing stress and temperature distribution, reducing the flexible display device's maximum temperature from 78°C to 42.402°C, thereby maintaining performance and flexibility.
Implementation Method 1
the heat dissipating layer including a first heat dissipating sublayer and a second heat dissipating sublayer... the material of the first heat dissipating sublayer is graphite or nanocarbon... the material of the second heat dissipating sublayer is copper
Data Source
AI summary
A flexible display device includes a flexible display panel and a heat dissipating layer. The flexible display panel includes a bending region and a non-bending region. The heat dissipating layer includes a first heat dissipating sublayer and a second heat dissipating sublayer. The first heat dissipating sublayer is disposed on the non-bending region and the second heat dissipating sublayer is disposed on the first heat dissipating sublayer.