Flexible Display Heat Sink Layer with Metal Alloy for Thermal Management
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Solution Overview
Problem
Flexible display devices face challenges in maintaining flexibility and effective heat radiation due to the low thermal conductivity of traditional support materials, leading to issues like mura and impact resistance defects.
Innovation Solution
A display device incorporating a heat sink layer with a metal alloy having thermal conductivity between 150 W/mK and 340 W/mK, and an elastic modulus between 100 GPa and 140 GPa, along with specific weight percentages of elements like iron, phosphorus, zinc, nickel, and silicon, to enhance both thermal management and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a SUS plate is disposed on a lower portion of the flexible display device to improve impact resistance, then impact resistance is improved, but thermal conductivity deteriorates leading to poor heat radiation
Solution Approach 1:
The patent employs a composite structure consisting of a SUS plate layer and a graphite heat sink layer disposed in sequence on the lower portion of the flexible display device. The SUS plate provides impact resistance while the graphite layer with high thermal conductivity (≥150 W/mK) conducts heat away from the display panel, resolving the contradiction between mechanical strength and thermal management through material composition.
Solution Approach 2:
The lower portion structure is designed to perform multiple functions simultaneously: the SUS plate provides impact resistance and structural support, while the graphite heat sink layer provides thermal conduction and heat radiation. This multi-functional design allows a single structural component to address both mechanical protection and thermal management requirements.
2Reliability
If a heat sink layer including graphite is disposed on a lower side of the SUS plate to prevent deterioration of heat radiation, then heat radiation is improved, but flexibility deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for the graphite heat sink layer: thermal conductivity of 150 W/mK or higher and elastic modulus of 140 GPa or lower. By controlling these physical parameters, the invention achieves optimal balance between heat radiation performance and flexibility, ensuring the heat sink layer conducts heat effectively while maintaining the flexible characteristics necessary for flexible display devices.
Solution Approach 2:
The graphite heat sink layer is positioned specifically on the lower side of the SUS plate where heat accumulation occurs, providing localized thermal management. This targeted placement ensures that heat radiation enhancement is achieved at the critical location without compromising the overall flexibility of the flexible display device structure.
3Ease of manufacture
If traditional support materials with low thermal conductivity are used, then manufacturing simplicity is maintained, but heat radiation is insufficient leading to display defects
Solution Approach 1:
The patent introduces a composite lower portion structure combining SUS plate and graphite heat sink layer, which can be integrated into the existing manufacturing process. This composite design enhances heat radiation capability to prevent display defects such as mura and staining while maintaining compatibility with conventional flexible display device manufacturing techniques.
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 improves heat radiation and maintains flexibility, reducing the generation of defects such as mura and enhancing impact resistance, as demonstrated in exemplary embodiments.
Implementation Method 1
a heat sink layer provided below the support plate, wherein the heat sink layer includes a metal alloy having thermal conductivity that is equal to or greater than 150 W/mK
Data Source
AI summary
A display device according to an exemplary embodiment includes: a display panel for displaying an image; a support plate provided on one side of the display panel; and a heat sink layer provided below the support plate, wherein the heat sink layer includes a metal alloy having thermal conductivity that is equal to or greater than 150 W/mK and equal to or less than 340 W/mK, and an elastic modulus that is equal to or greater than 100 GPa and equal to or less than 140 GPa.