Technology
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Thermal Issue
Heat Issues in Electronic Devices
[Mobile/Laptop]
Heat generated from IC components such as DDI* (Display Driver IC), PMIC* (Power Management IC), and AP (Application Processor).
[TV Products]
Heat caused by high current in the panel itself.
Despite the many advantages of OLED displays, the heat generated by the panel itself, which accelerates the degradation of the luminescent materials within the pixels, and the heat from surrounding circuit components can directly transfer to the user’s skin, potentially causing low-temperature burns.
Direct Heat Transfer to the User’s Skin→
Can cause low-temperature burns.
In 2022, there was a significant issue related to heat dissipation in smartphone display modules due to the GOS (Game Optimization Service), a function for controlling heat during mobile gaming on Samsung devices.
Multi-layer
Module
Limitations of layered module materials
Layer Structure with Multiple Functions
In the case of mobile devices, within the thin and limited design of smartphones, materials that consider the following electrical properties are absolutely necessary for circuit components such as the Application Processor (AP) and Display Driver IC (DDI):
- Heat dissipation,
- Reflection/light blocking,
- Absorption of external shocks,
- EMI/ESD shielding (electromagnetic interference/electrostatic discharge).
Graphite vs.
Metal
Horizontal Heat Diffusion and Reflection Characteristics of Graphite
Graphite
Graphite has high thermal conductivity within its planar structure and primarily conducts heat well in the horizontal direction. However, the thermal conductivity between layers is relatively low. Graphite is also stable at high temperatures, making it useful for heat management in high-temperature environments due to its excellent thermal conductivity.
Metal
Metal has overall high thermal conductivity and rapidly transfers heat thanks to free electrons. It demonstrates excellent thermal conductivity regardless of direction
- Horizontal Diffusion Characteristics : Large-area displays benefit greatly from the heat diffusion effect.
- Black color : Excellent reflection and light-blocking properties.
- Mixed resin : Provides advantageous characteristics for shock and vibration reliability.
- High thermal conductivity metal (240 W/m·K) : Exhibits excellent radiation properties.
- Good EMI shielding performance
