Thermally Conductive Layer for OLED Thermal Gradient Reduction
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices experience uneven degradation due to thermal gradient regions caused by the operation of electronic components, leading to non-uniform visual artifacts and accelerated luminance degradation.
Innovation Solution
A thermally conductive layer is disposed adjacent to the OLED display panel to facilitate heat transfer from high temperature regions to low temperature regions, using materials with high thermal conductivity such as copper, graphite, graphene, carbon nanotubes, aluminum, gold, and silver to distribute heat uniformly across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic components are positioned near the OLED display, then device functionality is improved, but temperature gradients increase causing uneven OLED degradation
Solution Approach 1:
A thermally conductive layer is introduced as an intermediary between the OLED display and electronic components. This layer acts as a heat redistribution medium, conducting heat away from high-temperature regions near electronic components and distributing it to lower-temperature regions, thereby preventing localized thermal damage while maintaining close proximity of functional components.
2Illumination intensity
If OLEDs are driven harder to increase luminance, then brightness output is improved, but degradation rate increases due to heat generation
Solution Approach 1:
The heat generated by hard-driving OLEDs to increase luminance is converted from a harmful factor into a beneficial one. The thermally conductive layer captures this excess heat and redistributes it to cooler regions of the display, thereby utilizing the generated thermal energy to maintain overall thermal balance and prevent localized degradation that would otherwise result from concentrated heat.
3Temperature
If a thermally conductive layer is added to spread heat, then temperature uniformity is improved, but device complexity increases
Solution Approach 1:
The thermally conductive layer is designed to be uniform in composition and properties across the display area, creating homogeneous thermal conduction throughout the structure. This uniform approach simplifies the overall design compared to localized cooling solutions, as a single material layer provides comprehensive thermal management across the entire display surface.
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 thermally conductive layer effectively spreads heat, reducing temperature gradients and preventing uneven degradation of OLEDs, thereby minimizing the occurrence of white spots and image burn-in.
Implementation Method 1
The thermally conductive layer facilitates heat transfer from high temperature to low temperature regions of the OLED display panel
Data Source
AI summary
Techniques are provided for removing thermal gradients from an organic light emitting diode (OLED) display. In one embodiment, an OLED display device includes a thermally conductive layer placed between electronic components housed within the device and the OLED display. Heat given off by the electronic components is transferred from warm to cold regions of the thermally conductive layer to create a more uniform ambient temperature across the back of the OLED display. Some embodiments indicate a position of the thermally conductive layer within layers of an OLED display stack (e.g., between a glass substrate and polyimide layer). Some embodiments include a specific range of thermal conductivities and/or thicknesses desired for the thermally conductive layer.