Thermal Insulation Layer Layout for High-Temperature OLED Displays
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Solution Overview
Problem
Display devices with heat dissipating layers fail to function properly in high temperature environments, leading to degradation of light-emitting elements, particularly in in-vehicle applications.
Innovation Solution
Incorporating a thermal insulation layer made from a resin containing a metal complex compound with an ammonium salt ligand, such as (NH4)2[MoS4], dispersed in a polyimide resin, to insulate light-emitting elements from external heat, thereby preventing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat dissipating layer is provided on the surface of the support substrate, then heat dissipation is improved, but the light-emitting elements still deteriorate in high temperature environments
Solution Approach 1:
A thermal insulation layer is introduced as an intermediary between the support substrate and the light-emitting elements. This layer blocks external heat from reaching the light-emitting elements, protecting them from thermal degradation while allowing the heat dissipating layer to manage heat generated by the elements themselves.
Solution Approach 2:
The thermal insulation layer is constructed from composite materials including a resin matrix and dispersed inorganic particles (such as aluminum oxide, aluminum nitride, or boron nitride). This composite structure provides both mechanical integrity and superior thermal insulation properties to protect the light-emitting elements from external heat.
2Adaptability or versatility
If the display device is used in high temperature environments, then operational versatility is improved, but light-emitting element degradation accelerates
Solution Approach 1:
The thermal insulation layer is provided in advance before the light-emitting elements are exposed to external heat in high temperature environments. This preliminary protective measure prevents heat from reaching the light-emitting elements, enabling the display device to operate reliably in high temperature environments such as in-vehicle applications.
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 thermal insulation layer effectively retards the degradation of light-emitting elements by providing adequate heat insulation, extending the time for luminance to decrease to 90% relative to initial luminance at 70°C, compared to configurations without this layer.
Implementation Method 1
at least one thermal insulation layer that thermally insulates the light-emitting elements from external heat is provided
Data Source
AI summary
Provided is a display device that can retard the degradation of light-emitting elements even when the display device is used in a high temperature environment. A display device includes a TFT layer, a light-emitting element layer provided with a plurality of light-emitting elements, a heat dissipating layer, an extraction member, and a thermal insulation layer that insulates the light-emitting elements from external heat. The thermal insulation layer is made from a material containing a first resin in which a metal complex compound having an ammonium salt as a ligand is dispersed. The TFT layer is formed between the heat dissipating layer and the light-emitting element layer. The heat dissipating layer overlaps the light-emitting elements. The thermal insulation layer surrounds the heat dissipating layer. The extraction member is formed to overlap the thermal insulation layer. The heat dissipating layer and the thermal insulation layer are in direct contact with the TFT layer.