Display Panel Heat Dissipation Layers for Light Extraction
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Solution Overview
Problem
The light-emitting efficiency of display panels decreases with increasing operating temperature, as external quantum efficiency is reduced, necessitating a method to lower the temperature of the light-emitting elements during operation.
Innovation Solution
A display panel design incorporating a drive element, a first heat dissipation layer with a higher refractive index than a second heat dissipation layer, both made of materials like Al2O3 or TiO2 with high thermal conductivity, strategically positioned to dissipate heat generated by the light-emitting element, thereby maintaining optimal refractive index matching and thermal conductivity for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the operating temperature of the light-emitting element is increased, then the device can operate continuously, but the external quantum efficiency and light-emitting efficiency are reduced
Solution Approach 1:
The heat dissipation structure is divided into multiple layers with different refractive indices. The first heat dissipation layer has a higher refractive index than the second heat dissipation layer, creating a gradient structure that optimizes both heat dissipation and light extraction efficiency across different depths of the device
Solution Approach 2:
Different regions of the heat dissipation structure have different refractive indices tailored to their specific functions. The first heat dissipation layer closer to the light-emitting element has higher refractive index for effective heat extraction, while the second layer has lower refractive index to minimize impact on light output
2Loss of energy
If heat dissipation structures are added to lower operating temperature, then light-emitting efficiency is improved, but device complexity increases
Solution Approach 1:
The heat dissipation layers serve dual functions: they extract heat from the light-emitting element to maintain efficiency, and their specific refractive index configuration also enhances light extraction efficiency by reducing total internal reflection at the interfaces
Solution Approach 2:
The patent uses composite heat dissipation structures with different materials or compositions having distinct refractive indices. This composite approach allows simultaneous optimization of thermal conductivity and optical properties without requiring separate independent structures
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
This configuration effectively reduces the operating temperature of the light-emitting element, enhancing its external quantum efficiency and overall light-emitting efficiency, while also increasing light output intensity.
Implementation Method 1
a coefficient of thermal conductivity of the first heat dissipation layer and a coefficient of thermal conductivity of the second heat dissipation layer are greater than one
Implementation Method 2
A refractive index of the first heat dissipation layer is greater than a refractive index of the second heat dissipation layer when a light-emitting surface of the light-emitting element faces the first heat dissipation layer
Data Source
AI summary
A display panel includes a drive element, a first heat dissipation layer, a light-emitting element, and a second heat dissipation layer. The drive element is disposed on a substrate. The first heat dissipation layer is disposed on the drive element. The light-emitting element is disposed on the first heat dissipation layer and electrically connected to the drive element. The second heat dissipation layer covers the light-emitting element. A refractive index of the first heat dissipation layer is greater than a refractive index of the second heat dissipation layer when a light-emitting surface of the light-emitting element faces the first heat dissipation layer, and the refractive index of the second heat dissipation layer is greater than the refractive index of the first heat dissipation layer when the light-emitting surface of the light-emitting element faces the second heat dissipation layer.