Integrated Peltier OLED Display Cooling for Heat Degradation
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Solution Overview
Problem
Existing OLED and QLED display devices suffer from reduced lifetime due to heat-induced degradation, with external Peltier elements leading to inefficient heat transfer, increased thickness, and higher manufacturing costs.
Innovation Solution
A display device design incorporating a light-emitting element with a first electrode, a second electrode, a light-emitting layer, and a first function layer, along with a first cooling element featuring an extending portion of the second electrode and a function layer that overlaps and is in contact with a third electrode, utilizing the Peltier effect for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an external Peltier element is provided on the opposite side of the substrate or sealing layer, then the OLED can be cooled, but the heat transfer efficiency is poor and the degradation of the OLED due to heat cannot be efficiently suppressed
Solution Approach 1:
The cooling element is merged with the light-emitting element structure by forming the cooling element electrode and function layer extending portions within the same device stack, eliminating the need for separate external cooling components and improving thermal coupling efficiency
Solution Approach 2:
The function layer extending portion acts as an intermediary thermal conduction path between the cooling element electrode and the light-emitting layer, enabling efficient heat transfer from the light-emitting element to the cooling element through direct contact
2Temperature
If an external Peltier element is provided on the opposite side of the substrate or sealing layer, then the OLED can be cooled, but the thickness of the display device is caused to be increased
Solution Approach 1:
The cooling element is nested within the existing display device structure by integrating it with the light-emitting element, where the cooling element electrode and function layer extending portions are formed within the same vertical stack, eliminating the need for additional external cooling components that would increase device thickness
3Temperature
If an external Peltier element is provided on the opposite side of the substrate or sealing layer, then the OLED can be cooled, but manufacturing costs of the display device are increased
Solution Approach 1:
The cooling element manufacturing process is merged with the existing light-emitting element fabrication process, allowing both components to be formed in the same manufacturing steps using the same equipment and materials, thereby eliminating the need for separate cooling element assembly and reducing overall manufacturing costs
Solution Approach 2:
The function layer extending portion serves multiple functions: it acts as a thermal conduction path for the cooling element, maintains structural integrity of the device stack, and provides electrical isolation between the cooling element electrode and the light-emitting element electrode, reducing the need for additional specialized components
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 suppresses heat-induced degradation, reduces device thickness, and lowers manufacturing costs by integrating the cooling element within the display device structure.
Implementation Method 1
a first cooling element including a third electrode, an extending portion of the second electrode, the extending portion at least partially overlapping the third electrode, and an extending portion of the first function layer, the extending portion overlapping the extending portion of the second electrode and being in contact with the extending portion of the second electrode and with the third electrode
Data Source
AI summary
A display device includes a light-emitting element that includes a first electrode, an second electrode, a light-emitting layer provided between the first electrode and the second electrode, a first function layer provided between the light-emitting layer and the second electrode and in contact with the second electrode, and a first cooling element that includes a third electrode. An extending portion of the second electrode at least partially overlaps the third electrode, and an extending portion of the first function layer overlaps the extending portion of the second electrode and is in contact with the extending portion of the second electrode and the third electrode.