OLED Cap Metal Coating Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting diode (OLED) displays face degradation due to heat generated during operation, which is not effectively dissipated by the glass cap used in current designs, leading to reduced lifespan.
Innovation Solution
A cap with a metal coating layer is applied to the glass, forming an internal air layer to enhance heat dissipation, while a getter absorbs moisture and gases, and the cap's design minimizes thermal expansion coefficient differences with the transparent substrate to maintain adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass cap is used to enclose the OLED device, then the OLED is protected from gas and moisture, but heat dissipation is insufficient leading to device degradation
Solution Approach 1:
The cap is constructed as a composite structure combining glass substrate with metal coating layers (silver, aluminum, or titanium). The glass provides protection from gas and moisture, while the metal layers provide thermal conduction for effective heat dissipation. This composite material approach resolves the contradiction by integrating the protective function of glass with the thermal management function of metal.
2Temperature
If a metal coating layer is added to the glass cap to improve heat dissipation, then heat dissipation is enhanced, but the adhesion between cap and substrate may be compromised due to thermal expansion differences
Solution Approach 1:
The invention carefully selects metal materials with thermal expansion coefficients that match or are close to glass (silver: 19.5×10^-6/K, aluminum: 23.1×10^-6/K, titanium: 8.6×10^-6/K versus glass: 8.5-9.5×10^-6/K). This parameter matching minimizes thermal stress during temperature changes, preventing adhesion failure while maintaining effective heat dissipation through the metal layers.
3Illumination intensity
If the OLED operates at high brightness to improve display quality, then luminous efficiency increases, but heat generation increases causing device degradation
Solution Approach 1:
The invention converts the harmful heat generated during high-brightness operation into a manageable thermal flow by implementing an active heat dissipation system. The metal-coated cap acts as a heat sink that conducts away the heat generated during high-luminance operation, allowing the device to maintain high brightness levels without suffering from heat-induced degradation.
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
Effectively radiates heat generated at the OLED device, reducing degradation and maintaining the adhesion between the cap and substrate, thus extending the OLED's lifespan and performance.
Implementation Method 1
the cap includes a glass and a metal coating layer which is coated at the glass... the cap with a metal coating layer is applied to the glass, forming an internal air layer to enhance heat dissipation
Implementation Method 2
A cap with a metal coating layer is applied to the glass, forming an internal air layer to enhance heat dissipation
Implementation Method 3
a getter absorbs moisture and gases
Data Source
AI summary
An organic light emitting diode display for effectively emitting a heat which is generated at an organic light emitting diode device is disclosed. In the organic light emitting diode display, an organic light emitting diode device is formed at a front surface of a transparent substrate to radiate a light via the transparent substrate. And a cap is formed to enclose the organic light emitting diode device with having an internal air layer therebetween, and wherein the cap includes a glass and a metal coating layer which is coated at a bonding surface of the glass, and the bonding surface is attached to the transparent substrate.