Opaque Frit Sealing Layer for OLED Stability and Light Absorption
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Solution Overview
Problem
Organic electroluminescent devices are prone to damage from ambient humidity and air penetration, leading to instability and the need for additional sealing processes that increase manufacturing time and cost, and require polarizing films to prevent reflective ambient light degradation.
Innovation Solution
An organic electroluminescent device with an opaque frit sealing layer and a color filter layer, separated by a dummy region filled with black matrix material or frit sealing layer, which absorbs ambient light and eliminates the need for a polarizing film, using a laser curing process to form the sealing layer while maintaining a safe distance from the organic electroluminescent pixels array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low-melting sealing glass is used to seal the substrate with the package substrate, then the stability of the organic electroluminescent device is improved by preventing moisture and oxygen penetration, but the manufacturing time and cost increase due to the additional polarizing film process
Solution Approach 1:
The patent combines the sealing function and the ambient light absorption function into a single opaque frit sealing layer. This layer simultaneously seals the organic electroluminescent device to prevent moisture and oxygen penetration, and absorbs ambient light to eliminate the need for a separate polarizing film, thereby reducing manufacturing steps and time
Solution Approach 2:
The opaque frit sealing layer performs multiple functions: it provides hermetic sealing to protect against moisture and oxygen, absorbs reflective ambient light, and eliminates the need for additional polarizing film. This multi-functional design simplifies the overall structure and reduces manufacturing complexity
2Reliability
If a low-melting sealing glass is used to seal the substrate, then the stability is improved, but the device complexity increases due to the additional polarizing film requirement
Solution Approach 1:
The patent merges the sealing layer and light absorption function into a single opaque frit sealing layer, eliminating the need for a separate polarizing film and reducing device structural complexity
Solution Approach 2:
The opaque frit sealing layer serves multiple purposes: hermetic sealing and ambient light absorption. This multi-functionality reduces the number of components needed and simplifies the overall device structure
3Strength
If the low-melting sealing glass is separated with a predetermined distance from the organic electroluminescent pixels array, then the pixels array is protected from heat damage during laser curing, but the manufacturing cost increases due to the additional polarizing film process
Solution Approach 1:
The patent combines the sealing and light absorption functions into one layer, eliminating the polarizing film step and reducing manufacturing cost while maintaining the protective distance during laser curing
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 solution reduces manufacturing time and cost, increases luminous efficiency by eliminating the polarizing film, and enhances the stability of the organic electroluminescent device by preventing moisture and oxygen penetration, while maintaining performance by absorbing ambient light.
Implementation Method 1
the opaque frit sealing layer absorbs ambient light
Implementation Method 2
since the low-melting sealing glass is cured by a laser curing process
Data Source
AI summary
A system for displaying images employing an organic electroluminescent device is provided. The organic electroluminescent device includes a first substrate with an inside surface; an organic electroluminescent pixels array disposed on the inside surface of the first substrate; a second substrate with an inside surface, wherein the inside surface of the second substrate is opposite to the inside surface of the first substrate; a color filter layer disposed on the inside surface of the second substrate; and an opaque frit sealing layer disposed between the first substrate and the second substrate, wherein the opaque frit sealing layer is separated from the organic electroluminescent pixels array by a dummy region and is encapsulating the organic electroluminescent pixel array between the first substrate and second substrate, and wherein the dummy region is filled up with a black matrix material, a frit sealing layer.