OLED Stack Integrating Encapsulation and Color Conversion
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Solution Overview
Problem
Large-sized OLED devices using thin-film encapsulation technology with color filter or color conversion methods have insufficient aperture ratios, limiting their performance and efficiency.
Innovation Solution
An OLED device structure featuring a stack of alternately arranged inorganic and organic layers, with at least one organic layer serving as a color conversion layer, is used to enhance encapsulation and increase aperture ratio, while simplifying manufacturing and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin-film encapsulation technology with color filter or color conversion methods is used in large-sized OLED devices, then encapsulation is achieved, but aperture ratio becomes insufficient
Solution Approach 1:
The patent combines encapsulation function and color conversion function into a single integrated layer structure. The organic layers serve dual purposes: providing encapsulation protection and performing color conversion through fluorescent or phosphorescent materials, thereby eliminating the need for separate color filter layers and improving aperture ratio while maintaining encapsulation reliability
Solution Approach 2:
The organic layers in the OLED device are designed to perform multiple functions simultaneously: encapsulation, color conversion, and light emission. This multi-functionality reduces the total number of layers required, increases the aperture ratio, and maintains the protective encapsulation function needed for device reliability
2Adaptability or versatility
If traditional color filter method or color conversion method is used with thin-film encapsulation, then full-color display is achieved, but device thickness increases
Solution Approach 1:
The patent merges the encapsulation layers and color conversion layers into a single integrated structure. The organic encapsulation layers contain fluorescent or phosphorescent materials that perform color conversion directly within the encapsulation structure, eliminating the need for additional color filter layers and reducing overall device thickness while maintaining full-color display capability
3Reliability
If separate encapsulation and color conversion layers are used, then encapsulation and color conversion functions are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent combines encapsulation and color conversion into a single layer formation process. The organic layers are deposited with embedded fluorescent or phosphorescent materials, allowing both encapsulation and color conversion functions to be achieved in one manufacturing step, thereby reducing process complexity while maintaining device reliability
Solution Approach 2:
The organic layers are designed to perform multiple functions including encapsulation, color conversion, and light emission. This multi-functionality simplifies the manufacturing process by reducing the number of separate layers and deposition steps required, while still achieving the necessary encapsulation protection and full-color display capability
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 increases the aperture ratio, makes the device thinner, simplifies the production process, and reduces manufacturing costs, resulting in a more compact and efficient OLED display.
Implementation Method 1
One organic layer of the at least one organic layer includes a color conversion layer
Data Source
AI summary
The present disclosure relates to an OLED device and a manufacturing method thereof, a display panel and a display device. The OLED device includes: a first electrode disposed on a substrate; an organic light emitting layer disposed on the first electrode; a second electrode disposed on the organic light emitting layer; and a stack of layers disposed on the second electrode. The stack of layers includes at least one inorganic layer and at least one organic layer. The at least one inorganic layer and at least one organic layer are alternately arranged. One organic layer of the at least one organic layer includes a color conversion layer.