OLED Display Device Merging Encapsulation and Color Filter Substrates
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Solution Overview
Problem
Conventional white OLED panels require two substrates, leading to increased thickness and complexity, which hinders the achievement of flexible displays and results in color distortion due to differing lifetimes of primary colors.
Innovation Solution
An OLED display device structure comprising a substrate, an organic light-emitting layer, a first encapsulation layer with alternating inorganic and organic barrier and buffer layers, a color filter layer, and a second encapsulation layer, where the first encapsulation layer functions as a substrate for the color filter, reducing thickness and enabling flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two layers of substrates (TFT substrate and CF substrate) are used in conventional WOLED panels, then colorization can be achieved and lifetime differences of primary colors can be managed, but the thickness of the entire panel increases significantly and flexibility cannot be achieved
Solution Approach 1:
The patent merges the CF substrate function with the TFT substrate by forming the color filter layer directly on the TFT substrate after removing the separate CF substrate. The encapsulation layers serve dual purposes: protecting the OLED structure and providing the substrate for color filter formation, thereby eliminating the need for two separate substrates and achieving flexibility while maintaining colorization capability
Solution Approach 2:
The encapsulation layers are designed to perform multiple functions: they protect the organic light-emitting layer from environmental degradation, serve as a substrate for the color filter layer, and enable flexibility. This multi-functionality eliminates the need for a separate CF substrate, reducing overall panel thickness while maintaining all necessary functions
2Ease of manufacture
If two layers of substrates are used in conventional WOLED panels, then colorization can be achieved, but the structure becomes complicated
Solution Approach 1:
The patent combines the TFT substrate and CF substrate into a single integrated structure. The color filter layer is formed directly on the TFT substrate, eliminating the need for a separate CF substrate. This merging simplifies the overall structure while maintaining the colorization capability through the integrated design
3Length of stationary object
If a separate CF substrate is used, then color filter stability can be ensured, but the overall device thickness increases
Solution Approach 1:
The encapsulation layers are designed to serve as both protective barriers and substrates for the color filter layer. This multi-functional design eliminates the need for a separate CF substrate, reducing panel thickness while ensuring color filter stability through the protective and supportive role of the encapsulation layers
Solution Approach 2:
The encapsulation layers are formed first to create a stable base structure, and then the color filter layer is formed on top of them. This preliminary action ensures that the color filter layer has a stable substrate to adhere to, maintaining color filter stability without requiring a separate CF substrate
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 reduces the overall panel thickness, eliminates the need for a separate color filter substrate, and achieves flexible displays while preventing water and oxygen ingress, thus addressing color distortion issues.
Implementation Method 1
A light emitted by a light-emitting layer of a white OLED is white light
Implementation Method 2
after passing through a Color Filter (CF) to achieve colorization
Implementation Method 3
the first encapsulation layer includes a first barrier layer, and a material of the first barrier layer is an inorganic material
Data Source
AI summary
An OLED display device and a manufacturing method for the same are provided. The OLED display device includes a substrate, an organic light-emitting layer, a first encapsulation layer, a color filter layer, and a second encapsulation layer. Wherein the organic light-emitting layer is disposed on the substrate, the first encapsulation layer covers a surface of the organic light-emitting layer, the color filter layer is disposed on the first encapsulation layer, and the second encapsulation layer covers a surface of the color filter layer. In the present invention, the first encapsulation layer functions as a substrate of the color filter layer and is encapsulated by the first encapsulation layer and the second encapsulation layer, so that the CF substrate is omitted, the thickness of the entire display device is reduced, and flexibility is achieved.