OLED Optical Film Lamination for Thinner Flexible Displays
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Solution Overview
Problem
Existing OLED display devices face issues with fussy and costly film application processes, especially for flexible or large-sized devices, which increase thickness and make rolling up difficult, and require effective water-oxygen resistance to prevent damage from ambient vapor and oxygen.
Innovation Solution
An optical film lamination is used as the packaging cover plate or base substrate, comprising a supporting substrate with a circular polarizer film, water-oxygen resistant film, and color resistant film, providing antireflection, water-oxygen resistance, and full-color display functions, potentially omitting the need for additional planarization layers and simplifying the structure for thinner and lighter OLED devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate films (water-oxygen resistant film, circular polarizer, color resistant layer) are applied in sequence, then protection and display functions are achieved, but the process becomes fussy and costly
Solution Approach 1:
The patent combines multiple separate films (water-oxygen resistant film, circular polarizer, and color resistant layer) into a single integrated optical film lamination. This merging eliminates the need for sequential application of multiple films, simplifying the packaging process while maintaining all required functions including water-oxygen resistance, polarization, and color filtering.
Solution Approach 2:
The optical film lamination serves multiple functions simultaneously: it provides water-oxygen resistance for protection, circular polarization for display quality, and color filtering for full-color display. This multi-functional integration resolves the contradiction by achieving comprehensive protection and display performance through a single component rather than multiple separate films.
2Reliability
If multiple films are applied in sequence, then protection and display functions are achieved, but device thickness increases and flexibility decreases
Solution Approach 1:
The patent merges multiple thick separate films into a single integrated optical film lamination, significantly reducing the cumulative thickness. The integrated structure provides the same protective and optical functions as multiple separate films but with reduced overall thickness, thereby improving flexibility and enabling the device to be rolled up.
Solution Approach 2:
The optical film lamination is designed as a thin, flexible integrated film that provides comprehensive protection and optical functions. This thin-film approach replaces thicker separate films, reducing overall device thickness while maintaining flexibility and water-oxygen resistance, enabling the OLED display device to be flexible and rollable.
3Reliability
If separate films are applied for water-oxygen resistance and display functions, then protection is achieved, but additional planarization layers are required
Solution Approach 1:
The optical film lamination is designed to provide both protective functions (water-oxygen resistance) and optical functions (circular polarization, color filtering) simultaneously. By integrating these functions into a single multi-functional layer, the patent eliminates the need for additional separate planarization layers that would be required if separate films were used, thereby reducing the total number of layers.
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 optical film lamination addresses the problems of fussy processes and high costs associated with film application, reduces device thickness, and enhances display quality by providing effective water-oxygen resistance and antireflection, making OLED devices lighter, thinner, and easier to roll up while maintaining full-color functionality.
Implementation Method 1
a circular polarizer needs to be applied after applying the water-oxygen resistant film, in order to inhibit a decrease of the display contrast and visibility due to the reflection of the ambient light
Implementation Method 2
both the organic material of the light-emitting layer and the active metal of the cathode are extremely sensitive to aqueous vapor and oxygen, thus the OLED display device requires the technical support of a packaging technique more excellent than other display devices
Implementation Method 3
The light emission of the OLED display device is realized by the light emission of an organic material in the light-emitting layer excited when the electrons in the cathode and the holes in the anode combine in the light-emitting layer
Data Source
AI summary
The present invention discloses an organic electroluminescent display device and a display apparatus, wherein the organic electroluminescent display device employs an optical film lamination as a base substrate or a packaging cover plate, the optical film lamination includes a circular polarizer film, a water-oxygen resistant film and a color resistant film that are located on a supporting substrate, thus it has an antireflection function, a good water-oxygen resistance as well as a full-color display function, so that not only the problem of fussy process and high cost of an OLED display device caused by film application can be solved, but also the problem that the thickness of a flexible OLED display device is increased and thus the device is difficult to be rolled up due to film application is avoided; also, the OLED display device has the advantages of being lighter and thinner and having a better display effect, etc.