OLED Micro-Cavity Optical Path Controller for Light Interference
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Solution Overview
Problem
Organic light emitting displays (OLEDs) face issues with total reflection and light interference between thin films, which deteriorate optical characteristics such as luminance and color reproducibility.
Innovation Solution
The implementation of a micro-cavity structure in OLEDs, including an insulating substrate with specific pixel electrode configurations, auxiliary electrodes, an optical path controller, and a common electrode, along with a manufacturing method that forms these components to control optical paths and enhance light interference for improved optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple thin films are stacked in OLED structure, then device functionality is achieved, but total reflection and light interference occur deteriorating optical characteristics
Solution Approach 1:
A micro-cavity structure is introduced as an intermediary element between the thin films in the OLED stack. This micro-cavity acts as a mediator that controls the optical path of light passing through the multiple thin films, preventing harmful total reflection and interference effects while maintaining the necessary device functionality of the multi-layer structure.
Solution Approach 2:
The optical characteristics of the OLED are improved by changing the physical parameters of the light path control. The micro-cavity structure modifies the optical path length and light propagation parameters, transforming the harmful interference patterns into constructive interference that enhances luminance and color reproducibility without compromising device functionality.
2Ease of manufacture
If conventional OLED structure is used, then manufacturing is simplified, but optical efficiency is poor due to light interference
Solution Approach 1:
The micro-cavity structure serves as an intermediary component that can be integrated into the conventional OLED manufacturing process. It is positioned between existing thin films and controls light propagation, improving optical efficiency by reducing energy loss from interference while maintaining compatibility with standard manufacturing techniques.
3Illumination intensity
If micro-cavity structure is added to control optical path, then optical characteristics improve, but device complexity increases
Solution Approach 1:
Rather than modifying the entire OLED structure, the micro-cavity configuration is applied locally at specific positions within the thin film stack. This localized approach controls the optical path where it is most needed to improve luminance and color reproducibility, minimizing the increase in overall device complexity while achieving the desired optical characteristics.
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 approach enhances optical characteristics by controlling light interference, resulting in improved luminance and color reproducibility in OLEDs.
Implementation Method 1
total reflection or light interference is generated between thin films of the OLED, thereby deteriorating optical characteristics
Implementation Method 2
total reflection or light interference is generated between thin films of the OLED
Data Source
AI summary
An organic light emitting display according to an exemplary embodiment of the present invention includes a transistor arranged on an insulating substrate, a pixel electrode connected to the transistor and including a reflective film, an optical path controller arranged on the pixel electrode, an auxiliary electrode arranged on the pixel electrode and the optical path controller, an organic light emitting member arranged on the organic light emitting member, and a common electrode arranged on the organic light emitting member, wherein the optical path controller has a lower light absorption coefficient than the auxiliary electrode.