OLED Pixel Electrode Side Surface Protection
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Solution Overview
Problem
Organic light emitting devices face issues with light characteristics, such as wavelength and color purity, due to material characteristics and light interference in thin films, which affect the emission of light from each pixel.
Innovation Solution
The device includes a substrate with specific regions for driving transistors, pixel electrodes with a three-layered structure, auxiliary electrodes, and an organic light emitting member, where the pixel electrodes have a metal layer, a transparent conductor layer, and an auxiliary electrode covering the side surfaces, and a common electrode on the organic light emitting member, optimized to improve light path length and interference for desired optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pixel electrodes and organic light emitting members are used, then the device structure is simple, but the wavelength and color purity of emitted light are unsatisfactory
Solution Approach 1:
The pixel electrode is divided into multiple layers: a first electrode layer (metal layer), a second electrode layer (transparent conductor layer), and a third electrode layer (conductive protective member). This segmentation allows each layer to contribute differently to light emission and protection, improving wavelength and color purity while managing structural complexity
Solution Approach 2:
The conductive protective member extends not only on the upper surface but also covers the side surfaces of the pixel electrode. This dimensional extension provides additional functionality for protecting the metal layer during manufacturing processes while maintaining optical performance
2Reliability
If metal layers are exposed during manufacturing, then the electrode structure is simple, but the metal layers are damaged during the manufacturing process
Solution Approach 1:
The conductive protective member is formed to cover the side surfaces of the pixel electrode before subsequent manufacturing steps. This preliminary protective action prevents damage to the metal layer during later processing while maintaining the overall electrode structure
Solution Approach 2:
The conductive protective member acts as an intermediary layer between the metal layer and the manufacturing environment. It provides protection during manufacturing processes while being conductive, thus serving multiple functions without requiring additional separate protective 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
This configuration enhances the optical characteristics of the emitted light, improving wavelength and color purity, and prevents damage to the metal layers during manufacturing, thereby achieving better light emission performance.
Implementation Method 1
an organic light emitting member arranged on the first pixel electrode, the second pixel electrode, and the third pixel electrode
Implementation Method 2
due to the material characteristics of the organic light emitting element or light interference of the thin films through which light passes, the light emitted from each pixel may not satisfy the light characteristic conditions required for an organic light emitting device
Data Source
AI summary
The present invention relates to an organic light emitting device and a manufacturing method thereof. A method of manufacturing an organic light emitting device according to an exemplary embodiment of the present invention includes: respectively forming first, second, and third driving transistors in a first region, a second region, and a third region on a substrate; forming an insulating layer on the first to third driving transistors; respectively forming first, second, and third pixel electrodes on the insulating layer, the first, second, and third pixel electrodes being formed in the first, second, and third regions, respectively; forming an auxiliary electrode on a side surface of each of the first, second, and third pixel electrodes; forming an organic light emitting member on the first to third pixel electrodes; and forming a common electrode on the organic light emitting member.