OLED Microcavity Anode for High Resolution Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current OLED technologies face limitations in achieving high image resolution and color gamut due to the use of Fine Metal Masks (FMM) and the combination of white light with color filters, which restricts the potential of OLEDs in displaying high PPI and full-color images.
Innovation Solution
The solution involves enhancing the anode structure of OLED devices by creating a microcavity effect using a semi-transparent electrode and a reflective structure, with varying cavity lengths for different colors, and employing color filter layers to achieve high luminance and color purity without relying on FMMs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Fine Metal Masks (FMM) and color filters are used to achieve full-color display, then color gamut is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent removes the FMM and color filter components from the OLED structure, extracting only the essential light-emitting organic layers. The color display is achieved through direct emission from differently colored organic light-emitting layers without requiring masks or filters, thereby simplifying manufacturing while maintaining color gamut.
Solution Approach 2:
Instead of using physical masks to define pixel patterns, the patent uses digital addressing and control of individual OLED elements to create the image. The visual information is copied and displayed through direct electroluminescence of organic materials with different emission colors, eliminating the need for physical FMM copying processes.
2Measurement precision
If FMM is used to achieve high PPI display, then image resolution is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the FMM component entirely from the system, achieving high PPI through direct addressing of individual OLED pixels without mask-based patterning. The high resolution is obtained through precise control of organic light-emitting layers and electrodes at the pixel level, eliminating the manufacturing complexities of FMM alignment and patterning.
Solution Approach 2:
The patent replaces the mechanical FMM patterning system with an electrical and optical control system. Image formation is achieved through electrical addressing of pixels and optical emission from organic materials rather than mechanical mask positioning, thereby achieving high PPI with reduced manufacturing difficulty.
3Illumination intensity
If white light with color filters is used, then full-color display is achieved, but luminous efficiency decreases
Solution Approach 1:
The patent employs organic light-emitting layers with different molecular structures that directly emit different colors (red, green, blue) through electroluminescence. Each organic layer is designed to emit its characteristic color without requiring white light generation and subsequent color filtering, thereby eliminating energy loss and improving luminous efficiency while achieving full-color display.
Solution Approach 2:
The patent converts the previously harmful approach of using broad-spectrum white light that requires filtering into a beneficial direct-color emission approach. By designing organic materials to emit specific colors directly, the energy that would have been wasted in filtering is now used productively for light emission, turning the limitation of color filter systems into an advantage of direct electroluminescence.
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 allows for the attainment of high resolution and enhanced color gamut, enabling the production of OLED devices with improved luminous efficiency and color accuracy, suitable for large-sized displays without the need for FMMs.
Implementation Method 1
the first electrode includes a reflecting layer, a transparent insulating layer and a transparent contact layer sequentially disposed on the substrate
Implementation Method 2
such that a cavity is formed between the second electrode and the reflecting layer
Implementation Method 3
enhancing the anode structure of OLED devices by creating a microcavity effect using a semi-transparent electrode and a reflective structure, with varying cavity lengths for different colors
Data Source
AI summary
The present disclosure provides a light-emitting device, a pixel unit, a method for manufacturing the pixel unit, and a display device. The light-emitting device comprises a first electrode, an organic light-emitting layer and a second electrode which are sequentially disposed on a substrate; the first electrode comprises a reflecting layer, a transparent insulating layer and a transparent contact layer which are sequentially disposed on the substrate; and the second electrode is a semi-transparent electrode, so that a cavity is formed between the second electrode and the reflecting layer.