OLED Display Asymmetric Emission Layers for White Light Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting diode (OLED) displays face challenges in minimizing interference between organic emission layers, leading to reduced white light emitting efficiency and lifespan due to differences in emission layer characteristics and interactions.
Innovation Solution
The OLED display features a stack of organic emission layers with different surface areas, each emitting light of varying wavelengths, and a color filter to minimize interference, with the layers being sequentially formed using different angles and materials to optimize light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If overlapping emission layers with the same areas are used to realize full color, then color display capability is improved, but white light emitting lifespan is reduced due to strong interaction between different emission layers
Solution Approach 1:
The patent applies asymmetry by making the emission layers have different areas rather than the same area. Specifically, the first emission layer has a larger area than the second emission layer, creating an asymmetric structure that reduces the interaction strength between layers while maintaining color display capability through the color filter.
2Productivity
If different sized pixels are formed to address emission efficiency differences, then emission efficiency is improved, but design and driving complexity increases with low response time
Solution Approach 1:
The patent applies local quality by creating different areas for different emission layers within the same pixel structure. The first emission layer has a larger area than the second emission layer, allowing each layer to contribute optimally to the overall emission efficiency without requiring different pixel sizes or increased design complexity.
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 the white light emitting efficiency and lifespan by compensating for efficiency differences between emission layers, resulting in improved color accuracy and display performance.
Implementation Method 1
organic emission layers, which are placed between an anode providing holes and a cathode providing electrons, generate excitons by hole-electron coupling
Implementation Method 2
The excitons emit light because of the energy released by the coupling (otherwise known as de-excitation)
Implementation Method 3
The OLED display operates on the principle that organic emission layers... generate excitons by hole-electron coupling. The excitons emit light because of the energy released by the coupling
Implementation Method 4
a color filter layer which passes the light emitted from the plurality of organic emission layers
Data Source
AI summary
An OLED display for improving white light emitting efficiency and simplifying a manufacturing process includes a plurality of pixels, each of the pixels having a transistor unit, a color filter unit and an organic light emitting device unit. The transistor unit converts signals from the outside into driving signals for driving an organic light emitting device unit. The organic light emitting device unit is composed of blue, red and green emission layers each having different areas. By passing white light through a color filer, the OLED display can realize full color.