Organic Light Emitting Display With Quantum Dot Color Filters
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Solution Overview
Problem
Existing organic light emitting displays face challenges in achieving high color purity and luminous efficiency, particularly in manufacturing processes that are cost-effective and adaptable for various screen sizes, from small mobile devices to large TVs.
Innovation Solution
The organic light emitting display incorporates a substrate with a first and second electrode, at least two organic light emitting layers, and color filters with quantum dot materials, along with a charge generating layer and a buffer layer, formed using soluble materials and a manufacturing method that includes forming electrodes and light emitting layers under normal pressure, enabling efficient light emission and color conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic light emitting displays are manufactured, then basic light emission is achieved, but color purity and luminous efficiency are insufficient
Solution Approach 1:
The patent employs composite materials including quantum dot materials combined with color filter materials, and multiple organic light emitting layers with different materials (e.g., Alq3, BCP, TPBi) to achieve high color purity and luminous efficiency. The quantum dots convert blue light to green and red wavelengths, while the organic layers emit blue, green, and red light, creating a composite system that enhances color purity without significantly increasing manufacturing complexity.
2Illumination intensity
If high color purity is achieved through multiple layers and materials, then color quality improves, but manufacturing cost and process complexity increase
Solution Approach 1:
The display structure is segmented into distinct functional layers: blue organic light emitting layer, green organic light emitting layer, red organic light emitting layer, quantum dot layer, and color filter layer. Each layer is optimized for specific color emission, allowing independent optimization of color purity for each wavelength while maintaining a modular structure that manages complexity through functional separation.
Solution Approach 2:
The quantum dot layer serves multiple functions simultaneously: it converts blue light to green and red wavelengths, acts as a color conversion layer, and enhances overall luminous efficiency. This multi-functionality reduces the need for separate components, thereby managing structural complexity while achieving high color purity.
3Illumination intensity
If complex manufacturing processes are used to achieve high performance, then display quality improves, but productivity and cost-effectiveness decrease
Solution Approach 1:
The patent optimizes parameters such as layer thickness (e.g., 50-200 nm for organic layers, 10-50 nm for quantum dot layer), material concentrations, and deposition conditions to achieve high luminous efficiency. By carefully controlling these parameters, the patent achieves superior display performance while maintaining compatibility with existing manufacturing processes, thereby preserving productivity.
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 color purity and luminous efficiency while reducing manufacturing costs and simplifying the process, making it suitable for diverse screen sizes from small mobile devices to large TVs.
Implementation Method 1
at least two organic light emitting layers between the first electrode and the second electrode; the organic light emitting layers emitting a first color light
Implementation Method 2
The color filters may include a quantum dot material
Data Source
AI summary
An organic light emitting display including a substrate, a first electrode and a second electrode on the substrate and facing each other, at least two organic light emitting layers between the first electrode and the second electrode, and at least two color filters on the second electrode, the organic light emitting layers emitting a first color light, and the color filters emitting a second color light and a third color light.