OLED Pixel Defining Layer with Carbon Quantum Dots
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Solution Overview
Problem
High-resolution OLED displays face issues with color mixture between pixels due to decreased distance between them, leading to reduced color purity and contrast ratio.
Innovation Solution
Incorporating carbon quantum dots in the pixel defining layer of OLED displays, which absorb and emit light of specific wavelengths to prevent color mixture and enhance color purity by controlling the diameter of the quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between pixels is decreased to increase resolution, then the resolution is improved, but color mixture occurs between pixel areas
Solution Approach 1:
The pixel defining layer is configured with different properties in different regions: the first pixel defining layer has quantum dots with a first diameter, while the second pixel defining layer has quantum dots with a second diameter (smaller than the first). This local variation in quantum dot size creates different light absorption characteristics in different regions, allowing the structure to prevent color mixture while maintaining high resolution.
Solution Approach 2:
The invention changes the physical parameter of quantum dot diameter to control light absorption properties. By using quantum dots with different diameters in different pixel defining layers, the light absorption characteristics are adjusted to prevent color mixture between adjacent pixels, thereby resolving the contradiction between high resolution and color purity.
2Ease of manufacture
If the pixel defining layer structure is simplified, then the manufacturing process is easier, but color mixture prevention becomes less effective
Solution Approach 1:
The pixel defining layer is constructed as a composite structure with two distinct layers: a first pixel defining layer containing quantum dots with a first diameter, and a second pixel defining layer containing quantum dots with a second diameter. This composite structure combines the benefits of multiple material properties in a single integrated layer, achieving effective color mixture prevention while maintaining ease of manufacture through a systematic layered approach.
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
The use of carbon quantum dots in the pixel defining layer effectively reduces color mixture between pixels, improving color purity and contrast ratio in high-resolution OLED displays.
Implementation Method 1
the pixel defining layer includes quantum dots... which absorb and emit light of specific wavelengths
Implementation Method 2
the pixel defining layer includes quantum dots... which absorb and emit light of specific wavelengths
Data Source
AI summary
An organic light emitting display device is capable of substantially preventing the occurrence of color mixture and improve the color purity, the organic light emitting display device including: a substrate; a first electrode on the substrate; a pixel defining layer defining a first opening which exposes at least a portion of the first electrode; a first organic light emission layer on the first electrode; and a second electrode on the first organic light emission layer, wherein the pixel defining layer may include quantum dots.