Sulfur-Free Encapsulation Layer for Quantum Dot Displays
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Solution Overview
Problem
The use of sulfur-based dispersants in quantum dot materials for light conversion in display devices can lead to sulfidation of metallic materials, causing discoloration and variations in electrical characteristics, particularly with silver-containing components.
Innovation Solution
A light converting component with a layered structure where a sulfur-free encapsulation layer covers the light emitting unit, separating it from sulfur-containing light converting elements, and incorporating zinc to enhance conversion efficiency and uniformity, while maintaining low sulfur content in specific regions to prevent adverse reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur-based dispersants are used in quantum dot materials to improve reliability, then the reliability of quantum dot materials is improved, but sulfidation of metallic materials occurs causing discoloration and electrical characteristic variations
Solution Approach 1:
The light converting component is divided into multiple regions with different sulfur content. The first region (closest to light emitting unit) has low sulfur content to prevent sulfidation, while the second region has higher sulfur content to maintain quantum dot material reliability. This spatial segmentation resolves the contradiction by localizing sulfur in areas where it does not contact metallic materials.
Solution Approach 2:
Different regions of the light converting component have different sulfur content characteristics. The first region has low sulfur content specifically where it contacts or is close to metallic materials, while other regions can have higher sulfur content. This local quality variation allows the system to maintain reliability where needed while avoiding harmful sulfidation effects.
2Illumination intensity
If light converting elements are applied to improve color saturation, then color saturation is improved, but sulfur reactions with metallic materials cause discoloration and electrical characteristic variations
Solution Approach 1:
The light converting component is segmented into regions with different sulfur content. The first region has low sulfur content to prevent discoloration of metallic materials, while maintaining light conversion functionality. This allows color saturation improvement without the harmful discoloration side effect.
Solution Approach 2:
The first region acts as an intermediary layer between the light emitting unit and the second region. It provides a low-sulfur barrier that prevents direct contact between sulfur and metallic materials, while still allowing light conversion to occur. This intermediary structure resolves the contradiction between color saturation and discoloration prevention.
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 effectively prevents sulfidation-related issues such as discoloration and resistivity changes, improving the reliability and performance of the display device by minimizing reactions between sulfur and metallic materials, and enhancing light conversion efficiency and uniformity.
Implementation Method 1
The light converting elements are capable of converting the light emitted from the light emitting devices into white color
Implementation Method 2
incorporating zinc to enhance conversion efficiency and uniformity
Data Source
AI summary
A display includes a light source, wherein the light source includes a base plate, a light emitting unit, and a light converting component. The light emitting unit is disposed on the base plate and has a first top surface. The light converting component covers the light emitting unit and has a second top surface and plural light converting elements, wherein the first top surface is located between the second top surface and the base plate. The light converting component includes a first region, a second region, and a third region from the first top surface to the second top surface, wherein a first sulfur content of the first region is less than a second sulfur content of the second region, and the first sulfur content of the first region is less than a third sulfur content of the third region.