Quantum Dot Polymer Composite Layered Structure for LCD
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face decreased luminous efficiency due to limitations in the color filter layer, necessitating improvements to enhance light emission and color reproducibility.
Innovation Solution
A layered structure comprising a luminescent layer with a quantum dot polymer composite pattern, an organic layer, and an inorganic layer, where the inorganic layer includes metal oxides or nitrides, is introduced. This structure features a quantum dot polymer composite pattern with a polymer matrix and quantum dots, an organic layer for surface planarization, and an inorganic layer for enhanced light emission and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional color filter layer is used in LCD, then the device structure is simple, but the luminous efficiency is decreased
Solution Approach 1:
The patent applies composite materials by combining quantum dots with polymer matrices to form quantum dot polymer composite patterns. This composite structure enables photoluminescent conversion with high efficiency, replacing conventional absorption-type color filters and significantly improving luminous efficiency while maintaining device functionality.
Solution Approach 2:
The patent changes the material parameters by using inorganic materials (metal oxides, metal nitrides, metal oxynitrides, or metal sulfides) with specific optical and thermal properties. These parameter changes enable the layered structure to maintain high photoconversion efficiency after heat treatment and improve overall luminous efficiency.
2Loss of energy
If quantum dot polymer composite pattern is formed, then the luminous efficiency is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent segments the manufacturing process into distinct sequential steps: forming the quantum dot polymer composite pattern, depositing the organic layer, and depositing the inorganic layer. This segmentation allows each layer to be optimized independently and simplifies the overall manufacturing process despite the enhanced functionality.
Solution Approach 2:
The patent introduces an organic layer as an intermediary between the luminescent layer and the inorganic layer. This intermediary layer facilitates surface planarization and ensures proper interface properties, enabling the successful integration of quantum dot composites with inorganic materials while managing the manufacturing complexity.
3Ease of manufacture
If heat treatment is applied to the quantum dot polymer composite, then the manufacturing process is completed, but the photoconversion efficiency may decrease
Solution Approach 1:
The patent uses composite materials with specific thermal stability properties that allow the quantum dot polymer composite to withstand heat treatment processes without significant degradation of photoconversion efficiency. The composite structure maintains its optical properties after heat treatment, enabling complete manufacturing processes.
Solution Approach 2:
The patent selects inorganic materials with specific thermal and optical parameters that remain stable after heat treatment. These parameter-chosen materials ensure that the layered structure maintains high photoconversion efficiency even after undergoing necessary heat treatment processes during manufacturing.
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 layered structure significantly improves luminous efficiency and maintains high photoconversion efficiency even after heat treatment, reducing defects and enhancing light utilization efficiency while maintaining brightness and color purity.
Implementation Method 1
a luminescent layer including a quantum dot polymer composite pattern... the quantum dot polymer composite pattern includes a repeating section including a polymer matrix and a plurality of quantum dots (e.g., dispersed) in the polymer matrix
Data Source
AI summary
A layered structure including a luminescent layer including a quantum dot polymer composite pattern; an inorganic layer disposed on the luminescent layer, the inorganic layer including a metal oxide, a metal nitride, a metal oxynitride, a metal sulfide, or a combination thereof; and an organic layer being disposed between the luminescent layer and the inorganic layer, the organic layer including an organic polymer, a method of producing the same, and a liquid crystal display including the same. The quantum dot polymer composite pattern includes a repeating section including a polymer matrix; and a plurality of quantum dots (e.g., dispersed) in the polymer matrix, the repeating unit including a first section configured to emit light of a first light, and wherein the inorganic layer is disposed on at least a portion of a surface of the repeating section.