Fluorinated Low Refractive Index Layers for Simpler Quantum Dot Displays
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Solution Overview
Problem
Display apparatuses face challenges in achieving high luminous efficiency while maintaining a simplified structure, particularly due to the complexity introduced by color conversion units.
Innovation Solution
The display apparatus incorporates a substrate with first, second, and third light-emitting devices, each with a corresponding quantum dot layer, a low refractive index layer containing varying fluorine content and particle density, and color filter layers to enhance light transmission and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If color conversion units are added to improve luminous efficiency, then luminous efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the color conversion function into the quantum dot layer itself, which is already present for color filtering. The quantum dot layer serves dual purposes: filtering specific wavelengths and converting colors through photoluminescence, eliminating the need for separate color conversion units and reducing overall device complexity while maintaining high luminous efficiency
Solution Approach 2:
The quantum dot layer is designed to perform multiple functions simultaneously: it acts as a wavelength filter for the blue light emitter and as a color conversion element for generating green and red light through photoluminescence. This multi-functionality reduces the number of separate components needed in the display device
2Manufacturing precision
If quantum dot layers are added for color conversion, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the quantum dot layer with the color filter layer into a single integrated structure. The quantum dots are embedded within the color filter matrix, allowing both color filtering and quantum dot-based color conversion to occur in the same layer, thereby improving color accuracy without adding separate structural components
Solution Approach 2:
The color filter layer is constructed as a composite material system containing both organic dye molecules and inorganic quantum dots. This composite structure enables the layer to simultaneously perform absorption-based filtering and photoluminescence-based color conversion, achieving superior color accuracy while maintaining a simplified single-layer architecture
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 improves luminous efficiency and simplifies the structure by optimizing light emission and conversion processes, enhancing overall performance.
Implementation Method 1
a low refractive index layer over the second-color quantum dot layer and the third-color quantum dot layer to correspond to the first through third light-emitting devices
Implementation Method 2
a second-color quantum dot layer over the second light-emitting device, a third-color quantum dot layer over the third light-emitting device
Data Source
AI summary
A display apparatus includes a first through a third light-emitting devices, each including a first-color emission layer and being over a substrate; a second-color quantum dot layer over the second light-emitting device; a third-color quantum dot layer over the third light-emitting device; and a low refractive index layer over the second-color quantum dot layer and the third-color quantum dot layer to correspond to the first through third light-emitting devices, and including a matrix part and a plurality of particles in the matrix part, wherein a first portion of the matrix part close to the first through third light-emitting devices includes fluorine.