Optical Member With Protective Layer For LED Backlight
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Solution Overview
Problem
Current LED backlight units face challenges in reducing light loss and improving color uniformity when using blue LEDs and quantum dots to produce white light for display devices.
Innovation Solution
An optical member comprising a matrix with wavelength conversion particles and a protective layer is introduced, which receives light from a light source and converts it to improve color reproducibility and efficiency, featuring Quantum Dots (QDs) for wavelength conversion and a protective layer to enhance durability and optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used for wavelength conversion in LED backlight units, then color reproducibility and brightness are improved, but light loss and color uniformity issues persist
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component between the LED and quantum dots. This light guide plate uniformly distributes the blue light from the LED before it reaches the quantum dots, improving both brightness distribution and reducing localized light loss. The light guide plate acts as a mediator that optimizes the interaction between the light source and wavelength conversion particles.
Solution Approach 2:
The patent optimizes the size, shape, and distribution parameters of the quantum dots to improve conversion efficiency. By controlling the particle size distribution and spatial arrangement of quantum dots, the system achieves better color reproducibility while minimizing light loss through enhanced optical coupling and reduced scattering.
2Manufacturing precision
If quantum dots are used for wavelength conversion, then color reproducibility is improved, but color uniformity across the display remains challenging
Solution Approach 1:
The patent divides the quantum dot layer into multiple discrete particles distributed throughout a matrix material rather than using a continuous layer. This segmentation allows for better control over the spatial distribution of wavelength conversion properties, ensuring uniform color output across the entire display area while maintaining high color reproducibility.
Solution Approach 2:
The patent creates local variations in quantum dot concentration and size within different regions of the backlight unit. By adjusting the local composition and distribution of quantum dots in specific areas, the system achieves uniform overall color output while maintaining high color reproducibility in each local region.
3Reliability
If a protective layer is added around the matrix, then reliability and durability are improved, but device complexity increases
Solution Approach 1:
The patent combines the protective layer function with the existing encapsulation structure of the LED module. The protective coating is integrated into the same manufacturing process as the quantum dot matrix encapsulation, merging multiple protective functions into a single layered structure that prevents moisture and oxygen ingress while maintaining simplicity.
Solution Approach 2:
The patent uses thin film protective layers with flexible molecular structures that can conform to the quantum dot matrix geometry. These thin protective films provide effective environmental protection without adding significant structural complexity or thickness to the overall device assembly.
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 optical member effectively converts light to achieve high brightness and excellent color reproducibility, reducing light loss and improving color uniformity in LED backlight units, thereby enhancing the performance of display devices.
Implementation Method 1
a plurality of wavelength conversion particles in the matrix; wherein the protective layer surrounds the matrix
Implementation Method 2
many techniques for realizing white light using a blue LED and a quantum dot (QD) as a fluorescent substance to emit red light and green light
Data Source
AI summary
Provided are an optical member, a display device including the same, and a method of fabricating the same. The optical member includes: a matrix; a plurality of wavelength conversion particles in the matrix; and a protective layer surrounding the matrix.