White LED Quantum Dot Segmentation for Cost Reduction
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Solution Overview
Problem
Conventional quantum dot phosphor-based backlight modules for liquid crystal display devices face high costs due to material consumption and manufacturing complexity, and limited flexibility due to the need for large-area uniform coatings and fragile glass tubes, which are difficult to replace or modify.
Innovation Solution
A white LED structure comprising a substrate with monochromatic LED chips, a reflector cup, and encapsulating colloid containing first and second quantum dot structures sealed in glass cases, which mix light to produce white light, enhancing security and reducing costs by preventing phosphor leakage and using durable, low-cost glass cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot phosphor film is used to achieve high color gamut, then color saturation is improved, but manufacturing cost increases due to high material consumption and coating complexity
Solution Approach 1:
The patent segments the quantum dot phosphor into multiple discrete particles dispersed in encapsulating colloid rather than using a continuous film. This segmentation reduces material consumption while maintaining color saturation, as the particles can be sparsely distributed yet still provide sufficient phosphorescent conversion.
Solution Approach 2:
The patent changes the physical state and distribution parameters of the quantum dot phosphor from a continuous film coating to discrete particles suspended in colloid. This parameter change simplifies the manufacturing process from precise coating operations to simpler dispensing or injection methods, reducing manufacturing cost while preserving color quality.
2Reliability
If quantum dot phosphor glass tube is used to seal phosphors, then phosphor leakage is prevented, but device complexity increases and fragility increases
Solution Approach 1:
The patent replaces the rigid glass tube with a flexible encapsulating colloid medium that seals the quantum dot phosphor particles. This colloid acts as a flexible containment medium that prevents phosphor leakage without requiring complex glass sealing processes, reducing device complexity and improving durability.
3Area of stationary object
If quantum dot phosphor film is used for large area coverage, then backlight coverage is improved, but coating uniformity requirements increase and cost increases
Solution Approach 1:
The patent uses discrete quantum dot phosphor particles dispersed in colloid instead of a continuous film. This segmentation allows the particles to be distributed over large areas without requiring precise coating uniformity, as the particles can settle or be distributed more tolerantly across the display area while still providing adequate phosphorescent conversion.
4Illumination intensity
If optical films with different frameworks are used, then optical performance is improved, but adaptability decreases due to chrominance and luminance variations
Solution Approach 1:
The patent creates a homogeneous encapsulating colloid medium that uniformly suspends the quantum dot phosphor particles. This homogeneous medium provides consistent optical properties regardless of the specific optical film framework used, improving adaptability across different display designs while maintaining optical performance.
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 solution provides a cost-effective and flexible white LED solution that enhances security by encapsulating quantum dot phosphors in glass cases, preventing leakage and breakage, while maintaining high color gamut and energy efficiency for liquid crystal display devices.
Implementation Method 1
a first quantum dot structure and a second quantum dot structure sealed in the encapsulating colloid, wherein light generated by the monochromatic LED chip, light generated by exciting the first quantum dot structure and light generated by exciting the second quantum dot structure are mixed to form a white light
Data Source
AI summary
A white LED, which includes a substrate, at least one monochromatic LED chip disposed on the substrate, a reflector cup disposed on the substrate and surrounding the monochromatic LED chip, an encapsulating colloid filled in the reflector cup to seal the monochromatic LED chip, and a first quantum dot structure and a second quantum dot structure sealed in the encapsulating colloid, and light generated by the monochromatic LED chip, light generated by exciting the first quantum dot structure and light generated by exciting the second quantum dot structure are mixed to form a white light. A backlight module having the white LED and a liquid crystal display device having the backlight module is also disclosed.