LED Package With Glass Cell Quantum Dot Protection
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Solution Overview
Problem
Quantum dots used in LED packages degrade quickly when exposed to light, moisture, and high temperatures, leading to reduced light utilization efficiency and shortened lifespan, which affects the color reproducibility and brightness of LCD devices.
Innovation Solution
An LED package design featuring a glass cell with quantum dots dispersed in a resin or organic solvent, separated from the LED to prevent direct contact and exposure, enhancing emission efficiency and longevity by using a reflective frame and specific quantum dot combinations for desired color output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are disposed adjacent to the LED excitation source, then the LED package achieves desired emission color and high brightness, but the quantum dot degrades quickly due to exposure to light, moisture and high temperature
Solution Approach 1:
The patent divides the system into separate functional components: the LED excitation source and the quantum dot emission layer are spatially separated by a light guide plate. This segmentation allows the quantum dot to be positioned away from the harsh environment (light, heat, moisture) of the LED while still receiving excitation light through the light guide, thereby maintaining stability while achieving desired emission color and brightness.
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component between the LED and quantum dot. This mediator transports the excitation light from the LED to the quantum dot location while physically isolating the quantum dot from the LED's harsh operating conditions (high temperature, intense light, moisture), thus preventing degradation while maintaining functional efficiency.
2Manufacturing precision
If quantum dots are used as fluorescent material combined to the LED, then the LED package achieves narrow FWHM emission spectrum and wide color gamut, but the quantum dot degrades in short time due to light exposure and environmental factors
Solution Approach 1:
The patent segments the excitation source and emission material into separate locations connected by a light guide plate. This allows the quantum dot to maintain its precise emission spectrum characteristics while being protected from degradation factors, thus extending lifespan without compromising spectral precision.
Solution Approach 2:
The patent creates a protected environment for the quantum dot by enclosing it in a sealing structure that prevents moisture and oxygen exposure. This inert environment protection allows the quantum dot to maintain its narrow FWHM emission spectrum and wide color gamut properties while significantly extending its operational lifespan.
3Manufacturing precision
If the wavelength band of light passing through the color filter is decreased to improve color reproducibility, then color accuracy improves, but light utilization efficiency is reduced
Solution Approach 1:
The patent changes the fundamental parameter of light emission by using quantum dots with naturally narrow FWHM emission spectra. This eliminates the need to restrict the wavelength band through color filters, as the quantum dot inherently emits light in a narrow, precise wavelength range that matches the required color reproduction bandwidth, thus maintaining both color accuracy and light utilization efficiency.
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 an LED package with stable emission color, high brightness, and extended lifespan, significantly improving color reproducibility and brightness in LCD devices by preventing quantum dot degradation and optimizing light usage.
Implementation Method 1
The quantum dot uses light from the LED as an excitation source and emits light with a longer wavelength than that of the excitation source
Implementation Method 2
a glass cell over the LED, the glass cell includes a quantum dot dispersed in one of a resin and an organic solvent
Data Source
AI summary
Disclosed is a light emitting diode package that includes: a frame having a light emitting diode (LED) thereon; and a glass cell over the LED, the glass cell including a quantum dot dispersed in one of a resin and an organic solvent.