LED Package with Nanocrystal Conversion and Barrier Layers
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Solution Overview
Problem
Liquid crystal display devices using cold cathode fluorescent lamps (CCFLs) face issues with non-uniform luminance and deteriorated color purity, especially in larger screens, and semiconductor nanocrystals in LED backlight units have low thermal stability, leading to reliability concerns.
Innovation Solution
An LED package is designed with a light-scattering structure and a light conversion layer containing semiconductor nanocrystals, separated from the LED light source to prevent degradation and enhance light dispersion, using a stack structure with an organic barrier layer and inorganic barrier layers to improve color reproducibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If semiconductor nanocrystals are used in LED backlight units for improved color purity, then color reproducibility is enhanced, but thermal stability deteriorates leading to reliability concerns
Solution Approach 1:
The patent introduces an organic barrier layer as an intermediary substance between the semiconductor nanocrystals and the LED light source. This barrier layer mediates the thermal interaction, protecting the nanocrystals from direct thermal exposure while allowing the system to maintain improved color reproducibility. The barrier layer acts as a thermal buffer that prevents direct heat transfer from the LED to the temperature-sensitive nanocrystals.
Solution Approach 2:
The patent creates a composite structure combining semiconductor nanocrystals with an organic barrier layer material. This composite approach allows the system to leverage the optical benefits of nanocrystals (improved color reproducibility) while the barrier layer material provides thermal protection. The composite structure integrates materials with complementary properties to simultaneously address both color quality and thermal stability requirements.
2Volume of moving object
If LED light source is placed close to light conversion layer for compact design, then device size is reduced, but light dispersion uniformity deteriorates
Solution Approach 1:
The patent introduces a vertical stacking dimension by placing the light-scattering structure and light conversion layer in a stacked configuration above the LED light source. This vertical arrangement allows compact horizontal footprint while maintaining adequate vertical separation between the LED and the conversion layer, enabling both compact device size and uniform light dispersion through the stacked geometry.
Solution Approach 2:
The patent introduces a light-scattering structure as an intermediary element between the LED light source and the light conversion layer. This intermediary structure diffuses and redistributes the light before it reaches the conversion layer, ensuring uniform light dispersion even when the overall device size is reduced. The scattering structure acts as a light redistribution mediator that maintains optical uniformity in compact configurations.
3Volume of moving object
If light-scattering structure is placed close to LED for compact design, then device size is reduced, but semiconductor nanocrystal degradation increases
Solution Approach 1:
The patent utilizes vertical stacking to arrange components in the vertical dimension rather than spreading them horizontally. The light-scattering structure and light conversion layer are stacked above the LED in the vertical direction, enabling compact horizontal device footprint while maintaining sufficient vertical distance to protect nanocrystals from thermal degradation. This dimensional reorganization allows both compact size and nanocrystal protection.
Solution Approach 2:
The patent introduces an organic barrier layer as a protective intermediary between the LED light source (and associated heat) and the semiconductor nanocrystals in the light conversion layer. This barrier layer mediates the thermal exposure, reducing heat transfer to the nanocrystals and preventing degradation while allowing the device to maintain a compact overall size through efficient vertical stacking.
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 achieves uniform light dispersion, improved color reproducibility, and high reliability by preventing semiconductor nanocrystal degradation, maintaining luminous efficiency over time and ensuring stable performance under high temperatures.
Implementation Method 1
a light conversion layer disposed on at least one surface selected from an inner surface and an outer surface of the light-scattering structure and configured to convert light emitted from the LED into white light
Implementation Method 2
a light-scattering structure spaced apart from the LED
Data Source
AI summary
A light emitting diode (LED) package includes: an LED; a stack structure including a light-scattering structure spaced apart from the LED, and a light conversion layer disposed on at least one surface selected from an inner surface and an outer surface of the light-scattering structure and configured to convert light emitted from the LED into white light, wherein the light conversion layer includes a semiconductor nanocrystal; and an organic barrier layer disposed on a surface of the light conversion layer.