Light Emitting Device Package with Color Calibration Layer
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Solution Overview
Problem
Conventional light emitting device packages struggle to achieve enhanced light quality and a colorful appearance, particularly in lighting apparatuses, due to limitations in wavelength conversion and color calibration, leading to aesthetically unpleasant colors when the device is not in use.
Innovation Solution
A light emitting device package incorporating a wavelength conversion layer that absorbs and converts light of a first wavelength band into a second wavelength band, combined with a color calibration layer on a transparent substrate, which calibrates the color and reduces saturation, using materials like yellow phosphor, blue, and green phosphors or pigments to achieve a color close to white.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wavelength conversion layer is used to convert light wavelength, then light quality is improved, but color saturation becomes excessive and aesthetically unpleasant
Solution Approach 1:
A color calibration layer is introduced as an intermediary between the wavelength conversion layer and the external environment. This layer contains pigments or phosphors that absorb excess saturated light and convert it to less saturated wavelengths, thereby calibrating the overall color output to achieve aesthetically pleasing appearance while maintaining the wavelength conversion function.
Solution Approach 2:
The color calibration layer utilizes color conversion mechanisms through pigments or phosphors to transform the color characteristics of the light. By selecting specific color materials with appropriate absorption and emission properties, the layer modifies the color saturation and hue to achieve desired aesthetic appearance.
2Use of energy by moving object
If conventional wavelength conversion materials are used, then light conversion is achieved, but color calibration is insufficient leading to poor aesthetic appearance
Solution Approach 1:
The patent employs composite material structures combining the wavelength conversion layer with the color calibration layer. Each layer contains specific materials (phosphors, pigments) with complementary properties that work together to achieve both efficient wavelength conversion and proper color calibration, resulting in superior overall light quality.
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 enhances light quality by producing white light with reduced color saturation, improving the aesthetic appeal by minimizing color difference from white, and increasing light extraction efficiency by approximately 6% to 10% through a recessed pattern in the color calibration layer.
Implementation Method 1
a wavelength conversion layer located on the transparent substrate, wherein the wavelength conversion layer absorbs and converts at least a part of the light having the first wavelength band into light having a second wavelength band
Data Source
AI summary
A semiconductor device, and more particularly a light emitting device package usable with a lighting apparatus is disclosed. The light emitting device package comprises a package body, a light emitting device located on the package body, the light emitting device emitting light having a first wavelength band, a transparent substrate located over the light emitting device with a distance therebetween, a wavelength conversion layer located on the transparent substrate, wherein the wavelength conversion layer absorbs and converts at least a part of the light having the first wavelength band into light having a second wavelength band, and a color calibration layer located on the wavelength conversion layer, the color calibration layer calibrating color of the wavelength conversion layer.