LED Package UV Shielding for Stable White Light Color Purity
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Solution Overview
Problem
Existing display devices face challenges in achieving high color purity and reproducibility of white light without performance degradation over time, particularly due to damage from ultraviolet rays affecting light absorption parts in planar lighting devices.
Innovation Solution
A light emitting device package incorporating a light absorption part with a specific absorption center wavelength between first and second colors, protected by a protective agent, which converts blue light into white light with improved color purity and is shielded from ambient light, including UV rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light absorption part is used in a planar lighting device to improve color purity of white light, then color purity and reproducibility are improved, but the light absorption part is damaged by ultraviolet rays over time, causing performance degradation
Solution Approach 1:
A protective agent is introduced as an intermediary substance between the light absorption part and the ambient light (particularly UV rays). This protective agent absorbs or blocks the harmful ultraviolet radiation before it can reach and damage the light absorption part, thereby preventing performance degradation while allowing the light absorption part to maintain its color purity enhancement function over time.
Solution Approach 2:
The harmful ultraviolet rays are converted into a beneficial effect by using the protective agent to selectively block UV wavelengths while allowing visible light to pass through. This transforms the previously harmful UV radiation into a controlled factor that can be managed, protecting the light absorption part without compromising the overall lighting performance and color quality.
2Manufacturing precision
If a light absorption part is used to enhance color purity, then color reproduction is improved, but the light absorption part degrades due to exposure to ambient light
Solution Approach 1:
The protective agent serves as a mediator that shields the light absorption part from ambient light exposure. It is positioned between the ambient light source and the light absorption part, filtering out harmful wavelengths and reducing photo-degradation, thereby extending the service life of the light absorption part while maintaining its color reproduction capabilities.
Solution Approach 2:
The protective agent is applied in advance to the light absorption part or integrated into the same structure before the device is put into operation. This preliminary protective measure ensures that the light absorption part is already shielded when exposed to ambient light, preventing degradation from the outset and maintaining color reproduction quality throughout the extended service life.
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 color purity and reproducibility of white light by protecting the light absorption part from damage, maintaining its performance over time and improving the overall quality of planar lighting devices and display devices.
Implementation Method 1
a wavelength conversion part having a first main emission wavelength and a second main emission wavelength and disposed around the light emitting device to convert a wavelength of at least a portion of the light having the first color emitted from the light emitting device to light having a second color
Implementation Method 2
a light absorption part having an absorption center wavelength between the first color and the second color of the wavelength conversion part
Implementation Method 3
a UV protection agent disposed on the light absorption part to protect the light absorption part from ultraviolet rays
Data Source
AI summary
The present disclosure is applicable to technical fields related to a display device, for example, relates to a display device using a composite optical film and a light emitting diode (LED). A light emitting device package includes a light emitting device configured to emit light having a first color, a wavelength conversion part having a first main emission wavelength and a second main emission wavelength and disposed around the light emitting device to convert a wavelength of at least a portion of the light having the first color emitted from the light emitting device to light having a second color, a light absorption part having an absorption center wavelength between the first color and the second color of the wavelength conversion part, and a protective agent configured to protect the light absorption part from at least a portion of ambient light.