Wavelength Converting Material Spacing for LCD Lighting Efficiency
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Solution Overview
Problem
Existing lighting devices with wavelength converting materials often suffer from reduced efficiency due to heat absorption and light absorption, as the materials are typically integrated close to the light source, which can lead to decreased performance in converting light wavelengths for applications like liquid crystal displays.
Innovation Solution
A lighting device design where a wavelength converting material is spaced apart from the light source, utilizing a reflector and a waveguide to direct light towards the wavelength converting material, which is placed on the reflector, allowing for efficient conversion and reflection of light onto the surface to be illuminated, while keeping the material away from heat sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wavelength converting material is integrated close to the light source, then the device structure is simpler, but the efficiency of light conversion decreases due to heat absorption and light absorption
Solution Approach 1:
The patent extracts the wavelength converting material from its conventional position adjacent to the light source and relocates it to a separate location on the reflector. This spatial separation removes the material from the harmful thermal and optical environment near the LED, thereby reducing energy loss through heat absorption and light absorption while maintaining the functional integrity of the device
Solution Approach 2:
The patent introduces a reflector as an intermediary component between the light source and the wavelength converting material. The reflector serves as a mediator that redirects light from the LED toward the converting material, enabling the material to receive sufficient light for effective conversion while being positioned away from the heat-generating light source
2Device complexity
If the wavelength converting material is integrated close to the light source, then the device structure is simpler, but heat dissipation becomes problematic
Solution Approach 1:
The patent extracts the wavelength converting material from the heat-prone environment near the light source and positions it on the reflector where heat dissipation is more effective. This spatial extraction separates the heat-generating LED from the heat-sensitive converting material, allowing each component to operate in its optimal thermal environment
Solution Approach 2:
The patent utilizes the reflector, which is typically designed to reflect light, as an additional heat management component. By placing the wavelength converting material on the reflector, the system converts the reflector's surface area into a beneficial heat dissipation surface, turning a purely optical component into a dual-function element that aids in thermal management
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
This configuration enhances the efficiency of light conversion by reducing heat absorption and allowing for better heat dissipation, resulting in improved color characteristics and light distribution without compromising the performance of the wavelength converting material.
Implementation Method 1
The waveguide is configured to direct a majority of light from the light source toward the reflector
Implementation Method 2
At least a portion of the light is converted by the wavelength converted material
Implementation Method 3
reflected by the reflector, and incident on the surface to be illuminated
Data Source
AI summary
A device includes a reflector and a wavelength converting material disposed on the reflector. A backlight is disposed between the reflector and a surface to be illuminated, such as a liquid crystal display panel. The backlight includes a light source and a waveguide. The waveguide is configured to direct a majority of light from the light source toward the reflector. At least a portion of the light is converted by the wavelength converted material, reflected by the reflector, and incident on the surface to be illuminated.