Solid-State Light Source Device for Projection Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projection-type display apparatuses using super or ultra high-pressure mercury lamps face issues with UV stress on organic materials, short lifetime, electrode abrasion, cloudiness, and difficulty in waste disposal, while solid-state light sources struggle to provide a point-like white light source with sufficient intensity and color balance.
Innovation Solution
A solid-state light source device utilizing blue light emitting diodes or semiconductor lasers with a fluorescent substance like YAG to produce yellow light, combined with a reflecting and wavelength converting portion on a thermally conductive base, creating a point-like white light source through excitation and conversion processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If super or ultra high-pressure mercury lamps are used as light sources, then high brightness and efficiency are achieved, but UV stress on organic materials, short lifetime, electrode abrasion, and cloudiness occur
Solution Approach 1:
The invention extracts and eliminates the harmful UV component from the light source system by replacing mercury lamps with solid-state light sources that do not generate UV radiation, thereby removing the root cause of UV stress on organic materials while maintaining visible light output for illumination
Solution Approach 2:
The invention changes the fundamental operating parameters of the light source from high-voltage discharge (mercury lamps) to low-voltage solid-state emission (LEDs), transitioning from gas-phase to solid-phase light generation, which inherently eliminates UV stress and electrode wear while improving lifetime and reliability
2Illumination intensity
If super or ultra high-pressure mercury lamps are used as light sources, then high brightness is achieved, but difficulty in waste disposal due to mercury content occurs
Solution Approach 1:
The invention converts the harmful mercury-containing discharge lamp system into a beneficial solid-state LED system that eliminates mercury waste disposal issues while maintaining or improving illumination performance, turning an environmentally harmful technology into an eco-friendly solution
3Reliability
If solid-state light sources are used, then energy saving and long lifetime are achieved, but insufficient brightness and color balance problems occur
Solution Approach 1:
The invention employs composite material strategies by combining multiple phosphor materials with different emission characteristics (yellow phosphor with blue LED, red phosphor) to create a composite light output that achieves both high brightness and accurate color balance, overcoming the limitations of single-phosphor systems
4Use of energy by moving object
If solid-state light sources are used, then energy saving is achieved, but color shading occurs
Solution Approach 1:
The invention applies local quality optimization by using multiple LED chips with different characteristics (high-brightness LEDs and ordinary LEDs) in different positions within the light source assembly, and employing phosphor materials with specific emission properties in different regions to achieve uniform color distribution across the entire light output, preventing color shading
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 enables a solid-state light source that provides a point-like white light source, improving optical performance, reducing color shading, and enhancing the longevity and shock resistance of the display apparatus while minimizing power consumption.
Implementation Method 1
utilizing blue light emitting diodes or semiconductor lasers with a fluorescent substance like YAG to produce yellow light
Implementation Method 2
blue light emitting diodes or semiconductor lasers
Data Source
Figure 1~2
Figure 3~4B
Figure 5
AI summary
A solid-state light source device, enabling to build up with using solid-state elements, and having the structure suitable to be applied as a light source for a projection-type display apparatus, comprises a solid-state light source unit 10 for emitting excitation light therefrom, a reflection mirror (or reflector) 130 made of a parabolic surface, for condensing the excitation light from the solid-state light source to be point-like, and a disc-like (or wheel) member 140, repeating reflection/scattering or transmission/scattering of the excitation light and conversion of the excitation light, alternately, in vicinity of a focus point of the excitation light, which is condensed to be point-like by the reflection mirror (or reflector), wherein the excitation light (B-color) reflected/or scattered by that disc-like (or wheel) member and fluorescence light (Y-color), wavelength of which is converted, is taken on a same optical path, by means of the reflection mirror (or reflector) 130 or a second reflection mirror (or reflector) 130', and thereby outputting a white color light emitting from a point-like light source.