Two-Story Light Source Device for Miniaturized Projection Displays
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Solution Overview
Problem
Existing projection type display apparatuses face challenges with low luminance when using LED light sources and increased installation area and size due to the arrangement of yellow or green fluorescent substances, red laser, and blue laser light sources on the same plane, leading to larger optical components and housing dimensions.
Innovation Solution
A light source device with a two-story structure where red and blue laser light sources are accommodated in one story and a green fluorescent source in another, with optical synthesizers to combine their light paths, reducing the overall housing size and installation area while maintaining high luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED light sources are used in projection type display apparatus, then reliability and stability are improved, but luminance is reduced
Solution Approach 1:
The patent combines LED light sources with fluorescent substances to create a hybrid light source system. The LED provides reliable excitation light that triggers the fluorescent substance to emit higher luminance light, thus merging the reliability advantage of LED with the high luminance capability of fluorescent materials.
Solution Approach 2:
The patent changes the optical parameters by introducing fluorescent substances with specific emission characteristics. The fluorescent substance converts the LED's excitation light wavelength to a different wavelength range with higher luminance output, effectively changing the light emission parameters to achieve both reliability and high luminance.
2Device complexity
If yellow fluorescent substance, red laser light source and blue laser light source are arranged on the same plane, then light synthesis is simplified, but depth and width of housing increase leading to larger installation area
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration. By arranging the yellow fluorescent substance, red laser light source, and blue laser light source in different vertical layers rather than on the same plane, the housing depth is reduced while maintaining effective light synthesis through optical coupling between layers.
Solution Approach 2:
The patent employs a nested arrangement where the light sources and fluorescent substances are positioned in concentric or overlapping configurations. The blue laser light source is positioned to excite the yellow fluorescent substance, and the red laser light source is integrated in a way that allows all components to share common optical paths and housing space, reducing the overall footprint.
3Area of moving object
If fluorescence divergence angle is larger than laser light divergence angle, then light coverage is improved, but optical component size and light source device size increase
Solution Approach 1:
The patent introduces optical elements such as lenses and light guides as intermediaries between the fluorescent substance and the final optical path. These intermediary components collect and redirect the divergent fluorescence, maintaining wide light coverage while controlling the beam divergence to prevent excessive enlargement of downstream optical components.
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 a high-luminance light source device with reduced installation area and miniaturization, effectively addressing the limitations of previous designs by optimizing the arrangement and synthesis of light paths within a compact housing.
Implementation Method 1
a green light source that emits green fluorescence
Implementation Method 2
The yellow fluorescent substance receives excitation light to emit yellow fluorescence
Data Source
AI summary
A light source device includes a light source accommodating section provided with a story structure including a first accommodation story and a second accommodation story, a red light source that emits red laser light and a blue light source that emits blue laser light being accommodated in the first accommodation story, and a green light source that emits green fluorescence being accommodated in the second accommodation story; an emission window provided on a side of the second accommodation story; a first light synthesizer that synthesizes an optical path of the red laser light from the red light source and an optical path of the blue laser light from the blue light source into one optical path, and that emits first synthesized light into which the red laser light and the blue laser light are synthesized; and a second light synthesizer that synthesizes an optical path of the green fluorescence.