Polarization Mirror Laser Light Source Device
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Solution Overview
Problem
Conventional light source devices for projection display apparatuses face challenges in achieving high luminance and compact size while maintaining efficiency, particularly in combining blue, green, and red laser light sources effectively.
Innovation Solution
The use of a light source device configuration that includes multiple laser light sources, polarization mirrors with characteristics of polarization beam splitters and dichroic mirrors, a retardation plate, and a filter element to efficiently combine green, blue, and red laser beams, resulting in a compact, high-efficiency light source with a wide color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light source devices use multiple laser light sources with dichroic mirrors and diffusion plates, then luminance can be increased, but device size increases and complexity increases
Solution Approach 1:
The patent merges the functions of the dichroic mirror and polarization beam splitter into a single polarization mirror that combines light beams from multiple laser light sources. This integration reduces the number of optical components and compactly combines blue, green, and red laser beams into a single optical path, thereby increasing luminance while reducing device size.
Solution Approach 2:
The polarization mirror serves multiple functions simultaneously: it acts as both a dichroic mirror for wavelength-based beam combining and a polarization beam splitter for polarizing light from different laser sources. This multi-functionality eliminates the need for separate dichroic mirrors and diffusion plates, reducing device complexity and size while maintaining high luminance output.
2Adaptability or versatility
If conventional light source devices use multiple dichroic mirrors and diffusion plates to combine laser beams, then color gamut can be widened, but device complexity increases
Solution Approach 1:
The patent combines the beam combining function and polarization splitting function into a single polarization mirror, eliminating the need for multiple dichroic mirrors and diffusion plates. This merger maintains the ability to combine blue, green, and red laser beams for wide color gamut while significantly reducing device complexity.
Solution Approach 2:
The polarization mirror performs dual functions as both a wavelength-selective beam combiner and a polarization beam splitter, replacing multiple specialized optical components. This multi-functionality achieves wide color gamut through effective laser beam combination while minimizing the number of components and simplifying the overall device structure.
3Illumination intensity
If conventional light source devices use traditional beam combining methods, then luminance can be increased, but speckle noise and luminance unevenness occur
Solution Approach 1:
Instead of using conventional diffusion plates to randomize light paths (which increase device size), the patent inverts the approach by using polarization manipulation. The polarization mirror and subsequent polarization optics control the combination of laser beams in a way that maintains uniform luminance distribution and reduces speckle noise through coherent beam combining rather than incoherent diffusion.
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 enables the construction of a compact and highly efficient light source device that achieves high luminance and a wide color gamut, effectively eliminating speckle noise and luminance unevenness, thereby enhancing the performance of projection display apparatuses.
Implementation Method 1
a first polarization mirror that combines light from the plurality of first laser light sources and transmits light from the second laser light source
Implementation Method 2
a dichroic mirror that combines the light from the plurality of first laser light sources and the light from the second laser light source
Implementation Method 3
a second polarization mirror that combines light from the plurality of third laser light sources and transmits the light from the plurality of first laser light sources and the light from the second laser light source
Implementation Method 4
a retardation plate that converts polarization of light from the second polarization mirror into circular polarization
Implementation Method 5
a filter element that reflects light from the retardation plate
Data Source
AI summary
A light source device includes: a plurality of first laser light sources, a second laser light source, and a plurality of third laser light sources; a first polarization mirror that combines light from the plurality of first laser light sources and transmits light from the second laser light source; a dichroic mirror that combines the light from the plurality of first laser light sources and the light from the second laser light source; a second polarization mirror that combines light from the plurality of third laser light sources and transmits the light from the plurality of first laser light sources and the light from the second laser light source; a retardation plate that converts polarization of light from the second polarization mirror into circular polarization; and a filter element that reflects light from the retardation plate.