Hybrid Light Source Filtering for Same-Color Projection Beam Mixing
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Solution Overview
Problem
Existing light combining methods, such as using dichroic mirrors and light combining elements, struggle to effectively mix light beams of the same color due to limitations in achieving both transmission and reflection for light beams with similar wavelengths.
Innovation Solution
A hybrid light source system comprising a first and second light source group emitting light beams of the same color but different wavelengths, with a bandpass filter arranged at a 45-degree angle to each light source group, reflecting one and transmitting the other, and a light combining element to combine these beams, allowing for precise wavelength selection and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dichroic mirrors or light combining elements are used to combine light beams, then light beams of different colors can be combined, but light beams of the same color cannot be effectively mixed
Solution Approach 1:
The patent applies parameter changes by using a bandpass filter with specifically designed wavelength characteristics to differentiate between same-color light beams. Instead of relying on color differences, the system changes the wavelength parameter selection to enable discrimination and combination of same-color beams with different wavelength ranges, thereby resolving the limitation of conventional light combining methods
Solution Approach 2:
The patent introduces a bandpass filter as an intermediary element between the light sources and the combining optics. This intermediary component selectively transmits specific wavelength ranges while blocking others, enabling the system to distinguish and properly combine same-color light beams that would otherwise be indistinguishable to conventional dichroic mirrors
2Measurement precision
If a bandpass filter with narrow bandwidth is used to reflect one light beam and transmit another, then precise wavelength control is achieved, but device complexity increases
Solution Approach 1:
The bandpass filter performs multiple functions simultaneously: it acts as a wavelength selector, a beam separator, and a combination enabler. By making this single component multi-functional, the patent achieves precise wavelength control without proportionally increasing overall device complexity, as the filter replaces what would otherwise require multiple separate optical elements
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 system enables effective mixing of light beams of the same color, improving brightness and reducing speckle issues, enhancing display quality in projection devices by utilizing a bandpass filter with narrow bandwidth for precise wavelength control.
Implementation Method 1
the bandpass filter is configured to reflect the light beam of the first light source group and transmit the light beam of the second light source group
Implementation Method 2
an angle of 45 degrees is formed between the emergent direction of the light beam of the first light source group and the bandpass filter
Data Source
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AI summary
The present invention provides a hybrid light source system, the hybrid light source system includes a first light source group, a second light source group, and a bandpass filter. The first light source group and the second light source group emit light beams which are the same in color and different in wavelength range. An emergent direction of a light beam of the first light source group and an emergent direction of a light beam of the second light source group are perpendicular to each other. The bandpass filter is arranged on emergent light paths of the first light source group and the second light source group, an angle of 45 degrees is formed between the emergent direction of the light beam of the first light source group and the bandpass filter, an angle of 45 degrees is formed between the emergent direction of the light beam of the second light source group and the bandpass filter, the bandpass filter is configured to reflect the light beam of the first light source group and transmit the light beam of the second light source group. The bandpass filter with a narrower bandwidth to a transitional wavelength range is used in the present invention to combine two light beams of wavelength ranges very close to each other, thereby meeting requirements on light filling for the light beams of the same color, providing various hybrid light sources required for illumination of projection display devices, and improving display effects of the projection display devices. The present invention further provides a projection display device having the above advantages.