Multi-Emitter Laser Light Source Uniform Illumination
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Solution Overview
Problem
Projection type display devices using multi-emitter laser light sources face challenges in achieving uniform illuminance due to split luminous flux, which affects image brightness and miniaturization, as the luminous flux from multiple emitters can exceed the allowed angle of incidence for integrator optical systems, leading to flux loss and non-uniform illumination.
Innovation Solution
A light source device comprising a combination of multi-emitter and non-multi-emitter laser light sources, with a collimator lens having a cylindrical surface to adjust the laser light, and a light guide unit for color synthesis, along with an integrator optical system to convert the aggregated flux into parallel light, ensuring uniformity and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multi-emitter laser light source is used to increase brightness, then the output power is improved, but the uniformity of illuminance deteriorates due to split luminous flux
Solution Approach 1:
The multi-emitter laser light source is divided into multiple emitter groups, with each group having a dedicated collimator lens. This segmentation allows independent control of luminous flux from each emitter, preventing the flux splitting problem while maintaining high total output power. Each emitter's light is collimated separately before being combined, ensuring uniform illuminance distribution.
Solution Approach 2:
A collimator lens is introduced as an intermediary optical element between the multi-emitter laser light source and the subsequent optical system. This intermediary component converts the divergent light from multiple emitters into parallel beams, preventing flux splitting and maintaining illuminance uniformity while preserving the high power output of the multi-emitter source.
2Power
If the number of emitters is increased to improve brightness, then the output is improved, but the luminous flux exceeds the allowed angle of incidence for integrator optical systems, causing flux loss
Solution Approach 1:
Collimation is performed as a preliminary action before the light enters the integrator optical system. By pre-collimating the light from each emitter group, the angular spread of the luminous flux is reduced to within the allowed incidence angle range of the integrator, preventing flux loss while maintaining high brightness from multiple emitters.
Solution Approach 2:
The multi-emitter source is segmented into groups, each with its own collimator lens. This segmentation ensures that the angular divergence from each segment remains within acceptable limits for the integrator optical system, preventing flux loss even when the total number of emitters is increased for higher brightness.
3Volume of moving object
If a multi-emitter laser light source is used for miniaturization, then the device size is reduced, but the non-uniform illumination affects image quality
Solution Approach 1:
Multiple collimated beams from different emitter groups are merged/combined into a single uniform illumination pattern. The collimator lenses produce parallel beams that can be efficiently combined by the integrator optical system, achieving uniform illuminance distribution while maintaining the compact size benefits of the multi-emitter laser light source.
Solution Approach 2:
The optical parameters (collimation angle, beam diameter) are optimized for each emitter group to ensure that when combined, they produce uniform illuminance. By adjusting these parameters, the patent achieves both miniaturization through multi-emitter sources and uniform illumination quality.
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 enhances illuminance uniformity and brightness while preventing luminous flux splitting, allowing for a compact and high-brightness projection type display device, even with multiple laser sources, by adjusting the far field pattern and optimizing the optical path.
Implementation Method 1
a collimator lens having at least one cylindrical surface that adjusts a laser light emitted from the at least one multi-emitter laser light source
Implementation Method 2
a light guide unit that performs color synthesis of a laser light emitted from the at least one multi-emitter laser light source and having passed through the cylindrical surface and a laser light emitted from the at least one non-multi-emitter laser light source
Data Source
AI summary
Provided is a light source device including a laser light source group including at least one multi-emitter laser light source and at least one non-multi-emitter laser light source that emits a colored light different from that of the multi-emitter laser light source, a collimator lens having at least one cylindrical surface that adjusts a laser light emitted from the at least one multi-emitter laser light source, and a light guide unit that performs color synthesis of a laser light emitted from the at least one multi-emitter laser light source and having passed through the cylindrical surface and a laser light emitted from the at least one non-multi-emitter laser light source.