Laser light emitting device, light source and projection display system

Abstract

The invention relates to a laser light emitting device, a light source and a projection display system. The laser light emitting device includes a plurality of lasers used for emitting a plurality of parallel laser beams, a focusing lens used for focusing the plurality of parallel laser beams, and a light scattering component located at the rear end of the light path of the focusing lens; the light scattering component is located at a light path position A, so that the diameter of a circumcircle of a region jointly formed by light spots on the light scattering component which are formed through irradiation of the plurality of laser beams is smaller than 1 / 5 of the diameter of a circumcircle of a region jointly formed by light spots on the section of the plurality of parallel laser beams; and the scattering angle of the light scattering component is not smaller than 2 / 3 of a maximum included angle of adjacent laser beams after focusing. Compared with the prior art, outgoing beams of the laser light emitting device of the invention are collimating with light spots uniformly distributed, and therefore, optical extension quantity is smaller; and the outgoing beams can be overlapped with each other without a long light path required, and therefore, a required space is small.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a laser light emitting device, a light source and a projection display system using the laser light emitting device. Background technique [0002] Projection technology has been widely used in our life and work, such as projectors. At present, the light source in projection technology is still dominated by high-pressure mercury lamps. However, the lifespan of the high-pressure mercury lamp is only a few thousand hours. If the lamp is used for a long time, it will dim and affect the display effect. Alternatives to high-pressure mercury lamps include LED light sources and laser light sources, both of which have the advantage of long life, but the difference is that LED light sources are not bright enough but cheap, and laser light sources are bright but expensive. [0003] From the perspective of technological development, it is an inevitable trend for laser light sources to r...

AI Technical Summary

Problems solved by technology

At the same time, in order to fully homogenize the light spots, a relatively long optical path is required to make each light spot fully overlap each other, which requires relatively high space requirements and the structure is not compact enough.

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