Laser projection light source for achieving uniform no-speckle illumination

Abstract

The invention discloses a laser projection light source for achieving uniform no-speckle illumination, and the light source comprises a laser for generating laser light; a scattering sheet which enables a light beam to be scattered, enlarges a divergence angle of the light beam, enlarges the area of the light source, and reduces the coherence of a light field; an optical integration rod which enables the light beam to be reflected many times in the optical integration rod, improves the distribution uniformity of the light field, and reduces the coherence of the light field; a reflection bowl which is used for collecting the emergent light of the optical integration rod, reduces the divergence angle of the light beam, and enables light to be emitted outwards in parallel as much as possible; a double-row fly-eye lens array which collects the light of the reflection bowl, reduces the divergence angle of the light, and improves the distribution uniformity and parallelism of the light field; and a field lens which gathers light, reduces the divergence angle, and improves the uniformity.

Description

technical field [0001] The invention relates to a light source in the field of laser projection display, in particular to a laser projection light source for realizing uniform and speckle-free illumination. Background technique [0002] Laser projection display has the advantages of wide color gamut, high brightness, flexible screen size, long service life, energy saving and environmental protection. However, due to the small divergence angle of the laser beam and the characteristics of high coherence, the laser projection display will produce speckle effect and the problem of too small projection area. Speckle is mainly due to the coherent superposition of secondary waves scattered by the optical surface in the projection light path. As a kind of noise, it reduces the resolution of the image. The projected area is too small, mainly because the divergence angle of the laser is small. [0003] In order to reduce the speckle effect, the regular motion of the dynamic modulat...

AI Technical Summary

Problems solved by technology

First of all, the structure is relatively complicated, and it is necessary to inject a scattering medium into the waveguide and seal both ends of the waveguide, which increases the difficulty of manufacturing and the cost of use; secondly, maintenance is more troublesome. Once the waveguide is damaged, the scattering medium liquid encapsulated Leakage will cause damage to components such as circuits around the waveguide, increasing the risk of equipment damage and maintenance costs

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