Speckle eliminating device, laser light source and projection equipment

A speckle and laser technology, applied in the laser field, can solve the problems of laser speckle and affecting the imaging effect, etc.

Pending Publication Date: 2022-04-12
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a speckle elimination device, a laser light source and projection equipment, which solves the problem that laser speckles are prone to appear in the existing laser projection technology and affect the imaging effect

Method used

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  • Speckle eliminating device, laser light source and projection equipment
  • Speckle eliminating device, laser light source and projection equipment
  • Speckle eliminating device, laser light source and projection equipment

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Embodiment Construction

[0047] The terms used in the embodiments of the present application are only used to explain specific embodiments of the present application, and are not intended to limit the present application.

[0048]The high coherence of laser has always been one of the key points in the research of laser projection technology. Since the laser monochromaticity emitted by the laser is very good, that is, the frequency difference Δυ of the laser is very small, which is much smaller than the Δυ of ordinary light. Therefore, the laser’s The coherence time Δt is very large, which makes the time coherence of the laser higher.

[0049] When laser coherent light is reflected from a rough surface or backscattered or transmitted from the inside of a medium containing scattering substances, an irregular intensity distribution will be formed, and randomly distributed spots will appear. Scatterers in rough surfaces and media can be regarded as composed of a large number of irregularly distributed sur...

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Abstract

The embodiment of the invention provides a speckle eliminating device, a laser light source and projection equipment, the speckle eliminating device comprises at least one prism group, each prism group comprises a plurality of sub-prisms which are arranged in parallel, the plurality of sub-prisms can disperse a beam of incident laser into a plurality of beams of emergent laser, and the plurality of sub-prisms are arranged in parallel. And the optical path difference of the multiple beams of emergent laser is greater than the coherence length of the laser, that is, one beam of laser is divided into multiple beams of laser, the optical paths or optical paths of the multiple beams of laser are different, and when the optical path difference of the different paths of the multiple beams of laser is greater than the coherence length of the laser, the lasers of different paths cannot be coherent, so that the coherence of the laser is weakened, and the coherence of the laser is reduced. The laser speckles in the image are eliminated, and the imaging display effect is effectively improved.

Description

technical field [0001] The present application relates to the field of laser technology, in particular to a speckle elimination device, a laser light source and projection equipment. Background technique [0002] In recent years, laser display technology has been widely used in various occasions due to its advantages of high brightness, wide color gamut, high color reproduction, long life, energy saving and environmental protection. Among them, the development of laser projection display technology is becoming more and more subject to external scrutiny. [0003] At present, laser projection technology usually uses red, blue and green diode lasers as light sources, and also includes lighting systems and optical modulation chips. (such as digital micromirror device DMD, reflective projection panel LCOS, etc.), and then imaged on the image plane through the projection lens. [0004] However, due to the high coherence of laser light, when the coherent light source is reflected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/48G02B27/14G03B21/20
Inventor 谢振霖杨乐宝林大宾
Owner HUAWEI TECH CO LTD
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