Laser projection system based on flexible diffractive optical element

A diffractive optical element and laser projection technology, applied in optical elements, optical, electrical elements, etc., can solve the problems of large number of speckle suppression elements, poor stability, and low utilization of light energy, and achieve laser speckle elimination and stable High performance, high efficiency of light energy utilization

Pending Publication Date: 2020-06-23
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0009] In order to overcome the shortcomings of the existing laser projection system, such as low utilization rate of light energy, large number of speckle suppression elements, and

Method used

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  • Laser projection system based on flexible diffractive optical element
  • Laser projection system based on flexible diffractive optical element
  • Laser projection system based on flexible diffractive optical element

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] refer to Figure 1 to Figure 4 , a laser projection system based on flexible diffractive optical elements, including a laser 101 that emits laser light, a beam shaping element 102 that can shape the laser beam emitted from the laser to match the surface shape of the spatial light modulator, and is used to eliminate A flexible DOE ring 103 for laser speckle, a TIR prism 104, a spatial light modulator 105 for modulating laser light to generate image light, and a projection objective lens 106 for emitting the image light, the laser 101, beam shaping element 102, flexible DOE ring 103 , a TIR prism 104 , a spatial light modulator 105 and a projection lens 106 sequentially form an optical path, and the flexible DOE ring 103 is connected with a drive assembly for driving its crawler movement.

[0029] The laser 101 is a red, green and blue primary color laser, and th...

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Abstract

A laser projection system based on a flexible diffractive optical element comprises a laser emitting laser, a beam shaping element, a flexible DOE ring, a TIR prism, a spatial light modulator and a projection objective lens, wherein the beam shaping element can shape a laser beam emitted from the laser into a shape matched with the shape of a spatial light modulator, the flexible DOE ring is usedfor eliminating laser speckles, the spatial light modulator is used for modulating the laser to generate image light, and the projection objective lens is used for emitting the image light; and the laser, the light beam shaping element, the flexible DOE ring, the TIR prism, the spatial light modulator and the projection objective lens form a light path in sequence, and the flexible DOE ring is connected with a driving assembly used for driving the flexible DOE ring to move in a crawler-type mode. The invention provides the miniature, high-stability and high-efficiency laser projection system for suppressing speckles based on a flexible diffractive optical element.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a laser projection system for suppressing speckle based on a flexible diffractive optical element (DOE). Background technique [0002] Traditional projection systems using xenon lamps and high-pressure mercury lamps are heavy in weight, large in size, and high in heat production, and are increasingly unable to meet people's requirements for light and portable projectors, high brightness, rich colors, and ease of use. Therefore, people gradually turn their attention to Turn to laser projection. [0003] Laser is a light source with high brightness and wide color gamut, which has the advantages of long life, energy saving and environmental protection. Applying the laser to the projector can not only make the projector smaller, but also reproduce the rich and bright colors of the objective world most realistically, providing more shocking expressiveness. [0004] But at the ...

Claims

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Application Information

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IPC IPC(8): G03B21/20G02B27/48G03B21/00H04N9/31
CPCG02B27/48G03B21/008G03B21/2013G03B21/2033G03B21/208H04N9/3102H04N9/3152H04N9/3161
Inventor 乐孜纯李加坡
Owner ZHEJIANG UNIV OF TECH
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