Optical structure, system and method for eliminating laser projection speckles

An optical structure, laser projection technology, applied in optics, optical components, instruments, etc., can solve the problems of weakening, reduction of laser beam energy efficiency, brightness reduction, etc., to achieve the effect of maintaining energy efficiency, simple structure, and easy implementation

Inactive Publication Date: 2017-05-31
NIO CO LTD
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Problems solved by technology

The current solution to eliminate speckle by increasing spatial differences is mainly achieved by arranging a vibrating or rotating scatterer or diffractive optical element in the optical path, but the principle of eliminating speckle due to this solution is: scatterer Or the diffractive optical element expands the exit angle of the laser beam. With the increase of the exit angle, the brightness and contrast of the speckle and other parameters that reflect the energy of the beam will decrease to a considerable extent. The speckle received by the sensor phenomenon will be weakened
[0004] That is to say, the current solution to eliminate speckle will be accompanied by a reduction in the energy efficiency of the laser beam while eliminating speckle

Method used

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  • Optical structure, system and method for eliminating laser projection speckles

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Embodiment 1

[0032] Under the premise that the energy of the laser beam itself cannot match the lighting source, the present invention is based on the principle of eliminating speckle in the current laser speckle elimination technology "scattering body or diffractive optical element expands the exit angle of the laser beam, with the As the exit angle increases, the brightness and contrast of the speckle and other parameters that reflect the energy of the beam will decrease to a considerable extent, and the speckle phenomenon received by the sensor will be weakened accordingly. At the same time, it will be accompanied by the reduction of the energy efficiency of the laser beam." By introducing a rotating light mixing rod, after multiple total reflections inside the light mixing rod, the emitted laser light is shaped and projected. After expanding or converging the incident laser beam through multiple lens groups, it is finally projected on the display terminal.

[0033] Compared with the ex...

Embodiment 2

[0041] The present invention also provides an optical method for eliminating laser projection speckles, which mainly uses the optical system in Embodiment 1 to eliminate the speckle phenomenon existing in laser beams. The method mainly includes the following steps:

[0042] S10. Make three groups of parallel laser beams (first laser beams) emitted by (red, green, blue) three-primary color laser groups (L1, L2, L3) pass through the lens groups (M1, M2, M3) respectively to converge the beams to form Three sets of second laser beams.

[0043] S20. The three sets of second laser beams are respectively incident on the rotatable light mixing rod group (Lp1, Lp2, Lp3), and after multiple times of total reflection in the light mixing rod group (Lp1, Lp2, Lp3), a secondary light mixing rod group is formed. Three groups of third laser beams emitted by rods (Lp1, Lp2, Lp3). Due to the nature of the mixing rod and its rotation, spatial differentiation of the laser beam is achieved.

[...

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Abstract

The invention relates to micro laser projection display technologies, particularly provides an optical structure, system and method for eliminating laser projection speckles, and aims at overcoming the defect that the energy efficiency is reduced when the spatial differences are increased to eliminate the speckle phenomenon in current micro laser projection display technologies. The optical structure includes a laser light source, a light mixing stick, a digital micro-mirror device and a DMD array, laser beams emitted by the laser light source is subjected to multiple total reflection in the light mixing stick, emergent lights formed by the multiple total reflection are incident on the digital micro-mirror device which is loaded with digital holography source information, and laser beams emitted from the digital micro-mirror device go through the DMD array and reach a display terminal. On the premise of effectively eliminating the speckle phenomenon, the optical structure, system and method solve the contradiction between speckle elimination and energy efficiency in the current laser projection display technologies. Meanwhile, the optical structure, system and method have the advantages of being simple in structure and easy to implement.

Description

technical field [0001] The invention relates to micro-laser projection display technology, in particular to an optical structure, an optical system and an optical method for eliminating laser projection speckles. Background technique [0002] The micro-laser projection display technology mainly uses the laser beam of the three primary colors of red, green and blue as the light source, so that the picture (ie image) transmitted from the display terminal can restore the color of the objective world as truly as possible. The laser beam can make the image brightness of the display terminal higher and the color gamut wider, but the speckle phenomenon not only affects the resolution of the image, but also makes the appearance of the image modulated by the granular structure of the speckle field, which seriously affects the Image quality must therefore be suppressed. [0003] For micro-laser projection display technology, the monochromaticity and linear polarization of laser beams...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G03B21/00G02B27/48
CPCG02B27/48G03B21/008G03B21/2013G03B21/2033G03B21/208
Inventor 程长河
Owner NIO CO LTD
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