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Speckle-free three primary color laser light source and laser projection system

A technology of laser light source and three primary colors, which is applied in the field of projection display, can solve problems such as image blurring, achieve the effect of improving imaging quality, significantly reducing speckle effect, and reducing laser speckle contrast

Active Publication Date: 2017-01-04
HUBEI JIUZHIYANG INFRARED SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a speckle-free three-primary-color laser light source, through the structure of a special rotating diffuser, it can effectively target the most sensitive green light of the human eye, and solve the problem of image blur caused by the laser speckle effect

Method used

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  • Speckle-free three primary color laser light source and laser projection system
  • Speckle-free three primary color laser light source and laser projection system
  • Speckle-free three primary color laser light source and laser projection system

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 Shown is a basic embodiment of the speckle-free tri-color laser light source of the present invention.

[0038] It includes a red laser module 1, a green laser module 2 and a blue laser module 3, which are used to emit lasers of three primary colors that meet brightness requirements.

[0039] The red laser module 1, the green laser module 2 and the blue laser module 3 can be a single laser or a laser array composed of multiple lasers; the lasers can be semiconductor lasers, solid-state lasers or fiber lasers.

[0040] For laser arrays, trapezoidal mirrors can be used for beam shaping to compress the etendue, and then converged and coupled into optical fibers through lenses. Such as figure 2 The typical mode of the fiber-coupled laser module is shown. The laser array is composed of multiple identical lasers LD (for example, a 2×4 or 3×4 array structure). The mirror M1 compresses the beam aperture, and then couples it to the fiber F1 through the conve...

Embodiment 2

[0046] The difference from Example 1 is that the laser module 1 is blue, and the laser modules 2 and 3 are red and green. At the same time, the surface a of the scattering sheet 7 is coated with a dichroic film, so that the blue laser can be transmitted when it is incident, and the red and green laser can be transmitted. Reflection occurs, and the surface b of the scattering sheet 7 is also coated with an anti-reflection film.

Embodiment 3

[0048] Such as image 3 Shown is another basic embodiment of the speckle-free three-primary-color laser light source of the present invention. Including: red laser module 1, green laser module 2, blue laser module 3, energy transmission fiber 4, collimating lens 21, converging lens 22, scattering sheet 23, motor shaft 24 and rectangular integrating rod 25.

[0049] The red laser module 1, the green laser module 2 and the blue laser module 3 are used to emit lasers of three primary colors that meet brightness requirements. The red, green and blue laser modules 1, 2, and 3 can be a single laser or a laser array composed of multiple lasers. The laser can be a semiconductor laser, a solid state laser or a fiber laser. For laser arrays, trapezoidal mirrors can be used for beam shaping to compress the etendue, and then converged and coupled into optical fibers through lenses.

[0050] It also includes an energy transmission fiber 4, which uses a step-refractive index fiber to trans...

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Abstract

The invention discloses a speckle-free three primary color laser light source. The light source includes an infrared laser module, a green laser module, a blue laser module, a power transmitting fiber; a collimating lens, one diffuser which is spun by a motor; one converging lens which is intended for converging multiple beams of laser rays; and one rectangular optical integrator which is intended for outputting even rectangular speckles. The invention also discloses a laser projection system. According to the invention, the method for eliminating laser speckles emphasizes on conducting speckle elimination on green laser that is sensitive to human eyes, and has visible effects. The speckle-free laser light source, by adopting three primary colors special optical fiber coupling and clustering power synthesis technology, realizes high-brightness small optical expansion and even laser output. The laser projection system adopts the speckle-free laser light source of the invention, can effectively reduce the laser speckle contrast ratio of a projection picture, and increases the quality of the projected display image.

Description

technical field [0001] The invention belongs to the technical field of projection display, and in particular relates to a speckle-free three-primary-color laser light source and a laser projection system using the light source. Background technique [0002] Laser display technology is the fourth-generation display technology after black and white display, color display and digital display. It combines the characteristics of traditional projection display equipment and laser technology. It has high brightness, wide color gamut, high color reproduction, long life and energy saving. Environmental protection and other characteristics. In recent years, laser light sources have attracted more and more attention in the field of projection display technology. [0003] However, due to the high coherence of lasers, the lasers projected onto the screen interfere with each other to produce bright and dark speckles, which is a common speckle phenomenon in laser displays. Speckles will c...

Claims

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Application Information

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IPC IPC(8): G02B27/48G03B21/20
CPCG02B27/48G03B21/206G03B21/208
Inventor 向康刘在洲郭良贤郑家凤郭磊李海速王源
Owner HUBEI JIUZHIYANG INFRARED SYST CO LTD
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