Laser source and projection display device

A laser light source and laser technology, applied in the field of projection display, can solve the problems of image quality reduction, weakening speckle effect, etc., and achieve the effect of destroying coherence and weakening speckle effect

Active Publication Date: 2015-12-02
HISENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a laser light source and a projection display device. A fixed diffusion sheet and a rotating diffusion sheet are arranged in the optical path of the laser light source to jointly dissipate the laser speckle, effectively weaken the speckle effect, and solve the problems in the prior art. Technical issues with reduced image quality due to the speckle effect caused by the use of laser light sources

Method used

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  • Laser source and projection display device

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Embodiment 1

[0034] Embodiments of the present invention provide a laser light source, such as figure 1 As shown, it includes a laser 1, a fluorescent wheel 4, and a color filter wheel 7. The first diffusion sheet 3 is fixedly arranged in the optical path before the laser light enters the fluorescent wheel 4, so that the laser light emitted by the laser 1 passes through the first diffusion sheet before reaching the fluorescent wheel 4, and the fluorescence emitted by the laser and the laser excitation fluorescent wheel is combined. The light forms white light and passes through the second diffuser 6 before being output through the 7 color filters, and the second diffuser 6 is controlled to rotate.

[0035] Specifically, the laser 1 is a blue laser, and may be one or more arrays. In order to form white light, a wavelength conversion device is also required to generate light of other wavelengths or colors. In the embodiment of the present invention, the fluorescent wheel is used as a wavele...

Embodiment 2

[0053] The laser in Embodiment 2 of the present invention is a two-color laser that emits blue laser and red laser, wherein the blue laser and the red laser share a speckle dissipation system composed of a fixed diffuser and a moving diffuser, which can simultaneously weaken the blue laser. The speckle effect of the red and red lasers can be achieved to achieve the speckle elimination effect of the laser light source.

[0054] Specifically, such as Figure 6 As shown, the blue laser array 11 for outputting blue laser and the red laser array 12 for outputting red laser are vertically arranged, and the beams emitted by the vertically arranged arrays are also perpendicular to each other. Both laser arrays have gaps at the included corners.

[0055] The laser light emitted by the laser also needs to pass through a beam shaping device to further reduce its divergence angle, shrink the beam, and form a uniformly distributed laser spot before it can be used for illumination.

[005...

Embodiment 3

[0083] An embodiment of the present invention provides a projection display device, such as Figure 8 As shown in the schematic diagram, the projection display device includes a laser light source 1 , and also includes an optical engine 2 , a lens 3 and a projection screen 4 .

[0084]The laser light source adopts the laser light source in the above-mentioned embodiment 1 or 2. The light sources are mixed to form white light and sequentially output the three primary color lights. The primary color light enters the second part of the optical machine through the light rod (not shown in the figure), except for the light rod structure , the optical machine 2 part also includes an optical path conversion device and a DMD chip (both not shown in the figure). The DMD chip can be regarded as composed of extremely many tiny mirrors. These micro mirrors can be turned over within a certain angle range under the current drive to adjust the amount of light entering the lens, so that differ...

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Abstract

The invention discloses a laser source comprising a laser device, a fluorescent wheel, a color filter wheel. The fluorescent wheel is excited by laser to emit fluorescence. The laser emitted from the laser device passes through a first diffusion slice before reaching the fluorescent wheel. The first diffusion slice is fixedly arranged. After being combined, the laser and the fluorescence pass through a second diffusion slice before being subjected to color filtering of the color filter wheel. The second diffusion slice is controlled to rotate. The cooperation of the first diffusion slice and the second diffusion slice effectively increases the spatial random phase of the laser, forms multiple independent speckle patterns, effectively weakens a speckle effect, and improves projection image display quality.

Description

technical field [0001] The invention relates to the field of projection display, in particular to a laser light source and a projection display device. Background technique [0002] Laser is a light source with high brightness, strong directionality, and monochromatic coherent light beam. Due to its many advantages, it has been gradually used as a light source in the field of projection display technology in recent years. However, due to the high coherence of laser, speckle effect is inevitable. This phenomenon is not only obvious in the scheme using pure laser as light source, but also exists in the scheme of mixed light source of laser and fluorescent light, as well as laser and LED. The so-called speckle means that when a coherent light source irradiates a rough object, the scattered light will interfere in space because of the same wavelength and constant phase. The final result is that there are granular light and dark spots on the screen, that is, some unfocused spots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G03B21/14
CPCG02B5/0263G02B5/0278G02B26/008G02B27/48G03B33/08H04N9/3114H04N9/3161H04N9/3158G03B21/2013G03B21/204G03B21/2066G03B21/208H04N9/3164
Inventor 田有良刘显荣李巍
Owner HISENSE
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