CN202083837U

CN202083837U - Laser projection display system

Info

Publication number: CN202083837U
Application number: CN2010205944100U
Authority: CN
Inventors: 郑荣升; 张涛
Original assignee: AVIC Huadong Photoelectric Co Ltd
Current assignee: AVIC Huadong Photoelectric Co Ltd
Priority date: 2010-11-03
Filing date: 2010-11-03
Publication date: 2011-12-21
Anticipated expiration: 2020-11-03

Abstract

The utility model discloses a laser projection display system which comprises a laser source; a beam expanding, shaping and homogenizing device, a space modulator, a projection lens and an optical fiber display screen are sequentially arranged on an optical path in front of the laser source; the beam expanding, shaping and homogenizing device is a double-convex micro lens array comprising two flat-convex cylindrical lenses which are glued; the two flax-convex cylindrical lenses are arranged orthometrically; and the plane parts of the two flax-convex cylindrical lenses are over against each other and are glued together. The laser projection display system reduces the speckle effect in layer display and the coherence of the laser, and simultaneously avoids the secondary speckle effect produced by the irradiation to a diffuse surface; and in addition, due to the flexibility of optical fibers, the projection display system can realize the ultra-thin display of a large screen.

Description

Laser light projection display system

Technical field

The utility model relates to a kind of laser projection system, comprises laser projection system and optical fiber display screen specifically, belongs to laser projection display technology field.

Background technology

What the tradition projection display apparatus generally used is light sources such as metal halid lamp, UHE bulb, UHP bulb.These light sources are owing to its intrinsic luminescence mechanism, and its life-span has only several thousand hours usually, contains ultraviolet (UV) and infrared (IR) light in the radiation spectrum, therefore need ultraviolet and infrared fileter, increase the complicacy of light path system design.Adopt led light source replace traditional bulbs light source in recent years, be used for projection display system, have long service life, volume is little, response speed is fast, advantages such as no ultraviolet or infrared radiation.Yet,, seeming not enough aspect high brightness, the large screen display because it belongs to lambert's illuminating source, influenced the application space of LED on projection display technique greatly, in addition, the LED wavelength is generally tens nanometers, still can't fully truly reduce the color of place on color gamut space.

Adopt laser to have a lot of advantages as the light source of optical projection system: laser monochromaticity is good, be line spectrum, very high saturation degree is arranged, its colour gamut coverage rate can reach human eye can discern more than 90% of color space, be more than 2 times of NTSC standard, break through the deficiency of existing display technique color gamut space, realize real more color rendition.Because the wavelength of laser beam is fixed, thereby looks more comfortable, does not have the dazzling uncomfortable sensation of the sort of bulb.The more important thing is there is not the ultraviolet ray of conventional light source, make and loosen very much when eyes are seen picture.The electro-optical efficiency height of while laser, good directionality is easy to realize that high-brightness projection shows.The laser emitting light beam is generally linearly polarized light, for optical projection system based on miniature Liquiid crystal on silicon (lcos) display (LOCS) or LCDs (LCD) photomodulator, polarized light source will reduce the use of polaroid quantity, increase light transmission rate, reduce the complicacy of light path system design, improve the brightness of laser display.In addition, laser display technology also has contrast height, life-span length, environmental protection, advantage such as energy-conservation, and will become of future generation the demonstration is the main flow display technique in panchromatic demonstration epoch.

Because the coherence of laser makes when beam of laser shines the rough surface with diffusive property, spot has appearred in the screen display, i.e. laser speckle, and this has influenced the sharpness that activity video reproduces greatly, address this problem, must make optics and screen system become complicated.Want eliminate laser speckle, its essence is the room and time coherence who reduces laser.Method commonly used at present is the coherence who adopts space bit phase modulation technique to reduce laser, by components and parts or the display screen in the periodic vibration Laser Transmission path, utilize temporal average effect, reduce laser speckle effect, improve the sharpness of image.Application number is 200510115472.2 Chinese patent employing diffraction optical element, and the laser beam that is used for sending from lasing light emitter is divided into a plurality of beamlets, and periodically motion, with the speckle time average with laser beam.Application number is that 200820108219.3 Chinese patent drives laser projection device by vibrating device and vibrates, and makes the image that is produced on the projection screen change fast, utilizes vision to stop the purpose that reaches the minimizing speckle.Application number is 200910110896.8 Chinese patent employing voltage modulation signal control PZT modulator element, variation by the PZT element comes the fast moving lenticule, the incident angle of the optical fiber by entering multimode optical fiber behind the lenticule is changed fast, thereby make shoot laser produce the unordered of polarization and position phase, reduce the coherence of light source, reach the purpose that reduces speckle.

The utility model content

The purpose of this utility model provides a kind of laser light projection display system, overcomes the defective of prior art, realizes giant-screen, the clear demonstration of high brightness, improves the reliability and the serviceable life of system, and reduces system noise.

The technical solution of the utility model is as follows:

A kind of laser light projection display system includes LASER Light Source, it is characterized in that: be provided with successively on the place ahead light path of described LASER Light Source and expand bundle, shaping and homogenize device, spatial modulator, projecting lens and optical fibre display screen; The biconvex microlens array that described expansion bundle, shaping and homogenize device are set up jointly by two planoconvex post lens glues, described two planoconvex post lens quadratures are placed, and the planar section of described two planoconvex post lens is relative and glued together.

Described laser light projection display system is characterized in that: described spatial modulator is LCD, LCOS or digital micro-mirror display screen (DMD).

Described laser light projection display system, it is characterized in that: the input of described optical fibre display screen, to go out end be respectively the fiber array that is formed by the multimode optical fiber dense arrangement, the end face of each root multimode fiber is a pixel, and the pixel of described optical fibre display screen output terminal is corresponding one by one with the pixel of optical fibre display screen input end.

Described laser light projection display system is characterized in that: described several multimode optical fibers are silica fibre and plastic optical fiber.

Described LASER Light Source shines on the spatial modulator after expanding bundle, shaping and homogenize conversion, and image is carried on the spatial modulator, projects the input end face of optical fibre display screen by projecting lens, is transferred to output terminal by multimode optical fiber again and shows.Described shaping transformation device is a pair of plano-convex cylindrical lens raster, by two cylindrical lens raster are positioned in the plane of vertical optical axis, makes their cylindrical lens unit orthogonally oriented, and two planes are glued together relatively, form lenticular microlens array.Described spatial modulator can be LCD, LCOS or DMD.The input end of described optical fibre display screen is closely arranged by the array multimode optical fiber, and the end face of an optical fiber is a pixel, and output terminal is fixed on a side of a transparency carrier by displaying ratio.Multimode fiber array is cut apart the laser beam that projects on its input end face, and the optical fiber of each pixel transfers to output end face via different multimode optical fibers, has reduced the coherence of laser, thereby has reduced laser speckle effect.

The beneficial effects of the utility model:

The mode that the utility model adopts Color Laser Projection Technology to combine with optical fibre display screen reduces the speckle effect in the laser display, by multimode fiber array transmission and demonstration laser image, at input end laser beam is cut apart, the beamlet that is coupled into each root optical fiber is again because the difference of incident angle, the different light path of process in optical fiber, make the coherence who has reduced laser at exit end, reduced speckle effect, utilize fiber end face directly as the pixel that shows simultaneously, avoided shining the secondary speckle effect that diffuse reflection surface produces; In addition because the pliability of optical fiber makes this type of projection display system can realize the ultra-thin demonstration of giant-screen.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is for expanding the structural representation of bundle, shaping and homogenize device.

Fig. 3 is the structural representation of optical fibre display screen output terminal.

Embodiment

Referring to Fig. 1,2,3, a kind of laser light projection display system includes LASER Light Source 1, is provided with successively on the place ahead light path of LASER Light Source 1 to expand bundle, shaping and homogenize device 2, spatial modulator 3, projecting lens 4 and optical fibre display screen 5; Expand the biconvex microlens array that bundle, shaping and homogenize device 2 are made up of two planoconvex post lens, 6,7 gummeds, two planoconvex post lens 6,7 quadratures are placed, and the planar section of two planoconvex post lens 6,7 is relative and glued together.

Spatial modulator 3 is LCD, LCOS or DMD.

The input of optical fibre display screen 5, go out end and have the fiber array that forms by several multimode optical fiber 8 dense arrangement respectively, the end face of each root multimode fiber is a pixel, and the pixel of optical fibre display screen 5 output terminals is corresponding one by one with the pixel of optical fibre display screen 5 input ends; Several multimode optical fibers 8 are silica fibre and plastic optical fiber.

Set forth embodiment of the present utility model below with reference to accompanying drawing:

Referring to Fig. 1, the laser beam that LASER Light Source 1 is sent (is generally circle or oval hot spot, and light distribution is inhomogeneous, be generally Gaussian distribution) after expanding bundle, incide expansion bundle, shaping and homogenize device 2 and be transformed into the equally distributed rectangular light beam of intensity, shine the spatial modulator 3 of rectangle, image is carried on the spatial modulator, project the incident end of optical fibre display screen 5 by projecting lens 4, transfer to exit end through multimode fiber array again and show.Multimode fiber array is cut apart the laser beam that projects on its input end face, and the optical fiber of each pixel transfers to output end face via different multimode optical fibers, has reduced the coherence of laser, has reduced laser speckle effect.

Referring to Fig. 2, expand bundle, shaping and homogenize device 2 and form by a pair of cylindrical lens quadrature placement gummed.During enforcement, two cylindrical lenses can be cut into square, make its two plane staggered relatively, and their cylindrical lens unit orientation perpendicular array.Formed grid cell can be regarded the lenticular two-dimensional lens array of n * n as, realizes that the homogenising of laser beam being carried out changing and shaping and light beam distributes.

Referring to Fig. 3, the output terminal of fiber array is fixed on a side of transparency carrier, and the ranks spacing is according to image enlargement factor and the decision of employed number of fibers.

Top embodiment is the laser projection illuminator of monolithic, in three laser projection system, red, green, blue tricolor laser device is right by orthogonal grating respectively, project on three photomodulators, after ECDC look device closes look, form the projection image source, project on the optical fibre display screen by projecting lens.When multimode optical fiber is plastic optical fiber, utilize the good advantage of its pliability, can realize that ultra-thin large-screen, high brightness, high definition show, are applied in public places such as square, shop, station, harbour.

Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that under the situation that does not break away from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is limited by claims and equivalent thereof.

Claims

1. a laser light projection display system includes LASER Light Source, it is characterized in that: be provided with successively on the place ahead light path of described LASER Light Source and expand bundle, shaping and homogenize device, spatial modulator, projecting lens and optical fibre display screen; The biconvex microlens array that described expansion bundle, shaping and homogenize device are set up jointly by two planoconvex post lens glues, described two planoconvex post lens quadratures are placed, and the planar section of described two planoconvex post lens is relative and glued together.

2. laser light projection display system according to claim 1, it is characterized in that: the input of described optical fibre display screen, output terminal are the arrays that is formed by the multimode optical fiber dense arrangement, the end face of each root multimode fiber is a pixel, and the pixel of described optical fibre display screen output terminal is corresponding one by one with the pixel of optical fibre display screen input end.

3. laser light projection display system according to claim 2 is characterized in that: described multimode optical fiber is silica fibre and plastic optical fiber.