CN102096293B - Optical engine for three-piece liquid crystal on silicon (LCOS) laser projection display - Google Patents
Optical engine for three-piece liquid crystal on silicon (LCOS) laser projection display Download PDFInfo
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- CN102096293B CN102096293B CN2011100327664A CN201110032766A CN102096293B CN 102096293 B CN102096293 B CN 102096293B CN 2011100327664 A CN2011100327664 A CN 2011100327664A CN 201110032766 A CN201110032766 A CN 201110032766A CN 102096293 B CN102096293 B CN 102096293B
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Abstract
The invention relates to an optical engine for laser projection display of a three-piece liquid crystal on silicon (LCOS). The optical engine comprises a red laser, a green laser, a blue laser, three dodging and reshaping systems, an optical core, a three-piece LCOS, a reflecting mirror and a projection objective, wherein the luminescence centers of the three lasers are positioned on the main optical axes of corresponding dodging and reshaping systems; the three optical axes of corresponding dodging and reshaping systems are parallel with one another; three light beams emitted by the three lasers are adjusted into uniform rectangular parallel light beams by the dodging and reshaping systems respectively; two beams of light directly enter corresponding polarization beam splitters, and the other beam of light is reflected by the reflecting mirror and enters a corresponding polarization beam splitter; and polarized light in three colors is finally combined into white light and enters the projection objective by the optical core. The lasers are taken as light sources, generated laser light is small-bandwidth linear polarized light, and a color filter is not used, so that a large number of polaroids are eliminated, cost is lowered, and the utilization ratio of optical energy is increased simultaneously; and the color gamut range, color brightness degree and color fidelity degree of the optical engine are better than those of the optical engine of the conventional optical system.
Description
Technical field
The present invention relates to a kind of three-sheet type LCOS laser projection demonstration and use light engine, belong to the laser display technology field.
Background technology
Projection display technique through decades development, progressively move to maturity, and be widely used.At present projection display technique mainly is divided into four types of CRT, LCD, DLP, LCOS.CRT projection display technique development time is the longest, and technology is the most ripe, but because its brightness is low, display size is limited, volume is big, heavy, adjustment is complicated and show that for a long time still frame can make cathode-ray tube (CRT) generation shortcoming such as burn, seldom use at present; The LCD projection display technique develops over past ten years very rapidly, and it has, and volume is little, in light weight, simple to operate, low cost and other advantages, but it exists shortcomings such as light utilization efficiency is low, the pixel sense is strong; The DLP projection display technique is present unique digital shadow casting technique, and its image device is DMD, and it has the efficiency of light energy utilization than advantage such as higher, that response speed fast, brightness and look good uniformity, volume are little, in light weight; The LCOS projection display technique has then combined the advantage of LCD and two kinds of projection display techniques of DLP, has following advantage: (1) resolution is high, image is fine and smooth; (2) aperture opening ratio is high, the efficiency of light energy utilization is high, brightness is high; (3) contrast is higher than LCD, can reach 2000:1; (4) the direct reflected light of the same ability with the DLP panel and make panel be difficult for being burnt; (5) no ghost phenomena.
Which kind of projection display technique no matter, light source all is to guarantee that its color is true to nature, the key that image color is abundant.On the chromatic diagram of International Commission on Illumination (CIE) issue in 1931; Laser display colour triangle area is more than 2 times of traditional C RT colour triangle area; This gamut range that just means the laser projection demonstration is broader, and the color that is shown is more true to nature.In addition, laser display and tradition show to be compared, and also has following advantage: 1. because the spectrum of laser is line spectrum, so the excitation of laser, saturation degree are all very high; 2. compare with common display, at same size, under the identical display effect condition, the luminous energy of laser display loss is lower; 3. laser display at room temperature the life-span can reach more than 100,000 hours, its life-span is long, reliability is high; 4. laser display is easy to realize the large scale screen.
In sum, based on the laser projection display technology of LCOS, be the developing direction and the inexorable trend of following projection display technique.In theory, in traditional Projection Display colour mixture mechanism, no matter be based on the spacing color mixed technology of three-sheet type LCOS; Also being based on one chip LCOS utilizes the motor drive colour wheel of high speed rotating to realize time colour mixture technology; All there is 67% luminous energy to be wasted, so, seek a kind of new colour mixture mechanism based on the LCOS projection display technique; Reducing the luminous energy waste as far as possible, is the current top priority in projection display technique field.
The patent No. is that the Chinese patent " LCOS optical engine system " of ZL200720310464.8 discloses a kind of LCOS optical engine system, and this system comprises UHP light source, optical wand, relay lens group, dichronic mirror, catoptron, the preparatory polarizer, polarization spectroscope (PBS), LCOS chip, X type light-combining prism and projection lens; Close photosystem and adopt light nuclear, PBS prism and the color-combination prism established in the light nuclear are bonded as one, and the outside of the R that examines at light, G, three PBS prisms of B is respectively equipped with the LCOS chip; Though this system has realized the colour of image and has shown; But the mission life of its UHP light source is short, and colour filter reduces the utilization factor of luminous energy, and the display system colour gamut is narrow; System radiating is complicated, and reliability and stability are poor.The patent No. is 200710042362.7 Chinese patent " sheet type LCOS projection machine optical engine of three of three-color LED illumination ", replaces going up the UHP light source in the patent with red, green and blue three-color LED light source; Replace going up the color separation illuminator in the patent with the identical illuminator of three structures red, green and blue three color light.This system has realized that also the colour of image shows, but because led light source is the area source that multiple spot is formed, used device was many when this just required the identical illuminator of its three structures to put light beam in order, and structure is more complicated also.
Summary of the invention
The objective of the invention is to propose a kind of laser lighting, the simple three-sheet type LCOS Projection Display of light channel structure is used light engine.
For realizing above-mentioned purpose; Three-sheet type LCOS laser projection of the present invention shows uses light engine; Comprise light source, projection objective, by three polarization splitting prisms and an X type light-combining prism and be located at the light that the LCOS in three polarization splitting prisms outsides forms respectively and examine; The light beam that said light source sends is injected projection objective through light nuclear; Said light source is the red, green, blue laser instrument; Be provided with the identical even polishing shape system that is used for corresponding laser instrument emitted laser bundle is adjusted into even rectangle parallel beam of three optical textures between this three looks laser instrument and the light nuclear, the luminescent center of said three laser instruments is positioned on the primary optical axis of corresponding even polishing shape system, and the primary optical axis of three even polishing shape systems is parallel to each other; After three light beams that three laser instruments send are adjusted into the suitable even rectangle parallel beam of size through even polishing shape system respectively; Wherein two-beam is directly injected corresponding polarization splitting prism; Another Shu Guang is through getting into corresponding polarization splitting prism after the reflection of catoptron; Three chromatic polarization light from three polarization splitting prism outgoing synthesize white light through X type light-combining prism respectively, get into projection objective, realize the panchromatic demonstration of laser.
Further, said even polishing shape system comprise be used for the light beam that laser instrument sends become circular directional light the beam-expanding collimation subsystem, be used for circular directional light is become the beam shaping dissipation spot subsystem of uniform rectangle directional light and the conjugation of the spot that is used to the dissipate phaser that disappears.
Further, said beam-expanding collimation subsystem is made up of a biconcave lens and a biconvex lens, and the focus of biconvex lens overlaps with the virtual focus of biconcave lens.
Further; Said beam shaping dissipation spot subsystem comprises first, second fourier transform lens, miniature rotary electric machine, web joint, small angle scattering device and phase place diffraction type optical device; Said miniature rotary electric machine is fixedly arranged on the web joint; This web joint center is provided with the printing opacity aperture; Said first fourier transform lens, aperture, phase place diffraction type optical device and second fourier transform lens are located on the primary optical axis of even polishing shape system successively, and web joint is perpendicular to the primary optical axis of even polishing shape system, and said small angle scattering device is located on the miniature rotary electric machine near phase place diffraction type optical device.
Further, the scattering angle of said small angle scattering device is less than 1 degree.
Further, said catoptron is single wavelength deielectric-coating high reflection mirror, is used for reflect green light.
Further, be provided with 1/2nd wave plates between said red, blue light polarization splitting prism and the X type light-combining prism.
Further, said three laser instruments and three even polishing shape systems are located on the same plane side by side, and are positioned at the same side of LCOS projection optical system.
Three-sheet type LCOS laser projection demonstration of the present invention uses light engine to be light source with laser instrument, and the laser of generation is the narrower linearly polarized light of bandwidth, without color filter, has saved a large amount of polaroids, when reducing cost, has improved the efficiency of light energy utilization; Utilize the polarization characteristic of laser, need not to obtain polarized light, further improved the efficiency of light energy utilization again through polarizer; Use even polishing shape system can access comparison evenly, colour purity, the high illumination hot spot of brightness; Because narrow bandwidth, the wavelength-tunable of laser, this light engine all be better than the light engine of existing optical projection system far away, and system architecture is comparatively simple on the distinct degree of gamut range, color, colored degree true to nature.
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention;
Fig. 2 is a beam-expanding collimation subsystem synoptic diagram;
Fig. 3 is a beam shaping dissipation spot system schematic;
Fig. 4 is a phase place diffraction type optical device schematic diagram.
Embodiment
Three-sheet type LCOS laser projection of the present invention shows as shown in Figure 1 with light engine, comprises even polishing shape system, catoptron 13, ruddiness polarization splitting prism 14, green glow polarization splitting prism 15, blue light polarization splitting prism 16, red LCOS 17, green LCOS 18, blue LCOS 19, X type light-combining prism 20 and projection objective 21 that red laser 1, green laser 2, blue laser 3, three optical textures are identical.Wherein the wavelength of red laser is 635nm; The wavelength of green laser is 532 nm; The wavelength of blue laser is 447 nm; Catoptron is single wavelength deielectric-coating high reflection mirror, is used for reflect green light.Three polarizing beam splitter mirrors all are that the length of side is the block prism of 25.4mm, and it has had partially and the effect of analyzing simultaneously; X type light-combining prism is that the length of side is the block prism of 25.4mm, can three look laser be synthesized the standard white light; The size of three LCOS is 0.7 inch (16:9).
Red, green, blue polarization splitting prism and X type light-combining prism 20 and the red, green, blue LCOS that is located at the red, green, blue polarization splitting prism outside respectively form light nuclear, and each polarization splitting prism is provided with near X type light-combining prism; Be provided with 1/2nd wave plates between red, blue light polarization splitting prism and the X type light-combining prism.
Be provided with the identical even polishing shape system of three optical textures between three laser light sources of this light engine and the light nuclear; Be used for corresponding laser instrument emitted laser bundle is adjusted into even rectangle parallel beam; With three laser instruments is light source, and the luminescent center of three laser instruments is positioned on the primary optical axis of corresponding even polishing shape system, and the primary optical axis of three even polishing shape systems is parallel to each other; Three laser instruments and three even polishing shape systems are located on the same plane side by side, and are positioned at the same side of LCOS projection optical system.
Three even polishing shape systems include be used for the light beam that laser instrument sends become circular directional light the beam-expanding collimation subsystem, be used for circular directional light is become the beam shaping dissipation spot subsystem of uniform rectangle directional light and the conjugation of the spot that is used to the dissipate phaser that disappears, this conjugation phaser that disappears is a phase place diffraction type optical device.As shown in Figure 2, the beam-expanding collimation subsystem is made up of a biconcave lens and a biconvex lens, and the focus of biconvex lens overlaps with the virtual focus of biconcave lens.As shown in Figure 3; Beam shaping dissipation spot subsystem comprises first fourier transform lens 41, second fourier transform lens 47, miniature rotary electric machine 42, web joint 45, small angle scattering device 43 and phase place diffraction type optical device 44; Miniature rotary electric machine 42 is fixedly arranged on the web joint 42; This web joint center is provided with printing opacity aperture 46, the first fourier transform lenses 41, aperture 46, phase place diffraction type optical device 44 and second fourier transform lens 47 and is located at successively on the primary optical axis of even polishing shape system, and web joint 45 is perpendicular to the primary optical axis of even polishing shape system; Small angle scattering device 43 is located on the miniature rotary electric machine 42 near phase place diffraction type optical device part; Aperture 46 is positioned at light beam focusing place of beam-expanding collimation subsystem, makes luminous energy fully through aperture 46, and guarantees that web joint is perpendicular to optical axis.Phase type diffraction optical device 43 places after the small angle scattering device 44.Small angle scattering device high speed rotating for a long time under the drive of micromachine; Light beam through mechanical connection plate center pit can make the contrast of laser speckle weaken behind the rotation scatterer; Phase type diffraction beam shaping device can convert circular or oval Gauss or accurate Gaussian beam to uniform rectangle light beam, has so just reached the purpose of reduction laser speckle.The small angle scattering device is to be formed by the higher quartz material of threshold for resisting laser damage, and the device scattering angle is unsuitable excessive, and the scattering angle of scatterer of the present invention is less than 1 degree.
Phase place diffraction type optical device 52 should be close to fourier transform lens 51 and place; Laser beam is through inciding after the system of front on the fourier transform lens (or phase place diffraction type optical device); On the back focal plane of fourier transform lens, obtaining L is that needed hot spot distributes, as shown in Figure 4.Hot spot bulk on this frequency plane is by the focal length decision of fourier transform lens, and physical relationship is:
, wherein
fBe the focal length of lens,
Be angle of diffraction.So can be through the hot spot bulk on the focal length bi-directional scaling frequency plane of regulating fourier transform lens.
During use, red laser instrument 1, green laser 2, blue laser 3 send three beams of laser simultaneously; Three beams of laser is respectively through separately even polishing shape system: become circular directional light through beam-expanding collimation subsystem 4,5,6 earlier; After beam shaping dissipation spot subsystem 7,8,9 becomes uniform rectangle directional light; Again through conjugation phase place device 10,11,12 spot that dissipates once more that disappears, and make the beam cross-section size dimension be suitable for the even rectangle parallel beam of LCOS; Red and blue light beam directly gets into its corresponding polarization splitting prism 14,16; Green beam gets into green polarization splitting prism 15 after catoptron 13 reflections; Three polarization splitting prisms reflex to the polarized light of S attitude respectively on the LCOS17,18,19 respectively; Synchronous signal is handled drive system and also is loaded into red, green, blue trichromatic vision frequency signal respectively on the corresponding LCOS; Light wave after being modulated respectively by LCOS reflects, and more respectively through polarization splitting prism 15,16,17 analyzings, injects X type light-combining prism 20 respectively from the polarized light of the P attitude of three polarization splitting prism outgoing respectively; Three coloured light in that X type light-combining prism 20 places meet carry out the spatial domain colour mixture through X type light-combining prism 20, synthesize white light, and transmission gets into projection objective 21, realizes the panchromatic demonstration of laser.Light engine of the present invention can be used for family's rear-projection TV, or the large screen display of public places such as commerce is made trouble, station, harbour.
Claims (5)
1. light engine is used in a three-sheet type LCOS laser projection demonstration; Comprise light source, projection objective, by three polarization splitting prisms and an X type light-combining prism and be located at the light that the LCOS in three polarization splitting prisms outsides forms respectively and examine; The light beam that said light source sends is injected projection objective through light nuclear; It is characterized in that; Said light source is the red, green, blue laser instrument; Be provided with the identical even polishing shape system that is used for corresponding laser instrument emitted laser bundle is adjusted into even rectangle parallel beam of three optical textures between this three looks laser instrument and the light nuclear, the luminescent center of said three laser instruments is positioned on the primary optical axis of corresponding even polishing shape system, and the primary optical axis of three even polishing shape systems is parallel to each other; After three light beams that three laser instruments send are adjusted into the suitable even rectangle parallel beam of size through even polishing shape system respectively; Wherein two-beam is directly injected corresponding polarization splitting prism; Another Shu Guang is through getting into corresponding polarization splitting prism after the reflection of catoptron; Three chromatic polarization light from three polarization splitting prism outgoing synthesize white light through X type light-combining prism respectively, get into projection objective, realize the panchromatic demonstration of laser; Said even polishing shape system comprise be used for the light beam that laser instrument sends become circular directional light the beam-expanding collimation subsystem, be used for circular directional light is become the beam shaping dissipation spot subsystem of uniform rectangle directional light and the conjugation of the spot that is used to the dissipate phaser that disappears; Said beam-expanding collimation subsystem is made up of a biconcave lens and a biconvex lens, and the focus of biconvex lens overlaps with the virtual focus of biconcave lens; Said beam shaping dissipation spot subsystem comprises first, second fourier transform lens, miniature rotary electric machine, web joint, small angle scattering device and phase place diffraction type optical device; Said miniature rotary electric machine is fixedly arranged on the web joint; This web joint center is provided with the printing opacity aperture; Said first fourier transform lens, aperture, phase place diffraction type optical device and second fourier transform lens are located on the primary optical axis of even polishing shape system successively; Web joint is perpendicular to the primary optical axis of even polishing shape system, and said small angle scattering device is located on the miniature rotary electric machine near phase place diffraction type optical device.
2. three-sheet type LCOS laser projection according to claim 1 shows uses light engine, it is characterized in that: the scattering angle of said small angle scattering device is less than 1 degree.
3. three-sheet type LCOS laser projection according to claim 1 and 2 shows uses light engine, and it is characterized in that: said catoptron is single wavelength deielectric-coating high reflection mirror, is used for reflect green light.
4. three-sheet type LCOS laser projection according to claim 3 shows uses light engine, it is characterized in that: be provided with 1/2nd wave plates between said red, blue light polarization splitting prism and the X type light-combining prism.
5. three-sheet type LCOS laser projection according to claim 4 shows uses light engine, it is characterized in that: said three laser instruments and three even polishing shape systems are located on the same plane side by side, and are positioned at the same side of LCOS projection optical system.
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