CN100373214C

CN100373214C - Projection display optical system and projector having the same

Info

Publication number: CN100373214C
Application number: CNB2004101033085A
Authority: CN
Inventors: 林志贤
Original assignee: Asia Optical Co Inc
Current assignee: Asia Optical Co Inc
Priority date: 2004-12-15
Filing date: 2004-12-15
Publication date: 2008-03-05
Anticipated expiration: 2024-12-15
Also published as: CN1790097A

Abstract

The present invention discloses a projection display optical system which is suitable for a reflecting type display element. The present invention comprises a light source which can generate irradiation light beams, a color wheel, a reflector and a projecting lens, wherein the color wheel is provided with a plurality of light filtering blocks, and each of the light filtering blocks can make colorific light beams of a needed wave band pass in a selected mode and make the colorific light beams of other wave bands reflected; the reflector and the color wheel can form a light reflecting passage. When the irradiation light beams enter the color wheel at a fixed incidence angle and are reflected for many times by the light reflecting passage between the color wheel and the reflector, the colorific light beams which have a plurality of different wave bands and travel in different optical paths can be generated and are irradiated on the reflecting type display element, so that the reflecting type display element can be divided into a plurality of color block images; then, the color block images are projected to a screen through a projecting lens; finally, the rotational speed of the color wheel and the reflecting type display element can be controlled through a control unit so as to form a projecting device which can project dynamic color images.

Description

Projection Display optical system and projection arrangement with this optical system

[technical field]

The present invention relates to a kind of Projection Display optical system, refer to especially a kind ofly be applicable to reflective display element and be used for improving the Projection Display optical system of light utilization efficiency and projection arrangement with this optical system.

[background technology]

Relevant back projection Study on Technology is one of technology focus that shows now in the field, the main display technique that is applied to back projection at present has LCD (Liquid Crystal Display, liquid crystal display), DLP (DigitalLight Processing, digital light is handled) and LCoS (Liquid Crystal on Silicon, liquid crystal on silicon shows), wherein the advantage of LCoS rear-projection technology is the characteristic of high resolving power, high brightness, and it is simple in structure, and the potentiality that cost reduces are big.

LCoS light engine framework can roughly be divided into three-chip type and one chip at present, the principle of three-chip type LCoS is by Amici prism light beam to be divided into after R (red), G (green), B (indigo plant) light, respectively light beam is throwed into three LCoS panels, three look images of reflection are through closing photosystem in addition in conjunction with forming chromatic image again.But, because three-chip type LCoS light engine needs three panels, and need be in conjunction with multinomial beam split, close the light optical system, so volume is big, cost is also higher, so three-chip type LCoS is difficult to be used more widely, and can only be towards the professional purpose development of high-order.One chip LCoS light engine 9, as shown in Figure 1, it is with white light formation R (red), G (green), B (indigo plant) light in proper order with atwirl colour wheel 90 (ColorWheel), this primaries is successively through optical elements such as the first playback lens 91, lens arra 92, polar biased converter 93 (PS Converter), the second playback lens combination 94, polarization spectroscope 95, LCoS panel 96 and projection lens 97, and make and R (red), G (green), B (indigo plant) picture synchronization that primaries and driver produce just form the color separation image.When frequency was enough fast, because the characteristic that human eye vision persists, the observer just can see colored projected picture.The one chip light engine takes up room less relatively, only needs a slice panel, and system architecture is fairly simple, and therefore tool competitive edge on cost has the prospect of promoting the use of.But, under perfect condition, suppose that the light intensity of RGB three coloured light is identical, the visible light that comes out from light source, it is only remaining original 1/3 to arrive luminous energy on the LCoS panel or luminance brightness via the timesharing color separation of colour wheel, and brightness obviously reduces.In order to guarantee projection quality, just must improve bulb power, thereby cause bulb life to shorten as light source, the cost of optical projector increases.

For solving the low problem of light utilization efficiency of the Projection Display optical system that has one chip LCoS now, now existing all multi-schemes are released, for example by United States Patent (USP) the 6th, 669, the Projection Display optical system that is disclosed for No. 343, please join shown in Figure 2, this Projection Display optical system 8 mainly includes light source 80, lens arra 81, collector lens 82, colour esensitized equipment 83, polar biased converter 84, polarization spectroscope 85, LCoS panel 86, and projection lens 87, projection theory mainly is to utilize two dichroic mirrors 830,831 are divided into three the tunnel with light path, then utilize three rotating prisms 832,833,834 with RGB three looks from top to bottom scanning on LCoS panel 86 in regular turn, because there are three colors to impinge upon on the LCoS panel 86 simultaneously, under perfect condition, light utilization efficiency can reach 100%, but this system need have three rotating prisms and a plurality of dichroic mirrors etc. simultaneously, thereby makes its assembling and adjust all more complicated, difficulty.Therefore, this design has but been sacrificed the desired framework of one chip LCoS advantage simple, with low cost when realizing high light brightness.

Another solution, please join shown in Figure 3, it is by United States Patent (USP) the 6th, 702, the Projection Display optical system that is disclosed for No. 446, this Projection Display optical system 7 mainly includes light source 70, collector lens 71, photoconductive tube (light guide) 72, colour wheel 73, control device 74, and image shows module 75, wherein the function of photoconductive tube 72 is to allow the incident light that comes from left enter, and then penetrate uniformly and arrive colour wheel 73, suppose that R light passes through at point sometime, in the GB two color light reflected light conduit 72, because the left surface at photoconductive tube 72 is coated with mirror surface, only stay an aperture to pass through, so the GB two color light can be reflected for the light that comes from light source, and inject on the colour wheel 73 from the right opening, so just can be utilized once more.Yet, because ongoing light path is the diffusion light path, so its light recovery can't reach 100%, moreover because of the light velocity very fast, usually when GB light is reflected back to colour wheel, halo also fails in time to be switched to the plated film face that G light or B light can pass through, so the raising of 7 pairs of light utilization efficiencies of this Projection Display optical system is still limited.

Therefore, be necessary existing Projection Display optical system is further improved.

[summary of the invention]

The object of the present invention is to provide a kind of Projection Display optical system of light utilization efficiency and the good image quality of tool and projection arrangement of improving with this optical system, and be used for this optical system and the device optical element also have higher serviceable life, thereby reduce cost.

According to above-mentioned purpose of the present invention, the invention provides a kind of Projection Display optical system, be applicable to reflective display element, it includes can provide the irradiation of illumination beam module, the color light beam that illumination beam can be separated into several different-wavebands and directly advance with different light paths also shines splitting module on reflective display element, and projection lens, wherein splitting module has a rotatable colour wheel and a catoptron, this colour wheel is made up of required optical filtering piece, each optical filtering piece all optionally make required wave band the color light beam by and make the color beam reflection of other wave band, make colour wheel and catoptron constitute the light reflection channel, when illumination beam is incident in set incident angle on the colour wheel and after the light reflection channel between colour wheel and the catoptron repeatedly reflects, the color light beam irradiates that can produce several different-wavebands and directly advance with different light paths makes reflective display element be divided into several color lump images in reflective display element; And projection lens is that several color lump images are projeced on the screen.

Above-mentioned irradiation module comprises light source and parabolic mirror, and the illumination beam of collimation can be provided.

Above-mentioned parabolic mirror also can be replaced by ellipsoidal reflector, but also needs collimation lens, so that the illumination beam of collimation to be provided.

Between above-mentioned collimation lens and ellipsoidal reflector photoconductive tube can also be set, the light beam that wherein converges light emitted enters photoconductive tube, is emitted to collimation lens again after making its homogenising.

When reflective display element is reflection type liquid crystal cell (LCoS panel), this Projection Display optical system must need a polar biased converter, it is arranged between colour wheel and the reflective display element, can will shine in reflective display element after these color light beam polarizations.

Also be provided with a polarization spectroscope in above-mentioned Projection Display optical system, it is arranged between projection lens and the reflective display element, and will reflex to reflective display element from the color light beam of the polarization of polar biased converter.

Above-mentioned polarization spectroscope also can be arranged between polar biased converter and the reflective display element, and will reflex to projection lens from the color lump images of the polarization of reflective display element.

Compared to prior art, Projection Display optical system of the present invention and the projection arrangement with this optical system are provided with colour wheel and catoptron, and between colour wheel and catoptron, formed the light reflection channel, after illumination beam is through the selective transmission of colour wheel and the repeatedly reflection between catoptron and colour wheel, can put at one time and isolate several different-wavebands and, can improve light utilization efficiency like this with the color light beam that different light paths is directly advanced.

[description of drawings]

Fig. 1 is existing one chip LCoS light engine configuration diagram.

Fig. 2 is the synoptic diagram of an existing Projection Display optical system wherein.

Fig. 3 is the synoptic diagram of another existing Projection Display optical system.

Fig. 4 A is first embodiment of Projection Display optical system of the present invention.

Fig. 4 B is the segment beam path synoptic diagram in the optical system shown in Fig. 4 A.

Fig. 4 C is second embodiment of Projection Display optical system of the present invention.

Fig. 4 D is the segment beam path synoptic diagram in the optical system shown in Fig. 4 C.

Fig. 5 is the distribution plan that is positioned at the optical filtering piece on the colour wheel of Projection Display optical system of the present invention.

Fig. 6 A is that three coloured light are formed at the distribution situation of the color lump images on the LCoS panel at the very first time point of the colour wheel rotation of Projection Display optical system of the present invention.

Fig. 6 B is that three coloured light are formed at the distribution situation of the color lump images on the LCoS panel at second time point of the colour wheel rotation of Projection Display optical system of the present invention.

Fig. 6 C is that three coloured light are formed at the distribution situation of the color lump images on the LCoS panel at the 3rd time point of the colour wheel rotation of Projection Display optical system of the present invention.

Fig. 7 A is that three coloured light are formed at the distribution situation of the color lump images on the LCoS panel at the very first time point of the colour wheel rotation of Projection Display optical system of the present invention, and wherein three coloured light are overlapped.

Fig. 7 B is that three coloured light are formed at the distribution situation of the color lump images on the LCoS panel at second time point of the colour wheel rotation of Projection Display optical system of the present invention, and wherein three coloured light are overlapped.

Fig. 7 C is that three coloured light are formed at the distribution situation of the color lump images on the LCoS panel at the 3rd time point of the colour wheel rotation of Projection Display optical system of the present invention, and wherein three coloured light are overlapped.

[embodiment]

Please join shown in Fig. 4 A, Projection Display optical system 1 of the present invention is to be applicable to reflective display element, in the present embodiment, what reflective display element adopted is the LCoS panel, this Projection Display optical system 1 mainly includes irradiation module, splitting module, polarization conversion module, image demonstration module, and control die set, wherein shining module is to be used to provide illumination beam, it includes light source 10, reverberator 11, crosses filter 12, collimation lens 13; Splitting module is to be used for making illumination beam to be separated into several different-wavebands and the color light beam of directly advancing with different light paths and shining on reflective display element, it mainly includes catoptron 14 and colour wheel 16 (ColorWheel), and in the present embodiment, on the path that light beam is advanced, also provide pass grating element 15, playback lens 17, line style grating element 18, and lens arra 19; The polarization conversion module is to be used for not polarized light is converted to desirable linear polarized light, and it includes polar biased converter 20 (PS Converter) and polarization spectroscope 21 (PolarizationBeam Splitter is called for short PBS); Image shows that module is to be used for the image pattern on the reflective display element is incident upon on the screen, and in the present embodiment, it mainly includes LCoS panel 22 and projection lens 23; Control die set is mainly used to control light source 10 and drives LCoS panel 22, and it mainly includes light source control device 24 and driving control device 25, and synchronous through motor driver and colour wheel 16, also image information can be sent to LCoS panel 22 simultaneously.

Above-mentioned light source 10 can be the effluve fluorescent tube, and it can launch white light by arc discharge.

But above-mentioned reverberator 11 ambient light sources 10 and the light that light source is sent reflex to specific direction, this reverberator 11 can be an ellipsoidal reflector, it also can be parabolic mirror, difference is: the approximate directional light of the light that parabolic mirror can make light source send, and the approximate light that converges of the light that ellipsoidal reflector can make light source send.In the present embodiment, reverberator 11 is ellipsoidal reflectors.

Above-mentioned filter 12 excessively is that ultraviolet-infrared ray is crossed filter (UV-IR fillter), and it can filter ultraviolet ray and infrared ray in the illumination beam.

The light that is provided by light source 10 passes through the reflection of reverberator 11 and forms converging beam, converging beam is through forming parallel beam after the above-mentioned collimation lens 13, certainly this converging beam also can be introduced into a photoconductive tube (can with reference to photoconductive tube shown in Figure 3 72), will be emitted to collimation lens 13 after its homogenising again.

Above-mentioned colour wheel 16 is to be obliquely installed on the incident passage of parallel beam, it can high speed rotating and produces full color in the projected image, this colour wheel 16 is made up of required optical filtering piece, each optical filtering piece all optionally make required wave band the color light beam by and make the color beam reflection of other wave band, and light beam that reflects away and incident beam have certain angle, therefore be formed with the incident passage and the reflection channel of white light in a side of the light entrance face of colour wheel 16, then formed several and the corresponding transmittance passage of color light beam in a side of the light-transmissive surface of colour wheel 16.In the present embodiment, colour wheel 16 is separated into three big zones, and each zone is formed by three optical filtering pieces, i.e. RGB (red, green, blue) optical filtering piece, as shown in Figure 5.Certainly, also can as required colour wheel be divided into required number of areas.

Above-mentioned pass grating element 15 is to be arranged on the light reflection channel, and the cross sectional shape that is used for adjusting illumination beam makes the illumination beam that is passed through to be incident upon exactly on the colour wheel 16.

Above-mentioned catoptron 14 is level crossings, itself and colour wheel 16 configured in parallel, and be positioned on the light reflection channel of colour wheel 16, the folded light beam that comes from the colour wheel 16 can be reflexed on other position of colour wheel 16 once more whereby.When illumination beam directive colour wheel 16, the light beam of subband passes colour wheel through the selective transmission of the correspondence optical filtering piece of colour wheel 16, and in the optical channel corresponding, propagate with it, another part band light beam is then reflected back by colour wheel 16, this part is reflexed to the position at other optical filtering piece place of colour wheel 16 once more by the colour wheel 16 beam reflected mirror 14 that will be reflected, by continuous selective transmission and reflection, final full illumination light beam all can be separated by colour wheel 16 and transmission is gone out, and the color light beam that produces several different-wavebands and directly advance with different light paths, in the present embodiment, mainly be to be separated into three kinds of colored light beam (being detailed later).Because the speed of light reflection is very fast, so the primaries of illumination beam almost is to put at one time to be gone out by transmission, and light utilization efficiency can reach 100% like this.

Above-mentioned playback lens (relay lens) 17, lens arra (lens array) 19 and line style grating element 18 are to be arranged between colour wheel and the reflective display element, and be positioned on the transmission line of the three primary colors light beam of being gone out by colour wheel 16 transmissions, the light stream density that can be used to adjust the three primary colors light beam makes its energy even transmission, and line style grating element 18 wherein mainly is to be used for modulating the color lump images size of these color light beam irradiates on reflective display element, thereby makes these light beams to be projeced into accurately on the reflective display element.

Above-mentioned polar biased converter 20 (PS converter) is to be used for accepting not polarized light, and converts it to desirable linear polarized light, and in the present embodiment, it is to convert not polarized light to the S polarisation, to improve light utilization efficiency.

Above-mentioned polarization spectroscope 21 (PBS) is to bind the prism that forms by two 45 degree isosceles right-angle prism bases, it is arranged between projection lens 23 and the reflective display element, when non-linear polarization light is incident to PBS21, PBS21 can reflect the S polarisation (perpendicular to the plane of incident ray) of incident light, and allows P polarisation (plane that is parallel to incident ray) pass through.Therefore, after the polarization conversion through above-mentioned polar biased converter 20 of non-linear polarization light, desirable linear polarized light (S polarisation) will all be incident to PBS21, and by all reflections and being incident on the LCoS panel 22 of PBS21, shown in Fig. 4 B.In addition, this PBS21 can also with incide on the LCoS panel 22 light beam with the reflection after light beam separate.

Above-mentioned LCoS panel 22 is reflective display elements, be used to accept incident light and required image is added to incident light, and when liquid crystal display is bright attitude, the S polarisation will change over the P polarisation, and the P polarisation will pass PBS21 (please join shown in Fig. 4 B), and can enter projection lens 23 at last, and project on the display screen (not shown) with the imaging amplification and with it by projection lens 23 then, so just can obtain required image.

Projection Display optical system 1 of the present invention also can adopt the embodiment shown in Fig. 4 C, its difference with the optical system shown in Fig. 4 A is: LCoS panel 22 is different with the relative position of PBS21, they be that PBS21 is between LCoS panel 22 and polar biased converter 20, and the path that its light path is advanced is also slightly different.In the optical system shown in Fig. 4 C, the main effect of polar biased converter 20 is to be the P polarisation with not polarized phototransformation, the segment beam path of this system shown in Fig. 4 D, the P polarisation will all pass PBS21 and arrive on the LCoS panel 22, to be changed polarisation after the modulation of P polarisation through LCoS panel 22 into S, final this S polarisation will be entered projection lens 23 by the whole reflections of PBS21, and then imaging is amplified and it is projected on the viewing area (not shown) by projection lens 23, so also can obtain needed image.

Please continue with reference to Fig. 4 A and shown in Figure 5, when colour wheel 16 when very first time point is rotated, the parallel beam incident for the first time splitting module that the irradiation module penetrates, suppose R light to pass the first red optical filtering piece (R) on the colour wheel 16 in advance and enter first passage a, GB light then is reflected to the catoptron 14 that is positioned at colour wheel 16 the place aheads, GB light enters colour wheel 16 once again after the reflection of catoptron 14, G light can pass the first green optical filtering piece (G) on the colour wheel 16 and enter second channel b this moment, and B light then is reflected onto catoptron 14, B light passes colour wheel 16 after the reflection once again of catoptron 14, enter third channel c at last.Can find out thus, on very first time point, the three primary colors RGB of white light has passed through passage a, b, c respectively, and then afterwards through suitable lens arra 19 and optical frames group (comprising playback lens 17 and line style grating element 18), the colored light beam of three passages (RGB) all will be incident to image and show in the module, and incide on the LCoS panel 22.The light beam of supposing a passage is to be radiated on the area on the right 1/3 on the LCoS panel 22, and the light beam of b passage is the centre position that is radiated at LCoS panel 22, and the light beam of c passage is to be radiated on the area on the left side 1/3 of LCoS panel 22.Therefore, the distribution of color lump images on the LCoS panel that is formed by primaries (RGB) at very first time point as shown in Figure 6A.

When colour wheel 16 forwards next time point (second time point) to, variation has also taken place in the primaries of admission passage a, b, c, be followed successively by GBR, when these primaries incided on the LCoS panel 22, the distribution situation of formed color lump images was shown in Fig. 6 B.In like manner, on the 3rd time point, the primaries of admission passage a, b, c is followed successively by BRG, and the distribution situation of the color lump images that forms on LCoS panel 22 is shown in Fig. 6 C.

In conjunction with being incident upon the distribution situation of the color lump images on the LCoS panel 22 by primaries shown in Fig. 6 A to 6C, can know, on 1/3 area of the right of LCoS panel 22, RGB three coloured light will successively and can circulate irradiation thereon, since the effect of persistence of vision, and can synthesize needed color.In like manner, on other zone of LCoS panel 22, can synthesize needed color too.Because the high-speed rotation of colour wheel 16, three coloured light can ceaselessly circulate, and make that the light utilization efficiency under perfect condition reaches 100%, thereby improve image quality.In addition, because the rotating member that Projection Display optical system 1 of the present invention is adopted only has 16 1 of colour wheels, so institutional adjustment is simple, and is easy to use.

In addition, when three coloured light irradiation LCoS panel 22, partly overlapping situation may take place, thereby at overlapping generation had the color lump images of complementary colors, shown in Fig. 7 A, when on R light and the G rayed LCoS panel 22, overlap, overlapping produces complementary colors yellow (Yellow is called for short Y), and each overlapping width, area is equal to; When G light and B rayed LCoS panel 22, overlap, overlapping produces complementary colors cyan (Cyan is called for short C), and each overlapping width, area also is equal to.When colour wheel 16 rotates in regular turn, please then refer to shown in Fig. 7 B, when B light and R rayed LCoS panel 22, to overlap, overlapping produces complementary colors fuchsin (Magenta is called for short M), and each overlapping width, area is equal to.Partly overlapping situation has in like manner also appearred in Fig. 7 C.

Please refer to shown in Fig. 7 A to 7C, LCoS panel 22 also can produce the color change of similar Fig. 6 A to 6C simultaneously, but primaries at every turn all can be partly overlapping and produce complementary coloured light in regular turn.But Non-overlapping Domain hybrid RGB primaries produces the color of multiple variation; But produce the color of multiple variation as for the complementary coloured light in overlapping region also mixed C MY, and when the required color of projection is black K, only need close the LCoS panel, be not rendered as black with regard to not producing any color.

When image processing, control die set will be controlled corresponding pixel (Pixel) point on the LCoS panel 22 according to speed and angle that colour wheel 16 rotates, and the GTG of doing 256 rank is controlled, cooperate visual persistence effect, three kinds of colors of hybrid RGB in the extremely short time, kind of change in color surplus createing 16,000,000, thus high-quality colour picture can be formed.

By Projection Display optical system of the present invention that the foregoing description disclosed and device with this optical system is to have utilized catoptron 14 and colour wheel 16 to improve light utilization efficiency, and this principle can also be applied to DLP (Digital Light Processing, the digital light processing) in the shadow casting technique, and being it, the principal feature of DLP shadow casting technique utilized digital micro-mirror device (DigitalMicromirrorDevice, be called for short DMD) but not the LCoS panel, because of both image principles of reflection are similar, do not describe in detail at this.Be noted that, when using the DMD micro-mirror device, can omit and use polar biased converter and polarization spectroscope.

Claims

1. Projection Display optical system, be applicable to reflective display element, it includes the irradiation module that is used to provide illumination beam, separable illumination beam also obtains the splitting module of required light beam, and projection lens, wherein splitting module has the colour wheel of being made up of several optical filtering pieces, be positioned at each optical filtering piece on the colour wheel all can optionally make required wave band the color light beam by and make the color beam reflection of other wave band, it is characterized in that: splitting module has a catoptron, it is positioned on the light path at folded light beam place, be used for acceptance and reflection by the colour wheel beam reflected, thereby make colour wheel and catoptron constitute the light reflection channel, when illumination beam with set incident angle incident colour wheel and after the light reflection channel between colour wheel and the catoptron repeatedly reflects, the color light beam that can produce several different-wavebands and directly advance with different light paths also shines on reflective display element, make on reflective display element, to have formed several color lump images, and these color lump images will be by projection lens projects on screen.

2. Projection Display optical system as claimed in claim 1 is characterized in that: the irradiation module comprises light source and parabolic mirror, and the illumination beam of collimation can be provided.

3. Projection Display optical system as claimed in claim 1 is characterized in that: the irradiation module comprises light source, ellipsoidal reflector and collimation lens, converge the light beam of light emitted by ellipsoidal reflector after, the illumination beam of collimation is provided via collimation lens again.

4. Projection Display optical system as claimed in claim 3 is characterized in that: also include a photoconductive tube in this Projection Display optical system, the light beam that converges light emitted can enter this photoconductive tube, is emitted to collimation lens again after making its homogenising.

5. as claim 2 or 3 described Projection Display optical systems, it is characterized in that: also include lens arra in this Projection Display optical system, it can will shine in reflective display element behind these color beam uniformities from splitting module again.

6. Projection Display optical system as claimed in claim 1 is characterized in that: also include the pass grating element in this Projection Display optical system, it is arranged on the light reflection channel and is used for adjusting the cross sectional shape of illumination beam.

7. Projection Display optical system as claimed in claim 1, it is characterized in that: also include the line style grating element in this Projection Display optical system, it is arranged at and is used for modulating the optical filtering piece image size of these color light beam irradiates on reflective display element between colour wheel and the reflective display element.

8. Projection Display optical system as claimed in claim 1, it is characterized in that: when reflective display element is a reflection type liquid crystal cell, this Projection Display optical system also can comprise a polar biased converter, it is arranged between colour wheel and the reflective display element, can will shine in reflective display element after these color light beam polarizations.

9. Projection Display optical system as claimed in claim 8, it is characterized in that: in this Projection Display optical system, also include the polarization spectroscope, it is arranged between projection lens and the reflective display element, and the color light beam from the polarization of polar biased converter can be reflexed to reflective display element.

10. Projection Display optical system as claimed in claim 8, it is characterized in that: in this Projection Display optical system, also include the polarization spectroscope, it is arranged between polar biased converter and the reflective display element, and the color lump images from the polarization of reflective display element can be reflexed to projection lens.

11. Projection Display optical system as claimed in claim 3 is characterized in that: comprise also that in this Projection Display optical system one crosses filter, it is arranged between collimation lens and the light source.

12. Projection Display optical system as claimed in claim 1, it is characterized in that: in this Projection Display optical system, also comprise playback lens, it is arranged between colour wheel and the reflective display element, and the color light beam irradiates that can directly advance with several different-wavebands and with different light paths is on reflective display element.

13. Projection Display optical system, can improve light utilization efficiency, it mainly includes the light source that is used to provide illumination beam, the colour wheel of forming by several optical filtering pieces, can form the reflective display element of image, and the image on the reflective display element can be projeced into projection lens in the image viewing area, wherein each the optical filtering piece on the colour wheel all can optionally make required wave band the color light beam by and make the color beam reflection of other wave band, it is characterized in that: the light incident passage of the light reflection channel at folded light beam place and former illumination beam all has certain angle between the same side of colour wheel and two passages, the color light beam of going out from the colour wheel transmission then is positioned at the opposite side of colour wheel and has formed the transmittance passage; The light reflection channel of folded light beam is provided with catoptron, be used for accepting to come from the folded light beam of colour wheel, this catoptron can reflex to this folded light beam on other optical filtering piece of colour wheel once more to carry out selective transmission once more, makes the illumination beam that is produced by light source all will go out and form the color light beam that several are directly advanced along different light paths from the colour wheel transmission in this way; Reflective display element is to be positioned on the transmittance passage of color light beam, be used for accepting the color light beam, and can form several color lump images, and these color lump images all will be by projection lens projects in the image viewing area.

14. Projection Display optical system as claimed in claim 13 is characterized in that: colour wheel is to be obliquely installed on the incident passage of illumination beam, and catoptron is and the colour wheel configured in parallel.

15. Projection Display optical system as claimed in claim 14 is characterized in that: reflective display element is the LCoS panel.

16. Projection Display optical system as claimed in claim 15 is characterized in that: also include a polar biased converter in this Projection Display optical system, it is arranged between colour wheel and the reflective display element, can be with these color light beam polarization conversions.

17. Projection Display optical system as claimed in claim 16, it is characterized in that: in this Projection Display optical system, also include the polarization spectroscope, it is arranged between projection lens and the reflective display element, and the color light beam from the polarization of polar biased converter can be reflexed on the reflective display element, the color lump images that comes from reflective display element then will be incident to projection lens by this polarization spectroscope.

18. Projection Display optical system as claimed in claim 16, it is characterized in that: in this Projection Display optical system, also comprise the polarization spectroscope, it is arranged between polar biased converter and the reflective display element, and the color light beam that comes from the polarization of polar biased converter will be all by this polarization spectroscope, and arrive on the reflective display element, and this polarization spectroscope also can reflex to projection lens with the color lump images from the polarization of reflective display element.

19. as claim 13,17 or 18 described Projection Display optical systems, it is characterized in that: also include a parabolic mirror in this Projection Display optical system, its ambient light source is to provide the illumination beam of collimation.

20. as claim 13,17 or 18 described Projection Display optical systems, it is characterized in that: also include an ellipsoidal reflector in this Projection Display optical system, its ambient light source also converges illumination beam.

21. Projection Display optical system as claimed in claim 20 is characterized in that: in this Projection Display optical system, also include collimation lens, after illumination beam process collimation lens, can form the illumination beam of collimation.

22. Projection Display optical system as claimed in claim 21, it is characterized in that: in this Projection Display optical system, also include a photoconductive tube, can enter photoconductive tube by the illumination beam of light emitted again via after the converging of ellipsoidal reflector, can will be emitted to collimation lens behind the beam uniformity more like this.

23. as claim 13,17 or 18 described Projection Display optical systems, it is characterized in that: also comprise lens arra in this Projection Display optical system, it can will shine in reflective display element behind these color beam uniformities from colour wheel again.

24. Projection Display optical system as claimed in claim 23 is characterized in that: in this Projection Display optical system, also include the pass grating element, the cross sectional shape that it is arranged at the light reflection channel and is used for adjusting illumination beam.

25. Projection Display optical system as claimed in claim 24, it is characterized in that: also include the line style grating element in this Projection Display optical system, it is arranged at and is used for modulating the color lump images size of these color light beam irradiates on reflective display element between colour wheel and the reflective display element.

26. Projection Display optical system as claimed in claim 22 is characterized in that: also include one and cross filter in this Projection Display optical system, it is arranged between collimation lens and the light source.

27. Projection Display optical system as claimed in claim 21, it is characterized in that: in this Projection Display optical system, also comprise playback lens, it is arranged between colour wheel and the reflective display element, and the color light beam irradiates that can directly advance with several different-wavebands and with different light paths is on reflective display element.

28. as claim 13 or 14 described Projection Display optical systems, it is characterized in that: reflective display element is the DMD digital micro-mirror device.

29. light-dividing device, can be applicable in the Projection Display optical system to improve light utilization efficiency, it includes a rotatable colour wheel, this colour wheel is made up of required optical filtering piece, each optical filtering piece all optionally make required wave band the color light beam by and make the color beam reflection of other wave band, it is characterized in that: be positioned on the light path at folded light beam place and also be provided with a catoptron, be used for accepting and reflecting this folded light beam, thereby between colour wheel and catoptron, form the light reflection channel, when visible light beam is incident in colour wheel and after the light reflection channel between colour wheel and the catoptron repeatedly reflects with set incident angle, the color light beam that can produce several different-wavebands and directly advance with different light paths, thus light utilization efficiency improved.

30. light-dividing device as claimed in claim 29 is characterized in that: colour wheel and catoptron are configured in parallel, and visible light beam is that oblique incidence at a certain angle is to colour wheel.

31. a projection arrangement can improve light utilization efficiency, it includes irradiation module, splitting module, image demonstration module and control die set, wherein shines module and has a light source, is used to provide illumination beam; Splitting module has a rotatable colour wheel, and this colour wheel is made up of required optical filtering piece, each optical filtering piece all optionally make required wave band the color light beam by and make the color beam reflection of other wave band; Image shows that module includes display element and projection lens, display element is to be used for accepting to come from the color light beam of splitting module and it being modulated the colorama that has image pattern with output, and projection lens is that the colorama that is used for having image pattern is incident upon on the desired zone; Control die set mainly is to be used for controlling light source, colour wheel slewing rate and put on electric signal on the reflective display element, it is characterized in that: the path by the formed folded light beam of colour wheel is provided with a catoptron, be used for accepting and reflecting this folded light beam, thereby between colour wheel and catoptron, constitute the light reflection channel, when illumination beam with set incident angle incident colour wheel and after the light reflection channel between colour wheel and the catoptron repeatedly reflects, the color light beam that can produce several different-wavebands and directly advance with different light paths, these color light beams will be shown element simultaneously and accept, after ovennodulation, will go out by projection lens projects.

32. projection arrangement as claimed in claim 31 is characterized in that: colour wheel is to be obliquely installed on the incident passage of illumination beam, and catoptron is and the colour wheel configured in parallel.

33. projection arrangement as claimed in claim 31 is characterized in that: display element is reflective display element.

34. projection arrangement as claimed in claim 32, it is characterized in that: when reflective display element is a reflection type liquid crystal cell, this projection arrangement also includes a polar biased converter, it is arranged between colour wheel and the reflective display element, will shine in reflective display element after these color light beam polarizations.

35. projection arrangement as claimed in claim 34, it is characterized in that: this projection arrangement also includes a polarization spectroscope, it is arranged between projection lens and the reflective display element, and will reflex to reflective display element from the color light beam of the polarization of polar biased converter.

36. projection arrangement as claimed in claim 34, it is characterized in that: this projection arrangement also includes the polarization spectroscope, it is arranged between polar biased converter and the reflective display element, and will reflex to projection lens from the colorama of the polarization with image pattern of reflective display element.

37. as claim 33,35 or 36 described projection arrangements, it is characterized in that: the irradiation module also includes a parabolic mirror, and its illumination beam that can make light source send collimates.

38. as claim 33,35 or 36 described projection arrangements, it is characterized in that: the irradiation module also includes ellipsoidal reflector and collimation lens, converge the light beam of light emitted by ellipsoidal reflector after, the illumination beam of collimation is provided via collimation lens again.

39. projection arrangement as claimed in claim 38 is characterized in that: this projection arrangement also includes a photoconductive tube, and the light beam that converges light emitted can enter photoconductive tube, and is emitted to collimation lens again after making its homogenising.

40. projection arrangement as claimed in claim 33 is characterized in that: this projection arrangement also includes lens arra, and it can will shine in reflective display element behind these color beam uniformities from splitting module again.

41. projection arrangement as claimed in claim 33 is characterized in that: this projection arrangement also includes the pass grating element, the cross sectional shape that it is arranged at the light reflection channel and is used for adjusting illumination beam.

42. projection arrangement as claimed in claim 33, it is characterized in that: this projection arrangement also includes the line style grating element, and it is arranged between colour wheel and the reflective display element and is used for modulating the optical filtering piece image size of these color light beam irradiates on reflective display element.

43. projection arrangement as claimed in claim 38 is characterized in that: this projection arrangement also includes one and crosses filter, and it is arranged between collimation lens and the light source.

44. projection arrangement as claimed in claim 33, it is characterized in that: this projection arrangement also includes playback lens, it is arranged between colour wheel and the reflective display element, and the color light beam irradiates that can directly advance with several different-wavebands and with different light paths is in reflective display element.