CN101393322A - Stereo projection optical system - Google Patents
Stereo projection optical system Download PDFInfo
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- CN101393322A CN101393322A CNA2007102017219A CN200710201721A CN101393322A CN 101393322 A CN101393322 A CN 101393322A CN A2007102017219 A CNA2007102017219 A CN A2007102017219A CN 200710201721 A CN200710201721 A CN 200710201721A CN 101393322 A CN101393322 A CN 101393322A
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- light
- polarized light
- optical system
- projection optical
- stereo projection
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Abstract
The invention relates to a stereoprojection optical system, which comprises an image absorber, an analyzer and a transmission optical modulator, wherein the image absorber is used for receiving incident light and transmitting first polarized light and second polarized light the polarization states of which are perpendicular to each other; and the analyzer is used for driving light in a special polarization direction to pass through. When the transmission optical modulator is in the turn-on state, the first polarized light passes through the transmission optical modulator; and when the transmission optical modulator is in the cutoff state, the transmission optical modulator modulates the received first polarized light into the second polarized light which is then transmitted. When used, the stereoprojection optical system can make a left eye and a right eye of an observer acquire images with different polarization states through the transmission optical modulator, and simultaneously eliminates image noise caused by an actual optical element and skimble-skamble space information in a light path by utilization of the analyzer which is arranged on the light path, thereby improving the contrast gradient of projected emergent light.
Description
Technical field
The present invention is about a kind of projection optical system, especially a kind of stereo projection optical system with high-contrast.
Background technology
In recent years, image projector, especially digital projector is popular gradually as the instrument that shows multiple information to spectators.Generally, these projector image projection of being used for being generated by computing machine is to screen.Concerning the beholder, the image of image projector projection looks like the planar image usually, can't show any image depth information except that image itself.This demonstration goes for showing multiple information.But in some cases, the beholder wishes to have than two dimension and shows to a greater degree the depth of field of display image or the projector of architectural feature.
A kind of mode that the image that two dimension is shown can provide image depth is by three-dimensional ground display image.Stereo-picture is commonly referred to " three-dimensional " or " 3D " image, has depth dimensions In the view of the beholder.These images comprise separately, folded full left eye and eye image, when these image setting become apish right and left eyes to watch, because the minute differences of the three-dimensional object surface that eye causes at interval, and the depth image that has.Left eye and eye image are to show that so promptly beholder's right eye be can't see left-eye image, and left eye be can't see eye image.The optical light filter that this display mode is generally worn by means of the beholder.
Common stereo projection optical system all includes the left image producing component and the right image producing component that are used for that incident light resolved into the polarization beam apparatus of different polarization direction and are used for producing by different polarization light left-eye image and eye image.Project on the screen by the left-and right-eye images that left and right image producing component is produced,, just can see three-dimensional image when people's right and left eyes is put on the glasses of different polarization direction.
But after light penetrates from polarization beam apparatus, in emergent light, contain mixed and disorderly light, the existence of this mixed and disorderly light, partly cause be all real optical element the intrinsic image noise that optical signature caused, as polarization beam apparatus when receiving high-caliber luminous flux, it generally becomes thermal load and physical distortion takes place and causes stress birefrin, this stress birefrin meeting causes the reduction of depolarizing of light and contrast, also having a reason is that described polarized light is respectively on separately a left side, receive outside the spatial information on the right image producing component, also can receive by other light on the described polarized light light path, as the mixed and disorderly spatial information that birefringence produced in the optical element materials such as polarization beam splitter, and these mixed and disorderly light were not isolated and excluded its noise before being projected onto display effectively, and these image noise and mixed and disorderly spatial information can reduce the contrast of the emergent light that projects to screen.
Summary of the invention
In view of this, be necessary to provide a kind of can improve contrast stereo projection optical system.
A kind of stereo projection optical system, it comprises and being provided with according to light path:
An image assimilator is used to receive incident light, and spatial information is modulated and loaded to this incident light, and outgoing is through modulating and be loaded with vertical first polarized light and second polarized light in polarization direction of spatial information;
An analyzer, it is arranged on the emitting light path of first polarized light of described image assimilator outgoing, is used to make the light of particular polarization to pass through;
A transmissive light modulator, be arranged on the emitting light path of first polarized light of described analyzer outgoing, this transmissive light modulator has unlatching and ends two duties that replace, when this transmissive light modulator is in opening, described first polarized light passes described transmissive light modulator, when this transmissive light modulator was in cut-off state, described transmissive light modulator was modulated to second polarized light and outgoing with described first polarized light of incident.
Can be when above-mentioned stereo projection optical system uses by making this transmissive light modulator have unlatching as the transmissive light modulator input signal and ending two duties that replace, make beholder's images of left and right eyes alternately obtain the image of different polarization state, when the frequency of this input signal is enough fast, beholder's right and left eyes is put on orthogonal two polaroids of analyzing direction respectively, just can observe three-dimensional image information.Utilize the analyzer that is provided with on the light path simultaneously, under the effect of this analyzer, the light that allows particular polarization by be isolated and excluded by real optical element the intrinsic image noise that optical signature caused and by the mixed and disorderly spatial information that birefringence produced in the optical element material in the described polarized light light path, thereby promoted the contrast of the emergent light of institute's projection.
Description of drawings
Fig. 1 is the structural representation of stereo projection optical system when described transmissive light modulator is opened of first embodiment provided by the invention;
Fig. 2 is the structural representation of stereo projection optical system when described transmissive light modulator is ended of first embodiment provided by the invention;
Fig. 3 be Fig. 1 described transmissive light modulator input signal and with respect to the oscillogram of the polarized state of light of right and left eyes output;
Fig. 4 is the structural representation of the stereo projection optical system of second embodiment provided by the invention.
Embodiment
For the present invention being done further explanation, lift following preferred embodiment and conjunction with figs. and be described in detail as follows.
See also Fig. 1 and Fig. 2, be the structural representation of the stereo projection optical system of first embodiment provided by the invention.This stereo projection optical system 100 comprises the analyzer 13 on the light source assembly 11 that sets gradually along optical path direction, image assimilator 12, the emitting light path that is arranged at described image assimilator 12, a transmissive light modulator 14 and a projection lens 15 that is arranged on described analyzer 13 emitting light paths.
Described light source assembly 11 comprises a lighting source being provided with according to light path 111, a colour wheel 112 and an integrator 113.Described lighting source 111 emissions comprise the white light of the required ruddiness of color display (R), green glow (G) and blue light (B).This light source 11 can be Halogen lamp LED, metal halide lamp, xenon lamp or LED etc.In the present embodiment, this light source 11 is a Halogen lamp LED.Described colour wheel 112 comprises red, green, blue three look districts, its can be under the drive of motor (figure do not show) high speed rotating, to be equipped with various colors to projecting light path.The light that described integrator 113 is used for homogenising and uses light source 11 to send effectively.
Described image assimilator 12 comprises a polarization beam apparatus 121 and reflective spatial light modulator 122 that is provided with according to light path.Described polarization beam apparatus (Polarization Beam Splitter, PBS) 121 are used for the nonpolarized light from light source assembly 11 is become first polarized light and second polarized light, first polarized light is the S polarized light in the present embodiment, and second polarized light is the P polarized light.This S polarized light is by these polarization beam apparatus 121 reflections, and the P polarized light sees through this polarization beam apparatus 121.This polarization beam apparatus 121 can also can be polarization splitting prism for metal grate type polaroid (Wire Grid Polarizer is called for short the WGP polaroid), and in the present embodiment, this polarization beam apparatus 121 is a polarization splitting prism.This polarization beam apparatus 121 is according to different with the effect of P polarized light to the S polarized light, can be divided into reflection S polarized light and sees through P polarized light, two kinds of forms of reflected P polarized light with seeing through the S polarized light.In the present embodiment, described polarization beam apparatus 23 reflection S polarized lights, and can allow the P polarized light see through.
Described reflective spatial light modulator 122 can be liquid crystal on silicon (Liquid Crystal on Silicon, LCoS) display panel.This liquid crystal on silicon display panel process structure combines liquid crystal technology and SIC (semiconductor integrated circuit) technology.The LCoS panel utilizes manufacture of semiconductor to make and drives panel, on electric crystal, adopt grinding technique to polish then, and plated aluminum or silver etc. are used as catoptron, form the CMOS substrate, pour into liquid crystal molecule and packaging and testing after pasting CMOS substrate and the glass substrate that contains transparency electrode entirely again, form the LCoS panel.The LCoS panel comes modulating the incident light and adds spatial information to incident light by the control polarized state of light, forms the emergent light through ovennodulation that comprises this incident light and this spatial information.Described spatial information can be the control signal voltage that this LCoS loaded, the on off state of the direct control TFT of this control signal voltage, utilize this thin film transistor (TFT) to control the deflection state of described liquid crystal molecule again, and liquid crystal molecule has tangible optical anisotropy, can control light, thereby be embodied as the purpose of incident light load image signal from incident light.In the present embodiment, spatial information is modulated and loaded to 122 pairs of S polarized lights of this reflective spatial light modulator, and the P polarized light through modulating and be loaded with spatial information is reflected away, and this P polarized light sees through polarization beam apparatus 121 and launches.
Described analyzer 13 can be a polaroid, and it can allow the light of certain polarization direction pass through, and absorbs the light of other polarization direction.For example allow the P polarized light pass through, and absorb the S polarized light or allow the S polarized light pass through, and absorb the P polarized light.In the present embodiment, this analyzer 13 absorbs the S polarized light and allows the P polarized light pass through.
Described transmissive light modulator 14 can for liquid crystal indicator (Liquid Crystal Dispaly, LCD).By controlling the unlatching of this transmissive light modulator 14 for these transmissive light modulator 14 input pulse signals and ending.As shown in Figure 3, be the input signal of input transmissive light modulator 13 and the oscillogram of exporting polarized state of light with respect to right and left eyes.In the present embodiment, described transmissive light modulator 13 is opened according to waveform input signal figure shown in Figure 3 or is ended, thereby the S polarized light and the P polarized light of different polarization direction alternately are provided for right and left eyes.When importing this signal for this transmissive light modulator, this transmissive light modulator 13 just can alternately be exported S polarized light or the P polarized light light with different polarization direction that beholder's right and left eyes is provided.Be understandable that the cycle of this input signal is adjustable.By the unlatching of transmissive light modulator 13 and by controlling institute's input polarization polarisation of light direction, in the present embodiment, what import transmissive light modulator 13 is the P polarized light, is example with the P polarized light down, and the action principle of this transmissive light modulator 13 is described.Certainly, what can expect is, identical with the P polarized light to the effect of S polarized light.
When this transmissive light modulator 13 was opened, as shown in Figure 1, this P polarized light directly passed this transmissive light modulator 13 and can not modulate this P polarization polarized state of light.But, when transmissive light modulator 13 is ended, as shown in Figure 2, will modulate the P polarized light that passes, promptly the P polarized light of input is modulated to the output of S polarized light, thereby the light of the different polarization direction of right and left eyes can alternately be provided for the beholder.
Described projection lens 15 is arranged on the light path of emergent light of transmissive light modulator 14, is used for the formed image of emergent light is amplified, and enlarged image is projected on the screen (figure does not show).
Fig. 4 is the structural representation of the stereo projection optical system of second embodiment provided by the invention.This stereo projection optical system 200 comprises that the light source assembly 21 that sets gradually along optical path direction, 22, one of image assimilator are arranged at the analyzer 23 on the emitting light path of described image assimilator 22, a transmissive light modulator 24 and a projection lens 25 that is arranged on described analyzer 23 emitting light paths.
This second embodiment is that with the different of first embodiment composition structure of described image assimilator 22 is different, and the image assimilator 22 of second embodiment comprises a polarization beam apparatus 221 and a penetration spatial light modulator 222.This penetration spatial light modulator 222 can for liquid crystal indicator (Liquid Crystal Dispaly, LCD).Described penetration spatial light modulator 222 comes modulating the incident light and adds spatial information to incident light by control input polarized state of light, forms the emergent light through ovennodulation that comprises this spatial information.The control signal voltage that described spatial information can be loaded for described penetration spatial light modulator 222, the on off state of the direct control TFT of this control signal voltage, utilize this thin film transistor (TFT) to control the deflection state of described liquid crystal molecule again, and liquid crystal molecule has tangible optical anisotropy, can control light, thereby be embodied as the purpose of incident light load image signal from incident light.In the present embodiment, the S polarized light of 222 pairs of incidents of this described penetration spatial light modulator is modulated, and on described S polarized light overlay space information, to produce an emergent light that comprises spatial information, promptly include the P polarized light of spatial information.This P polarized light is launched after passing this penetration spatial light modulator 222
Because of described analyzer 23 can allow the light of certain polarization direction pass through, and absorb the light of other polarization direction.For example allow the P polarized light pass through, and absorb the S polarized light or allow the S polarized light pass through, and absorb the P polarized light.So allow the P polarized light pass through when this analyzer 23, and when absorbing the S polarized light, this analyzer 23 is arranged on the emitting light path of S polarized light of penetration spatial light modulator 222.When this analyzer 23 allows the S polarized light pass through, and when absorbing the P polarized light, this analyzer 23 is arranged on the emitting light path of P polarized light of penetration spatial light modulator 222.In the present embodiment, this analyzer 13 is arranged on the emitting light path of S polarized light of penetration spatial light modulator 2222.And this P polarized light or the S polarized light transmission light path in other optical element such as transmissive light modulator 24 is identical.
Can be when above-mentioned stereo projection optical system uses by making this transmissive light modulator have unlatching as the transmissive light modulator input signal and ending two duties that replace, make beholder's images of left and right eyes alternately obtain the image of different polarization state, when the frequency of this input signal is enough fast, beholder's right and left eyes is put on orthogonal two polaroids of analyzing direction respectively, just can observe three-dimensional image information.Utilize the analyzer that is provided with on the light path simultaneously, under the effect of this analyzer, the light that allows particular polarization by be isolated and excluded by real optical element the intrinsic image noise that optical signature caused and by the mixed and disorderly spatial information that birefringence produced in the optical element material in the described polarized light light path, thereby promoted the contrast of the emergent light of institute's projection.
In addition, those skilled in the art also can do other variation in spirit of the present invention, as long as it does not depart from technique effect of the present invention, all should be included within the present invention's scope required for protection.
Claims (10)
- [claim 1] a kind of stereo projection optical system is characterized in that, this stereo projection optical system comprises and being provided with according to light path:An image assimilator is used to receive incident light, and spatial information is modulated and loaded to this incident light, and outgoing is through modulating and be loaded with vertical first polarized light and second polarized light in polarization direction of spatial information;An analyzer, it is arranged on the emitting light path of first polarized light of described image assimilator outgoing, is used to make the light of particular polarization to pass through;A transmissive light modulator, be arranged on the emitting light path of first polarized light of described analyzer outgoing, this transmissive light modulator has unlatching and ends two duties that replace, when this transmissive light modulator is in opening, described first polarized light passes described transmissive light modulator, when this transmissive light modulator was in cut-off state, described transmissive light modulator was modulated to second polarized light and outgoing with described first polarized light of incident.
- [claim 2] stereo projection optical system as claimed in claim 1 is characterized in that: described analyzer is a polaroid.
- [claim 3] stereo projection optical system as claimed in claim 1 is characterized in that: described transmissive light modulator is a liquid crystal indicator.
- [claim 4] stereo projection optical system as claimed in claim 1 is characterized in that: described image assimilator comprises a polarization beam apparatus and reflective spatial light modulator that is provided with according to light path.
- [claim 5] stereo projection optical system as claimed in claim 4 is characterized in that: described polarization beam apparatus is a kind of of metal grate type polaroid and polarization splitting prism.
- [claim 6] stereo projection optical system as claimed in claim 4 is characterized in that: described reflective spatial light modulator is a silica-based liquid crystal panel.
- [claim 7] stereo projection optical system as claimed in claim 1 is characterized in that: described image assimilator comprises a polarization beam apparatus and penetration spatial light modulator that is provided with according to light path.
- [claim 8] stereo projection optical system as claimed in claim 7 is characterized in that: described polarization beam apparatus is a kind of in metal grate type polaroid and the polarization splitting prism.
- [claim 9] stereo projection optical system as claimed in claim 7 is characterized in that: described penetration spatial light modulator is a liquid crystal indicator that is loaded with spatial information.
- [claim 10] stereo projection optical system as claimed in claim 1 is characterized in that: described first polarized light is a kind of in S polarized light and the P polarized light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102017219A CN101393322A (en) | 2007-09-17 | 2007-09-17 | Stereo projection optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102017219A CN101393322A (en) | 2007-09-17 | 2007-09-17 | Stereo projection optical system |
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| Publication Number | Publication Date |
|---|---|
| CN101393322A true CN101393322A (en) | 2009-03-25 |
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| CNA2007102017219A Pending CN101393322A (en) | 2007-09-17 | 2007-09-17 | Stereo projection optical system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107948622A (en) * | 2013-06-25 | 2018-04-20 | 大日本印刷株式会社 | Grenade instrumentation and projection type image display apparatus |
| CN107991835A (en) * | 2017-11-15 | 2018-05-04 | 北京理工大学 | A kind of optical projection system and method |
| WO2019128097A1 (en) * | 2017-12-26 | 2019-07-04 | 广景视睿科技（深圳）有限公司 | 3d imaging system and apparatus thereof |
-
2007
- 2007-09-17 CN CNA2007102017219A patent/CN101393322A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107948622A (en) * | 2013-06-25 | 2018-04-20 | 大日本印刷株式会社 | Grenade instrumentation and projection type image display apparatus |
| CN107948622B (en) * | 2013-06-25 | 2019-09-10 | 大日本印刷株式会社 | Grenade instrumentation and projection type image display apparatus |
| CN107991835A (en) * | 2017-11-15 | 2018-05-04 | 北京理工大学 | A kind of optical projection system and method |
| CN107991835B (en) * | 2017-11-15 | 2019-10-25 | 北京理工大学 | Optical projection system and method are expanded based on micro-nano structure palarization multiplexing short focus |
| WO2019128097A1 (en) * | 2017-12-26 | 2019-07-04 | 广景视睿科技（深圳）有限公司 | 3d imaging system and apparatus thereof |
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Open date: 20090325 |