CN103048798B - A kind of specular removal optic modulating device and specular removal stereo projection system - Google Patents
A kind of specular removal optic modulating device and specular removal stereo projection system Download PDFInfo
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- CN103048798B CN103048798B CN201210589646.9A CN201210589646A CN103048798B CN 103048798 B CN103048798 B CN 103048798B CN 201210589646 A CN201210589646 A CN 201210589646A CN 103048798 B CN103048798 B CN 103048798B
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Abstract
The present invention is applicable to 3D projection display technique field, provides a kind of specular removal optic modulating device, comprises a polarized light splitting device, for incident light being divided into the orthogonal transmitted light beam of polarization state and folded light beam; Transmitted light beam light path comprises successively: First Line polarizer, the first one-quarter wavelength retardation film; Folded light beam light path comprises successively: for changing catoptron, the second linear polarizer, second one-quarter wavelength retardation film of the folded light beam direction of propagation; The light path of transmitted light beam or the light path of folded light beam are also provided with polarization direction switching device, lens/lens combination.The two-beam line that incident beam is divided into polarization state different by using the high polarized light splitting device of the little polarization conversion efficiency of dispersion by the present invention, re-use meander configuration liquid crystal device the polarization state of wherein Ray Of Light is adjusted, finally make the two-beam line in screen coincide together, increase the brightness of light utilization efficiency and projection display picture.
Description
Technical field
The invention belongs to 3D projection display technique field, particularly relate to a kind of specular removal optic modulating device and specular removal stereo projection system, the light of projector's light about about 70% can be converted to polarization light, thus the light utilization efficiency improving stereo projection apparatus increases the brightness of projected picture.
Background technology
Along with popularizing of three-dimensional film, stereo projection technology have also been obtained develop rapidly.Common cinematic movie projector is using xenon lamp as white-light emitting light source, and using the dmd chip of Texas Instrument as display chip, be referred to as DLP projector, the emergent ray of this kind of projector is nonpolarized light.Passive type three-dimensional film equipment is divided into single projector stereoscopic device and dual-projection machine stereo projecting equipment, and these two kinds of equipment all adopt the mode of point polarization to realize the separation of right and left eyes image, thus realize 3D effect.Tradition passive type three-dimensional film equipment generally all adopts and absorbs molded line polarizing device as polarizer part, and along with the expansion gradually of movie screen, the brightness of cinematic movie projector also progressively promotes.Traditional absorption-type linear polarization device, due to the restriction of principle of work, makes the luminous energy of nearly 60% be converted into heat on absorption-type linear polarization device; When using the cinematic movie projector of high brightness, the temperature of conventional suction molded line polarizer rises rapidly, and the aging speed of polarizer is accelerated, and optical property is obviously deteriorated, and time serious, absorption-type linear polarization device can burn by strong beam.Meanwhile, because absorption-type linear polarization device absorbs the luminous energy of nearly 60%, make the light utilization efficiency of whole stereo projection apparatus only maintain about 40%, projected picture brightness reduces greatly.In order to keep the brightness of large screen stereoprojection picture, movie theatre has to promote the power of xenon lamp, and this just makes xenon lamp brightness decay speed aggravate, and causes movie theatre maintenance cost to raise.
Summary of the invention
First technical matters to be solved by this invention is to provide a kind of specular removal optic modulating device, is intended to reduce the dispersion in polarization conversion process, increases the utilization factor of projection ray and the brightness of projection display picture.
The present invention is achieved in that a kind of specular removal optic modulating device, comprises a polarized light splitting device, for incident light being divided into the orthogonal transmitted light beam of polarization state and folded light beam;
In the light path of described transmitted light beam, described specular removal optic modulating device also comprises successively: First Line polarizer, the first one-quarter wavelength retardation film;
In the light path of described folded light beam, described specular removal optic modulating device also comprises successively: for changing catoptron, the second linear polarizer, second one-quarter wavelength retardation film of the folded light beam direction of propagation;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the polarization direction switching device for the polarization state of transmission/folded light beam being changed into perpendicular polarisation state, described polarization direction switching device can be positioned at First Line polarizer or the second linear polarizer before any position in light path;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the lens/lens combination for changing projected light beam size.
Further, the polarization axis direction of described First Line polarizer is identical with the polarization axis direction of described second linear polarizer, and described first one-quarter wavelength retardation film is identical with the retardation axis direction of described second one-quarter wavelength retardation film; The angle of the retardation axis of described first one-quarter wavelength retardation film and the polarization axle of described First Line polarizer is and the angle of the retardation axis of described second one-quarter wavelength retardation film and the polarization axle of described second linear polarizer is 45 degree or simultaneously for-45 spend simultaneously; Described first one-quarter wavelength retardation film and the second one-quarter wavelength retardation film are structure as a whole, and described First Line polarizer and the second linear polarizer are structure as a whole
Second technical matters to be solved by this invention is to provide a kind of specular removal stereo projection system, comprise a projector, a polarized light splitting device, described polarized light splitting device is used for the projection ray from projector to be divided into the orthogonal transmitted light beam of polarization state and folded light beam;
In the light path of described transmitted light beam, described specular removal stereo projection system also comprises successively: First Line polarizer, the first liquid crystal light valve-type photomodulator for the contrary circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted to according to the mode of frame sequential;
In the light path of described folded light beam, described specular removal stereo projection system also comprises successively: for changing the catoptron of the folded light beam direction of propagation, the second linear polarizer, the second liquid crystal light valve-type photomodulator for the contrary circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted to according to the mode of frame sequential;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the polarization direction switching device for the polarization state of transmission/folded light beam being changed into perpendicular polarisation state, described polarization direction switching device can be positioned at the first liquid crystal light valve-type photomodulator/the second liquid crystal light valve-type photomodulator before any position in light path;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the lens/lens combination for changing projected light beam size.
Further, described polarization direction switching device is meander configuration liquid crystal device.
Further, when described lens/lens combination is positioned at reflected light path, described lens/lens combination is positioned at any position before the second linear polarizer;
Described transmitted light path also comprises image space for making transmitted light beam on the metal curtain prism wedge to the direction translation of the image space of folded light beam on metal curtain; The angle that the reflecting surface of described catoptron is placed can make the image space of transmitted light beam on metal curtain of the image space of folded light beam on metal curtain and described prism wedge effect coincide; Described prism wedge is positioned at any position before described First Line polarizer.
Further, when described lens/lens combination is positioned at transmitted light path, described lens/lens combination is positioned at any position before First Line polarizer;
Described transmitted light path also comprises image space for making transmitted light beam on the metal curtain prism wedge to the direction translation of the image space of folded light beam on metal curtain; The angle that the reflecting surface of described catoptron is placed can make the image space of transmitted light beam on metal curtain of the image space of folded light beam on metal curtain and described prism wedge effect coincide; After described prism wedge is positioned at any position before described First Line polarizer it is positioned at described lens/lens combination.
Further, the polarization axis direction of described First Line polarizer is identical with the polarization axis direction of described second linear polarizer, described first liquid crystal light valve-type photomodulator and the second liquid crystal light valve-type photomodulator circularly polarized light that output polarization state is identical at one time.
Further, first liquid crystal light valve-type photomodulator and the second liquid crystal light valve-type photomodulator are structure as a whole, described First Line polarizer and the second linear polarizer are also structure as a whole, and the first one-quarter wavelength retardation film and the second one-quarter wavelength retardation film are also structure as a whole.
The present invention compared with prior art, by the two-beam line using polarized light splitting device to be divided into polarization state different incident beam, re-use meander configuration liquid crystal device the polarization state of wherein Ray Of Light is adjusted, make it consistent with the polarization state of another Ray Of Light, and use catoptron that the folded light beam of polarizing beam splitter is adjusted to the light beam consistent with former incident beam direction, thus in screen, two-beam line is coincided together, increase the brightness of light utilization efficiency and projection display picture.
Accompanying drawing explanation
Fig. 1 is the optical structure chart of a kind of specular removal stereo projection system provided by the invention;
Fig. 2 is the optical structure chart of another kind of specular removal stereo projection system provided by the invention;
Fig. 3 be use meander configuration liquid crystal device provided by the invention with when using half-wave plate through spectrum comparison diagram;
Fig. 4 be 1/2 wave retardation film provided by the invention with and meander configuration liquid crystal device be placed between two parallel polaroids through spectrogram;
Fig. 5 is a kind of specular removal optic modulating device optical structure chart provided by the invention;
Fig. 6 is another kind of specular removal optic modulating device optical structure chart provided by the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to Fig. 1, specular removal stereo projection system provided by the invention comprises projector 101, polarized light splitting device 102, lens or lens combination 103 First Line polarizer 105 and the second linear polarizer 109, first liquid crystal light valve-type photomodulator 106 and the second liquid crystal light valve-type photomodulator 110, polarization direction switching device, catoptron 108, metal curtain 111, also can comprise prism wedge 104 further.The principle of work of each part mentioned above is as follows.
Projector 101 plays left-eye image and eye image successively with frame sequential, and the light beam sent from the camera lens of projector 101 is divided into the main beam 112 of transmission and the secondary light beam 113 of reflection after polarizing beam splitter 102.Main beam 112 is mutually vertical with the polarization state of time light beam 113.The function of lens or lens combination 103 is carried out expanding or reducing by the light beam of place light path, to make it with other light beam formed image in screen 111 in the same size.Lens in Fig. 1 or lens combination 103 have been placed in main beam, and object is expanded by main beam, equally also can be placed in time light beam 113.Prism wedge 104, for being deflected by the image of main beam, makes the image of main beam to the image translation of secondary light beam.Consider light axis consistency problem, generally prism wedge 104 be placed on after lens or lens combination 103, make light first through lens or lens combination 103 again through prism wedge 104.First Line polarizer 105, for being filtered by the light beam 112 through polarized light splitting device 102, makes its polarization state more consistent, becomes desired polarization light; Linearly polarized light, for adjusting linearly polarized light, is adjusted to left circularly polarized light and right-circularly polarized light according to the mode of frame sequential by the first liquid crystal light valve-type photomodulator 106 respectively, thus makes right and left eyes image reach the effect of separation.
Folded light beam Lu Jingzhong in fig. 1, polarization direction switching device 107 is placed in time light beam, for the polarization state 90-degree rotation by light beam, makes it identical with the polarization state of other Ray Of Light.In fact, polarization direction switching device 107 also can be placed in main beam, as long as before First Line polarizer 105.
Catoptron 108, for changing the radiation direction of time light beam, makes it consistent with the direction of main beam, and can adjust the angle of catoptron 108, make secondary light beam in screen 111 become image to overlap with the image of main beam.Second linear polarizer 109, for being filtered by the polarization state through the postrotational light beam of meander configuration liquid crystal device, makes its polarization state more consistent, becomes desired polarization light; Linearly polarized light, for adjusting linearly polarized light, is adjusted to left circularly polarized light and right-circularly polarized light according to the mode of frame sequential by the second liquid crystal light valve-type photomodulator 110 respectively, thus makes right and left eyes image reach the effect of separation; Second linear polarizer 109 is consistent with the polarization axis direction of First Line polarizer 105.
Because light path is reversible, lens/lens combination 103 and prism wedge 104 can be placed between polarized light splitting device 102 and First Line polarizer 105, also can be placed between linear polarizer 105 and metal curtain 111; But in order to avoid reflextion from lens surface is on the impact of polarization state, lens/lens combination 103 and prism wedge 104 are placed between polarized light splitting device 102 and First Line polarizer 105 usually.In addition, lens/lens combination 103 also can be placed in time light beam and reflected light path, as long as before the second linear polarizer 109.
Equally, in the secondary light beam in embodiment one, meander configuration liquid crystal device 107 also can be placed between catoptron 108 and the second linear polarizer 109, and its effect does not change.
Second liquid crystal light valve-type photomodulator 110 is synchronoused working with the first liquid crystal light valve-type photomodulator 106, the polarization state of the circularly polarized light produced after both modulation is consistent, such as export left circularly polarized light at current time, and subsequent time exports right-circularly polarized light simultaneously simultaneously.Light after the second liquid crystal light valve-type photomodulator 110 and the first liquid crystal light valve-type photomodulator 106 are modulated, be incident upon on metal curtain 111, metal curtain 111 can carry out imaging to main beam and secondary light beam, the light be irradiated on metal curtain 111 is reflected with contrary polarization state simultaneously, thus make light before entering into the rotatory polarization glasses of viewers wear, still keep the separation of right and left eyes image, do not produce the crosstalk of left images.
Namely viewers wear circular polarization glasses can be observed stereopsis in screen front, the right and left eyes eyeglass of circular polarization glasses is respectively Left-hand circular polarization sheet and right-hand circular polarization sheet, can be separated the light of screen reflection, make the image entering into right and left eyes different, thus reach the object of right and left eyes separation of images.
In embodiment one, First Line polarizer 105 and the second linear polarizer 109 are as two independently parts, also integral structure can be adopted in the specific implementation, namely a large-sized linear polarization device is used to replace linear polarization device 105 and 109, such as, linear polarization device 205 shown in accompanying drawing 2; Same, liquid crystal light valve-type photomodulator 110 and liquid crystal light valve-type photomodulator 106 be two independently parts in embodiment one, also a large-sized liquid crystal light valve-type photomodulator can be used in the specific implementation to replace 106 and 109, such as, liquid crystal light valve-type photomodulator 206 shown in Fig. 2; Large-sized linear polarizer 205 and large-sized liquid crystal light valve-type photomodulator 206 can contain main beam and time light beam.
In the present invention, it is consistent with the polarization state of transmitted light beam that polarization direction switching device 107 adopts meander configuration liquid crystal device to realize folded light beam, meander configuration liquid crystal device 107 is generally the TN type liquid crystal device of 90 degree of distortions, incide the polarization of light direction of meander configuration liquid crystal device 107 parallel with the orientation of meander configuration liquid crystal device 107 liquid crystal layer surface molecules or vertical time, the polarization of light state after meander configuration liquid crystal device 107 will be rotated by 90 degrees.Improve the retardation of meander configuration liquid crystal device 107, contribute to obtaining better polarization state.Also adopting useful device in prior art is that 1/2 wave retardation film realizes, although 1/2 wave retardation film can reach the effect of rotatory polarization light polarization direction, but the dispersion due to phase shift films can cause the color in certain wavelength coverage to lose, thus causes the imaging picture color of projection to offset; Simultaneously due to cannot by complete for the direction of polarized light 90-degree rotation, need to use extra linear polarization device to filter postrotational linearly polarized light, some luminous energy is made to consume on the linear polarization device filtered, both lost light utilization efficiency, and turn increased the linear polarization device absorption luminous energy filtered and aging possibility occurs.And the meander configuration liquid crystal device 107 that the present invention adopts is as the rotary device of polarized light polarization direction, there is dispersion little, polarized light rotation efficiency advantages of higher, in accompanying drawing 3 curve 301 be meander configuration liquid crystal device of the present invention be placed between two orthogonal polaroids through spectrum, curve 302 be 1/2 wave retardation film with miter angle degree be placed between two orthogonal polaroids through spectrum, can find out in blue-violet light wavelength coverage and red wavelengths, 1/2 wave retardation film through light color deflection yellow green, larger on picture color impact, and when using meander configuration liquid crystal device, the light penetration of each wavelength is all higher than 1/2 wave retardation film, and therefore the transmittance of meander configuration liquid crystal device is higher, give the chromaticity coordinate of two curves in Fig. 3 and the color displacement amount relative to ideal white light source in table 1, can find out use meander configuration liquid crystal device time color substantially remain near white, color displacement amount is very little, and use color displacement amount during 1/2 wave retardation film be use meander configuration liquid crystal device time 4.2 times.When calculating color displacement amount, x, y are source chromaticity coordinate value, x ', y ' be the chromaticity coordinate value after use 1/2 wave retardation film or meander configuration liquid crystal device.
In Fig. 4 curve 401 be 1/2 wave retardation film with miter angle degree be placed between two parallel polaroids through spectrum, curve 402 be meander configuration liquid crystal device of the present invention be placed between two parallel polaroids through spectrum, can find out in bluish violet and red wavelength range, transmitance is higher, light namely in bluish violet and red wavelength range cannot by 1/2 wave retardation film 90-degree rotation polarization direction, on optical device below, this wave band light will be filtered, thus make picture can lose the color of this part, produce the skew of picture color.And during the meander configuration liquid crystal device using this use novel provided, the linearly polarized light in nearly all wavelength coverage will be rotated by 90 degrees, and therefore can ensure that larger skew does not occur picture color.
Meander configuration liquid crystal device 107 can be traditional liquid crystal device based on glass substrate, is made up of glass substrate, transparency conducting layer, oriented layer, sept, edging material, liquid crystal material etc.; Also can be the liquid crystal device based on flexible plastic substrates, be made up of plastic base, transparency conducting layer, oriented layer, sept, edging material, liquid crystal material etc.; Can also be the Polymer Liquid Crystals Composites Membrane based on polymer technology, the TwistarTM film of such as DEJIMA company; Will be understood that the scope that there is twist structured liquid crystal device and all belong to described in the invention.
In addition, because the light path of secondary beam path is than the optical length of main optical path, therefore can have a displacement relative to the image of main beam at the image of screen light beam last time, the distance of displacement equals polarized light splitting device center and mirror center distance, cannot overlap.In order to solve the upper-lower position COINCIDENCE PROBLEMS of image in primary and secondary light path, having and adopting the mode of adjustment mirror angle to realize in prior art, but this kind of adjustment mode is owing to only adjusting time light beam, the trapezoidal deformation of generation is larger; The regulative mode that the present invention proposes adopts two kinds of devices to regulate primary and secondary light beam respectively, and the image space of transmitted light beam on metal curtain that the angle requiring the reflecting surface of catoptron 108 to place can make the image space of folded light beam on metal curtain and prism wedge 104 act on coincides.Particularly, for main beam, the present invention adopts prism wedge to adjust light beam, makes the image of main beam move the shift length of about half to secondary light beam image; In secondary light beam, adopt the mode of adjustment mirror angle to be drawn close to main beam picture by the picture of secondary light beam in screen of reflection, displacement is also about the shift length of half; By adjusting respectively primary and secondary light beam, the keystone distortion occurred when only adjusting a light path can be reduced, contributing to the sharpness improving coincidence picture.
The present invention also can use as optic modulating device, as shown in Figure 5, Figure 6, do not comprise projector 101 and metal curtain 111 with Fig. 1 unlike optic modulating device in Fig. 5, and adopt the first one-quarter wavelength retardation film 506 and the second one-quarter wavelength retardation film 510 to replace the first liquid crystal light valve-type photomodulator 106 and the second liquid crystal light valve-type photomodulator 110.The device of remainder and position relationship each other and principle of work all identical with Fig. 1.
Same, can be replaced by a large-sized linear polarizer with First Line polarizer 105 and the second linear polarizer 109, the first one-quarter wavelength retardation film 506 and the second one-quarter wavelength retardation film 510 also can be replaced by a large-sized one-quarter wavelength retardation film in figure 6.
In actual use, general use Liang Tai projector plays left eye picture and right eye picture respectively, two specular removal optic modulating devices provided by the invention are placed on respectively the camera lens front of Liang Tai projector, linear polarizer in two specular removal optic modulating devices and the angle of one-quarter wavelength retardation film can be positive 45 degree or-45 to spend simultaneously simultaneously, 45 degree of corresponding left circularly polarized lights ,-45 degree then corresponding right-handed polarized light.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a specular removal optic modulating device, is characterized in that, comprises a polarized light splitting device, for incident light being divided into the orthogonal transmitted light beam of polarization state and folded light beam;
In the light path of described transmitted light beam, described specular removal optic modulating device also comprises successively: prism wedge, First Line polarizer, the first one-quarter wavelength retardation film;
In the light path of described folded light beam, described specular removal optic modulating device also comprises successively: for changing catoptron, the second linear polarizer, second one-quarter wavelength retardation film of the folded light beam direction of propagation;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the polarization direction switching device for the polarization state of transmission/folded light beam being changed into perpendicular polarization state, described polarization direction switching device can be positioned at First Line polarizer or the second linear polarizer before any position in light path;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the lens/lens combination for changing projected light beam size;
Described prism wedge moves the distance of half for making the image space of transmitted light beam to the image space of folded light beam, and described catoptron moves the distance of remaining half for making the image space of folded light beam to the image space of transmitted light beam.
2. specular removal optic modulating device as claimed in claim 1, it is characterized in that, described polarization direction switching device is meander configuration liquid crystal device.
3. specular removal optic modulating device as claimed in claim 1, it is characterized in that, when described lens/lens combination is positioned at reflected light path, described lens/lens combination is positioned at any position before the second linear polarizer.
4. specular removal optic modulating device as claimed in claim 1, it is characterized in that, when described lens/lens combination is positioned at transmitted light path, described lens/lens combination is positioned at any position before First Line polarizer;
After described prism wedge is positioned at any position before described First Line polarizer it is positioned at described lens/lens combination.
5. specular removal optic modulating device as claimed in claim 1, it is characterized in that, the polarization axis direction of described First Line polarizer is identical with the polarization axis direction of described second linear polarizer, and described first one-quarter wavelength retardation film is identical with the retardation axis direction of described second one-quarter wavelength retardation film; The angle of the polarization axle of the angle of the retardation axis of described first one-quarter wavelength retardation film and the polarization axle of described First Line polarizer and the retardation axis of described second one-quarter wavelength retardation film and described second linear polarizer is 45 degree or simultaneously for-45 spend simultaneously; Described first one-quarter wavelength retardation film and the second one-quarter wavelength retardation film are structure as a whole, and described First Line polarizer and the second linear polarizer are also structure as a whole.
6. a specular removal stereo projection system, is characterized in that, comprises a projector, a polarized light splitting device, and described polarized light splitting device is used for the projection ray from projector to be divided into the orthogonal transmitted light beam of polarization state and folded light beam;
In the light path of described transmitted light beam, described specular removal stereo projection system also comprises successively: prism wedge, First Line polarizer, the first liquid crystal light valve-type photomodulator for the contrary circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted to according to the mode of frame sequential;
In the light path of described folded light beam, described specular removal stereo projection system also comprises successively: for changing the catoptron of the folded light beam direction of propagation, the second linear polarizer, the second liquid crystal light valve-type photomodulator for the contrary circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted to according to the mode of frame sequential;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the polarization direction switching device for the polarization state of transmission/folded light beam being changed into perpendicular polarization state, described polarization direction switching device can be positioned at the first liquid crystal light valve-type photomodulator/the second liquid crystal light valve-type photomodulator before any position in light path;
The light path of described transmitted light beam or the light path of described folded light beam are also provided with the lens/lens combination for changing projected light beam size;
Described prism wedge moves the distance of half for making the image space of transmitted light beam to the image space of folded light beam, and described catoptron moves the distance of remaining half for making the image space of folded light beam to the image space of transmitted light beam.
7. specular removal stereo projection system as claimed in claim 6, it is characterized in that, described polarization direction switching device is meander configuration liquid crystal device.
8. specular removal stereo projection system as claimed in claim 6, it is characterized in that, when described lens/lens combination is positioned at reflected light path, described lens/lens combination is positioned at any position before the second linear polarizer.
9. specular removal stereo projection system as claimed in claim 6, it is characterized in that, when described lens/lens combination is positioned at transmitted light path, described lens/lens combination is positioned at any position before First Line polarizer; After described prism wedge is positioned at any position before described First Line polarizer it is positioned at described lens/lens combination.
10. specular removal stereo projection system as claimed in claim 6, it is characterized in that, the polarization axis direction of described First Line polarizer is identical with the polarization axis direction of described second linear polarizer, described first liquid crystal light valve-type photomodulator and the second liquid crystal light valve-type photomodulator circularly polarized light that output polarization state is identical at one time; Described first liquid crystal light valve-type photomodulator and the second liquid crystal light valve-type photomodulator are structure as a whole, and described First Line polarizer and the second linear polarizer are also structure as a whole.
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| CN203025425U (en) * | 2012-12-29 | 2013-06-26 | 深圳市时代华影科技开发有限公司 | High-luminous-efficiency light modulating device and high-luminous-efficiency stereographic projection system |
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| CN101688940A (en) * | 2007-05-09 | 2010-03-31 | 瑞尔·D公司 | Polarization conversion system and method for stereoscopic projection |
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