CN103048798A - High-light-efficiency light modulation device and high-light-efficiency (3-dimensional) 3D projection system - Google Patents
High-light-efficiency light modulation device and high-light-efficiency (3-dimensional) 3D projection system Download PDFInfo
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Abstract
The invention provides a high-light-efficiency light modulation device and is applicable to the technical field of 3D (3-dimensional) projection display. The high-light-efficiency light modulation device comprises a polarization light splitting device, wherein the polarization light splitting device is used for splitting incident light into a transmission light beam and a reflection light beam with mutually vertical polarization states, a first liner polarizer and a first quarter wavelength delay membrane are sequentially arranged on a transmission light beam light path, a reflector, a second linear polarizer and a second quarter delay membrane are sequentially arranged on a reflection light beam light path, the reflector is used for changing the spread direction of the reflection light beam, and a polarization direction converting device and a lens/ lens group are also arranged on the transmission light beam light path or the reflection light beam light path. The high-light-efficiency light modulation device has the advantages that the polarization light splitting device with small chromatic dispersion and high polarization converting efficiency is used for splitting the incident light into two beams of light rays with different polarization states, then, a twisted liquid crystal device is used for regulating the polarization state of one beam of light ray, finally, two beams of light rays on a projection screen are coincided, and the light utilization rate and the brightness of the projection display frame are improved.
Description
Technical field
The invention belongs to 3D projection display technique field, relate in particular to a kind of high light efficiency optic modulating device and high light efficiency stereo projection system, can with projector's light approximately about 70% light be converted to polarization light, thereby the light utilization efficiency that improves stereo projection apparatus increases the brightness of projected picture.
Background technology
Along with popularizing of three-dimensional film, stereo projection technology has also obtained develop rapidly.Common motion-picture projection machine as the white-light emitting light source, as display chip, is referred to as DLP projector with the dmd chip of Texas Instrument with xenon lamp, and the emergent ray of this class 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 minute polarization to realize the separation of right and left eyes image, thereby realize 3D effect.Tradition passive type three-dimensional film equipment generally all adopts and absorbs the molded line polarizing device as polarizer spare, and along with the gradually expansion of movie screen, the brightness of motion-picture projection machine also progressively promotes.Traditional absorption-type linear polarization device is owing to the restriction of principle of work, so that nearly 60% luminous energy is converted into heat at absorption-type linear polarization device; When using the motion-picture projection machine of high brightness, the temperature of traditional absorption-type linear polarization device rises rapidly, so that the quickening of the aging speed of polarizer, the obvious variation of optical property, strong beam can burn absorption-type linear polarization device when serious.Simultaneously, because absorption-type linear polarization device has absorbed nearly 60% luminous energy, so that the light utilization efficiency of whole stereo projection apparatus only maintains 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 is just so that the aggravation of xenon lamp brightness decay speed causes the 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 high light efficiency optic modulating device, is intended to reduce the dispersion in the 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 high light efficiency optic modulating device, comprises a polarized light splitting device, is used for incident light is divided into the orthogonal transmitted light beam of polarization state and folded light beam;
On the light path of described transmitted light beam, described high light efficiency optic modulating device also comprises successively: First Line polarizer, the first one-quarter wavelength retardation film;
On the light path of described folded light beam, described high light efficiency optic modulating device also comprises successively: the catoptron, the second linear polarizer, the second one-quarter wavelength retardation film that are used for changing the folded light beam direction of propagation;
Also be provided with the polarization direction switching device that changes the vertical polarization attitude for the polarization state with transmission/folded light beam on the light path of the light path of described transmitted light beam or described folded light beam, described polarization direction switching device can be positioned at the arbitrary position on the light path before First Line polarizer or the second linear polarizer;
On the light path of the light path of described transmitted light beam or described folded light beam, also be provided with for the lens/lens combination that changes the projected light beam size.
Further, the polarization axis direction of described First Line polarizer is identical with the polarization axis direction of described the second linear polarizer, and described the first one-quarter wavelength retardation film is identical with the retardation axis direction of the described film of the second quarter-wave long delay; The angle of the polarization axle of the retardation axis of described the first one-quarter wavelength retardation film and described First Line polarizer is and the angle of the polarization axle of the retardation axis of described the second one-quarter wavelength retardation film and described the second linear polarizer is 45 degree or-45 degree simultaneously simultaneously; Described the 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 high light efficiency stereo projection system, comprise a projector, a polarized light splitting device, described polarized light splitting device is used for being divided into from the projection ray of projector the orthogonal transmitted light beam of polarization state and folded light beam;
On the light path of described transmitted light beam, described high light efficiency stereo projection system also comprises successively: the First Line polarizer, be used for the first liquid crystal light valve type photomodulator of the opposite circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted into according to the mode of frame sequential;
On the light path of described folded light beam, described high light efficiency stereo projection system also comprises successively: be used for to change the folded light beam direction of propagation catoptron, the second linear polarizer, be used for the second liquid crystal light valve type photomodulator of the opposite circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted into according to the mode of frame sequential;
Also be provided with the polarization direction switching device that changes the vertical polarization attitude for the polarization state with transmission/folded light beam on the light path of the light path of described transmitted light beam or described folded light beam, described polarization direction switching device can be positioned at the arbitrary position on the light path before the first liquid crystal light valve type photomodulator/second liquid crystal light valve type photomodulator;
On the light path of the light path of described transmitted light beam or described folded light beam, also be provided with for the lens/lens combination that changes the projected light beam size.
Further, described polarization direction switching device is the meander configuration liquid crystal device.
Further, when described lens/lens combination was positioned at reflected light path, described lens/lens combination was positioned at the arbitrary position before the second linear polarizer;
Also comprise on the described transmitted light path be used to making transmitted light beam at the prism wedge of the image space on the metal curtain 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 folded light beam coincide at the image space of transmitted light beam on metal curtain of the image space on the metal curtain and described prism wedge effect; Described prism wedge is positioned at the arbitrary position before the described First Line polarizer.
Further, when described lens/lens combination was positioned at transmitted light path, described lens/lens combination was positioned at the arbitrary position before the First Line polarizer;
Also comprise on the described transmitted light path be used to making transmitted light beam at the prism wedge of the image space on the metal curtain 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 folded light beam coincide at the image space of transmitted light beam on metal curtain of the image space on the metal curtain and described prism wedge effect; Described prism wedge is positioned at described First Line polarizer arbitrary position before, and it is positioned at after described lens/lens combination.
Further, the polarization axis direction of described First Line polarizer is identical with the polarization axis direction of described the second linear polarizer, described the 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, the 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 also are structure as a whole, and the first one-quarter wavelength retardation film and the second one-quarter wavelength retardation film also are structure as a whole.
The present invention compared with prior art, by using polarized light splitting device that incident beam is divided into the different two-beam line of polarization state, re-use the meander configuration liquid crystal device will be wherein the polarization state of Ray Of Light adjust, make it consistent with the polarization state of another bundle 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, thereby in screen, the two-beam line is coincided together, increase the brightness of light utilization efficiency and projection display picture.
Description of drawings
Fig. 1 is the optical structure chart of a kind of high light efficiency stereo projection system provided by the invention;
Fig. 2 is the optical structure chart of the high light efficiency stereo projection system of another kind provided by the invention;
Fig. 3 is use meander configuration liquid crystal device provided by the invention when using half-wave plate sees through the spectrum comparison diagram;
Fig. 4 be 1/2 wavelength phase shift films provided by the invention with and the meander configuration liquid crystal device be placed on the spectrogram that sees through between two parallel polaroids;
Fig. 5 is a kind of high light efficiency optic modulating device optical structure chart provided by the invention;
Fig. 6 is the high light efficiency optic modulating device of another kind provided by the invention optical structure chart.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
With reference to Fig. 1, high light efficiency stereo projection system provided by the invention comprises projector 101, polarized light splitting device 102, lens or lens combination 103 First Line polarizers 105 and the second linear polarizer 109, the 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 further comprise prism wedge 104.The principle of work of each part mentioned above is as follows.
Folded light beam Lu Jingzhong in accompanying drawing 1, polarization direction switching device 107 are placed in time light beam, are used for the polarization state 90-degree rotation with light beam, make it identical with the polarization state of other Ray Of Light.In fact, polarization direction switching device 107 also can be placed in the main beam, as long as before First Line polarizer 105.
Catoptron 108 is used 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 time light beam in screen 111 become image to overlap with the image of main beam.The second linear polarizer 109 is used for and will filters through the polarization state of the postrotational light beam of meander configuration liquid crystal device, makes its polarization state more consistent, becomes desired polarization light; The second liquid crystal light valve type photomodulator 110 is used for linearly polarized light is adjusted, and according to the mode of frame sequential linearly polarized light is adjusted into respectively left circularly polarized light and right-circularly polarized light, thereby makes the right and left eyes image reach the effect of separation; The second linear polarizer 109 is consistent with the polarization axis direction of First Line polarizer 105.
Reversible because of light path, can be placed between lens/lens combination 103 and the prism wedge 104 between polarized light splitting device 102 and the First Line polarizer 105, also can be placed between linear polarizer 105 and the metal curtain 111; But for fear of the impact of reflextion from lens surface on polarization state, lens/lens combination 103 and prism wedge 104 are placed between polarized light splitting device 102 and the First Line polarizer 105 usually.In addition, it is in the reflected light path that lens/lens combination 103 also can be placed on time light beam, as long as before the second linear polarizer 109.
Equally, in the inferior 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.
The second liquid crystal light valve type photomodulator 110 is synchronoused working with the first liquid crystal light valve type photomodulator 106, consistent through the circular polarization polarized state of light that produces after both modulation, for example export simultaneously left circularly polarized light at current time, and next exports right-circularly polarized light constantly simultaneously.Through the light after the second liquid crystal light valve type photomodulator 110 and 106 modulation of the first liquid crystal light valve type photomodulator, be incident upon on the metal curtain 111, metal curtain 111 can carry out imaging to main beam and time light beam, the light that will shine simultaneously on the metal curtain 111 reflects with opposite polarization state, thereby make light entering into the separation that still keeps the right and left eyes image before the rotatory polarization glasses of viewers wear, do not produce crosstalking of left and right sides image.
Viewers wear circular polarization glasses namely can be observed stereopsis in screen the place ahead, the right and left eyes eyeglass of circular polarization glasses is respectively Left-hand circular polarization sheet and right-hand circular polarization sheet, can the light of screen reflection be separated, make the image that enters into right and left eyes different, thereby reach the purpose of right and left eyes separation of images.
In embodiment one, First Line polarizer 105 and the second linear polarizer 109 are as two parts independently, also can adopt integral structure in the specific implementation, namely use a large-sized linear polarization device to replace linear polarization device 105 and 109, example linear polarization device 205 as shown in Figure 2; Same, liquid crystal light valve type photomodulator 110 and liquid crystal light valve type photomodulator 106 be two parts independently in embodiment one, also can use in the specific implementation a large-sized liquid crystal light valve type photomodulator to replace 106 and 109, for example the 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 be contained main beam and time light beam.
Among the present invention, polarization direction switching device 107 adopts the meander configuration liquid crystal device to realize that the polarization state of folded light beam and transmitted light beam is consistent, meander configuration liquid crystal device 107 is generally the TN type liquid crystal device of 90 degree distortions, incide the polarization of light direction of meander configuration liquid crystal device 107 when parallel or vertical with the orientation of meander configuration liquid crystal device 107 liquid crystal layer top layer molecules, will be rotated by 90 degrees through the polarization of light state behind the meander configuration liquid crystal device 107.Improve the retardation of meander configuration liquid crystal device 107, help to obtain better polarization state.Also adopting useful device in the prior art is that 1/2 wavelength phase shift films is realized, although 1/2 wavelength phase shift films can reach the effect of rotatory polarization light polarization direction, but because the dispersion meeting of phase shift films causes the color loss in certain wavelength coverage, thereby cause the imaging picture color of projection to be offset; Simultaneously because can't be with the complete 90-degree rotation of polarization direction of light, need to use extra linear polarization device that postrotational linearly polarized light is filtered, so that some luminous energy consumes on the linear polarization device that filters usefulness, both lost light utilization efficiency, and increased again the linear polarization device that filters usefulness and absorbed the aging possibility of luminous energy generation.And the meander configuration liquid crystal device 107 that the present invention adopts is as the rotary device of polarized light polarization direction, has dispersion little, polarized light rotation efficiency advantages of higher, curve 301 is placed on the spectrum that sees through between two polaroids of quadrature in the accompanying drawing 3 for meander configuration liquid crystal device of the present invention, curve 302 is that 1/2 wavelength phase shift films is placed on the spectrum that sees through between two polaroids of quadrature with the miter angle degree, can find out in the blue-violet light wavelength coverage and the red light wavelength, the light color that sees through of 1/2 wavelength phase shift films is partial to yellow green, and is larger on the picture color impact; And when using the meander configuration liquid crystal device, the light penetration of each wavelength all is higher than 1/2 wavelength phase shift films, so the transmittance of meander configuration liquid crystal device is higher; Provided the chromaticity coordinate of two curves among Fig. 3 in the table 1 and with respect to the color displacement amount of ideal white light source, can find out that color remains near the white substantially when using the meander configuration liquid crystal device, the color displacement amount is very little; And the color displacement amount when using 1/2 wavelength phase shift films is 4.2 times when using the meander configuration liquid crystal device.X, y are the source chromaticity coordinate value when calculating the color displacement amount, and x ', y ' are the chromaticity coordinate value behind use 1/2 wavelength phase shift films or the meander configuration liquid crystal device.
To be 1/2 wavelength phase shift films be placed on the spectrum that sees through between two parallel polaroids with the miter angle degree to curve 401 among Fig. 4, curve 402 is that meander configuration liquid crystal device of the present invention is placed on the spectrum that sees through between two parallel polaroids, can find out in bluish violet and red wavelength range, transmitance is higher, namely the light in bluish violet and red wavelength range can't be by 1/2 wavelength phase shift films 90-degree rotation polarization direction, this wave band light will be filtered bar on the optical device of back, thereby so that picture can be lost the color of this part, produce the skew of picture color.And when the novel meander configuration liquid crystal device that provides of this use was provided, the linearly polarized light in nearly all wavelength coverage will be rotated by 90 degrees, and therefore can guarantee 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 comprised of glass substrate, transparency conducting layer, oriented layer, sept, edging material, liquid crystal material etc.; Also can be based on the liquid crystal device of flexible plastic substrates, be formed by plastic base, transparency conducting layer, oriented layer, sept, edging material, liquid crystal material etc.; Can also be based on the Polymer Liquid Crystals Composites Membrane of polymer technology, for example the TwistarTM film of DEJIMA company; Will be understood that having twist structured liquid crystal device all belongs to scope described in the invention.
In addition, because the light path of time beam path is than the optical length of main optical path, therefore the image at screen light beam last time can have with respect to the image of main beam a displacement, and the distance of displacement equals polarized light splitting device center and catoptron centre distance, can't overlap.In order to solve the upper-lower position COINCIDENCE PROBLEMS of image in the primary and secondary light path, have mode that adopt to adjust mirror angle to realize in the prior art, but this kind adjustment mode is owing to only adjusting the primary and secondary light beam, the trapezoidal deformation of generation is larger; The regulative mode that the present invention proposes adopts two kinds of devices respectively the primary and secondary light beam to be regulated, and the angle that requires the reflecting surface of catoptron 108 to place can make folded light beam coincide at the image space of transmitted light beam on metal curtain that the image space on the metal curtain and prism wedge 104 acted on.Particularly, for main beam, the present invention adopts prism wedge that light beam is adjusted, and makes the image of main beam move the approximately shift length of half to inferior light beam image; In inferior light beam, the picture of inferior light beam in screen that the mode of employing adjustment mirror angle will reflect drawn close to the main beam picture, and displacement also is about the shift length of half; By the primary and secondary light beam is adjusted respectively, can reduce the keystone distortion that occurs when only adjusting a light path, help to improve the sharpness that overlaps picture.
The present invention also can be used as optic modulating device and uses, such as Fig. 5, shown in Figure 6, different from Fig. 1 among Fig. 5 is that optic modulating device does not comprise projector 101 and metal curtain 111, and adopts 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 are 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, in Fig. 6, 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 actual use, two projectors of normal operation play respectively left eye picture and right eye picture, two high light efficiency optic modulating devices provided by the invention are placed on respectively camera lens the place ahead of two projectors, linear polarizer in two high light efficiency optic modulating devices and the angle of one-quarter wavelength retardation film can be positive 45 degree or-45 degree simultaneously simultaneously, the corresponding left circularly polarized light of 45 degree ,-45 degree are corresponding right-handed polarized light then.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind high light efficiency optic modulating device is characterized in that, comprises a polarized light splitting device, is used for incident light is divided into the orthogonal transmitted light beam of polarization state and folded light beam;
On the light path of described transmitted light beam, described high light efficiency optic modulating device also comprises successively: First Line polarizer, the first one-quarter wavelength retardation film;
On the light path of described folded light beam, described high light efficiency optic modulating device also comprises successively: the catoptron, the second linear polarizer, the second one-quarter wavelength retardation film that are used for changing the folded light beam direction of propagation;
Also be provided with the polarization direction switching device that changes the vertical polarization attitude for the polarization state with transmission/folded light beam on the light path of the light path of described transmitted light beam or described folded light beam, described polarization direction switching device can be positioned at the arbitrary position on the light path before First Line polarizer or the second linear polarizer;
On the light path of the light path of described transmitted light beam or described folded light beam, also be provided with for the lens/lens combination that changes the projected light beam size.
2. high light efficiency optic modulating device as claimed in claim 1 is characterized in that, described polarization direction switching device is the meander configuration liquid crystal device.
3. high light efficiency optic modulating device as claimed in claim 1 is characterized in that, when described lens/lens combination was positioned at reflected light path, described lens/lens combination was positioned at the arbitrary position before the second linear polarizer;
Also comprise on the described transmitted light path be used to making transmitted light beam at the prism wedge of the image space on the metal curtain 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 folded light beam coincide at the image space of transmitted light beam on metal curtain of the image space on the metal curtain and described prism wedge effect; Described prism wedge is positioned at the arbitrary position before the described First Line polarizer.
4. high light efficiency optic modulating device as claimed in claim 1 is characterized in that, when described lens/lens combination was positioned at transmitted light path, described lens/lens combination was positioned at the arbitrary position before the First Line polarizer;
Also comprise on the described transmitted light path be used to making transmitted light beam at the prism wedge of the image space on the metal curtain 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 folded light beam coincide at the image space of transmitted light beam on metal curtain of the image space on the metal curtain and described prism wedge effect; Described prism wedge is positioned at described First Line polarizer arbitrary position before, and it is positioned at after described lens/lens combination.
5. high light efficiency 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 the second linear polarizer, and described the first one-quarter wavelength retardation film is identical with the retardation axis direction of the described film of the second quarter-wave long delay; The angle of the polarization axle of the retardation axis of described the first one-quarter wavelength retardation film and described First Line polarizer is and the angle of the polarization axle of the retardation axis of described the second one-quarter wavelength retardation film and described the second linear polarizer is 45 degree or-45 degree simultaneously simultaneously; Described the 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 also are structure as a whole.
6. one kind high light efficiency stereo projection system is characterized in that, comprises a projector, a polarized light splitting device, and described polarized light splitting device is used for being divided into from the projection ray of projector the orthogonal transmitted light beam of polarization state and folded light beam;
On the light path of described transmitted light beam, described high light efficiency stereo projection system also comprises successively: the First Line polarizer, be used for the first liquid crystal light valve type photomodulator of the opposite circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted into according to the mode of frame sequential;
On the light path of described folded light beam, described high light efficiency stereo projection system also comprises successively: be used for to change the folded light beam direction of propagation catoptron, the second linear polarizer, be used for the second liquid crystal light valve type photomodulator of the opposite circularly polarized light of the polarization state that odd-numbered frame linearly polarized light and even frame linearly polarized light is adjusted into according to the mode of frame sequential;
Also be provided with the polarization direction switching device that changes the vertical polarization attitude for the polarization state with transmission/folded light beam on the light path of the light path of described transmitted light beam or described folded light beam, described polarization direction switching device can be positioned at the arbitrary position on the light path before the first liquid crystal light valve type photomodulator/second liquid crystal light valve type photomodulator;
On the light path of the light path of described transmitted light beam or described folded light beam, also be provided with for the lens/lens combination that changes the projected light beam size.
7. high light efficiency stereo projection system as claimed in claim 6 is characterized in that, described polarization direction switching device is the meander configuration liquid crystal device.
8. high light efficiency stereo projection system as claimed in claim 6 is characterized in that, when described lens/lens combination was positioned at reflected light path, described lens/lens combination was positioned at the arbitrary position before the second linear polarizer;
Also comprise on the described transmitted light path be used to making transmitted light beam at the prism wedge of the image space on the metal curtain 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 folded light beam coincide at the image space of transmitted light beam on metal curtain of the image space on the metal curtain and described prism wedge effect; Described prism wedge is positioned at the arbitrary position before the described First Line polarizer.
9. high light efficiency stereo projection system as claimed in claim 6 is characterized in that, when described lens/lens combination was positioned at transmitted light path, described lens/lens combination was positioned at the arbitrary position before the First Line polarizer;
Also comprise on the described transmitted light path be used to making transmitted light beam at the prism wedge of the image space on the metal curtain 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 folded light beam coincide at the image space of transmitted light beam on metal curtain of the image space on the metal curtain and described prism wedge effect; Described prism wedge is positioned at described First Line polarizer arbitrary position before, and it is positioned at after described lens/lens combination.
10. high light efficiency 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 the second linear polarizer, described the 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 the 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 also are structure as a whole.
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| CN104349034A (en) * | 2013-07-25 | 2015-02-11 | 北京航天计量测试技术研究所 | Constant image brightness automatic adjusting circuit |
| CN104427253A (en) * | 2013-08-22 | 2015-03-18 | 北京航天计量测试技术研究所 | Camera light intensity automatic regulating apparatus |
| CN104656365A (en) * | 2013-11-21 | 2015-05-27 | 上海蝶维影像科技有限公司 | 3D imaging equipment with simple structure |
| CN103792780A (en) * | 2013-11-21 | 2014-05-14 | 上海蝶维影像科技有限公司 | High-optical efficiency 3D imaging apparatus |
| CN103616772A (en) * | 2013-11-27 | 2014-03-05 | 王高胜 | 3D movie and television system and 3D projection method |
| CN103616772B (en) * | 2013-11-27 | 2016-08-24 | 王高胜 | 3D video system and 3D projecting method |
| CN103792781A (en) * | 2014-02-21 | 2014-05-14 | 深圳市格特斯电子有限公司 | Optical system for stereoprojection and method for carrying out stereoprojection |
| WO2015123901A1 (en) * | 2014-02-21 | 2015-08-27 | 深圳未来立体科技有限公司 | Optical system for stereoprojection and projection method thereof |
| CN103792781B (en) * | 2014-02-21 | 2017-01-25 | 深圳未来立体科技有限公司 | Optical system for stereoprojection and method for carrying out stereoprojection |
| CN107889552B (en) * | 2015-05-11 | 2020-07-07 | 瑞尔D股份有限公司 | High brightness image display apparatus using modulator asymmetric driver and method of operating the same |
| CN107889552A (en) * | 2015-05-11 | 2018-04-06 | 瑞尔D股份有限公司 | Use the high-brghtness picture images display device and its operating method of modulator asymmetry driver |
| CN104898366A (en) * | 2015-06-23 | 2015-09-09 | 深圳市时代华影科技股份有限公司 | High-light-effect 3D system based on liquid crystal lenses |
| CN107422520A (en) * | 2017-08-25 | 2017-12-01 | 亚世光电（鞍山）有限公司 | A kind of specular removal quick response 3D projection screens and method |
| CN111448506A (en) * | 2017-10-11 | 2020-07-24 | Volfoni研发公司 | Stereoscopic three-dimensional projection system with short throw ratio |
| CN108469716A (en) * | 2018-05-20 | 2018-08-31 | 广州极智未来科技有限公司 | A kind of short focus polarised light projecting method |
| CN111025673A (en) * | 2018-10-09 | 2020-04-17 | 深圳市点睛创视技术有限公司 | Prism adjusting device and method of projection optical machine |
| CN114902117A (en) * | 2019-11-21 | 2022-08-12 | Volfoni 研发公司 | Polarization conversion system, passive linear polarization 3D glasses and linear polarization 3D system |
| CN114902117B (en) * | 2019-11-21 | 2024-06-04 | Volfoni研发公司 | Polarization conversion system, passive linear polarization 3D glasses and linear polarization 3D system |
| CN112327504A (en) * | 2020-11-16 | 2021-02-05 | 武汉华星光电技术有限公司 | 3D laser projection television and laser television system |
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