WO2013102318A1 - 一种单投影机式立体投影系统、投影机及驱动方法 - Google Patents

一种单投影机式立体投影系统、投影机及驱动方法 Download PDF

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Publication number
WO2013102318A1
WO2013102318A1 PCT/CN2012/071672 CN2012071672W WO2013102318A1 WO 2013102318 A1 WO2013102318 A1 WO 2013102318A1 CN 2012071672 W CN2012071672 W CN 2012071672W WO 2013102318 A1 WO2013102318 A1 WO 2013102318A1
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Prior art keywords
liquid crystal
vertical alignment
type liquid
polarized light
light valve
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PCT/CN2012/071672
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English (en)
French (fr)
Inventor
李艳龙
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深圳秋田微电子有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/363—Image reproducers using image projection screens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B35/00—Stereoscopic photography
    • G03B35/18—Stereoscopic photography by simultaneous viewing
    • G03B35/26—Stereoscopic photography by simultaneous viewing using polarised or coloured light separating different viewpoint images
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing

Definitions

  • the invention belongs to the technical field of stereoscopic projection, in particular to a single projector stereoscopic projection system, a projector and a driving method, and realizes stereoscopic projection by using one projector with two vertically arranged liquid crystal light valves and circular polarized glasses.
  • the existing stereoscopic projection technology generally utilizes two projectors, and a fixed left-handed circular polarizer and a right-handed circular polarizer are respectively installed in front of the two lenses to convert the light into left-handed circular polarization and right-handed circularly polarized light, and the two projectors simultaneously Projected on a screen, viewers can see stereo images after wearing circular polarizer glasses.
  • two projectors need to be accurately aligned to ensure the accuracy of the projection position, and the brightness of the two projectors is basically the same and the attenuation speed is basically the same, and the two projectors are used at a relatively high cost.
  • the first technical problem to be solved by the present invention is to provide a single projector type stereoscopic projection system, which aims to improve the stereoscopic projection effect in a cost-effective single projection manner.
  • a second technical problem to be solved by the present invention is to provide a projector aimed at improving the stereoscopic projection effect.
  • a third technical problem to be solved by the present invention is to provide a driving method for the above double liquid crystal light valve, which aims to improve the stereoscopic projection effect in a cost-effective single projection manner.
  • the single projector type stereoscopic projection system provided by the present invention in order to solve the first technical problem includes, in order of the optical path, in order:
  • the projector for alternately playing a left eye image and a right eye image, supporting video playback with a frame frequency of 100 Hz or higher;
  • the projector is a digital micromirror projector, a liquid crystal projector on a silicon, a liquid crystal display Projector or laser projection projector;
  • a linear polarizer for converting the projected light of the projector into first linearly polarized light
  • a first vertical alignment type liquid crystal light valve for converting first linearly polarized light transmitted from the linear polarizer to the first by synchronously modulating the output light of the odd-numbered frame and the even-numbered frame of the linear polarizer a second linearly polarized light whose polarization direction is perpendicular to the linearly polarized light, or does not exert any effect on the first linearly polarized light;
  • a second vertical alignment type liquid crystal light valve for synchronously modulating the output light of the odd-numbered frame and the even-numbered frame of the linear polarizer, and passing through the second line of the first vertical alignment type liquid crystal light valve during the dynamic compensation period
  • the polarized light is rotated into the first linearly polarized light, and does not exert any effect on the polarized light passing through itself during the period other than the dynamic compensation time;
  • a polarization state converter which is located on the light exiting side of the second vertical alignment type liquid crystal light valve, and is configured to convert the first linearly polarized light and the second linearly polarized light output by the second vertical alignment type liquid crystal light valve into left-handed rotation respectively Circularly polarized light and right-handed circularly polarized light;
  • a projection screen for reflecting and reflecting the projected light output of the polarization state converter, the reflected light maintaining a polarization state of the circularly polarized light output from the polarization state converter;
  • Circular polarized glasses for separating left and right eye images reflected by the projection screen
  • the stereoscopic projection system further includes a synchronization circuit for extracting a frame frequency synchronization signal of the left and right eye images from the projector, and driving the first vertical alignment type liquid crystal light valve and the second vertical alignment type liquid crystal light valve according to the extraction result .
  • the above projector provided to solve the second technical problem includes: a linear polarizer for converting projection light of the projector into first linearly polarized light; and a first vertical alignment type liquid crystal light valve for Converting the first linearly polarized light transmitted from the linear polarizer into a second linear polarization perpendicular to the polarization direction of the first linearly polarized light by synchronously modulating the output light of the odd and even frames of the linear polarizer Light, or does not have any effect on the first linearly polarized light; a second vertical alignment type liquid crystal light valve for synchronously modulating the output light of the odd and even frames of the linear polarizer during the dynamic compensation period Rotating the second linearly polarized light passing through the first vertical alignment type liquid crystal light valve into the first linearly polarized light, and does not exert any effect on the polarized light passing through itself in a period other than the dynamic compensation; the polarization state converter is located at The light-emitting side of the second vertical alignment type liquid crystal light valve is configured to
  • the present invention provides a driving method for the above liquid crystal light valve, which is provided to solve the third technical problem, and includes the following steps:
  • Step A the synchronization circuit is configured to generate a plurality of driving voltage signals, and extract a frame frequency synchronization signal of the left and right eye images from the projector in real time;
  • Step B The synchronization circuit drives the first vertical alignment type liquid crystal light valve according to the extraction result, so that in the dynamic compensation period of the odd frame (t1), the time period other than the dynamic compensation of the odd frame (t2),
  • the retardation amount of the liquid crystal molecules of the first vertical alignment type liquid crystal light valve is one-half wavelength and zero, respectively;
  • the retardation amount of the liquid crystal molecules of the first vertical alignment type liquid crystal light valve in the overvoltage driving period of the even frame (t3) Rapidly rise to one-half wavelength, the retardation of the liquid crystal molecules of the first vertical alignment type liquid crystal light valve is maintained at one-half wavelength in a period other than the overvoltage driving of the even frames; or the dynamic compensation time in even frames
  • the retardation amounts of the liquid crystal molecules of the first vertical alignment type liquid crystal light valve are respectively one-half wavelength, zero; the over-voltage of the odd-numbered frames During the driving period (t3), the retardation amount
  • Step C The synchronization circuit further drives the second vertical alignment type liquid crystal light valve while performing step B, so as to be in a period other than the dynamic compensation period of the odd frame (t1) and the odd frame.
  • the retardation amounts of the liquid crystal molecules of the second vertical alignment type liquid crystal light valve are respectively one-half wavelength, zero, zero; or in the dynamic compensation period of the even frame (t1), even number
  • the retardation amounts of the liquid crystal molecules of the second vertical alignment type liquid crystal light valve are respectively one-half wavelength, zero, and zero.
  • the invention provides two VAs (Vertical Alignment) Mode, vertical alignment type)
  • VAs Very Alignment
  • the single projector stereoscopic projection device of the liquid crystal light valve realizes the way of projecting stereoscopic images by a single projector.
  • the vertical alignment type display mode has ultra-high contrast ratio and is one of the basic modes in liquid crystal display.
  • the utility model Compared with the stereo projector device of the dual projector, the utility model has the advantages of simple structure, simple circuit and low cost, and no need to consider two projector projections. Image alignment problem and brightness attenuation imbalance problem.
  • the VA type liquid crystal light valve does not have any optical retardation when no voltage is applied, the polarization state of the incident light can be better maintained, and the contrast of the entire stereoscopic projection system is significantly increased, thereby providing a better 3D experience for the viewer.
  • FIG. 1 is an optical structural diagram of a single projector type stereoscopic projection system according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of a first vertical alignment type liquid crystal light valve and a second vertical alignment type liquid crystal light valve according to an embodiment of the present invention
  • FIG. 3A and FIG. 3B are respectively schematic diagrams showing relative optical axes of a linear polarizer, a first vertical alignment liquid crystal light valve, a second vertical alignment liquid crystal light valve, and a polarization state converter according to an embodiment of the present invention
  • FIGS. 4A and 4B are schematic diagrams showing driving waveforms of a first vertical alignment type liquid crystal light valve and a second vertical alignment type liquid crystal light valve according to an embodiment of the present invention.
  • FIG. 5 is a graph showing the correspondence between the corresponding voltage and the delay amount and the polarization state of the emitted light in each time period in the driving method of the liquid crystal light valve provided by the present invention.
  • a single projector and a high-contrast projected stereoscopic image are realized by using one projector with two VA-type liquid crystal light valves and matching circuits.
  • a single projector type stereoscopic projection system includes, in sequence, a projector 1, a linear polarizer 2, a first vertical alignment type liquid crystal light valve 3, and a second vertical alignment type liquid crystal light.
  • the projector 1 is used to alternately play the left eye image and the right eye image, for example, playing in a frame sequential manner, the first frame playing the left eye image, the second frame playing the right eye image, the third frame playing the left eye image, The fourth frame replays the right eye image... and so on. It is required from the hardware to support video playback with a frame frequency of 100 Hz or higher.
  • the linear polarizer 2 is used for converting the projection light of the projector 1 into the first linearly polarized light, and specifically, an absorption type linear polarization device, a metal wire grid type linear polarization device, a polarization beam splitting prism type, and a polarization beam splitting film type linear polarization device can be used. Or a glass-type linear polarization device (usually using a multilayer semi-reflective film structure), and the above-mentioned absorption type linear polarization device is a dye type or iodine type polarizer having a polarization degree higher than 99%. In order to increase the light utilization efficiency, an antireflection film may be plated on the light incident surface of each of the above linear polarizers.
  • the first vertical alignment type liquid crystal light valve 3 converts the first linearly polarized light transmitted from the linear polarizer 2 into the first linearly polarized light by synchronously modulating the odd-numbered frames and the even-numbered frames of the output light of the linear polarizer 2.
  • the second linearly polarized light having a polarization direction is perpendicular or does not exert any effect on the first linearly polarized light.
  • the second vertical alignment type liquid crystal light valve 4 optically compensates the first vertical alignment type liquid crystal light valve 3 by synchronously modulating the odd-numbered frame and the even-numbered frame output light of the linear polarizer 2, thereby improving the entire light valve system.
  • the optical response speed, the second linearly polarized light passing through the first vertical alignment type liquid crystal light valve 3 is rotated into the first linearly polarized light during the dynamic compensation period, and does not have any effect on the polarized light passing through itself in other time periods. .
  • the first vertical alignment type liquid crystal light valve 3 is configured to convert the polarization direction of the first linearly polarized light by 90 degrees into the second linearly polarized light in an odd frame in the dynamic compensation period of the odd frame (t1)
  • the polarization state of the first linearly polarized light remains unchanged during the time period other than the dynamic compensation (t2), and the polarization direction of the first linearly polarized light is rotated by 90 degrees during the overvoltage driving time of the even frame.
  • the polarization direction of the first linearly polarized light is rotated by 90 degrees into the second linearly polarized light, and the time period other than the dynamic compensation of the even frame (t2)
  • the polarization state of the first linearly polarized light remains unchanged, and the polarization direction of the first linearly polarized light is rotated by 90 degrees into a second linearly polarized light and an overvoltage in an odd frame during an overvoltage driving time of an odd frame.
  • the time outside the drive keeps the polarization state of the second linearly polarized light unchanged.
  • the second vertical alignment type liquid crystal light valve 4 is configured to convert the polarization direction of the second linearly polarized light output by the first vertical alignment type liquid crystal light valve by 90 degrees into the first in the dynamic compensation period of the odd frame (t1) Linearly polarized light, in a period other than dynamic compensation of odd frames (t2), the polarization state of the first linearly polarized light output by the first vertical alignment type liquid crystal light valve is kept constant, and the first vertical direction is in an even frame
  • the polarization state of the second linearly polarized light outputted by the alignment type liquid crystal light valve remains unchanged; or the second linear polarization for outputting the first vertical alignment type liquid crystal light valve during the dynamic compensation period of the even frame (t1)
  • the polarization direction of the light is rotated by 90 degrees to be converted into the first linearly polarized light, and the polarization state of the first linearly polarized light output by the first vertical alignment type liquid crystal light valve is maintained in a period other than the dynamic compensation of the even frames (t2)
  • the first vertical alignment liquid crystal light valve 3 and the second vertical alignment liquid crystal light valve 4 have the same structure, as shown in FIG. 2, including a glass substrate 9, a silicon dioxide layer 10, and indium tin oxide.
  • the pretilt angle of the alignment layer 12 is between 85 degrees and 90 degrees, and the liquid crystal molecules can be arranged in a direction perpendicular to the surface of the glass substrate; the liquid crystal used for the VA liquid crystal light valve has a negative dielectric anisotropy; two VA The liquid crystal light valve adopts the same design, has the same delay amount, and uses the same kind of liquid crystal material; in order to improve the response speed of the VA liquid crystal light valve, a certain proportion of polymer can also be mixed inside the liquid crystal material, after UV photopolymerization The formation of a polymer network can effectively improve the response speed of the VA type liquid crystal, and is called a polymer-stabilized vertical alignment type liquid crystal.
  • the polarization state converter 5 is located on the light exiting side of the second vertical alignment type liquid crystal light valve 4, and is configured to convert the first linearly polarized light and the second linearly polarized light outputted by the second vertical alignment type liquid crystal light valve 4 into left-handed circles, respectively. Polarized light and right-handed circularly polarized light.
  • the long-axis projection direction of the liquid crystal molecules in the first vertical alignment type liquid crystal light valve 3 is 45 degrees or minus 45 degrees from the polarization direction of the linear polarizer 2, and the second
  • the long axis projection direction of the liquid crystal molecules in the vertical alignment type liquid crystal light valve 4 is perpendicular to the long axis projection direction of the liquid crystal molecules in the first vertical alignment type liquid crystal light valve 3, wherein the long axis direction of the liquid crystal molecules is determined by the rubbing direction of the alignment layer 12.
  • the polarization converter 5 can be realized by a quarter-wave retardation film, and the optical axis direction thereof is parallel to the long-axis projection direction of the liquid crystal molecules in the active state of the first vertical alignment type liquid crystal light valve, and the delay amount is in the range of 120 nm. Between 150 nm, the typical values are 125 nm and 138 nm. 3A and 3B are relative angle comparisons of the optical axes of the four, the polarization direction of the linear polarization square 2 in FIG.
  • the long-axis projection direction of the liquid crystal molecules of the first vertical alignment liquid crystal light valve 3 is 17, and the second vertical alignment
  • the long-axis projection direction of the liquid crystal molecules in the liquid crystal light valve 4 is 18, the optical axis direction of the quarter-wave retardation film 5 is 19, the direction 16 is at an angle of 45 degrees with the direction 17, and the direction 17 is perpendicular to the direction 18, and the direction 17 Parallel to direction 19.
  • the long axis projection direction of the liquid crystal molecules of the first vertical alignment type liquid crystal light valve 3 is 20, and the long axis projection direction of the liquid crystal molecules in the second vertical alignment type liquid crystal light valve 4 is 21, and the optical axis of the quarter-wavelength retardation film 5 is The direction is 22.
  • the direction 16 is at an angle of 45 degrees to the direction 20, the direction 20 is perpendicular to the direction 21, and the direction 20 is parallel to the direction 22.
  • the projection screen 6 is for performing reflection imaging on the circularly polarized light projection light output from the polarization state converter 5, and reflecting the left and right images to the circularly polarized glasses 7, and the reflected light maintains the polarization state of the circularly polarized light output from the polarization state converter 5.
  • the circular polarized glasses 7 separate the left and right eye images.
  • the above projection screen 6 must be a metal screen.
  • the general gain coefficient is above 1.5, and the common range is between 1.8 and 2.5. After the incident polarized light is reflected by the metal screen, the polarization state of the incident polarized light can be maintained, and substantially no depolarization occurs. .
  • the left and right eyes of the circular polarized glasses 7 respectively correspond to a left-handed circular polarizer and a right-handed circular polarizer, and specifically may be a left-eye corresponding left-handed circular polarizer, a right-eye corresponding right-handed circular polarizer, or conversely, a left-eye corresponding right-handed circularly polarized light.
  • the slice and the right eye correspond to a left-handed circular polarizer.
  • the projector 1 is used to alternately play the left eye image and the right eye image.
  • the first vertical alignment type liquid crystal light valve 3 In order to cooperate with the image specifically played by the projector, the first vertical alignment type liquid crystal light valve 3, The two vertical alignment type liquid crystal light valves 4 are driven accordingly. Therefore, the stereoscopic projection system further includes a synchronization circuit 8 for extracting a frame frequency synchronization signal of the left and right eye images from the projector 1, and generating the first vertical alignment type liquid crystal light valve 3 and the second in a dynamic compensation manner according to the extraction result.
  • the drive waveforms are shown in Figures 4A and 4B, respectively.
  • the linear polarizer 2, the first vertical alignment type liquid crystal light valve 3, the second vertical alignment type liquid crystal light valve 4, the polarization state converter 5, and the synchronization circuit 8 may be externally disposed outside the projector 1 as a periphery of the projector.
  • the components can also be built in the projector 1.
  • the linear polarizer 2 is disposed in front of the lens of the projector 1, and the first vertical alignment type liquid crystal light valve 3 is located outside the linear polarizer 2 (the lens side of the projector 1 is defined as the inner side), and the second vertical alignment type liquid crystal light
  • the valve 4 is located outside the first vertical alignment type liquid crystal light valve 3, and the outer side of the second vertical alignment type liquid crystal light valve 4 is attached to the quarter-wavelength retardation film 5.
  • the video input signal is divided into left and right eye image signals, which are sequentially transmitted to the projector 1 in sequence, and the projector 1 sequentially plays the left eye picture and the right eye picture according to the time series manner, that is, the left and right eye pictures respectively correspond to the odd frame picture and the even frame picture; the projector 1
  • the emitted light passes through the linear polarizer 2, the first vertical alignment type liquid crystal light valve 3, the second vertical alignment type liquid crystal light valve 4, and the wavelength retardation film 5 in this order. Projected onto the projection screen 6, the light is reflected by the projection screen 6, and the light remains circularly polarized. The viewer can see the left eye image and the right eye image by wearing the circular polarized glasses 7, respectively, to realize the left eye image and the right eye image. Separation to achieve 3D display.
  • the time required for the projector to play one frame of picture is T, and the left eye picture and the right eye picture are sequentially played in sequence, corresponding to odd frames and even frames respectively; by two VA type liquid crystal light valves and quarter wave retardation film
  • the light valve system composed of 5 respectively modulates the light of each frame picture synchronously, so that the light of the odd frame and the even frame corresponds to different polarization states.
  • the present invention also provides a method of driving a liquid crystal light valve in the above stereoscopic projection system, comprising the steps of:
  • Step A the synchronization circuit is configured to generate a plurality of driving voltage signals, and extract a frame frequency synchronization signal of the left and right eye images from the projector in real time;
  • Step B The synchronization circuit drives the first vertical alignment type liquid crystal light valve according to the extraction result, so that in the dynamic compensation period of the odd frame, the time period other than the dynamic compensation of the odd frame, and the even frame, the first The retardation amount of the liquid crystal molecules of the vertically arranged liquid crystal light valve is one-half wavelength, zero, one-half wavelength, respectively; or in a time period other than dynamic compensation of even frames in the dynamic compensation period of even frames In the odd frame, the retardation amounts of the liquid crystal molecules of the first vertical alignment liquid crystal light valve are respectively one-half wavelength, zero, one-half wavelength;
  • Step C The synchronization circuit further drives the second vertical alignment type liquid crystal light valve while performing step B, so that in the dynamic compensation period of the odd frame, the time period other than the dynamic compensation of the odd frame, the even number In the frame, the retardation amount of the liquid crystal molecules of the second vertical alignment liquid crystal light valve is one-half wavelength, zero, zero, respectively; or the time period other than the dynamic compensation of the even frames in the dynamic compensation period of the even frame In the inner and odd frames, the retardation amounts of the liquid crystal molecules of the second vertical alignment type liquid crystal light valve are one-half wavelength, zero, and zero, respectively.
  • the specific implementation may be that the odd frame corresponds to the left eye image, the even frame corresponds to the right eye image, or the odd frame corresponds to the right eye image, and the even frame corresponds to the left eye image.
  • the driving voltage signals generated by the synchronizing circuit include, in descending order, a positive high voltage V2, a secondary positive high voltage V1, a zero voltage 0, a secondary negative high voltage - V1, and a negative high voltage.
  • V2 wherein t1 time is a dynamic compensation time, during which the first vertical alignment type liquid crystal light valve 3 maintains a +V1 voltage, and the second vertical alignment type liquid crystal light valve 4 is driven from the original 0V to the first vertical alignment type liquid crystal
  • the voltage of +V1 is maintained; after the end of the time t1, the voltages of the two light valves are simultaneously reduced to 0V, and the first vertical alignment type liquid crystal light valve 3 and the second vertical alignment type liquid crystal light valve 4 are at this time.
  • the liquid crystal molecules in the dynamic response are consistent, and the optical states thereof are mutually compensated;
  • the light passing through the second vertical alignment type liquid crystal light valve 4 is linearly polarized light, and the polarization direction is consistent with the polarization direction of the linear polarizer 2;
  • in the t2 time period two The liquid crystal molecules in the light valve return to the vertical state when the voltage is 0V;
  • the light passing through the second vertical alignment liquid crystal light valve 4 is still linearly polarized, and the polarization direction is consistent with the polarization direction of the linear polarizer 2;
  • the overvoltage driving time of the first vertical alignment type liquid crystal light valve 3, during the time t3, the voltage applied to the first vertical alignment type liquid crystal light valve 3 is a high voltage +V2 for the first vertical alignment type liquid crystal light Extension of valve 3
  • the amount is driven to 1/2 wavelength in a short time; when the delay amount of the first vertical alignment type liquid crystal light valve 3 reaches 1/2 wavelength, the time t3 ends; the voltage of the first vertical alignment type
  • the liquid crystal molecules in the second vertical alignment type liquid crystal light valve 4 are in a vertical state without a delay amount, and do not change the polarization state of the transmitted light. Therefore, the light passing through the second vertical alignment type liquid crystal light valve 4 is still linearly polarized light, and the polarization direction is It is perpendicular to the polarization direction of the linear polarizer 2.
  • the sum of t1 and t2 is equal to T
  • the sum of t3 and t4 is also equal to T
  • the time T is the time required for the projector to project one frame of picture; thus, one driving period ends, each driving period includes two frames, and the period is 2T.
  • the correspondence between the corresponding voltage and the delay amount and the polarization state of the outgoing light in each time period is listed in FIG.
  • the positive and negative levels of the drive waveform are interchanged to avoid excessive charge build-up inside the cell, enabling AC drive.
  • the light emitted from the second vertical alignment type liquid crystal light valve 4 is converted into circularly polarized light after passing through the quarter-wave retardation film 5, since the polarization directions of the emitted light are perpendicular to each other in different frame times, and one quarter
  • the optical axis direction of the wavelength retardation film 5 is at an angle of 45 degrees or a negative 45 degrees, so that left-handed circularly polarized light and right-handed circularly polarized light are respectively formed in different frame times; after being reflected by the metal screen 6, the light remains circularly polarized.
  • the viewer can wear the polarized glasses 7 to see the left eye image and the right eye image respectively, and realize the separation of the left eye image and the right eye image, thereby realizing 3D display.
  • the invention adopts the overvoltage driving technology and the dynamic response compensation technology, and the optical system composed of the two liquid crystal light valves has a very high response speed when performing different optical state transitions, so that the optical response time is reduced to less than 100 microseconds.
  • the entire stereoscopic projection device can support a higher frame frequency, and the tailing phenomenon of the high-speed moving picture can be significantly improved.
  • the invention has the advantages of simple structure, simple circuit and low cost, and does not need to consider the alignment problem of the projection images of the two projectors.
  • the optical self-compensating curved double-light valve stereo projection device it has higher response speed, higher contrast ratio and more ideal stereoscopic display effect.

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Abstract

一种双液晶光阀单投影机式立体投影系统，沿光路方向依次包括：投影机（1）、线偏振器（2）、第一垂直排列型液晶光阀（3）、第二垂直排列型光阀（4）、偏振状态转换器（5）、投影屏幕（6）、圆偏光眼镜（7）以及同步电路（8）。与双投影机的立体投影系统相比，本发明的单投影机立体投影系统结构简单、成本低、图像质量高。

Description

一种单投影机式立体投影系统、投影机及驱动方法 技术领域
本发明属于立体投影技术领域，尤其涉及一种单投影机式立体投影系统、投影机及驱动方法，利用一台投影机搭配两个垂直排列型液晶光阀以及圆偏光眼镜实现立体投影。
 背景技术
现有立体投影技术一般利用两台投影机，两镜头前分别加装固定的左旋圆偏振器和右旋圆偏振器，将光线转化为左旋圆偏振和右旋圆偏振光，两台投影机同时投影在一个银幕上，观众佩戴圆偏振片眼镜后可观看到立体影像。此种方式需要两台投影机精确对位，以保证投影位置的准确性，并且需要两台投影机氙灯亮度基本一致以及衰减速度基本一致，同时使用两台投影机，成本较高。
技术问题
本发明所要解决的第一个技术问题在于提供一种单投影机式的立体投影系统，旨在以成本低廉的单投影的方式提高立体投影效果。
本发明所要解决的第二个技术问题在于提供一种投影机，旨在提高立体投影效果。
本发明所要解决的第三个技术问题在于提供一种对上述双液晶光阀的驱动方法，旨在以成本低廉的单投影的方式提高立体投影效果。
 技术解决方案
本发明为解决第一个技术问题而提供的单投影机式的立体投影系统沿光路方向依次包括：
用于交替播放左眼图像和右眼图像、支持帧频率为100HZ或更高帧频率的视频播放的投影机；所述投影机为数字微镜式投影机、硅上液晶式投影机、液晶显示式投影机或激光投影式投影机；
用于将所述投影机的投影光线转换为第一线偏振光的线偏振器；
第一垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，将从线偏振器透过的第一线偏振光转化为与所述第一线偏振光偏振方向垂直的第二线偏振光，或者不对第一线偏振光产生任何作用；
第二垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，在动态补偿时间段内将经过第一垂直排列型液晶光阀的第二线偏振光回转为第一线偏振光，在动态补偿时间之外的时间段内不对经过其本身的偏振光产生任何作用；
偏振状态转换器，其位于所述第二垂直排列型液晶光阀的出光侧，用于将所述第二垂直排列型液晶光阀输出的第一线偏振光和第二线偏振光分别转换为左旋圆偏振光和右旋圆偏振光；
投影屏幕，用于对所述偏振状态转换器输出的投影光线反射成像，反射光保持从所述偏振状态转换器输出的圆偏振光的偏振状态；
用于分离所述投影屏幕反射的左右眼图像的圆偏光眼镜；
所述立体投影系统还包括一同步电路，用于从所述投影机提取左右眼图像的帧频率同步信号，并根据提取结果驱动第一垂直排列型液晶光阀和第二垂直排列型液晶光阀。
本发明为解决第二个技术问题而提供的上述投影机包括：用于将所述投影机的投影光线转换为第一线偏振光的线偏振器；第一垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，将从线偏振器透过的第一线偏振光转化为与所述第一线偏振光偏振方向垂直的第二线偏振光，或者不对第一线偏振光产生任何作用；第二垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，在动态补偿时间段内将经过第一垂直排列型液晶光阀的第二线偏振光回转为第一线偏振光，在动态补偿之外的时间段内不对经过其本身的偏振光产生任何作用；偏振状态转换器，其位于所述第二垂直排列型液晶光阀的出光侧，用于将所述第二垂直排列型液晶光阀输出的第一线偏振光和第二线偏振光分别转换为左旋圆偏振光和右旋圆偏振光。
本发明为解决第三个技术问题而提供的对上述液晶光阀的驱动方法，包括下述步骤：
步骤A，同步电路用于产生若干驱动电压信号，并实时从投影机提取左右眼图像的帧频率同步信号；
步骤B，同步电路根据提取结果对第一垂直排列型液晶光阀进行驱动，以使在奇数帧的动态补偿时间段内（t1），奇数帧的动态补偿之外的时间段内（t2）、第一垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零；偶数帧的过压驱动时间段内（t3）第一垂直排列型液晶光阀的液晶分子的延迟量迅速升至二分之一波长，偶数帧的过压驱动之外的时间段内第一垂直排列型液晶光阀的液晶分子的延迟量保持二分之一波长；或者在偶数帧的动态补偿时间段内（t1）、偶数帧的动态补偿之外的时间段内（t2），第一垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零；奇数帧的过压驱动时间段内（t3）第一垂直排列型液晶光阀的液晶分子的延迟量迅速升至二分之一波长，奇数帧的过压驱动之外时间段内第一垂直排列型液晶光阀的液晶分子的延迟量保持二分之一波长；
步骤C，同步电路在执行步骤B的同时，还对第二垂直排列型液晶光阀进行驱动，以使在奇数帧的动态补偿时间段内（t1）、奇数帧的动态补偿之外的时间段内（t2）、偶数帧时，第二垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、零；或者在偶数帧的动态补偿时间段内（t1）、偶数帧的动态补偿之外的时间段内（t2）、奇数帧时，第二垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、零。
 有益效果
本发明提供的采用两个VA（Vertical Alignment Mode，垂直排列型）液晶光阀的单投影机立体投影装置，实现了单台投影机投影立体影像的方式。垂直排列型的显示模式具有超高对比度，是液晶显示中的基本模式之一，相比于双投影机的立体投影装置，本实用新型结构简单，电路简单，成本低，无需考虑两投影机投影图像对位问题及亮度衰减不均衡问题。由于VA型液晶光阀在未加电压时没有任何光学延迟量，因此可以更好地保持入射光线的偏振状态，使整个立体投影系统的对比度显著增加，为观众带来更好的3D体验。
附图说明
图1是本发明实施例提供的单投影机式的立体投影系统的光学结构图；
图2是本发明实施例提供的第一垂直排列型液晶光阀和第二垂直排列型液晶光阀的结构图；
图3A、图3B分别是本发明实施例提供的线偏振器、第一垂直排列型液晶光阀、第二垂直排列型液晶光阀、偏振状态转换器的光轴相对角度示意图；
图4A、图4B分别是本发明实施例提供的对第一垂直排列型液晶光阀和第二垂直排列型液晶光阀的驱动波形示意图。
图5是本发明提供的液晶光阀的驱动方法中各时间段内对应的电压与延迟量以及出射光的偏振状态之间的对应关系图表。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明中，通过一台投影机搭配两个VA型液晶光阀以及配套电路，实现单台投影机、高对比度的投影立体影像。
图1示出了本发明实施例提供的单投影机式的立体投影系统的光学结构，为了便于描述，仅示出了与本实施例相关的部分。参照图1，本发明实施例提供的单投影机式的立体投影系统沿光路方向依次包括：投影机1、线偏振器2、第一垂直排列型液晶光阀3、第二垂直排列型液晶光阀4、偏振状态转换器5、投影屏幕6、圆偏光眼镜7。
其中，投影机1用于交替播放左眼图像和右眼图像，例如以帧顺序的方式播放，第一帧播放左眼图像，第二帧播放右眼图像、第三帧再播放左眼图像，第四帧再播放右眼图像……，以此类推，从硬件上要求能支持帧频率为100HZ或更高帧频率的视频播放，可采用数字微镜式投影机、硅上液晶式投影机、液晶显示式投影机或激光投影式投影机等。
线偏振器2用于将投影机1的投影光线转换为第一线偏振光，具体可采用吸收型线偏振器件、金属线栅型线偏振器件、偏振分光棱镜型、偏振分光膜型线偏振器件或玻堆型线偏振器件（常采用多层半反射膜结构），上述吸收型线偏振器件为偏光度高于99%的染料型或碘型偏光片。为了增加光利用率，还可在上述各线偏振器的光线入射面镀一层防反射膜。
顺次排列的第一垂直排列型液晶光阀3和第二垂直排列型液晶光阀4同步调制将线偏振器2的奇数帧次和偶数帧次的输出光。第一垂直排列型液晶光阀3通过同步调制线偏振器2的奇数帧次和偶数帧次的输出光，将从线偏振器2透过的第一线偏振光转化为与第一线偏振光偏振方向垂直的第二线偏振光，或者不对第一线偏振光产生任何作用。第二垂直排列型液晶光阀4通过同步调制线偏振器2的奇数帧次和偶数帧次的输出光，配合第一垂直排列型液晶光阀3进行光学动态补偿，以此提高整个光阀系统的光学响应速度，在动态补偿时间段内将经过第一垂直排列型液晶光阀3的第二线偏振光回转为第一线偏振光，在其它时间段内不对经过其本身的偏振光产生任何作用。
具体地，第一垂直排列型液晶光阀3用于在奇数帧的动态补偿时间段内（t1）将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在奇数帧的动态补偿之外的时间段内（t2）对所述第一线偏振光的偏振状态保持不变、在偶数帧的过压驱动时间将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在偶数帧的过压驱动之外的时间保持第二线偏振光的偏振状态保持不变； 或者，在偶数帧的动态补偿时间段内（t1）将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在偶数帧的动态补偿之外的时间段内（t2）对所述第一线偏振光的偏振状态保持不变、在奇数帧的过压驱动时间将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在奇数帧的过压驱动之外的时间保持第二线偏振光的偏振状态保持不变。第二垂直排列型液晶光阀4用于在奇数帧的动态补偿时间段内（t1）将所述第一垂直排列型液晶光阀输出的第二线偏振光的偏振方向回转90度转换为第一线偏振光、在奇数帧的动态补偿之外的时间段内（t2）将第一垂直排列型液晶光阀输出的第一线偏振光的偏振状态保持不变、在偶数帧时对第一垂直排列型液晶光阀输出的第二线偏振光的偏振状态保持不变；或者，用于在偶数帧的动态补偿时间段内（t1）将所述第一垂直排列型液晶光阀输出的第二线偏振光的偏振方向回转90度转换为第一线偏振光、在偶数帧的动态补偿之外的时间段内（t2）将第一垂直排列型液晶光阀输出的第一线偏振光的偏振状态保持不变、在奇数帧时对第一垂直排列型液晶光阀输出的第二线偏振光的偏振状态保持不变。
本实施例中，第一垂直排列型液晶光阀3和第二垂直排列型液晶光阀4具有完全相同的结构，如图2所示，包括玻璃基板9，二氧化硅层10、氧化铟锡层11、取向层12（一般为聚酰亚胺）、液晶层13、边框胶14、衬垫粒子15；其中液晶层13厚度一般小于5微米，液晶层的光学延迟量一般大于250nm。取向层12的预倾角介于85度和90度之间，可以将液晶分子以垂直于玻璃基板表面的方向进行排列；VA型液晶光阀所用液晶具有负性介电各向异性；两个VA型液晶光阀采用相同设计，具有相同延迟量、并采用相同种类的液晶材料；为了提高VA型液晶光阀的响应速度，也可在液晶材料内部混入一定比例的聚合物，经过UV光聚合后，形成聚合物网络，可有效改善VA型液晶的响应速度，称之为聚合物稳定型垂直排列型液晶。
偏振状态转换器5位于所述第二垂直排列型液晶光阀4的出光侧，用于将第二垂直排列型液晶光阀4输出的第一线偏振光和第二线偏振光分别转换为左旋圆偏振光和右旋圆偏振光。
激活态时（即所加电压不为零时）上述第一垂直排列型液晶光阀3中的液晶分子长轴投影方向与线偏振器2的偏振方向成45度或负45度，而第二垂直排列型液晶光阀4中的液晶分子长轴投影方向与第一垂直排列型液晶光阀3中的液晶分子长轴投影方向相互垂直，其中液晶分子长轴方向由取向层12的摩擦方向决定。上述偏振转换器5可采用四分之一波长延迟膜实现，其光轴方向与所述第一垂直排列型液晶光阀中激活态时的液晶分子长轴投影方向平行，延迟量范围在120nm~150nm之间，典型值为125nm和138nm。图3A、图3B为四者光轴相对角度对比，图3A中线偏振方器2的偏振方向为16，第一垂直排列型液晶光阀3的液晶分子长轴投影方向为17，第二垂直排列型液晶光阀4中的液晶分子长轴投影方向为18，四分之一波长延迟膜5的光轴方向为19，方向16与方向17夹角45度，方向17与方向18垂直，方向17与方向19平行。图3B中线偏振方器2的偏振方向为16， 第一垂直排列型液晶光阀3的液晶分子长轴投影方向为20，第二垂直排列型液晶光阀4中的液晶分子长轴投影方向为21，四分之一波长延迟膜5的光轴方向为22。方向16与方向20夹角负45度，方向20与方向21垂直，方向20与方向22平行。
投影屏幕6用于对偏振状态转换器5输出的圆偏振光投影光线进行反射成像，将左右图像反射至圆偏光眼镜7，反射光保持了从偏振状态转换器5输出的圆偏振光的偏振状态，圆偏光眼镜7再将左右眼图像分离。上述投影屏幕6须为金属银幕，一般增益系数在1.5以上，常见范围为1.8~2.5之间，入射偏振光线经过金属银幕的反射后，可以保持入射偏振光的偏振态，基本无退偏振现象发生。圆偏光眼镜7的左右眼分别对应左旋圆偏光片和右旋圆偏光片，具体可以为左眼对应左旋圆偏光片、右眼对应右旋圆偏光片，或者反过来左眼对应右旋圆偏光片、右眼对应左旋圆偏光片。
如上文所述，投影机1用于交替播放左眼图像和右眼图像的投影机，在具体工作时，为配合投影机具体播放的图像，需要对第一垂直排列型液晶光阀3、第二垂直排列型液晶光阀4进行相应的驱动。因此上述立体投影系统还包括一同步电路8，用于从投影机1提取左右眼图像的帧频率同步信号，并根据提取结果产生以动态补偿方式驱动第一垂直排列型液晶光阀3和第二垂直排列型液晶光阀4。驱动波形分别为图4A和图4B所示。
上述线偏振器2、第一垂直排列型液晶光阀3、第二垂直排列型液晶光阀4、偏振状态转换器5、同步电路8可以外置于投影机1之外，作为投影机的外围部件，也可内置于投影机1之中。
下文结合图1及图4A、图4B对上述投影系统的工作原理进行详细描述。首先，将线偏振器2设于投影机1镜头前，第一垂直排列型液晶光阀3位于线偏振器2的外侧（投影机1镜头一侧定义为内侧），第二垂直排列型液晶光阀4位于第一垂直排列型液晶光阀3的外侧，第二垂直排列型液晶光阀4的外侧贴覆四分之一波长延迟膜5。视频输入信号分左右眼图像信号，依次交替传输给投影机1，投影机1按照时序方式依次播放左眼画面和右眼画面，即左右眼画面分别对应奇数帧画面和偶数帧画面；投影机1发出的光线依次经过线偏振器2、第一垂直排列型液晶光阀3、第二垂直排列型液晶光阀4、波长延迟膜5后， 投影到投影屏幕6上，光线经过投影屏幕6的反射，光线仍保持圆偏振的状态，观众佩戴圆偏光眼镜7即可分别看到左眼图像和右眼图像，实现左眼图像与右眼图像的分离，从而实现3D显示。
投影机播放一帧画面所需时间为T，左眼画面和右眼画面按照顺序依次来循环播放，分别对应奇数帧和偶数帧；由两个VA型液晶光阀以及四分之一波长延迟膜5组成的光阀系统分别对每帧画面的光线进行同步调制，使得奇数帧与偶数帧的光线对应不同的偏振状态。
本发明还提供了对上述立体投影系统中的液晶光阀进行驱动的方法，包括下述步骤：
步骤A，同步电路用于产生若干驱动电压信号，并实时从投影机提取左右眼图像的帧频率同步信号；
步骤B，同步电路根据提取结果对第一垂直排列型液晶光阀进行驱动，以使在奇数帧的动态补偿时间段内、奇数帧的动态补偿之外的时间段内、偶数帧时，第一垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、二分之一波长；或者在偶数帧的动态补偿时间段内、偶数帧的动态补偿之外的时间段内、奇数帧时，第一垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、二分之一波长；
步骤C，同步电路在执行步骤B的同时，还对第二垂直排列型液晶光阀进行驱动，以使在奇数帧的动态补偿时间段内、奇数帧的动态补偿之外的时间段内、偶数帧时，第二垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、零；或者在偶数帧的动态补偿时间段内、偶数帧的动态补偿之外的时间段内、奇数帧时，第二垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、零。
具体实现时可以是奇数帧对应左眼图像、偶数帧对应右眼图像，也可以是奇数帧对应右眼图像、偶数帧对应左眼图像。
参照图4A、图4B，同步电路产生的驱动电压信号按照从大到小的顺序包括：正高压V2、次正高压V1、零电压0、次负高压-V1、负高压- V2，其中t1时间为动态补偿时间，在此时间内第一垂直排列型液晶光阀3保持+V1电压，第二垂直排列型液晶光阀4从原来的0V驱动到与第一垂直排列型液晶光阀3相同状态，均保持+V1的电压；t1时间结束后，两个光阀的电压同时降低为0V，此时第一垂直排列型液晶光阀3与第二垂直排列型液晶光阀4内的液晶分子动态响应一致，其光学状态相互补偿；经过第二垂直排列型液晶光阀4的光线为线性偏振光，偏振方向与线偏振器2的偏振方向一致；在t2时间段内，两光阀中的液晶分子恢复到0V电压时的垂直状态；经过第二垂直排列型液晶光阀4的光线仍为线性偏振光，偏振方向与线偏振器2的偏振方向仍保持一致；t3时间为第一垂直排列型液晶光阀3的过压驱动时间，在t3时间段内，第一垂直排列型液晶光阀3上所加电压为高电压+V2，用于将第一垂直排列型液晶光阀3的延迟量在短时间内驱动到1/2波长；待第一垂直排列型液晶光阀3的延迟量达到1/2波长时，t3时间结束；第一垂直排列型液晶光阀3的电压马上切换至+V1,进入到t4时间段内，电压+V1用于保持第一垂直排列型液晶光阀3的延迟量为1/2波长；第二垂直排列型液晶光阀4在t3和t4时间内均保持0V；因此经过第一垂直排列型液晶光阀3的光线仍为线性偏振光，偏振方向被第一垂直排列型液晶光阀3旋转了90度，偏振方向与线偏振器2的偏振方向垂直。第二垂直排列型液晶光阀4中液晶分子为垂直状态，无延迟量，不改变透过光线的偏振状态，因此经过第二垂直排列型液晶光阀4的光线仍为线性偏振光，偏振方向与线偏振器2的偏振方向垂直。t1与t2之和等于T， t3与t4之和也等于T，时间T即为投影机放映一帧画面所需的时间；至此，一个驱动周期结束，每个驱动周期包含两帧，周期为2T。图5中列出各时间段内对应的电压与延迟量以及出射光的偏振状态之间的对应关系。
一个周期结束后，将驱动波形的正负电平相互调换，用于避免液晶盒内部聚集过多电荷，实现交流驱动。
从第二垂直排列型液晶光阀4射出的光，经过四分之一波长延迟膜5后转化为圆偏振光，由于在不同帧时间内出射光的偏振方向相互垂直，并且与四分之一波长延迟膜5的光轴方向成45度或负45度夹角，从而使得不同帧时间内分别形成左旋圆偏振光和右旋圆偏振光；经过金属银幕6反射后，光线仍保持圆偏振的状态；观众佩戴圆偏光眼镜7即可分别看到左眼图像和右眼图像，实现左眼图像与右眼图像的分离，从而实现3D显示。
本发明由于采用了过压驱动技术和动态响应补偿技术，两个液晶光阀组成的光学系统在进行不同的光学状态转换时，具有非常高的响应速度，使得光学响应时间降低到100微妙以下，从而使得整个立体投影装置可以支持更高的帧频率，可明显改善高速运动画面的拖尾现象。并且相比于双投影机的立体投影系统，本发明结构简单，电路简单，成本低，无需考虑两投影机投影图像对位问题。与光学自补偿弯曲型双光阀立体投影装置相比，具有更高的响应速度，更高的对比度，更理想的立体显示效果。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种单投影机式的立体投影系统，其特征在于，所述立体投影系统沿光路方向依次包括：
    用于交替播放左眼图像和右眼图像、支持帧频率为100HZ或更高帧频率的视频播放的投影机；所述投影机为数字微镜式投影机、硅上液晶式投影机、液晶显示式投影机或激光投影式投影机；
    用于将所述投影机的投影光线转换为第一线偏振光的线偏振器；
    第一垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，将从线偏振器透过的第一线偏振光转化为与所述第一线偏振光偏振方向垂直的第二线偏振光，或者不对第一线偏振光产生任何作用；
    第二垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，在动态补偿时间段内将经过第一垂直排列型液晶光阀的第二线偏振光回转为第一线偏振光，在动态补偿时间之外的时间段内不对经过其本身的偏振光产生任何作用；
    偏振状态转换器，其位于所述第二垂直排列型液晶光阀的出光侧，用于将所述第二垂直排列型液晶光阀输出的第一线偏振光和第二线偏振光分别转换为左旋圆偏振光和右旋圆偏振光；
    投影屏幕，用于对所述偏振状态转换器输出的投影光线反射成像，反射光保持从所述偏振状态转换器输出的圆偏振光的偏振状态；
    用于分离所述投影屏幕反射的左右眼图像的圆偏光眼镜；
    所述立体投影系统还包括一同步电路，用于从所述投影机提取左右眼图像的帧频率同步信号，并根据提取结果驱动第一垂直排列型液晶光阀和第二垂直排列型液晶光阀。
  2. 如权利要求1所述的单投影机式的立体投影系统，其特征在于：所述第一垂直排列型液晶光阀用于在奇数帧的动态补偿时间段内（t1）将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在奇数帧的动态补偿之外的时间段内（t2）对所述第一线偏振光的偏振状态保持不变、在偶数帧的过压驱动时间将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在偶数帧的过压驱动之外的时间保持第二线偏振光的偏振状态保持不变； 或者，在偶数帧的动态补偿时间段内（t1）将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在偶数帧的动态补偿之外的时间段内（t2）对所述第一线偏振光的偏振状态保持不变、在奇数帧的过压驱动时间将所述第一线偏振光的偏振方向旋转90度转换为第二线偏振光、在奇数帧的过压驱动之外的时间保持第二线偏振光的偏振状态保持不变；
    所述第二垂直排列型液晶光阀用于在奇数帧的动态补偿时间段内（t1）将所述第一垂直排列型液晶光阀输出的第二线偏振光的偏振方向回转90度转换为第一线偏振光、在奇数帧的动态补偿之外的时间段内（t2）将第一垂直排列型液晶光阀输出的第一线偏振光的偏振状态保持不变、在偶数帧时对第一垂直排列型液晶光阀输出的第二线偏振光的偏振状态保持不变；或者，用于在偶数帧的动态补偿时间段内（t1）将所述第一垂直排列型液晶光阀输出的第二线偏振光的偏振方向回转90度转换为第一线偏振光、在偶数帧的动态补偿之外的时间段内（t2）将第一垂直排列型液晶光阀输出的第一线偏振光的偏振状态保持不变、在奇数帧时对第一垂直排列型液晶光阀输出的第二线偏振光的偏振状态保持不变。
  3. 如权利要求1所述的单投影机式的立体投影系统，其特征在于，所述线偏振器、第一垂直排列型液晶光阀、第二垂直排列型液晶光阀、偏振状态转换器、同步电路内置于所述投影机中或外置于所述投影机之外。
  4. 如权利要求1所述的单投影机式的立体投影系统，其特征在于，所述线偏振器为吸收型线偏振器件、金属线栅型线偏振器件、偏振分光棱镜型、偏振分光膜型线偏振器件或玻堆型线偏振器件；所述吸收型线偏振器件为偏光度高于99%的染料型或碘型偏光片。
  5. 如权利要求1所述的单投影机式的立体投影系统，其特征在于，所述第一垂直排列型液晶光阀和/或第二垂直排列型液晶光阀的液晶层厚度小于5微米，光学延迟量一般大于250nm。
  6. 如权利要求1所述的单投影机式的立体投影系统，其特征在于，激活态时所述第一垂直排列型液晶光阀中的液晶分子长轴投影方向与所述线偏振器的偏振方向成45度或负45度；所述第二垂直排列型液晶光阀中的液晶分子长轴投影方向与所述第一垂直排列型液晶光阀中的液晶分子长轴投影方向相互垂直。
  7. 如权利要求1所述的单投影机式的立体投影系统，其特征在于，所述偏振状态转换器为一个四分之一波长延迟膜，其光轴方向与所述第一垂直排列型液晶光阀中激活态时的液晶分子长轴投影方向平行，延迟量范围在120nm~150nm之间。
  8. 一种投影机，其特征在于，包括：
    用于将所述投影机的投影光线转换为第一线偏振光的线偏振器；
    第一垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，将从线偏振器透过的第一线偏振光转化为与所述第一线偏振光偏振方向垂直的第二线偏振光，或者不对第一线偏振光产生任何作用；
    第二垂直排列型液晶光阀，用于通过同步调制所述线偏振器的奇数帧次和偶数帧次的输出光，在动态补偿时间段内将经过第一垂直排列型液晶光阀的第二线偏振光回转为第一线偏振光，在动态补偿时间之外的时间段内不对经过其本身的偏振光产生任何作用；
    偏振状态转换器，其位于所述第二垂直排列型液晶光阀的出光侧，用于将所述第二垂直排列型液晶光阀输出的第一线偏振光和第二线偏振光分别转换为左旋圆偏振光和右旋圆偏振光。
  9. 一种对如权利要求1至7任一项中的液晶光阀的驱动方法，其特征在于，包括下述步骤：
    步骤A，同步电路用于产生若干驱动电压信号，并实时从投影机提取左右眼图像的帧频率同步信号；
    步骤B，同步电路根据提取结果对第一垂直排列型液晶光阀进行驱动，以使在奇数帧的动态补偿时间段内（t1），奇数帧的动态补偿之外的时间段内（t2）、第一垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零；偶数帧的过压驱动时间段内（t3）第一垂直排列型液晶光阀的液晶分子的延迟量迅速升至二分之一波长，偶数帧的过压驱动之外的时间段内第一垂直排列型液晶光阀的液晶分子的延迟量保持二分之一波长；或者在偶数帧的动态补偿时间段内（t1）、偶数帧的动态补偿之外的时间段内（t2），第一垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零；奇数帧的过压驱动时间段内（t3）第一垂直排列型液晶光阀的液晶分子的延迟量迅速升至二分之一波长，奇数帧的过压驱动之外时间段内第一垂直排列型液晶光阀的液晶分子的延迟量保持二分之一波长；
    步骤C，同步电路在执行步骤B的同时，还对第二垂直排列型液晶光阀进行驱动，以使在奇数帧的动态补偿时间段内（t1）、奇数帧的动态补偿之外的时间段内（t2）、偶数帧时，第二垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、零；或者在偶数帧的动态补偿时间段内（t1）、偶数帧的动态补偿之外的时间段内（t2）、奇数帧时，第二垂直排列型液晶光阀的液晶分子的延迟量分别为二分之一波长、零、零。
  10. 如权利要求9所述的驱动方法，其特征在于，所述同步电路产生的驱动电压信号按照从大到小的顺序包括：正高压、次正高压、零电压、次负高压、负高压；
    所述步骤B中，同步电路在奇数帧的动态补偿时间段内（t1）、奇数帧的动态补偿之外的时间段内（t2）、偶数帧的过压驱动时间段内（t3）、偶数帧的过压驱动之外的时间段内（t4），分别以次正高压/次负高压、零电压、正高压/负高压、次正高压/次负高压驱动第一垂直排列型液晶光阀；或者，同步电路在偶数帧的动态补偿时间段内（t1）、偶数帧的动态补偿之外的时间段内（t2）、奇数帧的过压驱动时间段内（t3）、奇数帧的过压驱动之外的时间段内（t4），分别以次正高压/次负高压、零电压、正高压/负高压、次正高压/次负高压驱动第一垂直排列型液晶光阀；
    所述步骤C中，同步电路在奇数帧的动态补偿时间段内（t1）、奇数帧的动态补偿之外的时间段内（t2）、偶数帧时，分别以次正高压/次负高压、零电压、零电压驱动第二垂直排列型液晶光阀； 或者，同步电路在偶数帧的动态补偿时间段内（t1）、偶数帧的动态补偿之外的时间段内（t2）、奇数帧时，分别以次正高压/次负高压、零电压、零电压驱动第二垂直排列型液晶光阀。
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