CN102540696B - Single projector type stereoscopic projection system, projector and driving method - Google Patents
Single projector type stereoscopic projection system, projector and driving method Download PDFInfo
- Publication number
- CN102540696B CN102540696B CN201210005018.1A CN201210005018A CN102540696B CN 102540696 B CN102540696 B CN 102540696B CN 201210005018 A CN201210005018 A CN 201210005018A CN 102540696 B CN102540696 B CN 102540696B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- vertically aligned
- polarized light
- light valve
- aligned liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention is applicable to the technical field of stereoscopic projection, and provides a single projector type stereoscopic projection system with double liquid crystal light valves. The single projector type stereoscopic projection system comprises a projector, a linear polarizer, a first vertically-arranged liquid crystal light valve, a second vertically-arranged liquid crystal light valve, a polarization state converter, a projection screen, circular polarizing glasses and a synchronous circuit in sequence along a light path direction. The single projector type stereoscopic projection system uses a double vertically-arranged liquid crystal light valve type stereoscopic projection device with a single projector; the way that the single projector projects a stereoscopic image is achieved; compared with a stereoscopic projection device with double projectors, the single projector type stereoscopic projection system has the advantages of simple structure, simple circuit and low cost; and the contrapuntal problem of images projected by two projectors and the problem that the brightness decay is unbalanced are not necessary to be considered.
Description
Technical field
The invention belongs to stereo projection technology field, particularly relate to a kind of single projector formula stereo projection system, projector and driving method, utilize arrange in pairs or groups two vertically aligned liquid crystal light valves and rotatory polarization glasses of a projector to realize stereoprojection.
Background technology
Existing stereo projection technology general Liang Tai projector, fixing Left-hand circular polarization device and right-hand circular polarization device is installed respectively additional before two camera lenses, light is converted into Left-hand circular polarization and right-circularly polarized light, Liang Tai projector is projected in a screen simultaneously, can watch stereopsis after viewers wear circular polarizing disk glasses.This kind of mode needs Liang Tai projector exactitude position, to ensure the accuracy of projected position, and needs that the xenon lamp brightness of Liang Tai projector is basically identical and the rate of decay is basically identical, and use Liang Tai projector, cost is higher simultaneously.
Summary of the invention
First technical matters to be solved by this invention is the stereo projection system providing a kind of single projector formula, is intended to improve stereoprojection effect in the mode of single-throw shadow with low cost.
Second technical matters to be solved by this invention is to provide a kind of projector, is intended to improve stereoprojection effect.
3rd technical matters to be solved by this invention is to provide a kind of driving method to above-mentioned Double liquid crystal light valve, is intended to improve stereoprojection effect in the mode of single-throw shadow with low cost.
The present invention comprises along optical path direction successively for the stereo projection system of the single projector formula solving first technical matters and provide:
For alternately playing the projector that left-eye image and eye image, support frame rate are 100HZ or the more video playback of high frame rate rate; Described projector is digital micro-mirror formula projector, liquid crystal over silicon formula projector, liquid crystal display formula projector or laser-projection-type projector;
For the projection ray of described projector being converted to the linear polarizer of First Line polarized light;
First vertically aligned liquid crystal light valve, within the dynamic compensation time period of odd-numbered frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, overvoltage drive time of even frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of even frame keeps the polarization state of the second linearly polarized light to remain unchanged; Or, within the dynamic compensation time period of even frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of even frame remain unchanged, overvoltage drive time of odd-numbered frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of odd-numbered frame keeps the polarization state of the second linearly polarized light to remain unchanged;
Second vertically aligned liquid crystal light valve, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of odd-numbered frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, in even frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged; Or, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of even frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of even frame remain unchanged, in odd-numbered frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged;
Polarization state converter, it is positioned at the light emission side of described second vertically aligned liquid crystal light valve, for the First Line polarized light of described second vertically aligned liquid crystal light valve output and the second linearly polarized light are converted to left circularly polarized light and right-circularly polarized light respectively;
Projection screen, for the projection ray's catoptric imaging exported described polarization state converter, reflected light keeps the polarization state of the circularly polarized light exported from described polarization state converter;
For separating of the rotatory polarization glasses of the right and left eyes image that described projection screen reflects;
Described stereo projection system also comprises a synchronizing circuit, for extracting the frame rate synchronizing signal of right and left eyes image from described projector, and drives the first vertically aligned liquid crystal light valve and the second vertically aligned liquid crystal light valve according to extraction result.
The present invention comprises for the above-mentioned projector solving second technical matters and provide: for projection ray being converted to the linear polarizer of First Line polarized light; First vertically aligned liquid crystal light valve, within the dynamic compensation time period of odd-numbered frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, overvoltage drive time of even frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of even frame keeps the polarization state of the second linearly polarized light to remain unchanged; Or, within the dynamic compensation time period of even frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of even frame remain unchanged, overvoltage drive time of odd-numbered frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of odd-numbered frame keeps the polarization state of the second linearly polarized light to remain unchanged; Second vertically aligned liquid crystal light valve, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of odd-numbered frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, in even frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged; Or, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of even frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of even frame remain unchanged, in odd-numbered frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged; Polarization state converter, it is positioned at the light emission side of described second vertically aligned liquid crystal light valve, for the First Line polarized light of described second vertically aligned liquid crystal light valve output and the second linearly polarized light are converted to left circularly polarized light and right-circularly polarized light respectively.
The driving method to above-mentioned liquid crystal light valve that the present invention provides for solving the 3rd technical matters, comprises the steps:
Steps A, synchronizing circuit for generation of some drive voltage signal, and extracts the frame rate synchronizing signal of right and left eyes image in real time from projector;
Step B, synchronizing circuit drives the first vertically aligned liquid crystal light valve according to extraction result, to make within the dynamic compensation time period of odd-numbered frame (t1), in the time period outside the dynamic compensation of odd-numbered frame, the retardation of the liquid crystal molecule of (t2), the first vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero; The retardation of the liquid crystal molecule of overvoltage drive time period interior (t3) the first vertically aligned liquid crystal light valve of even frame rises to rapidly 1/2nd wavelength, and in the time period outside the overvoltage drive of even frame, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve keeps 1/2nd wavelength; Or within the dynamic compensation time period of even frame (t1), even frame dynamic compensation outside time period in (t2), the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero; The retardation of the liquid crystal molecule of overvoltage drive time period interior (t3) the first vertically aligned liquid crystal light valve of odd-numbered frame rises to rapidly 1/2nd wavelength, and outside the overvoltage drive of odd-numbered frame, in the time period, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve keeps 1/2nd wavelength;
Step C, synchronizing circuit is while execution step B, also the second vertically aligned liquid crystal light valve is driven, with in the time period outside the dynamic compensation making (t1), odd-numbered frame within the dynamic compensation time period of odd-numbered frame when (t2), even frame, the retardation of the liquid crystal molecule of the second vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, zero; Or within the dynamic compensation time period of even frame (t1), even frame dynamic compensation outside time period in (t2), odd-numbered frame time, the retardation of the liquid crystal molecule of the second vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, zero.
Employing provided by the invention two VA(Vertical Alignment Mode, vertically aligned) single projector stereo projection apparatus of liquid crystal light valve, achieve the mode of separate unit projector project stereoscopic image.Vertically aligned display mode has superelevation contrast, it is one of basic model in liquid crystal display, compared to the stereo projection apparatus of dual-projection machine, the utility model structure is simple, circuit is simple, cost is low, without the need to considering two projector's projected image alignment issues and the unbalanced problem of brightness decay.Due to VA type liquid crystal light valve when non-making alive without any optical delay amount, therefore can keep the polarization state of incident ray better, the contrast of whole stereo projection system is significantly increased, for spectators bring better 3D to experience.
Accompanying drawing explanation
Fig. 1 is the optical structure chart of the stereo projection system of single projector formula that the embodiment of the present invention provides;
Fig. 2 is the structural drawing of the first vertically aligned liquid crystal light valve of providing of the embodiment of the present invention and the second vertically aligned liquid crystal light valve;
Fig. 3 A, Fig. 3 B be respectively the embodiment of the present invention provide linear polarizer, the first vertically aligned liquid crystal light valve, the second vertically aligned liquid crystal light valve, polarization state converter optical axis relative angle schematic diagram;
Fig. 4 A, Fig. 4 B are the drive waveforms schematic diagram to the first vertically aligned liquid crystal light valve and the second vertically aligned liquid crystal light valve that the embodiment of the present invention provides respectively.
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.
In the present invention, to be arranged in pairs or groups two VA type liquid crystal light valves and support circuit by a projector, realize the project stereoscopic image of separate unit projector, high-contrast.
Fig. 1 shows the optical texture of the stereo projection system of single projector formula that the embodiment of the present invention provides, and for convenience of description, illustrate only part related to the present embodiment.With reference to Fig. 1, the stereo projection system of single projector formula that the embodiment of the present invention provides comprises successively along optical path direction: projector 1, the vertically aligned liquid crystal light valve 4 of linear polarizer the 2, first vertically aligned liquid crystal light valve 3, second, polarization state converter 5, projection screen 6, rotatory polarization glasses 7.
Wherein, projector 1 is for alternately playing left-eye image and eye image, such as play in the mode of frame sequential, first frame plays left-eye image, second frame plays eye image, the 3rd frame plays left-eye image again, and the 4th frame plays eye image again ..., by that analogy, from hardware, requirement can support that frame rate is the video playback of 100HZ or more high frame rate rate, can adopt digital micro-mirror formula projector, liquid crystal over silicon formula projector, liquid crystal display formula projector or laser-projection-type projector etc.
Linear polarizer 2 is for being converted to First Line polarized light by the projection ray of projector 1, specifically can adopt absorption-type linear polarization device, metal wire grating type linear polarization device, polarization splitting prism type, polarization beam splitter molded line polarizer or glass heap-type linear polarization device (normal adopt multilayer half reflection membrane structure), above-mentioned absorption-type linear polarization device be degree of polarization higher than 99% dye-type or iodine-type polarizer.In order to increase light utilization efficiency, also one deck antireflection film can be plated at the plane of light incidence of above-mentioned each linear polarizer.
Arrange in turn first vertically aligned liquid crystal light valve 3 and the output light that the second vertically aligned liquid crystal light valve 4 synchronous modulation is secondary by the odd-numbered frame of linear polarizer 2 and even frame is secondary.First vertically aligned liquid crystal light valve 3 is by the output light that odd-numbered frame is secondary and even frame is secondary of synchronous modulation linear polarizer 2, by from linear polarizer 2 through First Line polarized light be converted into second linearly polarized light vertical with First Line polarized light polarization direction, or any effect is not produced to First Line polarized light.Second vertically aligned liquid crystal light valve 4 is by the output light that odd-numbered frame is secondary and even frame is secondary of synchronous modulation linear polarizer 2, the first vertically aligned liquid crystal light valve 3 is coordinated to carry out optics dynamic compensation, the optic response speed of whole light valve system is improved with this, within the dynamic compensation time period by the second linearly polarized light revolution through the first vertically aligned liquid crystal light valve 3 for First Line polarized light, in section At All Other Times, any effect is not produced to the polarized light through itself.
Particularly, the first vertically aligned liquid crystal light valve 3 within the dynamic compensation time period of odd-numbered frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, overvoltage drive time of even frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of even frame keeps the polarization state of the second linearly polarized light to remain unchanged; Or, within the dynamic compensation time period of even frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of even frame remain unchanged, overvoltage drive time of odd-numbered frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of odd-numbered frame keeps the polarization state of the second linearly polarized light to remain unchanged.The polarization direction of the second linearly polarized light that described first vertically aligned liquid crystal light valve exports within the dynamic compensation time period of odd-numbered frame (t1) by the second vertically aligned liquid crystal light valve 4 is returned to turn 90 degrees and is converted to First Line polarized light, in time period outside the dynamic compensation of odd-numbered frame, the polarization state of the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) remains unchanged, when even frame, the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged, or, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of even frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of even frame remain unchanged, in odd-numbered frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged.
In the present embodiment, first vertically aligned liquid crystal light valve 3 and the second vertically aligned liquid crystal light valve 4 have identical structure, as shown in Figure 2, comprise glass substrate 9, silicon dioxide layer 10, indium tin oxide layer 11, oriented layer 12(are generally polyimide), liquid crystal layer 13, frame adhesive 14, liner particle 15; Wherein liquid crystal layer 13 thickness is generally less than 5 microns, and the optical delay amount of liquid crystal layer is generally greater than 250nm.Liquid crystal molecule, between 85 degree and 90 degree, can arrange with the direction perpendicular to glass baseplate surface by the tilt angle of oriented layer 12; VA type liquid crystal light valve liquid crystal used has negative dielectric anisotrop; Two VA type liquid crystal light valves adopt same design, have same delay amount and adopt the liquid crystal material of identical type; In order to improve the response speed of VA type liquid crystal light valve, also can be mixed into a certain proportion of polymkeric substance in liquid crystal material inside, after UV photopolymerization, form polymer network, effectively can improve the response speed of VA type liquid crystal, be referred to as the vertically aligned liquid crystal of polymer stabilizing type.
Polarization state converter 5 is positioned at the light emission side of described second vertically aligned liquid crystal light valve 4, is converted to left circularly polarized light and right-circularly polarized light respectively for the First Line polarized light that exported by the second vertically aligned liquid crystal light valve 4 and the second linearly polarized light.
Long axis of liquid crystal molecule projecting direction during activated state in (when institute's making alive is non-vanishing) above-mentioned first vertically aligned liquid crystal light valve 3 becomes 45 degree or negative 45 degree with the polarization direction of linear polarizer 2, and long axis of liquid crystal molecule projecting direction in the second vertically aligned liquid crystal light valve 4 is mutually vertical with the long axis of liquid crystal molecule projecting direction in the first vertically aligned liquid crystal light valve 3, wherein long axis of liquid crystal molecule direction is determined by the frictional direction of oriented layer 12.Above-mentioned polarization converter 5 can adopt one-quarter wavelength retardation film to realize, its optical axis direction is parallel with the long axis of liquid crystal molecule projecting direction in described first vertically aligned liquid crystal light valve during activated state, retardation scope is between 120nm ~ 150nm, and representative value is 125nm and 138nm.Fig. 3 A, Fig. 3 B are four optical axis relative angle contrasts, in Fig. 3 A, the polarization direction of linear polarization side's device 2 is 16, the long axis of liquid crystal molecule projecting direction of the first vertically aligned liquid crystal light valve 3 is 17, long axis of liquid crystal molecule projecting direction in second vertically aligned liquid crystal light valve 4 is 18, the optical axis direction of one-quarter wavelength retardation film 5 is 19, direction 16 and direction 17 angle 45 degree, direction 17 is vertical with direction 18, and direction 17 is parallel with direction 19.In Fig. 3 B, the polarization direction of linear polarization side's device 2 is 16, the long axis of liquid crystal molecule projecting direction of the first vertically aligned liquid crystal light valve 3 is 20, long axis of liquid crystal molecule projecting direction in second vertically aligned liquid crystal light valve 4 is 21, and the optical axis direction of one-quarter wavelength retardation film 5 is 22.Direction 16 and negative 45 degree of direction 20 angle, direction 20 is vertical with direction 21, and direction 20 is parallel with direction 22.
Projection screen 6 carries out catoptric imaging for the circularly polarized light projection ray exported polarization state converter 5, left images is reflexed to rotatory polarization glasses 7, reflected light maintains the polarization state of the circularly polarized light exported from polarization state converter 5, and rotatory polarization glasses 7 are again by right and left eyes separation of images.Above-mentioned projection screen 6 must be metal screen, and general gain coefficient is more than 1.5, and Typical ranges is between 1.8 ~ 2.5, and incident polarization light, after the reflection of metal screen, can keep the polarization state of incident polarized light, substantially occurs without moving back polarization phenomena.Right and left eyes corresponding left-handed rotatory polarization sheet and the dextrorotation rotatory polarization sheet respectively of rotatory polarization glasses 7, be specifically as follows the corresponding left-handed rotatory polarization sheet of left eye, right eye corresponding dextrorotation rotatory polarization sheet, or left eye corresponding dextrorotation rotatory polarization sheet, the corresponding left-handed rotatory polarization sheet of right eye conversely.
As described above, projector 1 is for alternately playing the projector of left-eye image and eye image, when specific works, be the image coordinating projector specifically to play, need to drive accordingly the vertically aligned liquid crystal light valve 4 of the first vertically aligned liquid crystal light valve 3, second.Therefore above-mentioned stereo projection system also comprises a synchronizing circuit 8, for extracting the frame rate synchronizing signal of right and left eyes image from projector 1, and drive the first vertically aligned liquid crystal light valve 3 and the second vertically aligned liquid crystal light valve 4 according to the generation of extraction result in dynamic compensation mode.Drive waveforms is respectively shown in Fig. 4 A and Fig. 4 B.
The vertically aligned liquid crystal light valve 4 of above-mentioned linear polarizer the 2, first vertically aligned liquid crystal light valve 3, second, polarization state converter 5, synchronizing circuit 8 can be placed on outside projector 1, as the peripheral components of projector, also can be built among projector 1.
Hereafter composition graphs 1 and Fig. 4 A, Fig. 4 B principle of work to above-mentioned optical projection system are described in detail.First, before linear polarizer 2 being located at projector 1 camera lens, first vertically aligned liquid crystal light valve 3 is positioned at the outside (projector 1 camera lens side is defined as inner side) of linear polarizer 2, second vertically aligned liquid crystal light valve 4 is positioned at the outside of the first vertically aligned liquid crystal light valve 3, and the outside of the second vertically aligned liquid crystal light valve 4 pastes one-quarter wavelength retardation film 5.Video input signals divides right and left eyes picture signal, and alternate transport is to projector 1 successively, and projector 1 plays left eye picture and right eye picture successively according to sequential manner, i.e. right and left eyes picture corresponding odd-numbered frame picture and even frame picture respectively; The light that projector 1 sends is successively after the vertically aligned liquid crystal light valve 4 of linear polarizer the 2, first vertically aligned liquid crystal light valve 3, second, wave retardation film 5, project on projection screen 6, light is through the reflection of projection screen 6, light still keeps circularly polarized state, viewers wear rotatory polarization glasses 7 can see left-eye image and eye image respectively, realize being separated of left-eye image and eye image, thus realize 3D display.
It is T that projector plays a frame picture required time, and left eye picture and right eye picture carry out loop play in order successively, respectively corresponding odd-numbered frame and even frame; The light valve system be made up of two VA type liquid crystal light valves and one-quarter wavelength retardation film 5 carries out synchronous modulation to the light of every frame picture respectively, makes the corresponding different polarization state of odd-numbered frame and the light of even frame.
Present invention also offers the method that the liquid crystal light valve in above-mentioned stereo projection system is driven, comprise the steps:
Steps A, synchronizing circuit for generation of some drive voltage signal, and extracts the frame rate synchronizing signal of right and left eyes image in real time from projector;
Step B, synchronizing circuit drives the first vertically aligned liquid crystal light valve according to extraction result, in time period to make within the dynamic compensation time period of odd-numbered frame, outside the dynamic compensation of odd-numbered frame, even frame time, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve be respectively 1/2nd wavelength, zero, 1/2nd wavelength; Or in the time period within the dynamic compensation time period of even frame, outside the dynamic compensation of even frame, odd-numbered frame time, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve be respectively 1/2nd wavelength, zero, 1/2nd wavelength;
Step C, synchronizing circuit is while execution step B, also the second vertically aligned liquid crystal light valve is driven, in time period to make within the dynamic compensation time period of odd-numbered frame, outside the dynamic compensation of odd-numbered frame, even frame time, the retardation of the liquid crystal molecule of the second vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, zero; Or in the time period within the dynamic compensation time period of even frame, outside the dynamic compensation of even frame, odd-numbered frame time, the retardation of the liquid crystal molecule of the second vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, zero.
Can be the corresponding left-eye image of odd-numbered frame, even frame corresponding eye image during specific implementation, also can be the corresponding eye image of odd-numbered frame, the corresponding left-eye image of even frame.
With reference to Fig. 4 A, Fig. 4 B, the drive voltage signal that synchronizing circuit produces comprises according to order from big to small: positive high voltage V2, secondary positive high voltage V1, no-voltage 0, secondary negative high voltage-V1, negative high voltage-V2, wherein the t1 time is the dynamic compensation time, at this moment, the first vertically aligned liquid crystal light valve 3 keeps+V1 voltage, second vertically aligned liquid crystal light valve 4 is driven into vertically aligned liquid crystal light valve 3 equal state with first from original 0V, all keeps the voltage of+V1; After the t1 time terminates, the voltage of two light valves is reduced to 0V simultaneously, and now the first vertically aligned liquid crystal light valve 3 is consistent with the liquid crystal molecule dynamic response in the second vertically aligned liquid crystal light valve 4, and its optical states compensates mutually; Light through the second vertically aligned liquid crystal light valve 4 is linearly polarized photon, and polarization direction is consistent with the polarization direction of linear polarizer 2; Within the t2 time period, the liquid crystal molecule in two light valves returns to plumbness during 0V voltage; Light through the second vertically aligned liquid crystal light valve 4 is still linearly polarized photon, and the polarization direction of polarization direction and linear polarizer 2 is still consistent; The t3 time is overvoltage drive time of the first vertically aligned liquid crystal light valve 3, within the t3 time period, on first vertically aligned liquid crystal light valve 3, institute's making alive is high voltage+V2, for the retardation of the first vertically aligned liquid crystal light valve 3 is driven into 1/2 wavelength at short notice; When the retardation of the first vertically aligned liquid crystal light valve 3 reaches 1/2 wavelength, the t3 time terminates; The voltage of the first vertically aligned liquid crystal light valve 3 switches to+V1 at once, and enter in the t4 time period, voltage+V1 is for keeping the retardation of the first vertically aligned liquid crystal light valve 3 to be 1/2 wavelength; Second vertically aligned liquid crystal light valve 4 all keeps 0V within t3 and the t4 time; Therefore the light through the first vertically aligned liquid crystal light valve 3 is still linearly polarized photon, and polarization direction be have rotated 90 degree by the first vertically aligned liquid crystal light valve 3, and polarization direction is vertical with the polarization direction of linear polarizer 2.In second vertically aligned liquid crystal light valve 4, liquid crystal molecule is plumbness, without retardation, do not change the polarization state of transmitted light, the light therefore through the second vertically aligned liquid crystal light valve 4 is still linearly polarized photon, and polarization direction is vertical with the polarization direction of linear polarizer 2.T1 and t2 sum equals T, and t3 and t4 sum also equals T, and time T is projector and shows time needed for a frame picture; So far, a drive cycle terminates, and each drive cycle comprises two frames, and the cycle is 2T.The corresponding relation between voltage corresponding in each time period and the polarization state of retardation and emergent light is listed in table 1.
After one-period terminates, the positive negative level of drive waveforms being exchanged mutually, for avoiding liquid crystal cell accumulated inside to cross multi-charge, realizing exchanging driving.
From the light that the second vertically aligned liquid crystal light valve 4 penetrates, circularly polarized light is converted into after one-quarter wavelength retardation film 5, because within the different frame time, the polarization direction of emergent light is mutually vertical, and become 45 degree or negative 45 degree of angles with the optical axis direction of one-quarter wavelength retardation film 5, thus make to form left circularly polarized light and right-circularly polarized light respectively in the different frame time; After metal screen 6 is reflected, light still keeps circularly polarized state; Viewers wear rotatory polarization glasses 7 can see left-eye image and eye image respectively, realize being separated of left-eye image and eye image, thus realize 3D display.
The present invention is owing to have employed overvoltage drive technology and dynamic response compensation technique, the optical system of two liquid crystal light valve compositions is when carrying out different optical state change, there is very high response speed, make optical response time be reduced to 100 delicate below, thus make whole stereo projection apparatus can support higher frame rate, obviously can improve the conditions of streaking of high-speed motion picture.And compared to the stereo projection system of dual-projection machine, structure of the present invention is simple, and circuit is simple, and cost is low, without the need to considering two projector's projected image alignment issues.Compared with the two light valve stereo projection apparatus of optics self compensation flexure type, there is higher response speed, higher contrast, more preferably stereo display effect.
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 (9)
1. the stereo projection system of a Zhong Dan projector formula, it is characterized in that, described stereo projection system comprises successively along optical path direction:
For alternately playing the projector that left-eye image and eye image, support frame rate are 100HZ or the more video playback of high frame rate rate; Described projector is digital micro-mirror formula projector, liquid crystal over silicon formula projector, liquid crystal display formula projector or laser-projection-type projector;
For the projection ray of described projector being converted to the linear polarizer of First Line polarized light;
First vertically aligned liquid crystal light valve, within the dynamic compensation time period of odd-numbered frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, overvoltage drive time of even frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of even frame keeps the polarization state of the second linearly polarized light to remain unchanged; Or, within the dynamic compensation time period of even frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of even frame remain unchanged, overvoltage drive time of odd-numbered frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of odd-numbered frame keeps the polarization state of the second linearly polarized light to remain unchanged;
Second vertically aligned liquid crystal light valve, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of odd-numbered frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, in even frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged; Or, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of even frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of even frame remain unchanged, in odd-numbered frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged;
Polarization state converter, it is positioned at the light emission side of described second vertically aligned liquid crystal light valve, for the First Line polarized light of described second vertically aligned liquid crystal light valve output and the second linearly polarized light are converted to left circularly polarized light and right-circularly polarized light respectively;
Projection screen, for the projection ray's catoptric imaging exported described polarization state converter, reflected light keeps the polarization state of the circularly polarized light exported from described polarization state converter;
For separating of the rotatory polarization glasses of the right and left eyes image that described projection screen reflects;
Described stereo projection system also comprises a synchronizing circuit, for extracting the frame rate synchronizing signal of right and left eyes image from described projector, and drives the first vertically aligned liquid crystal light valve and the second vertically aligned liquid crystal light valve according to extraction result.
2. the stereo projection system of single projector as claimed in claim 1 formula, it is characterized in that, described linear polarizer, the first vertically aligned liquid crystal light valve, the second vertically aligned liquid crystal light valve, polarization state converter, synchronizing circuit are built in described projector or are placed on outside described projector.
3. the stereo projection system of single projector as claimed in claim 1 formula, it is characterized in that, described linear polarizer is absorption-type linear polarization device, metal wire grating type linear polarization device, polarization splitting prism type, polarization beam splitter molded line polarizer or glass heap-type linear polarization device; Described absorption-type linear polarization device be degree of polarization higher than 99% dye-type or iodine-type polarizer.
4. the stereo projection system of single projector as claimed in claim 1 formula, is characterized in that, the thickness of liquid crystal layer of described first vertically aligned liquid crystal light valve and/or the second vertically aligned liquid crystal light valve is less than 5 microns, and optical delay amount is greater than 250nm.
5. the stereo projection system of single projector as claimed in claim 1 formula, is characterized in that, the long axis of liquid crystal molecule projecting direction in the first vertically aligned liquid crystal light valve described in during activated state becomes 45 degree or negative 45 degree with the polarization direction of described linear polarizer; Long axis of liquid crystal molecule projecting direction in described second vertically aligned liquid crystal light valve is mutually vertical with the long axis of liquid crystal molecule projecting direction in described first vertically aligned liquid crystal light valve.
6. the stereo projection system of single projector as claimed in claim 1 formula, it is characterized in that, described polarization state converter is an one-quarter wavelength retardation film, its optical axis direction is parallel with the long axis of liquid crystal molecule projecting direction in described first vertically aligned liquid crystal light valve during activated state, and retardation scope is between 120nm ~ 150nm.
7. a projector, is characterized in that, comprising:
For projection ray being converted to the linear polarizer of First Line polarized light;
First vertically aligned liquid crystal light valve, within the dynamic compensation time period of odd-numbered frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, overvoltage drive time of even frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of even frame keeps the polarization state of the second linearly polarized light to remain unchanged; Or, within the dynamic compensation time period of even frame (t1) the polarization direction 90-degree rotation of described First Line polarized light is converted to (t2) polarization state to described First Line polarized light in the second linearly polarized light, time period outside the dynamic compensation of even frame remain unchanged, overvoltage drive time of odd-numbered frame the polarization direction 90-degree rotation of described First Line polarized light is converted to the second linearly polarized light, time outside the overvoltage drive of odd-numbered frame keeps the polarization state of the second linearly polarized light to remain unchanged;
Second vertically aligned liquid crystal light valve, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of odd-numbered frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of odd-numbered frame remain unchanged, in even frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged; Or, the polarization direction of the second linearly polarized light described first vertically aligned liquid crystal light valve exported within the dynamic compensation time period of even frame (t1) return turn 90 degrees the polarization state being converted to the First Line polarized light that the first vertically aligned liquid crystal light valve exports by (t2) in First Line polarized light, time period outside the dynamic compensation of even frame remain unchanged, in odd-numbered frame time the polarization state of the second linearly polarized light that the first vertically aligned liquid crystal light valve exports is remained unchanged;
Polarization state converter, it is positioned at the light emission side of described second vertically aligned liquid crystal light valve, for the First Line polarized light of described second vertically aligned liquid crystal light valve output and the second linearly polarized light are converted to left circularly polarized light and right-circularly polarized light respectively.
8., to a driving method for the liquid crystal light valve in such as any one of claim 1 to 6, it is characterized in that, comprise the steps:
Steps A, synchronizing circuit for generation of some drive voltage signal, and extracts the frame rate synchronizing signal of right and left eyes image in real time from projector;
Step B, synchronizing circuit drives the first vertically aligned liquid crystal light valve according to extraction result, to make within the dynamic compensation time period of odd-numbered frame (t1), in the time period outside the dynamic compensation of odd-numbered frame, the retardation of the liquid crystal molecule of (t2), the first vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero; The retardation of the liquid crystal molecule of overvoltage drive time period interior (t3) the first vertically aligned liquid crystal light valve of even frame rises to rapidly 1/2nd wavelength, and in the time period outside the overvoltage drive of even frame, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve keeps 1/2nd wavelength; Or within the dynamic compensation time period of even frame (t1), even frame dynamic compensation outside time period in (t2), the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero; The retardation of the liquid crystal molecule of overvoltage drive time period interior (t3) the first vertically aligned liquid crystal light valve of odd-numbered frame rises to rapidly 1/2nd wavelength, and outside the overvoltage drive of odd-numbered frame, in the time period, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve keeps 1/2nd wavelength;
Step C, synchronizing circuit is while execution step B, also the second vertically aligned liquid crystal light valve is driven, with in the time period outside the dynamic compensation making (t1), odd-numbered frame within the dynamic compensation time period of odd-numbered frame when (t2), even frame, the retardation of the liquid crystal molecule of the second vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, zero; Or within the dynamic compensation time period of even frame (t1), even frame dynamic compensation outside time period in (t2), odd-numbered frame time, the retardation of the liquid crystal molecule of the second vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, zero.
9. driving method as claimed in claim 8, is characterized in that, the drive voltage signal that described synchronizing circuit produces comprises according to order from big to small: positive high voltage, secondary positive high voltage, no-voltage, secondary negative high voltage, negative high voltage;
In described step B, synchronizing circuit respectively within the dynamic compensation time period of odd-numbered frame (t1) in proper order positive high voltage/time negative high voltage, odd-numbered frame dynamic compensation outside time period in (t2) drive the first vertically aligned liquid crystal light valve with (t3) in the overvoltage drive time period of no-voltage, even frame with (t4) in the time period outside the overvoltage drive of positive high voltage/negative high voltage, even frame the following positive high voltage/time negative high voltage; Or, synchronizing circuit respectively within the dynamic compensation time period of even frame (t1) with (t2) in the time period outside the dynamic compensation of positive high voltage/time negative high voltage, even frame with (t3) in the overvoltage drive time period of no-voltage, odd-numbered frame with (t4) in the time period outside the overvoltage drive of positive high voltage/negative high voltage, odd-numbered frame in proper order positive high voltage/time negative high voltage drive the first vertically aligned liquid crystal light valve;
In described step C, synchronizing circuit respectively within the dynamic compensation time period of odd-numbered frame (t1) in proper order positive high voltage/time negative high voltage, odd-numbered frame dynamic compensation outside time period in (t2) to drive the second vertically aligned liquid crystal light valve with no-voltage when no-voltage, even frame; Or (t2) is to drive the second vertically aligned liquid crystal light valve with no-voltage when no-voltage, odd-numbered frame in the time period outside the dynamic compensation of synchronizing circuit within the dynamic compensation time period of even frame (t1) the following positive high voltage/time negative high voltage, even frame.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210005018.1A CN102540696B (en) | 2012-01-06 | 2012-01-06 | Single projector type stereoscopic projection system, projector and driving method |
| PCT/CN2012/071672 WO2013102318A1 (en) | 2012-01-06 | 2012-02-27 | Single projector type stereographic projection system, projector and drive method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210005018.1A CN102540696B (en) | 2012-01-06 | 2012-01-06 | Single projector type stereoscopic projection system, projector and driving method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102540696A CN102540696A (en) | 2012-07-04 |
| CN102540696B true CN102540696B (en) | 2015-07-22 |
Family
ID=46347883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210005018.1A Active CN102540696B (en) | 2012-01-06 | 2012-01-06 | Single projector type stereoscopic projection system, projector and driving method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102540696B (en) |
| WO (1) | WO2013102318A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293756B (en) * | 2013-05-30 | 2016-08-10 | 京东方科技集团股份有限公司 | A kind of display processing unit, system and method |
| CN104950562B (en) * | 2014-03-24 | 2017-03-01 | 台达电子工业股份有限公司 | Projection arrangement |
| WO2018180769A1 (en) * | 2017-03-31 | 2018-10-04 | 日本電気株式会社 | Work support system and protective eyeglasses |
| CN111505895A (en) * | 2020-05-14 | 2020-08-07 | 中影光峰激光影院技术（北京）有限公司 | Stereoscopic projection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101025476A (en) * | 2006-02-22 | 2007-08-29 | 三星电子株式会社 | High resolution autostereoscopic display |
| CN101313595A (en) * | 2005-07-11 | 2008-11-26 | iz3D有限公司 | Two-panel liquid crystal system with circular polarization and polarizer glasses suitable for three dimensional imaging |
| CN101788756A (en) * | 2010-03-25 | 2010-07-28 | 河北工业大学 | Stereoprojection device of single projector with single liquid crystal light valve |
| CN101806995A (en) * | 2010-03-25 | 2010-08-18 | 河北工业大学 | Three-dimensional projecting apparatus with double liquid crystal light valves and single projector |
| CN101950100A (en) * | 2010-09-14 | 2011-01-19 | 福建华映显示科技有限公司 | Three-dimensional image display device and three-dimensional image signal control method |
| CN202631945U (en) * | 2012-01-06 | 2012-12-26 | 深圳秋田微电子有限公司 | Single projector type stereo projection system and projector |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101398537A (en) * | 2007-09-25 | 2009-04-01 | 鸿富锦精密工业（深圳）有限公司 | Stereo projection optical system |
| CN101790062B (en) * | 2010-03-25 | 2013-05-08 | 深圳市时代华影科技开发有限公司 | Stereoprojection device of single projector with single liquid crystal light valve |
| CN102253497B (en) * | 2011-07-20 | 2014-04-30 | 清华大学深圳研究生院 | Polarizing type stereo projector engine |
-
2012
- 2012-01-06 CN CN201210005018.1A patent/CN102540696B/en active Active
- 2012-02-27 WO PCT/CN2012/071672 patent/WO2013102318A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101313595A (en) * | 2005-07-11 | 2008-11-26 | iz3D有限公司 | Two-panel liquid crystal system with circular polarization and polarizer glasses suitable for three dimensional imaging |
| CN101025476A (en) * | 2006-02-22 | 2007-08-29 | 三星电子株式会社 | High resolution autostereoscopic display |
| CN101788756A (en) * | 2010-03-25 | 2010-07-28 | 河北工业大学 | Stereoprojection device of single projector with single liquid crystal light valve |
| CN101806995A (en) * | 2010-03-25 | 2010-08-18 | 河北工业大学 | Three-dimensional projecting apparatus with double liquid crystal light valves and single projector |
| CN101950100A (en) * | 2010-09-14 | 2011-01-19 | 福建华映显示科技有限公司 | Three-dimensional image display device and three-dimensional image signal control method |
| CN202631945U (en) * | 2012-01-06 | 2012-12-26 | 深圳秋田微电子有限公司 | Single projector type stereo projection system and projector |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013102318A1 (en) | 2013-07-11 |
| CN102540696A (en) | 2012-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8794764B2 (en) | Stereoscopic projection system employing spatial multiplexing at an intermediate image plane | |
| US20110032483A1 (en) | Multi-segment optical retarder for creating 3d images | |
| CN205787403U9 (en) | Stereo projection device capable of improving light utilization rate | |
| EA030953B1 (en) | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency | |
| CN201615988U (en) | Stereoprojection device of single projector of single-liquid-crystal light valve | |
| CN102804058B (en) | Wide field-of-view stereoscopic projection system | |
| CN102540696B (en) | Single projector type stereoscopic projection system, projector and driving method | |
| US20180131929A1 (en) | High brightness stereoscopic image screening device using modulator asymmetry drive, and method for operating same | |
| CN202631942U (en) | Double-liquid-crystal light-valve single-projector type stereo projection system and projector | |
| CN101788756A (en) | Stereoprojection device of single projector with single liquid crystal light valve | |
| CN102566249B (en) | Stereo projection system with single projector and dual liquid crystal light valves, projector and driving method | |
| CN202631945U (en) | Single projector type stereo projection system and projector | |
| CN202453645U (en) | Double-liquid-crystal-light-valve single-projector type stereo projection system and projector | |
| CN202631941U (en) | Double-liquid crystal light-valve single projector type stereo projection system and projector | |
| US20200089016A1 (en) | High brightness stereoscopic 3d projection system | |
| US11531212B2 (en) | Stereoscopic 3D system using linear polarization | |
| CN204009346U (en) | Stereo projection system | |
| US20130170030A1 (en) | Stereoscopic display apparatus | |
| CN201615987U (en) | Stereoprojection device of single projector of single-liquid-crystal light valve | |
| CN101790062B (en) | Stereoprojection device of single projector with single liquid crystal light valve | |
| CN201681249U (en) | Stereoscopic projection device with double liquid crystal light valve and single projector | |
| CN202372750U (en) | Single-lens double-liquid crystal screen polarized light three-dimensional (3D) projector | |
| CN203630503U (en) | Dual optical path type 3D imaging device | |
| TWI442097B (en) | Polarization converting element group for projection apparatus and projection apparatus | |
| CN203688986U (en) | 3D imaging equipment using polarization spectroscope to reduce light loss |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000, 39 Jin Yuan Road, Henggang street, Shenzhen street, Longgang District, Guangdong, China Patentee after: Akita Shenzhen microelectronics Limited by Share Ltd Address before: Shenzhen City District of 518000 province heao Golden Industrial Zone Jin Road No. 39 Patentee before: Shenzhen AV-Display Co., Ltd. |
|
| CP03 | Change of name, title or address |