CN202631945U - Single projector type stereo projection system and projector - Google Patents
Single projector type stereo projection system and projector Download PDFInfo
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- CN202631945U CN202631945U CN2012200073206U CN201220007320U CN202631945U CN 202631945 U CN202631945 U CN 202631945U CN 2012200073206 U CN2012200073206 U CN 2012200073206U CN 201220007320 U CN201220007320 U CN 201220007320U CN 202631945 U CN202631945 U CN 202631945U
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Abstract
The utility model provides a double-liquid crystal light-valve single-projector type stereo projection system, applicable to the stereo projection technology field. The single projector type stereo projection system comprises a projector, a linear polarizer, a first vertical arrangement type liquid crystal light valve, a second vertical arrangement type liquid crystal light valve, a polarization state converter, a projection screen, rotatory polarization glasses, and a synchronous circuit which are sequentially arranged along the optical path direction. The double-vertical-arrangement type liquid crystal light-valve type single projector stereo projection arrangement of the utility model realize the mode of stereo image projection with a single projector. Compared with the stereo projection arrangement with double projectors, the single projector type stereo projection system of the utility model features simple structure, simple circuit, and low cost, with no need to considerate the alignment of the projection images of two projectors and the imbalance of the brightness attenuation.
Description
Technical field
The utility model belongs to the stereo projection technology field, relates in particular to a kind of single projector formula stereo projection system and projector, utilizes two vertically aligned liquid crystal light valves of projector's collocation and rotatory polarization glasses to realize stereoprojection.
Background technology
Existing two projectors of stereo projection technology general using; Install fixing Left-hand circular polarization device and right-hand circular polarization device before two camera lenses respectively additional; Light is converted into Left-hand circular polarization and right-circularly polarized light; Two projectors are projected in the screen simultaneously, can watch stereopsis behind the viewers wear circular polarizing disk glasses.This kind mode needs two accurate contrapositions of projector, with the accuracy of assurance projected position, and needs two projector's xenon lamp brightness basically identicals and rate of decay basically identical, uses two projectors simultaneously, and cost is higher.
The utility model content
The utility model first technical matters to be solved is to provide the stereo projection system of a kind of single projector formula, is intended to improve the stereoprojection effect with the mode of single-throw shadow with low cost.
The utility model second technical matters to be solved is to provide a kind of projector, is intended to improve the stereoprojection effect.
The utility model comprises along optical path direction for the stereo projection system of single projector formula of solving first technical matters and providing successively:
Be used for alternately playing left-eye image and eye image, support that frame rate is the projector of the video playback of 100HZ or higher frame rate; Said projector is digital micro-mirror formula projector, liquid crystal over silicon formula projector, liquid crystal display formula projector or laser projection formula projector;
Be used for the projection ray of said projector is converted into the linear polarizer of first linearly polarized light;
The first vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be converted into from first linearly polarized light that linear polarizer sees through and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps first linearly polarized light not produced any effect;
The second vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be first linearly polarized light at dynamic compensation through second linearly polarized light revolution of the first vertically aligned liquid crystal light valve in time period, the polarized light through itself not produced any effect at dynamic compensation in the time period outside the time;
Polarization state converter, the bright dipping side that it is positioned at the said second vertically aligned liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of the said second vertically aligned liquid crystal light valve output into left circularly polarized light and right-circularly polarized light respectively;
Projection screen is used for the projection ray's catoptric imaging to said polarization state converter output, and reflected light keeps from the circular polarization polarized state of light of said polarization state converter output;
Be used to separate the rotatory polarization glasses of the right and left eyes image of said projection screen reflection;
Said stereo projection system also comprises a synchronizing circuit, is used for extracting from said projector the frame rate synchronizing signal of right and left eyes image, and drives the first vertically aligned liquid crystal light valve and the second vertically aligned liquid crystal light valve according to extracting the result.
Further, the said first vertically aligned liquid crystal light valve be used for dynamic compensation in odd-numbered frame in the time period t1 polarization direction of said first linearly polarized light is revolved turn 90 degrees that t2 remains unchanged to the said first linear polarization polarized state of light in the time period that converts into outside second linearly polarized light, the dynamic compensation in odd-numbered frame, in the overvoltage drive time of even frame the polarization direction of said first linearly polarized light revolved and turn 90 degrees the time that converts into outside second linearly polarized light, the overvoltage drive and keep the second linear polarization polarized state of light to remain unchanged in even frame; Perhaps, the dynamic compensation of even frame in the time period t1 polarization direction of said first linearly polarized light is revolved turn 90 degrees that t2 remains unchanged to the said first linear polarization polarized state of light in the time period that converts into outside second linearly polarized light, the dynamic compensation in even frame, in the overvoltage drive time of odd-numbered frame the polarization direction of said first linearly polarized light revolved and turn 90 degrees the time that converts into outside second linearly polarized light, the overvoltage drive and keep the second linear polarization polarized state of light to remain unchanged in odd-numbered frame;
The said second vertically aligned liquid crystal light valve be used for dynamic compensation in odd-numbered frame in the time period t1 polarization direction of second linearly polarized light of the said first vertically aligned liquid crystal light valve output returned to turn 90 degrees convert first linearly polarized light into; T2 remains unchanged the first linear polarization polarized state of light of the first vertically aligned liquid crystal light valve output in time period outside the dynamic compensation of odd-numbered frame; The second linear polarization polarized state of light to the first vertically aligned liquid crystal light valve output when even frame remains unchanged; Perhaps, be used for dynamic compensation in even frame in the time period t1 with the polarization direction of second linearly polarized light of the said first vertically aligned liquid crystal light valve output return turn 90 degrees t2 in the time period that converts into outside first linearly polarized light, the dynamic compensation in even frame with the first linear polarization polarized state of light of the first vertically aligned liquid crystal light valve output remain unchanged, the second linear polarization polarized state of light to the first vertically aligned liquid crystal light valve output during in odd-numbered frame remains unchanged.
Further, said 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 the said projector or are placed on outside the said projector.
Further, said linear polarizer is absorption-type linear polarization device, metal wire grating type linear polarization device, polarization splitting prism type, polarization beam splitter molded lines polarizer or glass heap molded lines polarizer; Said absorption-type linear polarization device is that degree of polarization is higher than 99% dye-type or iodine-type polarizer.
Further, the thickness of liquid crystal layer of the said first vertically aligned liquid crystal light valve and/or the second vertically aligned liquid crystal light valve is less than 5 microns, and the optical delay amount is generally greater than 250nm.
Further, the long axis of liquid crystal molecule projecting direction in the said first vertically aligned liquid crystal light valve becomes 45 degree or negative 45 degree with the polarization direction of said linear polarizer during activated state; Long axis of liquid crystal molecule projecting direction in the said second vertically aligned liquid crystal light valve is vertical each other with long axis of liquid crystal molecule projecting direction in the said first vertically aligned liquid crystal light valve.
Further, said polarization state converter is an one-quarter wavelength retardation film, and the long axis of liquid crystal molecule projecting direction in its optical axis direction and the said first vertically aligned liquid crystal light valve during activated state is parallel, and the retardation scope is between 120nm～150nm.
The utility model comprises for the above-mentioned projector that solves second technical matters and provide: the linear polarizer that is used for the projection ray of said projector is converted into first linearly polarized light; The first vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be converted into from first linearly polarized light that linear polarizer sees through and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps first linearly polarized light not produced any effect; The second vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be first linearly polarized light at dynamic compensation through second linearly polarized light revolution of the first vertically aligned liquid crystal light valve in time period, the polarized light through itself not produced any effect in the time period outside dynamic compensation; Polarization state converter, the bright dipping side that it is positioned at the said second vertically aligned liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of the said second vertically aligned liquid crystal light valve output into left circularly polarized light and right-circularly polarized light respectively.
Single projector stereo projection apparatus of two VA of the employing that the utility model provides (Vertical Alignment Mode, vertically aligned) liquid crystal light valve has been realized the mode of separate unit projector project stereoscopic image.Vertically aligned display mode has the superelevation contrast; It is one of basic model in the liquid crystal display; Than the stereo projection apparatus of dual-projection machine, the utility model is simple in structure, and circuit is simple; Cost is low, need not to consider two projector's projected image contraposition problems and the unbalanced problem of brightness decay.Because VA type liquid crystal light valve has no the optical delay amount when making alive not, therefore can keep the polarization state of incident ray better, the contrast of whole stereo projection system is significantly increased, for bringing better 3D, spectators experience.
Description of drawings
Fig. 1 is the optical structure chart of the stereo projection system of single projector formula of providing of the utility model embodiment;
Fig. 2 is the first vertically aligned liquid crystal light valve that provides of the utility model embodiment and the structural drawing of the second vertically aligned liquid crystal light valve;
Fig. 3 A, Fig. 3 B are respectively the optical axis relative angle synoptic diagram of the linear polarizer that provides of the utility model embodiment, the first vertically aligned liquid crystal light valve, the second vertically aligned liquid crystal light valve, polarization state converter;
Fig. 4 A, Fig. 4 B are respectively the drive waveforms synoptic diagram to the first vertically aligned liquid crystal light valve and the second vertically aligned liquid crystal light valve that the utility model embodiment provides.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model,, realize the project stereoscopic image of separate unit projector, high-contrast through two VA type liquid crystal light valves of projector's collocation and support circuit.
Fig. 1 shows the optical texture of the stereo projection system of single projector formula that the utility model embodiment provides, and for the ease of describing, only shows the part relevant with present embodiment.With reference to Fig. 1, the stereo projection system of single projector formula that the utility model embodiment provides comprises along optical path direction successively: the vertically aligned liquid crystal light valve of the vertically aligned liquid crystal light valve of projector 1, linear polarizer 2, first 3, second 4, polarization state converter 5, projection screen 6, rotatory polarization glasses 7.
Wherein, projector 1 is used for alternately playing left-eye image and eye image, for example plays with the mode of frame sequential; First frame is play left-eye image; Second frame is play eye image, the 3rd frame is play left-eye image again, and the 4th frame is play eye image again ..., by that analogy; Requirement can support that frame rate is the video playback of 100HZ or higher frame rate from the hardware, can adopt digital micro-mirror formula projector, liquid crystal over silicon formula projector, liquid crystal display formula projector or laser projection formula projector etc.
The first vertically aligned liquid crystal light valve of arranging in order 3 and second vertically aligned liquid crystal light valve 4 synchronous modulation are with the output light that odd-numbered frame is inferior and even frame is inferior of linear polarizer 2.The first vertically aligned liquid crystal light valve 3 is through the output light that odd-numbered frame is inferior and even frame is inferior of synchronous modulation linear polarizer 2; To be converted into second linearly polarized light vertical from first linearly polarized light that linear polarizer 2 sees through, perhaps first linearly polarized light not produced any effect with the first linearly polarized light polarization direction.The second vertically aligned liquid crystal light valve 4 is through the output light that odd-numbered frame is inferior and even frame is inferior of synchronous modulation linear polarizer 2; Cooperate the first vertically aligned liquid crystal light valve 3 to carry out the optics dynamic compensation; Improve the optic response speed of overall optical valve system with this; To be first linearly polarized light at dynamic compensation through second linearly polarized light revolution of the first vertically aligned liquid crystal light valve 3 in time period, the polarized light through itself not produced any effect in the section At All Other Times.
Particularly, the first vertically aligned liquid crystal light valve 3 be used for dynamic compensation in odd-numbered frame in the time period (t1) polarization direction of said first linearly polarized light is revolved turn 90 degrees that (t2) remains unchanged to the said first linear polarization polarized state of light in the time period that converts into outside second linearly polarized light, the dynamic compensation in odd-numbered frame, in the overvoltage drive time of even frame the polarization direction of said first linearly polarized light revolved and turn 90 degrees the time that converts into outside second linearly polarized light, the overvoltage drive and keep the second linear polarization polarized state of light to remain unchanged in even frame; Perhaps, the dynamic compensation of even frame in the time period (t1) polarization direction of said first linearly polarized light is revolved turn 90 degrees that (t2) remains unchanged to the said first linear polarization polarized state of light in the time period that converts into outside second linearly polarized light, the dynamic compensation in even frame, in the overvoltage drive time of odd-numbered frame the polarization direction of said first linearly polarized light revolved and turn 90 degrees the time that converts into outside second linearly polarized light, the overvoltage drive and keep the second linear polarization polarized state of light to remain unchanged in odd-numbered frame.The second vertically aligned liquid crystal light valve 4 be used for dynamic compensation in odd-numbered frame in the time period (t1) polarization direction of second linearly polarized light of the said first vertically aligned liquid crystal light valve output returned to turn 90 degrees convert first linearly polarized light into; (t2) remains unchanged the first linear polarization polarized state of light of the first vertically aligned liquid crystal light valve output in time period outside the dynamic compensation of odd-numbered frame; The second linear polarization polarized state of light to the first vertically aligned liquid crystal light valve output when even frame remains unchanged; Perhaps, be used for dynamic compensation in even frame in the time period (t1) with the polarization direction of second linearly polarized light of the said first vertically aligned liquid crystal light valve output return turn 90 degrees (t2) in the time period that converts into outside first linearly polarized light, the dynamic compensation in even frame with the first linear polarization polarized state of light of the first vertically aligned liquid crystal light valve output remain unchanged, the second linear polarization polarized state of light to the first vertically aligned liquid crystal light valve output during in odd-numbered frame remains unchanged.
In the present embodiment; The 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 (being generally polyimide), liquid crystal layer 13, frame adhesive 14, liner particle 15; Wherein liquid crystal layer 13 thickness are generally less than 5 microns, and the optical delay amount of liquid crystal layer is generally greater than 250nm.The tilt angle of oriented layer 12 can be arranged liquid crystal molecule between 85 degree and 90 degree with the direction perpendicular to glass baseplate surface; The used liquid crystal of VA type liquid crystal light valve has the negativity dielectric anisotropy; Two VA type liquid crystal light valves adopt same design, have the 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 sneak into a certain proportion of polymkeric substance, after the UV photopolymerization, form polymer network in liquid crystal material inside; Can effectively improve VA type response speed of liquid crystal, be referred to as the vertically aligned liquid crystal of polymer stabilizing type.
Polarization state converter 5 is positioned at the bright dipping side of the said second vertically aligned liquid crystal light valve 4, is used for converting first linearly polarized light and second linearly polarized light of second vertically aligned liquid crystal light valve 4 outputs into left circularly polarized light and right-circularly polarized light respectively.
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 the long axis of liquid crystal molecule projecting direction in the second vertically aligned liquid crystal light valve 4 is vertical each other with long axis of liquid crystal molecule projecting direction in the first vertically aligned liquid crystal light valve 3, and wherein the long axis of liquid crystal molecule direction is by the frictional direction decision of oriented layer 12.Above-mentioned polarization converter 5 can adopt one-quarter wavelength retardation film to realize; Long axis of liquid crystal molecule projecting direction in its optical axis direction and the said first vertically aligned liquid crystal light valve during activated state is parallel; The retardation scope is between 120nm～150nm, and representative value is 125nm and 138nm.Fig. 3 A, Fig. 3 B are the contrasts of four optical axis relative angles; The polarization direction of linear polarization side's device 2 is that the long axis of liquid crystal molecule projecting direction of 16, the first vertically aligned liquid crystal light valves 3 is that long axis of liquid crystal molecule projecting direction in 17, the second vertically aligned liquid crystal light valves 4 is 18 among Fig. 3 A; The optical axis direction of one-quarter wavelength retardation film 5 is 19; Direction 16 and direction 17 angles 45 degree, direction 17 is vertical with direction 18, and direction 17 is parallel with direction 19.The polarization direction of linear polarization side's device 2 is 16 among Fig. 3 B; 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 the 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 angles, direction 20 is vertical with direction 21, and direction 20 is parallel with direction 22.
As indicated above; Projector 1 is used for alternately playing the projector of left-eye image and eye image; When concrete work,, need carry out corresponding driving to first vertically aligned liquid crystal light valve 3, the second vertically aligned liquid crystal light valve 4 for cooperating the concrete image of playing of projector.Therefore above-mentioned stereo projection system also comprises a synchronizing circuit 8; Be used for extracting the frame rate synchronizing signal of right and left eyes image, and drive the first vertically aligned liquid crystal light valve 3 and the second vertically aligned liquid crystal light valve 4 with the dynamic compensation mode according to extracting result's generation from projector 1.Drive waveforms is respectively shown in Fig. 4 A and Fig. 4 B.
The vertically aligned liquid crystal light valve of the vertically aligned liquid crystal light valve of above-mentioned linear polarizer 2, first 3, second 4, polarization state converter 5, synchronizing circuit 8 can be placed on outside the projector 1, as the peripheral components of projector, also can be built among the projector 1.
Hereinafter combination Fig. 1 and Fig. 4 A, Fig. 4 B are described in detail the principle of work of above-mentioned optical projection system.At first; Before linear polarizer 2 is located at projector's 1 camera lens; The first vertically aligned liquid crystal light valve 3 is positioned at the outside (projector's 1 camera lens, one side is defined as the inboard) of linear polarizer 2; The 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 the right and left eyes picture signal, and alternate transmission is given projector 1 successively, projector 1 according to the time sequential mode play left eye picture and right eye picture successively, promptly the right and left eyes picture is distinguished corresponding odd-numbered frame picture and even frame picture; Light rays that projector 1 sends through the vertically aligned liquid crystal light valve of the vertically aligned liquid crystal light valve of linear polarizer 2, first 3, second 4, wavelength phase shift films 5 after; Project on the projection screen 6; Light is through the reflection of projection screen 6, and light still keeps circularly polarized state, and viewers wear rotatory polarization glasses 7 can be seen left-eye image and eye image respectively; The realization left-eye image is separated with eye image, thereby realizes that 3D shows.
It is T that projector plays a frame picture required time, and left eye picture and right eye picture come loop play in order successively, respectively corresponding odd-numbered frame and even frame; The light valve system of being 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 light of odd-numbered frame and even frame.
To the liquid crystal light valve in the above-mentioned stereo projection system, can adopt following method to drive:
Steps A, synchronizing circuit are used to produce some drive voltage signal, and extract the frame rate synchronizing signal of right and left eyes image from projector in real time;
Step B; Synchronizing circuit drives the first vertically aligned liquid crystal light valve according to extracting the result; So that in the time period outside the dynamic compensation of the dynamic compensation of odd-numbered frame in the time period, odd-numbered frame, during even frame, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, 1/2nd wavelength; Perhaps in the time period outside the dynamic compensation of the dynamic compensation of even frame in the time period, even frame, during odd-numbered frame, the retardation of the liquid crystal molecule of the first vertically aligned liquid crystal light valve is respectively 1/2nd wavelength, zero, 1/2nd wavelength;
Step C; Synchronizing circuit is in execution in step B; Also the second vertically aligned liquid crystal light valve is driven; So that in the time period outside the dynamic compensation of the dynamic compensation of odd-numbered frame in the time period, odd-numbered frame, during 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; Perhaps in the time period outside the dynamic compensation of the dynamic compensation of even frame in the time period, even frame, during odd-numbered frame, 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, the corresponding eye image of even frame during concrete the realization, 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, inferior positive high voltage V1, no-voltage 0, inferior negative high voltage-V1, negative high voltage-V2; Wherein the t1 time is the dynamic compensation time; The first vertically aligned liquid crystal light valve 3 maintenance+V1 voltages at this moment, the second vertically aligned liquid crystal light valve 4 is driven into and first vertically aligned liquid crystal light valve 3 equal state, all voltage of maintenance+V1 from original 0V; After the t1 time finished, the voltage of two light valves was reduced to 0V simultaneously, and this moment, the first vertically aligned liquid crystal light valve 3 was consistent with the liquid crystal molecule dynamic response in the second vertically aligned liquid crystal light valve 4, and its optical states compensates each other; Light through the second vertically aligned liquid crystal light valve 4 is linearly polarized photon, and the polarization direction is consistent with the polarization direction of linear polarizer 2; At t2 in the time period, the plumbness the when liquid crystal molecule in two light valves returns to 0V voltage; Light through the second vertically aligned liquid crystal light valve 4 still is linearly polarized photon, and the polarization direction of polarization direction and linear polarizer 2 still is consistent; The t3 time is the overvoltage drive time of the first vertically aligned liquid crystal light valve 3; At t3 in the time period; It is high voltage+V2 that the first vertically aligned liquid crystal light valve 3 is attend institute's making alive, is used 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 treating the first vertically aligned liquid crystal light valve 3 reached 1/2 wavelength, the t3 time finished; The voltage of the first vertically aligned liquid crystal light valve 3 switches to+V1 at once, enters into t4 in the time period, and it is 1/2 wavelength that voltage+V1 is used to keep the retardation of the first vertically aligned liquid crystal light valve 3; The second vertically aligned liquid crystal light valve 4 all keeps 0V at t3 and t4 in the time; Therefore the light through the first vertically aligned liquid crystal light valve 3 still is linearly polarized photon, and the polarization direction has been rotated 90 degree by the first vertically aligned liquid crystal light valve 3, and the polarization direction is vertical with the polarization direction of linear polarizer 2.Liquid crystal molecule is a plumbness in the second vertically aligned liquid crystal light valve 4; No retardation; Do not change the polarization state of transmitted light, therefore the light through the second vertically aligned liquid crystal light valve 4 still is linearly polarized photon, and the polarization direction is vertical with the polarization direction of linear polarizer 2.T1 and t2 sum equal T, and t3 and t4 sum also equal T, and time T is projector and shows the required time of a frame picture; So far, a drive cycle finishes, and each drive cycle comprises two frames, and the cycle is 2T.List voltage corresponding in each time period and the corresponding relation between retardation and the outgoing polarized state of light in the table 1.
One-period is changed the positive negative level of drive waveforms after finishing each other, is used to avoid liquid crystal cell inside to assemble multi-charge, realizes AC driving.
Light from second vertically aligned liquid crystal light valve 4 ejaculations; Be converted into circularly polarized light through after the one-quarter wavelength retardation film 5; Because it is vertical each other in the polarization direction of different frame emergent light in the time; And become 45 degree or negative 45 degree angles with the optical axis direction of one-quarter wavelength retardation film 5, thereby make different frame form left circularly polarized light and right-circularly polarized light in the time respectively; After metal screen 6 reflections, light still keeps circularly polarized state; Viewers wear rotatory polarization glasses 7 can be seen left-eye image and eye image respectively, and the realization left-eye image is separated with eye image, thereby realize that 3D shows.
The utility model is owing to adopted 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; Has very high response speed; Make optical response time be reduced to 100 delicate below, thereby make whole stereo projection apparatus can support higher frame rate, can obviously improve the conditions of streaking of high-speed motion picture.And than the stereo projection system of dual-projection machine, the utility model is simple in structure, and circuit is simple, and cost is low, need not to consider two projectors projected image contraposition problem.Compare with the two light valve stereo projection apparatus of optics self compensation flexure type, have higher response speed, higher contrast, better stereo display effect.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (8)
1. the stereo projection system of single projector formula is characterized in that, said stereo projection system comprises along optical path direction successively:
Be used for alternately playing left-eye image and eye image, support that frame rate is the projector of the video playback of 100HZ or higher frame rate; Said projector is digital micro-mirror formula projector, liquid crystal over silicon formula projector, liquid crystal display formula projector or laser projection formula projector;
Be used for the projection ray of said projector is converted into the linear polarizer of first linearly polarized light;
The first vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be converted into from first linearly polarized light that linear polarizer sees through and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps first linearly polarized light not produced any effect;
The second vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be first linearly polarized light at dynamic compensation through second linearly polarized light revolution of the first vertically aligned liquid crystal light valve in time period, the polarized light through itself not produced any effect at dynamic compensation in the time period outside the time;
Polarization state converter, the bright dipping side that it is positioned at the said second vertically aligned liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of the said second vertically aligned liquid crystal light valve output into left circularly polarized light and right-circularly polarized light respectively;
Projection screen is used for the projection ray's catoptric imaging to said polarization state converter output, and reflected light keeps from the circular polarization polarized state of light of said polarization state converter output;
Be used to separate the rotatory polarization glasses of the right and left eyes image of said projection screen reflection;
Said stereo projection system also comprises a synchronizing circuit, is used for extracting from said projector the frame rate synchronizing signal of right and left eyes image, and drives the first vertically aligned liquid crystal light valve and the second vertically aligned liquid crystal light valve according to extracting the result.
2. the stereo projection system of single projector as claimed in claim 1 formula is characterized in that: the said first vertically aligned liquid crystal light valve be used for dynamic compensation in odd-numbered frame in the time period t1 polarization direction of said first linearly polarized light is revolved turn 90 degrees that t2 remains unchanged to the said first linear polarization polarized state of light in the time period that converts into outside second linearly polarized light, the dynamic compensation in odd-numbered frame, in the overvoltage drive time of even frame the polarization direction of said first linearly polarized light revolved and turn 90 degrees the time that converts into outside second linearly polarized light, the overvoltage drive and keep the second linear polarization polarized state of light to remain unchanged in even frame; Perhaps, the dynamic compensation of even frame in the time period t1 polarization direction of said first linearly polarized light is revolved turn 90 degrees that t2 remains unchanged to the said first linear polarization polarized state of light in the time period that converts into outside second linearly polarized light, the dynamic compensation in even frame, in the overvoltage drive time of odd-numbered frame the polarization direction of said first linearly polarized light revolved and turn 90 degrees the time that converts into outside second linearly polarized light, the overvoltage drive and keep the second linear polarization polarized state of light to remain unchanged in odd-numbered frame;
The said second vertically aligned liquid crystal light valve be used for dynamic compensation in odd-numbered frame in the time period t1 polarization direction of second linearly polarized light of the said first vertically aligned liquid crystal light valve output returned to turn 90 degrees convert first linearly polarized light into; T2 remains unchanged the first linear polarization polarized state of light of the first vertically aligned liquid crystal light valve output in time period outside the dynamic compensation of odd-numbered frame; The second linear polarization polarized state of light to the first vertically aligned liquid crystal light valve output when even frame remains unchanged; Perhaps, be used for dynamic compensation in even frame in the time period t1 with the polarization direction of second linearly polarized light of the said first vertically aligned liquid crystal light valve output return turn 90 degrees t2 in the time period that converts into outside first linearly polarized light, the dynamic compensation in even frame with the first linear polarization polarized state of light of the first vertically aligned liquid crystal light valve output remain unchanged, the second linear polarization polarized state of light to the first vertically aligned liquid crystal light valve output during in odd-numbered frame remains unchanged.
3. the stereo projection system of single projector as claimed in claim 1 formula; It is characterized in that said 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 the said projector or are placed on outside the said projector.
4. the stereo projection system of single projector as claimed in claim 1 formula; It is characterized in that said linear polarizer is absorption-type linear polarization device, metal wire grating type linear polarization device, polarization splitting prism type, polarization beam splitter molded lines polarizer or glass heap molded lines polarizer; Said absorption-type linear polarization device is that degree of polarization is higher than 99% dye-type or iodine-type polarizer.
5. the stereo projection system of single projector as claimed in claim 1 formula is characterized in that the thickness of liquid crystal layer of the said first vertically aligned liquid crystal light valve and/or the second vertically aligned liquid crystal light valve is less than 5 microns, and the optical delay amount is generally greater than 250nm.
6. 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 during activated state in the said first vertically aligned liquid crystal light valve becomes 45 degree or negative 45 degree with the polarization direction of said linear polarizer; Long axis of liquid crystal molecule projecting direction in the said second vertically aligned liquid crystal light valve is vertical each other with long axis of liquid crystal molecule projecting direction in the said first vertically aligned liquid crystal light valve.
7. the stereo projection system of single projector as claimed in claim 1 formula; It is characterized in that; Said polarization state converter is an one-quarter wavelength retardation film; Long axis of liquid crystal molecule projecting direction in its optical axis direction and the said first vertically aligned liquid crystal light valve during activated state is parallel, and the retardation scope is between 120nm～150nm.
8. a projector is characterized in that, comprising:
Be used for the projection ray of said projector is converted into the linear polarizer of first linearly polarized light;
The first vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be converted into from first linearly polarized light that linear polarizer sees through and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps first linearly polarized light not produced any effect;
The second vertically aligned liquid crystal light valve; Be used for the output light that odd-numbered frame is inferior and even frame is inferior through the said linear polarizer of synchronous modulation; To be first linearly polarized light at dynamic compensation through second linearly polarized light revolution of the first vertically aligned liquid crystal light valve in time period, the polarized light through itself not produced any effect at dynamic compensation in the time period outside the time;
Polarization state converter, the bright dipping side that it is positioned at the said second vertically aligned liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of the said second vertically aligned liquid crystal light valve output into left circularly polarized light and right-circularly polarized light respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200073206U CN202631945U (en) | 2012-01-06 | 2012-01-06 | Single projector type stereo projection system and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200073206U CN202631945U (en) | 2012-01-06 | 2012-01-06 | Single projector type stereo projection system and projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202631945U true CN202631945U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200073206U Withdrawn - After Issue CN202631945U (en) | 2012-01-06 | 2012-01-06 | Single projector type stereo projection system and projector |
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| Country | Link |
|---|---|
| CN (1) | CN202631945U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540696A (en) * | 2012-01-06 | 2012-07-04 | 深圳秋田微电子有限公司 | Single projector type stereoscopic projection system, projector and driving method |
| CN104349093A (en) * | 2013-08-01 | 2015-02-11 | 深圳市亿思达科技集团有限公司 | Single-machine dual-projection system and control method |
-
2012
- 2012-01-06 CN CN2012200073206U patent/CN202631945U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540696A (en) * | 2012-01-06 | 2012-07-04 | 深圳秋田微电子有限公司 | Single projector type stereoscopic projection system, projector and driving method |
| CN102540696B (en) * | 2012-01-06 | 2015-07-22 | 深圳秋田微电子有限公司 | Single projector type stereoscopic projection system, projector and driving method |
| CN104349093A (en) * | 2013-08-01 | 2015-02-11 | 深圳市亿思达科技集团有限公司 | Single-machine dual-projection system and control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121226 Effective date of abandoning: 20150722 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20121226 Effective date of abandoning: 20150722 |
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| RGAV | Abandon patent right to avoid regrant |