CN202631941U - Double-liquid crystal light-valve single projector type stereo projection system and projector - Google Patents
Double-liquid crystal light-valve single projector type stereo projection system and projector Download PDFInfo
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- CN202631941U CN202631941U CN2012200073070U CN201220007307U CN202631941U CN 202631941 U CN202631941 U CN 202631941U CN 2012200073070 U CN2012200073070 U CN 2012200073070U CN 201220007307 U CN201220007307 U CN 201220007307U CN 202631941 U CN202631941 U CN 202631941U
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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 double-liquid crystal light-valve single projector type stereo projection system comprises a projector, a linear polarizer, a first optical self compensation flexural mode liquid crystal light valve, a second optical self compensation flexural mode liquid crystal light valve, a polarization state converter, a projection screen, circular polarized glasses, and a synchronous circuit which are sequentially arranged along the optical path direction. The utility model employs double-optical self compensation flexural mode liquid crystal light valve type single projector stereo projection apparatus to cooperate with the dynamic compensation driving technology. The two optical self compensation flexural mode liquid crystal light valves can adjust the polarized state of light at high speed, thereby realizing the stereo projection of higher frame frequency with simple structure and low cost. The spectators can watch the stereo projection via circular polarized glasses by utilizing one projector cooperating with two liquid crystal light valves and one matched drive circuit.
Description
Technical field
The utility model belongs to the stereo projection technology field; Relate in particular to the formula stereo projection system and the projector of the brilliant light valve list of a kind of biliquid projector, utilize two optics self compensation flexure type liquid crystal light valves of projector's collocation and rotatory polarization glasses to realize stereoprojection.
Background technology
In existing three-dimensional film technology; The general frequency of 144Hz that adopts is carried out the broadcast of three-dimensional film; This 144 frame comprises 72 frame left eye pictures and 72 frame right eye pictures, and in 72 corresponding frame pictures of every eye, reality only has 24 width of cloth pictures; Every width of cloth picture repeat play 3 times, thus constitute 72 frame pictures; When playing the picture of high-speed motion,, tend to cause fuzzy pictures and hangover with the broadcasting speed of every eyes of per second 24 width of cloth pictures, make image quality obviously descend because number of pictures is not enough.In order to improve the fuzzy and hangover of high-speed motion picture, to having gone out the play-back technology of 48 frames or higher frame rate, corresponding movie server also upgrades to 48 frames or higher frame rate respectively in digital movie machine manufacturer.Yet existing use liquid crystal light valve carries out light in the 3D equipment of polarization adjustment, and its liquid crystal light valve response time when frequency improves, often because response speed is fast inadequately, can be caused degradation problem under the 3D effect in the millisecond rank.
The utility model content
The utility model first technical matters to be solved is to provide the stereo projection system of the brilliant light valve list of a kind of biliquid projector formula, is intended to improve the response speed of the liquid crystal light valve in the stereo projection system, improves the stereoprojection effect.
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 the brilliant light valve list of the biliquid projector formula that solves first technical matters and provide 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 optics self compensation flexure type 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 optics self compensation flexure type 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 transform into through first linearly polarized light of the first optics self compensation flexure type liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, will be first linearly polarized light through second linearly polarized light revolution of the first optics self compensation flexure type liquid crystal light valve perhaps;
Polarization state converter; The bright dipping side that it is positioned at the said second optics self compensation flexure type liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second optics self compensation flexure type 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; Be used for extracting the frame rate synchronizing signal of right and left eyes image, and drive the first optics self compensation flexure type liquid crystal light valve and the second optics self compensation flexure type liquid crystal light valve with the dynamic compensation mode according to extracting the result from said projector.
Further, the said first optics self compensation flexure type liquid crystal light valve is used for dynamic compensation in odd-numbered frame t1 remains unchanged to the said first linear polarization polarized state of light in the time period, t2 revolves the polarization direction of said first linearly polarized light to turn 90 degrees and converts second linearly polarized light into, the said first linear polarization polarized state of light is remained unchanged during in even frame in the time period outside the dynamic compensation in odd-numbered frame; Perhaps, t1 remains unchanged to the said first linear polarization polarized state of light in the time period, t2 revolves the polarization direction of said first linearly polarized light to turn 90 degrees and converts second linearly polarized light into, the said first linear polarization polarized state of light is remained unchanged during in odd-numbered frame in the time period outside the dynamic compensation in even frame to be used for dynamic compensation in even frame;
The said second optics self compensation flexure type liquid crystal light valve is used for remaining unchanged at the dynamic compensation first linear polarization polarized state of light that t1 exports the said first optics self compensation flexure type liquid crystal light valve in the time period of odd-numbered frame; T2 returns the polarization direction of said second linearly polarized light to turn 90 degrees and converts first linearly polarized light in time period outside the dynamic compensation of odd-numbered frame; The polarization direction of first linearly polarized light of when even frame, the said first optics self compensation flexure type liquid crystal light valve being exported is revolved to turn 90 degrees and is converted second linearly polarized light into; Perhaps, be used for dynamic compensation in even frame in the time period to the first linear polarization polarized state of light of said first optics self compensation flexure type liquid crystal light valve output remain unchanged, t2 will the polarization direction of said second linearly polarized light goes back to the polarization direction that turn 90 degrees first linearly polarized light that converts first linearly polarized light into, the said first optics self compensation flexure type liquid crystal light valve is exported during in odd-numbered frame and revolves to turn 90 degrees and convert second linearly polarized light in time period outside the dynamic compensation in even frame.
Further, said linear polarizer, the first optics self compensation flexure type liquid crystal light valve, the second optics self compensation flexure type liquid crystal light valve, polarization state converter, synchronizing circuit is built in the said projector or be 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 optics self compensation flexure type liquid crystal light valve and/or the second optics self compensation flexure type liquid crystal light valve between 2 microns to 7 microns, not during making alive the optical delay amount of liquid crystal layer more than 500nm; Under the bending status voltage of minimum, the optical delay amount of liquid crystal layer correspondence is more than or equal to 1/2 wavelength.
Further, the long axis of liquid crystal molecule projecting direction in the said first optics self compensation flexure type 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 optics self compensation flexure type liquid crystal light valve is vertical each other with long axis of liquid crystal molecule projecting direction in the said first optics self compensation flexure type liquid crystal light valve.
Further, said polarization state converter is an one-quarter wavelength retardation film, and its optical axis direction is parallel with the long axis of liquid crystal molecule projecting direction in the said first optics self compensation flexure type liquid crystal light valve, 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 optics self compensation flexure type 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 optics self compensation flexure type 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 transform into through first linearly polarized light of the first optics self compensation flexure type liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, will be first linearly polarized light through second linearly polarized light revolution of the first optics self compensation flexure type liquid crystal light valve perhaps; Polarization state converter; The bright dipping side that it is positioned at the said second optics self compensation flexure type liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second optics self compensation flexure type liquid crystal light valve output into left circularly polarized light and right-circularly polarized light respectively.
Two OCB of the employing that the utility model provides (Optical self-Compensated Bend Mode; Optics self compensation beam mode) single projector stereo projection apparatus of type liquid crystal light valve; Cooperate the dynamic compensation actuation techniques; Two optics self compensation flexure type liquid crystal light valves can be adjusted polarized state of light at a high speed, have realized the stereoprojection of higher frame rate.Than the stereo projection apparatus of other liquid crystal light valve types, the utlity model has higher response speed, can support the three-dimensional film of higher frequency to play, can obviously improve the hangover and the fuzzy problem of three-dimensional film high-speed motion picture; And simple in structure, with low cost, utilize projector's two liquid crystal light valves of collocation and supporting driving circuit, spectators can watch stereoprojection through wearing the rotatory polarization glasses.
Description of drawings
Fig. 1 is the optical structure chart of the stereo projection system of the brilliant light valve list of the biliquid that provides of the utility model embodiment projector formula;
Fig. 2 is the first optics self compensation flexure type liquid crystal light valve that provides of the utility model embodiment and the structural drawing of the second optics self compensation flexure type 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 optics self compensation flexure type liquid crystal light valve, the second optics self compensation flexure type liquid crystal light valve, polarization state converter;
Fig. 4 A, Fig. 4 B are respectively the drive waveforms synoptic diagram to the first optics self compensation flexure type liquid crystal light valve and the second optics self compensation flexure type 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,, cooperate the dynamic compensation actuation techniques, realize the project stereoscopic image of separate unit projector, high frame rate through two liquid crystal light valves of projector's collocation and support circuit.
Fig. 1 shows the optical texture of the stereo projection system of the brilliant light valve list of the biliquid 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 the brilliant light valve list of biliquid that the utility model embodiment provides projector formula comprises along optical path direction successively: projector 1, linear polarizer 2, the first optics self compensation flexure type liquid crystal light valve 3, the second optics self compensation flexure type liquid crystal light valve 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.
First optics self compensation flexure type liquid crystal light valve of arranging in order 3 and the second optics self compensation flexure type 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 optics self compensation flexure type 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 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 optics self compensation flexure type liquid crystal light valve 4 cooperates the first optics self compensation flexure type liquid crystal light valve 3; Carry out the optics dynamic compensation; Improve the optic response speed of overall optical valve system with this; The output light that odd-numbered frame is inferior and even frame is inferior through synchronous modulation linear polarizer 2; To transform into through first linearly polarized light of the first optics self compensation flexure type liquid crystal light valve 3 and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, will be first linearly polarized light through second linearly polarized light revolution of the first optics self compensation flexure type liquid crystal light valve 3 perhaps.
Particularly, the first optics self compensation flexure type liquid crystal light valve 3 be used for dynamic compensation in odd-numbered frame in the time period (t1) the said first linear polarization polarized state of light is remained unchanged, in the time period outside the dynamic compensation in odd-numbered frame (t2) polarization direction of said first linearly polarized light is revolved to turn 90 degrees converts second linearly polarized light into, the said first linear polarization polarized state of light is remained unchanged during in even frame; Perhaps, be used for dynamic compensation in even frame in the time period (t1) the said first linear polarization polarized state of light is remained unchanged, in the time period outside the dynamic compensation in even frame (t2) polarization direction of said first linearly polarized light is revolved to turn 90 degrees converts second linearly polarized light into, the said first linear polarization polarized state of light is remained unchanged during in odd-numbered frame.The second optics self compensation flexure type liquid crystal light valve 4 is used for the first linear polarization polarized state of light of the first optics self compensation flexure type liquid crystal light valve, 3 outputs being remained unchanged in the time period at the dynamic compensation of odd-numbered frame; (t2) returns the polarization direction of said second linearly polarized light to turn 90 degrees and converts first linearly polarized light in time period outside the dynamic compensation of odd-numbered frame; The polarization direction of first linearly polarized light of when even frame, the first optics self compensation flexure type liquid crystal light valve 3 being exported is revolved to turn 90 degrees and is converted second linearly polarized light into; Perhaps, be used for dynamic compensation in even frame in the time period to the first linear polarization polarized state of light of the first optics self compensation flexure type liquid crystal light valve, 3 outputs remain unchanged, in time period outside the dynamic compensation in even frame (t2) will the polarization direction of said second linearly polarized light go back to the polarization direction that turn 90 degrees first linearly polarized light that converts first linearly polarized light into, the said first optics self compensation flexure type liquid crystal light valve 3 is exported during in odd-numbered frame and revolve to turn 90 degrees and convert second linearly polarized light into.
In the present embodiment; The first optics self compensation flexure type liquid crystal light valve 3 and the second optics self compensation flexure type 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 between 2 microns to 7 microns, not during making alive the optical delay amount of liquid crystal layer 13 more than 500nm; When the bending status of optics self compensation flexure type liquid crystal light valve, retardation corresponding under its minimum voltage is more than or equal to 1/2 wavelength, promptly more than or equal to 240nm; The tilt angle of oriented layer 12 is between 1 degree and 10 degree; The used liquid crystal of OCB type liquid crystal light valve has the positivity dielectric anisotropy; The first optics self compensation flexure type liquid crystal light valve 3 and the second optics self compensation flexure type liquid crystal light valve 4 adopt same design, have the same delay amount and adopt the liquid crystal material of identical type.
Long axis of liquid crystal molecule projecting direction in the above-mentioned first optics self compensation flexure type 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 optics self compensation flexure type liquid crystal light valve 4 is vertical each other with long axis of liquid crystal molecule projecting direction in the first optics self compensation flexure type liquid crystal light valve 3; 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; Its optical axis direction is parallel with the long axis of liquid crystal molecule projecting direction in the said first optics self compensation flexure type liquid crystal light valve; 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 optics self compensation flexure type liquid crystal light valves 3 is that long axis of liquid crystal molecule projecting direction in 17, the second optics self compensation flexure type 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 optics self compensation flexure type liquid crystal light valve 3 is 20; Long axis of liquid crystal molecule projecting direction in the second optics self compensation flexure type 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.
Projection screen 6 is used for the circularly polarized light projection ray of polarization state converter 5 outputs is carried out catoptric imaging; With left and right sides image reflection to rotatory polarization glasses 7; Reflected light has kept from the circular polarization polarized state of light of polarization state converter 5 outputs, and rotatory polarization glasses 7 are again with the right and left eyes separation of images.Above-mentioned projection screen 6 must be the metal screen, and general gain coefficient is more than 1.5, and common scope is between 1.8～2.5, after the reflection of incident polarization light through the metal screen, can keep the incident polarization polarization state of light, does not have the polarization phenomena of moving back basically and takes place.The right and left eyes of rotatory polarization glasses 7 is corresponding left-handed rotatory polarization sheet and dextrorotation rotatory polarization sheet respectively; Specifically can be the corresponding left-handed rotatory polarization sheet of left eye, the corresponding dextrorotation rotatory polarization of right eye sheet, perhaps the corresponding dextrorotation rotatory polarization of left eye sheet, the corresponding left-handed rotatory polarization sheet of right eye conversely.
As indicated above; Projector 1 is used for alternately playing the projector of left-eye image and eye image; When concrete work, be to cooperate the concrete image of playing of projector, need carry out corresponding driving to the first optics self compensation flexure type liquid crystal light valve 3, the second optics self compensation flexure type liquid crystal light valve 4.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 optics self compensation flexure type liquid crystal light valve 3 and the second optics self compensation flexure type liquid crystal light valve 4 with the dynamic compensation mode according to extracting the result from projector 1.Drive waveforms is respectively shown in Fig. 4 A and Fig. 4 B.
Above-mentioned linear polarizer 2, the first optics self compensation flexure type liquid crystal light valve 3, the second optics self compensation flexure type liquid crystal light valve 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 optics self compensation flexure type 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 optics self compensation flexure type liquid crystal light valve 4 is positioned at the outside of the first optics self compensation flexure type liquid crystal light valve 3, and the outside of the second optics self compensation flexure type 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 linear polarizer 2, the first optics self compensation flexure type liquid crystal light valve 3, the second optics self compensation flexure type liquid crystal light valve 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 OCB 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.
Can adopt following method to drive to the liquid crystal light valve in the above-mentioned stereo projection system:
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 optics self compensation flexure type 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 liquid crystal molecule of the first optics self compensation flexure type liquid crystal light valve is in consistent attitude, bending status, consistent attitude respectively, and retardation is respectively zero, 1/2nd wavelength, 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; Make the liquid crystal molecule of the first optics self compensation flexure type liquid crystal light valve be in consistent attitude, bending status, consistent attitude respectively, retardation is respectively zero, 1/2nd wavelength, zero;
Step C; Synchronizing circuit is in execution in step B; Also the second optics self compensation flexure type 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 liquid crystal molecule of the second optics self compensation flexure type liquid crystal light valve is in consistent attitude, bending status, bending status respectively, retardation is respectively zero, 1/2nd wavelength, 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; Make the liquid crystal molecule of the second optics self compensation flexure type liquid crystal light valve be in consistent attitude, bending status, bending status respectively, retardation is respectively zero, 1/2nd wavelength, 1/2nd wavelength.
Hereinafter is the principle of work that example is explained the utility model with the corresponding left-eye image of odd-numbered frame, the corresponding eye image of even frame, and should be appreciated that also can the corresponding eye image of odd-numbered frame, the corresponding left-eye image of even frame.
Common first odd-numbered frame picture cycle T that forms of t1 and t2 time also is the playback period of left eye picture among Fig. 4 A, the 4B; The t1 time is the dynamic compensation time, and t2 is the time outside the dynamic compensation, and 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.
At the t1 first optics self compensation flexure type liquid crystal light valve, 3 maintenance+V1 voltages in the time period; The second optics self compensation flexure type liquid crystal light valve 4 also keeps V2 voltage; The retardation of the first optics self compensation flexure type liquid crystal light valve 3 and the second optics self compensation flexure type liquid crystal light valve 4 all approaches zero; Therefore any effect does not take place in the polarized light to process, and the light that sees through the second optics self compensation flexure type liquid crystal light valve 4 still is linearly polarized photon, and the polarization direction is consistent with the polarization direction 16 of linear polarizer 2; T1 is in the time, and two interior long axis of liquid crystal molecule of liquid crystal light valve are basically perpendicular to glass baseplate surface, are called consistent attitude; After the t1 time finishes, enter into t2 in the time period, the voltage of two light valves is reduced to V1 voltage at once simultaneously; This moment, the first optics self compensation flexure type liquid crystal light valve 3 changed bending status with the second optics self compensation flexure type liquid crystal light valve, 4 interior liquid crystal molecules into by consistent attitude; Because the first optics self compensation flexure type liquid crystal light valve 3 adopts identical design with the second optics self compensation flexure type liquid crystal light valve 4; Its dynamic response is consistent; Its optical states compensates each other; Therefore the light through the second optics self compensation flexure type liquid crystal light valve 4 still is linearly polarized photon, and the polarization direction is consistent with the polarization direction 16 of linear polarizer 2; At t2 in the time period; After liquid crystal molecule dynamic response in two light valves finishes; Liquid crystal molecule keeps stable bending status; It is 1/2 wavelength that V1 voltage is used to keep effective retardation of the first optics self compensation flexure type liquid crystal light valve 3 and the second optics self compensation flexure type liquid crystal light valve 4, and promptly between the 240nm to 300nm, representative value is 250nm and 270nm; The optical states that is in two light valves of bending status is still complementary, and therefore the light through the second optics self compensation flexure type liquid crystal light valve 4 still is linearly polarized photon, and the polarization direction 16 of polarization direction and linear polarizer 2 still is consistent; Through optimization to liquid crystal material and thickness of liquid crystal layer, can be so that the first optics self compensation flexure type liquid crystal light valve 3 foreshortens to 1.2 millisecond from consistent attitude to the time of bending status conversion with the second optics self compensation flexure type liquid crystal light valve 4; The dynamic compensation time, t1 generally was no more than 1 millisecond, was generally about 200 microsecond to 400 microseconds; Voltage V2 generally is higher than 10V, and higher voltage helps to improve the response time of liquid crystal; The liquid crystal layer retardation amount that is used to V2 voltage make approaches zero as far as possible; V1 voltage is used to keep the effective retardation of liquid crystal layer at 1/2 wavelength;
After the t2 time finishes, enter into t3 in the time period, projector gets into first even frame picture, also is the playback period of right eye picture; The t3 time equals the time T that projector plays a frame picture; In time period, it is high voltage+V2 that the first optics self compensation flexure type liquid crystal light valve 3 is attend institute's making alive at t3, is used for the retardation of the first optics self compensation flexure type liquid crystal light valve 3 is reduced to about 0; Light through the first optics self compensation flexure type liquid crystal light valve 3 does not change original polarization state; At t3 in the time; 4 making alives of the second optics self compensation flexure type liquid crystal light valve are V1; The second optics self compensation flexure type liquid crystal light valve, 4 liquid crystal layers keep the retardation of 1/2 wavelength; Therefore can turn 90 degrees revolving through the polarization direction of the light of the second optics self compensation flexure type liquid crystal light valve 4, perpendicular with the polarization direction 16 of the linearly polarized light that enters into the first optics self compensation flexure type liquid crystal light valve 3; Improving V2 voltage can foreshorten to the first optics self compensation flexure type liquid crystal light valve 3 below 100 microseconds to the time that consistent attitude transforms from bending status with the second optics self compensation flexure type liquid crystal light valve 4;
Every frame picture playback period T depends on the broadcast frequency of projector; Representative value according to above each time period calculates: dynamic compensation time t1 is that 300 microseconds, consistent attitude are 1.2 milliseconds to the time of bending status conversion; Bending status is 100 microseconds to the time of consistent attitude conversion; Therefore the whole process shortest time is 1.6 milliseconds, can support the frame rate of the highest 625Hz;
So far; Projector plays a width of cloth left eye picture and a width of cloth right eye picture respectively; When projector begins to play the circulation time of next odd even picture, the drive waveforms of the first optics self compensation flexure type liquid crystal light valve 3 and the second optics self compensation flexure type liquid crystal light valve 4 is still carried out according to aforesaid way, but level can convert opposite levels into; With the mode of maintenance AC driving, thereby avoid the damage of DC driven to liquid crystal light valve.
Light through behind the second optics self compensation flexure type liquid crystal light valve 4 is linearly polarized photon, but vertical each other in the polarization side of different frame in the time, and becomes 45 degree or negative 45 degree angles with the optical axis direction of one-quarter wavelength retardation film 5; Through after the one-quarter wavelength retardation film 5, form opposite left circularly polarized light of sense of rotation and right-circularly polarized light respectively, thereby realize separating of odd-numbered frame and even frame picture.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.
Table 1 has been listed each corresponding constantly driving voltage, and the retardation under each voltage, provides the polarization state through the light behind the second optics self compensation flexure type liquid crystal light valve 4 simultaneously;
The utility model is owing to adopted the dynamic response compensation technique that optics self compensation flexure type liquid crystal light valve is carried out the compensation of response time; 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 below 100 microseconds; Thereby make whole stereo projection apparatus can support frame rate, cooperate the digital projector and the digital broadcast server of high frame frequency, can obviously improve the conditions of streaking of high-speed motion picture up to 600Hz.
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 the brilliant light valve list of biliquid 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 optics self compensation flexure type 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 optics self compensation flexure type 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 transform into through first linearly polarized light of the first optics self compensation flexure type liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, will be first linearly polarized light through second linearly polarized light revolution of the first optics self compensation flexure type liquid crystal light valve perhaps;
Polarization state converter; The bright dipping side that it is positioned at the said second optics self compensation flexure type liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second optics self compensation flexure type 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; Be used for extracting the frame rate synchronizing signal of right and left eyes image, and drive the first optics self compensation flexure type liquid crystal light valve and the second optics self compensation flexure type liquid crystal light valve with the dynamic compensation mode according to extracting the result from said projector.
2. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector formula is characterized in that: the said first optics self compensation flexure type liquid crystal light valve is used for dynamic compensation in odd-numbered frame, and t1 remains unchanged to the said first linear polarization polarized state of light in the time period, t2 revolves the polarization direction of said first linearly polarized light to turn 90 degrees and converts second linearly polarized light into, the said first linear polarization polarized state of light is remained unchanged during in even frame in the time period outside the dynamic compensation in odd-numbered frame; Perhaps, t1 remains unchanged to the said first linear polarization polarized state of light in the time period, t2 revolves the polarization direction of said first linearly polarized light to turn 90 degrees and converts second linearly polarized light into, the said first linear polarization polarized state of light is remained unchanged during in odd-numbered frame in the time period outside the dynamic compensation in even frame to be used for dynamic compensation in even frame;
The said second optics self compensation flexure type liquid crystal light valve is used for remaining unchanged at the dynamic compensation first linear polarization polarized state of light that t1 exports the said first optics self compensation flexure type liquid crystal light valve in the time period of odd-numbered frame; T2 returns the polarization direction of said second linearly polarized light to turn 90 degrees and converts first linearly polarized light in time period outside the dynamic compensation of odd-numbered frame; The polarization direction of first linearly polarized light of when even frame, the said first optics self compensation flexure type liquid crystal light valve being exported is revolved to turn 90 degrees and is converted second linearly polarized light into; Perhaps, be used for dynamic compensation in even frame in the time period to the first linear polarization polarized state of light of said first optics self compensation flexure type liquid crystal light valve output remain unchanged, t2 will the polarization direction of said second linearly polarized light goes back to the polarization direction that turn 90 degrees first linearly polarized light that converts first linearly polarized light into, the said first optics self compensation flexure type liquid crystal light valve is exported during in odd-numbered frame and revolves to turn 90 degrees and convert second linearly polarized light in time period outside the dynamic compensation in even frame.
3. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector formula; It is characterized in that said linear polarizer, the first optics self compensation flexure type liquid crystal light valve, the second optics self compensation flexure type liquid crystal light valve, polarization state converter, synchronizing circuit is built in the said projector or be placed on outside the said projector.
4. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector 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 the brilliant light valve list of biliquid as claimed in claim 1 projector formula; It is characterized in that; The thickness of liquid crystal layer of the said first optics self compensation flexure type liquid crystal light valve and/or the second optics self compensation flexure type liquid crystal light valve between 2 microns to 7 microns, not during making alive the optical delay amount of liquid crystal layer more than 500nm; Under the bending status voltage of minimum, the optical delay amount of liquid crystal layer correspondence is more than or equal to 1/2 wavelength.
6. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector formula; It is characterized in that the long axis of liquid crystal molecule projecting direction in the said first optics self compensation flexure type 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 optics self compensation flexure type liquid crystal light valve is vertical each other with long axis of liquid crystal molecule projecting direction in the said first optics self compensation flexure type liquid crystal light valve.
7. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector formula; It is characterized in that; Said 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 the said first optics self compensation flexure type liquid crystal light valve, 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 optics self compensation flexure type 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 optics self compensation flexure type 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 transform into through first linearly polarized light of the first optics self compensation flexure type liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, will be first linearly polarized light through second linearly polarized light revolution of the first optics self compensation flexure type liquid crystal light valve perhaps;
Polarization state converter; The bright dipping side that it is positioned at the said second optics self compensation flexure type liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second optics self compensation flexure type 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 |
|---|---|---|---|
| CN2012200073070U CN202631941U (en) | 2012-01-06 | 2012-01-06 | Double-liquid crystal light-valve single projector type stereo projection system and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200073070U CN202631941U (en) | 2012-01-06 | 2012-01-06 | Double-liquid crystal light-valve single projector type stereo projection system and projector |
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| Publication Number | Publication Date |
|---|---|
| CN202631941U true CN202631941U (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200073070U Expired - Lifetime CN202631941U (en) | 2012-01-06 | 2012-01-06 | Double-liquid crystal light-valve single projector type stereo projection system and projector |
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| Country | Link |
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| CN (1) | CN202631941U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566249A (en) * | 2012-01-06 | 2012-07-11 | 深圳秋田微电子有限公司 | Stereo projection system with single projector and dual liquid crystal light valves, projector and driving method |
| CN103984131A (en) * | 2014-02-18 | 2014-08-13 | 友达光电股份有限公司 | Switchable lens unit, manufacturing method thereof and switchable plane stereoscopic display |
-
2012
- 2012-01-06 CN CN2012200073070U patent/CN202631941U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566249A (en) * | 2012-01-06 | 2012-07-11 | 深圳秋田微电子有限公司 | Stereo projection system with single projector and dual liquid crystal light valves, projector and driving method |
| CN102566249B (en) * | 2012-01-06 | 2014-10-15 | 深圳秋田微电子有限公司 | Stereo projection system with single projector and dual liquid crystal light valves, projector and driving method |
| CN103984131A (en) * | 2014-02-18 | 2014-08-13 | 友达光电股份有限公司 | Switchable lens unit, manufacturing method thereof and switchable plane stereoscopic display |
| CN103984131B (en) * | 2014-02-18 | 2016-08-24 | 友达光电股份有限公司 | Switchable lens unit, manufacturing method thereof and switchable plane stereoscopic display |
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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. |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20121226 |