CN202631942U - 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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- CN202631942U CN202631942U CN201220007316XU CN201220007316U CN202631942U CN 202631942 U CN202631942 U CN 202631942U CN 201220007316X U CN201220007316X U CN 201220007316XU CN 201220007316 U CN201220007316 U CN 201220007316U CN 202631942 U CN202631942 U CN 202631942U
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Abstract
Provided is 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 electric control double-refraction type liquid crystal light valve, a second electric control double-refraction 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-liquid-crystal light-valve single-projector type stereo projection system of the utility model is formed by two electric-control double-refraction type liquid crystal light valves. Spectators can watch the stereo projection by wearing rotatory polarization glasses. Two ECB type liquid crystal light valves are employed to control the polarized state of light, thereby realizing the projection stereo image with one single projector. Compared to the stereo projection arrangement employing two projectors, the single-projector type stereo projection system of the utility model features simple structure, simple circuit, and low cost. In addition, it is unnecessary to consider the counterpoint problem of the projection images of two projectors. The single-projector type stereo projection system of the utility model features better stereoscopic display effect.
Description
Technical field
The utility model belongs to the stereo projection technology field, relates in particular to the formula stereo projection system and the projector of the brilliant light valve list of a kind of biliquid projector, utilizes two electrically controlled birefringence mode 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 circularly polarized light and right-circularly polarized light; Two projectors are projected in the screen simultaneously, can watch stereopsis behind the viewers wear rotatory polarization glasses.Two accurate contrapositions of projector of this kind mode needs, with the accuracy of assurance projected position, and the xenon lamp brightness and the rate of decay basically identical of two projectors of needs, using two projectors simultaneously, cost is higher.
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 through simple structure, less cost, need not accurate contraposition and can realize stereoprojection.
The utility model second technical matters to be solved is to provide a kind of projector, is intended to can realize stereoprojection with this projector separately.
The stereo projection system of the brilliant light valve list of above-mentioned biliquid projector formula 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 linearly polarized light;
The first electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; 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 electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; To transform into through first linearly polarized light of the first electrically controlled birefringence mode liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps will be and the first vertical linearly polarized light of the said second linearly polarized light polarization direction through second linearly polarized light revolution of the first electrically controlled birefringence mode liquid crystal light valve;
Polarization state converter; The bright dipping side that it is positioned at the said second electrically controlled birefringence mode liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second electrically controlled birefringence mode 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 produce the synchronized signal that is used to drive the first electrically controlled birefringence mode liquid crystal light valve and the second electrically controlled birefringence mode liquid crystal light valve according to extracting the result from said projector.
Further, the said first electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve is used for the first linear polarization polarized state of light of said first electrically controlled birefringence mode liquid crystal light valve output 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 said first electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve, the second electrically controlled birefringence mode liquid crystal light valve, polarization state converter 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 plane of light incidence of said linear polarizer is coated with antireflection film.
Further, the thickness of liquid crystal layer of the said first electrically controlled birefringence mode liquid crystal light valve and/or the second electrically controlled birefringence mode liquid crystal light valve is less than 5 microns, and the optical delay amount of liquid crystal layer is between 240nm～300nm.
Further, the long axis of liquid crystal molecule projecting direction in the said first electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve is vertical each other with long axis of liquid crystal molecule projecting direction in the said first electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve, and the retardation scope is between 120nm～150nm.
Further, said projection screen is the metal screen.
Above-mentioned projector comprises: the linear polarizer that is used for the projection ray of said projector is converted into linearly polarized light; The first electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; 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 electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; To transform into through first linearly polarized light of the first electrically controlled birefringence mode liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps will be and the first vertical linearly polarized light of the said second linearly polarized light polarization direction through second linearly polarized light revolution of the first electrically controlled birefringence mode liquid crystal light valve; Polarization state converter; The bright dipping side that it is positioned at the said second electrically controlled birefringence mode liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second electrically controlled birefringence mode liquid crystal light valve output into left circularly polarized light and right-circularly polarized light respectively.
The utility model provides two ECB of a kind of use (Electrically Controlled Birefringence; Electrically controlled birefringence mode) single projector stereo projection apparatus of type liquid crystal light valve composition, spectators can watch the stereoprojection effect through wearing the rotatory polarization glasses, control polarized state of light through two ECB type liquid crystal light valves; Realized separate unit projector project stereoscopic image; 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 projectors projected image contraposition problem.And ECB type liquid crystal light valve has very high response speed, and the stereo projection apparatus that makes the utility model provide has better stereo display effect.
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 electrically controlled birefringence mode liquid crystal light valve that provides of the utility model embodiment and the structural drawing of the second electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve, the second electrically controlled birefringence mode liquid crystal light valve, polarization state converter;
Fig. 4 A, Fig. 4 B are respectively the drive waveforms synoptic diagram to the first electrically controlled birefringence mode liquid crystal light valve and the second electrically controlled birefringence mode 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 separate unit projector project stereoscopic image 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 electrically controlled birefringence mode liquid crystal light valve 3, the second electrically controlled birefringence mode 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.
The first electrically controlled birefringence mode liquid crystal light valve of arranging in order 3 and the second electrically controlled birefringence mode liquid crystal light valve 4 are through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation with linear polarizer 2; The first electrically controlled birefringence mode liquid crystal light valve 3 is through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation with 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 electrically controlled birefringence mode liquid crystal light valve 4 is through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation with linear polarizer 2; To transform into through first linearly polarized light of the first electrically controlled birefringence mode liquid crystal light valve 3 and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps will be and the first vertical linearly polarized light of the said second linearly polarized light polarization direction through second linearly polarized light revolution of the first electrically controlled birefringence mode liquid crystal light valve 3.
Particularly, the first electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve 4 is used for the first linear polarization polarized state of light of the first electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve 3 and the second electrically controlled birefringence mode 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 13 is between 240nm～300nm, and representative value is 250nm and 275nm; The tilt angle of oriented layer 12 can be arranged liquid crystal molecule between 1 degree and 10 degree with the direction along glass baseplate surface; The used liquid crystal of ECB type liquid crystal light valve has the positivity dielectric anisotropy; The first electrically controlled birefringence mode liquid crystal light valve 3 and the second electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve 4 is vertical each other with long axis of liquid crystal molecule projecting direction in the first electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valves 3 is that long axis of liquid crystal molecule projecting direction in 17, the second electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve 3 is 20; Long axis of liquid crystal molecule projecting direction in the second electrically controlled birefringence mode 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.
Above-mentioned linear polarizer 2, the first electrically controlled birefringence mode liquid crystal light valve 3, the second electrically controlled birefringence mode liquid crystal light valve 4, polarization state converter 5 can be placed on outside the projector 1, as the peripheral components of projector, also can be built among the projector 1.
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 electrically controlled birefringence mode liquid crystal light valve 3, the second electrically controlled birefringence mode 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 produce the synchronized signal that is used to drive the first electrically controlled birefringence mode liquid crystal light valve 3 and the second electrically controlled birefringence mode liquid crystal light valve 4 according to extracting the result from projector 1.Drive waveforms is respectively shown in Fig. 4 A and Fig. 4 B.
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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve 4 is positioned at the outside of the first electrically controlled birefringence mode liquid crystal light valve 3, and the outside of the second electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve 3, the second electrically controlled birefringence mode 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 ECB 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;
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:
T1 and t2 time are positioned at first odd-numbered frame picture cycle among Fig. 4 A, Fig. 4 B, and summation equals frame period T, also are the playback period of left eye picture; The t1 time is the dynamic compensation time; At the t1 first electrically controlled birefringence mode liquid crystal light valve, 3 maintenance+V1 voltages in the time period; The second electrically controlled birefringence mode liquid crystal light valve 4 also keeps V1 voltage, and the retardation of the first electrically controlled birefringence mode liquid crystal light valve 3 and the second electrically controlled birefringence mode liquid crystal light valve 4 all approaches zero, and therefore any effect does not take place the polarized light to process; The light that sees through the second electrically controlled birefringence mode 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; After the t1 time finishes; Enter into t2 in the time period; The voltage of two light valves is reduced to 0V at once simultaneously, and this moment, the first electrically controlled birefringence mode liquid crystal light valve 3 was consistent with the liquid crystal molecule dynamic response in the second electrically controlled birefringence mode liquid crystal light valve 4, and its optical states compensates each other; Therefore the light through the second electrically controlled birefringence mode 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; Behind the state when liquid crystal molecule in two light valves returns to no-voltage; The optical states of two light valves is still mutual compensation; Therefore the light through the second electrically controlled birefringence mode 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.
The dynamic compensation time, t1 generally was no more than 1 millisecond, was generally about 500 microseconds; Voltage V1 generally is higher than 5V, and higher voltage helps to improve the response time of liquid crystal; The liquid crystal layer retardation amount that is used to V1 voltage make approaches zero as far as possible; Every frame picture playback period T depends on the broadcast frequency of projector, and the frequency 144Hz of the digital projector of using according to general 3D film calculates, and the cycle of every frame picture is 6.944 milliseconds.
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+V1 that the first electrically controlled birefringence mode liquid crystal light valve 3 is attend institute's making alive at t3, is used for the retardation of the first electrically controlled birefringence mode liquid crystal light valve 3 is reduced to about 0; Light through the first electrically controlled birefringence mode liquid crystal light valve 3 does not change original polarization state; At t3 in the time; 4 making alives of the second electrically controlled birefringence mode liquid crystal light valve are 0 volt; Retardation keeps 1/2 wavelength retardation of liquid crystal layer itself; Therefore can turn 90 degrees revolving through the polarization direction of the light of the second electrically controlled birefringence mode liquid crystal light valve 4, perpendicular with the polarization direction 16 of the linearly polarized light that enters into the first electrically controlled birefringence mode liquid crystal light valve 3.
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 electrically controlled birefringence mode liquid crystal light valve 3 and the second electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 projection 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 corresponding retardation under each voltage, provides the polarization state through the light behind the second electrically controlled birefringence mode liquid crystal light valve 4 simultaneously;
Owing to adopted the dynamic compensation technology of response speed; 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 higher frame rate, can obviously improve the conditions of streaking of high-speed motion picture.
Compare with 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 projector's projected image contraposition problems and the unbalanced problem of brightness decay.Utilize projector's two liquid crystal light valves of collocation and supporting driving circuit, viewers wear rotatory polarization glasses can be watched stereoprojection.Because ECB type liquid crystal light valve has very fast response speed, therefore can obviously improve the cross-talk of the right and left eyes image generation that brings because of response speed, for bringing better 3D, spectators experience.
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 (10)
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 linearly polarized light;
The first electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; 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 electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; To transform into through first linearly polarized light of the first electrically controlled birefringence mode liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps will be and the first vertical linearly polarized light of the said second linearly polarized light polarization direction through second linearly polarized light revolution of the first electrically controlled birefringence mode liquid crystal light valve;
Polarization state converter; The bright dipping side that it is positioned at the said second electrically controlled birefringence mode liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second electrically controlled birefringence mode 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 produce the synchronized signal that is used to drive the first electrically controlled birefringence mode liquid crystal light valve and the second electrically controlled birefringence mode liquid crystal light valve 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve is used for the first linear polarization polarized state of light of said first electrically controlled birefringence mode liquid crystal light valve output 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 said first electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve, the second electrically controlled birefringence mode liquid crystal light valve, polarization state converter are built in the said projector or are 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 4 projector formula is characterized in that the plane of light incidence of said linear polarizer is coated with antireflection film.
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 thickness of liquid crystal layer of the said first electrically controlled birefringence mode liquid crystal light valve and/or the second electrically controlled birefringence mode liquid crystal light valve is less than 5 microns, and the optical delay amount of liquid crystal layer is between 240nm～300nm.
7. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector formula is characterized in that, the long axis of liquid crystal molecule projecting direction in the said first electrically controlled birefringence mode 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 electrically controlled birefringence mode liquid crystal light valve is vertical each other with long axis of liquid crystal molecule projecting direction in the said first electrically controlled birefringence mode liquid crystal light valve.
8. 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 electrically controlled birefringence mode liquid crystal light valve, and the retardation scope is between 120nm～150nm.
9. the stereo projection system of the brilliant light valve list of biliquid as claimed in claim 1 projector formula is characterized in that said projection screen is the metal screen.
10. a projector is characterized in that, comprising:
Be used for the projection ray of said projector is converted into the linear polarizer of linearly polarized light;
The first electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; 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 electrically controlled birefringence mode liquid crystal light valve; Be used for through the odd-numbered frame inferior and even frame inferior output light of synchronous modulation said linear polarizer; To transform into through first linearly polarized light of the first electrically controlled birefringence mode liquid crystal light valve and the second vertical linearly polarized light of the said first linearly polarized light polarization direction, perhaps will be and the first vertical linearly polarized light of the said second linearly polarized light polarization direction through second linearly polarized light revolution of the first electrically controlled birefringence mode liquid crystal light valve;
Polarization state converter; The bright dipping side that it is positioned at the said second electrically controlled birefringence mode liquid crystal light valve is used for converting first linearly polarized light and second linearly polarized light of said second electrically controlled birefringence mode 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 |
|---|---|---|---|
| CN201220007316XU CN202631942U (en) | 2012-01-06 | 2012-01-06 | Double-liquid-crystal light-valve single-projector type stereo projection system and projector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220007316XU CN202631942U (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 |
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| CN202631942U true CN202631942U (en) | 2012-12-26 |
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| CN201220007316XU Expired - Lifetime CN202631942U (en) | 2012-01-06 | 2012-01-06 | Double-liquid-crystal light-valve single-projector type stereo projection system and projector |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103976820A (en) * | 2014-04-30 | 2014-08-13 | 信利半导体有限公司 | Electric welding mask and driving circuit thereof |
| CN107976820A (en) * | 2017-11-22 | 2018-05-01 | 深圳市时代华影科技股份有限公司 | Polarization modulating arrangement, method and the stereoscopic image showing system of stereoprojection light |
| CN108427209A (en) * | 2018-04-18 | 2018-08-21 | 深圳市时代华影科技股份有限公司 | Polarization modulating arrangement, method and the stereoscopic image showing system of stereoprojection light |
| CN109410769A (en) * | 2018-12-28 | 2019-03-01 | 厦门天马微电子有限公司 | Transparent display panel and its control method, display device |
| CN112034618A (en) * | 2019-05-17 | 2020-12-04 | 未来（北京）黑科技有限公司 | Light control device and passive light-emitting image source |
| CN113176672A (en) * | 2021-05-10 | 2021-07-27 | 深圳市光舟半导体技术有限公司 | Single projecting apparatus 3D formation of image's AR glasses |
| CN113741135A (en) * | 2021-09-27 | 2021-12-03 | 青岛海信激光显示股份有限公司 | Projection screen and projection device |
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2012
- 2012-01-06 CN CN201220007316XU patent/CN202631942U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103976820A (en) * | 2014-04-30 | 2014-08-13 | 信利半导体有限公司 | Electric welding mask and driving circuit thereof |
| CN107976820A (en) * | 2017-11-22 | 2018-05-01 | 深圳市时代华影科技股份有限公司 | Polarization modulating arrangement, method and the stereoscopic image showing system of stereoprojection light |
| CN108427209A (en) * | 2018-04-18 | 2018-08-21 | 深圳市时代华影科技股份有限公司 | Polarization modulating arrangement, method and the stereoscopic image showing system of stereoprojection light |
| CN109410769A (en) * | 2018-12-28 | 2019-03-01 | 厦门天马微电子有限公司 | Transparent display panel and its control method, display device |
| CN109410769B (en) * | 2018-12-28 | 2021-03-30 | 厦门天马微电子有限公司 | Transparent display panel, control method thereof and display device |
| CN112034618A (en) * | 2019-05-17 | 2020-12-04 | 未来（北京）黑科技有限公司 | Light control device and passive light-emitting image source |
| CN113176672A (en) * | 2021-05-10 | 2021-07-27 | 深圳市光舟半导体技术有限公司 | Single projecting apparatus 3D formation of image's AR glasses |
| CN113741135A (en) * | 2021-09-27 | 2021-12-03 | 青岛海信激光显示股份有限公司 | Projection screen and projection device |
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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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Granted publication date: 20121226 |
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