CN103792781B - Optical system for stereoprojection and method for carrying out stereoprojection - Google Patents
Optical system for stereoprojection and method for carrying out stereoprojection Download PDFInfo
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- CN103792781B CN103792781B CN201410059065.3A CN201410059065A CN103792781B CN 103792781 B CN103792781 B CN 103792781B CN 201410059065 A CN201410059065 A CN 201410059065A CN 103792781 B CN103792781 B CN 103792781B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B35/00—Stereoscopic photography
- G03B35/18—Stereoscopic photography by simultaneous viewing
- G03B35/26—Stereoscopic photography by simultaneous viewing using polarised or coloured light separating different viewpoint images
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B35/00—Stereoscopic photography
- G03B35/18—Stereoscopic photography by simultaneous viewing
- G03B35/22—Stereoscopic photography by simultaneous viewing using single projector with stereoscopic-base-defining system
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Abstract
The invention relates to an optical system for stereoprojection. The optical system for the stereoprojection comprises an object image and a projection objective. The optical system is provided with a transmission light path and a reflection light path. The optical system comprises a polarization beam splitter and a first liquid crystal variable phase retarder in the transmission light path, and the optical system comprises the polarization beam splitter, a first lens or a first lens set, a second lens or a second lens set, a plane mirror having an image rotating function and a second liquid crystal variable phase retarder in the reflection light path, wherein the polarization beam splitter comprises a first triangular prism, a second triangular prism, first plate glass and second plate glass. The invention further provides a method for carrying out the stereoprojection. The optical system can transform more than 97% of the energy of natural light into linearly polarized light, and screen brightness and stereo display fidelity are improved greatly.
Description
Technical field
The present invention relates to 3d stereo projection display field, relate more specifically to a kind of optical system for stereoprojection and
The method carrying out stereoprojection, the energy polarization of natural light more than 97% can be line polarized light by this optical system, greatly improves
Picture brightness and stereo display fidelity.
Background technology
With the premiere of A Fanda 3d stereoscopic motion picture in 2009, the world's interior 3d upsurge of all sounding on a large scale, most of at present
Movie theatre all supports that 3d plays, wherein with display chip for Texas Instrument dmd (digital micro mirror device, numeral
Micro-mirror element) dlp (digital light procession, digital optical processing) projector adopted by most of movie theatres.
Light source used by it is xenon lamp, and the light being sent is natural light, and that is, polarization state randomly generates, and realizes stereo display
Need to be polarized to line polarized light, then use LC variable phase delayer (liquid crystal variable
Retarder, abbreviation lcvr) it is modulated, then right and left eyes image timesharing enters right and left eyes, to reach stereo display
Effect.Because the method that tradition produces line polarized light is to be directly added into dichroic polarizing piece, dichroism before projection objective
Polaroid can absorb to the electric vector light parallel to absorption axiss, and more than 55% light energy will be had to be inhaled by polaroid
Receive, this will substantially reduce the display brightness of screen.
Because projector continues broadcasting pictures, that is, more than 55% light energy of outgoing can persistently be absorbed by the polarizer, and this will
Polaroid can be led to heat up, the performance such as its degree of polarization can reduce, and even results in damage.And general polaroid can be attached to liquid crystal can
Become phase delayer surface, the liquid crystal molecule leading in liquid crystal cell also can be absorbed most of heat by this, and liquid crystal molecule is right
The highstrung material of temperature, this will affect its double refractive inde, leads to its o that polarizes, and the optical path difference of e light also can change even
Lost efficacy, and then affected the three-dimensional visual effect that screen shows.
Due to energy loss more than 55%, in order to improve display brightness, movie theatre can adopt the xenon lamp of more power, significantly carries
High cost, and higher xenon lamp power, it will lead to more energy to be absorbed by the polarizer, make polaroid and liquid crystal cell more
It is easily damaged.And the parameter such as degree of polarization of polaroid drastically declines, right and left eyes frame crosstalk will be made to aggravate, 3d stereo display effect
It is greatly reduced, this will be absorbed in the vicious circle of vicious cycle.
Content of the invention
The technical problem to be solved is to provide a kind of polarization for stereoprojection to divide combiner zoom
Optical system and the method carrying out stereoprojection, this optical system makes the luminous energy of projection objective outgoing as often as possible change into polarization
Light, will improve more than 100% than only with the system brightness of dichroic polarizing piece and LC variable phase delayer (lcvr).
The technical problem solving the present invention be the technical scheme is that a kind of optical system for stereoprojection of offer
System, it includes object image and projection objective, and described optical system has transmitted light path and reflected light path；In described transmitted light path
On, described optical system includes a polarization beam splitter and the first LC variable phase delayer；On described reflected light path, described
Optical system includes described polarization beam splitter, the first lens or lens group, the second lens or lens group, has the flat of image rotation effect
Face reflecting mirror and the second LC variable phase delayer；Wherein, described polarization beam splitter include the first triangular prism, the two or three
Angle prism, the first plate glass and the second plate glass；Described polarization beam splitter will be defeated in transmitted light path for the natural light inputting
Go out p light or s light, output p light or s light in reflected light path, make two light paths have same polarization state simultaneously；In described reflected light path
In the first lens or lens group and the second lens or lens group constitute variable focus lens package, picture in screen for the reflected light path can be made
Zoom in or out so as to the axle amplification that hangs down is consistent with described transmitted light path；In described reflected light path, by adjusting described plane
Reflecting mirror, the first lens or lens group and the second lens or lens group make two-way picture be completely superposed；In described transmitted light path
Described first LC variable phase delayer and the described second LC variable phase delayer in described reflected light path all
It is that the line polarized light making input produces birefringence effect, control the windup-degree of liquid crystal molecule to reach output o light using voltage
With e light any phase difference value.
It is preferable that described first lens or lens group and the second lens or lens group are put in the optical system of the present invention
Put between the polarization beam splitter and the second LC variable phase delayer of transmitted light path, so that two-way is drawn to constitute variable focus lens package
Face etc. is big to be overlapped.
It is preferable that the inclined-plane of described first triangular prism and described second triangular prism in the optical system of the present invention
Inclined-plane bonded to each other, described first plate glass is bonded to each other with the exiting surface of described first triangular prism, and described second is flat
Glass sheet is bonded to each other with the exiting surface of described second triangular prism.
It is preferable that described first triangular prism, the second triangular prism, the first flat board glass in the optical system of the present invention
Multilayer dielectric film is all plated on the thang-kng surface of glass and the second plate glass.
It is preferable that described plane mirror substrate is using chemically and physically good stability in the optical system of the present invention
Optical glass, on the super-smooth surface of described optical glass plate metal dielectric-coating.
What the technical problem of the solution present invention was adopted another solution is that a kind of side carrying out stereoprojection of offer
Method, it comprises the steps:
The light beam of the random polarization state being sent by object image, after projection objective, the light beam of outgoing continues to propagate forward,
Light beam, after polarization beam splitter, is formed as transmitted light path and reflected light path by the polarization of described polarization beam splitter；
Variable focus lens package, plane mirror and the second LC variable bit phase delay are disposed with described reflected light path
Device, and, the first LC variable phase delayer is provided with described transmitted light path, so that described transmitted light path and anti-
Penetrate picture size in screen for the final focal imaging of light path consistent；
In the described first LC variable phase delayer in described transmitted light path and described in described reflected light path
Second LC variable phase delayer is all that the line polarized light making input produces birefringence effect, controls liquid crystal molecule using voltage
Windup-degree to reach output o light and e light any phase difference value.
In the method for the invention it is preferable that described polarization beam splitter include the first triangular prism, the second triangular prism,
First plate glass and the second plate glass.
In the method for the invention it is preferable that described first triangular prism, the second triangular prism, the first plate glass and
Multilayer dielectric film is all plated on the thang-kng surface of the second plate glass.
In the method for the invention it is preferable that by the inclined-plane of described first triangular prism and described second triangular prism
Inclined-plane is bonded to each other, will be bonded to each other with the exiting surface of described first triangular prism for described first plate glass, by described second
Plate glass is bonded to each other with the exiting surface of described second triangular prism.
In the method for the invention it is preferable that described variable focus lens package includes the polarization beam splitter being placed on transmitted light path
The first lens and the second LC variable phase delayer between or lens group and the second lens or lens group.
Compared with prior art, the advantage of the optical system of the present invention is: introducing polarization beam splitter in the present invention will
Make the degree of polarization of optical system higher, reach more than 99.999%, make right and left eyes frame crosstalk rate lower, 3d stereo display effect
More preferably, the Consumer's Experience making theater viewers greatly improves.Further, since present invention introduces polarization beam splitter makes in lcvr assembly
The heat that liquid crystal cell absorbs is greatly reduced that (traditional approach liquid crystal cell will absorb more than 50% heat, and the present invention can make liquid crystal cell
Absorb heat and be reduced to less than 2%), liquid crystal molecule steady operation in normal temperature, lcvr polarization line polarized light is left or right
Circularly polarized light, screen display picture stereoeffect can stably keep, and makes system reliability service.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is a kind of index path of optical system for stereoprojection of the present invention.
Fig. 2 is using visible ray-spectrophotometer actual measurement gained polarization beam splitter transmitted light path optical characteristics data (curve
A) data (curve comparison figure of curve b) with prior art gained.
Fig. 3 is the polarization beam splitter reflected light path optical characteristics data (song surveying gained using visible ray-spectrophotometer
Line c) and the data (curve comparison figure of curve d) of prior art gained.
Fig. 4 is the sample room that LC variable phase delayer (lcvr) is individually placed in visible ray-light path of spectrophotometer
In, surveyed using natural light incidence and obtain being polarized to transmitance after circularly polarized light with regard to LC variable phase delayer (lcvr)
Curve (curve e) and the prior art curve obtained (comparison diagram of curve f).
Fig. 5 be line polarized light (p light or s light) be incident to before LC variable phase delayer (lcvr) using visible ray-point
The actual measurement of light photometric analyzing module obtain with regard to optical system degree of polarization curve (curve h) and prior art curve obtained
(the comparison diagram of curve i).
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The polarization of the present invention divides the optical system of combiner zoom will come from the object image in projection objective focal plane first
The natural light (random polarization state) being sent is changed into p light after polarization beam splitter simultaneously or changes into s light simultaneously, i.e. transmission
Light path and reflected light path have identical polarization state, the LC variable phase delayer (lcvr) in transmitted light path and reflected light path
By synchronous polarization polarized light, timesharing output left and right circularly polarized light, the picture that transmitted light path and reflected light path are formed will be in screen
On essentially coincide, brightness greatly improves, and conventional art with only the luminous energy on transmitted light path one tunnel, and sponges reflected light path
In energy, the present invention takes full advantage of luminous energy, makes picture display brightness improve more than 100% relative to prior art mode.
As long as spectators wear the glasses with 1/4 bit phase delay film and polaroid, the stereoprojection effect of picture just can be watched.
Fig. 1 is that a kind of polarization for stereoprojection disclosed by the invention divides the optical system of combiner zoom corresponding light
Lu Tu.Generally speaking, the optical system of polarization point combiner zoom can include object image 101 (such as come from dmd chip or its
It can send the thing of image information light), polarization beam splitter (include the first triangular prism 103, the second triangular prism 104, first
Plate glass 105 and the second plate glass 106), the first LC variable phase delayer 107, the first lens or lens group 108,
Second lens or lens group 109, plane mirror 110, the second LC variable phase delayer 111.
Generally speaking, the polarization for stereoprojection divides the operation principle of the optical system of combiner zoom as follows: by thing
The light beam of image (such as come from dmd chip or other can send the thing of image information light) the 101 random polarization states sending, leads to
After crossing projection objective 102, the natural light of outgoing continues to propagate forward, and the light beam being similar to directional light passes through this polarization beam splitter
Afterwards, it is polarized to the line polarized light that two different directions are propagated, and two-way light has same polarization state, that is, a branch of continue to forward pass
The p light (or s light) broadcast, another p light (or s light) restrainted as reflecting upwards, the light due to reflecting upwards needs to travel to as image rotation
In screen, so light beam steering made by plane mirror to be added 110.Hypothesis does not add variable focus lens package in the optical path, and (first is saturating
Mirror or lens group 108 and the second lens or lens group 109), then transmitted light path and the final focal imaging of reflected light path are in screen
Picture be cause not of uniform size, that is, reflected light path project to screen picture overall dimensions bigger than normal, so need add zoom
Lens group makes the vertical axle amplification of the optics of reflected light path reduce, and makes and shows in screen that two-way projected picture is in the same size, naked eyes are felt
Feel just as only having a road light projection to come in.By moving up and down variable focus lens package (the first lens or lens group 108 and second
Lens or lens group 109) relative position, can make picture entirety size change, final sum transmitted light path images match.Instead
The p light (or s light) penetrated in light path passes through variable focus lens package (the first lens or lens group 108 and the second lens or lens group 109)
Afterwards, the second LC variable phase delayer 111 will be passed through, now its polarization state with mutually will be prolonged by the first LC variable position
Light beam in the transmitted light path of device 107 has same polarization state (be all p light or be all s light) late.This first LC variable position
The function of phase retarder 107 and the second LC variable phase delayer 111 is completely the same, can be produced different by circuit sequence
The pulse voltage of amplitude is controlling liquid in the first LC variable phase delayer 107 and the second LC variable phase delayer 111
The liquid crystal molecule deflection angle of brilliant box, the different birefringence level of different deflection angle correspondences, to produce not to o light and e light
Same phase-delay value.The first liquid crystal can be passed through by setting the incident line polarized light (p light or s light) of suitable magnitude of voltage order
After variable phase delayer 107 or the second LC variable phase delayer 111, export left light or right-hand circularly polarized light, root
According to circuit sequence, (general 3d stereoscopic motion picture frame frequency is 144hz, that is, according to exporting left eye picture 72 width in sequential one cycle, then
Output right eye picture 72 width) the timesharing output left light and corresponding voltage magnitude of right-hand circularly polarized light, left light and the right side
Circularly polarized light is produced left-eye image and eye image by modulation respectively.Optical system timesharing output from polarization point combiner zoom
Continuation is propagated to forward screen 112 by left light or right-hand circularly polarized light, left light or right-hand circularly polarized light, and (screen is general
Protect the metal screen that polarization state acts on, gain more than 1.8～2.4 using having) it is imaged, left light or right-hand circularly polarized light will
Reflect the corresponding left eye entering people of timesharing and right eye, obtain stereos copic viewing effect true to nature.
This projection objective 102 is the internal optical system of projector (or projector), also referred to as projection lens, movie theatre one
As the projection of object lens all adapt to this scope than the optical system in 1.0～4.0:1, the present invention.
This polarization beam splitter includes the first triangular prism 103, the second triangular prism 104, the first plate glass 105 and second
Plate glass 106, wherein, this first triangular prism 103, the second triangular prism 104, the first plate glass 105 and the second flat board
Multilayer dielectric film is all plated on each thang-kng surface on glass 106, and film layer material therefor, thickness and plated film order are by Maxwell
Equation group and interference diffraction theoretical solution gained, by plated film software optimization and examination plating checking determination optimal solution repeatedly.This first
The light path knot of Fig. 1 pressed respectively by triangular prism 103, the second triangular prism 104, the first plate glass 105 and the second plate glass 106
Glued one by one shown in structure (i.e. the inclined-plane of the inclined-plane of this first triangular prism 103 and the second triangular prism 104 is bonded to each other, and first
Plate glass 105 is bonded to each other with the exiting surface of the first triangular prism 103, the second plate glass 106 and the second triangular prism 104
Exiting surface bonded to each other).And can by control this first plate glass 105 and the second plate glass 106 material and
Plated film system of institute is making polarization beam splitter transmission simultaneously and reflection p light or s light.This first plate glass 105 and the second plate glass
106 material can be quartz, fish-eye stone and Muscovitum, in its plated surface anti-reflection membrane system and position phase membrane system.
With respect to the polarization beam apparatus of prior art, the polarization beam splitter advantage in the present invention be to make transmitted light beam and
The reflected beams have same polarization state after leaving polarization beam splitter, and the transmitance in visible waveband and reflectance significantly larger than general
Logical polarization beam apparatus.As shown in Figures 2 and 3, the polarization beam splitter mean transmissivity in the present invention is up to 99%, and routine polarizes
Beam splitter mean transmissivity is less than 70%, and in reflected light path, polarization beam splitter average reflectance is up to 96%, and routine polarizes
Only 65% about, far below the polarization beam splitter performance of the present invention, i.e. polarization in the present invention divides beam splitter average reflectance
Light device reaches 97.5% to the average utilization of luminous energy, deducts the light pass surface reflection loss of polarization beam splitter and air contact, pole
Change beam splitter and 97% also can be reached to the average utilization of luminous energy, the reflected energy on thang-kng surface why can be made to lose so
Low, it is because that each optical element of the present invention all obtains optimal Coating Materials and thickness with physical opticses principle solving, make every
The optical energy loss of individual optical element substantially reduces.Plated film material therefor can be Afluon (Asta) mgf2, silicon dioxide sio2, aluminium oxide
al2o3, titanium dioxide tio2, zirconium dioxide zro2, thickness about λ/4, λ is the centre wavelength value of wave band used during Film Design,
The present invention adopts 520nm as centre wavelength, is entered using the software with optical thin film design and analytic function during optimization design
OK, the optical software zemax for example with radiant zemax company of the U.S. is optimized design.For example: the present invention can adopt
Aluminium fluoride alf3With Afluon (Asta) mgf2Make simplest double layer antireflection film, ground floor is air, the second layer is Afluon (Asta) mgf2, thick
Degree 614.2nm, third layer is aluminium fluoride alf3, thickness 596.5nm, the 4th layer is material substrate, and the substrate of the present invention can adopt
Arbitrarily trade mark material, only need to make optimization design according to corresponding refractive index just can solve initiating structure.The membrane system number of plies is more, excellent
The effect dissolving is better, and that is, anti-reflection performance is better, and according to the ultimate principle of above-mentioned double layer antireflection example, the present invention may also be employed
More than 10 layers of different Coating Materials and thickness realize anti-reflection characteristic, make all thang-kng surfaces (reflecting mirror table of this optical system
Except face) visible waveband average reflectance be less than 0.3%.
With respect to plate polarization beam apparatus, advantage also resides in plate polarization beam apparatus to polarization beam splitter in the present invention
Because two light pass surfaces tilt to be placed in light path, greatly increase Modustatine and coefficient, so that the aberration of optical system is increased, and
In reflected light path, two inclined surfaces all energy reflection lights, produce ghost image in image planes (in screen), have a strong impact on optical system
Image quality, make spectators substantially feel that fuzzy pictures are unclear, reduce Consumer's Experience effect.And the polarization beam splitter energy of the present invention
Overcome this shortcoming, so that optical element is placed in parallel in light path, so that Modustatine and coefficient is reduced, the aberration of optical system becomes big,
And no ghost image is incorporated in screen, Consumer's Experience excellent.
Variable focus lens package (the first lens or lens group 108 and the second lens or lens group 109) belongs to optical zoom, compensates
Group belongs to optical compensation, with respect to the Zoom optical lens group of mechanical compensation, advantage be only need to by offset lens group with respect to
Fixed lens group moves linearly and just enables zoom function.By the first lens or lens group 108 and the second lens or lens group
109 composition variable focus lens package are to adapt to different projector distances, because the different transmitted light path and anti-of leading to of projector distance
The vertical axle amplification penetrating light path is different, in order that two-way image show in screen in the same size, need to wherein one road work
Zoom operation.One of advantage of the present invention be by variable focus lens package (the first lens or lens group 108 and the second lens or
Lens group 109) it is positioned in reflected light path, because if projector is in the optics not adding present invention polarization point combiner zoom
If system front projection picture is just full of whole screen, now add the optical system of polarization point combiner zoom, and
Variable focus lens package (the first lens or lens group 108 and the second lens or lens group 109) is placed in this first plate glass 105
And the first LC variable phase delayer 107 between, then the vertical axle amplification of reflected light path can be led to be more than the vertical axle of transmitted light path
Amplification, that is, the picture marginal area of reflected light path will exceed screen effective coverage, lead to edge picture cannot be examined by human eye
See.And transmitted light path in order to consistent with the vertical axle amplification of reflected light path it is necessary to adjust variable focus lens package in compensation group, make
The picture penetrating light path also becomes larger, until big with the picture of reflected light path etc..This is by the marginal area leading to two-way picture all
Two-way picture integrally could be contracted it is necessary to again optical zoom be made by the optical system of projector itself beyond screen effective coverage
Little until just be full of screen.This will lead to a fatal impact to be exactly that broadcasting 2d film source is inconsistent with the focal length of 3d film source,
Need repeatedly the Zoom factors of cutaway, loaded down with trivial details operation is simultaneously not humane, increased the workload of projectionist.And this
Bright change this way, directly by variable focus lens package (the first lens or lens group 108 and the second lens or lens group 109) put
Be placed on position shown in Fig. 1, the vertical axle amplification of such transmitted light path will with play consistent during 2d film source, that is, transmitted light path project to
The picture of screen is just full of screen, and the vertical axle amplification of reflected light path is more bigger than transmitted light path (is not carrying out lens group
Before zoom).In order to be contracted to just be full of screen the projected picture in reflected light path, need that (first is saturating by variable focus lens package
Mirror or lens group 108 and the second lens or lens group 109) make zoom operation, the slow compensation group that adjusts moves linearly until two
Road picture etc. is big to be overlapped.
The first lens in this variable focus lens package or lens group 108 and the second lens or lens group 109 can pass through single order light
Learn principle and primary aberration theory simultaneous solution obtain the first lens or lens group 108 and the second lens or lens group 109 just
Beginning structure, the first lens or lens group 108 and the second lens or lens group 109 can be using its arbitrary group as zoom group, another group
As compensation group, only just initial solution need to can be obtained further with varifocal optical system correlation theory simultaneous differential equations, then
Repeatedly optimized using optical software the different projector distances enabling optical focal distance setting system in the present invention to mate different movie theatres and
Projection ratio.
Plane mirror 110 substrate in the present invention adopts the chemically and physically splendid optical glass of stability, in this light
Learn plating metal dielectric-coating on the super-smooth surface of glass it is seen that optical band reflectance is up to 99%, and general surface is aluminized reflection
Mirror average reflectance only has 85% about, and in other words, luminous energy is by further loss 15%, and used by the present invention, reflecting mirror only has
1% energy loss, the picture brightness that final screen is shown has greatly improved.
The first LC variable phase delayer 107 in the present invention and the second LC variable phase delayer 111 have excellent
Good uniformity, low light loss and low wavefront distortion, are also equipped with fast response time, the temperature range width of work, and work
Make wave-length coverage width.This first LC variable phase delayer 107 and the second LC variable phase delayer 111 are by filling up liquid
The transparent box composition of brilliant (lc) molecular solution, can be used as variable wave plate.Two parallel surfaces of transparent box are coated with nesa coating, can
Applied voltage on box.In the case of being not powered on pressure, the orientation of liquid crystal molecule is determined by alignment film.After alternating voltage,
Liquid crystal molecule can change default orientation according to the alive root-mean-square value of institute.Therefore, the bit phase delay value of linearly polarized light beam can be led to
Cross the voltage added by changing and carry out active control.LC variable phase delayer has extremely short response time, reaches microsecond amount
Level, in other words, conversion from low birefringence to high birefringence rate for the LC variable phase delayer (lcvr) under normal conditions
Speed is very fast.The response speed being exceedingly fast, make LC variable phase delayer modulate right and left eyes image when switch speed faster,
Black field time is shorter, and crosstalk is less, and in screen, the picture brightness of display is higher.The present invention is by the first LC variable phase delayer
107 and second LC variable phase delayer 111 be placed in light path outermost lateral dominance and be, allow liquid crystal layer surface unit area to connect
The illuminance being subject to is lower evenly, and the temperature rising that is, liquid crystal molecule absorption per unit area part luminous energy produces is less, and liquid crystal
Molecule is highstrung material to temperature, and with the rising of temperature, density of material reduces, and retardance also decreases.And,
The viscosity of liquid crystal material at high temperature can step-down, make the LC variable phase delayer (lcvr) can be light in the case of viscosity reduction
Change places from a State Transferring to another state, lead to right and left eyes bit phase delay entanglement, right and left eyes picture can be led to occur
The phenomenon of crosstalk.So the first LC variable phase delayer 107 and the second LC variable phase delayer 111 are placed in light
Road outermost can make the uniformity of LC variable phase delayer (lcvr) and contrast and Phase delay all have optimal
Performance.
As shown in figure 4, will be independent to the first LC variable phase delayer 107 and the second LC variable phase delayer 111
It is placed in visible ray-spectrophotometer sample room, record the first LC variable phase delayer 107 and the first LC variable position phase
Natural light is polarized to the transmittance curve of circularly polarized light by delayer 111, the transmittance curve of contrast prior art gained hence it is evident that
Show that its transmitance is lower than the LC variable phase delayer of the present invention, and in blue light and red spectral band transmitance more significantly
Decline, this will lead to picture chromenence value skew, and the LC variable phase delayer in the present invention hardly occurs
Colour cast situation.
In the light path of polarization point combiner varifocal optical system, LC variable phase delayer incided by Fig. 5
The degree of polarization of the line polarized light before liquid crystal cell is understood with the degree of polarization curve comparison figure of prior art gained, the polarization in the present invention
Degree may be up to 99.999%, and far above the degree of polarization numerical value of prior art, higher degree of polarization is it is meant that purer line polarized light
Enter LC variable phase delayer, modulated purer right and left eyes image, make the crosstalk of right and left eyes picture less, three-dimensional effect
Fruit is more true to nature.
In embodiments of the present invention, the natural light of input can be exported p light or s light in transmitted light path by polarization beam splitter,
Output p light or s light in reflected light path, make two light paths have same polarization state simultaneously.And the first lens in reflected light path or
Lens group and the second lens or lens group constitute variable focus lens package, picture in screen for the reflected light path can be made to zoom in or out, make
Its vertical axle amplification is consistent with transmitted light path, and that is, the picture of two light paths is in the same size.Plane mirror in reflected light path has
The effect of image rotation, can make two-way picture by adjusting plane mirror, the first lens or lens group and the second lens or lens group
It is completely superposed.The second LC variable bit phase delay in the first LC variable phase delayer and reflected light path in transmitted light path
Utensil has identical function it is simply that the line polarized light of input can be made to produce birefringence effect, controls liquid crystal molecule using voltage
The effect to reach output o light and e light any phase difference value for the windup-degree.Only need in the present invention make o, e light timesharing export
± 1/4 λ optical path difference just enables stereo display effect, and the circuit sequence of control LC variable phase delayer is defeated with projector
The 3d signal demand going out is synchronous, and that is, line polarized light just timesharing can produce left and right circular polarization after LC variable phase delayer
Light.
In some implementations, first lens of the present invention or lens group 108 and the second lens or lens group 109 can be placed in
Between the polarization beam splitter of transmitted light path and the second LC variable phase delayer 111, its effect is also to constitute variable focus lens package,
Make the big coincidence such as two-way picture.
In addition, the polarization beam splitter in the present invention is with respect to common polarization beam apparatus, advantage be its can by transmission and
Reflection two-way light is polarized to identical polarization state, and transmitted light can only be polarized to p light by common polarization beam apparatus, and reflected light
It is polarized to s light, the present invention can be polarized to p light simultaneously or be polarized to s light simultaneously, make the structure more compact and reasonable of optical system.
Generally speaking, the present invention is used for design and the method bag of stereoprojection with regard to polarization point combiner varifocal optical system
Include the image object light receiving random polarization state in polarization beam splitter.Said method includes propagating to transmitted light path in polarization beam splitter
The light of p or s polarization state.It is additionally included in the light that polarization beam splitter propagates p or s polarization state to reflected light path.And above-mentioned two
The light beam that light path is transmitted has identical polarization state, that is, simultaneously for p light or simultaneously for s light.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of optical system for stereoprojection, it include object image and projection objective it is characterised in that: described optical system
System has transmitted light path and reflected light path；On described transmitted light path, described optical system includes a polarization beam splitter and first
LC variable phase delayer；On described reflected light path, described optical system include described polarization beam splitter, the first lens or
Lens group, the second lens or lens group, the plane mirror with image rotation effect and the second LC variable phase delayer；Its
In, described polarization beam splitter includes the first triangular prism, the second triangular prism, the first plate glass and the second plate glass；
The natural light inputting is exported p light or s light in transmitted light path by described polarization beam splitter, exports in reflected light path simultaneously
P light or s light, make two light paths have same polarization state；The first lens in described reflected light path or lens group and the second lens
Or lens group constitutes variable focus lens package, picture in screen for the reflected light path can be made to zoom in or out so as to hang down axle amplification and institute
State transmitted light path consistent；In described reflected light path, by adjusting described plane mirror, the first lens or lens group and second
Lens or lens group make two-way picture be completely superposed；Described first LC variable phase delayer in described transmitted light path and
Described second LC variable phase delayer in described reflected light path is all to make the line polarized light of input produce birefringence effect
Should, control the windup-degree of liquid crystal molecule to reach output o light and e light any phase difference value using voltage.
2. the optical system for stereoprojection according to claim 1 it is characterised in that: described first lens or lens
Group and the second lens or lens group are placed between the polarization beam splitter of transmitted light path and the second LC variable phase delayer, with
Constituting variable focus lens package makes the big coincidence such as two-way picture.
3. the optical system for stereoprojection according to claim 1 it is characterised in that: described first triangular prism
The inclined-plane of inclined-plane and described second triangular prism is bonded to each other, and described first plate glass goes out light with described first triangular prism
Face is bonded to each other, and described second plate glass is bonded to each other with the exiting surface of described second triangular prism.
4. the optical system for stereoprojection according to claim 3 it is characterised in that: described first triangular prism,
Multilayer dielectric film is all plated on the thang-kng surface of the second triangular prism, the first plate glass and the second plate glass.
5. the optical system for stereoprojection according to claim 1 it is characterised in that: described plane mirror substrate
Using the optical glass of chemically and physically good stability, metal dielectric-coating is plated on the super-smooth surface of described optical glass.
6. a kind of method carrying out stereoprojection it is characterised in that: it comprises the steps:
The light beam of the random polarization state being sent by object image, after projection objective, the light beam of outgoing continues to propagate forward, light beam
After polarization beam splitter, transmitted light path and reflected light path are formed as by the polarization of described polarization beam splitter；
Variable focus lens package, plane mirror and the second LC variable phase delayer are disposed with described reflected light path,
And, the first LC variable phase delayer is provided with described transmitted light path, so that described transmitted light path and reflection
Picture size in screen for the final focal imaging of light path is consistent；
In the described first LC variable phase delayer and in described reflected light path described second in described transmitted light path
LC variable phase delayer is all that the line polarized light making input produces birefringence effect, controls the torsion of liquid crystal molecule using voltage
Gyration is to reach output o light and e light any phase difference value.
7. the method carrying out stereoprojection according to claim 6 it is characterised in that: described polarization beam splitter includes first
Triangular prism, the second triangular prism, the first plate glass and the second plate glass.
8. the method carrying out stereoprojection according to claim 7 it is characterised in that: described first triangular prism, second
Multilayer dielectric film is all plated on the thang-kng surface of triangular prism, the first plate glass and the second plate glass.
9. the method carrying out stereoprojection according to claim 7 it is characterised in that: described first triangular prism is oblique
The inclined-plane of face and described second triangular prism is bonded to each other, and described first plate glass and described first triangular prism gone out light
Face is bonded to each other, will be bonded to each other with the exiting surface of described second triangular prism for described second plate glass.
10. the method carrying out stereoprojection according to claim 6 it is characterised in that: described variable focus lens package includes putting
Put the first lens between the polarization beam splitter and the second LC variable phase delayer of transmitted light path or lens group and second
Lens or lens group.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059065.3A CN103792781B (en) | 2014-02-21 | 2014-02-21 | Optical system for stereoprojection and method for carrying out stereoprojection |
| PCT/CN2014/073558 WO2015123901A1 (en) | 2014-02-21 | 2014-03-17 | Optical system for stereoprojection and projection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059065.3A CN103792781B (en) | 2014-02-21 | 2014-02-21 | Optical system for stereoprojection and method for carrying out stereoprojection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103792781A CN103792781A (en) | 2014-05-14 |
| CN103792781B true CN103792781B (en) | 2017-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410059065.3A Ceased CN103792781B (en) | 2014-02-21 | 2014-02-21 | Optical system for stereoprojection and method for carrying out stereoprojection |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103792781B (en) |
| WO (1) | WO2015123901A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111448506A (en) * | 2017-10-11 | 2020-07-24 | Volfoni研发公司 | Stereoscopic three-dimensional projection system with short throw ratio |
| WO2021144599A1 (en) * | 2020-01-14 | 2021-07-22 | Volfoni R&D | High brightness stereoscopic 3d projection system |
| CN115691383B (en) * | 2022-09-27 | 2023-12-22 | 惠科股份有限公司 | Display device and image display method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07248406A (en) * | 1994-03-09 | 1995-09-26 | Pioneer Electron Corp | Reflecting mirror |
| US20090096990A1 (en) * | 2007-10-11 | 2009-04-16 | Hon Hai Precision Industry Co., Ltd. | Stereo projection optical system |
| CN201974582U (en) * | 2010-09-29 | 2011-09-14 | 北京中视中科光电技术有限公司 | Projection display device |
| CN103048798A (en) * | 2012-12-29 | 2013-04-17 | 深圳市时代华影科技开发有限公司 | High-light-efficiency light modulation device and high-light-efficiency (3-dimensional) 3D projection system |
| CN203688987U (en) * | 2014-02-21 | 2014-07-02 | 深圳市格特斯电子有限公司 | Optical system used for stereoscopic projection |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008251353B2 (en) * | 2007-05-09 | 2014-05-22 | Reald Inc. | Polarization conversion system and method for stereoscopic projection |
| US8820937B2 (en) * | 2010-08-17 | 2014-09-02 | Lc-Tec Displays Ab | Optical polarization state modulator assembly for use in stereoscopic three-dimensional image projection system |
| CN102520575A (en) * | 2011-12-30 | 2012-06-27 | 中国科学技术大学 | Three-dimensional projection display system based on liquid crystal polarization rotation |
| CN203433207U (en) * | 2013-06-27 | 2014-02-12 | 瑞尔D股份有限公司 | Polarization conversion system and projection system using polarized lights to code stereo image |
| CN203405635U (en) * | 2013-09-05 | 2014-01-22 | 深圳市时代华影科技开发有限公司 | Stereographic projection device with low projection ratio and high lighting effect and stereographic projection system |
-
2014
- 2014-02-21 CN CN201410059065.3A patent/CN103792781B/en not_active Ceased
- 2014-03-17 WO PCT/CN2014/073558 patent/WO2015123901A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07248406A (en) * | 1994-03-09 | 1995-09-26 | Pioneer Electron Corp | Reflecting mirror |
| US20090096990A1 (en) * | 2007-10-11 | 2009-04-16 | Hon Hai Precision Industry Co., Ltd. | Stereo projection optical system |
| CN201974582U (en) * | 2010-09-29 | 2011-09-14 | 北京中视中科光电技术有限公司 | Projection display device |
| CN103048798A (en) * | 2012-12-29 | 2013-04-17 | 深圳市时代华影科技开发有限公司 | High-light-efficiency light modulation device and high-light-efficiency (3-dimensional) 3D projection system |
| CN203688987U (en) * | 2014-02-21 | 2014-07-02 | 深圳市格特斯电子有限公司 | Optical system used for stereoscopic projection |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015123901A1 (en) | 2015-08-27 |
| CN103792781A (en) | 2014-05-14 |
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Address after: Eighth, Fuhua Industrial Zone, Tong Hang community, Fuyong street, Baoan District, Guangdong, Shenzhen 518000 Applicant after: Shenzhen future stereo Technology Co., Ltd. Address before: Eighth, Fuhua Industrial Zone, Tong Hang community, Fuyong street, Baoan District, Guangdong, Shenzhen 518000 Applicant before: SHENZHEN GETTEKS ELECTRONICS CO., LTD. |
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Effective date of registration: 20170815 Address after: 518000 Nanshan District science and technology building, No. 9, 1701 research road, Guangdong, Shenzhen Province, 17 Patentee after: Shenzhen future stereo Education Technology Co., Ltd. Address before: Eighth, Fuhua Industrial Zone, Tong Hang community, Fuyong street, Baoan District, Guangdong, Shenzhen 518000 Patentee before: Shenzhen future stereo Technology Co., Ltd. |
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