CN208903081U - A kind of color holographic display system - Google Patents
A kind of color holographic display system Download PDFInfo
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- CN208903081U CN208903081U CN201821318992.2U CN201821318992U CN208903081U CN 208903081 U CN208903081 U CN 208903081U CN 201821318992 U CN201821318992 U CN 201821318992U CN 208903081 U CN208903081 U CN 208903081U
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Abstract
The application provides a kind of color holographic display system, comprising: light source unit, beam collimation unit and modulation display unit；The light source unit, beam collimation unit and modulation display unit are arranged to, and the white light beam that the light source unit generates is irradiated to the beam collimation unit, and after the beam collimation unit is collimated and polarized, is irradiated to the modulation display unit.Only need a spatial light modulator that can reproduce three-dimension object RGB three-component information simultaneously as soon as the application provides a kind of color holographic display system, the structure of the color three dimension holographic display system described in this way becomes simply, and cost is lower.The application is not necessary to timing and shows tri- components of RGB, will not generate visual flickering, of less demanding to SLM refresh rate, has higher image quality.Color display system provided by the present application not will receive the influence of secondary picture when showing the reproduction image of the hologram.
Description
Technical field
It is prior this application involves color three dimension holography display field, be related to a kind of method for generating holograms and with
The matched a kind of color holographic display system of hologram that this method generates.
Background technique
With the development of image processing techniques, hologram and line holographic projections have in our daily life and work production
Broad application prospect.Specifically, the capacity usage ratio of hologram and line holographic projections is much higher than tradition especially in display field
Projection, and have it is small in size, structure is simple, and without dead pixel points of images, the advantages such as stability is good, at present color three dimension holography is shown
Technology is because its very three-dimensional display characteristic is widely paid close attention to, and at this stage, it is aobvious that scholars propose a variety of color holograms
The implementation method shown, can be roughly divided into two types, and one kind is that the colour information that conventional photographic application holographic dry plate is realized is shown, separately
One kind is to calculate the colour information that holographic applications optical modulation device carrying hologram is realized to show.It is rapid with computer technology
Develop and universal, the advanced method for calculating holographic technique as a kind of holographic display has obtained great development.
It calculates holographic technique and mainly goes out computed hologram (Computer- first with Design of Computer Algorithms
Generated Holograms), it is then controlled by computer and computed hologram is loaded on SLM, be loaded with hologram
SLM illuminating bundle can be modulated, can be imaged on modulated beam diffraction to screen, current computed hologram master
There are amplitude type and two kinds of phase type, corresponding spatial light modulator has amplitude type, phase type and Amplitude & Phase to have both type.
Existing method for generating holograms is mostly then to divide object to be shown three width three primary colours holograms of corresponding generation
Three primary colours hologram is not loaded into multiple spatial light modulators, or is successively loaded into the same spatial light modulator, is passed through
Ovennodulation can just show the three-dimensional colour picture of object to display.And few just can not include to aobvious with a width hologram
Show all information of object, i.e., the three-dimensional colour picture of object to be shown is presented with a width hologram.
Due to the generation method of existing hologram, can be achieved at present holographic colored display technology have SLM tiled display method,
The methods of time division multiplexing method, depth multiplexing method, spatial reuse method, rainbow holography method and SLM panel zone multiplexing method.SLM splicing
Explicit representation needs to use three SLM, at high cost, system complex.Time division multiplexing method needs to use synchronous circuit, and to the frame of SLM
Frequency has high requirements, and otherwise can generate visual flickering.Depth multiplexing method and spatial reuse method will receive the shadow of secondary picture
It rings, it is difficult to which at three-dimensional colour picture, and diffraction efficiency is low, and energy dissipation is serious.Rainbow holography method has lost the view of vertical direction
Angle, imaging effect be not good enough.SLM panel zone multiplexing rule has lost resolution ratio.
Utility model content
The application provides a kind of method for generating holograms, cannot enough width holographies to solve existing method for generating holograms
The three-dimensional colour picture of object to be shown can be presented in figure；Object to be shown is being presented in the hologram that existing method for generating holograms generates
The problems such as influence when the reproduction image of body vulnerable to secondary picture.Present invention also provides for showing that the method for generating holograms generates
A kind of color holographic display system of hologram has solved existing color holographic display system complexity, at high cost；Palpus timing is shown
Tri- components of RGB, it is high to the frame rate requirement of SLM, it otherwise can generate visual flickering；The reproduction image of hologram is vulnerable to secondary
The problem of as influencing.
The application provides a kind of method for generating holograms, comprising:
The three primary colours light-wave information and initial light-wave information of the multiple object planes of object to be shown, the initial light-wave information are provided
Amplitude be unit amplitude, phase is random phase；
Simulated in computer program the initial light-wave information holographic facet and the multiple object planes of object to be shown it
Between roundtrip propagation, the initial light-wave information completes in the holographic facet and the multiple object plane roundtrip propagation as a wheel iteration；
In each round iteration, for each primary colours light-wave information, by institute on the holographic facet and the multiple object plane
The amplitude for stating light-wave information replaces with respective objects amplitude, and retains phase, and it is complete that three primary colours is then obtained on the holographic facet
Breath figure；
The three primary colours sub-hologram is averagely turned into color hologram；
The light-wave information of the color hologram is brought into next round iteration as the new initial light-wave information, until
When obtaining the color hologram of reproducible three-dimensional colour picture, iteration is terminated.
Optionally, in each round iteration, there is multiple and different depth between the holographic facet and the multiple object plane.
Optionally, the three primary colours light-wave information is according to means of Fresnel diffraction each independently in the holographic facet and institute
It states and is propagated between multiple object planes.
Optionally, the three primary colours light-wave information is in the holographic facet between the diffraction distance of the corresponding object plane and sampling
Every being all set as identical value simultaneously.
It optionally,, all will be all before the three primary colours sub-hologram is averagely turned to color hologram in each round iteration
Phase is that the balzed grating, of two pixels is attached on the three primary colours sub-hologram.
Optionally, the picture of the three primary colours sub-hologram is moved at the light-wave information of 0 grade of diffraction, and described
The picture that the three primary colours sub-hologram is superimposed on holographic facet constitutes color images.
A kind of color holographic display system, comprising:
Light source unit, beam collimation unit and modulation display unit, in which:
The light source unit, for generating white light beam；
The beam collimation unit is parallel linearly polarized light for collimating and polarizing the white light beam；
The modulation display unit is used to be modulated the parallel linearly polarized light according to the information of corresponding hologram, and
The reproduction image of object to be shown in the information of the hologram is presented；
The light source unit, beam collimation unit and modulation display unit are arranged to, what the light source unit generated
White light beam is irradiated to the beam collimation unit, and after the beam collimation unit is collimated and polarized, is irradiated to the tune
Display unit processed.
Optionally, the light source unit includes tricolor laser device and bundling optical fiber；
The bundling optical fiber is set to the light output path of the tricolor laser device, and the tricolor laser device is sent out
Laser synthesizing out is white light beam and exports.
Optionally, the beam collimation unit includes the aperture filter set gradually along the light output path of the bundling optical fiber
Wave device, beam expanding lens and polarizing film, in which:
The small filter is used to filter out the zero-frequency part of the white light beam；
The extender lens is for expanding the white light beam of the zero-frequency part for plane parallel light；
The polarizing film is for polarizing the plane parallel light for parallel line polarisation.
Optionally, the modulation display unit includes spatial light modulator and display screen, in which:
The spatial light modulator is set to the outgoing route of the linearly polarized light of the beam collimation unit, for receiving
Parallel linearly polarized light is stated, and the parallel linearly polarized light that the beam collimation unit exports is carried out according to the information of corresponding hologram
Modulation, and by modulated light output to the display screen.
Optionally, the spatial light modulator is reflective spatial light modulator.
Optionally, the color holographic display system further includes the computer being connected with the spatial light modulator, is used
In the generation hologram, and the information of the hologram is loaded onto the spatial light modulator.
Optionally, the parallel linearly polarized light is identical as the polarization direction that the spatial light modulator can be modulated.
Optionally, the hologram is phase type hologram, and the spatial light modulator is phase type liquid crystal on silicon space
Optical modulator.
Compared with prior art, the application has the following advantages:
The application provides a kind of method for generating holograms, comprising: provides the three primary colours light wave of the multiple object planes of object to be shown
The amplitude of information and initial light-wave information, the initial light-wave information is unit amplitude, and phase is random phase；In computer journey
Initial light-wave information roundtrip propagation between holographic facet and the multiple object planes of object to be shown is simulated in sequence, it is described initial
Light-wave information is completed in the holographic facet and the multiple object plane roundtrip propagation as a wheel iteration；In each round iteration, for
The amplitude of the light-wave information is replaced with respective objects vibration on the holographic facet and the object plane by each primary colours light-wave information
Width, and retain phase, and three primary colours sub-hologram is obtained on the holographic facet；The three primary colours sub-hologram is averagely turned to
Color hologram；The light-wave information of the color hologram is brought into next round iteration as the new initial light-wave information,
Until terminating iteration when obtaining the color hologram of reproducible three-dimensional colour picture.
The method for generating holograms is logical to carry out more wheel iteration to three primary colours light-wave information, and in each round iterative process
The light-wave information is replaced to amplitude on each object plane and holographic facet and retains phase, it is available after mostly wheel iteration can be with
The phase type color hologram of three-dimensional colour picture is reproduced, the width color hologram is the whole letters that may include object to be shown
Breath, with the method for generating holograms generate hologram present reproduce as when, be not easily susceptible to the influence of secondary picture.
And the hologram is moved to the reproduction image of three primary colours sub-hologram at 0 grade of diffraction light-wave information, and complete
It is superimposed the color images of the picture composition of three primary colours sub-hologram on breath face and then generation is overlapped to three primary colours sub-hologram
Color hologram so the hologram can use 0 grade of diffraction light energy, and has higher diffraction efficiency.
The application also provides a kind of color holographic display system, display system provided by the present application above-mentioned holography for rendering
The hologram that drawing generating method generates, the application, which provides a kind of color holographic display system, only needs a spatial light modulator
Three-dimension object RGB three-component information is reproduced simultaneously, and the structure of the color three dimension holographic display system described so just becomes letter
Single, cost is lower.The application is not necessary to timing and shows RGB (RGB) three components, will not generate visual flickering, right
SLM (spatial light modulator) refresh rate is of less demanding, has higher image quality.Color display system provided by the present application exists
Show the influence that not will receive secondary picture when the reproduction image of the hologram.
Detailed description of the invention
Fig. 1 is a kind of method for generating holograms flow chart of steps provided by the present application.
Fig. 2 is a kind of color three dimension holographic display system schematic diagram provided by the present application.
Fig. 3 is a kind of display flow chart of steps of color three dimension holographic display system provided by the present application.
Fig. 4 is a kind of amplitude provided by the present application and phase replacement process flow chart.
Specific embodiment
Many details are explained in the following description in order to fully understand the application.But the application can be with
Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to the application intension the case where
Under do similar popularization, therefore the application is not limited by following public specific implementation.
The application provides a kind of method for generating holograms, in addition the application provides a kind of color holographic display system.
Embodiment 1
The application provides a kind of method for generating holograms, and the specific embodiment of the method for generating holograms is as follows:
Firstly, determining that the design of the hologram is joined according to the relevant parameter of the hologram spatial light modulator to be loaded into
Number, is then encoded into hologram for three-dimensional scenic to display (object) according to the design parameter of hologram, it is important that such as
How the mode encoded generates hologram, how to three primary colours sub-hologram processing could generate reproduction three-dimensional colour as
Hologram.Because being in the prior art typically all by the corresponding generation three primary colours hologram of object to display, then respectively
Three primary colours hologram is loaded into multiple spatial light modulators, or is successively loaded into the same spatial light modulator, is passed through
Modulation can just show the three-dimensional colour picture of object to display.But method for generating holograms provided by the embodiments of the present application
It is the information of object to be shown to be carried out to Unified coding, and generate a width color hologram, which is loaded into
After one spatial light modulator, three-dimensional colour picture can be reproduced through ovennodulation.As shown in Figure 1, it illustrates the present embodiment provides
A kind of method for generating holograms flow chart of steps specific method and steps be shown below be discussed in detail.In conjunction with Fig. 1 to this
A kind of hologram design method that application embodiment provides is described in detail.
This method is a kind of improvement iterative algorithm to G-S algorithm, which is by by the luxuriant and rich with fragrance alunite of monochrome in G-S algorithm
Ear diffraction is replaced by what colored Fresel diffraction process obtained.
Belong to a kind of computergenerated hologram firstly the need of a kind of method for generating holograms provided in clear the present embodiment
(CGH) technology, CGH are the new formation of hologram technologies generated with development of computer.It is holographic different from traditional optical,
CGH does not need the physical presence of object to be shown, but the object wave light-wave information of the object (a kind of mathematic(al) representation, comprising:
Amplitude, phase all information) after input computer disposal, certain coding mode is taken to generate hologram.Since the application is real
Applying the method for generating holograms provided in example is obtained from passing through the amplitude of replacement light-wave information and retaining phase, so this is complete
The hologram that can reproduce three-dimensional colour picture that breath drawing generating method ultimately generates is pure phase type hologram.The embodiment of the present application
Steps are as follows for a kind of method for generating holograms of middle offer:
Step S11: in each round iteration, for each primary colours light-wave information, on holographic facet and the multiple object plane
The amplitude of the three primary colours light-wave information is replaced with into respective objects amplitude, and retains phase, then on the holographic facet
To three primary colours sub-hologram.
Before executing this step, it is desirable to provide the multiple object plane three primary colours light-wave informations of object to be shown and initial light wave letter
It ceases, the amplitude in the initial light-wave information is unit amplitude, and phase is random phase.The holography provided in the embodiment of the present application
Drawing generating method does not need to ultimately generate the material object of the object to be shown in hologram information, but needs to provide the object to be shown
The object light three primary colours light-wave information and initial light-wave information of body, three primary colours light-wave information are taken out to object light three primary colours light wave
It is obtained after sample, which is equivalent to reference light, for irradiating object plane.Two kinds of light-wave informations are input to computer
In, then simulated in computer program the initial light-wave information holographic facet and the multiple object planes of object to be shown it
Between roundtrip propagation.It should be noted that the method provided in the embodiment of the present application has multiple object planes, the Object light wave on each object plane
Information is different, that is, object to be shown is divided into multiple and different object planes first, then provides multiple object planes respectively again
Object light three primary colours light-wave information.Herein, it is believed that the object plane of object to be shown is that N number of (N is integer and is greater than in the embodiment of the present application
1), each object plane is successively named as object plane 1, object plane 2, object plane 3 ... and so on, until object plane N.
When simulating initial light-wave information roundtrip propagation between holographic facet and multiple object planes, the initial light-wave information
Object plane 1 is traveled to by holographic facet, the first step that the holographic facet is a complete iteration of wheel is then traveled to by object plane 1 again.It is described
It is all the step in a wheel iteration that initial light-wave information, which completes Once dissemination between each different object planes and holographic facet,.It is described first
It is a wheel complete iteration that beginning light-wave information completes Once dissemination between all object planes and holographic facet.That is, initial light wave
Information travels to object plane 1 from holographic facet, then propagates to holographic facet by object plane 1, is the first step in a wheel complete iteration, then
Object plane 2 is propagated to from holographic facet again, it is the second step ... and so in a wheel complete iteration that object plane 2, which propagates to holographic facet,
Until object plane N is a wheel complete iteration.More wheel complete iterations are carried out in the embodiment of the present application, it could final production reproduction
The color hologram of three-dimensional colour picture.By taking the embodiment of the present application wherein first step of a wheel iteration as an example, the behaviour of the second to N step
Make identical with the first step.In each step of each round iteration, for each primary colours light-wave information, in the holographic facet and described
The amplitude of the light-wave information of primary colours each in the three primary colours is replaced with into respective objects amplitude on object plane, and retains phase, and
And three primary colours sub-hologram is obtained on the holographic facet in the last of each round complete iteration.It should be noted that when described
When the initial light-wave information (reference light) of unit amplitude is traveled on object plane 1, the light field of each primary colours light-wave information on object plane 1
It is distributed as U0(x0,y0) (by taking the object light light-wave information of one of primary colours as an example, other two primary colours light-wave informations phase therewith
Together), the optical field distribution after the object light light-wave information diffraction of the object plane 1 can be obtained by means of Fresnel diffraction, and the Fresnel spreads out
The angular spectrum form for penetrating formula is as follows:
Wherein U0(x0,y0), U (x, y) is respectively the optical field distribution before diffraction with the light-wave information after diffraction, and λ is initial light
The optical wavelength of wave information.
Then optical field distribution of the three primary colours light-wave information on object plane 1 after propagating to holographic facet can also use above-mentioned phenanthrene
Nie Er diffraction formula calculates.
In each round iteration, for each primary colours light-wave information, by institute on the holographic facet and all object planes
The amplitude for stating light-wave information replaces with respective objects amplitude, and retains phase.By our available three primary colours of statement above
The light-wave information optical field distribution on object plane 1 and holographic facet before and after diffraction respectively, whether on object plane 1 or on holographic facet
Amplitude replacement and phase invariant after the Diffraction of Light of three primary colours light-wave information.By the three primary colours light-wave information i.e. on object plane 1
The amplitude of each primary colours light-wave information replaces with respective objects amplitude, and retains phase.Amplitude and phase replacement process such as Fig. 4 institute
Show, illustrates a kind of amplitude provided in this embodiment and phase replacement process flow chart.
Wherein, g1For former light field complex amplitude, | g1| for former optical field amplitude, ψnFor light field phase, g2For former light field complex amplitude, |
g0| for former optical field amplitude, former amplitude | g1| it is replaced by target amplitude | g0|, phase ψnRetain.
In each round iteration, the object light three primary colours light-wave information of object to be shown all can be each independently according to Fresnel
Diffraction formula is propagated between the holographic facet and the object plane.That is it is only needed to a kind of color in original G-S algorithm
Light handled, the method in the present embodiment is that the monochromatic treatment process in G-S algorithm is become color process.This Shen
The method that please be provided in embodiment also needs in conjunction with table tennis algorithm, and detailed to be, the holographic facet and the multiple object plane have
Multiple and different depth, multiple and different depth carry out rotation after the completion of each step in a wheel complete iteration.Such as it changes in a wheel
By the value of the depth of the holographic facet and the object plane X is set when the first step in generation, after the first step is fully completed, the
The value that two steps start the depth of the rear holographic facet and the object plane is set as Y, then after second step is fully completed,
The value that three steps start the depth of the rear holographic facet and the object plane is set as Z, and so on, until it is complete repeatedly to carry out a wheel
The final step in generation, it is just that the value of these different depths, which is object to be shown is divided into multiple and different object planes first,
Through determining.The three primary colours light-wave information for thereby realizing object object light to be shown can be in the holographic facet of multiple and different depth
Carry out back propagation between object plane.
When the object light three primary colours light-wave information of the object to be shown is propagated between holographic facet and object plane, needing will be described
The diffraction distance of the object light three primary colours light-wave information of object to be shown and sampling interval are all set as identical value simultaneously.Then it needs
The amplitude of the light-wave information of each primary colours is replaced with into respective objects amplitude on the holographic facet and the object plane and retains phase
Position can finally obtain three primary colours sub-hologram in a wheel complete iteration in doing so.It at this moment will be two in the period
The balzed grating, of a pixel is attached on the three width sub-hologram.Then it carries out in next step.
Step S12: the three primary colours sub-hologram is averagely turned into a width color hologram.
The balzed grating, that period is two pixels is attached on the three width three primary colours sub-hologram, by the three primary colours
The picture of sub-hologram is moved at 0 grade of diffraction light-wave information, and the picture of the three width three primary colours sub-hologram is made to overlap composition
One width color images, and the color images can make full use of the energy of 0 grade of diffraction light, later by three width three primary colours sub-holograms into
Row equalization.
It needs to carry out final step after the three width three primary colours sub-hologram is averagely turned to a width color hologram.
Step S13: substituting into next round iteration for the light-wave information of the color hologram as new initial light-wave information,
Until obtaining the color hologram of reproducible three-dimensional colour picture, iteration is terminated.
The step is will to bring next round iteration by the color hologram generated after step S11 and step S12, due to this
Color hologram is equalized by above-mentioned three primary colours sub-hologram, so the light-wave information of the color hologram includes three bases
At this moment all information of coloured light wave is brought into down the light-wave information of the color hologram as the new initial light-wave information
One wheel iteration, the step of when repeating first round iteration, i.e., repeatedly step S11 and step S12, until obtaining the reproducible three-dimensional of a width
When the color hologram of color images, iteration is terminated.Because the amplitude of initial light-wave information is unit amplitude, phase is random phase
Position, thus needed on holographic facet will comprising three primary colours light-wave information color hologram light-wave information amplitude in holographic facet
On replace with unit amplitude again.Since all the amplitude of light-wave information being replaced on holographic facet and object plane in whole iterative process
It is changed to target amplitude and retains phase, so the hologram ultimately generated is only phase type hologram.
The phase type color hologram that method for generating holograms provided in this embodiment generates only needs the width hologram just
It may include all information of object to be shown, as long as soon as the hologram is loaded onto a spatial light modulator through ovennodulation,
The three-dimensional colour picture of object to be shown can be reproduced.
Embodiment 2
A kind of method for generating holograms is provided in the embodiment of the present application 1, in order to show the coloured silk of phase type made of this method
Color hologram, the present embodiment is corresponding to give a kind of color hologram display system that can show the color hologram three-dimensional colour picture
System.
The application provides a kind of color holographic display system, and the specific embodiment of the display system is as follows:
It is 1980*1080pixels with spatial light modulator resolution ratio in the present embodiment, Pixel Dimensions are the colour of 8um
It is detailed to a kind of color holographic display system progress provided in this embodiment in conjunction with Fig. 2, Fig. 3 for three- dimensional panoramic show system
Explanation.
As shown in Fig. 2, it illustrates a kind of structural schematic diagrams of color three dimension holographic display system provided in this embodiment.
A kind of color three dimension holographic display system provided in this embodiment includes light source unit 1, and beam collimation unit 3 and modulation display are single
Member.Three big units are followed successively by light source unit 1, beam collimation according to its functional character and the sequencing to work from right to left
Unit 3 and modulation display unit.Three big units are on same optical transport straight line, are specifically configured to, and the light source unit 1 generates
White light beam be irradiated to the beam collimation unit 3, and after the beam collimation unit 3 is collimated and polarized, be irradiated to institute
State modulation display unit.
Wherein, the light source unit 1 is for generating white light beam；The beam collimation unit 3 is for collimating and polarizing institute
Stating illumination white light beam is parallel linearly polarized light；The modulation display unit is used for the information according to corresponding color hologram to institute
It states parallel linearly polarized light to be modulated, and the reproduction image of object to be shown in the information of the color hologram is presented.It needs
Bright, which is all to replace the amplitude of light-wave information on object plane and holographic facet in an encoding process and retain phase
The phase type hologram of position, the width color hologram are the 3-d reproduction picture that reproduce object to be shown.
The optical unit 1 includes tricolor laser device and bundling optical fiber 2.The tricolor laser device is red by 635nm
Optical semiconductor laser 11,13 3 kinds of differences of 532nm green light solid frequency double laser 12 and 445nm blue semiconductor laser
Laser constitution.The tricolor laser device is for providing three primary colours red (R) green (G) blue (B) laser light source, the present embodiment
Described in tri-color laser can be generated feux rouges, green light, blue light wavelength be respectively 635nm, 532nm, 445nm, by this Shen
Display system please, which is applied to also can choose when other situations, can generate other values in three color wave-length coverage of red, green, blue
The laser of wavelength, wherein the wave-length coverage of feux rouges is about 625nm-740nm, and the wave-length coverage of green light is about 500nm-
560nm, the wave-length coverage of blue light are 440nm-485nm.The type of three lasers of red, green, blue in the tricolor laser device
Can also difference as the case may be neatly select, such as can using three gases that can generate RGB laser
Laser forms tri-color laser.
By the red light semiconductor laser 11 in the tricolor laser device, green light solid frequency double laser 12 and blue light half
Conductor laser 13 is successively arranged side by side to be placed on a platform, and the three primary colours are located at the rightmost of the platform.Because of this reality
Applying in example is by the light source unit 1, and beam collimation unit 3 and modulation display unit are arranged successively from right to left, can also incite somebody to action
This three big unit arrays from left to right.After placing the tricolor laser device, the red light semiconductor laser is opened
Device 11, green light solid frequency double laser 12 and blue semiconductor laser 13 generate rgb light source.Then, the RGB is adjusted
The optical power ratio of three-color light source matches the redgreenblue light source at white light.The present embodiment is by adjusting rgb light source
The white light generated after optical power ratio is the illumination white light of 6500K colour temperature.
It needs the White-Light processing after the illumination white light for generating 6500K colour temperature into corresponding white light beam.At this moment, it needs
A bundling optical fiber 2 is disposed in the left side of the tricolor laser device, and the bundling optical fiber 2 is set to the three primary colours
The light output path of laser, the bundling optical fiber 2 are the tail optical fiber of multicore beam, and 4 core of core Shu Kewei, 8 core, 12 core is differed to 96 cores.Its
In, optical fiber is a kind of fiber made of glass or plastics, can be used as light conduction tool.By the illumination of the 6500K colour temperature
White light can be coupled into white light beam after the bundling optical fiber 2, i.e., the bundling optical fiber 2 sends out the tricolor laser device
Laser synthesizing out is white light beam and exports.
For above-mentioned white light beam, we also need to be further processed, i.e., dispose in the left side of the bundling optical fiber 2
The beam collimation unit 3, and the horizontal transmission direction of the level height of the beam collimation unit 3 and the white light beam is same
On one straight line.The beam collimation unit 3 includes small filter 31, beam expanding lens 31 and polarizing film 33, and the white light beam is horizontal
It is radiated on the center i.e. aperture of filter of the small filter 31, because laser has the coherence of height, aerial ash
Dirt, optical element or laser itself often have some scattering light to will form interference, if but placing at the focusing of laser beam
As soon as small filter does not allow the light of other frequencies to pass through, the quality of the laser beam, the aperture in the present embodiment can be improved
Filter 31 is the zero-frequency composition that filter out the white light beam.
By the white light beam of zero-frequency part through being placed in the extender lens 32 in 31 left side of small filter expand for
Plane parallel light, the beam expanding lens 32 can be the convex lens group by the concavees lens and output that input at Galileo beam expanding lens,
The beam expanding lens that can be other types, the effect of the beam expanding lens 32 is exactly to increase the white light beam diameter, i.e., by the white light
Beam expander becomes plane parallel light.It should be noted that the white light beam wants horizontal irradiation at 32 center of beam expanding lens.
Then by the plane parallel light horizontal irradiation in the linear polarizer 33 for being placed in 32 left side of beam expanding lens
Center, which will become parallel linearly polarized light after beam expanding lens 32, the light vector of the parallel linearly polarized light
The track of endpoint is a straight line, and in the direction of propagation of light, and light vector is only vibrated along a fixed direction.
In summary, it needs small filter 31, beam expanding lens 32 and polarizing film 33 being successively set on the bundling optical fiber 2
Light output path on be just able to achieve expanding and polarizing to the white light beam.
After how understanding generates the parallel linearly polarized light, it is also necessary to understand the institute using the parallel linearly polarized light
State the workflow of modulation display unit.
Firstly, the modulation display unit includes the spatial light modulator for being loaded with the information of corresponding color hologram
4 and display screen 6, the workflow of the modulation display unit is as shown in figure 3, it illustrates a kind of colours provided in this embodiment
The display flow chart of steps of three- dimensional panoramic show system.
Step S21: the design parameter of hologram is determined according to the relevant parameter of spatial light modulator.
The present embodiment is to realize the three-dimensional colour picture that object to be shown is shown with a space intensity-scale device, so only needing
One width of corresponding design can reproduce the hologram of three-dimensional colour picture.Wherein, spatial light modulator includes multiple only
Vertical unit, they are spatially arranged in one-dimensional or two-dimensional array, and each unit can receive optical signalling and electrical signal
Control, is adjusted light wave and converts, so that the information of optics or electrical signal is loaded into light wave.So using
Spatial light modulator needs first to understand the relevant parameter of the spatial light modulator such as: resolution ratio, pixel, pixel separation, pixel
Accounting and the direction etc. that can be modulated.The spatial light modulator 4 used in the present embodiment is a phase type silicon substrate liquid
Brilliant optical spatial modulator, it is a kind of reflective spatial light modulator.The resolution ratio of the liquid crystal on silicon optical spatial modulator is
1980*1080pixels, Pixel Dimensions 8um.Then for loading the holography in the liquid crystal on silicon optical spatial modulator
Graph parameter is also it was determined that if resolution ratio is 1980*1080pixels, Pixel Dimensions 8um.
It should be noted that the spatial light modulator 4 includes the space that amplitude type, phase type and Amplitude & Phase have both type
Optical modulator, but the hologram as used in the embodiment of the present application is reproduce object dimensional color images to be shown pure
Phase type hologram, so using phase type spatial light modulator in the embodiment of the present application.Understanding described in the present embodiment
Behind the direction that can be modulated of spatial light modulator 4, need to allow describing parallel linearly polarized light and the spatial light modulator above
The polarization direction that can be modulated is identical.
After the parameter for determining the holographic graph parameter, need to carry out next step operation:
Step S22: three-dimensional scenic is encoded by phase type hologram according to the design parameter of determining hologram.
Because had determined in step S21 hologram to optical parameter, only need to confirm the holography in this step 22
Scheme the information to be included, such as the information of the hologram to be included is that a Zhang San ties up smiling face or a house etc., that
It just needs the hologram to be encoded into pure phase type hologram comprising the three-dimensional scenic of information.Because of the display in this implementation
Be reflective spatial light modulator in system, and hologram is phase hologram, it is advantageous to by the space light modulation
Device 4 is selected as phase type liquid crystal on silicon spatial light modulator.Color three dimension holographic display system described in the present embodiment further includes
The computer 5 being connected with the spatial light modulator 4, for generating and modulating the hologram.
After setting the hologram, next step S23 can be carried out.
Step S23: designed hologram is loaded into spatial light modulator using computer.
Designed hologram is loaded into the spatial light modulator 4, as employed in the embodiment of the present application
Color hologram, a width is the three-dimensional colour information that may include object to be shown, so only needing in the embodiment of the present application should
Phase type color hologram, which is loaded into the spatial light modulator 4, can carry out final step.
Step S24: spatial light modulator is modulated plane of linear polarization directional light and is imaged on screen.
Specific steps are as follows:
The computer 5 controls the spatial light modulator 4；
The spatial light modulator 4 is modulated the parallel linearly polarized light；
It is diffracted into after the parallel line polarisation is modulated on the screen 6, the three-dimensional colour that the hologram is presented reproduces
Picture.
It wherein, will be described above being formed after the light source unit 1 and beam collimation unit 3 with the space light modulation
Then the identical parallel linearly polarized light horizontal irradiation in the polarization direction that device 4 can be modulated passes through meter in the spatial modulator 4
Calculation machine 5 controls the spatial light modulator 4, i.e., above-mentioned designed hologram is loaded into spatial light modulator 4, specifically
The information of the hologram is loaded into the spatial light modulator 4 by ground, and the spatial light modulator 4 display is allowed to be pre-designed
The parallel linear polarization zero diopter is modulated after good hologram, the parallel lines polarizing diffraction through ovennodulation to the display screen
On curtain 6, the object reproduction image to be shown for including in the information of the hologram will be presented, i.e., with a LCOS type SLM
Reproduce the three-dimensional colour picture of hologram.
Although the application is disclosed as above with preferred embodiment, it is not for limiting the application, any this field skill
Art personnel are not departing from spirit and scope, can make possible variation and modification, therefore the guarantor of the application
Shield range should be subject to the range that the claim of this application defined.
Claims (8)
1. a kind of color holographic display system characterized by comprising light source unit, beam collimation unit and modulation display
Unit, in which:
The light source unit, for generating white light beam；
The beam collimation unit is parallel linearly polarized light for collimating and polarizing the white light beam；
The modulation display unit is presented for being modulated according to the information of corresponding hologram to the parallel linearly polarized light
The reproduction image of object to be shown in the information of the hologram；
The light source unit, beam collimation unit and modulation display unit are arranged to, the white light that the light source unit generates
Light beam is irradiated to the beam collimation unit, and after the beam collimation unit is collimated and polarized, and it is aobvious to be irradiated to the modulation
Show unit.
2. color holographic display system according to claim 1, which is characterized in that
The light source unit includes tricolor laser device and bundling optical fiber；
The bundling optical fiber is set to the light output path of the tricolor laser device, and the tricolor laser device is issued
Laser synthesizing is white light beam and exports.
3. color holographic display system according to claim 2, which is characterized in that
The beam collimation unit includes small filter, the beam expanding lens set gradually along the light output path of the bundling optical fiber
And polarizing film, in which:
The small filter is used to filter out the zero-frequency part of the white light beam；
The extender lens is for expanding the white light beam of the zero-frequency part for plane parallel light；
The polarizing film is for polarizing the plane parallel light for parallel line polarisation.
4. color holographic display system according to any one of claims 1 to 3, which is characterized in that
The modulation display unit includes spatial light modulator and display screen, in which:
The spatial light modulator is set to the outgoing route of the linearly polarized light of the beam collimation unit, described flat for receiving
Line polarised light, and adjusted according to the parallel linearly polarized light that the information of corresponding hologram exports the beam collimation unit
System, and by modulated light output to the display screen.
5. color holographic display system according to claim 4, which is characterized in that
The spatial light modulator is reflective spatial light modulator.
6. color holographic display system according to claim 4, which is characterized in that
The color holographic display system further includes the computer being connected with the spatial light modulator, described complete for generating
Breath figure, and the information of the hologram is loaded onto the spatial light modulator.
7. color holographic display system according to claim 4, which is characterized in that
The parallel linearly polarized light is identical as the polarization direction that the spatial light modulator can be modulated.
8. color holographic display system according to claim 4, which is characterized in that
The hologram is phase type hologram, and the spatial light modulator is phase type liquid crystal on silicon spatial light modulator.
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| CN201821318992.2U CN208903081U (en) | 2018-08-16 | 2018-08-16 | A kind of color holographic display system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270816A (en) * | 2018-08-16 | 2019-01-25 | 中国科学院光电研究院 | A kind of method for generating holograms and color holographic display system |
| CN114755905A (en) * | 2022-04-07 | 2022-07-15 | 浙江师范大学 | High-resolution true color image projection display system |
-
2018
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270816A (en) * | 2018-08-16 | 2019-01-25 | 中国科学院光电研究院 | A kind of method for generating holograms and color holographic display system |
| CN109270816B (en) * | 2018-08-16 | 2024-01-23 | 中国科学院光电研究院 | Hologram generating method and color holographic display system |
| CN114755905A (en) * | 2022-04-07 | 2022-07-15 | 浙江师范大学 | High-resolution true color image projection display system |
| CN114755905B (en) * | 2022-04-07 | 2023-11-07 | 浙江师范大学 | High-resolution true color image projection display system |
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