CN101881936A - Holographical wave guide display and generation method of holographical image thereof - Google Patents
Holographical wave guide display and generation method of holographical image thereof Download PDFInfo
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
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- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
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- G—PHYSICS
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Abstract
The invention belongs to an image display device and a method, relating to a holographical wave guide display taking a planar wave guide as a display screen and a generation method of a holographical image adaptive to the holographical wave guide display. The holographical wave guide display comprises a wave guide serving as the display screen and a holographcal projection system used for inputting the holographical image to the wave guide; the wave guide is provided with a light input panel and a light output panel; the incident light ray can be transmitted in the wave guide until leaving the wave guide from the light output panel; and the emergent position of the light ray on the light output panel is mutually determined by the position of point of incidence and the incidence angle of the light ray on the incidence panel. The holographical wave guide display of the invention can display the holographical image, can adopt the wave guide as a display carrier to manufacture the display which has jumbotron, low cost and environment protection and is energy-saving, sturdy and durable.
Description
Technical field
The invention belongs to image display device and method, relating to a kind of is the generation method of the holographical wave guide display of display screen and the hologram image that adapts with this holographical wave guide display with the slab guide.
Background technology
Holography be a kind of with image transitions for its diffraction pattern at a certain specific range, and use the technology of one or more monochromatic sources irradiation diffraction patterns.After the process propagation of specific range, because diffraction of light and interference effect, this diffraction pattern can be reduced into former target image.Compare and common projection and lcd technology, line holographic projections has the following advantages:
1. energy-conservation: different with the unwanted light of LCD shielding, holographic modulation and the direct light of showing, the luminous energy of all incidents all will be used effectively in theory.The efficiency of light energy utilization of liquid crystal display is between 10-20% according to statistics, and the holography of adopting binary phase modulation technique (binary-phase modulation) shows the efficiency of light energy utilization more than 40%, and polynary phase modulation technique (multi-phase modulation) can be brought up to the efficiency of light energy utilization more than 90%.In addition, compare the employed white light bulb of traditional shadow casting technique, employed LASER Light Source of line holographic projections or photodiode light source have very high energy conversion efficiency.
2. volume is little, and is simple in structure: than conventional projector, the aberration of display image can be corrected by computed hologram itself, has saved the bulky complex that is provided with and the expensive lens combination that differ for rectification thus.In addition, for coloured image, the line holographic projections instrument uses three kinds of monochromatic sources of red green basket, and it is easy that its chromatic aberration correction also comprises the common projection of white light of all spectrum more than use.
3. stability is high: traditional display technique display image and projection chip or indicator screen and show image are point-to-point corresponding relation, if on chip or the screen a bad point is arranged, then show image just produces a bad point.And line holographic projections spatial light modulator (Spatial Light Modulator, what SLM) go up to show is hologram through specific calculations, its ultimate principle has guaranteed will produce bad point never on the screen.Certain spectrum information on the corresponding screen picture of picture element of hologram image but not particular pixels point, the hypothesis space photomodulator is distinguished as 1000x1000, amount to 1,000,000 picture elements, then 1 bad point is changed to 1/1000000th and do not have a corresponding bad point to what display image caused on it, naked eyes can't be discovered at all, even hundreds of bad points are arranged on the spatial light modulator, its influence to display image only is several per milles also, and naked eyes are difficult for discovering.
In patent CN1217539C, reported a kind of tapered transmission line display of using conventional projector, its advantage is to save the required light path of conventional projection, its thickness is than next thin of traditional rear projection display, and can compare favourably with flat-panel monitors such as liquid crystal plasmas.Because waveguide can be compared and liquid crystal by cheap optical glass or transparent plastic sheet manufacturing, classic flat-plate display techniques such as plasma, when making the large scale screen, its cost will be very cheap.Because waveguide itself does not contain any electronic devices and components, compare liquid crystal in addition, plasma, displays such as photodiode, Waveguide display are more firm, and be durable in use.But existing this Waveguide display uses conventional projection, and for correction differs aberration, the structure of waveguide is comparatively complicated and be difficult for making.Volume that conventional in addition projector is huge and complicated lens system have also limited its application on waveguide shows.
Summary of the invention
Technical matters to be solved by this invention is, but a kind of display holography image is provided, can adopt simultaneously waveguide as show carrier, can manufacture jumbotron, the generation method of with low cost, energy-conserving and environment-protective, robust holographical wave guide display and the hologram image that adapts with this holographical wave guide display.
Holographical wave guide display of the present invention comprises one as the waveguide of display screen be used for holographic projection system to waveguide input hologram image; Described waveguide has optical input surface and light output plane, and incident ray can be propagated until it in waveguide and leave waveguide from the light output plane, and the outgoing position of light on the light output plane determined jointly by its incidence point position and incident angle on the plane of incidence.
The side original shape of described waveguide is a triangular form, and the front end drift angle is α, and for economical with materials can make it to become wedge shape with the excision of front end nonuseable part, its rear end is the optical input surface that and positive light output plane become the β angle.
Preceding half section of described waveguide is the viewing area, and the second half section is the image diffusion zone, and the image diffusion zone is foldable to the back side, viewing area to save space hold.
Described holographic projection system includes light source, be used for light source is carried out phase place or intensity modulated and exports the modulation of source module of required image.
The light source that described holographic projection system also includes between light source and modulation of source module importation expands the beam alignment module.
Described holographic projection system also can include the image amplification correction module that is positioned at modulation of source module output.
Described holographic projection system also includes a control module, the switch and the output of control module control light source are strong and weak, when the modulation of source module is convertible on it during the device of show image, then control module can accept to import image, and export hologram image accordingly, and make itself and light source export synchronised to the modulation of source module.
Described control module also can include and be used for common image is converted to synchronously the hologram image generation module of hologram image.When control module comprised the hologram image generation module, it can receive common image, was converted to hologram image again; When control module did not comprise the hologram image generation module, it can directly receive the hologram image that is generated by external system.
The hologram image generation method that is adapted to above-mentioned wedge-shaped waveguide of the present invention operates in above-mentioned the hologram image generation module or external system, and described hologram image generation module or external system can be single-chip microcomputer, digit chip (DSP), field programmable gate array electronic chip or computers such as (FPGA).
The hologram image generation method that is adapted to above-mentioned wedge-shaped waveguide of the present invention comprises a waveguide inverse transformation, and the waveguide inverse transformation may further comprise the steps:
(1) image to required demonstration adds phase factor;
(2) light according to different angles is divided into one or more zones in the principle of zones of different outgoing with full screen;
(3) image of corresponding region is done Fourier transform or inverse fourier transform, get result's corresponding wave band, obtain its angular spectrum;
(4) the contrary A as a result that propagates (3)
n(f
x, f
y), the angular spectrum after the propagation
K=λ/2 π wherein, λ is the incident light wavelength;
(5) with A
n' (f
x, f
x) retrograde rotation pi/2-2n α; (because hologram image to the anglec of rotation and insensitive, need not rotate the picture quality that also can obtain than satisfied under the situation mostly, so this step can be omitted also)
(6) calculate and compensate because the influence that air waveguide interface and lens combination cause;
(7) with all angular spectrum stacks, do inverse fourier transform or Fourier transform again, obtain the amplitude and the PHASE DISTRIBUTION in space.
In the step of above-mentioned waveguide inverse transformation, the order of step (1) with step (2) can be exchanged mutually.
In the step of above-mentioned waveguide inverse transformation, step (6)～(7) can also be replaced by the following step:
A. calculate and compensate the influence that cause at different interfaces;
B. with all angular spectrum stacks, do inverse fourier transform or Fourier transform again, obtain the amplitude and the PHASE DISTRIBUTION in space;
C. calculate and influence that the offset lens system causes.
In order to improve the display quality of image, hologram image generation method of the present invention can also be: at first input picture is calculated hologram by the waveguide inverse transformation, with its quantification, quantize amplitude and the phase place of back hologram by the waveguide transformation calculations again at the light output plane, get its phase place, and join original input image; Recomputate hologram again; Repeat above step, after satisfying the number of times of setting, export the hologram that obtains to the modulation of source module again; Described waveguide conversion may further comprise the steps:
(1) hologram image is done inverse fourier transform or Fourier transform obtains its angular spectrum, and be divided into one or more wave bands, obtain each wave band angular spectrum;
(2) calculate and the influence that causes at offset lens and different interface;
(3) result who obtains in (2) is rotated pi/2-2n α; (because hologram image to the anglec of rotation and insensitive, need not rotate the picture quality that also can obtain than satisfied under the situation mostly, so this step can be omitted also)
(4) A as a result of propagation (3)
n(f
x, f
y), the angular spectrum after the propagation
K=λ/2 π wherein, λ is the incident light wavelength;
(5) each wave band is done Fourier transform or Fourier transform respectively, and only get the amplitude and the PHASE DISTRIBUTION of its corresponding region;
(6) each regional amplitude and PHASE DISTRIBUTION stack are obtained total amplitude and PHASE DISTRIBUTION.
In the step of above-mentioned waveguide conversion, step (1)～(2) can be replaced by the following step:
A. calculate and influence that the offset lens system causes;
B. hologram image is done inverse fourier transform or Fourier transform obtains its angular spectrum, and be divided into one or more wave bands, obtain each wave band angular spectrum;
C. calculate and compensate the influence that cause at different interfaces.
In the step of above-mentioned waveguide conversion, the order of step (3) and (4) can be exchanged.
In order further to improve the display quality of image, hologram image generation method of the present invention can also be to the above-mentioned hologram image of modulation of source module that exports to by showing multiframe nuance image at short notice fast, utilize the human eye vision residual effect, make its superimposed error that reduces on retina, its concrete steps are as follows:
(1) determines that every frame display image how many frame subimages is made of, and counts M;
(2) input picture is added phase factor, the desirable phase place immediately of the initial phase factor.Determine that each sub-frame images needs number of iterations N;
(3) carry out the waveguide inverse transformation, obtain required hologram;
(4) according to institute's usage space optical modulation device hologram is quantized, obtain the quantification hologram that can show thereon;
(5) judge whether to reach iterations,, obtain quantizing the amplitude and the PHASE DISTRIBUTION of the display image of hologram correspondence, get its phase place, be added to original input image if operating procedure (6) then then moves the waveguide conversion if not, and rebound step (3);
(6) will quantize hologram is that a subframe is presented on the modulation of source module;
(7) judge whether to finish the demonstration of these all subframes of image, if then import the next frame image, rebound step (1); Then move the waveguide conversion if not, the amplitude of gained image and the amplitude of original input image are compared, the intensity of original input image is made amendment, rebound step again (2) according to the gained error.
Holographical wave guide display of the present invention is compared and general projectors, and it is little to have a volume, and cost is low, energy-conserving and environment-protective, stable advantage such as not fragile.Compare common line holographic projections technology, the present invention combines with the waveguide demonstration, makes product have screen, has saved the required optical path space of projector, and has been as good as with the ordinary flat display in profile and use.Combining with waveguide in addition to make product have the touch-screen of being transformed into, transparent display, the following space of using of three dimensional display or the like.
Description of drawings
Fig. 1 is the structural representation that has shown the holographical wave guide display embodiment of the present invention of waveguide side structure;
Fig. 2 is the plan structure synoptic diagram of Fig. 1;
Fig. 3 is the structural representation that has shown another embodiment of holographical wave guide display of the present invention of waveguide side structure;
Fig. 4 is the plan structure synoptic diagram of Fig. 3;
Fig. 5 is the holographic projection system schematic diagram of one embodiment of the invention;
Fig. 6 is the holographic projection system schematic diagram of another embodiment of the present invention;
Fig. 7 is a kind of enforceable index path of schematic diagram shown in Figure 6;
Fig. 8 is the hologram image generating principle figure of wedge-shaped waveguide;
Fig. 9 is the process flow diagram of waveguide inverse transformation;
Figure 10 is the process flow diagram of waveguide conversion;
Figure 11 is a kind of schematic diagram that reduces the method for hologram image error.
Embodiment
As shown in Figure 1, 2, the holographical wave guide display of the embodiment of the invention comprises a waveguide 11 and the holographic projection system 12 that is used for to waveguide input hologram image as display screen.The shape of waveguide can be as shown in Figure 1, and the side original shape is a triangular form, and its front end drift angle is α, for economical with materials can be excised the front end nonuseable part, make it to become wedge shape, for ease of light incident, the waveguide rear end can be designed to a plane that becomes the β angle with exit facet after as calculated.Its vertical view can be rectangle, triangle, or other shape of being convenient to show.It is latter half of as image diffusion zone 111 (light transmitting region territory), and first half is used for show image as viewing area 112.Thereby space (as Fig. 3, Fig. 4) is saved at the wherein latter half of first half back side that also is collapsible into), Waveguide display shape and ordinary flat display are as good as, one bed interface is wherein arranged between image diffusion zone and the screen, can be air or special media, on this interface, only reflect and not outgoing to guarantee light.Can plate one deck anti-reflection film (anti-reflection film) in screen surface, reach all outgoing behind the shooting angle, eliminate the influence that image is caused because of secondary reflection to guarantee light.
As Fig. 5, shown in Figure 6, holographic projection system comprises following part:
Light source: light source adopts monochromatic source, for example laser or photodiode.Red by using, green, three kinds of monochromatic sources of basket can obtain coloured image.
Light source expands beam alignment module and image amplification correction module: they are used for amplifying and proofreading and correct with laser beam expanding and correction and to the image output of modulation of source module.Can be that directional light is used for the irradiates light modulation module for example, and use lens combination to amplify the hologram of output expanding Light source correction behind the bundle.
The modulation of source module: this module is used for light source is carried out phase place or intensity modulated and exports required image.It can adopt liquid crystal over silicon System on Chip/SoC (LCOS), digital micromirror elements (DMD), or hologram, grating array etc.If adopt liquid crystal over silicon System on Chip/SoC (LCOS), digital micromirror elements devices such as (DMD), then the hologram that shows on it can carry out the high speed switching by control module, thereby realizes the output of dynamic video stream.
Control module: control module is used to control the switch and the output power of light source, and it can be by single-chip microcomputer, digit chip (DSP), and field programmable gate array electronic chips such as (FPGA) and circuit constitute.If the spatial light modulation module adopts liquid crystal over silicon System on Chip/SoC (LCOS), digital micromirror elements (DMD) etc. can realize the device of conversion show image on it, then control module will be accepted the input image, and export hologram accordingly to the spatial light modulation module, and make itself and light source export synchronised.In addition, if be input as common image, then control module will comprise the hologram generation module, realize that ordinary video to the conversion synchronously in real time of hologram, exports the hologram that generates to the spatial light modulation module again, and keep light source and its (as Fig. 5) synchronously.As if the hologram that is input as of control module, then this module can not contain the hologram modular converter.Control module directly will be imported hologram and output to the spatial light modulation module, and make the strong and weak and corresponding image of light source keep (as Fig. 6) synchronously, and ordinary video flow to the transfer process of hologram video flowing and can be finished by the computing machine of outside.
Figure 7 shows that a kind of feasible specific implementation light path of schematic diagram shown in Figure 5.Wherein light source uses red, green, three kinds of one-wavelength lasers of basket, and light source expands beam alignment and image amplification correction module is made of lens 1～lens 5. Lens 1,2,3 are the Light source correction lens, make respective sources be converted to plane wave by nonplanar wave.Lens 4,5 constitute reverse telescope configuration, are used to amplify the hologram of modulation of source module output.Can realize phase modulation (PM) behind spatial light modulation module use liquid crystal over silicon System on Chip/SoC (LCOS) the adding polaroid to light.Control module is used digit chip (DSP) or field programmable gate array (FPGA), and the common image that realization will be imported is converted to the function of hologram image in real time synchronously, and the output of synchronous light source and hologram image.
Can have multiple light path to realize the principle of Fig. 5 or 6, Fig. 7 only is a kind of scheme wherein.Fig. 5 or 6 principle also can dispose a modulation of source device by the laser of every kind of color and realize, for example contain 3 liquid crystal over silicon System on Chip/SoCs (LCOS) in the total system thus modulated red, green, three kinds of light sources of basket improve picture quality respectively.
The propagation of light in waveguide is different from the circulation way in the free space.Therefore the hologram in the waveguide generate also will distinguish and free space in the generation method.The waveguide of wedge structure of the present invention, the incident light of different angles can be become to be projected on the exit plane of different rotation angle by equivalence.Fig. 8 is the side view of wedge-shaped waveguide, and there is plated film on its surface, and the waveguide drift angle is α, and height is H, and long is L.Light enters that incident angle is θ after the waveguide, and as calculated, angle belongs to (θ
In, θ
In+ 2 α] the projection of light can be equivalent on the waveguide surface that is projected in behind the rotation 2m α, and angle belongs to (θ
In-2 α, θ
In] light be equivalent to and be projected on the waveguide surface of rotation behind 2 (m+1) α.
Fig. 9 is a kind of method that generates the waveguide hologram image, is called the waveguide inverse transformation among the present invention.Its step is as follows:
To the image T of required demonstration (x, y) add phase factor T (x, y) * e
J Φ (x, y), (x y) can be random phase to initial phase factor Φ;
2. the light according to different angles is divided into N zone (interregional overlapping, promptly the incident light of different angles is because of the different same point outgoing on screen of incidence point), N wave band T on the corresponding angles frequency spectrum respectively in the principle of zones of different outgoing with full screen
n(x, y)=T (x, y) * e
J Φ (x, y)* P
n(x, y), wherein
Play the spatial filter effect, R
nScreen area for correspondence;
3. the image of regional n is done Fourier transform or inverse fourier transform, and only get result's n wave band, obtain its angular spectrum, A
n(f
x, f
y)=F{T
n(x, y) } * Q
n(f
x, f
y), wherein F{} wherein is Fourier or inverse fourier transform,
Play the angular spectrum wave filter, S
nWave band for correspondence;
4. the contrary A that propagates
n(f
x, f
y).Angular spectrum after the propagation
K=λ/2 π wherein, λ is the incident light wavelength;
5. calculate A
n' (f
x, f
x) result's (if the anglec of rotation is little, this step also can be omitted) behind retrograde rotation pi/2-2n α;
6. calculating and compensation are empty because the influence that air waveguide interface and lens combination cause;
7. with all angular spectrum stacks, do inverse fourier transform or Fourier transform again, obtain the amplitude and the PHASE DISTRIBUTION in space.
The order of step can adjust in the method, to adapt to different system.Selecting range or phase place quantizes to generate hologram according to employed spatial light modulator in the lump at last, for example, spatial light modulator for the binary phase modulation, a kind of quantization method is to take to make all phase places to get pi/2 greater than 0 point, point less than 0 is got-pi/2, thereby obtains a binary hologram.
Step 3,4,6 can be expressed as on mathematics
Wherein * is a convolution algorithm, because
Irrelevant with concrete image, so but calculated in advance and storage, thus can use a convolutional calculation to replace Fourier transform twice, thus improve arithmetic speed.
Said method is reversible in addition, only need revise slightly, just can get the waveguide conversion (Figure 10) of computed hologram at screen display:
(1) hologram is done inverse fourier transform or Fourier transform obtains its angular spectrum, and be divided into one or more wave bands, obtain each wave band angular spectrum;
(2) calculate and the influence that causes at offset lens and different interface;
(3) result who obtains in (2) is rotated pi/2-2n α (if the anglec of rotation is little, this step also can be omitted);
(4) A as a result of propagation (3)
n(f
x, f
y), get angular spectrum
K=λ/2 π wherein, λ is the incident light wavelength;
(5) each wave band is done Fourier transform or Fourier transform respectively, and only get the amplitude and the PHASE DISTRIBUTION of its corresponding region;
(6) each regional amplitude and PHASE DISTRIBUTION stack are obtained total amplitude and PHASE DISTRIBUTION.
The order of above-mentioned steps can according to circumstances be adjusted.
Quantizing process will produce error, be to improve picture quality, can utilize the high refresh rate of the persistence of vision effect of human eye and Cyberspace photomodulator to realize that the quick demonstration of image reduces owing to hologram quantizes the error that causes on the Cyberspace photomodulator.For example, the liquid crystal over silicon System on Chip/SoC (LCOS) that refresh rate is 1024 hertz of per seconds, per second can show 1024 two field pictures, by one second 24 two field picture note of ordinary video, then every two field picture can be made up of 42 frame subimages, exist nuance with remedying error to each other between subimage, because the persistence of vision effect of human eye, the image that observes at last will have very high quality.(introduced a kind of aberration correction method of two-dimension holographic projection in free space among the patented claim CN101310225A.Among the present invention employed difference correction based on the waveguide conversion but not simple Fourier transform is obviously different with its existence), waveguide hologram of the present invention bearing calibration such as Figure 11:
1. import a frame new images, determine that it how many frame subimages is made of, and counts M
2. input picture is added phase factor, the desirable phase place immediately of the initial phase factor.Determine to calculate each sub-frame images and need number of iterations N.
3. carry out the waveguide inverse transformation, obtain required hologram
4. carry out hologram according to the spatial light modulation device and quantize, obtain the quantification hologram that can show thereon
5. judge whether to reach iterations, if operating procedure 6 then then moves the waveguide conversion if not, obtain quantizing hologram the amplitude and the PHASE DISTRIBUTION of corresponding display image, get PHASE DISTRIBUTION, be added to input picture in 2, and rebound step 3
6. will quantize hologram is that a subframe is presented on the spatial light modulator
7. judge whether to finish the demonstration of these all subframes of image, if then import the next frame image, rebound step 1.Then move the waveguide conversion if not, the amplitude of gained image and the amplitude of original input image are compared, by specific process the intensity of original input image is carried out trickle modification according to the gained error, again rebound step 2.
Claims (17)
1. holographical wave guide display is characterized in that: it comprises a waveguide as display screen (11) and is used for holographic projection system (12) to waveguide input hologram image; Described waveguide has optical input surface and light output plane, and incident ray can be propagated until it in waveguide and leave waveguide from the light output plane, and the outgoing position of light on the light output plane determined jointly by its incidence point position and incident angle on the plane of incidence.
2. holographical wave guide display according to claim 1 is characterized in that: the side view of described waveguide is a wedge shape, and its rear end is an optical input surface, and the front is the light output plane.
3. holographical wave guide display according to claim 2 is characterized in that: preceding half section according to described waveguide is viewing area (112), and the second half section is image diffusion zone (111), and the image diffusion zone is folded to the back side, viewing area.
4. according to the described holographical wave guide display of one of claim 1～3, it is characterized in that: described holographic projection system includes light source, be used for light source is carried out phase place or intensity modulated and exports the modulation of source module of required image.
5. holographical wave guide display according to claim 4 is characterized in that: the light source that described holographic projection system includes between light source and modulation of source module importation expands the beam alignment module.
6. holographical wave guide display according to claim 4 is characterized in that: described holographic projection system includes the image amplification correction module that is positioned at modulation of source module output.
7. holographical wave guide display according to claim 4, it is characterized in that: described holographic projection system also includes a control module, the switch and the output of control module control light source are strong and weak, when the modulation of source module is convertible on it during the device of show image, then control module can accept to import image, and export hologram image accordingly, and make itself and light source export synchronised to the modulation of source module.
8. holographical wave guide display according to claim 7 is characterized in that: described control module includes and is used for common image is converted to synchronously the hologram image generation module of hologram image.
9. hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays, it is characterized in that: it comprises a waveguide inverse transformation, and the waveguide inverse transformation may further comprise the steps:
(1) image to required demonstration adds phase factor;
(2) light according to different angles is divided into one or more zones in the principle of zones of different outgoing with full screen;
(3) image of corresponding region is done Fourier transform or inverse fourier transform, get result's corresponding wave band, obtain its angular spectrum;
(4) the contrary A as a result that propagates (3)
n(f
x, f
y), the angular spectrum after the propagation
K=λ/2 π wherein, λ is the incident light wavelength;
(5) with A
n' (f
x, f
x) retrograde rotation pi/2-2n α;
(6) calculate and compensate because the influence that air waveguide interface and lens combination cause;
(7) with all angular spectrum stacks, do inverse fourier transform or Fourier transform again, obtain the amplitude and the PHASE DISTRIBUTION in space.
10. the hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays according to claim 9 is characterized in that: described waveguide inverse transformation is in its step described step (5) to be omitted.
11. the hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays according to claim 9 is characterized in that: described waveguide inverse transformation is in its step the order of step (1) with step (2) to be exchanged mutually.
12. the hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays according to claim 9 is characterized in that: described waveguide inverse transformation is in its step step (6)～(7) to be replaced by the following step:
A. calculate and compensate the influence that cause at different interfaces;
B. with all angular spectrum stacks, do inverse fourier transform or Fourier transform again, obtain the amplitude and the PHASE DISTRIBUTION in space;
C. calculate and influence that the offset lens system causes.
13. hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays, it is characterized in that: at first input picture is calculated hologram according to the described waveguide inverse transformation of one of claim 9～12, with its quantification, quantize amplitude and the phase place of back hologram by the waveguide transformation calculations again at the light output plane, get its phase place, and join original input image; Recomputate hologram again; Repeat above step, after satisfying the number of times of setting, export the hologram that obtains to the modulation of source module again;
Described waveguide conversion may further comprise the steps:
(1) hologram image is done inverse fourier transform or Fourier transform obtains its angular spectrum, and be divided into one or more wave bands, obtain each wave band angular spectrum;
(2) calculate and the influence that causes at offset lens and different interface;
(3) result who obtains in (2) is rotated pi/2-2n α;
(4) A as a result of propagation (3)
n(f
x, f
y), the angular spectrum after the propagation
K=λ/2 π wherein, λ is the incident light wavelength;
(5) each wave band is done Fourier transform or Fourier transform respectively, and only get the amplitude and the PHASE DISTRIBUTION of its corresponding region;
(6) each regional amplitude and PHASE DISTRIBUTION stack are obtained total amplitude and PHASE DISTRIBUTION.
14. the hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays according to claim 13 is characterized in that: described waveguide conversion is in its step step (3) to be omitted.
15. the hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays according to claim 13 is characterized in that: described waveguide conversion is in its step step (1)～(2) to be replaced by the following step:
A. calculate and influence that the offset lens system causes;
B. hologram image is done inverse fourier transform or Fourier transform obtains its angular spectrum, and be divided into one or more wave bands, obtain each wave band angular spectrum;
C. calculate and compensate the influence that cause at different interfaces.
16. the hologram image generation method that is adapted to claim 2 or 3 described Waveguide displays according to claim 13 is characterized in that: described waveguide conversion is in its step the order of step (3) and (4) to be exchanged.
17., it is characterized in that:, carry out the processing of following steps to exporting the hologram image of modulation of source module to according to the described hologram image of one of claim 13～16 generation method:
(1) determines that every frame display image how many frame subimages is made of, and counts M;
(2) input picture is added phase factor, the desirable phase place immediately of the initial phase factor.Determine that each sub-frame images needs number of iterations N;
(3) carry out the waveguide inverse transformation, obtain required hologram;
(4) according to institute's usage space optical modulation device hologram is quantized, obtain the quantification hologram that can show thereon;
(5) judge whether to reach iterations,, obtain quantizing the amplitude and the PHASE DISTRIBUTION of the display image of hologram correspondence, get its phase place, be added to original input image if operating procedure (6) then then moves the waveguide conversion if not, and rebound step (3);
(6) will quantize hologram is that a subframe is presented on the modulation of source module;
(7) judge whether to finish the demonstration of these all subframes of image, if then import the next frame image, rebound step (1); Then move the waveguide conversion if not, the amplitude of gained image and the amplitude of original input image are compared, the intensity of original input image is made amendment, rebound step again (2) according to the gained error.
Priority Applications (2)
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| CN 201010191189 CN101881936B (en) | 2010-06-04 | 2010-06-04 | Holographical wave guide display and generation method of holographical image thereof |
| PCT/CN2011/075268 WO2011150863A1 (en) | 2010-06-04 | 2011-06-03 | Holographic wave guide display and generation method of holographic image thereof |
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|---|---|---|---|
| CN 201010191189 CN101881936B (en) | 2010-06-04 | 2010-06-04 | Holographical wave guide display and generation method of holographical image thereof |
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| CN101881936A true CN101881936A (en) | 2010-11-10 |
| CN101881936B CN101881936B (en) | 2013-12-25 |
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