CN107422623B - Color holographic zoom system based on liquid lens - Google Patents
Color holographic zoom system based on liquid lens Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 121
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims description 42
- 230000000694 effects Effects 0.000 claims description 10
- 230000004075 alteration Effects 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/10—Processes or apparatus for producing holograms using modulated reference beam
- G03H1/12—Spatial modulation, e.g. ghost imaging
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2249—Holobject properties
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
- G03H2001/221—Element having optical power, e.g. field lens
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
- G03H2001/2213—Diffusing screen revealing the real holobject, e.g. container filed with gel to reveal the 3D holobject
- G03H2001/2215—Plane screen
- G03H2001/2218—Plane screen being perpendicular to optical axis
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2249—Holobject properties
- G03H2001/2263—Multicoloured holobject
- G03H2001/2271—RGB holobject
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
- G03H2001/266—Wavelength multiplexing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2210/00—Object characteristics
- G03H2210/20—2D object
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2222/00—Light sources or light beam properties
- G03H2222/10—Spectral composition
- G03H2222/17—White light
- G03H2222/18—RGB trichrome light
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Abstract
The invention relates to a color holographic zoom system based on a liquid lens. The invention aims to solve the technical problems of complex structure, difficult operation and poor quality of reproduced images of the existing holographic 3D zoom system. The technical scheme adopted by the invention is as follows: a color holographic zoom system based on a liquid lens comprises a three-color light source, a beam splitter prism, a spatial light modulator, a computer, the liquid lens, a receiving screen and a synchronous control circuit; the three-color light source is arranged on an incident light path of the light splitting prism, the spatial light modulator is arranged on a reflected light path of the light splitting prism, the liquid lens is arranged behind the spatial light modulator, and the receiving screen is arranged behind the liquid lens; the three-color light source respectively irradiates the spatial light modulator after passing through the beam splitter prism, and the light source controlled by the spatial light modulator is projected to a receiving screen through zooming of the liquid lens; the synchronous control circuit ensures that the switching time of the light source, the hologram and the liquid lens is consistent.
Description
Technical Field
The invention relates to a color holographic zoom system based on a liquid lens, and belongs to the technical field of holographic display.
Background
Three-dimensional (3D) display has appeared since the last 80 th century in various ways such as glasses type 3D display, multi-viewpoint 3D display, holographic 3D display, and the like. Wherein the holographic 3D display is capable of fully recording and reconstructing the wavefront of a 3D object, providing all the depth information required by the human visual system, and thus is internationally and widely considered as the ultimate target of 3D display. In order to adjust the size of the reproduced image, a conventional method is to change the size of the reproduced image by mechanically moving the position of a lens or the relative position between lens groups to change the position of the reproduced image. Systems of this method are generally complex and difficult to operate, and are more difficult to operate if color holographic reconstruction is desired. Some authors propose to use scaled fresnel diffraction to achieve lensless holographic scaled projection. The zooming effect is realized by calculating different sampling rates on the projection image and the holographic surface. However, as the sampling rate changes, the quality of the reproduced image may also be affected. When the sampling rate exceeds a certain range, the reproduced image may even be distorted.
Disclosure of Invention
The invention aims to solve the technical problems of complex structure, difficult operation and poor quality of reproduced images of the conventional holographic 3D zoom system and provides a color holographic zoom system based on a liquid lens.
In order to solve the technical problems, the invention adopts the technical scheme that:
a color holographic zoom system based on a liquid lens comprises a collimated red light source, a collimated green light source, a collimated blue light source, a beam splitter prism, a spatial light modulator, a computer, a liquid lens, a receiving screen and a synchronous control circuit; the collimating red light source, the collimating green light source and the collimating blue light source are arranged on an incident light path of the beam splitter prism, the spatial light modulator is arranged on a reflection light path of the beam splitter prism, the liquid lens is arranged behind the spatial light modulator, and the receiving screen is arranged behind the liquid lens; the signal output end of the spatial light modulator is connected with the signal input end of a computer, the signal input end of the synchronous control circuit is connected with the signal output end of the liquid lens, the signal output end of the synchronous control circuit is connected with the signal input end of the computer, and the control end of the synchronous control circuit is connected with the control ends of the collimated red light source, the collimated green light source and the collimated blue light source; the collimated red light source, the collimated green light source and the collimated blue light source respectively irradiate the spatial light modulator after passing through the beam splitter prism, and the light source controlled by the spatial light modulator is projected to a receiving screen through zooming of the liquid lens; the synchronous control circuit ensures that the switching time of the light source, the hologram and the liquid lens is consistent.
Further, the liquid lens is composed of a transparent hard cavity, an upper substrate, a lower substrate, a middle substrate, transparent conductive liquid, a dielectric layer and an ITO electrode layer, wherein the ITO electrode layer and the dielectric layer are sequentially plated on the middle substrate; transparent non-conductive liquid which is not mutually soluble is filled around the transparent conductive liquid; the center of the middle substrate is provided with a round hole, a plurality of small holes are uniformly distributed around the middle substrate to serve as channels for the circulation of transparent conductive liquid, the lower substrate is arranged at the bottom of the transparent hard cavity, the transparent conductive liquid is positioned on the upper surface of the lower substrate, the middle substrate plated with an ITO electrode layer and a dielectric layer is arranged on the transparent conductive liquid, and the upper substrate is arranged on the top surface of the transparent hard cavity; in an initial state, two kinds of filled liquid form a convex surface at a liquid-liquid interface, and at the moment, after a light beam passes through a liquid lens, the light beam is converged, namely the function of the positive lens; after voltage is applied between the ITO electrode layer and the transparent conductive liquid, the conductive liquid can gush out through the small hole of the middle substrate due to the left and right electrowetting effect, the conductive liquid in the central round hole can be pumped away, so that the liquid-liquid interface is a concave surface at the moment, and at the moment, the light beam is diverged after passing through the liquid lens, namely, the function of the negative lens is realized.
Further, the length D of the transparent hard cavity1Not less than 10mm and D1Not more than 12mm, width D2＝D1High D3Not less than 8mm and D3Less than or equal to 10 mm; diameter D of central circular hole of intermediate substrate4Not less than 5mm and D4Less than or equal to 6 mm; peripheral orifice diameter D5Not less than 1mm and D5Less than or equal to 2mm and thickness D6Not less than 2mm and D6≤3mm。
Further, the distance between the light source and the spatial light modulator is d1The distance between the spatial light modulator and the liquid lens is d2The distance between the receiving screen and the liquid lens is d3，f1Is the focal length of the digital lens loaded onto the spatial light modulator, f2Is the focal length of the liquid lens; when the element position of the system is kept unchanged, the zooming of the reproduced image can be realized by changing the focal lengths of the digital lens and the liquid lens; position of reproduced image satisfiesThe size of the reproduced image is
In the formula: λ is the wavelength, p is the pixel size of the spatial light modulator; the size relationship of the three color reproduction images is as follows:
in the formula: hr, Hg and Hb are sizes of three color reproduction images of red, green and blue, f1r、f1gAnd f1bIs the focal length, λ, of a digital lens loaded onto the three color holograms, respectivelyr、λgAnd λbRespectively, the wavelengths of the corresponding colors, and the focal lengths of the digital lenses loaded on the three color holograms are required to satisfy the requirement of compensating the chromatic aberration caused by the wavelengths
The invention has the beneficial effects that: the liquid lens is used for matching with the digital lens to adjust the size of the reproduced image, so that the high-quality zooming effect is realized, and the technical problems of complex structure, difficult operation and poor quality of the reproduced image of the conventional holographic 3D zooming system are solved. Compared with the background technology, the invention has the advantages of simple structure, convenient operation, good quality of reproduced image and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a zoom schematic of the present invention;
fig. 3 is a schematic diagram of an electrowetting-driven liquid lens structure.
In the figure: 1-collimation red light source, 2-collimation green light source, 3-collimation blue light source, 4-beam splitter prism, 5-spatial light modulator, 6-computer, 7-liquid lens, 8-receiving screen, 9-synchronous control circuit, 10-transparent hard cavity, 11-upper substrate, 12-lower substrate, 13-middle substrate, 14-transparent conductive liquid, 15-dielectric layer and 16-ITO electrode layer.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, the color holographic zoom system based on liquid lens in this embodiment includes a collimated red light source 1, a collimated green light source 2, a collimated blue light source 3, a beam splitter prism 4, a Spatial Light Modulator (SLM)5, a computer 6, a liquid lens 7, a receiving screen 8 and a synchronization control circuit 9; the collimation red light source 1, the collimation green light source 2 and the collimation blue light source 3 are arranged on an incident light path of the beam splitter prism 4, the spatial light modulator 5 is arranged on a reflected light path of the beam splitter prism 4, the liquid lens 7 is arranged behind the spatial light modulator 5, and the receiving screen 8 is arranged behind the liquid lens 7; the signal output end of the spatial light modulator 5 is connected with the signal input end of the computer 6, the signal input end of the synchronous control circuit 9 is connected with the signal output end of the liquid lens 7, the signal output end of the synchronous control circuit 9 is connected with the signal input end of the computer 6, and the control end of the synchronous control circuit 9 is connected with the control ends of the collimated red light source 1, the collimated green light source 2 and the collimated blue light source 3; the collimated red light source 1, the collimated green light source 2 and the collimated blue light source 3 respectively irradiate on the spatial light modulator 5 after passing through the beam splitter prism 4, and the light sources controlled by the spatial light modulator 5 are projected to a receiving screen 8 through zooming of the liquid lens 7; the synchronization control circuit 9 ensures that the switching times of the light source, the hologram and the liquid lens are consistent.
As shown in fig. 3, the liquid lens 7 is composed of a transparent hard cavity 10, an upper substrate 11, a lower substrate 12, an intermediate substrate 13, a transparent conductive liquid 14, a dielectric layer 15 and an ITO electrode layer 16, wherein the ITO electrode layer 16 and the dielectric layer 15 are sequentially plated on the intermediate substrate 13; transparent non-conductive liquid which is not mutually soluble is filled around the transparent conductive liquid 14; a round hole is arranged in the center of the middle substrate 13, a plurality of small holes are uniformly distributed around the middle substrate as channels for the circulation of transparent conductive liquid, the lower substrate 12 is arranged at the bottom of the transparent hard cavity 10, the transparent conductive liquid 14 is positioned on the upper surface of the lower substrate 12, the middle substrate 13 plated with an ITO electrode layer 16 and a dielectric layer 15 is arranged on the transparent conductive liquid 14, and the upper substrate 11 is arranged on the top surface of the transparent hard cavity 10; in an initial state, two kinds of filled liquid form a convex surface at a liquid-liquid interface, and at the moment, after a light beam passes through a liquid lens, the light beam is converged, namely the function of the positive lens; when a voltage is applied between the ITO electrode layer 16 and the transparent conductive liquid 14, the conductive liquid will flow out through the small holes of the middle substrate due to the electrowetting effect, and the conductive liquid in the central circular hole will be drawn away, so the liquid-liquid interface is a concave surface at this time, and at this time, the light beam is diverged after passing through the liquid lens, i.e. the function of the negative lens.
Further, the transparentLength D of hard cavity 101Not less than 10mm and D1Not more than 12mm, width D2＝D1High D3Not less than 8mm and D3Less than or equal to 10 mm; diameter D of central circular hole of intermediate substrate 134Not less than 5mm and D4Less than or equal to 6mm, and the diameter D of the peripheral small holes5Not less than 1mm and D5Less than or equal to 2mm and thickness D6Not less than 2mm and D6≤3mm。
Further, the distance between the light source and the spatial light modulator is d1The distance between the spatial light modulator and the liquid lens is d2The distance between the receiving screen and the liquid lens is d3，f1Is the focal length of the digital lens loaded onto the spatial light modulator, f2Is the focal length of the liquid lens; when the element position of the system is kept unchanged, the zooming of the reproduced image can be realized by changing the focal lengths of the digital lens and the liquid lens; position of reproduced image satisfies
The size of the reproduced image is
In the formula: λ is the wavelength, p is the pixel size of the spatial light modulator; the size relationship of the three color reproduction images is as follows:
in the formula: hr, Hg and Hb are sizes of three color reproduction images of red, green and blue, f1r、f1gAnd f1bIs the focal length, λ, of a digital lens loaded onto the three color holograms, respectivelyr、λgAnd λbRespectively, the wavelengths of the corresponding colors, and the focal lengths of the digital lenses loaded on the three color holograms are required to satisfy the requirement of compensating the chromatic aberration caused by the wavelengths
Fig. 2 is a zoom principle diagram of the present invention. In the figure, P is the light source, P1Is the position of the image behind the SLM, d1Is the distance between the light source and the SLM, d2Is the distance between the SLM and the liquid lens, d3Is the distance between the receiving screen and the liquid lens. f. of1Is the focal length of the digital lens loaded onto the SLM, f2Is the focal length of the liquid lens. Firstly, respectively recording a hologram of an object and a hologram of a digital lens, secondly, adding the hologram of the digital lens and the hologram of the object to generate a new hologram, wherein the phase of the newly generated hologram satisfies the following formula:
wherein
Is a hologram of the object, λ is the wavelength, P1Behind the SLM, P1At a distance f from the SLM1. According to the diffraction theory, P is known1The size of the treatment image is h ═ f1Lambda/p. The position of the reproduced image satisfies:
the size of the reproduced image is therefore:
in the formula: p is the pixel size of the SLM, and as can be seen from equation (3), by changing the focal lengths of the digital lens and the liquid lens, the zoom of the reproduced image can be achieved while the element positions of the system remain unchanged. The size relationship of the three color reproduction images is as follows:
wherein Hr, Hg and Hb are the sizes of three color reproduction images of red, green and blue, and f1r、f1gAnd f1bIs the focal length, λ, of a digital lens loaded onto the three color holograms, respectivelyr、λgAnd λbRespectively, the wavelength of the corresponding color.
In order to realize the zooming effect, firstly, one color picture is subjected to red, green and blue color separation processing, three holograms with different color scenes are respectively generated, and the phases of the holograms are respectively recorded as
And
the sizes of the reproduced images are different for different wavelengths. In order to compensate for chromatic aberration due to wavelength, the focal length of the digital lens loaded on the three-color hologram is required to satisfy
Then three new holograms with specific focal length are generated according to the formula (1), and the phases of the three new holograms are respectively recorded as
And
to reproduce a color reproduction image of an object, at time T1, a phase of
The SLM is illuminated with a collimated red light source, at which time a reconstructed image of the red object can be seen on the receiving screen; at time T2, a phase of
The SLM is illuminated by a collimated green light source, and a green reproduced image can be seen on the receiving screen; similarly, at time T3, a phase ofThe SLM is illuminated with a collimated blue light source, at which time a blue reproduction image can be seen on the receiving screen; when the switching time is fast enough, depending on the persistence effect of the human eye,a colored holographic representation can be seen. When the focal length of the digital lens is changed, the focal length of the liquid lens can be obtained through calculation. The switching time of the light source, the hologram and the liquid lens is ensured to be consistent by using a synchronous control circuit.
In order to achieve a high quality zoom effect, the present invention uses the liquid lens 7 to adjust the size of the reproduced image in cooperation with the digital lens. Fig. 3 is a schematic diagram of an electrowetting-driven liquid lens structure. As shown in fig. 3(a), four small holes are schematically drawn as channels for the transparent conductive liquid to flow through, and the specific number of the small holes needs to be designed according to the experimental requirements; in the initial state, as shown in fig. 3(c), the two filled liquids form a convex surface at the liquid-liquid interface, and at this time, after the light beam passes through the liquid lens 7, the light beam converges, i.e. the function of the positive lens; after a voltage is applied between the ITO electrode layer and the transparent conductive liquid, the conductive liquid may flow out through the small hole of the middle substrate due to the electrowetting effect, and the conductive liquid in the central circular hole is drawn away, so the liquid-liquid interface is a concave surface at this time, and at this time, after the light beam passes through the liquid lens 7, the light beam diverges, i.e., functions as a negative lens, as shown in fig. 3(b) and 3 (d).
In one embodiment of the present invention, the collimated red light source is red signal light with a wavelength of 671nm, the collimated green light source is green signal light with a wavelength of 532nm, the collimated blue light source is blue signal light with a wavelength of 473nm, the pixel pitch of the SLM is 8 micrometers, the resolution is 1920 × 1080, the distance between the liquid lens and the SLM is 15cm, and the distance between the liquid lens and the receiving screen is 30 cm. Taking the parameters into equations (1) - (3), one can obtain:
the transparent conductive liquid in the liquid lens 7 is NaCl solution, the periphery is filled with dimethyl silicone oil, and the length D of the transparent hard cavity 10 is112mm wide D2＝d1 High D 310 mm. Thickness D of intermediate substrate62mm, central clear aperture diameter D46mm, 4 small holes with the same diameter are distributed on the periphery, and the diameters are D51 mm. In an initial state, the two liquids form a convex surface at a liquid-liquid interface, and the focal power is measured to be + 5.5D; after a voltage of 60V DC is applied between the ITO electrode layer and the NaCl solution, the NaCl solution can flow out through the small holes of the middle substrate due to the electrowetting effect, the liquid-liquid interface is switched from a convex surface to a concave surface at the moment, the focal power of the liquid-liquid interface is measured to be-3.2D, and the liquid lens designed by the embodiment has the zooming function. By adjusting the focal lengths of the digital lens and the liquid lens, the system can realize the function of zooming.
Claims (2)
1. A liquid lens based color holographic zoom system, characterized by: the device comprises a collimated red light source, a collimated green light source, a collimated blue light source, a beam splitter prism, a spatial light modulator, a computer, a liquid lens, a receiving screen and a synchronous control circuit; the collimating red light source, the collimating green light source and the collimating blue light source are arranged on an incident light path of the beam splitter prism, the spatial light modulator is arranged on a reflection light path of the beam splitter prism, the liquid lens is arranged behind the spatial light modulator, and the receiving screen is arranged behind the liquid lens; the signal output end of the spatial light modulator is connected with the signal input end of a computer, the signal input end of the synchronous control circuit is connected with the signal output end of the liquid lens, the signal output end of the synchronous control circuit is connected with the signal input end of the computer, and the control end of the synchronous control circuit is connected with the control ends of the collimated red light source, the collimated green light source and the collimated blue light source; the collimated red light source, the collimated green light source and the collimated blue light source respectively irradiate the spatial light modulator after passing through the beam splitter prism, and the light source controlled by the spatial light modulator is projected to a receiving screen through zooming of the liquid lens; the synchronous control circuit ensures that the switching time of the light source, the hologram and the liquid lens is consistent;
the liquid lens consists of a transparent hard cavity, an upper substrate, a lower substrate, a middle substrate, transparent conductive liquid, a dielectric layer and an ITO electrode layer, wherein the ITO electrode layer and the dielectric layer are sequentially plated on the middle substrate; transparent non-conductive liquid which is not mutually soluble is filled around the transparent conductive liquid; the center of the middle substrate is provided with a round hole, a plurality of small holes are uniformly distributed around the middle substrate to serve as channels for the circulation of transparent conductive liquid, the lower substrate is arranged at the bottom of the transparent hard cavity, the transparent conductive liquid is positioned on the upper surface of the lower substrate, the middle substrate plated with an ITO electrode layer and a dielectric layer is arranged on the transparent conductive liquid, and the upper substrate is arranged on the top surface of the transparent hard cavity; in an initial state, two kinds of filled liquid form a convex surface at a liquid-liquid interface, and at the moment, after a light beam passes through a liquid lens, the light beam is converged, namely the function of the positive lens; when voltage is applied between the ITO electrode layer and the transparent conductive liquid, the conductive liquid can gush out through the small hole of the middle substrate due to the left and right electrowetting effect, and the conductive liquid in the central circular hole can be pumped away, so that the liquid-liquid interface is a concave surface at the time, and the light beam is diffused after passing through the liquid lens, namely the function of a negative lens;
the distance between the light source and the spatial light modulator is d1The distance between the spatial light modulator and the liquid lens is d2The distance between the receiving screen and the liquid lens is d3，f1Is the focal length of the digital lens loaded onto the spatial light modulator, f2Is the focal length of the liquid lens; firstly, respectively recording a hologram of an object and a hologram of a digital lens, secondly, adding the hologram of the digital lens and the hologram of the object to generate a new hologram, wherein the phase of the newly generated hologram satisfies the following formula:
wherein
Is a hologram of the object, λ is the wavelength; when the element position of the system is kept unchanged, the zooming of the reproduced image can be realized by changing the focal lengths of the digital lens and the liquid lens; position of reproduced image satisfiesThe size of the reproduced image isIn the formula: p is the pixel size of the spatial light modulator; the size relationship of the three color reproduction images is as follows:
in the formula: hr, Hg and Hb are sizes of three color reproduction images of red, green and blue, f1r、f1gAnd f1bIs the focal length, λ, of a digital lens loaded onto the three color holograms, respectivelyr、λgAnd λbRespectively, the wavelengths of the corresponding colors, and the focal lengths of the digital lenses loaded on the three color holograms are required to satisfy the requirement of compensating the chromatic aberration caused by the wavelengths
2. The liquid lens based color holographic zoom system of claim 1, wherein: the diameter D of the central circular hole of the middle substrate4Not less than 5mm and D4Less than or equal to 6mm, and the diameter D of the peripheral small holes5Not less than 1mm and D5≤2mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710890543.9A CN107422623B (en) | 2017-09-27 | 2017-09-27 | Color holographic zoom system based on liquid lens |
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| KR102659198B1 (en) | 2018-07-04 | 2024-04-19 | 삼성전자주식회사 | Holographic display apparatus having reduced chromatic aberration |
| CN109782430B (en) * | 2019-03-22 | 2022-07-08 | 京东方科技集团股份有限公司 | Holographic display device and driving method thereof |
| CN109765774B (en) * | 2019-03-22 | 2022-04-19 | 京东方科技集团股份有限公司 | Holographic display device and driving method thereof |
| CN110058506A (en) * | 2019-03-29 | 2019-07-26 | 北京航空航天大学 | A kind of calculating holographic display system based on full-service fluid lens |
| CN110058333B (en) * | 2019-05-07 | 2020-05-08 | 北京航空航天大学 | Large-visual-angle holographic display system based on high-focal-power liquid lens |
| CN111399356B (en) * | 2020-05-15 | 2021-05-07 | 北京航空航天大学 | Color holographic display system with low speckle noise |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298103A (en) * | 2014-10-28 | 2015-01-21 | 四川大学 | Color computational holography aberration compensation system and method based on varifocus lens |
| CN205787618U (en) * | 2016-05-30 | 2016-12-07 | 苏州大学 | Color holographic three-dimensional display device based on time division multiplexing |
| CN104570330B (en) * | 2015-01-14 | 2017-03-22 | 四川大学 | Total reflection liquid optical switch based on electrowetting effect |
-
2017
- 2017-09-27 CN CN201710890543.9A patent/CN107422623B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298103A (en) * | 2014-10-28 | 2015-01-21 | 四川大学 | Color computational holography aberration compensation system and method based on varifocus lens |
| CN104570330B (en) * | 2015-01-14 | 2017-03-22 | 四川大学 | Total reflection liquid optical switch based on electrowetting effect |
| CN205787618U (en) * | 2016-05-30 | 2016-12-07 | 苏州大学 | Color holographic three-dimensional display device based on time division multiplexing |
Non-Patent Citations (2)
| Title |
|---|
| 一种基于液体透镜的全息色差补偿方法;王迪等;《中国激光》;20150531;第0509001-1～0509001-4页 * |
| 电润湿双液体变焦透镜;赵瑞等;《光学精密工程》;20141030;第2592～2596页 * |
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