CN109946942A - A kind of high quality Color Full holography display system of strength matching - Google Patents
A kind of high quality Color Full holography display system of strength matching Download PDFInfo
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- CN109946942A CN109946942A CN201910246140.XA CN201910246140A CN109946942A CN 109946942 A CN109946942 A CN 109946942A CN 201910246140 A CN201910246140 A CN 201910246140A CN 109946942 A CN109946942 A CN 109946942A
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Abstract
The present invention proposes a kind of high quality Color Full holography display system of strength matching.The system includes red laser, three collimated light beams of blue laser and green laser, three Amici prisms (BS), three lens, three diaphragms, three spatial light modulators (SLM), a light combination mirror and receiving screen.Three SLM are respectively used to the hologram of three kinds of colors of load.As the corresponding BS of the laser irradiation of three kinds of colors, light is reflected on SLM by BS.Diaphragm is used to eliminate the bad light in reconstruction image and adjusts the intensity of light.Diffraction image passes through BS, lens, diaphragm and light combination mirror respectively, and the image of final three kinds of colors can be overlapped as colored holographic reconstructed image on receiving screen, and the high quality Color Full holography which may be implemented strength matching is shown.
Description
One, technical field
The present invention relates to holography is calculated, it is more particularly related to a kind of high quality of strength matching
Color Full holography display system.
Two, background technique
With the development of opto-electronic device and the raising of computer performance, the holography based on spatial light modulator (SLM) is aobvious
Show that technology is received more and more attention due to its flexible easy-operating feature.Holography is recorded by laser interference
Then the complex amplitude information of object rebuilds the image of object by diffraction principle.Therefore, in order to realize that color hologram is shown, lead to
Often need the laser reconstruction hologram using three kinds of different colours.Traditional color hologram display methods is using one or three
SLM.For example, some researcher's view-based access control model persistence effects and time division multiplexing method realize that color hologram is shown.In addition, being based on three
The method for spacial multiplex of SLM is also able to achieve color hologram system.Although holography display have always been considered as be Three-dimensional Display ideal
Mode, but it is still difficult to apply in real life.In color hologram reproduction, due to the difference and system element of wavelength
It influences, there are color difference in reconstruction image.Due to SLM structure influence, in reconstruction image exist such as high order diffraction image and
The bad light such as high order diffraction light.Further, since human eye is different to different lightsensitivities, and the intensity of laser is lost in use
Also different, therefore the color of the reconstruction image of object may be distorted with original image.For the first two problem, researcher is proposed
Corresponding solution, such as using several solid-state components improve quality reproduction.It is due to using multiple components will increase
The complexity of system, in recent years, the liquid lens based on electrowetting effect or mechanism are also used in holophotal system, to realize
The color hologram system of high quality.However, for third problem, it is still seldom about the report of associated solutions at present.
Three, summary of the invention
The present invention proposes a kind of high quality Color Full holography display system of strength matching.As shown in Fig. 1, the system packet
Include red laser, three collimated light beams of blue laser and green laser, three Amici prisms (BS), three lens, three diaphragms,
Three SLM, a light combination mirror and receiving screen.Three SLM are respectively used to the hologram of three kinds of colors of load.When swashing for three kinds of colors
When light irradiates corresponding BS, light is reflected on SLM by BS.Diaphragm is for eliminating the bad light in reconstruction image and adjusting light
Intensity.Diffraction image passes through BS, lens, diaphragm and light combination mirror respectively, and the image of final three kinds of colors can be overlapped on receiving screen
For colored holographic reconstructed image.
The principle of system proposed by the invention such as attached drawing 2 (a) is shown, wherein d1It is the distance between SLM and lens, diaphragm
On the focal plane of lens.P is the pixel size of SLM, d2It is the distance between lens and receiving screen.Ball is loaded on SLM
Face phase is to separate reproduction image and bad light.When diffraction image passes through diaphragm, bad light is eliminated.Since lens are for different waves
Long light has different refractive index, therefore when the light of different wave length passes through lens, focal length is also different, such as attached drawing 2
(b) shown in.According to hologram diffraction principle, the size of three kinds of color reconstruction images can be indicated with following formula:
Wherein Sr、Sg、SbIt is the size of three kinds of color reconstruction images of red, green and blue, f respectivelyr、fg、fbBe respectively it is red, green,
The focal length of the corresponding lens of three kinds of wavelength of indigo plant, λr、λg、λrIt is the wavelength of three kinds of color laser of red, green, blue, r respectivelyr、rg、rbPoint
It is not the radius of the spherical wave of load.By selecting parameter appropriate, make the reconstruction image of three kinds of colors in identical position weight
It closes.
Diaphragm in system proposed by the invention includes two functions of light intensity attenuation and varying aperture.Such as attached drawing 3 (a)-(b)
It is shown, two kinds of unmixing liquid are filled in cavity, wherein liquid 1 is non-conductive liquid, and liquid 2 is conducting liquid.Bottom
Have dielectric layer and electrode on substrate.Embedding a black masks in bottom substrate.When applying voltage on electrode and liquid 2
When, due to electrowetting effect, conducting liquid is mobile to centre.When voltage difference, moving range is also different.Therefore, the diaphragm
The function of varying aperture may be implemented.By adjusting the pore size of three diaphragms respectively, three kinds of reproduction images of red, green, blue are eliminated
In bad light.In addition, gluing respectively on the substrate of top and bottom, there are two polarizing films, as shown in attached drawing 3 (c)-(d).First
Under beginning state, positivity liquid crystal is perfused in liquid crystal cell, and entire liquid crystal cell is evenly arranged.ITO electrode is located at top
With the inside of bottom substrate, two mutually orthogonal polarizing films are attached on the outside of substrate, the polarization axle and oriented layer of each polarizing film
Frictional direction it is identical, in voltage closed state, liquid crystal molecule has distorted 90 °, so incident polarised light with respect to upper and lower base plate
Entire liquid crystal cell can be penetrated.Under voltage on-state, liquid crystal molecule director changes, when liquid crystal molecule is relative to upper
When lower substrate distorts 0 °, light does not have any phase delay by liquid crystal molecule, therefore all incident lights are all orthogonally polarized relative to the first polarization state piece resistance
Gear.By adjusting the voltage of liquid crystal layer in three diaphragms respectively, the light intensity for controlling three kinds of color reconstruction images is identical, realizes high-quality
Amount Color Full holography is shown.
Preferentially, liquid 1 is identical with the density of liquid 2.
Four, Detailed description of the invention
Attached drawing 1 is a kind of schematic diagram of the high quality Color Full holography display system of strength matching of the invention.
Attached drawing 2 is a kind of schematic illustration of the high quality Color Full holography display system of strength matching of the invention.It is attached
Fig. 2 (a) is the schematic illustration of monochromatic holographic display system, and attached drawing 2 (b) is color difference schematic illustration.
Attached drawing 3 is the structural schematic diagram of diaphragm.Attached drawing 3 (a) is the structural schematic diagram that voltage time door screen is not added, attached drawing 3 (b)
The structural schematic diagram of diaphragm when being making alive, attached drawing 3 (c) are the light passing status diagram of polarizing film when voltage is not added, attached drawing 3
(d) when being making alive polarizing film light passing status diagram.
Shown by reference numeral in above-mentioned each attached drawing are as follows:
(1) red laser, (2) blue laser, (3) green laser, (4) SLM1, (5) SLM2, (6) BS1, (7) lens 1,
(8) diaphragm 1, (9) SLM3, (10) BS2, (11) lens 2, (12) diaphragm 2, (13) BS3, (14) lens 3, (15) diaphragm 3, (16)
Light combination mirror, (17) receiving screen, (18) liquid 1, (19) liquid 2, (20) electrode, (21) dielectric layer, (22) black masks, (23) are inclined
Shake piece 1, (24) polarizing film 2, (25) liquid crystal molecule.
It should be understood that above-mentioned attached drawing is only schematical, it is not drawn to draw.
Five, specific embodiment
The following detailed description of a kind of implementation of the high quality Color Full holography display system of strength matching proposed by the present invention
Example, is further described the present invention.It is done further it is necessarily pointed out that following embodiment is served only for the present invention
Explanation, should not be understood as limiting the scope of the invention, field person skilled in the art is according to foregoing invention content pair
The present invention makes some nonessential modifications and adaptations, still falls within protection scope of the present invention.
One embodiment of the present of invention are as follows: in an experiment, the Pixel Dimensions of SLM are 6.4 μm, resolution ratio is 1920 ×
1080.The wavelength of three collimated light beams is λr=632nm, λg=532nm, λb=471nm.The size and transmissivity of BS be respectively
25.4mm × 25.4mm × 25.4mm and > 80%.Output power > 50mw of laser.In order to realize ideal holographic display, system
The diaphragm based on electrowetting effect is made.The liquid crystal material used in an experiment is E7LC (viscosity constant=29Pa.s, o and e wave
Refractive index be n respectivelye=1.741 and no=1.517, dielectric anisotropy is Δ=11.4).By changing liquid crystal in diaphragm
The voltage of layer adjusts the luminous intensity of reconstruction image in which can be convenient ground.It can change by applying voltage on electrode and liquid 2
The size of diaphragm.In an experiment, with polymethylphenyl siloxane fluid (density 1.03g/cm3) it is used as liquid 1, the propyl alcohol that will be mixed with ink
(density is~1.03g/cm3) it is used as black liquor.In the initial state, liquid 2 is adhered on the side wall of substrate.Iris is aobvious
Show maximum ring, aperture is about 12.4mm.As U > 35V, liquid 2 starts mobile to center.It, can by changing the size of diaphragm
To eliminate the bad light in reproduction image.Therefore, using the diaphragm proposed in system, realize that light intensity is adjustable full-color with can be convenient
Color high-quality holographic display system.
Claims (3)
1. a kind of high quality Color Full holography display system of strength matching, which is characterized in that the system include: red laser,
Three collimated light beams of blue laser and green laser, three Amici prisms (BS), three lens, three diaphragms, three SLM, one
A light combination mirror and receiving screen；Three SLM are respectively used to the hologram of three kinds of colors of load, when the laser irradiation of three kinds of colors is corresponding
BS when, light is reflected on SLM by BS, and diaphragm is used to eliminate the bad light in reconstruction image and adjusts the intensity of light；Diffraction
As respectively by BS, lens, diaphragm and light combination mirror, the image of final three kinds of colors can be overlapped as the complete of colour on receiving screen
Cease reproduction image.
2. a kind of high quality Color Full holography display system of strength matching according to claim 1, which is characterized in that d1
It is the distance between SLM and lens, diaphragm is located on the focal plane of lens, and p is the pixel size of SLM, d2It is lens and reception
The distance between screen loads spherical phase on SLM to separate reproduction image and bad light；It is bad when diffraction image passes through diaphragm
Light is eliminated, since light of the lens for different wave length has different refractive index, when the light of different wave length passes through lens,
Focal length is also different, and according to hologram diffraction principle, the size of three kinds of color reconstruction images can be indicated with following formula:
Wherein Sr、Sg、SbIt is the size of three kinds of color reconstruction images of red, green and blue, f respectivelyr、fg、fbIt is red, green, blue three respectively
The focal length of the corresponding lens of kind wavelength, λr、λg、λrIt is the wavelength of three kinds of color laser of red, green, blue, r respectivelyr、rg、rbIt is respectively
The radius of the spherical wave of load is overlapped the reconstruction image of three kinds of colors in identical position by selecting parameter appropriate.
3. a kind of high quality Color Full holography display system of strength matching according to claim 1, which is characterized in that light
Door screen includes two functions of light intensity attenuation and varying aperture, is filled with two kinds of unmixing liquid in cavity, wherein liquid 1 is not lead
Electro-hydraulic body, liquid 2 are conducting liquids, have dielectric layer and electrode on bottom substrate, embedding a black masks in bottom substrate；
When applying voltage on electrode and liquid 2, due to electrowetting effect, conducting liquid is mobile to centre, when voltage difference, moves
Dynamic range is also different, which may be implemented the function of varying aperture；By adjusting the pore size of three diaphragms respectively, eliminate
Bad light in three kinds of reproduction images of red, green, blue；In addition, gluing respectively on the substrate of top and bottom, there are two polarizing films, initial
Under state, positivity liquid crystal is perfused in liquid crystal cell, entire liquid crystal cell be it is evenly arranged, ITO electrode be located at top and
The inside of bottom substrate, two mutually orthogonal polarizing films are attached on the outside of substrate, the polarization axle of each polarizing film and oriented layer
Frictional direction is identical, and in voltage closed state, liquid crystal molecule has distorted 90 ° with respect to upper and lower base plate, and incident polarised light can be saturating
Cross entire liquid crystal cell；Under voltage on-state, liquid crystal molecule director changes, when liquid crystal molecule is relative to upper and lower base plate
When distorting 0 °, light does not have any phase delay by liquid crystal molecule, therefore all incident lights are all orthogonally polarized relative to the first polarization state piece blocking, pass through
The voltage of three diaphragms is adjusted respectively, and the light intensity for controlling three kinds of color reconstruction images is identical, realizes that high quality Color Full holography is aobvious
Show, liquid 1 is identical with the density of liquid 2.
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