CN105487245A - Suspension integrated imaging 3D display based on holographic optical elements - Google Patents

Suspension integrated imaging 3D display based on holographic optical elements Download PDF

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Publication number
CN105487245A
CN105487245A CN201610039570.0A CN201610039570A CN105487245A CN 105487245 A CN105487245 A CN 105487245A CN 201610039570 A CN201610039570 A CN 201610039570A CN 105487245 A CN105487245 A CN 105487245A
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China
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holographic
microlens array
oblique
optical elements
micro
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CN201610039570.0A
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CN105487245B (en
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邓欢
王琼华
余文涛
张汉乐
李大海
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Sichuan University
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Sichuan University
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
    • G02B30/56Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04Processes or apparatus for producing holograms
    • G03H1/10Processes or apparatus for producing holograms using modulated reference beam

Abstract

The invention provides suspension integrated imaging 3D display based on holographic optical elements. The suspension integrated imaging 3D display comprises two processes of holographic recording and the suspension integrated imaging 3D display of oblique micro-lens array holographic optical elements. In the holographic recording process of the oblique micro-lens array holographic optical elements, signal waves are obliquely incident to micro-lens arrays and converted into oblique spherical waves through convergence of the micro-lens arrays. Interference of the oblique spherical waves and reference waves occurs, and interference fringes are recorded on holographic material so that a holographic plate is obtained. In the process of the suspension integrated imaging 3D display, lighting waves carry micro-image array information and irradiate the holographic plate at the same incident angle with that of the reference waves in recording so as to reconstruct the same oblique spherical waves in recording. The oblique spherical waves carry the micro-image array information and reproduce fully realistic integrated imaging 3D images so that the suspension integrated imaging 3D display can be realized.

Description

Floated integration imaging 3D based on holographic optical elements (HOE) shows
Technical field
The present invention relates to suspension display technique and integration imaging 3D display technique, the floated integration imaging 3D particularly based on holographic optical elements (HOE) shows.
Background technology
Along with the development of display technique, the requirement of people to show image is more and more higher, is no longer limited to and watches image by display screen.The display that suspends is a kind of fantasy technology of show image in the space without any medium, and it can show the skyborne image that suspends, and will have better man-machine interaction characteristic.Suspension display technique can restore the real topography of object better, and the image of suspension is tangible, and the virtual image of display also can merge with the real-world object in space, enhances enjoyment and the feeling of immersion of beholder.Show the 2D image of only display plane if suspended, just lose 3D information, and the virtual 2D image of display does not have depth cueing, the contradiction regulated with set after merging with real-world object, will be caused, produce stereos copic viewing visual fatigue.
Integration imaging display is a kind of true 3D display technique, is realized by microlens array additional before display screen, and the light-ray condensing reduction that in procedure for displaying, micro-pattern matrix sends by microlens array, reconstructs the field information of former 3D object.Integration imaging 3D shows the light information that energy reproducing 3D scene sends or reflects, thus constructs authentic 3D rendering.Integration imaging 3D display has to be reproduced without the need to auxiliary evaluation equipment, authentic 3D, without visual fatigue, provides the advantage such as correct depth cueing and quasi-continuous viewing viewpoint, is a kind of true 3D display.Suspension display is shown with integration imaging 3D and combines and can restore authentic 3D rendering in space, and solve stereos copic viewing visual fatigue problem.
Summary of the invention
The present invention proposes to show based on the floated integration imaging 3D of holographic optical elements (HOE), and the holographic recording and the floated integration imaging 3D that comprise tilted microlens array holographic optical elements (HOE) show two processes.In the holographic recording process of tilted microlens array holographic optical elements (HOE), signal wave oblique incidence microlens array, after microlens array is assembled, become oblique ball ground roll, this oblique ball ground roll and reference wave interfere, holographic material records interference fringe, obtains holographic dry plate.In floated integration imaging 3D procedure for displaying, illumination ripple carries micro-pattern matrix information, and irradiate holographic dry plate with the incident angle identical with reference wave during record, reconstruct the oblique ball ground roll identical with when recording, this oblique ball ground roll carries micro-pattern matrix information, the integration imaging 3D rendering that reproducing is authentic, realizes Floating integration imaging 3D and shows.
The holographic recording process of described tilted microlens array holographic optical elements (HOE), as shown in Figure 1.In microlens array, lens cells pitch is p, and focal length is f.Holographic material spreading in clear glass substrate, and fits tightly with microlens array.Signal wave is a branch of directional light, oblique incidence microlens array, and incident angle is θ 1, signal wave forms convergent point on the back focal plane of each lens cells, and forms convergent point array, and each convergent point is obtained by formula (1) relative to the side-play amount d of its corresponding lens cells optical axis,
d=ftanθ 1(1)
The spacing of adjacent convergent point equals lens cells pitch P.Signal wave is converted into through microlens array that convergent point array is backward outer to be dispersed, and becomes oblique ball ground roll, the tilt angle theta of this oblique ball ground roll 2with the incident angle θ of signal wave 1equal.Reference wave is also a branch of directional light, has identical wavelength and polarization state with signal wave, and reference wave and signal wave are incident from the both sides of microlens array respectively.Reference wave is with incidence angle θ 3irradiate microlens array, and with inclination spherical waves interfere, holographic material records interference fringe, completes the holographic recording of tilted microlens array holographic optical elements (HOE).Holographic dry plate after development, fixing process has recorded the convergence characteristics of microlens array to the directional light of oblique incidence.
Floated integration imaging 3D procedure for displaying, as shown in Figure 2.Illumination ripple is a branch of directional light, its wavelength with reference wave and signal wave when recording and polarization state identical.Illumination ripple comprises the information of micro-pattern matrix and oblique illumination holographic dry plate, and incident angle is identical with the incident angle of reference wave when recording, and is all θ 3.Reference wave when illumination ripple during reproduction and record meets Bragg matching condition.In micro-pattern matrix, image primitive pitch is identical with lens cells pitch in microlens array, and the posting field of the view field of image primitive and lens cells coincides.Oblique ball ground roll during the light reproducing record of hologram diffraction, this oblique ball ground roll forms convergent point array again, identical with the convergent point array that microlens array during record produces.Holographic dry plate lies low placement, and carry the 3D rendering that the oblique ball ground roll reproducing of micro-pattern matrix information is authentic, this 3D rendering is suspended on holographic dry plate, and its view direction is viewing of tilting, viewing angle θ 4with the incident angle θ of signal wave during holographic recording 1equal, achieve Floating integration imaging 3D display effect.
Accompanying drawing explanation
Accompanying drawing 1 is the holographic recording schematic diagram of tilted microlens array holographic optical elements (HOE)
Accompanying drawing 2 is that floated integration imaging 3D shows schematic diagram
Shown by reference numeral in above-mentioned accompanying drawing is:
1 microlens array, 2 holographic materials, 3 signal waves, 4 reference waves, 5 convergent point arrays, 6 oblique ball ground rolls, 7 holographic dry plates, 8 illumination ripples, 93D image, 10 beholders.
Should be appreciated that above-mentioned accompanying drawing just schematically, do not draw in proportion.
Embodiment
The following detailed description of the exemplary embodiments shown based on the floated integration imaging 3D of holographic optical elements (HOE) of the present invention, the present invention is further described specifically.What be necessary to herein means out is; following examples are only described further for the present invention; limiting the scope of the invention can not be interpreted as; this art skilled person makes some nonessential improvement and adjustment according to the invention described above content to the present invention, still belongs to protection scope of the present invention.
The present invention proposes to show based on the floated integration imaging 3D of holographic optical elements (HOE), and the holographic recording and the floated integration imaging 3D that comprise tilted microlens array holographic optical elements (HOE) show two processes.
The holographic recording process of described tilted microlens array holographic optical elements (HOE), as shown in Figure 1.In microlens array, lens cells pitch is p=1mm, and focal length is f=3.3mm.Holographic material spreading in clear glass substrate, and fits tightly with microlens array.Signal wave is a branch of directional light, oblique incidence microlens array, and incident angle is θ 1=45 °, signal wave forms convergent point on the back focal plane of each lens cells, and forms convergent point array, and each convergent point is calculated by formula (1) relative to the side-play amount d of its corresponding lens cells optical axis, d=3.3mm, the spacing of adjacent convergent point equals lens cells pitch 1mm.Signal wave is converted into through microlens array that convergent point array is backward outer to be dispersed, and becomes oblique ball ground roll, the tilt angle theta of this oblique ball ground roll 2with the incident angle θ of signal wave 1equal, be all 45 °.Reference wave is also a branch of directional light, has identical wavelength and polarization state with signal wave, and wavelength is 731nm, and polarization state is vertical polarization, and reference wave and signal wave are incident from the both sides of microlens array respectively.Reference wave is with incidence angle θ 3=60 ° irradiate microlens arrays, and with inclination spherical waves interfere, holographic material records interference fringe, completes the holographic recording of tilted microlens array holographic optical elements (HOE).Holographic dry plate after development, fixing process has recorded the convergence characteristics of microlens array to the directional light of oblique incidence.
Floated integration imaging 3D procedure for displaying, as shown in Figure 2.Illumination ripple is a branch of directional light, its wavelength with reference wave and signal wave when recording and polarization state identical, wavelength is 731nm, and polarization state is vertical polarization.Illumination ripple comprises the information of micro-pattern matrix and oblique illumination holographic dry plate, and incident angle is identical with the incident angle of reference wave when recording, and is all θ 3=60 °.Reference wave when illumination ripple during reproduction and record meets Bragg matching condition.In micro-pattern matrix, image primitive pitch is identical with lens cells pitch in microlens array, be all 1mm, and the posting field of the view field of image primitive and lens cells coincides.Oblique ball ground roll during the light reproducing record of hologram diffraction, this oblique ball ground roll forms convergent point array again, identical with the convergent point array that microlens array during record produces.Holographic dry plate lies low placement, and carry the 3D rendering that the oblique ball ground roll reproducing of micro-pattern matrix information is authentic, this 3D rendering is suspended on holographic dry plate, and its view direction is viewing of tilting, viewing angle θ 4with the incident angle θ of signal wave during holographic recording 1equal, be all 45 °, beholder, when watching, feels that this 3D rendering has departed from holographic dry plate, suspends in space, achieves Floating integration imaging 3D display effect.

Claims (1)

1. the floated integration imaging 3D based on holographic optical elements (HOE) shows, it is characterized in that, the holographic recording and the floated integration imaging 3D that the present invention includes tilted microlens array holographic optical elements (HOE) show two processes, in the holographic recording process of tilted microlens array holographic optical elements (HOE), in microlens array, lens cells pitch is p, focal length is f, holographic material spreading is in clear glass substrate, and fit tightly with microlens array, signal wave is a branch of directional light, oblique incidence microlens array, incident angle is θ 1, signal wave forms convergent point on the back focal plane of each lens cells, and forms convergent point array, each convergent point relative to the side-play amount d of its corresponding lens cells optical axis by formula d=ftan θ 1obtain, the spacing of adjacent convergent point equals lens cells pitch P, and signal wave is converted into through microlens array that convergent point array is backward outer to be dispersed, and becomes oblique ball ground roll, the tilt angle theta of this oblique ball ground roll 2with the incident angle θ of signal wave 1equal, reference wave is also a branch of directional light, has identical wavelength and polarization state with signal wave, and reference wave and signal wave are incident from the both sides of microlens array respectively, and reference wave is with incidence angle θ 3irradiate microlens array, and with inclination spherical waves interfere, holographic material records interference fringe, complete the holographic recording of tilted microlens array holographic optical elements (HOE), the holographic dry plate after development, fixing process has recorded the convergence characteristics of microlens array to the directional light of oblique incidence, in floated integration imaging 3D procedure for displaying, illumination ripple is a branch of directional light, when itself and record the wavelength of reference wave and signal wave and polarization state identical, the ripple that throws light on comprises the information of micro-pattern matrix and oblique illumination holographic dry plate, when incident angle and record, the incident angle of reference wave is identical, is all θ 3, reference wave when illumination ripple during reproduction and record meets Bragg matching condition, in micro-pattern matrix, image primitive pitch is identical with lens cells pitch in microlens array, and the posting field of the view field of image primitive and lens cells coincides, oblique ball ground roll during the light reproducing record of hologram diffraction, this oblique ball ground roll forms convergent point array again, identical with the convergent point array that microlens array during record produces, holographic dry plate lies low placement, carry the 3D rendering that the oblique ball ground roll reproducing of micro-pattern matrix information is authentic, this 3D rendering is suspended on holographic dry plate, its view direction is viewing of tilting, viewing angle θ 4with the incident angle θ of signal wave during holographic recording 1equal, achieve Floating integration imaging 3D display effect.
CN201610039570.0A 2016-01-21 2016-01-21 Floated integration imaging 3D based on holographic optical elements (HOE) is shown Active CN105487245B (en)

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CN107765438A (en) * 2016-08-18 2018-03-06 群睿股份有限公司 Image display and image display method
CN107203050A (en) * 2016-11-28 2017-09-26 四川大学 Double vision integration imaging 3D display methods based on holographic optical elements (HOE)
CN107203050B (en) * 2016-11-28 2019-07-30 四川大学 Double vision integration imaging 3D display method based on holographic optical elements (HOE)
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CN111867850A (en) * 2017-12-14 2020-10-30 欧贝特信托公司 Assembly comprising at least one array of microimages and a composite transparent device, and security document comprising such an assembly
CN109100874A (en) * 2018-05-29 2018-12-28 上海交通大学 A kind of nearly eye real three-dimensional display system and its method based on holographic optical elements (HOE)
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CN111880390A (en) * 2020-03-04 2020-11-03 北京航空航天大学 Color holographic 3D display system based on white light illumination
CN111524126A (en) * 2020-04-29 2020-08-11 四川大学 Automatic feature and morphology recognition method
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