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CN104698592A - Fresnel lens based naked-eye suspension stereo display system and method - Google Patents

Fresnel lens based naked-eye suspension stereo display system and method Download PDF

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Publication number
CN104698592A
CN104698592A CN201510029625.5A CN201510029625A CN104698592A CN 104698592 A CN104698592 A CN 104698592A CN 201510029625 A CN201510029625 A CN 201510029625A CN 104698592 A CN104698592 A CN 104698592A
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China
Prior art keywords
fresnel lenses
screen
orientation
grating
parallax
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Pending
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CN201510029625.5A
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Chinese (zh)
Inventor
伍媚娜
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Empty Science And Technology Ltd Of Foshan City Intelligence Starfish
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Empty Science And Technology Ltd Of Foshan City Intelligence Starfish
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Priority to CN201510029625.5A priority Critical patent/CN104698592A/en
Publication of CN104698592A publication Critical patent/CN104698592A/en
Pending legal-status Critical Current

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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
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B35/00Stereoscopic photography
    • G03B35/18Stereoscopic photography by simultaneous viewing
    • G03B35/20Stereoscopic photography by simultaneous viewing using two or more projectors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Stereoscopic And Panoramic Photography (AREA)

Abstract

The invention discloses a Fresnel lens based naked-eye suspension stereo display system and method. The system comprises a directional screen, a projector unit and a motor. The directional screen comprises a Fresnel lens group and an optical grating. The Fresnel lens group comprises two Fresnel lenses which are formed by injection of polyolefin materials. The sides of the surfaces of the lenses are smooth faces, and concentric circles from small to big are recorded on the other sides. The projector unit comprises a plurality of mini projectors and is arranged below the directional screen. Lenses of the projectors face towards the directional screen, a plurality of the mini projectors are arranged around a rotation shaft and perform projection by directly facing the directional screen, and the motor is arranged below the projector unit. By means of the display system, naked-eye watching at any angles can be provided for a plurality of people, observed stereo images are different if the positions of people are different, and observers can touch the images with hands as the images protrude from the screen, accordingly, good man-machine interactivity is represented.

Description

Based on bore hole suspension three-dimensional display system and the display packing of Fresnel Lenses
Technical field
The present invention relates to bore hole stereo display technique field, particularly relate to the bore hole suspension three-dimensional display system based on Fresnel Lenses and display packing.
Background technology
The perceptive mode of people to objective world has multiple, and eyes carry the information obtaining ability of the mankind more than 90%, by the obtainable quantity of information of vision considerably beyond obtainable quantity of information of other modes such as the sense of hearing, sense of touch, sense of smell and the sense of taste.Object in reality is all three-dimensional, three-dimensional, and the vision system of human eye can be good at adapting to the three-dimensional world in reality, accurately image information is passed to people.But due to the reason of technology, current most display device can only show the image of two dimension, although also the colourful of the boundless universe can be shown to people, far can not provide the visual information compared with real world, can not allow the world of people's perception solid.Along with the development of science and technology and the raising of people's living standard, people have not only been confined to simply transmit two dimensional surface information for the requirement of display device, but wish that it can provide more true, be rich in stereoscopic sensation, closer to the three-dimensional image information of the actual impression of human eye, three-dimensional stereo display technique is arisen at the historic moment thus.
Image display is one of mankind's important means accepting external information.Three-dimensional display then can the three-dimensional information of reconstructed object, provides the information that object is more comprehensive, full and accurate, has a wide range of applications in fields such as medical science, military affairs, advertising art and stereotelevisions.Current three-dimensional display cannot realize bore hole, the viewing of the wide ken simultaneously, and the suspension of stereo-picture and tangible.Along with the development of stereo display technique, the viewing effect of people to three-dimensional display is had higher requirement, and require that it realizes bore hole 360 ° of panorama viewings, image suspends and has good man-machine interaction.
Although this technical development a very long time, existing three-dimensional display mostly cannot to realize bore hole viewing, panorama and image simultaneously and to suspend tangibly function.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of bore hole suspension three-dimensional display system based on Fresnel Lenses and display packing.The present invention aims to provide one can realize bore hole 3D, the three-dimensional display system can watched in arbitrarily angled bore hole for many people and display packing.
The technical scheme that technical solution problem of the present invention adopts is as follows:
Based on the bore hole suspension three-dimensional display system of Fresnel Lenses, wherein, system comprises:
Projection unit, for providing the disparity map of the stereo article wanting imaging;
Directed screen, for separating of disparity map and by projector's emergent pupil imaging;
Image display area, for showing the 3 D visual image after the process of orientation screen;
Motor, forms the observation band of whole circle for spin orientation screen;
Described projection unit is rearranged around turning axle by multiple microcamera, and just to the projection of orientation screen, the camera lens of described minitype projection machine shields towards orientation, be arranged on directed screen below, described orientation screen is made up of Fresnel Lenses group and grating, described grating is arranged on after Fresnel Lenses group, and described image display area is positioned at directed screen top, and described motor is arranged on the below of projection unit.
The described bore hole suspension three-dimensional display system based on Fresnel Lenses, wherein, described Fresnel Lenses group comprises two panels Fresnel Lenses, be designated as the first Fresnel Lenses and the second Fresnel Lenses respectively, described Fresnel Lenses group is used for the projector's emergent pupil being positioned over the first Fresnel Lenses focal plane place to be imaged on the second Fresnel Lenses focal plane place.
The described bore hole suspension three-dimensional display system based on Fresnel Lenses, wherein, described grating is the horizontal grating of the range of observation for expanding vertical direction.
The described bore hole suspension three-dimensional display system based on Fresnel Lenses, wherein, described Fresnel Lenses is that thickness is less than 5mm eyeglass, and lens surface one side is light face, the concentric circles that another side imprinting is ascending.
The described bore hole suspension three-dimensional display system based on Fresnel Lenses, wherein, described disparity map is the negative parallax visual effect figure in horizontal parallax figure.
The described bore hole suspension stereo display method based on Fresnel Lenses, wherein, method comprises:
A, pre-set the arrangement of projection unit twisted rotary shaft and just to the projection of orientation screen;
B, driven by motor orientation screen High Rotation Speed, will project the imaging of unit emergent pupil, form the observation band that has negative parallax in image display area;
C, repeat step B, until motor rotates a circle, the observation band that formed surrounds whole circle, image display area display suspension stereo-picture is observed for people.
The described bore hole suspension stereo display method based on Fresnel Lenses, wherein, described step B specifically also comprises:
Lens combination and the grating high-speed of B1, driven by motor orientation screen rotate;
Projector's emergent pupil, by rotary course, when projector is positioned at the first Fresnel Lenses focal plane, is imaged on the second Fresnel Lenses focal plane place, and expands vertical range of observation by horizontal grating by B2, directed screen;
The observation band with negative parallax effect of image after B3, emergent pupil imaging between human eye and orientation shield.
The described bore hole suspension stereo display method based on Fresnel Lenses, wherein, described Fresnel Lenses is that thickness is less than 5mm eyeglass, and lens surface one side is light face, the concentric circles that another side imprinting is ascending.
The invention provides a kind of bore hole suspension three-dimensional display system based on Fresnel Lenses and display packing, comprise directed screen, projection unit and motor, directed screen is by Fresnel Lenses group and optical grating constitution, described Fresnel Lenses group comprises two panels Fresnel Lenses, described Fresnel Lenses is the eyeglass being noted pressure by polyolefine material, lens surface one side is light face, the ascending concentric circles of another side imprinting, described projection unit comprises multiple minitype projection machine, described projection unit is arranged on directed screen below, the camera lens of described projector shields towards orientation, multiple minitype projection machine is around turning axle arrangement and just to the projection of orientation screen, described motor is arranged on the below of projection unit.Bore hole suspension three-dimensional display system based on Fresnel Lenses provided by the invention can be watched in arbitrarily angled bore hole for many people, position is different, and the stereo-picture observed is also different, and image goes out screen, observer can touch image with hand, embodies good human-computer interaction.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of the preferred embodiment of the bore hole suspension three-dimensional display system that the present invention is based on Fresnel Lenses.
Fig. 2 is binocular parallax schematic diagram.
Fig. 3 is the orientation screen structural drawing of the preferred embodiment of the bore hole suspension three-dimensional display system that the present invention is based on Fresnel Lenses.
Fig. 4 is the imaging schematic diagram based on Fresnel Lenses group of the preferred embodiment of the bore hole suspension three-dimensional display system that the present invention is based on Fresnel Lenses.
Fig. 5 is the horizontal grating directional scattering principle schematic of the preferred embodiment of the bore hole suspension three-dimensional display system that the present invention is based on Fresnel Lenses.
Fig. 6 is the orientation screen rotation tomography schematic diagram of the preferred embodiment of the bore hole suspension three-dimensional display system that the present invention is based on Fresnel Lenses.
Fig. 7 is the preferred embodiment process flow diagram of the bore hole suspension stereo display method that the present invention is based on Fresnel Lenses.
Embodiment
The invention provides the bore hole suspension three-dimensional display system based on Fresnel Lenses and display packing, for making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides the bore hole suspension three-dimensional display system based on Fresnel Lenses, as shown in Figure 1, described system comprises projection unit 1, for providing the disparity map of the stereo article wanting imaging;
Directed screen 2, for separating of disparity map and the unit 1 emergent pupil imaging that will project;
Image display area 4, for showing the 3 D visual image after orientation screen 2 process;
Motor 3, forms the observation band 5 of whole circle for spin orientation screen 2;
Described projection unit 1 is rearranged around turning axle by multiple minisize photography unit 1, and just to orientation screen 2 projection, the camera lens of described micro projection 1 machine, towards orientation screen 2, is arranged on below directed screen 2.Described orientation screen is made up of Fresnel Lenses group and grating, described grating is arranged on after Fresnel Lenses group, and described image display area is positioned at directed screen top, and described motor is arranged on the below of projection unit, 6 is the eyes of people, and people can see suspension stereo-picture at observation band 5.
As shown in Figure 3, wherein, described Fresnel Lenses group comprises two panels Fresnel Lenses, be designated as the first Fresnel Lenses 21 and the second Fresnel Lenses 22 respectively, described Fresnel Lenses group is used for the projector's emergent pupil being positioned over the first Fresnel Lenses 21 focal plane place to be imaged on the second Fresnel Lenses 33 focal plane place.Described grating is the horizontal grating 23 of the range of observation for expanding vertical direction.
Research shows, the eyes of the mankind mainly come from following several mode for the depth preception of real world, respectively: simple eye mobile parallax, the parallax of two, mediating effect+6, convergence effect.Wherein the parallax of two sees that object produces the topmost reason of stereoscopic sensation and depth perception.
Have the distance of about 65 millimeter between two of the mankind, right eye and left eye go to see between same object to be have slight difference respectively, are the equal of with the different angle Qu Kan world.And the location of eyes to space is such process: as shown in Figure 2,61 is left eye, and 62 is right eye, 10 is in kind, 11 for the actual picture seen of left eye, and 12 be the actual picture seen of right eye, 13 for brain synthesize left and right eyes image information after the image that rebuilds.When eyes see have nuance two width images or scene reflection give brain time, brain is treated as the very complete image of a pair the two width image synthesises received, and creates object and the position of this object in real scene of accurate stereoscopic-state.Observer is made to have sensation that the is three-dimensional and degree of depth also just to define like this.
The described bore hole suspension three-dimensional display system based on Fresnel Lenses, wherein, described Fresnel Lenses is that thickness is less than 5mm eyeglass, and lens surface one side is light face, the concentric circles that another side imprinting is ascending.
The described bore hole suspension three-dimensional display system based on Fresnel Lenses, wherein, described disparity map is the negative parallax visual effect figure in horizontal parallax figure.
Any be taken in solid space identical a bit, different by the direction of the image point position deviation being projected in stereo image pair, be divided into vertical parallax and horizontal parallax.Wherein, vertical parallax refers to the skew of in the vertical direction image point position, and horizontal parallax refers to the skew of image point position in the horizontal direction.But feel discomfort extremely, because eyes are horizontal distribution instead of vertical distribution time vertical parallax can allow eyes observe object.Realize in the process of stereo display so horizontal parallax is usually used in, and as far as possible vertical parallax will avoid in stereo display occurring.
Wherein, horizontal parallax has parallax free respectively, positive parallax, negative parallax, disperses parallax Four types.
1. parallax free
Time line a bit formed in eyes in the imaging point of target object and solid space meets at same point on a display screen, binocular parallax is zero, namely said parallax free above.When viewing this point, can feel that this point is just on screen, that is because the sight line of right and left eyes is intersected in the same point on display screen just.
2. positive parallax
Two lines a bit formed in eyes in the imaging point of target object and solid space and display screen intersect, and the interval between two intersection points is less than the setting of mankind's interpupillary distance, the parallax this moment produced i.e. positive parallax, when presenting positive parallax, when the sight of observer projects on this aspect, after producing the fusion of brain, can feel that this point is deeper than display screen, have a kind of depth perception.
3. negative parallax
Two lines a bit formed in eyes in imaging point and solid space intersect before display screen, and the parallax this moment produced is called negative parallax.When presenting negative parallax, observer can feel that impact point is between display screen and eyes.
4. disperse parallax
Two lines a bit formed in eyes in imaging point and solid space and display screen intersect (not intersecting before display screen), and the interval between two intersection points is greater than the setting of mankind's interpupillary distance, and the parallax this moment produced is called disperses parallax.But when be in disperse parallax, will visual fatigue be felt when the sight of observer projects this point, because exceeded range of fusion and cannot be fused together at these 2.Among actual life, this situation can't be produced, so when making three-dimensional display, also will avoid producing this situation as far as possible.
Tangible in order to make stereo-picture suspend, so image must go out screen and between screen and human eye, according to the feature of above four kinds of parallax types, select negative parallax.
As shown in Fig. 4, of the present invention based in the bore hole suspension display system of Fresnel Lenses, as shown in Figure 4, the effect of Fresnel Lenses group is that the projector's emergent pupil being positioned over the first Fresnel Lenses 21 focal plane place is imaged on the second Fresnel Lenses 22 focal plane place.Grating 23 is as the one of directional diffuser screen, and it by the light of light source 7 incidence to a direction scattering, thus can increase viewing scope, and its principle is as shown in Fig. 5, and horizontal grating has scattering on 23 vertical directions, and scattering angle is .Therefore after Fresnel Lenses group, add the range of observation that horizon light grid expand vertical direction, form vertical observation band.Fresnel Lenses group and grating constitute directed screen, and when projector is arranged in the focus of directed screen the first Fresnel Lenses, directed screen, to projector's emergent pupil imaging, the focal plane of the second Fresnel Lenses forms a vertical observation band.
In order to realize 360 ° of panorama viewings, display adopts multi-projector around turning axle arrangement and just projects to orientation screen, only have when directed screen is just to projector, projector just can project image onto on directed screen, in order to make image, there is tangible property, improve man-machine interaction, image must go out screen and human eye and directed shield between, also namely parallax type is now negative parallax above-mentioned, for Liang Ge projector, as shown in Fig. 6, as seen from the figure, when orientation screen (solid line) is just to the first projector 14, form observation band 51; When orientation screen (dotted line) is just to projector 15, forms observation band 52, when left eye is positioned at observation band 51 and right eye is positioned at observation band 52, the stereopsis of screen can be obtained out.
Bore hole suspension three-dimensional display system based on Fresnel Lenses of the present invention adopts multiple minitype projection machine to provide disparity map, directed screen is separated disparity map and by projector's emergent pupil imaging, form the observation band above display, when beholder's right and left eyes is positioned at different observation band, to corresponding disparity map be received, form stereoscopic vision.Directed screen is by driven by motor High Rotation Speed, and multi-projector arranges around turning axle, when orientation screen is just to one of them projector, by projector's emergent pupil imaging, and square one-tenth observation band over the display.Therefore, motor rotates a circle, and the observation band of formation surrounds whole circle, realize panorama, when human eye is positioned at any two different observation bands, timesharing is received corresponding disparity map, form stereoscopic vision, and be positioned at different positions, will the different side of stereo-picture be observed.
Three-dimensional display system disclosed in this invention increase effectively viewing scope, realizes panorama, can make many people multi angle view stereo-picture simultaneously, and have motion parallax.In display, directed screen adopts slant setting structure, stereopsis can be made to be imaged on outside screen and unobstructed, and therefore image has the sense that suspends, and beholder is tangible to image, better embodies the interactive feature of beholder and image.
Based on said system embodiment, present invention also offers a kind of preferred embodiment of the bore hole suspension stereo display method based on Fresnel Lenses, specifically as shown in Figure 7, method comprises:
Step S100, pre-set the arrangement of projection unit twisted rotary shaft and just to the projection of orientation screen; As detailed above.
Step S200, driven by motor orientation screen High Rotation Speed, will project the imaging of unit emergent pupil, form the observation band that has negative parallax in image display area; As detailed above.
Step S300, repeat step S200, until motor rotates a circle, the observation band that formed surrounds whole circle, image display area display suspension stereo-picture is observed for people; As detailed above.
The described bore hole suspension stereo display method based on Fresnel Lenses, wherein, described step S200 specifically also comprises:
Lens combination and the grating high-speed of S201, driven by motor orientation screen rotate; As detailed above.
Projector's emergent pupil, by rotary course, when projector is positioned at the first Fresnel Lenses focal plane, is imaged on the second Fresnel Lenses focal plane place, and expands vertical range of observation by horizontal grating by S202, directed screen; As detailed above.
The observation band with negative parallax effect of image after S203, emergent pupil imaging between human eye and orientation shield; As detailed above.
The described bore hole suspension stereo display method based on Fresnel Lenses, wherein, described Fresnel Lenses is that thickness is less than 5mm eyeglass, and lens surface one side is light face, the concentric circles that another side imprinting is ascending; As detailed above.
In sum, the invention provides a kind of bore hole suspension three-dimensional display system based on Fresnel Lenses and display packing, comprise directed screen, projection unit and motor, directed screen is by Fresnel Lenses group and optical grating constitution, described Fresnel Lenses group comprises two panels Fresnel Lenses, described Fresnel Lenses is the eyeglass being noted pressure by polyolefine material, lens surface one side is light face, the ascending concentric circles of another side imprinting, described projection unit comprises multiple minitype projection machine, described projection unit is arranged on directed screen below, the camera lens of described projector shields towards orientation, multiple minitype projection machine is around turning axle arrangement and just to the projection of orientation screen, described motor is arranged on the below of projection unit.Bore hole suspension three-dimensional display system based on Fresnel Lenses provided by the invention can be watched in arbitrarily angled bore hole for many people, position is different, and the stereo-picture observed is also different, and image goes out screen, observer can touch image with hand, embodies good human-computer interaction.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.

Claims (2)

1., based on the bore hole suspension three-dimensional display system of Fresnel Lenses, it is characterized in that, system comprises:
Projection unit, for providing the disparity map of the stereo article wanting imaging;
Directed screen, for separating of disparity map and by projector's emergent pupil imaging;
Image display area, for showing the 3 D visual image after the process of orientation screen;
Motor, forms the observation band of whole circle for spin orientation screen;
Described projection unit is rearranged around turning axle by multiple microcamera; and just to the projection of orientation screen; the camera lens of described minitype projection machine shields towards orientation; be arranged on directed screen below; described orientation screen is made up of Fresnel Lenses group and grating; described grating is arranged on after Fresnel Lenses group, and described image display area is positioned at directed screen top, and described motor is arranged on the below of projection unit;
Described Fresnel Lenses group comprises two panels Fresnel Lenses; be designated as the first Fresnel Lenses and the second Fresnel Lenses respectively, described Fresnel Lenses group is used for the projector's emergent pupil being positioned over the first Fresnel Lenses focal plane place to be imaged on the second Fresnel Lenses focal plane place;
Described grating is the horizontal grating of the range of observation for expanding vertical direction;
Described Fresnel Lenses is that thickness is less than 5mm eyeglass, and lens surface one side is light face, the concentric circles that another side imprinting is ascending;
Described disparity map is the negative parallax visual effect figure in horizontal parallax figure.
2. use as claimed in claim 1 based on the bore hole suspension stereo display method of Fresnel Lenses, it is characterized in that, method comprises:
A, pre-set the arrangement of projection unit twisted rotary shaft and just to the projection of orientation screen;
B, driven by motor orientation screen High Rotation Speed, will project the imaging of unit emergent pupil, form the observation band that has negative parallax in image display area;
C, repeat step B, until motor rotates a circle, the observation band that formed surrounds whole circle, image display area display suspension stereo-picture is observed for people;
Described step B specifically also comprises:
Lens combination and the grating high-speed of B1, driven by motor orientation screen rotate;
Projector's emergent pupil, by rotary course, when projector is positioned at the first Fresnel Lenses focal plane, is imaged on the second Fresnel Lenses focal plane place, and expands vertical range of observation by horizontal grating by B2, directed screen;
The observation band with negative parallax effect of image after B3, emergent pupil imaging between human eye and orientation shield;
Described Fresnel Lenses is that thickness is less than 5mm eyeglass, and lens surface one side is light face, the concentric circles that another side imprinting is ascending.
CN201510029625.5A 2015-01-21 2015-01-21 Fresnel lens based naked-eye suspension stereo display system and method Pending CN104698592A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108761817A (en) * 2018-08-16 2018-11-06 深圳市眸合科技有限公司 A kind of bore hole 3D optical films
CN112255879A (en) * 2020-11-02 2021-01-22 重庆睿博光电股份有限公司 Image disc capable of being used for holographic projection and high-cost-performance holographic projection display device
CN114727529A (en) * 2022-04-20 2022-07-08 李云忠 A foldable holographic display mobile device shell structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104267573A (en) * 2014-09-27 2015-01-07 杨灵芝 Novel naked eye suspension stereo display method based on optical parallax

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104267573A (en) * 2014-09-27 2015-01-07 杨灵芝 Novel naked eye suspension stereo display method based on optical parallax

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108761817A (en) * 2018-08-16 2018-11-06 深圳市眸合科技有限公司 A kind of bore hole 3D optical films
CN112255879A (en) * 2020-11-02 2021-01-22 重庆睿博光电股份有限公司 Image disc capable of being used for holographic projection and high-cost-performance holographic projection display device
CN114727529A (en) * 2022-04-20 2022-07-08 李云忠 A foldable holographic display mobile device shell structure

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Application publication date: 20150610