CN107024776A - Prism tunnel motor vehicle space shows system - Google Patents
Prism tunnel motor vehicle space shows system Download PDFInfo
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- CN107024776A CN107024776A CN201710363476.5A CN201710363476A CN107024776A CN 107024776 A CN107024776 A CN 107024776A CN 201710363476 A CN201710363476 A CN 201710363476A CN 107024776 A CN107024776 A CN 107024776A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical 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
- G02B30/26—Optical 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
- G02B30/27—Optical 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F19/00—Advertising or display means not otherwise provided for
- G09F19/22—Advertising or display means on roads, walls or similar surfaces, e.g. illuminated
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
- H04N13/31—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/398—Synchronisation thereof; Control thereof
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Optics & Photonics (AREA)
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Marketing (AREA)
Abstract
System is shown the invention discloses a kind of prism tunnel motor vehicle space, is related to photoelectric display technical field.The present invention includes equidistantly being vertically arranged multigroup LED light group on tunnel wall, in front of every group of lamp group middle apartPlace is provided with column prism, and the column prism levels are set and parallel to LED light group；Be provided with light barrier above and below the column prism, column prism be arranged on above and below between two pieces of light barriers；Every group of LED light group is divided into N sections.The prism tunnel motor vehicle space of the present invention shows system, and light penetration is greatly improved, and luminance loss is reduced, more saved, and the present invention uses column prism, and image boundary is clear, improves the display quality of stereo-picture.
Description
Technical field
The present invention relates to photoelectric display technical field, the three-dimensional display system in tunnel is especially for, more specifically
Say that being related to a kind of prism tunnel motor vehicle space shows system in ground.
Background technology
With the development of subway and other tunnel Vehicular systems, people select more convenient mode to go on a journey, and 98.7%
Audient represent to see underground tunnel advertisement during subway is taken after prompting, the whole nation more than 200 is organized resource and can realized
Each main transfer point in city and comprehensive covering of main flow consumption circle.Therefore, within the enclosed space, passenger is in high-speed mobile
A series of continuous high clear colorful animations are seen on subway, the visual experience of shock can be brought.
And existing tunnel shows system mainly using two kinds of technologies, one kind is static led display screens, it is necessary to be arrived 200
It is continuous in 800 meters of tunnel wall to install 400 to 800, by limiting the visual of every individual picture of width being arranged in tunnel wall
Angle, when train high-speed motion, make be arranged on tunnel wall on picture with passenger's relatively fixed position one by one
Quickly flash, so that passenger experiences animation effect.Make this advertisement need to take during design first video recording or
Person has shot ad content, then resolves into the continuity image of fixed frame frequency by related software, and these images are spelled
It is connected into continuous pictures, then deliver advertising pictures on LED display in order by control centre.For frame stabilization, lead to
The speed of service between the station of the lower subway train of first actual measuring and calculating is often needed, only in speed stable region（Generally substantially at the uniform velocity
The region of traveling）, such as two station interludes, which are delivered, does not just have the problem of F.F. or hangover.
Another is LED array light beam, and the vertical LED array light beam of a rule, each light beam are installed on tunnel inner wall
It is highly nearly 1 meter, nearly 600 LED are dispersed with above as a row pixel, and about 1.2 meters are spaced between two photophores.When train is quiet
When only, the luminous point of a variety of colors on every light beam is can only see, when train is quickly moved, is utilized " persistence of vision "
Principle can form dynamic picture.Sense the travel speed of train in real time using synchronous inductor, train by when, together
Walk the glow frequency of inductor respective drive LED array light beam.Train speed is slower, and luminous frequency is higher, train speed
Faster, then glow frequency is lower.Like this by the micro- distinguishing picture of stroboscopic, colored walking advertisement picture is just presented on passenger
In front.
In addition, occur in that a kind of auto-stereo display system for subway tunnel now, such as State Intellectual Property Office in
On April 23rd, 2014, disclose a Publication No. CN102213836B, a kind of entitled " freely standing for subway tunnel
The patent of invention of body display system ", it shows that the LED light post of system is made up of multiple row LED and slit grating, and the two cooperation can
Passenger is set to see stereo-picture in the case of without wearing glasses.When a slit grating is placed in before LED light post so that head is moved
When dynamic, each eye can only see a row LED through slit, and eyes see adjacent column LED.The placement of slit grating can cause
The width of one row LED illuminated areas is just equal to the double interocular distances of observer.When train driving passes through LED light post, on light beam
Each LED will form a scan line in the passenger visual field.It is assumed that only one of which light beam in the passenger visual field, then a LED light post
The scanning process of a two field picture can be completed.When LED flashes luminous according to certain pel array, and it is sufficiently high to scan frame per second
When, passenger is it is seen that steady and audible still image or animation sequence.
Prior art, traditional led screens, want outside the windows of subway of traveling present 30 seconds advertisement, it is necessary to screen,
Up to one kilometer.Not only cost is extremely high, and can consume more electric energy.For frame stabilization, subway can only be selected substantially
Between the section at the uniform velocity travelled, such as two station ground.And led light beams, although cost is relatively low, but is drawn when speed is unmatched
Face can be compressed or widen.
System is shown for currently the only one three-dimensional tunnel（CN201110118688）, it also has several crucial ask
Topic.First, because it is by the way of slit grating, in order to ensure that right and left eyes can only see independent picture, the width of interpupillary distance
It is required that raster width is strict controlled in a narrower fixed value, LED pixel sends scattered light, and slit has one with pixel
The light of set a distance, only part can be by slit, and this design is relatively low for the utilization rate of light.The bright solid to see clearly
Image is, it is necessary to increase the luminous flux of LED pixel output, and this can increase energy consumption, reduces the service life of system.Second, because narrow
Seam is not the optical system of an orientation, and by specific slit dispersion can occur for this light for resulting in different wave length, these
Light is in mixing because different degrees of dispersion causes colour cast.This colour cast largely reduces stereoscopic display quality so that
The picture edge blurry that passenger sees, colour cast.
The content of the invention
It is vertical the invention provides a kind of prism tunnel vehicle in order to overcome defect present in above-mentioned prior art and deficiency
Body shows system, it is an object of the invention to the reduction energy consumption of Stereo display system compared with prior art, increases the service life, solves
Slit of having determined is low to the utilization rate of light, the problems such as display quality is poor.For from technological angle, existing scheme uses grating side
Case is, it is necessary to very high manufacture control accuracy.Machine that glazed area is limited, the dust in tunnel influences very big to its printing opacity.
The prism tunnel motor vehicle space of the present invention shows system, and light penetration is greatly improved, and luminance loss is reduced, using column rib
Mirror, image boundary is clear, improves the display quality of stereo-picture.
In order to solve above-mentioned problems of the prior art, the present invention is achieved through the following technical solutions：
Prism tunnel motor vehicle space shows system, it is characterised in that：It is multigroup on tunnel wall including being equidistantly vertically arranged
Spacing between LED light group, two adjacent groups LED light group is, every group of lamp group middle front is apartPlace is provided with column rib
Mirror, the column prism levels are set and parallel to LED light group, and column prism is apart from the vertical range of observer's eyes；
Be provided with light barrier above and below the column prism, column prism be arranged on above and below between two pieces of light barriers；Every group
LED light group is divided into N sections, and the width of every group of LED light group is, every group of LED light group is by a diameter of of multiple row equidistantly distributed's
LED is constituted；The multiple row LED and column prism of every group of LED light group constitute projection area, the picture numbers that every section of LED light group section is constituted
1-N, presses certain frequency checker, it is assumed that have K width view cyclical-transformations according to the instant speed of train, in t, vehicle correspondence
This group of LED light group should show Image (k, t)=[V*t/ ()] modK+1 width figures, [] represents that fractions omitted is rounded, mod
It is to take the remainder,Interpupillary distance is represented, V represents instant speed；
In t, Image (k, t) is shown by a certain section of LED light group section of this group of view, i.e., in t,J sections will
Display Image (k, t) image, wherein j=[V*t/ (/ N)] modN+1, i.e., along vehicle forward direction, every group of LED is divided into N
Section, sequence number 1-N, if jth frame shows 1,2 ... N, the frame of jth+1 shows 2,3 ... N, 1, the frame of jth+2 show 3,4 ... N, 1,
2 ... ... are converted by such rule so that light is maintained at image in observer's right and left eyes all the time not after column prism
Become, observer is it is seen that steady and audible still image or animation sequence.
The column prism is arranged between tunnel wall and vehicle by support frame support, is right against in the middle of LED light group, is put down
Row and the LED light group on wall, light project observer's eyes by column prism, keep eyes to see at least two width simultaneously
Single view, effect of the image in brain compound stereoscopic.
The timely speed is measured by speed synchronous inductor.
The timely speed of the vehicle。
Every group of LED light group is divided into 8 sections of LED light group sections.
Spacing between the two adjacent groups LED light group。
Compared with prior art, the beneficial technique effect that the present invention is brought is shown：
1st, the auto-stereo display system of tunnel vehicle of the present invention has abandoned existing grating approach, employs column prism side
Case, this is a kind of directing optical system, contrasts grating approach, using column prism scheme, light penetration is greatly improved, light profit
Improved with rate.Prism orients light, reduces the conduction loss of light.Other prism scheme, will not be as different wave length in grating slit
Light cause colour cast because of dispersion, using column prism, image boundary is clear, so as to improve the display quality of stereo-picture.
2nd, prism tunnel motor vehicle space of the invention shows system contrast grating approach, realizes and is relatively easy in technique,
Preparing grating needs very high precision controlling, the technological requirement height to making grating.It is limited that grating machines rear glazed area,
Dust in tunnel influences very big to its light transmittance.
3rd, prism tunnel motor vehicle space of the invention shows system, and slit light of the prior art is replaced using column prism
The mode of grid, column prism light penetration is greatly improved, and light utilization efficiency is high, while every group of LED light group of the present invention is divided into N
Section, current bore hole 3D technology is highly developed, and bore hole 3D is the problems of at present not only in resolution ratio and refresh rate
Aspect, is mainly difficult to ensure that the image for reflexing to right and left eyes must be realized and matches, bore hole 3D to the distance of beholder,
Orientation, angle have more strict requirements, and every group of LED light group using column prism and is divided into N sections by the present invention, works as car
When passing through, this group of LED light group show Image (k, t)=[V*t/ ()] modK+1 width figures, and certain in this group of LED light group
One section of LED light group section, i.e., in t,J sections will show Image (k, t) image, wherein j=[V*t/ (/N)]modN
+ 1, i.e., along vehicle forward direction, every group of LED is divided into N sections, sequence number 1-N, if jth frame shows 1,2 ... N, the frame of jth+1
2,3 ... N, 1 are shown, the frame of jth+2 shows that 3,4 ... N, 1,2 ... ... are converted by such rule so that light passes through column rib
The image being maintained at after mirror in observer's right and left eyes is constant all the time, observer it is seen that steady and audible still image or
Animation sequence.The application this specific designs, it is ensured that observer's eyes it can be seen that steady and audible still image or
Animation sequence, and can effectively prevent subregion third dimension substantially and in addition region display entanglement the problem of.
Brief description of the drawings
Fig. 1 is three-dimensional display system structural representation of the present invention；
Fig. 2 is the position view of three-dimensional display system of the present invention；
Reference：1st, LED, 2, column prism, 3, light barrier, 4, projected area, 5, observer.
Embodiment
Embodiment 1
As a preferred embodiment of the present invention, with reference to Figure of description 1 and 2, present embodiment discloses：
Prism tunnel motor vehicle space shows system, it is characterised in that：It is multigroup on tunnel wall including being equidistantly vertically arranged
Spacing between LED light group, two adjacent groups LED light group is, every group of lamp group middle front is apartPlace is provided with column rib
Mirror, the column prism levels are set and parallel to LED light group, and column prism is apart from the vertical range of observer's eyes；
Be provided with light barrier above and below the column prism, column prism be arranged on above and below between two pieces of light barriers；Every group
LED light group is divided into N sections, and the width of every group of LED light group is, every group of LED light group is by a diameter of of multiple row equidistantly distributed's
LED is constituted；The multiple row LED and column prism of every group of LED light group constitute projection area, the picture numbers that every section of LED light group section is constituted
1-N, presses certain frequency checker, it is assumed that have K width view cyclical-transformations according to the instant speed of train, in t, vehicle correspondence
This group of LED light group should show Image (k, t)=[V*t/ ()] modK+1 width figures, [] represents that fractions omitted is rounded, mod
It is to take the remainder,Interpupillary distance is represented, V represents instant speed；
In t, Image (k, t) is shown by a certain section of LED light group section of this group of view, i.e., in t,J sections will
Display Image (k, t) image, wherein j=[V*t/ (/ N)] modN+1, i.e., along vehicle forward direction, every group of LED is divided into N
Section, sequence number 1-N, if jth frame shows 1,2 ... N, the frame of jth+1 shows 2,3 ... N, 1, the frame of jth+2 show 3,4 ... N, 1,
2 ... ... are converted by such rule so that light is maintained at image in observer's right and left eyes all the time not after column prism
Become, observer is it is seen that steady and audible still image or animation sequence.
Embodiment 2
As another preferred embodiment of the present invention, with reference to Figure of description 1 and 2, present embodiment discloses：
The present embodiment is a kind of auto-stereo display system for tunnel vehicle, and the system is vertically arranged in tunnel wall by equidistantly
LED light group and column prism composition on wall；When train operation instantaneous velocity changes, passenger is in the case of without wearing glasses
By column prism it is seen that stereo-picture.Every group of LED is made up of multiple row LED and corresponding column prism, every group of LED quilt
8 sections are divided into, each row LED shows the pixel from different views, and each pixel itself can just send trichromatic
Color, in varing proportions mixed luminescence.When a column prism is placed in before LED light group so that when head is moved, each eye is saturating
Cross prism and can only see one section of LED, eyes see adjacent column LED.One section of LED of the digitized representation of observer at the moment is through prism
The region of projection.It is assumed herein that observer can only move by a small margin in subway, it is front and rear to be no more than 3 meters, then by such focal length
The stereo optical system of Optical System Design ensure that the placement of column prism can be so that one section of LED illuminated area be just equal to
The double interocular distances of observer.During train high-speed mobile, the LED of equidistant arrangement is arranged because " visual persistence effect " can be remained in greatly
In brain vision, image digitization 1-8 is illustrated by certain frequency cyclical-transformation to specifications according to the instant speed of train so that light
The image that right and left eyes are maintained at after prism is constant all the time.In observer, LED projection region forms a scan line in the eyes；When
The frequency that LED is matched according to above-mentioned rule with speed is flashed luminous, and human eye is in 20 frame it is seen that clear and smooth animation sequence
Row, if opening stereo visual systems with 40,000 ms/h, now frame per second has been above 20 frames, and higher speed is matched higher
Frame per second, more links up.
Embodiment 3
As another preferred embodiment of the present invention, with reference to Figure of description 1 and 2, present embodiment discloses：
Prism tunnel motor vehicle space shows system, it is characterised in that：Including many on tunnel wall at a distance of f meters be vertically arranged
Group LED light group, one group of lamp group is divided into 8 sections, accommodates 4 width 1280*720 pictorial information（It is identical that right and left eyes are seen, so being 4
Width）, sequence number 1-8, roomy about f3Rice, each group of lamp is made up of the equal LED of u millimeters of spacing of multiple row length, every group of lamp group middle
Front is at a distance of f1Rice places column prism, and the vertical range of prism to human eye is f2Rice.Because the retentivity time of eye t of human eye is
0.05 second, interpupillary distance f4Averagely it is equal to 70 millimeters, numerous tunnel vehicles are derived by taking subway as an example here, subway speed of operation V
Take general 70,000 ms/h of value, interval f=V*t=0.97 meter, other tunnel vehicle average speeds faster, the general values of actually f
In the range of 1 meter to 5 meters, if f is smaller, the transformation period such as LED is smaller, because the light on and off of LED do not have afterglow effect, then draw
Face frame per second is higher, it appears that also more link up smooth.
Every group of lamp multiple row LED and column prism constitute projection area, and each row LED itself is as a pixel with regard to that can send
Trichromatic light, different proportion mixing sends the light of colors, shows the pixel from different views；
When a column prism is placed in before one group of LED, placed by above-mentioned parameter, when beholder arbitrarily moves on head, left and right eye
The light of one section of LED projection must only be seen through prism, because different sections are exactly interpupillary distance at projection area interval, eyes are seen
Adjacent segment LED；
The placement of column prism can cause the distance that one section of LED illuminated area is just equal between observer's eyes, because subway
About 2-3 meters of distance before and after interior scope of activities very little, and the stereo optical system designed according to above-mentioned parameter belongs to focal length system
System, optional position, can ensure that right and left eyes see different sections of LED projection region in the car；
During train high-speed mobile, rows of LED lights of equidistant arrangement are regarded because " visual persistence effect " remains in observer's brain
In feel, the picture numbers numeral 1-8 that every section of LED is constituted presses certain frequency checker according to the instant speed of train, wherein being
Speed is set to be measured by speed synchronous inductor.Image conversion frequency is dynamically adjusted according to instant speed, when vehicle velocity V * t are t
The distance of traveling is carved, if providing the change of K width image cycle altogether, then the image of subway this moment corresponding to position should show the
Image（k,t）=[V*t/(f4)] modK+1 width figures, [] symbol is the meaning that fractions omitted is rounded here, and mod is to take the remainder.Except
Know which piece image is t should be shown outside, also to obtain t by which section LED of lamp group to show Image (k, t), that
T LEDtJ sections will show Image (k, t) image, wherein j=[V*t/（f3/8）] mod8+1, it is both to advance along subway
Direction, every group of LED is divided into 8 sections of sequence number 1-8, if the i-th frame shows that 12345678, i+1 frames show that 23456781, i+2 frames show
The .. that shows 34567812 ... is converted by such rule so that light is maintained at the image of observer's right and left eyes after column prism
All the time it is constant, that is to say, that picture switching frequency is v1=[V/(f4)], each section of switching frequency of lamp group is v2= [V/(f3/ 8)],
Two kinds of frequencies are in f3, f4The fixed lower speed positive correlation of tunnel vehicle that is measured with synchronous inductor, when the km of speed 40/small
When, three-dimensional display system can be opened, if speed reaches that faster, picture is more smooth.
In observer, LED projection region forms a scan line in the eyes；The frequency matched as LED according to above-mentioned rule with speed
Rate flash it is luminous, human eye in 20 frame it is seen that clear and smooth animation sequence, if with 40,000 ms/h of unlatching stereoscopic visions
System, now frame per second have been above 20 frames, higher speed matches higher frame per second, more links up.
Column prism is installed in subway between the walls, being right against in the middle of lamp group by support support, parallel on wall
LED, light keeps eyes to see single two width figure simultaneously, image is in brain by column prism transmission to observer's eyes
The effect of compound stereoscopic.
Claims (6)
1. prism tunnel motor vehicle space shows system, it is characterised in that：It is many on tunnel wall including being equidistantly vertically arranged
Group LED light group, the spacing between two adjacent groups LED light group is, every group of lamp group middle front is apartPlace is provided with column
Prism, the column prism levels are set and parallel to LED light group, and column prism is apart from the vertical range of observer's eyes
；Be provided with light barrier above and below the column prism, column prism be arranged on above and below between two pieces of light barriers；Every group
LED light group is divided into N sections, and the width of every group of LED light group is, every group of LED light group is by a diameter of of multiple row equidistantly distributed's
LED is constituted；The multiple row LED and column prism of every group of LED light group constitute projection area, the picture numbers that every section of LED light group section is constituted
1-N, presses certain frequency checker, it is assumed that have K width view cyclical-transformations according to the instant speed of train, in t, vehicle correspondence
This group of LED light group should show Image (k, t)=[V*t/ ()] modK+1 width figures, [] represents that fractions omitted is rounded,
Mod is to take the remainder,Interpupillary distance is represented, V represents instant speed；
In t, Image (k, t) is shown by a certain section of LED light group section of this group of view, i.e., in t,J sections will be aobvious
Show Image (k, t) image, wherein j=[V*t/ (/ N)] modN+1, i.e., along vehicle forward direction, every group of LED is divided into N
Section, sequence number 1-N, if jth frame shows 1,2 ... N, the frame of jth+1 shows 2,3 ... N, 1, the frame of jth+2 show 3,4 ... N, 1,
2 ... ... are converted by such rule so that light is maintained at image in observer's right and left eyes all the time not after column prism
Become, observer is it is seen that steady and audible still image or animation sequence.
2. prism tunnel as claimed in claim 1 motor vehicle space shows system, it is characterised in that：The column prism is by supporting
Frame support is arranged between tunnel wall and vehicle, is right against in the middle of LED light group, the parallel LED light group with wall, light warp
Cross column prism and project observer's eyes, keep eyes to see the single view of at least two width simultaneously, image is synthesized in brain
Three-dimensional effect.
3. prism tunnel as claimed in claim 1 motor vehicle space shows system, it is characterised in that：The timely speed is to pass through
Speed synchronous inductor is measured.
4. prism tunnel as claimed in claim 1 motor vehicle space shows system, it is characterised in that：The timely speed of the vehicle。
5. prism tunnel as claimed in claim 1 motor vehicle space shows system, it is characterised in that：Every group of LED component
For 8 sections of LED light group sections.
6. prism tunnel as claimed in claim 1 motor vehicle space shows system, it is characterised in that：The two adjacent groups LED
Spacing between group。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710363476.5A CN107024776A (en) | 2017-05-22 | 2017-05-22 | Prism tunnel motor vehicle space shows system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710363476.5A CN107024776A (en) | 2017-05-22 | 2017-05-22 | Prism tunnel motor vehicle space shows system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262050A (en) * | 2019-07-03 | 2019-09-20 | 安徽工程大学 | The LED three-dimensional display screen device of super multiple views based on column mirror grating |
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