WO2011151044A2  Method and arrangement for threedimensional representation  Google Patents
Method and arrangement for threedimensional representation Download PDFInfo
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 WO2011151044A2 WO2011151044A2 PCT/EP2011/002654 EP2011002654W WO2011151044A2 WO 2011151044 A2 WO2011151044 A2 WO 2011151044A2 EP 2011002654 W EP2011002654 W EP 2011002654W WO 2011151044 A2 WO2011151044 A2 WO 2011151044A2
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 time
 projection screen
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 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
 H04N13/00—Stereoscopic video systems; Multiview 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
 H04N13/312—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers the parallax barriers being placed behind the display panel, e.g. between backlight and spatial light modulator [SLM]

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
 H04N13/00—Stereoscopic video systems; Multiview 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
 H04N13/305—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using lenticular lenses, e.g. arrangements of cylindrical lenses
Abstract
Description
Method and arrangement for the spatial representation
The invention relates to the field of threedimensional representation, especially the spatially perceptible without auxiliary display for multiple viewers simultaneously, the socalled autostereoscopic visualization.
For some time approaches exist on the above field. A pioneer in this field was Frederic Ives, of a system with a "line screen" presented in Scripture GB190418672 to 3D representation. Further, in the writing of Sam H. Kaplan "Theory of parallax barriers", Journal of SMPTE 59 , No 7, pp 11 21, July 1952 basic findings on the use of barrier screens for 3D display described.
However, long time succeeded in widespread use were autostereoscopic systems. Only in the 80 years of the 20th century a renaissance of 3D systems was able to use due to the nowavailable computing power and novel display technologies. In the 90 years the number of patent applications and publications soared to glassesfree 3D visualizations literally in the air. Outstanding results were achieved by the following inventors or suppliers:
In JP 8331605 Ikeda Takashi et al describes. (Sanyo) a step barrier in which comprises a transparent barrier element has approximately the size of a colored subpixel (R, G or B). With this technique, it was possible, the most autostereoscopic systems due to the simultaneous display of several (at least two, preferably more than two views) partially convert lay loss of resolution occurs in the horizontal direction and the vertical direction. The disadvantage here, as with all barrier methods of high light loss. In addition, the stereo contrast changes in lateral movement of the observer of almost 100% to about 50% and then again rising to 100%, resulting in a fluctuating in viewing space 3D image quality. Pierre Allio succeeded with the teaching of US 5,808,599, US 5,936,607 and WO 00/10332 a remarkable advancement of lenticular technology, in which he also uses a subpixelbasierte view layout. Another outstanding R & D result was registered with the EP 0791 847 EP patent by Cees van Berkel (Philips). Here are relative to the vertical lenticular lenses inclined on a display that also shows different perspective views. N characteristic views on at least two display lines are divided here, so that, again, the loss of resolution is partially folded from the horizontal to the vertical.
Several milestones for the Autostereoscopy founded Jesse Eichenlaub with the documents US 6, and WO 02/35277 157.424 and several other inventions, but are almost all 3D systems for only one viewer and / or often can not be produced at acceptable cost.
With DE 10003326 C2 Armin Grasnick et al succeeded. 4D vision in advancing the barrier technology in terms of twodimensional structured wavelength selective filter arrays for creating a 3D impression. However, a disadvantage here is opposite to a 2D display greatly reduced brightness of such 3D systems.
Armin Schwerdtner (Seereal Technologies) managed by WO 2005/027534 a new technological approach for all (usually two) views fullyresolution 3D representation. However, this approach is associated with high adjustment effort and for larger screen sizes only extremely difficult to implement (from about 25 inches).
Finally Wolfgang Tzschoppe et al reported. (X3D Technologies), WO 2004/077839 A1, which relates to an improved in brightness barrier technology. Based on the approach of a stepped barrier of JP 08331605 and DE 10003326 a particular duty cycle of the transparent will be presented to the opaque barrier filter elements here, which is greater than 1 / n with n the number of views displayed. However, the disclosed in this document configurations and gauges generate a greatly limited depth perception in most cases because the stereo contrast verglichen about the teaching of JP 08331605 is greatly reduced.
The invention has for its object a possibility for autostereoscopic display to create in order to achieve improved visibility for the same number of viewers. Under improved visibility is particularly, but not exclusively, to an improved resolution at the same time the highest possible stereo channel separation to understand. Corresponding methods and arrangements are to be industrially feasible and at the same time without the need of 3D glasses offer several viewers a spatial image. Furthermore, a method for a very high resolution twodimensional representation to be provided.
This object is inventively achieved by a method for threedimensional representation, comprising the steps of
 front or back projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen in timesequential order and in a defined resolution of pixels x (i, j) in row i and column j .
temporally sequential, partial shading of each picture element x (i, j) on the projection screen, so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein, in the projection of an arbitrary but fixed view a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k =. 1 do not overlap .n solid pairs (i, j) and k different on the projection screen,
 T so that an observer with both eyes, at least partially provides mapping of the surface portions (k, i, j) in n directions at least from at least one viewing position image information of different views, so that a spatial perception. Preferably, the timesequential, partial shading is implemented by a flat light valve such as a liquid crystal Hutter, which is located in the immediate vicinity of the projection screen and that the projected light (sequentially in time and in synchronization with the projection of the views A (k) only to subareas T k, i, j) can pass.
In other words, the invention first utilizes the fact that some reflective imager projection technology are particularly fast, such as DMDs or fLCOS chips or similar. By virtue of such a fast reflective imager is projected in the first variant of the back on a projection screen sequentially in a series of at least two views A (k). According to the invention, a shutter or similar optical device is now arranged in front of or behind the projection screen, which only leaves per pixel (in this case, fullcolor per pixel) a portion visible. That leaves at any time the full resolution five visible, but the pixel no longer have the full fill factor on.
Alternatively, the timesequential, partial shading can be realized by an optomechanical system, for example a rotating surface with a reflective surface that at least partially with an opaque pattern
ID is provided, which the projected light only to part surfaces T (k, i, j) maps sequentially in time and in synchronization with the projection of the views A (k). Such a rotating surface, the function of a color wheel still the same (as with DLP projectors usual), so the Aufmodulation of color take over. Furthermore, such an optomechanical system can be useful in two parts
form 15: Then, for example, a mirror wheel would modulate the color and ensure that the other mirror wheel due to the opaque pattern of the patch image. Both mirrors wheels must not necessarily operate at the same rotational frequency. 0 The figure of the surface portions (k, i, j) in at least n directions, for example by means of a lenticular screen, a lenticular screen, a parallax barrier, a holographic optical element (HOE), a prism raster, a structured surface and / or a diffraction pattern carried out T , Other configurations are possible.
5 Alternatively, it is possible that the mapping of partial areas T (k, i, j) is at least in n directions by means of a dynamic look, for example, a timevarying lens raster is performed. Of course, then a suitable synchronization with the various state modes of the lens array with the illustrated respectively per unit time views A (k) must be ensured.
D
The object of the invention is also achieved by an arrangement for the spatial representation comprising
 a projection unit for the front or rear projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen in timesequential order and in a defined resolution of pixels x (i, j) in row i and column j,
Means for temporally sequential, partial shading of each picture element x (i, j) on the projection screen, so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein when projecting an arbitrary but fixed view a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k is = 1..n solid pairs (i, j) and k different on the screen do not overlap,
 means for mapping the surface portions T, so that an observer with both eyes, at least partially provides image information of different views (k, i, j) in n directions at least from at least one viewing position, so that a spatial perception.
The partial surfaces T (i, j) [but not T (k, i, j)] to some extent correspond to pixels, which are divided into k portions, and reflect which successively k time of the different sections image information of different views A (k).
The means for temporally sequential, partial shadowing consist of a flat light valve such as a liquid crystal Hutter, which is located in the immediate vicinity of the projection screen and that the projected light (sequentially in time and in synchronization with the projection of the views A (k) only to subareas T k, i, j) can pass.
Optionally, the light coming from projection screen must be depolarized light or unpolarized are generated, to the shutter happen.
Alternatively, the means for temporally sequential, partial shading can be made of an optomechanical system, for example a rotating surface with a reflective surface that is at least partially provided with an opaque pattern which sequentially in time and in synchronization (with the projection of the views A k) k, i, j) imaging the projected light only to part surfaces T (. Such a rotating surface, the function of a color wheel still the same (as with DLP projectors usual), so the Aufmodulation of color take over. Furthermore, it may be useful to train such optomechanical system in two parts: Then for example, a mirror wheel would modulate the color and ensure that the other mirror wheel due to the opaque pattern, the patch image. Both mirrors wheels must not necessarily operate at the same rotational frequency.
5
The means for imaging the surface portions T (k, i, j) in at least n directions consist for example of a lenticular screen, a lenticular screen, a parallax barrier, a holographic optical element (HOE), a prism raster, a structured surface and / or a diffraction pattern , The ID period widths of the abovementioned optical elements can come from the pixel width of a surface portion T (i, j) up to a multiple width of a partial area (i, j) in question.
In particular embodiments, the means for imaging the part surfaces can 15 T (k, i, j) in at least n directions consist of a dynamic look, for example a timevarying lens frame. Of course, then a suitable synchronization with the various state modes of the lens array with the illustrated respectively per unit time views A (k) must be ensured. D Advantageously, the projection beam path can be folded by the projection unit to the screen. Particularly advantageous in this case the means for folding the beam path bear at least partially on the operation of means for temporally sequential, partial shading and / or for operation of the means for imaging the surface portions T (k, i, j) in at least n directions at.
5, the flat configuration of a screen based on the projection is possible for example using the teaching of WO9953375 or WO0163356.
The projection screen may be a front projection screen in particular embodiments, which glows for a few milliseconds. Hierzu0 example could be a timedelayed (eg afterglow) screen used so that the views are emitted each in different directions, ie from which they come. In the representation of a sufficient number, for example 30, views A (k) can be reduced unpleasant transitions of the views A (k) for head movement of the viewer. Finally, the application of the inventive concept also provides another arrangement for highresolution twodimensional display, comprising
once a projection unit for the front or rear projecting at least two pairs of disjoint subsets A (k) and the same image with k = 1..n and n> 1 on a projection screen in timesequential order and in a defined resolution of pixels x (i , j) in row i and
J columns,
Means for temporally sequential, partial shading of each picture element x (i, j) on the projection screen, so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein always the same with the projection of an arbitrary but fixed subset a (k)
Partial area T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k = 1..n solid pairs (i, j) and different k do not overlap the projection screen,
so that A (k) of the image are temporally sequentially visible to an observer all pairwise disjoint subsets, and thereby a highresolution
2D image is displayed.
The subsets A (k) replace the views in this regard. the subsets are advantageous respectively turned from strip and the same view AO composed, in each case, for example, every nth columns of a view AO, are taken beginning with the kth column, in each case a subset of A (k).
The invention will be described in greater detail with reference to embodiments. In the drawings:
Fig. 1 shows the schematic setup for implementing the invention
process
Fig. 2 and Fig. 3 respectively the schematic structure in the inventive method at two different points in time, and FIG. 4 is a scheme for forming an optomechanical system for use in the inventive method.
All drawings are not to scale. This applies particularly to 5 degree angle, if any.
First, therefore, Figure 1 shows the schematic setup for implementing the method.
The exemplary illustrated method of the invention for the spatial representation
ID comprises the steps of
Back projecting two views A (k) with k = 1 ..2 from a projector 3 onto a projection screen 1 in timesequential order and in a defined resolution of pixels x (i, j) in row i and column j,  timesequential , partial shading of each picture element x (i, j) on the
15 projection screen 1 so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein, in the projection of an arbitrary but fixed View A (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k = 1 ..n solid pairs (i, j) and different k on the projection screen 1
ZD not overlap,
Mapping the subareas provides T (k, i, j), so that a viewer 5 with both eyes L and R at least partly in at least 2 directions from at least one viewing position image information of different views A (1) and A (2), so that a spatial perception is created.
25
The temporally sequential, partial shading is realized here by means of a flat light valve 2, for example a liquid crystal Hutter, which is located in the immediate vicinity of the screen 1 and which sequentially in time and in synchronization with the projection of the views A (k) the 30 projected light only to partial surfaces can happen T (k, i, j).
The figure of partial areas T (k, i, j) in at least n = 2 directions is performed, for example by means of a lenticular screen. 4 Other configurations are possible. In Fig. 2 and Fig. 3 shows the schematic structure in the inventive method is shown at two different time points, respectively. The circled number "1" and "2" indicates respectively that the view 1 and 2 are again in full resolution at the respective time of the projector. 3 Accordingly, the light valve 2 is in
5 as connected in its columns that in each case one half of a partial area T (i, j) transparent, and the other is opaque. Thereby, on the screen 1, only a corresponding part of the surface portions T (i, j), and therefore the partial surfaces T (1, i, j) and T (2 i, j) with image information of the views A (1) or . A (2) acted upon. About the picture by means of the lenticular lenses 4 is thus ensured that the
I0 view A (1) only the left eye L and the view A (2) reaches only the right eye R. The inventive method and so to speak, the drawings may be modified with k = 1..n and for n> 2 views A (k).
Finally Fig. 4 shows a scheme for forming an optomechanical
15 system 6 for use in the inventive method. Here, the timesequential, partial shading in place of a light valve can be realized 2 through an optomechanical system 6, for example a rotating surface with a specular surface that is at least partially provided with an opaque pattern which sequentially in time and in synchronization with der0 projection of the views A (k) (k, i, j) imaging the projected light only in partial areas T. Such a rotating surface 6 can simultaneously function as a color wheel yet (as with DLP projectors usual), so the Aufmodulation of color, do not assume, as in Figure 4 by the letters R, G, B (Red, Green and Blue) indicated. This is achieved by the use of color (R, G, B) reflektierenden5 mirrors or surfaces. At the same time as described above also, the opaque pattern is present, as indicated in Figure 4 at the lower portion of the redreflecting surface on the Farbspiegelrad. 6 The pattern provides the appropriate partial shading in the frontdescribed sense. The Farbspiegelrad rotates at a timing of the image of the views A (k) synchronenD speed so that each view A (k) is projected in true color.
The drawings can also be used for the illustration of the inventive arrangements accordingly. Figure 1 would then accordingly understood as an arrangement for threedimensional display, comprising  a projection unit 3 to the front or rear projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen 1 in a timesequential sequence and x in a defined resolution of picture elements (i, j) in row i and column j,
Means 2 for temporally sequential, partial shading of each picture element x (i, j) on the screen 1 so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein when projecting an arbitrary but fixed view a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k =. 1 .n solid pairs (ij) and different k do not overlap on the screen 1,
Means 4 for imaging of the surface portions (k, i, j) so that 5 at least partially provides T in at least directions of n from at least one viewing position, a viewer with two eyes image information of different views, so that a spatial perception.
To avoid repetition, it is omitted here to the appropriate presentation to the other drawings.
The advantages of the invention are versatile: in particular, a resolution of the SD image, and a good brightness becomes possible. Henceforth need not be moved to the imager of the projection system (Imager as DMD or LCOS), and there are, apart from a possible color wheel also generally no moving components are present.
Claims
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Citations (12)
Publication number  Priority date  Publication date  Assignee  Title 

GB190418672A (en)  19030917  19041027  Frederic Eugene Ives  Improvements in the Process of Making Line Composite Stereoscopic Photographs. 
JPH08331605A (en)  19950530  19961213  Sanyo Electric Co Ltd  Stereoscopic display device 
EP0791847A1 (en)  19960223  19970827  Philips Electronics N.V.  Autostereoscopic display apparatus 
US5808599A (en)  19930505  19980915  Pierre Allio  Autostereoscopic video device and system 
WO1999053375A1 (en)  19980408  19991021  Jan Hess  Transverse projector 
WO2000010332A1 (en)  19980813  20000224  Pierre Allio  Method for autostereoscopic display 
US6157424A (en)  19980330  20001205  Dimension Technologies, Inc.  2D/3D imaging display 
DE10003326A1 (en)  20000125  20010809  4D Vision Gmbh  Method and arrangement for the spatial representation 
WO2001063356A1 (en)  20000222  20010830  Jan Hess  Transverse projector with multiple light deflection 
WO2002035277A1 (en)  20001024  20020502  Dimension Technologies, Inc.  Autostereoscopic display 
WO2004077839A1 (en)  20030226  20040910  X3D Technologies Gmbh  Stereoscopic display method and arrangement 
WO2005027534A2 (en)  20030826  20050324  Seereal Technologies Gmbh  Autostereoscopic multiuser display 
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JP4934974B2 (en) *  20050317  20120523  エプソンイメージングデバイス株式会社  Image display device 
DE602005022406D1 (en) *  20050323  20100902  Thomson Licensing  An autostereoscopic display device comprising zeitsequentiellem method 
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Publication number  Priority date  Publication date  Assignee  Title 

GB190418672A (en)  19030917  19041027  Frederic Eugene Ives  Improvements in the Process of Making Line Composite Stereoscopic Photographs. 
US5808599A (en)  19930505  19980915  Pierre Allio  Autostereoscopic video device and system 
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JPH08331605A (en)  19950530  19961213  Sanyo Electric Co Ltd  Stereoscopic display device 
EP0791847A1 (en)  19960223  19970827  Philips Electronics N.V.  Autostereoscopic display apparatus 
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WO1999053375A1 (en)  19980408  19991021  Jan Hess  Transverse projector 
WO2000010332A1 (en)  19980813  20000224  Pierre Allio  Method for autostereoscopic display 
DE10003326A1 (en)  20000125  20010809  4D Vision Gmbh  Method and arrangement for the spatial representation 
DE10003326C2 (en)  20000125  20020418  4D Vision Gmbh  Method and arrangement for the spatial representation 
WO2001063356A1 (en)  20000222  20010830  Jan Hess  Transverse projector with multiple light deflection 
WO2002035277A1 (en)  20001024  20020502  Dimension Technologies, Inc.  Autostereoscopic display 
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Title 

SAM H. KAPLAN: "Theory of parallax barriers", JOURNAL OF SMPTE, vol. 59, no. 7, July 1952 (19520701), pages 11  21, XP000645716 
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