Television – Stereoscopic – Stereoscopic display device
Patent
1997-04-28
1999-05-11
Britton, Howard
Television
Stereoscopic
Stereoscopic display device
349 15, H04N13/04;15/00
Patent
active
059033045
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention is directed to a process for generating a stereoscopic video picture by means of partial images for the left eye and for the right eye of an observer, these partial images emitting light with different polarization states oriented orthogonally relative to one another, wherein the observer perceives the stereoscopic video picture through spectacles with eyepieces which filter the respective polarization state of the light. The invention is further directed to a device for generating a stereoscopic video picture by means of partial images for the left eye and for the right eye of an observer, these partial images emitting light with different polarization states oriented orthogonally relative to one another, wherein the observer perceives the stereoscopic video picture through spectacles with two eyepieces which filter the respective polarization state of the light.
b) Description of the Related Art
The representation of three-dimensional images is desired for the future development of video technology not only because of increased entertainment value in television, but also because three-dimensional pictures can be used as design aids in computer aided design, since the designed element can be observed directly and two-dimensional views with auxiliary lines for hidden edges are dispensed with.
There are essentially two methods to be distinguished in the known prior art for representing three-dimensional video pictures. In the first method, the three-dimensional pictures are imaged as plane sectional images in a plurality of planes arranged one behind the other. The second method makes use of the fact that an observer only recognizes a three-dimensional picture in that he observes an object through both eyes from different viewing angles. By using this second method (stereoscopy, as it is called), two pictures detected from different viewing angles are presented to the left eye or right eye so that the object shown on the pictures is perceived three-dimensionally by the observer's brain as is customary in normal vision. The stereoscopic process uses special spectacles which filter the two pictures out of an overall picture and present these pictures to the left eye or right eye of the observer.
The imaging of three-dimensional pictures in a plurality of picture planes in accordance with the first method is described in WO 79/00308 A1 and EP 0 311 843 A2. Special spectacles are not used in this type of image generation. However, three-dimensional pictures shown in this way require a substantially greater amount of information than would be required for the transmission of only two pictures separately for the left eye and right eye. Therefore, it is not expected that these devices will be put to general use in video and television technology in the near future.
The second method, that of generating stereoscopic images, is also used in the process and device mentioned in the introduction. Two partial images are generated with different polarization states orthogonal to one another and are superimposed. Spectacles worn by the observer then filter out the partial image for the left eye and the partial image for the right eye via polarizing filters.
Processes and devices of this type are known from DE 39 10 420 A1, EP 0 328 357 A2, DE 36 07 629 C2, DE 32 01 837 A1, and DE 32 14 327 A1. In order to represent two pictures, one for each eye of the observer, picture tubes are used as is conventional in television technology. By means of polarizing filters located in front of a picture tube, the polarization of the image emanating from the light, depending upon the partial image represented, is either changed alternately or partial images generated on two picture tubes are projected upon one another after filtering the picture with different polarization. The observer wears spectacles with two polarizing filters filtering out different polarization states; the polarizing filters allow one of the partial images to pass through for each eye. If two part
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Britton Howard
LDT GmbH & Co. Laser-Display Technologie KG
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