Television – Video display – Projection device
Patent
1997-01-07
1998-10-13
Lee, Michael
Television
Video display
Projection device
348756, 348203, 353 31, H04N 931
Patent
active
058220224
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a video system for displaying a video picture composed of image points, whose color values and/or brightness values can be stored sequentially, according to a first set of parameters with predetermined parameter values containing number of lines, number of image points, line frequency and frame frequency as parameters, in an image storage which can be read out in accordance with a second set of parameters with different or identical parameter values for the parameters for displaying the stored video picture by means of a display device.
2. Description of the Related Art
Video systems of this type are known, e.g., from DE 29 38 349 A1. This reference describes a circuit arrangement for increasing resolution and for preventing flickering and an image storage with a video picture which is read out again at twice the speed.
Another application of image storages is known from DE 41 39 842 A1. This reference describes a video system by which the video picture is projected by means of lasers. Since the light intensity of the lasers is low, the received video picture is divided into partial areas in an image storage and these partial areas are imaged by means of different laser projectors.
Such image storages can also be used, for example, for converting from one standard to another, the aforementioned parameter sets being determined by the standard of the input signals and output signals. Including the high-resolution systems currently under development, the standards are substantially as follows: PAL, PAL PLUS, PAL 50-Hz frame frequency, PAL 100-Hz frame frequency, HDTV, HD-MAC, NTSC, and MUSE.
Generally, the possibility of storing video pictures with a given standard in an image storage and reading them out of the image storage for display with a different standard is very limited, since TV systems must use a picture tube adapted specifically to a standard and the number of lines as well as the aspect ratio of different systems relative to one another can change. This limitation becomes especially apparent in color television, since images can only be shown with a resolution determined by an aperture mask in the picture tube. This is also true for LCD projectors in which the density of image points is given by the structure of the LCD matrix to be projected.
Therefore, it has so far been impossible to construct a video system which can receive images in different standards and also display them in optional different standards.
OBJECT AND SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a video system which receives signals of a video picture on the input side in accordance with a first set of parameters corresponding to a specified standard and displays this image according to a different, second set of parameters for displaying images which is determined by the same or by a different optional standard.
Proceeding from the prior art mentioned above, this object is met in that the display device contains an individual light source which can be controlled in accordance with the color values and/or brightness values of the image points and whose light bundle can be projected onto a picture screen via an optical system, wherein the optical system has a raster scanning device by which the light bundle can be directed onto the picture screen on optional points within an image field for displaying the video picture of suitable dimensions and for which a raster control is provided for rastering the light bundle in accordance with the second set of parameters.
The video system according to the invention differs from the prior art mentioned above in that every optional point on the picture screen can be illuminated for display by means of the light bundle so that, according to the invention, there is no limitation imposed, for example, by aperture masks or LCD matrices. Further, aperture masks for generating different colors can be dispensed with according to the invention because the rastered light bu
REFERENCES:
patent: 3639684 (1972-02-01), Levine
patent: 4931874 (1990-06-01), Gillon et al.
patent: 5424771 (1995-06-01), Yu
patent: 5614961 (1997-03-01), Gibeau et al.
Deter Christhard
Hofmann Gerhard
Hubrich Dieter
LDT Gmb&H Co. Laser-Display-Technologie KG
Lee Michael
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