Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1981-07-20
1985-02-05
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340799, 340781, 340721, 358153, 358240, G09G 312
Patent
active
044980817
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This application is based on, and claims the benefit of, PCT International Application PCT/JP 80/00172, filed July 25, 1980.
This invention relates to a display device in which display elements are arranged in matrix form to provide an immense screen service, for instance, as the score board of a baseball field, and for motion pictures wherein graphic patterns such as characters and animations are displayed on the screen, as seen in television sets, while being edited on the screen as desired.
BACKGROUND ART
It is well known in the art that a display device having a screen provided by arranging incandescent lamps in matrix form may be used as the score board of a baseball field or a stadium or on an advertising pillar. In some display devices, pictures are displayed as seen in television sets. Also in some display devices, characters, messages and pictures are displayed in superposition. In this case, in general, in a conventional display device of this type, character data and a video signal are mixed to provide a composite video signal (including synchronizing signals), and the composite video signal is stored in a frame memory, and is then processed as required for display. Accordingly, the editing operation is troublesome, taking a lot of time.
SUMMARY OF THE INVENTION
In this invention, a video data memory for storing a video signal obtained from a composite video signal, as much as one frame of a display screen, and a graphic data memory for storing a graphic signal (including a character signal) as much as one frame of the display screen, which is displayed solely or in superposition on a picture are provided independently, so that the two signals are inputted or provided independently of each other in time relation, and accordingly in generation of graphic messages it is unnecessary to take the synchronization with the video signal into account.
Furthermore, for the video data memory and the graphic data memory, a video mode memory and a graphic mode memory are provided to control the operations of reading data out of the video data memory and the graphic data memory for each of display areas in suitable size which form the entire display screen, respectively. Therefore, the screen can be readily divided into picture display portions and graphic display portions.
In addition, a blanking memory having a capacity corresponding to one frame is provided which blanks the data reading operation of the video data memory or the graphic data memory for each of the display elements. Therefore, when a picture is superposed on graphs or characters, the readability of the graphs or characters can be improved, for instance, by blanking around the characters.
Thus, pictures, graphs and characters can be readily arranged and combined, or edited, on the display screen.
BRIEF DESCRIPTION OF THE DRAWING
The single FIGURE in the accompanying drawing is a block diagram showing one example of a display device according to this invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The single FIGURE is a block diagram showing one example of a display device according to this invention. In the FIGURE, reference character (1) designates a composite video signal in which a vertical synchronizing signal and a horizontal synchronizing signal in addition to a video signal are combined; that is, it is a signal from a broadcast station or VTR TV camera, (2A) a synchronizing separator circuit for separating the horizontal synchronizing signal, the vertical synchronizing signal, odd and even number status signals and the video signal from the composite video signal (1), (2B) a chrominance demodulator circuit for obtaining red, green and blue color signals from the separated video signal and delivering them in the form of analog signals in a parallel mode, (3) an A/D (analog-to-digital) converter for converting the color signals, i.e. the analog signals, into digital signals, (4) a write control circuit for producing in synchronization with the horizontal and vertical synchronizing signals from the
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Fukushima Nobuo
Tomimatsu Noriyuki
Curtis Marshall M.
Mitsubishi Denki & Kabushiki Kaisha
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