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US 4,165,506 AGranted
Control unit for the brightness of video signals on a raster scan display
AssigneeHollandse Signaalapparaten B.V.
InventorsAntoon H. Brands, Jouke Gietema
Life of this patent
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Abstract
A control unit for the brightness of video signals on a raster scan display is provided with a random-access memory. The data stored in each element of this memory determines the brightness of the video signals on the raster scan display at a position corresponding with this element. In response to the video data supplied to the control unit and the brightness data in the random-access memory a logical unit provides new brightness data which overwrites the brightness data in the memory.
Claims10
A control unit for a raster scan display comprising:
- a random access memory comprising a plurality of elements each containing only the brightness data associated with a video signal to be displayed at a predetermined position on the raster scan display corresponding to the memory address of said element;
- a readout circuit connected to said memory which functions to provide a memory address to said memory and to read out said data at the corresponding one of said memory elements and present a corresponding video signal on the raster scan display;
- switching means connected to said memory which function to alternately supply the memory with an address pertaining to data in one of said memory elements to be modified, and with an address provided by the readout circuit pertaining to data in one of said memory elements required to be read out of said memory;
- and
- a logical unit connected to said switching means and said memory which functions to independently overwrite the data in ones of said elements of said memory.
2 more elements
Dependencies are inferred from the claim text.