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US 3,944,999 AGranted
Colour display apparatus
AssigneeInternational Computers Limited
InventorJohn Richard Moore
Life of this patent
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Abstract
A Colour Display Apparatus comprises a three-gun cathode ray tube modulated by an input video signal from a digital computer. The video signal contains digital colour codes in the portions of the signal which correspond to blank spaces in the display (e.g. spaces between rows of characters). These codes are stored in a circulating shift and are used to gate the video input to the appropriate combination of guns to produce the required colour for each symbol.
Claims6
Colour display apparatus for displaying a plurality of rows of information separated by spaces which apparatus comprises:
- a display device scanned in a raster pattern, the said rows of information comprising a plurality of raster lines and the said spaces each comprising at least one raster line;
- means for modulating an input signal onto at least the portions of the raster pattern corresponding to the said rows of information;
- sampling means for deriving a sequence of digital colour codes from the input signal during each period the raster pattern scans one of the said spaces between the rows of information;
- register means for storing each of the said sequences of colour codes as it is derived;
- means for reading out the colour codes from the register means, one at a time, in synchronism with the receipt of the portion of the input signal corresponding to the following row of information;
- and means for controlling the colour of the display in response to the colour code currently being read out from the register means.
3 more elements
Dependencies are inferred from the claim text.