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Display control apparatus

  • US 4,485,378 A
  • Filed: 12/10/1981
  • Issued: 11/27/1984
  • Est. Priority Date: 12/11/1980
  • Status: Expired due to Fees
First Claim
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1. A display control apparatus for controlling operation of a display including a relatively large number of picture elements arranged both in vertical and horizontal directions and displaying a minimum unit of display data having a relatively small number of picture elements both in the vertical and horizontal directions, said display control apparatus comprising:

  • display data storage means for storing a plurality of said minimum units of display data to be displayed by said display,means for generating read address data for designating addresses of data to be read from the data stored in said display data storage means,means for generating write address data for designating addresses for writing in said display data storage means the display data of said minimum units of display data,means for periodically generating a signal representing a minimum unit period, said minimum unit period being representative of a time required for one of said minimum units of display data to be displayed by said display,means responsive to said minimum unit period representing signal for generating a latch enabling signal in a latch period within said minimum unit period and having a predetermined phase relative to said minimum unit period representing signal,write data supply means for supplying said minimum units of display data,writing means responsive to said write data for writing the same into said display data storage means as addressed by said write address data in a writing period contained within said minimum unit period but excluding the latch period such that said writing period and said latch period do not overlap, andlatch means responsive to said latch enabling signal for latching said minimum units of display data read from said display data storage means as addressed by said read address data and for supplying said display with said minimum units of display data.

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