公开(公告)号：EP0146229A3

公开(公告)日：1988-05-11

申请号：EP84307140

申请日：1984-10-17

申请人： SPERRY CORPORATION

发明人： Hancock, William Ray ,  Johnson, Michael John

IPC分类号： G09G01/16

CPC分类号： G09G1/002 ,  G09G1/146

摘要： An apparatus for expanding illuminated picture elements in a CRT display (91) utilises an image memory (93) wherein video bit signals are written into only addresses whose binary x coordinate has a predetermined first digit, and whose binary y coordinate has a predetermined first digit.Signals in addresses (92) corresponding to picutre elements P I,J ; P I-1,J ; P I-1, J+1 ; and P I,J+1 are read from the image memory, and a Boolean OR sum signal (94) is generated therefrom which is converted to an analogue signal (95). The picture element P I,J is illuminated in response to an analogue signal representing the Boolean OR sum signal 1.