公开(公告)号：DE3381957D1

公开(公告)日：1990-11-29

申请号：DE3381957

申请日：1983-11-29

Applicant: IBM

Inventor： DAHL RICHARD EARL ,  FAFLAK DANIEL PAUL ,  SENDELBACH LEE ANTON

IPC: G09G5/22 ,  G09G1/00 ,  G09G5/00 ,  G09G5/10 ,  G09G5/28 ,  G09G5/32 ,  G09G1/16

Abstract: In an alphanumeric CRT display having normal/reverse video attribute, two timing circuits (1652, 1653) responsive to the raw video signal produce a modified video signal having two different dot durations and a switching circuit (1654) responsive to an attribute signal selectively enables one output of the two timing circuits (1652, 1653). In reverse mode, the character dots are made wider than in normal mode, to equalize the apparent width of the dots in the two modes.