公开(公告)号：MX157298A

公开(公告)日：1988-11-11

申请号：MX20549985

申请日：1985-06-03

Applicant: IBM

Inventor： BACKEY DARWIN PRESTON ,  SEANS JESUS ANDRES ,  YOSIM PAUL STEWART

IPC: G09G5/18 ,  G06F3/153 ,  G09G1/16 ,  G09G1/28 ,  G09G5/00 ,  G09G5/02 ,  G09G5/04 ,  G09G5/36 ,  H02M7/529 ,  G06K9/62

Abstract: A digital display system includes a monitor arranged to receive digital display data and synchronising signals to develop displays on a cathode ray tube. The monitor is switched between different line structure and/or colour definition modes in response to the polarity of one of the vertical or horizontal synchronising signals trains. A circuit receives this train to provide control signals to the horizontal time base and/or a colour signal code converter. The time base control signal, in accordance with its binary value, controls the frequency of the time base. The colour converter, in response to the control signals, either passes colour signals received in parallel over six input lines without change to the cathode ray tube drive circuits or converts colour signals on four of the input lines to output signals on the six lines to the drive circuits.