Back to results
US 4,727,362 AGranted
Digital display system
AssigneeInternational Business Machines Corporation
InventorsDarwin P. Rackley, Jesus A. Saenz, Paul S. Yosim
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeInternational Business Machines Corporation
InventorsDarwin P. Rackley, Jesus A. Saenz, Paul S. Yosim
Estimating the term…
A digital display system includes a monitor arranged to receive digital display data and synchronizing signals to develop displays on a cathode ray tube. The monitor is switched between different line structure and/or color definition modes in response to the polarity of one of the vertical or horizontal synchronizing signals trains. A circuit receives this train to provide control signals to the horizontal time base and/or a color signal code converter. The time base control signal, in accordance with its binary value, controls the frequency of the time base. The color converter, in response to the control signals, either passes color signals received in parallel over six input lines without change to the cathode ray tube drive circuits or converts color signals on four of the input lines to output signals on the six lines to the drive circuits.
A digital display system including a computer display adapter for generating color signals in parallel form and horizontal and vertical synchronizing pulses, and a display monitor for generating a raster scan display on a cathode ray tube in response to said signals and pulses, said monitor including control circuit means responsive to positive-going and negative-going vertical synchronizing pulses for providing first and second control signals respectively, and a horizontal time base generator coupled to receive said control signals for operation at first and second frequencies in response respectively to said first and second control signals whereby the line structure of the raster scan display varies in accordance with the polarity of vertical synchronizing pulses generated by said adapter.
A digital display system including a display monitor coupled to receive parallel digital color signals and horizontal and vertical synchronizing pulse trains from a computer display adapter to develop a raster scan display on a cathode ray tube, comprising control circuit means in the monitor, responsive differentially to positive-going and negative-going vertical synchronizing pulse trains to generate respective control signals for switching the frequency of horizontal time base generator means and thereby altering the line structure of the display.
Dependencies are inferred from the claim text.