DISPLAY CONTROLLER

PURPOSE:To improve the system processing efficiency by using plural display control parts including the ruled line producing circuits. CONSTITUTION:The output signals 211 and 212 of both display control parts 1 and 2 are switched alternately by a switching circuit 10 for each cycle of a dot clock signal DOTCLK 208 and turned into a signal 205. This signal 205 is converted into an analog signal by a D/A converting circuit 11 and displayed on a CRT display 12. In a display mode of character font data, the font data is divided regularly into even and odd data by a parallel/serial converting circuit 8. These even and odd data are converted independently into parallel data 21 and 22 and supplied to the parts 1 and 2. The circuit 10 switches alternately the output data 211 and 212 of both parts 1 and 2 in response to the odd and even picture element data displayed on a screen respectively. Thus both data 211 and 212 are displayed on the display 12.