| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to adjust a display screen from an input device such as a keyboard and to accurately obtain a display state that a user requires. SOLUTION: When the user inputs a control instruction for adjusting the display screen of a display device 1b from a keyboard connected to a computer body 1a, a control signal superposing circuit 16 generates a control signal corresponding to the control instruction and superposes it on a vertical blanking period of a video signal or synchronizing signal generated by a display control circuit 15. A control signal extracting circuit 18 extracts the superposed control signal from the video signal or synchronizing signal from the control signal superposing circuit 16 and outputs it. A display control circuit 19 generates an adjustment signal according to the control signal from the control signal extracting circuit 18 to adjust a video circuit 20 and a deflecting circuit 21. COPYRIGHT: (C)2004,JPO&NCIPI |
