| 摘要 |
<p>PURPOSE:To call an operator's attention, and also to detect easily a character by a light pen, by constituting so that a line width of only a character which can be detected by the light pen becomes thick. CONSTITUTION:A display item of a CRT character display device is selected by a light pen, and a serial video signal of a regular character width inputted to an input terminal 1 is delayed by a delay circuit 4. When a light pen switch signal of an input terminal 2 is off, an AND circuit 5 is closed, and this delay signal is not inputted to an OR circuit 6, a video signal of the input terminal 1 is outputted as it is, and becomes a video signal for displaying a regular character. When said switch signal is on, the delayed video signal is inputted to the OR circuit 6, brought to OR with the original video signal, a display time of the video signal becomes long, and a line width of a display character on a CRT display becomes thick.</p> |
