Question

10 points of a light pen​

Answer 1

Answer:

• A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display.

• It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.
• A light pen can work with any CRT-based display, but its ability to be used with LCDs was unclear (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan[1]).

• A light pen detects changes of brightness of nearby screen pixels when scanned by cathode-ray tube electron beam and communicates the timing of this event to the computer.
• Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the pen's position from the latest timestamp.

Answer 2

Answer:

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