What is Light Pen?
| LightPen Input Device |
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A light-sensitive input device shaped like a pen, used to draw on the computer screen or to make menu selections. As the tip of the light pen makes contact with the screen, it sends a signal back to the computer containing the x-y coordinates of the pixels at that point. Light pens can be used on any size screen. Lightpens give the user the full range of mouse capabilities, without the use of a pad or any horizontal surface. Users can interact more with the application, in such modes as drag and drop, or highlighting. Lightpens target specific pixels, while touch screens activate finger-sized "buttons". Pens offer more active and accurate interaction between the user and the system. In older touch screen systems, the effects of ageing, normal drift, or adjustments made by the user can move the active area away from the displayed image ('Button'), causing repeated attempts by the user to get the program to work. |
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