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What is pointing device part 2What is pointing device? Input Devices - Light Pen - Digitizer - Stylus and CursorLight Pen Light pen is another pointing input device. It can detect presence of light. It is a handheld pen shaped device with a photocell mounted at its frontend. When the frontend of the pen is touched with the monitor screen, the photocell detects or senses a position of display screen. This device also has button. The user points the object to be selected on the screen with light pen and then presses the button on the pen. Light pen devices are used by engineers, graphic designers etc. these devices require special monitors. Light pen is used in Personal Digital Assistant and other types of handheld computers. The electric light pen input device is generally used with designing software. In designed display screen data can be entered with a light pen by pointing the screen positions. A spot appears on the display screen at the location where pen is touched and it is sensed by the photocell. The computer program controlled the input signal of this device. Digitizer A Digitizer also known as Graphic Tablets. It is a flat, rectangular electronic plastic board (or pad). Each location on the digitizer points to corresponding computer screen. It is mainly used for making maps and engineering drawings. The input devices stylus and puck (or cursor) is used to trace drawings and sketches on the digitizer. When you draw on digitizer with the help of a stylus or cursor, it converts the movements of stylus or cursor into digital signals that are later sent into the computer. Thus digitizer makes it easy to enter free-hand drawing in the computer. Stylus and Cursor Stylus is ballpoint like pen. It is used to write text or draw lines (or to create sketches and images) on a specially designed graphics screen or digitizer. Stylus is known as Electronic Pen. Stylus used in some advanced graphics systems is known as Digital Pen. Typically digital pen provides more functionality than stylus. Stylus is used in graphic applications such as Computer-Aided Design (CAD) and engineering drawings etc. It has the capability of erasing text or lines. Some personal computers and mobile computers or devices use touch screens that allow to input data as well as to make selections on the screen using a stylus or digital pen. PDAs use stylus and tablet PCs typically use digital pen. These computers or devices use special software called Character Recognition. This software translates hand written letters and symbols into a form that the computers can use and process them. The cursor is an input device. It is also use to trace drawings and sketches on a graphic tablet or digitizer. It looks like a mouse, except it has a window with crosshairs, so the user can see through to the digitizer. Cursor is also referred to as Puck. Read previous part of this article: Click here See Also or Related Articles:
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