The Components of the system unit

The Components of the system unit

Output 1 5 r ap te C h Output Output is any data that has been .processed into a useful form Output Device is any hardware component that conveys information to one or more .people 2

5 r ap te C h Display) 1 Devices Is an output device that visually conveys text, graphics and . video information Desktop Computer typically use a monitor as their display device. Monitor is a display device that is packaged as a separate

3 5 r ap te C h Display Devices Monitor controls allow users to adjust the brightness, contrast, positioning, height, and width . of images Most mobile computer and devices integrate the display and other components into the same physical case.

Display device usually show text, graphics and video 4 5 r ap te C h Display Devices 5 5 r ap

te C h Display Devices Some PDAs and other mobile device use monochrome displays because they require .less battery power :Types of display device include LCD monitors and screens. Plasma monitors. 6 5 r ap te

C h LCD monitors and Screens Is a desktop monitor that uses a liquid crystal display to produce . images also called a flat panel 7 5 r ap

te C h LCD and Screens :Its available in a variety of sizes With the more common being 15, 17, 18, 19, 20, 21 and 23 inches- some are 30 or 40 inches. Notebook computer screen size 14.1, 15.4 and 17 inches. Tablet screen range from 8.4 to 14.1 inches. 8 5 r

ap te C h LCD Technology and Quality Resolution Resolution is the number of horizontal and vertical pixels in a display device. A higher resolution uses a greater number of pixels and this provides a smoother, sharper, and clearer image. As the resolution increases Try it! 9

10 C h ap te r 5 5 r ap te C h LCD Technology and Quality

Response time Response time of an LCD is the time in milliseconds (ms) that it takes to turn a pixel on or off. LCD response times range from 8 to 25 ms. The lower the number, the faster the response time. 11 5 r ap te C h LCD Technology and Quality

Brightness of LCD is measured in .nits A nit is a unit of visible light intensity. The higher the nits, the brighter the images. 12 5 r ap te C h LCD Technology and Quality :Pixel pitch

Some times called dot pitch, is the distance in millimeters between pixels on a display device. Average pixel pitch on LCD should be .28 mm 13 5 r ap te C h Ports and LCD

monitors A cable on monitor plugs in a port on the system unit. LCD monitors use a digital signal to produce a picture. To display the highest quality images, an LCD monitor should plug in a DVI ( digital Video Interface) port. HDMI TO DVI DVI enables digital signals CABLE to transmit directly to an LCD 14 5 r ap te C

h Plasma Monitors Is a display device that uses gas plasma technology, which sandwiches a layer of gas between two glass .plates Large business users or power users sometime have plasma monitors , which often measure more than 60 inches wide. Plasma monitor offer larger screen size & higher display quality than LCD monitors but are more expensive. These monitor also can hang directly on a wall. 15

5 r ap te C h CRT Monitors Is a desktop monitor that contains a .cathode-ray tube Cathode-ray tube (CRT) is a large sealed glass tube. The front of the tube is the screen. CRT available in

16 17 C h ap te r 5 5 r ap te C h

Printers . 2 Is an output device that produces text and graphics on a physical medium such as paper or .transparency film Many different printers exist with varying speed, capabilities and .printing method :There are two type Nonimpact Printer such as Ink-jet, Photo, Laser, Thermal, 18 5 r ap te C

h :Type of printer Nonimpact Printers . 1 Forms characters and graphics on a .piece of paper without striking Some nonimpact printers spray ink, while others use heat or pressure .to create images 19 5 r ap te C h

A . Ink-Jet Printers Is a type of nonimpact printer that forms characters and graphics by spraying tiny drops of liquid ink .onto a piece of paper Produce text and graphics in both black and white and color on a variety of paper 20 5 r ap te

C h Ink-Jet Printers Resolution is measured by the number of dots per inch (dpi) a printer can print. Most ink-jet can print from 600 to 4800 dpi. The speed of it is measured by the number of pages per minute (ppm) it can print. Most ink-jet print from 3 to 26 ppm. 21 5 r ap te

C h B . Photo Printers Is a color printer that produces photo-lab.quality pictures Some photo printers print just one or two size of images, for example, 3X5 inches and 4X6 inches. Many photo printers 22 5 r ap te

C h C . Laser Printers Is a high-speed, high-quality .nonimpact printer :Printer speeds For home and small office --Black & white text .Color (4 to 27 ppm)), to 50 ppm 15 ( For large business users print more than 150 ppm. Color laser printers are slightly higher price than otherwise 23 5 r ap

te C h D . Thermal Printers Generates images by pushing electrically heated pins against .heat-sensitive paper Basic thermal printers are inexpensive, but print quality is low and images tend to fade over time. 24 5 r

ap te C h E . Mobile Printers Is a small, lightweight, batterypowered printer that allows a mobile user to print from a notebook computer, tablet PC, PDA, or smart .phone while traveling Mobile printers fit easily in a briefcase alongside a notebook computer. 25 5 r ap

te C h F . Plotters and LargeFormat Printers Plotters are sophisticated printers used to produce high-quality drawing such as blueprints and maps. Used in specializes fields such as engineering and drafting and usually are very costly. 26 5

r ap te C h Other output devices Speakers. Headphones. Earphones. Fax machines and Fax modems. Multifunction peripherals. Data projectors. 27 5 r ap te

C h Speakers, Headphones, and Earphones Audio output device is a component of a computer that produces music, speech or .other sounds Most personal computers have a small internal speaker that usually emits only low-quality sound. Many PC users add surround sound speakers to their 28 5

r ap te C h Speakers, Headphones, and Earphones Speakers typically have tone and volume controls, allowing users to adjust settings. In many cases, users connect the speakers to ports on the sound card. 29

5 r ap te C h Speakers, Headphones, and Earphones Users can plug headphones or earphones in a port on the sound card, in a speaker, or in the front of the system unit. With headphone or earphones, only the individual wearing the

30 5 r ap te C h Fax Machines and Fax Modems Fax Machines is a device that codes and encodes documents so they can be transmitted over telephone lines. The document can contain text, drawings or photographs, or can be handwritten.

The term fax refers to document that you send or receive via a fax 31 5 r ap te C h Fax Machines and Fax Modems Many computers includes fax capability by using a fax modem. fax modem transmit computerprepared documents or documents that have been digitized with scanner or digital camera. Fax modem transmits these faxes to a fax machine or to another fax

modem. 32 5 r ap te C h Multifunction Peripherals Is a single device that looks like a copy machine but provides the functionality of a printer, scanner, copy machine, and .perhaps a fax machine Some use color ink-jet printer technology, while others include a black-and-white

laser printer. An advantage of these device is they are significantly less expensive than if you purchase each device 33 5 r ap te C h Data Projectors Is a device that takes the text and images displaying on

a computer screen and projects them on a larger screen so an audience can see the image clearly. Some data 34 Homework Choose two output devices (listed previously) in lecture (or- you may find something was not discussed). Make a comparison between these devices : speed? Price? Quality or services ? Connectivity ? Provide photos of the devices 35

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