Output Thomas W. Davis

What is Output? Output it data that has been processed into a useful form Output includes: Monitors Printers Speakers Etc.

Basic Categories Text Graphics Audio Video

Display Devices Display device: output device that visually conveys text, graphics, and video information Information is referred to as a soft copy Consist of a screen and the components that produce the information on the screen

Monitor Plastic or metal case that houses a display device as a separate peripheral Most mobile computers and devices integrate the display and other components into the same physical case Display may be color or monochrome

CRT Monitors A desktop monitor that is similar to a standard television because it contains a cathode-tube A cathode-ray tube (CRT) is a large, sealed glass tube

How the Display Works The screen is made of dots of phosphor material Each dot is made of red, green, and blue Three dots combine to form a pixel An electron beam moves back and forth across the back of the screen causing the dots to glow, producing an image

Monitor Sizes You measure monitor size diagonally from top left corner to bottom right corner This is divided into viewable size and actual size Determining the size of the monitor to purchase depends on the intended use

CRT Monitor Ergonomics Features that include: tilt-and-swivel base, brightness, contrast, positioning, height, and width controls ENERGY STAR program Encourages manufacturers to create energy efficient devices that use little energy when not in use

Quality of a CRT Monitor Depends on the resolution Describes the sharpness and clearness of an image Most monitors support a wide range or resolutions up to 1600 x 1200, with 800 x 600 the normal Also depends on dot pitch and refresh rate

Video Cards and CRT Monitors Video card: converts digital output from the computer into an analog video signal and sends the signal through the cable to the monitor, which displays output on the screen

Color Depth The number of bits a video card uses to store information about each pixel The greater the number of bits the better the image

Flat-Panel Displays Flat panel display is a display with a shallow depth that does not use CRT technology Includes monitors, LCD displays, gas plasma displays and HDTV

Flat-Panel Monitors Also called an LCD monitor, is a desktop monitor that uses a liquid crystal display rather than a cathode-tube to produce images

Advantages to a Flat- Screen Take up less desk space, called footprint Uses one-third the power of a CRT monitor Produces less heat Does not produce radiation

LCD Technology Liquid crystal display (LCD) uses a liquid compound to present information on a screen Produce color using either passive- matrix or active-matrix technology LCD quality is measured in the same manner as CRT display quality is measured

Gas Plasma Displays A display that uses gas plasma technology, which substitutes a layer of gas for the liquid crystal material in a flat panel monitor When voltage is applied, the gas releases UV light causing pixels on the screen to glow

Televisions and HDTV Displays Digital televisions have two major advantages Digital signals produce a higher-quality picture Many programs can be broadcast on a single digital channel HDTV: is the most advanced from of digital television

Printers A printer is an output device that produces text and graphics on a physical medium Produce hard copies of data

Impact Printers Impact Printer: form characters and graphics by striking a mechanism against an inked ribbon that physically contacts the paper Types: DOT-MARTIX Printer Line Printers

Nonimpact Printers Nonimpact printers: forms characters and graphics on a piece of paper without actually touching the paper Types: Ink-Jet Photo Printers Laser Printers Thermal Printers Portable Printers

Speakers and Headsets Audio output device: a component of a computer that produces music, speech or other sounds

Faxes Machines and Fax Modems Fax machine: short for facsimile machine, is a device that transmits and receives documents over telephone lines. Fax modem: allows the user to send and receive electronic documents and faxes.

Multifunction Perpheral A single device that looks like a copy machine but provides the functionality of a printer, scanner, copy machine, and a fax machine

Data Projectors A device that takes the image from computer screen and projects it onto a larger screen LCD Projector Digital Light Processing Projector