Presentation on theme: "Output Devices. Output devices allow us to receive information from the computer system Monitor (LCD and TFT) Speakers Plotter Printers (Inkjet and."— Presentation transcript:
Output devices allow us to receive information from the computer system Monitor (LCD and TFT) Speakers Plotter Printers (Inkjet and Laser) Output Devices
Used to display data using a screen There are two types of monitor, LCD and TFT Monitor
Liquid Crystal Display (LCD) Flat screen Consists of a thin layer of fluid between two sheets of plastic Can be colour or black and white Used in: Calculators palmtop computers Laptops ultra-thin computer monitors
Thin Film Transistor (TFT) Flat screen Consists of one transistor for every pixel Has better quality (sharper pictures and better colours) than LCD Used in: Laptops Flat screen monitors
Printers are devices that produce a hard copy of the output from a computer. Output can be: Black & White (Monochrome) or Colour There are two types of printer: Laser Inkjet Printers
A type of printer that uses toner and a laser beam to print images onto paper Laser Printer Toner is a powdery substance. The laser “draws” the image inside the printer. A high temperature inside the printer makes the toner “stick” to the paper in the right places as the paper passes through the printer.
A type of printer that sprays tiny streams of coloured ink (like paint) onto paper through tiny holes in the print head. Inkjet Printer A print head is a small part of the printer that moves backwards and forwards as the paper passes through the printer.
Inkjet vs Laser You need to be able to compare inkjet and laser printers in terms of their speed, resolution, initial cost and running cost Speed (Measured in pages per minute - ppm) Inkjet – slow, Laser – fast Resolution (Measured in dots per inch – dpi) Inkjet – high, Laser – very high Initial Cost (The cost to buy the printer) Inkjet – cheap, Laser – expensive Running Cost (The cost to buy ink/toner) Inkjet – expensive, Laser - cheap
Used for accurate drawings/designs on paper Paper can roll backwards and forwards Uses special pens to print on rolls of paper Used by architects Plotter
Used to output sound Headphones are “personal” speakers Speakers/Headphones
Specialised Output Devices for Virtual Reality User wears a headset which contains a screen and headphones.