output device Flashcards
output devices
take data produced from comp - turns to human readable form
most common form of printer
Inkjet
operating costs of inkjet printers
printer itself cheap
ink cartridge high
many inkjet printer not print black and white page if colour cartridge runs out
laser printers
use toner
fast and reliable
excellent print quality
dot matrix printer
prints dots to form letters
used where multipart stationary required
works effective in damp, dirty atmosphere
noisy, poor print quality, expensive
3d printer
prints using plastic filament, powdered resin, ceramic, metal powder of paper
use of 3d printer
produce solid objects that actually work
3d printers in medicine
can make prosthetics or orthotics
reconstructive surgery or general surgery
pros of 3d printers in medicine
cheaper to make prosthetics using 3d printers
greater accuracy
can produce accurate parts for surgical procedures
use of 3d printers in manufacturing and art
can make parts for cars
can make parts for old cars whose parts arent made anymore - just need the blueprint
this is cheaper
prototypes for design fashion and art - can save costs
dangers 3d printing
can be used to make guns
RFID - radio frequency ID
example of I/O device
use transponder and receiver
powered receiver emits radio frequencies
transponder antenna becomes energised by the radio waves
transponder can then send data to receiver
uses of RFID tags
security
tracking of shipments
banking, fast payment systems
can be replacement for barcode systems
passive tags
passive transponders - no power source. rely on radio waves from receiver for their energy
transponders need to be placed very close to receiver
e.g of passive tag - bank cards
active tag
use large battery powered beacon which can broadcast signal to receivers 300m away
useful for larger items not placed on receiver by hand
can be used in shipping, warehousing
Actuators
motors commonly used with sensors to control a mechanism
loudspeakers and headphones
digital data sent from comp to digital to analogue converter (DAC) where converted to analogue signal
signal then boosted by amplifier and played thru speaker
LCD monitors - Liquid crystal display
contain groups of red, green, blue diodes to form each pixel
has a backlight which uses cold cathode flourescent lamps or LEDS
OLED
much thinner lighter than LCD/LED
screens made of plastic, makes them flexible
light emitted from OLED system much brighter than LCD/LED system
benefits OLED tech
generate their own light - no need for backlighting
low pwr consumption so good for mobile devices
little heat produced
larger Field of view than LCD screens
LEDs versus CCFLs
reach max brightness immediately
sharper images, more realistic, vivid colours
brighter lights
leds are small, allows for thin screens
last almost indefinitely
consume very little pwr, little heat, reduce running costs
better blacks
multimedia light projectors
compact, high res, full colour projectors
inputs data from comp, DVD/CD player or storage device
