1.5 Output Devices Flashcards

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1
Q

Output devices

A

Take data produced by a computer and turn it into a human-readable form

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2
Q

Inkjet operating costs

A
  • The inkjet printers are sold at or below production cost
  • Ink cartridges are dramatically marked up
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3
Q

Laser Printers

A
  • Use dry powdered ink called toner
  • Print quality is excellent
  • Fast and reliable
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4
Q

Dot matrix printers

A
  • Strike an inked ribbon which imprints dots to form letters on the page
  • Useful where multi-part stationery is required
  • Can work effectively in damp or dirty atmospheres
  • Noisy, poor print quality and expensive to buy
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5
Q

3D printers

A

Print 3D objects

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6
Q

Applications of 3D printers

A
  • Manufacturing of prosthetic limbs or orthotics
  • Reconstructive surgery or general surgery
  • Manufacturing parts for cars
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7
Q

Dangers of 3D printing

A

Blueprints of dangerous things could be distributed online

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8
Q

RFID (Radio Frequency ID)

A
  • Use a transponder and receiver
  • The powered receiver emits radio frequency and energy
  • The transponder antenna in the bank card, mobile phone or tag becomes energized by radio waves
  • The transponder can then send data to the receiver
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9
Q

Uses of RFID tags

A
  • Security control points or identification of people, animals goods or valuables
  • Shopping and supply chain traking for goods
  • Banking and fast-payment systems
  • As a potential replacement for barcode systems
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10
Q

Passive Tags

A
  • Passive transponders used in bank cards for example, have no power source themselves and rely on the radio waves from the receiver for their energy
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11
Q

Active Tags

A
  • Use a larger, battery powered beacon which can broadcast its own signal to receivers up to 300m away
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12
Q

Actuators

A

Motors that are commonly used in conjunction with sensors to control a mechanism (opening a valve or door, starting a pump, turning a wheel o fan, moving an aircraft aileron)

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13
Q

DAC

A

Digital to analogue converter to convert digital data into analogue signal which is boosted using an amplifier and then sent to a speaker

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14
Q

LCD (Liquid Crystal Display)

A
  • Contain groups of red, green and blue diodes to form each pixel
  • Require backlighting using Cold Cathode Fluorescent Lamps (CCFL) or LEDs as the crystals act as a light valve and do not emit light themselves
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15
Q

LEDs vs CCFLs

A
  • LED reach their maximum brightness almost immediately
  • Image is sharper with more realistic and vivid colours
  • Produce a brighter and light, which leads to better picture definition
  • Since LEDs are very small, this allows the screens to be much thinner in construction
  • LEDs last almost indefinitely which makes the screens much more reliable
  • LEDs consume very little power and therefore produce very little heat as well and reduce running costs
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16
Q

OLED (Organic LED screens)

A
  • Much thinner and lighter than traditional LCD or LED screens
  • Plastic, rather than glass also makes them flexible
  • Light emitted from OLED is much brighter than LCD or LED
17
Q

Benefits of OLED

A
  • Generate their own light so there is no need for complex backlighting
  • Much less power is consumed; good for battery operated devices
  • Little heat is produced, reducing fire risk
  • Have a larger FOV than LCD screens, and is further enhanced when the screen is curved
18
Q

Multimedia light projectors

A
  • Compact, high-resolution, full-colour projectors
  • Can project text, images, video and audio content
  • Typically the projector will be ale to input data from a computer, DVD/CD player or storage