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Computing > Output devices > Flashcards

Output devices Flashcards

1
Q

Output device

A

A device that allows the user to view/hear data from a computer system

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2
Q

Inkjet printer

A
  1. rollers are automatically feeds paper through the printer
  2. a moving print head which consists of nozzles moves across the paper via stepper motor and belt
  3. nozzles spray ink onto the paper from a cartridge filled with liquid ink(cyan, yellow, magenta and black)
  4. different coloured inks are mixed to create the colours
  5. technology can be piezoelectric or thermal bubble
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3
Q

Thermal bubble

A
  1. Behind hundred of print nozzles are tiny resistors that create heat
  2. ink is heated, vaporised and forms tiny bubbles
  3. as bubble expands, ink pushes through nozzle and is ejected onto paper
  4. As it cools and condenses, bubble collapses and draws in fresh ink
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4
Q

Piezoelectric crystal

A
  1. At rear end of each ink reservoir of each nozzle is a piezoelectrical crystal
  2. when the crystal receives a small electric current, it begins to vibrate in and out
  3. As it vibrates inwards, ink is ejected onto paper
  4. As it vibrates outwards, new ink is drawn in to replace it
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5
Q

2 advantages of thermal bubble

A

less expensive

possible to use more print nozzles

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6
Q

3 disadvantages of thermal bubble

A

produces larger droplets
only certain inks can be used because of high heat
more maintenance needed because of high temp

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7
Q

3 advantages of Piezoelectrical crystal

A

precise, smaller ink drop sizes
wide range of ink types can be used
can run longer because less heat is generated

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8
Q

2 disadvantages of Piezoelectrical crystal

A

more expensive

uses fewer print heads

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9
Q

Printer interrupt

A

signals sent to processor which cause it stop to service the interrupt

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10
Q

Printer driver

A

software that converts data to be printed in a form specific to given printer

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11
Q

Printer bufffer

A

temporary memory which stores data until it is ready to be uses

allows processor to carry out other tasks whilst slow printing process continues in background

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12
Q

Laser printer

A
  1. uses toner(powdered ink)
  2. drum is positively charged
  3. laser reverses the charge on parts of the drum to create an image of the page to be printed
  4. the positively charged toner stick to the negatively charged parts of the drum
  5. the toner is transferred to the paper
  6. the toner is fused by heated rollers
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13
Q

2 advantages of inkjet printer

A

cheap to buy

print on many media types

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14
Q

3 disadvantages of inkjet printer

A

frequent ink changes needed
noisy
ink is expensive

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15
Q

4 advantages of laser printer

A

larger ink cartridges
cost per page is less
quieter
faster

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16
Q

3 disadvantages of laser printer

A

produces particulates and ozone gas
maintenance is expensive
physically larger

17
Q

3d printer

A

used to create 3 dimensional objects from 3d computer model

computer model created by 3d scanner or CAD software

additive manufacturing - layering material from ground up

18
Q

5 uses of 3d printer

A 
prosthetic limbs
reconstructive surgery
food
parts for items no longer in production
prototyping
19
Q

2D cutter

A

cutting holes or shapes into flat 2d surface

uses x-y plane

20
Q

3d cutter

A

cutting holes or shapes into flat 3d surface
rotates and cuts at many angles
uses x-y-z plane

21
Q

Speakers and headphones

A

digital data is sent from computer to DAC where it is converted into analogue signal
signal is boosted using amplifier and is sent to speaker

22
Q

Actuator

A

electromechanical device
e.g. motor, relay or solenoid
responsible for moving and controlling system or mechanism
used in many control applications involving sensors and microprocessors

23
Q

Liquid crystal display screen

A
  1. Uses fluorescent lamp as backlighting
  2. Contains groups of red, green and blue light filters to form each pixel
  3. Liquid crystals are manipulated to allow different amount of fluorescent back light through individual RGB filters at front of screen
24
Q

Light Emitting Diode screens

A
  1. Uses small LED bulbs to provide light

2. crystals are manipulated to block/ let light through to individual RGB filters at the front of the screen

25
Q

7 advantages of LED screens

A

allows delocalised dimming of screen( because can’t be turned off)
produces deeper blacks
reach maximum brightness quickly
sharper image with more realistic colours
thinner
more reliable -last indefinitely
consume little power(produce little heat and lower costs)

26
Q

Organic Light-Emitting Diode screens

A
  1. When an electric field is applied to the electrodes they give off light
  2. Electrons flow from the cathode to the positive anode
  3. Holes represent space for a missing electron
  4. When the holes meet electrons they cancel each other out and emit energy in the form of light
  5. A set of red, green and blue OLEDs work like a LCD pixel
  6. No backlight
27
Q

6 advantages of OLED

A 
thinner and lighter
made of plastic - flexible
brighter light is emitted
generate own light so no need for complexity of backlighting
larger field of view
faster refresh rate
28
Q

3 disadvantages of OLED

A

increased production cost
OLED layers wear out 4x faster
affected by water and other contaminants

29
Q

LCD projector

A
  1. lamp light is split from white into red, green and blue using dichroic mirrors
  2. RGB light channels are passed through separate LCD screens, one for each of 3 colours
  3. The screens determine how much RGB is present in final image
  4. RGB light is then reassembled into single light beams
  5. Magnified out of projector using lenses
30
Q

Digital light projectors

A
  1. Strong white light passes through colour filters on rapidly spinning wheel
  2. This converts light into red, green or blue light
  3. DLP micro chip has millions of mirrors that correspond to a single pixel
    - tilted towards light = one
    - tilted away light = off
  4. The mirrors switch between on and off thousands of times a second, creating different and changing shades of grey light
  5. The coloured light and grey is combined to create different colours
  6. The image is projected

Computing (23 decks)

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