291994
Description
Mind Map by lhunter792, updated more than 1 year ago
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Created by lhunter792
over 10 years ago
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Output device
- Dot Matrix Printers
- How? The print head contains a
grid of pins and different
combinations of pins are pushed
out to form different characters.
The print head then hits a carbon
ribbon leaving an impact on the
paper
- Strengths: cheap and
reliable/ Limitations: poor
quality, slow and noisy
- How? The print head contains a
grid of pins and different
combinations of pins are pushed
out to form different characters.
The print head then hits a carbon
ribbon leaving an impact on the
paper
- Ink-jet Printers
- How? Operate by heating
the ink as it flows through a
set of tiny nozzles. The
hearting process causes a
small droplet of ink to form.
This is then released as a
single dot which forms part
of a letter or image
- Strengths: Cheap, reliable and good
quality print outs Limitations: Slower
than Laser, cant do bulk printing but
good for home and small office use
- How? Operate by heating
the ink as it flows through a
set of tiny nozzles. The
hearting process causes a
small droplet of ink to form.
This is then released as a
single dot which forms part
of a letter or image
- Laser Printers
- How? The print head contains a laser
which emits a beam of light. A spinning
multi-faced mirror directs the beams in a
horizontal line across a rotating drum. On
rotation the Drum picks up powdered ink
‘Toner’ which is then fused onto paper by
heat and pressure.
- Strengths: Fast, reliable and high quality print
outs,relatively cheap, quiet and handle bulk printing/
Limitations: more expensive than ink-jets, toner
cartridges are expensive
- How? The print head contains a laser
which emits a beam of light. A spinning
multi-faced mirror directs the beams in a
horizontal line across a rotating drum. On
rotation the Drum picks up powdered ink
‘Toner’ which is then fused onto paper by
heat and pressure.
- Plotters
- How? Plotters are a specialist type of printer which
is able to draw high quality images on very large
pieces of paper. They are used by engineers,
architects and map-makers to draw plans of
buildings, diagrams of machines or large scale
maps. A plotter uses a pen, ink-jet or a chemical/
electrostatic charge.
- Pen: Strengths: least expensive/
Limitations: slow and some functions don't
work
- Ink-jet: Strengths:quiet and produce more
details output than pen
- Electrostatic: Strengths: Very high resolution
outputs and fastest of the three/ Limitations: use
very expensive chemicals
- How? Plotters are a specialist type of printer which
is able to draw high quality images on very large
pieces of paper. They are used by engineers,
architects and map-makers to draw plans of
buildings, diagrams of machines or large scale
maps. A plotter uses a pen, ink-jet or a chemical/
electrostatic charge.
- CRT VDU- Cathode
Ray Tube Visual Display
Unit
- How? DCA convertor used it
recieves information in the form of
different voltage levels for each of
the primary colours then this
determines the colour of each pixel.
- Strengths: Cheaper than LCD, high resolution
and colour / Limitations: Large, not portable
- How? DCA convertor used it
recieves information in the form of
different voltage levels for each of
the primary colours then this
determines the colour of each pixel.
- LCD Monitors (Liquid
Crystal Display)
- How? Made up of multiple
layers each performing an
important function. Light is
passed though a polarised
filter that only allows through
light waves that are
vibrating horizontally. They
then pass through a layer of
liquid crystal cells They are
arranged in a matrix and
shown on screen. The light
passes through the 2
primary colours then
through another polarised
filter allowing light waves
vibrating vertically.
- Strengths: Light,
adaptable, small space,
can be used for portable
devices, can run on
battery/ Limitations:
Image quality can be
poor, quite expensive
- How? Made up of multiple
layers each performing an
important function. Light is
passed though a polarised
filter that only allows through
light waves that are
vibrating horizontally. They
then pass through a layer of
liquid crystal cells They are
arranged in a matrix and
shown on screen. The light
passes through the 2
primary colours then
through another polarised
filter allowing light waves
vibrating vertically.
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