Prepared by :
Sandeep R. Rathod
Guided by :
Sanket patel1
Various types of display and printers
INDEX
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Segment displays
Seven Segment displays
Fourteen & sixteen segment display
Full area 2-dimensional displays
2-dimensional displays include
Cathode ray tube
Plasma display panels (PDP) Liquid Crystal Display
What is display devices …?
• Display device that forms an image by converting
electronic signals from the input into points of colored
light on the screen.
isplay devices are used for the visual
presentation of information.
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Various types of display and printers
Display devices
Types Of Display Devices
Segment displays
Full-area 2-dimensional
Displays
Three dimensional
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Segment displays
• Some displays can show only digits or alphanumericcharacters.
• They are called segment displays, because they are composed of several segments that switch on and off to give appearance of desired glyph (is an element of writing).
• The segments are usually single LEDs or liquid crystals.
• They are mostly used in digital watches and pocket calculators.
• There are several types:
• Seven segment display (most common, digits only)
• Fourteen segment display - Sixteen segment display10/9/2014 5
Various types of display and printers
Seven segment display A seven-segment display (SSD), or seven-
segment indicator, is a form of electronicdisplay device for displaying decimal numerals
& ALPHABETICAL CHARACTERS (a tof).
The segments of a 7-segment display arereferred to by the letters A to G, as shown to theleft, where the optional DP decimal point (an"eighth segment") is used for the display of non-integer numbers
A single byte can encode the full state of a 7-segment-display. The most popular bitencodings are GFEDCBA and ABCDEFG - bothusually assume 0 is off and 1 is on.
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Fourteen & sixteen segment display
It is an extension of the more common
seven-segment display, having an additional
four diagonal and two vertical segments with
the middle horizontal segment broken in
half. The sixteen-segment display breaks all
three horizontal segments in half.
Example diagram of 14-segment display.
Note unbroken top and bottom segments in
comparison with a sixteen-segment display.
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Full area 2-dimensional
displays
• 2-dimensional displays that cover a full area
(usually a rectangle) are also called video
displays, since it's the main modality of presenting
video.
Full-area 2-dimensional displays are used in, for
example:
Applications :-
1. Television sets
2. Computer monitors 10/9/2014 8Various types of display and printers
2-dimensional displays include
• Cathode ray tube
• Plasma display panels (PDP)
• Liquid crystal display (LCD)
• HPA display
• Thin-film transistor displays (TFT)
• Light-emitting diode display (LED)
• Laser TV (forthcoming)
• Carbon nanotubes (experimental)
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Cathode ray tube
One of the earliest electronic displays is the cathode ray tube
(CRT), which was made commercial in 1922.
The CRT consists of an electron gun that forms images by firing
electrons onto a phosphor-coated screen. The earliest CRTs were
monochrome and were used primarily in oscilloscopes and black
and white televisions.
The first commercial colour CRT was produced in 1954.CRTs
were the single most popular display technology used in television
sets and computer monitors for over half a century; it was not
until the 2000s that LCDs began to gradually replace them.10/9/2014 10Various types of display and printers
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Plasma display panels (PDP)
• A plasma display panel (PDP) is a type of flat paneldisplay common to large TV displays 30 inches (76 cm)or larger.
• They are called "plasma" displays because thetechnology utilizes small cells containing electricallycharged ionized gases, or what are in essencechambers more commonly known as fluorescent lamps.
• Plasma display screens are made from glass, whichreflects more light than the material used to make anLCD screen.
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Liquid Crystal Display
• A liquid crystal display (LCD) is a flat panel display,electronic visual display, video display that uses the lightmodulating properties of liquid crystals (LCs). LCs do notemit light directly.
• They are used in a wide range of applications, includingcomputer monitors, television, instrument panels, aircraftcockpit displays, signage, etc.
• They are usually more compact, lightweight, portable,less expensive, more reliable, and easier on theeyes.They are available in a wider range of screen sizesthan CRT and plasma displays.
• LCDs are more energy efficient and offer safer disposalthan CRTs. Its low electrical power consumption enablesit to be used in battery-powered electronic equipment.
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• It is an electronically modulated optical device made up
of any number of pixels filled with liquid crystals and
arrayed in front of a light source (backlight) or reflector to
produce images in color or monochrome.
• There are two types of lcd.
• HPA display
• Thin-film transistor displays (TFT)
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LED display
• An LED display is a flat panel display, which uses light-emitting diodes as a video display.
• A LED panel is a small display, or a component of a largerdisplay.
• LED panels are sometimes used as form of lighting, for thepurpose of general illumination, task lighting, or even stagelighting rather than display.
• Usually LED displays radiate red, orange, yellow or greenlight.
• They have a wide operating temperature range, areinexpensive, easily interfaced to digital logic, easilymultiplexed, do not require high voltages and have fastresponse time.
• The viewing angle is good and display of arbitrary numbers ofdigits is easily assembled. 10/9/2014 16Various types of display and printers
The Largest LED Television Display
• 2011 UEFA Champions League final match between
Manchester United and Barcelona was broadcasted live on
EKTA screen. And EKTA’s Ukrainian produced 3D Led
TV makes The Guinness Book of World Records.
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Three dimensional
• Swept-volume Display
• Vary focal Mirror Display
• Emissive Volume Display
• Laser Display
• Holographic Display
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What is printers ? An external hardware device responsible for taking
computer data and generating a hard copy of that
data. Printers are one of the most commonly used
peripherals and they print text and still images on
the paper.
The idea of a computer printer was first introduced
by Charles Babbage in the mid 1800’s, but his idea
was never created at that time due to lack of
funding and support.
But in 1985 a team of engineers working for the
science museum in London found his plans and
decided to make his printer, they finished making it
in 1991.
Babbage's Printer
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Types of printers
• There Are Two Types Of Printers.
1. Impact printers
1. Dot matrix printers
2. Line printers
2. Nonimpact printers
1. Ink-jet printers
2. Laser printers
3. Thermal printers
4. Plotters and Large-Format Printers
5. Special-purpose printers
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Impact printers
• Dotmatrix printers
1. Was invented in 1971.
2. Small dots form characters
3. Continuous form paper
4. More pins on print head means higher quality
5. Speed measured in characters per second (cps)
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Impact printers
Line printers
1. High speed
2. Prints an entire line at a time
3. Band printer
4. matrix printer
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Non-Impact printers• No mechanism strikes the paper
• Much quieter than impact printers
• Ink-jet printers
• Nozzles spray ink
• Spray tiny drops of ink onto the paper
• Both black-and-white and color
• Resolution measured in dots per inch (dpi)
• Speed measured in pages per minute (ppm)
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Non-Impact printers
• Laser printers
• High-speed, high-quality nonimpact printer
• Very high quality resolution - 600dpi to 1,200 dpi
• Stores entire page before printing it
• Page description language (PDL)
• PCL (Printer Control Language)
• Postscript
• Operates much like a copy machine
• Replace cartridge
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Laser printers
More expensive than inkjet or impact printers
Use lasers as a light source
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Thermal printers
• Pushes electrically heated pins against heat-sensitive
paper
• Thermal wax-transfer printer
• Dye-sublimation printer
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•Plotters and Large-Format Printers
• Used for high-quality drawings such as
blueprints, maps, circuit diagrams, and signs
• Plotters
• Pen plotters
• Electrostatic plotters
• Large-format printer
• Photo-realistic quality color prints
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•Plotter
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Non-Impact printers
Special-purpose printers
• Photo printer
• Photo lab quality pictures
• Label printer
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