Various Disply Devices and Printers

8/3/2019 Various Disply Devices and Printers

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DISPLAY DEVICES

DISPLAY DEVICES ARE USED FOR VISUAL INFORMATION OF PRESENTATION

1. Analog display devices (cathode-ray tubes)

Oscilloscope tubes

TV CRTs

2. Digital display devices

LED (including OLED) displays

VF (vacuum fluorescent ) displays

LCD (liquid crystal) displays

Nixie tube displays and PDPs (plasma display panels)

Electroluminescent displays (ELDs)

3. Others:

Electronic paper

Using principles of nanoelectronics (carbon nanotubes, nanocrystals)

Laser TV


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Objectives: overview structures, principles of operation

and general properties of display devices

Cathode ray tubes

Electron gunOscilloscope tubes

Picture tubes

Flat panel displays

LED displays

Vacuum fluorescent displays

Gas discharge displays and plasma display panels

Liquid crystal displays

Other displays

Display devices. Content and objectives


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Oscilloscope tubes

The most important characteristics ofan oscilloscope tube are deflectionsensitivity(deflection on the screenper volt), bandwidth (or rise time ofthe step-function response), spotdiameter, useful scan and maximum

writing speed. The high sensitivity and super-wide-

band of CRTs are achieved usingtraveling-wave deflecting systems.Electrons of the beam in thetravelling-wave deflecting system aredeflected by the incident

electromagnetic wave propagatingalong the system with the samevelocity as electrons of the beam.

Waveforms of (a) signal voltage, (b) sweep

voltage, (c) blank pulses, and (d) signal form on

the screen of the CRT


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Flat panel display

CRTs are relatively fragile and bulky.

Other types of thinner displays were developed. They are oftencalledflat panel displays.

Most flat-panel displays form digits or characters withcombination of segments or dots. The arrangement of these

elements is called the display font.The most common format for numeric display is the seven-

segment font.

Graphic displays are like very large dot matrices. Each dot in a

graphic display is calledpicture element,pixelorpel. Thecapabilities of a graphic display depend on number of pixelshorizontally and vertically.
http://images.google.lt/imgres?imgurl=http://www.avagotech.com/pc/images/product/Product%20Image/90081.gif&imgrefurl=http://www.avagotech.com/productDetail?navId=H0,C1,C5231,C4941,C4963,C5037,C5173,P90081&h=200&w=175&sz=12&hl=lt&start=5&tbnid=AaCSW5bwN3cxfM:&tbnh=104&tbnw=91&prev=/images?q=Seven+segment+display&svnum=10&hl=lt&sa=Ghttp://images.google.lt/imgres?imgurl=http://www.avagotech.com/pc/images/product/Product%20Image/90081.gif&imgrefurl=http://www.avagotech.com/productDetail?navId=H0,C1,C5231,C4941,C4963,C5037,C5173,P90081&h=200&w=175&sz=12&hl=lt&start=5&tbnid=AaCSW5bwN3cxfM:&tbnh=104&tbnw=91&prev=/images?q=Seven+segment+display&svnum=10&hl=lt&sa=G


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LED DISPLAY

Light emitting diodes are used in LED displays.

Operation of the LED displays is based on the injectionluminescence.

LED displays are available in many different sizes and shapes.

Usually LED displays radiate red, orange, yellow or green light.

They have a wide operating temperature range, are inexpensive,easily interfaced to digital logic, easily multiplexed, do not requirehigh voltages and have fast response time.

The viewing angle is good and display of arbitrary numbers of digitsis easily assembled.


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The amazing new VAIO TX3 is the smallest and

lightest fully featured notebook around.

Developed for ultimate mobility using

advanced carbon-fibre materials, TX3 includes

a range of brilliant design innovations including

a super-thin LED display panel and postcard-

sized motherboard.

LED displays


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High LED Technology Displays & Giant Screens

High LED Technology

for the Visual Communication in the XXI Century

Select Your Giant

Screen and

Ask Now For an Online

Quotation.It Takes 30 Seconds!

280,000,000,000 Colours

3 LEDs: Red+Green+Blue

Colour White: Yes

Indoor-Outdoor (IP65)Plug&Play Technology

High Brightness


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The World Largest 3D LED Display
http://ledlightray.com/archives/the-world-largest-3d-led-display.htmlhttp://ledlightray.com/archives/the-world-largest-3d-led-display.html


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Filament consists of tungsten coated with the oxidizedBa, Sr and Ca. Powered filament generates heat and

emits thermal electrons which are dispersed and

selected by the grid electrode and reach the anode

electrode. On the anode electrode, display pattern is

formed with phosphor which emit light

Vacuum fluorescent displays


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Gas discharge displays and plasma display panels

The most common form of nixie tube has ten cathodes in the shapes of the

numerals 0 to 9 (and occasionally a decimal point or two), but there are also

types that show various letters, signs and symbols. Each cathode can bemade to glow in the characteristic neon red-orange color by applying about

170 voltsDC at a few milliamps between a cathode and the anode.
http://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Direct_currenthttp://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/wiki/Direct_currenthttp://en.wikipedia.org/wiki/Volt


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Electroluminescent displays

ELDs are particularly useful in applications where full color is not required but

where ruggedness, speed, brightness, high contrast, and a wide angle of

vision is needed.


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Carbon nanotube

displays
http://upload.wikimedia.org/wikipedia/commons/5/53/Types_of_Carbon_Nanotubes.png


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The promise ofMotorola's new Nano Emissive Display (NED) technology is

sweet for anyone that covets a flat screen HDTV, but doesn't want to pony

up big bucks.

Imagine a 40 inch HDTV panel less than an inch thick.

Now imagine it costing less than $400.Motorola Labs unveiled a prototype of NED technology in the form of a

functioning 5-inch color segment of a 1280 x 720, 16:9, 42-inch HDTV

A prototype model was demonstrated by Motorola in May 2005.

Nano-emissive display (NED) is Motorola's term for their Carbon

Nanotubes (CNTs)-based display technology.

Carbon nanotube displays
http://www.motorola.com/http://www.motorola.com/content/0,,258-841,00.htmlhttp://en.wikipedia.org/wiki/Motorolahttp://en.wikipedia.org/wiki/Motorolahttp://www.motorola.com/content/0,,258-841,00.htmlhttp://www.motorola.com/


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Electronic paper, also sometimes called e-paper or electronic ink, is a

display technology designed to mimic the appearance of regular inkon paper. Unlike a conventional flat panel display, which uses a

backlight to illuminate its pixels, electronic paper reflects light like

ordinary paper and is capable of holding text and images indefinitely

without drawing electricity, while allowing the image to be changed

later.

E-paper
http://en.wikipedia.org/wiki/Display_devicehttp://en.wikipedia.org/wiki/Inkhttp://en.wikipedia.org/wiki/Paperhttp://en.wikipedia.org/wiki/Flat_panel_displayhttp://en.wikipedia.org/wiki/Backlighthttp://en.wikipedia.org/wiki/Pixelhttp://en.wikipedia.org/wiki/Pixelhttp://en.wikipedia.org/wiki/Backlighthttp://en.wikipedia.org/wiki/Flat_panel_displayhttp://en.wikipedia.org/wiki/Paperhttp://en.wikipedia.org/wiki/Inkhttp://en.wikipedia.org/wiki/Display_device


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E-paper
http://en.wikipedia.org/wiki/Image:E-Ink_Flex_Tablet_Display.jpg


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WHAT IS PRINTER

An external hardware device responsible fortaking computer data and generating a hard

copy of that data. Printers are one of the

most commonly used peripherals and theyprint text and still images on the paper.


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Printers

Impact Printers Non-Impact Printers

Daisy

wheel

Dot-

MatrixInkjet Thermal Laser


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These printers have a mechanism that

touches the paper to create an image.

These printers work by banging a print

head containing a number of metal

pins which strike an inked ribbon

placed between the print head and

the paper.

ImpactPrinter


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These printers create an image on

the print medium without the use offorce. They dont touch the paper

while creating an image. Non-impactprinters are much quieter than

impact printers as they dont strike

the paper.

Non-Impact

Printers


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The term dot matrix refers to the process ofplacing dots to form an image.

Its speed is usually 30 to 550 characters persecond (cps).This is the cheapest and the most noisyprinter and has a low print quality. Dot Matrixwere 1st introduced by Centronics in 1970.

Dot Matrix Printer


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The dot matrix forms images one character at a time

as the print head moves across the paper.

Uses tiny pins to hit an ink ribbon and the paper

much as a typewriter does.This printer arranges dots to form characters and all

kinds of images.

9 to 24 vertical column pins are contained in a

rectangular print head. When print head movesacross the paper, pins are activated to form a dotted

character image. These printers can produce carbon

copies along with the originals

How Dot-Matrix

works?


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Advantages:

(1) In-expensive.(2) Low per page cost.(3) Energy efficient.Dis-advantages:(1) Noisy

(2) Low resolution(3) Limited fonts flexibility(4) Poor quality graphics output.

Advantages/Dis-advatages of Dot-Matrix printer


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Daisy Wheel Printer

A daisy wheel printer isbasically an impact printer

consisting of a wheel andattached extensions on whichmolded metal characters aremounted. A daisy wheelprinter produces letter quality

print and it cant producegraphics output.


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How Daisy wheel printer

works

In a daisy wheel printer, a hammer presses the wheel

against a ribbon which in turn makes an ink stain onthe paper in the form of a character mounted on the

wheel extensions.

These printers are very noisy as there occur great

movement during the printing. Its printing speed is

also very slow ,i.e. less than 90cps.


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It is a non-impact printer producinga high quality print. A standardInkjet printer has a resolution of300dpi. Newer models havefurther improved dpi. Inkjetprinters were introduced in thelater half of 1980s and are verypopular owing to their extra-ordinary performance.

Ink-Jet Printer


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Inside an Inkjet Printer?

1) Print head Assembly:

Contains a series of nozzles

(2) Ink Cartridge:

Depending on the model & manufacturing ofprinters, ink cartridge come in various

combinations.

(3) Print head stepper motor:

A stepper motor moves the print head

assembly back and forth across the paper.

(4) Stabilizer bar:

The movement of print head is controlled and

made precise by a stabilizer bar.

(5) Belt:

A belt is used to attach print head assembly to

the stepper motor


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Advantages:

(1) High resolution output.

(2) Energy efficient.

(3) Many options to select.Dis-advantages:

(1) Expensive.

(2) Special paper required for higher resolution output.

(3) Time consuming in case of graphics printing.


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Thermal printers are in-expensive printersmostly used in fax machines. The Thermalprinters are further classified into two types.

(1) Electro thermal printers:(2) Thermal Wax printers:

Thermal Printer

Thermal printers use heated pins and ribbonswith different color bands. These printers

contain a stick of wax like ink. The ribbon

passes in front of a print head that has a series

of tiny heated pins. The pins cause the wax to

melt and adhere to the paper and when

temperature reaches to a certain level, it is

hardened


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Laser Printer

Laser printers use very advanced technology

and produce a high quality output. Laser

printers can also produce high quality graphics

images.

Resolution is 600 to 1200dpi.

(1) Paper is fed and the drum rotates.(2) A laser beam conveys information from thecomputer to a rotating mirror and thus animage is created on the drum.(3)The charges on the drum are ionized andthe toner sticks to the drum.(4)Toner is transferred from drum to paper.(5)Heat is applied to fuse the toner on thepaper.


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A multi function printer abbreviated asMFP is an all purpose device that prints,faxes, copies and scans. A single multifunction printer can replace several bulkydevices. A multi function printer is also

known as AIO. These printers use inkjettechnology and provide high quality printbut at slow speed.

Multi-function printer


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A large scale printer which is very accurate inproducing engineering drawings andarchitectural blueprints.Two types of plotters are flatbed and drum.Flatbed plotters are horizontally aligned whiledrum plotters are vertically positioned.

Plotter


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For home users, the quality of the print and

the price of the printer both matter. So a

better choice in such case is a portable color

Inkjet printer.

If the budget of the user is good enough then

the best choice is a personal laser printerwhich enhances both the speed and quality of

the print.

Printer for Home

users

In banks, large size business environmentsand companies printers with networkingcapabilities should be preferred which canincrease productivity and reduce the costwithout compromising on the quality. Ofcourse laser printer is quite suitable choicebut multi-functional printer and inkjet printercan also play vital role.

Printers for banks, large business

organizations and companies

APPLICATION


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In fact computer world isincomplete without printers in the

modern age of technology. A

printer is one of the basic needs of

every computer user and one can

not utilize computer resources

properly in the absence of aquality printer.

Conclusion


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THANK YOU

Various Disply Devices and Printers

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