display devices and printers

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Information about display devices and printers

Published on September 20, 2010

Author: rajtaher

Source: authorstream.com

VARIOUS DISPLAY DEVICESandPRINTERS : VARIOUS DISPLAY DEVICESandPRINTERS Presented by:- TAHER(08EC075) UMANG(08EC073) DISPLAY DEVICES : DISPLAY DEVICES DEFINATION:- A display device is a device for visual or tactile presentation of images (including text) acquired, stored, or transmitted in various forms. Ex : Computer monitor, TV screen. Also known as an information display MONITOR TECHNOLOGIES : MONITOR TECHNOLOGIES CATHODE RAY TUBE (CRT) LIQUID CRYSTAL DISPLAY (LCD) PLASMA DISPLAY PANEL (PDP) ORGANIC LIGHT EMITTING DIODE (OLED) RELATED TERMINOLOGIES : RELATED TERMINOLOGIES Pixel Resolution Display Size Viewing Angle Response time Brightness PIXEL : PIXEL Picture Element It is the smallest element forming an image. RESOLUTION : RESOLUTION No. of pixels per unit video display Video Graphics Array (VGA): 720 pixels across by 400 pixels down in text mode 640 pixels across by 480 pixels down in graphics mode. DISPLAY SIZE : DISPLAY SIZE Measured as distance from one corner to the diagonally opposite corner. Usually measured in INCHES. VIEWING ANGLE : VIEWING ANGLE It is angle from which the screen can be seen from side. It is larger for CRT as compared to LCD RESPONSE TIME : RESPONSE TIME The minimum time necessary to change a pixel's color or brightness. BRIGHTNESS : BRIGHTNESS The amount of light emitted from the display (more specifically known as luminance). CRT MONITOR cathode-ray tube : CRT MONITOR cathode-ray tube CRT : PRINCIPLE : CRT : PRINCIPLE CRT display works on : Electron emission Electrons are emitted from the Cathode tube. Phosphorescence It is the emission of visible light, when electron beam strikes Phosphor material. CRT : WORKING : CRT : WORKING Cathode Grid Focusing anode Accelerating anode Aquatic coating CRT DISPLAY:ADVANTAGES : CRT DISPLAY:ADVANTAGES Offers greater resolution . Widest viewing angle It is cheap as compared to LCD,PLASMA displays CRT DISPLAY:DISADVANTAGES : CRT DISPLAY:DISADVANTAGES Thickness is much larger Cannot be used for smaller displays, like watches. View area is less than the offered monitor size. It is more heavier. LCDLiquid Crystal Display : LCDLiquid Crystal Display LCD : DEFINITION : LCD : DEFINITION A Liquid Crystal Display is a thin, flat display device made up of any number of pixels arrayed in front of a light source or reflector. It uses very small amounts of electric power, and is suitable for use in battery-powered electronic devices LCD: WORKING : LCD: WORKING When electric current was passed through the LCD panel, the liquid crystals are aligned with the first polarized glass encountered and will make a 90o twist when approaching the other polarized glass at the end. LCD: WORKING : LCD: WORKING When this happens, the light from the fluorescent backlight is able to pass through and thus giving us a lighted pixel on the monitor. The reason we see the coloured images are due to the colour filter, light passes through the filtered cells creates the colors. When there is no electric current, the liquid crystals will not twist and thus the light will not pass through and a black pixel will be shown. LCD: ADVANTAGES : LCD: ADVANTAGES The sharpness of a LCD display is at maximum tweakness. Zero geometric distortion at the native resolution of the panel. High peak intensity produces very bright images. Best for brightly lit environments. Screens are perfectly flat. Thin, with a small footprint. Consume little electricity and produce little heat The LCD display unit is very light and can be put anywhere or moved anywhere in the house. Lack of flicker and low glare reduce eyestrain. LCD: DISADVANTAGES : LCD: DISADVANTAGES After a while the LCD display the some of the pixels will die you will see a discoloured spot on a black spot on the display. The cost of a LCD is considerably at a high price. The LCD display will have slow response times. The LCD display has a fixed resolution display and cannot be changed. LCDs use analog interface making careful adjustment of pixel tracking/phase in order to reduce or eliminate digital noise in the image. The viewing angle of a LCD display is very limited due to the Automatic pixel tracking/phase controls. PLASMA TECHNOLOGY : PLASMA TECHNOLOGY PLAZMA:DEFINATION : PLAZMA:DEFINATION A plasma display panel (PDP) is essentially a collection of very small fluorescent-type lamps, each a few tenths of a millimeter in size. The plasma display itself is a simple device consisting of two parallel glass plates separated by a precise spacing of some tenths of a millimeter and sealed around the edges. PLASMA DISPLAY : WORKING : PLASMA DISPLAY : WORKING Address electrode causes gas to change to plasma state. The plasma emits UV in discharge region which impinges on the phosphor Reaction causes each sub pixel to produce red, green, and blue light. PLASMA DISPLAY : ADVANTAGES : PLASMA DISPLAY : ADVANTAGES Supports large displays ,up to 103 inches diagonally. Overall thickness of monitor is less than 10 cm. and can be installed on a wall. Faster response time, Greater color spectrum, Wider viewing angle The plasma display units has a clearer image, better colour quality and higher contrast ratio than the CRT and LCD display units. PLASMA DISPLAY : DISADVANTAGES : PLASMA DISPLAY : DISADVANTAGES the plasma display unit has a very short life span, to be around 20,000 hours to 30,000 hours As your plasma display unit gets older its brightness gets dimmer. Plasma display units are considerably more expensive than CRT monitors. Plasma display units must be handled carefully because they are a very fragile display unit. Use more electricity, on average, than an LCD TV Generally do not come in smaller sizes than 37 inches Heavier than LCD due to the requirement of a glass screen to hold the gases ORGANIC LIGHT EMITTING DIODES(OLEDs) : ORGANIC LIGHT EMITTING DIODES(OLEDs) OLEDs: PRINCIPLE : OLEDs: PRINCIPLE OLEDs are special because they are made up of organic polymer molecules (otherwise known as plastic) allowing light to emit when a voltage is applied. OLEDs: WORKING : OLEDs: WORKING Voltage is applied across the OLED device allowing electrons to travel from the cathode through the emissive layer to make positively charged electron holes in the conductive layer where the anode draws those electrons. Quite simply, the anode is drawing electrons through the emissive layer to provide positive electron holes in the conductive layer. Then the Positive holes and the Electrons collide and recombine which leads to a drop in the electron energy level as visible light radiation is emitted. OLEDs: ADVANTAGES : OLEDs: ADVANTAGES Transparent Flexible Light-emitting, and quite bright (daylight visible) Large viewing angle Fast (< 1 microsecond off-on-off) Can be made large or small A black screen with OLED screen technology requires zero power input. The result of this is a rich 'dark' black giving a very large contrast ratio of 1,000,000:1 between lightest and darkest areas. Viewing an OLED display is far easier on the eye and the colors are much more vivid and natural to look at. PRINTERS : PRINTERS PRINTERS: DEFINATION : PRINTERS: DEFINATION In computing, a printer is a peripheral which produces a hard copy (permanent readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper or transparencies. PRINTERS: TYPES : PRINTERS: TYPES Dot-matrix Printers Inkjet printer Laser printer DOT-MATRIX PRINTERS : DOT-MATRIX PRINTERS DOT-MATRIX PRINTERS: WORKING : DOT-MATRIX PRINTERS: WORKING The printer head is made up of a row of pins - usually 9 or 25 pins forming a vertical bar. To form a letter, the pins are "fired" in quick succession to press the ribbon against the paper. DOT-MATRIX PRINTERS: ADVANTAGES : DOT-MATRIX PRINTERS: ADVANTAGES Relatively cheap to buy Low operating costs Can print on continuous stationary Create carbon copies using carbonated paper Robust and will work perfectly well in harsh or dirty conditions such as garages or factories. DOT-MATRIX PRINTERS: DISADVANTAGES : DOT-MATRIX PRINTERS: DISADVANTAGES Print quality is poor and important documents are not suitable to give to managers or customers Very slow - slowest out of all three printers Noisy - you wouldn't want one of these printing all day in the office Cannot produce color copies INKJET PRINTERS : INKJET PRINTERS INKJET PRINTERS: WORKING : INKJET PRINTERS: WORKING The Inkjet Printer is a common type of printer which works by spraying a tiny drop of ink at paper. The technology is probably best explained by this animated picture. The printing works the same way as the dot matrix print head above. The only difference is that we are now using droplets of ink instead of hammers. INKJET PRINTERS: WORKING : INKJET PRINTERS: WORKING Inkjets work by having a print cartridge with a series of tiny electrically-heated chambers constructed by photolithography. To produce an image, the printer runs a pulse of current through the heating elements. A steam explosion in the chamber forms a bubble, which propels a droplet of ink onto the paper. When the bubble condenses, surplus ink is sucked back up from the printing surface. The ink's surface tension pumps another charge of ink into the chamber through a narrow channel attached to an ink reservoir LESER PRINTERS : LESER PRINTERS LASER PRINTER: WORKING : LASER PRINTER: WORKING Images are produced on a drum A laser beam sets electrical charge on dots on the drum Magnetically charged powder called toner flies to the electrified dots on the drum The drum rolls the toner on the paper A second drum burns the toner on the paper LASER PRINTER: WORKING : LASER PRINTER: WORKING The final stage is for the paper to pass through very hot "rollers" which "melt" the ink on to the paper Now lets look at how the laser writes on the drum. Laser print demonstration The heat "seals" the ink onto the paper instantly making sure that you do not get smudging or crinkling as you can with other printer types. OTHER TYPES OF PRINTERS : OTHER TYPES OF PRINTERS Solid ink– use sticks of wax that are melted to create the ink for printing. environmentally friendly, no ozone production. Ink sticks last approx. 3000 pages compared to average 1500 for laser printers. Dye sublimation:-High quality printer. Solid dye contained on either a ribbon or a roll. The roll is consecutive pages of cyan, magenta, yellow and sometimes black. The dye diffusion thermal process is known as D2T. Thermal Printers Thermal wax transfer Direct thermal Thermal autochrome THANK YOU : THANK YOU

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