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Plasma Tv(2)


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  • 1. PLASMA TV
  • 2. INTRODUCTION  For the past 75 years, the vast majority of televisions have been built around the same technology: the cathode ray tube (CRT).  Working: a gun fires a beam of electrons inside a large glass tube. The electrons excite phosphor atoms along the wide end of the tube (the screen), which causes the phosphor atoms to light up.  The television image is produced by lighting up different areas of the phosphor coating with different colors at different intensities.
  • 3.  Drawbacks Of CRT:  Produce crisp and vibrant images.  They are bulky.  To increase the screen width in a CRT set, also have to increase the length of the tube.  Problem of loosing originality of color and proportion.  A new alternative has popped up: the Plasma Flat Panel Display.  A plasma display panel (PDP) is a type of flat panel display commonly used for large TV displays (typically above 37-inch or 940 mm).  A plasma display panel (PDP) is a display device. Use phenomena that visible ray is generated from a fluorescent substance when vacuum ultraviolet ray generated by gas discharge excites the fluorescent substance.
  • 4.  Plasma display devices can be divided into an AC type and a DC type in terms of the driving method.  A DC PDP is designed to operate in a direct current discharge state in which electrodes are exposed to a discharge space (discharge gas).  An AC PDP is designed to operate in an alternating current discharge state in which electrodes are covered with dielectric layers and are not directly exposed to a discharge gas.  Advantages Of AC PDP : a) offer a higher resolution display. b) implementing larger display sizes. c) ease of manufacture
  • 5. HISTORY  The Plasma display panel was invented by Donald L. Bitzer and H. Gene Slottow in 1964 for the PLATO Computer System at the University of Illinois at Urbana-Champaign.  In the late 1980s as semiconductor memory made CRT displays cheaper than plasma displays.  Plasma's relatively large screen size and thin profile made the displays attractive for high-profile placement such as lobbies and stock exchanges.  In 1992, Fujitsu introduced the world's first 21-inch (533 mm) full-color display. It was a hybrid, based upon the plasma display achieving superior brightness.  In 1996, Matsushita Electrical Industries (Panasonic) purchased Plasmaco, its color AC technology, and its American factory.  Pioneer, 1997, started to sale the first Plasma TV to the public.  The largest Plasma display, measured 103" and was made by Matsushita Electrical Industries (Panasonic), in the world was shown at the CES (Consumer Electronics Show) in Las Vegas in 2006.
  • 6. ADVANTAGE OF PDP  Provide high information content and full colour images.  Produce a very wide screen using extremely thin materials.  The image is very bright and looks good from almost every angle.  The high contrast ratios offered make the blacks blacker and the whites whiter.  The image is inherently sharper, brighter and perfect from edge to edge.  Plasmas are also free from magnetic interference.
  • 7. INTRODUCTION TO PLASMA TV  Plasma TV a kind of plasma display devices employing the plasma display panel (PDP).  Plasma TV's create a picture from a gas (plasma) filled with xenon and neon atoms and millions of electrically charged atoms and electrons, that collide when the power turn on.
  • 8.  Energy from the collision releases, increases the energy level in the plasma and the neon and xenon release photons of light.  They offer excellent picture quality, they are quite expensive and are fast becoming the popular choice for HDTV.  The plasma screen is thinner and lighter than a cathode ray tube CRT, which has been used as main display means so far, and can be embodied of high definition and wide screen.  Plasma TVs offer large viewing areas (up to 50 inches) but are very thin. While they offer excellent picture quality, they are quite expensive and are fast becoming the popular choice for HDTV.  The advantages of a plasma TV is no matter how big is the image, the size, thickness is only 1/6 of the CRT.
  • 10. Composition Of Plasma Display
  • 11. FUNCTIONAL DETAIL  The xenon and neon gas in a plasma television is contained in hundreds of thousands of tiny cells positioned between two plates of glass.  Long electrodes are also sandwiched between the glass plates, in front of and behind the cells.  The address electrodes sit behind the cells, along the rear glass plate.  The transparent display electrodes, which are surrounded by an insulating dielectric material and covered by a magnesium oxide protective layer, are mounted in front of the cell, along the front glass plate.
  • 12.  Control circuitry charges the electrodes that cross paths at a cell, creating a voltage difference between front and back and causing the gas to ionize and form a plasma; as the gas ions rush to the electrodes and collide, photons are emitted.  In a monochrome plasma panel, the ionizing state can be maintained by applying a low-level voltage between all the horizontal and vertical electrodes  Small amount of nitrogen is added to the neon to increase hysteresis.  In color panels, the back of each cell is coated with a phosphor.  Ultraviolet photons emitted by the plasma excite these phosphors to give off colored light.
  • 13.  Every pixel is made up of three separate subpixel cells, each with different colored phosphors.  Colors blend together to create the overall color of the pixel.  Varying the pulses of current flowing through the different cells thousands of times per second, the control system can increase or decrease the intensity of each subpixel color to create billions of different combinations of red, green and blue.  Control system can produce most of the visible colors.
  • 14. CONTRAST RATIO CLAIMS  Contrast ratio is the difference between the brightest and darkest parts of an image, measured in discrete steps, at any given moment.  The higher the contrast ratio, the more realistic the image is.  Contrast ratios for plasma displays are often advertised as high as 20,000:1.  This is a significant advantage of plasma over other display technologies.  Manufacturers follow either the ANSI standard or perform a full-on-full- off test.
  • 15.  The ANSI standard uses a checkered test pattern whereby the darkest blacks and the lightest whites are simultaneously measured, yielding the most accurate "real-world" ratings.  A full-on-full-off test measures the ratio using a pure black screen and a pure white screen.  Manufacturers can further artificially improve the reported contrast ratio by increasing the contrast and brightness settings to achieve the highest test values.  Plasma is often cited as having better black levels (and contrast ratios).  Each cell on a plasma display has to be precharged before it is due to be illuminated (otherwise the cell would not respond quickly enough) and this precharging means the cells cannot achieve a true black.  Running a display at maximum brightness will significantly reduce the panel's lifespan .
  • 16. ADVANTAGE OF PLASMA TV  Plasma TVs offer many advantages over other television technologies:  Exceptional Color: Plasma TVs display up to 16.77 million colors.  High Resolution: Plasma TVs are able to display a high resolution, and are capable of displaying HDTV signals.  Widescreen Aspect Ratio: Plasma TVs offer a dramatic widescreen 16:9 ratio display.  Flat Screens: Plasma TVs offer perfectly flat screens, cutting down on image distortion and glare.  Magnetic Field Immunity.  Slim, Lightweight Design.  Uniform Screen Brightness.  Computer compatibility.
  • 17. DISADVANTAGE OF PLASMA TV  Of course, not all technologies are perfect, and Plasma TVs do have some disadvantages compared to other TV technologies:  Shorter Life: Compared to other television technologies, Plasma TVs do generally have a shorter life span, and there is no option to repair a burnt out tube or backlight.  Fragility: Plasma TVs are a very fragile technology, and the units are quite easy to damage.  Price.  Not the Lightest or Slimmest.  Lower Brightness.  Potential Burn-In.
  • 18. SIZE OF PLASMA TV  The majority of plasma TV's and big screen televisions are manufactured in the widescreen 16:9 aspect ratio.  Plasma televisions come in a number of different sizes and like all televisions, plasma monitors are measured diagonally across the screen.  Plasma television screens start as small as 5 inches and increase in size up to 63 inches or larger.  The typical sizes are 24 inches, 32 inches, 40 inches, 50 inches and around 60 inches. The most popular plasma television screen sizes are 32 inches and 61 inches.
  • 19.  The larger plasma television screen, the heavier it will be and the harder it will be to mount.  Sitting within close proximity of the screen, , say six to ten feet away, then best choice would be a medium sized monitor of 32 or 36 inches.  The best picture quality will come from a 42 inch plasma screen television ; at least ten feet away from the screen.  For the really big picture and to fully appreciate the quality of a Plasma screen, need to be at least fifteen feet back.
  • 20. Worlds Largest Plasma Television  Panasonic, one of the most reputable and top manufacturers of television sets, announced they will sell the worlds largest plasma television set available on the market today.  At one hundred and three inches, this flat screen option is currently the largest plasma television available. It has a SRP of $69,999.95.
  • 21.  The largest plasma television screen comes with high definition technology capability which will allow for an even more life like experience when viewing television.  When watching movies or sporting events, can feel like we are right there in the action. This is an exciting way to watch television and will greatly enhance the experience.  There are other manufacturers that produced large screen plasma television sets. Both LG and Samsung produced a one hundred and two inch screen but with Panasonic's one hundred and three, they were out classed and Panasonic takes the prize for the largest plasma television screen to date.
  • 22. Where To Buy Plasma TVs  Generally, the cheapest prices on Plasma TVs can be found through online retailers.  Few things should be kept in mind:  Shipping and other hidden costs: Be careful of great TV prices that have extraordinarily high shipping and handling costs, or other hidden costs like charging a few hundred dollars for a stand that is included standard with the TV.  Unauthorized dealers: Most Plasma TV manufacturers have authorized dealers that they sell through. Some online retailers are not authorized - they may have better prices in some cases.  Great prices on auctions sites: Be very careful if you are planning to purchase a TV through an auction site.  Prices to good to be true.
  • 23. GREAT COMPETITOR  The great competitor of the Plasma TV is LCD TV.  Plasma TV versus LCD TV: Both Plasma and LCD TV technologies are advancing rapidly, and prices have fallen dramatically since both were introduced. Both definitely represent two of the best new television technologies and generally offer excellent picture quality.  Following Plasma vs. LCD overview:  Screen size.  Cost.  Picture Quality.
  • 24. ANY QUERIES ?