Jay Shah Ppt.pptx

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INTRODUCTION • For the past 75 years, the vast majority of televisions have been build around the same technology: the cathode ray tube. • Working : A gun fires a beam of electrons inside a large glass tube. The electrons excide 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.

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DRAWBACKS OF CRT • They are bulky. • To increase the screen width in a CRT set, also have to increase the length of the tube. • Produce crisp and vibrant images. • Problem of loosing originality of color and proportion. • A new alternative solution : Plasma flat panel display • Plasma display panel is a type of flat panel display commonly used for large TV displays (typically above 37 inch or 940mm).

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HISTORY AND ADVANTAGE OF PDP • The plasma display panel was invented by Donald L. Bitzer and H. Gene Slotton in 1964 for the PLATO computer system at the university of linois at Urbana-champaign. • In 1992, fujitsu introduced the world’s first 21 inch full color display. it was a hybrid , based upon the plasma display achieving superior bightness. • Advantage : provide high information content and full colour images.

produce a very wide screen using extremely thin materials. the high contract ratios offered make the blacks blacker and the whites whiter. plasmas are also free from magnetic interference. 4

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.

• 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.

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PLASMA TV

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FUCTIONAL 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 insulting dielectric material and covered by a magnesium oxide protective layer, are mounted in front of the cell, along the front glass plate. • Ultraviolet photons emitted bythe plasma excite these phosphors to give off colored light.

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SCHEMATIC OF PDP

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ADVANTAGE AND DISADVANTAGE OF PLASMA TV ADVANTAGE • Exceptional color: plasma TVs display up to 16.77 million colors. • High resolusion: plasma TVs are able to display a high resolution, and are capable of displaying HDTV signals. • Aspect ratio 16:9 and flat screen.

• Slim , lightweight Design. • Uniform screen brightness.

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ADVANTAGE AND DISADVANTAGE OF PLASMA TV DISADVANTAGE • 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 out tube or backlight. • Units are quite easy to damage • Price • Not the lightest or slimmest. • Lower brightness. 10

SIZE OF PLASMA TV • The majority of plasma TV’s and big screen televisions are manufactured in the widescreen 16:9 aspect ratio. • 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,42 inches,50 inches and around 60 inches. • The most popular plasma television screen sizes are 32 inches and 60 inches.

• The larger plasma television screen, the heavier it will be and the harder it will be to mount .

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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.

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