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... But now the main stream for the video display is flat-screen (also called "flat-panel") TV, it offer distinct advantages over the previous generation of traditional curved screen televisions: a more natural, realistic picture from corner to corner, minimal reflection of room lights to decrease glare and a wider angle of viewing that allows you to see the complete screen even if youre watching from the side. In the market, there are three main flat-screen formats
Ć conventional cathode ray tube (CRT) models, which are bulky and heavy but relatively inexpensive
Ć plasma models slender but pricey screens that mix xenon and neon gases which, when charged with electricity, fill with plasma gas to produce ultraviolet light rendered in 16 million colours
Ć liquid crystal display (LCD) models lightweight but larger versions of notebook PC monitors, which use a light source behind the display to illuminate every pixel consistently, producing a robust, sharp image
The cathode ray tube is an old technology, so in this technical report, we just focus on the technology of plasma TV and LCD TV.
The basic idea of a plasma display is to illuminate tiny colored fluorescent lights to form an image. ... Just like a CRT television, the plasma display varies the intensities of the different lights to produce a full range of colors. The central element in a fluorescent light is a plasma, a gas made up of free-flowing ions and electrons. ...
In a plasma with an electrical current running through
it, negatively charged particles are rushing toward
the positively charged area of the plasma, and
positively charged particles are rushing toward the
negatively charged area. ... These collisions excite the gas atoms in the plasma, causing them to release photons of energy. The xenon and neon gas in a plasma television is contained in hundreds of thousands of tiny cells positioned between two plates of glass. ...
To ionize the gas in a particular cell, the plasma displays computer charges the electrodes that intersect at that cell. ...
The phosphors in a plasma display give off colored light when they are excited. ...
LCD stands for Liquid Crystal Display. Incredibly, this technology has its roots in 1888 when Friedrich Reinitzer melted cholesteryl benzoate. ... This very important principal in LCD technology is called the twisted nematic field effect. ... The cross-section of the LCD panel looks like a multi-layer sandwich. ... Completing the LCD is a fluorescent backlight that illuminates the screen from beneath. ...
1) Contrast and color saturation
Plasma TVs offer better contrast and color saturation than LCDs by design. Plasma pixels remain dark with no voltage while LCD pixels try to keep light from coming through.
Approximate Word count = 2122
Approximate Pages = 8.5
(250 words per page double spaced)
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