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Plasma Display Panel - PDP) is a type of flat screen TV usually used for large (about 37 inches or 940 mm.). It consists of many tiny cells located between two panels of glass containing a mixture of noble gases (neon and xenon). The gas in the cells
General characteristics

Composition of a plasma screen
Plasma displays are bright (1000 lux or more per module), have a wide range of colors and can be manufactured in large enough sizes, up to 262 "diagonal. They have a very low luminance black level, creating a black man who is more desirable for watching movies. This screen is only about 6 cm thick and its total size (including electronics) is less than 10 cm. Plasmas use as much energy per square meter as a CRT or AMLCD TVs. The power consumption can vary greatly depending on what you are watching it. Bright scenes (like a football game) will require a higher energy than the dark scenes (like a night scene of a movie.) The nominal dimensions indicate 400 watts for a 50-inch screen. The relatively recent models consume 220 to 310 watts for TVs of 50 inches when using movie mode. Most screens are set to mode "store" by default and consume at least twice the energy of a more comfortable setting for the home.
The lifetime of the latest generation of plasma displays is estimated at about 100,000 hours (or 30 years to 8 hours of use per day) for real time viewing. In particular, this is the estimated average life span for the display, the time when the image has been degraded to half its original brightness. Can still be used but is considered the end of functional life of the device. Competitors include
LCD CRT, OLED, AMLCD, DLP, SED-tv, etc.. The main advantage of plasma technology is that large screens can be produced using extremely thin materials. Since each pixel is lit individually, the image is very bright and has a wide viewing angle.

functional details
and xenon gases neon in a plasma television are contained in hundreds of thousands of tiny cells between two glass screens. The electrodes are also "sandwich" between the two panes in the front and back of the cells. Some electrodes are placed behind the cells, along the rear glass panel and other electrodes, which are surrounded by an insulating dielectric material and covered by a protective layer of magnesium oxide, are located in front of the cell, to along the front glass panel. The circuit charges the electrodes that intersect at each cell creating voltage difference between the rear and the front and cause the gas to ionize and form plasma. Later, when gas ions rush to the electrodes and collide, photons are emitted.
In a monochrome display is possible to maintain the ionized state by applying a low voltage to all vertical and horizontal electrodes, even when the voltage ion has been removed. To erase a cell all voltage is removed from a pair of electrodes. This type of display has inherent memory and does not use phosphors. It adds a small amount of nitrogen to neon to increase hysteresis.
In color displays, the back of each cell is coated with a phosphor. Ultraviolet photons emitted by the plasma excite these phosphors emit light and color. The operation of each of the cells can be compared with a fluorescent lamp.
Each pixel is composed of three separate cells (subpixel), each with different colored phosphors. One subpixel has a match with red light, another phosphor subpixel has a green light and one subpixel has with blue light. These colors blend to create the final color of the pixel in the same way as in the "triads" of shadow masks for CRTs. By 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. Thus, the control system is capable of producing most of the visible colors. Plasma displays use the same matches that of CRTs, which explains the extremely accurate color reproduction.

Contrast Ratio

The contrast ratio is the difference between the brightest part of the image and the darkest, measured in discrete steps, at a given time . Generally, the higher the contrast ratio is more realistic image. The contrast ratios for plasma displays are often advertised in a 30.000:1 15.000:1. This is an important advantage del plasma sobre otras tecnologías de visualización. Aunque no hay ningún tipo de directriz en la industria acerca de cómo informar sobre el ratio de contraste, la mayoría de los fabricantes siguen o bien el estándar ANSI o bien realizan tests “full-on-full-off”. El estándar ANSI usa un patrón para el test de comprobación a través del cuál los negros más oscuros y los blancos más luminosos son medidos simultáneamente, logrando la clasificación más realista y exacta. Por el otro lado, un test “full-on-full-off” mide el ratio usando una pantalla de negro puro y otra de blanco puro, lo que consigue los valores más altos pero no representa un escenario de visualización typical. Manufacturers can artificially enhance the contrast ratio obtained by increasing the contrast and brightness to achieve the highest values \u200b\u200bin the test. However, a contrast ratio generated by this method would be misleading because the picture would be essentially impossible to see with this configuration. It is often said that plasma screens have better black levels (and contrast ratios), although both plasma screens and LCDs have their own technological challenges. Each cell on a plasma screen to be filled to illuminate (otherwise the cell would not respond fast enough) and the preload raises the possibility that the cells fail the true black. Some manufacturers have worked hard to reduce the preload and the associated background glow to the point where black levels on modern plasmas are beginning to rival the CRT. With LCD technology, black pixels are generated by a method of polarization of light and are unable to completely hide the underlying backlight.
A defect in the plasma technology is that if the screen is usually used to maximum brightness significantly reduces the lifetime of the device. For this reason, many consumers use a brightness setting below the maximum, but is still brighter than CRTs.

burnt screen effect
The phosphorus-based electronic displays (including cathode-ray televisions and plasma), prolonged exposure to a static image for too long can cause objects to be displayed there are marked on the screen for a while. This is due to the fact that phosphorus compounds that emit light lose their luminosity with use. As a result, when certain areas of the screen are used more frequently than others, over time the lower luminosity areas become visible to the naked eye, this is called screen burn. A symptom common is that the image quality gradually decreases according to the brightness variations that occur over time, resulting in an image that looks "muddy"
LCD screens on the other hand do not usually suffer the so-called "ghosting" typical CRT and plasma screens.

Comparison between Plasma and LCD becomes electrically in plasma which causes the phosphors to emit light.

Below is a small comparison between the two technologies:

Advantages compared to LCD PLASMA
Mayor contrast, the which translates into an increased ability to play the black and the full scale of grays. Mayor

viewing angle No response time, which avoids the "wake" or "ghosting" that occurs at certain times due to high LCD refresh (over 12ms).
does not contain mercury, unlike LCDs. Colors
smoother to the human eye.
more colors and more real.

Advantages of LCD PLASMA off the

The cost of manufacturing the plasma display is superior to LCD screens This does not affect the cost of manufacturing both the PVP and the profit margin from the shops, hence the large stores often do not usually work with them for the benefit of the lcds.
consumption: a TV with large plasma screen can consume up to 30% more electricity than LCD television. Effect
screen "burned" in plasma: if the screen stays on for a long time showing static images (like logos or news headlines) is possible that the image is fixed or overwritten on the screen. Although this effect is solved from the eighth generation. Currently we are on the eleventh generation and this effect no longer plays).