Tip 1: How Plasma TV Works

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Tip 1: How Plasma TV Works

Plasma displays first appeared in the 1960s. They have a lot of advantages - a large viewing angle, small thickness, high screen brightness and a flat viewing area.

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Instructions

To imagine how the plasma worksTV, just look at the fluorescent lamp, which works on the same principle. The lamp contains argon or any other inert gas, normally the atoms of such gas are electrically neutral, but if an electric current is passed through it, a huge amount of free electrons attack the atoms of the gas, which will lead to the loss of a neutral charge. As a result, the gas is ionized and converted into a conducting plasma.

In this plasma, the charged particles are inconstant movement in search of free places, colliding with the atoms of gas, which causes them to emit ultraviolet photons. These photons are invisible if they are not directed to the phosphor coating that is used inside fluorescent tubes. The phosphor particles after the entry of ultraviolet photons begin to emit their own visible photons, which are visible to the human eye.

Plasma panels use the same principle,only there is used a flat multilayer structure of glass, and not a tube. Between the walls of glass are hundreds of thousands of phosphor-coated cells. This phosphor can glow with green, red and blue light. Under the outer glass surface are located transparent display electrodes of elongated shape, on top they are covered with a dielectric sheet, and from below with magnesium oxide.

Under the electrodes are located cells of phosphorsor pixels, they are performed in the form of very small boxes. Below them is a system of address electrodes located perpendicular to the display, each address electrode passes through the pixels.

Between the cells before sealing the plasmaa special mixture of neon and xenon is injected under low pressure, they are inert gases. To ionize a particular cell, you need to create a voltage difference between the address and display electrodes that are located above and below this particular cell.

Because of this voltage difference, the gas is ionized,emitting a huge amount of ultraviolet photons that bombard the surface of pixel cells, exciting a phosphor, because of what it emits light. Voltage fluctuations (which are created by code modulation) allow you to change the color intensity of each particular pixel. This process occurs simultaneously with hundreds of thousands of such pixel cells, which allows you to get a high-quality image.

Tip 2: How to Test a Plasma TV

When buying a plasma TV, you need to check it properly. In addition to visual analysis of the state of the TV, there are more detailed methods for evaluating its quality.

You will need

- TFT Test;
- HDMI-HDMI cable.

Instructions

Naturally, first of all, evaluate the appearance of the selected TV. Make sure there are no scratches, dents and other defects. Turn on the TV and visually evaluate the image quality.

Now use the TFT Test program. It works with Windows operating systems, so connect the plasma TV to a computer or laptop. It is better to use for this purpose digital channels, for example DVI or HDMI.

After making this connection, open thethe TV settings menu and select the used port as the source of the signal. Open the screen settings on the laptop and select the graphic image of the TV. Activate the "Make this screen basic" option. Run the TFT Test program.

Select the screen resolution you are usingTV, color depth and refresh rate, for example 1366x768, 32 bit and 60 Hz. Click on the icon "Painted screen". Carefully study the TV's display for broken pixels. Press the "Right" arrow on the keyboard to change the screen. Some pixels may not work correctly with a particular color. Repeat this process by examining the display with all available colors. Press Esc to exit this menu.

Now open the "Grid" menu and make sure,that the screen is divided into flat squares. Click the left mouse button to change the background of the grid. Perform the same procedure after opening the "Circles" menu.

Click on the "Moving square" icon. Examine the data displayed in the upper left corner. Make sure that the display supports a constant refresh rate. Find out the delay in outputting the image.

Do the same analysis of the TV status by opening the "Moving Lines" menu. Run a high resolution movie and good quality and appreciate the image produced by the TV screen.

Tip 3: Why is the plasma cheaper lcd

Choosing a new TV, the buyer isbefore the question, which is better: LCD or "plasma"? If LCD TVs are more expensive, does that mean they outperform relatively inexpensive plasma panels?

How do LCD TVs differ from plasma ones: theory

Traditional TVs with pot-bellied picture tubes,in fact, have already become a part of history. Now in the market of TVs the ball is corrected by liquid crystal displays and plasma panels. At the same time, the cost of "plasma" is slightly lower than that of an LCD TV. But does it always mean better? The answer to this question is related to the technology of producing televisions. The principle of the plasma panel operation is as follows. A narrow space between two transparent panels is filled with a special gas. In the same place there is a grid of wires through which an electric current passes. When the TV works, electricity turns the gas into a plasma, which causes fluorescent elements to glow. So it turns out the image. LCD-TVs are arranged quite differently. The picture on the screen is due to liquid crystals that modulate the light emanating from the rear lamp. Liquid crystals, depending on the electrical voltage, pass through this or that part of the light spectrum.

How are things going in practice?

How these technological features manifest themselvesin practice, and what are the advantages of having more expensive LCD TVs compared to "plasmas" that are cheaper? First, until recently the production of LCD TVs with a diagonal of more than 32 inches was impossible. Now the manufacturers have learned to make large LCD-displays, but it is technologically difficult and expensive. With the "plasmas" the situation is the opposite: the technology does not allow to create a plasma panel with a small diagonal. But the production of a plasma TV with a diagonal of more than 32 inches is much less expensive than an LCD TV of the same size. At the moment, the cost of LCD panels is 25% higher on average, which is the main reason for the higher price of such TVs with respect to plasma panels . In practice, however, "plasmas" win in many respects, although there are advantages to LCD TVs, otherwise there would be no sense in producing them. One of the most important advantages of LCD TVs is low energy consumption: "plasma" requires twice as much electricity for operation . In addition, plasma TVs are very hot during operation, so they have to be equipped with special ventilation systems, which create additional noise. In addition, because of the danger of overheating, the plasma TV is unsafe to place in niches. Another important advantage of the LCD is the service life: they have an average of 80,000 hours, which is twice as much as that of the "plasma." As for the image quality, the LCD is inferior to the "plasma" here. LCD does not emit light, but passes it through liquid crystals, so the picture turns out to be somewhat blurred in comparison with the clear and contrast image that the plasma display gives. In addition, the picture on the "plasma" does not blink and looks more realistic.