Nowadays it is difficult to imagine a person, who has no TV at home. This invention is an integral part of any home whichever way you look at it. Because your family gathers together next to it nearly every evening, many TVs do not allow housewives to get bored in the kitchen. Using TV you watch news and sporting events, movies and soap operas, listen to music and learn something new every day.
Now even the most faultfinding buyers will be able to make their choice because the existing diversity of TVs on the market can surpass all expectations. Today you can’t surprise anybody with presence of USB connector, built-in hard drive, DVD player, a great number of connections and opportunity to use the Internet directly from your TV. What to choose for yourself? As apart from subsidiary capacities, TV has the main function – broadcasting of picture. Fifteen years ago there were only CRT TVs (otherwise known as the traditional tube televisions), and making your choice, you had to determine only diagonal and image quality. Now, they are replaced by plasma, LCD and LED TVs.
Let's have a look at these technologies. I don’t doubt that you’ve heard about them, but anyway, I’d like to offer you my review, you may find something interesting for you in it.
Plasmas - the constant element of the decor of dynamic video connoisseur. High brightness and contrast indices of plasma display allow you to watch it in any lighting condition, and the angle of view exceeds 160 degrees. These features provide comfort when you watch high-quality movies, easily achieving amazing effect of presence. The basis of each plasma panel - is a gas, composed of ions and electrons. An electric current, passing through the gas, causes a phosphoric coating of cells-pixels to glow with necessary color. The main advantage of plasma displays is a possibility to buy a thin panel with a wide screen. And major disadvantages are large pixel size, compared with LCD, and a panel resource, which in our time is about 40000 hours.
The principle of work of LCD TVs is built on the possibility to adjust the intensity of light that passes through the liquid crystals. These crystals respond to electric current and, depending on the level of tension, take their stand at a certain angle. Thus they pass through a necessary amount of light coming from a powerful lamp. Every tiny segment of the screen - pixel - consists of three elements (green, red and blue) which, when combined create the final tint and make picture colorful. As the pixels are very small, the onlooker ultimately sees a whole picture without any visible defects. The main advantages of TFT LCD technology are the fast response time of matrix, better quality of picture and long life panel (70,000 hours). The main disadvantage is a limited viewing angle compared to the plasma panel.
Latest development in this sphere is considered to be a LED technology. LED TVs are LCD TVs, but they have back panel with light-emitting diode. Grid lighting is used in this TV, LED rays have the form of grid, which switches off when your frame scrolls. For example, when a frame with dark scene on the background is played, LED grid which is placed on a dark piece turns off automatically. It helps to save energy and make dark scenes really dark. These TVs spend in the process of their work less power, but it is not as important as the picture quality and design of these devices. LED-TVs have more streamlined shape, give more intense and live picture, they can serve you longer, they are resistant to vibration and REALLY THIN.
These are main technologies nowadays.
Remember: Theatre is life. Cinema is art. Television is furniture.
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