When choosing a television, you should first consider whether you want a model with or without smart features. You should also consider the size, resolution, optimal viewing distance, refresh rate, type of tuner (terrestrial, cable or satellite broadcasting), and other practical functions.
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The most important parameter when buying a television is its size, with one simple rule – the bigger, the better. 3D televisions, with the help of special glasses, are able to deliver space perception to the viewer. Depending on the technology used, there are LED TVs, LCD TVs and plasma TVs. The individual specs can vary to a high degree, but the presence of a DVB-T digital tuner to receive terrestrial broadcasts is a must in every model. Some televisions boast DVB-C or DVB-S tuners to receive digital transmission over cable or satellite respectively.
Manufacturers have perfected the two technologies currently used, and although the principles of signal processing and display technologies are different, both guarantee an immersive experience. In addition to regular-sized models, LCD and LED TVs also come in small sizes (portable TVs), while plasma TVs usually feature larger diagonals.
LCD TV
LCD TV screens are thin and flat. They use liquid-crystal technology to display the picture. The image is made up of a large number of points, or pixels. Each pixel is composed of three sub-pixels (a red, a green and a blue one according to the RGB colour model). Utilising modern technologies, it is possible to control the luminance of each pixel individually, thus achieving millions of colour combinations. Unlike potentially eye-damaging CRT TVs, LCD technology is kinder to the eye and more energy efficient. Some of the most important parameters when selecting an LCD TV are the screen size, resolution, response time, contrast ratio, brightness and viewing angles.
LED TV
LED TVs use the same technology as LCD TVs, but they use bright LEDs for their backlight, ensuring better contrast and lower power consumption.
Plasma Television
Plasma televisions utilise ionized noble gases, neon and xenon. These gases are housed in small cells between two glass plates and when electrical energy is applied, the cell lights up. Three such cells (red, green and blue) form a single pixel. Combining various luminance intensities of the individual cells, the pixel gets its final colour, and all together they form the whole picture. Some important parameters to look for when selecting a plasma television are the diagonal size, resolution, contrast ratio, brightness and viewing angles.
3D TV
Three-dimensional TVs use two different technologies - active and passive. Active 3D technology requires a set of powered glasses, which dim the lenses in a regular rhythm, meaning your eye sees only the image intended for it. Passive 3D technology, on the other hand, uses polarised lenses, blocking half the lines and delivering only 1920 × 540 pixels. The advantage of the latter is a simpler design, which is reflected in a more affordable price, but the maximum resolution is lower than with active 3D technology.
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