The TV is not without reason considered one of the main inventions of the last century. Someone loves TV shows, and someone wants to watch football with a bottle of beer. And what joy on the faces of the kids when they watch their favorite cartoons with enthusiasm. Almost everyone watches TV, which means that sooner or later every family faces the problem of choosing this miracle of technology.
The choice of an LCD TV should be made not only on the basis of aesthetic preferences and the appearance of a particular model, but in accordance with the technical parameters declared on the TV. So, what you need to know when choosing an LCD, or as they say - LCD TV.
Diagonal size of LCD TV
This parameter is one of the main when choosing any TV, and especially modern LCD TVs, the diagonal of which has already crossed the mark of 50 inches, or 127 cm. If you are going to save your eyes from stress and get the most comfort from watching your new TV, then remember that the distance from which your favorite TV shows will be viewed should be 4 to 5 times greater than the diagonal of the TV screen. Therefore, if you bought an LCD TV with a diagonal of 32 inches (1 inch = 2.54 cm) - the distance to the viewing place should be between 3.25 m and 4 m.
Do not try to chase sizes, this is not the case when more is better. The sensation of dangling your head in an attempt to keep up with a rapidly changing image will not be the most pleasant moment.
LCD TV resolution
It is worth paying special attention to this indicator. The resolution of a liquid crystal TV, or the resolution of a TV matrix, is nothing more than the number of luminous cells (pixels) that create an image visible on the screen. A pixel is a small square (dot) that has a normalized size and contains information about the brightness of three colors (RGB - red (Red), green (Green) and blue (Blue). From these dots an image is formed on the LCD screen.
The value characterizing the resolution of an LCD TV is indicated as the ratio of the number of pixels horizontally to the number vertically. For example, if the technical specifications of the TV indicate a resolution of 1366 × 768, then this means that the screen is 1366 pixels wide and 768 pixels high.
If you want to watch only TV broadcasts, then remember that the transmitted signal in PAL or SECAM format, which is widely used in our country, corresponds to a resolution of 720x576 (720 lines in width and 576 in height). It is also used that this size has 720 pixels in width and 576 pixels in height. Therefore, if you want to purchase an LCD TV with a small diagonal, see that the resolution is higher than this size. For high-quality viewing of movies from a DVD player, a resolution of 1366x768 is already required, and to get full quality from a high-definition digital signal (HDTV) 1920x1080.
Although digital high-definition television has not yet found wide application in our country, but digital technologies bluе-ray in a couple of years can seriously press the DVD format that is so widespread today. Already now, having a media and a blu-ray player at hand, you can enjoy your favorite movie in HD quality. Naturally, if your TV supports a resolution of 1920x1080. Thus, saving on LCD TV screen resolution today may deprive you of many benefits and enjoyment in the future.
Viewing angle
Vertical and horizontal viewing angles, parameters that should not be underestimated when choosing an LCD TV. If you look at the screen from the side of its center, you can observe a sharp decrease in contrast and change in colors. As the distance from the center of the LCD TV increases, the distortion will only increase. The minimum allowable value of viewing angles in the vertical and horizontal plane is 160 degrees. This means that when watching TV at an angle of 80 degrees, the contrast will be 10 times less than if you watch TV in the center.
Modern LCD TVs should have viewing angles of the order of 176-178 degrees. Therefore, pay attention to this parameter so as not to buy an outdated LCD model, in which viewing angles may be less important.
Response time
In order for a color image to appear on the screen, which changes intensively when watching any TV programs, films, etc. liquid crystals, on which the technology for the production of LCD TVs is based, must move from the initial position to the extreme. For example, in a horizontal position, only white is visible, when they are flipped to a vertical position, only black will be visible. The time it takes liquid crystals to move from a horizontal position to a vertical position is called the liquid crystal response time. Therefore, the faster the response time, the better the color reproduction of the image will be. Otherwise, if the response time is of great importance, then when viewing dynamic scenes, fast-acting objects will leave a “loop” or one image will be superimposed on another. For modern LCDs, the response time should be no more than 8 ms (milliseconds, that is, 1ms = 1x10-3 s).
Contrast and Brightness
The contrast of an LCD TV is one of the most important parameters. If the contrast of the TV is low, then on the screen you will not see a rich color palette of images and a rich range of tones and midtones of color. However, recently this parameter has lost its particular relevance, since its qualitative characteristics have already reached very high values. LCD TVs have a contrast ratio of 600:1. This means that the darkest parts of the image differ from the lightest parts by 600 times. Naturally, the larger this ratio, the better the color rendering of the image will be. For modern LCD TVs, this parameter should be at least 800:1.
Some manufacturers may specify a contrast ratio of 12000:1. We are talking about dynamic contrast, which is achieved through the use of special adaptive algorithms, that is, through additional image adjustment. Therefore, you should not pay attention to this value, but the main value when choosing to betray static contrast.
Another equally important parameter of the LCD TV is the brightness of the image. If the brightness of the purchased TV model is low, then you will have to strain your eyes very much to see the transmitted picture of the image well, and in the daytime, watching TV programs can turn into torture. Therefore, the brightness of modern LCD TVs must be at least 450 cd / m2, this value is considered normal for watching television. If the brightness value of the purchased model is more than 450 cd / m2 (for example, 600 cd / m2), this will definitely not be a disadvantage of the LCD. Some models of LCD TVs have a built-in detector for determining the level of illumination in the working room. Depending on the measured value, the brightness of the TV changes automatically in order to achieve maximum comfort when watching TV shows and video files.
Sound
When choosing an LCD TV, pay special attention to the existing stereo system. Most modern models have a digital amplifier, which is used to ensure maximum sound purity. The LCD TV must have at least a 2-way speaker system consisting of 4 speakers and tweeters. The size of the speakers for comfortable sound perception should be at least 6 cm, and the size of the tweeters should be at least 2 cm.
In addition, pay attention to the presence of an equalizer in the TV settings, it will allow you to slightly adjust the same frequency characteristics of the sound to your taste.
Connection interface
The owner of a modern LCD TV can create a home entertainment center with the help of connected devices and use all the features of the TV to the fullest.
But in order to achieve this, your TV must have at least a minimum set of standard inputs and outputs:
Antenna input - designed to connect broadcast or cable television. You can connect a VCR.
Composite connectors - are present on almost any audio-video equipment, and are designed to transmit analog signals.
The S-Video input, like the composite connector, is designed to transmit an analog video signal with a maximum resolution of 480 i . Allows you to get a better image, because. provides separate transmission of the luminance signal (Y) and two combined chrominance signals (C) over independent cables.
Component inputs - designed to transmit a video signal in color components. Due to the separate transmission, the image is clearer, more stable, and with accurate color reproduction.
SCART ( Syndicat des Constructeurs d' Appareils , Radiorecepteurs et Televiseurs ) is a universal 21-pin audio-video interface for analog signal transmission in two directions.
RGB connector - used to connect to a computer. The image is transmitted directly to the screen, bypassing the TV processing processors.
DVI (Digital Video Interface) is a digital connector, when using which the signal is not subjected to any conversion, which reduces the likelihood of image noise.
HDMI (High Definition Multimedia Interface) is a digital multimedia interface that can simultaneously transmit up to 8 audio channels and a high-definition television signal (HDTV).
The coaxial connector is also digital. Always highlighted in orange and intended for transmission from a digital source.
Optical - again, digital, based on a fiber optic connection.
FireWire connector - is a bi-directional digital system for connecting camcorders or other digital recording devices.
Unfortunately, not all manufacturers equip their LCD TVs with all the listed inputs and outputs. Therefore, when choosing a TV, be sure to make sure that it has several digital outputs. Otherwise, during operation, a situation is inevitable when you have to manually switch between different devices. This, of course, is the case when you want to connect several signal sources at once, such as a DVD player, satellite receiver, computer, etc. And you will definitely want this, sooner or later.
So, we have considered almost all the characteristics of the LCD TV, which you will certainly have to pay attention to when choosing. Using all of the above recommendations will help you make the right choice in terms of price-quality ratio.
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May 2, 2024 00:44:23 +0300 GMT
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