How to choose a tv lcd correctly
How to choose a tv lcd correctly
When there is a need to buy things, appliances, furniture, car, questions arise. Moreover, the more serious the purchase, so to speak, the more questions arise. Today we will talk about how to choose a LCD TV. What do you need to know before buying a TV? First and foremost, of course, you need to know what characteristics you need to pay attention to. Also no less important factor when choosing any equipment is the actual manufacturer of this technology. In the end, you need to decide on the price, color, size, and the like. You think: “Why do you need to find out something yourself, because for consultation there are sellers ?!”, nevertheless, if you know the main points that you need to pay attention to when choosing a TV, it will be easier for you to navigate among the diversity that represented on the modern market. So get ready to carefully read the recommendations on the choice of LCD TV.
How to choose a diagonal LCD TV
Let's start with the diagonal of the TV. Did you know that to ensure comfortable use of the TV, you need to calculate the distance between your location, that is, from the sofa, and the location of the TV? If not, it will be useful for you to get acquainted with the method of calculating this very distance. Everything is quite simple: the size of the diagonal increases 4-5 times and you get the most appropriate distance from the TV to the viewing point. You probably know that the diagonal is measured in inches. One inch equals about two and a half centimeters, let's calculate the distance for a TV with a diagonal of 32 inches (about 80 centimeters), we find that the distance should be equal to 400 centimeters or easier - 4 meters. Therefore, we offer you, so to speak, a little experiment: before buying a TV with a diagonal of 32 inches (well, or with another diagonal, just calculate the distance for it), move 4 meters and evaluate the transmitted picture. If the picture has pleased both you and your eyes, then do not hesitate, this TV is suitable for you, but, of course, do not forget to clarify other characteristics.
Matrix size or resolution of the LCD TV
The next thing you need to pay attention to is the resolution of the TV. To watch TV shows, a PAL or SECAM signal is used, which corresponds to a resolution of 720x576. What do these numbers mean? Let's start with the fact that the resolution is measured in pixels. A pixel is a small dot that has a normalized size and contains information about the brightness of three colors, red, green, and blue. Perhaps you have come across the abbreviation RGB, which just speaks about these colors: red, green, blue. Actually, from these points the image is formed on the screen. Pay attention to the resolution depending on the size of the diagonal. To view movies on an LCD TV, you need a higher resolution, for example, 1366x768. If you have digital television, then you need to choose a TV with an even higher resolution, for example, 1920x1080. In Russia, by the way, as in Japan and the United States, the very digital television is available.
Response time (English response time)
You, probably, noticed that the TV does not turn on soon. The nature of the LCD TV is such that in order for the image to appear, it is necessary to wait until the crystals move from the initial position to the extreme.Did you know that in a horizontal position only white can be seen, and black becomes available only in an upright position. This time of moving the crystals is called the response of liquid crystals. Why do you need to know about this very response time? And this characteristic is very important, because the image quality depends on it. If the response time will be large enough by the standards of this characteristic, then be ready to watch the image overlay, the “train” that these images leave. You have to agree that it’s pleasant enough, but I don’t want such a picture to spoil watching your favorite programs or films every time. The response time of modern models of LCD TVs is usually, or rather, should be no more than 8 milliseconds. If you will be offered TVs with a larger figure, it is better to leave this store altogether, and suddenly say that TV offers with a response time of more than 8 milliseconds are not permissible.
Contrast and brightness
Very important characteristics are the contrast and brightness of the LCD TV.We will understand how these parameters affect the quality of the image. So, if the contrast of the TV is small, then, alas, the rich color palette will remain hidden from your eyes. In general, at the present stage, TVs have no problems with this parameter. Most often, LCD TVs have a contrast ratio of 600: 1. Yes, the contrast is measured in a ratio, and the dark portions of the image are related to the light areas. The ratio of 600: 1 indicates that the image of dark areas differs from the image of light colors by 600 times. There are also models with a ratio of 800: 1, which, by the way, is more preferable, and with a ratio of 1200: 1. You probably realized that the higher the ratio, the better the quality of color rendering. As already noted, the ratio of 800: 1 you will be more than enough.
Let's go to the brightness. It seems that it's not a secret to anybody that viewing a dark image is not at all useful to your eyes. Those who have a laptop, probably tried to reduce the brightness of the display in order to preserve charging away from power. Probably, many will agree that a few hours of work on a dark screen is not the most pleasant thing in life.We will understand the brightness indicator for the LCD TV. Choose models in which the brightness indicator is not less than 450 cd / m2. In general, this figure is a standard for many models, however, if you stop your choice on that model, which indicator will be, for example, 600 cd / m2, then you should not, of course, panic and abandon this TV only in terms of brightness: this is not a disadvantage, but also a valid value, so if you get a model with a brightness lower than the standard, then you should think about it, or rather - immediately refuse.
By the way, the progress is progress and that nothing stands still, in connection with which such models of LCD TVs appeared, which have a built-in determinant of the level of illumination in any room. Accordingly, the brightness is already changing automatically, adjusting to the changes in the room, which provides you with a more comfortable "contact" with the TV. About this feature, automatic brightness adjustment, you can clarify with the purchase, and if there is such a function, then consider yourself lucky, do not even doubt your choice.
The next point we’ll talk about is the viewing angle, which also requires special attention. You will understand what is at stake if you try to look at the screen to the side of its center: you will notice that the contrast has decreased and the colors have changed. It should be noted that the further you move away from the center, the stronger the distortion will be. So, remember that the minimum viewing angle in both vertical and horizontal planes is 160 degrees. If you watch the TV at an angle of two times less than permissible, that is, at an angle of 80 degrees, then wait for the contrast to decrease by as much as 10 times. Modern models do not know the problems with these parameters and have a viewing angle of about 180 degrees, mostly - 176-178 degrees. So all that is required of you is, what is called, not to “run into” an outdated model of an LCD TV, which most likely has an indicator below the permissible value.
So, we got to the sound. Indeed, the picture is a picture, but the sound is also not unimportant. A modern digital amplifier is attached to modern LCD TVs, which ensures maximum clarity of sound.In general, the LCD TV should have a two-loudspeaker system, which consists of four speakers and tweeters (no, no, we're not talking about a social network). Pay attention to the components of this system: the speakers must be at least six centimeters in size, and twitter - at least two. The sound quality is estimated by the speaker power of the speaker system. From the school course, many people remember that the unit of measurement of power is Watts. But let us turn to the technical side of this question. Experts in this field will tell you right away that essentially this parameter has no effect on the sound quality. But these are specialists, and manufacturers will indicate extreme power and will assure you that the higher the power, the better the sound quality. Let's see what the quality of the sound really depends on, then you can resist active consultants, most of whom simply try to "shove" the goods, and not help with the choice.
So, the main parameter of sound transmission is its intensity, which is measured in decibels. Then the abbreviations will go: P is power, I is intensity, W is Watts, dB is decibels (recall the physics problems). If we bring the intensity formula: I = 10 * log (P), then it becomes clear that the relationship between power and intensity is measured by a logarithmic scale. To become even clearer, let's turn to the numbers. So, we have two TVs with a power of 20 W and 100 W, we calculate the intensity, we get 13 dB and 20 dB, respectively. The difference in power is 80 W (a rather large number, isn't it), and the difference in intensity is 7 dB. Those who studied well in 10th grade remember that the sound power doubles at 10 dB, but speaking about doubling the sound power, we should understand that the difference is really quite small. Now, probably, it is clear to everyone that TVs with a power of 20W and 100 W practically do not differ from each other, and insatiable managers believe that there is, but we, after all, will not fall for them, right?
You probably should not turn to the next calculations, because we don’t need them, it’s enough to know the approximate standard. So, if the manufacturer honestly indicates the rate of 10 watts per channel, then you can safely take this TV and enjoy high-quality sound. We need to pay attention to whether there are speakers on the TV, such as DolbySurround or SRS TrueSurround, which provide the effect of presence (quite a pleasant thing).If you want to surprise the consultant, then ask him about the efficiency of the columns (KPDK). By the way, this parameter should be paid attention when using the speakers. The coefficient shows what sound pressure is created at a distance of 1 m from the speaker when the power is 1 W. And if the consultant will offer models with a higher ratio, then you can be sure that he is surprised by your knowledge that he will not even dare to offer you something that is not very high quality, and you yourself will know that the higher the coefficient, the better.
LCD TV Inputs / Outputs
Well and, of course, it is impossible to disregard connectors and exits. The latest models of LCD TVs have a standard set of outputs and inputs, which include composite, component, S-video and SCART. If you have a DVD player and a digital camera, then you definitely need a TV with digital inputs and outputs, otherwise consider that this technique (camera and player) will no longer be useful to you. Note that the desired connectors are DVI and HDMI. I think it makes no sense to describe these connectors in detail, it’s enough to remember that they should be (for a start, of course, you need to remember their names, or rather, abbreviations).Well, we note that HDMI makes it possible to digitally receive, in addition to video, also an audio signal.
Since technology dominates the world, and you know for sure that there is a lot of different equipment in your house, let’s figure out how to connect it to an LCD television. Good old "Vidic" and not new models of video cameras can be connected in analog form, respectively, requires analog inputs - composite (Composite, VHS) and component S-Video (S-VHS) cables. To connect composite cables, you need a cinch connector (scientifically –RCA), and a component cable requires an S-Video connector. Note that the latter cable provides a better analog signal, and, therefore, a better quality picture on the TV.
In order to connect an LCD TV to a DVD player, camera or camera, you will need an AV cable that will allow you to view images through the TV screen. In addition to this cable, there is another way to connect a video camera or a VCR with an LCD television set, this is European standard SCART. Thanks to Philips, who insisted on the introduction of this European standard.
We examined how to connect devices with signal transmission in analog form, which is the main drawback. To get a higher quality video transmission, it is better to use USB or HDMI, which is in almost all new models. For more convenient use, these inputs are transferred to the front panel of the TV.
It is difficult to get tired of talking about the domination of technical means in our age both in the article and in life. So we note that important for your future TV is the presence of slots for connecting different types of memory cards. If you have a camera or an MP3 player, you can watch photos on your TV or listen to music. In general, with this you should not have problems, because modern LCD TVs have everything your heart desires. By the way, we advise you to choose a model with several digital outputs, so that you can connect several sources at the same time (all for your comfort).
So, the main parameters that should be paid attention to when choosing an LCD TV. Let's finally consider a few more nuances.You need to understand and firmly weigh those or other characteristics that are available for your future TV. So, if your LCD TV is equipped with a second TV tuner, this means that new frontiers are opening up for you. For example, now you have the opportunity to record more channels in memory (as much as twice). Especially this function will please those who have a cable or a plate. Also, thanks to the second TV tuner, you can watch TV in Picture-in-Picture mode. What is Picture-in-Picture? This is an opportunity to watch two TV channels at the same time, or rather, not to watch, but to follow the news on one channel, and the other to watch. It is very convenient for those who actively follow sports competitions (especially important for olympiads). Well, the second TV tuner is, of course, not a necessity, so before going to the store you will need to sit and think about how you want to see your future LCD TV. Do not forget to take into account the basic parameters that we have dismantled, and the color, design, additional, so to speak, “gadgets” - this is the second plan.
The most popular firms for the production of LCD TVs are firms SONY and Panasonic. Actually, for their name, these companies wind up the price of their goods, so you can buy no less high-quality TV in companies LG, Philips and Samsung, because the price issue when choosing any product is not unimportant. In general, do not make purchases in a hurry, carefully weigh everything, and then go for the TV of your dreams, which will please you with all the available parameters and, of course, the price.
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