The development of technology goes forward with seven-mile steps. We will try to keep up with her and choose a suitable TV home.
For user convenience, simplified remote controls with minimum features have been developed.
Modern models of LCD TVs with screen sizes 42 can also be used as "traditional" TVs, and as a home theater component
The world's largest 80 plasma panel
57 LCD TV
Most often for home theater, plasma panels are used with the side aspect ratio of 16: 9
Location TV, you must arrange it relative to the windows so that the sun's rays do not reflect from the screen. This location makes the most comfortable
An important characteristic for TVs is the screen viewing angle. Than it is wider, the more opportunities at the viewers with the convenience of staying in front of the TV
Matrixes in LCD TVs provide a picture without distortion
An attractive feature of plasma panels and LCD TVs is their relatively small thickness and weight, allowing you to hang them on the wall as paintings
The brightness of modern plasma panels is so large, which allows them to use them without any restrictions and the need to darken the room even with bright sunlight
New word in projection TVs, LCD models. ETT tube replaced by three LCD matrices
LCD TVs have the smallest thickness among all types of devices.
Projection liquid crystal TVs are often used as a home theater component. This service can enjoy watching the next exciting cinema masterpiece
The latest image quality improvement technology provides a striking realistic image.
Modern LCD TVs are distinguished by a wide viewing angle, which simplifies their placement.
Thanks to the appropriate connectors, modern plasma panels are used to connect a computer- for both working and recreation.
Using the "Picture in the picture" function, you can, without switching the main image, get acquainted with the content of other channels
Even relatively inexpensive models of TVs are equipped with a pair of loudspeakers in order to reproduce stereo
In the TX-51P100H model, a 2-way speaker with 4 speakers, reproducing rich, surround sound
Compact widescreen LCD TV with W-XGA panel 26, surround sound Virtual Dolby and desktop stand
When placing the source of the image in niches, it is necessary to provide its good ventilation.
TV with function "picture and picture" (PAP)
Twenty years ago, the classification of teleceptors in the world was greatly simplified. All devices were divided into stationary (as they wrote, "with the trim of the body with valuable wood") and portable ("equipped with comfortable handles for transportation"), colored and black and white. Poly-meter diagonals, "plasma" and "liquid crystals", flat or widescreen screen, high definition, sweep frequency and stereo sound light minds. If we have reflected, then abstractly as the future flights on Mars.
Today the situation has changed. New and Improvements that have found their embodiment in modern TV models, please us at every step. Moreover, in the world now there is a real "screen revolution", a change of epochs. Abroad, the kinescopic TVs gradually pass positions, the volume of their production is reduced, the liquid crystal screens and plasma panels come forward, between the manufacturers of which, in turn, there is a brutal competition for the consumer. Ana heel on screen TVs already occurs video projectors, giving an image with a diagonal to several meters, as in the present cinema (we will talk about them in a separate article). It is not surprising that a person who wishes to buy a new TV will inevitably collide with a whole pile of specific information, to figure it out in which it is quite difficult with unusual.
Fire, water and electron beam tubes
The extensive television "Park" has several thousand annually updated models. Their companies from Europe and Southeast Asia are present in Russia. Calculated Favorite TV manufacturers include Fujitsu, Hitachi, Matsushita Electric Industrial (Brand Panasonic), JVC, Nakamichi, Nec, Pioneer, Sony Corporation, Sharp Electronics, Toshiba (all-Japan), Samsung Electronics, Daewoo Electronics, LG Electronics (South South Korea), Thomson (France), Loewe (Germany), Philips (Netherlands). Some companies, such as Samsung, JVC, LG or Sony, produce almost the entire spectrum of reproducing image of devices with screens of any sizes. Other manufacturers prefer to specialize in a particular type of devices (so, Japanese fujitsu, Hitachi, NEC and Pioneer firms with their priority to the development and production of plasma panels, and SharP-TVs with liquid crystal screens). Competition on the market of television devices is more than tough. Famous manufacturers constantly feel pressure from less famous companies, such as Akira, TCL (China), Rolsen (Russia-Korea), domestic Polar and Sokol.What are the electronics manufacturers offer? First, it is good to all famous kinescopic televisions. The source of the image in them is an electron beam tube (kinescope). Its visible surface (screen) can be flat and slightly convex. Some "lenses" of modern convex screens, of course, does not matter any comparison with TVs that produced twenty years ago, and almost does not affect the preview of the view. Nevertheless, even a slightly convex screen meets more and less, mainly on models with the smallest diagonal. The fact is that the curved surface has the unpleasant ability to "glare" - capture the light from the lateral lighting sources and focus it on the observer. Flat kinescopes discard the highlights much less, and, moreover, almost all of them are equipped with additional means of absorption of external rays. Included, their screens seem almost black. Along the way, you can note the other advantage of such kinescopes, they better reproduce the dark details of the image ("shadows"). After all, the "most black" color that is capable of playing a similar flat screen, simply corresponds to the color of the disabled electron beam tube.
As a rule, modern kinescopic TVs are produced with a screen diagonal of 14-29. The most popular screen formats are 20-25. Such models are distinguished by a moderate value ($ 150-350) and a high quality image. On small screens, we are less noticeable for all kinescopes, the geometric distortion of the picture or the deviation of the rays along the edges of the screen (the white line acquires parasitic rainbow contours). Manufacturers that produce televisions with diagonals from 29 are forced to use complex systems of automatic adjustment of the image, because of this, the cost of products is growing. Thus, the models with a diagonal of 29 stand about $ 500-1000, and with a diagonal of 32- about $ 1400-1500. Kinescopic TVs with a diagonal of over 38 are projection. The image increases and is fed to the screen through a special optical system of lenses. Most often there are projection televisions with a diagonal of 42 to 61-62. This, for example, model 61cvh9ur (Toshiba), HV-44PRO (JVC). Their cost, depending on the size of the screen, ranges from $ 2,000 to $ 7,000.
Along with the Kinescopic, projection televisions that use LCD and DLP-matrices technologies have recently appeared (see the article "The Future will show"). Such devices are distinguished by high quality pictures and relatively small mass. An example of TVs using LCD technology can serve as the KF-50SX300, KF-60SX300 (Sony) model, and the DLP- new L3 and L7 series from Samsung.
In addition to the adjustment and quality improvement systems (such as, for example, a progressive sweep or digital comb), many kinescopic TVs are equipped with a set of service functions that have previously characterized only by the models of the highest price category. Among such new features are the display mode "Pictures in Picture", stereo sound, sound adjustment systems, an increase in zoom image fragment and even embedded computer games. We will discuss more about this below.
Liquid, like ... Crystal
Another type of device-televisions with a liquid crystal screen (LCD or LCD panels, from English Liquid Cristal Display). Liquid crystals are used, singular liquids, molecules in which are arranged ordered. Under the influence of the electric field, the molecule is capable of changing spatial orientation. Externally, it looks like a change in the transparency of the crystal. Such screens will not shine themselves, they need to be highlighted using the lamp located behind them. A high-altitude screen of the screen is a matrix consisting of separate rectangular fragments (cells). The transparency of each cell is set autonomously, using the so-called thin-film transistors embedded in the TV screen (TFT- Thin Film Transistor-liquid crystal TVs are sometimes also called TFT panels).
Each point element of the image (pixel) is formed as a result of the addition of signals from cells of three basic color-red, green and blue (RGB system). Accordingly, the number of cells on the matrix is very large. Let's say, when resolving the screen 1024768 pixels, the number of cells will be more than 2.35 million. If we consider the precision accuracy required in the manufacture of these matrices, it is not surprising that the price of large-size liquid crystal screens remains quite high yet. The first color LCD TV with a screen diagonal 3 and using TFT technology has released Sharp in 1987.
Why did all these liquid crystal tricks needed? The fact is that such devices have many advantages. The LCD screen allows you to get a picture of very good quality, with high definition and detail, without geometric distortion and flickering of the image. In addition, such TVs differ in durability (the service life of Sharp models is at least 60,000 hours, or 20 years of daily 8-hour work), low power consumption, compactness, small thickness, low mass (compared to plasma devices) and full lack of harmful impact on the user. LCD panels are relatively (again compared to "plasma") limited dimensions of the screen diagonals. Kartu summer 2004. The largest available on sale was the 46-inch television flow LTP468W from Samsung. However, there are already experimental samples of LCD TVs with a diagonal of 52 (LG) and 57 (Samsung).
Among other flaws (practically surrounding in most modern models, but found in earlier samples), you can mention a limited viewing angle. If you look at the screen a little on the side, the brightness immediately falls, the picture quality deteriorates. Sometimes a parasitic loop appears for fast moving objects. The last effect occurs due to the low speed of response of liquid crystal panels. Therefore, for LCD TVs, a very important characteristic is the so-called maximum response time, which in modern models does not exceed 12-15 ms, which practically leads to the elimination of the loop (compared with obsolete models in which the response time was 40-50 ms).
Who plasma in hand?
The third popular type of devices for playing the image are plasma panels (abbreviated PDP panels, from the English Plasma Display Panel). It uses the same principle of building a picture using a matrix, as in LCD TVs, but it is realized in a different way. The image is obtained with the help of a phosphora substance applied to the inner side of the glass screen and glowing under the influence of ultraviolet radiation, which occurs in the discharged gas when the electrical discharge is excited. Daylight lamps are similar in commonplace, with the only difference that the design of plasma panels is immeasurably more difficult to make millions of microlamp with light filters. The image obtained using these devices is extremely high-quality, very bright picture (much brighter than even in projection TVs), without geometric distortion, arising from the fault of the scan block (it is simply not in plasma panels). Even such TVs have other indisputable benefits, compact sizes and a small mass. Even in models with the largest screens, the thickness of the case does not exceed 8-10 cm (for diagonals up to 50). In addition, these devices are safer for health than their comrades with kinescopes, since they are not sources of harmful electromagnetic radiation.Kminus plasma panels include their high price (approximately 2-3 times higher than projection TVs with a similar diagonal of the screen), but prices, however, are steadily decreasing. Another disadvantage of plasma panels consume a relatively large amount of electricity, heated is very much during operation and therefore require an effective air cooling system. Another trouble-phosphor is prone to burnout. With a long show of fixed pictures on the screen, faded traces remain, for example, from television logos. Only in the newest models of the panels there is protection from burnout: the image can be periodically shifted horizontally or vertically to the shares of the millimeter. Another way to prevent burnout is the so-called burden. An image of a white field in the highest gradation of brightness is supplied to the screen for several tens of minutes. This method deletes the following traces well, although simultaneously reduces the life expectancy of the luminophore. But in general, according to the total service life (the period behind which 50% of brightness is lost) plasma TVs have almost already caught up with liquid crystal. For new models, this indicator is 50- 60 thousand hours.
Dignity and plasma panels, and LCD TVs is the ability to play a digital signal without converting it to analog, which is used only in kinescopic models. It is very convenient, as it makes it possible if there is a DVI or HDMI connectors with the appropriate connectors to the device, the digital signal sources, for example, to play the image from the DVD player through a digital outlet outlet. Plasma panels with a screen diagonal from 32 (KE-32TS2 from Sony, 32pd5000TA from Hitachi, 32PF9965 from Philips) and up to 63 (P63XHA30ES from Fujitsu, PS-63P3 HR from Samsung), and in the fall on the world market, models with diagonal 71 will appear in the world market (LG). The maximum size of the plasma screen submitted to the public at the moment, 80 diagonally (Samsung). It is curious that if manufacturers of ordinary TVs face constructive difficulties in the development of large diagonals, then in the production of plasma panels, on the contrary, it is difficult to make models with a small diagonal of the screen. Optimal with the ratio of "price-quality", according to many manufacturers, are panels with a diagonal of 42. The average cost of such devices is $ 3000-8000.
Through what we look into the future?
Despite the individual disadvantages inherent in kinescopic TVs, in Russia the overwhelming majority of the population prefers while using them, especially for the reception of analogue airlock. The fact is that Russian TV channels are broadcasting in the SECAM broadcasting standard developed over forty years ago, today by obsolete (however, Europe uses even more ancient standard-PAL). Frame in SECAM is formed from 576 working lines, which are transmitted in two minutes, first all odd, and then all even lines. Such a number of rows plus the presence in an analog interference signal reduces the benefits of plasma and LCD panels. But as for the correctness and quality of color reproduction, the display of the details "in the shadows" and the contrast of the image, then here and the "liquid crystal", and the "plasma" are still approaching TVs with an electron beam tube. Therefore, in cases where the TV is acquired mainly to view conventional television programs, the choice of kinescopic models will be fully justified.
Another thing, if satellite television is assumed as a source of a television signal (for example, "NTV-Plus") or a DVD player that give a picture without interference and a high level of quality. In this case, plasma panels and liquid crystal TVs are out of competition, especially if the data transfer from the source to the reproducing unit is carried out as a digital signal (see article "Veni, Vidi, DVD!" In №11 for 2003). To do this, both devices must be equipped with special connectors for transmitting information in digital form. Today it can be DVI (Digital Visual Interface) or HDMI (HIGH-DEFINITION MULTIMEDIA INTERFACE). Older DVI (he has already been three years old!) Allows you to transfer data at a speed of up to 2 Gbit / s, and completely fresh HDMI- up to 5 Gb / s.
Both interfaces are fully compatible with each other. Another HDMI advantage is that this connection is designed to transmit not only the image, but also sound. What is especially convenient if you need to "voice" not a home theater, but a separate plasma or liquid crystal panel equipped with a built-in acoustic system. The only minus plasma panels and LCD TVs (and other devices, such as DVD players) with the HDMI connector are rarely found. From the last models, you can mark LTP468W LCD TV (Samsung), equipped with digital connectors of both types and PDP-434HDE plasma panel (Pioneer).
Another significant point is the selection of the diagonal and screen proportions. Here again, it is important where the TV will be installed and what is supposed to look at it. The size of the diagonal is also selected depending on the distance between the screen and the audience. Comfortable for viewing and safe (if it comes to kinescopic TVs) the distance in 3-5 diagonals of the screen is considered. Therefore, in small rooms in terms of bedrooms and kitchens, it is most often installed televisions, a kinescopic or LCD, with a diagonal to 21. At the same time, the higher the image quality, the closer you can be on the screen. Daily pipe TVs equipped with a scanning system with a frequency of 100 Hz, the screen flicker is almost imperceptibly (compared to old models that have a scan frequency of 50 Hz). Therefore, watching such TVs is comfortable with a distance of 3 diagonals. Even closer, plasma panels and LCD televisions can be placed, the main thing is that it is not noticeable "grain" (such TVs are recommended at a distance of 2.0- 2.5 diagonals).
Modern TVs are available with the aspect ratio of the screen 4: 3 and 16: 9. The latter provide a widescreen image. Therefore, such TVs are very convenient exactly as a component of the home theater system (when receiving a signal from a DVD player or satellite antenna). The Solid Party, to reproduce the ordinary essential television signal transmitted in Russia in 4: 3 format, of course, better fit devices with a similar aspect ratio.
But if you need a universal TV, usually used widescreen models. In addition, the display of 4: 3 format pictures is possible in several ways. The easiest to use only part of the screen, leaving on the sides, on the right and left, dark stripes (although they occupy a lot of not enough to 25% of the area of the entire screen). Another option is proportional to the image increase using the zoom function (there are many modern TVs). True, here part of the image will turn out, on the contrary, cut off over the upper and lower edge. Extreme models there is a possibility of non-linear stretching of the picture on the entire screen. At the same time, its central part retains its proportions, however, the periphery, where the default the secondary parts are located, is distorted. As you can see, all the ways have their drawbacks. To say that here the smallest evil is impossible.
Currently, a number of technologies have been developed designed to improve the color reproduction of the picture, contrast, get rid of interference and defects of the image, which, apparently, the considerations of political correctness are called artifacts. Among the latest technical innovations are the following:
3D dnr. (Digital Noise Reduction, Philips) - noise reduction technology that serves to adjust the image in dynamic scenes at which the number of parasitic artifacts on the screen is reduced. It is used in all types of TVs. Do not confuse with analogically indicated noise reduction system in JVC digital cameras.
Fine System (LG) - a special digital device to automatically optimize brightness and clarity of the image. Used in televisions with an electron beam tube.
True Matrix Imaging Technology (Pioneer) - a matrix with a deep "waffle-rib" structure for obtaining bright images, even in the literal sunlight. Applied in plasma panels.
Alis. (Alternate Lighting Of Surfaces, Fujitsu, Hitachi) - a technology based on the principle of illumination of the plasma panel screen with even and odd electrodes alternately. This technology has made it possible to obtain a small pixel size with a resolution of 10241024 pixels, to provide the highest level of contrast and brightness, as well as increase the service life of plasma TVs up to 60,000 hours of operation in the usual video mode.
ASV. (Advanced Super View TFT Display, Sharp) - a new distribution technology of the directions of the axes of the orientation of molecules in the screens of the LCD TVs. Provides a wide screen viewing angle (170), fast response time and high contrast image.
C.A.T.S. (Contrast Automatic Tracking System, Panasonic) - automatic contrast adjustment system. Automatically determines the level of external lighting and adjusts the brightness and contrast for the best picture quality under any external conditions. Reduces power consumed and reduces screen burnout.
DCI (Sony) - technology designed to provide an even and sustainable image on large-sized LCD TVs.
Digitotal Technology. (Polar) - digital processing technology, allowing to obtain an image and sound of high quality in the presence of interference in the ethereal signal.
D.I.S.T. (Digital Image Scanning Technology, JVC) - Technology for converting signals with interlaced scanning to signals with progressive scan (see article "Veni, Vidi, DVD!"). Technology D.I.S.T. Allows you to increase the number of lines of the horizontal scan and, therefore, the resolution vertically, as well as to eliminate the "cog" of the diagonal boundaries of the image and improve the detalation of the picture. It is used in all types of television devices.
DNLE. - Digital image optimization technology (samsung), providing the most realistic image on any screen and with any broadcast format. The new version, DNLE 3, allows you to achieve even higher definition, due to the algorithm of a six-time increase in the density of the points: horizontally three times, vertically twice. Used in all types of devices.
DRC100. (Sony) - technology that increases the resolution of the image vertically and horizontally, eliminating the shake of the image. Due to the double frequency of the regeneration (100 Hz), the DRC100 function makes the TV shows less tedious for the eyes than at a conventional frequency of 50 Hz. Audvoic number of pixels horizontally makes the image clearer. It is used in all types of devices that reproduce the image.
Pixel Plus 2. (Philips) - a new version of digital image improvement technology. Used with plasma and LCD panels. Pixel Plus 2 improves color reproduction and increases resolution, color reproduction and contrast.
Plasma Reality. (Panasonic) is a combination of technologies (Adaptive Brightness Intensifier, Real Black Drive System and Real Gamma Correction), which improve image quality and providing a high level of brightness, contrast and clarity of the picture.
XD Engine. (LG) Optimizes the image, removing the shake and distortion of the picture on a wide screen free from static electricity, and also avoids the loss of saturation of colors. Used in plasma panels and LCD TVs.
Charms unobtrusive service
The general trend for all types of telepremits is equipped with a large number of additional features, such as busy, amplifying a weak signal, demonstrating a teletext, "Picture" function in the picture and a number of others. We will tell about them in more detail.Automation is automatic to ensure the trouble-free operation of the TV at large voltage drops. The television is equipped with a built-in voltage stabilizer. As a rule, the bus station is produced within 150-260V, but there are televisions and other bands, from 100 to 300V. Most often, this feature is available from domestic kinescopic TVs, for example 54CTV4929 (POLAR), 54 TC 8739FS (Sokol) and imported budget class models specially trained for the Russian market. It can be very useful in the operation of the equipment wherever the voltage level in the network does not differ in stability. Of these conditions, it often can be needed and an amplifier of a weak signal that eliminates the problem of not high-quality image for the domestic television network.
The "Picture" function in the picture provides simultaneous playback on the screen of programs of two different channels. It can be implemented in different ways: either a small picture in the corner of the screen on a large background (designated PIP, from the abbreviated Picture in Picture), or two images are played nearby (pap-picture and picture), without overlapping each other. It should be noted that the "picture in the picture" significantly increases the cost of the TV, since an additional tuner block is required to implement it. Two tuners are found only in relatively expensive television vehicles, as a rule, in models worth over $ 800 (kinescopic televisions with a diagonal of 29, LCD TVs with a diagonal of 14-15). There is also a simplified version of the "pictures in the picture" with one tuner. The presence of such a function affects the cost of the TV. Multiple channels on the screen are not displayed, but only a signal from one channel and one external source, such as a video recorder. Another variant of this function is the so-called "multi-color" (MULTI PIP). The screen is divided into a large number of windows (9, 12 or 16), which allows you to simultaneously view the same number of different channels.
Among other useful functions, you can mention the teletext support system (these are information text messages transmitted by the stations in parallel with telecasts) and the built-in timer required to turn the TV on and off at the right time. Also, when choosing a telephone player, you should pay attention to this, whether to manage it easily. Multifier majority management occurs with the remote control, so it is important to assess the convenience and logic of the location of the buttons on its panel, their dimensions, explanatory inscriptions. For the elderly, it is possible that the remotes of a simplified design will fall, with a small number of buttons enlarged. Such devices are not included in the TV package, it is better to learn from the seller whether it is possible to choose something for this model. All remotes are usually universal, suitable for several types of TVs, their cost is about $ 10-20, such as, for example, Easyzapper SBC RU151 (Philips). The TV menu should be simple and understandable. Most of the models of the TV books are fully Russified, but make sure that it does not hurt.
For many buyers, an important point is the ability to display images from digital cameras and cameras. For ease of reading flash cards, some models are equipped with special devices. So, Sony is for MEMORY STICK cards. Amodel VU29 LCD TV (NAKAMICHI) perceives a signal from two other types of Card-Compact Flash and Smart Media. Perhaps in the future it is the type of memory supported memory that will affect the choice of household appliances. However, there are already TVs with a built-in universal memory card reader Wise Link (Compact Flash, Smart Media, Memory Stick, SD, MMC). This is a SAMSUNG WS-32A20 HEQ model.
In full sound
In recent years, the sound support of the essential programs (not to mention satellite television and DVD records) has noticeably added as. An increasing number of Russian TV channels switches to stereo mode, and some satellite- already carry out broadcasting with 6-channel Dolby Digital audio. It is not surprising that televisions are equipped with increasingly perfect acoustic systems or simply a pair of speakers to play stereo sound. Now such a sound occurs even in budget models with a diagonal of 14-21 and worth $ 150- 300. The astes perfect devices can be supplied with separate adjustment of the upper and low frequencies (54CTV4229, POLAR; KV-21FQ10K, SONY) and even built-in equalizer (TX-25P90T, Panasonic; C25M6 SSQ, SAMSUNG; RZ-23LZ40, LG; 54CTV4375, POLAR). Other TV books (PD- 42DV2, JVC) have an internal subwoofer.
Some, most expensive, television models have built-in Dolby Digital sound survey decoders (WS-32Z10 HVTQ, Samsung; Lenaro 82 MFW 82-6210 / 9 Dolby, Grundig, Germany; KZ-17LZ21, LG). On the basis of such a TV, you can collect a home theater without buying an additional AV receiver. More often, however, the TV shows are equipped with acoustic systems with the "surrounding sound" mode, simulating multichannel sound using two built-in loudspeakers. It can be Virtual Dolby (Thomson, LG, Sony, Samsung), Cinema Surround, 3D Cinema Surround (JVC). Assess the degree of reality of the sound or the "presence effect", which arises from this kind of acoustics, is best in listening rooms that are necessarily available in large audio and video equipment salons.
Extremely useful option - automatic adjustment of the sound level. Its problem is to exclude sharp jumps of volume levels when switching channels and sudden advertising inserts, which are usually very annoyed by the audience. Sound adjustment is found in both expensive and budget models of TVs, such as RT-21FC40 (LG), AV-2132W1 (JVC).
One word - picture!
Nevertheless, the main thing in any TV is a truly good image, because if the picture "dances", will not save either a sophisticated remote, nor an exquisite design of the case. Therefore, all the manufacturers of the world, as they strengthen, try to make the image as high as possible.For plasma panels and LCD televisions, the screen resolution is important, which can be 640480 points and more (see table). Theoretically, the higher the resolution, the more high-quality picture can be obtained subject to the use of a high-quality signal source (DVD). However, the high screen resolution parameters can be implemented only when it is connected to a computer or when receiving high-definition television gear, as well as on the basis of future DVD players created by Blue Ray technology. There are no such sources in the country (except for the computer) yet and will not be in the near future. Even DVDs are "written" with a resolution of only 720576 points. With regard to our conditions, the high screen resolution is, rather, the problem is rather advantageous because it is necessary to have a very good scaling processor to correctly transmit the image (a device that can correctly adapt our low definition signals to the high definition screen). It is for this reason that many well-known manufacturers, such as Panasonic, Sharp, do not seek to produce matrices with high resolution parameters, although it is quite forces from a technological point of view.
Permissions of plasma panels and LCD TVs
| Resolution, gv, points | Designation |
|---|---|
| 640480. | VGA. |
| 853480. | W-VGA. |
| 1024768. | XGA |
| 1024 852. | - |
| 1024 1024. | - |
| 1280 768. | W-XGA. |
| 1365 768. | - |
| 1600 1200. | UXGA |
| 1920 1080. | - |
Choosing a TV or panel, try to evaluate the quality of the resulting image. Tools are brought to the cabins, the TV books are connected to DVD players, which is why it is somewhat difficult to get a undischarged idea of the picture taken on broadcasting networks. Ask you to connect the TV to the antenna and evaluate how the ether signal will be perceived, knowingly inferior in its DVD characteristics. If you plan to view the video cassette, it is advisable to check the TV and on the quality of the image playback from the VCR.
Plasma panels and LCD TVs are poorly reproducing an analog signal from an antenna or video recorder. What you can do - initially they were not intended for this. However, in recent times, an increasing number of similar teleceptors is supplied with a high-quality built-in tuner that can cope with an analog signal. If the tuner is missing or gives an unsatisfactory picture, the situation can correct the remote device with a specially adapted data transmission bus (we will definitely talk in the future of our articles).
Very often, when choosing a television equipment, the consumer pays attention to such indicators as the maximum brightness and contrast of the screen. Hospital, there is no conjunction between manufacturers about how exactly performs measurements of these and many other parameters. So, the contrast for electronic radial tubes is measured by the images of black and white squares declined on the screen and is determined by the difference in illumination in the center of those and others. Molding some plasma panels The contrast acts as the difference between the most bright screen point and ... dark wall background. It is not surprising that in this case this parameter turns out to be highly high, although in fact, in these characteristics of the kinescopes, the "liquid crystal" and "plasma" differ not so much.
The same can be said about the "response time". Theoretically, this essential for LCD TVs means the time for which the total reorientation of all one hundred percent of the liquid crystal molecules in one, separately taken, the cell of the matrix occurs. In practice, in the time of the response, the time of partial reorientation of these molecules is implied when not all light is passed, but only its part (different manufacturers use different ways to measure the response time). In addition, the response time can be significantly changed on the same matrix depending on the initial and resulting colors (roughly speaking, with black on white-25 ms, and from white on black- 40 ms).
Liquid crystal molecules in the display work as a shutter of the camera, skipping light or not
Even, it would seem, such a simple and understandable value, as an angle of review, also happens "with a trim." Manufacturers usually mean not an angle itself, in which the image to maximum degree retains the declared brightness and contrast, but only their minimally acceptable values (for example, the contrast 50: 1 instead of 400: 1). It is not surprising that many well-known manufacturers (among those such, for example, Sony) have recently prefer not to inform the brightness information, the contrast of IT.P. to unwittingly do not mislead people. As they say, it is better to see one's own eyes once than to compare incomparable numbers.
In love case, the quality of the television image is best evaluated with a non-scattered light, as close as possible to the muted lighting of the living room. This is not always possible, but, on the other hand, the consumer understands well that the color flaws, an excuses "kitchen" TV, are completely unacceptable for the plasma panel selected for home theater. All "serious" TVs are recommended to be tested in Special Viewing Halls.
Just like some music lovers, choosing an audio system, prefer to use our own proven records, when buying a TV, also makes sense to prepare a magazine or a disk with a reference (for yourself) record. It does not have to be the most recent Hollywood blockbuster. It is better to take a movie that is familiar to the "large screen" so that it was with what to compare. The cinema will allow you to evaluate the correctness of the transfer of dynamic scenes, find out whether the details of the images are well transmitted.
To assess the geometric distortions arising from the screens of kinescopic televisions, it is best to use the most conventional tuning tables. All straight lines are required to remain straight, their maximum deviation in the corners of the screen should not exceed 3% (incremental models 2%). Small inscriptions must be well read both in the center of the screen and around the edges. Another defect is color defocus. Carefully look at the logos of television channels located in the angles of the image. Does it occur around white lines too noticeable rainbow shine? Plasma panels and LCD TVs should be viewed for "broken pixels". Defective pixels are visually determined easily. They look like constantly dark or, on the contrary, bright (colored) points on the screen. This deficiency is not amenable to correcting, and buying such a device is undesirable.
I want to recall once again that the TV is only a television signal receiver. Whatever advanced technologies in it are used, a low-quality "double" picture from a damaged or unconfigured antenna, he will not be able to correct. Deciding to update the TV, you need to take care and that the television signal is compared to it. For this purpose, not indoor antennas or video recorders, but more modern technique, about which we will definitely tell in the following articles.
The editors thanks the company "M.Video", Poloral, Russian Game, Hitachi, JVC, LG, Panasonic Companies, Philips, Pioneer, Samsung, Sony, Sharp for help in preparing the material.