LCD TV is

Currently, on the shelves of shops there are many very diverse equipment, which differs not only in functionality, but also in appearance. The television market was no exception. Yesterday it was possible to meet many different models of TV devices, which differed in dimensions and colors. Now it is difficult for an inexperienced user to choose among equally flat displays that differ only in diagonal size.

However, to say that the presented technique is the same means to lie, because TVs currently, if they do not differ in appearance, then differ in functionality, as well as the technology for displaying the image on the screen. One of the first flat-screen televisions was liquid crystal devices.

LCD TV - a description of when it appeared

Initially, liquid crystals were discovered in 1888, later in 1927 the so-called "Fredericks effect" was discovered. This effect consists in the ability of a surface molecule of a crystal to change position when exposed to an electromagnetic wave. It is on the Fredericks effect that the principle of operation of LCD displays is based.

In simple words, an LCD device consists of small cells, in each of which there are crystals, which under the influence of voltage change their optical properties. Each crystal is highlighted with special illumination, and many of these cells form an image.

REFERENCE! The very first LCD screens appeared in the 70s, were black and white and were used mainly in electronic clocks and measuring instruments. In 1987, the public was presented with the first color LCD screen with a diagonal of not more than 3 inches.

LCD TVs have replaced the devices that work with the kinescope. They gained their popularity due to the relatively small size and high image quality. Also, LCD TVs have a relatively low price, which also makes them very attractive.

At the moment, such TVs come in a variety of models, which differ in both dimensions and diagonal size, and image quality.

How to choose an LCD TV

In order for the choice of TV to be competent, the main criteria should be highlighted. For which you should choose such a device.

  1. Resolution. This parameter is directly responsible for the quality of the picture and is determined by the size of the vertical and horizontal sides in pixels. At the moment, the best devices are screens with a resolution of UHD, which has a dimension of 3840 by 2160 pixels.
  2. Aspect ratio. This is the ratio of width to height. There are a variety of models, but standard ones usually have a ratio of 4: 3, 8: 5, 16: 9, etc.
  3. Contrast - this parameter characterizes the ratio of the brightest and darkest points on the monitor. Usually manufacturers increase this parameter due to the fact that they make the black color darker, which allows to achieve new contrast values.
  4. Brightness. The amount and intensity of light that the screen emits.
  5. Response time. The speed of switching brightness within a single cell. Measured in milliseconds.
  6. Viewing angle. This parameter displays the angle at which the image does not distort and does not lose the main parameters.

In order to choose the best TV model, all these parameters should be taken into account, as well as the matrix model, the quality of the manufacturer’s products, and, of course, the price range. Indeed, often, the higher the price, the better the parameters of this device.

Watch the video: Why you can't fix an LCD tv with a cracked or damaged tv screen (March 2024).

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