Difference between TFT and LCD.

And again the confusion of concepts. If you are trying to determine the difference between monitors or televisions, which someone called TFT and LCD, then you have been misled. Try to spot the differences between the bus and Icarus? Between a dog and a neighbor's Bug? Between a fruit and an apple? That's right, the occupation is useless, because both objects are both at the same time. So it is with screen matrix technologies: LCD is the general name for a class of displays, to which TFT belongs.

Definition

TFT-matrix - active matrix LCD-display, made on the basis of the use of thin-film transistors.

LCD - flat panel display (and a device based on it) based on liquid crystals.

Comparison

LCD-displays are not an invention of our century. The screens of electronic clocks, calculators, devices, players are also liquid crystal, although they differ significantly from the screens of smartphones or TVs we are used to. True, at first LCDs were monochrome, but with the development of technology, they flourished in the RGB gamut. TFT is also a kind of LCD-displays, the production of which is based on an active matrix on thin-film transistors. If you compare it with the earlier version of LCD, a passive matrix, it becomes obvious that the color quality and response time of TFT are much higher. A twisted polymer is used as crystals in passive matrices. But the power consumption and cost of passive matrices, called STN, can please anyone. However, monochrome screens in this regard will generally look like prize money, but there will hardly be many who want to watch such TVs.

The principle of the TFT is that each of the TFTs drives a single pixel. There are three transistors per pixel, corresponding to the RGB primary colors (red, green, and blue). The intensity of the light flux depends on polarization, polarization depends on the application of an electric field to liquid crystals. TFT assumes an increase in the level of performance, contrast and clarity of the resulting image.

It is worth noting the disadvantages of TFT matrices, eliminated in other technologies. The image quality is directly dependent on the ambient light of the screen. Transistors at any of the pixels can fail, which leads to the appearance of "dead spots", or dead pixels. Not a single screen can be insured against this. In addition, TFT matrices are largely energy-intensive, so their use as displays for mobile electronics forces one of the most important properties to be compromised - autonomy.

Thin-film transistors, which formed the basis for the operation of liquid crystal matrices, today have practically crossed over to another camp: OLED screens use them to control their active matrices. There are no longer liquid crystals, but organic compounds.

Conclusions TheDifference.ru

  1. LCD is a type of screen matrix based on liquid crystals.
  2. TFT is a kind of active LCD-matrix.
  3. TFT distinguishes itself from other LCD technologies by the use of thin film transistors.
  4. TFT-matrices are economical, provide a high-quality picture, but power-consuming.
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