What is the difference between TFT-LCD and LCD? Which is better, TFTLCD screen or ordinary LCD screen

What does TFT-LCD screen mean?

TFT-LCD is also called thin film transistor LCD. In short, it can be seen as two glass substrates with a layer of liquid crystal sandwiched between them. The glass substrate on the upper layer is connected with the color filter, and the glass on the lower layer is embedded on it by transistors. When the current passes through the transistor, the electric field changes, causing the deflection of liquid crystal molecules, so as to change the polarization of light, and then use the polarizer to determine the light and dark state of pixels. In addition, because the upper glass fits with the color filter, each pixel contains three colors of red, blue and green. These pixels emitting red, blue and green colors constitute the image on the panel.

LCD segment code LCD screen

Which is better, TFT-LCD screen or ordinary LCD screen

(1) Advantages of TFT-LCD screen: large display area and wide display angle

TFT-LCD can have larger display area than other LCDs. At present, there are dozens of TFT-LCDs in the digital city, while the general size of other types of LCD screens is no more than 20 inches. At present, the vertical and horizontal viewing angles of good TFT-LCD have reached 178 degrees, which is unmatched by other LCDs.

(2) Advantages of TFT-LCD screen: high chip integration and good use characteristics

The 1.3-inch TFT chip for liquid crystal projection has a resolution of XGA and contains millions of pixels. Resolution is SXGA (1280 × 1024), the film thickness of amorphous silicon of 16.1-inch TFT array is only 50nm, and tab on glass and system on glass technologies. The IC integration, requirements for equipment and supply technology, and technical difficulties exceed those of traditional LSI. Low voltage application, low driving voltage, solid use, improved safety and reliability; Flat and thin.

(3) Advantages of TFT-LCD screen: good display quality and low harmful radiation

TFT as a matrix location circuit improves the light valve characteristics of liquid crystal. For high-resolution display, accurate control between objects is realized through voltage regulation in the range of 0-6v (its typical value is 0.2 to 4V), which makes it possible for LCD to realize high-quality high-resolution display. Now people begin to integrate the driving IC into the glass substrate, and the function of the whole TFT will be more powerful, which is unmatched by the traditional large-scale semiconductor integrated circuit. No radiation, no flicker, no harm to the user's health. In particular, the emergence of TFT-LCD electronic books and periodicals will bring mankind into the era of paperless office and paperless printing, and trigger a revolution in the way of human learning, communication and recording civilization.

(4) TFT-LCD screen has the advantages of low production cost and many manufacturing processes

Glass substrate and plastic substrate fundamentally solve the cost problem of large-scale semiconductor integrated circuits, and open up a broad application space for the application of large-scale semiconductor integrated circuits. In addition to using traditional processes such as sputtering, CVD (chemical vapor deposition) and MCVD (molecular chemical vapor deposition), laser annealing technology has also been applied, which can produce amorphous films, polycrystalline films and single crystal films. It can not only make silicon films, but also make other ⅱ - ⅵ and ⅲ - ⅴ semiconductor films.

(5) Advantages of TFT-LCD screen: wide application range and wide application field

It can be used normally in the temperature range from - 20 ℃ to + 50 ℃, and the low-temperature working temperature of TFT-LCD after temperature reinforcement can reach minus 80 ℃. It can be used not only as mobile terminal display, desktop terminal display, but also as large screen projection TV. It is a full-size video display terminal with excellent performance. Liquid crystal flat panel display based on TFT technology is a pillar industry of the information society. It can also be applied to the rapidly growing thin film transistor organic electroluminescence (TFT-OLED) flat panel display.

Since 2004, TFT-LCD has gradually replaced other LCD and CRT displays in the market space of large-size displays with its great advantages in all aspects.


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