What is the difference between TFT-LCD & LCD, which is better?

In this article,hola-led technicians and everyone will analyze the difference between TFT-LCD and LCD. Which is better between TFT LCD screen and ordinary LCD screen?

What does TFT-LCD screen mean?

TFT-LCD liquid crystal screen is also called thin film transistor liquid crystal display screen. In simple terms, it can be regarded as a layer of liquid crystal sandwiched between two glass substrates. superior. When the current passes through the transistor, the electric field changes, causing the liquid crystal molecules to deflect, thereby changing the polarization of the light, and then using the polarizer to determine the light and dark states of the pixels.

In addition, the upper glass is bonded with the color filter, so that each pixel contains three colors of red, blue and green, and these red, blue and green pixels constitute the image on the panel.

Which is better, TFT-LCD or ordinary LCD?

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

TFT-LCD can have a larger display area than other LCDs. There are dozens of TFT-LCDs on the digital city now, while other types of LCD screens generally do not exceed 20 inches in size. Now the good TFT-LCD vertical and horizontal viewing angles have reached 178 degrees, which is unmatched by other LCDs.

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

The resolution of the 1.3-inch TFT chip for liquid crystal projection is XGA with 1 million pixels. The film thickness of the 16.1-inch TFT array amorphous silicon with a resolution of SXGA (1280 × 1024) is only 50nm, as well as the TAB ON GLASS and SYSTEM ON GLASS technologies, the integration of its IC, the requirements for equipment and supply technology, and the technical difficulty Both exceed conventional LSI. Low voltage application, low driving voltage, improved safety and reliability of solidified use; flat, thin and light.

(3) TFT-LCD screen advantages: good display quality, low harmful radiation

TFT as a matrix addressing circuit improves the light valve characteristics of liquid crystal. For high-resolution displays, precise control between objects is achieved through voltage regulation in the 0-6V range (typically 0.2 to 4V), making it possible for LCDs to achieve high-quality high-resolution displays.

Now people start to integrate the driver IC on the glass substrate, the function of the whole TFT will be more powerful, which is unmatched by traditional large-scale semiconductor integrated circuits.

No radiation, no flicker, no damage to the user’s health. In particular, the emergence of TFT-LCD e-books and periodicals will bring mankind into the era of paperless office and paperless printing, triggering a revolution in the way of human learning, dissemination and recording of civilization.

(4) TFT-LCD screen advantages: low production cost and many manufacturing processes

Glass substrates and plastic substrates 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 sputtering, CVD (Chemical Vapor Deposition) MCVD (Molecular Chemical Vapor Deposition) and other traditional processes for film formation, laser annealing technology has also begun to be applied, which can produce amorphous films, polycrystalline films, and single crystal films. Not only silicon films, but also other II-VI and III-V semiconductor thin films can be made.

(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 the TFT-LCD after temperature strengthening treatment can reach minus 80 ℃.
  • It can be used as mobile terminal display, desktop terminal display, and large-screen projection TV.
  • It is a full-size video display terminal with excellent performance.

The liquid crystal flat panel display based on TFT technology is a pillar industry of the information society, and the technology 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 the market space of other LCD screens and CRT monitors in large-size display screens with its huge advantages in various aspects.


Hola LED