What is a TFT color screen?

TFT-LCD liquid crystal display is a thin film transistor type liquid crystal display, that is, "true color" (TFT). Each pixel of TFT liquid crystal has a semiconductor switch, and each pixel can be directly controlled by point pulse, so each node is relatively independent and can be continuously controlled, which not only improves the response speed of the display screen, but also accurately controls the display color level, so the color of TFT liquid crystal is more realistic. TFT liquid crystal display is characterized by good brightness, high contrast, strong layering and bright colors, but it also has the disadvantages of high power consumption and high cost. TFT liquid crystal technology accelerates the development of mobile phone color screen. Many new-generation color screen mobile phones support 65536 color display, and some even support160,000 color display. At this time, the advantages of high contrast and rich colors of TFT are very important.

TFT LCD is mainly composed of fluorescent tubes, light guide plates, polarizers, filter plates, glass substrates, alignment films, liquid crystal materials, thin transistors and so on.

TFD (thin film diode) screen, also known as thin film diode translucent liquid crystal display screen. TFD technology is jointly developed by Seiko and Epson, which is specially used on mobile phone screens. It is a compromise between TFT and STN, and its brightness and color saturation are better than STN, and it also saves electricity than TFT. The biggest feature is that it can provide high-quality and easy-to-watch display regardless of whether the backlight is turned off (reflective mode) or on (transmissive mode), and it has the advantages of low power consumption, high image quality and high response speed.

UFB LCD is a new type of mobile phone LCD released by Samsung in March 2002, which has the characteristics of ultra-thin and high brightness. UFB-LCD is a display screen specially designed for mobile phones and PDA. It has the characteristics of ultra-thin and high brightness, and can display 65536 colors, reaching the resolution of 128 x 160. The display screen also adopts a special grating design, which can reduce the pixel spacing and get better picture quality.

The contrast of UFB LCD screen is twice that of STN LCD screen, and its brightness is equivalent to that of TFT display screen in 65536 colors, but its power consumption is less than that of TFT display screen, and its price is similar to that of STN display screen, which can be said to combine the advantages of these two existing products.

Organic light emitting display (OLED) is a new product on mobile phone LCD, which is called "dream display". Organic light emitting diode display technology is different from the traditional liquid crystal display mode. It does not need backlight, and uses very thin organic material coating and glass substrate. These organic materials will emit light when current passes through them. In addition, the OLED display screen can be made lighter and thinner, with a larger viewing angle, and can significantly save power consumption.

At present, among the two technical systems of organic light-emitting diodes, the technology of low-molecular-weight organic light-emitting diodes is mastered by Japan, while the technology and patents of polymer PLED (the so-called OEL of LG mobile phone is the product of this system) are mastered by British technology company CDT. Compared with PLED products, colorization is still difficult.

However, although the OLED with better technology may replace LCD such as TFT in the future, the OLED display technology still has shortcomings such as short service life and difficult screen enlargement.