How many kinds of screens are used on mobile phones now? What are they? What is the best?

STN, TFT, TFD, UFB, organic light emitting diode, ASV

STN (super twisted nematic) screen, also known as super twisted nematic LCD screen. A color filter is added to the traditional monochrome liquid crystal display, and each pixel in the monochrome display matrix is divided into three pixels, and the three primary colors of red, green and blue are displayed by the color filter respectively, so as to achieve the function of displaying colors, with light green as the main color and orange as the main color. STN screen belongs to reflective LCD. Its advantage is low power consumption, but its definition is poor in dark environment.

TFT (thin film transistor) is a kind of thin film field effect transistor, which belongs to an active matrix liquid crystal display. It can "actively" control each independent pixel on the screen, which can greatly improve the reaction time. Generally, the reaction time of TFT is relatively fast, about 80 milliseconds, and the viewing angle is large, which can generally reach about 130 degrees, and it is mainly used in high-end products. The so-called thin film field effect transistor (TFET) means that each LCD pixel is driven by a thin film transistor integrated behind it.

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. With ultra-thin and high brightness, it 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.

ASV(Advanced Super View) technology is another breakthrough of Sharp's LCD panel production technology, which is mainly used in Sharp's high-end LCD. This technology mainly improves the viewing angle, reaction time, color contrast and screen brightness of the LCD screen by reducing the spacing between particles on the LCD panel, increasing the aperture on the LCD particles and adjusting the arrangement of the LCD particles as a whole. Under the comparison of the same screen area, the parameters and effects of the screen with ASV technology are substantially improved compared with those of the ordinary LCD without ASV technology. For example, T 1520, T 1620, T 1820 and other series models are obviously superior in parameters and effects compared with the models with the same screen size on the market.

If the display effect is good or bad, it is ASV, TFT, organic light emitting diode, TFD, UFB, STN and CSTN in turn.

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