STN is the early main display method, initially can only display 256 colors, after technical transformation can display 4096 colors or even 65536 colors, but now the STN is still 256 colors, the advantages are: low price, low energy consumption.
The brightness of TFT is good, high contrast, strong sense of hierarchy, and vivid colors. The disadvantage is that it is more power-consuming and more costly.
TFT (Thin Film Transistor), that is, thin film field effect transistor, belongs to the active matrix liquid crystal display in a kind of. It can “actively” control each individual pixel on the screen, which can greatly improve the response time. General TFT response time is relatively fast, about 80 milliseconds, and the viewing angle is large, generally up to about 130 degrees, mainly used in high-end products. The so-called thin-film field-effect transistor refers to the fact that each liquid crystal pixel point on the LCD is driven by a thin-film transistor integrated in its wake. TFT belongs to the active matrix liquid crystal display, in the technology of the “active matrix” way to drive, the method is the use of thin film technology made of electrode crystal, the use of scanning method “active pull “The light source is first transmitted upward through the lower polarizing plate when irradiated, and the light is conducted by the liquid crystal molecules to achieve the purpose of display through shading and light transmission.
The main components of TFT type LCDs include: backlight, polarizer, thin mode crystal glass substrate, flexible circuit board, and driver IC.
UFB is the abbreviation of Ultra Fine Bright. It is a special color display technology for Samsung cell phones. UFB is designed with special lenticular design which can reduce the pixel pitch for better image quality, and it features ultra-thin and high brightness. It can display 65536 colors and the resolution can reach 128×160. UFB display uses a special lenticular design that can reduce the pixel pitch to get better picture quality. UFB combines the advantages of STN and TFT: less power consumption than TFT and the price is about the same as STN.
STN (Super Twisted Nematic) screen, also known as super twisted nematic LCD screen. STN screen belongs to reflective LCD, it has the advantage of small power consumption, but the clarity is poor in the dark environment.
STN mainly has CSTN and DSTN, CSTN is ColorSTN, generally using the transmission (transmissive) lighting, transmission screen to use an external light source lighting, called backlight (backlight), lighting source to be installed in the back of the LCD. STN is the abbreviation of Super Twisted Nematic.
TFD (Thin Film Diode) screen, also known as Thin Film Diode Semi-Transparent LCD. TFD technology was developed by Seiko and Epson and used specifically in cell phone screens. It is a compromise between TFT and STN, with better brightness and color saturation than STN, and also more power saving than TFT. The most important feature is that it provides high image quality and easy-to-view display regardless of whether the backlight is turned off (reflection mode) or on (transmission mode), and has the advantages of low power consumption, high image quality, and high response speed.
OLED (Organic Light Emitting Display), that is, organic light-emitting display, in the cell phone LCD is a new product, OLED display technology and the traditional LCD display is different, no backlight, using very thin organic material coating and glass substrate, when there is an electric current through, these organic materials will be light. And OLED display screen can be made lighter and thinner, the viewing angle is larger, and can significantly save power consumption.
However, although the future technology is better OLED may replace TFT LCD, but organic light-emitting display technology also has a short service life, the screen is difficult to large-scale and other defects.
From the display effect can be basically considered amoled > Ltps > tft > tfd > ufb > stn