Common types of LCD display screens

Common types

*STN

STN (STN LCD) is the abbreviation for "Super Teisted Neural", which belongs to the passive matrix LCD, and almost all black and white screen mobile  LCD screens are made of this material. The color super-twisted nematic display screen is to add a color filter on the basis of the monochrome super-twisted nematic display screen, and divide each pixel in the monochrome display matrix into three sub pixels, and display red, green, and blue colors through the color filter, thus realizing the color screen. Due to technical limitations, super-twisted nematic display screens can only have 65536 colors at most. Most of the STN products seen in the market are 4096 colors, so STN is also called "pseudo color".

*GF

GF is the abbreviation of "Glass Fine Color", and perhaps everyone is unfamiliar with GF LCD screens because there are very few digital products using GF LCD screens on the market. In fact, GF is a type of STN, and its main feature is that the brightness is improved while ensuring low power consumption, but GF LCD screens have some color deviation.

*TFT

TFT is the abbreviation of "Thin Film Transistor", also known as "True Color". It is an active matrix LCD screen/TFT LCD DISPLAY, which is composed of thin film transistors. Each LCD pixel is driven by thin film transistors. Behind each pixel, four independent thin film transistors drive pixels to emit color light, which can display 24 bit True color color depth. In terms of resolution, the TFT LCD screen can reach a maximum of UXGA (1600 × 1200）。

TFT arrangement has memory, so it will not be restored immediately after the current disappears, thus improving the shortcomings of super-twisted nematic display screen flickering and blurring, effectively improving the effect of LCD screen displaying dynamic pictures, and more prominent ability in displaying static pictures. TFT LCD screen has the advantages of short response time and bright colors, so it is widely used in notebook computers, DV, DC. The disadvantage of TFT LCD screens is that they consume a lot of power and have a high cost.

*TFD

TFD is the abbreviation of "Thin Film Diode". Due to the high power consumption and cost of TFT LCD screens, which greatly increases the cost of the product, EPSON has developed TFD technology specifically for mobile phone screens. It is also an active matrix LCD screen, and each pixel on the LCD is equipped with a separate diode, which can control each pixel separately, so that each pixel will not affect each other, This can significantly improve resolution and display dynamic images and colorful colors without dragging.

In terms of performance, TFT LCD screen takes into account the advantages of TFT LCD screen and super-twisted nematic display screen. TFT LCD screen has higher brightness than super-twisted nematic display screen, and its color is also more bright. At the same time, it saves more power than TFT LCD screen. However, it is inferior to TFT LCD in color and brightness.

*OLED

OLED is an abbreviation for "Organic Light Emitting Display", also known as an organic light emitting display screen. It uses organic light emitting technology, which is the latest display technology. OLED display technology is different from traditional liquid crystal display methods. It does not require backlighting, but instead uses a very thin organic material coating and glass substrate. When there is current passing through, these organic materials will emit light, so its perspective is large, The content on the screen can be clearly seen from all directions and can be made very thin. Moreover, OLED displays can significantly save electricity and are known as "dream displays".

Strictly speaking, OLED is not a LCD screen, it is LED technology. The technical core of LCD screens is in Japan; The core technology of OLED is located in the United States and has been mass-produced in South Korea. It is used on Samsung's most popular mobile phone in South Korea, with an exceptionally high price, even higher than the price of a smartphone.

However, OLED is not without its drawbacks. As it is still an immature technology, its lifespan is relatively short and the screen area is relatively small at present.