Among the screen display effects of several common LCDs with different color screen materials, TFT>TFD>UFB>STN
TFT liquid crystal adopts "back transmission" and "reflection" phases. The way of combination is to set up a special light pipe on the back of the liquid crystal. The liquid crystal is equipped with a semiconductor switch for each pixel, and its processing technology is similar to that of large-scale integrated circuits. Since each pixel can be directly controlled by point pulses, each node is relatively independent and can be continuously controlled. This design not only improves the response speed of the display screen, but also accurately controls the display grayscale, so TFT liquid crystal The colors are more realistic, the display effect is the best, the contrast is the strongest, the visual effect is the most gorgeous, and the power consumption is the largest.
TFD (Thin Film Diode), whose Chinese name is Thin Film Diode, is a new type of liquid crystal display technology developed by Japan's Seiko Epson specifically for mobile products such as mobile phones and PDAs. Its technical feature is to make the display screen more precise. Purity, more vivid colors, and avoidance of serious afterimages like STN allow each pixel on the display screen to be controlled by a separate diode, making the effect quite excellent, but it is still a little worse than TFT. In terms of actual effects, TFD's screen color saturation and response time are very good. P408 uses TFD screen.
UFBUltra-Fine&Bright screen material is Samsung’s patented product, which is ultra-thin and high-brightness. It is said that the contrast ratio of the UFB LCD is twice that of the STN LCD, and the brightness is comparable to that of the TFT display at 65536 colors, while it consumes less power than the TFT display, and the price is about the same as that of the STN display. It is said to combine the advantages of these two existing products into one. However, in actual display, there is still a clear gap between UFB and TFT, and it is still not good compared to TFD. The difference between UFB and TFT is that TFT displays real-life images very well, with clear details, but cannot display cartoons. UFB displays real-life images in black, with a slight color cast in details, but the effect of displaying cartoons is first-rate.
STN LCDs are mainly light green and orange. However, if a color filter is added to a traditional monochrome STN liquid crystal display, and each pixel in the monochrome display matrix is ??divided into three sub-pixels, and the three primary colors of red, green, and blue are displayed through the color filter, it can be displayed Out of color. STN type liquid crystal is a reflective LCD device. Its advantage is low power consumption, but the clarity is poor in a relatively dark environment, so it has to be equipped with an external lighting source.
If you simply consider the display effect, TFT is undoubtedly the best. If you also need to consider some cost-effectiveness, TFD is better, but there are still very few machines on the market. UFB intervenes between TFD and STN, which is not bad. The STN display effect is obviously a notch worse