What is an OLED display module, OLED pros and cons, PMOLED and AMOLED screens

We can also achieve this with a TFT, with special color filters or Quantum Dot filters, but in general OLED is superior here without any special effort. The true black is related to the contrast. Super viewing angles, that is another advantage over the TFT. If we have a typical TFT, a TN display discussed in the previous lectures, we have grayscale inversion from one viewing angle. Then we have displays like IPS or MVA types, where we can see a picture from all the viewing angles but still the viewing angle would be like 85 degrees 87 or the best would be up to 89 degrees. In OLED displays we have 89 degrees without any effort because it is like a LED diode. It emits light, and we can see exactly the same from all the viewing angles. OLEDs can be very thin, because there are only a few layers, no backlight, no front layers, so they can be very thin and very light. We can build OLED displays on elastic surfaces that we can bend or can be curved, for example Samsung foldable mobile phones or some curved LG TV sets. OLEDs have low power consumption. If we have an LCD or a TFT, we need a backlight. The backlight is consuming a lot of power because the light is being consumed by all the layers that the TFT has: the polarizers, the color filters, diffuser; everywhere we lose a little bit of power from the backlight, so we need a lot of power to really have bright TFT. With OLED we have just a straight light from the pixels itself, so the power consumption can be low and lower than in a typical LCD. And we have a very wide operating temperature. We can go as low as -40 with OLED. There are no mechanical issues like with the LCD where we have liquid crystal inside the cell that in low temperature can become close to solid and cannot move anymore. Typically for TFT we have –20, -30 degrees, in some exceptional cases we have –40, but for OLED it is no problem to work even in -40 degrees. On the other hand, with high temperatures, you need to be careful because it decreases OLED lifetime, so you need to check in a spec or contact manufacturers if you require high temperatures for OLED. If it is for short periods, then it is fine, but if your OLED display need to work constantly in a high temperature, like 50, 60 or 80 degrees, then it is worth to check how it will affect the lifetime of OLED display.