Focus LCDs

0 to 4. Zero if it is passive and 1 to 4 if active. The more transistors, the sharper the image/contrast, but also the higher the cost.

Yes. TFTs can be active (1 to 4 transistors per pixel) or passive where the screen is refreshed. The more transistors, the higher the cost.

IPS is a TFT. It is a display where there is one or more transistors attached to each pixel. A TFT can also be passive which means there is no transistors, but the screen is refreshed.

IPS is lower power and offers wider viewing angles

Yes, OLEDs are thinner than TFTS.

TFTs do, although the life span of half-life of OLEDs is getting longer.

Yes, it is possible to make a round TFT,

This would be a custom LCD and the cost is very expensive and has a high MOQ

No, LEDs are DC (Direct Current) and do not create noise that can be seen on CCFL and EL backlights that are AC driven

I think you mean what is a COB LCD?

COB stands for Chip on Board. That means there is a Printed circuit board attached.

The lowest cost method to add heat to a display is to add several resistors around the glass.