AMOLED, PMOLED, and Crystal LED have their pros/cons.
PMOLED is generally not practical at large screen sizes due to the incredible brightness needed at sub-microsecond levels (when hitting high dotclock frequencies). You can impulse-drive an AMOLED by using a rolling-scan algorithm, see
http://www.blurbusters.com/high-speed-v ... ster-oled/
A japanese paper showed this diagram:
Discrete LED (Also known as Crystal LED in the miniaturized TV-sized versions) is typically used by Times Square jumbotrons, stadium jumbotrons, and the big screens seen outdoors throughout Las Vegas. Most of them are sample-and-hold because they need to keep LEDs on for long periods to have maximum brightness (no strobing). So they will have motion blur, an image persistence equal to frame length (e.g. 60Hz = 16.7ms persistence = 16.7 pixels of motion blurring during 1000 pixels/second).
All of them (PMOLED, AMOLED, and discrete LED) can be strobed to reduce motion blur. PMOLED by its own behaviour is very flickery. However, it's not easy to scale PMOLED reliably to huge resolution sizes at high refresh rates because as you raise the dotclock, there is less time to light up each pixel. The on-time for each pixel is shorter because there are more pixels to illuminate, so you have to flash each pixel much brighter to compensate for the short time period of the flicker. PMOLED at 1920x1080p could easily achieve microsecond-league persistence, but the image might be too dim to be useable. If a whole scanline is illuminated at a time, you are still using strobe lengths in the tiny fraction of a millisecond league (135KHz horizontal scanrate at 1080p@120Hz suggests a 1080p120 PMOLED persistence of roughly 1/135,000th of a second = 74 microsecond persistence. Ouch. Where are you going to get the light output for a bright 1080p120Hz image on a PMOLED? At 0.074ms persistence, you would need to be roughly 112 times brighter than a 120Hz sample-and-hold AMOLED, in order to stay as bright as a non-strobed AMOLED. (8.3ms frame cycle at 120Hz divided by 0.074ms persistence = 112 times the light output if you flash for only 1/224th the amount of time).
Much easier (for law of physics) is a rolling-scan algorithm, and achieving more practical persistence of about 0.1ms to 2ms.
Currently, 2ms pixel illumination length is probably a practical goal to aim for initially (that appears to be common strobe length for LightBoost/ULMB/BENQ Blur Reduction/Turbo240) as it requires an OLED only ~4x brighter at 120Hz, to achieve same brightness as non-strobed. However, shorter is even better where possible -- my eyes are able to tell apart 0.5ms, 1.0ms and 2.0ms persistence based on my testing on fixed-firmware XL2720Z's (adjustable persistence all the way to 0.5ms) during fast panning motion at ~3000 pixels/second at
http://www.testufo.com/photo and other fast-panning/strafing/turning tests running at framerate==refreshrate. There are strong points of diminishing returns occuring at 0.5ms persistence. If rolling-scan AMOLED displays can add a persistence(brightness) adjustment similar to the LightBoost % settings, a good adjustment range would be 0.5ms to 4ms (or even all the way to sample-and-hold).
To achieve 0.5ms persistence using a 120Hz refresh (an 8.3ms refresh cycle), you will need ~17x brightness to keep the screen as bright as non-strobed (8.3ms/0.5ms = 16.6). So you can see 0.5ms and 1.0ms is still quite aggressive, given OLED still has some difficulty pushing out enough brightness to achieve short persistence needed. However, the manufacturers are working on solving the OLED light output issue, and we should eventually be able to get the light output necessary for CRT-clarity AMOLEDs -- probably more easily than bright large-format PMOLED.
PMOLED flicker by necessity, while AMOLED can optionally be made to flicker (for the purposes of lowering persistence -- motion blur reduction). Technologically, it is much easier to make an AMOLED flicker, than to scale PMOLED brightly to current HD sizes. The question is: Convincing display makers to release a 120Hz rolling-scan AMOLED for the gaming market -- at affordable prices.