It seems like there are inconsistencies when you search for model info. I see that it is described as being a TFT display in some instances and LCD in other places and LED in others... whats the story?
An LCD monitor can have an LED backlight (as opposed to a CCFL), but that's different from an OLED monitor. However, I see no indication on Amazon, Newegg, or even the Acer website that the GD235HZ has such an LED backlight.