Hello friend my grandfather bought this tv.This 50 Android tv is very good. My grandfather bought it online about 20 days ago. Wanted to write a review after experiencing the TV well. I didn’t expect this well working of the tv and very good display system actually. I didn’t really get to know what exactly is the image optimizing engine name. But the the picture quality is almost up to the mark of sony. The audio is also very good. 44K is actually the best price for it’f features. Good Luck Ridaex. Over all I will give 4.5 stars for Ridaex 50 4K TV.thankyou