The same here with my negative LCD display screen too. The haze on mine is everywhere too. I also believe just like you do that it’s on the LCD too because from certain angles the LCD screen is very dark and you cannot see the haze. But from a 45 degree angle you can see the haze. Especially at the angle while holding the steering wheel in my car when driving while the sun shines on the watch. When this occurs, that’s when I can see the haze everywhere on the LCD display. Maybe there’s some sort of a layer of film that’s on top of the LCD display that clouds up causing haze to appear when it ages after a few years. Or maybe something like a particular material inside the watch is emitting a gas which causes degassing making it get on to the LCD display causing the hazing. Whatever it is, it definitely originates somewhere inside the watch case and module. I’m surprised that Casio hasn’t noticed this problem or mentioned anything about this problem especially with these particular Pro Trek modules being around for the last 5 years.I don't believe the screen is STN. The haze is all over the screen, more or less strong in some places. I have the impression that it is on the LCD, from certain angles it is very dark and we cannot see it. Maybe it's the quality of the LCD itself that is in question. She dont come from Singapore .