Yeah I"m just guessing at the terrible refresh rate but my actual television has an alleged refresh rate of 8ms and ghosting is minimal. My pc monitor has no noticeable ghosting but it's a 4 or 5 ms screen. Given this and experience with other handhelds I"d estimate the psp screen has a 24ms screen. 16ms is the highest you can go and still basically avoid ghosting at 60fps and the psp ghosts like crazy at that framerate, in fact depending on the game even 30fps and lower ghosts like a damn haunted mansion. Also, something about the ms stat listed on monitors is that it's kind of a blatant lie to the consumer , the time listed is for grey to grey going from white the black can take 2 or 3 times as long. So yeah, I still figure the psp screen is a 24ms grey to grey model with times as long as 50 or 60 ms for certain colors, red for example seems to ghost so bad it looks like color bleeding.
It's not the worst screen though, the gba sp + that's been mentioned in this thread has low pixel refresh AND a low hz refresh making anything that scrolls go super choppy.
