I was watching the in this world BTS and i saw these lines on their camera's lcd screen! I have a PD150 also and was wondering how to actavate that on my camera!
At alot of electronic stores, you can buy those little plastic membranes that come on new electronics screens, they sell packs of them for PDA's etc etc. What I think they did there was cut one out to fit the screen, and drew in the letterbox lines with a sharpie....
Actually, I taped my DVX LCD screen with Scotch tape "in a pinch" one time, and when I pulled it off, it left a permanent transparent mark . . . so I have permanent 1.85:1 lines on the LCD and can still see everything. Worked out pretty well . . .