Wikipedia notes this:

AMOLED displays may be difficult to view in direct sunlight. Samsung's Super AMOLED technology addresses this issue by reducing the size of gaps between layers of the screen.

http://en.wikipedia.org/wiki/Active-matrix_OLED

interestingly, the amoled display is very flexible -- that is, you can bend it quite a bit and even roll it into a scroll. we're getting closer to have e-paper with this stuff.