I found this that was quite interesting:
What is the difference between reflective and transflective display?
Reflective displays are front-lit active matrix displays viewable by utilizing internal or external
light source, ideal for indoor or outdoor use. The rear polarizer of a reflective display includes a
diffuse reflector. This layer reflects polarized ambient light that has entered the front of the
display back through the LCD cell. Reflective displays require ambient light to be seen, with
high brightness, excellent contrast (14:1), and wide viewing angles. HP iPAQ handhelds using
the reflective LCD's are front-lit.
Transflective displays combine transmissive and reflective technologies utilizing internal or
external light sources. Transmissive displays have a clear polarizer on the front and the back.
The display depends on light coming through from the back of the display toward the user.
Reflective displays reflect polarized ambient light that has entered the front of the display back
through the LCD cell.
The benefits of transflective display are crisper images and clearer text, with rich color
saturation.
Where on earth can I get hold of some of this clear polarising film ?