There actually are quite a few devices with transflective displays out there, and for quite a few years, too (at least ten IIRC). Most of them are in tablet for

There actually are quite a few devices with transflective displays out there, and for quite a few years, too (at least ten IIRC). Most of them are in tablet format, tough, marketed for the medical and construction industries. Panasonic has the Toughbook line of notebooks and used to sell them as outdoor capable. I don't know whether these use transflective/reflective panels or just really powerful backlights, though.