A transflective - also known as transreflective liquid crystal - display (LCD) is one that is able to reflect most of the sunlight it is exposed to and automatically adjust its backlighting depending on the amount of light shining on it. This strongly reduces the need for manual light adjustment of the screen.
Transflective LCD displays combine the benefits of transmissive and reflective ones, which makes them equally readable in both bright sunlight and low-light conditions.