A display becomes less viewable in a bright ambient light. This is true for both light emitting panels such as an OLED or for a transmissive LCD display that uses a backlight. In a bright ambient environment, the light from the sun competes with the light from the display and the perceived contrast goes down. We have two ways to deal with this intrinsic problem.
Building a stronger backlight unit behind the display or more efficient to guide the light from the source to the panel surface, It make the display viewable under sunlight
The transflective technology get enough light from a backlight unit to see the display in darker environments and under bright ambient conditions, light coming through the display is reflected. Such enhance the brightness on the panel surface not only from the backlight unit but also from the reflection.
