A contrast-adjustable display via an organic light-emitting device includes a
transparent
substrate, a light-detectable unit, a current-detectable unit, an organic light-emitting
unit, a driving unit and a controlling unit. The light-detectable unit for detecting
an external light intensity is formed on the transparent substrate, and then generates
a current intensity based on the external light intensity. The current-detectable
unit for detecting the current intensity is connected to the light-detectable unit.
The organic light-emitting unit is formed on the transparent substrate for generating
light. The driving unit connects to and drives the light-detectable unit and organic
light-emitting unit, respectively. The controlling unit is connected to the current-detectable
unit, and controls the driving unit depending on the current intensity.