Patent ID: 7851796

Claim:
A camera comprising: an operation key; a shutter; an image receiving portion; and a display portion, the display portion comprising: a first, second, and third transistors, each comprising a source region, a drain region, and a gate electrode; an organic light emitting diode; and a power supply line, wherein source regions of the first and second transistors are connected to the power supply line, wherein the gate electrode of the first transistor is connected to the gate electrode of the second transistor and to the drain region of the second transistor, wherein the source region of the third transistor is connected to the drain region of the second transistor and the drain region of the third transistor is connected to a pixel electrode of the organic light emitting diode, wherein the first, second, and third transistors operate in a saturation range, and wherein the drain region of the first transistor and a gate electrode of the third transistor are connected to each other for a certain period in one frame period.