Patent ID: 7649516

Claim:
A light emitting device comprising a plurality of pixels, wherein: each of the plurality of pixels which is scanned in a number m row (where m is a natural number, and 1≦m) has a source signal line, a gate signal line scanned in the number m row, a current supply line, a switching transistor, a driver transistor, a light emitting element, and a voltage compensation circuit; the switching transistor, the driver transistor, and the voltage compensation circuit are structured using single polarity transistors of the same conductivity type; the voltage compensation circuit has a first transistor, a second transistor, a third transistor, a first capacitor, and a second capacitor; a gate electrode of the switching transistor is electrically connected to a writing gate signal line scanned in the number m row; an input electrode of the switching transistor is electrically connected to the source signal line; an output electrode of the switching transistor is electrically connected to a first electrode of the first capacitor; a gate electrode of the first transistor is electrically connected to a writing gate signal line scanned in a number (m−1) row; an input electrode of the first transistor is electrically connected to the gate signal line scanned in the number m row; an output electrode of the first transistor is electrically connected to the first electrode of the first capacitor; a gate electrode of the second transistor is electrically connected to the writing gate signal line scanned in the number (m−1) row; an input electrode of the second transistor is electrically connected to the gate signal line scanned in the number m row; an output electrode of the second transistor is electrically connected to a second electrode of the first capacitor; a gate electrode of the third transistor is electrically connected to the output electrode of the switching transistor; an input electrode of the third transistor is electrically connected to an erasure gate signal line scanned in the number m row; an output electrode of the third transistor is electrically connected to the second electrode of the first capacitor; a gate electrode of the driver transistor is electrically connected to the output electrode of the first transistor and to the gate electrode of the third transistor; an input electrode of the driver transistor is electrically connected to the current supply line; an output electrode of the driver transistor is electrically connected to one electrode of the light emitting element; and the voltage compensation circuit amplifies or transforms the amplitude of signals input from the input electrode of the switching transistor, and imparts the amplified or transformed signals to the gate electrode of the driver transistor.