Patent ID: 7233302

Claim:
A display apparatus having a display panel in which light emitting units are arranged in a matrix each said light emitting units being constituted by a driving transistor for generating a drive current in accordance with a voltage applied to a control terminal thereof and a light emitting device for emitting light in accordance with said drive current, comprising: a reference control voltage generating circuit which includes a series circuit connected between ground and a power voltage, said series circuit being constituted by a current source for generating a reference current and a reference transistor having an input terminal for said power voltage, an output terminal to which said current source is connected, and a control terminal connected to said output terminal and having electrical characteristics substantially identical to said driving transistor and which produces a voltage on said control terminal of said reference transistor as a reference control voltage; and a data driver for supplying one of said power voltage and said reference control voltage to said control terminal of said driving transistor in accordance with pixel data of each pixel based on an input video signal, wherein said power voltage or said reference control voltage produced by said reference control voltage generating circuit is selectively supplied to data lines of said matrix of said light emitting units through said data driver.