Patent ID: 7583257

Claim:
A signal-line drive circuit comprising: a shift register; a video-signal current source; a circuit for supplying a latch pulse; a latch circuit comprising: a first switch electrically connected to the video-signal current source; a second switch electrically connected to a signal line; a first logic circuit electrically connected to the shift register, and to the circuit; a second logic circuit electrically connected to the shift register, and to the circuit; a first current source circuit having: a first terminal electrically connected to the first logic circuit; a second terminal electrically connected to the first switch; and a third terminal electrically connected to the second switch; and a second current source circuit having: a fourth terminal electrically connected to the second logic circuit; a fifth terminal electrically connected to the first switch; and a sixth terminal electrically connected to the second switch, wherein at least one of the first current source circuit and the second current source circuit comprises a thin film transistor, and wherein an integrated circuit is used to form the video-signal current source.