Patent ID: 8659529

Claim:
A signal line driver circuit comprising: a shift register; a latch circuit, electrically connected to the shift register, comprising a plurality of unit circuits, wherein each of the plurality of unit circuits comprises: a pair of current source circuits, wherein each of the pair of current source circuits is configured to receive a set signal and a signal current, and to control a value of an output current depending on a value of the signal current; a first switch, wherein the first switch is configured to select a current source circuit from the pair of current source circuits for receiving the signal current; and a second switch, wherein the second switch is configured to select a current source circuit from the pair of current source circuits for outputting the output current; and a changing over circuit electrically connected to the plurality of unit circuits and a plurality of signal lines, wherein the changing over circuit is configured to select one unit circuit from the plurality of unit circuits for electrically connecting to each of the plurality of signal lines, and wherein the shift register is configured to output the set signal.