According to one embodiment, an RGB image signal is output from a driver, first ends of a first open-close signal line and a second open-close signal line are each connected to the driver and second ends of the first open-close signal line and the second open-close signal line are free. Power is supplied to a signal selection circuit, which selects a signal line and outputs a polarity inverted image signal, via the first open-close signal line and the second open-close signal line.