Patent ID: 8305327

Claim:
A display device comprising: an array substrate; signal lines and scanning lines formed on the array substrate, the signal lines and the scanning lines intersecting with each other; a pixel formed at each intersection of the signal line and the scanning line on the array substrate; an amplitude expansion circuit formed for each signal line on the array substrate and configured to expand amplitude of an inputted analog video signal; a voltage shifting circuit formed for each amplitude expansion circuit on the array substrate and configured to shift a voltage of an analog video signal outputted from the amplitude expansion circuit; and an impedance conversion circuit formed for each voltage shifting circuit on the array substrate, the impedance conversion circuit having an output impedance lower than that of the voltage shifting circuit and configured to output, to the corresponding signal line, an analog video signal having the same voltage as that of the analog video signal outputted from the voltage shifting circuit; wherein each amplitude expansion circuit includes: a first capacitor; a second capacitor having one electrode grounded; a first switch configured to open and close between the other electrode of the second capacitor and an input circuit node of the analog video signal; a second switch configured to open and close between one electrode of the first capacitor and the ground; a third switch configured to open and close between the one electrode of the first capacitor and the other electrode of the second capacitor; a fourth switch configured to open and close between the other electrode of the first capacitor and the other electrode of the second capacitor; and a fifth switch configured to open and close between the other electrode of the first capacitor and an output circuit node of the amplitude expansion circuit.