Patent ID: 8059081

Claim:
A display device comprising: a display panel; a drive circuit which is formed on the display panel; a plurality of first level shift circuits which are formed on the display panel; at least one of second level shift circuits which are formed on the display panel; and at least one of selection circuits which are formed on the display panel, wherein: the respective first level shift circuits and the respective second level shift circuits include a transistor, each of the first level shift circuits has a different value of a drain resistance, each of the second level shift circuits has a value of the drain resistance, the value of the drain resistance being equal to a value of the drain resistance of at least one of the first level shift circuits, a first input signal is inputted to a source terminal of the transistor of the respective first level shift circuits, the first input signal having a high voltage level and a low voltage level, a second input signal is inputted to the source terminal of the transistor of the respective second level shift circuits, the second input signal having a constant voltage which is the high voltage level or the low voltage level, each of the first level shift circuits and the second level shift circuits outputs an output voltage from the drain terminal of the transistor, and the at least one of the selection circuits selects a final output voltage which is determined by comparison of the output voltage of at least one of the second level shift circuits and the output voltage of the plurality of first level shift circuits respectively.