Importance

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Abstract

The invention simplifies the configuration of a comparators circuit used in an electrooptic device or the like, in which gradation data is stored for each pixel, to realize lower power consumption, higher definition and multiple gradation. Transistors in which gradation data D0 to D2 are respectively supplied to the gate terminals, and transistors in which gradation signals P0 to P2 resulting from counting are respectively supplied to the gate terminals are connected to form a comparator circuit. When the gradation signals P0 to P2 are less than the results of reversal of the gradation data D0 to D2, the comparator circuit is placed into a nonconductive state, while when the gradation signals P0 to P2 are equal to the results of reversal of the gradation data D0 to D2, the comparator circuit is placed into a conductive state. As a result, a pulse signal PW can be produced according to the gradation data D0 to D2 to realize a gradation display in a sub-field driving system. Also, the number of the transistors constituting the comparator circuit can be significantly decreased, as compared with a related art technique.

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First Claim