Patent ID: 7855704

Claim:
A liquid-crystal-device control circuit comprising: a plurality of pixels corresponding to intersections between scanning lines in a plurality of rows and data lines in a plurality of columns, each pixel having a grayscale level based on a data signal supplied to one data line when each scanning line is selected; a scanning line driving circuit that, in first and second fields obtained by dividing the period of a frame, selects the plurality of scanning lines by performing: in one field of the first and second fields, first selection for selecting a scanning line in one row, the selected scanning line serving as a base; second selection for selecting a scanning line which is m rows away in one direction from the scanning line selected in an immediately preceding selection, where m represents an integer not less than 2; third selection for selecting a scanning line which is (m+1) rows away in an opposite direction from the scanning line selected in the second selection; and alternate repetition of the second selection and the third selection; and in the other field of the first and second fields, fourth selection for selecting a scanning line in one row, the selected scanning line serving as a base; fifth selection for selecting a scanning line which is m rows in the opposite direction from the scanning line selected in an immediately preceding selection; sixth selection for selecting a scanning line which is (m−1) rows away in the one direction from the scanning line selected in the fifth selection; and alternate repetition of the fifth selection and the sixth selection; a data-line driving circuit which supplies, to the data lines in the plurality of columns, a data signal having a voltage based on a grayscale level of one pixel corresponding to each scanning line selected, and in which, when the scanning line is selected in each of the first selection, the third selection, and the fifth selection, the voltage of the data signal is set to be higher or lower than a predetermined reference voltage, and, when the scanning line is selected in each of the second selection, the fourth selection, and the sixth selection, the voltage of the data signal is set to be higher or lower than the predetermined reference voltage; a counter that counts the number of horizontal lines included in a video signal supplied correspondingly to a region broader than pixels corresponding to the scanning lines in the plurality of rows; a determination circuit that determines which is greater between the number of horizontal lines counted by the counter and a value stored in a predetermined register; an addition/subtraction circuit that, depending on a result of determination by the determination circuit, adds a predetermined number to or subtracts the predetermined number from the value stored in the register; and a scanning control circuit which stores the value obtained by the addition/subtraction circuit in the register, and which defines start timing of the second field on the basis of the value stored in the register.