Patent ID: 6492970
Filing Date: 2002-12-10
Classification: G09G

Abstract:
A liquid crystal display apparatus comprising:a liquid crystal panel having M units of pixels in a horizontal direction and N units of pixels in a vertical direction, each of the pixels including a switching element and a liquid crystal; a signal driving circuit for inputting display data and generating a tone voltage corresponding to the inputted display data so as to apply the tone voltage to one group of the pixels arranged in the horizontal direction and corresponding to the display data; a scan driving circuit for selecting, in sequence, any one group of the pixels arranged in the horizontal direction, the scan driving circuit applying a selection voltage to the selected one group of the pixels arranged in the horizontal direction and applying a non-selection voltage to the unselected other groups of the pixels arranged in the horizontal direction, the liquid crystal having, at one end thereof, an opposed electrode that is common to the respective pixels, the tone voltage generated by the signal driving circuit, when the selection voltage outputted by the scan driving circuit is applied to the switching element in each of the pixels, being applied to the liquid crystal through the opposed electrode so as to control a display luminance by an effective voltage value of the tone voltage toward the opposed electrode; a circuit for generating an alternating signal and a correction time-period signal, the alternating signal indicating alternating of an opposed electrode voltage applied to the opposed electrode, the correction time-period signal indicating a time period during which a correcting voltage is combined with the opposed electrode voltage applied to the opposed electrode; and an opposed electrode voltage generating circuit that, in accordance with the alternating signal and the correction time-period signal and with respect to the alternated opposed electrode voltage applied to the opposed electrode, adds an upwardly convex correcting voltage to the alternated opposed electrode voltage when the alternated opposed electrode voltage is a positive polarity voltage and subtracts the upwardly convex correcting voltage from the alternated opposed electrode voltage when the alternated opposed electrode voltage is a negative polarity voltage.