Patent ID: 7903072
Filing Date: 2011-03-08
Classification: G09G

Abstract:
1. A driving circuit of an electro-optical device that has a plurality of scan lines, a plurality of data lines divided into groups each having m (where m is an integer equal to or greater than two) data lines, and pixels, which are provided in correspondence with intersections of the plurality of scan lines and the plurality of data lines, having gray scale levels in accordance with voltage values of the plurality of data lines at a time when the plurality of scan lines are individually selected and drives the plurality of data lines when one of the plurality of scan lines is selected, the driving circuit comprising: first transistors, which are provided in the plurality of data lines, each having one end commonly connected together in each group and the other terminal connected to the data line; second transistors, which are provided in the plurality of data lines, each having one end connected to the data line and the other end commonly connected together in each group; a control circuit that sequentially selects m data lines belonging to each group in a predetermined order at a time when the one of the plurality of scan lines is selected and makes one and the other terminals of the first transistor and the second transistor corresponding to the selected data line be in a mutual conduction state, respectively; a data signal output circuit that outputs data signals having voltage values in accordance with gray scale levels of pixels corresponding to intersections of the one scan line and the selected data line in each group to each group; and operational amplifiers, which are provided in correspondence with the each group, each setting a high voltage value to a voltage supplied to the one terminal of the first transistor in a case where the voltage of the one terminal of the second transistor in the conduction state is lower than a voltage of the data signal output from the data signal output circuit and setting a low voltage value to a voltage supplied to the one terminal of the first transistor in a case where the voltage of the one terminal of the second transistor in the conduction state is lower than the voltage of the data signal output from the data signal output circuit, wherein the data signals output from the data signal output circuit are supplied to the non-inverting input terminals of the operational amplifier circuits, the output terminals of the operational amplifier circuits are connected to the commonly connected portions of the one terminals of the first transistors, a resistor and a first switch are provided for each operational amplifier circuit, the resistors are interposed between the output terminals of the operational amplifier circuits and the inverting input terminals of the operational amplifier circuits, and the first switches, between the commonly connected portions of the other terminals of the second transistors and the inverting input terminals of the operational amplifier circuits, are turned off during a former period in a period during which one data line in each group is selected and are turned on during a latter period in the period during which one data line in each group is selected.