Patent ID: 8207951

Claim:
A matrix array drive device comprising: a horizontal scanning circuit controlling signal electrodes in a matrix array such that data signals corresponding to N rows (where N is an integer of two or greater) of the matrix array are latched one row after another every horizontal scanning period of a predetermined length and a latch output for each row continues to be produced for every horizontal scanning period of N rows; and a vertical scanning circuit controlling scanning electrodes in the matrix array such that the matrix array is simultaneously driven N rows at a time, and rows to be driven are shifted one row each horizontal scanning period, wherein the vertical scanning circuit includes a loop shift register that is operated by receiving a horizontal synchronization signal and a vertical synchronization signal, and is initialized, every vertical scanning period of a predetermined length, to a state in which dummy scanning electrodes of N rows disposed above a group of scanning electrodes are driven simultaneously, wherein the loop shift register comprises a plurality of flip-flops connected in series and in multiple stages, wherein output terminals of the flip-flops of N stages from a front are connected to the dummy scanning electrodes of N rows disposed above the group of scanning electrodes, and output terminals of the remaining flip-flops are connected to the group of scanning electrodes and dummy scanning electrodes disposed below the group of scanning electrodes, wherein an operation of the plurality of flip-flops is individually triggered by the horizontal synchronization signal input to a clock terminal, and wherein the flip-flops of N stages from the front are triggered by the vertical synchronization signal input to a set terminal such that an output logic thereof is initialized to an active state, and the remaining flip-flops are triggered by the vertical synchronization signal input to a reset terminal such that an output logic thereof is initialized to an inactive state.