Patent ID: 9311881
Filing Date: 2016-04-12
CPC Classification: G09G

Claim Text:
1. A liquid crystal display device comprising: a substrate that constitutes a display panel; a plurality of video signal lines which transmit video signals; a plurality of scanning signal lines which intersect the plurality of video signal lines; a plurality of pixel formation portions arranged in a matrix so as to correspond to the plurality of video signal lines and the plurality of scanning signal lines; a scanning signal line drive circuit that includes a shift register made of a plurality of bistable circuits which are provided so as to correspond to the plurality of scanning signal lines and sequentially output pulses based on a clock signal, and that selectively drives the plurality of scanning signal lines based on the pulses outputted from the shift register; a power supply circuit that generates, based on a power supply given from an outside, a scanning signal line selection potential as a potential for turning the scanning signal lines to a selected state, and a scanning signal line non-selection potential as a potential for turning the scanning signal lines to a non-selected state; a drive control unit that generates the clock signal, a clear signal for initializing states of the plurality of bistable circuits, and a reference potential as a potential serving as a reference of operations of the plurality of bistable circuits, and controls an operation of the scanning signal line drive circuit; and a power supply state detection unit that gives a predetermined power supply OFF signal to the drive control unit upon detecting an OFF state of the power supply, wherein the plurality of video signal lines, the plurality of scanning signal lines, the plurality of pixel formation portions, and the scanning signal line drive circuit are formed on the substrate, each of the bistable circuits includes: the power supply circuit generates, as the scanning signal line selection potential, a first scanning signal line selection potential and a second scanning signal line selection potential, which are different from each other in change state of a potential level when the power supply is turned to an OFF state, the drive control unit: at a point of time when the second discharge processing is started, the first scanning signal line selection potential is equalized to a ground potential, and the second scanning signal line selection potential is maintained at a potential level at which the switching elements included in each of the bistable circuits are turned to an ON state.