Patent ID: 9595232
Date: 2017-03-14
CPC Classifications: G09G

Claim:
1. An active matrix-type liquid crystal display device that shifts to an off-sequence mode in such a manner that a power supply of the liquid crystal display device itself is turned off when the liquid crystal display device displays an image in an on-sequence mode, the liquid crystal display device comprising: a display including a plurality of scanning lines, a plurality of signal lines which intersect the plurality of scanning lines, and pixel formation portions arranged in a matrix so as to individually correspond to intersections of the plurality of scanning lines and the plurality of signal lines, and having thin film transistors which turn to an on state or an off state in response to a level of scanning signals applied to the scanning lines corresponding to the pixel formation portions, and pixel capacitances which hold image signals representing an image to be displayed; a scanning line drive circuit that applies the scanning signals to the scanning lines, the scanning signals serving for selectively activating the plurality of scanning lines; a signal line drive circuit that applies the image signals to the signal lines; a display control circuit that individually outputs control signals necessary to generate the scanning signals and the image signals to the scanning line drive circuit and the signal line drive circuit; a common electrode drive circuit that is provided commonly to the plurality of pixel formation portions, and applies a common voltage to a common electrode serving as one-side electrodes of the pixel capacitances; and an off-sequence control circuit that outputs a signal to the display control circuit when the power supply of the liquid crystal display device is turned off, the signal being necessary for the liquid crystal display device to shift to the off-sequence mode, wherein the off-sequence control circuit: the first level of the scanning signal is a substantially constant level which is lower than a level necessary to turn the thin film transistor to the on state in the on-sequence mode and higher than the ground potential.