Patent ID: 7499009
Filing Date: 2009-03-03
Classification: G09G

Abstract:
1. An erasing device for a liquid crystal display image, provided in a liquid crystal display device having a liquid crystal display panel whose pixels are driven by active elements, for erasing a display image on said liquid crystal display panel when a power source of a main body of said liquid crystal display device is turned OFF, said erasing device comprising: a power source OFF detection circuit detecting a command to turn OFF the power source of the main body of said liquid crystal display device; panel power maintaining circuit supplying power to said liquid crystal display panel for a certain period after a command to turn OFF the power source of the main body of said liquid crystal display device is inputted; and an erasing circuit lighting up said liquid crystal display panel entirely on a saturation voltage of liquid crystal and subsequently shutting off said liquid crystal display panel entirely using the power supplied from said panel power maintaining circuit source when said power source OFF detection circuit detects a command to turn OFF the power source of the main body of said liquid crystal display device.