Patent ID: 9013382
Filing Date: 2015-04-21
Classification: G09G

Abstract:
1. A liquid crystal display (LCD) device comprising: a liquid crystal panel configured to display an image in response to an external power signal; a power switch configured to supply the external power signal to a common voltage generating unit, the common voltage generating unit generating and applying a common voltage to the liquid crystal panel; and a control circuit coupled to the liquid crystal panel and comprising wherein the control circuit couples the common voltage to the liquid crystal panel when the power switch is in the ON state and the external power signal is supplied to the common voltage generating unit and the control circuit, and wherein the delayed external power signal provides power to the common voltage switch to couple the ground voltage to the liquid crystal panel when the power switch is in the OFF state and no external power signal is supplied to the common voltage generating unit and the control circuit such that a residual common voltage of the liquid crystal panel is discharged upon termination of the external power signal, wherein an output terminal of the common voltage generating unit is directly connected to a common electrode of the liquid crystal panel when the power switch is in the ON state, wherein a ground voltage terminal is directly connected to a common electrode of the liquid crystal panel when the power switch is in the OFF state, wherein the external power signal is provided from a node between the power switch and the common voltage generating unit to the control circuit.