Patent ID: 8730227
Filing Date: 2014-05-20
Classification: G09G

Abstract:
1. A driving device for outputting data voltages to a plurality of data lines, comprising: a data driver configured to output the data voltages, a voltage selector including first and second output terminals and configured to receive a power-down mode signal, a first voltage, a second voltage having a lower voltage level than that of the first voltage, and a third voltage between the first voltage and the second voltage, and configured to output the first voltage and the second voltage at its first and second output terminals, respectively, where the power-down mode signal is in a logic high state, and configured to output the third voltage to both of the first and second output terminals when the power-down mode signal is in a logic low state, and a gray-scale voltage generator including first and second reference terminals respectively electrically connected to the first and second output terminals, and including a resistor string connected in series between the first reference terminal and the second reference terminal, wherein the gray-scale voltage generator is configured to generate a plurality of gray-scale voltages having different voltage levels by voltage-dividing the first and second voltages when the power-down mode signal is in the logic high state, and configured to output a plurality of gray-scale voltages having the same voltage level as the third voltage when the power-down mode signal is in the logic low state, wherein the gray-scale voltages output by the gray-scale voltage generator are output to the data driver, wherein the gray-scale voltage generator further includes a third reference terminal through which the third voltage is supplied to the gray-scale voltage generator regardless of the power-down mode signal, wherein the third voltage is a common voltage approximately equal to the mean value between the first power voltage and the second power voltage, and wherein the voltage selector comprises: a first selection circuit configured to select and output through the first output terminal the first voltage when the power-down mode signal is in the logic high state and the third voltage when the power-down mode signal is in the logic low state; and a second selection circuit configured to output through the second output terminal the second voltage when the power-down mode signal is in the logic high state and the third voltage when the power-down mode signal is in the logic low state.