Driving device, display device, and method of driving the same

A driving device for a display device, the display device including a plurality of pixels connected to data lines, the driving device comprising:na gray voltage generator which generates a plurality of gray voltages;a voltage selector which selects an output voltage from the plurality of gray voltages;a voltage level converter which converts a level of the output voltage selected by the voltage selector and applies the output voltage with a converted level to the data lines;a first switching unit connecting the voltage level converter to the voltage selector and the data lines; anda second switching unit directly connecting the voltage selector and the data lines,wherein operating times of the first switching unit and the second switching unit are different from each other,wherein the first switching unit comprises a first switching transistor connecting the voltage level converter to the voltage selector, a second switching transistor connecting the voltage level converter to the data lines, and a third switching transistor connecting the voltage level converter to a first voltage terminal having a first voltage andwherein a control terminal of the first switching transistor, a control terminal of the second switching transistor, and a control terminal of the third switching transistor are electrically connected to each other by a direct connection; andthe connection of the control terminal of the first switching transistor, the control terminal of the second switching transistor, and the control terminal of the third switching transistor is not connected to a capacitor.

A display device comprising:na plurality of pixels connected to data lines;a gray voltage generator which generates a plurality of gray voltages;a gate driver which applies a gate signal to gate lines; anda data driver which processes a voltage selected from the plurality of gray voltages, generates an output voltage, and applies the output voltage to the data lines,wherein the data driver has an output buffer which charges and discharges the data lines according to the output voltage,wherein the output buffer comprises a second switching transistor connected to a first voltage terminal having a first voltage, a third switching transistor which receives the voltage selected from the plurality of gray voltages, and a fourth switching transistor which outputs the output voltage, andwherein a control terminal of the second switching transistor, a control terminal of the third switching transistor, and a control terminal of the fourth switching transistor are electrically connected to each other by a direct connection; andthe connection of the control terminal of the second switching transistor, the control terminal of the third switching transistor, and the control terminal of the fourth switching transistor is not connected to a capacitor.

A method of driving a display device, the method comprising:nconverting a digital image signal into an analog data voltage;connecting a terminal of the analog data voltage to data lines of the display device;generating a conversion voltage based on the analog data voltage; andconnecting a terminal of the conversion voltage to the data lines,wherein the analog data voltage is received through a first switching transistor and the conversion voltage is outputted through a second switching transistor, andwherein a control terminal of the first switching transistor, a control terminal of the second switching transistor, and a control terminal of a third switching transistor are electrically connected to each other by a direct connection, the third switching transistor is connected to a first voltage terminal having a first voltage, and a fourth switching transistor directly connects the analog data voltage and the data lines; andthe connection of the control terminal of the first switching transistor, the control terminal of the second switching transistor, and the control terminal of the third switching transistor is not connected to a capacitor.