Display device and driving method thereof

A method of driving a display device, comprising:

• generating a first gamma reference voltage and a second gamma reference voltage by dividing a high source voltage and generating a third gamma reference voltage and a fourth gamma reference voltage by dividing a low source voltage, wherein generating the first and second gamma reference voltages is irrelevant to the low source voltage, and generating the third and fourth gamma reference voltages is irrelevant to the high source voltage, wherein a gamma reference voltage generator generating the first to fourth gamma reference voltages comprises first and second gamma reference voltage dividers connected to the high source voltage in parallel and third and fourth reference voltage dividers connected to the low source voltage in parallel, and wherein the first to fourth gamma reference voltage dividers generate the first to fourth gamma reference voltages, respectively;
• exclusively selecting one of a plurality of gray level voltage dividers that are operative to generate a plurality of gray level voltages and respectively supplying both end terminals of the selected one of the plurality of gray level voltage dividers with the first gamma reference voltage and the second gamma reference voltage or the third gamma reference voltage and the fourth gamma reference voltage, wherein each of the plurality of gray level voltages is generated using the first gamma reference voltage and the second gamma reference voltage or the third gamma reference voltage and the fourth gamma reference voltage;
• generating a data voltage, wherein the data voltage is one of the selected gray level voltages corresponding to a gray level of a data signal;
• and
• supplying the data voltage to a display panel.

A data voltage generating circuit comprising:

• a select controller operative to generate a plurality of select signals;
• a selector coupled with the select controller operative to receive the select signal;
• a gamma reference voltage generator coupled with the selector and operative to generate a plurality of gamma reference voltages that includes a first plurality of gamma reference voltages generated by dividing a high source voltage and a second plurality of gamma reference voltages generated by dividing a low source voltage, wherein generating the first plurality of gamma reference voltages is irrelevant to the low source voltage, and generating the second plurality of gamma reference voltages is irrelevant to the high source voltage, wherein the gamma reference voltage generator comprises a first plurality of gamma reference voltage dividers connected to the high source voltage in parallel and a second reference voltage dividers connected to the low source voltage in parallel, and wherein the first plurality of gamma reference voltage dividers generate the first plurality of gamma reference voltages and the second gamma reference voltage dividers generate the second plurality of gamma reference voltages;
• and,
• a gray level voltage generator coupled with the selector and including a plurality of gray level voltage dividers operative to generate a plurality of gray level voltages wherein the selector is configured to exclusively select and respectively supply both end terminals of selected one of the plurality of gray level voltage dividers with the first plurality of gamma reference voltages or the second plurality of gamma reference voltages based on the received select signal, wherein a data signal supplied to the data voltage generating circuit is converted into a data voltage which is one of the selected gray level voltages corresponding to a gray level of the data signal.