Driving device and display device including the same

1. A driving device, comprising:

a signal controller which receives an input image signal and an input control signal, and outputs an image data and a data control signal;

a reference voltage generator which generates a first reference voltage and a second reference voltage; and

a data driver which receives the image data and the data control signal from the signal controller and outputs a data voltage,

wherein

the data control signal includes a first color gamma control signal, a second color gamma control signal, and a third color gamma control signal, and

the data driver includes

a reference gamma voltage generator which receives the first reference voltage and the second reference voltage from the reference voltage generator, receives the first color, second color, and third color gamma control signals from the signal controller, and generates a reference gamma voltage according to color information of the image data.

2. The driving device of claim 1 , wherein:

the data driver further includes a gray voltage generating circuit which receives the reference gamma voltage from the reference gamma voltage generator and generates gray voltages for entire grays.

3. The driving device of claim 2 , wherein:

the reference gamma voltage generator includes:

a first resistor array in connection between the first reference voltage and the second reference voltage, and

a first decoder in connection to a node between resistors of the first resistor array, and

the first decoder receives the first color, second color, and third color gamma control signals and outputs the reference gamma voltage.

4. The driving device of claim 3 , wherein:

the gray voltage generating circuit includes a second resistor array in connection between the first reference voltage and the second reference voltage.

5. The driving device of claim 4 , wherein:

the data driver further includes a digital-to-analog converter which receives the gray voltages from the gray voltage generating circuit, selects a gray voltage corresponding to the image data and outputs the selected gray voltage as the data voltage.

6. The driving device of claim 5 , wherein:

the data control signal further includes a polarity control signal which controls a polarity of the data voltage,

the gray voltages include a negative-polarity gray voltage and a positive-polarity gray voltage, and

the digital-to-analog converter selects one of the negative-polarity gray voltage and the positive-polarity gray voltage according to the polarity control signal.

7. The driving device of claim 6 , wherein:

the data control signal further includes a data information signal including color information of an image.

8. The driving device of claim 1 , wherein:

the reference gamma voltage generator of the data driver includes:

a first resistor array in connection between the first reference voltage and the second reference voltage, and

a first decoder in connection to a node between resistors of the

first resistor array, and

the first decoder receives the first color, second color, and third color gamma control signals to output the reference gamma voltage.

9. The driving device of claim 1 , wherein:

the data driver further includes a digital-to-analog converter which selects a gray voltage corresponding to the image data and outputs the selected gray voltage as the data voltage.

10. The driving device of claim 9 , wherein:

the data control signal further includes a polarity control signal which controls a polarity of the data voltage,

the gray voltage include a negative-polarity gray voltage and a positive-polarity gray voltage, and

the digital-to-analog converter selects one of the negative-polarity gray voltage and the positive-polarity gray voltage according to the polarity control signal and outputs the selected polarity gray voltage as the data voltage.

11. A display device, comprising:

a display panel including a plurality of pixels;

a signal controller which receives an input image signal and an input control signal, and outputs an image data and a data control signal;

a reference voltage generator which generates a first reference voltage and a second reference voltage; and

a data driver which receives the image data and the data control signal from the signal controller, and outputs a data voltage to the display panel,

wherein

the data control signal includes a first color gamma control signal, a second color gamma control signal, and a third color gamma control signal and

the data driver includes

a reference gamma voltage generator which receives the first reference voltage and the second reference voltage from the reference voltage generator, receives the first color, second color, and third color gamma control signals from the signal controller, and generates a reference gamma voltage according to color information of the image data.

12. The display device of claim 11 , wherein:

the data driver further includes a gray voltage generating circuit which receives the reference gamma voltage from the reference gamma voltage generator and generates gray voltages for entire grays.

13. The display device of claim 12 , wherein:

the reference gamma voltage generator includes:

a first resistor array in connection between the first reference voltage and the second reference voltage, and

a first decoder in connection to a node between resistors of the first resistor array, and

the first decoder receives the first color, second color, and third color gamma control signals and outputs the reference gamma voltage.

14. The display device of claim 13 , wherein:

the gray voltage generating circuit includes a second resistor array in connection between the first reference voltage and the second reference voltage.

15. The display device of claim 14 , wherein:

the data driver further includes a digital-to-analog converter which receives the gray voltages from the gray voltage generating circuit, selects a gray voltage corresponding to the image data and outputs the selected gray voltage as the data voltage.

16. The display device of claim 15 , wherein:

the data control signal further includes a polarity control signal which controls a polarity of the data voltage,

the gray voltages include a negative-polarity gray voltage and a positive-polarity gray voltage, and

the digital-to-analog converter selects one of the negative-polarity gray voltage and the positive-polarity gray voltage according to the polarity control signal.

17. The display device of claim 16 , wherein:

the data control signal further includes a data information signal including color information of an image.

18. The display device of claim 11 , wherein:

the reference gamma voltage generator of the data driver includes:

a first resistor array in connection between the first reference voltage and the second reference voltage, and

a first decoder in connection to a node between resistors of the first resistor array, and

the first decoder receives the first color, second color, and third color gamma control signals and outputs the reference gamma voltage.

19. The display device of claim 11 , wherein:

the data driver further includes a digital-to-analog converter which selects a gray voltage corresponding to the image data and outputs the selected gray voltage as the data voltage.

20. The display device of claim 19 , wherein:

the data control signal further includes a polarity control signal which controls a polarity of the data voltage,

the gray voltage include a negative-polarity gray voltage and a positive-polarity gray voltage, and

the digital-to-analog converter selects one of the negative-polarity gray voltage and the positive-polarity gray voltage according to the polarity control signal and outputs the selected gray voltage as the data voltage.