Light emitting display device including data voltage output circuits one of which pre-charges a reference line and driving method thereof

1. A light emitting display device comprising:

a display panel configured to display an image; and

a data driver comprising a panel driving circuit and a panel sensing circuit, the panel driving circuit including a plurality of data voltage output circuits configured to drive the display panel, and the panel sensing circuit configured to sense the display panel through a reference line,

wherein a first data voltage output circuit from the plurality of data voltage output circuits outputs a pre-charge voltage to the reference line to pre-charge,

wherein the data driver further comprises at least one switch configured to transfer a voltage output from a second data voltage output circuit from the plurality of data voltage output circuits to a data channel corresponding to a first data voltage output circuit from the plurality of data voltage output circuits while the first data voltage output circuit outputs the pre-charge voltage to the reference line, and

wherein the pre-charge voltage charged on the reference line of the display panel is applied to a sensing node of a sub-pixel to be sensed.

2. The light emitting display device according to claim 1 , wherein each of the plurality of data voltage output circuits is connected to a corresponding one sub-pixel from a plurality of sub-pixels, a corresponding one data line from a plurality of data lines, and a corresponding one data channel from a plurality of data channels of the data driver, the corresponding one data channel connecting each data voltage output circuit to the corresponding data line,

wherein the plurality of sub-pixels corresponding to the plurality of data voltage output circuits are all connected to the reference line.

3. The light emitting display device according to claim 2 , wherein, when a voltage output from a first data voltage output circuit among the plurality of data voltage output circuits is used as the pre-charge voltage, a voltage output from a second data voltage output circuit among the plurality of data voltage output circuits is output through a data channel corresponding to the first data voltage output circuit.

4. The light emitting display device according to claim 3 , wherein the second data voltage output circuit is adjacent to or spaced apart from the first data voltage output circuit.

5. The light emitting display device according to claim 3 , wherein the voltage output from the second data voltage output circuit is also output through a data channel corresponding to the second data voltage output circuit.

6. The light emitting display device according to claim 3 , wherein a third data voltage output circuit among the plurality of data voltage output circuits outputs a sensing voltage through a data channel corresponding to the third data voltage output circuit.

7. The light emitting display device according to claim 2 , wherein the data driver further comprises a plurality of switches each configured to transfer a voltage output from one of the plurality of data voltage output circuits to a corresponding data channel or transfer a voltage output from another one of the plurality of data voltage output circuits to a sensing channel connected to the reference line during sensing of the display panel.

8. The light emitting display device according to claim 2 , wherein at least two data channels among a plurality of data channels corresponding to the plurality of data voltage output circuits are connected to each other via one switch, and

at least one of at least two data voltage output circuits corresponding to the at least two data channels is connected to the reference line via one switch.

9. The light emitting display device according to claim 2 , wherein at least two pairs of data channels among a plurality of data channels corresponding to the plurality of data voltage output circuits are connected to each other via one switch, and

at least one data voltage output circuit of at least two pairs of data voltage output circuits corresponding to the at least two pairs of data channels is connected to the reference line via one switch.

10. The light emitting display device according to claim 1 , wherein each of the plurality of data voltage output circuits outputs a data voltage to a corresponding one data line from a plurality of data lines when the display panel is driven, and outputs at least one of a sensing voltage, a black data voltage, or a pre-charge voltage when the display panel is sensed.

11. The light emitting display device according to claim 10 , wherein the sensing voltage and the black data voltage are output to a data line, and the pre-charge voltage is output to the reference line.

12. The light emitting display device according to claim 10 , wherein the data driver further comprises:

a voltage output switch configured to perform a switching operation to output the data voltage, the sensing voltage, or the black data voltage through a data channel corresponding to the voltage output switch,

a voltage sharing switch configured to perform a switching operation to transfer the black data voltage to another data channel different from the data channel corresponding to a data voltage output circuit that outputted the black data voltage, and

a pre-charging switch configured to perform a switching operation to output the pre-charge voltage through a sensing channel connected to the reference line.

13. The light emitting display device according to claim 12 , wherein:

the voltage output switch includes a first electrode connected to an output terminal of a corresponding one of the plurality of data voltage output circuits and a second electrode connected to the data channel corresponding to the corresponding data voltage output circuit, the voltage output switch operating in response to a first signal applied to a control electrode of the voltage output switch,

the voltage sharing switch includes a first electrode connected to the data channel corresponding to the data voltage output circuit outputting the black data voltage and a second electrode connected to the other data channel, the voltage sharing switch operating in response to a second signal applied to a control electrode of the voltage sharing switch, and

the pre-charging switch includes a first electrode connected to a corresponding data voltage output circuit and a second electrode connected to the sensing channel, the pre-charging switch operating in response to a third signal applied to a control electrode of the pre-charging switch.

14. The light emitting display device according to claim 10 , wherein the pre-charge voltage is varied based on at least one of a driving time of the device, stress information, a pre-charge voltage value, or a threshold voltage value.

15. The light emitting display device according to claim 1 , wherein the data driver further comprises at least one switch configured to transfer a voltage output from one of the plurality of data voltage output circuits to a sensing channel connected to the reference line.

16. A method of driving the light emitting display device of claim 1 , the light emitting display device comprising the display panel configured to display the image, and the data driver having the panel driving circuit configured to drive the display panel, and the panel sensing circuit configured to sense the display panel, the method comprising:

applying a sensing voltage to a data line of a sub-pixel of a plurality of subpixels to be sensed and a black data voltage to a data line of a sub-pixel of the plurality of subpixels that is not to be sensed to sense the display panel; and

applying a pre-charge voltage to a reference line of the sub-pixel to be sensed,

wherein the pre-charge voltage is a voltage output from one of a plurality of data voltage output circuits included in the panel driving circuit.

17. The method according to claim 16 , wherein the pre-charge voltage is varied based on at least one of a driving time of the device, stress information, a pre-charge voltage value, or a threshold voltage value.

18. A light emitting display device comprising:

a display panel configured to display an image, the display panel including a plurality of sub-pixels, a reference line connected to the plurality of sub-pixels, and a plurality of data lines, each of the plurality of data lines connected to a corresponding one of the plurality of sub-pixels; and

a data driver comprising a plurality of data voltage output circuits configured to drive the display panel via the plurality of data lines and a panel sensing circuit configured to sense the display panel through the reference line, each of the plurality of data voltage output circuits connected to a corresponding one of the data lines,

wherein a first data voltage output circuit from the plurality of data voltage output circuits is configured to output a sensing voltage to a first data line connected to a first sub-pixel from the plurality of sub-pixels that corresponds to the first data voltage output circuit, and a second data voltage output circuit from the plurality of data voltage output circuits is configured to output a pre-charge voltage to the reference line that is applied to a sensing node of the first sub-pixel while the sensing voltage is applied to the first sub-pixel.