DISPLAY DEVICE AND METHOD OF DRIVING THE SAME

• US 20090207113A1
• Filed: 10/01/2008
• Published: 08/20/2009
• Est. Priority Date: 02/20/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: CHO, Jung-Hwan, LEE, Jun-Pyo
• Granted Patent: US 8,797,244 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/062 Waveforms for resetting a plurality of scan lines at a time
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display device includes: first and second pixels:, first and second gate lines which transfer first and second gate-on voltages, respectively, to both the first and second pixels in a first frame and a second frame, respectively; and a data line which transfers a first data voltage to both the first and second pixels in the first and second frames and transfers a second data voltage to both the first and second pixels in the second frame. The first pixel stores the first data voltage as a first stored data voltage in response to the first gate-on voltage and discharges the first stored data voltage in response to the second gate-on voltage. The second pixel stores the second data voltage as a second stored data voltage in response to the second gate-on voltage and discharges the second stored data voltage in response to the first gate-on voltage.

Claims

1. A display device comprising:

a first pixel;

a second pixel adjacent to the first pixel;

a first gate line which transfers a first gate-on voltage to the first pixel and the second pixel in a first frame;

a second gate line which transfers a second gate-on voltage to the first pixel and the second pixel in a second frame chronologically subsequent and adjacent to the first frame; and

a data line which transfers a first data voltage to the first pixel and the second pixel in the first frame and a second data voltage to the first pixel and the second pixel the second frame, wherein

the first pixel stores the first data voltage as a first stored data voltage in response to the first gate-on voltage and discharges the first stored data voltage in response to the second gate-on voltage, and

the second pixel stores the second data voltage as a second stored data voltage in response to the second gate-on voltage and discharges the second stored data voltage in response to the first gate-on voltage.

2. The display device of claim 1, further comprising:

a plurality of the first gate lines;

a plurality of the second gate lines; and

a display panel on which the plurality of first gate lines and the plurality of second gate lines are disposed, wherein first gate lines of the plurality of first gate lines and second gate lines of the plurality of second gate lines are disposed on the display panel in alternating positions.

3. The display device of claim 2, further comprising:

a plurality of the first pixels disposed on the display substrate; and

a plurality of the second pixels disposed on the display substrate, wherein

first pixels of the plurality of first pixels and second pixels of the plurality of second pixels are arranged in a matrix pattern, and

the first pixels and the second pixels are arranged alternately in both a row direction and in a column direction on the display substrate.

4. The display device of claim 2, further comprising:

a plurality of the first pixels disposed on the display substrate; and

a plurality of the second pixels disposed on the display substrate, wherein first pixels of the plurality of first pixels and second pixels of the plurality of second pixels are arranged alternately in a column direction.

5. The display device of claim 1, wherein one of the first pixel and the second pixel comprises:

a first switching element which transfers one of the first data voltage and the second data voltage in response to one of the first gate-on voltage and the second gate-on voltage;

a capacitor which stores the one of the first data voltage and the second data voltage transferred from the first switching element; and

a second switching element which discharges the one of the first data voltage and the second data voltage stored in the capacitor in response to one of the second gate-on voltage and the first gate-on voltage.

6. The display device of claim 5, wherein the capacitor comprises:

a pixel electrode which receives the one of the first data voltage and the second data voltage from the first switching element;

a common electrode which receives a common voltage; and

a liquid crystal layer formed between the pixel electrode and the common electrode.

7. The display device of claim 6, wherein the second switching element comprises a first terminal connected to the pixel electrode and a second terminal which receives the common voltage.

8. The display device of claim 6, wherein the second switching element comprises a first terminal connected to the pixel electrode and a second terminal connected to the common electrode.

9. The display device of claim 6, wherein

the one of the first pixel and the second pixel further comprises a signal line, the signal line and the pixel electrode forming the capacitor, and

the second switching element comprises a first terminal connected to the pixel electrode and a second terminal connected to the signal line.

10. The display device of claim 1, wherein the first frame and the second frame are alternately repeated.

11. A display device comprising:

a first pixel and a second pixel;

a first gate line which transfers a first gate-on voltage to at least one of the first pixel and the second pixel in a first frame;

a second gate line which transfers a second gate-on voltage to the at least one of the first pixel and the second pixel in a second frame chronologically subsequent and adjacent to the first frame; and

a first data line which transfers a first data voltage to the at least one of the first pixel and the second pixel in the first frame;

a second data line which transfers a second data voltage to the at least one of the first pixel and the second pixel in the second frame, wherein

the first pixel represents a gray voltage level corresponding to the first data voltage in response to the second gate-on voltage and represents a black voltage level in response to the first gate-on voltage, and

the second pixel which represents a gray voltage level corresponding to the second data voltage in response to the first gate-on voltage and represents a black voltage level in response to the second gate-on voltage.

12. The display device of claim 11, wherein:

the first pixel comprises;

a first switching element including a control terminal connected to the second gate line, a first terminal connected to the first data line and a second terminal;

a first pixel electrode connected to the second terminal of the first switching element;

a first common electrode to which a common voltage is applied; and

a second switching element including a control terminal connected to the first gate line, a second terminal connected to the pixel electrode, and a second terminal which receives the common voltage, and

the second pixel comprises;

a third switching element including a control terminal connected to the first gate line, a first terminal connected to the second data line and a second terminal;

a second pixel electrode connected to the second terminal of the third switching element;

a second common electrode to which the common voltage is applied; and

a fourth switching element including a control terminal connected to the second gate line, a second terminal connected to the second pixel electrode and a second terminal which receives the common voltage.

13. The display device of claim 12, wherein the second terminal of the second switching element is connected to the first common electrode, and

the second terminal of the fourth switching element is connected to the second common electrode.

14. The display device of claim 12, wherein

the first pixel further comprises a first signal line, the first signal line and the first pixel electrode forming a storage capacitor,

the second terminal of the second switching element is connected to the signal line;

the second pixel further comprises a second signal line, the second signal line and the second pixel electrode forming a storage capacitor, and

the second terminal of the fourth switching element is connected to the second signal line.

15. The display device of claim 11, further comprising:

a third pixel and a fourth pixel; and

a third gate line which transfers a third gate-on voltage to at least one of the third pixel and the fourth pixel in the first frame, wherein

the third pixel represents a gray voltage level corresponding to the first data voltage in response to the third gate-on voltage and represents a black voltage level in response to the second gate-on voltage; and

the fourth pixel represents a gray voltage level corresponding to the second data voltage in response to the second gate-on voltage and represents a black voltage level in response to the third gate-on voltage.

16. The display device of claim 15, wherein the second gate line is formed between the first gate line and third gate line.

17. The display device of claim 11, wherein the first frame and the second frame are alternately repeated.

18. A method of driving a display device comprising a first pixel, a second pixel, a third pixel and a fourth pixel arranged in a matrix form, the method comprising:

outputting a first gate-on voltage to the first pixel, the second pixel, the third pixel and the fourth pixel in a first frame;

storing data in the second pixel and the third pixel in response to the first gate-on voltage;

discharging data stored in the first pixel and the fourth pixel in response to the first gate-on voltage;

displaying an image corresponding to data stored in the second pixels and the third pixel;

outputting a second gate-on voltage to the first pixel, the second pixel, the third pixel and the fourth pixel in a second frame chronologically subsequent and adjacent to the first frame;

storing data in the first pixel and the fourth pixel in response to the second gate-on voltage;

discharging data stored in the second pixel and the third pixel in response to the second gate-on voltage; and

displaying an image corresponding to data stored in the first pixel and the fourth pixel.

19. The method of claim 18, wherein the display device further comprises:

a plurality of the first pixels;

a plurality of the second pixels;

a plurality of the third pixels; and

a plurality of the fourth pixels, wherein

first pixels of the plurality of first pixel and third pixels of the plurality of third pixel are arranged in an alternating manner in a column direction, and

second pixels of the plurality of second pixel and fourth pixels of the plurality of fourth pixel are arranged in an alternating manner in a column direction.

20. The method of claim 19, wherein the first pixel and the second pixel are arranged in an alternating manner in a row direction, and

the third pixel and the fourth pixel are arranged in an alternating manner in a row direction.

21. The method of claim 18, wherein the first frame and the second frame are alternately repeated.