Organic light emitting diode display

• US 20070001937A1
• Filed: 06/29/2006
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Chun, Min Doo, Park, Kwon Shik, Yoon, Soo Young
• Granted Patent: US 7,714,817 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

An organic light emitting diode (OLED) display device for reducing the number of lines of an organic light emitting diode panel is provided. The OLED display device includes first and second data lines; a power voltage supply line supplied with a power supply voltage; a gate line crossing the first data line, the second data line and the power voltage supply line; first and second organic light emitting diodes commonly connected to the power voltage supply line; a first organic light emitting diode driving circuit for driving the first organic light emitting diode with a data voltage from the first data line in response to a scanning signal from the gate line; and a second organic light emitting diode driving circuit for driving the second organic light emitting diode with a data voltage from the second data line in response to the scanning signal from the gate line.

Claims

1. An organic light emitting diode display device, comprising:

first and second data lines;

a power voltage supply line supplied with a power supply voltage;

a gate line crossing the first data line, the second data line and the power voltage supply line;

first and second organic light emitting diodes commonly connected to the power voltage supply line;

a first organic light emitting diode driving circuit for driving the first organic light emitting diode with a data voltage from the first data line in response to a scanning signal from the gate line; and

a second organic light emitting diode driving circuit for driving the second organic light emitting diode with a data voltage from the second data line in response to the scanning signal from the gate line.

2. The organic light emitting diode display device according to claim 1, further comprising:

a gate driving circuit for supplying the scanning signal to the gate line; and

a data driving circuit for supplying the data voltage to each of the data lines.

3. The organic light emitting diode display device according to claim 1, wherein the first organic light emitting diode driving circuit includes:

a first transistor for supplying the data voltage from the first data line to a first node in response to the scanning signal from the gate line;

a second transistor for controlling an amount of current amount flowing through the first organic light emitting diode by a voltage at the first node; and

a first storage capacitor for charging the voltage at the first node.

4. The organic light emitting diode display device according to claim 3, wherein the second organic light emitting diode driving circuit includes:

a third transistor for supplying the data voltage from the second data line to a second node in response to the scanning signal from the gate line;

a fourth transistor for controlling an amount of current flowing through the second organic light emitting diode by a voltage at the second node; and

a second storage capacitor for charging the voltage at the second node.

5. The organic light emitting diode display device according to claim 2, wherein the gate driving circuit is formed on a substrate provided with the first and second data lines, the power voltage supply line, the gate line, the first and second organic light emitting diodes, and the first and second organic light emitting diode driving circuits.

6. The organic light emitting diode display device according to claim 1, wherein two horizontally adjacent pixels are provided between the first and second data lines, wherein a first one of the two pixels includes the first organic light emitting diode and the first organic light emitting diode driving circuit, and a second one of the two pixels includes the second organic light emitting diode and the second organic light emitting diode driving circuit.

7. The organic light emitting diode display device according to claim 2, further comprising:

a reset line to apply a reset signal to the first and second organic light emitting diode driving circuits.

8. The organic light emitting diode display device according to claim 7, wherein the first organic light emitting diode driving circuit includes:

a first transistor for supplying the data voltage from the first data line to a first node in response to the scanning signal from the gate line;

a second transistor for controlling an amount of current flowing through the first organic light emitting diode by a voltage at the first node; and

a third transistor for discharging the first node in response to the reset signal from the reset line.

9. The organic light emitting diode display device according to claim 8, wherein the second organic light emitting diode driving circuit includes:

a fourth transistor for supplying the data voltage from the second data line to a second node in response to the scanning signal from the gate line;

a fifth transistor for controlling an amount of current flowing through the second organic light emitting diode by a voltage at the second node; and

a sixth transistor for discharging the second node in response to the reset signal from the reset line.

10. The organic light emitting diode display device according to claim 7, further comprising:

a reset driving circuit for generating the reset signal by more than ½

frame interval later in comparison to the scanning signal.

11. The organic light emitting diode display device according to claim 10, wherein the gate driving circuit and the reset driving circuit are formed on a substrate provided with the first and second data lines, the gate line, the power voltage supply line, the reset line, the first and second organic light emitting diodes, and the first and second organic light emitting diode driving circuits.

12. An organic light emitting diode display device, comprising:

m data lines, wherein m is an integer;

n gate lines crossing the data lines, wherein n is an integer;

a plurality of power voltage supply lines supplied with a power supply voltage and arranged in parallel to the data lines between the data lines;

a plurality of reset lines provided between the gate lines; and

first, second, third and fourth organic light emitting diodes commonly connected to a same one of the power voltage supply lines,

wherein two of the first through fourth organic light emitting diodes are horizontally adjacent to each other.

13. The organic light emitting diode display device according to claim 12, further comprising:

a first pixel including the first organic light emitting diode, and a first organic light emitting diode driving circuit for driving the first organic light emitting diode with a data voltage from one of the odd-numbered data lines in response to a scanning signal from one of the odd-numbered gate lines, the first organic light emitting diode driving circuit being initialized in response to a reset signal from one of the reset lines; and

a second pixel including the second organic light emitting diode, and a second organic light emitting diode driving circuit for driving the second organic light emitting diode with a data voltage from one of the even-numbered data lines in response to the scanning signal from the one of the odd-numbered gate lines, the second organic light emitting diode driving circuit being initialized in response to a reset signal from one of the reset lines.

14. The organic light emitting diode display device according to claim 13, further comprising:

a third pixel including the third organic light emitting diode, and a third organic light emitting diode driving circuit for driving the third organic light emitting diode with the data voltage from the one of the odd-numbered data lines in response to a scanning signal from one of the even-numbered gate lines, the third organic light emitting diode driving circuit being initialized in response to a reset signal from one of the reset lines; and

a fourth pixel including the fourth organic light emitting diode, and a fourth organic light emitting diode driving circuit for driving the fourth organic light emitting diode with the data voltage from the one of the even-numbered data lines in response to the scanning signal from the one of the even-numbered gate lines, the second organic light emitting diode driving circuit being initialized in response to a reset signal from one of the reset lines.

15. The organic light emitting diode display device according to claim 14, wherein the first to fourth pixels are simultaneously initialized by the same reset signal applied from one same reset line.

16. The organic light emitting diode display device according to claim 14, wherein the first organic light emitting diode driving circuit includes:

a first transistor for supplying the data voltage from the one of the odd-numbered data lines to a first node in response to the scanning signal from the one of the odd-numbered gate lines;

a second transistor for controlling an amount of current flowing through the first organic light emitting diode by a voltage at the first node; and

a third transistor for discharging the first node in response to the reset signal.

17. The organic light emitting diode display device according to claim 16, wherein the second organic light emitting diode driving circuit includes:

a fourth transistor for supplying the data voltage from the one of the even-numbered data lines to a second node in response to the scanning signal from the one of the odd-numbered gate lines;

a fifth transistor for controlling an amount of current flowing through the second organic light emitting diode by a voltage at the second node; and

a sixth transistor for discharging the second node in response to the reset signal.

18. The organic light emitting diode display device according to claim 17, wherein the third organic light emitting diode driving circuit includes:

a seventh transistor for supplying the data voltage from the one of the odd-numbered data lines to a third node in response to the scanning signal from the one of the even-numbered gate lines;

an eighth transistor for controlling an amount of current flowing through the third organic light emitting diode by a voltage at the third node; and

a ninth transistor for discharging the third node in response to the reset signal.

19. The organic light emitting diode display device according to claim 18, wherein the fourth organic light emitting diode driving circuit includes:

a tenth transistor for supplying the data voltage from the one of the even-numbered data lines to a fourth node in response to the scanning signal from the one of the even-numbered gate lines;

an eleventh transistor for controlling an amount of current flowing through the fourth organic light emitting diode by a voltage at the fourth node; and

a twelfth transistor for discharging the fourth node in response to the reset signal.

20. The organic light emitting diode display device according to claim 12, further comprising:

a gate driving circuit for sequentially supplying the scanning signal to the gate lines;

a data driving circuit for supplying a data voltage to each of the data lines; and

a reset driving circuit for supplying a reset signal to the reset lines.

21. The organic light emitting diode display device according to claim 20, wherein the gate driving circuit includes:

a shift register for sequentially generating the scanning signal in response to a clock signal generated in accordance with a predetermined clock frequency, the reset signal being generated at a frequency of 1/c×

the clock frequency (wherein c is an integer) to be supplied simultaneously to the c reset lines.

22. The organic light emitting diode display device according to claim 20, wherein the reset driving circuit sequentially applies the reset signal to the reset lines.

23. The organic light emitting diode display device according to claim 20, wherein the gate driving circuit and the reset driving circuit are formed on a substrate provided with the data lines, the gate lines, the power voltage supply lines, the reset lines, the organic light emitting diodes and the organic light emitting diode driving circuits.

24. The organic light emitting diode display device according to claim 12, wherein there are m/2 power voltage supply lines and n/2 reset lines.

25. An organic light emitting diode display device comprising:

first and second data lines adjacent to each other and respectively supplying first and second data signals;

first and second gate lines adjacent to each other and respectively supplying first and second scanning signals, the first and second gate lines crossing the first and second data lines; and

at least first and second pixels provided at an area formed between the first and second data lines and the first and second gate lines.

26. The organic light emitting diode display device according to claim 25, further comprising:

a single power voltage supply line disposed between the first and second data lines and supplying a voltage to light emitting diodes of the at least first and second pixels.

27. The organic light emitting diode display device according to claim 26, further comprising:

a single reset line disposed between the first and second gate lines and supplying a reset signal to the at least first and second pixels.

28. The organic light emitting diode display device according to claim 25, wherein the at least first and second pixels include the first pixel, the second pixel, a third pixel and a fourth pixel, the first and second pixels being horizontally adjacent to each other, the third and fourth pixels being horizontally adjacent to each other.

29. The organic light emitting diode display device according to claim 28, further comprising:

a single power voltage supply line disposed between the first and second data lines and supplying a voltage to light emitting diodes of the first, second, third and fourth pixels.

30. The organic light emitting diode display device according to claim 29, further comprising:

a single reset line disposed between the first and second gate lines and supplying a reset signal to the first, second, third and fourth pixels.

31. A method of forming an organic light emitting diode display device, the method comprising:

forming first and second data lines adjacent to each other on a substrate, the first and second data lines respectively supplying first and second data signals;

forming first and second gate lines adjacent to each other on the substrate, the first and second gate lines respectively supplying first and second scanning signals and crossing the first and second data lines; and

forming at least first and second pixels at an area formed between the first and second data lines and the first and second gate lines.

32. The method according to claim 31, further comprising:

forming a single power voltage supply line between the first and second data lines, the power voltage supply line supplying a voltage to light emitting diodes of the at least first and second pixels.

33. The method according to claim 32, further comprising:

forming a single reset line between the first and second gate lines, the reset line supplying a reset signal to the at least first and second pixels.

34. The method according to claim 31, wherein the at least first and second pixels include the first pixel, the second pixel, a third pixel and a fourth pixel, the first and second pixels being horizontally adjacent to each other, the third and fourth pixels being horizontally adjacent to each other.

35. The method according to claim 34, further comprising:

forming a single power voltage supply line between the first and second data lines, the power voltage supply line supplying a voltage to light emitting diodes of the first, second, third and fourth pixels.

36. The method according to claim 35, further comprising:

forming a single reset line between the first and second gate lines, the reset line supplying a reset signal to the first, second, third and fourth pixels.