KR20150083229A - Pixel and organic light emitting display device using the same - Google Patents

Abstract

The present invention relates to a pixel for enhancing display quality. The pixel according to an embodiment of the present invention comprises: an organic light emitting diode having a cathode electrode connected to a second power source; a first transistor connected between a voltage source and an anode electrode of the organic light emitting diode and getting turned on when a scan signal is supplied to an i+1(i is a natural number)^th scan line; a second transistor for controlling a current amount supplied from a first power source, connected via a first node, to the organic light emitting diode in response to voltage applied to a second node; a third transistor connected between a second electrode of the second transistor and the second node and getting turned on when a scan signal is supplied to a i^th scan line; and a fourth transistor connected between the second electrode of the second transistor and the second node and getting turned on when a scan signal is supplied to a i-1^th scan line.

Description

TECHNICAL FIELD [0001] The present invention relates to a pixel and an organic light emitting display using the same,

The present invention relates to a pixel and an organic light emitting display using the same, and more particularly, to a pixel and an organic light emitting display using the same to improve display quality.

As the information technology is developed, the importance of the display device, which is a connection medium between the user and the information, is emphasized. In accordance with this, a flat panel display (LCD) such as a liquid crystal display (LCD), an organic light emitting display (OLED), and a plasma display panel (PDP) FPD) is increasing.

Among the flat panel display devices, the organic light emitting display device displays an image using an organic light emitting diode that generates light by recombination of electrons and holes, and has advantages of fast response speed and low power consumption .

An organic light emitting display includes a plurality of pixels arranged in a matrix at intersections of a plurality of data lines, a plurality of scanning lines, and a plurality of power lines. The pixels generally include an organic light emitting diode and a driving transistor for controlling the amount of current flowing to the organic light emitting diode. Such pixels generate light of a predetermined luminance while supplying a current from the driving transistor to the organic light emitting diode corresponding to the data signal.

On the other hand, due to an increase in the efficiency and resolution of the organic light emitting diode, the organic light emitting diode can be easily emitted even at a low current. In this case, there is an advantage that a high luminance image can be expressed while lowering power consumption.

However, when the organic light emitting diode is easily emitted even at a low current, there is a problem that the luminance of black increases. In other words, when black is expressed in a pixel, the organic light emitting diode is very light-emitting by the leakage current, and consequently the contrast ratio is lowered.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pixel capable of improving display quality and an organic light emitting display using the same.

A pixel according to an embodiment of the present invention includes an organic light emitting diode having a cathode electrode connected to a second power source; A first transistor connected between the voltage source and the anode electrode of the organic light emitting diode and turned on when a scan signal is supplied to the (i + 1) th scan line; A second transistor for controlling an amount of current supplied to the organic light emitting diode from a first power source connected via a first node corresponding to a voltage applied to the second node; A third transistor connected between a second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the ith scan line; And a fourth transistor connected between the second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the (i-1) th scan line.

A fifth transistor connected between the second node and the initialization power supply, the fifth transistor being turned on when a scan signal is supplied to the (i-1) th scan line; And a sixth transistor connected between the data line and the first node and turned on when a scan signal is supplied to the i-th scan line.

According to an embodiment, the initialization power source is set to a lower voltage than a data signal supplied to the data line.

According to an embodiment, the voltage source is the second power source or the initialization power source.

A seventh transistor connected between the first power source and the first node, the seventh transistor being turned off when the emission control signal is supplied to the emission control line and being turned on in other cases; An eighth transistor connected between the second electrode of the second transistor and the anode electrode of the organic light emitting diode and turned off when the emission control signal is supplied to the emission control line, .

According to an embodiment, the seventh transistor partially overlaps the turn-on period with the fourth transistor.

According to the embodiment, the seventh transistor does not overlap with the first transistor and the third transistor in the turn-on period.

An organic light emitting display according to an exemplary embodiment of the present invention includes a scan driver for supplying a scan signal to scan lines and a light emission control signal to emission control lines; A data driver for supplying a data signal to data lines; And pixels located in a region partitioned by the scan lines and the data lines; Each of the pixels located on the i-th (i is a natural number) horizontal line is connected to a cathode of the organic light emitting diode connected to the second power source; A first transistor connected between a voltage source and an anode electrode of the organic light emitting diode, the first transistor being turned on when a scan signal is supplied to the (i + 1) th scan line; A second transistor for controlling an amount of current supplied to the organic light emitting diode from a first power source connected via a first node corresponding to a voltage applied to the second node; A third transistor connected between a second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the ith scan line; And a fourth transistor connected between the second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the (i-1) th scan line.

A fifth transistor connected between the second node and the initialization power supply, the fifth transistor being turned on when a scan signal is supplied to the (i-1) th scan line; And a sixth transistor connected between the data line and the first node and turned on when a scan signal is supplied to the i-th scan line.

According to an embodiment, the initialization power source is set to a lower voltage than the data signal.

According to an embodiment, the voltage source is the second power source or the initialization power source.

A seventh transistor connected between the first power source and the first node and turned on when the emission control signal is supplied to the ith emission control line and turned on in the other case; An eighth light emitting control line connected between the second electrode of the second transistor and the anode electrode of the organic light emitting diode and turned off when the emission control signal is supplied to the i th emission control line, And further includes a transistor.

The scan driver may completely overlap the scan signals supplied to the i-th scan line and the (i + 1) -th scan line, the scan driver being overlapped with the scan signals supplied to the i- And supplies the light emission control signal as much as possible.

According to the pixel and the organic light emitting display using the same according to the embodiment of the present invention, after the data signal is supplied to the pixel, the voltage of the initialization power source is supplied to the anode electrode of the organic light emitting diode, prevent. Further, in the present invention, the anode electrode of the organic light emitting diode is lowered when the initializing power is supplied, and the voltage is raised during the light emitting period in which the current is supplied. In this case, the gate electrode voltage of the driving transistor is also lowered and raised by the parasitic capacitor, so that it can finally be set to a voltage substantially corresponding to the data signal. That is, according to the present invention, the voltage change of the gate electrode of the driving transistor due to the initialization power supplied to the anode electrode of the organic light emitting diode can be minimized, thereby displaying an image with a desired luminance.

In addition, in the present invention, the driving transistor is initialized to the on-bias state before the data signal is supplied to the pixel, so that the image of the desired luminance can be displayed irrespective of the previous data signal. In addition, a current path from the first power source to the initialization power source is formed during the period in which the driving transistor is set to the on-bias state, thereby preventing the organic light emitting diode from unnecessarily emitting light.

1 is a view illustrating an organic light emitting display according to an embodiment of the present invention.
2 is a diagram showing a pixel according to an embodiment of the present invention.
3 is a waveform diagram showing a driving method according to an embodiment of the present invention.
4 is a diagram showing the flow of current during the on-bias period.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4, which will be readily apparent to those skilled in the art.

1 is a view illustrating an organic light emitting display according to an embodiment of the present invention.

1, an organic light emitting display according to an exemplary embodiment of the present invention includes pixels 140 positioned in a region partitioned by scan lines S1 to Sn and data lines D1 to Dm A scan driver 110 for driving the scan lines S1 to Sn and the emission control lines E1 to En and a data driver 120 for driving the data lines D1 to Dm, And a timing controller 150 for controlling the scan driver 110 and the data driver 120.

The timing controller 150 generates a data driving control signal DCS and a scan driving control signal SCS in response to externally supplied synchronizing signals (not shown). The data driving control signal DCS generated by the timing control unit 150 is supplied to the data driver 120 and the scan driving control signal SCS is supplied to the scan driver 110. Then, the timing controller 150 supplies the data (Data) supplied from the outside to the data driver 120.

The scan driver 110 receives the scan driving control signal SCS from the timing controller 150. The scan driver 110 receiving the scan driving control signal SCS generates a scan signal and supplies the generated scan signal to the scan lines S1 to Sn. In addition, the scan driver 110 generates an emission control signal in response to the scan driving control signal SCS, and supplies the generated emission control signals to the emission control lines E1 to En. Here, the width of the light emission control signal is set to be equal to or wider than the width of the scan signal. For example, the emission control signal supplied to the i-th (i is a natural number) emission control line overlaps with the scan signal supplied to the (i-1) th scan line Si- can be supplied so as to completely overlap with the scanning signal supplied to the (i + 1) -th scan line (Si + 1).

In addition, the scan signal is set to a voltage (e.g., a low voltage) at which the transistors included in each of the pixels 140 can be turned on, and the emission control signal is generated when the transistor included in each of the pixels 140 is turned - a voltage to be turned off (e.g., a high voltage).

The data driver 120 receives the data driving control signal DCS from the timing controller 150. The data driver 120 receiving the data driving control signal DCS generates a data signal and supplies the generated data signal to the data lines D1 to Dm in synchronization with the scanning signal.

The pixel unit 130 includes pixels 140 positioned in a region partitioned by the scan lines S1 to Sn and the data lines D1 to Dm. The pixels 140 are supplied with a first power ELVDD from the outside and a second power ELVSS set to a voltage lower than the first power ELVDD.

Each of the pixels 140 includes a driving transistor (not shown) and an organic light emitting diode (OLED). The driving transistor controls the amount of current flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED in response to the data signal. The pixels 140 may include an on-bias applying period for improving a response characteristic of the driving transistor, a data signal storing period for storing a voltage corresponding to the data signal, A black luminance enhancement period, and a light emission period that emits light corresponding to the stored data signal. To this end, the pixels 140 positioned on the i-th horizontal line may be further connected to the i-1 th scan line Si-1 and the (i + 1) th scan line Si + 1.

2 is a diagram showing a pixel according to an embodiment of the present invention. In FIG. 2, for convenience of description, pixels connected to the m-th data line Dm are shown in the i-th horizontal line.

2, a pixel 140 according to an embodiment of the present invention includes an organic light emitting diode (OLED) and a pixel circuit 142 for controlling an amount of current supplied to the organic light emitting diode (OLED).

The organic light emitting diode OLED generates light having a predetermined luminance corresponding to the amount of current supplied from the pixel circuit 142.

The pixel circuit 142 controls the amount of current supplied to the organic light emitting diode OLED in response to the data signal. To this end, the pixel circuit 142 includes a storage capacitor Cst, a first transistor M1 to an eighth transistor M8.

The first transistor M1 is connected between the anode electrode of the organic light emitting diode OLED and the fixed voltage source. Here, the fixed voltage source is set to a lower voltage than the data signal, and may be set as the second power source ELVSS or the initialization power source Vint. Hereinafter, for convenience of explanation, it is assumed that the first transistor M1 is connected to the initialization power source Vint.

The first transistor M1 is turned on when a scan signal is supplied to the (i + 1) th scan line Si + 1 and supplies a voltage of the initialization power source Vint to the anode electrode of the organic light emitting diode OLED. When the initializing voltage Vint is supplied to the anode electrode of the organic light emitting diode OLED, the organic capacitor ColD formed in the organic light emitting diode OLED is discharged.

Here, when the organic capacitor Coled is discharged, the organic light emitting diode OLED can be prevented from emitting light by the leakage current supplied from the pixel circuit 142 in implementing the black luminance. In other words, the organic light emitting diode OLED is precharged by the leakage current supplied from the pixel circuit 142 during the implementation of the black luminance, and the organic light emitting diode OLED is set to the non-emission state during the precharge period.

Actually, since the second transistor M2 (driving transistor) included in the pixel circuit 142 is set to the turn-off state in the black luminance implementation, a small amount of leakage current is supplied to the organic light emitting diode OLED The organic light emitting diode OLED stably maintains the non-emission state. Since the second transistor M2 included in the pixel circuit 142 is set in the turn-on state during the gray scale implementation, a current larger than the leakage current is supplied to the organic light emitting diode OLED, The luminance corresponding to the gray level can be realized.

The first electrode of the second transistor M2 is connected to the first node N1 and the second electrode of the second transistor M2 is connected to the first electrode of the eighth transistor M8. The gate electrode of the second transistor M2 is connected to the second node N2. The second transistor M2 controls the amount of current flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED in response to the voltage charged in the storage capacitor Cst.

The first electrode of the third transistor M3 is connected to the second electrode of the second transistor M2, and the second electrode of the third transistor M3 is connected to the second node N2. The gate electrode of the third transistor M3 is connected to the ith scan line Si. The third transistor M3 is turned on when a scan signal is supplied to the ith scan line Si to electrically connect the second electrode of the second transistor M2 to the second node N2. That is, when the third transistor M3 is turned on, the second transistor M2 is connected in a diode form.

The first electrode of the fourth transistor M4 is connected to the second electrode of the second transistor M2, and the second electrode of the fourth transistor M4 is connected to the second node N2. The gate electrode of the fourth transistor M4 is connected to the (i-1) th scan line Si-1. The fourth transistor M4 is turned on when a scan signal is supplied to the i-1 scan line Si-1 to electrically connect the second electrode of the second transistor M2 and the second node N2. Respectively.

The first electrode of the fifth transistor M5 is connected to the second node N2, and the second electrode of the fifth transistor M5 is connected to the initialization power source Vint. The gate electrode of the fifth transistor M5 is connected to the (i-1) th scan line Si-1. The fifth transistor M5 is turned on when a scan signal is supplied to the (i-1) th scan line Si-1 and supplies the voltage of the initialization power source Vint to the second node N2.

The first electrode of the sixth transistor M6 is connected to the data line Dm, and the second electrode of the sixth transistor M6 is connected to the first node N1. The gate electrode of the sixth transistor M6 is connected to the ith scan line Si. The sixth transistor M6 is turned on when a scan signal is supplied to the ith scan line Si to supply the data signal from the data line Dm to the first node N1.

The first electrode of the seventh transistor M7 is connected to the first power source ELVDD and the second electrode thereof is connected to the first node N1. The gate electrode of the seventh transistor M7 is connected to the emission control line Ei. The seventh transistor M7 is turned off when the emission control signal is supplied to the emission control line Ei and turned on when the emission control signal is not supplied.

The first electrode of the eighth transistor M8 is connected to the second electrode of the second transistor M2, and the second electrode of the eighth transistor M8 is connected to the anode electrode of the organic light emitting diode OLED. The gate electrode of the eighth transistor M8 is connected to the emission control line Ei. The eighth transistor M8 is turned off when the emission control signal is supplied to the emission control line Ei, and turned on when the emission control signal is not supplied.

The storage capacitor Cst is connected between the first power source ELVDD and the second node N2. The storage capacitor Cst stores a data signal and a voltage corresponding to a threshold voltage of the second transistor M2.

In addition, a parasitic capacitor Cp exists between the second node N2 and the anode electrode of the organic light emitting diode OLED. This parasitic capacitor Cp is generated during the process and is driven by a coupling capacitor. In other words, the parasitic capacitor Cp is connected to the second node N2 (or the anode electrode of the organic light emitting diode OLED) corresponding to the change of the anode electrode voltage (or the second node N2) of the organic light emitting diode OLED. ) Is changed.

3 is a waveform diagram showing a driving method according to an embodiment of the present invention.

Referring to Fig. 3, a scan signal is supplied to the i-1 scan line Si-1. The emission control signal is not supplied to the emission control line Ei during the first period T1 of the period during which the scan signal is supplied to the (i-1) th scan line Si-1.

When the scan signal is supplied to the (i-1) th scan line Si-1, the fourth transistor M4 and the fifth transistor M5 are turned on. When the fifth transistor M5 is turned on, the voltage of the initialization power source Vint is supplied to the second node N2, so that the second node N2 is initialized to the voltage of the initialization power source Vint. When the fourth transistor M4 is turned on, the second electrode of the second transistor M2 and the second node N2 are electrically connected.

Since the seventh transistor M7 is set in the turn-on state during the first period T1, the first power ELVDD is supplied to the first node N1. Therefore, during the first period T1, the first power source ELVDD is supplied to the first node N1, and the reset power source Vint is supplied to the second node N2, Is set to the on-bias state.

When the second transistor M2 is set to the on-bias state, the characteristic curve (threshold voltage characteristic, etc.) is initialized to the on-bias state irrespective of the data signal supplied in the previous period. That is, in the present invention, the second transistor M2 is initialized to the on-bias state before the data signal is supplied, and thus the image of the desired luminance can be displayed irrespective of the data signal supplied in the previous period.

In detail, when the second transistor M2 is not set to the on-bias state, the characteristics (e.g., threshold voltage, etc.) of the second transistor M2 included in each of the pixels 140 are And are non-uniformly set correspondingly. As described above, if the characteristics of the second transistor M2 included in each of the pixels 140 are unevenly set, light of different brightness can be generated in each of the pixels 140 even if the same data signal is supplied. Therefore, in the present invention, the second transistor M2 is initialized to the on-bias state before the data signal is supplied, thereby displaying a uniform image.

The current supplied from the first power source ELVDD during the first period T1 during which the second transistor M2 is set in the on-bias state is supplied to the fourth transistor M4 and the fifth transistor M5, To the initialization power supply Vint. Therefore, it is possible to prevent the organic light emitting diode (OLED) from emitting light by the unnecessary current during the first period (T1).

The anode electrode of the organic light emitting diode OLED is electrically connected to the initialization power source Vint via the eighth transistor M8, the fourth transistor M4 and the fifth transistor M5 during the first period T1. do. Therefore, the anode electrode of the organic light emitting diode OLED is set to the voltage of the initialization power supply Vint for the first period T1.

The emission control signal is supplied to the emission control line Ei during the second period T2 of the period during which the scan signal is supplied to the (i-1) th scan line Si-1. When the emission control signal is supplied to the emission control line Ei, the seventh transistor M7 and the eighth transistor M8 are turned off. When the seventh transistor M7 is turned off, the first power ELVDD and the first node N1 are electrically disconnected. When the eighth transistor M8 is turned off, the second transistor M2 and the organic light emitting diode OLED are electrically disconnected.

Then, a scan signal is supplied to the i-th scan line Si during the third period T3. When the scan signal is supplied to the ith scan line Si, the third transistor M3 and the sixth transistor M6 are turned on. When the third transistor M3 is turned on, the second transistor M2 is connected in a diode form. When the sixth transistor M6 is turned on, the data signal from the data line Dm is supplied to the first node N1. At this time, since the second node N2 is initialized to the voltage of the initialization power source Vint, the second transistor M2 is turned on. When the second transistor M2 is turned on, a voltage obtained by subtracting the threshold voltage of the second transistor M2 from the voltage of the data signal applied to the first node N1 is supplied to the second node N2. At this time, the storage capacitor Cst stores the voltage applied to the second node N2.

In addition, during the third period T3, the voltage of the second node N2 rises from the voltage of the initializing power supply Vint to the voltage of the data signal. At this time, the anode electrode voltage of the organic light emitting diode OLED also increases due to the coupling of the parasitic capacitor Cp.

The scan signal is supplied to the (i + 1) th scan line Si + 1 during the fourth period T4 after the storage capacitor Cst is charged with the voltage corresponding to the data signal. When the scan signal is supplied to the (i + 1) th scan line Si + 1, the first transistor M1 is turned on.

When the first transistor M1 is turned on, a voltage of the initialization power source Vint is supplied to the anode electrode of the organic light emitting diode OLED. When the voltage of the initialization power source Vint is supplied to the anode electrode of the organic light emitting diode OLED, the organic capacitor Coled is discharged.

Meanwhile, during the fourth period T4, the anode electrode of the organic light emitting diode OLED is lowered to a voltage of the initialization power source Vint at a predetermined voltage. Then, by the coupling of the parasitic capacitor Cp, the voltage of the second node N2 is lowered corresponding to the width of the anode electrode voltage of the organic light emitting diode OLED. In this case, the second node N2 is set to a voltage lower than the voltage of the data signal.

Thereafter, the supply of the emission control signal to the emission control line Ei is stopped during the fifth period T5. When the supply of the emission control signal to the emission control line Ei is interrupted, the seventh transistor M7 and the eighth transistor M8 are turned on. When the seventh transistor M7 and the eighth transistor M8 are turned on, a current path from the first power source ELVDD to the second power source ELVSS is formed via the organic light emitting diode OLED. At this time, the second transistor M2 controls the amount of current flowing from the first power source ELVDD to the organic light emitting diode OLED in response to the voltage applied to the second node N2.

Meanwhile, during the fifth period T5, the anode electrode of the organic light emitting diode OLED rises from the voltage of the initialization power source Vint to a predetermined voltage. Then, the voltage of the second node N2 rises in response to the voltage increase of the organic light emitting diode OLED by the coupling of the parasitic capacitor Cp. In this case, the second node N2 is set to the voltage of the data signal substantially, and accordingly, the image of the desired luminance can be displayed.

In other words, in the present invention, the voltage of the second node N2 is lowered during the fourth period T4, and the voltage of the second node N2 is raised during the fifth period T5. Thus, the second node N2 is set to a voltage of a substantially desired data signal, thereby displaying an image with a desired luminance.

In the present invention, the transistors are shown as PMOS for convenience of description, but the present invention is not limited thereto. In other words, the transistors may be formed of NMOS.

Also, in the present invention, the organic light emitting diode (OLED) may generate red, green or blue light or produce white light according to the amount of current. When the organic light emitting diode (OLED) generates white light, a color image can be implemented using a separate color filter or the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention.

110: scan driver 120:
130: pixel portion 140: pixel
142: pixel circuit 150: timing control section

Claims (13)

An organic light emitting diode having a cathode electrode connected to a second power source;
A first transistor connected between the voltage source and the anode electrode of the organic light emitting diode and turned on when a scan signal is supplied to the (i + 1) th scan line;
A second transistor for controlling an amount of current supplied to the organic light emitting diode from a first power source connected via a first node corresponding to a voltage applied to the second node;
A third transistor connected between a second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the ith scan line;
And a fourth transistor connected between the second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the (i-1) th scan line. The method according to claim 1,
A fifth transistor connected between the second node and an initialization power source and turned on when a scan signal is supplied to the (i-1) th scan line;
And a sixth transistor connected between the data line and the first node and turned on when a scan signal is supplied to the ith scan line. 3. The method of claim 2,
Wherein the reset power source is set to a voltage lower than a data signal supplied to the data line. 3. The method of claim 2,
Wherein the voltage source is the second power source or the initialization power source. The method according to claim 1,
A seventh transistor connected between the first power source and the first node, the seventh transistor being turned off when the emission control signal is supplied to the emission control line and being turned on in other cases;
An eighth transistor connected between the second electrode of the second transistor and the anode electrode of the organic light emitting diode and turned off when the emission control signal is supplied to the emission control line, And a pixel electrode. 6. The method of claim 5,
And the seventh transistor partially overlaps the turn-on period with the fourth transistor. 6. The method of claim 5,
And the seventh transistor does not overlap the turn-on period with the first transistor and the third transistor. A scan driver for supplying a scan signal to the scan lines and supplying a light emission control signal to the emission control lines;
A data driver for supplying a data signal to data lines;
And pixels located in a region partitioned by the scan lines and the data lines;
Each of the pixels located in the ith horizontal line (i is a natural number)
An organic light emitting diode having a cathode electrode connected to a second power source;
A first transistor connected between a voltage source and an anode electrode of the organic light emitting diode, the first transistor being turned on when a scan signal is supplied to the (i + 1) th scan line;
A second transistor for controlling an amount of current supplied to the organic light emitting diode from a first power source connected via a first node corresponding to a voltage applied to the second node;
A third transistor connected between a second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the ith scan line;
And a fourth transistor connected between the second electrode of the second transistor and the second node and turned on when a scan signal is supplied to the (i-1) th scan line. 9. The method of claim 8,
A fifth transistor connected between the second node and an initialization power source and turned on when a scan signal is supplied to the (i-1) th scan line;
And a sixth transistor connected between the data line and the first node and turned on when a scan signal is supplied to the ith scan line. 10. The method of claim 9,
Wherein the reset power source is set to a voltage lower than the data signal. 10. The method of claim 9,
Wherein the voltage source is the second power source or the initialization power source. 9. The method of claim 8,
A seventh transistor which is connected between the first power source and the first node and is turned off when the emission control signal is supplied to the i th emission control line and is turned on in the other case;
An eighth light emitting control line connected between the second electrode of the second transistor and the anode electrode of the organic light emitting diode and turned off when the emission control signal is supplied to the i th emission control line, Wherein the organic light emitting display further comprises a transistor. 13. The method of claim 12,
The scan driver may further include an emission control signal which is superimposed on the scan signals supplied to the i-th scan line to the i-th emission control line and overlaps the scan signals supplied to the i-th scan line and the (i + 1) The organic light emitting display device comprising:

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