TWI612511B - Pixel and organic light emitting display using the same - Google Patents

Abstract

A pixel includes an organic light emitting diode, a first driver, and a second driver. The second driver controls the amount of current supplied from the first power source to the organic light emitting diode, the current amount corresponding to the previous data signal. The first driver stores the current data signal supplied from the data line and supplies the previous data signal to the second driver. In the pixel, the second driver includes: a sixth transistor coupled between the initialization power source and the first node, the first node coupled to the gate of the first transistor, and the sixth transistor configured to be at the first And the seventh transistor is coupled between the first power source and a second node, the second node is coupled to the first driver and the second driver, and the seventh transistor is configured to be in the first A control signal is turned on when it is supplied.

Description

Pixel and organic light emitting display using the same

Embodiments of the present invention relate to a pixel and an organic light emitting display using the same.

With the recent development of information technology, the importance of displays as a means of presenting information has increased. Therefore, flat panel displays (FPDs) such as liquid crystal displays (LCDs), organic light-emitting displays, and plasma display panels (PDPs) are becoming more and more widely used.

An organic light emitting display displays an image using an organic light emitting diode that emits light by a combination of electrons and holes. The organic light emitting display has a fast response speed and low power consumption.

Embodiments of the present invention provide a pixel and an organic light emitting display using the same, which can be driven at a low frequency.

Embodiments of the present invention also provide a pixel and an organic light emitting display using the same, which can improve display quality by compensating for degradation of the organic light emitting diode.

According to an embodiment of the present invention, a pixel is provided, the pixel includes: an organic light emitting diode; and a second driver for controlling supply from a first power source to the organic light emitting a current amount of the diode, the current amount corresponding to a previous data signal; and a first driver for storing a current data signal from a data line supply and supplying the previous data signal to the second driver The second driver includes: a sixth transistor coupled between an initialization power source and a first node, the first node coupled to a gate of a first transistor, the sixth The transistor is configured to be turned on when a first control signal is supplied; and a seventh transistor coupled between the first power source and a second node, the second node being commonly coupled to the first driver and the And a second driver configured to be turned on when the first control signal is supplied.

The initialization power supply can be set to have a voltage that is lower than a voltage of a data signal supplied to the data line.

The first driver may include: a second transistor coupled between the data line and a third node, the second transistor being configured to be turned on when a scan signal is supplied to a scan line; a transistor coupled between the third node and the second node, the third transistor being configured to be turned on when a second control signal is supplied; and a second capacitor coupled to the third node and the Initialize between power supplies.

The third transistor and the sixth transistor may have a turn-on period that does not overlap each other.

The second transistor may have one on period that does not overlap the on period of the third transistor and the sixth transistor.

The second driver may include: an eighth transistor coupled between the first power source and the second node, the second node being coupled to one of the first electrodes of the first transistor, the eighth transistor being Configured to turn off when an illumination control signal is supplied, while an illumination control signal is not When being supplied, conducting; a fifth transistor coupled between the first node and a second electrode of the first transistor, the fifth transistor being configured to be turned on when a second control signal is supplied; a ninth transistor coupled between the second electrode of the first transistor and an anode of the organic light emitting diode, the ninth transistor being configured to be turned off when the light emission control signal is supplied, And turning on when the illumination control signal is not supplied; and a first capacitor coupled between the first node and the first power source.

The eighth transistor may have one on period that does not overlap the on period of the fifth transistor and the sixth transistor.

The fifth transistor and the sixth transistor may have a conduction period that does not overlap each other.

The second driver may further include: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured to be turned on when the first control signal is supplied .

The second driver may further include: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured to be turned on when the second control signal is supplied .

The second driver may further include: a fourth transistor between the anode of the organic light emitting diode and a second control line, the second control signal being supplied to the second control line, the fourth The transistor has a gate coupled to one of the second control lines.

The second driver may further include a photodiode, the photodiode being coupled in parallel to the first capacitor between the first node and the first power source.

The photodiode can control the increment of the voltage at the first node, the incremental pair Should be the brightness of the organic light-emitting diode.

The photodiode can control the increment of the voltage at the first node in proportion to the brightness of the organic light emitting diode.

The second driver may further include: a third capacitor coupled between the anode of the organic light emitting diode and the second node.

According to an embodiment of the present invention, an organic light emitting display includes: a control driver for supplying a first control signal to a first control line during a first period of a frame, And supplying a second control signal to a second control line; a scan driver for supplying an illumination control signal to the illumination during the first period, the second period, and the third period of the frame a control line, and progressively supplying a scan signal to the plurality of scan lines during a fourth period of one of the frames; a data driver for synchronizing with the scan signal during the fourth period of the frame Supplying a data signal to a plurality of data lines; and a plurality of pixels located in an area defined by the scan lines and the data lines, the pixels being used to store a current during one of the pixel illumination periods Information signal, the light emitted by the pixels corresponds to a pre-data signal.

The pre-data signal can be supplied as a data signal in a pre-frame, and the current data signal can be supplied as a data signal in a current frame.

The scan driver can simultaneously supply a scan signal to the scan lines during the third period.

The data driver can supply a reset voltage to the data lines during the third period.

The reset voltage can be set to be within a voltage range of the data signal A voltage.

Each of the pixels can control an amount of current flowing from a first power source to a second power source via an organic light emitting diode, the current amount corresponding to the previous data signal.

The first power source may be set to a first voltage during the fourth period, and may be set to be different from the second voltage of the first voltage during the first period to the third period.

The second voltage can be a voltage lower than one of the first voltages.

Each of the pixels may include: an organic light emitting diode; a second driver for controlling a current amount supplied from the first power source to the organic light emitting diode, the current amount corresponding to the previous data signal; And a first driver for storing the current data signal and supplying the previous data signal to the second driver.

The first driver may include: a second transistor coupled between the corresponding data line of the data lines and a third node, the second transistor being configured to be supplied to the scan signal One of the scan lines is turned on when the scan line is corresponding; a third transistor is coupled between the third node and a second node, the second node is commonly coupled to the first driver and the second driver, the first The tri-crystal is configured to be turned on when the second control signal is supplied; and a second capacitor is coupled between the third node and an initialization power source.

The second driver can include: a first transistor configured to have a first electrode coupled to the first power source via the second node, the second node being commonly coupled to the first driver and the second driver The first transistor has a gate coupled to a first node; a fifth transistor coupled between the second electrode of the first transistor and the first node, the fifth transistor being Configuring to turn on when the second control signal is supplied; a sixth transistor coupled Between the first node and the initialization power source, the sixth transistor is configured to be turned on when the first control signal is supplied; a seventh transistor coupled to the second node and the first power source The seventh transistor is configured to be turned on when the first control signal is supplied; an eighth transistor coupled between the second node and the first power source, the eighth transistor being configured to be The illuminating control signal is turned off when supplied, and turned on when the illuminating control signal is not supplied; and a ninth transistor is coupled to the second electrode of the first transistor and one of the organic light emitting diodes Between the anodes, the ninth transistor is configured to turn off when the illuminating control signal is supplied, and to turn on when the illuminating control signal is not supplied.

The initialization power supply can be set to be lower than one of the data signals.

The second driver may further include: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured to be turned on when the first control signal is supplied .

The second driver may further include: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured to be turned on when the second control signal is supplied .

The second driver may further include: a fourth transistor between the anode of the organic light emitting diode and the second control line, the fourth transistor having a gate coupled to the second control line .

The second driver may further include a photodiode coupled to the first capacitor in parallel between the first node and the first power source.

The photodiode can control an increase in voltage at the first node, the increment corresponding to the brightness of the organic light emitting diode.

According to an embodiment of the present invention, a pixel is provided, the pixel includes: an organic light emitting diode; and a second driver for controlling a current amount supplied from a first power source to the organic light emitting diode The current amount corresponds to a pre-data signal; and a first driver is configured to store a current data signal from a data line supply and supply the pre-data signal to the second driver, wherein the second driver includes: a fourth transistor coupled between the anode of the organic light emitting diode and an initial power source, the fourth transistor being configured to be turned on when a first control signal is supplied; and a seventh transistor Coupled between the first power source and a second node, the second node is commonly coupled to the first driver and the second driver, the seventh transistor being configured to be turned on when the first control signal is supplied.

The first driver may further include: a second transistor coupled between the data line and a third node, the second transistor being configured to be turned on when a scan signal is supplied to a scan line; a third transistor coupled between the third node and the second node, the third transistor being configured to be turned on when a second control signal is supplied; and a second capacitor coupled to the third node This initializes between power supplies.

The second driver may further include: a fifth transistor coupled between a first node and a second electrode of a first transistor, the first node being coupled to one of the gates of the first transistor, The fifth transistor is configured to be turned on when a second control signal is supplied; a sixth transistor coupled between the initialization power source and the first node, the sixth transistor being configured to be at the first The control signal is turned on when supplied; an eighth transistor coupled between the first power source and the second node, the second node coupled to one of the first electrodes of the first transistor, the eighth transistor being Configuring to turn off when an illumination control signal is supplied, and to turn on when an illumination control signal is not supplied; a ninth transistor coupled to the second electrode of the first transistor and the organic Between the anodes of the photodiodes, the ninth transistor is configured to be turned off when the illuminating control signal is supplied, and turned on when the illuminating control signal is not supplied; and a first capacitor coupled to the first A node is between the first power source.

The eighth transistor may have one on period that does not overlap the on period of the fifth transistor and the sixth transistor.

The fifth transistor and the sixth transistor may have a conduction period that does not overlap each other.

The photodiode can control the increment of the voltage at the first node in proportion to the brightness of the organic light emitting diode.

The second driver may further include: a third capacitor coupled between the anode of the organic light emitting diode and the second node.

1F‧‧‧ frame

110‧‧‧Scan Drive

120‧‧‧Control drive

130‧‧‧Data Drive

140‧‧‧Display unit

142‧‧ ‧ pixels

144‧‧‧ pixel circuit

146‧‧‧First drive

148‧‧‧second drive

150‧‧‧ timing controller

200‧‧‧ pixel circuit

202‧‧‧Second drive

210‧‧‧ pixel circuit

212‧‧‧Second drive

220‧‧‧ pixel circuit

222‧‧‧second drive

230‧‧‧ pixel circuit

232‧‧‧second drive

240‧‧‧ pixel circuit

242‧‧‧Second drive

C1, C2‧‧‧ first capacitor, second capacitor

CL1‧‧‧ first control line

CL2‧‧‧Second control line

D1~Dm‧‧‧ data line

E‧‧‧Lighting control line

ELVDD‧‧‧First power supply

ELVSS‧‧‧second power supply

J‧‧‧ Grayscale

L‧‧‧Learning of the left information signal

LD‧‧‧Left information signal

M1~M9‧‧‧First transistor ~ ninth transistor

M4', M4"‧‧‧ fourth transistor

N1~N4‧‧‧first node~fourth node

OLED‧‧ Organic Light Emitting Diode

PD‧‧‧Photoelectric diode

R‧‧‧Glowing of the right information signal

RD‧‧‧Right information signal

S1~Sn‧‧‧ scan line

T1~T4‧‧‧First Cycle ~ Fourth Cycle

V1‧‧‧ first voltage

Vint‧‧‧Initial power supply

VDD1, VDD2‧‧‧first voltage, second voltage

Vr‧‧‧Reset voltage

The exemplary embodiments are described more fully hereinafter with reference to the accompanying drawings; Rather, the embodiments are provided so that this disclosure will be thorough and complete, and the scope of the exemplary embodiments will be fully conveyed by those skilled in the art.

In the drawings, the dimensions may be exaggerated for clarity. It will be understood that when an element is "between" and "between" the element, the element can be the only element between the two elements, or one or more intermediate elements can be present. The same reference numerals are used throughout the drawings to refer to the same elements.

1 is an organic light emitting display according to an embodiment of the present invention; and FIG. 2 is a circuit diagram of a pixel according to a first embodiment of the present invention; 3 is a waveform diagram of a driving method according to an embodiment of the present invention; FIG. 4 is a waveform diagram of a driving method according to another embodiment of the present invention; and FIG. 5 is a waveform diagram of another embodiment of the present invention. A waveform diagram of a driving method; FIG. 6 is a driving frequency of a 3D driving of an embodiment; FIG. 7 is a circuit diagram of a pixel of a second embodiment of the present invention; A circuit diagram of one of the three embodiments; FIG. 9 is a diagram showing an increase in voltage at a first node, the increment corresponding to degradation of an organic light-emitting diode; and FIG. 10 is a fourth embodiment of the present invention. 1 is a circuit diagram of a pixel of a fifth embodiment of the present invention; and FIG. 12 is a circuit diagram of a pixel of a sixth embodiment of the present invention.

Hereinafter, some exemplary embodiments of the present invention will be described with reference to the drawings. Herein, when a first component is coupled to a second component, the first component can be directly coupled to the second component or can be indirectly coupled to the second component via a third component. In addition, some of the elements that are not essential to a thorough understanding of the invention are omitted for clarity. In addition, the same reference numerals are used throughout the drawings.

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

Referring to FIG. 1 , the organic light emitting display according to the present embodiment includes: a plurality of pixels located in an area defined by the scan lines S1 to Sn and the data lines D1 to Dm; a display unit 140 including a pixel 142; a scan driver 110 for driving the scan lines S1 to Sn and an illumination control line E; a control driver 120 for driving the first control line CL1 and the second control line CL2; A data driver 130 for driving the data lines D1 to Dm; and a timing controller 150 for controlling the scan driver 110, the control driver 120, and the data driver 130.

The scan driver 110 supplies a scan signal to the scan lines S1 to Sn. For example, the scan driver 110 can progressively supply the scan signals to the scan lines S1 to Sn during a fourth period T4 of one frame 1F as shown in FIG. The scan driver 110 can synchronously (e.g., simultaneously) supply scan signals to the scan lines S1 to Sn during a third period T3 of one frame 1F as shown in FIG.

The scan driver 110 supplies an illumination control signal to the illumination control line E, which is coupled to each pixel 142 at the same time. For example, the scan driver 110 can supply the illumination control signal to the illumination control line E during other periods T1, T2, and T3 of the frame 1F other than the fourth period T4. Herein, the scan signal supplied from the scan driver 110 is set such that the transistor included in the pixel 142 is turned on by a voltage (for example, a low voltage), and the light emission control signal is set to turn off the voltage of the transistor. (Example: a high voltage).

The control driver 120 supplies a first control signal to the first control line CL1 coupled to each pixel 142 at the same time, and supplies a second control signal to the second control line CL2 coupled to each pixel 142 at the same time. Herein, the first control signal CL1 and the second control signal CL2 do not overlap each other. For example, the control driver 120 supplies the first control signal to the first control line CL1 during one of the first periods T1 of the frame 1F, and supplies the second control during one of the second periods T2 of the frame 1F. Signal to the second control line CL2. Herein, the first control signal and the second control signal are set such that the transistor is turned on by a voltage (for example, a low voltage).

During the fourth period T4 of the frame 1F, the data driver 130 supplies a data signal to the data lines D1 to Dm in synchronization with the scanning signals supplied to the scanning lines S1 to Sn. This article The data driver 130 can alternately supply the left data signal and the right data signal in each frame to achieve a 3D drive. In addition, the data driver 130 may supply a reset voltage Vr to the data lines D1 to Dm during the third period T3 of the frame 1F. Herein, the reset voltage Vr can be set to a voltage within a voltage range of one of the data signals.

The timing controller 150 controls the scan driver 110, the control driver 120, and the data driver 130 corresponding to one of the synchronization signals supplied from the outside of the organic light emitting display.

The display unit 140 includes a pixel 142 located in an area defined by the scan lines S1 to Sn and the data lines D1 to Dm. During the fourth period T4, the pixel 142 is filled with a data signal (a current data signal) of one current frame, and synchronously (for example, simultaneously) sends a data signal corresponding to one of the previous frames (for example: The light of the previous data signal). For this reason, during the fourth period T4, the pixel 142 controls the amount of current flowing from a first power source ELVDD to a second power source ELVSS via the organic light emitting diode.

Although for convenience of illustration, the light-emitting control line E is coupled to the scan driver 110 in FIG. 1 and the control lines CL1 and CL2 are coupled to the control driver 120, the present invention is not limited thereto. In fact, the illumination control line E and the control lines CL1 and CL2 can be coupled to various drivers. For example, the illumination control line E and the control lines CL1 and CL2 can be coupled to the scan driver 110 in common.

Fig. 2 is a circuit diagram of a pixel of a first embodiment of the present invention. For convenience of illustration, FIG. 2 will show a pixel coupled to an mth data line Dm and an nth scan line Sn.

Referring to FIG. 2, the pixel 142 according to the present embodiment includes: an organic light emitting diode OLED; and a pixel circuit 144 for controlling a current amount supplied to the organic light emitting diode OLED.

One of the organic light emitting diode OLEDs is anodically coupled to the pixel circuit 144, and one of the organic light emitting diode OLEDs is cathode coupled to the second power source ELVSS. The organic light emitting diode OLED generates light corresponding to a current amount supplied from the pixel circuit 144 (for example, light having a predetermined luminance). The second power source ELVSS is set to have a voltage lower than a voltage of the first power source ELVDD so that current can flow through the organic light emitting diode OLED.

The pixel circuit 144 includes: a first driver 146 for storing the current data signal; and a second driver 148 for controlling a current amount supplied to the organic light emitting diode OLED, the current amount corresponding to the pre-data signal .

The first driver 146 stores the current data signal supplied from the data line Dm, and synchronously (for example, simultaneously) supplies the data signal stored in the previous frame to the second driver 148. To this end, the first driver 146 includes a second transistor M2, a third transistor M3, and a second capacitor C2.

One of the first electrodes of the second transistor M2 is coupled to the data line Dm, and one of the second electrodes of the second transistor M2 is coupled to a third node N3. One of the gates of the second transistor M2 is coupled to the scan line Sn. When the scan signal is supplied to the scan line Sn, the second transistor M2 is turned on to supply the data signal from the data line Dm to the third node N3.

One of the first electrodes of the third transistor M3 is coupled to the third node N3, and one of the second electrodes of the third transistor M3 is coupled to the second driver 148 (eg, at a second node N2). One of the gates of the third transistor M3 is coupled to the second control line CL2. When the second control signal is supplied to the second control line CL2, the third transistor M3 is turned on to enable the third node N3 and the second node N2 to be electrically coupled to each other.

The second capacitor C2 is coupled to the third node N3 and a fixed voltage source (eg: An initialization power supply between Vint). During a period in which the second transistor M2 is turned on, the second capacitor C2 is charged with a voltage corresponding to one of the current data signals.

The second driver 148 is charged with a voltage and controls a current amount flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED, the voltage corresponding to the previous data signal supplied from the first driver 146, the current The amount corresponds to the charged voltage. To this end, the second driver 148 includes a first transistor M1, a fourth transistor M4 to a ninth transistor M9, and a first capacitor C1.

A first electrode of the first transistor (eg, a driving transistor) M1 is coupled to the second node N2, and one of the first electrodes of the first transistor M1 is coupled to a fourth node N4. One of the gates of the first transistor M1 is coupled to a first node N1. The first transistor M1 controls an amount of current supplied to the organic light emitting diode OLED, the amount of current corresponding to a voltage applied to one of the first nodes N1.

One of the first electrodes of the fourth transistor M4 is coupled to the anode of the organic light emitting diode OLED, and one of the second electrodes of the fourth transistor M4 is coupled to the initialization power source Vint. One of the gates of the fourth transistor M4 is coupled to the first control line CL1. When the first control signal is supplied to the first control line CL1, the fourth transistor M4 is turned on to supply the voltage of the initialization power source Vint to the anode of the organic light emitting diode OLED. In this paper, the initialization power source Vint is set to be lower than one of the data signals. For example, the initialization power source Vint can be set to be lower than a voltage obtained by subtracting the absolute threshold voltage of the first transistor M1 from the data signal having the lowest voltage.

One of the first electrodes of the fifth transistor M5 is coupled to the fourth node N4, and one of the second electrodes of the fifth transistor M5 is coupled to the first node N1. One of the gates of the fifth transistor M5 is coupled to the second control line CL2. When the second control signal is supplied to the second control line CL2, the fifth transistor M5 is turned on to enable the first node N1 and the fourth node N4 to be electrically coupled to each other. When the first node N1 and the fourth node N4 are electrically coupled to each other, the first transistor M1 is diode-coupled in the form of a diode.

One of the first electrodes of the sixth transistor M6 is coupled to the first node N1, and one of the second electrodes of the sixth transistor M6 is coupled to the initialization power source Vint. One of the gates of the sixth transistor M6 is coupled to the first control line CL1. When the first control signal is supplied to the first control line CL1, the sixth transistor M6 is turned on to supply the voltage of the initialization power source Vint to the first node N1.

One of the first electrodes of the seventh transistor M7 is coupled to the first power source ELVDD, and one of the second electrodes of the seventh transistor M7 is coupled to the second node N2. One of the gates of the seventh transistor M7 is coupled to the first control line CL1. When the first control signal is supplied to the first control line CL1, the seventh transistor M7 is turned on to supply the voltage of the first power source ELVDD to the second node N2.

One of the first electrodes of the eighth transistor M8 is coupled to the first power source ELVDD, and one of the second electrodes of the eighth transistor M8 is coupled to the second node N2. A gate of the eighth transistor M8 is coupled to the illumination control line E. The eighth transistor M8 is turned off when the light emission control signal is supplied to the light emission control line E, and is turned on when the light emission control signal is not supplied.

One of the first electrodes of the ninth transistor M9 is coupled to the fourth node N4, and one of the second electrodes of the ninth transistor M9 is coupled to the anode of the organic light emitting diode OLED. A gate of the ninth transistor M9 is coupled to the illumination control line E. The ninth transistor M9 is turned off when the light emission control signal is supplied to the light emission control line E, and is turned on when the light emission control signal is not supplied.

The first capacitor C1 is coupled between the first power source ELVDD and the first node N1. The first capacitor C1 is charged with a voltage corresponding to the pre-data signal and the threshold voltage of the first transistor M1.

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

Referring to Fig. 3, a frame according to the present embodiment is divided into a first period T1 to a fourth period T4.

First, the light emission control signal is supplied during the first period T1 to the third period T3, and the light emission control signal is not supplied during the fourth period T4. When the light emission control signal is supplied, the eighth transistor M8 and the ninth transistor M9 are turned off. When the ninth transistor M9 is turned off, the first transistor M1 and the organic light emitting diode OLED are no longer electrically coupled to each other, whereby the organic light emitting diode is during the first period T1 to the third period T3 The OLED is set to a non-light emitting state.

During the first period T1, the first control signal is supplied to the first control line CL1. When the first control signal is supplied to the first control line CL1, the fourth transistor M4, the sixth transistor M6, and the seventh transistor M7 are turned on.

When the fourth transistor M4 is turned on, the voltage of the initialization power source Vint is supplied to the anode of the organic light emitting diode OLED. When the voltage of the initialization power source Vint is supplied to the anode of the organic light emitting diode OLED, a voltage charged in a parasitic capacitor (not shown) is discharged, and the parasitic capacitor is equivalently formed in the organic light emitting diode. In OLED.

When the sixth transistor M6 is turned on, the voltage of the initialization power source Vint is supplied to the first node N1. When the seventh transistor M7 is turned on, the voltage of the first power source ELVDD is supplied to the second node N2. Herein, the initialization power source Vint is set to be lower than one of the data signals, so during the first period T1, the first transistor M1 is set in an on-bias state. Then, the first transistor M1 is initialized in the on-bias state, thereby improving the display quality.

During the second period T2, the second control signal is supplied to the second control line CL2. When the second control signal is supplied to the second control line CL2, the third transistor M3 and the fifth transistor M5 are turned on. When the fifth transistor M5 is turned on, the first transistor M1 is coupled in the form of a diode. When the third transistor M3 is turned on, the voltage of the data signal is supplied to the second node N2 before being stored in the second capacitor C2. In this case, the voltage at the first node N1 is initialized as the voltage of the initialization power source Vint which is lower than the voltage of the data signal, so that the first transistor M1 is turned on.

When the first transistor M1 is turned on, the voltage of the data signal applied to the second node N2 is supplied to the first node N1 via the first transistor M1 coupled in the form of a diode. In this case, the first capacitor C1 stores a voltage corresponding to the data signal and the threshold voltage of the first transistor M1.

During the third period T3, the supply of the illumination control signal to the illumination control line E is maintained.

During the fourth period T4, the supply of the illumination control signal to the illumination control line E is stopped. When the supply of the light emission control signal to the light emission control line E is stopped, the eighth transistor M8 and the ninth transistor M9 are turned on. When the eighth transistor M8 is turned on, the first power source ELVDD and the second node N2 are electrically coupled to each other. When the ninth transistor M9 is turned on, the fourth node N4 and the organic light emitting diode OLED are electrically coupled to each other. Then, the first transistor M1 controls a current amount flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED, the current amount corresponding to the voltage applied to the first node N1. In this case, the organic light emitting diode OLED generates light corresponding to the amount of current supplied to the organic light emitting diode OLED (for example, light having a predetermined luminance).

During the fourth period T4, the scan signal is progressively supplied to the scan lines S1 to Sn. When the scan signal is progressively supplied to the scan lines S1 to Sn, for each horizontal line, each picture The second transistor M2 included in the element 142 is turned on. When the second transistor M2 is turned on, the current data signal from a data line (either one of D1 to Dm) is supplied to the third node N3 included in each pixel 142. In this case, the second capacitor C2 is charged with a voltage corresponding to one of the current data signals. In fact, according to an embodiment of the present invention, an image is displayed by repeating the above steps.

Figure 4 is a waveform diagram of a driving method according to another embodiment of the present invention. Referring to Fig. 4, the description is substantially the same as that shown in Fig. 3, and will not be described again.

Referring to FIG. 4, during the third period T3 of the driving method according to the present embodiment, the scanning signals are supplied to the scanning lines S1 to Sn synchronously (for example, simultaneously), and the resetting voltage Vr is supplied in synchronization with the scanning signals. Data lines D1 to Dm.

When the scan signal is supplied to the nth scan line Sn during the third period T3, the second transistor M2 is turned on. When the second transistor M2 is turned on, the reset voltage Vr is supplied to the third node N3. That is, during the third period T3, the voltage at the third node N3 included in each pixel 142 is initialized as the reset voltage Vr.

Subsequently, during the fourth period T4, the scanning signals are progressively supplied to the scanning lines S1 to Sn. When the scan signal is supplied to the nth scan line Sn, the second transistor M2 is turned on. When the second transistor M2 is turned on, the current data signal from the data line Dm is supplied to the third node N3. In this case, the second capacitor C2 is charged with a voltage corresponding to one of the current data signals.

Here, during the third period T3, the third node N3 is initialized to the reset voltage Vr, so during the fourth period T4, the second capacitor C2 may be charged with a uniform voltage corresponding to one of the current data signals.

For example, after the second period T2, the voltage at the third node N3 included in each pixel 142 is set to a voltage corresponding to the previous data signal. That is, each pixel 142 package The voltages at the third node N3 included are set to be different from each other and correspond to the previous data signals, respectively. Therefore, in the case where the voltage at the third node N3 is not initialized, the voltage of the previous data signal changes the voltage of the current data signal stored in the second capacitor C2, and thus crosstalk may occur.

Figure 5 is a waveform diagram of a driving method according to another embodiment of the present invention. Referring to Fig. 5, the description is substantially the same as that shown in Fig. 4, and will not be described again.

Referring to Fig. 5, in the driving method according to the present embodiment, the voltage of the first power source ELVDD is changed. That is, the first power source ELVDD is set to a first voltage VDD1 during the fourth period T4 in which the pixel 142 emits light, and is set to be during the first period T1 to the third period T3 in which the pixel 142 is not illuminated. The second voltage VDD2 is lower than one of the first voltages VDD1. Herein, the second voltage VDD2 is set to have a voltage higher than one of the initialization power sources Vint, so that the first transistor M1 is set in the on-bias state during the first period T1.

For example, during the first period T1 to the third period T3, the first power source ELVDD is set to the second voltage VDD2. During the fourth period T4, the voltage of the first power source ELVDD rises to the first voltage VDD1.

When the voltage of the first power source ELVDD rises to the first voltage VDD1 during the fourth period T4, the voltage at the first node N1 set to a floating state also rises. When the voltage at the first node N1 rises as described above, the ability to display (or represent) black can be improved.

For example, during the second period T2, the first capacitor C1 is charged with the voltage charged in the second capacitor C2. In this case, the voltage charged in the first capacitor C1 is set to be lower than one of the required voltages, and therefore, when black is displayed (or indicated), the organic light emitting diode OLED emits a small amount of light. Therefore, in this embodiment, the first power source ELVDD The voltage and the voltage at the first node N1 corresponding thereto rise during the fourth period T4, so that when the black is displayed (or indicated), the organic light-emitting diode OLED can be prevented from emitting a small amount of light.

Figure 6 depicts a drive frequency in a 3D drive of an embodiment.

Referring to FIG. 6, an organic light emitting display according to an embodiment of the present invention receives a data signal during an illumination period. That is, during a period in which an image corresponds to a left (or right) data signal, the pixel 142 stores a voltage corresponding to one of the right (or left) data signals. Therefore, in the embodiment of the present invention, a 3D image can be achieved at a driving frequency of 120 Hz. In Fig. 6, RD represents a right data signal, and LD represents a left data signal. Further, R represents the light emission corresponding to the right data signal, and L represents the light emission corresponding to the left data signal.

Figure 7 is a circuit diagram of a pixel of a second embodiment of the present invention. In the seventh drawing, the components substantially the same as those in the second drawing are denoted by the same reference numerals, and therefore will not be described again.

Referring to FIG. 7, the pixel 142 according to the present embodiment includes a pixel circuit 200 and an organic light emitting diode OLED.

The pixel circuit 200 includes: a first driver 146 for storing a current data signal; and a second driver 202 for controlling a current amount supplied to the organic light emitting diode OLED, the current amount corresponding to the previous data signal.

The second driver 202 includes a fourth transistor M4' coupled between the anode of the organic light emitting diode OLED and the initialization power source Vint. One of the gates of the fourth transistor M4' is coupled to the second control line CL2. When the second control signal is supplied to the second control line CL2, the fourth transistor M4' is turned on to supply the voltage of the initialization power source Vint to the anode of the organic light emitting diode OLED. Except for the fourth transistor M4', the operation of the pixel according to the present embodiment is substantially the same as that of the pixel according to the first embodiment, and therefore will not be described again.

Figure 8 is a circuit diagram of a pixel of a third embodiment of the present invention. In the eighth embodiment, the components substantially the same as those in the second embodiment are denoted by the same reference numerals, and therefore will not be described again.

Referring to FIG. 8, the pixel 142 according to the present embodiment includes a pixel circuit 210 and an organic light emitting diode OLED.

The pixel circuit 210 includes: a first driver 146 for storing a current data signal; and a second driver 212 for controlling a current amount supplied to the organic light emitting diode OLED, the current amount corresponding to the previous data signal.

The second driver 212 includes a photodiode PD, and the photodiode PD is juxtaposed to the first capacitor C1 between the first power source ELVDD and the first node N1. The photodiode PD controls a current amount supplied from the first power source ELVDD to the first node N1 (ie, the voltage at the first node N1), which corresponds to the brightness of the organic light emitting diode OLED. In fact, the photodiode PD controls the voltage at the first node N1 to compensate for the degradation of the organic light emitting diode OLED.

In the following, the operation of the pixels will be explained. During the fourth period T4, the photodiode PD controls the amount of current flowing from the first power source ELVDD to the first node N1 in proportion to the brightness of the organic light emitting diode OLED, that is, the voltage at the first node N1. An increment. In other words, the photodiode PD controls the voltage at the first node N1 to increase as the brightness of the organic light emitting diode OLED increases.

For example, when the organic light emitting diode OLED is degraded, the organic light emitting diode OLED generates light having a low luminance corresponding to the same gray scale. Therefore, the photodiode PD changes the voltage at the first node N1 corresponding to the deterioration of the organic light emitting diode OLED. That is, as shown in Fig. 9, although one of the data signals having the same gray scale is supplied, the photodiode PD changes one increment of the voltage at the first node N1.

In the case where the organic light emitting diode OLED emits light corresponding to a specific gray scale j (j is a natural number), the voltage increase at the first node N1 when the organic light emitting diode OLED is deteriorated is set to The voltage at the first node N1 is lower than the first voltage V1 when the organic light emitting diode OLED is not deteriorated. That is, in the embodiment of the present invention, when the organic light emitting diode OLED is deteriorated, the voltage increase at the first node N1 is set to be low, whereby the organic light emitting diode OLED can be compensated The decrease in brightness caused by deterioration.

In fact, according to an embodiment of the present invention, the amount of current supplied to the organic light emitting diode OLED can be expressed as shown in Equation 1.

In Equation 1, μ represents the mobility of the first transistor M1, COX represents the gate capacitance of the first transistor, Vth represents the threshold voltage of the first transistor M1, and W and L represent the first transistor M1. The ratio of channel width to channel length. Further, Vdata represents the voltage of the data signal, and ΔVPD represents the amount of change in the voltage caused by the photodiode PD. Referring to Equation 1, the amount of current supplied to the organic light emitting diode OLED is determined by the voltage of the data signal and the amount of change in the voltage caused by the photodiode PD. In the voltage change caused by the photodiode PD, when the organic light emitting diode OLED is deteriorated, the voltage increase at the first node N1 is set to be low. Therefore, the reduction in the brightness of the organic light emitting diode OLED can be compensated for.

The operation of the pixel 142 according to the present embodiment is substantially the same as that of the first embodiment shown in FIG. 2 except that the photodiode PD is added to compensate for the deterioration of the organic light emitting diode OLED. The operation process of the pixels in the example. Actually, the pixel 142 according to the present embodiment can be driven by the driving waveform diagrams shown in Figs. 3 to 5.

Figure 10 is a circuit diagram of a pixel of a fourth embodiment of the present invention. In the tenth diagram, components which are substantially the same as those shown in FIG. 7 are denoted by the same reference numerals, and therefore will not be described again.

Referring to FIG. 10, the pixel 142 according to the present embodiment includes a pixel circuit 220 and an organic light emitting diode OLED.

The pixel circuit 220 includes: a first driver 146 for storing a current data signal; and a second driver 222 for controlling a current amount supplied to the organic light emitting diode OLED, the current amount corresponding to the previous data signal.

The second driver 222 includes a photodiode PD, and the photodiode PD is coupled in parallel to the first capacitor C1 between the first power source ELVDD and the first node N1. The photodiode PD controls a current amount supplied from the first power source ELVDD to the first node N1 (ie, the voltage at the first node N1), which corresponds to the brightness of the organic light emitting diode OLED. In fact, the photodiode PD controls the voltage at the first node N1 to compensate for the degradation of the organic light emitting diode OLED.

Figure 11 is a circuit diagram of a pixel of a fifth embodiment of the present invention. In the eleventh embodiment, components which are substantially the same as those shown in Fig. 7 are denoted by the same reference numerals, and therefore will not be described again.

Referring to FIG. 11, the pixel 142 according to the present embodiment includes a pixel circuit 230 and an organic light emitting diode OLED.

The pixel circuit 230 includes: a first driver 146 for storing a current data signal; and a second driver 232 for controlling a current amount supplied to the organic light emitting diode OLED, the current amount corresponding to the previous data signal.

The second driver 232 includes a third capacitor C3 coupled to the third capacitor C3. The second node N2 is between the anode of the organic light emitting diode OLED. The third capacitor C3 controls the voltage at the second node N2, which corresponds to the voltage at the anode of the organic light emitting diode OLED. For example, the third capacitor C3 controls the voltage at the second node N2 to compensate for the degradation of the organic light emitting diode OLED.

Any one of the driving waveform diagrams shown in Figs. 3 to 5 can drive the pixel 142 according to the present embodiment.

In the following, the operation of the pixel will be described in conjunction with the driving waveform diagram shown in FIG. During the first period T1 to the third period T3, the light emission control signal is supplied to the light emission control line E, and during the fourth period T4, the light emission control signal is not supplied to the light emission control line E. When the light emission control signal is supplied to the light emission control line E, the eighth transistor M8 and the ninth transistor M9 are turned off. Then, the first transistor M1 and the organic light emitting diode OLED are no longer electrically coupled to each other, whereby the organic light emitting diode OLED is set in the non-light emitting state during the first period T1 to the third period T3. When the ninth transistor M9 is turned off, the anode of the organic light emitting diode OLED is set to a voltage (for example, a predetermined voltage) Voled.

During the first period T1, the first control signal is supplied to the first control line CL1, causing the sixth transistor M6 and the seventh transistor M7 to be turned on. When the sixth transistor M6 is turned on, the voltage of the initialization power source Vint is supplied to the first node N1. When the seventh transistor M7 is turned on, the voltage of the first power source ELVDD is supplied to the second node N2. In this case, the first transistor M1 is initialized in an on-bias state.

During the second period T2, the second control signal is supplied to the second control line CL2. When the second control signal is supplied to the second control line CL2, the third transistor M3, the fourth transistor M4', and the fifth transistor M5 are turned on.

When the fifth transistor M5 is turned on, the first transistor M1 is coupled in the form of a diode. When the third transistor M3 is turned on, the voltage of the data signal is supplied to the second node N2 before being stored in the second capacitor C2. When the fourth transistor M4' is turned on, the voltage Voled at the anode of the organic light emitting diode OLED falls to the voltage of the initialization power source Vint. In this case, due to the coupling of the third capacitor C3, the voltage at the second node N2 is lowered corresponding to the decrease in the voltage at the anode of the organic light emitting diode OLED.

When the voltage of the current data signal is supplied to the second node N2, the first transistor M1 is turned on. When the first transistor M1 is turned on, the voltage applied to the second node N2 is supplied to the first node N1 via the first transistor M1 coupled in the form of a diode. In this case, the first capacitor C1 stores a voltage corresponding to the previous data signal, the threshold voltage of the first transistor M1, and the degradation of the organic light emitting diode OLED.

For example, when the fourth transistor M4' is turned on, the voltage at the anode of the organic light emitting diode OLED changes as shown in Equation 2.

Equation 2: △ Voled = Voled - ( Vint )

In Equation 2, Voled represents the voltage at the anode of the organic light-emitting diode OLED applied during the first period T1. Referring to Equation 2, during the second period T2, the voltage at the anode of the organic light emitting diode OLED drops from the voltage Voled applied during the first period T1 to the voltage of the initialization power source Vint.

In this case, the amount of change in the voltage at the anode of the organic light-emitting diode OLED (ΔVoled) is determined by the deterioration of the organic light-emitting diode OLED. In fact, with organic The light-emitting diode OLED is deteriorated, and the resistance of the organic light-emitting diode OLED is increased. Therefore, as the organic light emitting diode OLED is deteriorated, the amount of change (ΔVoled) of the voltage at the anode of the organic light emitting diode OLED increases.

For example, the resistance of the organic light emitting diode OLED increases corresponding to the deterioration of the organic light emitting diode OLED. When the resistance of the organic light emitting diode OLED increases, the voltage Voled at the anode of the organic light emitting diode OLED applied during the first period T1 increases. Therefore, as the organic light emitting diode OLED is deteriorated, the amount of decrease in the voltage at the second node N2 is increased, whereby the deterioration of the organic light emitting diode OLED can be compensated. In other words, when the voltage at the second node N2 decreases, the voltage at the first node N1 also decreases. Therefore, as the organic light emitting diode OLED is deteriorated, the amount of current supplied to one of the organic light emitting diode OLEDs is increased, thereby compensating for the deterioration of the organic light emitting diode OLED.

During the third period T3, the supply of the illumination control signal to the illumination control line E is maintained.

During the fourth period T4, the supply of the light emission control signal to the light emission control line E is stopped, so that the eighth transistor M8 and the ninth transistor M9 are turned on. When the eighth transistor M8 is turned on, the first power source ELVDD and the second node N2 are electrically coupled to each other. When the ninth transistor M9 is turned on, the fourth node N4 and the anode of the organic light emitting diode OLED are electrically connected to each other. Then, the first transistor M1 controls a current amount flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED, the current amount corresponding to the voltage applied to the first node N1. In this case, the organic light emitting diode OLED generates light corresponding to the amount of current supplied to the organic light emitting diode OLED (for example, light having a predetermined luminance).

During the fourth period T4, the scan signal is progressively supplied to the scan line S1 to Sn. When the scan signal is progressively supplied to the scan lines S1 to Sn, for each horizontal line, the second transistor M2 included in each pixel 142 is turned on. When the second transistor M2 is turned on, the current data signal from a data line (either one of D1 to Dm) is supplied to the third node N3 included in each pixel 142. In this case, the second capacitor C2 is charged with a voltage corresponding to one of the current data signals. In fact, in an embodiment in accordance with the invention, the image is displayed by repeating the above steps.

Figure 12 is a circuit diagram illustrating a pixel according to a sixth embodiment of the present invention. In Fig. 12, the components denoted substantially the same as those in Fig. 11 are denoted by the same reference numerals, and therefore will not be described again.

Referring to Fig. 12, the pixel according to the present embodiment includes a pixel circuit 240 and an organic light emitting diode OLED.

The pixel circuit 240 includes: a first driver 146 for storing a current data signal; and a second driver 242 for controlling a current amount supplied to the organic light emitting diode OLED, the current amount corresponding to the previous data signal.

The second driver 242 includes a fourth transistor M4'' coupled between the second control line CL2 and the organic light emitting diode OLED. One of the gates of the fourth transistor M4'' is coupled to the second control line CL2. That is, the fourth transistor M4'' is coupled in the form of a diode. When the second control signal is supplied to the second control line CL2, the fourth transistor M4'' enables the voltage at the anode of the organic light emitting diode OLED to be reduced to a voltage of about the second control signal.

That is, except for the voltage Voled at the anode of the organic light emitting diode OLED falling to the voltage of the second control signal instead of the voltage of the initialization power source Vint, the pixel according to the embodiment The operation process is substantially the same as the pixel according to the fifth embodiment shown in Fig. 11. Therefore, I will not repeat them.

Although the electromorphic system has been described as a PMOS transistor in the embodiment according to the present invention for convenience of illustration, the present invention is not limited thereto. In other words, the transistor can also be formed as an NMOS transistor.

In an embodiment of the present invention, the organic light emitting diode OLED may generate red light, green light, and blue light corresponding to a current amount supplied from the driving transistor, or may correspond to a current amount supplied from the self-driving transistor. And produce white light. In the case where the organic light emitting diode OLED generates white light, a color image is achieved using a separate color filter or the like.

In summary, an organic light emitting display includes: a plurality of pixels arranged in a matrix form at intersections of a plurality of data lines, a plurality of scan lines, and a plurality of power lines. Each pixel typically includes an organic light emitting diode, two or more transistors, and one or more capacitors, the transistors including a drive transistor.

To achieve a 3D image, the organic light emitting display includes four frames during a period of 16.6 milliseconds (ms). A left image is displayed in one of the four frames, and a right image is displayed in one of the four frames. In addition, a black image is displayed in one of the four frames and the fourth frame.

In a shutter glass, a left lens receives light during a first frame and a right lens receives light during a third frame. In this case, the user wearing the shutter glasses will recognize that one of the images supplied via the shutter glasses is a 3D image. While the black image is displayed during the second frame and the fourth frame, the left lens and the right lens switch from receiving light to not receiving light or from receiving light to receiving light, thereby preventing crosstalk.

However, in the prior art organic light emitting display, four frames are included in a period of 16.6 milliseconds, and therefore, the organic light emitting display is driven at a driving frequency of 240 Hz. In the case where the organic light emitting display is driven at a high frequency, the power consumption of the organic light emitting display is increased, and the stability of the organic light emitting display is lowered. In addition, the manufacturing cost of the organic light emitting display increases. Since the black image is displayed during the second frame and the fourth frame, it is used to indicate that the peak current of a gray scale is increased, and thus the service life of the organic light emitting diode is shortened.

In the pixel according to an embodiment of the present invention and the organic light emitting display using the pixel, the pixels emit light, and the data signals can be charged synchronously (for example, simultaneously). Therefore, the organic light emitting display is driven at a low frequency, thereby achieving a 3D image. In addition, before the data signal is supplied, the driving transistor included in each pixel is initialized in an on-bias state, thereby displaying a uniform image.

Various example embodiments have been disclosed herein, and are not intended to be limiting. In certain instances, features, characteristics, and/or components set forth in connection with a particular embodiment can be used alone, as understood by those of ordinary skill in the art prior to the application of the present application. Or may be used in combination with the features, characteristics, and/or elements set forth in connection with the other embodiments. Therefore, it will be understood by those skilled in the art that various changes in the form and details may be made without departing from the spirit and scope of the invention.

142‧‧ ‧ pixels

144‧‧‧ pixel circuit

146‧‧‧First drive

148‧‧‧second drive

C1, C2‧‧‧ first capacitor, second capacitor

CL1‧‧‧ first control line

CL2‧‧‧Second control line

Dm‧‧‧ data line

E‧‧‧Lighting control line

ELVDD‧‧‧First power supply

ELVSS‧‧‧second power supply

M1~M9‧‧‧First transistor ~ ninth transistor

N1~N4‧‧‧first node~fourth node

OLED‧‧ Organic Light Emitting Diode

Sn‧‧ scan line

Vint‧‧‧Initial power supply

Claims (39)

A pixel includes: an organic light emitting diode; a second driver for controlling a current amount supplied from a first power source to the organic light emitting diode, the current amount corresponding to a pre-data signal; a first driver for storing a current data signal from a data line and supplying the previous data signal to the second driver, wherein the second driver comprises: a sixth transistor coupled to an initialization power source ( And a first node coupled to a gate of a first transistor, the sixth transistor being configured to be turned on when a first control signal is supplied; and a first a seventh transistor coupled between the first power source and a second node, the second node being coupled to the first driver and the second driver, the seventh transistor being configured to be Conducted when supplied. The pixel of claim 1, wherein the initialization power source has a voltage lower than a voltage supplied to one of the data signals of the data line. The pixel of claim 1, wherein the first driver comprises: a second transistor coupled between the data line and a third node, the second transistor being configured to be supplied with a scan signal Turning on to a scan line; a third transistor coupled to the third node and the second node The third transistor is configured to be turned on when a second control signal is supplied; and a second capacitor is coupled between the third node and the initialization power source. The pixel of claim 3, wherein the third transistor and the sixth transistor have a turn-on period that does not overlap each other. The pixel of claim 3, wherein the second transistor has an on period that does not overlap with an on period of the third transistor and the sixth transistor. The pixel of claim 1, wherein the second driver comprises: an eighth transistor coupled between the first power source and the second node, the second node coupled to one of the first transistors a first electrode, the eighth transistor being configured to be turned off when an illumination control signal is supplied, and being turned on when an illumination control signal is not supplied; a fifth transistor coupled to the first node and the first Between one of the second electrodes of a transistor, the fifth transistor is configured to be turned on when a second control signal is supplied; a ninth transistor coupled to the second electrode of the first transistor and the Between one of the anodes of the organic light-emitting diode, the ninth transistor is configured to be turned off when the light-emission control signal is supplied, and turned on when the light-emission control signal is not supplied; and a first capacitor coupled to The first node is between the first power source. The pixel according to claim 6, wherein the eighth transistor has one of The on period does not overlap with the on period of the fifth transistor and the sixth transistor. The pixel according to claim 6, wherein the fifth transistor and the sixth transistor have a conduction period that does not overlap each other. The pixel of claim 6, wherein the second driver further comprises: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured to It is turned on when the first control signal is supplied. The pixel of claim 6, wherein the second driver further comprises: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured to It is turned on when the second control signal is supplied. The pixel of claim 6, wherein the second driver further comprises: a fourth transistor coupled between the anode of the organic light emitting diode and a second control line, the second control signal being Supply to the second control line, the fourth transistor having a gate coupled to the second control line. The pixel of claim 6, wherein the second driver further comprises a photodiode, the photodiode being coupled in parallel to the first capacitor between the first node and the first power source. The pixel of claim 12, wherein the photodiode is configured to control one of the voltages at the first node, the increment corresponding to a brightness of the organic light emitting diode. The pixel of claim 12, wherein the photodiode is configured to control the first node in proportion to a brightness of one of the organic light emitting diodes One of the voltage increments. The pixel of claim 6, wherein the second driver further comprises: a third capacitor coupled between the anode of the organic light emitting diode and the second node. An organic light emitting display comprising: a control driver for supplying a first control signal to a first control line during a first period of a frame, and during a second period of one of the frames Supplying a second control signal to a second control line; a scan driver for supplying an illumination control signal to an illumination control during the first period, the second period, and the third period of the frame a line, and progressively supplying a scan signal to the plurality of scan lines during a fourth period of one of the frames; a data driver for supplying the scan signal in synchronization with the scan signal during the fourth period of the frame a data signal to a plurality of data lines; and a plurality of pixels located in an area defined by the scan lines and the data lines, the pixels being used to store a current data during one of the pixel illumination periods The signal, the light emitted by the pixels corresponds to a previous data signal; wherein the first period, the second period, the third period, and the fourth period do not overlap each other. The OLED display of claim 16, wherein the pre-data signal is a data signal supplied in a pre-frame, and the current information is The number is the data signal supplied in a current frame. The OLED display of claim 16, wherein the scan driver is configured to simultaneously supply the scan signal to the scan lines during the third period. The OLED display of claim 16, wherein the data driver is configured to supply a reset voltage to the data lines during the third period. The OLED display of claim 19, wherein the reset voltage is set to be one of voltages within a voltage range of the data signal. The OLED display of claim 16, wherein each of the pixels is configured to control a current flowing from a first power source to a second power source via an organic light emitting diode, the current amount corresponding to the previous data Signal. The OLED display of claim 21, wherein the first power source is set to a first voltage during the fourth period, and is set to be different from the first period during the first period to the third period One of the voltages of the second voltage. The OLED display of claim 22, wherein the second voltage is a voltage lower than the first voltage. The OLED display of claim 16, wherein each of the pixels comprises: an organic light emitting diode; and a second driver for supplying a current to the organic light emitting diode according to a first power source The amount of current corresponds to the previous data signal; a first driver is configured to store the current data signal and supply the previous data signal to the second driver. The OLED display of claim 24, wherein the first driver comprises: a second transistor coupled between one of the data lines and a third node, the second transistor being Configuring to be turned on when a scan signal is supplied to one of the scan lines; a third transistor coupled between the third node and a second node, the second node being coupled to the a first driver and the second driver, the third transistor being configured to be turned on when the second control signal is supplied; and a second capacitor coupled between the third node and an initialization power source. The OLED display of claim 24, wherein the second driver comprises: a first transistor having a first electrode coupled to the first power source via a second node, the second node being commonly coupled to the a first driver and the second driver, the first transistor has a gate coupled to a first node; a fifth transistor coupled to the second electrode of the first transistor and the first node The fifth transistor is configured to be turned on when the second control signal is supplied; a sixth transistor coupled to the first node and an initializing Between the sources, the sixth transistor is configured to be turned on when the first control signal is supplied; a seventh transistor coupled between the second node and the first power source, the seventh transistor being configured Turning on when the first control signal is supplied; an eighth transistor coupled between the second node and the first power source, the eighth transistor being configured to turn off when the illumination control signal is supplied And turning on when the light emission control signal is not supplied; and a ninth transistor coupled between the second electrode of the first transistor and an anode of the organic light emitting diode, the ninth transistor It is configured to turn off when the illumination control signal is supplied, and to turn on when the illumination control signal is not supplied. The OLED display of claim 26, wherein the initialization power source is set to be lower than a voltage of the data signal. The OLED display of claim 26, wherein the second driver further comprises: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured The conduction is turned on when the first control signal is supplied. The OLED display of claim 26, wherein the second driver further comprises: a fourth transistor coupled between the anode of the organic light emitting diode and the initialization power source, the fourth transistor being configured The conduction is turned on when the second control signal is supplied. The organic light emitting display of claim 26, wherein the second driver The device further includes a fourth transistor between the anode of the organic light emitting diode and the second control line, the fourth transistor having a gate coupled to the second control line. The OLED display of claim 26, wherein the second driver further comprises a photodiode, the photodiode being coupled in parallel to the first capacitor between the first node and the first power source. The OLED display of claim 31, wherein the photodiode is configured to control one of the voltages at the first node, the increment corresponding to a brightness of the organic light emitting diode. The organic light emitting display according to claim 31, wherein the photodiode is configured to control one of the voltages at one of the first nodes in increments of a brightness of one of the organic light emitting diodes. The OLED display of claim 26, wherein the second driver further comprises: a third capacitor coupled between the anode of the organic light emitting diode and the second node. A pixel includes: an organic light emitting diode; a second driver for controlling a current amount supplied from a first power source to the organic light emitting diode, the current amount corresponding to a pre-data signal; a first driver for storing a current data signal from a data line and supplying the previous data signal to the second driver, wherein the second driver comprises: a fourth transistor coupled to the organic light emitting diode One of the polar bodies Between the pole and an initial power source, the fourth transistor is configured to be turned on when a first control signal is supplied; and a seventh transistor is coupled between the first power source and a second node, the first Two nodes are commonly coupled to the first driver and the second driver, the seventh transistor being configured to conduct when the first control signal is supplied. The pixel of claim 35, wherein the first driver comprises: a second transistor coupled between the data line and a third node, the second transistor being configured to be supplied with a scan signal Turning on to a scan line; a third transistor coupled between the third node and the second node, the third transistor being configured to be turned on when a second control signal is supplied; and a second A capacitor coupled between the third node and the initialization power source. The pixel of claim 35, wherein the second driver comprises: a fifth transistor coupled between a first node and a second electrode of a first transistor, the first node coupled to the pixel a gate of the first transistor, the fifth transistor being configured to be turned on when a second control signal is supplied; a sixth transistor coupled between the initialization power source and the first node, the sixth The transistor is configured to be turned on when the first control signal is supplied; an eighth transistor coupled to the first power source and the second node The second node is coupled to one of the first electrodes of the first transistor, the eighth transistor being configured to be turned off when an illumination control signal is supplied, and to be turned on when an illumination control signal is not supplied a ninth transistor coupled between the second electrode of the first transistor and the anode of the organic light emitting diode, the ninth transistor being configured to be turned off when the light emission control signal is supplied And conducting when the illumination control signal is not supplied; and a first capacitor coupled between the first node and the first power source. The pixel of claim 37, wherein the eighth transistor has an on period that does not overlap with an on period of the fifth transistor and the sixth transistor. The pixel of claim 37, wherein the fifth transistor and the sixth transistor have a conduction period that does not overlap each other.