KR101877449B1 - Organic light elitting diode device and method of driving the same - Google Patents

Abstract

The present invention relates to an organic light emitting diode (OLED) display device and a driving method thereof, and may include a pixel structure capable of reducing data loss caused by data programming to improve data programming efficiency.

Description

Technical Field [0001] The present invention relates to an organic light emitting diode (OLED) display device,

The present invention relates to an organic light emitting diode (OLED) display device and a driving method thereof, and more particularly, to an organic light emitting diode display device including a pixel structure capable of reducing data loss caused by data programming, And a driving method thereof.

2. Description of the Related Art [0002] With the development of information society in recent years, demands for the display field have been increasing in various forms. In response to this demand, various flat panel display devices having characteristics such as thinning, light weight and low power consumption have been developed, A liquid crystal display device, a plasma display panel device, and an organic light emitting diode (OLED) device have been studied.

Organic Light Emitting Diode (OLED) devices are self-luminous display devices using organic compounds emitting light such as red (R), green (G), and blue (B) Panel and a drive circuit.

Therefore, unlike a liquid crystal display device, an organic light emitting diode display device does not require a separate light source.

As a result, since a backlight unit is not required, the manufacturing process is simple compared to a liquid crystal display device, and the advantage of being able to reduce manufacturing cost is attracting attention as a next generation flat panel display

In addition, the organic light emitting diode display device has advantages such as excellent viewing angle and contrast ratio as compared with the liquid crystal display device, low DC voltage driving capability, high response speed, strong external shock, and wide temperature range.

Particularly, in the active matrix type, a voltage for controlling a current applied to a pixel region is charged in a storage capacitor, and a voltage is maintained until a next frame signal is applied, Regardless of the number of gate wirings.

Therefore, in the active matrix system, even if a low current is applied, the same brightness is exhibited, which has advantages of low power consumption and large size.

FIG. 1 is a schematic view showing an equivalent circuit of a pixel region of a conventional organic light emitting diode display device.

1, a conventional organic light emitting diode display device is provided with a gate line GL and a data line DL which define a pixel region P intersecting with each other, A transistor Tsw, a driving transistor Tdr, a storage capacitor Cst, and a light emitting diode Del.

The switching transistor Tsw is connected to one end of the gate line GL, the data line DL, and the storage capacitor Cst.

The driving transistor Tdr is connected to one end of the storage capacitor Cst and the other end of the light emitting diode Del and the storage capacitor Cst.

At this time, the light emitting diode Del and the driving transistor Tdr are connected between the high potential wiring VDD and the low potential wiring VSS.

When the gate signal is supplied through the gate line GL and the switching transistor Tsw is turned on, the organic light emitting diode display device is driven through the data line DL. Is transferred to the driving transistor Tdr and the storage capacitor Cst.

When the driving transistor Tdr is turned on by a data signal, a current flows through the light emitting diode Del so that the light emitting diode Del emits light.

At this time, the intensity of light emitted by the light emitting diode Del is proportional to the amount of current flowing through the light emitting diode Del, and the amount of current flowing through the light emitting diode Del is proportional to the size of the data signal.

Accordingly, the organic light emitting diode display device displays different gradations by applying data signals of various sizes to each pixel region P, and as a result, can display an image.

The storage capacitor Cst holds the data signal for one frame to keep the amount of the current flowing through the light emitting diode Del constant and to maintain the gradation displayed by the light emitting diode Del constant .

On the other hand, unlike a liquid crystal display in which a transistor in a pixel region is turned on only for a relatively short time in a frame, the organic light emitting diode display device has a relatively long period of time The driving transistor Tdr can be easily deteriorated because the driving transistor Tdr is maintained in a turned-on state.

As a result, the threshold voltage (Vth) of the driving transistor Tdr is changed. The variation of the threshold voltage Vth of the driving transistor Tdr may adversely affect the image quality of the organic light emitting diode display device.

FIG. 2 is a graph showing a current-voltage (I-V) characteristic curve according to a threshold voltage variation of a driving transistor of a conventional organic light emitting diode display device. Ids is a current flowing between the drain electrode and the source electrode of the driving transistor, and Vgs is a voltage between the gate electrode and the source electrode of the driving transistor.

2, the driving transistor (Tdr in FIG. 1) has a first characteristic curve G1 at the beginning of the operation of the organic light emitting diode display, and as the operation of the organic light emitting diode display continues, And third characteristic curves G2 and G3, and the threshold voltage gradually increases (Vth1 <Vth2 <Vth3).

Such a change in the current-voltage characteristic curve of the driving transistor Tdr means that the current flowing between the drain electrode and the source electrode is different even if the same data signal is applied to the gate electrode.

For example, in the first to third characteristic curves G1, G2 and G3 of the driving transistor Tdr, the current flowing through the light emitting diode (Del in FIG. 1) decreases gradually with respect to the same data voltage Vdata I1 > I2 > I3), and accordingly the intensity of light emitted by the light emitting diode (Del in Fig.

As a result, the pixel region of the organic light emitting diode display device displays different gradations with respect to the same data signal, thereby deteriorating the image quality of the organic light emitting diode display device.

Therefore, development of a pixel structure of a new organic light emitting diode display device for compensating a threshold voltage variation due to deterioration of a driving transistor is required.

It is an object of the present invention to provide an organic light emitting diode display device including a pixel structure capable of improving a data programming efficiency by reducing a loss voltage generated in data programming .

According to an aspect of the present invention, there is provided an organic light emitting diode (OLED) display device including: a gate line and a data line crossing each other on a substrate; A switching transistor connected to the gate wiring and the data wiring and the first node; A first transistor connected to the sensing wiring and the high-potential voltage wiring and the second node; A second transistor connected to the initializing wiring and the reference voltage wiring and the second node; A third transistor connected to the initialization wiring and the initialization voltage wiring and a third node; A fourth transistor connected to the initialization wiring and high-potential voltage wiring and the first node; A first capacitor coupled between the first node and the third node; A second capacitor connected to the second node and the high potential voltage wiring; A third capacitor coupled between the second node and the third node; And a driving transistor and a light emitting diode connected between the high-potential voltage wiring and the low-potential voltage wiring.

Here, the first transistor may be turned on by a sensing signal to sense a threshold voltage of the driving transistor.

The second and third transistors may be turned on by an initialization signal to initialize the second node to a reference voltage and to initialize the third node to an initialization voltage.

Preferably, the fourth transistor is turned on by an initializing signal to initialize the first node to a high potential higher than a maximum value of the data signal.

The organic light emitting display device may further include a light emission control line and a light emission control transistor connected to the first node and the second node.

The light emission control transistor may be turned on by a light emission control signal to control the light emission timing of the light emitting diode.

According to an aspect of the present invention, there is provided a method of driving an OLED display device including a switching transistor, a driving transistor, first to fourth transistors, first to third capacitors, and a light emitting diode The method of driving an organic light emitting diode display device according to claim 1, wherein the first transistor is turned on by a sensing signal to sense a threshold voltage of the driving transistor. The second transistor and the third transistor are turned on by an initialization signal to initialize a second node to a reference voltage and initialize a third node to an initialization voltage; And the fourth transistor is turned on by the initialization signal to initialize the first node to a high potential higher than a maximum value of the data signal.

Here, the driving method of an organic light emitting diode display according to an embodiment of the present invention includes the steps of: storing a data signal transmitted through the switching transistor in the first capacitor; The driving transistor may be turned on by the data signal to control a current flowing through the light emitting diode.

The organic light emitting diode display according to an embodiment of the present invention further includes a light emission control transistor, wherein the light emission control transistor is turned on by a light emission control signal, and the data stored in the first capacitor And controlling the emission timing of the light emitting diode according to the signal transmitted to the driving transistor.

As described above, in the organic light emitting diode display device according to the present invention, the loss voltage generated when data programming is performed can be reduced.

As a result, the driving range of the driving transistor is increased and the contrast ratio can be improved.

In addition, even if a data voltage lower than the conventional one is used, the same luminance as the conventional one can be realized, and the power consumption of the organic light emitting diode display device can be reduced.

FIG. 1 is a schematic view showing an equivalent circuit of a pixel region of a conventional organic light emitting diode display device.
FIG. 2 is a graph showing a current-voltage (IV) characteristic curve according to a threshold voltage variation of a driving transistor of a conventional organic light emitting diode display device.
3 is a schematic view illustrating an organic light emitting diode display device according to a first embodiment of the present invention.
4 is a diagram schematically showing an equivalent circuit of a pixel region of an organic light emitting diode display device according to a first embodiment of the present invention.
5 is a timing diagram showing a plurality of control signals supplied to the organic light emitting diode display according to the first embodiment of the present invention.
6 is a diagram for describing a voltage change of a node A and a node B according to a data signal application in the organic light emitting diode display device according to the first embodiment of the present invention.
FIG. 7 is a diagram illustrating a voltage change of a node A and a node B of an equivalent circuit of a pixel region of an organic light emitting diode display device according to the first embodiment of the present invention.
8 is a view schematically showing an equivalent circuit of a pixel region of an organic light emitting diode display device according to a second embodiment of the present invention.
FIG. 9 is a diagram for explaining the voltage change of the node A and the node B in the initialization process in the organic light emitting diode display device according to the second embodiment of the present invention.
10 is a diagram for describing a voltage change of a node A and a node B according to a data signal application in the organic light emitting diode display device according to the second embodiment of the present invention.
11 is a diagram showing voltage changes of node A and node B of an equivalent circuit of a pixel region of an organic light emitting diode display device according to a second embodiment of the present invention.
12 and 13 are diagrams referred to explain the change of the data level and Ids.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic view of an active matrix type organic light emitting diode display device according to a first embodiment of the present invention. FIG. 4 is a cross-sectional view of a pixel region of the organic light emitting diode display device according to the first embodiment of the present invention. 1 is a diagram schematically showing an equivalent circuit.

3 and 4, the organic light emitting diode display 100 according to the first embodiment of the present invention includes a display panel 110 for displaying an image, a data driver 120, a gate driver 130 A timing controller 140 for controlling the driving timing of each of the data driver 120 and the gate driver 130, and the like.

The display panel 110 may include first to m-th gate lines GL1 to GLm and first to n-th data lines DL1 to DLn that define a plurality of pixel regions P intersecting with each other .

A plurality of sensing wirings SL and a plurality of initialization wirings IL and a plurality of light emission control wirings EL for supplying a control signal for controlling each pixel region P are parallel to the gate wirings GL As shown in FIG.

In each pixel region P, a switching transistor Tsw, a driving transistor Tdr, a light emission control transistor Tem, first to third transistors T1 to T3, and first to third capacitors C1 to C3 And a light emitting diode (Del) are formed.

Each of the pixel regions P has the same structure. Hereinafter, the first to m-th gate lines GL1 to GLm are referred to as gate lines GL, and the first to the n-th data lines DL1 to DLn are referred to as data The wiring DL will be described.

The gate electrode and the drain electrode of the switching transistor Tsw are connected to the gate wiring GL and the data wiring DL respectively and the source electrode of the switching transistor Tsw is connected to one end (node A) of the first capacitor C1 .

The switching transistor Tsw is turned on according to a gate signal supplied through the gate line GL and transmits a data signal supplied through the data line DL to the first capacitor C1 .

Here, the first capacitor C1 holds the data signal for one frame to keep the amount of the current flowing through the light emitting diode Del constant and to keep the gradation displayed by the light emitting diode Del constant Lt; / RTI &gt;

The gate electrode of the first transistor T1 is connected to the sensing wiring SL and the drain electrode and the source electrode of the first transistor T1 are connected to the high potential voltage line VDD and the source electrode of the second transistor T2, Lt; / RTI &gt;

The first transistor T1 is turned on according to a sensing signal supplied through the sensing line SL to sense a threshold voltage of the driving transistor Tdr.

The gate electrodes of the second transistor T2 and the third transistor T3 are connected to the initialization line IL respectively and the drain electrode and the source electrode of the second transistor T2 are connected to the reference voltage line Vref and the first And is connected to the source electrode of the transistor T1.

The drain electrode and the source electrode of the third transistor T3 are connected to the initialization voltage wiring Vint and the other end (node B) of the first capacitor C1, respectively.

The second transistor T2 and the third transistor T3 are turned on according to an initialization signal supplied via the initialization line IL and are supplied to the gate electrode N of the driving transistor Tdr, And initializes the node B.

At this time, the reason for initializing each node is to avoid influence of previous frame data.

The gate electrode of the emission control transistor Tem is connected to the emission control line EL and the drain electrode and the source electrode of the emission control transistor Tem are connected to one end of the first capacitor C1 And the source electrode of the second transistor T2.

The emission control transistor Tem is turned on according to the emission control signal supplied through the emission control line EL and transmits a data signal to the driving transistor Tdr to emit light It controls the timing.

The gate electrode and the drain electrode of the driving transistor Tdr are connected by the second capacitor C2 and the gate electrode and the source electrode of the driving transistor Tdr are connected by the third capacitor C3. The electrode is connected to the source electrode of the emission control transistor (Tem).

The driving transistor Tdr is turned on by a data signal stored in the first capacitor C1 to control a current flowing through the light emitting diode Del.

That is, when the driving transistor Tdr is turned on by a data signal, a current flows through the light emitting diode Del so that the light emitting diode Del emits light.

At this time, the intensity of light emitted by the light emitting diode Del is proportional to the amount of current flowing through the light emitting diode Del, and the amount of current flowing through the light emitting diode Del is proportional to the size of the data signal.

Accordingly, the organic light emitting diode display device displays different gradations by applying data signals of various sizes to each pixel region P, and as a result, can display an image.

The light emitting diode Del and the driving transistor Tdr are connected between the high potential wiring VDD and the low potential wiring VSS.

The data driver 120 may include at least one driver IC (not shown) for supplying a data signal to the display panel 110.

The data driver 120 generates a data signal using the converted video signal R / G / B and a plurality of data control signals transmitted from the timing controller 140, To the display panel (110).

The timing controller 140 receives a plurality of video signals and a plurality of control signals such as a vertical synchronization signal VSY, a horizontal synchronization signal HSY, and a data enable signal DE from a system SystEL, .

The timing control unit 140 can generate a plurality of data signals and supply the data signals to the respective driver ICs of the data driver 120.

The gate driver 130 generates a gate signal using a plurality of gate control signals transmitted from the timing controller 140 and controls the generated gate signal to be supplied to the display panel 110 through the gate line GL .

5 is a timing diagram showing a plurality of control signals supplied to the organic light emitting diode display according to the first embodiment of the present invention. Will be described with reference to FIG.

First, as shown in Fig. 5, a sensing signal is supplied to the first transistor T1 through the sensing wiring SL.

The first transistor T1 is turned on according to a sensing signal to sense a threshold voltage of the driving transistor Tdr.

The initialization signal is supplied to the second transistor T2 and the third transistor T3 through the initialization line IL and the second transistor T2 and the third transistor T3 are turned on according to the initialization signal. Thereby turning on the gate electrode (node N) and the node B of the driving transistor Tdr.

Then, a gate signal is supplied to the switching transistor Tsw through the gate line GL, and the switching transistor Tsw is turned on according to the gate signal and is supplied through the data line DL And transfers the data signal to the first capacitor C1.

Finally, a light emission control signal is supplied to the light emission control transistor Tem through the light emission control line EL, and the light emission control transistor Tem is turned on according to the light emission control signal to turn on the drive transistor Tdr As shown in FIG.

As a result, the emission timing of the light emitting diode Del is controlled.

FIG. 6 is a diagram for explaining a voltage change of a node A and a node B according to a data signal application in the organic light emitting diode display according to the first embodiment of the present invention. FIG. In the equivalent circuit of the pixel region of the organic light emitting diode display device according to the first embodiment of the present invention. Will be described with reference to Figs.

As shown in the figure, the first capacitor C1 is charged with the data signal of the previous frame at the previous time point when the data signal is applied, and the node B is initialized by the third transistor T3.

When a larger data signal is transferred to the node A by the switching transistor Tsw, the voltage of the node B is increased by the coupling of the capacitor COLED connected in series with the first capacitor C1. Here, the capacitor COLED may be an equivalent capacitor of the light emitting diode Del.

This increase in voltage at node B can be a loss of the programmable data signal.

In other words, as the voltage of the node B increases, the potential difference between the node A and the node B decreases, thereby reducing the size of the substantially programmable data signal that can be stored in the first capacitor. (Actual value = programmable data signal-loss)

As a result, even if the same data signal is applied, since the size of the substantially programmable data signal is reduced, the amount of light emitted by the light emitting diode Del decreases, which can affect image quality.

8 is a view schematically showing an equivalent circuit of a pixel region of an organic light emitting diode display device according to a second embodiment of the present invention.

8, the switching transistor Tsw, the driving transistor Tdr, the emission control transistor Tem, the first to fourth transistors T1 to T4, and the first to fourth transistors T1 to T4 are formed in the pixel region of the organic light emitting diode display device, The first to third capacitors C1 to C3 and the light emitting diode Del are formed.

Each of the pixel regions P has the same structure. Hereinafter, the first to m-th gate lines GL1 to GLm are referred to as gate lines GL, and the first to the n-th data lines DL1 to DLn are referred to as data The wiring DL will be described.

The gate electrode and the drain electrode of the switching transistor Tsw are connected to the gate wiring GL and the data wiring DL respectively and the source electrode of the switching transistor Tsw is connected to one end (node A) of the first capacitor C1 .

The switching transistor Tsw is turned on according to a gate signal supplied through the gate line GL and transmits a data signal supplied through the data line DL to the first capacitor C1 .

Here, the first capacitor C1 holds the data signal for one frame to keep the amount of the current flowing through the light emitting diode Del constant and to keep the gradation displayed by the light emitting diode Del constant Lt; / RTI &gt;

The gate electrode of the first transistor T1 is connected to the sensing wiring SL and the drain electrode and the source electrode of the first transistor T1 are connected to the high potential voltage line VDD and the source electrode of the second transistor T2, Lt; / RTI &gt;

The first transistor T1 is turned on according to a sensing signal supplied through the sensing line SL to sense a threshold voltage of the driving transistor Tdr.

The gate electrodes of the second transistor T2 and the third transistor T3 are connected to the initialization line IL respectively and the drain electrode and the source electrode of the second transistor T2 are connected to the reference voltage line Vref and the first And is connected to the source electrode of the transistor T1.

The drain electrode and the source electrode of the third transistor T3 are connected to the initialization voltage wiring Vint and the other end (node B) of the first capacitor C1, respectively.

The second transistor T2 and the third transistor T3 are turned on according to an initialization signal supplied via the initialization line IL and are supplied to the gate electrode N of the driving transistor Tdr, And initializes the node B.

The gate electrode of the fourth transistor T4 is connected to the initialization line IL and the drain electrode and the source electrode of the fourth transistor T4 are connected to the high potential wiring VDD and the first capacitor C1 (Node A).

The fourth transistor T4 is turned on by the initialization signal to initialize the first node to a high potential higher than the maximum value of the data signal. The high potential voltage may be, for example, 15V.

The gate electrode of the emission control transistor Tem is connected to the emission control line EL and the drain electrode and the source electrode of the emission control transistor Tem are connected to one end of the first capacitor C1 And the source electrode of the second transistor T2.

The emission control transistor Tem is turned on according to the emission control signal supplied through the emission control line EL to transmit a data signal to the emission diode Del, It controls the timing.

The gate electrode and the drain electrode of the driving transistor Tdr are connected by the second capacitor C2 and the gate electrode and the source electrode of the driving transistor Tdr are connected by the third capacitor C3. The electrode is connected to the source electrode of the emission control transistor (Tem).

The driving transistor Tdr is turned on by a data signal stored in the first capacitor C1 to control a current flowing through the light emitting diode Del.

At this time, the light emitting diode Del and the driving transistor Tdr are connected between the high potential wiring VDD and the low potential wiring VSS.

9 and 10 illustrate voltage changes of the node A and the node B according to the voltage change of the node A and the node B and the application of the data signal in the initialization process in the organic light emitting diode display device according to the second embodiment of the present invention And FIG. 11 is a diagram showing voltage changes of node A and node B of the equivalent circuit of the pixel region of the organic light emitting diode display device according to the second embodiment of the present invention.

9, when the fourth transistor T4 is turned on by an initialization signal, a high-potential voltage higher than the maximum value of the data signal is applied to the first node T4, The node is initialized to a high potential voltage.

10, when a data signal smaller than the high potential voltage is transferred to the node A by the switching transistor Tsw, the coupling between the first capacitor C1 and the capacitor COLED connected in series The voltage of the node B decreases. Here, the capacitor COLED may be an equivalent capacitor of the light emitting diode Del.

Such a voltage reduction of the node B can be a gain of the programmable data signal.

In other words, when the voltage of the node B decreases, the potential difference between the node A and the node B becomes large, and accordingly, the magnitude of the programmable data signal that can be stored in the first capacitor becomes large. (Actual value = programmable data signal + additional value)

Therefore, since the size of the substantially programmable data signal is increased, even if a small data signal is applied, the efficiency of data signal programming can be improved due to the same amount of light emission of the light emitting diode Del.

On the other hand, even when the data signal is applied by the switching transistor Tsw, the data signal is transferred to the driving transistor Tdr when the emission control transistor Tem is turned on.

Therefore, the initialization, the threshold voltage detection and the data voltage programming operate independently of each other, so that the data voltage can be programmed at any timing.

12 and 13 are diagrams for explaining the change of the data level and Ids. FIG. 12 shows the value of Ids according to the data level. FIG. 13 shows the value of the square root of Ids according to the data level. Fig.

Equation (1) is expressed as follows with respect to the current Ids flowing between the drain electrode and the source electrode of the driving transistor Tdr.

[Equation 1]

Here,? Is a constant determined by the structure and physical characteristics of the TFT, Vgs is the voltage between the gate electrode and the source electrode of the driving transistor, and Vth is the threshold voltage.

12 is a quadratic curve shape, and since the square root of Ids is proportional to the data level, Fig. 13 shows a linear shape.

As shown in FIGS. 12 and 13, it can be seen that the Ids value flowing at the same data level increases in the organic light emitting diode display according to the second embodiment of the present invention.

As a result, the driving range of the driving transistor is increased and the contrast ratio can be improved. In other words, even if the same data voltage is applied, the luminance may increase compared with the conventional one.

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

100: organic light emitting diode display device 110: display panel
120: Data driver 130: Gate driver
140:
Tsw: switching transistor Tdr: driving transistor
Tem: Emission control transistor Del: Light emitting diode

Claims (9)

A gate wiring and a data wiring formed on the substrate so as to cross each other;
A switching transistor connected to the gate wiring and the data wiring and the first node;
A first transistor connected to the sensing wiring and the high-potential voltage wiring and the second node;
A second transistor connected to the initializing wiring and the reference voltage wiring and the second node;
A third transistor connected to the initialization wiring and the initialization voltage wiring and a third node;
A fourth transistor connected to the initialization wiring and high-potential voltage wiring and the first node;
A first capacitor coupled between the first node and the third node;
A second capacitor connected to the second node and the high potential voltage wiring;
A third capacitor coupled between the second node and the third node;
A driving transistor connected between the high-potential voltage wiring and the low-potential voltage wiring,
And an organic light emitting diode (OLED) display device.
The method according to claim 1,
Wherein the first transistor is turned on by a sensing signal to sense a threshold voltage of the driving transistor.
The method according to claim 1,
Wherein the second transistor and the third transistor are turned on by an initialization signal to initialize the second node to a reference voltage and to initialize the third node to an initialization voltage, respectively.
The method according to claim 1,
Wherein the fourth transistor is turned on by an initialization signal to initialize the first node to a high potential voltage greater than a maximum value of the data signal.
The method according to claim 1,
And a light emitting control transistor connected to the first node and the second node.
6. The method of claim 5,
And the emission control transistor is turned on by the emission control signal to control the emission timing of the light emitting diode.
A method of driving an organic light emitting diode (OLED) display device including a switching transistor, a driving transistor, first to fourth transistors, first to third capacitors, and a light emitting diode,
Sensing the threshold voltage of the driving transistor by turning on the first transistor by a sensing signal;
The second transistor and the third transistor are turned on by an initialization signal to initialize a second node to a reference voltage and initialize a third node to an initialization voltage;
Wherein the fourth transistor is turned on by the initialization signal to initialize the first node to a high potential voltage greater than a maximum value of the data signal
And driving the organic light emitting diode.
8. The method of claim 7,
Storing a data signal transmitted through the switching transistor in the first capacitor;
The driving transistor being turned on by the data signal to control a current flowing in the light emitting diode
And driving the organic light emitting diode (OLED) display device.
9. The method of claim 8,
Further comprising a light emission control transistor,
Further comprising the step of controlling the light emission timing of the light emitting diode as the light emission control transistor is turned on by the light emission control signal and transmits the data signal stored in the first capacitor to the drive transistor A method of driving a light emitting diode display device.

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