KR20160058574A - Organic light emmitting diode display device and driving method thereof - Google Patents

Abstract

The present invention relates to an organic electroluminescence display device. Especially, the present invention relates to an organic light emitting diode display device which corrects in real time the deterioration of a driving transistor in an external correction method, and a driving method thereof. According to the embodiment of the present invention, the gate-source voltage of the driving transistor is maintained with a constant state. A constant current sensing method for sensing a current flowing through it is applied. Thereby, the sensing time in the organic electroluminescence display device of an external correction method is rapidly reduced so that real-time correction can be implemented.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting display device and an organic light emitting display device having the same,

The present invention relates to an organic light emitting display device, and more particularly, to a high-resolution organic light emitting display device and a driving method thereof that compensate deterioration of a driving transistor in an external compensation scheme in real time.

A flat panel display for replacing a conventional cathode ray tube display device includes a liquid crystal display, a field emission display, a plasma display panel (PDP) And an organic light-emitting diode (OLED) display.

In particular, organic light emitting diodes (OLEDs) provided in organic light emitting display devices have a high luminance and a low operating voltage, and have a self-luminous type that emits light by themselves. Therefore, the organic light emitting diode has a large contrast ratio, . In addition, the response time is as small as several microseconds (μs), and the moving image is easy to implement, and there is no limitation of the viewing angle, and it is stable even at a low temperature.

FIG. 1 is an equivalent circuit diagram of one pixel of a conventional organic light emitting display. Referring to FIG.

As shown in the figure, the organic light emitting display includes a display panel in which a plurality of pixels PX are defined. In the display panel, a plurality of scan lines SL and data lines DL are formed in an intersecting manner, One pixel (PX) is defined at the point.

The pixel PX includes an organic light emitting diode OLED receiving a ground voltage ELVSS and a switching transistor STFT for applying a data voltage Vdata to the first node N1 corresponding to the scan signal Vscan. A driving transistor DTFT which receives the driving voltage ELVDD and applies a drain-source current according to a voltage applied to the first node N1 to the organic light emitting diode OLED, And a capacitor C1 for holding a voltage applied to the gate electrode of the transistor Q1 for one frame.

In the organic light emitting display having such a structure, in particular, the driving transistor (DTFT) controls the amount of current flowing in the organic light emitting diode (OLED) to display the gradation of the image, and plays an important role in image quality.

However, unlike the switching transistor, the driving transistor (DTFT) is continuously supplied with the DC voltage. As the deterioration progresses, the threshold voltage (Vth) varies.

In order to solve this problem, a structure for compensating the threshold voltage characteristic of the driving transistor inside or outside the panel has been proposed. In addition, since a plurality of transistors are further included in the pixel, the pixel structure is complicated and the aperture ratio is low. In addition, the internal compensation method includes an external sensing means and a reference wiring connected to the sensing means, An external compensation method for sensing the threshold voltage Vth of the DTFT and reflecting the result to the data voltage is widely used.

However, the conventional external compensation method is a source follow method in which the source electrode of the driving transistor DTFT at the time of threshold voltage sensing performs the post-wait sensing until the voltage level reaches Vdata-Vth, Is about 8000 microseconds, and it takes a long time to compensate in real time.

Accordingly, since the high resolution (4096 × 2160 or more) organic light emitting display device to which the conventional external compensation method is applied does not perform real time threshold voltage compensation, the afterimage due to deterioration in driving the display device and the luminance unevenness increase Image quality degradation occurs.

In addition, since the real-time compensation is not performed, deterioration is accelerated due to temperature rise during driving of the organic light emitting display, which is a main cause of shortening the lifetime of the display panel.

It is an object of the present invention to provide an organic light emitting display device that compensates a threshold voltage of a driving transistor in real time while applying an external compensation method to a high resolution display device and a driving method thereof I have to.

In order to achieve the above object, an organic light emitting display according to a preferred embodiment of the present invention includes a display panel including a plurality of pixels including a driving transistor and an organic light emitting diode, And a data driver for supplying a data voltage corresponding to the image data to the pixel, wherein the data driver senses the driving transistor in real time to generate sensing data on an element characteristic including an electron mobility (?) Component And a sensing unit for outputting a sensing signal.

And a timing controller for controlling the scan driver and the data driver to generate compensation data corresponding to the threshold voltage variation amount ?? and to reflect the compensation data on the video data, A threshold voltage compensating unit for calculating a threshold voltage variation ?? of the driving transistor is built in, and compensation for deterioration of the driving transistor can be performed in real time.

The organic electroluminescent display device and the driving method thereof according to the embodiment of the present invention apply the constant current sensing method of maintaining the gate-source voltage of the driving transistor to a constant state and sensing the current flowing therethrough, Time can be dramatically reduced to achieve real-time compensation.

Accordingly, during the driving of the organic light emitting display, it is possible to minimize the occurrence of afterimages due to deterioration and to improve the luminance uniformity, and also to extend the life of the display panel.

FIG. 1 is an equivalent circuit diagram of one pixel of a conventional organic light emitting display. Referring to FIG.
2 is a block diagram of an overall structure of an organic light emitting display according to an exemplary embodiment of the present invention.
3 is an equivalent circuit diagram illustrating the structure of one pixel of an organic light emitting display according to an exemplary embodiment of the present invention.
4 illustrates a timing controller including a threshold voltage compensator of an organic light emitting display according to an exemplary embodiment of the present invention.
5 is a diagram illustrating a method of driving an organic light emitting display according to an exemplary embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the case where the word 'includes', 'includes', 'have', 'to be performed', etc. are used in the present specification, other parts may be added as long as '~ only' is not used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, an organic light emitting display device and a driving method thereof according to a preferred embodiment of the present invention will be described with reference to the drawings.

2 is a block diagram of an overall structure of an organic light emitting display according to an exemplary embodiment of the present invention.

2, the organic light emitting display device of the present invention includes a display panel 100 including a plurality of pixels PX including a driving transistor and an organic light emitting diode, A scan driver 110, a data driver 120 for supplying a data voltage Vdata corresponding to the image data RGB to the pixel PX, a data driver 120 for sensing the drive transistor in real time, A threshold voltage compensator 140 for calculating a threshold voltage variation ?? of the driving transistor based on the sensing data, a data driver 140 for driving the data driver 140, And generates a compensation data corresponding to the threshold voltage variation amount? To reflect the compensation data on the video data.

A plurality of first scan lines SL1, a second scan lines SL2, a data line DL and a reference line RL are formed on a glass substrate or a plastic substrate so as to intersect with each other, A plurality of pixels PX corresponding to red, green, blue and white are formed at the intersections of the first scan lines SL1 and SL2 and the data lines DL.

The plurality of pixels PX are connected to a reference wiring RL to which a reference voltage Vref for sensing an element characteristic including the electron mobility α is applied and are connected to the display panel 100 And is connected to various wirings for supplying the formed power supply voltage ELVDD and the ground voltage ELVSS.

In addition, the plurality of pixels PX may each include at least an organic light emitting diode, a first capacitor, a first and a second switching transistor, and a driving transistor. Here, the organic light emitting diode may include a first electrode (hole injection electrode), an organic compound layer, and a second electrode (electron injection electrode)

The first and second scan lines SL1 and SL2 are connected to the scan driver 110 to apply the first and second scan signals Vscan1 and Vscan2 to the pixel PX and the reference line RL, (130) to apply the reference voltage (Vref) to the pixel (PX).

 The scan driver 110 applies the first and second scan signals Vscan1 and Vscan2 to the respective pixels PX in units of one horizontal line in response to the scan control signal SCS from the timing controller 150. [ The scan driver 110 may be implemented as a conventional shift register.

The data driver 120 receives the image data RGB of the digital waveform applied from the timing controller 150 and outputs the image data RGB to the gate terminal of the driving transistor of the pixel PX corresponding to the gray- And the data voltage Vdata is applied to each pixel PX through the data line DL in accordance with the data control signal DCS.

The sensing unit 130 senses an element characteristic including an electron mobility (?) Component of the driving transistor in real time at a specified point in time during driving of the organic light emitting display, and transmits the sensed data to the threshold voltage compensating unit 140 .

Here, the device characteristic sensed by the sensing unit 130 includes the electron mobility? Of the driving transistor. Conventionally, the threshold voltage (Vth) of the driving transistor is sensed by a voltage follow method and the variation (?) Is calculated. However, according to this method, about 8000 μs is obtained for one vertical line It is difficult to perform the sensing process in real time while driving the organic light emitting display device.

Therefore, in the present invention, the gate-source voltage of the driving transistor is fixed at a constant current to sense an element characteristic including the electron mobility (?), And based on a current or voltage sensing result through an algorithm described later And the threshold voltage variation amount DELTA phi is derived.

The constant current is a method of fixing the gate-source voltage of the transistor to which the electron mobility is to be sensed at a predetermined level and sensing the amount of current flowing through the transistor or a voltage corresponding thereto, Lt; RTI ID = 0.0 > s. ≪ / RTI > Therefore, a sensing process can be performed at a blank time between each frame for displaying an image, and real-time sensing is possible.

The sensing data ss_data by the sensing unit 130 may include first and second sensing data ss_data1 and ss_data2 and the first and second sensing data may include first and second data voltages VdataA, and VdataB, and a reference voltage Vref to the pixel PX. Here, the first and second data voltages VdataA and VdataB are required to remove the electron mobility (?) Component in the device characteristics of the driving transistor and have different voltage levels and are not limited to specific values At least two voltages should be set to have values larger than the reference voltage Vref. A detailed description of a method of generating the first and second sensing data ss_data1 and ss_data2 by the sensing unit 130 will be described later.

The sensing data ss_data generated by the sensing unit 130 is transmitted to the threshold voltage compensating unit 140.

The threshold voltage compensating unit 140 receives the sensing data ss_data for the device characteristic including the electron mobility of the driving transistor from the sensing unit 130, And the threshold voltage variation amount [Delta] [phi] is derived. The structure of the threshold voltage compensator 140 will be described later in detail.

The threshold voltage compensator 140 and the sensing unit 130 may be embedded in the timing controller 150 and the data driver 120 as circuit logic or may be implemented as separate ICs, It is possible.

The timing controller 150 generates a control signal such as a scan control signal SCS and a data control signal DCS by receiving a timing signal such as a clock signal and a vertical and horizontal synchronization signal from an external system The image data RGB can be processed by the data driver 120 and the image data RGB can be processed by the image data RGB, And outputs it.

According to such a structure, the organic light emitting display device of the present invention senses an element characteristic including the electron mobility (?) Rather than the threshold voltage (Vth) characteristic of the driving transistor in real time and, based on the sensing result, The threshold voltage sensing and compensation process of the real time driving transistor can be performed by generating the compensation data by deriving the variation amount [Delta] [phi].

Hereinafter, a pixel structure of an organic light emitting display device and a driving method thereof according to an embodiment of the present invention will be described with reference to the drawings.

3 is an equivalent circuit diagram illustrating the structure of one pixel of an organic light emitting display according to an exemplary embodiment of the present invention.

3, one pixel PX of the organic light emitting display according to the present invention includes an organic light emitting diode OLED, a gate terminal connected to the first node N1, a source terminal and a drain terminal, A driving transistor DTFT connected to the anode terminal and the power source voltage terminal VDD of the light emitting diode OLED to supply the organic light emitting diode OLED current, a gate terminal connected to the first scan line SL1, A source and a drain terminal of which are connected to the data line DL and the first node N1 to apply a data voltage Vdata to the first node N1 in accordance with the first scan signal Vscan1, And a gate terminal is connected to the second scan line SL2 and the source and drain terminals are connected to the reference line RL and the second node N2 respectively so that the reference voltage Vref is applied to the second node N2 , And the current flowing through the driving transistor DTFT according to the second scan signal Vscan2 A first capacitor C1 connected between the gate and the source of the driving transistor DTFT and a second capacitor connected between the reference wiring RL and the reference wiring RL, And a second capacitor C2 for storing a voltage corresponding to the potential of the second node N2.

A method of sensing the electron mobility (?) Of a driving transistor in a constant current mode in an organic light emitting display device having a pixel PX of such a structure will be described. First, first and second scan signals Vscan1 and Vscan2 Is applied to the first and second scan lines SL1 and SL2 to turn on the first and second switching transistors STFT1 and STFT2 to turn on any first The data voltage VdataA is charged and the second node N2 is charged with the reference voltage Vref.

Then, the first scan signal Vscan2 of a low level is applied to turn off the first switching transistor STFT1. Accordingly, the first node N1 is in a floating state, and the reference voltage Vref is maintained in the second node N2, so that the first node N1 through the first capacitor C1 And boosted by VdataA + Vref. At this time, the current I _A can be obtained by sensing the current flowing through the reference wiring RL.

Then, the first and second switching transistors STFT1 and STFT2 are applied to the first and second scan lines SL1 and SL2 by applying first and second scan signals Vscan1 and Vscan2 of high level in the same manner as described above, The first node N1 is charged with the second data voltage VdataB for sensing and the second node N2 is charged with the reference voltage Vref. The first node N1 is charged with VdataA + Vref, and then the current I _B is sensed at this time.

On the other hand, the equation for the current (I) flowing to the reference wiring through the driving transistor is expressed by the following equation (1).

In the above equation (1), μ and C are constant values as a function of the electron mobility and the parasitic capacitance of the driving transistor, W is the channel width, L is the channel length, Vgs is the gate-source voltage and Vth is the threshold voltage.

In Equation (1), conversion into an equation for the electron mobility (?) Is expressed as Equation (2).

Here, k is a constant value, and? And? 'Are the initial threshold voltage of the driving transistor and the threshold voltage at the time of deterioration, respectively, and ?? denotes a threshold voltage variation.

When the equations for the electron mobility? In the equation (2) are substituted for the currents I _A and I _B , respectively, the following equation (3) is derived.

Then, conversion into the equation (I _A / I _B ) for the ratio of the currents I _A and I _B results in the following equation (5).

를 I_M으로 치환하고, 문턱전압 변동량(ΔΦ)의 식으로 변환하면, 다음의 수학식 5와 같다. In Equation (4) above, the power value

Is replaced with I _M and converted into the expression of the threshold voltage fluctuation amount (?), The following equation (5) is obtained.

The threshold voltage variation ?? of the driving transistor can be calculated according to Equation (5).

In the above embodiment, an example of a current sensing method of sensing the currents I _A and I _B flowing through the driving transistor by the first and second data voltages VdataA and VdataB to calculate the threshold voltage variation amount? The voltage sensing method of sensing the voltage variation amount applied to the driving transistor and obtaining the threshold voltage variation amount ?? can also be applied.

Specifically, the current I flowing through the driving transistor according to the amount of change (? V) of the voltage applied to the driving transistor having the parasitic capacitance C for a certain time (? T) is expressed by the following equation.

According to Equation (6), the voltage variation amounts? VA and? VB of the driving transistor when the first and second data voltages VdataA and VdataB are applied to the driving transistor are proportional to the currents I _A and I _B , And sensing the voltage charged in the second capacitor connected to the reference line RL.

The equation (6) can be transformed into the equation relating to I _M.

Therefore, by substituting I _M in Equation (7) into Equation (5), it is possible to obtain the threshold voltage variation (?) Of the driving transistor.

Hereinafter, a structure of a timing control unit and a threshold voltage compensator included in an organic light emitting display according to an embodiment of the present invention will be described with reference to the drawings.

4 illustrates a timing controller including a threshold voltage compensator of an organic light emitting display according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the timing controller 150 of the organic light emitting display of the present invention includes a control signal compensator 151 for generating a control signal for controlling the sensing unit 130, a threshold voltage variation? A compensation data compensating unit 152 for compensating the compensated data by receiving the compensation data, an image data processor 156 for reflecting the compensation data to the image data, a memory unit 141 for storing the first and second sensing data, And an operation unit 145 for removing the electron mobility (?) Component and calculating a threshold voltage variation amount (?) Component through calculation of the first and second sensing data stored in the memory unit 141.

The control signal generating unit 151 receives timing signals such as a data enable signal DE, a horizontal synchronizing signal Hsync and a vertical synchronizing signal Vsync associated with the driving of the display device from an external system (not shown) And generates control signals SCS, DCS, and SC of the driving unit (110 and 120 of FIG. 2) and the sensing unit 130. In particular, the control signal generation unit 151 applies the sensing control signal SC to the sensing unit 130 to generate first and second sensing data for each pixel during the blank period during driving of the organic light emitting display device And supplies it to the threshold voltage compensation unit 140. The compensation data generation unit 152 receives the threshold voltage variation ?? calculated by the threshold voltage control unit 140 and generates compensation data corresponding thereto. The compensation data reflects the degree of shift of the threshold voltage according to the deterioration of the driving transistor in the image data (RGB) according to the variation amount of the threshold voltage [Delta] [phi]. The compensation data generation section 152 generates the compensation data And may include a predetermined LUT that adjusts the data value.

The image data processing unit 156 converts the image data (RGB) applied from the external system into a form that can be processed by the data driver (120 in FIG. 2), and simultaneously stores the compensation data input from the compensation data generating unit 152 And applies it to image data.

The threshold voltage compensation unit 140 may include a memory unit 141 for storing sensing data and an operation unit 145 for calculating a threshold voltage variation amount ?? using the stored data using the algorithm of the present invention .

The memory unit 141 stores the first sensing data ss_data1 and the second sensing data ss_data1 input from the sensing unit 130, respectively. The first and second sensing data ss_data1 and ss_data1 may be stored in units of one screen, that is, one frame.

The operation unit 145 operates the first and second sensing data ss_data1 and ss_data1 stored in the memory unit 141 according to Equation 5 to generate a threshold voltage variation amount? (152).

According to this structure, the timing controller 150 according to the embodiment of the present invention includes the threshold voltage compensator 140, and uses the threshold voltage variation ?? which is generated according to the result of sensing by the constant current method It is possible to compensate the threshold voltage of the driving transistor in real time and to solve the image degradation problem such as afterimage and luminance unevenness.

Hereinafter, a driving method of an organic light emitting display according to an embodiment of the present invention will be described with reference to the drawings.

5 is a diagram illustrating a method of driving an organic light emitting display according to an exemplary embodiment of the present invention.

5, a driving method of an organic light emitting display according to the present invention is a driving method of an organic light emitting display including a plurality of pixels including at least one driving transistor and an organic light emitting diode, Sensing the transistor in real time and outputting sensing data for an element characteristic including an electron mobility (?) Component (S110); calculating a threshold voltage variation ?? of the driving transistor based on the sensing data (S120) and generating a compensation data corresponding to a threshold voltage variation amount [Delta] [phi] of the driving transistor (S130).

In detail, the device characteristics including the electron mobility (?) Of the driving transistor of each pixel in the blank section during the driving of the organic light emitting display device through the sensing part are fixed by a constant current to a voltage applied to the terminal of the driving transistor , And outputs the sensing data to the operation unit (S110). At this time, the sensing process is performed twice using the first and second data voltages VdataA and VdataB of different arbitrary voltage levels, and thus, the sensing data also becomes two.

In particular, the first and second sensing data can be applied to any of a current sensing method for sensing a current flowing through a driving transistor and a voltage sensing method for sensing a variation amount of a voltage applied to the driving transistor. The first and second sensing data are stored in a predetermined memory.

Then, the operation unit calculates the threshold voltage variation ?? of the driving transistor through the algorithm corresponding to Equation (5) according to the first and second sensing data (S120).

Next, the compensation data generation unit of the timing control unit generates the compensation data corresponding to the LUT with reference to the LUT through the threshold voltage variation amount DELTA phi (S130).

The above steps S110 to S130 may be performed in the setting step for ensuring the luminance uniformity of the pre-shipment screen as well as the blank interval between frames during driving of the organic light emitting display as real-time compensation.

According to the above steps, the driving method of an organic light emitting display according to the present invention is a method of driving an organic light emitting display in which real-time sensing of device characteristics of a driving transistor is performed to derive a threshold voltage variation (? Threshold voltage sensing and compensation can be performed.

While a number of embodiments have been described in detail above, it should be construed as being illustrative of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

100: display panel 110: scan driver
120: Data driver 130:
140: threshold voltage compensation unit 150: timing control unit
PX: Pixels SL1 and SL2: Scan wiring
DL: Data wiring RL: Reference wiring
Vdata: data voltage Vscan1, Vscan2: scan signal
SCS: scan control signal DCS: data control signal
RGB ': (corrected) image data ss_data: Sensing data

Claims (9)

A display panel including a plurality of pixels each having a driving transistor and an organic light emitting diode;
A scan driver for conducting the pixel;
A data driver for supplying a data voltage corresponding to the image data to the pixel;
A sensing unit sensing the driving transistor in real time and outputting sensing data for an element characteristic including an electron mobility (?) Component;
A threshold voltage compensator for calculating a threshold voltage variation ?? of the driving transistor based on the sensing data; And
And generates a compensation data corresponding to the threshold voltage variation amount [Delta] [phi] and reflects the compensation data to the video data,
And an organic electroluminescent display device. The method according to claim 1,
Wherein the sensing data includes first and second sensing data,
The sensing unit includes:
Wherein the first and second sensing data are generated according to a current flowing in a state where a gate-source voltage of the driving transistor is fixed in a constant current manner. 3. The method of claim 2,
Wherein the timing control unit comprises:
A control signal compensating unit for generating a control signal for controlling the sensing unit;
A compensation data generation unit receiving the threshold voltage variation amount? To generate the compensation data;
And an image data processing unit for reflecting the compensation data to the image data,
Wherein the threshold voltage compensator comprises:
A memory unit for storing the first and second sensing data; And
(?) Component by computing the first and second sensing data stored in the memory unit, and deriving a threshold voltage variation amount?
And an organic light emitting diode (OLED). The method according to claim 1,
The pixel includes:
A first switching transistor having a gate terminal connected to the first scan line, a source and a drain terminal connected to the data line and a first node, respectively;
A second switching transistor having a gate terminal connected to a second scan wiring, a source and a drain terminal connected to a reference wiring and a second node, respectively;
A first capacitor having two terminals connected between a gate and a source of the driving transistor; And
And a second capacitor connected to the reference wiring,
The driving transistor includes:
A gate terminal is connected to the first node, and a source and a drain terminal are respectively connected to an anode terminal and a power source voltage terminal of the organic light emitting diode
And the organic electroluminescent display device. A driving method of an organic light emitting display including a plurality of pixels including at least one driving transistor and an organic light emitting diode,
Sensing the driving transistor in real time and outputting sensing data on an element characteristic including an electron mobility (?) Component;
Calculating a threshold voltage variation ?? of the driving transistor based on the sensing data; And
Generating compensating data corresponding to a threshold voltage variation amount ?? of the driving transistor
And driving the organic light emitting display device. 6. The method of claim 5,
Wherein the sensing data includes first and second sensing data,
Sensing the driving transistor in real time to generate sensing data for an element characteristic including an electron mobility (?) Component,
The first and second data voltages VdataA and VdataB and the reference voltage Vref are applied to the pixel and the gate-source voltage applied to the terminal of the driving transistor is fixed in a constant current manner Sensing the current or voltage by the driving transistor
Wherein the organic electroluminescent display device is a liquid crystal display device. The method according to claim 6,
The step of sensing the current or voltage by the driving transistor
Applying the first and second data voltages (Vdata_A, Vdata_B) to the pixel;
Applying a reference voltage (Vref) to a source of the driving transistor;
Floating the gate terminal of the driving transistor to bootstrap the voltage level to the voltage level of the source terminal; And
Sensing the voltage flowing through the driving transistor or the voltage of the capacitor connected to the reference wiring and outputting the first and second sensing data
And driving the organic light emitting display device. 8. The method of claim 7,
The threshold voltage variation amount [Delta] [phi]

(Where I _M is a power value for the ratio of the currents I _A and I _B flowing to the driving transistor by the first and second sensing data

) Or a power value for the ratio of the amount of voltage variation charged to the capacitor by the driving transistor (

))
And the driving voltage of the organic electroluminescent display device. 6. The method of claim 5,
Wherein the generating the sensing data and the compensation data comprises:
Is performed during a blank period between each frame of an image or when luminance uniformity is set before shipment of the display apparatus.

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