KR20150064787A - Organic lighting emitting device and method for compensating degradation thereof - Google Patents

Abstract

The present invention relates to an organic lighting emitting device and a method for compensating degradation thereof. The organic lighting emitting device includes a display panel which includes at least two pixels arranged in the intersection regions of a data line and a gate line, and includes a reference line connected to one of two electrode in the at least two pixels, a data driving part which supplies data voltage to the display panel through the data line, a gate driving part which supplies a scan signal to the display panel through the gate line, and a timing controller which controls the driving timing of the data driving part and the gate driving part, and a compensation part which corrects the deterioration of an organic light emitting diode of the pixels based on the deterioration level of one of the at least two pixels sensed through the reference voltage line.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) display device and a method of compensating for deterioration thereof.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic light emitting display device for displaying an image and a deterioration compensation method thereof.

2. Description of the Related Art In recent years, an organic light emitting diode (OLED) display device that has been spotlighted as a display device has advantages of high response speed, high luminous efficiency, high luminance and wide viewing angle by using an organic light emitting diode (OLED)

Such an organic light emitting display device arranges pixels including an organic light emitting diode (OLED) in a matrix form, and controls the brightness of pixels selected by a scan signal according to the gradation of the data. In addition to the organic light emitting diode, each pixel of the organic light emitting display includes a data line and a gate line intersecting with each other, and a transistor and a storage capacitor having a connection structure.

However, such an organic light emitting display device has a problem that an image of a desired luminance can not be displayed due to deterioration of the organic light emitting diode (OLED).

In view of the foregoing, it is an object of the present invention to provide an organic light emitting diode (OLED) display device that compensates for deterioration of an organic light emitting diode (OLED) and displays an image with a desired brightness, and a method of compensating the deterioration thereof.

It is another object of the present invention to provide an organic light emitting display having a sensing and compensating function for a simple and compact pixel structure and a driving method thereof in providing an efficient sensing and compensating function for compensating pixel deterioration There is.

In order to accomplish the above object, in one aspect, the present invention provides a liquid crystal display device including at least two pixels arranged at intersecting regions of a data line and a gate line, each of the pixels including a plurality of pixels, A data driver for supplying a data voltage to the display panel through a data line, a gate driver for supplying a scan signal to the display panel through the gate line, and a timing controller for controlling driving timings of the data driver and the gate driver And a compensator that compensates deterioration of the organic light emitting diode of the two or more pixels based on the degree of deterioration of one of the two or more pixels sensed through the reference voltage line.

In another aspect, the present invention provides a method comprising sensing a threshold voltage of an organic light emitting diode of one of two or more pixels through a reference voltage line connected to one of two electrodes of each of two or more pixels, The deterioration degree of the organic light emitting diode of one pixel is calculated from the threshold voltage of the organic light emitting diode of one pixel sensed through the data line, and the data of one pixel estimated according to the degree of deterioration of the organic light emitting diode of the calculated one pixel The degradation of the organic light emitting diodes of the other pixels is compensated according to the data usage amount of other pixels estimated according to the comparison value between the actual data usage amount of one pixel and the estimated data usage amount And a compensation step of compensating the deterioration of the organic light emitting display device.

As described above, according to the present invention, there is an effect of providing an organic light emitting display device capable of displaying an image of a desired luminance by compensating for deterioration of the organic light emitting diode (OLED), and a method of compensating the deterioration thereof.

According to the present invention, there is provided an organic light emitting display device having a sensing and compensating function suitable for a simple and compact pixel structure and a driving method thereof, in order to provide an efficient sensing and compensating function for compensating pixel deterioration .

With these points, a high-quality display panel can be manufactured with a high yield.

These points will be more effective when applied to high resolution and large area display panels.

1 is an overall system configuration diagram of an organic light emitting diode display according to an exemplary embodiment.
2A and 2B are equivalent circuit diagrams for one pixel in the display panel of FIG.
3 is a plan view schematically showing a part of the display panel of Fig.
FIG. 4A illustrates an external compensation scheme (sensing unit and compensation unit) included in the OLED display of FIG. 1. Referring to FIG.
4B is a graph showing the characteristics of the organic light emitting diode of FIG.
5 is a diagram illustrating an implementation of an external compensation structure included in the OLED display of FIG.
6 is a detailed configuration diagram of an example of the compensation unit of FIG.
7 is a view for explaining external compensation by the compensation unit according to the example of FIG.
8 is a view for explaining a deterioration deviation of the organic light emitting diode depending on the position of the display panel.
Fig. 9 is a detailed configuration diagram of another example of the compensation unit of Fig. 4;
10 is a view for explaining external compensation by the compensation unit according to another example of FIG.
11 is a configuration diagram of the data driver of FIG. 1 for receiving the compensation data and driving the data line.
12 is a configuration diagram of the gate driver of FIG.
13 is a flowchart of a deterioration compensation method of a display apparatus according to another embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or "connected" through other components.

1 is an overall system configuration diagram of an organic light emitting diode display according to an exemplary embodiment.

Referring to FIG. 1, an OLED display 10 according to an exemplary embodiment includes a plurality of data lines (DL) formed in one direction and a plurality of gate lines A display panel 11 including a plurality of pixels (P: Pixel) arranged in each of intersections of lines GL (Gate Line), a data driver 12 for supplying a data voltage through the data lines, And a timing controller 14 for controlling the driving timing of the data driver 12 and the gate driver 13, and the like.

1, a plurality of data lines DL (1) to DL (4N) are formed in one direction on a display panel 11 and a plurality of data lines DL (1) to DL (4N) And a plurality of gate lines GL (1) to GL (M) are formed in the other direction. In this specification, for convenience of explanation, it is assumed that the number of data lines and gate lines formed on the display panel 11 is 4N and M, but the present invention is not limited thereto. Here, N and M are natural numbers of 1 or more. The number n used for identifying each data line in all 4N data lines is a natural number of 1 or more and 1/4 or less of the number of data lines (1? N? (4N / 4)).

In this display panel 11, 4N × M pixels (1) to 4N are arranged in an area where the 4N data lines DL (1) to DL (4N) and the M gate lines GL (P) are respectively defined. The pixel structure for each pixel P will be described in more detail with reference to FIG.

2A and 2B are equivalent circuit diagrams for one pixel in the display panel of FIG.

Referring to FIG. 2A, each pixel P is connected to one data line DL and receives only one scan signal SCAN through one gate line GL.

2A, each pixel includes an OLED (Organic Light Emitting Diode), and includes a driving transistor DT, a first transistor T1, a second transistor T2, And a storage capacitor Cst. Since each pixel includes three transistors DT, T1, and T2 and one storage capacitor Cst, each pixel has a 3T (Capacitor) structure.

The driving transistor DT in each pixel is supplied with the driving voltage EVDD supplied from the driving voltage line DVL and the voltage of the gate node N2 applied through the second transistor T2 Data voltage) to drive the organic light emitting diode OLED.

The driving transistor DT has a first node N1, a second node N2 and a third node N3. The first transistor N1 is connected to the first transistor T1, The node N2 is connected to the second transistor T2 and the third node N3 is supplied with the driving voltage EVDD.

Here, the first node of the driving transistor DT is a source node (also referred to as a 'source electrode'), the second node is a gate node (also referred to as a gate electrode) The third node N3 may be a drain node (also referred to as a drain electrode). The first node, the second node, and the third node of the driving transistor DT may be changed depending on the type of the transistor, the circuit change, and the like.

The first transistor T1 is controlled by a scan signal SCAN supplied from the gate line GL and is connected to a reference voltage line RVL for supplying a reference voltage Vref And is connected between a connection pattern CP connected to the reference voltage line RVL and the first node N1 of the driving transistor DT. The first transistor T1 is also referred to as a " sensor transistor ".

The second transistor T2 is controlled by a scan signal SCAN commonly supplied from the gate line GL and is connected between the corresponding data line DL and the second node N2 of the driving transistor DT do. The second transistor T2 is also referred to as a " switching transistor ".

The storage capacitor Cst may be connected between the first node N1 and the second node N2 of the driving transistor DT to maintain the data voltage for one frame.

As described above, the first transistor T1 and the second transistor T2 are controlled by a single scan signal supplied through one and the same gate line (common gate line). As described above, since each pixel uses one scan signal, each pixel in the embodiment has a basic pixel structure of " 3T1C-based one scan structure ".

The first transistor T1 is basically a transistor associated with driving by applying a data voltage to the gate node N2 of the driving transistor DT and the second transistor T2 is a transistor associated with driving, Since the two transistors T1 and T2 have different uses and functions, the transistors T1 and T2 are related to the sensing for compensating for the luminance deviation between the pixels, (Driving operation, sensing operation) is also affected.

Referring to FIG. 2B, one pixel P in the display panel 11 of the OLED display 10 basically includes three transistors DT, T1, and T2 and one capacitor Cst Lt; / RTI >

Each pixel P is supplied with two scan signals (a first scan signal and a second scan signal) through two gate lines (a first gate line GL1 and a second gate line GL2). Hereinafter, the first scan signal is also referred to as a "sense signal (SENSE)", and the second scan signal is also referred to as a "scan signal (SCAN)".

In this way, since two scan signals SCAN and SENSE are supplied to each pixel P, this basic pixel structure is referred to as " 2 SCAN STRUCTURE based on 3T1C ".

On the other hand, the pixel structure of the organic light emitting diode display 10 according to the embodiment is different from the pixel structure of the basic pixel structure (one or two scan structure based on 3T1C) described with reference to Figs. 2A and 2B, Signal line connection structure " relating to being connected to various signal lines such as a data line DL, a gate line GL, a driving voltage line DVL, and a reference voltage line RVL.

Although the transistors DT, T1, and T2 are shown and described as being of the N type in the present specification and the drawings, ) May all be changed to P type, or some of transistors DT, T1, T2 may be implemented as N type and others as P type. In addition, the organic light emitting diode (OLED) may be changed to an inverted type.

In addition, the transistors DT, T1, T2 described herein are also referred to as thin film transistors (TFTs).

Hereinafter, the pixel structure including the basic pixel structure (one scanning structure based on 3T1C) and the signal line connecting structure briefly described above will be described in more detail with reference to FIGS. 3 to 5. FIG. 3 to 5 show the case where the basic unit of the signal line connection structure is four pixels.

3 is a plan view schematically showing a part of the display panel of Fig.

3, the basic unit of the signal line connection structure is connected to four data lines DL (4n-3), DL (4n-2), DL (4n-1) (P1 to P4), a basic pixel structure and a signal line connection structure having a 1-scan structure based on 3T1C can be confirmed. The basic unit of the signal line connection structure is four pixels P1 to P4 connected to the four data lines DL (4n-3), DL (4n-2), DL (4n-1) The present invention is not limited thereto, and the basic unit of the signal line connection structure may be two or more pixels connected to two or more data lines.

Each of the four data lines DL (4n-3), DL (4n-2), DL (4n-1) and DL (4n) is connected to each of the four pixels P1 to P4. Further, one gate line GL (m), 1? M? M is connected to four pixels P1 to P4.

Four pixels P1 to P4 connected to four data lines DL (4n-3), DL (4n-2), DL (4n-1) and DL (4n) The driving transistor DT receives the driving voltage EVDD and drives the organic light emitting diode OLED and the driving transistor DT receiving the reference voltage Vref and transmitting the reference voltage Vref to the first node N1 of the driving transistor DT A second transistor T2 receiving the data voltage Vdata and transferring the data voltage Vdata to a second node N2 of the driving transistor DT; And a capacitor Cst connected between the first node N2 and the second node N2.

Each of the four pixels P1 to P4 connected to the four data lines DL (4n-3), DL (4n-2), DL (4n-1) And a structure in which only one scan signal is supplied to the first transistor T1 and the second transistor T2 as well as the 3T1C structure including the data lines DT, T1 and T2 and one capacitor Cst (1-scan structure based on 3T1C in FIG. 2A) or one scan signal is supplied to each of the first transistor T1 and the second transistor T2 (a 3T1C-based one scan structure in FIG. 2B).

As described above, the plurality of signal lines include not only a data line for supplying a data voltage to each pixel and a gate line for supplying a scan signal but also a reference voltage line RVL for supplying a reference voltage Vref to each pixel ), A driving voltage line (DVL) for supplying a driving voltage (EVDD), and the like.

When the basic unit of the signal line connection structure is four pixels (four pixel columns), the number of reference voltage lines may be one fourth of the number of data lines. That is, when the number of data lines is 4N, the number of reference voltage lines may be N. As described above, when the basic unit of the signal line connection structure is two or more pixels, the number of reference voltage lines may be 1 / (the number of pixels of the basic unit) of the number of data lines.

As described above, when the basic unit of the signal line connection structure is four pixels (four pixel columns), the reference voltage line connection structure may be as follows.

A pixel capable of receiving a data voltage from each of four arbitrary data lines DL (4n-3), DL (4n-2), DL (4n-1), DL (4n) Only the pixels P1 through P4 connected to the four data lines DL (4n-3), DL (4n-2), DL (4n-1) and DL (4n) One reference voltage line RVL is connected to the pixels P1 to P4 connected to the four data lines DL (4n-3), DL (4n-2), DL (4n-1) And is formed on the display panel 11 in parallel with the data lines.

The one reference voltage line RVL is connected to two data lines among the four data lines DL (4n-3), DL (4n-2), DL (4n-1) (4n-2) and DL (4n-1), respectively, to supply the reference voltage Vref.

In this specification and the figures, the pixel connected to the 4n-3th data line DL (4n-3), the pixel connected to the 4n-2th data line DL (4n-2) A red pixel, a green pixel, a blue pixel, and a blue pixel, which are connected to a pixel connected to the first data line DL (4n-1) and a 4nth data line DL (4n) White pixel, but the present invention is not limited thereto. For example, the red pixel, the white pixel G, and the blue pixel B or the red pixel R, ) Pixels B (Blue) and G (Green) pixels.

The R pixel, the G pixel, the B pixel, and the W pixel, which are the basic units of the above-described signal line connection structure, are R subpixel, G subpixel, B subpixel and W subpixel constituting a pixel which is the smallest unit forming an image The present invention is not limited thereto.

FIG. 4A illustrates an external compensation scheme (sensing unit and compensation unit) included in the OLED display of FIG. 1. Referring to FIG. 4B is a graph showing the characteristics of the organic light emitting diode of FIG.

Referring to FIG. 4A, as the compensation structure of the OLED display 10 according to an embodiment, degradation of the organic light emitting diode OLED in each sub-pixel P capable of generating a luminance unbalance between pixels is compensated A sensing unit 91 for sensing the degree of deterioration of the organic light emitting diode OLED and a compensation unit 93 for compensating deterioration of the organic light emitting diode OLED in each sub pixel P according to the sensed degree of deterioration, And the like.

The sensing unit 91 can sense the degree of deterioration of one of the four sub-pixels P1 to P4 through the reference voltage line connected to one of the two electrodes of each of the four sub-pixels P1 to P4 have. It is impossible to sense threshold voltages of the organic light emitting diodes of the sub-pixels P1 to P4 in the sub-pixel structure in which one of the two electrodes of each of the four sub-pixels P1 to P4 is connected to one of the reference voltage lines. The organic light emitting diode OLED having the lowest threshold voltage among the four sub-pixels P1 to P4 through the reference voltage line connected to one of the two electrodes of each of the four sub-pixels P1 to P4, Since the deterioration characteristics of the organic light emitting diodes OLED of the four sub-pixels P1 to P4 are uniformly positioned, the threshold voltage of one organic light emitting diode OLED, which is sensed, The degree of deterioration of other sub-pixels can be estimated.

The sensing unit 91 senses a threshold voltage for grasping the degree of deterioration of the organic light emitting diode OLED in each sub pixel P and detects a threshold voltage of the organic light emitting diode OLED of each sub pixel P The voltage of the first node N1 which is one of the electrodes can be sensed. Since the other one of the two electrodes of the organic light emitting diode OLED of each sub pixel P applies the same ground voltage, for example, a ground voltage, the organic light emitting diode of each sub pixel P The voltage of the first node N1, which is one of the two electrodes of the organic light emitting diode OLED, is sensed, so that the threshold voltage of the organic light emitting diode OLED of each subpixel P can be sensed.

Here, the threshold voltage sensing of the organic light emitting diode (OLED) may be performed in a first non-display period before the image is displayed after power is applied to the organic light emitting display device 10. That is, the threshold voltage sensing of the organic light emitting diode can be performed each time power is applied to the organic light emitting display 10.

The sensing unit 91 includes a digital-to-analog converter (DAC) 911 for converting the reference voltage Vref supplied from the reference voltage source into an analog value, An analog digital converter (ADC) 912 for converting the sensed voltage at the first node N1, which is one of the two electrodes of the organic light emitting diode OLED of the pixel P, into a digital value, , One of a reference voltage supply node to which the reference voltage Vref converted from the analog-to-digital conversion unit 911 is supplied and a sensing node connected to the analog-digital conversion unit 912 is connected to the reference voltage line RVL, The first switch 913, and the like.

The sensing unit 91 supplies the four sub-pixels P1 to P4 through the reference voltage line until a constant voltage is discharged, and supplies the organic light emission of the sub- The degree of deterioration of the diode OLED can be sensed.

For example, the sensing unit 91 may switch the first switch 913 to connect the reference voltage supply node to the reference voltage line RVL, and may include a capacitor 92 located inside or outside the reference voltage line RVL, And supplies the reference voltage Vref to one of the terminals. When one terminal of the capacitor 92 is connected to the ground voltage, for example, ground, and the reference voltage is supplied to the other terminal for a predetermined time, the capacitor 92 is charged with the initial voltage Vinit caught by the reference voltage line.

The sensing unit 91 switches the first switch 913 to connect the sensing node connected to the analog-to-digital converter 912 to the reference voltage line RVL and supplies the charged initial voltage Vinit of the capacitor 92, And supplies it to the four sub-pixels P1 to P4 through the reference voltage line RVL. The analog-to-digital converter 912 of the sensing unit 91 receives one of the four sub-pixels P1 through P4, for example, a sub-pixel having the lowest threshold voltage (for example, a B sub-pixel) It is possible to sense the threshold voltage of the organic light emitting diode OLED of FIG.

Referring to FIG. 4B, the charged initial voltage Vinit of the capacitor 92 is discharged, and the remained voltage Vre of the capacitor 92 is lowered. Sub-pixels (for example, R, W, and G sub-pixels) having a threshold voltage higher than the residual voltage Vre of the capacitor 92 among the four sub-pixels P1 to P4 sequentially stop the diode operation do. Finally, if the residual voltage Vre of the capacitor 92 is equal to the threshold voltage Vth of the organic light emitting diode OLED of the last sub-pixel (for example, the B sub-pixel) The diode operation is stopped in the same state as the threshold voltage Vth of the organic light emitting diode OLED of the voltage and the sub pixel (for example, the B sub pixel), and the analog to digital conversion unit 912 of the sensing unit 91 outputs the sensing voltage Vsen) of the organic light emitting diode (OLED) of the sub-pixel (for example, the B sub-pixel) whose operation has stopped last.

In the above example, the sensing unit 91 senses the threshold voltage of one of the four sub-pixels P1 to P4 using the initial voltage Vinit of the capacitor 92 as a current source, However, the present invention is not limited to this, and the threshold voltage of one of the four sub-pixels P1 to P4 can be sensed in any manner known or later implemented.

The sensing unit 91 described above may be included in the data driver 12 or included in the data driver 12.

There may be a plurality of sensing units 91, and each sensing unit 91 may be provided for one data line or one for several data lines. In addition, each sensing unit 91 may be provided for each reference voltage line RVL.

The compensation unit 93 compensates for the deterioration of the four sub pixels P 1 to P 4 according to the degree of deterioration of one of the four sub-pixels P 1 to P 4 sensed through the reference voltage line (for example, the threshold voltage of the organic light emitting diode OLED) P1 to P4 of the organic light emitting diode OLED. The compensation unit 93 receives the deterioration degree of one of the four sub-pixels P1 to P4 from the sensing unit 91 (for example, the threshold voltage of the organic light emitting diode OLED) It is possible to perform a data conversion process for receiving the received digital form voltage and compensating for the deterioration of one of the four sub-pixels P1 to P4 based on the received digital form voltage. The external compensation operation of the compensation unit 93 will be described later with reference to Figs. 6 to 10.

The compensation unit 93 may be configured to receive the deterioration degree of one of the four sub-pixels P1 to P4 from the sensing unit 91 in a digital form, It can be irrelevant. For example, the compensation unit 93 may be included in the timing controller 14, included in the data driver 12, included outside the timing controller 14 and the data driver 12, .

5 is a diagram illustrating an implementation of an external compensation structure included in the OLED display of FIG.

Referring to FIG. 5, in the case where the compensation unit 93 of the external compensation configuration included in the organic light emitting diode display 10 according to the embodiment is included in the timing controller 14 and is implemented (a) (B) when the data driver 12 is implemented outside the data driver 12 and (c) when the data driver 12 is included in the data driver 12, respectively.

5 (a), when the compensation unit 93 is implemented in the data driver 12, the sensing unit 91 detects the threshold voltage Vth sensed by the sub-pixel P, And the compensation unit 93 included in the data driver 12 transmits the organic light emitting diode OL to the organic light emitting diode OLED based on the threshold voltage Vth transmitted from the sensing unit 91. [ And supplies the externally supplied data Data to the DAC (Digital Analog Converter) inside the data driver 12 by converting the externally supplied data Data into the received compensated data Data 'based on the deterioration information of the diode OLED . Accordingly, a digital analog converter (DAC) in the data driver 12 converts the digital data R 'supplied from the compensation unit 93 into analog signals and supplies the converted analog data to the corresponding sub-pixels P .

5 (b), when the compensation unit 93 is embodied outside the timing controller 14 and the data driver 12, the sensing unit 91 performs sensing The compensating unit 93 transmits the sensing voltage Vsen to the compensating unit 93 outside the data driver 12 and the timing controller 14. The compensating unit 93 compensates the threshold voltage Vth transmitted from the sensing unit 91, Based on the deterioration information of the organic light emitting diode OLED and supplies the data Data to the data driver 12 based on the deterioration information. The data driver 12 converts the digital compensation data Data 'supplied from the compensation unit 93 through a DAC (Digital Analog Converter) provided therein and converts the compensated data Data' into analog data and supplies the analog data to the corresponding sub-pixel P.

Referring to FIG. 5C, when the compensation unit 93 is included in the data driver 12, the sensing unit 91 in the data driver 12 is connected to the corresponding sub- The compensating unit 93 transmits the sensed sensing voltage Vsen to the compensating unit 93 in the data driving unit 12. The compensating unit 93 compensates the sensing voltage Vsen of the organic light emitting diode OLED And supplies the data Data 'to the DAC (Digital Analog Converter) by converting the data Data supplied from the timing controller 14 into the compensation data Data' based on the deterioration information. Accordingly, the DAC (Digital Analog Converter) converts the compensation data (Data ') of the digital form supplied from the compensation unit 93 to analog and supplies compensation data (data voltage) Respectively.

5 (b) and 5 (c), the compensation unit 93 may receive the data Data directly from the timing controller 14, but the timing controller 14 may store the data , It can be supplied by reading the data stored in the memory.

An example of the compensation unit 93 shown in FIGS. 5A to 5C is a digital-based compensation scheme for converting digital data Data into digital compensation data Data ' (Data conversion method). In this case, digital type compensation data (Data ') can be generated through calculation processing such as adding or subtracting the digital value of the deterioration information of the organic light emitting diode (OLED) to the digital data Data.

In addition to the embodiment of the compensation unit 93 shown in FIGS. 5A to 5C, that is, the digital-based compensation scheme (data conversion scheme), the data driver 12 may also be connected to the timing controller 14 The DAC of the data driver 12 converts the digital data Data into analog data using the gamma reference voltage and the compensator 93 receives the digital data Data from the sensing unit 91 The deterioration information of the organic light emitting diode OLED that has been received is converted into an analog value and the data voltage converted as analog data is converted based on the characteristic information converted into the analog value to generate the data voltage as the compensation data . This method is a complete analog-based compensation method (data conversion method).

In addition to this complete analog-based compensation method, the data driver 12 receives the digital data Data from the timing controller 14 and the DAC of the data driver 12 (including the compensator 93) The compensation data Data 'is generated using the degradation information of the organic light emitting diode OLED transmitted from the sensing unit 91 when converting the data Data to analog using the gamma reference voltage, Thereby generating a data voltage. This method is also referred to as an analog-based compensation method (data conversion method) because the data is strictly converted in a digital form, but is performed in a step of converting to an analogue (DAC step).

The compensator 93 of FIG. 4 accumulates the data usage for each sub-pixel and accumulates the data usage for each sub-pixel according to the data counting scheme that compensates the degradation of the organic light emitting diode OLED of the sub-pixel according to the accumulated data usage amount In order to compensate the deterioration of the organic light emitting diode (OLED) of the sub-pixel according to the accumulated data usage amount, and the degradation accuracy of the organic light emitting diode (OLED) By sensing the threshold voltage of the organic light emitting diode OLED per sub-pixel sensed by the sensing unit 91, the characteristics of the organic light emitting diode OLED are reflected in the data driving scheme, ) Degradation.

Hereinafter, one example of the former compensation unit will be described with reference to FIGS. 6 to 8, and another example of the latter compensation unit will be described with reference to FIG. 9 and FIG. 10. FIG.

6 is a detailed configuration diagram of an example of the compensation unit of FIG. 7 is a view for explaining external compensation by the compensation unit according to the example of FIG.

Referring to FIG. 6, the compensation unit 93 may include a data processing unit 931, a memory 932, and a data compensation unit 933.

The data processing unit 931 receives the data for each sub-pixel and calculates an amount of data used for each sub-pixel in an accumulation manner. The data processing unit 931 stores the data usage amount for each sub-pixel in the memory 932. [

The memory 932 stores the accumulated data usage amount for each sub-pixel.

For example, as shown in FIG. 7A, the data processor 931 accumulates the gray level values of the input image data of the previous frame and the current frame at a specific time to generate R, W, G, and B The data usage of the pixels can be calculated. As a result, the data usage of the R, W, G, and B sub-pixels may be as shown in Table 1.

Sub pixel R sub-pixel W sub-pixel G sub-pixel B sub-pixel Data usage (tone value) 1275 894 765 450

The memory 932 stores the data usage amount for each sub-pixel in Table 1, accumulates the input image data in the next frame in the data usage amount for each sub-pixel accumulated up to the previous frame, and stores the data for each sub-pixel stored in the memory 932 Update usage.

7 (b), the memory 932 stores the luminance compensation value according to the data usage amount generated from the degradation graph of the known organic light emitting diode (OLED) in the form of a look-up table. For example, the memory 932 exponentially increases (increases) the data usage amount generated from the degradation graph of the organic light emitting diode (OLED) as shown in FIG. 7 (b) And stores the luminance compensation value in the look-up table format.

The data compensating unit 933 estimates the degree of deterioration of the organic light emitting diode OLED by using the data usage amount of each sub pixel stored in the memory 932 and calculates the degree of deterioration of the organic light emitting diode OLED To compensate the image data. The data compensator 933 supplies the compensated data 'data' to the data driver 12.

For example, the data compensating unit 933 compensates the inputted image data of the current frame with the luminance compensation value of the look-up table with respect to the data usage amount of each sub-pixel in Table 1 up to the previous frame stored in the memory 932. Next, the data compensator 933 supplies the compensated image data 'data' to the data driver 12.

8 is a view for explaining a deterioration deviation of the organic light emitting diode depending on the position of the display panel.

The compensation unit 93 described with reference to FIG. 6 uses the same OLED deterioration graph as the entire display panel 11 as shown in FIG. 8A to calculate the luminance compensation value according to the data usage amount And the data compensator 933 compensates the deterioration of the organic light emitting diode OLED by using the luminance compensation value according to the data usage amount of the lookup table.

However, in the actual display panel 11, depending on the position of the display panel 11 as shown in FIG. 8 (b) due to various factors such as the characteristic deviation of the organic light emitting diode OLED, temperature, humidity, Deterioration of the organic light emitting diode (OLED) occurs.

Compensating the deterioration of the organic light emitting diode (OLED) of the sub-pixel using the above-described data tone method is a method of estimating and compensating the deterioration of the organic light emitting diode (OLED) of the sub-pixel only by the data usage amount, , The display panel 11, and the position in the display panel 11 may not be reflected. This is because deterioration of the organic light emitting diode (OLED) of a sub-pixel is caused not only by data usage but also by temperature, humidity, and the characteristics of the organic light emitting diode (OLED) itself.

In order to compensate for the fact that the degradation of the organic light emitting diode (OLED) is not precisely known due to the data counting method and the compensation accuracy is reduced, the compensation unit 93 of another example described with reference to FIG. 9 is provided with the sensing unit 91 The deterioration characteristics of the organic light emitting diode OLED can be compensated for in the data cache scheme through the threshold voltage of the organic light emitting diode OLED according to the sensed sub-pixel, thereby more accurately compensating the deterioration of the organic light emitting diode OLED.

Fig. 9 is a detailed configuration diagram of another example of the compensation unit of Fig. 4; 10 is a view for explaining external compensation by the compensation unit according to another example of FIG.

Referring to FIG. 9, the compensation unit 93 includes a data processing unit 931 for receiving sub-pixel data and calculating data usage for each sub-pixel in an accumulation manner as described with reference to FIG. 6, A memory 932 for storing a luminance compensation value according to a data usage amount generated from the data usage amount for each sub-pixel and the deterioration graph of the organic light emitting diode OLED in a look-up table form, A data compensator 933 for estimating the degree of deterioration of the organic light emitting diode OLED for each sub-pixel and compensating the image data according to the degree of deterioration of the organic light emitting diode OLED according to the estimated sub- Gt; 934 < / RTI >

The deterioration degree calculation unit 934 calculates the deterioration degree of the organic light emitting diode OLED of one sub-pixel sensed through the reference voltage line. The deterioration degree calculation unit 934 calculates a difference value? Vth between the initial threshold voltage Vinit of the sub-pixel having the lowest threshold voltage and the sensed threshold voltage Vth among the four sub-pixels according to Equation 2 below Is calculated as the degree of deterioration of the organic light emitting diode (OLED) of the corresponding sub-pixel.

[Equation 1]

Vth = Vth-Vinit

For example, when the initial threshold voltage (Vinit) of the sub-pixel having the lowest threshold voltage among the four sub-pixels is 0.72 V and the threshold voltage (Vth) sensed by the sensing unit 91 is 0.74 V, the difference (DELTA Vth) of the threshold voltages of the sub-pixels can be 0.2 V as shown in Fig. The deterioration degree calculation unit 934 outputs the difference value (DELTA Vth) of the threshold voltage to the data processing unit 931 at the deterioration degree of the subpixel.

The data processor 931 estimates a data usage amount of the organic light emitting diode OLED of the sub-pixel sensed according to the degree of deterioration of the organic light emitting diode OLED of the sensed sub-pixel. For example, as shown in FIG. 10A, the data processing unit 931 may use the brightness curve corresponding to the difference value of the threshold voltages stored in the memory 932 to determine the brightness of the organic light emitting diode OLED of the sub- The luminance of the organic light emitting diode OLED of the sub-pixel sensed according to the degree of deterioration, that is, the difference value of the threshold voltage (DELTA Vth = 0.2V).

Next, the data processing unit 931 estimates the amount of data usage according to the luminance using the luminance curve according to the data usage amount stored in the lookup table form in the memory 932. For example, in the above example, when the luminance according to the difference value (DELTA Vth = 0.2 V) of the B sub-pixel is 40%, the data processing unit 931 sets the data usage amount stored in the look- As shown in FIG. 10 (b), the data usage amount according to the 40% luminance, for example, 337.5 gradations is estimated. The data processing unit 931 calculates a compensation value for deterioration of the organic light emitting diode OLED according to the estimated data usage amount and supplies the compensation value to the data compensation unit 933. For example, as shown in FIG. 10C, when the actual data usage amount of the B sub pixel is "B (450 gradations)" and the data usage amount estimated in the above manner is "B (337.5 gradations) The processing unit 931 supplies the compensation value according to the estimated data usage amount to the data compensation unit 933. [

The data processor 931 estimates the data usage of the other sub-pixels according to the actual data usage amount of the organic light emitting diode OLED of the sensed sub-pixel and the estimated data usage amount. That is, the data processing unit 931 estimates the data usage amount of each of the other sub-pixels from the actual data usage amount of each of the other sub-pixels by using the actual data usage amount of one sub-pixel and the estimated data usage amount.

The data processor 931 obtains the deterioration gain obtained by dividing the estimated data usage of one sub-pixel by the actual data usage, multiplies the actual data usage of each of the other sub-pixels by the degradation gain, Of the data.

&Quot; (2) "

Degradation Gain = Estimated Data Usage / Actual Data Usage

For example, as shown in FIG. 10C, when the actual data usage amounts of the R, W, and G sub-pixels are 1275, 894, and 765, the data processing unit 931 calculates deterioration gains And the data usage can be estimated as shown in Table 2.

Sub pixel R sub-pixel W sub-pixel G sub-pixel B sub-pixel Actual data usage (grayscale value) 1275 894 765 450 Estimated data usage (grayscale value) 956.25 670.5 573.75 337.5 Deterioration gain 0.75 0.75 0.75 0.75

As a result, the difference between the actual data usage and the estimated data usage is a compensation error that compensates the image data only by the actual data usage, and the estimated data usage compensates the error.

As described above, the data usage amounts may be estimated by multiplying the actual data usage amounts of the R, W, and G sub-pixels by the degradation gain, respectively. However, the present invention is not limited to this, The data usage of the R, W, and G sub-pixels may be estimated by multiplying the actual data usage of the G sub-pixels by the degradation gain and the weight, respectively.

&Quot; (3) "

Estimated data usage = actual data usage of each sub-pixel x degradation gain x weight

The weight is an integer greater than 0, which may be greater than 1 or less than 1. The data processing unit 931 applies a weight greater than 1 when the organic light emitting diode OLED of the sub-pixel other than the organic light emitting diode OLED of the sensed sub-pixel is easily degraded due to deterioration characteristics of the organic light emitting diode OLED, A weight smaller than 1 is applied when the organic light emitting diode OLED of the sub-pixel other than the organic light emitting diode OLED of the sub-pixel sensed in the opposite direction is not easily deteriorated by the deterioration characteristic of the organic light emitting diode OLED, A weight of 1 may be applied when the degradation characteristics of the organic light emitting diode OLED of the organic light emitting diode OLED of the other sub-pixel are degraded in the same manner.

In addition, the data processor 931 may apply the same value regardless of the time to the weight, or may apply another value according to the elapse of time. For example, if the deterioration characteristics of two or more sub-pixels constituting a sub-pixel are the same at the beginning of use and deterioration characteristics vary with time, the data processing unit 931 applies the same weight to a certain point of time, May be applied.

The data processing unit 931 calculates the compensation value of the deterioration of the organic light emitting diode OLED according to the estimated data usage amount of each of the other sub pixels as shown in FIG. 10 (c) (933).

The memory 932 stores the actual data usage amount of each of the two or more sub-pixels, stores an initial threshold voltage for each sub-pixel, stores a luminance curve corresponding to the difference value of the threshold voltage, for example, in a look- As shown in FIG. 10 (c), the luminance compensation value according to the data usage amount generated from the deterioration graph of the organic light emitting diode (OLED) is stored in a look-up table form.

The data compensating unit 933 compensates the input data according to the compensation value of the deterioration of the organic light emitting diode OLED of the two or more sub-pixels, and supplies the compensated data to the data driving unit 12.

The data compensating unit 933 compensates the data amount of each sub-pixel stored in the memory 932 and the threshold voltage of one of the four sub-pixels sensed by the sensing unit 931, And compensates the image data (data) according to the estimated deterioration degree of the organic light emitting diode OLED for each sub-pixel. The data compensator 933 supplies compensated data (data ') for each sub-pixel to the data driver 12.

As a result, the data compensating unit 933 compensates the estimated data usage amount of one sub-pixel having the lowest threshold voltage according to the degree of deterioration of the organic light emitting diode OLED of the sub-pixel having the lowest threshold voltage sensed through the reference voltage line Pixel according to a data usage amount of another sub-pixel estimated according to a comparison value between an actual data usage amount of one sub-pixel and an estimated data usage amount, and the organic light emitting diodes OLED of the sub- The deterioration of the diode OLED can be compensated.

The display panel 11, the sensing unit 91, the compensation unit 93, and the like have been described above in the overall system configuration of the organic light emitting diode display device 10 according to one embodiment. Hereinafter, The gate driver 12 and the gate driver 13 will be briefly described with reference to FIGS. 11 and 12. FIG.

11 is a configuration diagram of the data driver of FIG. 1 for receiving the compensation data and driving the data line.

11, the data driver 12 included in the OLED display 10 includes a shift register 151, a first data register 152, a second data register 153, A digital / analog converter 154 (DAC), an output buffer 155, a data receiving unit 156, and the like.

The data receiving unit 156 receives the compensated video data Data (Data) from the compensation unit 93 included in the timing controller 14 or the data driving unit 12 or included in the timing controller 14 and the data driving unit 12, '), And converts the digital data into predetermined digital data for each sub-pixel and outputs the digital data.

The shift register 151 controls the operation time by using a horizontal clock signal Hclock and a horizontal synchronization signal Hsync for driving a line by line, All the data Data 'corresponding to one gate line GL which receives the clock signal Hclock from the timing controller 14 and selects the horizontal synchronizing signal Hsync as the start signal is inputted to the horizontal clock signal Hclock Synchronized and sequentially sampled and stored in the first data register 152.

The first data register 152 sequentially stores the data Data 'to be implemented by the sub-pixels of the (m-1) th gate line GL (m-1).

The second data register 153 stores the data Data 'stored in the first data register 152 according to the next horizontal synchronization signal Hsync. At this time, data (Data ') to be implemented by the sub-pixels of the m-th gate line GL (m) are sequentially stored in the first data register 152.

Each of the first data register 152 and the second data register 153 described above may be implemented as a latch in which an output and an input are connected to each other through two inverters, 152 and the second data register 153 are also referred to as a first latch and a second latch.

The DAC 154 converts the digital image data Data 'stored in the second data register 153 into an analog data voltage on the basis of the gamma reference voltage supplied from the outside.

The output buffer 155 supplies the data voltage through the data line so as to amplify the pixel driving force, that is, to have sufficient current driving capability for driving the data line.

12 is a configuration diagram of the gate driver of FIG.

12, the gate driver 13 included in the OLED display 10 includes a shift register 161, a level shifter 162, an output buffer 163, and the like.

The shift register 161 receives a vertical synchronization signal Vsync notifying the start of one frame from the timing controller 14 and starts generating a scan pulse so that the output of the scan pulse is sequentially turned on in accordance with the vertical clock signal Vclock do. Further, a logic operation circuit such as preventing the influence of the signal delay by shortening the charging time of the gate line by using the output enable signal (OE) can be included.

The level shifter 162 converts the scan pulse into a voltage capable of turning on and off the first and second transistors T1 and T2 described with reference to Figs. 2A and 2B. That is, the on-voltage Von and the constant voltage Von, which are lower than a predetermined voltage necessary for turning on or turning on the first and second transistors T1 and T2, may be set in accordance with the on-voltage signal Von and the off- To a turn-off voltage (Voff) below.

The output buffer 163 may be formed of a circuit for outputting a scan signal by improving the current driving capability so as to be suitable for driving the gate line GL having an RC load.

2, the gate driver 13 supplies a scan signal to one of the gate nodes of the first and second transistors T1 and T2 through one gate line GL, Likewise, the first and second scan signals can be supplied to the gate nodes of the first and second transistors T1 and T2 through the gate lines GL1 and GL2, respectively.

13 is a flowchart of a deterioration compensation method of a display apparatus according to another embodiment.

Referring to FIGS. 1 and 13, the deterioration compensation method 1300 of the display apparatus according to another embodiment may include a sensing step S1310 and a compensation step S1320.

In the sensing step S1310, the display device 10 displays the organic light emitting diodes OLED of one of the two or more sub-pixels through the reference voltage line connected to one of the two electrodes of each of the two or more sub- The threshold voltage can be sensed.

For example, in the sensing step S1310, when the display device 10 is in a pixel structure that can not sense the threshold voltages of each of two or more sub-pixels, as described above with reference to Figs. 4A and 4B, The threshold voltage of the organic light emitting diode (OLED) of one of the sub-pixels can be sensed.

In the compensation step S1320, the display device 10 subtracts the deterioration degree of the organic light emitting diode OLED of one sub-pixel from the threshold voltage of the organic light emitting diode OLED of the one sub-pixel sensed through the reference voltage line And compensates the deterioration of the organic light emitting diode OLED of the sub pixel according to the data usage amount of one sub pixel estimated according to the degree of deterioration of the organic light emitting diode OLED of the calculated one sub pixel, It is possible to compensate the deterioration of the organic light emitting diode OLED of other sub-pixels according to the data usage amount of other sub-pixels estimated according to the comparison value of the actual data usage amount of pixels and the estimated data usage amount.

For example, in the compensation step 1320, the display device 10 senses the threshold voltage of one of the sub-pixels, as described with reference to FIGS. 4 to 12, It is possible to improve the accuracy of the compensation of the image data by correcting the cumulative data usage amount of the degradation degree of the organic light emitting diode OLED of the sub-pixel of the sub-pixel.

Specifically, the compensation step 1320 may include a degradation degree calculation step S1321, a data usage estimation step S1322, and a data compensation step S1323.

The deterioration degree calculation step S1321 calculates the deterioration degree of the organic light emitting diode OLED of one sub pixel based on the threshold voltage of the organic light emitting diode OLED of one sub pixel sensed through the reference voltage line.

The data usage estimation step 1322 estimates a data usage amount of the organic light emitting diode OLED of one sub-pixel according to the degree of deterioration of the organic light emitting diode OLED of one sub-pixel, The data usage of other sub-pixels is estimated according to the actual data usage of the OLED and the estimated data usage.

The data compensation step 1323 may include the step of compensating the input image of each of the two or more sub-pixels according to the compensation value of the deterioration of the organic light emitting diode OLED of each of the two or more sub-pixels according to the estimated data usage of each of the two or more sub- Data is compensated.

In the above-described embodiments, the display device may further include a pixel structure for sensing the degree of deterioration of the organic light emitting diode OLED per sub-pixel in a pixel structure that can not sense the threshold voltages of each of the two or more sub- It is possible to compensate the deterioration of other sub-pixels by sensing the threshold voltage of the organic light emitting diode (OLED) of one sub-pixel.

Also, the display device can compensate the deterioration characteristic of the organic light emitting diode (OLED) with time according to the above-described embodiments. Accordingly, the display device can improve the luminance reduction due to the deterioration of the organic light emitting diode (OLED) and improve the color temperature drift due to the difference in the degree of deterioration according to the data usage amount.

Also, according to the above-described embodiments, the display device can improve the accuracy of compensation of image data by correcting the cumulative data usage amount of the degree of deterioration of the organic light emitting diode (OLED). Thus, the display device can reduce side effects that may occur due to erroneous external compensation.

As a result, the display device accurately compensates for the deterioration of the organic light emitting diode (OLED) according to the above-described embodiment, thereby improving the lifetime of the display panel.

Although the embodiments have been described with reference to the drawings, the present invention is not limited thereto.

In the embodiment described above, the basic unit of the signal line connection structure is connected to the four sub-pixels DL (4n-3), DL (4n-2), DL (4n- (P1 to P4). However, the present invention is not limited to this, and the basic unit of the signal line connection structure may be two or more pixels connected to two or more data lines as described above. For example, when a pixel is composed of RGB sub-pixels, the basic unit may be three pixels connected to three data lines, and two sub-pixels on the upper side and two sub- In case of a one-pixel structure, the basic unit may be two pixels connected to two data lines.

In the above-described embodiment, the four pixels are R sub pixels, G sub pixels, B sub pixels and W sub pixels constituting a pixel which is the minimum unit for forming an image, but the present invention is not limited thereto. For example, the two or more pixels may be a part of a pixel that forms an image as a whole, or may be a pixel that forms part of an image, or may be a pixel that is a cancellation unit that emits light.

In the present specification, a display device / display element including a graphene quantum dot or the like as a light emitting layer in a broad sense may also be included in the organic light emitting display / display element in this specification.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: organic light emitting display device 11: display panel
12: Data driver 13: Gate driver
14: timing controller DT: driving transistor
T1: first transistor T2: second transistor
DL: Data line GL, GL1, GL2: Gate line
DVL: drive voltage line RVL: reference voltage line
91: sensing part 93: compensation part

Claims (12)

A display panel including at least two pixels disposed at intersections of a data line and a gate line, and including a reference voltage line connected to one of two electrodes of each of the two or more pixels;
A data driver for supplying a data voltage to the display panel through the data line;
A gate driver for supplying a scan signal to the display panel through the gate line;
A timing controller for controlling a driving timing of the data driver and the gate driver; And
And a compensator configured to compensate deterioration of the organic light emitting diode of the two or more pixels based on a deterioration degree of one of the two or more pixels sensed through the reference voltage line. The method according to claim 1,
The pixel is composed of four pixels,
Each of the four pixels further includes a first transistor connected between a connection pattern controlled by a sensing signal and connected to the reference voltage line or the reference voltage line and one of two electrodes of the organic light emitting diode In addition,
The number of reference voltage lines is one fourth of the number of the data lines and the reference voltage line is formed between a region of a pixel connected to the (4n-2) th data line and a region of a pixel connected to the (4n-1) ,
The first transistor included in each of the pixels connected to the (4n-2) -th data line and the (4n-1) -th data line is directly connected to the reference voltage line, and the pixel connected to the And the first transistor included in each of the pixels connected to the (4n) th data line is connected to a connection pattern connected to the reference voltage line. The method according to claim 1,
And a sensing unit for sensing a threshold voltage of one of the two or more pixels through the reference voltage line connected to one of two electrodes of each of the two or more pixels. The method of claim 3,
The sensing unit includes:
An analog-digital converter for converting one of the two or more sensed pixels into a digital value; And
And a switch for switching one of a reference voltage supply node to which a reference voltage is supplied and a sensing node connected to the analog-digital conversion section to be connected to the reference voltage line. The method of claim 3,
Wherein the sensing unit supplies the voltage of the capacitor to the two or more pixels through the reference voltage line until a voltage of a capacitor located inside or outside is discharged, And the threshold voltage of the organic light emitting diode of the pixel is sensed. 6. The method of claim 5,
Wherein the compensation unit comprises:
Compensating the deterioration of the organic light emitting diode of the one pixel according to the estimated data usage amount of the one pixel according to the deterioration degree of the organic light emitting diode of the one pixel sensed through the reference voltage line,
And compensates the deterioration of the organic light emitting diodes of the other pixels according to a data usage amount of the other pixels estimated based on a comparison value between the actual data usage amount of the one pixel and the estimated data usage amount. The method according to claim 6,
Wherein the degree of deterioration of the organic light emitting diode is a difference value between an initial threshold voltage of the one pixel and a sensed threshold voltage and a comparison value between the actual data usage amount of the pixel and the estimated data usage amount is the actual data amount It is the deterioration gain divided by usage,
Wherein the compensating unit calculates the estimated data usage amount of the organic light emitting diode of the other pixel according to the following equation.
Estimated data usage = actual data usage of each pixel x degradation gain x weight The method according to claim 1,
Wherein the compensation unit comprises:
A deterioration degree calculation unit for calculating a deterioration degree of the organic light emitting diode of one pixel sensed through the reference voltage line,
The method comprising: estimating a data usage amount of the organic light emitting diodes of the one pixel according to a degree of deterioration of the organic light emitting diodes of the one pixel sensed; A data processing unit for estimating a data usage amount of pixels,
A memory for storing an actual data usage amount of each of the two or more pixels and storing a compensation value of deterioration of the organic light emitting diodes of the two or more pixels according to an estimated data usage amount of each of the two or more pixels;
And a data compensator configured to compensate the input image data according to the compensation value of the deterioration of the organic light emitting diodes of the two or more pixels and supply the compensated image data to the data driver. The method according to claim 1,
Wherein the compensation unit comprises:
Wherein the timing controller is included in the timing controller, is included in the data driver, or is included outside the timing controller and the data driver. The method according to claim 1,
Wherein the compensation unit comprises:
The image data supplied from the outside is converted into the compensated image data based on the deterioration information of the pixels and supplied to the data driver,
Wherein the timing controller converts the data supplied from the timing controller into the compensated image data before or after conversion to analog based on the deterioration information of the pixels when the data driver is included in the data driver,
And supplies the data supplied from the timing controller to the data driver when the data is included outside the timing controller and the data driver. Device. A sensing step of sensing a threshold voltage of an organic light emitting diode of one of the two or more pixels through a reference voltage line connected to one of two electrodes of each of two or more pixels;
Wherein the degradation degree of the organic light emitting diode of the one pixel is calculated from the threshold voltage of the organic light emitting diode of the one pixel sensed through the reference voltage line, The deterioration of the organic light emitting diode of the pixel is compensated for according to the data usage amount of the one pixel and the data of the other pixel estimated based on the comparison between the actual data usage amount of the one pixel and the estimated data usage amount And compensating the deterioration of the organic light emitting diodes of the other pixels according to a usage amount of the organic light emitting diode. 12. The method of claim 11,
The step of compensating for the degradation comprises:
A deterioration degree calculating step of calculating a deterioration degree of the organic light emitting diode of the one pixel based on a threshold voltage of the organic light emitting diode of one pixel sensed through the reference voltage line;
The method comprising: estimating a data usage amount of the organic light emitting diodes of the one pixel according to a degree of deterioration of the organic light emitting diodes of the one pixel; A data usage estimating step of estimating a data usage amount,
And compensating the input image data of each of the two or more pixels according to the compensation value of the deterioration of the organic light emitting diodes of each of the two or more pixels according to the estimated data usage amount of each of the two or more pixels A method of compensating deterioration of an organic light emitting display device.

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