KR100882694B1 - Organic light emitting display - Google Patents

Abstract

The present invention relates to an organic light emitting display device for improving deterioration of an organic light emitting diode.

An organic light emitting display device according to an embodiment of the present invention sequentially supplies a scan signal to scan lines positioned in at least one of an upper region and a lower region of a panel during a sensing period, and supplies the scan signal to the upper region and during the sensing period. A scan driver for supplying a scan signal to a scan line connected to at least one specific pixel not included in the lower region; A data driver for supplying a specific data signal to data lines in response to the scan signal during the sensing period; Pixels positioned at an intersection of the data lines and the scan lines and configured to generate light in response to an amount of current flowing from a first power source to a second power source; A resistor located between the second power supply and the pixels; An amplifier for amplifying a voltage applied to the resistor during the sensing period; An analog-digital converter for converting the voltage amplified by the amplifier into a digital value; A memory for storing the digital value; A comparison unit configured to generate a comparison value by comparing the digital value of the pixels positioned in at least one of the upper region and the lower region with the digital value of the specific pixel, and to transmit the generated comparison value to a timing controller; A timing controller for storing the comparison value in an internal memory and for changing a bit value of data to be supplied to at least one of the upper region and the lower region corresponding to the comparison value during a normal driving period; The digital value of the previous frame and the digital value of the current frame are stored in the memory, and the comparison unit is configured to perform a first difference between the digital value of each pixel stored in the previous frame and the digital value of each pixel stored in the current frame. The comparison value is generated within a second difference range between the digital value of the specific pixel and the digital value of each of the pixels stored in the current frame.

Description

Organic Light Emitting Display

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

2 is a diagram illustrating an upper region and a lower region from which deterioration information is extracted during a sensing period.

3 is a diagram illustrating an example embodiment of a pixel illustrated in FIG. 1.

4 is a circuit diagram illustrating a connection between a resistor and a pixel unit.

5 is a waveform diagram showing a driving method according to the first embodiment of the present invention.

6 is a waveform diagram showing a driving method according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: scan driver 20: data driver

30: pixel portion 31,32: area

40: pixel 42: pixel circuit

50: timing controller 60: amplifier

70: A / D converter 80: memory

90: comparison unit

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device for improving deterioration of an organic light emitting diode.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, and an organic light emitting display.

Among flat panel displays, an organic light emitting display device displays an image using an organic light emitting diode that generates light by recombination of electrons and holes. Such an organic light emitting display device has an advantage of having a fast response speed and being driven with low power consumption.

In fact, the organic light emitting display controls the amount of current supplied to the organic light emitting diode by using a driving transistor formed for each pixel. Then, the organic light emitting diode generates light having a predetermined brightness in correspondence with the amount of current supplied thereto.

On the other hand, the organic light emitting diode deteriorates in proportion to the use time. When the organic light emitting diode deteriorates, a problem occurs in that light having a lower luminance is generated in response to the same current. In particular, when an organic light emitting display device is used in a mobile phone or the like, a non-uniform image is represented by deterioration of the organic light emitting diode.

In detail, the specific area (upper area and / or lower area) of the panel employed in the cellular phone displays predetermined information without changing the displayed image. For example, the upper area of the panel shows reception sensitivity and power supply. In this case, deterioration of the organic light emitting diode positioned in a specific region of the panel proceeds faster than degradation of the organic light emitting diode positioned in another region, thereby preventing uniform luminance from being displayed. Occurs.

Accordingly, an object of the present invention is to provide an organic light emitting display device capable of displaying uniform brightness by compensating for degradation of an organic light emitting diode occurring in a specific area of a panel.

In order to achieve the above object, an organic light emitting display device according to an exemplary embodiment of the present invention sequentially supplies a scan signal to scan lines positioned in at least one of an upper region and a lower region of a panel during a sensing period. A scan driver for supplying a scan signal to a scan line connected to at least one particular pixel not included in the upper region and the lower region during a sensing period; A data driver for supplying a specific data signal to data lines in response to the scan signal during the sensing period; Pixels positioned at an intersection of the data lines and the scan lines and configured to generate light in response to an amount of current flowing from a first power source to a second power source; A resistor located between the second power supply and the pixels; An amplifier for amplifying a voltage applied to the resistor during the sensing period; An analog-digital converter for converting the voltage amplified by the amplifier into a digital value; A memory for storing the digital value; A comparison unit configured to generate a comparison value by comparing the digital value of the pixels positioned in at least one of the upper region and the lower region with the digital value of the specific pixel, and to transmit the generated comparison value to a timing controller; A timing controller for storing the comparison value in an internal memory and for changing a bit value of data to be supplied to at least one of the upper region and the lower region corresponding to the comparison value during a normal driving period; The digital value of the previous frame and the digital value of the current frame are stored in the memory, and the comparison unit is configured to perform a first difference between the digital value of each pixel stored in the previous frame and the digital value of each pixel stored in the current frame. The comparison value is generated within a second difference range between the digital value of the specific pixel and the digital value of each of the pixels stored in the current frame.

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Hereinafter, preferred embodiments of the present invention may be easily implemented by those skilled in the art with reference to FIGS. 1 to 6 as follows.

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

Referring to FIG. 1, an organic light emitting display device according to an exemplary embodiment of the present invention includes a pixel portion including pixels 40 positioned at intersections of scan lines S1 to Sn and data lines D1 to Dm. 30, a scan driver 10 for driving the scan lines S1 to Sn, a data driver 20 for driving the data lines D1 to Dm, a scan driver 10 and a data driver ( 20, the timing control unit 50 is configured to convert some of the first data Data1 from the first data Data1 supplied from the outside into the second data Data2.

In addition, the organic light emitting display device according to an exemplary embodiment of the present invention includes a resistor Rs positioned between the second power supply ELVSS and the pixel unit 30 and an amplification for amplifying a voltage applied to the resistor Rs. Section 60, an analog-to-digital converter (hereinafter referred to as an "A / D converter") 70 for changing the voltage amplified by the amplifier 60 into a digital value, and A Memory 80 for storing the digital value supplied from the / D conversion unit 70 and the comparison unit 90 for comparing the value stored in the memory 80, and delivers the comparison result to the timing controller 50 It is provided.

The scan driver 10 sequentially supplies scan signals to the scan lines S1 to Sn when the pixel unit 30 is normally driven. When the scan signals are sequentially supplied to the scan lines S1 to Sn, the pixels 40 are sequentially selected for each line. In this case, the pixels 40 selected for the scan signal are supplied with the data signals from the data lines D1 to Dm.

The scan driver 10 supplies a scan signal to some scan lines S so that degradation information of at least one horizontal line of pixels 40 included in the pixel unit 30 can be sensed during the sensing period. In fact, in the present invention, as shown in FIG. 2, deterioration information of the pixels 40 positioned in at least one of the upper region 31 and the lower region 32 of the pixel portion 30 (or the panel) may be obtained. Sensing. In this case, the scan driver 10 sequentially supplies a scan signal to the pixels 40 positioned in at least one of the upper region 31 and the lower region 32. For example, the scan driver 10 may include the first scan line S1, the second scan line S2, and the n−1 th scan line Sn located in the lower region 32 during the sensing period. -1) and scan signals are sequentially supplied to the nth scan line Sn.

In addition, the scan driver 10 supplies a scan signal so that at least one specific pixel 41 located in an area except the upper area 31 and the lower area 32 can be selected during the sensing period. For example, during the sensing period, the scan driver 10 supplies a scan signal so that the specific pixel 41 located at the center of the pixel unit 30 can be selected.

The data driver 20 simultaneously supplies data signals to the data lines D1 to Dm when the pixel unit 30 is normally driven. Then, the data signal is supplied to the pixels 40 selected by the scan signal.

The data driver 20 sequentially supplies specific data signals to the data lines D1 to Dm when the scan signals are supplied to the scan lines S positioned in the upper region 31 and the lower region 32 during the sensing period. do. When the specific pixel 41 is selected, the data driver 20 supplies a specific data signal to the data line D connected to the specific pixel 41.

The resistor Rs positioned between the second power supply ELVSS and the pixel portion 30 includes the pixel 40 and the specific pixel 41 positioned in the upper region 31 and / or the lower region 32 during the sensing period. A predetermined current is supplied from. At this time, a predetermined voltage corresponding to the current is applied to the resistor Rs.

Transistor M10 is formed in parallel with resistor Rs. Such a transistor M10 is turned off during the sensing period and turned on for the rest of the period. That is, the transistor M10 is turned off during the sensing period so that a predetermined voltage is applied to the resistor Rs, and the transistor M10 is turned on during the normal driving period to prevent unnecessary power consumption. .

The amplifier 60 amplifies the voltage applied to the resistor Rs and supplies the amplified voltage to the A / D converter 70.

The A / D converter 70 changes the voltage supplied from the amplifier 60 to a digital value and supplies it to the memory 80.

The memory 80 stores the digital value supplied from the A / D converter 70.

The comparison unit 90 compares the digital values of the pixels located in the upper region 31 and / or the lower region 32 stored in the memory 80 with the digital values of the specific pixel 41, and compares the digital result with the timing controller. Supply to 50.

The timing controller 50 stores the comparison value supplied from the comparator 90. For this purpose, a memory (not shown) is provided inside the timing controller 50. Thereafter, the timing controller 50 receives the first data Data from the outside. In this case, when the first data Data1 is data to be supplied to the upper region 31 and / or the lower region 32, deterioration of the organic light emitting diode OLED may be compensated for in response to the comparison value stored in the internal memory. The bit value of the first data Data1 is changed to generate the second data Data2. The timing controller 50 supplies the second data Data2 to the data driver 20.

On the other hand, the timing controller 50 is the first data (Data1) without changing the bit value when the first data (Data1) is to be supplied to other areas except the upper region 31 and / or lower region 32 Is supplied to the data driver 20.

In addition, the timing controller 50 generates a data driving control signal DCS and a scan driving control signal SCS in response to synchronization signals (not shown) supplied from the outside. The data drive control signal DCS generated by the timing controller 50 is supplied to the data driver 20, and the scan drive control signal SCS is supplied to the scan driver 10.

The pixel unit 30 receives the first power source ELVDD and the second power source ELVSS from the outside and supplies the same to the pixels 40. Each of the pixels 40 supplied with the first power source ELVDD and the second power source ELVSS receives a data signal when a scan signal is supplied, and generates light having a predetermined luminance in response to the supplied data signal.

2 is a view showing a pixel portion of the present invention.

Referring to FIG. 2, in the present invention, deterioration of the pixels 40 included in the upper region 31 and / or the lower region 32 of the pixel portion 30 (or the panel) is compensated for. In other words, when the organic light emitting display device is employed in a mobile phone, predetermined information is expressed for a long time in the upper region 31 and / or the lower region 32. Therefore, the organic light emitting diode included in the pixels 40 positioned in the upper region 31 and / or the lower region 32 is faster than the organic light emitting diode included in the pixels 40 positioned in the other region. Deteriorates.

The upper region 31 and / or the lower region 32 is set to include at least one horizontal line (ie, one scanning line). For example, the number of scanning lines included in each of the upper region 31 and / or the lower region 32 is set at 1/8 or less of the entire scanning lines.

3 is a diagram illustrating an example embodiment of a pixel illustrated in FIG. 1. In FIG. 3, two transistors M1 and M2 are included in the pixel circuit 42, but the present invention is not limited thereto. Indeed, as the pixel 40 of the present invention, pixels of various structures currently known may be applied.

Referring to FIG. 3, a pixel 40 according to an exemplary embodiment of the present invention is connected to an organic light emitting diode OLED, a data line Dm, and a scan line Sn to control the organic light emitting diode OLED. (42) is provided.

The anode electrode of the organic light emitting diode OLED is connected to the pixel circuit 42, and the cathode electrode is connected to the second power source ELVSS. Such an organic light emitting diode (OLED) generates light having a predetermined luminance in response to a current supplied from the pixel circuit 42.

The pixel circuit 42 controls the amount of current supplied to the organic light emitting diode OLED corresponding to the data signal supplied to the data line Dm when the scan signal is supplied to the scan line Sn. To this end, the pixel circuit 42 includes a second transistor M2 connected between the first power source ELVDD and the organic light emitting diode OLED, the second transistor M2, the data line Dm, and the scan line Sn. And a first capacitor M1 connected between the first transistor M1 and a storage capacitor Cst connected between the gate electrode and the first electrode of the second transistor M2.

The gate electrode of the first transistor M1 is connected to the scan line Sn, and the first electrode is connected to the data line Dm. The second electrode of the first transistor M1 is connected to one terminal of the storage capacitor Cst. Here, the first electrode is set to any one of a source electrode and a drain electrode, and the second electrode is set to an electrode different from the first electrode. For example, when the first electrode is set as the source electrode, the second electrode is set as the drain electrode. The first transistor M1 connected to the scan line Sn and the data line Dm is turned on when a scan signal is supplied from the scan line Sn to receive a data signal supplied from the data line Dm to the storage capacitor Cst. ). In this case, the storage capacitor Cst charges a voltage corresponding to the data signal.

The gate electrode of the second transistor M2 is connected to one terminal of the storage capacitor Cst, and the first electrode is connected to the other terminal of the storage capacitor Cst and the first power supply ELVDD. The second electrode of the second transistor M2 is connected to the anode electrode of the organic light emitting diode OLED. The second transistor M2 controls the amount of current flowing from the first power source ELVDD to the organic light emitting diode OLED in response to the voltage value stored in the storage capacitor Cst. In this case, the organic light emitting diode OLED generates light corresponding to the amount of current supplied from the second transistor M2.

4 is a diagram illustrating a connection between a resistor and pixels.

Referring to FIG. 4, the resistor Rs is connected to the cathode of the organic light emitting diode OLED included in each of the pixels. Here, although the cathode electrode of the organic light emitting diode OLED is illustrated as being connected with a wire in the form of a line, this is represented in a circuit for convenience of description. In general, the cathode electrode is formed in a plate shape and commonly connected to the organic light emitting diode OLED formed in all the pixels 40.

5 is a diagram illustrating driving waveforms supplied during a sensing period. Here, the sensing period is located at at least one of the power on time and the power off time. Hereinafter, for convenience of description, it is assumed that degradation information of the pixels 40 connected to the first scan line S1 and the second scan line S2 is sensed during the sensing period.

3 to 5, the operation process will be described in detail. First, the control signal CS is supplied during the sensing period. When the control signal is supplied, the transistor M10 is turned off. Therefore, the current supplied from the pixels 40 is set to flow through the resistor Rs.

After the transistor M10 is turned off, the scan signal is supplied to the first scan line S1. When the scan signal is supplied to the first scan line S1, the first transistor M1 included in the pixels 40 connected to the first scan line S1 is turned on.

Thereafter, a specific data signal is supplied to the first data line D1. Here, the specific data signal is set as a data signal capable of producing the maximum luminance in the pixel 40. When the specific data signal is supplied to the first data line D1, the specific data signal is supplied to the pixel 40 connected to the first data line D1 and the first scan line S1, thereby supplying the pixel 40 to the pixel 40. A predetermined current is supplied to the resistor Rs via the organic light emitting diode OLED.

The amplifier 60 amplifies the voltage applied to the resistor Rs in response to a predetermined current and supplies the amplified voltage to the A / D converter 70. The A / D converter 70 changes the voltage supplied from the amplifier 60 to a digital value and transfers the converted voltage to the memory 80. The memory 80 stores the digital value supplied from the A / D converter 70.

After the specific data signal is supplied to the first data line D1, the specific data signal is sequentially supplied to the second data line D2 to the m-th data line Dm, so that the respective pixels are stored in the memory 80. The corresponding digital value is stored.

After the scan signal is supplied to the first scan line S1, the scan signal is supplied to the second scan line S2. The specific data signal is sequentially supplied to the first data line D1 to the mth data line Dm during the period in which the scan signal is supplied to the second scan line S2, and the respective pixels are stored in the memory 80. The corresponding digital value is stored.

Thereafter, the scan signal is supplied to the scan line Si connected to the specific pixel 41, and the specific data signal is supplied to the data line Dj connected to the specific pixel 41. Then, the current flowing in the specific pixel 41 is supplied to the resistor Rs, and the voltage applied to the resistor Rs corresponding to the current is changed into a digital value and stored in the memory 80.

After the digital value of the specific pixel 41 is stored in the memory 80, the comparator 90 may connect the digital value of the specific pixel 41 and the pixels connected to the first scan line S1 and the second scan line S2. Compare the digital value of 40. For example, the comparison unit 90 compares the digital value of the pixel 40 connected to the first scan line S1 and the first data line D1 with the digital value of the specific pixel 41, and compares the result of the comparison. It supplies to the timing control part 50.

In detail, the digital value of the pixel 40 connected to the first scan line S1 and the first data line D1 that deteriorates quickly is set to a lower value than the digital value of the specific pixel 41. For example, the digital value of the pixel 40 connected to the first scan line S1 and the first data line D1 is set to "0.6", and the digital value of the specific pixel 41 is set to "1". If set, the comparator 90 transmits a value of 0.4 to the timing controller 50. Then, a value of 0.4 is stored in the internal memory of the timing controller 50. In the same manner, the comparator 90 compares the digital value of the specific pixel 41 with other digital values and transmits the digital value to the timing controller 50.

Thereafter, the first data Data1 is supplied to the timing controller 50 during the normal driving period. Here, the timing controller 50 uses bits of the first data Data1 to be supplied to the pixel 40 connected to the first scan line S1 and the second scan line S2 using the comparison value stored in the internal memory. The value is changed to generate second data Data2. Here, the bit value of the second data Data2 is changed so that degradation of the organic light emitting diode may be compensated for in response to the comparison value. In other words, when the first data data1 having the same gradation is supplied, the timing controller includes a pixel in which light having the same brightness as that of the specific pixel 41 is connected to the first scan line S1 and the second scan line S2. The bit value of the second data Data2 is changed to be generated from 40.

Similarly, the timing controller 50 generates the second data Data2 by changing bit values of the first data Data to be supplied to the pixels connected to the first scan line S1 and the second scan line S2, The generated second data Data2 is transferred to the data driver 20.

Meanwhile, the timing controller 50 controls the data driver 20 to supply the first data Data1 to be supplied to the pixels 40 not connected to the first scan line S1 and the second scan line S2 without changing the bit value. To pass. In addition, the transistor M10 remains turned on during the normal driving period.

The data driver 20 generates a data signal using the second data Data2 and the first data Data1 supplied to the data driver 20, and supplies the generated data signal to the data lines D1 to Dm.

Here, the data signal supplied to the pixels connected to the first scan line S1 and the second scan line S2 is generated by the second data Data2. Accordingly, deterioration of the organic light emitting diodes included in the pixels positioned in the upper region 31 is compensated for, and thus, the image of the uniform brightness may be displayed in the pixel unit 30.

6 is a diagram illustrating another embodiment of a driving waveform supplied during a sensing period.

Referring to FIG. 6, the control signal CS is supplied during the sensing period so that the transistor M10 is turned off. After the transistor M10 is turned off, the scan signal is supplied to the first scan line S1. After the scan signal is supplied to the first scan line S1, a specific data signal is simultaneously supplied to the data lines D (R) connected to the red pixel. Here, the red pixel refers to a pixel generating red light in the organic light emitting diode.

When a specific data signal is simultaneously supplied to the red pixel, a predetermined amount of current is supplied from the red pixels connected to the first scan line S1 to the resistor Rs.

The amplifier 60 amplifies the voltage applied to the resistor Rs in response to a predetermined amount of current and supplies the amplified voltage to the A / D converter 70. The A / D converter 70 changes the voltage supplied from the amplifier 60 to a digital value and transfers the converted voltage to the memory 80. The memory 80 stores the digital value supplied from the A / D converter 70.

After the specific data signal is supplied to the red pixel, the specific data signal is simultaneously supplied to the data lines D (G) connected to the green pixel during the period in which the scan signal is supplied to the first scan line S1. The predetermined digital value is stored in. During the period in which the scan signal is supplied to the first scan line S1, a specific data signal is simultaneously supplied to the data lines D (B) connected to the blue pixel to store a predetermined digital value in the memory 80.

Thereafter, the scan signal is supplied to the scan line Si connected to the specific pixel 41, and the specific data signal is supplied to the data line Dj connected to the specific red pixel. Then, the current flowing in the specific red pixel is supplied to the resistor Rs, and the voltage applied to the resistor Rs corresponding to the current is changed into a digital value and stored in the memory 80.

During the period in which the scan signal is supplied to the scan line Si, the specific data signal is supplied to the data line Dj + 1 connected to the specific green pixel, and a predetermined digital value is stored in the memory 80. In addition, during a period in which the scan signal is supplied to the scan line Si, the specific data signal is supplied to the data line Dj + 2 connected to the specific blue pixel to store a predetermined digital value in the memory 80.

The comparator 90 compares each of the digital values of the red specific pixels with the digital values of the red pixels, and supplies the comparison result to the timing controller 50. Here, the comparison unit 90 changes the digital values of the red pixels to average values and compares them with the digital values of the red specific pixels. In addition, the comparator 90 compares each of the digital value of the green specific pixel with the digital value of the green pixels, and supplies the comparison result to the timing controller 50. Here, the comparison unit 90 changes the digital values of the green pixels to average values and compares the digital values of the green specific pixels. The comparator 90 compares each of the digital values of the blue specific pixels with the digital values of the blue pixels, and supplies the comparison result to the timing controller 50. Here, the comparison unit 90 changes the digital values of the blue pixels to average values and compares the digital values with the digital values of the blue specific pixels.

Thereafter, the first data Data1 is supplied to the timing controller 50 during the normal driving period. Here, the timing controller 50 uses the comparison value stored in the internal memory to determine the first data supplied to the red, green, and blue pixels connected to the first scan line S1 and the second scan line S2. The second data Data2 is generated by changing the bit value of Data1. In this case, the timing controller 50 changes each of the first data Data1 to be supplied to the red pixel connected to the first scan line S1 and the second scan line S2 so that the same bit value increases or decreases. 2 Generate data (Data2). Similarly, the timing controller 50 changes the first bit Data1 to be supplied to the green pixel and the blue pixel so that the same bit value is increased or decreased to generate the second data Data2.

Meanwhile, the timing controller 50 controls the data driver 20 to supply the first data Data1 to be supplied to the pixels 40 not connected to the first scan line S1 and the second scan line S2 without changing the bit value. To pass.

The data driver 20 generates a data signal using the second data Data2 and the first data Data1 supplied to the data driver 20, and supplies the generated data signal to the data lines D1 to Dm.

Here, the data signal supplied to the pixels connected to the first scan line S1 and the second scan line S2 is generated by the second data Data2. Accordingly, deterioration of the organic light emitting diodes included in the pixels positioned in the upper region 31 is compensated for, and thus, the image of the uniform brightness may be displayed in the pixel unit 30. In addition, the driving method illustrated in FIG. 6 has an advantage of shortening a sensing period because deterioration information of each of the red pixels, the green pixels, and the blue pixels is simultaneously sensed.

Meanwhile, the digital value sensed in the previous sensing period and the digital value sensed in the current sensing period may be simultaneously stored in the memory 80 of the present invention. In this case, the comparator 90 further compares the digital value measured in the previous sensing period and the digital value measured in the current sensing period. For example, assuming that the digital value measured in the previous sensing period is "0.2" in the predetermined pixel and the value measured in the current sensing period is "0.5", the comparator 90 extracts the value of "0.3". do. In addition, if it is assumed that the value of the specific pixel measured in the current sensing period is "1.0", the comparator 90 extracts the value of "0.5".

In addition, the comparison unit 90 transmits a value between "0.3" and "0.5" to the timing controller 50 as a comparison value. As such, when the value extracted in the previous sensing period is further compared with the value extracted in the current sensing period, limiting the range of the comparison value prevents the luminance difference from occurring at the boundary between the deteriorated and uncompensated pixels. can do.

The above detailed description and drawings are merely exemplary of the present invention, but are used only for the purpose of illustrating the present invention and are not intended to limit the scope of the present invention as defined in the meaning or claims. Accordingly, those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical protection scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

As described above, according to the organic light emitting display device according to an exemplary embodiment of the present invention, an image having a uniform luminance is displayed by compensating for degradation of pixels located in at least one of an upper region and a lower region in which deterioration proceeds quickly. There is an advantage to this.

Claims (16)

The scanning signal is sequentially supplied to scan lines positioned in at least one of the upper and lower regions of the panel during the sensing period, and connected to at least one specific pixel not included in the upper and lower regions during the sensing period. A scan driver for supplying a scan signal to the scanned line; A data driver for supplying a specific data signal to data lines in response to the scan signal during the sensing period; Pixels positioned at an intersection of the data lines and the scan lines and configured to generate light in response to an amount of current flowing from a first power source to a second power source; A resistor located between the second power supply and the pixels; An amplifier for amplifying a voltage applied to the resistor during the sensing period; An analog-digital converter for converting the voltage amplified by the amplifier into a digital value; A memory for storing the digital value; A comparison unit configured to generate a comparison value by comparing the digital value of the pixels positioned in at least one of the upper region and the lower region with the digital value of the specific pixel, and to transmit the generated comparison value to a timing controller; A timing controller for storing the comparison value in an internal memory and for changing a bit value of data to be supplied to at least one of the upper region and the lower region corresponding to the comparison value during a normal driving period; The digital value of the previous frame and the digital value of the current frame are stored in the memory, and the comparison unit is configured to perform a first difference between the digital value of each pixel stored in the previous frame and the digital value of each pixel stored in the current frame. And generating the comparison value within a second difference between a digital value of the specific pixel and a digital value of each of the pixels stored in the current frame. The method of claim 1, The number of scanning lines included in each of the upper region and the lower region is set to 1/8 or less of the number of scanning lines included in the panel. The method of claim 1, The timing controller may be configured to change the bit value of the data such that pixels located in at least one of the upper region and the lower region and the specific pixel may generate light having the same luminance when the same data signal is supplied. An organic light emitting display device. The method of claim 1, And wherein the specific data signal is a data signal in which the pixels emit light at maximum luminance. The method of claim 1, And the specific pixel is a pixel located at the center of the panel. The method of claim 1, And the data driver sequentially supplies a specific data signal to the data lines when the scan signal is supplied to at least one of the upper region and the lower region during the sensing period. The method of claim 1, The data driver may include data lines connected to a red pixel, data lines connected to a green pixel, and data lines connected to a blue pixel when a scan signal is supplied to at least one scan line among the upper and lower regions during the sensing period. And supplying the specific data signal sequentially. The method of claim 7, wherein The specific pixel is a specific red pixel, a specific green pixel, and a specific blue pixel not included in the upper region and the lower region. delete delete The method of claim 1, And the sensing period is located at at least one of a power-on time and a power-off time. The method of claim 1, And a transistor formed in parallel with the resistor and turned off during the sensing period and turned on during the normal driving period. delete delete delete delete

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