KR102333798B1 - Organic light emitting display device and driving method thereof - Google Patents

Abstract

An organic light emitting display device capable of improving a compensation lifespan by adaptively changing a compensation range of compensation data for compensating a luminance level of each pixel is provided. The organic light emitting display device includes a lookup table compensator, a reference value setter, and a bit adjuster to generate compensation data for compensating for a luminance level of a specific region of an image signal.

Description

Organic light emitting display device and operating method thereof

The present invention relates to an organic light emitting display device capable of improving a deterioration compensation lifespan by adaptively changing a compensation range of compensation data, and an operating method thereof.

Flat panel displays (FPDs) are used in various types of electronic products, including mobile phones, tablet PCs, and notebook computers. Flat panel displays include a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting display (OLED), and the like, and recently an electrophoretic display ( EPD: ELECTROPHORETIC DISPLAY) is also widely used.

Among them, the organic light emitting display device (OLED) has advantages of fast response speed, high luminous efficiency, luminance, and a large viewing angle by using a self-emitting device that emits light by itself.

An organic light emitting diode display includes a display panel including a plurality of pixels and a driving circuit for emitting light of each pixel. Each pixel of the display panel is formed in a region defined by intersections of a plurality of gate lines and a plurality of data lines.

1 is a diagram illustrating a pixel structure of a general organic light emitting display device.

As shown in FIG. 1 , each pixel 10 of the organic light emitting diode display includes a switching transistor ST, a driving transistor DT, a capacitor C, and an organic light emitting diode (OLED).

The switching transistor ST is switched according to a gate signal supplied through the gate line GL and supplies image data, that is, a data signal, supplied to the data line DL to the driving transistor DT.

The driving transistor DT is switched according to the data signal supplied from the switching transistor ST to control the driving current Id flowing to the organic light emitting diode OLED by the driving voltage of the driving voltage source VDD.

The capacitor C is connected between the gate electrode and the source electrode of the driving transistor DT, stores a voltage corresponding to the data signal supplied to the gate electrode of the driving transistor DT, and uses the stored voltage of the driving transistor DT. The turn-on period is maintained for one frame.

The organic light emitting diode OLED is connected between the source electrode of the driving transistor DT and the base voltage source VSS, and emits light by the driving current Id supplied from the driving transistor DT.

Each pixel 10 of the above-described organic light emitting display device controls the size of the driving current Id flowing to the organic light emitting diode OLED by the driving voltage using the switching of the driving transistor DT according to the data signal. An image is displayed by emitting light from the light emitting device (OLED).

On the other hand, as the driving time of the organic light emitting display device increases, the deterioration of the organic light emitting diode (OLED) proceeds, and the deterioration of the organic light emitting diode (OLED) causes non-uniformity in luminance of an image displayed on the organic light emitting display device.

Accordingly, in the conventional organic light emitting display device, compensation data according to the degree of deterioration of the organic light emitting diode (OLED) is generated, and the level of the data signal applied to each pixel 10 is adjusted using this to reduce the luminance level. Through compensation, deterioration of organic light emitting diodes (OLEDs) is reduced.

2 is a graph showing compensation data for conventional luminance compensation.

As shown in FIG. 2 , the compensation data β appears as an exponential function whose level gradually decreases with time. In the conventional organic light emitting display device, the luminance levels of the remaining pixels except for the deteriorated pixels are reduced by using the compensation data β.

The compensation data β is generated with a limited number of bits. Accordingly, the compensation range (Range) of the compensation data (β) is also limitedly set, and the compensation unit (Resolution) of the compensation data (β) is also limitedly set.

For example, when the compensation data β is generated in 8 bits, the compensation range is set to 0.5 to 1. At this time, the compensation unit of the compensation data β ^{is set to 0.5/2 8} , and compensation is performed in units of approximately 0.00195V.

As described above, since the number of bits generating the compensation data β is limited in the conventional organic light emitting display device, a compensation range and a compensation unit are also limited, which reduces the compensation life of the organic light emitting display device.

That is, as shown in FIG. 2 , since the compensation data β can be compensated only within the compensation range, the compensation life of the organic light emitting diode display is also shortened according to the compensation range.

In addition, in order to increase the compensation range or compensation unit, it is necessary to increase the number of bits generating the compensation data β, which causes an increase in the amount of memory used in the organic light emitting display device, thereby increasing the manufacturing cost of the organic light emitting display device.

An object of the present invention is to provide an organic light emitting diode display capable of improving compensation accuracy while increasing a compensation lifespan of compensation data by adaptively changing a compensation range of compensation data, and an operating method thereof.

In order to achieve the above object, an organic light emitting display device of the present invention includes a lookup table compensator, a reference value setting unit, and a bit adjuster to generate compensation data for compensating for a luminance level of a specific region of an image signal.

A plurality of initial values are stored in the lookup table compensator, and the first compensation data is generated by extracting one or more initial values from among the plurality of initial values according to information input from the outside.

The reference value setting unit calculates a minimum section value from the first compensation data according to the first set value input from the outside.

The bit adjusting unit sets a compensation range from the minimum section value according to the second set value input from the outside, and generates the second compensation data from the first compensation data within the set compensation range.

The method of operating an organic light emitting display device of the present invention for achieving the above object includes generating first compensation data, setting a compensation range therefrom, generating second compensation data from the first compensation data, and generating the second compensation data. and generating compensation image data by compensating for a luminance level of a specific region of the image signal according to the data.

The compensation range is calculated from the first compensation data according to the first set value input from the outside, and is set from the minimum section value according to the second set value.

In the organic light emitting display device of the present invention, the compensation life of the compensation data can be increased by setting the compensation range of the compensation data to be adaptively changed according to the compensation data.

In addition, by narrowing the compensation range based on the compensation data, even if compensation data is generated with a small number of bits, the number of compensation units of the compensation data can be increased to set a compensation unit with a fine size, and accordingly, using the compensation data Accurate luminance level compensation can be performed.

1 is a diagram illustrating a pixel structure of a general organic light emitting display device.
2 is a graph showing compensation data for conventional luminance compensation.
3 is a diagram illustrating a configuration of an organic light emitting display device according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating the configuration of the deterioration compensator shown in FIG. 3 .
FIG. 5 is a flowchart illustrating an operation of the deterioration compensator shown in FIG. 3 .
6A and 6B are diagrams showing compensation data according to the related art and compensation data according to the present invention.
7 is a diagram illustrating deterioration compensation of an organic light emitting display device according to the related art compensation data.
8 is a diagram illustrating deterioration compensation of an organic light emitting display device according to compensation data of the present invention.

Hereinafter, an organic light emitting display device according to the present invention will be described in detail with reference to the accompanying drawings.

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

Referring to FIG. 3 , the organic light emitting display device 100 may include a display panel 110 and a panel driver for driving the display panel 110 .

The display panel 110 is formed in which a plurality of gate lines GL and a plurality of data lines DL intersect each other, and each pixel, for example, a sub-pixel SP, is formed at each intersection of the gate line GL and the data line DL. ) is formed.

Each sub-pixel SP may include a switching transistor ST, a driving transistor DT, a capacitor C, and an organic light emitting diode (OLED).

The switching transistor ST may include a gate electrode connected to the gate line GL, a source electrode connected to the data line DL, and a drain electrode connected to the gate electrode of the driving transistor. The switching transistor ST is turned on according to the gate signal supplied to the gate line GL, so that the data signal supplied to the data line DL, that is, the data voltage, can be applied to the gate electrode of the driving transistor DT. have.

The capacitor C may be connected between the gate electrode and the drain electrode of the driving transistor DT. The capacitor C may charge a difference voltage between the voltages supplied to the gate electrode and the drain electrode of the driving transistor DT, and then switch the driving transistor DT according to the charged voltage.

The driving transistor DT includes a gate electrode commonly connected to the drain electrode of the switching transistor ST and one electrode of the capacitor C, a source electrode connected to a voltage line, the other electrode of the capacitor C, and an organic light emitting diode (OLED). It may be composed of a drain electrode commonly connected to the anode electrode of The driving transistor DT is turned on by the voltage of the capacitor C for each light emission period, and may control the magnitude of the driving current Id flowing to the organic light emitting diode OLED by the driving voltage VDD.

The organic light emitting diode OLED may include an anode electrode connected to the drain electrode of the driving transistor DT and a cathode electrode to which the base voltage VSS is supplied. The organic light emitting diode OLED may emit light by the driving current Id applied from the driving transistor DT. The organic light emitting diode OLED may emit light having a luminance corresponding to the magnitude of the driving current Id.

The panel driver may include a gate driver 120 , a data driver 130 , a timing controller 140 , and a degradation compensator 150 .

The gate driver 120 may generate a gate signal according to the gate control signal GCS provided from the timing controller 140 . The gate signal may be sequentially output to the plurality of gate lines GL of the display panel 110 .

The data driver 130 may generate a data signal, ie, a data voltage, from the image data RGB′ according to the data control signal DCS provided from the timing controller 140 . The data signal may be output to the plurality of data lines DL of the display panel 110 .

The data driver 130 receives a plurality of reference gamma voltages from a gamma voltage supply unit (not shown), converts the image data RGB' into an analog data signal using the plurality of reference gamma voltages, and converts the data line DL ) can be printed.

The timing controller 140 may generate a gate control signal GCS and a data control signal DCS according to a control signal CNT input from an external system (not shown).

The gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC, an output enable signal GOE, and the like, and is output to the gate driver 120 . The data control signal DCS includes a source start pulse SSP, a source sampling clock SSC, an output enable signal SOE, a polarity control signal POL, and the like, and is output to the data driver 130 .

The timing controller 140 may generate image data RGB′ according to the compensation image data CDATA provided from the deterioration compensator 150 , and output the image data RGB′ to the data driver 130 .

The deterioration compensator 150 may generate compensation image data CDATA from an image signal RGB input from an external system, and output it to the timing controller 140 . The deterioration compensator 150 generates compensation data according to at least one of the time information TI and the stress information SI, and reduces the luminance level of a specific region of the image signal RGB by using the generated compensation data. compensation image data CDATA can be generated.

Here, the compensation image data CDATA may be generated to be inversely proportional to the degree of deterioration of the organic light emitting diode display 100 . In other words, the compensation image data CDATA may be generated as data in which the magnitude of the data signal applied to the sub-pixel SP decreases as the degree of deterioration of the sub-pixel SP in the organic light emitting display device 100 decreases.

As described above, the deterioration compensator 150 of the present embodiment generates the compensation image data CDATA in which the luminance level of a specific region is reduced, and the timing controller 140 receives the image data RGB′ from the compensation image data CDATA. can create Accordingly, the organic light emitting display device 100 according to the present invention prevents the occurrence of luminance non-uniformity in the display panel 110 due to deterioration of the organic light emitting diode (OLED) in each sub-pixel SP of the display panel 110 . can be prevented

FIG. 4 is a diagram illustrating the configuration of the deterioration compensator shown in FIG. 3 .

3 and 4 , the degradation compensator 150 may include a lookup table compensator 151 , a reference value setter 153 , a bit adjuster 155 , and a compensator 157 .

The lookup table compensator 151 may generate and output the initial compensation data, for example, the first compensation data β.

A plurality of initial values may be stored in the lookup table compensator 151 . The lookup table compensator 151 may extract one or more initial values from among a plurality of stored initial values according to information input from the outside, for example, at least one of time information TI and stress information SI. The lookup table compensator 151 may generate and output the first compensation data, that is, the first compensation data β from the extracted initial value.

Here, the time information TI is information according to the accumulated operation time of the organic light emitting display device 100 , and the stress information SI is the organic light emitting diode OLED of each sub-pixel SP of the organic light emitting display device 100 . ) may be information on the magnitude of the driving current Id flowing in the .

The plurality of initial values stored in the lookup table compensator 151 may be values corresponding to an extended compensation range, for example, the first compensation range, and may be values expressed by N (N is a natural number) bit digital data. have. The first compensation range may range from a minimum value, for example, 0 to a maximum value, for example, 1.

In addition, the first compensation data β may be generated in the form of an exponential function that decreases in size with time within the first compensation range.

The reference value setting unit 153 may calculate the minimum value of the compensation range, for example, the minimum interval value Min, from the first compensation data β.

The reference value setting unit 153 may calculate the minimum section value Min by subtracting the first set value S_Min input from the outside from the first compensation data β. Here, as described above, the first compensation data (β) is generated in a form that decreases with time, and accordingly, the minimum interval value (Min) is also the first compensation data (β) according to time, like the first compensation data (β). It can be calculated in the form of an exponential function that decreases with the data β.

The bit adjusting unit 155 may set a compensation range of the compensation data from the minimum interval value Min. The bit adjusting unit 155 calculates the maximum range value of the compensation range by adding the second set value S_Range input from the outside to the minimum section value Min, and the range between the minimum section value Min and the maximum section value may be set as the compensation range, for example, the second compensation range.

Here, the set second compensation range may have a smaller size than the first compensation range. In addition, since the minimum section value Min decreases with time, the maximum section value calculated accordingly may also decrease with time. In this case, the second compensation range may maintain a constant section range according to the second set value S_Range.

Also, the bit adjusting unit 155 may generate the last compensation data, that is, the second compensation data β′, from the first compensation data β according to the set second compensation range. The second compensation data β′ may be generated with a smaller number of bits than the first compensation data β, and may be generated by rescaling bits of the first compensation data β. The second compensation data β′ may be expressed as digital data of M (M>N natural number) bits within the second compensation range.

Meanwhile, the second compensation data β′ may have an increased number of compensation units (resolution) compared to the first compensation data β. In other words, the number of compensation units of the second compensation data β′ is increased compared to the compensation units of the first compensation data β , and thus can be set in detail. This is because the second compensation range is set to a smaller size range than the first compensation range, and even if the second compensation data β′ is generated with a smaller number of bits than the first compensation data β, the range of the second compensation range Since is small, the second compensation data β′ may have a smaller compensation unit than the first compensation data β, that is, a fine compensation unit.

The compensator 157 may generate the compensation image data CDATA from the image signal RGB according to the second compensation data β′ generated by the bit adjuster 155 . The compensation image data CDATA may be data in which a luminance level of a specific region of the image signal RGB is reduced.

The compensation image data CDATA may be generated as data that is inversely proportional to the degree of deterioration of the organic light emitting diode display 100 . In other words, the compensation image data CDATA may be data for compensating so that the decrease in the luminance level increases as the deterioration of the sub-pixel SP of the organic light emitting diode display 100 decreases.

The compensation image data CDATA may be output to the timing controller 140 . The timing controller 140 may generate image data RGB' from the compensation image data CDATA, and output it to the data driver 130 .

As described above, the deterioration compensator 157 of this embodiment sets a second compensation range having a size range smaller than the first compensation range from the first compensation data β, and sets the first compensation range within the set second compensation range. The second compensation data β′ having a smaller number of bits than the compensation data β may be generated.

Accordingly, even if the number of bits of the second compensation data β′ decreases, the number of compensation units can be increased by the second compensation range. Compensation image data CDATA can be generated through detailed luminance compensation.

FIG. 5 is a flowchart illustrating an operation of the deterioration compensator shown in FIG. 3 .

3 to 5 , the lookup table compensator 151 of the degradation compensator 150 provides a first compensation range according to at least one of externally inputted time information TI and stress information SI. It is possible to generate and output the first compensation data β within (S10).

The lookup table compensator 151 extracts one or more initial values corresponding to time information TI or stress information SI from among a plurality of stored initial values, and from the extracted initial values, the first compensation data β can create

The first compensation data β may be expressed as N-bit digital data within a first compensation range between 0 and 1. The first compensation data β may have the form of an exponential function that decreases with time, as shown in FIGS. 6A and 6B .

The reference value setting unit 153 may calculate the minimum interval value Min of the compensation range, that is, the second compensation range to be described later by subtracting the first set value S_Min from the first compensation data β ( S20 ). .

Previously, since the first compensation data β has a form of decreasing with time, the minimum interval value Min calculated from the first compensation data β may also have a form of decreasing with time. In this case, the minimum interval value Min may have a size smaller than the first compensation data β by the first set value S_Min.

The bit adjusting unit 155 may set the second compensation range from the calculated minimum interval value Min ( S30 ). The second compensation range may be set to have a smaller size than the first compensation range.

The bit adjusting unit 155 calculates the maximum range value by adding the second set value S_Range input from the outside to the minimum range value Min, and sets the range between the minimum range value Min and the maximum range value as the second Compensation range can be set.

Meanwhile, since the minimum section value Min is reduced with time, the maximum section value can also be calculated in a form that decreases with time. In this case, the second compensation range may maintain a range equal to the second set value S_Range.

For example, as shown in FIG. 6B, if the minimum interval value Min is calculated as the maximum value (max) of the compensation data at time 0, that is, 0.8 smaller than 1, and the second set value S_Range is 0.2, The bit adjustment unit 155 calculates a maximum range value of 1.0 by adding the second set value S_Range to the minimum range value Min, and selects a range between the minimum range value Min and the maximum range value, that is, 0.8 to 1. It can be set as the second compensation range.

In this case, since the minimum section value Min is reduced with time like the compensation data, the maximum section value can also be decreased with time. However, the second compensation range may be set to change while maintaining a constant interval from the minimum interval value Min, that is, as much as the second set value S_Range.

Next, the bit adjusting unit 155 may generate the last compensation data, that is, the second compensation data β′, from the first compensation data β according to the set second compensation range ( S40 ).

The second compensation data β′ may be generated by rescaling to have a smaller number of bits than the first compensation data β. For example, when the 12-bit first compensation data β is generated and output from the lookup table compensator 151, the bit adjuster 155 rescales the bits of the first compensation data β to obtain the 8-bit second compensation data β. Compensation data β' may be generated.

Here, the number of bits of the second compensation data β′ is reduced compared to that of the first compensation data β, but the number of compensation units of the second compensation data β′ is the number of compensation units of the first compensation data β. can be further increased. This is due to the difference in the size of the compensation range, and since the second compensation data β' is generated within the second compensation range having a smaller size than the first compensation range, the compensation unit is smaller than the first compensation data β. The number can be increased, and accordingly, more detailed compensation can be performed when the luminance level is compensated using the second compensation data β′.

The compensator 157 may generate the compensation image data CDATA from the image signal RGB according to the generated second compensation data β′ ( S50 ). The compensation image data CDATA may be generated to be inversely proportional to the degree of deterioration of the organic light emitting diode display 100 , and the luminance level of the sub-pixel SP having a small degree of degradation is set to that of the sub-pixel SP having a high degree of degradation. It may be data that is reduced more than the luminance level.

As described above, in the deterioration compensator 150 of this embodiment, since the compensation range of the compensation data is adaptively adjusted and changed, the compensation performance of the compensation data can be improved compared to the prior art, and thus the compensation life is also increased. can do it

For example, as shown in FIG. 6A , in the conventional organic light emitting display device, the compensation range Range1 of compensation data is fixed and set. Accordingly, in the conventional compensation data, compensation data for luminance level compensation is generated according to a compensation unit of a predetermined size within a fixed compensation range Range1.

Also, since the conventional organic light emitting display device cannot generate compensation data using compensation data after the lowest value Min of the compensation range Range1, the actual compensation life of the compensation data is limited to the fixed compensation range Range1. becomes and decreases

However, as shown in FIG. 6B , in the organic light emitting diode display 100 of the present invention, the compensation range Range2 of the compensation data is set to change according to the compensation data. That is, since the compensation range Range2 of the present invention is not fixed and set like the conventional compensation range Range1, but changes according to the compensation data, the actual compensation life of the compensation data is the point at which the size of the compensation data becomes 0. can be increased up to

In addition, since the compensation range Range2 of the present invention is narrower than that of the conventional compensation range Range1, the number of compensation units of compensation data may be increased compared to the conventional compensation range. In other words, even when compensation data is generated with the same number of bits in the conventional and the present invention, since the compensation range Range2 of the present invention is smaller than the conventional compensation range Range1, the number of compensation data generated within the compensation range Range2 is can be increased. Accordingly, the present invention can increase the accuracy of luminance level compensation using compensation data compared to the prior art.

On the other hand, the deterioration compensator 150 of the present invention is configured to be applied to the sub-pixel SP adjacent to the sub-pixel SP having the maximum deterioration according to the degree of deterioration of each sub-pixel SP of the organic light emitting diode display 100 . Deterioration of the display panel 110 is prevented by performing a top-down luminance level compensating operation for reducing the luminance level by reducing the magnitude of the applied data signal.

However, the deterioration compensator 150 is a data signal applied to the sub-pixel SP adjacent to the sub-pixel SP having the minimum deterioration according to the degree of deterioration of each sub-pixel SP of the organic light emitting diode display 100 . Deterioration of the display panel 110 may be prevented by performing a bottom-up luminance level compensating operation for increasing the luminance level by increasing the size of .

7 is a diagram illustrating deterioration compensation of an organic light emitting display device according to the conventional compensation data, and FIG. 8 is a diagram illustrating deterioration compensation of an organic light emitting display device according to the compensation data of the present invention.

As shown in FIGS. 7A and 8A , the luminance level of each of the subpixels SP1 to SP6 of the organic light emitting diode display is deteriorated according to deterioration.

In this case, the stress according to the data signal applied to each sub-pixel SP1 to SP6 is as shown in FIGS. 7 (b) and 8 (b), and compared to the first sub-pixel SP1, the sixth Since the stress of the sub-pixel SP6 is high, the luminance level of the sixth sub-pixel SP6 is further lowered compared to the remaining sub-pixels SP1 to SP5. Here, the first sub-pixel SP1 to the sixth sub-pixel SP6 may be sub-pixels connected to the same gate line in the horizontal direction.

As shown in (c) of FIG. 7 , the conventional organic light emitting display device generates compensation data for compensating the luminance level of a sub-pixel, and generates compensation image data CDATA1 to CDATA6 from the image signal using the compensation data. can be printed out.

In this case, in the conventional organic light emitting display device, compensation data is generated within a fixed compensation range. Accordingly, the compensation unit of the compensation data may be larger than the unit of increasing the stress of each subpixel SP1 to SP6, for example, the unit of increasing the data signal.

Accordingly, as shown in FIG. 7C , in the conventional organic light emitting display device, among the plurality of compensation image data CDATA1 to CDATA6 , the first and second compensation image data CDATA1 and CDATA2 , the third and The fourth compensation image data CDATA3 and CDATA4 and the fifth and sixth compensation image data CDATA5 and CDATA6 may be generated to have the same size.

For this reason, as shown in FIG. 7D , in the conventional organic light emitting display device, among the plurality of subpixels SP1 to SP6 , the first subpixel SP1 , the third subpixel SP3 , and the fifth subpixel SP3 are used. Accurate luminance level compensation is not performed on the sub-pixel SP5, and accordingly, luminance non-uniformity of the organic light emitting display device is generated.

As shown in (c) of FIG. 8, the organic light emitting display device of the present invention generates compensation data for compensating the luminance level of a sub-pixel, and uses this to generate compensation image data CDATA1 to CDATA6 from the image signal. You can create and print it.

However, in the organic light emitting display device of the present invention, compensation data is generated within a compensation range that is adaptively changed. Accordingly, the compensation unit of the compensation data may be finely set to a size smaller than the stress increase unit of each sub-pixel SP1 to SP6.

Accordingly, as shown in FIG. 8C , in the organic light emitting display device of the present invention, a plurality of compensation image data CDATA1 to CDATA6 may be generated to have different values.

Accordingly, as shown in (d) of FIG. 8, in the organic light emitting display device of the present invention, the plurality of sub-pixels SP1 to SP6 are transmitted by a plurality of compensation image data CDATA1 to CDATA6 having different values. Since accurate luminance level compensation is performed for the luminance, luminance non-uniformity does not occur in the organic light emitting display device.

As described above, the present invention can set a compensation range that is adaptively changed according to the compensation data, and finely adjust the compensation unit of the compensation data within the set compensation range, compared to the prior art.

Accordingly, the organic light emitting display device of the present invention can increase the compensation life of the compensation data even when the compensation data is generated with the same number of bits as compared to the conventional organic light emitting display device, and increase the compensation unit of the compensation data to achieve an accurate luminance level. Compensation can be performed to prevent luminance non-uniformity from occurring.

Although many matters are specifically described in the foregoing description, these should be construed as examples of preferred embodiments rather than limiting the scope of the invention. Accordingly, the invention should not be defined by the described embodiments, but should be defined by the claims and equivalents to the claims.

100: organic light emitting display device 110: display panel
120: gate driving unit 130: data driving unit
140: timing control unit 150: deterioration compensation unit
151: lookup table compensation unit 153: reference value setting unit
155: beat adjustment unit 157: compensation unit

Claims (15)

a lookup table compensator for generating first compensation data by extracting at least one initial value from among a plurality of stored initial values according to information input from the outside;
a reference value setting unit for calculating a minimum interval value from the first compensation data according to a first setting value; and
Second compensation data having a smaller number of bits than the number of bits of the first compensation data by setting a compensation range from the minimum interval value according to a second set value and rescaling the first compensation data within the compensation range including a bit adjustment unit to generate
The number of compensation units of the second compensation data increases than the number of compensation units of the first compensation data. According to claim 1,
The information is at least one of time information and stress information of the organic light emitting display device. According to claim 1,
The reference value setting unit calculates the minimum interval value by subtracting the first set value from the first compensation data. 4. The method of claim 3,
The organic light emitting display device is calculated in a form in which the minimum section value is decreased together with the first compensation data according to time. According to claim 1,
The bit adjustment unit calculates a maximum interval value by adding the second set value to the minimum interval value,
An organic light emitting display device for setting a range between the minimum section value and the maximum section value as the compensation range. 6. The method of claim 5,
The compensation range is changed according to the first compensation data while maintaining the range of the second set value. delete According to claim 1,
and a compensator generating compensation image data for compensating a luminance level in inverse proportion to a degree of deterioration of each pixel of the organic light emitting display device from an image signal according to the second compensation data. generating first compensation data by extracting one or more initial values from among a plurality of stored initial values according to information input from the outside;
calculating a minimum section value from the first compensation data according to a first set value, and setting a compensation range from the minimum section value according to a second set value;
generating second compensation data having a smaller number of bits than the number of bits of the first compensation data by rescaling the first compensation data according to the compensation range; and
Compensating the luminance level of a specific region of the image signal according to the second compensation data to generate compensation image data,
The number of compensation units of the second compensation data increases than the number of compensation units of the first compensation data. 10. The method of claim 9,
The information is at least one of time information and stress information of the organic light emitting display device. 10. The method of claim 9,
The minimum interval value is calculated by subtracting the first set value from the first compensation data, and is decreased together with the first compensation data over time. 10. The method of claim 9,
The compensation range is set to a range between the minimum section value and the maximum section value according to a maximum section value calculated by adding the second set value to the minimum section value. 13. The method of claim 12,
and the compensation range is set to change according to the first compensation data while maintaining the range of the second set value. delete 10. The method of claim 9,
The compensation image data is generated from an image signal in a size inversely proportional to the degree of deterioration of each pixel of the organic light emitting display device according to the second compensation data.

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