KR20060104854A - Light emitting display and driving method for the same - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a light emitting display device and a method of driving the same, which improve the contrast ratio by controlling the amount of current flowing in the pixel portion, and which do not consume much power.

According to an embodiment of the present invention, a pixel unit includes a plurality of scan signals, a plurality of light emission control signals, and a plurality of data signals to display an image, a scan driver for transmitting the scan signal and the light emission control signal to the pixel unit; Set a correction value corresponding to the size of the data driver and the video data to receive the video data to generate the plurality of data signals to the pixel unit, and to correct the video data according to the correction value to the video data The present invention provides a light emitting display device including a luminance controller configured to generate frame data obtained by adding the summation data, and to limit the luminance of the pixel portion when the frame data is equal to or larger than a predetermined value.

Description

LIGHT EMITTING DISPLAY AND DRIVING METHOD FOR THE SAME}

1 is a structural diagram showing a light emitting display device according to the prior art.

2 is a structural diagram showing a structure of a light emitting display device according to the present invention.

3 is a graph showing a relationship between brightness of red, green, and blue and gradation data.

4A and 4B are structural diagrams showing an example of the luminance control unit employed in the light emitting display device according to the present invention.

5A to 5D illustrate a case in which the light emission ratio of the light emission signal input to the light emitting display device according to the present invention is limited to a maximum of 33%.

6A to 6D illustrate a case where the light emission ratio of the light emission signal input to the light emitting display device according to the present invention is limited to a maximum of 50%.

*** Explanation of symbols on main parts of drawings ***

100: pixel portion 110: pixel

200: luminance control unit 210: data compensation unit

220: data summing unit 230: lookup table

240: light emission control signal generator 300: data driver

400: scan driver 500: power supply

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display device and a driving method thereof, and more particularly, to provide a light emitting display device and a driving method thereof in which the brightness is limited according to the light emitting area and the amount of change in the brightness is varied according to the light emitting area.

Recently, various flat panel display devices having a smaller weight and volume than the cathode ray tube have been developed. In particular, a light emitting display device having excellent luminous efficiency, brightness, viewing angle, and fast response speed has been attracting attention.

The light emitting display includes an organic light emitting display using an organic light emitting element and an inorganic light emitting display using an inorganic light emitting element. The organic light emitting diode is also referred to as an organic light emitting diode (OLED), and includes an anode, a cathode, and an organic light emitting layer disposed therebetween to emit light by a combination of electrons and holes. The inorganic light emitting device is also referred to as a light emitting diode (LED) and, unlike an organic light emitting diode, includes an inorganic light emitting layer, for example, a light emitting layer made of a PN bonded semiconductor.

1 is a structural diagram showing a light emitting display device according to the prior art. Referring to FIG. 1, the light emitting display device according to the related art includes a pixel unit 10, a data driver 20, a scan driver 30, a controller 40, and a power supply unit 50.

In the pixel unit 10, a plurality of pixels 11 are arranged and a light emitting element (not shown) is connected to each pixel 11. And n scan lines S1, S2, ... Sn-1, Sn formed in the row direction and transmitting the scan signal, and m data lines D1, D2, forming the column direction and transmitting the data signal. M m power supplies for transmitting the first power supply (Dm-1, Dm) and the first power supply (not shown) and the second power supply ELVss having a lower potential than the first power supply (ELVdd). 2 power supply lines (not shown) are arranged. The pixel unit 10 emits light by the scan signal, the data signal, the first power source ELVdd, and the second power source ELVss to display an image.

The data driver 20 is a means for applying a data signal to the pixel unit 10. The data driver 20 is connected to the data lines D1, D2,... Dm-1, Dm of the pixel unit 10. Connected to apply a data signal to the pixel portion 10.

The scan driver 30 is a means for sequentially outputting scan signals. The scan driver 30 is connected to the scan lines S1, S2,... Pass in a line. The data signal input from the data driver 20 is applied to a specific row of the pixel unit 10 to which the scan signal is transmitted to display an image. When all rows are sequentially selected, one frame is completed.

The power supply unit 40 transmits the first power source ELVdd and the second power source ELVss having a lower potential than the first power source ELVdd and the first power source ELVdd and the second power source ELVdd to the pixel unit 10. Due to the voltage difference of ELVss, a current corresponding to the data signal flows in each pixel 10.

In the light emitting display device configured as described above, a large amount of current flows in the pixel portion 10 when high luminance is expressed, and a small amount of current flows in the pixel portion 10 when low luminance is expressed.

In this case, when high brightness is expressed, a large amount of current flows in the pixel unit 10, and a large load is applied to the power supply unit 40, so that the power supply unit 40 needs a high output, thereby greatly increasing power consumption of the light emitting display device. There is a problem that appears.

In the case of expressing low luminance, there is a problem that the brightness of the pixel portion 10 is lowered and the contrast ratio is lowered.

Accordingly, an object of the present invention is to solve the problems of the prior art, and an object of the present invention is to provide a light emitting display device and a driving method thereof in which the contrast ratio is improved by adjusting the amount of current flowing in the pixel portion and the power consumption is not high. will be.

In order to achieve the above object, a first aspect of the present invention provides a pixel unit including pixels representing a video by receiving a plurality of scan signals, a plurality of emission control signals, and a plurality of data signals, and the scan signal in the pixel unit. And a gamma correction value corresponding to the size of the data driver and video data generated by the scan driver for transmitting the light emission control signal and the video data to generate the plurality of data signals, and to transmit the pixel data. Providing a light emitting display device comprising a luminance control unit for correcting the video data according to a value to generate frame data obtained by summing the video data and limiting the luminance of the pixel unit when the frame data is greater than or equal to a predetermined value. will be.

According to a second aspect of the present invention, a pixel unit includes a pixel representing a video by receiving a plurality of scan signals, a plurality of light emission control signals, and a plurality of data signals, and adjusts the brightness of the pixel unit according to the grayscale voltage of the data signal. A luminance control unit for restricting, a scan driver for transmitting the scan signal and the light emission control signal to the pixel unit, and a data driver for generating the plurality of data signals and transmitting the video data to the pixel unit, and transmitting the video data to the pixel unit. A gamma correction value corresponding to a size is set, and the video data are corrected according to the gamma correction value to generate frame data obtained by adding the video data, and the luminance of the pixel portion is limited according to the size of the frame data. A light emitting display device having a different range is provided.

According to a third aspect of the present invention, a method of correcting video data input in one frame section according to a gamma correction value, identifying frame data that is the sum of the corrected video data, and the size of the frame data is greater than or equal to a predetermined size The present invention provides a method of driving a light emitting display device, the method comprising: limiting the luminance of the rear pixel unit and not limiting the luminance of the pixel unit when the size of the frame data is equal to or less than a predetermined size.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a structural diagram showing a structure of a light emitting display device according to the present invention. Referring to FIG. 2, the light emitting display device includes a pixel unit 100, a luminance controller 200, a data driver 300, a scan driver 400, and a power supply 500.

In the pixel unit 100, a plurality of pixels 110 are arranged and a light emitting element (not shown) is connected to each pixel 110. And n scan lines S1, S2, ... Sn-1, Sn that are formed in a row direction and transmit scan signals, and n light emission control signal lines E1, E2, ... En that transfer emission control signals. -1, En), m data lines D1, D2, .... Dm-1, Dm formed in the column direction and transmitting the data signal, and a first power source delivering the first power source ELVdd to the pixel. The line L1 and the second power line L2 for transmitting the second power source ELVss to the pixel are arranged. In this case, the second power supply line L2 is equivalently represented and may be formed in the entire area of the pixel unit 100 to be electrically connected to each pixel 110.

The luminance controller 200 outputs a luminance control signal to limit luminance so that the luminance of the pixel unit 100 representing the image does not exceed a predetermined level. The luminance of the pixel unit 100 is expressed higher than the case where the area of light emitted by the high luminance in the pixel unit 100 is large when the area of light emitted by the high luminance in the pixel unit 100 is small. For example, when the pixel unit 100 emits light in full white, the pixel unit 100 has higher luminance than otherwise. Therefore, when the area emitting light with high luminance as described above is large, the luminance is reduced to some degree. At this time, the luminance is changed according to the change of the area emitting light at a high luminance by varying the range in which the luminance is limited according to the area emitting light at a high luminance.

Therefore, the brightness controller 200 determines the size of the frame data, which is the sum of the video data signals input in one frame, and determines that the amount of current flowing to the pixel unit 100 that emits light brightly when the size of the frame data is large, and the frame data If the sum is small, it is determined that the amount of current flowing through the pixel portion 100 is small. Therefore, the luminance controller 200 outputs a luminance control signal for limiting the luminance when the size of the frame data signal is greater than or equal to a predetermined value, thereby reducing the overall brightness of the image represented by the pixel unit 100 to display the luminance control signal. .

In this case, the video data signal input to the light emitting display device is finally gamma-corrected and transferred to the pixel unit 100. Therefore, when the sum of the video data is simply transferred, the actual brightness and the brightness expressed in the video data are changed. Therefore, the luminance controller 200 corrects and sums the video data to correspond to the gamma correction value.

When the brightness of the pixel unit 100 is limited by the luminance controller 200, the amount of current flowing through the pixel unit 100 is limited, thereby eliminating the need for a high output power supply unit 500. In addition, when the luminance of the pixel unit 100 is not limited, the time for emitting the pixels to emit light is maintained for a long time, thereby increasing the luminance, thereby increasing the contrast ratio of the pixels to emit light and the pixels not to emit light. Thus, the contrast ratio of the pixel portion 100 is improved.

In this case, as a method of reducing the amount of current flowing in the pixel portion 100, when the pixel emits light, the amount of current flowing in the pixel portion 100 may be reduced by reducing the time for supplying the current.

The luminance controller 200 adjusts the pulse width of the emission control signal transmitted through the emission control signal lines E1, E2, ... En-1, En to adjust the time for which the pixel unit 100 emits light. If the pulse width is long by adjusting the light emission time to emit light in the frame, the amount of current flowing into the pixel portion 100 increases, so that the overall luminance of the pixel portion 100 does not decrease. ), The amount of current flowing in is reduced so that the overall luminance of the pixel portion 100 is lowered.

The data driver 300 is a means for applying a data signal to the pixel unit 100. The data driver 300 receives video data having red, blue, and green components to generate a data signal. The data driver 300 applies the data signal generated by being connected to the data lines D1, D2,... Dm-1, Dm of the pixel unit 100 to the pixel unit 100.

The scan driver 400 is a means for applying a scan signal and a light emission control signal to the pixel unit 100. The scan driver 400 is a scan line S1, S2, ... Sn-1, Sn and a light emission signal line E1. , E2, ... En-1, En) to transmit a scan signal and a light emission control signal to a specific row of the pixel unit 100. The data signal output from the data driver 300 is transmitted to the pixel 110 to which the scan signal is transmitted, and the pixel 110 to which the emission control signal is transmitted emits light according to the emission control signal.

The scan driver 400 may be divided into a scan driver circuit for generating a scan signal and a light emitting driver circuit for generating a light emission control signal, and the scan driver circuit and the light emitting driver circuit may be included in one component part and may be separate. It may be separated into components.

The data signal input from the data driver 300 is applied to a specific row of the pixel unit 100 to which the scan signal is transmitted, and a current corresponding to the data signal is transferred to the light emitting control signal so that the image is emitted by the light emitting device. Is displayed. At this time, if all rows are selected sequentially, one frame is completed.

The power supply unit 500 transfers the first power source ELVdd and the second power source ELVss to the pixel unit 400, and thus, the data signal of each pixel is changed by the difference between the first power source ELVdd and the second power source ELVss. Allow current to flow.

3 is a graph showing a relationship between brightness of red, green, and blue and gradation data. The horizontal axis represents gradation and the vertical axis represents luminance. Referring to FIG. 3, the red, green, and blue correction graphs R, G, and B indicating the relationship between red, green, and blue gray levels and luminance, and the reference graph Ref in which gray and luminance appear linearly Appears.

Ideally, the relationship between the gradations of red, green, and blue and luminance is expressed as a reference graph (Ref), but the video data input by gamma correction is equivalent to the correction graphs (R, G, B) of red, green, and blue. It is entered together. Therefore, the input video data has a low increase rate of luminance when the gray scale data is small, and a high increase rate of luminance when the gray scale data is high, and the luminance corresponding to the gray scale and the luminance expressed in the actual pixel portion are expressed differently. That is, the luminance actually expressed becomes brighter than the luminance represented in the gray scale.

Therefore, in the case of generating frame data obtained by adding video data, data representing a high gray level and data representing a low gray level are mixed in one frame, and thus luminance may be expressed differently by simply adding the frame data.

For example, when 0 to 63 grays are expressed, the brightness of 5 grays is 25, the brightness of 10 grays is 35, the brightness of 15 grays is 44, the brightness of 20 grays is 52, and the brightness of 25 grays is 60. Brightness of 30 gray levels, 68, 35 gray levels, 90, 40 gray levels, 110, 45 gray levels, 145, 50 gray levels, 190, 55 gray levels, 250, 63 gray levels, 300 When the assumption is made, each gray level of a pixel represented in one frame represents 5, 5, 5, 5, 5, 15, 15, 20, 55, 55, 63, 63 gray levels, and is expressed in another frame. If each gray level of the pixel represents 15, 15, 25, 25, 25, 30, 35, 40, 45, 45, 45, the sum of the grays of the first frame is 321 grays and the sum of the grays of the second frame represents 345 grays. . Therefore, the first frame should be darker than the second frame. However, when looking at the sum of the luminance, the sum of the luminance of the first frame represents 1365 and the sum of the luminance of the second frame represents 971, and the actual representation of the first frame is brighter than that of the second frame. Therefore, the brightness of the pixel unit 100 may not be determined by simply summing the gray scale values.

4A and 4B are structural diagrams showing an example of the luminance control unit employed in the light emitting display device according to the present invention. 4A illustrates that the luminance controller includes a red, blue, and green lookup table, and FIG. 4B illustrates that the luminance controller includes one of the red, blue, and green lookup tables. 4A and 4B, the luminance controller 200 includes a data compensator 210, a data summing unit 220, a lookup table 230, and a luminance control driver 240.

The data compensator 210 receives and corrects video data including red, green, and blue data, and stores a data corresponding to the gray level of the video data in order to eliminate problems as shown in FIG. 3. It is provided.

The lookup table includes grayscale values of video data, and includes a lookup table 211, a green lookup table 212 storing data corresponding to the gray level of green video data, and a blue color storing data corresponding to the gray level of blue video data. The lookup table 213 is included. The red, green, and blue lookup tables store grayscale correction values corresponding to the respective video data to grasp input video data, and output video data corrected by the grayscale correction values.

In this case, referring to the graph shown in FIG. 3, the red, green, and blue correction graphs do not have much difference, and thus, the red, green, and blue lookup tables as shown in FIG. As shown in FIG. 1, one of the red, green, and blue video lookup tables 215 may be provided to correct video data.

A red lookup table 211 storing data corresponding to the gray level of the red video data, a green lookup table 212 storing data corresponding to the gray level of the green video data, and data corresponding to the gray level of the blue video data Blue lookup table 213 is included. The red, green, and blue lookup tables store grayscale correction values corresponding to the respective video data to grasp input video data, and output video data corrected by the grayscale correction values.

The data summing unit 220 extracts information on frame data obtained by summing video data having information on red, blue, and green input to one frame corrected by the data compensator 210. In the frame data, all the video data for one frame are summed up. If the data value of the frame data is large, the data includes a lot of high grays. If the data value of the frame data is small, the data of the high grays is small. It can be seen that.

The lookup table 230 designates the width of the light emission section of the light emission control signal according to the data value of the frame data. The width of the light emitting section is specified using the upper bits of the frame data. By using the upper five bits of the frame data to determine the degree of brightness of the pixel unit 100 in one frame.

As the size of the frame data increases, the luminance of the pixel unit 100 gradually increases, and the luminance of the pixel unit 100 is limited when the luminance of the pixel unit 100 reaches a predetermined brightness or more. In addition, as the luminance of the pixel unit 100 increases, a ratio that is gradually limited is further increased to prevent an excessive increase in the luminance of the pixel unit 100.

At this time, if the luminance is uniformly limited in accordance with the increase in the luminance of the pixel portion 100, the luminance of the pixel portion 100 may be excessively limited by the limitation of the luminance when the luminance is very high. It doesn't provide a bright screen and simply drops the overall brightness. Therefore, by setting a range that limits the luminance to the maximum, a range that is limited when the entire pixel portion 100 represents white is prevented from falling below a range that limits the luminance limitation of the pixel portion 100.

At this time, the image displayed in the light emitting display device is classified into a case of a still image and a case of a moving image, and thus the restriction range is changed according to the type of image.

If the size of the frame data does not exceed the predetermined size, the luminance is not limited. If the luminance is not high, the luminance is not limited.

Table 1 shows the lookup table 230 in which the emission ratio is limited to 50% of the maximum value according to the luminance of the pixel unit 100.

High 5 bit value Emission rate Luminous rain Luminance Light emission control signal width 0 0% 100% 300 325 One 4% 100% 300 325 2 7% 100% 300 325 3 11% 100% 300 325 4 14% 100% 300 325 5 18% 100% 300 325 6 22% 100% 300 325 7 25% 100% 300 325 8 29% 100% 300 325 9 33% 100% 300 325 10 36% 100% 300 325 11 40% 99% 297 322 12 43% 98% 295 320 13 47% 96% 287 311 14 51% 93% 280 303 15 54% 89% 268 290 16 58% 85% 255 276 17 61% 81% 242 262 18 65% 76% 228 247 19 69% 72% 217 235 20 72% 69% 206 223 21 76% 65% 196 212 22 79% 62% 186 202 23 83% 60% 179 194 24 87% 57% 172 186 25 90% 55% 165 179 26 94% 53% 159 172 27 98% 51% 152 165 28 - - - - 29 - - - - 30 - - - - 31 - - - -

Table 1 is preferably applied when the image is a still image. The luminance is not limited when the emission rate of the pixel unit 100 is 36% or less, and the luminance is applied when the emission area ratio exceeds 36%. If the area that emits light at the maximum brightness is increased, the ratio of limiting the brightness is also increased. In this case, the emission rate is a variable determined by Equation (1).

In order to prevent the brightness from being excessively limited, the maximum limiting ratio is set to 50% so that even if most of the pixels in the pixel portion 100 emit light at the maximum brightness, the ratio limiting the luminance does not become 50% or less.

 Table 2 shows the lookup table 230 in which the emission ratio is limited to 33% of the maximum value according to the luminance of the pixel unit 100.

High 5 bit value Emission rate Luminous rain Luminance Light emission control signal width 0 0% 100% 300 325 One 4% 100% 300 325 2 7% 100% 300 325 3 11% 100% 300 325 4 14% 100% 300 325 5 18% 99% 298 322 6 22% 98% 295 320 7 25% 95% 285 309 8 29% 92% 275 298 9 33% 88% 263 284 10 36% 83% 250 271 11 40% 79% 237 257 12 43% 75% 224 243 13 47% 70% 209 226 14 51% 64% 193 209 15 54% 61% 182 197 16 58% 57% 170 184 17 61% 53% 160 173 18 65% 50% 150 163 19 69% 48% 143 155 20 72% 45% 136 147 21 76% 43% 130 141 22 79% 41% 124 134 23 83% 40% 119 128 24 87% 38% 113 122 25 90% 36% 109 118 26 94% 35% 104 113 27 98% 34% 101 109 28 - - - - 29 - - - - 30 - - - - 31 - - - -

Table 2 is preferably applied when the video is a moving image. If the emission rate is less than 34%, the luminance is not limited. If the emission rate is more than 34%, the area emitting light at the maximum luminance is limited. Increasing will also increase the rate of limiting luminance. In order to prevent the brightness from being excessively limited, the maximum limiting ratio is set to 33% so that even if most of the pixels of the pixel portion 100 emit light at the maximum brightness, the rate limiting luminance is not lower than 33%.

The luminance control driver 240 receives the upper five bit values of the frame data and outputs a luminance control signal. The luminance control signal is input to the scan driver 400 to control the scan driver 400 to output the light emission control signal according to the luminance control signal from the scan driver 400. In particular, when the scan driver 400 is divided into a scan driver circuit and a light emission control circuit, the brightness control signal is input to the light emission control circuit and outputs a light emission control signal according to the brightness control signal.

In the light emission control signal, the maximum light emission period is set to 325. Therefore, 8 bits can represent 256 types and 9 bits can represent 512 types. Therefore, in order to generate light emitting sections of the light emitting control signals shown in Table 1, it is preferable that the luminance control signals output 9 bits of signals. Do. The luminance control signal may use a start pulse, and the width of the emission control signal may be determined according to the change in the width of the start pulse.

5A to 5D illustrate a case in which the light emission ratio of the light emission signal input to the light emitting display device according to the present invention is limited to a maximum of 33%. Fig. 5A shows the relationship between the calculated luminance ratio and the luminance ratio mathematically, and Fig. 5B shows the measured values of the luminance ratio and the luminance ratio actually measured. 5C shows the relationship between the calculated light emission area and the current ratio, and FIG. 4D shows the relationship between the actual measured light emission area and the current ratio.

Referring to FIGS. 5A and 5B, when the light emission rate is within about 30%, the luminance is maintained at a constant level so that the screen does not become dark, and when the light emission rate is about 30% or more, the brightness is gradually decreased and expressed too brightly. To prevent glare.

Referring to FIGS. 5C and 5D, when the brightness is not limited, the current flows from about 30 to 35% of the amount of current flowing when the brightness is not limited, thereby reducing the load on the power supply 500. The supply unit 500 does not require high output.

6A to 6D illustrate a case where the light emission ratio of the light emission signal input to the light emitting display device according to the present invention is limited to a maximum of 50%. Fig. 6A shows the relationship between the calculated luminance ratio and the luminance ratio mathematically, and Fig. 6B shows the measured values of the luminance ratio and the luminance ratio actually measured. 6C shows the relationship between the calculated light emission rate and the current ratio, and FIG. 6D shows the relationship between the measured light emission rate and the current ratio.

Referring to FIGS. 6A and 6B, when the emission rate is within about 40%, the luminance is maintained at a constant level so that the screen does not become dark. When the emission rate is about 40% or more, the brightness is gradually decreased to be too bright. The glare can be prevented by preventing the expression

Referring to FIGS. 6C and 6D, when the brightness is not limited, the amount of current flows to about 50% of the amount of current flowing when the brightness is not limited, thereby reducing the load on the power supply 500 to reduce the load on the power supply unit ( 500) does not require high power.

While preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. You must lose.

According to the light emitting display device and the driving method thereof according to the present invention, it is possible to reduce the power consumption by limiting the flow of current in accordance with the light emission rate of the light emitting display device and to improve the contrast ratio of the image.

Claims (14)

A pixel unit including pixels representing an image by receiving a plurality of scan signals, a plurality of emission control signals, and a plurality of data signals; A scan driver transferring the scan signal and the emission control signal to the pixel unit; A data driver configured to receive video data and generate the plurality of data signals and transmit the plurality of data signals to the pixel unit; And Set a correction value corresponding to the size of the video data, and correct the video data according to the correction value to generate the frame data obtained by summing the video data, and if the frame data is more than a predetermined value, the luminance of the pixel portion A light emitting display device comprising a brightness control unit for restricting. A pixel unit including a pixel representing an image by receiving a plurality of scan signals, a plurality of emission control signals, and a plurality of data signals; A luminance control unit for limiting luminance of the pixel unit in accordance with the gray voltage of the data signal; A scan driver for transmitting a scan signal and the emission control signal to the pixel unit; And A data driver configured to receive video data and generate the plurality of data signals and transmit the plurality of data signals to the pixel unit; Set a correction value corresponding to the size of the video data, correct the video data according to the correction value to generate frame data obtained by adding the video data, and the luminance of the pixel portion is limited according to the size of the frame data. The light emitting display device is set to a different range. The method according to claim 1 or 2, The brightness control unit A data correction unit for setting the correction value corresponding to the video data and correcting the video data corresponding to the correction value; A data summing unit for generating the frame data by summing video data corresponding to one frame section compensated by the data compensating unit; A lookup table for storing light emission information on a light emission time of the pixel according to the frame data; And And a brightness control driver for transmitting a brightness control signal for controlling the light emission control signal according to the light emission information. The method of claim 3, wherein The correction value is a light emission for correcting the video data by increasing the size of the video data when the video data expresses a low gray scale and by reducing the size of the video data when the video data expresses a high gray scale. Display. The method of claim 3, wherein The data compensation unit A red lookup table storing a correction value corresponding to the red gray voltage; A green lookup table that stores a correction value corresponding to the green gradation voltage; And A light emitting display device comprising a blue lookup table that stores a correction value corresponding to a blue gray scale voltage. The method of claim 3, wherein The data compensation unit And a look-up table for storing correction values corresponding to one of the red gray voltage, the green gray voltage, and the blue gray voltage. The method according to claim 1 or 2, And the scan driver is configured to receive the luminance control signal and generate the emission control signal. The method of claim 7, wherein The scan driver is divided into a scan driver circuit for transmitting the scan signal and a light emission control driver circuit for transmitting the light emission control signal. The method according to claim 1 or 2, And a power supply unit configured to transfer driving power to drive the pixel unit. Correcting video data input in one frame section according to a set correction value; Identifying frame data that is a sum of the corrected video data; And And limiting the luminance of the pixel portion if the size of the frame data is greater than or equal to a predetermined size, and not limiting the luminance of the pixel portion if the size of the frame data is less than or equal to the predetermined size. The method of claim 10, And a light emitting period in which the pixel portion emits light is determined according to the size of the frame data. The method of claim 11, And determining a light emission time during which the pixel unit emits light using a look-up table in which the light emission section corresponding to the frame data is stored. The method of claim 10, And the gamma correction value is a gamma correction value for red, green, and blue data. The method of claim 10, And the gamma correction value is one of gamma correction values for red, green, and blue data.

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