KR100707635B1 - Light Emitting Display and Driving Method Thereof - Google Patents

Abstract

The present invention relates to a light emitting display device capable of minimizing power consumption.

The light emitting display device of the present invention includes a pixel portion; J blocks each of which is divided into the pixel portion and includes a plurality of pixels; A common power source commonly connected to the pixels included in the blocks; Division power supplies connected to pixels included in any one of the blocks; First switching elements respectively disposed between the split power source and the block; A frame memory for storing one frame of data supplied from the outside; And a luminance grasping unit configured to grasp the luminance of each of the blocks by using the data stored in the frame memory, and to control turn-on and turn-off of the first switching element in response to the grasped luminance.

With this configuration, the power consumption can be reduced in the present invention.

Description

Light Emitting Display and Driving Method Thereof

1 illustrates a conventional light emitting display device.

2 is a diagram illustrating a light emitting display device according to a first embodiment of the present invention.

FIG. 3 is a diagram illustrating a state in which power supplied to the second to fourth blocks shown in FIG. 2 is cut off.

4 is a diagram illustrating a light emitting display device according to a second embodiment of the present invention.

5 is a diagram illustrating a light emitting display device according to a third embodiment of the present invention.

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

210,410: Scan driver 220,422,424,426,428: Data driver

230,330,430: Pixel unit 240,340,440: Pixel

232,234,236,238,332,334,336,338: blocks

250, 450: timing controller 260, 460: frame memory

270,470: luminance grasp 480: power supply

The present invention relates to a light emitting display device and a driving method thereof, and more particularly, to a light emitting display device and a driving method thereof so as to minimize power consumption.

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, a light emitting display, and the like.

Among the flat panel display devices, the light emitting display device displays an image using a light emitting device that generates light by combining electrons and holes. Such a light emitting display device has an advantage in that it has a fast response speed and is driven with low power consumption.

1 illustrates a conventional light emitting display device.

Referring to FIG. 1, a conventional light emitting display device includes a pixel unit 30 including a plurality of pixels 40 connected to scan lines S1 to Sn and data lines D1 to Dm, and scan lines ( A timing controller for controlling the scan driver 10 for driving S1 to Sn, the data driver 20 for driving the data lines D1 to Dm, and the scan driver 10 and the data driver 20. 50 is provided.

The timing controller 50 generates a data drive control signal DCS and a scan drive control signal SCS in response to synchronization signals 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 timing controller 50 supplies the data Data supplied from the outside to the data driver 20.

The scan driver 10 receives the scan drive control signal SCS from the timing controller 50. The scan driver 10 receiving the scan driving control signal SCS generates a scan signal and sequentially supplies the generated scan signal to the scan lines S1 to Sn.

The data driver 20 receives the data drive control signal DCS from the timing controller 50. The data driver 20 receiving the data driving control signal DCS generates a data signal and supplies the generated data signal to the data lines D1 to Dm in synchronization with the scan signal.

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 is selected when a scan signal is supplied, receives a data signal, and corresponds to the supplied data signal. The light corresponding to the data signal is generated by controlling the amount of current flowing from the second power source to the second power source ELVSS via a light emitting device (not shown).

In the conventional light emitting display device, the first power source ELVDD and / or the second power source ELVSS maintain a connection with the pixels 40 regardless of an image displayed on the pixel unit 30. Here, when the first power supply ELVDD and / or the second power supply ELVSS having a predetermined voltage value are maintained in connection with the pixels 40 regardless of the image displayed on the pixel portion 30, a large amount of power consumption may be generated. A problem that is consumed occurs. The data driver 20 is also always supplied with driving power regardless of the image displayed on the pixel unit 30. As such, when driving power is continuously supplied to the data driver 20 regardless of an image displayed on the pixel unit 30, a large amount of power is consumed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light emitting display device and a driving method thereof capable of minimizing power consumption.

In order to achieve the above object, the first aspect of the present invention comprises a pixel portion; J blocks each of which is divided into the pixel portion and includes a plurality of pixels; A common power source commonly connected to the pixels included in the blocks; Division power supplies connected to pixels included in any one of the blocks; First switching elements respectively disposed between the split power source and the block; A frame memory for storing one frame of data supplied from the outside; A light emitting display device comprising a brightness grading unit configured to determine luminance of each of the blocks by using data stored in the frame memory and to control turn-on and turn-off of the first switching element in response to the determined luminance. To provide.

Preferably, the luminance grasping unit turns off the first switching element connected to the block having the predetermined luminance when at least one of the blocks has a predetermined luminance. The preset luminance is black luminance.

A second aspect of the invention is the pixel portion; J blocks each of which is divided into the pixel portion and includes a plurality of pixels; J data drivers connected to data lines formed in each of the blocks; A power supply for supplying driving power to the data drivers; Switching elements provided between each of the power supply unit and the data driver unit; A frame memory for storing one frame of data supplied from the outside; The present invention provides a light emitting display including a brightness grading unit for grasping brightness of each of the blocks by using data stored in the frame memory and controlling turn-on and turn-off of the switching elements in response to the grasped brightness. do.

Preferably, the luminance grasping unit is configured to block the supply of the driving power to at least one data driver connected to a block representing the luminance of black, and to supply the driving power to the data driver connected to another block. Control the turn-on and turn-off of the switching elements.

According to a third aspect of the present invention, there is provided a first step of dividing a pixel unit into j blocks each including a plurality of pixels (j is a natural number of two or more), and identifying luminance of each of the j blocks using data supplied from the outside. And a third step of controlling whether power is supplied to the pixels included in the blocks in response to the brightness determined in the second step.

Preferably, when the luminance of at least one specific block of the j blocks is set to black, the supply of the power is cut off to the pixels included in the specific block, and the power is supplied to the pixels included in the other blocks. To supply.

Hereinafter, preferred embodiments of the present invention may be easily implemented by those skilled in the art with reference to FIGS. 2 to 5 as follows.

2 is a diagram illustrating a light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 2, a light emitting display device according to a first embodiment of the present invention includes a pixel portion including pixels 240 formed in an intersection area of scan lines S1 to Sn and data lines D1 to Dm. 230, a scan driver 210 for driving the scan lines S1 to Sn, a data driver 220 for driving the data lines D1 to Dm, a scan driver 210 and a data driver 220. ), A timing control unit 250 for controlling the data, a frame memory 260 for storing data for one frame, and a luminance grasping for grasping the luminance of the data Data stored in the frame memory 260. The unit 270 is provided.

The timing controller 250 generates a data driving control signal DCS and a scan driving control signal SCS using a synchronization signal supplied from the outside. The data driving control signal DCS generated by the timing controller 250 is supplied to the data driver 220, and the scan driving control signal SCS is supplied to the scan driver 210. In addition, the timing controller 250 supplies the data Data supplied from the outside to the data driver 220.

The scan driver 210 receives a scan driving control signal SCS from the timing controller 250. The scan driver 210 supplied with the scan driving control signal SCS sequentially supplies the scan signals to the first scan line S1 to the nth scan line Sn.

The data driver 220 receives the data driving control signal DCS from the timing controller 250. The data driver 220 receiving the data driving control signal DCS generates a data signal and supplies the generated data signal to the data lines D1 to Dm. Here, the data signal is supplied to the data lines D1 to Dm each time the scan signal is supplied.

The pixel unit 230 is divided into at least two blocks 232, 234, 236, and 238. In FIG. 2, for convenience of description, it is assumed that the pixel unit 230 is divided into four blocks 232, 234, 236, and 238.

The pixels 240 pass through the light emitting device from one of the first divided power source ELVDD1, the second divided power source ELVDD2, the third divided power source ELVDD3, and the fourth divided power source ELVDD4 in response to the data signal. The amount of current supplied to the second power supply ELVSS2 (or the common power supply) is controlled.

Each of the first block 232 to the fourth block 238 includes a plurality of pixels. Here, the cathode electrode of the light emitting device included in each pixel 240 of each of the first block 232 to the fourth block 238 is commonly connected to the second power source ELVSS.

The pixels 240 included in each of the first block 232 to the fourth block 238 are connected to different division power sources ELVDD1 to ELVDD4. That is, in the present invention, if the pixel unit 230 is divided into j blocks (j is a natural number of 2 or more), j division power sources are also provided. In this case, the voltage values of the j divided power supplies ELVDD1 to ELVDD4 are set to be the same.

The pixels 240 included in the first block 232 are connected to the first divided power source ELVDD1. The first divided power supply ELVDD1 supplies a predetermined current to the pixels 240 included in the first block 232. Here, a first switching device SW1 controlled by the brightness grasping unit 270 is installed between the first divided power supply ELVDD1 and the pixels 240 included in the first block 232.

The pixels 240 included in the second block 234 are connected to the second divided power ELVDD2. The second divided power supply ELVDD2 supplies a predetermined current to the pixels 240 included in the second block 234. Here, a second switching device SW2 controlled by the brightness grasping unit 270 is installed between the second split power ELVDD2 and the pixels 240 included in the second block 234.

The pixels 240 included in the third block 236 are connected to the third divided power source ELVDD3. The third split power ELVDD3 supplies a predetermined current to the pixels 240 included in the third block 236. Here, a third switching device SW3 controlled by the brightness grasping unit 270 is installed between the third split power ELVDD3 and the pixels 240 included in the third block 236.

The pixels 240 included in the fourth block 238 are connected to the fourth divided power source ELVDD4. The fourth divided power supply ELVDD4 supplies a predetermined current to the pixels 240 included in the fourth block 238. Here, a fourth switching device SW4 controlled by the brightness grasping unit 270 is installed between the fourth divided power supply ELVDD4 and the pixels 240 included in the fourth block 238.

The frame memory 260 stores one frame of data Data supplied from the outside.

The brightness grasping unit 270 grasps the luminance of each block 232, 234, 236, and 238 using the grayscale value of one frame of data Data stored in the frame memory 260. The brightness grading unit 270 corresponds to the luminance of each of the blocks 232, 234, 236, and 238 so that the first switching device SW1, the second switching device SW2, the third switching device SW3, and the fourth switching device SW4 are provided. Control the turn-on and turn-off.

In detail, the luminance determiner 270 uses the grayscale value of one frame of data stored in the frame memory 260 to determine the first block 232, the second block 234, and the third block. The luminance value of the image to be displayed at 236 and the fourth block 238 is determined. Here, when the brightness of the specific block (at least one of the first to fourth blocks) is set to a preset brightness, the brightness grasping unit 270 may include at least one of the switching elements SW1 to SW4 connected to the block. Turn off.

For example, if the second block 234, the third block 236, and the fourth block 238 are set to black luminance, the brightness grasping unit 270 may have a second switching device SW2 and a third switching device. SW3 and the fourth switching device SW4 are turned off. Then, the first switching device SW1 connected to the first block 232 representing the predetermined luminance is turned on. Then, as shown in FIG. 3, a predetermined image is displayed only in the first block 232, and a black screen of the second block 234, the third block 236, and the fourth block 238 is displayed. At this time, since the second block 234, the third block 236, and the fourth block 238 are not connected to the divided power sources ELVDD2 to ELVDD4, power consumption may be reduced. That is, according to the present invention, since the pixel unit 230 is divided into j blocks and power is not supplied to a block displaying a dark screen (for example, black), power consumption can be minimized.

4 is a diagram illustrating a light emitting display device according to a second embodiment of the present invention. Referring to FIG. 4, the same drawings as in FIG. 2 are assigned the same reference numerals and detailed description thereof will be omitted.

Referring to FIG. 4, the pixel portion 330 is divided into j blocks. In FIG. 4, for convenience of description, it is assumed that the pixel unit 330 is divided into four blocks 332, 334, 336, and 338.

The pixels 340 are provided with the fifth divided power source ELVSS1, the sixth divided power source ELVSS2, and the seventh divided power source ELVSS3 from the first power source ELVDD (or the common power source) through the light emitting device in response to the data signal. ) And the amount of current supplied to any one of the eighth divided power ELVSS4. Here, the voltage values of the fifth divided power source ELVSS1, the sixth divided power source ELVSS2, the seventh divided power source ELVSS3, and the eighth divided power source ELVSS4 are set to be the same.

Each of the first block 332 to the fourth block 338 includes a plurality of pixels. Here, the pixels 340 included in the first block 332 to the fourth block 338 are commonly connected to the first power source ELVDD supplying current. The pixels 340 included in the first block 332 to the fourth block 338 are connected to different division power sources ELVSS1 to ELVSS4. Here, if the pixel unit 330 is divided into j blocks (j is a natural number of 2 or more), j division power sources are also provided. The divided power sources ELVSS1 to ELVSS4 receive a predetermined current from the first power source ELVDD via the light emitting element.

The pixels 340 included in the first block 332 are connected to the fifth split power source ELVSS1. The fifth split power ELVSS1 receives a predetermined current from the pixels 340 included in the first block 332. Here, a first switching device SW1 controlled by the brightness grasping unit 270 is installed between the fifth divided power source ELVSS1 and the pixels 340 included in the first block 332.

The pixels 340 included in the second block 334 are connected to the sixth divided power ELVSS2. The sixth split power ELVSS2 receives a predetermined current from the pixels 340 included in the second block 334. Here, a second switching device SW2 controlled by the brightness grasping unit 270 is installed between the sixth divided power ELVSS2 and the pixels 340 included in the second block 334.

The pixels 340 included in the third block 336 are connected to the seventh divided power ELVSS3. The seventh split power ELVSS3 receives a predetermined current from the pixels 340 included in the third block 336. Here, a third switching device SW3 controlled by the brightness grasping unit 270 is installed between the seventh divided power ELVSS3 and the pixels 340 included in the third block 336.

The pixels 340 included in the fourth block 338 are connected to the eighth divided power ELVSS4. The eighth divided power ELVSS4 receives a predetermined current from the pixels 340 included in the fourth block 338. Here, a fourth switching device SW4 controlled by the brightness grasping unit 270 is installed between the eighth divided power ELVSS4 and the pixels 340 included in the fourth block 338.

The brightness grasping unit 270 grasps the luminance of each block 332, 334, 336, and 338 using the grayscale value of one frame of data Data stored in the frame memory 260. The brightness grading unit 270 corresponds to the luminance of each of the blocks 332, 334, 336, and 338 so that the first switching device SW1, the second switching device SW2, the third switching device SW3, and the fourth switching device SW4 are provided. Control the turn-on and turn-off.

In detail, the brightness grasping unit 270 uses the grayscale value of one frame of data stored in the frame memory 260 to determine the first block 332, the second block 334, and the third block. In operation 336 and the fourth block 338, luminance values of the image to be displayed are determined.

Here, when the brightness of the specific block (at least one of the first to fourth blocks) is set to a preset brightness, the brightness grasping unit 270 may include at least one of the switching elements SW1 to SW4 connected to the block. Turn off.

 For example, if the brightness grasping unit 270 expresses the luminance of black in the second block 234, the third block 236, and the fourth block 238, the second switching device SW2 and the third switching device may be used. SW3 and the fourth switching device SW4 are turned off. Then, the first switching device SW1 connected to the first block 332 representing the predetermined image is turned on. Then, a predetermined image is displayed only in the first block 332, and black is displayed in the second block 334, the third block 336, and the fourth block 338. In this case, since the second block 334, the third block 336, and the fourth block 338 are not connected to the divided power sources ELVSS2 to ELVSS4, power consumption may be reduced. That is, according to the present invention, since the pixel unit 330 is divided into j blocks, and power is not supplied to a block displaying a dark screen (for example, black), power consumption can be minimized.

5 is a diagram illustrating a light emitting display device according to a third embodiment of the present invention.

Referring to FIG. 5, a light emitting display device according to a third exemplary embodiment of the present invention includes a pixel unit 430 including pixels 440, a scan driver 410, a first data driver 422, and second data. The driver 424, the third data driver 426, the fourth data driver 428, the timing controller 450, the frame memory 460, the brightness grasping unit 470, and the power supply unit 480 are provided.

The pixel unit 430 is divided into at least two blocks 432, 434, 436, and 438. In FIG. 5, for convenience of description, it is assumed that the pixel unit 430 is divided into four blocks 432, 434, 436, and 438.

Each of the pixels 440 included in each of the blocks 432, 434, 436, and 438 is connected to the first power source ELVDD and the second power source ELVSS. The pixels 440 control the amount of current supplied from the first power source ELVDD to the second power source ELVSS in response to the data signal.

The timing controller 450 generates the scan driving control signal SCS, the first data driving control signal DCS1 to the fourth data driving control signal DCS4 using the synchronization signal supplied from the outside. The scan driving control signal SCS generated by the timing controller 450 is supplied to the scan driver 410. The first data driving control signal DCS1 generated by the timing controller 450 is supplied to the first data driving unit 422, and the second data driving control signal DCS2 is supplied to the second data driving unit 424. The third data driving control signal DCS3 generated by the timing controller 450 is supplied to the third data driving unit 426, and the fourth data driving control signal DCS4 is supplied to the fourth data driving unit 428. do.

The timing controller 450 supplies the data Data supplied from the outside to the first data driver 422 to the fourth data driver 428. Here, the timing controller 450 supplies first data Data1 to be supplied to the pixels 440 included in the first block 432 to the first data driver 422, and supplies the second data to the second block 434. The second data Data2 to be supplied to the included pixels 440 is supplied to the second data driver 424. The timing controller 450 supplies third data Data3 to be supplied to the pixels 440 included in the third block 436 to the third data driver 426, and supplies the third data driver 426 to the fourth block 438. The fourth data Data4 to be supplied to the included pixels 440 is supplied to the fourth data driver 428.

The scan driver 410 receives the scan driving control signal SCS from the timing controller 450. The scan driver 410 supplied with the scan driving control signal SCS sequentially supplies the scan signals to the first scan line S1 to the nth scan line Sn.

The first data driver 422 is connected to the first data lines D11 to D1k formed in the first block 432 of the pixel unit 430. The first data driver 422 generates a data signal using the first data driving control signal DCS1 and the first data Data1, and converts the generated data signal into first data lines D11 to D1k. To supply.

The second data driver 424 is connected to the second data lines D21 to D2k formed in the second block 434 of the pixel unit 430. The second data driver 424 generates a data signal using the second data driving control signal DCS2 and the second data Data2 and converts the generated data signal into the second data lines D21 to D2k. Supply.

The third data driver 426 is connected to the third data lines D31 to D3k formed in the third block 436 of the pixel unit 430. The third data driver 426 generates a data signal using the third data driving control signal DCS3 and the third data Data3 and converts the generated data signal into the third data lines D31 to D3k. Supply.

The fourth data driver 428 is connected to the fourth data lines D41 to D4k formed in the fourth block 438 of the pixel unit 430. The fourth data driver 428 generates a data signal using the fourth data driving control signal DCS4 and the fourth data Data4 and converts the generated data signal into the fourth data lines D41 to D4k. Supply.

The power supply unit 480 supplies driving power to the first data driver 422 to the fourth data driver 428. In practice, although the power supply unit 480 supplies driving power to various circuits, in the present invention, for convenience of description, the power supply unit 480 supplies power from the power supply unit 480 to the first data driver 422 to the fourth data driver 428. Only the supply portion will be shown.

The first switch SW1 is installed between the power supply unit 480 and the first data driver 422, and the second switch SW2 is installed between the power supply unit 480 and the second data driver 424. . A third switch SW3 is installed between the power supply unit 480 and the third data driver 426, and a fourth switch SW4 is installed between the power supply unit 480 and the fourth data driver 428. do.

The frame memory 460 stores data for one frame supplied from the outside.

The brightness grading unit 470 may grasp the luminance of each block 432, 434, 436, and 438 using data of one frame stored in the frame memory 460. In addition, the brightness grasping unit 470 corresponds to the luminance of each of the blocks 432, 434, 436, and 438 so that the first switching device SW1, the second switching device SW2, the third switching device SW3, and the fourth switching device SW4. Control the turn-on and turn-off.

In detail, the brightness grasping unit 470 uses the first and second blocks 432, 432, and third blocks by using grayscale values of one frame of data stored in the frame memory 460. In operation 436 and the fourth block 438, the luminance value of the image to be displayed is determined. Herein, when the luminance of the specific block (at least one of the first to fourth blocks) is set to a preset luminance, the luminance determining unit 470 may switch the switching element (at least one of SW1 to SW4) connected to the block. Turn off.

For example, when the second block 434, the third block 436, and the fourth block 438 are set to the black luminance, the luminance detector 470 may set the second switching device SW2 and the third switching device ( SW4) and fourth switching device SW4 are turned off. Then, the first switching device SW1 connected to the first block 432 representing the predetermined luminance is turned on.

As described above, when the first switching device SW1 is turned on and the second switching device SW2 to the fourth switching device SW4 are turned off, a predetermined image is displayed in the first block 432. The black screen is displayed in the second block 434 to the fourth block 438. At this time, since power is not supplied to the second data driver 424 to the fourth data driver 428, the second data driver 424 to the fourth data driver 428 do not consume power, and thus power consumption. Can be minimized. That is, according to the present invention, since the pixel unit 430 is divided into j blocks and driving power is not supplied to the data driver connected to the block displaying the dark screen (for example, black), power consumption can be reduced.

Meanwhile, the embodiments of the present invention shown in FIGS. 2, 4 and 5 may be applied at the same time. For example, in the present invention, as shown in FIG. 5, the data driver may be provided for each block, and at the same time, the ELVDD power sources may be divided and connected to each block as shown in FIG. 2. Then, since the driving power is cut off by the data driver connected to the specific block displaying the black screen and the ELVDD power is not supplied to the pixels included in the specific block, power consumption can be further reduced.

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 light emitting display device and the driving method thereof according to the exemplary embodiment of the present invention, when the pixel unit is divided into a plurality of blocks and a black screen is displayed in at least one of the divided blocks, the pixel is supplied to the pixels. Since power supply (ELVDD and / or ELVSS) is cut off, power consumption can be minimized. In the present invention, each of the plurality of blocks is designed to be connected to different data drivers, and when the black screen is displayed in at least one black, the driving power supplied to the data drivers is cut off, thereby lowering power consumption.

Claims (15)

A pixel portion; J blocks each of which is divided into the pixel portion and includes a plurality of pixels; A common power source commonly connected to the pixels included in the blocks; Division power supplies connected to pixels included in any one of the blocks; First switching elements respectively disposed between the split power source and the block; A frame memory for storing one frame of data supplied from the outside; A light emitting display device comprising a brightness grading unit configured to determine luminance of each of the blocks by using data stored in the frame memory and to control turn-on and turn-off of the first switching element in response to the determined luminance. . The method of claim 1, And the brightness grasping unit turns off the first switching element connected to the block having the predetermined luminance when at least one of the blocks has a predetermined luminance. The method of claim 2, And the preset luminance is a black luminance. The method of claim 2, A data driver for supplying a data signal to a data line connected to the pixels; And a scan driver for supplying a scan signal to scan lines connected to the pixels. The method of claim 4, wherein Each of the pixels supplies a current supplied from the divided power to the common power in response to the data signal. The method of claim 4, wherein Each of the pixels supplies a current supplied from the common power to the divided power in response to the data signal. The method of claim 2, J data drivers for supplying data signals to data lines formed in each of the blocks; A power supply for supplying driving power to the data drivers; And a second switching element disposed in each of the power supply unit and the data driver. The method of claim 7, wherein And the brightness grasping part controls turn-on and turn-off of the second switching elements to block the supply of the driving power to the data driver connected to the block having the predetermined luminance. A pixel portion; J blocks each of which is divided into the pixel portion and includes a plurality of pixels; J data drivers connected to data lines formed in each of the blocks; A power supply for supplying driving power to the data drivers; Switching elements provided between each of the power supply unit and the data driver unit; A frame memory for storing one frame of data supplied from the outside; And a brightness grading unit for grasping brightness of each of the blocks by using data stored in the frame memory and controlling turn-on and turn-off of the switching elements in response to the grasped brightness. The method of claim 9, The brightness grading unit may be configured to block the supply of the driving power to at least one data driver connected to a block representing the luminance of black, and to supply the driving power to the data driver connected to another block. A light emitting display for controlling turn-on and turn-off. A first step of dividing the pixel portion into j blocks each of which includes a plurality of pixels (j is a natural number of two or more), A second step of grasping the luminance of each of the j blocks using data supplied from the outside; And a third step of controlling whether power is supplied to the pixels included in the blocks in response to the brightness determined in the second step. The method of claim 11, When the luminance of at least one specific block of the j blocks is set to black, the supply of the power is cut off to the pixels included in the specific block, and the power is supplied to the pixels included in the other blocks. A method of driving a light emitting display device. The method of claim 12, And the power supply supplies current to the pixels included in the specific block. The method of claim 12, And the power source is supplied with current from the pixels included in the specific block. The method of claim 12, And a data driver installed in each of the blocks, and controlling the driving power not to be supplied to the data driver included in the specific block.

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