KR20150082946A - Organic Light Emitting Display Apparatus and Driving method thereof - Google Patents

Abstract

The present invention provides an organic light emitting display device and a driving method thereof. The organic light emitting display device according to the present invention may comprise: a display unit including first pixels having a plurality of sub light emitting elements and second pixels formed by at least one sub light emitting element separated from the sub light emitting elements; and a signal processing unit dividing one frame into a plurality of sub fields and a dummy sub field, setting the sum of a light emitting period of each sub field as a light emitting period of the dummy sub field and generating a data signal for expressing gradation with light emitting time according to selective light emission of the sub light emitting elements during the light emitting period.

Description

[0001] The present invention relates to an organic light emitting display device,

The present invention relates to an organic light emitting display and a driving method thereof.

When a defect occurs in a specific pixel, a certain pixel can always generate light irrespective of a scan signal and a data signal. In this way, a pixel in which light is always generated in a pixel is recognized as a bright spot (or bright spot) to an observer, and this bright spot is easily observed by an observer because of its high visibility.

The organic light emitting display device has a complicated pixel circuit and a complicated manufacturing process. Therefore, there arises a problem that yield increases due to defective pixels as the size increases and the resolution increases.

An embodiment of the present invention is to provide a digital driving organic light emitting display device and a driving method in which a defective defective pixel can be driven with a normal luminance.

An organic light emitting display according to an embodiment of the present invention includes a display unit including a first pixel including a plurality of sub-luminous elements and a second pixel from which at least one of the plurality of sub-luminous elements is separated; And one frame is divided into a plurality of subfields and a dummy subfield, a sum of light emission periods of each of the plurality of subfields is set as a light emission period of the dummy subfield, and in the light emission period, And a signal processing unit for generating a data signal for expressing the gray level as the light emission time according to the light emission.

Wherein the signal processing unit extracts a gray level of the first pixel and a second pixel from video data of a frame unit and allocates a bit to each of the plurality of subfields and the dummy subfields to convert the extracted gray level into digital data An A / D converter; And a correction unit that corrects the digital data of the second pixel so that the light emission time of the second pixel is twice the light emission time of the first pixel that expresses the same gray level.

The dummy subfield of the first pixel may be a non-light emitting subfield displaying black.

The dummy subfield of the second pixel may be a light emitting subfield according to a gray level or a non-light emitting subfield displaying black.

The number of gray scales that can be implemented by the display unit may be 2 ^x (x = the number of subfields excluding dummy subfields).

The dummy subfield may follow the plurality of subfields, and the most significant bit of the data signal may be allocated.

Each of the sub-luminous elements includes a first electrode connected to a pixel circuit; A second electrode facing the first electrode; And a light emitting layer between the first electrode and the second electrode.

The pixel circuit includes: a first transistor that is turned on by a scan signal applied to a scan line and transfers the data signal to the data line; A second transistor whose turn-on is controlled according to a logic level of the data signal; And a capacitor for storing a voltage corresponding to the data signal.

The organic light emitting diode display includes a scan driver for applying a scan signal to scan lines for each of the plurality of subfields and the dummy subfields; And a data driver for applying the data signal to the first pixel and the second pixel in response to the scan signal.

The OLED display according to an embodiment of the present invention includes a first pixel including a plurality of sub-luminous elements and a second pixel from which at least one of the plurality of sub-luminous elements is separated, Includes the steps of: dividing one frame into a plurality of subfields and a dummy subfield; And a data signal for generating a data signal for expressing a gray level as a light emission time corresponding to selective emission of the sub-light emitting element in the light emission period is set in a light emission period of the dummy subfield in each of the plurality of subfields Step.

The data signal generation step may include: extracting a gray level of the first pixel and a second pixel from image data of a frame unit; Assigning bits to each of the plurality of subfields and dummy subfields to convert the extracted gray levels into digital data; And correcting the digital data of the second pixel so that the light emission time of the second pixel is twice the light emission time of the first pixel representing the same gray level.

The dummy subfield of the first pixel may be a non-light emitting subfield displaying black.

The dummy subfield of the second pixel may be a light emitting subfield according to a gray level or a non-light emitting subfield displaying black.

The number of gray scales that can be implemented by the organic light emitting display device may be 2 ^x (x = the number of subfields excluding dummy subfields).

The dummy subfield may follow the plurality of subfields, and the most significant bit of the data signal may be allocated.

Each of the sub-luminous elements includes a first electrode connected to a pixel circuit; A second electrode facing the first electrode; And a light emitting layer between the first electrode and the second electrode.

The pixel circuit includes: a first transistor that is turned on by a scan signal applied to a scan line and transfers the data signal to the data line; A second transistor whose turn-on is controlled according to a logic level of the data signal; And a capacitor for storing a voltage corresponding to the data signal.

The driving method may further include: applying scan signals to the plurality of subfields and the dummy subfields with a scan line; And applying the data signal to the first pixel and the second pixel in response to the scan signal.

Embodiments of the present invention can provide a display device having excellent display quality of a screen by improving the luminance deviation by emitting a normal pixel of a repaired pixel when a defective pixel is generated.

1 is a block diagram schematically showing a display device according to an embodiment of the present invention.
2 is a circuit diagram showing a normal pixel according to an embodiment of the present invention.
3 is a schematic view of a repair pixel according to an embodiment of the present invention.
4 is a timing chart for explaining the driving method of the display device shown in Fig.
5 and 6 are timing charts for explaining another driving method of the display device shown in FIG.
7 and 8 are views schematically showing one frame of a display device according to an embodiment of the present invention.
9 is a block diagram schematically showing a configuration of a signal processing unit according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning. Also, in the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

1 is a block diagram schematically showing a display device according to an embodiment of the present invention.

1, a display device 100 according to an exemplary embodiment of the present invention includes a display panel 110, a controller 120, a scan driver 140, a data driver 150, and a power supplier 160 . The control unit 120, the scan driver 140, and the data driver 150 may be formed in the form of separate integrated circuit chips or one integrated circuit chip and may be directly mounted on the display panel 110, the display panel 110 may be mounted on a printed circuit film or may be attached to the display panel 110 in the form of a tape carrier package (TCP), mounted on a separate printed circuit board, .

A plurality of pixels PX connected to the scanning lines SL1 to SLn and the data lines DL1 to DLm are arranged in the display region of the display panel 110. [ The pixel PX may be a red pixel emitting red light, a green pixel emitting green light, or a blue pixel emitting blue light. However, the embodiment of the present invention is not limited to pixels emitting red, blue, and green colors, and the display panel 110 may be provided with pixels that emit white or other colors other than red, blue, and green. The pixel PX is connected to a power supply line PL for supplying a first power supply voltage ELVDD. When the first power source voltage ELVDD having a different size is supplied for each pixel PX, the power source line PL may be connected to a separate power line PL for each pixel PX. The pixel PX may include a normal pixel PXnor and a repair pixel PXerr whose defect is repaired.

The control unit 120 may include a signal processing unit 130. The signal processor 130 may receive the image data of the pixels PX of one frame to extract the gray levels of the pixels PX and convert the extracted gray levels into digital data of a predetermined predetermined number of bits. Accordingly, the data driver 150 can provide each bit included in the digital data to each pixel PX as a data signal D for each subfield.

One frame is composed of a plurality of subfiles and dummy subfields. In each subfield, a light emission period (display duration time) is determined according to a set weight value. The dummy subfield has a sum of light emission periods of each of a plurality of subfields as a light emission period. In an embodiment of the present invention, one frame may be composed of X subfields of the first to Xth and (X + 1) th dummy subfields. The bits corresponding to the first logic level and the second logic level are assigned to the X subfields and one dummy subfield, respectively. And the most significant bit (MSB) is allocated to the (X + 1) -th dummy subfield. The number of gray scales R is related to the number of subfields except the dummy subfield, and can be expressed by R = 2 ^x (x = number of subfields).

The controller 120 generates a scan control signal and a data control signal and transmits the scan control signal and the data control signal to the scan driver 140 and the data driver 150, respectively.

The scan driver 140 can generate and supply the scan signal S to the pixel PX through the plurality of scan lines SL1 to SLn at a predetermined timing in each of the subfield and dummy subfield in accordance with the scan control signal.

The data driver 150 applies a data signal D having a logic level of either a first logic level or a second logic level to each of the pixels PX through a plurality of data lines DL1 to DLm in accordance with a data control signal, Can be provided. The first logic level and the second logic level may be high level and low level, respectively. Alternatively, the first logic level and the second logic level may be low level and high level, respectively.

The display apparatus 100 selectively emits light emitting elements included in each pixel PX based on the logic level of the data signal D provided from the data driver 150 for each subfield and / The gradation can be displayed by adjusting the light emitting time of the light emitting element within the frame. Each pixel PX emits a light emitting element during a corresponding sub-field (or dummy sub-field) period when a low-level data signal is received. When a high-level data signal is received, The light emitting element can be turned off during the period. Alternatively, each pixel PX emits a light emitting element during a corresponding sub-field (or dummy sub-field) period when receiving a high-level data signal, and when receiving a low-level data signal, Field) period of the light emitting element.

The power supply unit 160 receives an external power supply and / or an internal power supply, converts the power supply voltage into various voltages required for operation of the respective components, (110). The power supply unit 160 may use a DC-DC converter.

The power supply unit 160 may supply the first power supply voltage ELVDD and the second power supply voltage ELVSS to the pixel PX of the display panel 110. [ The first power source voltage ELVDD may be a predetermined high level voltage and the second power source voltage ELVSS may be a voltage lower than the first power source voltage ELVDD or a ground voltage. The power supply unit 160 may supply the first power voltage ELVDD of different sizes for the red pixel, the green pixel, and the blue pixel.

Although the signal processor 130 is included in the controller 120, the signal processor 130 may be a separate component or may be included in the data driver 150 to perform the same function.

2 is a circuit diagram showing a normal pixel according to an embodiment of the present invention.

Referring to FIG. 2, the pixel PXnor includes a pixel circuit PC and a light emitting element PE connected to the pixel circuit PC to emit light.

The pixel circuit PC may include at least one thin film transistor and at least one capacitor.

The light emitting device PE may be an organic light emitting diode (OLED) including an anode electrode, a cathode electrode, and a light emitting layer between the anode electrode and the cathode electrode. The anode electrode of the light emitting element PE may be divided into a plurality of parts, and the light emitting element may be composed of a plurality of sub-light emitting elements. 2 shows an example in which the anode electrode is divided into two, and the light emitting element PE is composed of two first sub-light-emitting elements PE1 and a second sub-light-emitting element PE2. The cathode electrodes of the first and second sub-light-emitting devices PE1 and PE2 may be a common electrode formed on the entire surface of the substrate. The pixel PXnor is connected to the voltage line PL for supplying the first power source voltage ELVDD.

More specifically, the pixel PXnor includes a pixel circuit PC having two transistors Ts and Td and one capacitor Cst and a light emitting element PE connected to the pixel circuit PC. The light-emitting element PE includes a first sub-light-emitting element PE1 and a second sub-light-emitting element PE2.

The first transistor Ts has a gate electrode connected to the scan line SL and a first electrode connected to the data line DL and a second electrode connected to the gate electrode of the second transistor Td. The first transistor Ts transfers the data signal D supplied to the data line DL to the gate electrode of the second transistor Td when the scan signal is applied to the gate electrode of the first transistor Ts.

The second transistor Td has a gate electrode connected to the second electrode of the first transistor Ts and a first electrode connected to the voltage line PL to receive the first power source voltage ELVDD, Emitting element PE1 and the second sub-light-emitting element PE2. The second transistor Td is turned on according to the logic level of the data signal D applied to the gate electrode. When the second transistor Td is turned on, the first power source voltage ELVDD is applied to the first sub- To the respective anode electrodes of the element PE2.

The first electrode of the capacitor Cst is connected to the second electrode of the first transistor Ts and the gate electrode of the second transistor Td and the second electrode of the capacitor Cst is connected to the voltage line PL, ). The capacitor Cst may store a voltage corresponding to the data signal D. [

The first sub-light-emitting device PE1 and the second sub-light-emitting device PE2 each have a first electrode, a second electrode facing the first electrode, an organic light-emitting diode (OLED) including a light-emitting layer between the first electrode and the second electrode OLED). The first electrode and the second electrode may be an anode electrode and a cathode electrode, respectively. The anode electrode is connected to the second electrode of the second transistor Td, and the cathode electrode receives the second power voltage ELVSS.

3 is a schematic view of a repair pixel according to an embodiment of the present invention.

If the light emitting element of the pixel PX is defective, it can be visually recognized as a bright spot. Therefore, in the embodiment of the present invention, the defective sub-light-emitting elements among the plurality of sub-light-emitting elements are dark-ignited and the remaining sub-light-emitting elements are displayed with gradations to repair defective pixels so as not to be recognized as bright spots.

The embodiment of Fig. 3 shows a repair pixel PXerr in which the defective second sub-light-emitting element PE2 is fired. The anode electrode of the second sub-luminous element PE2 which is defective is separated from the second transistor Td of the pixel circuit PC by cutting (CUT).

In the repair pixel PXerr, the total area of the anode electrode can be reduced by ignition of the second sub-luminous element PE2. If the area of the first sub-light-emitting element PE1 and the area of the second sub-light-emitting element PE2 are the same, the area of the anode electrode is reduced to half, so that the total area of the light-emitting element of the repair pixel PXerr is reduced. The resistance is increased. Accordingly, the driving current flowing through the first sub-light-emitting element PE1 is reduced, and the brightness of the repair pixel EPerr is reduced.

In the embodiment of the present invention, the data signal D can be corrected so that the light emitting time of the repair pixel PXerr is greater than the original light emitting time so that the repair pixel PXerr can emit light with normal brightness. For example, the data signal D can be corrected to have a light emission time twice that of the original light emission time. As a result, the repair pixel PXerr can emit light at the same luminance as that at the normal state.

4 is a timing chart for explaining the driving method of the display device shown in Fig.

Referring to FIG. 4, the display apparatus 100 of the present invention can drive one frame 1F divided into a plurality of first to eighth subfields SF1 to SF8 and a dummy subfield DSF. Each of the first to eighth subfields SF1 to SF8 and the dummy subfield DSF may be divided into a scanning period and a light emitting period.

A scanning signal is sequentially supplied to the scanning lines SL1 to SLn between the syringes. As the scanning signals S are sequentially supplied, the pixels PX are selected on a horizontal line (row) basis. At this time, the data signal D is supplied to the pixels PX selected by the scan signal.

In the light emitting period, the pixels PX emit light or no light corresponding to the data signal supplied in the scanning period.

5 and 6 are timing charts for explaining another driving method of the display device shown in FIG.

Referring to FIGS. 5 and 6 together, the first to n th scanning lines SL1 to SLn are controlled. One frame 1F may include a plurality of first to eighth subfields SF1 to SF8 and a dummy subfield DSF. Each of the first to eighth subfields SF1 to SF8 and the dummy subfield DSF may be divided into a scanning period TA and a light emitting period TE.

The selection timing of each scanning line is delayed by one unit time (TU) from the selection timing of the previous scanning line for each of the subfields SF1 to SF8 and the dummy subfield DSF. One unit time TU corresponds to the number of subfields and dummy subfields, that is, the sum of nine scanning periods TA. That is, the scanning period TA corresponds to a time obtained by dividing the unit time TU by the number of the subfields and the dummy subfields.

When the data signal D is supplied to the pixel PX of the selected horizontal line corresponding to the scanning signal in the scanning period TA, the pixel PX emits light or does not emit light for the emission period TE.

5 and 6, the scan signals are not sequentially supplied to the first to the n-th scan lines SL1 to SLn, the scan lines are selected in the predetermined order for one unit time TU, . The driving according to the embodiment of FIGS. 5 and 6 can shorten the scanning period and maximize the light emission period as compared with the embodiment of FIG.

7 and 8 are views schematically showing one frame of a display device according to an embodiment of the present invention.

Hereinafter, the driving of the display device will be described as an example in which one frame is composed of eight subfields and one dummy subfield, and bits are assigned to each subfield and dummy subfield. The first to eighth subfields SF1 to SF8 are subfields for gradation display of the normal pixel PXnor and the dummy subfield DSF is an additional subfield for gradation display of the repair pixel PXerr.

The bits corresponding to the first logic level or the second logic level are allocated to the first to eighth subfields SF1 to SF8, respectively. In each of the first to eighth subfields SF1 to SF8, a light emission period (display duration time) is determined according to a set weight value.

The lengths of the emission periods of the first to eighth subfields SF1 to SF8 can be set corresponding to the binary weight of the corresponding subfield. For example, when the weight of the first subfield SF1 is set to 2 ⁰ and the weight of the second subfield SF2 is set to 2 ¹ , the weight is 2 ⁿ (n = 0, ¹ , 2 , 3, 4, 5, 6, 7) of the first to eighth subfields SF1 to SF8. A frame of such a structure can implement a total of 256 (= 2 ⁸ ) gradations from the 0th gradation to the 255th gradation according to the combination of the light emission periods.

In the dummy subfield (DSF), the bit corresponding to the first logic level or the second logic level is allocated as the most significant bit (MSB).

The length of the light emission period of the dummy subfield DSF may be set equal to the sum of the lengths of the light emission periods of the first to eighth subfields SF1 to SF8. For example, the length of the light emission period of the ninth subfield SF9 may be set to (2 ⁰ + 2 ¹ + ² 2 + ^{2 3} +2 ⁴ +2 ⁵ +2 ⁶ + 2 ⁷ ).

In the case of the normal pixel PXnor, a bit for turning off the light emitting element is assigned to the dummy subfield DSF. That is, the normal pixel PXnor is divided into eight bits allocated to the first to eighth subfields SF1 to SF8, excluding the most significant bit (MSB) assigned to the dummy subfield SF9 among the nine bits The gradation can be displayed.

In the case of the repair pixel PXerr, eight bits allocated to the first to eighth subfields SF1 to SF8 and nine bits including the most significant bit MSB allocated to the dummy subfield SF9, Can be displayed.

7 (a), the normal pixel PXnor is divided into the first subfield SF1 to the eighth subfield SF1, and the second subfield SF1 to the eighth subfield SF1, for example, when the normal pixel PXnor implements the maximum gradation, (SF8), and emits no light during the dummy subfield (DSF). That is, a data signal for turning on the light emitting element of the normal pixel (PXnor) is supplied during the scanning period of each of the first subfield (SF1) to the eighth subfield (SF8), and the light emitting element have. During the scanning period of the dummy subfield DSF, the data signal for turning off the light emitting element of the normal pixel PXnor is supplied, so that the light emitting element can emit no light during the subsequent light emitting period. Thus, the normal pixel PXnor can display the 255th gradation.

On the other hand, in order for the repair pixel PXerr to display the same gray level as that of the normal pixel PXnor, the repair pixel PXerr must emit light twice as much as the emission time of the normal pixel PXnor.

7 (b), the repair pixel PXerr is divided into the first subfield SF1 to the eighth subfield SF8 and the dummy pixel PXerr. In the case where the repair pixel PXerr implements the 255th gray level, And emits light during the subfield (DSF). That is, a data signal for turning on the light emitting element of the repair pixel PXerr is supplied during the scan periods of the first subfield SF1 to the eighth subfield SF8 and the dummy subfield DSF, The 255th gradation can be displayed by causing the light emitting element to emit light.

That is, in order for the repair pixel PXerr to realize the maximum gradation, the dummy sub-field DSF is set to the light emission sub-field so as to emit light at twice the light emission time of the normal pixel PXnor, .

8A, the normal pixel PXnor emits light during the first subfield SF1 and the second subfield SF2, and the normal pixel PXnor emits light during the first subfield SF1 and the second subfield SF2, And emits no light during the remaining third to eighth subfields SF8 to SF9 and the dummy subfield DSF. Thus, the normal pixel PXnor can display the third gradation.

On the other hand, in order for the repair pixel PXerr to display the same gray level as that of the normal pixel PXnor, the repair pixel PXerr must emit light twice as much as the emission time of the normal pixel PXnor.

For example, when the repair pixel PXerr implements the third gray level, the repair pixel PXerr is reset to a light emission during the second subfield SF2 and the third subfield SF3, And does not emit light during the remaining first subfield SF1, fourth subfield SF4 through eighth subfield SF9, and dummy subfield DSF. As a result, the repair pixel PXerr can display the third gradation.

That is, in order for the repair pixel PXerr to realize the gradation below the maximum gradation, the dummy sub-field is set to the light-emitting sub-field or the non-light-emitting sub-field so as to emit light at twice the light- Thereby making it possible to normally emit light at the original luminance.

As described above, in the embodiment of the present invention, the gradation can be expressed by differently adjusting the light emission time of the normal pixel PXnor and the repair pixel PXerr, which display the same gradation during one frame period.

9 is a block diagram schematically showing a configuration of a signal processing unit according to an embodiment of the present invention.

9, the signal processing unit 130 may include an A / D conversion unit 131, a correction unit 133, and a memory 135. [

The A / D converter 131 samples the frame-based image data Din input from the outside on the basis of the clock signal supplied by the controller 120, extracts the gradation for each pixel PX, It is possible to convert the digital data into a predetermined number of bits, for example, 9 bits. The input image data Din may be a TV signal or a video signal, or may be an analog signal formed by D / A conversion of a data signal from a computer. The A / D conversion unit 131 may store the converted digital data in the memory 135 and / or output it to the correction unit 133. [

The correction unit 133 reads the coordinates of the repair pixel PXerr stored in the memory 135 and corrects the digital data set in the repair pixel PXerr. In order to implement the gradation to be displayed by the repair pixel PXerr, the correcting unit 133 corrects the bit in the subfield and the dummy subfield so as to emit light at twice the light emission time of the normal pixel PXnor that displays the same gradation, So that the digital data can be corrected.

The corrected digital data is stored in the memory 135 and outputted as the data signal D to the data driver 150. [

In the above-described embodiment, the example in which the pixel PX includes two sub-luminous elements having the same area has been described. However, even when the pixel PX includes two or more sub-luminous elements having different areas, The embodiment of the present invention can be applied by adjusting the period.

Meanwhile, in the above-described embodiment, 9-bit driving in which one frame is composed of 8 sub-fields and dummy sub-fields has been described as an example, but the number of sub-fields constituting one frame can be variously changed. In addition, although the subfields are arranged in the increasing order of the weights, the weights may be arranged in decreasing order in one frame, or the subfields may be arranged regardless of the weights.

Although the present invention has been described with reference to the limited embodiments, various embodiments are possible within the scope of the present invention. It will also be understood that, although not described, equivalent means are also incorporated into the present invention. Therefore, the true scope of protection of the present invention should be defined by the following claims.

Claims (18)

A display unit including a first pixel including a plurality of sub-luminous elements and a second pixel from which at least one of the plurality of sub-luminous elements is separated; And
And a driving method of driving a sub-light emitting device in which one frame is divided into a plurality of sub-fields and a dummy sub-field, a sum of light emission periods of each of the plurality of sub-fields is set as a light emission period of the dummy sub- And a signal processing unit for generating a data signal for expressing the gradation as the light emission time according to the light emission time. The signal processing apparatus according to claim 1,
An A / D conversion unit for extracting the gradations of the first pixel and the second pixel from the video data of each frame, and allocating bits to each of the plurality of subfields and the dummy subfields and converting the extracted gradation into digital data; ; And
And a correction unit that corrects the digital data of the second pixel so that the light emission time of the second pixel is twice the light emission time of the first pixel that expresses the same gradation. The method according to claim 1,
Wherein the dummy subfield of the first pixel is a non-emission sub-field that displays black. The method according to claim 1,
Wherein the dummy sub-field of the second pixel is a non-light-emitting sub-field that displays a light-emitting sub-field or a black according to a gray-scale level. The method according to claim 1,
Wherein the display unit is capable of implementing a number of gradations of 2 ^x (x = the number of subfields excluding dummy subfields). The method according to claim 1,
Wherein the dummy subfield is followed by the plurality of subfields, and the most significant bit of the data signal is allocated. The organic light emitting display according to claim 1, wherein each of the sub-
A first electrode connected to the pixel circuit;
A second electrode facing the first electrode; And
And a light emitting layer between the first electrode and the second electrode. 8. The pixel circuit according to claim 7,
A first transistor that is turned on by a scan signal applied to the scan line and transmits a data signal applied to the data line;
A second transistor whose turn-on is controlled according to a logic level of the data signal; And
And a capacitor for storing a voltage corresponding to the data signal. The method according to claim 1,
A scan driver for applying a scan signal to the plurality of subfields and the dummy subfields with a scan line; And
And a data driver for applying the data signal to the first pixel and the second pixel in response to the scan signal. A method of driving an organic light emitting display including a first pixel including a plurality of sub-luminous elements and a second pixel including at least one of the plurality of sub-luminous elements,
Dividing one frame into a plurality of subfields and a dummy subfield; And
A step of setting a sum of light emission periods of each of the plurality of subfields as a light emission period of the dummy subfield and generating a data signal for expressing a gray level as a light emission time corresponding to selective light emission of the sub- And driving the organic light emitting display device. 11. The method of claim 10,
Extracting grayscales of the first pixel and the second pixel from image data of a frame unit;
Assigning bits to each of the plurality of subfields and dummy subfields to convert the extracted gray levels into digital data; And
And correcting the digital data of the second pixel so that the light emission time of the second pixel is twice the light emission time of the first pixel representing the same gradation. 11. The method of claim 10,
Wherein the dummy subfield of the first pixel is a non-emission sub-field that displays black. 11. The method of claim 10,
Wherein the dummy sub-field of the second pixel is a non-light-emitting sub-field that displays a light-emitting sub-field or a black according to a gray-scale level. 11. The method of claim 10,
Wherein the organic light emitting display has a number of grayscale levels 2 ^x (x = the number of subfields except the dummy subfield). 11. The method of claim 10,
Wherein the dummy subfield is followed by the plurality of subfields, and the most significant bit of the data signal is allocated. 11. The light emitting device according to claim 10, wherein each of the sub-
A first electrode connected to the pixel circuit;
A second electrode facing the first electrode; And
And a light emitting layer between the first electrode and the second electrode. 17. The pixel circuit according to claim 16,
A first transistor that is turned on by a scan signal applied to a scan line and transfers the data signal to the data line;
A second transistor whose turn-on is controlled according to a logic level of the data signal; And
And a capacitor for storing a voltage corresponding to the data signal. 11. The method of claim 10,
Applying a scan signal to each of the plurality of subfields and the dummy subfield by a scan line; And
And applying the data signal to the first pixel and the second pixel in response to the scan signal.

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