KR101470644B1 - Organic Light Emitting Diode Display And Driving Method Thereof - Google Patents

Abstract

The present invention relates to an organic light emitting diode (OLED) display device and a driving method thereof, which can extend the lifetime and enhance display quality.

The organic light emitting diode display device includes a display panel having a first region in which a moving image is displayed and a second region in which a still image is displayed, the display panel displaying a gray scale according to a light emission amount of the organic light emitting diode; The input digital video data is divided into first digital video data to be displayed in the first area and second digital video data to be displayed in the second area through frame-to-frame data comparison, An image processing circuit which holds the input and lowers only the luminance of the second digital video data; And a data driving circuit for applying the first digital video data and the second digital video data whose luminance is reduced to the display panel.

Stress, pattern, still image, moving image, deterioration, luminance

Description

[0001] The present invention relates to an organic light emitting diode (OLED) display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode (OLED) display device, and more particularly, to an organic light emitting diode display device and a method of driving the same, which can extend the lifetime and display quality.

2. Description of the Related Art Recently, various flat panel display devices capable of reducing weight and volume, which are disadvantages of cathode ray tubes (CRTs), have been developed. Such a flat panel display device includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP) And a light emitting device (Electroluminescence Device).

PDP has attracted attention as a display device that is most advantageous for large screen size but small size because of its simple structure and manufacturing process, but it has disadvantage of low luminous efficiency, low luminance and high power consumption. Thin Film Transistor LCD (TFT LCD) is the most widely used flat panel display device, but has a narrow viewing angle and low response speed. The electroluminescent device is divided into an inorganic electroluminescent device and an organic light emitting diode display device depending on the material of the light emitting layer. The organic electroluminescent device is self-emitting as a self-luminous device and has a high response speed and a large luminous efficiency, brightness and viewing angle.

The organic light emitting diode device has organic compound layers (HIL, HTL, EML, ETL, EIL) formed between the anode electrode and the cathode electrode as shown in FIG.

The organic compound layer includes a hole injection layer, a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) .

When driving voltage is applied to the anode electrode and the cathode electrode, electrons passing through the hole transport layer (HTL) and the electron injection layer (EIL) and the electron transport layer (ETL) are transferred to the light emitting layer (EML) , And as a result, the light emitting layer (EML) emits visible light. The display image is implemented through visible light generated from the light-emitting layer (EML).

The organic light emitting diode display device is divided into a passive matrix type or an active matrix type using a TFT as a switching element. In the passive matrix method, the light emitting cells are selected according to the currents applied to the anode electrodes and the cathode electrodes orthogonal to each other. In the active matrix method, the light emitting cells are selected by selectively turning on the TFTs as the active elements, And maintains the light emission of the light emitting cell by the voltage held in the storage capacitor.

2 is a circuit diagram showing one pixel equivalently in an active matrix type organic light emitting diode display.

Referring to FIG. 2, a pixel of an active matrix organic light emitting diode display device includes an organic light emitting diode (OLED), a switch TFT SW, a driver TFT DR, and a storage capacitor Cst. The switch TFT (SW) and the drive TFT (DR) are implemented as N-type MOS-FETs.

The switch TFT SW is turned on in response to a scan pulse from the gate line GL, thereby making the current path between the source electrode and the drain electrode conductive. The data voltage from the data line DL during the ON time period of the switch TFT SW is applied to the gate electrode of the drive TFT DR and the storage capacitor Cst via the source electrode and the drain electrode of the switch TFT SW .

The driving TFT DR controls the current flowing in the organic light emitting diode OLED according to the difference voltage Vgs between the gate electrode and the source electrode of the driving TFT DR.

The storage capacitor Cst keeps the voltage supplied to the gate electrode of the driving TFT DR constant for one frame period by storing the data voltage applied to one electrode of the storage capacitor Cst.

The organic light emitting diode (OLED) has a structure as shown in FIG. The organic light emitting diode OLED is connected between the source electrode of the driving TFT DR and the low potential driving voltage source VSS.

However, in the above-described organic light emitting diode display device, when a specific pattern for a long time, that is, a fixed image without moving, is displayed, the fixed image acts as a stress pattern and easily deteriorates the organic light emitting diode OLED or TFT. The deterioration of the organic light emitting diode (OLED) element or the TFT causes a stain such as the afterglow of the DC image, thereby deteriorating the display quality and the life of the display device. In recent years, a driving method has been proposed in which the display luminance is gradually lowered to a predetermined constant value over time in order to prevent the deterioration of the life span and image quality.

In this conventional driving method, only the luminance of the entire image is controlled with time without considering the degree of stress due to the image data. Accordingly, the luminance is reduced in the relatively low stress region as in the motion-presence region in the display image, and the contrast ratio as a whole is deteriorated.

Accordingly, it is an object of the present invention to provide an organic light emitting diode display device and a method of driving the same, which can improve afterglow according to a stress pattern and improve lifetime while minimizing visual difference.

In order to achieve the above object, an organic light emitting diode display device according to an embodiment of the present invention includes a first region in which a moving image is displayed and a second region in which a still image is displayed, Display panel; The input digital video data is divided into first digital video data to be displayed in the first area and second digital video data to be displayed in the second area through frame-to-frame data comparison, An image processing circuit which holds the input and lowers only the luminance of the second digital video data; And a data driving circuit for applying the first digital video data and the second digital video data whose luminance is reduced to the display panel.

The image processing circuit may further include: a luminance / color separator for separating the input digital video data into a luminance component and a chrominance component; Comparing the luminance component of the current frame separated by the luminance / color separator with the luminance component of the previous frame, comparing the logical level of the motion detection signal with the luminance component of the previous frame, A motion detector; Data for correcting the luminance value of the second luminance component corresponding to the second area to a value lower than the input value while keeping the luminance value of the first luminance component corresponding to the first area intact in response to the motion detection signal A processor; A luminance / color mixing unit for calculating the first digital video data using the first luminance component and the chrominance component, and calculating the second digital video data using the second luminance component and the chrominance component; And a delay unit for delaying the chrominance components until the operation of the data processing unit is completed and synchronizing the first and second luminance components and the chrominance components input to the luminance / color mixing unit.

Wherein the motion detector comprises: a frame memory for storing a luminance component of the previous frame; And a comparator for comparing the brightness component of the current frame and the brightness component of the previous frame on a pixel-by-pixel or an area of a predetermined fixed size.

When the absolute value of the difference between the brightness component of the current frame and the brightness component of the previous frame corresponding to the first pixel exceeds a predetermined reference value, the comparator regards the first pixel as the first area Generating a motion detection signal of a first logic level; If the absolute value of the difference between the luminance component of the current frame corresponding to the second pixel and the luminance component of the previous frame does not exceed the predetermined reference value, the second pixel is regarded as the second region, Level motion detection signal.

Wherein the data processor outputs a first luminance reduction constant having a value of '0' in response to the motion detection signal of the first logic level, and outputs a first luminance reduction constant having a value of ' A MUX for outputting a second luminance reduction constant; And an operation unit for lowering the luminance value of the luminance component of the current frame on the basis of the first luminance reduction constant or the second luminance reduction constant, and '?' Has a value larger than '0'.

Wherein the data processing unit includes a correction luminance component preset to have a luminance value lower than the luminance component of the current frame for each pixel and outputs the correction luminance component for each pixel using the luminance component of the current frame as a read address LUT; And a MUX for outputting the brightness component of the current frame in response to the motion detection signal of the first logic level and outputting the corrected brightness component in response to the motion detection signal of the second logic level.

A driving method of an organic light emitting diode display device including a display panel having a first region in which a moving image is displayed and a second region in which a still image is displayed according to an embodiment of the present invention, The input digital video data is divided into first digital video data to be displayed in the first area and second digital video data to be displayed in the second area through comparison of data between frames, A first step of maintaining the input luminance as it is and lowering only the luminance of the second digital video data; And a second step of applying the first digital video data and the second reduced luminance digital video data to the display panel.

The organic light emitting diode display device and the driving method thereof according to the present invention reduce the luminance of data to be displayed in a motionless region (high stress region) such as a background in a display image, The deterioration degree of the TFT is reduced to improve the display quality and the life of the display device can be prolonged.

Further, the organic light emitting diode display device and the driving method thereof according to the present invention minimize the visual difference by maintaining the luminance of data to be displayed in a motion area (low stress area) such as an object in the display image as they are, It is possible to significantly reduce the phenomenon of the contrast ratio drop caused by the luminance drop in the fixed image.

Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 3 to 6. FIG.

3 shows an organic light emitting diode display device according to an embodiment of the present invention.

3, an organic light emitting diode display device according to an embodiment of the present invention includes a display panel 31, a data driving circuit 32, a gate driving circuit 33, a timing controller 34, and an image processing circuit 35 .

The display panel 31 includes a plurality of pixels formed in a crossing region of a plurality of gate lines GL and a plurality of data lines DL. Each of the pixels includes a switch TFT, a driver TFT, a storage capacitor, and the like, and displays the gradation by adjusting the amount of current applied to the organic light emitting diode. Each of the pixels may be driven by either a voltage driving method or a current driving method. In the voltage driving method, a voltage driving type data driving circuit is directly applied to control the gate voltage of the driving TFT to control the current flowing in the organic light emitting diode. On the other hand, in the current driving method, a current driving type data driving circuit is used to set a gate voltage of a driving TFT through a current determination process for a display gradation, and then an up / down scaling process is performed to adjust a current flowing to the organic light emitting diode do. For this driving, the display panel 31 is formed with signal wirings for supplying a high-potential driving voltage to each pixel, and signal wirings for supplying a low-potential driving voltage.

The data driving circuit 32 responds to the data control signal DDC from the timing controller 34 to convert the digital video data RGB / R'G'B 'input from the image processing circuit 35 to a gamma reference voltage Into analog data voltages, and supplies the analog data voltages to the data lines DL. The analog data voltage is supplied to the pixels via the data lines DL. It is a matter of course that the data driving circuit 32 is a voltage driving type and can be replaced with a current driving type according to a driving method of a pixel. The current driving type data driving circuit has a source type (Souce-type) for applying a current to a display panel and a sink type (sink-type) to which a current is applied from a display panel.

The gate drive circuit 33 sequentially supplies the scan pulses to the gate lines GL in response to the gate control signal GDC from the timing controller 34 to select a horizontal line to which the data signal is applied.

The timing controller 34 receives timing signals such as horizontal and vertical synchronization signals Hsync and Vsync, a data enable signal DE and a dot clock DCLK from a system board (not shown) And generates control signals GDC and DDC for controlling the operation timing of the gate driving circuit 33 and the gate driving circuit 33. [ The data control signal DDC for controlling the operation timing of the data driving circuit 32 is supplied to a data driving circuit 32 based on a rising or falling edge, A sampling clock (Source Sampling Clock), a source output enable signal (Source Output Enable) for indicating the output of the data driving circuit 32, and the like. The gate control signal GDC for controlling the operation timing of the gate drive circuit 33 includes a gate start pulse indicating a start horizontal line from which a scan starts in one vertical period in which one screen is displayed, A gate shift clock signal (Gate Shift Clock) generated by a pulse width corresponding to the ON period of the TFT as a timing control signal for sequentially shifting the gate start pulse inputted to the shift register in the gate 33, And a gate output enable signal (Gate Output Enable) for instructing the output of the driving circuit 33.

Further, the timing controller 34 supplies the digital video data (RGB) input from the system board to the image processing circuit 35. Then, the video-processed digital video data (RGB / R'G'B ') from the image processing circuit 35 is rearranged according to the resolution of the display panel 31 and supplied to the data driving circuit 32.

The image processing circuit 35 compares the digital video data RGB inputted from the timing controller 34 with each other to detect motion and fixed areas in the current frame image. Then, the luminance of the data (moving image data) to be displayed in the motion-presence area is maintained as it is, and the luminance of the data (still image data) to be displayed in the fixed area is reduced. The reason why only the luminance of the still image data is reduced in this manner is that the degree of stress received by the organic light emitting diode and the TFT by the still image data is much larger than the moving image data. The stress to which the organic light emitting diode and the TFT are subjected is greatly reduced by the reduction of the luminance of the still image data. The visual difference of the entire image before and after the adjustment of the still image data is minimized by maintaining the luminance of the moving image data. The image processing circuit 35 can be integrated in the timing controller 34 and integrated.

4 shows a detailed configuration of the image processing circuit 35 according to the first embodiment.

4, the image processing circuit 35 according to the first embodiment includes a luminance / color separation section 41, a motion detection section 42, a data processing section 43, a delay section 44, and a luminance / And a mixing unit 45.

The luminance / color separation unit 41 separates the digital video data RGB input from the timing controller 34 into a luminance component Y and chrominance components U and V.

The motion detection unit 42 compares the luminance component Y of the current frame component Fn separated by the luminance / color separation unit 41 with the luminance component Y of the previous frame component Fn-1 , And generates a logic level of the motion detection signal SEL differently according to the comparison result. To this end, the motion detection section 42 includes a frame memory 42a and a comparison section 42b.

The frame memory 42a stores the luminance component Y of the previous frame fraction Fn-1 separated by the luminance / color separation unit 41. [ The comparator 42b compares the luminance component Y of the current frame component Fn with the luminance component Y of the previous frame component Fn-1 on a pixel by pixel basis. If the absolute value of the difference between the luminance component Y of the current frame component Fn and the luminance component Y of the previous frame component Fn-1 corresponding to the specific pixel exceeds a predetermined reference value, The pixel is regarded as a region in which moving image data is displayed and a motion detection signal SEL of a first logic level is generated. On the other hand, if the absolute value of the difference between the luminance component Y of the current frame component Fn and the luminance component Y of the previous frame component Fn-1 corresponding to the specific pixel does not exceed the predetermined reference value, And the pixel 42b regards the pixel as an area in which the still image data is displayed and generates the motion detection signal SEL at the second logic level.

Meanwhile, the motion detecting unit 42 may be replaced with other known image detecting means such as a motion vector.

The data processor 43 selectively lowers the value of the luminance component Y of the current frame component Fn in response to the motion detection signal SEL from the motion detector 42. [ To this end, the data processing unit 43 includes a multiplexer (MUX) 43a and an operation unit 43b.

The MUX 43a outputs one of the luminance reduction constants having a value of '0' or '?' According to the logic level of the motion detection signal SEL. The MUX 43a outputs a luminance reduction constant having a value of '0' in response to the motion detection signal SEL of the first logic level and outputs a luminance reduction constant having a value of 'alpha' in response to the motion detection signal SEL of the second logic level Lt; / RTI > Here, '?' May have a value greater than '0', for example, 1 to 5. The operation unit 43b lowers the value of the luminance component Y of the current frame component Fn based on the luminance reduction constant inputted from the MUX 43a. Thus, the luminance value of the luminance component corresponding to the moving image data among the luminance components Y of the current frame component Fn is maintained at the same luminance level as the input level, while the luminance component corresponding to the still image data is greater than the input level Is corrected to a low luminance value. Here, the luminance component corresponding to the still image data is defined as the corrected luminance component (Y ').

The delay unit 44 delays the chrominance components U and V until the luminance component is corrected in the data processing unit 43 and outputs the luminance component Y / Y ', which is input to the luminance / color mixing unit 45, And the chrominance components (U, V).

The luminance / color mixing unit 45 calculates the first digital video data RGB to be displayed in the moving image area using the luminance component Y and the color difference components U and V. [ The first digital video data (RGB) has the same luminance value as the input digital video data (RGB). Also, the luminance / color mixing unit 45 calculates the second digital video data R'G'B 'to be displayed in the still image region using the corrected luminance component Y' and the chrominance components U and V do. The second digital video data R'G'B 'has a lower luminance value than the input digital video data RGB.

5 shows a detailed configuration of the image processing circuit 35 according to the second embodiment.

5, the image processing circuit 35 according to the second embodiment includes a luminance / color separation section 51, a motion detection section 52, a data processing section 53, a delay section 54, and a luminance / And a mixing unit 55.

The luminance / color separation section 51 separates the digital video data RGB input from the timing controller 34 into a luminance component Y and color difference components U and V. [

The motion detection unit 52 compares the luminance component Y of the current frame component Fn separated by the luminance / color separation unit 51 with the luminance component Y of the previous frame component Fn-1 , And generates a logic level of the motion detection signal SEL differently according to the comparison result. To this end, the motion detection unit 52 includes a frame memory 52a and a comparison unit 52b.

The frame memory 52a stores the luminance component Y of the previous frame component Fn-1 separated by the luminance / color separation section 51. [ The comparator 52b compares the luminance component Y of the current frame component Fn with the luminance component Y of the previous frame component Fn-1 on a pixel by pixel basis. When the absolute value of the difference between the luminance component Y of the current frame component Fn and the luminance component Y of the previous frame component Fn-1 corresponding to the specific pixel exceeds a predetermined reference value, The pixel is regarded as a region in which moving image data is displayed and a motion detection signal SEL of a first logic level is generated. On the other hand, if the absolute value of the difference between the luminance component Y of the current frame component Fn and the luminance component Y of the previous frame component Fn-1 corresponding to the specific pixel does not exceed the predetermined reference value, The first pixel 52b regards the pixel as an area where the still image data is displayed and generates the motion detection signal SEL at the second logic level.

Meanwhile, the motion detecting unit 52 may be replaced with other known image detecting means such as a motion vector.

The data processing section 53 selectively lowers the value of the luminance component Y of the current frame component Fn in response to the motion detection signal SEL from the motion detection section 52. [ To this end, the data processing section 53 includes a look-up table (LUT) 53a and a multiplexer (MUX) 53b.

The LUT 53a is stored in the memory including the preset correction luminance component Y '. The corrected luminance component Y 'is set to have a luminance value lower than the luminance component Y of the current frame component Fn for each pixel. The LUT 53a uses the luminance component Y of the current frame component Fn for each pixel as a read address and outputs the corrected luminance component Y '.

The MUX 53b selectively outputs the luminance component Y and the corrected luminance component Y 'in accordance with the logic level of the motion detection signal SEL. The MUX 53b outputs the luminance component Y in response to the motion detection signal SEL at the first logic level and outputs the corrected luminance component Y 'in response to the motion detection signal SEL at the second logic level Output. Thus, the luminance value of the luminance component corresponding to the moving image data among the luminance components Y of the current frame component Fn is maintained at the same luminance level as the input level, while the luminance component corresponding to the still image data is greater than the input level Is corrected to a low luminance value.

The delay unit 54 delays the chrominance components U and V until the luminance component is corrected in the data processing unit 53 and outputs the luminance component Y / Y ', which is input to the luminance / color mixing unit 55, And the chrominance components (U, V).

The luminance / color mixing unit 55 calculates the first digital video data RGB to be displayed in the moving image area using the luminance component Y and the chrominance components U and V. [ The first digital video data (RGB) has the same luminance value as the input digital video data (RGB). The luminance / color mixing unit 55 calculates the second digital video data R'G'B 'to be displayed in the still image area using the corrected luminance component Y' and the chrominance components U and V do. The second digital video data (R'G'B ') has a lower luminance value than the input digital video data (RGB).

6 illustrates a method of driving an organic light emitting diode display according to an embodiment of the present invention.

6, the driving method divides digital video data (RGB) of an input current frame into a luminance component (Y) and chrominance components (U, V) (S61, S62)

Subsequently, the driving method compares the luminance component Yc of the current frame with the luminance component Yp of the previous frame for each pixel to determine whether the pixel corresponds to the moving image area or the still image area (S63, S64)

As a result of the determination, if the pixel corresponds to the still image area, the luminance value of the input luminance component Yc corresponding to the pixel is lowered to output the corrected luminance component Yc '. (S65) (R'G'B ') whose luminance is decreased using the chrominance components (U, V) and chrominance components (U, V), and displays the second digital video data R'G'B' on the display panel.

If the pixel belongs to the moving image area, the luminance value of the input luminance component Yc corresponding to the pixel is output as it is as the input. (S67) Then, the input luminance component Yc and the chrominance component U, and V), and then displays the first digital video data RGB on the display panel to maintain the luminance of the moving image area unchanged (S66)

INDUSTRIAL APPLICABILITY As described above, the organic light emitting diode display device and the driving method thereof according to the present invention reduce the brightness of data to be displayed in a motionless region (high stress region) such as a background in a display image, The degree of deterioration of the organic light emitting diode device or the TFT can be reduced to improve the display quality and prolong the life of the display device.

Further, the organic light emitting diode display device and the driving method thereof according to the present invention minimize the visual difference by maintaining the luminance of data to be displayed in a motion area (low stress area) such as an object in the display image as they are, It is possible to significantly reduce the phenomenon of the contrast ratio drop caused by the luminance drop in the fixed image.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical 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.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a diagram for explaining the principle of light emission of a general organic light emitting diode display device. Fig.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED) display device.

3 is a block diagram showing an organic light emitting diode display device according to an embodiment of the present invention.

4 is a block diagram showing a detailed configuration of an image processing circuit according to the first embodiment;

5 is a block diagram showing a detailed configuration of an image processing circuit according to the second embodiment;

FIG. 6 is a flowchart illustrating a method of driving an organic light emitting diode display according to an exemplary embodiment of the present invention. Referring to FIG.

Description of the Related Art

31: display panel 32: data driving circuit

33: Gate driving circuit 34: Timing controller

35: image processing circuit 41, 51: luminance /

42 and 52: motion detection units 43 and 53:

44,54: delay unit 45,55: luminance / color mixing unit

Claims (8)

A display panel having a first region in which a moving image is displayed and a second region in which a still image is displayed, the display panel displaying grayscale according to an amount of light emitted from the organic light emitting diode; The input digital video data is divided into first digital video data to be displayed in the first area and second digital video data to be displayed in the second area through frame-to-frame data comparison, An image processing circuit which holds the input and lowers only the luminance of the second digital video data; And And a data driving circuit for applying the first digital video data and the second digital video data whose luminance is reduced to the display panel. The method according to claim 1, The image processing circuit comprising: A luminance / color separator for separating the input digital video data into a luminance component and a chrominance component; Comparing the luminance component of the current frame separated by the luminance / color separator with the luminance component of the previous frame, comparing the logical level of the motion detection signal with the luminance component of the previous frame, A motion detector; Data for correcting the luminance value of the second luminance component corresponding to the second area to a value lower than the input value while keeping the luminance value of the first luminance component corresponding to the first area intact in response to the motion detection signal A processor; A luminance / color mixing unit for calculating the first digital video data using the first luminance component and the chrominance component, and calculating the second digital video data using the second luminance component and the chrominance component; And And a delay unit for delaying the chrominance components until the operation of the data processing unit is completed and synchronizing the first and second luminance components and the chrominance components input to the luminance / color mixing unit. Light emitting diode display. 3. The method of claim 2, Wherein the motion detection unit comprises: A frame memory for storing luminance components of the previous frame; And And a comparator for comparing the luminance component of the current frame with the luminance component of the previous frame for each pixel or an area of a predetermined fixed size. The method of claim 3, Wherein, When the absolute value of the difference between the luminance component of the current frame and the luminance component of the previous frame corresponding to the first pixel exceeds a predetermined reference value, the first pixel is regarded as the first region, Generating a motion detection signal of the motion vector; If the absolute value of the difference between the luminance component of the current frame corresponding to the second pixel and the luminance component of the previous frame does not exceed the predetermined reference value, the second pixel is regarded as the second region, Level motion detection signal is generated. 5. The method of claim 4, Wherein the data processing unit comprises: In response to the motion detection signal of the first logic level, a first luminance reduction constant having a value of '0' in response to the motion detection signal of the first logic level, and a second luminance reduction constant A MUX for outputting the MUX; And And an operation unit for lowering the luminance value of the luminance component of the current frame based on the first luminance reduction constant or the second luminance reduction constant, Wherein the value '?' Has a value greater than '0'. 5. The method of claim 4, Wherein the data processing unit comprises: A LUT including a correction luminance component preset to have a luminance value lower than the luminance component of the current frame for each pixel and outputting the luminance luminance component for each pixel with the luminance component of the current frame as a read address; And And a MUX for outputting the luminance component of the current frame in response to the motion detection signal of the first logic level and outputting the corrected luminance component in response to the motion detection signal of the second logic level Organic light emitting diode display. A driving method of an organic light emitting diode display device including a display panel having a first region in which a moving image is displayed and a second region in which a still image is displayed and displaying a gradation according to an amount of light emitted from the organic light emitting diode, The input digital video data is divided into first digital video data to be displayed in the first area and second digital video data to be displayed in the second area through frame-to-frame data comparison, A first step of maintaining the input and lowering only the luminance of the second digital video data; And And a second step of applying the first digital video data and the second digital video data with reduced brightness to the display panel. 8. The method of claim 7, In the first step, Separating the input digital video data into a luminance component and a chrominance component; Comparing a brightness component of the separated current frame with a brightness component of a previous frame and generating a logic level of the motion detection signal differently for the first and second regions according to the comparison result; Maintaining the luminance value of the first luminance component corresponding to the first area as it is and correcting the luminance value of the second luminance component corresponding to the second area to a value lower than the input in response to the motion detection signal ; Delaying the chrominance components until the correction operation is completed to synchronize the first and second luminance components with the chrominance components; And And calculating the first digital video data using the first luminance component and the chrominance component and calculating the second digital video data using the second luminance component and the chrominance component. And a driving method of the organic light emitting diode display device.

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