KR20170124148A - Organic light emitting display panel, organic light emitting display device, and method for driving the organic light emitting display device - Google Patents

Abstract

Embodiments of the present invention relate to an organic light emitting display panel capable of providing an effect of displaying an image with a higher frame frequency than an actual frame frequency, an organic light emitting display device, and a driving method thereof. The embodiments of the present invention provide an effect of displaying two images by displaying an actual image and a fake image in one image frame section by repeating a section in which each sub pixel emits light and a section in which each sub pixel does not emit light by controlling power for the one image frame section. Therefore, according to the embodiments of the present invention, the organic light emitting display panel capable of providing image quality and moving picture response speed close to high-speed driving without increasing a frame frequency, the organic light emitting display device, and the driving method thereof can be provided.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting display panel, an organic light emitting display, and a method of driving the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED)

The present embodiments relate to an organic light emitting display panel, an organic light emitting display, and a method of driving the organic light emitting display.

BACKGROUND ART [0002] Organic light emitting displays (OLEDs), which have been popular as display devices in recent years, use an organic light emitting diode (OLED) to emit light by itself, and thus have a high response speed and advantages such as luminous efficiency, luminance and viewing angle.

The organic light emitting display includes an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines are arranged and a plurality of subpixels defined by gate lines and data lines are arranged, A gate driver, a data driver for driving a plurality of data lines, and a controller for controlling driving of the gate driver and the data driver.

An organic light emitting diode is disposed in a plurality of subpixels, and an image is displayed by controlling the brightness of the subpixels selected by the scan signal according to the gray level of the data.

Although such an organic light emitting display device has the advantage of a high response speed, there is an increasing demand for a higher response speed, and thus there is an increasing need for high-speed driving for improving the response speed.

However, in order to perform high-speed driving, data input must be performed at a high speed, which requires a high performance of the data driver, which is difficult. In particular, since the load on the data line is large at a large area and at a high resolution, there is a limit to apply high-speed driving in current OLED displays.

It is an object of the present embodiments to provide an organic light emitting display device and a driving method thereof that can improve a moving image response time and an image quality while using the same frame frequency of the organic light emitting display device.

It is an object of the present embodiments to provide a structure of an organic light emitting display panel capable of improving moving picture response time and picture quality at the same frame frequency.

It is an object of the present embodiments to provide an organic light emitting display device and a method of driving the same that can eliminate uneven brightness on the screen that may occur in providing the effect of high-speed driving by using the same frame frequency.

The present embodiments provide an organic light emitting display panel, an organic light emitting display, and a driving method thereof that provide the effect of high-speed driving while using the same frame frequency.

One embodiment provides an organic light emitting display including an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines are disposed and a plurality of subpixels defined by gate lines and data lines are disposed.

Each of the plurality of subpixels includes an organic light emitting diode and a driving transistor for driving the organic light emitting diode. The driving transistor may be connected to the driving power source, and the organic light emitting diode may be connected to the base power source.

In the present embodiments, the driving power is controlled or the base power is controlled in a certain section of the image frame interval defined by the frame frequency, so that a non-emission period of the image frame section exists for each sub-pixel.

The subpixel structure for controlling the non-emission period of such a subpixel is, for example, a structure in which a driving voltage line is electrically connected to a driving transistor included in a subpixel arranged in the same direction as the gate line and driven by the same gate line Can

In this structure, when the subpixel is driven by the gate line and then a predetermined period of time shorter than the video frame period has elapsed, the driving voltage line may be switched to cause the corresponding subpixel to be in the non-emission state.

When the predetermined time elapses after the subpixel becomes non-emitting state and shorter than the video frame period, the driving voltage line is switched to drive the subpixel to emit light.

As a structure of another subpixel, N subpixel blocks are arranged in units of subpixels arranged in adjacent rows, and N driving voltage lines are arranged between subpixels arranged in the (2i-1) th column and the And can be arranged in a direction crossing the gate line.

The driving transistors included in the sub-pixels arranged in the (2i-1) -th column and the driving transistors included in the sub-pixels arranged in the 2i-th column are electrically connected to any one of the N driving voltage lines.

For example, the driving transistor of the subpixel included in the kth subpixel block may be connected to the kth driving voltage line.

When a predetermined time elapses after a subpixel included in each subpixel block is driven, a driving voltage line connected to the driving transistor of the subpixel included in the subpixel block is driven to switch the subpixels to a non- The light emitting state can be obtained.

When the subpixel included in the subpixel block becomes a non-emission state and then a certain period of time shorter than the video frame period has elapsed, the driving voltage line is switched to drive the subpixels to emit light.

At this time, in driving the driving voltage line, the data voltage applied to the data line in the driving voltage line OFF state, that is, in the sub-pixel non-light emitting state, has a gain according to the gray level indicated by the corresponding data voltage May be the applied data voltage.

According to the embodiments, the video response time and image quality close to the high-speed driving can be provided by controlling the driving power source or the base power source while using the same frame frequency of the organic light emitting display device.

According to these embodiments, it is possible to provide a structure of a subpixel capable of providing effects close to high-speed driving under the same frame frequency.

According to the embodiments, it is possible to provide an organic light emitting display device and a driving method thereof that can prevent a luminance unevenness that may occur in a structure and a driving method that provide an effect of high-speed driving.

FIG. 1 is a diagram showing a schematic configuration of an organic light emitting display according to the present embodiments.
2 is a diagram illustrating an example of a structure of a subpixel of an organic light emitting diode display according to an embodiment of the present invention.
3 is a view showing another example of the structure of subpixels of the organic light emitting display according to the present embodiments.
FIGS. 4 and 5 are views showing two examples of the subpixel structure of FIG. 3. FIG.
6 is a diagram illustrating low-speed driving and high-speed driving of the organic light emitting diode display according to the present embodiments.
7 is a diagram illustrating signal waveforms of a data voltage or a scan signal according to low-speed driving and high-speed driving of the organic light emitting diode display according to the present embodiments.
8 is a diagram illustrating a high-speed driving of a pake of the organic light emitting diode display according to the present embodiments.
FIGS. 9 and 10 are diagrams illustrating characteristics of a fast fake driving of the organic light emitting diode display according to the present embodiments and screen changes.
FIGS. 11 and 12 are views showing examples of the driving time lengths of the real driving and the fake driving in the high-speed driving of the fakes of the organic light emitting display according to the present embodiments.
FIG. 13 is a view illustrating a first embodiment of a sub-pixel structure for high-speed fake driving of an organic light emitting display according to the present embodiments.
FIGS. 14 and 15 are views showing examples of a scan signal and a driving voltage in the sub-pixel structure according to the first embodiment.
16 is a view illustrating a second embodiment of a sub-pixel structure for high-speed fake driving of an organic light emitting display according to the present embodiments.
FIG. 17 is a diagram illustrating an example of a screen change at a high-speed fake driving in a sub-pixel structure according to the second embodiment.
FIGS. 18 and 19 are views showing examples of a scan signal and a driving voltage in the sub-pixel structure according to the second embodiment.
FIG. 20 is a diagram illustrating an example in which the data gain process is applied during high-speed fake driving of the organic light emitting display according to the present embodiments.
FIG. 21 is a flowchart illustrating a method of driving an organic light emitting display according to an exemplary embodiment of the present invention. Referring to FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

FIG. 1 is a diagram showing a schematic configuration of an organic light emitting diode display 100 according to the present embodiments.

1, the OLED display 100 includes a plurality of data lines DL and a plurality of gate lines GL, a data line DL and a gate line GL, A data driver 120 for driving a plurality of data lines DL and a gate driver for driving a plurality of gate lines GL 130, and a controller 140 for controlling the data driver 120 and the gate driver 130.

The data driver 120 drives the plurality of data lines DL by supplying a data voltage to the plurality of data lines DL. Here, the data driver 120 is also referred to as a "source driver ".

The data driver 120 may include at least one source driver integrated circuit (SDIC) to drive a plurality of data lines DL.

Each source driver integrated circuit (SDIC) may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, Digital converter (ADC: Analog to Digital Converter).

When a specific gate line is opened by the gate driver 130, the data driver 120 converts the image data received from the controller 140 into an analog data voltage and supplies the data voltage to a plurality of data lines DL.

The gate driver 130 sequentially supplies the scan signals to the plurality of gate lines GL to sequentially drive the plurality of gate lines GL. Here, the gate driver 130 is also referred to as a "scan driver ".

The gate driver 130 may include at least one gate driver integrated circuit (GDIC).

Each gate driver IC (GDIC) may include a shift register, a level shifter, and the like.

The gate driver 130 sequentially supplies a scan signal of an ON voltage or an OFF voltage to the plurality of gate lines GL under the control of the controller 140.

The controller 140 supplies various control signals to the data driver 120 and the gate driver 130 to control the data driver 120 and the gate driver 130.

The controller 140 starts scanning according to the timing implemented in each frame, switches the input image data input from the outside according to the data signal format used by the data driver 120, and outputs the converted image data , And controls the data driving at a proper time according to the scan.

The controller 140 may be a timing controller used in a conventional display technology, or a controller that performs a further control function including a timing controller.

The controller 140 outputs various timing signals including a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input data enable (DE) signal, a clock signal CLK, (E.g., a host system).

The controller 140 receives a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input DE signal, and a clock signal to control the data driver 120 and the gate driver 130, And generates various control signals and outputs them to the data driver 120 and the gate driver 130.

For example, in order to control the gate driver 130, the controller 140 generates a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal GOE Gate Output Enable), and the like.

Here, the gate start pulse GSP controls the operation start timing of one or more gate driver integrated circuits constituting the gate driver 130. The gate shift clock GSC is a clock signal commonly input to one or more gate driver integrated circuits, and controls the shift timing of the scan signal (gate pulse). The gate output enable signal GOE specifies the timing information of one or more gate driver ICs.

In order to control the data driver 120, the controller 140 may further include a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE) And outputs various data control signals (DCS: Data Control Signals).

Here, the source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits constituting the data driver 120. The source sampling clock SSC is a clock signal for controlling sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the data driver 120.

Each subpixel arranged in the organic light emitting display panel 110 includes an organic light emitting diode (OLED) as a self-luminous element and a driving transistor such as a driving transistor for driving the organic light emitting diode (OLED) Device.

The types and the number of the circuit elements constituting each subpixel can be variously determined depending on a providing function, a design method, and the like.

2 shows an example of the sub-pixel structure of the OLED display 100 according to the present embodiments.

2, each sub-pixel includes an organic light emitting diode (OLED) and a driving transistor DRT (Driving Transistor) for driving the organic light emitting diode (OLED) A first transistor T1 electrically connected to a first node N1 corresponding to a gate node of the driving transistor DRT; : 1 frame time or 1/2 frame time, etc.). The storage capacitor (Cst: Storage Capacitor)

The organic light emitting diode OLED may include a first electrode (e.g., an anode electrode or a cathode electrode), an organic layer and a second electrode (e.g., a cathode electrode or an anode electrode) A base voltage (EVSS) may be applied to the electrodes.

The driving transistor DRT drives the organic light emitting diode OLED by supplying a driving current to the organic light emitting diode OLED.

The driving transistor DRT has a first node N1, a second node N2, and a third node N3.

The first node N1 of the driving transistor DRT is a node corresponding to a gate node and may be electrically connected to a source node or a drain node of the first transistor T1.

The second node N2 of the driving transistor DRT may be electrically connected to the first electrode of the organic light emitting diode OLED and may be a source node or a drain node.

The third node N3 of the driving transistor DRT may be electrically connected to a driving voltage line DVL that supplies a driving voltage EVDD as a node to which the driving voltage EVDD is applied, Node or source node.

The first transistor T1 is electrically connected between the data line DL and the first node N1 of the driving transistor DRT and receives the scan signal SCAN through the gate line to be controlled .

The first transistor T1 is turned on by the scan signal SCAN to transfer the data voltage Vdata supplied from the data line DL to the first node N1 of the driving transistor DRT have.

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

3 shows another example of the sub-pixel structure of the OLED display 100 according to the present embodiments.

Referring to FIG. 3, each sub-pixel disposed in the organic light emitting display panel 110 according to the present exemplary embodiment includes an organic light emitting diode OLED, a driving transistor DRT, a first transistor T1, In addition to the storage capacitor Cst, it may further include a second transistor T2.

3, the second transistor T2 is electrically connected between the second node N2 of the driving transistor DRT and a reference voltage line RVL for supplying a reference voltage Vref And may be controlled by receiving a sensing signal SENSE, which is a kind of a scan signal, to the gate node.

The second transistor T2 is turned on by the sensing signal SENSE and applies a reference voltage Vref supplied through the reference voltage line RVL to the second node N2 of the driving transistor DRT .

Referring to FIG. 3, the OLED display 100 according to the present embodiment includes an analog to digital converter (ADC) for measuring the voltage of the reference voltage line RVL and converting the voltage to a digital value, An initialization switch SPRE for controlling whether or not the reference voltage Vref is applied to the second node N2 of the driving transistor DRT and the connection between the reference voltage line RVL and the analogue digital converter ADC And a sampling switch (SAM) for controlling the sampling switch (SAM).

The initialization switch SPRE is set to a voltage level of the second node N2 of the driving transistor DRT such that the second node N2 of the driving transistor DRT in the sub- And is a switch for controlling the application state.

When the initialization switch SPRE is turned on, the reference voltage Vref is supplied to the reference voltage line RVL and is supplied to the second node N2 of the driving transistor DRT through the second transistor T2, ). ≪ / RTI >

The sampling switch (SAM) is turned on to electrically connect the reference voltage line (RVL) and the analog-to-digital converter (ADC).

The on-off timing is controlled so that the sampling switch SAM is turned on when the second node N2 of the driving transistor DRT in the sub-pixel becomes the voltage state reflecting the characteristic value of the desired circuit element.

When the sampling switch (SAM) is turned on, the analog-to-digital converter (ADC) can sense the voltage of the connected reference voltage line (RVL).

If the resistance component of the driving transistor DRT can be ignored when the second transistor T2 is turned on when the analog digital converter ADC senses the voltage of the reference voltage line RVL, The voltage measured by the second transistor ADC may correspond to the voltage of the second node N2 of the driving transistor DRT.

The voltage measured by the analog-to-digital converter (ADC) may be the voltage of the reference voltage line RVL, that is, the voltage of the second node N2 of the driving transistor DRT.

If a line capacitor is present on the reference voltage line RVL, the voltage sensed by the analog to digital converter ADC may be the voltage charged in the line capacitor on the reference voltage line RVL.

FIGS. 4 and 5 show two examples of the sub-pixel structure of FIG. 3 of the OLED display 100 according to the present embodiments.

As shown in FIG. 4, the switching operation of the first transistor T1 and the second transistor T2 can be independently controlled.

In this case, the scan signal SCAN applied to the gate node of the first transistor T1 and the sense signal SENSE applied to the gate node of the second transistor T2 may be different gate signals.

That is, the first transistor T1 receives the scan signal SCAN through the first gate line GL1 and the second transistor T2 receives the sense signal SENSE through the second gate line GL2. ) To the gate node.

In this case, two gate lines GL1 and GL2 for gate driving must be disposed in the OLED display panel 110. [

As shown in FIG. 5, the switching operation of the first transistor T1 and the second transistor T2 can be simultaneously controlled.

In this case, the scan signal SCAN applied to the gate node of the first transistor T1 and the sense signal SENSE applied to the gate node of the second transistor T2 are the same gate signal.

That is, the gate node of the first transistor T1 and the gate node of the second transistor T2 are simultaneously connected to one gate line GL to receive the scan signal SCAN at the same time.

In this case, one gate line GL for gate driving may be disposed on the organic light emitting diode display panel 110.

Hereinafter, a driving method for reducing the moving picture response time (MPRT) and improving the picture quality will be described.

Prior to describing this driving method, a case of low-speed driving at a frame frequency corresponding to the first frequency and a case of high-speed driving at a second frequency higher than the first frequency will be described first. Hereinafter, a high-speed fake driving method will be described in which the frame frequency corresponding to the first frequency is actually used to drive at a low speed, but the speed at the second frequency is higher than the first frequency.

In the present specification, it is assumed that the first frequency, which is a frame frequency for low-speed driving, is 120 Hz and the second frequency, which is a frame frequency for high-speed driving, is 240 Hz, but the present invention is not limited thereto.

FIG. 6 is a diagram illustrating low-speed driving and high-speed driving of the organic light emitting diode display 100 according to the present embodiment. FIG. 7 is a timing chart showing the operation of the organic light emitting diode display 100 according to the present embodiment, (Vdata) or a scan signal (SCAN).

Referring to FIG. 6, in the case of low-speed driving at a frame frequency corresponding to 120 Hz, sub-pixel rows are driven sequentially one frame period.

In the case of high-speed driving driven at a frame frequency corresponding to 240 Hz, two sub-pixel rows are sequentially driven for one frame period.

Therefore, in the case of the 240 Hz driving which is driven at the frame frequency corresponding to 240 Hz, the data driving and the gate driving must be performed twice as fast as the 120 Hz driving. That is, the supply (input) of the data voltage and the scan signal must be performed twice as fast.

Therefore, a high-performance data driver 120 and a gate driver 130 are required to reduce the moving picture response time (MPRT) and improve the picture quality.

However, when the organic light emitting display panel 110 is designed with a large area and a high resolution, since the RC load of the data line DL and the gate line GL is large, a frame frequency (for example, 240Hz).

When the signal waveform shown in FIG. 7 is regarded as a signal waveform of the scan signal SCAN, when the high-speed driving is performed at a frame frequency (for example, 240 Hz) faster than 120 Hz, the voltage of the gate line GL is rapidly changed can not do it.

Therefore, the voltage of the gate line GL at the driving time point may be lower than the desired voltage value by a constant voltage value? V.

Due to such a voltage error, the gate line GL can not be turned on and off at a normal timing, thereby causing a screen abnormal phenomenon.

When the signal waveform shown in FIG. 7 is regarded as a signal waveform of the data voltage (Vdata), data charging can not be performed quickly when the high-speed driving is performed at a frame frequency (for example, 240 Hz) faster than 120 Hz.

Therefore, the voltage charged in the storage capacitor Cst at the time of driving can be lowered by a certain voltage? V than the desired voltage value.

Due to such a data charging error, a screen image phenomenon such as a screen drag phenomenon or an image overlap phenomenon may occur.

The organic light emitting diode display 100 according to the present embodiments can provide a fake high speed driving method which makes it seem as though the high speed driving is performed with the naked eye while actually performing the low speed driving.

8 is a diagram illustrating a high-speed fake driving of the OLED display 100 according to the present embodiments.

Referring to FIG. 8, the organic light emitting display 100 according to the present embodiment is driven at a low driving frame frequency (for example, 120 Hz) and at a high driving frame frequency (for example, 240 Hz) Speed drive that makes it look like it is driving at high speeds.

According to the high-speed fake driving, a fake image that is independent of the actual image can be displayed between image frames in which a real image is displayed according to an actual frame frequency (for example, 120 Hz).

In the present specification, a screen on which a fake image is displayed is also referred to as a "fake frame ".

According to this, the visualized frame frequency may be a value (e.g. 240 Hz) higher than the actual frame frequency (e.g. 120 Hz).

According to such high-speed fake driving, since a fake image is more visible between the actual image and the actual image in the user's eyes, one frame becomes like two frames (image frame, fake frame). As a result, at high speed driving frame frequency (for example, 240 Hz), high-speed driving appears to the naked eye while actually performing low-speed driving at a low driving frame frequency (for example, 120 Hz).

According to this pake high-speed driving, during one frame period defined by an actual frame frequency (for example, 120 Hz) corresponding to a low-speed drive frame frequency, each subpixel can show one of the following light emission state changes have.

(1) Light emitting state to non-light emitting state

(2) Non-light emitting state? Light emitting state? Non-light emitting state

(3) Non-light emitting state → light emitting state

(4) Light emission state → non-light emission state → light emission state

(5) Light emitting state to non-light emitting state

In other words, according to the pake high-speed driving, during one frame period defined by an actual frame frequency (for example, 120 Hz) corresponding to a low-speed driving frame frequency, each subpixel has at least one light emission state change A change to a light emitting state, or a change from a non-light emitting state to a light emitting state).

As described above, since one sub-pixel changes its emission state more than once during one frame period, one frame period can be seen as two or more frame periods with the naked eye.

The above-mentioned fake image is not related to the actual image, and may be, for example, a black image.

According to the above description, while the actual image is displayed at the actual frame frequency, by inserting the black image as the fake image between the actual images, the user can feel as if the image is changing at a higher speed. Therefore, high-speed fake driving can be easily implemented through the black image insertion method.

Referring to FIG. 8, the fast fake driving includes real driving for displaying an actual image and fake driving for inserting (displaying) a fake image between actual images.

Referring to FIG. 8, when a first frame period starts, a plurality of sub-pixel rows sequentially emit light. Here, the drive for emitting a large number of subpixels along the start of each frame period is referred to as "real driving ".

When the first frame period starts and a certain time (? T) elapses, a plurality of subpixel rows are sequentially turned off. Here, the drive for sequentially causing non-emission of a plurality of sub-pixel rows is referred to as "Fake Driving ".

When the second frame period starts, a plurality of subpixel rows are sequentially emitted through real driving.

The above-mentioned real driving is a driving method for displaying an actual image, and proceeds to a general driving method of emitting an organic light emitting diode (OLED) in a sub-pixel of the organic light emitting display panel 110.

For example, real driving can proceed in the following manner.

The first transistor T1 and the second transistor T2 are both turned on and the data voltage Vdata and the reference voltage Vdata are applied to the first node N1 and the second node N2 of the driving transistor DRT, Vref. Thereafter the first transistor T1 is turned off and the second transistor T2 is turned off or the initialization switch SPRE is turned off so that the first node N1 of the driving transistor DRT, And all of the nodes N2 are floated. As a result, the voltages of the first node N1 and the second node N2 of the driving transistor DRT rise. When the voltage of the second node N2 of the driving transistor DRT rises by a voltage value capable of driving the organic light emitting diode OLED, current flows to the organic light emitting diode OLED, .

The fake driving for enabling high-speed fake driving according to the present embodiment is a driving for displaying a fake image and supplies a separate data voltage for displaying a fake image (for example, a black image) from the data driver 120 The drive voltage EVDD or the base voltage EVSS may be controlled instead of the data-based driving.

For example, when a certain time (? T) has elapsed since the real driving starts, the driving voltage is turned OFF through the switch driving or the driving voltage is lower than the threshold voltage of the organic light emitting diode OLED So that the organic light emitting diode OLED in each sub-pixel can be brought into a non-emission state. Alternatively, the driving voltage or the base voltage may be swung so that the driving voltage is lower than the base voltage, so that the organic light emitting diode OLED in each sub-pixel may be in a non-light emitting state.

FIGS. 9 and 10 are diagrams showing the characteristics of fast fake driving of the organic light emitting diode display device 100 according to the present embodiments and the screen change.

As described above, according to the pake high-speed driving according to the present embodiments, during one frame period defined by an actual frame frequency (for example, 120 Hz) corresponding to a low-speed driving frame frequency, each sub- (A change from a light emitting state to a non-light emitting state, or a change from a non-light emitting state to a light emitting state).

As a result, when the screen is viewed at a specific point in time, an actual image is displayed in at least one area, and a fake image is displayed in at least one area.

Referring to FIGS. 9 and 10, when the screen 1010 is viewed at a time t1, an actual image is displayed in an upper region of the screen, a fake image (e.g., a black image) is displayed in a central region of the screen, Actual image is displayed in the area.

Referring to FIGS. 9 and 10, when the screen 1020 is viewed at time t2, an actual image is displayed in an upper portion of the screen, and a fake image (e.g., a black image) is displayed in a lower portion of the screen.

Referring to FIGS. 9 and 10, when a screen 1030 is viewed at time t3, a fake image (e.g., a black image) is displayed in an upper region of the screen, an actual image is displayed in a center region of the screen, A fake image (eg, black image) is displayed in the area.

According to the above-described high-speed fake driving, one subpixel, during the temporal length of one frame period as seen from the viewpoint of one subpixel, is progressively driven to display a real image, The fake driving can be performed.

On the other hand, the time during which the actual image is displayed (i.e., the real driving time) is reduced by the fake driving. Therefore, it is necessary to instantaneously increase the luminance by the amount corresponding to the decrease of the time for displaying the actual image according to the fake image display.

Such an instantaneous luminance increase may act as an electrical stress to the organic light emitting diode (OLED), thereby shortening the lifetime of the organic light emitting diode (OLED).

Therefore, it is necessary to appropriately adjust the length of the fake driving time in consideration of a sudden change in luminance due to the fake driving.

11 is a view showing a case where the drive time lengths of the real driving and the fake driving are the same when the organic light emitting diode display 100 according to the present embodiments is driven at a high speed of a fake.

As shown in Fig. 11, the driving time length RT of the real driving and the driving time length FT of the fake driving may be the same. That is, the length RT of the section in which the actual image is displayed may be equal to the length FT of the section in which the fake image is displayed.

As described above, since the real driving and the fake driving are performed for the same time, the driving timing can be easily controlled.

FIG. 12 is a diagram illustrating a case in which the drive time lengths of the real drive and the fake drive are different from each other during the high-speed fake operation of the organic light emitting diode display 100 according to the present embodiments.

As shown in FIG. 12, the driving time length RT of the real driving and the driving time length FT of the fake driving may be different from each other. That is, the length RT of the section in which the actual image is displayed may be different from the length FT of the section in which the fake image is displayed.

For example, as shown in Fig. 12, the driving time length RT of the real driving may be longer than the driving time length FT of the fake driving. That is, the length RT of the section in which the actual image is displayed may be longer than the length FT of the section in which the fake image is displayed.

As described above, by shortening the fake driving time length (FT) compared to the real driving time length (RT), that is, displaying the fake image (black image) in a shorter time than the actual image, It is possible to reduce the electrical stress applied to the circuit elements of the organic light emitting diode (OLED) and the like in spite of the increase of the brightness, thereby preventing the shortening of the life of the circuit elements such as the organic light emitting diode (OLED).

Hereinafter, the structure of the sub-pixel for high-speed fake driving and the driving method thereof will be described.

FIG. 13 shows a first embodiment of a sub-pixel structure for high-speed pake driving of the organic light emitting diode display 100 according to the present embodiments.

13, the subpixel according to the first exemplary embodiment includes an organic light emitting diode OLED, a driving transistor DRT for driving the organic light emitting diode OLED, a first node N1 of the driving transistor DRT, A storage capacitor Cst electrically connected between the first node N1 and the second node N2 of the driving transistor DRT and a gate electrode of the driving transistor DRT, And a second transistor T2 electrically connected between the second node N2 and the reference voltage line RVL.

Each subpixel is provided with a driving voltage line DVL electrically connected to the third node N3 of the driving transistor DRT and the driving voltage line DVL can be arranged in the direction of the gate line GL have.

That is, in the sub-pixel structure according to the first embodiment, the driving voltage line DVL may be arranged to be connected to the sub-pixels arranged in parallel with the gate line GL and driven by the same gate line GL .

The number of the driving voltage lines DVL in the organic light emitting display panel 110 may be the same as the number of the gate lines GL disposed in the organic light emitting display panel 110. Accordingly, it is possible to drive the gate line GL sequentially and then sequentially control the driving voltage line DVL, thereby enabling high-speed driving of the fakes.

In the subpixel structure according to the first embodiment, for fast fake driving that uses the same frame frequency and provides the effect of high-speed driving, the driving voltage line DVL in some of the frame periods defined by the frame frequency Off state or a driving voltage EVDD lower than the threshold voltage of the organic light emitting diode OLED may be applied to the driving voltage line DVL.

Specifically, the first transistor T 1 is turned on by the scan signal SCAN output from the gate driver 130.

When the first transistor T1 is turned on, the data voltage Vdata is applied to the first node N1 of the driving transistor DRT, and the driving transistor DRT is turned on.

As the driving transistor DRT is turned on, the driving voltage EVDD is applied to the organic light emitting diode OLED through the driving transistor DRT, and the organic light emitting diode OLED emits light.

The driving voltage line DVL is turned off when a first time shorter than the video frame period elapses to display (insert) a fake image for high-speed fake driving after the organic light emitting diode (OLED) Or a driving voltage EVDD lower than the threshold voltage of the organic light emitting diode OLED is applied to the driving voltage line DVL.

For example, when the first time shorter than the video frame period has elapsed, the driving voltage line DVL is switched to be turned off to allow the organic light emitting diode OLED to emit no light.

Therefore, there is an interval in which a subpixel is in a light emitting state and a non-light emitting state in an image frame interval, and a fake image is displayed between actual images, thereby providing an effect that two images are displayed in one image frame interval do.

This enables video response time and image quality close to high-speed operation at a high frame frequency without increasing the frame frequency.

Here, the first time may be shorter than the video frame duration, and may be a time corresponding to 1/2 of the video frame duration.

When the first time corresponds to 1/2 of the video frame period, the actual video and the fake video in one video frame period are displayed for the same time.

On the other hand, when the drive voltage EVDD is switched to drive the sub-pixel to a non-emission state and then a second time shorter than the video frame period elapses, the drive voltage EVDD is switched to turn on the sub-pixel to emit light.

Here, the second time is shorter than the video frame period, and the sum of the first time period and the second time period may be equal to the video frame period length.

That is, one video frame period is divided into a first time period and a second time period, and the driving voltage EVDD is switched on so that the subpixel is in the light emitting state during the first time period, To be in a non-light emitting state.

Accordingly, it is possible to display two images by displaying a real image while a sub-pixel is in a light emitting state in one image frame period and displaying a fake image while the sub-pixel is in a non-light emitting state.

The interval between the light emitting state and the non-light emitting state, that is, the interval in which the actual image is displayed and the interval in which the fake image is displayed, may be set to the same time, or a fake image May be shorter than the section in which the actual image is displayed.

FIGS. 14 and 15 show examples of the scan signal SCAN and the drive voltage EVDD during one image frame period in the sub-pixel structure according to the first embodiment.

FIG. 14 shows a case where an actual image is displayed during one frame period. The scan signal SCAN of a turn-on level voltage (e.g., VGH) is applied and the drive voltage line DVL is turned on ON) state and a driving voltage EVDD (e.g., 12V) higher than the threshold voltage of the organic light emitting diode OLED is applied to the driving voltage line DVL.

Accordingly, when the gate line GL is driven by the scan signal SCAN, the organic light emitting diode OLED emits light according to the data voltage Vdata.

When one half of one video frame period has elapsed, the driving voltage line DVL is turned off and a driving voltage DVL is applied to the organic light emitting diode OLED at a driving voltage EVDD, for example 0V).

Therefore, the voltage of the drain node of the driving transistor DRT becomes lower than the threshold voltage of the organic light emitting diode OLED, so that the organic light emitting diode OLED becomes non-emitting state.

It is possible to easily drive the switch of the driving voltage line DVL by making the time length of the organic light emitting diode OLED equal to that of the light emitting state and the non-light emitting state, Since the actual image and the fake image are displayed, it is possible to provide a video effect close to high-speed driving.

FIG. 15 shows a case where a section in which a fake image is displayed in one image frame section is shorter than a section in which an actual image is displayed.

Referring to FIG. 15, when the scan signal SCAN of the turn-on level voltage is applied and the drive voltage line DVL is ON during a period exceeding 1/2 of one video frame period, The driving voltage EVDD is applied to the voltage line DVL.

When a predetermined time exceeding one half of one image frame period has elapsed, the driving voltage line DVL is turned off and the driving voltage line DVL is lower than the threshold voltage of the organic light emitting diode OLED The driving voltage EVDD is applied so that the organic light emitting diode OLED is in a non-emission state.

By shortening the period in which the organic light emitting diode OLED is in a non-emission state in one image frame period, it is possible to reduce the electric stress of the organic light emitting diode OLED due to a sudden increase in luminance due to high-speed driving of the pace.

In the case of the sub-pixel structure according to the first embodiment, the gate line GL and the driving voltage line DVL are arranged in the same direction, However, there is a problem that luminance unevenness due to a voltage drop may occur in the driving voltage line DVL in the horizontal direction.

The present embodiments provide another structure of the sub-pixel that can solve the luminance unevenness due to such a voltage drop and express the effect of high-speed fake driving.

FIG. 16 shows the structure of the subpixel according to the second embodiment, in which the driving voltage lines DVL are arranged in the direction crossing the gate lines GL, that is, the vertical direction.

Referring to FIG. 16, subpixels arranged in adjacent rows in the organic light emitting display panel 110 constitute N subpixel blocks in the horizontal direction.

When the subpixels arranged in the organic light emitting display panel 110 constitute N subpixel blocks, N driving voltage lines DVL are provided between the subpixels arranged in the (2i-1) -th column and the 2i-th column, .

The driving transistor DRT included in the subpixel arranged in the (2i-1) th column and the driving transistor DRT included in the subpixel disposed in the 2i th column are driven by any one of the N driving voltage lines DVL And is electrically connected to the voltage line (DVL).

At this time, the driving transistors DRT included in the subpixels arranged in the same subpixel block are connected to the same driving voltage line DVL.

For example, when the subpixels arranged in the organic light emitting display panel 110 constitute two subpixel blocks with respect to the center, two subpixels arranged in the first column and two subpixels arranged in the second column have two A driving voltage line (DVL) is disposed.

The driving transistor DRT included in the subpixel arranged in the first block is electrically connected to the first driving voltage line DVL1 of the two driving voltage lines DVL and is included in the subpixel arranged in the second block The driving transistor DRT is electrically connected to the second driving voltage line DVL2.

That is, the subpixel arranged in the first block is supplied with the drive voltage EVDD1 from the first drive voltage line DVL1, and the subpixel arranged in the second block is driven from the second drive voltage line DVL2 to the drive voltage EVDD2.

Accordingly, it is possible to control the sub-pixels arranged in the organic light emitting display panel 110 on a block-by-block basis, thereby enabling fast fake driving.

A description will be made of the high-speed fake driving in the sub-pixel structure according to the second embodiment. A scan signal SCAN of a turn-on level voltage is applied to sequentially drive a plurality of gate lines GL.

When a first time shorter than an image frame period defined by the frame frequency after the gate line GL connected to the sub-pixel disposed in the first block is driven and the sub-pixel is turned on, the first driving voltage line DVL1) to be turned off.

The first driving voltage line DVL1 is turned OFF and the voltage of the drain node of the driving transistor DRT of the subpixel arranged in the first block is lower than the threshold voltage of the organic light emitting diode OLED , The subpixels arranged in the first block are in a non-emission state.

Similarly, the gate line GL connected to the sub-pixel arranged in the second block is driven to turn off the second driving voltage line DVL2 when the sub-pixel is in the light emitting state and the first time elapses, State.

The second driving voltage line DVL2 is turned off so that the sub pixel connected to the second driving voltage line DVL2, i.e., the second block is in the non-light emitting state.

In other words, the subpixel structure according to the second embodiment allows the subpixels to form a subpixel block in the horizontal direction, and the light emission state and the non-light emission state are repeated in block units in one image frame section, So that the image can be displayed.

At this time, if the number of the driving voltage lines DVL disposed between the subpixels is equal to the number of the gate lines GL, the subpixels driven by the same gate line GL constitute one subpixel block.

In this case, as in the first embodiment, the same driving effect as in the case where the driving voltage lines DVL are arranged in the horizontal direction by the number of the gate lines GL, and in the case where the driving voltage lines DVL are arranged in the horizontal direction So that the luminance unevenness due to the voltage drop can be reduced.

Therefore, according to the second embodiment, the driving voltage EVDD is controlled in units of subpixel blocks to provide the effect of high-speed driving of the pak, while the driving voltage lines DVL are arranged in the longitudinal direction to reduce the voltage drop, So that it is possible to prevent luminance unevenness due to the drop.

FIG. 17 shows high-speed fake driving in a sub-pixel structure according to the second embodiment.

Referring to FIG. 17, a scan signal SCAN is sequentially applied to each sub-pixel in an image frame interval defined by a frame frequency.

When each subpixel becomes a light emitting state and a first time shorter than an image frame period has elapsed, the driving voltage line DVL disposed between the subpixels is switched to sequentially turn off.

When the driving voltage line DVL is turned off, the subpixel connected to the driving voltage line DVL is in a state where the voltage of the drain node of the driving transistor DRT is lower than the threshold voltage of the organic light emitting diode OLED Emitting state.

When the subpixel is in a non-emission state and a second time shorter than the video frame period has elapsed, the driving voltage line DVL disposed between the subpixels is switched to be sequentially turned on, So that the subpixel connected to the line DVL is in a light emitting state.

In the subpixel structure according to the second embodiment, the subpixels connected to the driving voltage line DVL are controlled in units of subpixel blocks, so that the subpixels in the non-emission state appear in a block form as shown in FIG.

For example, when the first driving voltage line DVL1 in FIG. 16 is in an OFF state, a non-light emitting region may appear as in 1710, and when the second driving voltage line DVL2 is in an OFF state A non-emission region may be generated as shown in 1720.

Accordingly, the light emission state of the sub-pixel is controlled on a block-by-block basis so that the light emission state and the non-light emission state exist during one image frame period, so that the actual image and the fake image are displayed in one image frame period.

Thus, by driving the gate line GL and the data line DL at the same frame frequency and displaying two images in one image frame, it is possible to obtain an effect close to high-speed driving at a frame frequency higher than the actual frame frequency .

FIGS. 18 and 19 show examples of the scan signal SCAN and the drive voltage EVDD during one image frame period in the sub-pixel structure according to the second embodiment.

FIG. 18 shows a case where the length of a section in which an actual image is displayed and the length of a section in which a fake image is displayed are the same in one image frame section.

Referring to FIG. 18, a scan signal SCAN of a turn-on level voltage is sequentially applied to a gate line GL of a subpixel arranged in the same subpixel block.

The driving voltage line DVL connected to the subpixels arranged in the corresponding subpixel block is in an ON state, so that each subpixel is in a light emitting state.

When each subpixel becomes a light emitting state and a time corresponding to 1/2 of an image frame period has elapsed, the driving voltage line DVL is turned OFF, and each subpixel is in a non-light emitting state.

The driving voltage line DVL maintains the OFF state during the remaining video frame period and the driving voltage line DVL is turned ON when the time corresponding to 1/2 of the video frame period elapses Each sub-pixel becomes a light emitting state.

Accordingly, the light emitting state and the non-light emitting state are repeated for one image frame period in units of subpixel blocks. Since the light emitting state and the non-light emitting state are maintained for the same time, two images are displayed for the same time Thereby providing the same effect as driving at a frame frequency twice as high as the actual frame frequency.

FIG. 19 shows a case where a length of a section in which an actual image is displayed in one video frame interval is longer than a length of a section in which a fake video is displayed.

19, a scan signal SCAN of a turn-on level voltage is sequentially applied to a gate line GL of a subpixel arranged in the same subpixel block and is connected to a subpixel arranged in the corresponding subpixel block Since the driving voltage line DVL is in an ON state, each sub-pixel is in a light emitting state.

When each subpixel becomes a light emitting state and a time period shorter than the video frame period and longer than 1/2 of the video frame period has elapsed, the driving voltage line DVL is turned OFF and placed in the corresponding subpixel block The subpixel becomes a non-emission state.

Since each subpixel repeats a light emitting state and a non-light emitting state during one image frame period, it provides an effect that two images are displayed in one image frame.

At this time, by making the section where the actual image is displayed longer than the section in which the fake image is displayed, the organic light emitting diode (OLED) due to the sudden increase in luminance due to repetition of ON and OFF of the driving voltage line DVL, Can be reduced.

On the other hand, when the light emitting state and the non-light emitting state are repeated through the control of the power source as in the above-described embodiment, the luminance unevenness may occur due to the difference in luminance between the light emitting region and the non-light emitting region.

Even if the same data is input according to the power supply condition, the OLED display 100 may cause uneven brightness (for example, lateral block dim) because the final data transmitted to the driving transistor DRT changes.

The present embodiments are directed to a driving method capable of preventing luminance unevenness due to a luminance difference between a light emitting state region and a non-light emitting state region in high-speed fake driving through power control of the OLED display 100 to provide.

FIG. 20 shows a driving method for preventing the above-described luminance unevenness, and shows that the gain is applied to the data voltage (Vdata) when ON / OFF of the driving voltage EVDD is controlled.

20, when the subpixels arranged in the OLED panel 110 constitute two blocks and two driving voltage lines DVL are arranged between the subpixels, the data voltage Vdata is subjected to gain processing And the like.

The subpixels connected to the first driving voltage line DVL1 are sequentially driven in the period in which the first driving voltage line DVL1 is in the ON state,

When each subpixel becomes a light emitting state and a predetermined time has elapsed, the first driving voltage line DVL1 is turned off, and each subpixel is in a non-light emitting state.

At this time, the data voltage (Vdata_gain2) to which the gain is applied to the data line (DL) in the period in which each subpixel is in a non-emission state, i.e., a period including a period in which the first driving voltage line (DVL1) .

Since the gain applied to the data voltage Vdata may vary depending on the gradation represented by the OFF duty and the data voltage Vdata, a gain according to the data voltage Vdata may be applied by processing the data in the lookup table LUT .

Therefore, by applying the gain-processed data voltage (Vdata_gain2) in the period in which each subpixel is changed from the non-emission state to the light emission state, it is possible to prevent the occurrence of luminance unevenness due to the luminance difference between the light- .

This is an example of the case where the subpixels arranged in the organic light emitting display panel 110 are driven by two subpixel blocks, and in the case of N subpixel driving, the number of gains applied to the data voltage Vdata is also N .

FIG. 21 shows a process of driving the organic light emitting diode display 100 according to the present embodiment.

Referring to FIG. 21, the OLED display 100 according to the present exemplary embodiment sequentially drives the gate line GL in one frame period (S2100) so that each sub-pixel is in a light emitting state .

When each subpixel becomes a light emitting state and a first time shorter than an image frame period passes, the driving voltage line DVL is turned off or the threshold voltage of the organic light emitting diode OLED is set to the driving voltage line DVL A drive voltage EVDD lower than the voltage is applied (S2120).

Therefore, each sub-pixel is maintained in the light emitting state for a first time shorter than the video frame period, and then becomes the non-light emitting state.

When each sub-pixel becomes a non-emission state and a second time shorter than the video frame period passes, the driving voltage line DVL is turned on or the driving voltage line DVL is turned on A drive voltage EVDD higher than the threshold voltage is applied (S2140).

That is, the non-emission state of each subpixel can be maintained for the second time.

Here, the sum of the first time and the second time may be the same as one video frame period, so that there may be a period in which each subpixel is in a light emitting state and a non-light emitting state in one video frame period .

There is a section in which a light emitting state is present in one image frame section, that is, a section in which an actual image is displayed and a section in which a non-light emitting state is present, i.e., a section in which a fake image is displayed. Thereby providing an effect of being driven at a frame frequency higher than the actual frame frequency.

According to the embodiments, power supply to each sub-pixel is controlled so that high-speed driving of a fake in which an actual image and a fake image are displayed in one image frame period is enabled.

At this time, by providing a structure in which the fake high-speed driving can be performed not only in the case where the driving voltage lines DVL are arranged in the horizontal direction but also in the vertical direction, luminance unevenness due to the voltage drop of the driving voltage line DVL can be prevented .

In addition, by applying a gain to the data voltage Vdata in a period in which the driving voltage line DVL is off, luminance unevenness on the screen due to the luminance difference between the light emitting region and the non-emitting region can be prevented, .

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (17)

And an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines are arranged and a plurality of subpixels defined by the gate lines and the data lines are arranged,
Each of the plurality of sub-
A driving transistor for driving the organic light emitting diode; a first transistor electrically connected to a first node of the driving transistor; and a second transistor electrically connected between the first node and the second node of the driving transistor, And a driving voltage line arranged in a direction of the gate line and electrically connected to a third node of the driving transistor,
Wherein a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to the driving voltage line in a part of an image frame section defined by a frame frequency.
The method according to claim 1,
Wherein the number of the driving voltage lines is equal to the number of the gate lines and each driving voltage line is electrically connected to a driving transistor included in a sub pixel driven by the same gate line.
The method according to claim 1,
When a scan signal having a turn-on level voltage is applied to a gate node of the first transistor and a first time shorter than the video frame period elapses, a drive voltage lower than a threshold voltage of the organic light emitting diode An organic light emitting diode (OLED).
The method according to claim 1,
When a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to the driving voltage line and a second time shorter than the video frame period elapses, a driving voltage higher than a threshold voltage of the organic light emitting diode is applied to the driving voltage line The organic light emitting display device comprising:
The method according to claim 1,
Wherein a data voltage to which a gain according to a gradation represented by a data voltage is applied is supplied to the data line during a period in which a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to the driving voltage line.
The method according to claim 1,
Wherein the length of the partial section is shorter than or equal to 1/2 of the length of the video frame section.
The method according to claim 1,
And a driving voltage applied to the driving voltage line is 0V in a certain section.
An organic light emitting diode (OLED) display device, comprising: a plurality of gate lines and a plurality of data lines; a plurality of subpixels including an organic light emitting diode and a driving transistor defined by the gate lines and the data lines, Panel,
N driving voltage lines are arranged between the subpixels arranged in the (2i-1) -th column and the 2i-th column,
The driving transistor included in the sub-pixel arranged in the (2i-1) -th row and the driving transistor included in the sub-pixel disposed in the 2i-th column are electrically connected to any one of the N driving voltage lines Display device.
9. The method of claim 8,
Wherein the plurality of subpixels constitute N subpixel blocks in units of subpixels arranged in two or more adjacent rows,
and the driving transistor included in the subpixel included in the kth subpixel block is electrically connected to the kth driving voltage line among the N driving voltage lines.
9. The method of claim 8,
Wherein a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to some driving voltage lines of the N driving voltage lines in a part of one frame period defined by the frame frequency.
11. The method of claim 10,
Wherein a time point at which a driving voltage lower than a threshold voltage of the organic light emitting diode starts to be applied to the N driving voltage lines is different for each driving voltage line.
11. The method of claim 10,
Wherein a driving voltage higher than a threshold voltage of the organic light emitting diode is applied to the driving voltage line when a predetermined time elapses after a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to the driving voltage line.
11. The method of claim 10,
Wherein a data voltage to which a gain according to a gradation indicated by a data voltage is applied is applied to the data line during a period when a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to the driving voltage line.
A plurality of gate lines;
A plurality of data lines arranged to cross the gate lines;
A plurality of driving voltage lines arranged in the direction of the gate lines; And
A first transistor electrically connected to a first node of the driving transistor, and a second transistor electrically connected to the first node of the driving transistor, A plurality of subpixels including storage capacitors electrically coupled between the first node and the second node,
Wherein the driving voltage line is electrically connected to a third node of the driving transistor and a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to the driving voltage line in a part of an image frame section defined by a frame frequency Organic light emitting display panel.
A plurality of gate lines;
A plurality of data lines arranged to cross the gate lines;
A plurality of subpixels defined by the gate lines and the data lines and including driving transistors for driving the organic light emitting diodes and the organic light emitting diodes; And
And N driving voltage lines arranged between the subpixels arranged in the (2i-1) -th column and the 2i-th column,
The driving transistor included in the sub-pixel arranged in the (2i-1) -th column and the driving transistor included in the sub-pixel disposed in the 2i-th column are electrically connected to any one of the N driving voltage lines,
Wherein a driving voltage lower than a threshold voltage of the organic light emitting diode is applied to some driving voltage lines of the N driving voltage lines in a part of one frame period defined by the frame frequency.
Sequentially driving each gate line arranged in the OLED display panel in an image frame interval defined by a frame frequency;
Sequentially applying a driving voltage lower than a threshold voltage of the organic light emitting diode to a driving voltage line when a first time shorter than the image frame period elapses; And
Sequentially applying a driving voltage higher than a threshold voltage of the organic light emitting diode to the driving voltage line when a second time shorter than the image frame period elapses
And a driving method of the organic light emitting display device.
15. The method of claim 14,
Wherein the sum of the first time and the second time is equal to the length of the image frame period.

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