KR20170003284A - Controller, organic light emitting display panel, organic light emitting display device, and the method for driving the organic light emitting display device - Google Patents

Abstract

The embodiments of the present invention enable the power-off process to be completed more quickly by displaying a special screen over a predetermined threshold luminance value for a predetermined special display time or longer after the generation of the power-off signal on the organic light emitting display panel, A controller, an organic light emitting display panel, an organic light emitting display, and the like, which can prevent or reduce the afterimage phenomenon that may occur after the power-off process and can quickly perform the power- Driving method.

Description

Technical Field [0001] The present invention relates to an organic light emitting display, a controller, an organic light emitting display panel, an organic light emitting display, and a method of driving the same. BACKGROUND ART [0002]

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

2. Description of the Related Art In recent years, an organic light emitting diode (OLED) display device that has been popular as a display device has advantages of high response speed, high luminous efficiency, high brightness, and wide viewing angle by using an organic light emitting diode (OLED)

The organic light emitting display device arranges a plurality of subpixels including the organic light emitting diode and controls the brightness of the subpixels selected by the scan signal according to the gray level of the data.

In this way, the organic light emitting display device applies various voltages to the organic light emitting display panel to drive each sub pixel.

On the other hand, after the power-off signal is generated, the organic light emitting display device performs power-off processing for various voltages applied to the OLED display panel and logic voltages used in other electronic components (e.g., a timing controller).

The conventional organic light emitting display device has a problem in that although the power off process is proceeding according to the generation of the power off signal as described above, .

In addition, if a power-on signal occurs immediately after the power-off signal is generated, the screen is not immediately displayed, and the screen starts to be displayed after a long time.

An object of these embodiments is to provide a controller, an organic light emitting display panel, an organic light emitting display, and a driving method thereof, which can prevent or reduce the appearance of an image or the like that is displayed before a power off signal is generated after a power off signal is generated .

It is another object of the embodiments of the present invention to provide a controller, an organic light emitting display panel, an organic light emitting display device, and a driving method thereof, which can display a screen immediately without generating a large delay even after a power- Method.

One embodiment includes an organic light emitting display panel in which a plurality of data lines and a plurality of gate lines are disposed and in which a plurality of subpixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode are disposed, A data driver for driving a line, and the like can be provided.

The organic light emitting display panel of the organic light emitting display may display a special screen which may be a bright screen having a predetermined threshold luminance value or more for a predetermined special screen display time or more after the generation of the power off signal.

To this end, the data driver can output a data voltage for display of a special screen in the organic light emitting display panel.

Such an OLED display may perform a power-off process on a driving voltage applied to the OLED display panel after a special screen is displayed for a time longer than a special display time in the OLED display panel.

Another embodiment is directed to an organic light emitting display comprising a plurality of data lines carrying data voltages, a plurality of gate lines carrying gate signals, a plurality of organic light emitting diodes, a driving transistor for driving the organic light emitting diodes, An organic light emitting display panel including subpixels can be provided.

In such an organic light emitting display panel, subpixels of a plurality of subpixels of a certain ratio or more may have a luminance higher than a predetermined threshold luminance value after the generation of the power off signal.

According to another embodiment of the present invention, there is provided an organic light emitting diode display comprising: an organic light emitting display panel having a plurality of data lines and a plurality of gate lines arranged therein and having a plurality of subpixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode; And a data driver for outputting a data voltage equal to or greater than a predetermined threshold voltage value to at least one data line after the generation of the signal.

Another exemplary embodiment of the present invention includes the steps of sensing generation of a power-off signal, displaying a special screen having a predetermined threshold luminance value or more for a time longer than a predetermined special screen display time, And a step of processing a predetermined off sequence after a special screen of a predetermined threshold luminance value or more is displayed on the organic light emitting display panel over a predetermined special screen display time or longer. Can be provided.

Another embodiment of the present invention provides a display device including a sensing unit for sensing generation of a power off signal and a control unit for controlling the display unit to display a special screen having a predetermined threshold luminance value or more for a predetermined period of time, , And a data output unit for outputting data for display of the special screen.

As described above, according to the embodiments of the present invention, it is possible to provide a controller capable of preventing or reducing the appearance of an image or the like which is displayed before the power-off signal is generated after the power-off signal is generated, Apparatus and a driving method thereof.

In addition, according to the present embodiments, a controller, an organic light emitting display panel, an organic light emitting display, and a driving method thereof, which enable a screen to be displayed immediately without generating a large delay even after a power- Can be provided.

FIG. 1 is a diagram schematically illustrating a system configuration of an organic light emitting display according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a view illustrating a sub-pixel structure of an OLED display according to an embodiment of the present invention. Referring to FIG.
3 is a flowchart illustrating a method of driving an organic light emitting display according to an embodiment of the present invention.
FIG. 4 is a graph showing changes in AC power, driving voltage, and logic voltage according to the driving method of the OLED display according to the present embodiments.
5 is a view illustrating a drive voltage discharge path in a sub-pixel according to a driving method of an organic light emitting display according to the present embodiments.
FIGS. 6 to 9 are exemplary views of a special screen displayed on the organic light emitting display panel after the power-off signal is generated according to the driving method of the organic light emitting display according to the present embodiments.
10 is a block diagram of a controller for providing a method of driving an organic light emitting display according to the present embodiments.
11 is a view illustrating a data driver for providing a method of driving an OLED display according to the present invention.
FIG. 12 is a diagram illustrating a phenomenon of afterimage when the method of driving the organic light emitting display according to the present embodiments is not used.
Fig. 13 is a diagram showing the afterimage-improving effect when power-off processing is performed after bright-screen display after power-off signal generation.
14 is a diagram showing an afterimage-improving effect when power-off processing is performed after black-screen display after power-off signal generation.
Fig. 15 is a graph showing a graph of a change in main voltage in the case of performing the power-off process after the bright screen display and the case of performing the power-off process after displaying the black screen after the power-off signal is generated.
Fig. 16 is a diagram showing the timing of the next power-on processing in the case where the power-off processing is performed after the bright screen display and the case where the power-off processing is performed after the black screen display after the power-off signal is generated.
17 is another example of the sub-pixel structure of the organic light emitting diode display according to the present embodiments.
18 is a diagram illustrating a subpixel compensation circuit of the OLED display according to the present embodiments.
FIG. 19 is a flowchart illustrating a method of driving an organic light emitting display according to an embodiment of the present invention when the organic light emitting display has a sensing function for subpixel compensation.
20 is an exemplary diagram illustrating that a data driver outputs a data voltage when the organic light emitting display according to the present embodiments performs a sensing function for subpixel compensation.

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 schematically showing a system configuration of an organic light emitting diode display 100 according to the present embodiments. Referring to FIG.

1, the OLED display 100 according to the present embodiment includes an organic light emitting display panel 110 having a plurality of data lines and a plurality of gate lines, A data driver 120 for driving a plurality of data lines, a gate driver 130 for driving a plurality of gate lines, a controller 140 for controlling the data driver 120 and the gate driver 130, and the like .

In the organic light emitting display panel 110, a plurality of subpixels may be arranged in a matrix type, each subpixel being connected to at least one data line and at least one gate line, To the signal line.

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

The data driver 120 may be located only on one side of the organic light emitting display panel 110 as shown in FIG. 1, depending on the driving method and the panel designing method, and may be positioned on both sides You may.

The gate driver 130 sequentially drives the plurality of gate lines by sequentially supplying the scan signals to the plurality of gate lines. Here, the gate driver 130 is also referred to as a "scan driver ".

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 may be a timing controller that controls the operation timings of the data driver 120 and the gate driver 130 or may include a timing controller and other control modules.

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 suitable time according to the scan.

The gate driver 130 sequentially supplies the scan signals of the On-voltage or the Off-voltage to the plurality of gate lines in accordance with the control of the controller 140 to sequentially drive the plurality of gate lines do.

1, the gate driver 130 may be located on only one side of the organic light emitting display panel 110, or may be located on both sides, depending on the driving method, the panel designing method, and the like.

In addition, the gate driver 130 may include one or more gate driver integrated circuits (GDICs) 132.

Each gate driver integrated circuit 132 is connected to a bonding pad of the organic light emitting display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) Gate In Panel) type and may be directly disposed on the organic light emitting display panel 110 or may be integrated on the organic light emitting display panel 110 according to circumstances.

Each gate driver integrated circuit 132 may be implemented by a chip on film (COF) method. In this case, each of the gate driver integrated circuits 131 may be mounted on the film 131. Here, the film 131 may be a flexible film.

Each gate driver integrated circuit 132 may include a shift register, a level shifter, and the like.

The data driver 120 converts image data Data received from the controller 140 into analog data voltages Vdata and supplies the data voltages to a plurality of data lines so that a plurality of data lines .

The data driver 120 may include at least one source driver integrated circuit (SDIC) 122 to drive a plurality of data lines.

Each source driver integrated circuit 122 is connected to a bonding pad of the organic light emitting display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) May be directly disposed on the display panel 110, and may be integrated and disposed on the organic light emitting display panel 110, as the case may be.

In addition, each source driver integrated circuit 122 may be implemented by a chip on film (COF) method. In this case, each source driver integrated circuit 122 is bonded to at least one source printed circuit board 160 and the other end is connected to a film 121 ). ≪ / RTI > Here, the film 121 may be a flexible film.

Each source driver integrated circuit 122 may include a logic portion including a shift register, a latch circuit, etc., a digital analog converter (DAC), an output buffer, and the like, (For example, a threshold voltage and a mobility of the driving transistor, a threshold voltage of the organic light emitting diode, a luminance of the subpixel, and the like) of the subpixel.

On the other hand, the controller 140 outputs various kinds of signals including the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the input data enable signal (DE), and the clock signal (CLK) Timing signals from the outside (e.g., the host system).

The controller 140 may convert the input image data input from the outside into the data signal format used by the data driver 120 to output the converted image data Data, A horizontal synchronizing signal Hsync, an input DE signal, a clock signal, and the like, and generates various control signals to control the data driver 120 and the gate driver 130, (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.

The controller 140 further includes a source start pulse SSP and a source sampling clock SSC to control the data driver 120 and 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.

Referring to FIG. 1, the controller 140 includes a source PCB 160 and a flexible flat cable (FFC) or a flexible printed circuit (FPC) (Control Printed Circuit Board) 170 connected via a connection medium 180 such as a printed circuit.

A power controller (not shown) for controlling various voltages or currents to supply or supply various voltages or currents to the organic light emitting display panel 110, the data driver 120, the gate driver 130, 150 may be further disposed.

The source printed circuit board 160 and the control printed circuit board 170 described above may be a single printed circuit board.

The OLED display 100 may further include a power management unit 190 for supplying and managing all the power sources used in the organic light emitting diode display 100.

The power management unit 190 may be located on the control printed circuit board 170 or separately on the outside of the control printed circuit board 170.

The power controller 190 and the power controller 150 located on the control printed circuit board 170 may be separately configured or integrated.

2 is an exemplary view of a sub-pixel structure of the OLED display 100 according to the present embodiments.

Referring to FIG. 2, in the OLED display 100 according to the present embodiment, each sub-pixel basically includes an organic light emitting diode (OLED) and an organic light emitting diode (OLED) A switching transistor SWT for transferring the data voltage to the first node N1 of the driving transistor DRT and a data voltage corresponding to the video signal voltage, And a storage capacitor (Cst) that holds the corresponding voltage for one frame time.

The organic light emitting diode OLED may include a first electrode (e.g., an anode electrode), an organic layer, and a second electrode (e.g., a cathode electrode).

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

The first node N1 of the driving transistor DRT may be connected to the first electrode of the organic light emitting diode OLED and may be a source node or a drain node.

The second node N2 of the driving transistor DRT may be connected to the source node or the drain node of the switching transistor SWT and may be a gate node.

The third node N3 of the driving transistor DRT may be connected to a driving voltage line DVL for supplying a driving voltage EVDD and may be a drain node or a source node.

The driving transistor DRT and the switching transistor SWT may be implemented as an n-type or a p-type as illustrated in FIG.

The switching transistor SWT is connected between the data line DL and the second node N2 of the driving transistor DRT and can be controlled by receiving the scan signal SCAN through the gate line to the gate node.

The switching transistor SWT may be turned on by the scan signal SCAN to transfer the data voltage Vdata supplied from the data line DL to the second node N2 of the driving transistor DRT.

On the other hand, when the power-off signal is generated, the OLED display 100 proceeds to the power-off process. During this power-off process, individual power-off processes for various kinds of voltages can be performed.

With regard to such power-off processing, although the power-off processing is proceeding, a phenomenon that an image or the like displayed before the power-off signal is generated may appear as a residual image even after the power-off processing proceeds. This phenomenon is referred to as "afterimage phenomenon" in the present specification.

When the power-on signal is generated while the power-off process is in progress, that is, when the individual power-off processes for various kinds of voltages are not completed, when the power-off process that has been completed is completed If all the power-off processes in progress have been completed, the power-on process can be started to start the video driving. This phenomenon is referred to as "on-time delay phenomenon" in the present specification.

Accordingly, the organic light emitting diode display 100 according to the present embodiment can eliminate the after-image phenomenon occurring after the power-off process and the on-time delay phenomenon when the power-on signal is generated in a state where the power- It is possible to provide a solution that can be relaxed.

To this end, the organic light emitting diode display 100 according to the present exemplary embodiment displays a special screen (threshold brightness) of a predetermined threshold luminance value (threshold brightness) or more for a predetermined special display time or longer And is displayed on the organic light emitting display panel 110.

The driving for displaying the special screen (Special Screen) on the organic light emitting display panel 110 beyond the predetermined threshold luminance value (critical brightness) for a predetermined special display time or longer after the generation of the power off signal is called & Special Display Driving ".

The special screen (special image) described in this specification means a screen that the user can feel overall bright. In this specification, the term "screen" means to be displayed on the organic light emitting display panel 110.

The data driver 120 may output a data voltage for displaying a special screen in order to display a special screen having a predetermined threshold luminance value or more on the organic light emitting display panel 110. [

In the present specification, a special screen having a threshold luminance value or more is also referred to as a "bright screen" or "bright image ".

As a special screen having a predetermined threshold luminance value or more is displayed on the organic light emitting display panel 110, the luminance of all of the plurality of subpixels arranged in the organic light emitting display panel 110 is equal to or more than a predetermined threshold luminance value, The brightness of the subpixels of a certain ratio or more among the plurality of subpixels disposed on the panel 110 may be equal to or greater than a predetermined threshold brightness value.

For example, assuming that the luminance range is 0 to 255 Gray Scale, the critical luminance value may be 125 scale scale. In addition, a certain ratio may be, for example, a ratio value of 50% or more.

In order to display a special screen having a predetermined threshold luminance value or more on the organic light emitting display panel 110, the data driver 120 supplies a data voltage equal to or greater than a predetermined threshold voltage value to at least one data line As shown in FIG.

Here, the threshold voltage value is a data voltage value corresponding to the threshold luminance value.

As described above, after the generation of the power-off signal, a special screen of a threshold luminance value or more is displayed on the organic light-emitting display panel 110 for a predetermined special display time or longer, thereby preventing or reducing the after- In addition to this, the power-off process can be completed more quickly, which can greatly reduce the chance of on-time delay.

Hereinafter, a driving method of the organic light emitting diode display 100 according to the present embodiments will be described in more detail.

3 is a flowchart illustrating a driving method of the OLED display 100 according to the present embodiment. FIG. 4 is a graph showing changes in the AC power source, the driving voltage EVDD, and the logic voltage VDD according to the driving method of the OLED display 100 according to the present embodiments.

3 and 4, a method of driving the organic light emitting display 100 according to the present invention includes: displaying a normal display screen according to a normal display driving; A step S310 of detecting generation of a power off signal and a special display driving so that the organic light emitting display panel 110 displays a predetermined threshold luminance value or more for a time equal to or longer than a predetermined special screen display time Tsd Displaying a special screen (Special Screen or Special Display Screen) (S320), processing a predetermined off sequence (S330), and the like.

The power-off signal detected in step S310 may be generated when the user inputs a power button of the remote controller or the organic light emitting display 100. When the input receiving module (not shown) of the organic light emitting display 100 detects do.

Referring to FIGS. 3 and 4, when an input receiving module (not shown) detects the occurrence of a power-off signal, the AC power is turned off by the power management unit 190.

Then, the control signal AC_DET indicating the on / off state of the AC power is dropped from the high level to the low level by the input receiving module (not shown) or the power management unit 190.

The controller 140 receives the control signal AC_DET to sense the occurrence of the power-off signal.

In step S320, the controller 140 controls the organic light emitting display panel 110 to display a special screen having a predetermined threshold luminance value or more for a time equal to or longer than a predetermined special screen display time Tsd And outputs the data to the data driver 120.

At this time, the controller 140 may determine the type of the special screen, and may output data corresponding to the determined type.

In step S330, processing the off sequence may mean a power-off process, and may include a plurality of individual power-off processes for various voltages.

(Light image) that is greater than or equal to the threshold luminance value for a predetermined period of time (Tsd) or longer after the generation of the power-off signal, the driving method of the OLED display 100 according to the above- Off phenomenon occurring after the power-off process can be prevented or reduced. In addition, the power-off process can be completed more quickly, thereby causing an on-time delay phenomenon to occur The possibility can be greatly reduced.

As described above, in step S330, the organic light emitting diode display 100 may perform power off processing for various voltages. For example, the driving voltage EVDD applied to the organic light emitting display panel 110 may be, It is possible to perform a power-off process for the power-off state.

In this regard, the power management unit 190 detects a special screen for a time longer than the special screen display time Tsd in the organic light emitting display panel 110, and detects a driving voltage applied to the organic light emitting display panel 110 Off process for the power supply voltage (EVDD). Accordingly, the driving voltage EVDD applied to the organic light emitting display panel 110 drops to the base value EVDD_0.

In other words, after the special screen is displayed during the special screen display time Tsd on the organic light emitting display panel 110, the driving voltage supply node to the organic light emitting display panel 110 (the third node N3, Is lowered to a predetermined base value EVDD_0 after a predetermined time Tvd has elapsed.

The power management unit 190 may perform a power-off process on the logic voltage VDD used in the controller 140 or the like after performing the power-off process on the drive voltage EVDD. At this time, the logic voltage VDD used in the controller 140 or the like drops to the base value VDD_0.

As described above, after the generation of the power-off signal, a special screen (bright image) which is not less than the threshold luminance value for more than the predetermined special screen display time Tsd is displayed on the organic light emitting display panel 110, The various voltages used in the OLED display 100 are quickly turned off so that the possibility of on-time delay phenomenon can be greatly reduced even when the power-on signal is generated as quickly as possible.

4, after a special screen is displayed for more than the special screen display time Tsd in the organic light emitting display panel 110, a power off process for the driving voltage EVDD applied to the organic light emitting display panel 110 The driving voltage EVDD applied to the organic light emitting display panel 110 falls to the base value EVDD_0.

At this time, since a special screen (bright image) of a threshold luminance value or more is displayed on the OLED display panel 110, the driving voltage EVDD can be lowered to the base value EVDD_0 at a very high speed. That is, the driving voltage EVDD is lowered to the base value EVDD_0 in this case means that the driving voltage EVDD is turned off.

The reason why the driving voltage EVDD is turned off at a very high speed in this way will be described with reference to Fig.

5 is a view illustrating a drive voltage discharge path in a sub-pixel according to the driving method of the OLED display 100 according to the present embodiments.

5, in order that a special screen (bright screen) having a predetermined threshold luminance value or more is displayed on the OLED display panel 110 after the power-off signal is generated, the data driver 120 sets a predetermined threshold voltage value The data voltage Vdata of the threshold voltage value Va or more is applied to the second node N2 of the driving transistor DRT.

Accordingly, when the driving transistor DRT is turned on and the driving transistor DRT turned on at the driving voltage supply node N3 or its connection node and the OLED through the organic light emitting diode OLED, A current path is formed up to the node to which the low voltage is applied, and the organic light emitting diode OLED emits bright light even after the power off signal is generated.

As a result, the driving voltage EVDD rapidly lowers and is turned off.

In this specification, the driving voltage EVDD is also referred to as a driving voltage discharge in this specification.

In this sense, a current path formed from the driving transistor DRT turned on at the driving voltage supply node N3 or its connection node to the base voltage applying node to which the base voltage EVSS is applied through the organic light emitting diode OLED Quot; driving voltage discharge path ".

6 to 9 illustrate examples of a special screen displayed on the organic light emitting display panel 110 after the power off signal is generated according to the driving method of the organic light emitting display 100 according to the present embodiments Case 1, Case 2, Case 3, and Case 4).

Referring to FIG. 6, while the normal display screen is being displayed, depending on the generation of the power-off signal, the threshold luminance displayed on the organic light emitting display panel 110 through the special display driving (Special Display Driving) Value may be a screen in which the luminance of all the subpixels in the organic light emitting display panel 110 is equal to or greater than the individual threshold luminance value (Case 1).

In Case 1, all the subpixels are bright subpixels, and the special screen corresponds to the entire bright region.

Here, the luminance of each of all the subpixels is equal to or greater than the individual threshold luminance value, and the total luminance of the special screen may be a luminance value obtained by averaging the luminance of each of the subpixels arithmetically. Becomes equal to or greater than the individual threshold luminance value.

In Case 1, the individual threshold luminance value serving as the luminance reference of each subpixel and the threshold luminance value serving as the luminance reference of the entire special screen may be set to the same value.

As described above, when a special screen corresponding to a bright region of the entire area is displayed, special display driving is very easy and simple.

Referring to FIG. 7, while the normal display screen is being displayed, depending on the generation of the power-off signal, the threshold luminance displayed on the organic light emitting display panel 110 through the special display driving (Case 2), the luminance of the subpixels of a certain ratio (R) or more among all the subpixels in the organic light emitting display panel 110 is equal to or greater than the individual threshold luminance value.

Here, a certain ratio (R) is a ratio of subpixels having a luminance equal to or greater than a predetermined threshold luminance value so that a special screen is bright among all the subpixels in the organic light emitting display panel 110.

The constant ratio R may be a value obtained by dividing the number of subpixels having a luminance equal to or greater than the individual threshold luminance value by the total number of subpixels, for example, 0.5 or more.

For example, when a certain ratio is 3/4, the luminance of three subpixels among the four subpixels may be equal to or greater than the individual threshold luminance value, and the luminance of one subpixel may be less than the individual threshold luminance value.

When the subpixels of a certain ratio (R) or more among all the subpixels in the organic light emitting display panel 110 have a luminance equal to or greater than the individual threshold luminance value and the remaining subpixels have the luminance lower than the individual threshold luminance value, The total luminance of the special screen may be a luminance value obtained by averaging the luminance of each subpixel arithmetically, and the total luminance of the special screen thus calculated should be equal to or greater than the threshold luminance value.

Therefore, a certain ratio should be set to the individual threshold luminance value such that the total luminance of the special screen is equal to or greater than the threshold luminance value.

In Case 2, the threshold luminance value as a reference of the total luminance of the special screen may be equal to or different from the threshold luminance value as a reference of the total luminance of the special screen in Case 1.

As described above, when a special screen is displayed such that the luminance of the subpixels of a certain ratio (R) or more among all the subpixels is equal to or greater than the individual threshold luminance value and the total luminance is equal to or greater than the threshold luminance value, The special display driving can be somewhat complicated, but it can be controlled so as not to be displayed too bright, as compared with the case where the specific threshold luminance value is set to be equal to or greater than the individual threshold luminance value. I can do it.

Referring to FIG. 8, while the normal display screen is being displayed, the threshold luminance (luminance) displayed on the organic light emitting display panel 110 through the special display driving (Case 3) may be a screen in which the luminance of the outer region of the specific image region 800 in the organic light emitting display panel 110 is equal to or higher than the threshold luminance value.

Referring to FIG. 8, subpixels located in a specific image area 800 where the letter "OLED" is displayed in the organic light emitting display panel 110 are dark subpixels showing luminance lower than individual threshold luminance values, The subpixels located in the outer region of the display panel 800 are bright subpixels showing a luminance of more than the individual threshold luminance value.

Referring to FIG. 8, a specific image area 800 in which the letter "OLED" is displayed in the organic light emitting display panel 110 has a luminance lower than the threshold luminance value, such that the total luminance of the special screen is equal to or greater than the threshold luminance value, The outer area of the specific image area 800 has a luminance equal to or higher than the threshold luminance value.

In this regard, the size of the specific image area 800 in the organic light emitting display panel 110 needs to be controlled so that the total luminance of the special screen is equal to or greater than the threshold luminance value.

As described above, the luminance of the specific image area 800, in which any character, symbol, company log, or the like is displayed, is set to be less than the threshold luminance value, and the peripheral area of the specific image area 800 is set to be equal to or greater than the threshold luminance value, In the case of displaying a special screen on the screen, the driving (special display driving) for this can be somewhat complicated, but a bright screen (special screen) which may be unnecessary for the user after the power- It is possible to make the user feel that the screen is normally displayed on the screen, and to prevent the screen from being mistaken for the abnormal screen phenomenon.

Referring to FIG. 8, while the normal display screen is being displayed, the threshold luminance (luminance) displayed on the organic light emitting display panel 110 through the special display driving (Case 4), the image displayed before the power-off signal is displayed equally, but the brightness is higher than the threshold brightness value before the power-off signal is generated (Case 4).

As described above, after the power-off signal is generated, the screen displayed prior to the power-off signal is maintained, but only the luminance is brighter than the threshold luminance value to realize the special screen, Special display driving) is convenient and easy, and there is an advantage that the user can not feel the screen image before and after the power-off signal is generated.

On the other hand, the special screen display process after the power-off signal is generated can be controlled by the controller 140. [

The controller 140 senses the occurrence of a power-off signal and outputs data for displaying the special screen to the data driver 120 in order to perform special screen display processing after the power-off signal is generated.

By using such a controller 140, it is possible to prevent or reduce the afterimage phenomenon occurring after the power-off process by displaying a special special screen which is brighter than the threshold luminance value after the power-off signal is generated for a predetermined special screen display time In addition, the power-off process can be completed more quickly, which significantly reduces the chance of on-time delay.

In the following, this controller 140 will be described in more detail.

10 is a block diagram of a controller 140 for providing a method of driving the organic light emitting display 100 according to the present embodiments.

10, the controller 140 for providing the driving method of the OLED display 100 according to the present invention includes a data input unit 1010 for receiving input data to an external host system 1000, A memory 1020 for storing input data, a sensing unit 1030 for sensing the generation of a power-off signal, and a control unit 1030 for sensing the occurrence of a power- And a data output unit 1050 for outputting data for display of a special screen according to the control unit 1040. The control unit 1040 controls the display unit 1040 to display a special screen having a threshold luminance value or more.

The control unit 1040 determines the types of special screens (Case 1, Case 2, Case 3, and Case 4) and newly generates data for display of the determined types of special screens (Case 1, Case 2, and Case 3) , Data for displaying the special screen can be generated by changing the data that has been output (Case 4).

The control unit 1040 may transmit the generated data to the data output unit 1050 or store the generated data in the memory 1020 in order to display the special screen.

The data output unit 1050 may output the data transferred from the control unit 1040 or may read and output data stored in the memory 1020 by the control unit 1040. [

On the other hand, after the data is outputted from the data output unit 1050 for displaying the special screen, the control unit 1040 sends a special screen display end signal to the power management unit 190 after a predetermined time (Tsd, for example) .

In this case, the power management unit 190 can proceed with the power-off process.

The power management unit 190 counts a predetermined time (Tsd, for example) from the time of generating the power-off signal, and outputs the special screen as the special screen display time The power-off process can be performed at a predetermined timing.

As described above, it is possible to prevent or reduce the afterimage phenomenon occurring after the power-off process, as well as to allow the power-off process to be completed more quickly, thereby greatly reducing the possibility of on- The controller 140 can be provided.

11 is a diagram illustrating a data driver 120 for providing a driving method of the OLED display 100 according to the present embodiments.

Referring to FIG. 11, after the generation of the power-off signal, the data driver 120 supplies a data voltage equal to or greater than a predetermined threshold voltage value to the OLED display panel 110, And output to the data line.

Here, the threshold voltage value may be a data voltage value corresponding to the individual threshold luminance value of the corresponding subpixel.

The number of data lines to which the data voltage higher than the threshold voltage value is output by the data driver 120 may vary depending on the types of special screens (Case 1, Case 2, Case 3, and Case 4).

For example, when the special screen is Case 1, the data driver 120 can output data voltages of a threshold voltage or more to all the data lines.

For example, when the special screen is Casde 2, the data driver 120 outputs a data voltage equal to or greater than the threshold voltage value to some of the data lines and a data voltage less than the threshold voltage value Can be output.

11, when supplying the corresponding data voltage to each of the sub-pixels SP1, SP2, ..., SPn arranged in an arbitrary i-th row Row, the data driver 120 supplies all the data lines (Vdata 1, Vdata 1, Vdata 1, Vdata 2, Vdata 1, Vdata 1, Vdata 1, Vdata 2, Vdata 1, (Vdata 2, Vdata 4, ..., Vdata n) that are less than the threshold voltage value Va are output to the remaining data lines DL3, ..., DLn-1. , Vdata n-1).

12 is a view showing a phenomenon of afterimage when the method of driving the organic light emitting diode display 100 according to the present invention is not used.

Referring to FIG. 12, the OLED display 100 performs a power-off process when a power off signal occurs while displaying a normal display screen according to the normal display driving. During this power-off process, individual power-off processes for various kinds of voltages can be performed.

With regard to such power-off processing, a "afterimage phenomenon" in which an image or the like displayed before the power-off signal is generated may appear as a residual image even after the progress of the power-off processing is completed.

The after-image phenomenon occurring after the power-off signal is generated may occur because the driving voltage EVDD applied to the organic light emitting display panel 110 is not completely turned off as described above with reference to FIG.

Fig. 13 is a diagram showing the afterimage-improving effect when power-off processing is performed after bright-screen display after power-off signal generation.

Referring to FIG. 13, when the power-off signal is generated while the normal display screen is being displayed according to the normal display driving, the organic light emitting display device 100 according to the present embodiment is driven by a special display It is possible to eliminate or reduce the afterimage phenomenon by quickly turning off the driving voltage EVDD or the like applied to the organic light emitting display panel 110 by displaying a bright special screen over a predetermined threshold luminance value for a predetermined special screen time.

14 is a diagram showing an afterimage-improving effect when power-off processing is performed after displaying a black screen after a power-off signal is generated.

Referring to FIG. 14, after generating the power-off signal, a special screen corresponding to a black screen (black image) less than a critical luminance value is displayed instead of displaying a special screen corresponding to a bright screen (bright image) So that the afterimage phenomenon can be eliminated or mitigated.

Fig. 15 is a graph showing a graph of a change in main voltage in the case of performing the power-off process after the bright screen display and the case of performing the power-off process after displaying the black screen after the power-off signal is generated.

15, after a power-off signal is generated, for example, by supplying a data voltage Vdata equal to or greater than the threshold voltage value Va, a special screen display time Tsd corresponding to a bright screen (bright image) The driving voltage EVDD applied to the organic light emitting display panel 110 can be quickly lowered to the base value EVDD_0 because the driving voltage discharge path can be formed. That is, a fast discharge can be performed.

However, if a special screen corresponding to a black screen (black image) less than the threshold luminance value is displayed by supplying the black data voltage Vdata_Black after the power-off signal is generated, for example, a drive voltage discharge path can not be created Therefore, the driving voltage EVDD applied to the organic light emitting display panel 110 is not quickly lowered to the base value EVDD_0. That is, a slow discharge can be performed.

Referring to FIG. 15, when a special screen is displayed for a time longer than the special screen display time Tsd corresponding to a bright screen (bright image) which is equal to or more than the threshold luminance value after the power-off signal is generated, The time Tvd required for quickly lowering the driving voltage EVDD to the base value EVDD_0 is lower than the critical luminance value after generation of the power OFF signal due to the formation of the driving voltage discharge path Is much shorter than the time (Tvd ') required for the driving voltage (EVDD) applied to the organic light emitting display panel 110 to rapidly fall to the base value (EVDD_0) when the corresponding special screen is displayed.

Fig. 16 is a diagram showing the timing of the next power-on processing in the case where the power-off processing is performed after the bright screen display and the case where the power-off processing is performed after the black screen display after the power-off signal is generated.

It is assumed that a power-on signal (Power On Signal) is input directly after the power-off signal is generated.

Referring to FIG. 16, when a special screen corresponding to a black screen (black image) less than the critical luminance value is displayed for the afterimage improvement, since a slow discharge is performed, the driving voltage (EVDD) is not completely lowered to the base value (EVDD_0).

Therefore, for the power-on processing and the normal display driving after a power-on signal has occurred, a certain time (on-time delay) is required until the drive voltage EVDD is completely lowered to the base value EVDD_0, You have to wait for a while.

By this on-time delay, the power-on process can not proceed immediately, and the normal display drive is delayed so much that the user can not see the screen (normal display screen) long after the user presses the power button of the remote controller, Can be seen. Thus, user satisfaction with product quality can be greatly reduced.

On the other hand, according to the embodiments, when a special screen is displayed for more than a special screen display time Tsd corresponding to a bright screen (bright image) whose threshold luminance value or more is generated after the power-off signal is generated, Since the drive voltage EVDD applied to the sustain electrode driver 110 is quickly lowered to the base value EVDD_0, the power-on process can be performed without a large delay and the normal display drive can be promptly advanced.

Accordingly, the user can directly see the screen (normal display screen) after pressing the power button of the remote controller or the like to watch the TV again.

In the OLED display 100 according to the present embodiment, as the driving time of each sub-pixel SP becomes longer, the circuit elements such as the organic light emitting diode OLED and the driving transistor DRT are deteriorated Degradation.

Accordingly, inherent characteristic values (e.g., threshold voltage, mobility, etc.) of the circuit elements such as the organic light emitting diode OLED and the driving transistor DRT can be changed.

The degree of change in the characteristic value between the circuit elements may be different due to the difference in degree of deterioration between the circuit elements.

Due to variations and deviations in characteristic values of such circuit elements, a luminance deviation may occur between the sub-pixels SP. Accordingly, the luminance uniformity of the organic light emitting display panel 110 is deteriorated and the image quality may be deteriorated.

Accordingly, the organic light emitting diode display 100 according to the present embodiment has a "pixel compensation function" for compensating a characteristic value of a circuit element (a driving transistor or an organic light emitting diode) in a sub-pixel and a " "Can be provided.

In the organic light emitting diode display 100 according to the present embodiments, each subpixel SP may have a structure that enables sensing and compensation of subpixel characteristic values.

In addition, the OLED display 100 according to the exemplary embodiments of the present invention includes a sensing configuration for sensing a sub-pixel characteristic value to provide a sub-pixel compensation function, a sensing configuration for sensing a characteristic value deviation between sub- To compensate for < / RTI >

Here, the subpixel characteristic value may include, for example, a characteristic value such as a threshold voltage of the organic light emitting diode OLED, a threshold voltage of the driving transistor DRT, a characteristic value such as mobility, and the like. In the following, the threshold voltage and the mobility of the driving transistor DRT are exemplified as the sub-pixel characteristic values.

17 is another example of each subpixel structure for the organic light emitting diode display 100 according to the present embodiments to provide a subpixel compensation and sensing function.

17, each subpixel of the organic light emitting diode display 100 according to the present embodiment includes, in addition to the organic light emitting diode OLED, the driving transistor DRT, the switching transistor SWT, and the storage capacitor Cst, , And a sensing transistor (SENT: Sensing Transistor).

17, the sensing transistor SENT is connected between a first node N1 of the driving transistor DRT and a reference voltage line RVL for supplying a reference voltage Vref, It can be controlled by receiving a kind of sensing signal SENSE.

The sensing transistor SENT is turned on by the sensing signal SENSE to apply a reference voltage Vref supplied through the reference voltage line RVL to the first node N1 of the driving transistor DRT.

Also, the sensing transistor SENT may serve as a sensing path for sensing the voltage of the first node N1 of the driving transistor DRT.

The scan signal SCAN and the sense signal SENSE may be respectively applied to the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT through another gate line.

In some cases, the scan signal SCAN and the sense signal SENSE may be the same signal and may be respectively applied to the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT through the same gate line.

18 is a diagram illustrating a subpixel compensation circuit of the OLED display 100 according to the present embodiments.

18, the OLED display 100 according to the present embodiment includes a sensing unit 1810 for sensing a sub-pixel characteristic value, a memory 1820 for storing a sensing result of the sensing unit 1810, And a compensation unit 1830 for compensating the sub-pixel characteristic value deviation.

Here, as an example, the sensing unit 1810 may be included in the source driver integrated circuit and may be implemented as an analog to digital converter (ADC), and the compensation unit 1830 may be included in the controller 140 .

The organic light emitting diode display 100 according to the present exemplary embodiment is configured to control the driving of the driving transistor DRT within the subpixel SP by controlling the voltage application state of the first node N1 in the subpixel SP, And may further include a first switch SW1 and a second switch SW2 in order to control a state required for sensing.

Through the first switch SW1, the reference voltage line RVL may be connected to the supply node of the reference voltage Vref.

When the first switch SW1 is turned on and the reference voltage line RVL and the supply node of the reference voltage Vref are connected to each other, the reference voltage Vref is applied to the driving transistor S11 through the sensing transistor SENT, Is applied to the first node (N1) of the driving transistor (DRT).

On the other hand, when the voltage of the first node N1 of the driving transistor DRT becomes the voltage state reflecting the sub-pixel characteristic value, that is, when the voltage of the reference voltage line RVL becomes the voltage state reflecting the sub- The second switch SW2 is turned on, and the sensing unit 1810 is connected to the reference voltage line RVL.

Accordingly, the sensing unit 1810 senses the voltage of the reference voltage line RVL, that is, the voltage of the first node N1 of the driving transistor DRT, which is a voltage state reflecting the subpixel characteristic value. Here, the reference voltage line RVL is also referred to as a sensing line.

The reference voltage lines RVL may be arranged, for example, one for each sub-pixel column, or one for each of two or more sub-pixel columns.

For example, if one pixel is composed of four subpixels (red subpixel, white subpixel, green subpixel, and blue subpixel), one pixel may be arranged for each one pixel column.

Each sub-pixel may be driven for threshold voltage sensing of the driving transistor DRT and for driving the driving transistor DRT.

The sensing value sensed by the sensing unit 1810 may be a sensing value for sensing the threshold voltage Vth of the driving transistor DRT or a sensing value for sensing the mobility of the driving transistor DRT. have.

For example, when the subpixel is driven for the threshold voltage sensing of the driving transistor DRT, the first node N1 and the second node N2 of the driving transistor DRT The first node N1 of the driving transistor DRT is floated and the first node N1 of the driving transistor DRT is initialized to the threshold voltage sensing driving data voltage Vdata and the reference voltage Vref, The voltage of the first node N1 of the driving transistor DRT becomes saturated.

The saturated voltage of the first node N1 of the driving transistor DRT corresponds to the difference between the data voltage Vdata and the threshold voltage Vth.

Accordingly, the voltage sensed by the sensing unit 1810 corresponds to a voltage obtained by subtracting the threshold voltage (Vth) of the driving transistor (DRT) from the data voltage (Vdata).

When the subpixel is driven for sensing the mobility of the driving transistor DRT, the first node N1 and the second node N2 of the driving transistor DRT are driven by the mobility sensing The driving data voltage Vdata and the reference voltage Vref are initialized and the first node N1 and the second node N2 of the driving transistor DRT are both floated to raise the voltage.

At this time, the voltage rising rate (the amount of change in the voltage rising value with respect to time) indicates the current capability, i.e., mobility, of the driving transistor DRT. Therefore, the voltage of the first node N1 of the driving transistor DRT increases more sharply as the driving transistor DRT having a larger current capability (mobility) is.

The sensing unit 1810 senses the voltage of the reference voltage line RVL in which the voltage of the first node N1 of the driving transistor DRT rises together with the voltage of the first node N1 after a predetermined time has elapsed.

The sensing unit 1810 converts the sensed voltage to an analog value for sensing the threshold voltage or the mobility to generate sensing data and stores the sensed data in the memory 1820. Here, the sensing unit 1810 may be included in the source driver integrated circuit 121 of the data driver 120. The memory 1820 may be located within the controller 140 or on the control printed circuit board 170.

The compensating unit 1830 can perform characteristic value compensation processing by grasping a characteristic value (e.g., threshold voltage, mobility) of the driving transistor DRT in the corresponding subpixel based on the sensing data stored in the memory 1820. [

Here, the characteristic value compensation process may include a threshold voltage compensation process for compensating the threshold voltage of the driving transistor DRT and a mobility compensation process for compensating the mobility of the driving transistor DRT.

The threshold voltage compensation process may include a process of calculating a compensation value for compensating the threshold voltage, storing the calculated compensation value in the memory 1820, or changing the corresponding video data Data with the calculated compensation value .

The mobility compensation process may include a process of calculating a compensation value for compensating the mobility, storing the calculated compensation value in the memory 1820, or changing the corresponding image data Data with the calculated compensation value .

The compensation unit 1830 may change the image data Data through the threshold voltage compensation process or the mobility compensation process and supply the changed data to the source driver integrated circuit 121 in the data driver 120. [ Here, the compensation unit 1830 may be included inside or outside the controller 140.

Accordingly, the data driver 120 converts the changed data into a data voltage and supplies the data voltage to the corresponding sub-pixel, so that characteristic value compensation (threshold voltage compensation, mobility compensation) is actually applied.

The compensation unit 1830 compensates the characteristic value of the driving transistor to reduce or prevent the luminance deviation between the subpixels.

On the other hand, after the power-off signal is generated, the sensing process may be performed to sense the characteristic values of all the subpixels or some subpixels disposed in the organic light emitting display panel 110.

Hereinafter, a method of processing the above-described special display driving and sensing driving after generating a power-off signal when the OLED display 100 according to the present embodiment has a sensing function for subpixel compensation will be described .

19 is a flowchart illustrating a method of driving the OLED display 100 when the OLED display 100 according to the present embodiment has a sensing function for subpixel compensation.

Referring to FIG. 19, in the method of driving the organic light emitting display 100 according to the present invention, after the step S310 of detecting the generation of the power off signal, (S1900) of determining whether to display the special screen based on the continuous driving time when the apparatus 100 is continuously turned on.

That is, the controller 140 can output the data for displaying the special screen to the data driver 120 based on the continuous driving time in which the organic light emitting display 100 is continuously turned on.

The step S1900 may include analyzing the on-time information of the organic light emitting display 100 (S1910), and determining whether the continuous driving time in which the organic light emitting display 100 is continuously turned on (S1920) of determining whether to display the special screen in accordance with the determination result.

Here, the on-time information of the organic light emitting display 100 may be information managed by the controller 140 or information managed by the power management unit 190.

In step S1920, the controller 140 determines whether or not the organic light emitting display 100 continuously displays the on-time information on the basis of the on-time information of the analyzed organic light emitting display 100 When the continuous driving time in which the organic light emitting display 100 is continuously turned on is less than the predetermined critical continuous driving time before the power OFF signal is generated, It can be determined to display a special screen.

In this manner, when the continuous driving time is less than the critical continuous driving time, the controller 140 determines to display the special screen on the organic light emitting display panel 110, and transmits data for displaying the special screen to the data driver 120 .

Accordingly, the special display is driven in the organic light emitting display panel 110 to display a special screen (S320).

On the other hand, when the continuous driving time is equal to or longer than the critical continuous driving time, the controller 140 determines that the panel sensing driving and processing should proceed and transmits data different from the data for displaying the special screen to the data driver 120 Output.

Accordingly, the organic light emitting display panel 110 performs panel sensing driving and processing (S1930).

In operation S1910, the controller 140 analyzes the on-time information of the OLED display 100 according to the power-off signal.

Based on the analyzed on-time information, the controller 140 determines whether the continuous driving time is less than the critical continuous driving time (S1920). If the continuous driving time is less than the critical continuous driving time as a result of the determination, It is determined that the sensing process condition for the special screen 110 is not satisfied, that is, it is determined that the special screen should be displayed, and data for displaying the special screen is output to the data driver 120. [

On the other hand, when the continuous driving time is equal to or longer than the critical continuous driving time, the controller 140 does not display the special screen on the organic light emitting display panel 110, It is possible to output to the data driver 120 data different from data for display of the special screen.

As described above, when the continuous driving time before the power-off signal generation is less than the critical continuous driving time, it is considered that the sub-pixel characteristic value in the organic light emitting display panel 110 does not change significantly or meaningfully, There is no need to do this.

Therefore, in this case, a special screen is displayed on the organic light emitting display panel 110 instead of the panel sensing drive and processing.

On the other hand, after step S1930 in which the panel sensing driving and processing is performed, a step S320 of displaying a special screen or a step S330 of processing an off-sequence may be performed.

According to the above description, it is possible to prevent or reduce the afterimage phenomenon occurring after the power-off process even when the organic light emitting display device 100 has the sensing and compensation function, - It can effectively apply special display driving which can greatly reduce the possibility of time delay phenomenon.

On the other hand, in step S1930 in which the panel sensing drive and processing are performed, the data driver 120, at a certain point in time, as shown in FIG. 20, ..., Vdata n-3) to some of the data lines DL1, ..., DLn-3 connected to the sub-pixels SP1, ..., SPn- The remaining data lines DL2, DL3, DL4, ... connected to the other sub-pixels SP2, SP3, SP4, ..., SPn-2, SPn- Vdata 2, Vdata 3, Vdata 4, ..., Vdata n-2, Vdata n-1, DLn-2, 1, Vdata n).

For reference, FIG. 20 shows a case where one reference voltage line (RVL) corresponding to the sensing line is arranged for every four subpixel rows.

According to the embodiments of the present invention described above, the controller 140, the organic light emitting display panel 140, and the organic light emitting display panel 140 can prevent or reduce a visible image after the power off signal is generated, 110, an OLED display 100, and a driving method thereof.

According to the embodiments of the present invention, the controller 140, the organic light emitting display panel 110, the organic light emitting display panel 110, and the organic light emitting display panel can be directly displayed without a large delay even after the power- The display apparatus 100 and the driving method thereof can be provided.

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 present invention as defined by the appended claims. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. 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.

100: organic light emitting display
110: organic light emitting display panel
120: Data driver
130: gate driver
140: controller

Claims (19)

A plurality of data lines and a plurality of gate lines are arranged and a plurality of subpixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode are disposed, An organic light emitting display panel for displaying a special screen having a predetermined threshold luminance value or more for a predetermined period of time or more; And
And a data driver for outputting a data voltage for displaying the special screen. The method according to claim 1,
The special screen having the threshold luminance value or more,
Wherein the luminance of all the subpixels in the organic light emitting display panel is a screen having a luminance value equal to or greater than the individual threshold luminance value. The method according to claim 1,
The special screen having the threshold luminance value or more,
Wherein the luminance of the subpixels equal to or greater than a predetermined ratio among all the subpixels in the organic light emitting display panel is a screen having an individual threshold luminance value or more. The method according to claim 1,
The special screen having the threshold luminance value or more,
Wherein a luminance of an outer region of a specific image region in the organic light emitting display panel is a screen having an individual threshold luminance value or more. The method according to claim 1,
The special screen having the threshold luminance value or more,
Wherein the image displayed before the power-off signal is displayed equally is a screen having a luminance higher than the threshold luminance value before the power-off signal is generated. The method according to claim 1,
Further comprising a controller for sensing generation of the power-off signal and outputting data for displaying the special screen to the data driver. The method according to claim 6,
The controller comprising:
And when the generation of the power-off signal is detected, data for displaying the special screen is output to the data driver based on the continuous driving time during which the OLED display is continuously turned on before the power-off signal is generated Organic light emitting display. 8. The method of claim 7,
The controller comprising:
Outputting data for display of the special screen to the data driver when the continuous driving time is less than a predetermined critical continuous driving time,
And outputs data different from data for display of the special screen to the data driver when the continuous driving time is equal to or longer than the critical continuous driving time. 9. The method of claim 8,
The controller comprising:
And outputting data for displaying the special screen to the data driver when it is determined that the sensing processing condition for the organic light emitting display panel is unsatisfied if the continuous driving time is less than the critical continuous driving time,
And determines that the sensing processing condition for the organic light emitting display panel is satisfied and outputs the other data to the data driver when the continuous driving time is equal to or greater than the critical continuous driving time. The method according to claim 1,
And a power management unit for performing a power-off process for a driving voltage applied to the organic light emitting display panel after the special screen is displayed for a time longer than the special screen display time in the organic light emitting display panel. 11. The method of claim 10,
The power management unit,
And performs a power-off process on a logic voltage used in the controller after performing a power-off process on the driving voltage. The method according to claim 1,
The voltage of the driving voltage supply node to the organic light emitting display panel is lowered to a predetermined base value after a lapse of a predetermined time after the special screen is displayed. A plurality of data lines carrying data voltages; And
A plurality of subpixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode,
The plurality of subpixels,
And after the occurrence of the power-off signal, has a luminance equal to or greater than a predetermined threshold luminance value. An organic light emitting diode (OLED) display panel including a plurality of subpixels, each of the subpixels including an organic light emitting diode and a driving transistor for driving the organic light emitting diode; And
And a data driver for outputting a data voltage equal to or greater than a predetermined threshold voltage value to at least one data line after the generation of the power-off signal. A driving method of an organic light emitting display device,
Sensing an occurrence of a power-off signal;
The organic light emitting display panel displaying a special screen having a predetermined threshold luminance value or more for a predetermined special screen display time or longer; And
And processing a predetermined off sequence (Off Sequence). 16. The method of claim 15,
Wherein processing the off-
And performing a power-off process on a driving voltage (EVDD) applied to the OLED display panel. 16. The method of claim 15,
After the sensing step,
Further comprising the step of determining whether to display the special screen based on a continuous driving time during which the organic light emitting display is continuously turned on before the power off signal is generated. 18. The method of claim 17,
Wherein the determining comprises:
Analyzing on-time information of the OLED display; And
Determining whether the continuous driving time in which the OLED display is continuously turned on is less than the critical continuous driving time before the power-off signal is generated, and determining to display the special screen Driving method. A sensing unit for sensing generation of a power-off signal;
A control unit for controlling the display unit to display a special screen having a predetermined threshold luminance value or more for a time longer than a predetermined special screen display time when the generation of the power off signal is detected; And
And a data output unit for outputting data for display of the special screen.

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