KR102277680B1 - 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

In the present embodiments, after the power-off signal is generated, a special screen equal to or greater than a predetermined threshold luminance value is displayed on the organic light emitting display panel for a predetermined special screen display time or longer, so that the power-off process can be completed more quickly, A controller, an organic light emitting display panel, an organic light emitting display device, and the like that can prevent or reduce an afterimage phenomenon that may occur after power-off processing, and allow power-on processing and screen display to be performed quickly even when the next power-on signal is input It's about how to drive.

Description

Controller, organic light emitting display panel, organic light emitting display device and driving method thereof

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

Recently, an organic light emitting display device, which has been in the spotlight as a display device, has advantages of fast response speed, high luminous efficiency, luminance, and viewing angle by using an organic light emitting diode (OLED) that emits light by itself.

In such an organic light emitting display device, a plurality of sub-pixels including organic light emitting diodes are arranged, and the brightness of the sub-pixels selected by a scan signal is controlled according to a gray level of data.

As described above, in order for the organic light emitting display device to drive each sub-pixel, various voltages are applied to the organic light emitting display panel.

Meanwhile, after the power-off signal is generated, the organic light-emitting display device performs power-off processing on various voltages applied to the organic light-emitting display panel and logic voltages used in other electronic components (eg, timing controllers, etc.).

As described above, the conventional organic light emitting display device has a problem in that an image displayed before the power-off signal is displayed as an afterimage, despite the power-off process being performed according to the generation of the power-off signal. .

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

An object of the present embodiments is to provide a controller, an organic light emitting display panel, an organic light emitting display device, and a driving method capable of preventing or reducing the phenomenon that an image displayed before the power off signal is generated after the power off signal is generated as an afterimage. is to provide

In addition, another object of the present embodiments is to provide a controller, an organic light emitting display panel, an organic light emitting display device, and a driving method that allow a screen to be displayed immediately without a large delay even when a power on signal is generated immediately after a power off signal is generated. to provide a way.

According to an embodiment, an organic light emitting display panel in which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels each including an organic light emitting diode and a driving transistor driving the organic light emitting diode are disposed, and a plurality of data An organic light emitting diode display including a data driver driving a line may be provided.

The organic light emitting display panel of the organic light emitting display device may display a special screen, which may be a bright screen of a predetermined threshold luminance value or more, for a predetermined special screen display time or longer after the power-off signal is generated.

To this end, the data driver may output a data voltage for displaying a special screen on the organic light emitting display panel.

Such an organic light emitting display device may perform a power-off process for a driving voltage applied to the organic light emitting display panel after a special screen is displayed for more than a special screen display time on the organic light emitting display panel.

In another embodiment, a plurality of data lines transmitting a data voltage, a plurality of gate lines transmitting a gate signal, an organic light emitting diode, a driving transistor driving the organic light emitting diode, and a plurality of driving transistors each including the driving transistor An organic light emitting display panel including sub-pixels may be provided.

In such an organic light emitting display panel, sub-pixels of a predetermined ratio or more among a plurality of sub-pixels may have luminance greater than or equal to a predetermined threshold luminance value after the power-off signal is generated.

Another embodiment provides an organic light emitting display panel in which a plurality of data lines and a plurality of gate lines are disposed, 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, and power-off An organic light emitting diode display including a data driver for outputting a data voltage equal to or greater than a predetermined threshold voltage to at least one data line after generating a signal may be provided.

In another embodiment, detecting the generation of the power-off signal, and after detecting the generation of the power-off signal, the organic light emitting display panel displays a special screen equal to or greater than a predetermined threshold luminance value for a predetermined special screen display time or longer. and processing a predetermined off sequence after a special screen equal to or greater than a predetermined threshold luminance value is displayed for a predetermined special screen display time or longer on the organic light emitting display panel, and the like. can provide

In another embodiment, there is provided a detection unit for detecting generation of a power-off signal, and a control unit for controlling the display of a special screen equal to or greater than a predetermined threshold luminance value for more than a predetermined special screen display time when the generation of the power-off signal is detected; , it is possible to provide a controller including a data output unit for outputting data for display of a special screen.

According to the present embodiments as described above, a controller, an organic light emitting display panel, and an organic light emitting display capable of preventing or reducing the phenomenon that an image displayed before the power off signal is generated after the power off signal is generated as an afterimage. A device and a method of driving the same can be provided.

In addition, according to the present embodiments, even when a power-on signal is generated immediately after a power-off signal is generated, a controller, an organic light-emitting display panel, an organic light-emitting display device, and a driving method thereof that allow a screen to be displayed immediately without a large delay can provide

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It will be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

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

Referring to FIG. 1 , the organic light emitting diode display 100 according to the present embodiments includes an organic light emitting display panel 110 on which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels are disposed; It includes a data driver 120 for driving a plurality of data lines, a gate driver 130 for driving a plurality of gate lines, and a controller 140 for controlling the data driver 120 and the gate driver 130 . .

A plurality of sub-pixels may be arranged in a matrix type in the organic light emitting display panel 110 , and each sub-pixel is connected to at least one data line and at least one gate line, and in some cases, different types of voltages are supplied. may be connected to a signal line.

The data driver 120 drives the 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 according to a driving method or a panel design method, and in some cases, located on both upper and lower sides or both left and right sides. You may.

The gate driver 130 sequentially drives the plurality of gate lines by sequentially supplying 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 operation timings of the data driver 120 and the gate driver 130 , or may include a control module different from the timing controller.

The controller 140 starts scanning according to the timing implemented in each frame, converts the input image data input from the outside to match the data signal format used by the data driver 120, and outputs the converted image data. , control the data operation at an appropriate time according to the scan.

The gate driver 130 sequentially drives the plurality of gate lines by sequentially supplying an on-voltage or an off-voltage scan signal to the plurality of gate lines under the control of the controller 140 . do.

The gate driver 130 may be positioned on only one side of the organic light emitting display panel 110 as shown in FIG. 1 or on both sides in some cases, depending on a driving method or a panel design method.

Also, 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 through a tape automated bonding (TAB) method or a chip-on-glass (COG) method or is connected to a GIP (GIP) method. Gate In Panel) type and may be disposed directly on the organic light emitting display panel 110 , or may be integrated and disposed on the organic light emitting display panel 110 in some cases.

Each gate driver integrated circuit 132 may be implemented in a chip on film (COF) method. In this case, each gate driver integrated circuit 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.

When a specific gate line is opened, the data driver 120 converts image data (Data) received from the controller 140 into an analog data voltage (Vdata) and supplies it to a plurality of data lines, thereby providing a plurality of data lines. drive

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) method or is an organic light emitting diode. It may be directly disposed on the display panel 110 or, in some cases, may be integrated and disposed on the organic light emitting display panel 110 .

In addition, each source driver integrated circuit 122 may be implemented in a chip on film (COF) method. In this case, each source driver integrated circuit 122 has one end bonded to at least one source printed circuit board 160 , and the other end of the film 121 bonded to the organic light emitting display panel 110 . ) can be mounted on Here, the film 121 may be a flexible film.

Each source driver integrated circuit 122 may include a logic unit including a shift register, a latch circuit, and the like, a digital analog converter (DAC), an output buffer, and the like, and in some cases, sub-pixels. The sensor may further include a sensing unit configured to sense the characteristics of the sub-pixels in order to compensate for the characteristics (eg, the threshold voltage and mobility of the driving transistor, the threshold voltage of the organic light emitting diode, the luminance of the sub-pixel, etc.).

On the other hand, the controller 140, along with the input image data, a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input data enable (DE: Data Enable) signal, various types including a clock signal (CLK), etc. Receive timing signals from the outside (eg host system).

The controller 140 converts the input image data input from the outside to match the data signal format used by the data driver 120 and outputs the converted image data, as well as the data driver 120 and the gate driver. In order to control the 130 , the data driver 120 and the gate driver receive a timing signal such as a vertical sync signal Vsync, a horizontal sync signal Hsync, an input DE signal, and a clock signal, and generate various control signals. (130) is output.

For example, in order to control the gate driver 130 , the controller 140 includes a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE). Various gate control signals (GCS: Gate Control Signal) including gate output enable) are output.

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 shift timing of a scan signal (gate pulse). The gate output enable signal GOE specifies timing information of one or more gate driver integrated circuits.

In addition, the controller 140 controls the data driver 120 , a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE: Source Output). Enable) and output various data control signals (DCS: Data Control Signal).

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 that controls 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 printed circuit board 160 to which at least one source driver integrated circuit is bonded and a flexible flat cable (FFC) or flexible printed circuit (FPC). It may be disposed on a control printed circuit board 170 connected through a connection medium 180 such as a printed circuit.

In the control printed circuit board 170, a power controller for supplying various voltages or currents to the organic light emitting display panel 110, the data driver 120, the gate driver 130, or the like, or for controlling the various voltages or currents to be supplied ( 150) may be further disposed.

The above-mentioned source printed circuit board 160 and control printed circuit board 170 may be a single printed circuit board.

Meanwhile, the organic light emitting display device 100 according to the present embodiments may further include a power management unit 190 that supplies and manages all power used in the organic light emitting display device 100 .

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

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

2 is an exemplary diagram of a sub-pixel structure of the organic light emitting diode display 100 according to the present exemplary embodiment.

Referring to FIG. 2 , in the organic light emitting diode display 100 according to the present exemplary embodiments, each sub-pixel basically drives an organic light emitting diode (OLED) and an organic light emitting diode (OLED). A driving transistor (DRT) that uses a driving transistor (DRT), a switching transistor (SWT) for transferring a data voltage to the first node (N1) of the driving transistor (DRT), and a data voltage corresponding to the image signal voltage or It may be configured to include a storage capacitor (Cst: Storage Capacitor) that maintains the corresponding voltage for one frame time.

The organic light emitting diode (OLED) may include a first electrode (eg, an anode electrode), an organic layer, and a second electrode (eg, 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 a source node or a 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) that supplies the 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. 2 .

The switching transistor SWT may be connected between the data line DL and the second node N2 of the driving transistor DRT, and may be controlled by receiving the scan signal SCAN through the gate line as a gate node.

The switching transistor SWT is 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.

Meanwhile, the organic light emitting display device 100 performs a power-off process when a power-off signal is generated. In such a power-off process, individual power-off processes for various types of voltages may be performed.

In relation to the power-off process, even after the power-off process is performed, an image displayed before the power-off signal is displayed as an afterimage may occur even after the power-off process is performed. This phenomenon is referred to as "afterimage phenomenon" in the present specification.

In addition, while the power-off process is in progress, that is, when the power-off process in progress is all completed when a power-on signal is generated in a situation in which individual power-off processes for various types of voltages are not all completed After waiting until the power-off process is completed, the power-on process may be performed to start driving the image. This phenomenon is referred to as "On-Time Delay" in this specification.

Accordingly, the organic light emitting display device 100 according to the present exemplary embodiments eliminates an afterimage phenomenon occurring after the power-off process and an on-time delay phenomenon when a power-on signal is generated in a state where the power-off process is not completely completed. We can offer you ways to alleviate it.

To this end, the organic light emitting display device 100 according to the present exemplary embodiments displays a special screen equal to or greater than a predetermined threshold luminance value (threshold brightness) for a predetermined special screen display time or longer after the power-off signal is generated. It is displayed on the organic light emitting display panel 110 .

After the generation of the power-off signal, driving for displaying a special screen equal to or higher than a predetermined threshold luminance value (threshold brightness) on the organic light emitting display panel 110 for more than a predetermined special screen display time is referred to as “special display driving ( Special Display Driving).

The special screen (special image) described in this specification means a screen that a user can feel as being bright as a whole. As used herein, the term “screen” means displayed on the organic light emitting display panel 110 .

In order to display a special screen equal to or greater than a predetermined threshold luminance value on the organic light emitting display panel 110 , the data driver 120 may output a data voltage for displaying the special screen.

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

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

For example, assuming that the luminance range is 0 to 255 gray scale, the threshold luminance value may be 125 gray scale. Also, the predetermined ratio may be, for example, a ratio value of 50% or more.

In order to display a special screen equal to or greater than a predetermined threshold luminance value on the organic light emitting display panel 110 , the data driver 120 applies a data voltage equal to or greater than the predetermined threshold voltage value to at least one data line after the power-off signal is generated. can be output as

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

As described above, after the power-off signal is generated, a special screen greater than or equal to a threshold luminance value is displayed on the organic light emitting display panel 110 for a predetermined special screen display time or longer, thereby preventing or reducing the afterimage phenomenon occurring after the power-off process. In addition to this, the power-off process can be completed more quickly, thereby greatly reducing the possibility of on-time delay.

Hereinafter, the driving method of the organic light emitting display device 100 according to the present exemplary embodiments briefly described above will be described in more detail.

3 is a flowchart illustrating a method of driving the organic light emitting display device 100 according to the present exemplary embodiments. 4 is a graph showing changes in AC power, a driving voltage EVDD, and a logic voltage VDD according to a driving method of the organic light emitting diode display 100 according to the present exemplary embodiment.

3 and 4, in the method of driving the organic light emitting display device 100 according to the present embodiments, while displaying a normal display screen according to normal display driving, Detecting the generation of a power-off signal ( S310 ) and performing special display driving so that the organic light emitting display panel 110 exceeds a predetermined threshold luminance value for a predetermined special screen display time Tsd or longer It may include a step of displaying a special screen (a special screen or a special display screen) (S320) and a step of processing a predetermined off sequence (S330) and the like.

The power-off signal detected in step S310 may be generated when the user inputs the power button of the remote control or the organic light emitting display device 100, and the input receiving module (not shown) of the organic light emitting display device 100 detects it for the first time. do.

3 and 4 , when the input receiving module (not shown) detects generation of a power off signal, the AC power is turned off by the power management unit 190 .

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

The controller 140 may detect the generation of the power-off signal by receiving the control signal AC_DET.

In step S320 , according to the detection of the power-off signal, the controller 140 controls the organic light emitting display panel 110 to display a special screen equal to or greater than a predetermined threshold luminance value for a predetermined special screen display time Tsd or longer. data can be output to the data driver 120 .

In this case, 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 processing, and may include a plurality of individual power-off processing for various voltages.

When the driving method of the organic light emitting display device 100 according to the above-described embodiments is used, after the power-off signal is generated, a special screen (bright image) greater than or equal to a threshold luminance value for a predetermined special screen display time Tsd or longer is displayed on the organic light emitting display panel 110 to prevent or reduce an afterimage phenomenon that occurs after the power-off process, and not only this, but also enables the power-off process to be completed more quickly, resulting in an on-time delay phenomenon. It can greatly reduce the chances.

As described above, in step S330 , the organic light emitting display device 100 may perform individual power-off processing for various voltages. For example, the driving voltage EVDD applied to the organic light emitting display panel 110 . may perform power-off processing for .

In this regard, the power management unit 190 detects the special screen after the special screen display time Tsd or more is displayed on the organic light emitting display panel 110 and applies the driving voltage to the organic light emitting display panel 110 . Power-off processing for (EVDD) may be performed. 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 on the organic light emitting display panel 110 for the special screen display time Tsd, the driving voltage supply node to the organic light emitting display panel 110 (the third node N3 in FIG. 2 or electrically thereto) The voltage of the node connected to ) is lowered to a predetermined base value EVDD_0 after a predetermined time Tvd has elapsed.

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

As described above, after the power-off signal is generated, a special screen (bright image) equal to or greater than the threshold luminance value is displayed on the organic light emitting display panel 110 for a predetermined special screen display time Tsd or longer, and then the off sequence processing is performed. By doing so, various voltages used in the organic light emitting display device 100 are quickly turned off, so that no matter how quickly a power-on signal is generated, the possibility of an on-time delay phenomenon can be greatly reduced.

Referring to FIG. 4 , after the special screen is displayed for the special screen display time Tsd or longer in the organic light emitting display panel 110 , the power-off process for the driving voltage EVDD applied to the organic light emitting display panel 110 is performed. As this is performed, the driving voltage EVDD applied to the organic light emitting display panel 110 drops to the base value EVDD_0.

In this case, since a special screen (bright image) greater than the threshold luminance value is displayed on the organic light emitting display panel 110 , the driving voltage EVDD may be lowered to the base value EVDD_0 at a very high speed. That is, the lowering of the driving voltage EVDD to the base value EVDD_0 has the same meaning as that the driving voltage EVDD is turned off.

As described above, the reason why the driving voltage EVDD is turned off at a very high speed will be described with reference to FIG. 5 .

5 is a diagram illustrating a driving voltage discharge path in a sub-pixel according to a driving method of the organic light emitting display device 100 according to the present exemplary embodiment.

Referring to FIG. 5 , after a power-off signal is generated, in order to display a special screen (bright screen) greater than or equal to a predetermined threshold luminance value on the organic light emitting display panel 110 , the data driver 120 sets a predetermined threshold voltage value. When the above data voltage is output, the data voltage Vdata greater than or equal to the threshold voltage value Va is applied to the second node N2 of the driving transistor DRT.

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

Accordingly, the driving voltage EVDD is quickly lowered to be turned off.

Here, in this specification, turning off the driving voltage EVDD is also referred to as driving voltage discharge.

In this sense, the current path formed from the driving voltage supply node (N3 or its connection node) through the turned-on driving transistor DRT and the organic light emitting diode OLED to the base voltage application node to which the base voltage EVSS is applied. It is called "driving voltage discharge path".

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

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

In case 1, all sub-pixels are bright sub-pixels, and in the special screen, the entire area corresponds to a bright area.

Here, the luminance of each sub-pixel is equal to or greater than the individual threshold luminance value, and the total luminance of the special screen may be a luminance value arithmetic, which is an average of the luminance of all sub-pixels. above the individual threshold luminance values.

In case 1, an individual threshold luminance value serving as a luminance reference for each sub-pixel and a threshold luminance value serving as a luminance reference for the entire special screen may be set to the same value.

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

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

Here, the predetermined ratio R refers to a ratio of sub-pixels having a luminance equal to or greater than a predetermined individual threshold luminance value so that the special screen appears bright among all sub-pixels in the organic light emitting display panel 110 .

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

For example, when the constant ratio is 3/4, the luminance of three sub-pixels among the four sub-pixels may be greater than or equal to an individual threshold luminance value, and the luminance of one sub-pixel may be less than an individual threshold luminance value.

As such, when subpixels of a certain ratio (R) or higher among all subpixels in the organic light emitting display panel 110 have luminance greater than or equal to an individual threshold luminance value, and the remaining subpixels have luminance less than an individual threshold luminance value, Mathematically, the total luminance of the special screen may be a luminance value averaging the luminances of all sub-pixels, and the calculated total luminance of the special screen must be equal to or greater than a threshold luminance value.

Therefore, the individual threshold luminance value and a certain ratio should be set so 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 serving as a reference for the total luminance of the special screen may be the same as or different from the threshold luminance value serving as a reference for the total luminance of the special screen in Case 1 .

As described above, when a special screen is displayed so that the luminance of the sub-pixels above a certain ratio (R) among all the sub-pixels is equal to or greater than the individual threshold luminance value and the total luminance is greater than or equal to the threshold luminance value, the luminance of all sub-pixels Compared to the case of exceeding the individual threshold luminance value, driving the special display may be somewhat complicated, but it can be controlled so that it is not displayed too brightly, so that the user does not mistake the special screen for an abnormality after the power-off signal is generated. can do it

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

Referring to FIG. 8 , in the organic light emitting display panel 110 , the sub-pixels located in the specific image area 800 on which the letter "OLED" is displayed are dark sub-pixels showing luminance less than the respective threshold luminance value, and the specific image area. The sub-pixels located in the outer region of 800 are bright sub-pixels showing luminance greater than or equal to the respective threshold luminance value.

Referring to FIG. 8 , the specific image area 800 on which the word “OLED” is displayed in the organic light emitting display panel 110 has a luminance less than the threshold luminance value so that the overall luminance of the special screen is greater than or equal to the threshold luminance value, An outer region of the specific image region 800 has a luminance greater than or equal to a 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 brightness of the specific image area 800 on which any letters, symbols, or company logos are displayed is set to be less than the threshold luminance value, and the outer area of the specific image area 800 is made to be above the threshold luminance value, so that the overall brightness is bright. In the case of displaying a special screen of the screen, the driving for this (special display driving) may be somewhat complicated, but after the power-off signal is generated, a bright screen (special screen) that may feel unnecessary to the user is the power-off processing procedure It makes it possible to feel that the screen is normally displayed on the screen, and can prevent it from being mistaken for an abnormal screen phenomenon.

Referring to FIG. 8 , while a normal display screen is being displayed, the threshold luminance displayed on the organic light emitting display panel 110 through special display driving according to generation of a power-off signal The special screen greater than or equal to the value may be a screen in which the image displayed before the generation of the power-off signal is displayed in the same manner, but the luminance is higher than the threshold luminance value before the generation of the power-off signal (Case 4).

As described above, after the power-off signal is generated, the screen displayed before the power-off signal is maintained as it is, but only the luminance is displayed brightly above the threshold luminance value to realize a special screen, thereby driving ( Driving a special display) is convenient and easy, and it has the advantage of preventing the user from feeling the difference between the screens before and after the power-off signal is generated.

Meanwhile, a special screen display process after the power-off signal is generated may be controlled by the controller 140 .

The controller 140 may detect the generation of the power-off signal for special screen display processing after the generation of the power-off signal, and output data for displaying the corresponding special screen to the data driver 120 .

By using such a controller 140, after the power-off signal is generated, a special screen that is brighter than the threshold luminance value is displayed for a predetermined special screen display time, thereby preventing or reducing the afterimage phenomenon occurring after the power-off process. In addition, the possibility of on-time delay can be greatly reduced by allowing the power-off process to be completed more quickly.

Hereinafter, the controller 140 will be described in more detail.

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

Referring to FIG. 10 , the controller 140 for providing the method of driving the organic light emitting display device 100 according to the present exemplary embodiments includes a data input unit 1010 that receives input data from an external host system 1000 . and a memory 1020 for storing input data, a detection unit 1030 for detecting generation of a power-off signal, and a predetermined time for a predetermined special screen display time Tsd or longer when generation of a power-off signal is detected. The controller 1040 may include a control unit 1040 that controls the display of a special screen equal to or greater than a threshold luminance value, and a data output unit 1050 that outputs data for displaying the special screen according to the controller 1040 .

The controller 1040 determines the types of special screens (Case 1, Case 2, Case 3, and Case 4) to newly generate data for displaying the determined types of special screens (Case 1, Case 2, and Case 3). , data for displaying a special screen can be created by changing the previously output data (Case4).

The controller 1040 may transfer data generated for displaying a special screen to the data output unit 1050 or may store the data in the memory 1020 .

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

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

In this case, the power management unit 190 may perform a power-off process.

The power management unit 190 counts a predetermined time (eg, Tsd) from the time the power-off signal is generated using a separate timer without receiving the special screen display end signal from the controller 140 , so that the special screen is displayed during the special screen display time. The power-off process may be performed according to a predetermined timing by finding out what is displayed during the time by itself.

As described above, it is possible to prevent or reduce an afterimage phenomenon that occurs after the power-off process, and, as well as to allow the power-off process to be completed more quickly, greatly reducing the possibility of an on-time delay phenomenon. A embodied controller 140 may be provided.

11 is a diagram illustrating a data driver 120 for providing a method of driving the organic light emitting diode display 100 according to the present exemplary embodiments.

Referring to FIG. 11 , after the power-off signal is generated, the data driver 120 generates at least one data voltage equal to or higher than a predetermined threshold voltage so that a special screen equal to or higher than a threshold luminance value is displayed on the organic light emitting display panel 110 . It can be output as a data line.

Here, the threshold voltage value may be a data voltage value corresponding to an individual threshold luminance value of a corresponding sub-pixel.

The number of data lines to which data voltages greater than or equal to the threshold voltage are output by the data driver 120 may vary according to 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 may output a data voltage equal to or greater than a threshold voltage to all data lines.

For example, when the special screen is Casde 2, the data driver 120 outputs a data voltage greater than or equal to the threshold voltage to some data lines among all data lines, and a data voltage less than the threshold voltage to the remaining data lines. can be printed out.

Referring to FIG. 11 , when the data driver 120 supplies a corresponding data voltage to each of the sub-pixels SP1 , SP2 , ... SPn arranged in an arbitrary i-th row Row, all data lines ( Data voltage (Vdata 1, Vdata 1, DL1, DL2, DL3, DL4, ... Vdata 2, Vdata 4, ... , Vdata n) are output, and data voltages Vdata 3, ... less than the threshold voltage value Va are output to the remaining data lines DL3, ... , DLn-1. , Vdata n-1) can be output.

12 is a diagram illustrating an afterimage generation phenomenon when the driving method of the organic light emitting display device 100 according to the present exemplary embodiments is not applied.

Referring to FIG. 12 , when a power off signal is generated while displaying a normal display screen according to driving of a normal display, the organic light emitting display device 100 performs a power-off process. In such a power-off process, individual power-off processes for various types of voltages may be performed.

In relation to the power-off process, even after the power-off process is completed, an "afterimage phenomenon" in which an image displayed before the power-off signal is generated as an afterimage may occur.

The afterimage 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. 5 .

13 is a diagram illustrating an afterimage improvement effect when a power-off process is performed after a power-off signal is generated, a bright screen is displayed, and a power-off process is performed.

Referring to FIG. 13 , in the organic light emitting display device 100 according to the present exemplary embodiments, when a power-off signal is generated while displaying a normal display screen according to driving of a normal display, a special display is driven. By displaying a special screen that is brighter than a predetermined threshold luminance value for a predetermined special screen time, the driving voltage EVDD applied to the organic light emitting display panel 110 is turned off more quickly, thereby eliminating or alleviating the afterimage phenomenon.

14 is a diagram illustrating an afterimage improvement effect when a power-off process is performed after a black screen is displayed after a power-off signal is generated.

Referring to FIG. 14 , after the power-off signal is generated, a special screen corresponding to a black screen (black image) less than the threshold luminance value is displayed instead of displaying a special screen corresponding to a bright screen (bright image) higher than the threshold luminance value. By doing so, the afterimage phenomenon may be removed or alleviated.

15 is a diagram illustrating a graph showing changes in main voltages in a case in which a power-off process is performed after a bright screen is displayed and a power-off process is performed after a black screen is displayed after a power-off signal is generated.

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

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

Referring to FIG. 15 , after the power-off signal is generated, when a special screen is displayed for a special screen display time Tsd or longer corresponding to a bright screen (bright image) equal to or greater than a threshold luminance value, the organic light emitting display panel 110 is applied. The time Tvd for the current driving voltage EVDD to rapidly lower to the base value EVDD_0 is the black screen (black image) below the threshold luminance value after the power-off signal is generated due to the formation of the driving voltage discharge path. When a corresponding special screen is displayed, the time taken for the driving voltage EVDD being applied to the organic light emitting display panel 110 to rapidly lower to the base value EVDD_0 is much shorter than the time Tvd'.

FIG. 16 is a diagram illustrating the timing of the next power-on process in a case where a power-off process is performed after displaying a bright screen and a power-off process is performed after a black screen is displayed after a power-off signal is generated.

It is assumed that the power-on signal is inputted immediately at the Ton point after the power-off signal is generated.

Referring to FIG. 16 , when a special screen corresponding to a black screen (black image) less than a threshold luminance value is displayed for afterimage improvement, slow discharge occurs, so that the driving voltage is generated at the time point (Ton) at which the power-on signal is generated. (EVDD) does not completely lower to the base value (EVDD_0).

For this reason, after the power-on signal is generated, for power-on processing and normal display driving, a predetermined time (on-time delay) until the driving voltage EVDD is completely lowered to the base value EVDD_0 have to wait while

Due to this on-time delay, the power-on process is not immediately proceeded, and the normal display operation proceeds that much later. Even though the user wants to watch TV again and presses the power button on the remote control, the screen is displayed only after a while (normal display screen) can be seen Accordingly, user satisfaction with respect to product quality may be greatly reduced.

In contrast, according to the present embodiments, when a special screen is displayed for more than the special screen display time Tsd corresponding to a bright screen (bright image) equal to or greater than the threshold luminance value after the power-off signal is generated, the organic light emitting display panel Since the driving voltage EVDD being applied to 110 is rapidly lowered to the base value EVDD_0, the normal display driving can be quickly performed by performing the power-on process without a significant delay.

Accordingly, the user can view the screen (normal display screen) immediately after pressing the power button of the remote control or the like to watch the TV again.

On the other hand, in the organic light emitting diode display 100 according to the present exemplary embodiments, circuit elements such as the organic light emitting diode (OLED) and the driving transistor (DRT) deteriorate ( Degradation) can be

Accordingly, unique characteristic values (eg, threshold voltage, mobility, etc.) of circuit elements such as organic light emitting diodes (OLEDs) and driving transistors (DRTs) may change.

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

Due to the change and deviation of the characteristic value of the circuit element, a luminance deviation between the respective sub-pixels SP may occur. Accordingly, the luminance uniformity of the organic light emitting display panel 110 may be deteriorated, and thus image quality may be deteriorated.

Accordingly, the organic light emitting diode display 100 according to the present exemplary embodiments includes a "subpixel compensation function" for compensating for characteristic values of circuit elements (driving transistors, organic light emitting diodes) in a subpixel and a "sensing function" for the same. " can be provided.

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

In addition, in order to provide a sub-pixel compensation function, the organic light emitting display device 100 according to the present exemplary embodiments includes a sensing configuration for sensing sub-pixel characteristic values and a characteristic deviation between sub-pixels using a sensing result of the sensing configuration. It may include a compensation configuration for compensating for .

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), characteristic values such as mobility, and the like. Below, the threshold voltage and mobility of the driving transistor DRT are exemplified as sub-pixel characteristic values.

17 is another exemplary diagram of each sub-pixel structure for providing sub-pixel compensation and sensing functions in the organic light emitting diode display 100 according to the present exemplary embodiments.

Referring to FIG. 17 , each subpixel of the organic light emitting diode display 100 according to the present exemplary embodiments includes an organic light emitting diode (OLED), a driving transistor (DRT), a switching transistor (SWT), and a storage capacitor (Cst). , a sensing transistor (SENT) may be further included.

Referring to FIG. 17 , the sensing transistor SENT is connected between the first node N1 of the driving transistor DRT and the reference voltage line RVL supplying the reference voltage Vref, and is a gate node of the scan signal. 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 the 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 to sense the voltage of the first node N1 of the driving transistor DRT.

Meanwhile, the scan signal SCAN and the sensing 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 other gate lines.

In some cases, as the same signal, the scan signal SCAN and the sensing 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 the same gate line.

18 is a diagram illustrating a sub-pixel compensation circuit of the organic light emitting diode display 100 according to the present exemplary embodiment.

Referring to FIG. 18 , the organic light emitting diode display 100 according to the present exemplary embodiments includes a sensing unit 1810 to sense sub-pixel characteristic values, a memory 1820 storing a sensing result of the sensing unit 1810, and , a compensating unit 1830 for compensating for deviation of sub-pixel characteristic values may be included.

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

In the organic light emitting diode display 100 according to the present exemplary embodiments, in order to control sensing driving, that is, the voltage application state of the first node N1 of the driving transistor DRT in the subpixel SP is determined as a subpixel characteristic value. In order to control the state required for sensing, a first switch SW1 and a second switch SW2 may be further included.

Through the first switch SW1 , the reference voltage line RVL may be connected to a 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, the reference voltage Vref is transferred to the driving transistor through the turned-on sensing transistor SENT. (DRT) is applied to the first node (N1).

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

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

As an example, one reference voltage line RVL may be disposed in each subpixel column, or may be disposed one in every two or more subpixel columns.

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

Each subpixel may be driven to sense the threshold voltage of the driving transistor DRT or may be driven to sense the mobility of the driving transistor DRT.

Accordingly, 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 sub-pixel is driven to sense the threshold voltage of the driving transistor DRT, the first node N1 and the second node N2 of the driving transistor DRT, respectively, according to the threshold voltage sensing driving is initialized to the threshold voltage sensing driving data voltage Vdata and the reference voltage Vref, and thereafter, the first node N1 of the driving transistor DRT is floated and the first node N1 of the driving transistor DRT ) rises, and after a certain period of time, the voltage of the first node N1 of the driving transistor DRT is 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 to sense the mobility of the driving transistor DRT, each of the first node N1 and the second node N2 of the driving transistor DRT senses the mobility according to the mobility sensing driving. It is initialized to the driving data voltage Vdata and the reference voltage Vref, and then, both the first node N1 and the second node N2 of the driving transistor DRT float to increase the voltage.

At this time, the voltage rising rate (the amount of change in the voltage rising value with respect to time) represents the current capability of the driving transistor DRT, that is, the mobility. Accordingly, as the driving transistor DRT has a larger current capability (mobility), the voltage at the first node N1 of the driving transistor DRT rises more steeply.

After a predetermined time has elapsed, the sensing unit 1810 senses the voltage of the reference voltage line RVL in which the voltage rises in accordance with the rise in the voltage of the first node N1 of the driving transistor DRT.

The sensing unit 1810 converts a voltage sensed for threshold voltage or mobility sensing into an analog value, generates sensing data, and stores it 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 inside the controller 140 or on the control printed circuit board 170 .

The compensator 1830 may perform a characteristic value compensation process by identifying the characteristic values (eg, threshold voltage and mobility) of the driving transistor DRT in the corresponding sub-pixel 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 for the threshold voltage of the driving transistor DRT and a mobility compensation process for compensating for the mobility of the driving transistor DRT.

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

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

The compensator 1830 may change the image data through a threshold voltage compensation process or a mobility compensation process and supply the changed data to the source driver integrated circuit 121 in the data driver 120 . Here, the compensator 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 it to the corresponding sub-pixel, so that the characteristic value compensation (threshold voltage compensation, mobility compensation) is actually applied.

Through the above-described compensation unit 1830, the characteristic value of the driving transistor may be compensated to reduce or prevent a luminance deviation between sub-pixels.

Meanwhile, after the power-off signal is generated, a sensing process for sensing characteristic values of all or some of the sub-pixels disposed on the organic light emitting display panel 110 may be performed.

Hereinafter, when the organic light emitting diode display 100 according to the present embodiments has a sensing function for sub-pixel compensation, a method of processing the above-described special display driving and sensing driving after a power-off signal is generated will be described. .

19 is a flowchart illustrating a method of driving the organic light emitting display device 100 when the organic light emitting display device 100 has a sensing function for sub-pixel compensation according to the present exemplary embodiments.

Referring to FIG. 19 , in the method of driving the organic light emitting display device 100 according to the present exemplary embodiments, after step S310 of detecting generation of a power off signal, the controller 140 performs the organic light emitting display before generation of the power off signal. The method may further include determining whether to display a special screen based on the continuous driving time in which the device 100 is continuously turned on ( S1900 ).

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

The above-described step S1900 includes the step of analyzing the on-time information of the organic light emitting diode display 100 ( S1910 ) and the continuous driving time during which the organic light emitting display device 100 is continuously turned on before the power-off signal is generated. It may be determined whether it is less than the threshold continuous driving time, and based on the determination result, determining to display a special screen (S1920).

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

In step S1920 , the controller 140 continuously activates the organic light emitting diode display 100 before the power off signal is generated based on the analyzed on-time information of the organic light emitting display device 100 . It is determined whether the continuous driving time that is turned on is less than a predetermined threshold continuous driving time, and when the continuous driving time in which the organic light emitting display device 100 is continuously turned on before the generation of the power-off signal is less than the predetermined critical continuous driving time, You can decide to display a special screen.

As such, 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 . output as

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

On the other hand, when the continuous driving time is equal to or greater than the threshold continuous driving time, the controller 140 determines that the panel sensing driving and processing should be performed, and transmits data different from the data for displaying the special screen to the data driver 120 . print out

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

In other words, the controller 140 analyzes the on-time information of the organic light emitting display device 100 according to the generation of the power-off signal ( S1910 ).

The controller 140 determines whether the continuous driving time is less than the critical continuous driving time based on the analyzed on-time information (S1920). As a result of the determination, when the continuous driving time is less than the critical continuous driving time, the organic light emitting display panel It is determined that the sensing processing condition for 110 is not satisfied, that is, it is determined that a special screen should be displayed, and data for displaying the special screen is output to the data driver 120 .

On the other hand, the controller 140 does not display a special screen on the organic light emitting display panel 110 when the continuous driving time is equal to or greater than the threshold continuous driving time based on the analyzed on-time information. It is determined that the sensing processing condition is satisfied, and data different from data for displaying a special screen may be output to the data driver 120 .

As described above, when the continuous driving time before the generation of the power-off signal is less than the critical continuous driving time, it is considered that the sub-pixel characteristic value of the organic light emitting display panel 110 does not change significantly or significantly, and sensing data is newly acquired. because you don't have to.

Accordingly, in this case, the panel sensing driving and processing are not performed, and a special screen is displayed on the organic light emitting display panel 110 instead.

Meanwhile, after step S1930 of driving and processing the panel sensing, a step of displaying a special screen (S320) or a step of processing an off sequence (S330) may be performed.

As described above, even when the organic light emitting diode display 100 has a sensing and compensation function, it is possible to prevent or reduce an afterimage phenomenon occurring after the power-off process, and to enable the power-off process to be completed more quickly. - It is possible to effectively apply special display driving that can greatly reduce the possibility of time delay.

Meanwhile, in step S1930 of driving and processing the panel sensing, the data driver 120 performs sensing target subpixels SP1, ... , among a plurality of data lines at one point in time, as shown in FIG. 20 . The data voltages Vdata 1, ... , Vdata n-3 for sensing are output to some data lines DL1, ... , DLn-3 connected to SPn-3, and the sensing target sub-pixel SP1 , ... , SPn-3) and other subpixels (SP2, SP3, SP4, ... , SPn-2, SPn-1, SPn) and the remaining data lines (DL2, DL3, DL4, .. , DLn-2, DLn-1, DLn) is a predefined data voltage for non-sensing (eg, black data voltage, Vdata 2, Vdata 3, Vdata 4, ... , Vdata n-2, Vdata n- 1, Vdata n) can be output.

For reference, in FIG. 20 , one reference voltage line RVL corresponding to a sensing line is disposed in each of four subpixel columns.

According to the present embodiments as described above, the controller 140 and the organic light emitting display panel (140) capable of preventing or reducing the phenomenon that the image displayed before the power-off signal is generated after the power-off signal is generated as an afterimage can be prevented or reduced. 110), the organic light emitting display device 100 and a driving method thereof can be provided.

In addition, according to the present exemplary embodiments, even when a power-on signal is generated immediately after a power-off signal is generated, the controller 140, the organic light emitting display panel 110, and the organic light emitting diode allow the screen to be displayed immediately without a significant delay. A display device 100 and a driving method thereof may be provided.

The above description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine the configuration within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

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

Claims (19)

In the organic light emitting display device,
A plurality of data lines and a plurality of gate lines are disposed, and a plurality of sub-pixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode are disposed, and after a power-off signal is generated, a predetermined special screen is displayed an organic light emitting display panel that displays a special screen higher than a predetermined threshold luminance value for a period of time or longer; and
and a data driver outputting a data voltage for displaying the special screen based on a driving time in which the organic light emitting display device is continuously turned on before the power-off signal is generated. According to claim 1,
The special screen above the threshold luminance value,
An organic light emitting display device, wherein the luminance of all sub-pixels in the organic light emitting display panel is a screen equal to or greater than an individual threshold luminance value. According to claim 1,
The special screen above the threshold luminance value,
The organic light emitting diode display is a screen in which luminance of sub-pixels of a certain ratio or more among all sub-pixels of the organic light emitting display panel is equal to or greater than an individual threshold luminance value. According to claim 1,
The special screen above the threshold luminance value,
The organic light emitting display device of the organic light emitting display panel, the luminance of the outer region of the specific image area is a screen that is equal to or greater than an individual threshold luminance value. According to claim 1,
The special screen above the threshold luminance value,
The organic light emitting diode display is a screen in which the image displayed before the generation of the power-off signal is displayed in the same manner, and the luminance is higher than the threshold luminance value compared to before the generation of the power-off signal. According to claim 1,
and a controller detecting the generation of the power-off signal and outputting data for display of the special screen to the data driver. 7. The method of claim 6,
The controller is
When the generation of the power-off signal is detected, data for displaying the special screen is output to the data driver based on a continuous driving time in which the organic light emitting display device is continuously turned on before the generation of the power-off signal. organic light emitting display device. 8. The method of claim 7,
The controller is
outputting data for display of the special screen to the data driver when the continuous driving time is less than a predetermined threshold continuous driving time;
The organic light emitting display device outputs data different from data for displaying 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 is
When the continuous driving time is less than the critical continuous driving time, it is determined that the sensing processing condition for the organic light emitting display panel is not satisfied, and data for display of the special screen is output to the data driver;
When the continuous driving time is equal to or greater than the critical continuous driving time, it is determined that a sensing processing condition for the organic light emitting display panel is satisfied, and the other data is output to the data driver. According to claim 1,
and a power management unit configured to perform a power-off process for a driving voltage applied to the organic light emitting display panel after the special screen is displayed for more than the special screen display time in the organic light emitting display panel. 11. The method of claim 10,
The power management unit,
After performing the power-off process for the driving voltage, the organic light emitting display device performs the power-off process on the logic voltage used in the controller. According to claim 1,
After the special screen is displayed, the voltage of the driving voltage supply node to the organic light emitting display panel is lowered to a predetermined base value after a predetermined time has elapsed. In the organic light emitting display panel included in the organic light emitting display device,
a plurality of data lines carrying data voltages; and
A plurality of sub-pixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode,
Among the plurality of sub-pixels, sub-pixels of a certain ratio or more,
after the generation of the power-off signal, has a luminance greater than or equal to a predetermined threshold luminance value;
An organic light emitting display in which a data voltage for displaying a screen having a luminance greater than or equal to the predetermined threshold luminance value is applied to the data line based on a driving time in which the organic light emitting display device is continuously turned on before the generation of the power-off signal panel. In the organic light emitting display device,
an organic light emitting display panel in which a plurality of sub-pixels each including an organic light emitting diode and a driving transistor for driving the organic light emitting diode are disposed; and
a data driver outputting a data voltage equal to or greater than a predetermined threshold voltage value to at least one data line after the power-off signal is generated;
The data driver may be configured to output a data voltage equal to or greater than the predetermined threshold voltage to the at least one data line based on a continuous driving time in which the organic light emitting display device is continuously turned on before the power-off signal is generated. display device. In the driving method of an organic light emitting display device,
detecting generation of a power-off signal;
determining whether to display the special screen based on a continuous driving time in which the organic light emitting diode display is continuously turned on before the power-off signal is generated;
displaying, by the organic light emitting display panel, a special screen equal to or greater than a predetermined threshold luminance value for a period of longer than a predetermined special screen display time; and
A method of driving an organic light emitting display device comprising the step of processing a predetermined off sequence. 16. The method of claim 15,
Processing the off-sequence comprises:
A method of driving an organic light emitting display device for performing a power-off process for the driving voltage EVDD applied to the organic light emitting display panel. delete 16. The method of claim 15,
The determining step is
analyzing on-time information of the organic light emitting display device; and
and determining whether the continuous driving time in which the organic light emitting display is continuously turned on is less than a threshold continuous driving time before the generation of the power-off signal, and determining to display the special screen. How to drive. In the controller included in the organic light emitting display device,
a sensing unit detecting generation of a power-off signal;
a control unit controlling to display a special screen equal to or greater than a predetermined threshold luminance value for more than a predetermined special screen display time when the generation of the power-off signal is detected; and
and a data output unit outputting data for displaying the special screen based on a continuous driving time in which the organic light emitting display device is continuously turned on before the power-off signal is generated.

Images