KR20170080364A - Organic light emitting display device and method for driving thereof - Google Patents

Abstract

The organic light emitting diode display of the present invention includes a display panel, a data driver, a gate driver, and a controller, and the controller controls the refresh data supplied to the sensing subpixel differently depending on the position of the sensing subpixel line or the sensing subpixel Thereby reducing the level of the sub-pixel line on which the sensing is proceeding to the user's eyes.
Also, the method of driving an organic light emitting display according to the present invention generates recovery data supplied to a sensing subpixel differently depending on a position of a sensing subpixel line or a sensing subpixel after sensing, within a blank time interval, There is an effect that the level of the sub-pixel line on which the sensing is proceeding can be reduced.
In addition, the controller of the organic light emitting diode display of the present invention generates recovery data supplied to the sensing sub-pixel differently depending on the position of the sensing sub-pixel line or the sensing sub-pixel, so that the sub- It has the effect of reducing the level seen in the eyes.

Description

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

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

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

However, in the organic light emitting diode display, the threshold voltage (Vth) of the driving transistor and the characteristic value such as the mobility are varied for each of the subpixels for various reasons such as process variation and deterioration. Therefore, the amounts of currents driving the organic light emitting diodes are different, resulting in a luminance deviation between the subpixels.

In order to solve such a problem, an external compensation method for compensating a change in characteristics of driving transistors included in each sub-pixel through correction of input image data is disclosed.

When the external compensation method is applied to the organic light emitting display, the luminance of the sub-pixel line in which the mobility sensing for external compensation is performed is different from the luminance of the sub-pixel line in which mobility sensing for external compensation is not performed The subpixel line on which the mobility sensing for external compensation proceeds is generated in the user's eyes.

The phenomenon in which the subpixel line on which mobility sensing for external compensation is performed is visible to the user's eyes can be generated in various kinds of display devices using external compensation in addition to the organic light emitting display.

An object of the present invention is to provide an organic light emitting display and a method of driving the same that can reduce the level of a subpixel line in which mobility sensing for real-time external compensation is performed.

The present invention also relates to an organic light emitting display in which detection of sub-pixel lines is prevented by setting recovery data (RCV_Data) differently for the sensing sub-pixel lines or for each sensing sub-pixel for the entire area of the display panel, and There is another purpose in providing a driving method.

According to an aspect of the present invention, there is provided an OLED display including a display panel in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged in a matrix type, A gate driver for driving a plurality of gate lines, and a controller for controlling the data driver and the gate driver.

In addition, the controller controls, during the blank time period after the active time interval, to proceed to sensing the characteristic value for at least one sensing sub-pixel in the sensing sub-pixel line among the plurality of sub-pixel lines, , The recovery data is supplied to at least one sensing sub-pixel in the sensing sub-pixel line, and the recovery data is generated differently depending on the position of the sensing sub-pixel line or the sensing sub-pixel, There is an effect that the level of the subpixel line on which the sensing is proceeding can be reduced.

Further, the method of driving an organic light emitting display according to the present invention is a method for supplying image data to a first sub-pixel during an active time interval, and within a blank time interval after an active time interval, Pixels in the sensing subpixel line to be supplied to the first subpixel after the sensing is performed within the blank time interval, and controls the recovery data to be supplied to the first subpixel in the sensing subpixel line, Is generated differently depending on the position of the sensing sub-pixel line or the sensing sub-pixel, the level of the sub-pixel line in which mobility sensing for real-time external compensation proceeds can be reduced.

The controller of the organic light emitting diode display of the present invention further includes an image driving control unit for supplying image data to the first sub-pixel during the active time period, a sensing sub-pixel of the plurality of sub- A sensing control section for controlling the sensing for sensing a characteristic value for the first subpixel in the line to be performed, a control section for controlling the recovery data to be supplied to the first subpixel in the sensing subpixel line after the sensing progresses within a blank time interval And the recovery data is generated differently depending on the position of the sensing subpixel line or the sensing subpixel so that the level of the subpixel line in which mobility sensing for real-time external compensation proceeds can be reduced It is effective.

The organic light emitting display device and the driving method thereof according to the present invention have the effect of reducing the level of the subpixel line in which the mobility sensing for real-time external compensation proceeds, to the user's eyes.

The organic light emitting display device and the driving method thereof according to the present invention are characterized in that recovery data (RCV_Data) is set differently for the sensing sub-pixel lines or for each sensing sub-pixel for the entire area of the display panel, There is an effect of preventing the phenomenon.

1 is a system configuration diagram of an organic light emitting diode display according to the present invention.
FIG. 2 is a view illustrating a structure of subpixels included in a display panel applied to the OLED display of FIG. 1. Referring to FIG.
3 is a diagram illustrating each sub-pixel circuit of the organic light emitting diode display according to the present invention.
4 illustrates a subpixel compensation circuit of an OLED display according to an embodiment of the present invention.
5 is a view for explaining the principle of mobility sensing for a driving transistor DRT of an OLED display according to the present invention.
FIG. 6 is a diagram showing the mobility sensing drive and sensing timing according to the present invention.
FIG. 7 is a diagram illustrating a sub-pixel line in which mobility sensing for external compensation proceeds in a general organic light emitting display. Referring to FIG.
FIG. 8 is a diagram illustrating a light emission state according to the sensing progress position in the mobility sensing operation and the sensing process according to the present invention.
9 is a diagram showing the structure of a timing controller disposed in the organic light emitting diode display of the present invention.
10 is a graph showing luminance characteristics of the organic light emitting display according to display panel positions.
11 is a diagram showing a state in which recovery data is supplied to the source driver IC in the recovery drive control section of FIG.
12 and 13 are diagrams showing a state in which recovery data is output by setting an add data and an offset corresponding to control data in the recovery drive control unit according to the embodiment of the present invention.
FIG. 14 and FIG. 15 are views showing the offset of the control data for each position of the display panel of the OLED display device of the present invention.
16 is a flowchart showing a driving method of the organic light emitting diode display according to the present invention.

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.

1 is a system configuration diagram of an organic light emitting diode display according to the present invention.

Referring to FIG. 1, an OLED display 100 according to the present invention includes a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn, A data driver 120 connected to the upper or lower end of the display panel 110 and driving a plurality of data lines DL1 to DLm; a plurality of gate lines GL1- A timing controller 140 for controlling the data driver 120 and the gate driver 130, and the like.

Referring to FIG. 1, a plurality of subpixels SP are arranged in a matrix type on a display panel 110. Accordingly, a plurality of sub pixel lines exist in the display panel 110, and the sub pixel lines may be sub pixel rows or sub pixel columns. In the following, subpixel rows are described as subpixel lines.

The data driver 120 drives the plurality of data lines DL1 to DLm by supplying data voltages to the plurality of data lines DL1 to DLm. Here, the data driver 120 is also referred to as a " source driver ".

The gate driver 130 sequentially drives the plurality of gate lines GL1 to GLn by sequentially supplying scan signals to the plurality of gate lines GL1 to GLn. Here, the gate driver 130 is also referred to as a " scan driver ".

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

The gate driver 130 sequentially supplies a scan signal of an On voltage or an Off voltage to the plurality of gate lines GL1 to GLn in accordance with the control of the timing controller 140, (GL1 to GLn) sequentially.

When the specific gate line is opened, the data driver 120 converts the image data Data received from the timing controller 140 into analog data voltages Vdata and supplies them to the plurality of data lines DL1 to DLm , And drives the plurality of data lines DL1 to DLm.

The data driver 120 may include a logic portion including a shift register, a latch circuit, etc., a digital analog converter (DAC), an output buffer, and the like, (310 in FIG. 4) for sensing the characteristics of the subpixel in order to compensate for, for example, the threshold voltage and the mobility of the driving transistor, the threshold voltage of the organic light emitting diode, and the luminance of the subpixel) .

On the other hand, the timing controller 140 includes a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input data enable (DE) signal, a clock signal CLK, and the like And receives various timing signals from the outside (e.g., the host system).

The timing controller 140 may switch the input video data input from the outside in accordance with the data signal format used by the data driver 120 and output the converted video data Data, In order to control the driver 130, a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input DE signal, and a clock signal is received to generate various control signals, And outputs it to the driver 130.

The organic light emitting diode display 100 according to the present invention is an organic light emitting display device in which each sub pixel SP includes an organic light emitting diode (OLED) And a transistor (DRT: Driving Transistor).

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

On the other hand, in the organic light emitting diode display 100, circuit elements such as the organic light emitting diode OLED and the driving transistor DRT are deteriorated as the driving time of each subpixel SP becomes longer, Inherent characteristic values (e.g., threshold voltage, mobility, etc.) of the circuit elements such as the diode OLED and the driving transistor DRT are 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 such characteristic deviations of the circuit elements, a luminance deviation may occur between the sub-pixels SP. Accordingly, the luminance uniformity of the display panel 110 is deteriorated, and the image quality may be deteriorated.

Accordingly, the organic light emitting diode display 100 according to the present invention can provide a "pixel compensation function" for compensating a characteristic value deviation of a circuit element between sub pixels SP.

In the organic light emitting diode display 100 according to the present invention, each subpixel SP has a structure that enables the sensing of the subpixel characteristic value and the compensation of the subpixel characteristic value deviation.

In order to provide a subpixel compensating function, the organic light emitting diode display 100 according to the present invention includes a sensing structure for sensing a subpixel characteristic value and a characteristic value deviation between each subpixel using a sensing result of the sensing structure And a compensation structure for providing the compensation value.

Here, the subpixel characteristic value may include, for example, a characteristic value such as a threshold voltage Vth 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 mobility of the driving transistor DRT is taken as an example of the sub-pixel characteristic value.

FIG. 2 is a view illustrating a structure of subpixels included in a display panel applied to the OLED display of FIG. 1. Referring to FIG.

Referring to FIG. 2, at least three sub-pixels SP may form one unit pixel (P). In the following description, four subpixels (SP), for example red (R), white (W), green (G) and blue (B) Although the subpixel constitutes one unit pixel P, it is not limited thereto. In this case, one sensing line (RVL) is disposed in one pixel (P). Therefore, when d data lines DL1 to DLd are arranged in the horizontal line of the display panel 110, the number k of the sensing lines RVL is d / 4.

3 is a diagram illustrating each sub-pixel circuit of the organic light emitting diode display according to the present invention.

The exemplary subpixel in FIG. 3 is any subpixel supplied with the data voltage (Vdata) from the i-th data line (DLi, 1? I?? M) In the case of the first embodiment.

Referring to FIG. 3, each sub-pixel of the organic light emitting diode display 100 according to the present invention includes an organic light emitting diode (OLED) and a driving circuit for driving the same.

The driving circuit may include a driving transistor DRT, a switching transistor SWT, a sensing transistor SENT, and a storage capacitor Cst.

The driving transistor DRT drives the organic light emitting diode OLED by supplying a driving current to the organic light emitting diode OLED. The driving transistor DRT may be connected between the organic light emitting diode OLED and the driving voltage line DVL for supplying the driving voltage EVDD. The driving transistor DRT has a first node N1 corresponding to a source node or a drain node, a second node N2 corresponding to a gate node, and a third node N3 corresponding to a drain node or a source node .

The switching transistor SWT is connected between the data line DLi and the second node N2 of the driving transistor DRT and is turned on by receiving the scan signal SCAN to the 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 DLi to the second node N2 of the driving transistor DRT.

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 and supplies a sensing signal SENSE ) And is turned on. 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.

This sensing transistor SENT can also serve as a sensing path so that the sensing configuration can sense 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.

4 illustrates a subpixel compensation circuit of an OLED display according to an embodiment of the present invention.

4, the OLED display 100 includes a sensing unit 310 for sensing a sub-pixel characteristic value, a memory 320 for storing a sensing result of the sensing unit 310, And a compensation unit 330 for compensating the pixel characteristic value deviation.

For example, the sensing unit 310 may be included in the data driver 120, and the compensation unit 330 may be included in the timing controller 140.

The organic light emitting diode display 100 according to the present invention may be configured to sense the voltage application state of the first node N1 of the driving transistor DRT in the sub pixel SP to the sub pixel characteristic value sensing In order to control the necessary state, a switch (SAM) may be further included.

Through this switch SAM, one end Nc of the reference voltage line RVL may be connected to the reference voltage supply node Na or the node Nb of the sensing portion 310.

Referring to FIG. 4, the reference voltage line RVL is basically a line for supplying the reference voltage VREF to the first node N1 of the driving transistor DRT through the sensing transistor SENT.

Meanwhile, a line capacitor Cline is formed in the reference voltage line RVL. The sensing unit 310 senses a voltage charged in the line capacitor Cline on the reference voltage line RVL at a required point in time. Therefore, in the following, 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, when one pixel is composed of four subpixels (red subpixel, white subpixel, green subpixel, and blue subpixel) as shown in FIG. 2, have.

The sensing unit 310 includes a sensing line electrically connected to a first node N1 of a driving transistor DRT in a sub-pixel on a sensing sub-pixel line (SSPL) in which sensing driving is performed among a plurality of sub- RVL), and outputs a sensing value, thereby performing the sensing process.

The sensing unit 310 can sense the voltage charged in the line capacitor Cline on the sensing line RVL by the current flowing to the sensing line RVL.

Here, the voltage charged in the line capacitor Cline is the voltage of the sensing line RVL, and the first node N1 of the driving transistor DRT, which reflects the characteristic value (threshold voltage, mobility) ).

The voltage of the first node N1 of the driving transistor DRT is stored in the line capacitor Cline and the sensing unit 310 is connected to the first node N1 of the driving transistor DRT Since the charging voltage of the line capacitor Cline storing the voltage of the first node N1 of the driving transistor DRT is sensed instead of sensing the voltage of the sensing transistor SENT directly, The voltage of the first node N1 of the driving transistor DRT can be sensed.

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 310 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.

Each of the first node N1 and the second node N2 of the driving transistor DRT is initialized to the data voltage Vdata for mobility sensing and the reference voltage VREF, One node N1 floats and the voltage of the first node N1 of the driving transistor DRT rises.

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. Accordingly, the voltage of the first node N1 of the driving transistor DRT increases more sharply as the driving transistor DRT having a higher current capability (mobility) is.

The line capacitor Cline on the sensing line RVL is charged by the current flowing to the sensing line RVL through the driving transistor DRT in response to the voltage rise. The sensing unit 310 senses the voltage Vsense charged in the line capacitor Cline on the sensing line RVL.

The memory 320 may store a sensing value for each sensing sub-pixel line SSPL by a predetermined number N of sensing sub-pixel lines. The predetermined number N of sensing subpixel lines may be equal to the number of all subpixel lines existing in the display panel 110 in accordance with the usable capacity of the memory 320 or the like, It is possible.

The compensation unit 330 can perform property 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 value stored in the memory 320. [ Here, the characteristic value compensation process may include a mobility compensation process for compensating the mobility of the driving transistor DRT.

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 320, or changing the corresponding image data Data with the calculated compensation value .

The compensating unit 330 may change the image data Data through the mobility compensation process and supply the changed data to the data driver 120.

At this time, a digital analog converter (DAC) 300 in the data driver 120 converts the data voltage to a data voltage Vdata corresponding to an analog voltage and supplies the converted data voltage to the corresponding subpixel. Thus, characteristic value compensation (threshold voltage compensation, Compensation) is actually applied.

Through the compensator 330 described above, the characteristic value of the driving transistor can be compensated to reduce or prevent the luminance deviation between the subpixels.

Hereinafter, the principle of sensing the mobility of the driving transistor DRT in order to compensate for the mobility deviation between the driving transistors DRT will be briefly described with reference to Fig.

The sensing unit 310 described above may be implemented by including an analog digital converter (ADC) for converting an analog voltage value into a digital value.

5 is a view for explaining the principle of mobility sensing for a driving transistor DRT of an OLED display according to the present invention.

5, the principle of the motion sensing for the driving transistor DRT will be briefly described. A voltage obtained by adding a constant voltage (Vth_comp) to the data voltage Vdata to the gate node N2 of the driving transistor DRT . Here, the constant voltage Vth_comp is a voltage corresponding to the threshold voltage compensation value.

Thus, the current capability (i.e., mobility) of the driving transistor DRT can be relatively grasped through the amount of the voltage (? V) charged in the line capacitor Cline for a predetermined period of time, Gain is obtained.

This mobility sensing is characterized in that the sensing speed is fast because the driving transistor DRT is basically turned on. Therefore, the mobility sensing mode is also referred to as a fast mode (F-Mode).

The mobility compensation through the above-described mobility sensing can be performed by allocating a predetermined time during the screen driving. By doing so, the parameters of the driving transistor DRT varying in real time can be sensed and compensated.

In the present invention, the sensing operation includes a "sensing drive" for driving the corresponding subpixel so that the voltage at the first node N1 of the driving transistor DRT becomes a voltage state capable of reflecting the mobility of the driving transistor DRT The sensing unit 310 senses the voltage of the first node N1 of the driving transistor DRT in which the mobility of the driving transistor DRT is reflected, that is, the voltage charged in the line capacitor Cline on the sensing line RVL And a "sensing process" for sampling and measuring (sensing).

FIG. 6 is a diagram showing the mobility sensing drive and sensing timing according to the present invention.

Since the mobility sensing takes a relatively short time compared to the threshold voltage sensing, it can proceed while the screen is being driven.

For example, as shown in FIG. 6, there is a blank time interval based on the vertical synchronization signal VSYNC between the active time periods in which image frames are displayed. During the blank time interval, mobility sensing for one or more subpixel lines may proceed. Of course, considering the threshold voltage sensing time, the threshold voltage sensing may be performed for one or more subpixel lines during the blank time period.

Sub-pixels included in the corresponding sub-pixel line are driven (mobility sensing operation) for each blank time interval according to the mobility sensing, and the sensing unit 310 performs sensing processing (voltage measurement and conversion processing) for each blank time interval Can be performed.

As described above, since the sensing operation and the sensing process for the mobility sensing are performed in the blank time interval, the mobility sensing can be performed without greatly affecting the screen display.

FIG. 7 is a diagram illustrating a sub-pixel line in which mobility sensing for external compensation proceeds in a general organic light emitting display. Referring to FIG.

In FIG. 7, point A represents any one subpixel formed on a subpixel line in which mobility sensing for external compensation does not proceed, and point B represents a subpixel line on which mobility sensing for external compensation proceeds And represents any one of the subpixels formed.

7 (a) shows the luminance at the point A, and FIG. 7 (b) shows the luminance at the point B. FIG.

In the organic light emitting diode display 100, mobility sensing for external compensation is generally performed in units of one subpixel line (scan line). In particular, as shown in FIG. 6, Between the active time periods), and the vertical blank time.

In this case, no image is output at the vertical blank time in the sub-pixel line where the mobility sensing for external compensation proceeds. Accordingly, the subpixel line on which the mobility sensing for external compensation proceeds is indicated by a dark line as shown in Fig. For example, since the subpixels formed on the subpixel line where mobility sensing for external compensation is performed do not output an image, the subpixel line has a low luminance as compared with other subpixel lines .

More specifically, as shown in FIG. 7B, in a sub-pixel where sensing for external compensation is performed, a period (No emission) in which the sub-pixel does not emit light is generated. In this case, the non-emission period (No emission) in which the organic light emitting diode does not emit light includes not only a period during which the mobility sensing is performed as shown in Fig. 7 (b) (Curve section) for charging the first electrode for light emission of the light emitting diode (OLED).

However, as shown in Fig. 7 (a), the subpixels not subjected to sensing for external compensation continuously emit light.

Therefore, the luminance of the sub-pixel line for which the mobility sensing for external compensation proceeds is lower than the luminance of the sub-pixel line for which mobility sensing for external compensation is not performed. Accordingly, the sub-pixel line where the mobility sensing for external compensation proceeds is displayed to the user's eyes.

As described above, even if the mobility sensing is performed during the blank time interval instead of the active time interval corresponding to each frame display driving interval, the sub-pixel line in which the mobility sensing is performed in the active time interval after the sensing driving and sensing process The subpixel does not emit light and a subpixel line (sensing subpixel line) on which mobility sensing is proceeding may appear on the screen. This phenomenon is referred to as "sensing sub-pixel line appearance phenomenon ".

In order to mitigate such a phenomenon of sensing the sub-pixel line, when the sensing of the mobility sensing operation is performed during the blank time interval, the screen displayed in the active time interval (i frame) before the mobility sensing operation and the sensing process is shifted It is necessary to perform Recovery Driving Control to make it appear continuously even in the next active time period (i + 1 frame) after the sensing operation and the sensing operation.

FIG. 8 is a diagram illustrating a light emission state according to the sensing progress position in the mobility sensing operation and the sensing process according to the present invention.

Referring to FIG. 8, the organic light emitting diode display 100 according to the present invention performs image driving for i frames during an active time interval, and sensing driving and sensing processes are performed in a blank time interval. After the blank time interval, the image is driven for the (i + 1) -th frame during the next active time interval.

It is necessary to perform Recovery Driving Control to reduce the screen image disturbance between the image frames before and after the sensing operation during the blank time interval.

Accordingly, the timing controller 140 according to the present invention controls the timing controller 140 so that the image data in the previous active time interval for the i-th frame (the normal driving data (Also referred to as " normal driving data ") to the corresponding subpixel.

Here, the video data (normal driving data: reference recovery data) in the previous active time interval is divided into the video data (normal driving data: reference recovery data) in the previous active time interval in accordance with the difference between the length Trcv of the time of light emission with the recovery driving data and the length Tnrm of the time The magnitude of the recovery voltage to be added can be determined differently.

The larger the difference between the length Trcv of the light emission with the recovery drive data and the length Tnrm of the light emission time with the normal drive data, the more the difference between the video data (normal drive data: reference recovery data) The recovery amount can be reduced.

The smaller the difference between the length Trcv of the light emission time with the recovery data and the length Tnrm of the light emission time with the normal driving data is, the more recovery is made to the video data (normal driving data: reference recovery data) Can be increased.

Here, the recovery amount may be inversely proportional to the difference between the length of the time Trcv for emitting light in the recovery driving data and the length of time Tnrm for emitting light in the normal driving data.

The smaller the difference, the larger the recovery amount. That is, as the difference becomes smaller, the recovery drive data becomes larger than the normal drive data.

The more the difference is, the smaller the recovery amount. That is, as the difference becomes larger, the recovery drive data becomes equal to the normal drive data.

8, in the case of sensing a subpixel line in the display panel central area CA (Case 1), the length Trcv of the time to emit light with recovery drive data and the length Tnrm ) Is small, the recovery amount is large, and the recovery drive data has a large data value as compared with the normal drive data.

8, in the case of sensing the uppermost subpixel line in the upper area UA of the display panel (Case 2), the length Trcv of the time to emit light with the recovery driving data is the length of the time Tnrm), the difference between the length Trcv of the time of light emission with the recovery drive data and the length of the time Tnrm of the time of light emission by the normal drive data is very large, so that the recovery amount becomes very small. Therefore, the normal drive data and the recovery drive data may be the same or substantially the same.

8, in the case of sensing the lowermost subpixel line in the lower area DA of the display panel (Case 3), the length Trcv of the time to emit light with recovery drive data is the length of time Tnrm, that is, the difference between the length Trcv of the time of light emission with the recovery drive data and the length of the time Tnrm of light emission with the normal drive data is very large, and the recovery amount is very small. Therefore, the normal drive data and the recovery drive data may be the same or substantially the same.

As described above, in order to prevent the sensing phenomenon of the sensing sub-pixel line due to the real-time sensing, the recovery driving control needs to have a different recovery voltage for each sensing sub-pixel line.

9 is a diagram showing the structure of a timing controller disposed in the organic light emitting diode display of the present invention.

9, the timing controller 140 of the OLED display 100 according to the present invention includes a first sub-pixel (a sensing sub-pixel) for an active time period in which an image frame is displayed on the display panel 110 A sensing operation for sensing a characteristic value of the first sub-pixel in the sensing sub-pixel line among the plurality of sub-pixel lines within a blank time interval after the active time interval is performed And a recovery driving control unit 930 for controlling the recovery data to be supplied to the first sub pixel in the sensing sub pixel line after the sensing progresses within the blank time interval do.

The recovery data RCV_Data may be the sum of the reference recovery data REF_RCV_Data and the control data CON_Data corresponding to the image data of the previous image frame described above (RCV_Data = REF_RCV_Data + CON_Data).

 The recovery data (RCV_Data) may mean the recovery driving data described above. Hereinafter, it is referred to as recovery data (RCV_Data).

The recovery data RCV_Data is generated differently depending on the position of the sensing sub-pixel line or the sensing sub-pixel line of the display panel 110. Depending on the position of the sensing sub-pixel line or the sensing sub-pixel, the control data CON- .

Accordingly, the recovery data (RCV_Data) includes reference recovery data (RCV_Data) corresponding to the image data supplied to the sensing subpixel during the active time interval before the blank time interval, reference recovery data (RCV_Data) corresponding to the sensing subpixel line Based on the control data CON_Data determined according to the position.

The organic light emitting display device and the driving method thereof according to the present invention can reduce the number of sensing subpixel lines or the number of sensing subpixel lines for the entire area of the display panel 110 without changing the recovery data RCV_Data only for a specific area of the display panel 110 The recovery data (RCV_Data) is set differently for the sensing subpixel to prevent the phenomenon of the sensing subpixel line becoming visible.

Particularly, when the display panel is divided into the upper / middle / lower regions and the recovery data (RCV_Data) is different for each region, there arises a problem that a voltage deviation applied to each region is visually recognized. In the present invention, (RCV_Data) set for each of the above-mentioned locations.

10 is a graph showing luminance characteristics of the organic light emitting display according to display panel positions.

10, even if the control data (offset: OFFSET) fixed to the reference recovery data REF_RCV_Data is set to supply the recovery data RCV_Data in order to prevent the sensing sub-pixel line from being seen, The bright line and the dark line are visible in the left, center, and right regions of FIG.

The recovery data (RCV_Data) is not made different according to the difference between the length Trcv of the time of light emission by the recovery drive data and the length of the time of light emission by the normal drive data Tnrm, In some cases, a phenomenon may occur. However, luminance deviations may occur in each region depending on the inherent characteristics of the display panel 110. [

For example, when the gate driver 130 is disposed on both sides of the display panel 110, a scan signal and a sensing signal are supplied to the display panel 110 from both edges of the display panel 110. At this time, the deviation of the scan signal or the sensing signal outputted from the gate driver 130 is the largest, and the deviation is reduced due to the increase of the resistance of the gate line toward the central region of the display panel 110.

Therefore, in the region where the deviation of the signal is large, the kickback voltage (DELTA Vp) is large and the degree of drop of the data voltage supplied to each subpixel becomes large. That is, the kickback voltage DELTA Vp is the largest at both edges of the display panel 110, and the kickback voltage DELTA Vp becomes smaller toward the center region of the display panel 110. [

As described above, the difference in the Kickback voltage? Vp for each region of the display panel 110 causes a luminance variation, which exhibits a low luminance characteristic at both edges of the display panel 110 and a relatively high luminance characteristic at the center.

When the reset data is supplied to the display panel 110 by setting the fixed control data OFFSET value without considering the above characteristics, in the left and right regions of the display panel 110 by the recovery data RCV_Data, There arises a problem that a bright line is visible (a data voltage corresponding to luminance is smaller than the recovery data) and a dark line is visible in the central region (a data voltage corresponding to brightness is larger than recovery data).

In the present invention, as shown in FIGS. 14 and 15, different offsets (control data) are set for the left, center, and right regions of the display panel 110, To improve the dark line defect in the area.

In the present invention, the display panel 110 is provided with different offsets (control data) for two or more areas, generates recovery data (RCV_Data) based on the offsets, and supplies recovery data (RCV_Data) Thereby improving defective dark lines or bright lines caused by the display panel 110 areas.

FIG. 11 is a view showing a state in which recovery data is supplied to the source driver IC in the recovery drive control section of FIG. 9, and FIGS. 12 and 13 are diagrams showing a state in which recovery data And an offset are set to output recovery data.

Referring to FIG. 11, in the timing controller 140 of the OLED display 100 of the present invention, after the sensing progresses within a blank time interval, the first sub-pixel (sensing sub-pixel) in the sensing sub- And a recovery drive control unit 930 for controlling the recovery data (RCV_Data) to be supplied.

The recovery drive control unit 930 supplies the recovery data RCV_Data to the source driver IC SDIC and the recovery SDC supplies the recovery data RCV_Data to the display panel 110. [

As shown in the drawing, the recovery drive control unit 930 of the timing controller 140 according to the present invention controls the reference recovery data REF_RCV_Data, which is the image data of the previous image frame, to the position of the sensing sub- (RCV_Data = REF_RCV_Data + CON_Data) by additionally adding control data CON_Data that is generated differently according to the control data CON_Data.

The control data CON_Data can be generated in various forms. In FIG. 12, the control data CON_Data is generated in the form of ADD_Data for each sensing subpixel and formed into a lookup table (LUT).

The add data ADD_Data is subjected to sensing for sensing characteristic values of at least one sensing sub-pixel of the sensing sub-pixel lines among the plurality of sub-pixel lines, One node voltage, and the first node voltage of the drive transistor when the reference recovery data (REF_RCV_Data) is supplied, and may be generated in the form of additional data voltages corresponding to these sensing voltage differences.

The add data ADD_Data is generated in the form of a lookup table (LUT) because it can be generated to match all subpixels included in the sensing subpixel line of the display panel 110.

Therefore, the recovery data (RCV_Data) is set to the reference recovery data (REF_RCV_Data) + add data (ADD_Data).

Therefore, since the ADD_Data (additional data voltage) reflects the characteristics of each area of the display panel 110 and the characteristics of each signal line, it is possible to prevent the appearance of the sensing subpixel line after real time sensing Since the recovery data (RCV_Data) is supplied in units of subpixels, it is possible to improve the visibility defects that can be caused by the deviation of the recovery data (RCV_Data).

13, the offset information for each position of the display panel 110 is extracted from the offset memory 1300 in which the offset information corresponding to the control data CON_Data is stored, and the recovery drive control unit 930 extracts the recovery data RCV_Data).

Therefore, recovery data (RCV_Data) = reference recovery data (REF_RCV_Data) + control data (CON_Data: OFFSET).

The offset information stored in the offset memory 1300 may be obtained by dividing the display panel 110 into at least two regions in the left / center / right / And may be set offset information for each position corresponding to the area.

In addition, the offset information set for each divided area may be information set according to the luminance deviation for each divided area. That is, although the offset for each area is set, it can be set to correspond to the luminance deviation information generated by the data voltage supplied to the display panel 110.

A method of setting the offset information corresponding to the control data (CON_Data) so as to generate the recovery data (RCV_Data) for each area or position will be described in detail with reference to FIG. 14 and FIG.

FIG. 14 and FIG. 15 are views showing the offset of the control data for each position of the display panel of the OLED display device of the present invention.

14 and 15, different offsets can be set for the left and right sides corresponding to the edge areas of the display panel 110 and the center corresponding to the center area of the display panel 110. (OFFSET_L, OFFSET_R, OFFSET_C)

Although not shown in the drawing, the display panel 110 can be divided into upper, middle, and lower portions in the vertical direction, and different offsets can be set for the respective regions.

The offset for each area can be set in consideration of the luminance deviation information of the display panel 110. [

As shown in FIG. 14, when different offsets (OFFSET_L, OFFSET_R, OFFSET_C) are set in the left, center and right regions of the display panel 110 so as to correspond to the data voltages (solid lines) No bright line or dark line defect occurred in left / right and center.

Referring to FIG. 15, in the present invention, the display panel 110 may be divided into a plurality of regions P1 to P8, and offsets corresponding to positions of the divided regions may be set differently.

In particular, since a plurality of regions (P1 to P3 or P4 to P6 or P7 to P9) can be divided in the direction parallel to the sensing sub-pixel line and different offsets corresponding to the characteristics of the display panel can be set for each region The luminance deviation due to the kickback voltage can be improved.

16 is a flowchart showing a driving method of the organic light emitting diode display according to the present invention.

Referring to FIG. 16, the driving method of an organic light emitting display according to the present invention includes a video sensing step S1601 for displaying an image frame, a real time sensing step S1602 during a blank time interval between image frames, And a recovery driving step (S1603) for preventing the sensing of the sensing sub-pixel line after the real-time sensing step.

More specifically, the image driving step S1601 includes supplying image data to a first sub-pixel (sensing sub-pixel) during an active time interval, and the real-time sensing step S1602 includes the steps of: And controlling the sensing to sense the characteristic value for the first subpixel in a plurality of subpixel lines within a blank time interval after the interval, wherein the recovery driving step (S1603) Thereafter, controlling to be supplied with recovery data that is differently generated depending on the position of the sensing sub-pixel line or the sensing sub-pixel line as the first sub-pixel in the sensing sub-pixel line.

As described above, the organic light emitting display device and the driving method thereof according to the present invention have the effect of reducing the level of the subpixel line in which the mobility sensing for real-time external compensation proceeds, to the user's eyes.

The organic light emitting display device and the driving method thereof according to the present invention are characterized in that recovery data (RCV_Data) is set differently for the sensing sub-pixel lines or for each sensing sub-pixel for the entire area of the display panel, There is an effect of preventing the phenomenon.

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 inventions. , 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: Display panel
120: Data driver
130: gate driver
140: Timing controller
910:
920:
930: Recovery drive control unit

Claims (13)

A display panel in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged in a matrix type;
A data driver for driving the plurality of data lines;
A gate driver for driving the plurality of gate lines;
And a controller for controlling the data driver and the gate driver,
The controller comprising:
During the blank time period after the active time interval,
Controls the sensing to sense a characteristic value for at least one sensing sub-pixel in a sensing sub-pixel line among a plurality of sub-pixel lines,
And controlling the recovery data to be supplied to at least one sensing sub-pixel in the sensing sub-pixel line after the sensing progresses,
The recovery data includes:
Wherein the sensing subpixel line is differently generated depending on a position of the sensing subpixel line or the sensing subpixel. The method according to claim 1,
The controller comprising:
Based on the reference recovery data corresponding to the image data supplied to the sensing subpixel during the active time interval before the blank time interval and the control data determined according to the position of the sensing subpixel line or the sensing subpixel, And generates recovery data. 3. The method of claim 2,
The control data includes:
Wherein the add data corresponding to each subpixel arranged in the entire area of the display panel is implemented as a lookup table (LUT). The method of claim 3,
The add data included in the look-up table (LUT)
Wherein the sensing voltage is sensed in the compensating step after the sensing of the sensing sub-pixel, and the voltage difference information sensed when the reference recovery data is supplied. 3. The method of claim 2,
The control data includes:
Wherein the offsets are offset from the set offset information for each position of the display panel. 6. The method of claim 5,
The offset may be,
Wherein the offset is one of an offset set for two or more areas of the display panel. The method according to claim 6,
Wherein the offset set for each of the two or more areas of the display panel comprises:
And an offset set in accordance with a luminance deviation of at least two areas of the panel. The method according to claim 1,
Each of the sub-
A driving transistor for driving the organic light emitting diode, a sensing transistor connected between a first node of the driving transistor and a reference voltage line, a switching transistor connected between a second node of the driving transistor and the data line, And a storage capacitor connected between a first node and a second node of the driving transistor,
And a sensing unit for sensing a voltage of the reference voltage line or a voltage of a first node of the driving transistor. 9. The method of claim 8,
The characteristic values for the sensing sub-
Wherein the sensing sub-pixel is mapped to the driving transistor in the sensing sub-pixel. Supplying the image data to the first sub-pixel during the active time interval;
Controlling sensing to sense a characteristic value for the first sub-pixel in a sensing sub-pixel line among a plurality of sub-pixel lines within a blank time interval after the active time interval; And
Controlling the recovery data to be supplied to the first sub-pixel in the sensing sub-pixel line after the sensing progresses within the blank time interval,
The recovery data includes:
Wherein the sensing subpixel line is different from the sensing subpixel line or the sensing subpixel. 11. The method of claim 10,
The recovery data includes:
And generating control data based on the reference recovery data corresponding to the image data supplied to the sensing subpixel during the active time interval before the blank time interval and the control data determined according to the position of the sensing subpixel line or the sensing subpixel A method of driving an organic light emitting display device. An image driving control unit for supplying image data to a first sub-pixel during an active time interval;
A sensing controller for controlling the sensing for sensing a characteristic value of the first sub pixel in the sensing sub pixel line among the plurality of sub pixel lines within a blank time interval after the active time interval; And
And a recovery drive control section for controlling the recovery data to be supplied to the first sub-pixel in the sensing sub-pixel line within the blank time interval after the sensing progresses,
The recovery data includes:
Wherein the sensing subpixel line is different from the sensing subpixel line or the sensing subpixel. 13. The method of claim 12,
The recovery data includes:
And generating control data based on the reference recovery data corresponding to the image data supplied to the sensing subpixel during the active time interval before the blank time interval and the control data determined according to the position of the sensing subpixel line or the sensing subpixel A controller of an organic light emitting display.

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