KR20190030534A - Organic light emitting display device and method for driving the organic light emitting display device - Google Patents

Abstract

Embodiments of the present invention may provide an organic light emitting display device capable of providing an image with increased luminance according to a user environment and a driving method thereof. The organic light emitting display device comprises: a display panel on which a plurality of sub-pixels are arranged; a sensing unit measuring a sensing voltage from the display panel and outputting sensing data for at least one of the sub-pixels; and a compensation unit obtaining predesignated compensation gain data for performing compensation for at least one sub-pixel based on an accumulated driving time and the sensing data of the display panel and correcting the compensation gain data to correspond to a user environment of the display panel using at least one of the sensing data and a user command.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting display device and 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 [0002] As an information-oriented society develops, there have been various demands for a display device for displaying images. Recently, a liquid crystal display (LCD), a plasma display panel (PDP) And various display devices such as an organic light emitting display (OLED) device are used.

Recently, an organic light emitting diode (OLED) display device that has been well known in the art has an advantage of high response speed, contrast ratio, luminous efficiency, brightness and viewing angle by using an organic light emitting diode (OLED)

The organic light emitting display device can adjust the brightness by adjusting the amount of the driving current flowing through the organic light emitting diode according to the gradation of the image data. However, in the organic light emitting diode, the operating point voltage (threshold voltage) of the organic light emitting diode increases with the lapse of the light emission time, and as a result, the degradation of the light emitting efficiency may occur. In particular, the characteristics of the organic light emitting diode may not always be constant due to the scattering of the process, and the deterioration of the organic light emitting diode may be compensated for using the degradation compensation due to such a difference in characteristics.

However, if deterioration of a circuit element (for example, a transistor, an organic light emitting diode, or the like) in a pixel of an organic light emitting display device is advanced, the afterimage phenomenon may be more serious or permanent if deterioration compensation is performed to improve luminance.

It is an object of embodiments of the present invention to provide an organic light emitting display device capable of performing adaptive compensation according to a use environment and a driving method thereof.

It is another object of embodiments of the present invention to provide an organic light emitting display device and a method of driving the same that can prevent image deterioration and afterimage of an organic light emitting display panel according to a use environment and improve image quality and lifetime.

It is another object of embodiments of the present invention to provide an organic light emitting display device and a driving method thereof that can provide an image with improved luminance according to the use environment.

In one aspect, an OLED display according to embodiments of the present invention includes a display panel on which a plurality of subpixels are arranged, a sensing panel for sensing data from at least one subpixel of the plurality of subpixels by measuring a sensing voltage from the display panel, Acquiring predetermined compensation gain data to perform compensation for at least one subpixel on the basis of an outputting sensing unit and a cumulative driving time of the display panel and outputting the compensation gain data to the display panel using at least one of the sensing data and the user command, And the compensating unit corrects the compensation gain data so as to correspond to the use environment of the display device.

The compensation gain data according to the embodiments of the present invention includes deterioration compensation data including a deterioration compensation gain for performing deterioration compensation for at least one subpixel in accordance with the degree of deterioration discriminated from the sensing data, And target compensation data including a target compensation gain for performing compensation.

When the deterioration compensation command is received by the user command, the compensation unit can determine the use environment by comparing the deterioration compensation command with the received deterioration compensation period to perform the deterioration compensation.

The compensating section discriminates the degree of deterioration with respect to at least one subpixel from the sensing data at the command reception time and the deterioration compensation period and calculates a deterioration compensation gain for obtaining deterioration compensation gain corresponding to the deterioration degree of the deterioration compensation gain included in the deterioration compensation data Section.

The compensation unit may include a target compensation unit that determines a cumulative drive time in a target compensation cycle predetermined to perform target compensation and obtains a target compensation gain corresponding to the cumulative drive time among the target compensation gains included in the target compensation data.

The compensating unit may include a compensating gain compensating unit for compensating the deterioration compensation gain and the target compensating gain according to the use environment determined by the use environment.

The compensation gain correction unit can correct the deterioration compensation gain and the target compensation gain to be increased if the command reception time is earlier than the deterioration compensation period.

The compensation gain correction unit may obtain the first deterioration weight and the first target weight for correcting the deterioration compensation gain and the target compensation gain to be reduced if the command reception time is later than the deterioration compensation period.

The compensation gain correction unit calculates a time difference between the command reception time and the previous command reception time when the command reception time is earlier than the degradation compensation period and if the calculated time difference is less than the predetermined reference time difference, The second degradation weight and the second target weight to obtain the second degradation weight.

The compensation gain correction unit may increase or decrease the first deterioration weight and the first target weight corresponding to the time difference between the deterioration compensation period and the command reception time.

The compensation gain correction unit may increase the second degradation weight and the second target weight in accordance with the time difference between the command reception time and the previous command reception time.

The compensating gain compensating unit may obtain a compensating degradation compensation gain for performing deterioration compensation for at least one subpixel using the deterioration compensation gain, the first deterioration weight, and the second deterioration weight.

The compensation gain correction unit compensates the deterioration of at least one subpixel by obtaining a correction target compensation gain for performing target compensation for at least one subpixel using the target compensation gain, the first target weight, and the second target weight .

The compensation unit may include a target compensation unit that obtains a target compensation gain of the target compensation data according to the cumulative driving time.

The compensating section may include a deterioration compensating section for discriminating the degree of deterioration with respect to at least one subpixel from the sensing data and acquiring the deterioration compensation gain corresponding to the degree of deterioration in the deterioration compensation gain included in the deterioration compensation data.

The compensation unit compensates deterioration of at least one subpixel according to the target compensation gain, and obtains a luminance compensation gain by combining the deterioration compensation gain and the target compensation gain for at least one predetermined luminance compensation period, And a compensation gain correction unit for compensating for luminance and deterioration of at least one subpixel.

The compensation gain correction unit may compensate for deterioration of at least one subpixel according to the target compensation gain after the luminance compensation period.

The compensation gain correction unit may adjust the luminance compensation gain to converge to the target compensation gain until the next luminance compensation period after the luminance compensation period.

The compensation gain correction unit can maintain the luminance compensation gain obtained until the next luminance compensation period after the luminance compensation period.

In another aspect, a method of driving an organic light emitting display according to embodiments of the present invention includes obtaining predetermined compensation gain data to perform compensation for at least one subpixel based on a cumulative driving time of a display panel can do.

The driving method may include correcting the compensation gain data to correspond to the use environment of the display panel using at least one of the sensing data and the user command.

According to embodiments of the present invention as described above, it is possible to provide an OLED display capable of performing adaptive deterioration and residual image compensation according to a use environment and a driving method thereof.

In addition, according to embodiments of the present invention, it is possible to provide an organic light emitting display device and a driving method thereof, which can prevent deterioration and afterimage of the organic light emitting display panel according to the use environment and improve image quality and lifetime.

Further, it is possible to provide an organic light emitting display device and a driving method thereof that can provide an image with improved brightness according to the use environment.

1 is a schematic system configuration diagram of an organic light emitting diode display 100 according to embodiments of the present invention.
2 is an exemplary view of a sub-pixel structure of an organic light emitting diode display 100 according to embodiments of the present invention.
Fig. 3 shows the configuration of the compensator of Fig.
Fig. 4 shows an example of a compensation curve and a target curve.
Fig. 5 shows an example of degradation compensation according to the characteristics of the target curve.
6 illustrates a method of driving an OLED display according to an embodiment of the present invention.
7 shows an example of a weight look-up table.
8 is a diagram schematically showing the concepts of the correction deterioration compensation gain and the correction target compensation gain.
9 illustrates a method of driving an OLED display according to another embodiment of the present invention.
10 and 11 illustrate a case where the target compensation period and the luminance compensation period are alternately displayed according to the driving method of the OLED display of FIG.

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

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

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

1, the OLED display 100 according to the present embodiment includes a plurality of data lines DL and a plurality of gate lines GL, a plurality of data lines DL, An OLED display panel 110 in which a plurality of sub pixels (SP) defined by a gate line GL are arranged, a data driver 120 driving a plurality of data lines DL, A gate driver 130 for driving the gate line GL, a controller 140 for controlling the data driver 120 and the gate driver 130, and the like.

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

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

The controller 140 may be a timing controller used in a conventional display technology or a control device including a timing controller to perform other control functions. In the present invention, the controller 140 may include a compensation unit that performs a compensation process for compensating for deterioration, afterimage, and luminance of a sub-pixel according to the user's environment of the organic light emitting display device 100. [

The controller 140 may be implemented as a separate component from the data driver 120, or may be implemented as an integrated circuit together with the data driver 120.

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

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

Each source driver integrated circuit (SDIC) may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit (SDIC) may further include an analog to digital converter (ADC), as the case may be.

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

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

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

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

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

1, the data driver 120 may be located only on one side (for example, on the upper side or the lower side) of the organic light emitting display panel 110, and in some cases, depending on the driving method, And may be located on both sides (e.g., upper and lower sides) of the display panel 110.

1, the gate driver 130 may be located only on one side (e.g., the left side or the right side) of the organic light emitting display panel 110, and depending on the driving method, the panel design method, And may be located on both sides (e.g., left and right sides) of the light emitting display panel 110.

The controller 140 described above is capable of outputting various kinds of signals including the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the input data enable signal (DE), and the clock signal (CLK) Timing signals from the outside (e.g., the host system).

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

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

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

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

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

Each subpixel SP arranged in the organic light emitting display panel 110 includes an organic light emitting diode (OLED), a driving transistor for driving the organic light emitting diode (OLED) And the like.

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.

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

Referring to FIG. 2, in the organic light emitting diode display 100 according to the present embodiment, each of the sub-pixels SP basically includes an organic light emitting diode OLED, a driving circuit for driving the organic light emitting diode OLED A first transistor T1 for transmitting a data voltage to a first node N1 corresponding to a gate node of a driving transistor DRT, a second transistor Tl2 for providing a sensing function, T2) and a storage capacitor (Cst) for holding a data voltage corresponding to a video signal voltage or a voltage corresponding thereto for one frame time.

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

A base voltage EVSS may be applied to the second electrode of the organic light emitting diode OLED.

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

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

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

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

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

The driving transistor DRT and the first transistor T1 may be implemented as an n-type or a p-type as illustrated in FIG.

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

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

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

The storage capacitor Cst is not a parasitic capacitor (for example, Cgs or Cgd) which is an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT, And is an external capacitor intentionally designed outside the driving transistor DRT.

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

By further including the second transistor T2 described above, the voltage state of the second node N2 of the driving transistor DRT in the sub-pixel SP can be effectively controlled.

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

Also, the second transistor T2 may be utilized as one of the voltage sensing paths for the second node N2 of the driving transistor DRT.

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

In some cases, the scan signal SCAN and the sense signal SENSE may be the same gate signal. In this case, the scan signal SCAN and the sense signal SENSE may be commonly applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through the same gate line.

The OLED display 100 includes a sensing unit 210 for generating and outputting sensing data through voltage sensing in order to determine a characteristic value for a subpixel, A compensation unit 220 for performing a compensation process for compensating a characteristic value of a subpixel and a memory unit 230 for storing a compensation value calculated in the compensation unit 220, ), And the like.

The memory unit 230 may receive and store sensing data from the sensing unit 210 and may transmit the stored sensing data to the compensating unit 220. However, in some cases, the compensation unit 220 directly receives the sensing data, calculates the compensation value, and then stores the compensation value and the sensing data in the memory unit 230 together.

For example, the sensing unit 210 may include at least one analog-to-digital converter (ADC). The sensing data output from the sensing unit 210 may be, for example, a Low Voltage Differential Signaling (LVDS) data format.

Each analog-to-digital converter (ADC) may be contained within each source driver integrated circuit (SDIC) included in the data driver 120 and, in some cases, may be external to the source driver integrated circuit . ≪ / RTI >

The compensation unit 220 may be included in the controller 140 or may be provided outside the controller 140 in some cases. The compensation unit 220 may be referred to as a compensation processor.

The memory unit 230 may store predetermined initial compensation data and may store sensing data applied from the sensing unit 210 or a compensation value calculated by the compensation unit 220. [ However, the data stored in the memory unit 230 is not limited thereto. For example, the memory unit 230 may store image data applied from a host device (not shown) while driving the display panel 110, and may transmit the stored data to the compensation unit 220. [

The memory unit 230 may be included outside the controller 140, and in some cases, may be included in the controller 140.

2, the OLED display 100 according to the present embodiment includes an initialization switch SPRE for controlling whether a reference voltage Vref is applied to a reference voltage line RVL, And a sampling switch (SAM) for controlling connection between the sensing unit (RVL) and the sensing unit (210).

The initialization switch SPRE is connected to the second node N2 of the driving transistor DRT so that the second node N2 of the driving transistor DRT in the sub-pixel SP becomes a voltage state reflecting the characteristic value of the desired circuit element. To the voltage application state.

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

The sampling switch (SAM) is turned on to electrically connect the reference voltage line (RVL) and the sensing unit 210.

The sampling switch SAM is turned on so that the second node N2 of the driving transistor DRT in the subpixel SP turns on when the voltage state reflects the characteristic value of the desired circuit element Respectively.

When the sampling switch SAM is turned on, the sensing unit 210 may sense the voltage of the connected reference voltage line RVL.

If the sensing unit 210 senses the voltage of the reference voltage line RVL and the second transistor T2 is turned on and the resistance component of the driving transistor DRT can be ignored, May correspond to the voltage of the reference voltage line RVL, that is, the voltage of the second node N2 of the driving transistor DRT.

If a line capacitor is present on the reference voltage line RVL, the voltage Vsen sensed by the sensing unit 210 may be a voltage charged in the line capacitor on the reference voltage line RVL. Here, the reference voltage line RVL is also referred to as a sensing line.

For example, the voltage Vsen sensed by the sensing unit 210 may be a voltage value (Vdata-Vth or Vdata-Vth) including the threshold voltage Vth or the threshold voltage deviation Vth of the driving transistor DRT, Here, Vdata is the data voltage for sensing driving) or a voltage value for sensing the mobility of the driving transistor DRT.

On the other hand, the reference voltage lines RVL may be arranged 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), the reference voltage line RVL is divided into four subpixel columns , A white subpixel column, a green subpixel column, and a blue subpixel column).

 In the OLED display 100 according to the present embodiment, as the driving time of each sub-pixel SP becomes longer, the driving voltage of the organic light emitting diode OLED, the driving transistor DRT, Degradation can proceed.

As the driving time increases, a characteristic value deviation of the driving transistor DRT due to the deterioration of the driving transistor DRT occurs, and a characteristic value deviation of the organic light emitting diode OLED due to deterioration of the organic light emitting diode OLED also occurs .

In other words, when the organic light emitting display 100 is driven for a long time, the organic light emitting diode OLED of each sub pixel may be deteriorated by a driving stress to cause a screen abnormal phenomenon such as afterimage.

In order to compensate for the unrecoverable residual image caused by the deterioration of the organic light emitting diode (OLED), a process of grasping the degree of deterioration of the organic light emitting diode (OLED) may be required.

In order to understand the degree of deterioration of the organic light emitting diode (OLED), there is a method of sensing the threshold voltage (Vth_OLED) of the organic light emitting diode (OLED).

According to the method of sensing the threshold voltage Vth_OLED of the organic light emitting diode OLED, when a current flows in the organic light emitting diode OLED, a voltage is applied to the organic light emitting diode OLED by the threshold voltage Vth_OLED , The current flowing in the driving transistor DRT varies according to the voltage (OLED voltage) applied to the organic light emitting diode OLED, and the voltage (OLED voltage) can be sensed. That is, the organic light emitting diode (OLED)

In this manner, the degradation of the organic light emitting diode (OLED) can be compensated by adjusting the data voltage applied to each subpixel according to the degree of deterioration based on the sensed voltage (OLED voltage).

Fig. 3 shows the configuration of the compensator in Fig. 2, and Fig. 4 shows an example of the compensation curve and the target curve.

3, the compensating unit 220 includes a deterioration compensating unit 310 for compensating deterioration due to the driving current of the organic light emitting diode OLED, a target compensating unit 320 for compensating deterioration according to the accumulated driving time, And a compensation gain correcting unit 330 for correcting the deterioration compensation gain and the target compensation gain according to the use environment.

The deterioration compensating unit 310 compensates for the deterioration of the organic light emitting diode OLED according to the voltage variation? Vsen of the driving voltage for driving the organic light emitting diode OLED shown in FIG. Information on the characteristic of the compensation curve indicating the relationship of the values can be used.

The information on the characteristic of the compensation curve may be stored in advance in the memory unit 230 in the form of a lookup table or the like as predetermined information. The deterioration compensator 310 measures the voltage change? Vsen through the reference voltage line RVL and substitutes the compensation curve stored in the lookup table to obtain the deterioration compensation gain corresponding to the voltage change? Vsen Can be obtained.

The degradation compensation gains according to the characteristic of the compensation curve stored in the lookup table can be referred to as deterioration compensation data. At this time, a deterioration compensation period for the compensation unit 220 to perform deterioration compensation may be preset in the memory unit 230 and stored together. Here, the deterioration compensation period can be variously set, and in some cases, the deterioration compensation period can be varied.

On the other hand, the target compensating unit 320 can use the information about the characteristic of the target curve that indicates the relationship between the cumulative driving time and the luminance decreasing rate shown in (b) of FIG.

As described above, when the organic light emitting diode display 100 is driven for a long time, the organic light emitting diode OLED of each sub pixel is degraded due to driving stress. As the deterioration of the organic light emitting diode OLED increases, the threshold voltage to be sensed increases and the output luminance decreases.

If excessive luminance compensation is performed at this time, deterioration proceeds more quickly, resulting in shortening the lifespan of the organic light emitting diode (OLED).

The target curves can be used to prevent such excessive luminance compensation.

The information on the characteristic of the target curve can be stored in advance in the memory unit 230 in the form of a lookup table or the like as preset information in the same manner as the compensation curve.

The target compensating unit 320 may measure the cumulative driving time of the display panel 110 and substitute the target curve stored in the lookup table to obtain the target compensation gain corresponding to the cumulative driving time.

The degradation compensation gains according to the characteristics of the target curve stored in the lookup table can be referred to as target compensation data. At this time, the cumulative driving time at which the compensating unit 220 performs the target compensation may be preset and stored together with the target compensation period in the memory unit 230.

The compensation gain correction unit 330 may correct the deterioration compensation gain obtained in the deterioration compensation unit 310 or the target compensation gain obtained in the target compensation unit 320 according to the use environment.

Here, the compensation gain correction unit 330 may determine the usage environment for the display panel from at least one of the cumulative driving time, the sensing data, and the user command com. For example, the compensation gain correction unit 330 may compare the deterioration compensation period with the command reception timing at which the deterioration compensation command applied to the user command com is received to determine the use environment.

As described above, the deterioration compensation period is a value previously stored in the memory unit 230 and is a preset value. The deterioration compensation period is set to a time interval determined to be necessary for the deterioration compensation under the condition that it is considered as a general use environment of the organic light emitting diode display 100.

Here, the usage environment may include various factors such as a cumulative driving time, a high luminance image, or a specific color image output weight. However, the present invention means all factors that may affect the deterioration of the organic light emitting diode (OLED) or the driving transistor (DRT). That is, the use environment in the present invention can be represented by the degree of deterioration.

Therefore, if the command receiving time at which the deterioration compensation command for instructing the user to perform the deterioration compensation is received is earlier than the predetermined deterioration compensation period, the compensation gain correction unit 330 determines that the current time It can be judged that the use environment is an environment in which deterioration is generated more rapidly. That is, it can be determined that the OLED display 100 is used in a hard environment.

On the contrary, when the command reception time is later than the deterioration compensation period, the compensation gain correction unit 330 can determine that the current use environment is a light use environment.

Meanwhile, the compensation gain correction unit 330 determines the use environment by using the target compensation gain obtained by the target compensation unit 320 according to the deterioration compensation gain and the cumulative driving time obtained in the deterioration compensation unit 310 according to the sensing data You may.

In some cases, the compensation gain correction unit 330 can determine the use environment from the characteristics of the target compensation gain and the degradation compensation gain.

As shown in Fig. 4B, the target curve is a curve showing the ideal luminance reduction rate with respect to the driving time. Therefore, only the driving time (cumulative driving time) affects the luminance reduction rate in the target curve. However, since the deterioration compensation gain is a gain for compensating the deterioration of the organic light emitting diode (OLED), it represents the degree of deterioration of the actual organic light emitting diode (OLED). Therefore, if the target compensation gain is larger than the degradation compensation gain, it can be determined as a hard use environment. On the other hand, if the target compensation gain is smaller than the degradation compensation gain, it can be discriminated as a written use environment.

The compensation gain correction unit 330 corrects the deterioration compensation gain obtained in the deterioration compensation unit 310 or the target compensation gain obtained in the target compensation unit 320 according to the discriminated usage environment, The image quality and lifetime of the organic light emitting display panel can be improved by compensating the organic light emitting diode (LED) using the target compensation gain.

Fig. 5 shows an example of degradation compensation according to the characteristics of the target curve.

FIG. 5A shows a case where pixels of the display panel 110 are driven in black color, and FIG. 5B shows a case of driving in a high-luminance color.

Since the target curve is a curve representing the luminance reduction rate with respect to the driving time, only the driving time (cumulative driving time) affects the actual luminance reduction rate. That is, the target curve can not reflect the use environment of the OLED display 100 except for the time.

5 (a), the display panel 110, which performs the deterioration compensation according to the target curve, is unnecessarily caused by the target curve even though the pixel of the display panel 110 is driven in black color and no actual deterioration occurs The luminance rising width is limited. That is, the brightness of the display panel 110 is unnecessarily reduced.

In contrast, in (b) of FIG. 5, the pixels of the display panel 110 are driven by a high-luminance color, and deterioration is rapidly generated, but they remain in the target curve. As a result, when the deterioration compensation is performed based on the target curve, the over compensation is performed, and the deterioration proceeds rapidly. That is, the image quality and lifetime of the organic light emitting display panel are reduced.

On the other hand, if the compensation gain correction unit 330 corrects the deterioration compensation gain and the target compensation gain according to the use environment and compensates the organic light emitting diode (LED) using the corrected deterioration compensation gain and the target compensation gain, And one and the compensation can be reduced, so that the image quality and life of the organic light emitting display panel can be improved.

6 illustrates a method of driving an OLED display according to an embodiment of the present invention.

Referring to FIG. 3, a driving method of the OLED display of FIG. 6 will be described. First, power is supplied to the display panel 110 (S610). When the display panel 110 is driven to display an image, deterioration of the organic light emitting diode OLED proceeds (S615).

Then, the compensation gain correction unit 330 determines whether a deterioration compensation command as a user command is received (S620). If the deterioration compensation command is received, the deterioration compensating unit 310 receives the sensing data from the sensing unit 210 and senses deterioration of the organic light emitting diode (LED) (S625). In step S630, a deterioration compensation gain for performing deterioration compensation for the at least one subpixel is obtained according to the degree of deterioration sensed.

Meanwhile, the target compensator 320 determines whether the target compensation period is irrespective of whether a deterioration compensation command is received (S635). If it is determined that the target compensation period is the target compensation period, the target compensation unit 320 obtains the target compensation gain according to the cumulative driving time of the display panel 110 (S640).

Then, the compensation gain correction unit 330 compares the command reception time at which the deterioration compensation command is received and the predetermined deterioration compensation period to perform the deterioration compensation, thereby determining the use environment.

Then, a weight for correcting the deterioration compensation gain and the target compensation gain is obtained according to the discriminated use environment (S650).

In this case, the first degradation weight α and the first target weight β corresponding to the deterioration compensation gain and the target compensation gain, respectively, can be obtained as the weights according to the reception timing of the command. The first deterioration weight α and the first target weight β with respect to the reception timing of the command can be obtained by calculating the value corresponding to the command reception timing at the compensation gain correction unit 330, Lt; / RTI >

Also, the compensation gain correction unit 330 calculates a second degradation weight γ and a second target weight δ corresponding to the deterioration compensation gain and the target compensation gain, respectively, according to the time difference between the previous command reception time and the current command reception time Can be obtained.

The second degradation weight γ and the second target weight δ may also be obtained by calculating a value corresponding to the time difference between the compensation gain correction unit 330 and the command reception time, .

7 shows an example of a weight look-up table.

7 (a) shows an example of a lookup table for the first deterioration weight? And the first target weight? According to the command reception timing. the first deterioration weight α and the first target weight β increase as the time at which the command is received becomes faster as the first deterioration weight α and the first target weight β increase, Is set so that the first deterioration weight alpha and the first target weight beta decrease as the time of the first deterioration weight alpha and the first target weight alpha decrease. This is because it can be determined that the higher the command receiving time, the greater the degree of deterioration.

In (a), the first deterioration weight α and the first target weight β are both 1 in a period from 1500 h to 2000 h.

The first deterioration weight alpha and the first target weight beta are multiplied by the deterioration compensation gain and the target compensation gain, respectively. When the deterioration compensation gain and the target compensation gain are 1, the deterioration compensation gain and the target compensation gain are not changed. This is because the time of command reception is similar to the degradation compensation period.

If the command reception time is earlier than the deterioration compensation period and the time difference between the command reception time and the previous command reception time is within a predetermined reference time difference (100h in FIG. 7 (b)), State, it is possible to further obtain the second deterioration weight? And the second target weight?.

Then, the compensation gain correction unit 330 can correct the deterioration compensation gain using the first deterioration weight? And the second deterioration weight? To acquire the correction deterioration compensation gain (S655). Similarly, the compensation gain correction unit 330 may correct the target compensation gain using the first target weight? (Second target weight?) And obtain the correction target compensation gain

For example, the compensation gain correction unit 330 may obtain the correction deterioration compensation gain by multiplying the deterioration compensation gain by the first deterioration weight alpha and the second deterioration weight y. Also, the correction target compensation gain may be obtained by multiplying the target compensation gain by the first target weight [beta] second target weight [delta].

The compensation gain correction unit 330 compensates the degradation of the at least one sub-pixel using the correction target compensation gain and the correction deterioration compensation gain (S660).

8 is a diagram schematically showing the concepts of the correction deterioration compensation gain and the correction target compensation gain. 8, the correction deterioration compensation gain and the correction target compensation gain obtained by the compensation gain correction unit 330 may have an effect similar to that of changing the compensation curve and the target curve according to the use environment. That is, degradation compensation of the organic light emitting diode (OLED) suitable for the use environment can be performed.

 9 illustrates a method of driving an OLED display according to another embodiment of the present invention.

In Fig. 9, power is first supplied to drive the display panel 110 (S910). When the display panel 110 is driven to display an image, deterioration of the organic light emitting diode OLED proceeds (S915).

However, in FIG. 9, the compensation gain correction unit 330 determines whether the accumulated driving time is equal to or longer than the reference setting period without discriminating the use environment separately (S920). If the driving time is longer than the reference setting period, the target compensating unit 320 obtains the target compensation gain according to the cumulative driving time of the display panel 110 (S925). Then, the compensation gain correction unit 330 determines whether it is a predetermined luminance compensation period (TC + DC) (S930). If it is determined that the luminance compensation period is not the luminance compensation period (TC + DC), the compensation gain correction unit 330 determines that the target compensation period is TC, and performs deterioration compensation using the obtained target compensation gain (940) .

However, if it is determined that the brightness compensation period is included, the deterioration compensating unit 310 receives the sensing data from the sensing unit 210 and senses deterioration of the organic light emitting diode (LED) (S940). The deterioration compensation gain for performing deterioration compensation for the at least one subpixel is obtained according to the sensed degree of deterioration (S945).

The compensation gain correction unit 330 obtains the luminance compensation gain by merging the target compensation gain and the deterioration compensation gain obtained in the luminance compensation period (S950). Then, deterioration compensation is performed using the obtained luminance compensation gain (955).

Here, the luminance compensation gain is a value obtained by combining the target compensation gain and the deterioration compensation gain. Unlike the target compensation gain, in which only the cumulative driving time is reflected, compensation of a suitable organic light emitting diode (LED) by the use environment can be performed. The luminance compensation gain may be calculated as the sum of the target compensation gain and the degradation compensation gain, but may be obtained in other manners.

Also, the compensation gain correction unit 330 may perform degradation compensation using the target compensation gain again after the luminance compensation period, but may also compensate the organic light emitting diode (LED) using the obtained luminance compensation gain have.

The luminance compensation period can be alternated periodically or aperiodically.

10 and 11 illustrate a case where the target compensation period and the luminance compensation period are alternately displayed according to the driving method of the OLED display of FIG.

10 shows a case where the luminance compensation gain is higher than the target compensation gain by the deterioration compensation gain. This is a case where the deterioration of the actual organic light emitting diode (LED) is less than the target compensation gain, which is a light use environment. Since the luminance compensation gain is higher than the target compensation gain, unnecessary luminance reduction can be prevented.

11 shows a case where the luminance compensation gain is lower than the target compensation gain. This is the case where more deterioration of the organic light emitting diode (LED) occurs more than the target compensation gain, which indicates the hard use environment. When over compensation is performed in a hard use environment, deterioration of an organic light emitting diode (LED), which has already undergone deterioration, may be more rapidly generated. However, as shown in FIG. 11, the present invention can compensate the organic light emitting diode (LED) by lowering the luminance compensation gain to a target compensation gain, thereby improving the lifetime of the OLED display.

On the other hand, as shown in FIGS. 10A and 11A, the compensation gain correction unit 330 performs compensation for the organic light emitting diode (LED) according to the target compensation gain after the luminance compensation period Can be controlled.

When the compensation gain correction unit 330 compensates for the organic light emitting diode (LED) according to the target compensation gain after the luminance compensation period, as shown in FIG. 10 (a), the deterioration is less than the deterioration degree according to the target curve In the progressive display panel, the luminance of the emitted light is lowered, while the lifetime of the organic light emitting diode (LED) may be longer.

As shown in FIGS. 10B and 11B, the obtained luminance compensation gain is maintained until the next luminance compensation period, and compensation for the organic light emitting diode (LED) is performed according to the luminance compensation gain continuously .

When the compensated gain correction unit 330 maintains the acquired luminance compensation gain after the luminance compensation period, the luminance is lowered unnecessarily in the display panel in which deterioration is less than the degree of deterioration according to the target curve as shown in FIG. 10 (a) It can be used continuously.

In some cases, as shown in FIG. 10C, the compensation gain correction unit may adjust the luminance compensation gain to converge to the target compensation gain until the next luminance compensation period after the luminance compensation period.

In this case, the brightness of the display panel may be lower than the deterioration degree of the target curve, so that the brightness of the display panel may be reduced. It is gradually adjusted to a luminance lower than the current deteriorated state, so that an effect of extending the service life may also occur.

As a result, the OLED display and the driving method thereof according to the embodiments of the present invention can perform adaptive deterioration and residual image compensation according to the use environment.

In addition, the organic light emitting display device and the driving method thereof can suppress the deterioration and the afterimage of the organic light emitting display panel according to the use environment, thereby improving the image quality and lifetime.

In addition, the OLED display and the driving method thereof can provide an image with improved brightness according to the usage environment.

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 diode display 210: sensing unit
110: organic light emitting display panel 220:
120: Data driver 230: Memory part
130: gate driver
140: controller

Claims (13)

A display panel on which a plurality of subpixels are arranged;
A sensing unit for measuring a sensing voltage from the display panel and outputting sensing data for at least one of the plurality of subpixels; And
Acquiring predetermined compensation gain data to perform compensation for the at least one subpixel based on the cumulative driving time of the display panel, and using at least one of the sensing data and the user command, Compensating means for compensating the compensation gain data so as to correspond to the compensation gain data; And an organic light emitting diode (OLED). The method according to claim 1,
The compensation gain data
Degradation compensation data including at least one degradation compensation gain for performing deterioration compensation for the at least one subpixel; And
Target compensation data including a target compensation gain for performing target compensation according to the cumulative driving time; And an organic light emitting diode (OLED). 3. The method of claim 2,
Wherein the compensation unit compares an instruction reception time of the deterioration compensation instruction with a deterioration compensation period that is predetermined to perform the deterioration compensation when the deterioration compensation instruction is received in the user command, . The method of claim 3,
The compensation unit
Wherein the deterioration degree of the at least one subpixel is determined from the sensed data at the command reception time and the deterioration compensation period and a deterioration compensation gain corresponding to the deterioration degree among the deterioration compensation gains included in the deterioration compensation data is A deterioration compensating unit to be obtained;
A target compensation unit for determining the cumulative driving time in a target compensation period predetermined to perform the target compensation and obtaining a target compensation gain corresponding to the cumulative driving time among target compensation gains included in the target compensation data; And
A compensation gain correcting unit for determining the use environment and correcting the deterioration compensation gain and the target compensation gain according to the determined use environment; And an organic light emitting diode (OLED). 5. The method of claim 4,
The compensation gain correction unit
Compensates the deterioration compensation gain and the target compensation gain so as to increase the deterioration compensation gain and the target compensation gain when the command reception time is earlier than the deterioration compensation period, Wherein the first degradation weight and the first target weight are corrected so as to obtain the first degradation weight and the first target weight. 6. The method of claim 5,
The compensation gain correction unit
Calculating a time difference between the command reception time and the previous command reception time when the command reception time is earlier than the degradation compensation period and adding the deterioration compensation gain and the target compensation gain when the calculated time difference is less than the predetermined reference time difference And obtains a second deterioration weight and a second target weight for correction. The method according to claim 6,
The compensation gain correction unit
Wherein the first degradation weight and the first target weight are increased or decreased in accordance with a time difference between the deterioration compensation period and the command reception time,
And increases the second deterioration weight and the second target weight in accordance with a time difference between the command reception time and the previous command reception time. The method according to claim 6,
The compensation gain correction unit
Pixel to obtain a correction deterioration compensation gain for performing deterioration compensation for the at least one subpixel using the deterioration compensation gain, the first deterioration weight and the second deterioration weight,
A target compensation gain for performing target compensation for the at least one subpixel using the target compensation gain, the first target weight, and the second target weight to compensate degradation of the at least one subpixel To the organic light emitting display device. 3. The method of claim 2,
The compensation unit
A target compensation unit for obtaining a target compensation gain of the target compensation data according to the cumulative driving time;
A deterioration compensator for discriminating the degree of deterioration of the at least one subpixel from the sensing data and obtaining a deterioration compensation gain corresponding to the deterioration degree among deterioration compensation gains included in the deterioration compensation data; And
Compensates the deterioration of the at least one subpixel according to the target compensation gain, obtains a luminance compensation gain by merging the degradation compensation gain and the target compensation gain for at least one predetermined luminance compensation period, A compensation gain correcting unit for compensating for the luminance and the deterioration of the at least one sub-pixel according to the compensation gain; And an organic light emitting diode (OLED). 10. The method of claim 9,
The compensation gain correction unit
And compensates degradation of the at least one subpixel according to the target compensation gain after the luminance compensation period. 10. The method of claim 9,
The compensation gain correction unit
And adjusts the luminance compensation gain to converge to the target compensation gain until the next luminance compensation period after the luminance compensation period. 10. The method of claim 9,
The compensation gain correction unit
Wherein the luminance compensation gain obtained until the next luminance compensation period is maintained after the luminance compensation period. A sensing unit for measuring a sensing voltage from the display panel and outputting sensing data for at least one subpixel of the plurality of subpixels and a compensation unit for driving the organic light emitting display In the method,
Acquiring predetermined compensation gain data to perform compensation for the at least one subpixel based on the cumulative driving time of the display panel;
Correcting the compensation gain data to correspond to a use environment of the display panel using at least one of the sensing data and the user command; And a driving method of the organic light emitting display device.

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