KR20180132306A - Conroller, organic light emitting display device and method for compensating degradation thereof - Google Patents

Abstract

The present invention relates to a control part, and an organic light emitting display apparatus and a deterioration compensation method using the same. The control part comprises: a deterioration compensation part which receives deterioration information and creates compensation data by using deterioration information when a deterioration state of at least one pixel among a plurality of pixels is determined to reach a compensation limit point in the deterioration information; and a signal compensation part which creates output data by applying a deterioration compensation algorithm to input data, wherein the deterioration compensation algorithm uses compensation data.

Description

TECHNICAL FIELD [0001] The present invention relates to a control unit, an organic light emitting diode (OLED) display using the same, and a degradation compensation method using the same.

The embodiments relate to a control unit, an organic light emitting display using the same, and a deterioration compensation method.

BACKGROUND ART Demands for a display device for displaying an image have been increasing in various forms as an information society has developed. In addition, a liquid crystal display device (LCD), a plasma display device (Plasma Display Device) OLED (Organic Light Emitting Diode Device), and the like.

Among the above display devices, organic light emitting display devices have been recently spotlighted because they use organic light emitting diodes which are self-light emitting devices and have excellent response speed, viewing angle, color reproducibility, and are thin and spherical.

However, the organic light emitting display includes an organic light emitting diode that emits light by a driving current for each pixel and a pixel circuit that supplies a driving current to the organic light emitting diode. The organic light emitting diode is deteriorated due to use time, There is a problem that the uniformity is deteriorated.

Therefore, it is necessary to compensate the deterioration of the organic light emitting diode, thereby ensuring the uniformity of the image, and preventing the deterioration of image quality.

It is an object of the present embodiments to provide a control unit for preventing degradation of image quality uniformity, an organic light emitting display using the same, and a deterioration compensation method.

According to one aspect of the present invention, there is provided a display panel including a plurality of pixels, a control unit for generating output data by applying a deterioration compensation algorithm to input data, a deterioration compensation algorithm using compensation data, A driving IC for generating a signal and transmitting the deterioration information to the display panel, and when deterioration information includes a deterioration state of at least one pixel of the plurality of pixels having reached a compensation limit point, And a deterioration compensation unit for generating data.

According to another aspect of the present invention, there is provided a display panel including a plurality of pixels, a control unit for generating output data by applying a deterioration compensation algorithm to input data, a deterioration compensation algorithm using compensation data, A driver IC for generating a data signal and transferring the data signal to a display panel, and a driver IC for generating a gain of at least one first pixel corresponding to a first region of the plurality of pixels at a first time and at least one second pixel And a deterioration compensating unit for stopping generation of new compensation data when the difference between the gains of the first and second compensation units is equal to or greater than a preset magnitude.

In another aspect, the embodiments of the present invention receive degradation information and generate compensation data using the previous degradation information when it is determined that the deterioration state of at least one pixel among the plurality of pixels reaches the compensation limit point And a signal compensation unit for generating output data by applying a deterioration compensation algorithm to the input data, wherein the deterioration compensation algorithm uses the compensation data.

According to another aspect of the present invention, there is provided a method of compensating for a noise, comprising the steps of sensing deterioration of a plurality of pixels, calculating a gain using deterioration information obtained by sensing deterioration, outputting compensation data using a gain, And outputting the previous compensation data if the difference between the first pixel and the second pixel with respect to the first pixel is equal to or greater than a predetermined magnitude.

According to the embodiments, it is possible to provide a control unit for preventing the uniformity of image quality from being degraded, an organic light emitting display using the same, and a deterioration compensation method.

1 is a structural view illustrating an organic light emitting diode display according to an embodiment of the present invention.
2 is a circuit diagram showing an embodiment of a pixel employed in the display panel shown in Fig.
3 is a conceptual diagram showing an embodiment of a first area and a second area of the display panel shown in FIG.
4 is a graph showing a rate of change in luminance in the first region and the second region shown in FIG.
5 is a graph showing the relationship between the amount of current and the gain of the first region and the second region of the display panel shown in Fig.
6 is a structural diagram showing a first embodiment of the deterioration compensation unit shown in FIG.
7 is a structural diagram showing a second embodiment of the deterioration compensator shown in Fig.
8 is a structural diagram showing an embodiment of a control unit according to the present invention.
9 is a flowchart showing a deterioration compensation method 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 structural view illustrating an organic light emitting diode display according to an embodiment of the present invention.

Referring to FIG. 1, the OLED display 100 may include a display panel 110, a controller 120, a driver IC 130, and a deterioration compensator.

The display panel 110 may be arranged in a region where a plurality of pixels 101 intersect a plurality of gate lines S1 to Sn and a plurality of data lines D1 to Dm. Each pixel 101 may include an organic light emitting diode (OLED) and a pixel circuit (not shown) for supplying a driving current to the organic light emitting diode. The pixel circuit receives a data signal flowing through the data line in response to a gate signal transmitted through the gate line, and generates a driving current to supply the driving current to the organic light emitting diode. In addition, the pixel circuit may be connected to a separate power line (not shown) to receive a driving current. However, the present invention is not limited thereto.

The control unit 120 may generate output data by applying a degradation compensation algorithm to the input data. The input data may be an RGB signal input from an external device (not shown), and the output data may be an RGB signal deteriorated by compensation data. The RGB signal may be a signal including information on the red, blue, and green signals, and may be a digital signal. The degradation compensation algorithm can output the input data as deteriorated compensated output data (Output data) using the compensation data (Vdata). In addition, the control unit 120 can control the driver IC 130.

The driver IC 130 receives the output data from the controller 120, generates the data signal, and transmits the data signal to the display panel 110. In addition, the driver IC 130 may further include a separate driver IC for driving the gate line. Here, the number of the driver ICs 130 is shown to be four, but the present invention is not limited thereto, and the number of the driver ICs 130 may be adjusted according to the size and resolution of the display panel 110. The driver IC 130 may be connected to the data lines D1, ..., Dm of the display panel 110. [ In addition, a GIP (Gate In Panel) circuit may be disposed on the left and / or right of the display panel and connected to the drive IC driving the gate line.

The deterioration compensation unit 140 generates compensation data Vdata and transmits the compensation data Vdata to the control unit 120 so that the compensation data Vdata is used when the deterioration compensation algorithm is applied to the input data in the control unit 120 . The compensation data Vdata is used to convert the input data to output data and the compensation data Vdata is set to the initial compensation data and the deterioration compensation unit 140 uses the initial compensation data Vdata, The compensation data Vdata can be generated. The gain may correspond to a value obtained by dividing the initial luminance value by the current luminance value. In addition, the luminance value may correspond to the driving current flowing in the organic light emitting diode OLED.

The deterioration compensating unit 140 can generate the compensation data (Vdata) by using the previous deterioration information if it is determined that the deterioration state of at least one of the plurality of pixels has reached the compensation limit point in the deterioration information. If at least one pixel that has reached the compensation limit of the plurality of pixels and at least one pixel that does not reach the compensation limit is reached, the pixel that reaches the compensation limit is not compensated even if the compensation algorithm is applied, but the compensation limit is not reached There is a problem that the luminance deviation between the pixel that has reached the compensation limit point and the pixel that does not reach the compensation limit point becomes large. In order to solve such a problem, the deterioration compensating unit 140 determines whether there is a pixel that has reached the compensation limit point, and compensates the compensating data by using the previous degradation information . The previous deterioration information may be the deterioration information sensed when one of the plurality of pixels of the display panel does not reach the compensation limit point.

Also, the deterioration compensating section 140 compensates for the difference between the gain of at least one first pixel corresponding to the first region of the plurality of pixels and the gain of at least one second pixel corresponding to the second region at the first time, If it is larger than the set size, generation of new compensation data can be stopped. When the generation of the new compensation data is stopped, the deterioration compensating unit 140 may transmit the compensation data 140 generated before the deterioration compensating unit 140 to the control unit 120. [ However, the present invention is not limited thereto.

The deterioration compensating unit 140 may be connected to the display panel 110 through the sensing lines SS1 through SSn and may receive the organic light emitting diodes OLED through the sensing lines SS1 through SSn, have. Here, the degradation compensation unit 140 is shown as one block, but it is not limited thereto.

2 is a circuit diagram showing an embodiment of a pixel employed in the display panel shown in Fig.

Referring to FIG. 2, the pixel 211 may include an organic light emitting diode (OLED), first through third transistors T1 through T3, and a capacitor C1. Here, the first transistor T1 may be a driving transistor for driving a driving current to the organic light emitting diode OLED.

The first transistor T1 has a first electrode connected to the power supply line VL and receiving a high potential EVDD and a second electrode connected to the second node N2. Lt; / RTI > The second transistor T2 may have a first electrode connected to the data line DL, a second electrode connected to the first node N1, and a gate electrode connected to the gate line GL. The third transistor T3 may have a first electrode connected to the second node N2, a second electrode connected to the sensing line SSL and a third electrode connected to the sensing control signal line SEL. Here, the sensing control signal line SEL may be a gate line GL. Also, the capacitor C1 may be connected between the first node N1 and the second node N2. The DAC 721 and the ADC 722 can be connected to the data line DL and the sensing line SSL connected to the pixels and the second switch 722 can be connected between the sensing line SSL and the ADC 722, (SW2) can be connected.

When the initialization signal is transmitted through the data line DL in the state that the gate signal is transmitted through the gate line GL, the pixel 711 operates in the initialization mode to initialize the voltage stored in the capacitor C1 . When the initialization mode is terminated while the gate signal is maintained through the gate line GL and the data signal is transmitted to the first node N1 through the data line DL, the pixel can be delivered when the pixel operates in the display mode. In the initialization mode and the display mode, the second switch SW2 can be kept off. When the gate signal is switched from the on state to the off state through the gate line GL and the first switch SW1 is turned on and then turned off, the pixel 711 operates in the sensing mode, The threshold voltage of the first transistor T1 and the characteristics of the electron mobility can be transmitted to the ADC 722 connected to the sensing line. Here, the ADC 222 and the second switch SW2 may be part of the deterioration compensator 140 shown in FIG. However, the present invention is not limited thereto and may be a part of the drive IC 130.

The organic light emitting diode OLED included in the pixel 211 may be deteriorated according to the light emission time. In addition, the organic light emitting diode (OLED) may have a higher degree of deterioration when a constant current flows. Since the sensing line is connected to the first node N1 through the third transistor T3, it is possible to determine the deterioration of the organic light emitting diode OLED by sensing the voltage applied to the first node N1. Also, the deterioration of the organic light emitting diode OLED can be determined by sensing the current flowing from the first node N1 to the cathode electrode of the organic light emitting diode OLED. A voltage between the cathode electrode of the organic light emitting diode OLED at the first node N1 may be referred to as a driving voltage. In addition, a current flowing from the first node N1 to the cathode electrode of the organic light emitting diode OLED can be referred to as a driving current.

3 is a conceptual diagram showing an embodiment of a first area and a second area of the display panel shown in FIG.

Referring to FIG. 3, the display panel 310 may be divided into a first area 311 and a second area 312. The first area 311 may be a general image display area and the second area 312 may be a still image display area. A general image may be a video image such as a moving image, and a still image may be a video image that does not change the screen. Also, the second area 312 may be a still image superimposed on a moving image. The still image may be a broadcasting station logo, a logo of a display panel manufacturer, and the like. However, the present invention is not limited thereto. A plurality of pixels shown in FIG. 2 may be disposed in the first area 311 and the second area 312. [ Also, at least one pixel disposed in the first region 311 may be referred to as a first pixel, and at least one pixel disposed in the second region 312 may be referred to as a second pixel.

Here, the second area 312 is shown at one corner of the display panel 310, but the second area 312 is not limited thereto, and the shape and size of the second area 312 may correspond to the number and size of still images.

FIG. 4 is a graph showing a rate of change in luminance according to deterioration compensation in the first region and the second region shown in FIG.

Referring to FIG. 4, the organic light emitting diode OLED deteriorates with time. Since the pixels corresponding to the first region are switched, currents of various sizes flow. However, in the case of a still image, Can flow. Thus, the deterioration occurring in the second region 312 may be larger than the deterioration occurring in the first region 311. Thus, the luminance of the second pixel corresponding to the second region 312 can be lowered more easily than the luminance of the first pixel corresponding to the first region 311. Therefore, the slope corresponding to the luminance change of the second pixel may be larger than the slope of the luminance change of the first pixel.

As the use time of the display panel 310 increases, the pixels disposed on the display panel 310 may be degraded. The luminance change gradient of the second pixel is larger than the luminance change gradient of the first pixel, so that the degradation degree of the second pixel may become larger than the degradation degree of the first pixel when the same time elapses. In addition, the degree of deterioration of the first pixel and the second pixel may be greater at the second compensation time than at the first compensation time, than at the first pixel and the second pixel. And, as the time passes, the degree of deterioration may become larger.

In addition, if the degree of deterioration of the second pixel becomes very severe after the third compensation time has elapsed and reaches the compensation limit point, the compensation of the first pixel compensates for the fourth compensation time so that the luminance of the first pixel is compensated for, So that the luminance can not be increased. Accordingly, when the fourth compensation time elapses, the first pixel is compensated to increase the luminance again, but the second pixel can not be compensated and the luminance may not increase. Therefore, even if the deterioration compensation is performed to increase the uniformity of the image quality of the display panel 310, the luminance of the first pixel and the luminance of the second pixel can be greatly increased. Therefore, even if the deterioration compensation is performed, there arises a problem that the luminance deviation in the display panel 310 becomes larger.

In order to solve such a problem, the present invention can prevent the degradation compensation from being performed when the compensation limit point is reached. Not performing degradation compensation may be using existing compensation data.

5 is a graph showing the relationship between the amount of current and the gain of the first region and the second region of the display panel shown in Fig.

Referring to FIG. 5, information on the characteristics of the compensation curve and the voltage change (? Vsen) can be used to compensate for the deterioration. Information on the characteristics of the compensation curve is predetermined information and can be stored in a lookup table or the like. Then, by measuring the voltage change (? Vsen) and assigning it to the compensation curve stored in the look-up table, a gain can be obtained.

The gain can be obtained by the following equation (1).

는 현재 온도에서 기준전압과 측정전압 차이에 대응되는 값이고, a,b,c는 기설정된 상수이다. Here, g is a gain,

Is a value corresponding to the difference between the reference voltage and the measured voltage at the present temperature, and a, b, and c are predetermined constants.

에 대응하는 게인이 저장되어 있도록 하여

가 측정되면 룩업테이블에 의해 게인값을 알 수 있게 할 수 있다. 또한, 룩업테이블에는 보상곡선의 특성이 저장되어

가 측정되면 룩업테이블에 의해 게인값을 알 수 있게 할 수 있다. 상기의 수학식 1에는 게인이 온도에 대응하여 산출되는 것으로 나타나 있지만, 이에 한정되는 것은 아니고 온도는 무시하고 게인을 산출하는 것도 가능하다. Then, in the lookup table

So that the gain corresponding to

The gain value can be known by the look-up table. In addition, the look-up table stores the characteristic of the compensation curve

The gain value can be known by the look-up table. Although the above equation (1) shows that the gain is calculated corresponding to the temperature, the present invention is not limited to this, and it is also possible to calculate the gain while ignoring the temperature.

And, the gain may be a ratio of the reference luminance to the measured luminance for the pixel. If the difference [Delta] g between the gains of the first pixel and the second pixel measured by Equation (1) is equal to or greater than a preset value, the second pixel can determine that the deteriorated state has reached the compensation limit.

Also, the luminance of the first pixel and the luminance of the second pixel can be measured, and the gain of the first pixel and the gain of the second pixel can be measured respectively by comparing with the reference luminance, and the gain difference can be grasped by using the measured gain. Here, the measurement of the luminance may correspond to the current value flowing in the first pixel and the second pixel, so that the gain of the first pixel and the gain of the second pixel are measured by comparing and measuring the driving current rules flowing through the first pixel and the second pixel can do.

6 is a structural diagram showing a first embodiment of the deterioration compensation unit shown in FIG.

Referring to FIG. 6, the deterioration compensating unit 640 includes a first sensing unit 641 for sensing a driving voltage applied to each of a plurality of pixels, a first sensing unit 641 for sensing a voltage change corresponding to a difference between the reference voltage Vref and the driving voltage, A second calculation unit 644 for calculating a gain corresponding to the voltage change value, and a second calculation unit 644 for determining that the compensation limit point has been reached when the difference between the gains of at least one pixel and the other pixels is equal to or larger than a predetermined size And a compensation data calculation unit 645 for generating compensation data (Vdata) using the previous deterioration information.

The first sensing unit 641 may be connected to the sensing line SSL to receive a driving voltage. Then, the received driving voltage can be sensed and transmitted to the first calculation unit 643. The first operation unit 643 generates a voltage change ΔVsen using the received reference voltage Vref and the drive voltage and transmits the voltage change ΔVsen to the second operation unit 644 so that the second operation unit 644 generates a voltage change ΔVsen The gain g can be calculated. The second calculation unit 644 can calculate the gain g using the look-up table (LUT). The gain corresponding to the voltage change (? Vsen) can be stored in the look-up table and the gain can be calculated by measuring the voltage change (? Vsen).

Also, the compensation data calculator 645 compares gains of at least one pixel with other pixels, and if the difference is smaller than the preset size, it is determined that the pixels do not reach the compensation limit and the calculated gains are applied It is possible to generate the compensation data Vdata. However, if the gain of at least one pixel is compared with the gain of another pixel, at least one pixel can be determined to have reached the compensation limit if the difference is larger than a predetermined size. If it is determined that at least one pixel has reached the compensation limit point, the compensation data calculation section 645 can output the compensation data calculated previously. At least one pixel corresponds to the second pixel in Fig. 5 and the other pixel corresponds to the first pixel in Fig.

More specifically, the compensation data calculator 645 compares the gain (g) of the first pixel with the second pixel at the compensation time, and if the difference is smaller than the preset value, there is no pixel that reaches the compensation limit . However, the compensation data calculator 645 can determine that there is a pixel that has reached the compensation limit if the difference is greater than a predetermined value. If the compensation time without a pixel reaching the compensation limit point is referred to as a first time and the compensation time at which a pixel that has reached the compensation limit point is referred to as a second time, Data (Vdata) can be generated. However, in the second time, the compensation data (Vdata) can be generated by using the gain (g) calculated at the first time. That is, the deterioration compensating unit 640 can generate the compensation data (Vdata) by using the previous deterioration information, and when the compensation limit point is reached, the deterioration compensating unit 640 may not compensate for further deterioration.

The deterioration compensating unit 640 may further include a second sensing unit 642 for sensing temperature and generating temperature information. In the case where the deterioration compensating unit 642 further includes the second sensing unit 642, the second calculating unit 643 can calculate the gain g corresponding to the temperature information as well as the voltage change? Vsen.

7 is a structural diagram showing a second embodiment of the deterioration compensator shown in Fig.

7, the deterioration compensating unit 740 includes a sensing unit 741 that senses the luminance of the first pixel and the luminance of the second pixel, and a deterioration compensating unit 740 that compares the reference luminance Vref with the luminance of the first pixel, An operation unit 742 for calculating the gain of one pixel and calculating the gain of the second pixel corresponding to the ratio of the reference luminance Iref and the luminance of the second pixel, And a compensation data calculation unit 743 for stopping generation of new compensation data when the difference in gain is equal to or larger than a predetermined size.

The sensing unit 741 may be connected to the sensing line SSL to receive a driving current. Then, the received drive current can be sensed to calculate the brightness value and transmitted to the operation unit 742. The operation unit 742 may compute the gain g corresponding to the first pixel and the second pixel by comparing the received luminance value and the reference luminance, and may transmit the gain g to the compensation data calculation unit 743. [ The compensation data calculator 743 may calculate the compensation data Vdata using the gain g corresponding to the first pixel and the second pixel. At this time, if the difference between the gains (g) corresponding to the first pixel and the second pixel is smaller than the predetermined size, the compensation data calculator 743 can calculate the compensation data using the calculated gain. However, if the difference between the gains (g) corresponding to the first pixel and the second pixel is larger than a predetermined size, generation of new compensation data can be stopped. When the generation of the new compensation data is stopped, the compensation data generated before that can be output.

8 is a structural diagram showing an embodiment of a control unit according to the present invention.

Referring to FIG. 8, the controller 820 may output the output data by compensating the input data. For this, the controller 820 may include a deterioration compensating unit 820a and a signal compensating unit 820b.

The deterioration compensating section 820a can generate compensation data. The deterioration compensating unit 820a receives the deterioration information and can generate the compensation data using the deterioration information if the deterioration information includes the deterioration state of at least one of the pixels having reached the compensation limit point . Also, the deterioration compensating unit 820a may be configured as the deterioration compensating unit shown in FIG. 6 or 7.

The signal compensating unit 820b may apply the compensation algorithm to the input data to generate output data. The compensation algorithm may use the compensation data when generating the output data.

9 is a flowchart showing a deterioration compensation method according to the present invention.

Referring to FIG. 9, the deterioration compensation method can sense the deteriorated state. (S900) The deterioration may mean that the luminance of the organic light emitting diode OLED in the pixel shown in FIG. 2 is lowered. When the organic light emitting diode OLED is deteriorated, the driving voltage applied between the anode electrode and the cathode electrode of the organic light emitting diode OLED may be lower than the reference voltage. Also, when the organic light emitting diode OLED is deteriorated, the amount of the driving current flowing from the anode electrode to the cathode electrode of the organic light emitting diode OLED may be lower than the reference current amount. The deterioration may be caused by applying a data signal to cause the display panel to have a predetermined luminance and measuring the voltage applied between the anode electrode and the cathode electrode of the organic light emitting diode OLED, And measuring the amount of the driving current flowing to the electrode.

Then, an operation can be performed. (S910) An operation can determine whether at least one pixel on the display panel has reached a compensation limit point. The determination as to whether or not the compensation limit has been reached can be made by comparing the gains of the first pixel and the second pixel. The gain may be a ratio of the reference luminance to the current luminance. A pixel for displaying a moving image or the like to which a screen is switched may be referred to as a first pixel, and a pixel for displaying a still image may be referred to as a second pixel. The second pixel may be a pixel located in a specific region of the display panel. The specific area may be an area where a still image is displayed on the display panel.

Also, the gain for the first pixel and the gain for the second pixel can be calculated using the information about the voltage change calculated by comparing the predetermined reference voltage, the driving voltage applied to the first pixel and the driving voltage applied to the second pixel have. At this time, the gain can be calculated by using a lookup table storing the gain value for the voltage change.

It is also possible to calculate the gain of the first pixel corresponding to the ratio of the reference luminance and the luminance of the first pixel and calculate the gain of the second pixel corresponding to the ratio of the reference luminance and the luminance of the second pixel. In addition, the brightness of the first pixel and the second pixel can be detected by sensing the magnitude of the driving current flowing through the organic light emitting diode (OLED) included in the pixel.

When the difference between the gains of the first pixel and the second pixel reaches a predetermined size, the second pixel can determine that the compensation limit has been reached. The pixel reaches a state in which the luminance is not restored to the reference value even if the degradation compensation is performed when the compensation limit point is reached.

Since the second pixel for displaying the still image progresses more quickly than the first pixel for displaying the moving image or the like to which the screen is switched, even if the second pixel for displaying the still image reaches the compensation limit, Lt; / RTI > At this time, if the compensation is performed, the luminance of the first pixel becomes higher again, but if the degradation compensation is performed because the luminance of the second pixel is not increased, the luminance difference between the first pixel and the second pixel may become larger. Therefore, the deterioration in luminance of the display panel may be further deteriorated by the deterioration compensation.

In order to solve the above problem, when at least one pixel on the display panel reaches the compensation limit point, it is possible to prevent further deterioration compensation.

The deterioration compensation method can calculate the compensation data. (S920) The compensation data calculated can be applied to the compensation algorithm to convert the input data inputted from the outside into the output data and output it. The input data input from the outside may include an RGB signal. In addition, both the input data and the output data may be digital signals.

Then, the output data is transferred to the drive IC so that the data signal is transferred to the display panel, and the display panel displays the image by the data signal compensated by the compensation data. However, when at least one pixel reaches the compensation limit point, the compensation data outputs the compensation data calculated in the previous deterioration compensation period, so that the data signal output from the drive IC is compensated by the previous compensation data to the display panel . This makes it possible to prevent the image quality of the display panel from further lowering.

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
101: pixel
110: Display panel
120:
130: Drive IC

Claims (15)

A display panel including a plurality of pixels;
A deterioration compensation algorithm is applied to the input data to generate output data, the deterioration compensation algorithm including a control unit using compensation data;
A driver IC which receives the output data from the controller and generates a data signal and transmits the data signal to the display panel; And
And a deterioration compensating unit that receives the deterioration information and generates the compensation data using the previous deterioration information if it is determined that the deterioration state of at least one of the plurality of pixels has reached the compensation limit point, Emitting display device.
The method according to claim 1,
The degradation compensation unit
A first sensing unit sensing a driving voltage applied to each of the plurality of pixels, respectively;
A first operation unit for calculating a voltage change corresponding to a difference between the reference voltage and the drive voltage;
A second calculation unit for calculating a gain corresponding to the voltage change value; And
And a compensation data calculation unit for determining that the compensation limit value has been reached and generating the compensation data using the previous degradation information if the difference between the gain of the at least one pixel and another pixel is equal to or greater than a predetermined size, .
The method according to claim 1,
The degradation compensation unit
A first sensing unit sensing a driving voltage applied to each of the plurality of pixels, respectively;
A second sensing unit sensing the temperature and generating temperature information;
A first operation unit for calculating a voltage change corresponding to a difference between the reference voltage and the drive voltage;
A second calculation unit for calculating a gain corresponding to the voltage change value and the temperature information; And
And a compensated data calculation unit for determining that the gain of the at least one pixel and the gain of the other pixel are equal to or greater than a preset magnitude and determining that the gain has reached the compensation limit and generating the compensation data using the previous deterioration information, Display device.
3. The method of claim 2,
Wherein the compensation data calculator calculates the gain at least at a first time and a second time and generates the compensation data by applying the calculated gain when the difference of the gains at the second time is smaller than the predetermined size, And generates the compensation data by applying a gain calculated at the first time if the gain difference at the second time is larger than the predetermined size.
A display panel including a plurality of pixels;
A deterioration compensation algorithm is applied to the input data to generate output data, the deterioration compensation algorithm including a control unit using compensation data;
A driver IC which receives the output data from the controller and generates a data signal and transmits the data signal to the display panel; And
When the difference between the gain of at least one first pixel corresponding to the first area of the plurality of pixels and the gain of at least one second pixel corresponding to the second area is equal to or larger than a predetermined size at the first time, And a deterioration compensating unit for stopping the generation of the light emitting diode.
6. The method of claim 5,
The degradation compensation unit
A sensing unit sensing the brightness of the first pixel and the brightness of the second pixel;
An operation section for calculating a gain of the first pixel corresponding to a ratio of a reference luminance and a luminance of the first pixel and calculating a gain of the second pixel corresponding to a ratio of the reference luminance and the luminance of the second pixel; And
And stops the generation of the new compensation data if the difference between the gain of the first pixel and the gain of the second pixel is equal to or greater than a predetermined size.
A deterioration compensating unit that receives compensation information and generates compensation data using the deteriorated information when the deterioration information indicates that the degradation state of at least one of the plurality of pixels has reached the compensation limit; And
Wherein the degradation compensation algorithm comprises a signal compensation unit that uses the compensation data to generate output data by applying a degradation compensation algorithm to the input data.
8. The method of claim 7,
The degradation compensation unit
A first sensing unit sensing a driving voltage applied to each of the plurality of pixels, respectively;
A first operation unit for calculating a voltage change corresponding to a difference between the reference voltage and the drive voltage;
A second calculation unit for calculating a gain corresponding to the voltage change value; And
And a compensation data calculation unit for determining that the compensation limit point has been reached and generating the compensation data using the previous degradation information if the difference between the gain of the at least one pixel and the pixel of the other pixel is equal to or greater than a predetermined size.
8. The method of claim 7,
The degradation compensation unit
A first sensing unit sensing a driving voltage applied to each of the plurality of pixels, respectively;
A second sensing unit sensing the temperature and generating temperature information;
A first operation unit for calculating a voltage change corresponding to a difference between the reference voltage and the drive voltage;
A second calculation unit for calculating a gain corresponding to the voltage change value and the temperature information; And
And a compensation data calculation unit for determining that the compensation limit value has been reached and generating the compensation data using the previous degradation information if the difference between the gain of the at least one pixel and the other pixel is equal to or greater than a predetermined size.
9. The method of claim 8,
Wherein the compensation data calculator calculates the gain at least at a first time and a second time and generates the compensation data by applying the calculated gain when the difference of the gains at the second time is smaller than the predetermined size, And generating the compensation data by applying a gain calculated at the first time if the gain difference at the second time is greater than the predetermined size.
8. The method of claim 7,
Wherein the deterioration compensating unit compensates for a difference between a gain of at least one first pixel corresponding to a first region of the plurality of pixels and a gain of at least one second pixel corresponding to the second region at a first time, The control unit determines that the compensation limit has been reached.
12. The method of claim 11,
The degradation compensation unit
A sensing unit sensing the brightness of the first pixel and the brightness of the second pixel;
An operation section for calculating a gain of the first pixel corresponding to a ratio of a reference luminance and a luminance of the first pixel and calculating a gain of the second pixel corresponding to a ratio of the reference luminance and the luminance of the second pixel; And
And a compensation data calculation unit for stopping the generation of the new compensation data when the difference between the gain of the first pixel and the gain of the second pixel is equal to or larger than a predetermined size.
A method of compensating deterioration of an organic light emitting display device including a display panel including a plurality of pixels,
Sensing deterioration of the plurality of pixels;
Calculating a gain using deterioration information sensing deterioration;
And outputting the compensation data using the gain, and outputting the previous compensation data when the difference between the first pixel and the second pixel with respect to the calculated gain is equal to or greater than a predetermined magnitude.
14. The method of claim 13,
Wherein the gain calculation step calculates the gain using information on a voltage change calculated by comparing a reference voltage and a drive voltage applied to the pixel.
14. The method of claim 13,
Calculating a gain of the first pixel corresponding to a ratio of a reference luminance and a luminance of the first pixel; and calculating a gain of the second pixel based on the ratio of the reference luminance and the luminance of the second pixel, Wherein the gain of the first antenna is calculated.

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