KR20190034854A - Organic light emitting diode display device and operation method thereof - Google Patents

Abstract

The present invention relates to an organic light emitting diode display device capable of reducing the luminance difference between regions wherein the luminance difference occurs when a sensing interval is long when deterioration of an organic light emitting element is sensed by a discrete sensing method to compensate for the deterioration by reflecting deterioration compensation offset according to a sensing time in an area where current deterioration sensing is not performed to compensate for the deterioration.

Description

[0001] The present invention relates to an organic light emitting diode (OLED) display,

More particularly, the present invention relates to an organic light emitting diode (OLED) display and a driving method thereof, and more particularly, To an organic light emitting display and a driving method thereof.

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

Such an organic light emitting display device arranges subpixels including organic light emitting diodes in a matrix form and controls the brightness of subpixels selected by the scan signals according to the gradation of data.

Each of the sub-pixels disposed in the display panel of the organic light emitting display device is basically composed of a driving transistor for driving the organic light emitting diode, a switching transistor for transmitting a data voltage to the gate node of the driving transistor, And a storage capacitor serving as a storage capacitor.

Each of the sub-pixel driving transistors becomes degraded as the driving time becomes longer, and characteristic values such as threshold voltage and mobility can be changed. In addition, since the degree of deterioration may be different for each driving transistor, a characteristic value deviation between driving transistors in each sub-pixel may occur.

Since the deterioration of the organic light emitting diodes in each subpixel also progresses as the driving time increases, the characteristic values such as the threshold voltage may change, and the degree of deterioration between the organic light emitting diodes may be different. Deviations may occur.

As described above, the characteristic value deviation between the subpixels caused by the characteristic value deviation between the driving transistors and the characteristic value deviation between the organic light emitting diodes causes a luminance deviation between the subpixels, which causes a screen abnormal phenomenon such as afterimage of the screen, It is possible to cause non-uniformity.

Thus, a technique for compensating for the deviation of characteristic values between subpixels has been developed. In the compensation method, a sensing value (Vsen) is obtained after sensing the characteristic value of the driving transistor or the organic light emitting diode of the subpixel by sensing driving the organic light emitting display device, and data to be applied to the subpixel based on the sensing value (Vsen) As shown in FIG.

As shown in FIG. 1 (A), the full sensing method for sensing the entire screen every time power is applied has a problem that the power on time is increased because the entire panel is sensed. In order to solve this problem, the proposed method divides the panel area into multiple areas (①, ②, ③, ④) and discrete sensing. It is a sensing method that can reduce the sensing time by sensing the entire area of the screen without dividing the sensing area at one time, The sensing time is reduced by sequentially sensing the plurality of divided regions in this manner. Thus, the boot time after power is applied can be reduced.

However, in the sensing data according to the discrete sensing method, only the data in the sensing area is updated. As shown in FIG. 2, in the case of the first sensing only after the deterioration progresses to some extent, only the initial sensing data is retained without the current sensing data in the areas (2) to (4) In the deterioration compensation, the initial sensing data is retained even though the deterioration has progressed to the areas (2) to (4). Therefore, the degradation compensation is not reflected in the areas (2) to (4).

Only the region (2) is sensed at the time of secondary sensing after deterioration has progressed due to use for a long time after the primary sensing. In this case, the area (1) uses the previous sensing information, and the areas (3) to (4) maintain the initial sensing data as in the primary sensing. During degradation compensation, the initial sensing data is retained even though the deterioration has progressed to the areas (3) to (4). Therefore, the degradation compensation is not reflected in the areas ③ to ④.

After deterioration due to use for a long period of time after the second sensing, the third area is sensed at the third sensing time. The first area and the second area use the previous sensing information, and the area ④ holds only the initial sensing data as in the first and second sensing. Despite the deterioration of the area (4), the initial sensing data is maintained when the deterioration compensation is performed. Therefore, the deterioration compensation is not reflected in the area?

Therefore, as the discrete sensing method is repeated and the interval becomes longer, the difference between the degree of actual deterioration and the compensation data becomes larger for the region (4). That is, although the area ④ is deteriorated, the compensation data calculated using the initial sensing value is used to cause a luminance difference with other areas.

On the other hand, when discrete sensing is performed, unnecessary sensing may also be performed in a region having a low degradation level. Particularly, as shown in FIG. 3, if the white state input is continued only for a part as shown in FIG. 3 (a) and the deterioration becomes worse, the corresponding region may be compensated and the other region b may be unnecessarily output at low luminance. That is, when selecting the gain for compensating the deterioration of the organic light emitting diode device, the lookup data for extracting the gain depends on the target luminance. In this case, when the deterioration of a specific region becomes severe, the gain value is applied to maintain the existing luminance and the target luminance is lowered to maintain the lifetime of the device. In this case, the area where the deterioration has progressed to a relatively low level represents a lower luminance although the lifetime of the organic light emitting device is still good. Therefore, a step due to the luminance difference may be generated, or the lifetime of the product may be reduced due to the decrease of the total luminance.

It is an object of the present invention to provide an organic light emitting display device and a driving method thereof, which can prevent a compensating error and a deterioration of picture quality caused when a deterioration of an organic light emitting diode is compensated.

It is another object of the present invention to provide an organic light emitting display and a method of driving the same that can solve the problem of the discrete sensing method.

Another object of the present invention is to compensate for the luminance deviation between the regions which occurs when the sensing interval is long when the deterioration of the organic light emitting diode is sensed by the discrete sensing method.

In order to achieve the above objects, an organic light emitting diode display according to the present invention, when sensing deterioration of an organic light emitting diode by a discrete sensing method, adds an offset value to compensating data of a non- The luminance deviation can be reduced.

An organic light emitting display according to the present invention includes: a display panel including a plurality of subpixels each having an organic light emitting diode and a driving transistor for driving the organic light emitting diode; A gate driver for supplying a scan signal to the display panel; A data driver for supplying a data voltage to the display panel; A deterioration sensing unit that divides the display panel into a plurality of regions and senses a deterioration state of the organic light emitting elements in each region by a discrete sensing scheme; And the deterioration compensation offset according to the sensing time is reflected in the area where the current deterioration sensing is not performed by utilizing the sensing information provided from the deterioration sensing unit and the information stored in the built-in display time counter (DTC) And a timing controller for outputting a deterioration compensation signal so as to reduce the deterioration compensation signal.

In the organic light emitting diode display according to the preferred embodiment of the present invention, the timing controller determines a deterioration level for each region and controls the degradation sensing unit to sense the degradation level according to priority.

In the organic light emitting diode display according to the preferred embodiment of the present invention, the timing controller analyzes the image data information and counts white matter data for each region to select a priority of the sensing region.

In the organic light emitting diode display according to the preferred embodiment of the present invention, the timing control unit resets the priority region data of the sensed region.

In the organic light emitting display according to the preferred embodiment of the present invention, when the different regions have the same deterioration level, the timing controller assigns priority to the upper region of the divided display region.

In the organic light emitting display according to the preferred embodiment of the present invention, the timing controller extracts the deterioration compensation value by reflecting the deterioration level of the entire area stored in the lookup table (LUT) when determining the target luminance.

A method of driving an organic light emitting display according to the present invention includes: obtaining final driving time information from a display time counter (DTC) when power is applied; Dividing the display panel into a plurality of regions, determining a priority order of sensing for each region according to output information of white-area data for each region, and sensing a deterioration state of the organic light-emitting devices in each region by a discrete sensing scheme; Resetting the accumulated prioritized area data of the sensed area; Calculating a deterioration compensation value by reflecting the deterioration level of the entire area stored in the lookup table (LUT); And determining a data voltage to be provided to the data driver using the calculated deterioration compensation value.

In the method of driving an organic light emitting diode display according to the present invention, the step of calculating the deterioration compensation value reflects a deterioration compensation offset at a sensing time point in an area where no current deterioration sensing progresses.

The organic light emitting display device and the driving method thereof according to the present invention can exhibit the following effects.

First, it is possible to prevent a compensating error and a deterioration of screen quality, which are caused when the deterioration of the organic light emitting diode is compensated.

Secondly, it is possible to solve the problems caused by sensing the deterioration state of the organic light emitting diode by the discrete sensing method and compensating for deterioration.

Third, when the deterioration compensation is performed by sensing the deterioration of the organic light emitting diode by the discrete sensing method, the luminance deviation between the regions caused when the sensing interval is long can be compensated.

FIG. 1 is a diagram illustrating an example of a method of sensing a discrete sensing type deterioration according to the related art.
2 is an exemplary diagram illustrating a deterioration compensation method according to a conventional sensing method using a discrete sensing method.
FIG. 3 is a diagram illustrating a phenomenon in which an undesired region is deteriorated in luminance in the deterioration compensation according to the conventional sensing method deterioration sensing.
4 is a block diagram schematically showing a configuration of an organic light emitting diode display according to the present invention.
5 is a view illustrating an operation of using a DTC in a timing control unit in an OLED display according to the present invention.
6 is a view illustrating an example of a sub-pixel structure of an OLED display according to an embodiment of the present invention.
7 is a view illustrating an exemplary structure of an OLED display according to another embodiment of the present invention.
8 is a flowchart illustrating a method of driving an OLED display according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating an example in which a priority is applied to the organic light emitting display according to the present invention.
10 is a diagram illustrating the concept of sensing and deterioration compensation of an OLED display according to an embodiment of the present invention.

For specific embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be embodied in various forms, And should not be construed as limited to the embodiments described.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises ", or" having ", and the like, are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be construed to indicate meaning consistent with the meaning of the context in the relevant art and are to be construed as either ideal or overly formal in meaning unless expressly defined in the present application Do not.

On the other hand, if an embodiment is otherwise feasible, the functions or operations specified in a particular block may occur differently than the order specified in the flowchart. For example, two consecutive blocks may actually be performed at substantially the same time, and depending on the associated function or operation, the blocks may be performed backwards.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

4 is a block diagram schematically showing a configuration of an organic light emitting display according to the present invention. 4, the OLED display 100 includes a plurality of data lines DL1 to DLm, m is a natural number of 2 or more, and a plurality of gate lines GL1 to GLn, where n is a natural number of 2 or more. A display panel 110 in which a plurality of subpixels are arranged in a matrix type, a data driver 120 driving a plurality of data lines DL1 to DLm, a plurality of gate lines GL1 to GLn, A deterioration sensing unit 150 for dividing the display panel into a plurality of regions and sensing a deterioration state of the organic light emitting elements by a discrete sensing scheme; The deterioration compensation offset according to the sensing time is reflected in the area where the current deterioration sensing is not performed by utilizing the sensing information provided from the deterioration sensing unit 150 and the information stored in the built-in display time counter (DTC) And a timing controller 140 for outputting a deterioration compensating signal so as to reduce a luminance deviation between regions.

The deterioration sensing unit 150 may be included in the data driver 120 to control the characteristics of the subpixel (e.g., the threshold voltage and the mobility of the driving transistor, the threshold voltage of the organic light emitting diode, and the luminance of the subpixel) And may include an analog digital converter (ADC) to compensate for the characteristics of sub-pixels.

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

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

The timing controller 140 supplies various control signals to the data driver 120 and the gate driver 130 to control the data driver 120 and the gate driver 130. The timing controller 140 starts scanning according to the timing implemented in each frame, 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.

Under the control of the timing controller 140, the gate driver 130 sequentially supplies the scan signals of the On voltage or the Off voltage to the plurality of gate lines to sequentially drive the plurality of gate lines . 4, the gate driver 130 may be located only on one side of the display panel 110, or on both sides of the display panel 110, depending on the driving method. In addition, the gate driver 130 may include one or more gate driver integrated circuits (GDICs). Each of the one or more gate driver ICs included in the gate driver 130 may include a shift register, a level shifter, and the like.

When the specific gate line is opened, the data driver 120 converts the image data received from the timing controller 140 into an analog data voltage and supplies the data voltage to the data lines to drive the plurality of data lines. The data driver 120 may include at least one source driver integrated circuit (SDIC) to drive a plurality of data lines. Each of the source driver integrated circuits included in the data driver 120 may include a logic unit including a shift register and a latch circuit, a digital analog converter (DAC), an output buffer, and the like.

On the other hand, the timing controller 140 includes a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input data enable (DE) signal, a clock signal CLK, and the like in addition to the input video data And receives various timing signals from the outside (e.g., the host system). The timing controller 140 may be configured to switch the input image data input from the outside in accordance with the data signal format used by the data driver 120 and to output the converted image data to the data driver 120 and the gate driver 130 A timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input DE signal and a clock signal to generate various control signals and supplies the generated control signals to the data driver 120 and the gate driver 130 .

For example, in order to control the gate driver 130, the timing controller 140 may include 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 section 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 integrated circuits.

In order to control the data driver 120, the timing controller 140 generates a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE) Output enable (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.

The timing control unit 140 is connected to a source printed circuit board on which the source driver integrated circuit is bonded and a control printed circuit (not shown) connected via a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit And may be disposed on a substrate (Control Printed Circuit Board).

A power controller (not shown) for controlling various voltages or currents to supply or supply various voltages or currents to the display panel 110, the data driver 120, the gate driver 130, . These power controllers are also referred to as power management ICs (PMICs).

Each of the plurality of subpixels disposed in the display panel 110 of the organic light emitting diode display according to the present invention includes an organic light emitting diode (OLED), at least two transistors, at least one capacitor, Device.

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

5 is a view illustrating an operation of using a DTC in a timing control unit in an OLED display according to the present invention. As shown in the figure, a display time counter (DTC) 141 is built in the timing controller 140 and calculates a driving time. The timing controller 140 uses the time stored in the flash memory (NAND) 160 every time the power is turned ON as driving start time information. The timing controller 140 periodically updates the driving time in the flash memory 160. [ The timing control unit 140 further applies the compensation offset according to time to the area where the current sensing is not performed by utilizing the information of the display time counter (DTC) Accordingly, the organic light emitting display according to the present invention can reduce a variation in luminance between regions that may occur when the sensing interval is long in the discrete sensing method.

6 is a view illustrating an example of a sub-pixel structure of an OLED display according to an embodiment of the present invention. 6, each subpixel SP disposed in the display panel 110 according to the present invention includes an organic light emitting diode (OLED), a driving transistor (DRT), a switching transistor (SWT) , A sensing transistor (SENT), and a storage capacitor (Cst).

As shown in FIG. 6, a sub-pixel structure including three transistors DRT, SWT, and SENT and one capacitor Cst is referred to as a 3T (Capacitor) structure. The organic light emitting diode OLED may include, for example, 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). For example, the first electrode of the organic light emitting diode OLED is connected to the N2 node (e.g., a source node or a drain node) of the driving transistor DRT, and the second electrode of the organic light emitting diode OLED is connected to the ground voltage ) May be applied. The driving transistor DRT is a transistor for driving the organic light emitting diode OLED by supplying driving current to the organic light emitting diode OLED and includes a driving voltage line DVL for supplying a driving voltage EVDD, OLED). ≪ / RTI >

The driving transistor DRT includes an N1 node (first node) corresponding to a gate node, an N2 node (second node) corresponding to a source node or a drain node, an N3 node Third node).

The switching transistor SWT is a transistor for transferring the data voltage Vdata to the N1 node of the driving transistor DRT and includes a data line DL for supplying the N1 node of the driving transistor DRT and the data voltage Vdata, Respectively.

The switching transistor SWT may be turned on by the scan signal SCAN applied to the gate node to transfer the data voltage Vdata to the node N1 corresponding to the gate node of the driving transistor DRT.

The storage capacitor Cst is a capacitor for maintaining a constant voltage for one frame time and is electrically connected between the N1 node and the N2 node of the driving transistor DRT.

The sensing transistor SENT is a transistor which applies the initialization voltage Vpre to the N2 node of the driving transistor DRT or is involved in the voltage sensing of the N2 node of the driving transistor DRT, And is electrically connected between a node and a reference voltage line (RVL) for supplying the initialization voltage Vpre.

The sensing transistor SENT is turned on by a sense signal SENSE which is a kind of a scan signal applied to the gate node so that the initialization voltage Vpre supplied through the reference voltage line RVL is supplied to the driving transistor DRT, The node N2 of FIG.

The gate node of the switching transistor SWT and the gate node of the sensing transistor SENT may be electrically connected to the same gate line. In other words, gate signals SCAN and SENSE can be commonly applied to the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT through one identical gate line. At this time, the scan signal SCAN and the sense signal SENSE are the same gate signal.

Alternatively, the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT may be electrically connected to different gate lines. In this case, each of the scan signal SCAN and the sense signal SENSE may be separately applied to the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT through different gate lines.

The reference voltage line RVL can be supplied with the initializing voltage by operating the first switch SW1 in accordance with the switch control signal SPRE. A line capacitor Cline may be formed in the reference voltage line RVL.

On the other hand, each driving transistor DRT has a characteristic value such as a threshold voltage (Vth) and a mobility. In addition, the driving transistor DRT may be degraded according to the driving time, and the characteristic value may be changed.

For this reason, there may be a difference in degree of deterioration between the driving transistors DRT in each sub-pixel, and there may be a characteristic value deviation between the driving transistors DRT in each sub-pixel.

The characteristic value deviation between the driving transistors DRT in each sub-pixel may cause a luminance deviation between each sub-pixel, which may be a main factor causing image quality degradation. The characteristic value deviations (e.g., threshold voltage deviations, mobility deviations) between these driving transistors DRT are compensated by the deterioration compensation method called "external compensation ".

(For example, a threshold voltage deviation) between the organic light emitting diodes (OLED) due to the difference in degree of deterioration between the organic light emitting diodes (OLED) in each subpixel. The characteristic value deviation between the organic light emitting diodes (OLED) corresponds to the deviation of the subpixel characteristic value, which causes a luminance deviation between the subpixels, which is a factor that hinders the uniformity of luminance. It is necessary to compensate for the deviation of characteristic values of the subpixels, especially the organic light emitting diode device.

Thus, each subpixel in the display panel 110 according to the present invention has a subpixel structure that can be sensed, as shown in FIG.

6, the deterioration sensing unit 150 of the organic light emitting diode display 100 according to the present invention is a sensing structure for sensing a characteristic value or a characteristic value deviation of each subpixel, SW2 may further include an analog digital converter (ADC) that operates in accordance with the sampling control signal SAM and is electrically connected to the reference voltage line RVL.

The analog-to-digital converter (ADC) senses the voltage of the reference voltage line (RVL), converts sensed sensing value (Vsen: sensing voltage value) into a digital value to generate sensing data, To the timing controller 140.

The analog digital converter ADC senses the voltage of the reference voltage line RVL when the sensing transistor SENT is turned on has the same effect as sensing the voltage of the node N2 of the driving transistor DRT.

Here, the voltage of the node N2 of the driving transistor DRT reflects the characteristic value (e.g., threshold voltage, mobility) of the driving transistor DRT and the characteristic value (e.g., threshold voltage) of the organic light emitting diode OLED Lt; / RTI > In the present invention, an OLED deterioration sensing drive for compensating for a change in a characteristic value due to deterioration of an organic light emitting diode (OLED) will be mainly described.

7 is a view illustrating an exemplary structure of an OLED display according to another embodiment of the present invention. 4, the organic light emitting diode display 200 has a configuration in which the display module unit 210 and the set unit 220 are spaced apart from each other by a predetermined distance. At this time, the timing control unit 221 and the deterioration sensing unit 222 are disposed in the set unit 220. Although not shown, the set unit 220 may include a memory including drive information of the OLED display 200 and compensation data for various compensations.

8 is a flowchart illustrating a method of driving an OLED display according to an embodiment of the present invention. Since the operation of performing the deterioration compensation of the organic light emitting display according to the present invention is implemented by the timing controller 140, the operation body of the following description becomes the timing controller 140. [

As the power is applied, the timing controller 140 acquires the final driving time information from the display time counter (DTC) 141. At this time, the display time counter may include not only the entire driving time of the display device, but also driving time information for each color of RGB displayed through the display device and driving time information for each display area (S801).

The timing controller 140 determines the priority in the area-specific sensing using the last driving time information. The display panel is divided into a plurality of areas, and the priority order of the areas is determined according to the output information of the white data for each area. Discrete sensing is performed with priority given to areas having the largest white property data. If different areas have the same deterioration level, priority is given to the upper area of the divided display area. FIG. 9 is a diagram illustrating an example in which a priority is applied to the organic light emitting display according to the present invention. As shown in the figure, when the whiteness data of the second region (Region 2) is displayed most and deterioration is the most severe, the second region is preferentially sensed. Thereafter, when the degree of deterioration of the first region (Region 1) to the third region (Region 3) is the same level in a state where a predetermined time has elapsed, a first region (Region 1) 3 region (Region 3).

For example, when the accumulated data of the degradation level of the first area and the third area is 50 levels and the accumulated data of the degradation level of the second area is the 400 level, the second area is ranked first in the first sensing, The region is ranked second, and the third region is ranked third. The cumulative data is reset to "0" in the priority selection counter area of the second area where the sensing is completed.

And drives the organic light emitting diode device in the corresponding region in a discrete sensing manner according to the determined priority order to receive the characteristic value of the organic light emitting device through the degradation sensing unit 150. At this time, the deteriorated state is sensed by reflecting a deterioration compensation offset according to the sensing time with respect to an area in which no deterioration sensing is currently performed. That is, as shown in FIG. 10, unlike the prior art in which the initial sensing data is retained for the regions (2) to (4) when sensing the region (1) only during the primary deterioration sensing after the deterioration progresses to some extent, And the degradation compensation offset value is reflected for the area (4). Thereafter, when deterioration has progressed after a predetermined time has elapsed, secondary sensing is performed. For example, in the case of performing the area (2), the offset value is added to the previous sensing value for the area (1), and the degradation compensation offset value is reflected for the areas (3) and (4) S802).

And resets the accumulated priority selection area data of the sensed area. That is, the compensation according to the deterioration is performed, and the priority selection data of the corresponding area is prevented from being used again in a state where the predetermined time has elapsed (S803).

When the target luminance is determined, the deterioration compensation value is calculated by reflecting the deterioration level of the entire area stored in the look-up table (LUT). The look-up table stores the total deterioration level information of the first to third regions. That is, the accumulated data of the degradation level of the first area is 50, the accumulated data of the degradation level of the second area is 400, and the accumulated data of the degradation level of the third area is stored at the 50 level. The timing controller 140 selects a corresponding compensation value stored in the lookup table based on the 166 level, which is the average value of the degradation levels of the first to third areas (S804). The data voltage to be provided to the data driver is determined using the calculated deterioration compensation value, and compensation according to deterioration is performed (S805).

If the image displayed through the display device is displayed in the same manner as at the primary sensing time, the deterioration level accumulated data of each area is stored in the deterioration level accumulated data of the first area The cumulative degradation level data of the second region is 400, and the cumulative degradation level data of the third region is calculated as 50 levels. At this time, the determination of the sensing area prioritization in the timing controller 140 is determined to preferentially sense the second area as in the first sensing. The total deterioration level information of the first to third regions stored in the lookup table is stored as 100 levels, 800 levels, and 100 levels, respectively.

As described above, in the organic light emitting diode display according to the present invention, when the display screen is divided into a plurality of regions and subjected to discrete sensing, the deterioration levels between the regions are grasped and priorities are specified, do. At this time, the area having the largest white property data is determined as the priority sensing area. For a region where deterioration sensing is not performed, the deterioration state can be sensed by reflecting a deterioration compensation offset at a sensing time point, thereby reducing the luminance deviation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100, 200: organic light emitting display device 110: display panel
120: Data driver 130: Gate driver
140, 221: timing control section 141: DTC
150, 222: Deterioration sensing section 160: NAND memory
210: display module unit 220:

Claims (8)

A display panel including a plurality of subpixels each having an organic light emitting diode and a driving transistor for driving the organic light emitting diode;
A gate driver for supplying a scan signal to the display panel;
A data driver for supplying a data voltage to the display panel;
A deterioration sensing unit that divides the display panel into a plurality of regions and senses a deterioration state of the organic light emitting elements in each region by a discrete sensing scheme; And
By using the sensing information provided from the deterioration sensing unit and the information stored in the built-in display time counter (DTC), the deterioration compensation offset according to the sensing time is reflected in the area where the current deterioration sensing is not performed, And a timing controller for outputting a deterioration compensation signal so as to reduce the deterioration compensation signal. The organic light emitting diode display according to claim 1, wherein the timing controller controls the deterioration sensing unit to determine a deterioration level for each region and to sense the deterioration level according to priority. The organic light emitting diode display of claim 2, wherein the timing controller analyzes the image data information and counts white matter data for each region to select a priority of the sensing region. The organic light emitting diode display according to claim 2, wherein the timing control unit resets the prioritized region data of the sensed region. The organic light emitting diode display according to claim 2, wherein the timing controller assigns priorities to the top region of the divided display regions when the different regions have the same deterioration level. The organic light emitting diode display according to claim 2, wherein the timing controller extracts a deterioration compensation value by reflecting a deterioration level of the entire area stored in a lookup table (LUT) when determining the target luminance. Obtaining final driving time information from a display time counter (DTC) as the power is applied;
Dividing the display panel into a plurality of regions, determining a priority order of sensing for each region according to output information of white-area data per region, and sensing a deterioration state of the organic light-emitting devices in each region by a discrete sensing method;
Resetting the accumulated prioritized area data of the sensed area;
Calculating a deterioration compensation value by reflecting the deterioration level of the entire area stored in the lookup table (LUT);
And determining a data voltage to be provided to the data driver using the calculated deterioration compensation value. 8. The method of claim 7, wherein the calculating the deterioration compensation value comprises:
Wherein the deterioration compensation offset according to the sensing time is calculated by reflecting the deterioration compensation offset in an area where no current deterioration sensing progresses.

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