KR102383640B1 - Organic light emmiting display with increasing degradation compensating - Google Patents

Abstract

An organic light emitting display device in which deterioration compensation efficiency is enhanced is published. In the organic light emitting display device of the present invention, the aging pixels for determining the degree of deterioration are disposed in a different area from the display pixels for displaying an image. Accordingly, according to the organic light emitting display device of the present invention, the aperture ratio is greatly improved. In addition, in the organic light emitting display device of the present invention, a plurality of aging pixels that are deteriorated by reflecting data values of image driving data of corresponding display pixels in each frame are included. In this case, the plurality of aging pixels are driven to be deteriorated with data values of different image driving data. That is, different degrees of deterioration are directly sensed by the plurality of aging pixels, and the various degrees of deterioration sensed by the plurality of aging pixels are reflected in deterioration compensation of the corresponding display pixels. Therefore, the efficiency of deterioration compensation for the display pixel is greatly improved. As a result, according to the organic light emitting display device of the present invention, while having a high aperture ratio, it is possible to more accurately reflect the degree of deterioration of pixels, that is, effective deterioration compensation is performed, and thus a higher quality image is provided.

Description

Organic light emitting display device with enhanced degradation compensation efficiency {ORGANIC LIGHT EMMITING DISPLAY WITH INCREASING DEGRADATION COMPENSATING}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device with enhanced degradation compensation efficiency.

In general, a display panel of an organic light emitting display device is configured to include pixels arranged on a matrix structure including gate lines and data lines. In addition, each pixel includes an organic light emitting diode, and generates light according to driving data supplied from its own data line. In order for the display panel to display an image of excellent quality, it is very important to maintain luminance uniformity in which pixels exhibit the same luminance with respect to driving data having the same data value.

Meanwhile, one of the factors degrading the luminance uniformity between pixels of a display panel is known as a deterioration deviation between pixels. That is, the deterioration of the pixel is caused by, for example, the accumulation of stress depending on the driving time, the driving voltage, and the like. In this case, the accumulated stress between each pixel may be different. In this case, even if a driving current according to the same driving data is supplied to the organic light emitting diode of a pixel, deterioration deviation occurs due to a difference in accumulated stress, and as a result, a luminance deviation occurs between the pixels.

The deterioration deviation between the pixels causes an image sticking phenomenon and acts as a factor degrading the image quality of a displayed image. Accordingly, the organic light emitting display device generally has a deterioration compensation function in order to alleviate deterioration of image quality due to deterioration.

One of the degradation compensation methods is a method of checking the accumulated stress of the display pixel and estimating and compensating for the deterioration according to the checked cumulative stress. This method has a high overall aperture ratio because sensing pixels are not disposed in the displayed area, but has a disadvantage in that it does not accurately reflect the degree of deterioration of each display pixel.

And, another of the degradation compensation methods is to directly sense the degree of degradation of each pixel, and to compensate the degradation according to the sensed degree of degradation. Although this method has the advantage of accurately reflecting the degree of deterioration of pixels, it has disadvantages in that the structure is complicated and the aperture ratio is low.

Accordingly, there is a need for an organic light emitting display device in which deterioration compensation efficiency is further enhanced.

Publication No. 10-2013-0067092, publication date June 21, 2013 Publication No. 10-2017-0036938, published on April 04, 2017 Publication No. 10-2017-0136028, publication date December 11, 2017 Publication No. 10-2012-0022411, publication date March 12, 2012 Publication No. 10-2010-0012247, publication date February 08, 2010 Publication No. 10-2016-0055561, publication date May 18, 2016

SUMMARY OF THE INVENTION It is an object of the present invention to provide an organic light emitting display device in which deterioration compensation efficiency is further enhanced.

One aspect of the present invention for achieving the above object relates to an organic light emitting display device having a deterioration compensation function. The organic light emitting display device of the present invention is an image display block in which a plurality of display pixels driven to display an image for each frame are arranged in an image display operation, wherein each of the plurality of display pixels is a respective image in the image display operation the image display block accessed by light emission according to driving data; an aging display block in which a plurality of aging pixels are arranged, wherein each of the plurality of aging pixels is driven to read a respective deterioration sensing value, which is an electrical component reflecting a degree of deterioration thereof in a deterioration sensing operation; and deterioration correlation information indicating a deterioration confirmation value for each of a plurality of standard cumulative stress indices, wherein the deterioration correlation information is updated depending on the deterioration sensing value of each of the plurality of aging pixels as a deterioration compensation control block. and, the deterioration compensation control block for providing the respective image driving data by compensating for deterioration of the original image data of each of the plurality of display pixels according to the deterioration correlation information. The degradation compensation for the original image data is performed depending on the deterioration confirmation value of the standard cumulative stress index corresponding to the image cumulative stress index of the display pixel corresponding to the original image data, wherein the image cumulative stress index is It represents the cumulative stress of the display pixel. And, each of the plurality of aging pixels of the aging display block is driven to deteriorate by reflecting the data value of the image driving data of the plurality of display pixels corresponding to the image display block in each frame, the deterioration In order to generate correlation information, it is driven so as to be deteriorated with data values of different image driving data.

In the organic light emitting display device of the present invention as described above, the aging pixels for determining the degree of deterioration are disposed in a different area from the display pixels for displaying an image. Accordingly, according to the organic light emitting display device of the present invention, the aperture ratio is greatly improved. In addition, the organic light emitting display device of the present invention includes a plurality of aging pixels that are deteriorated by reflecting data values of image driving data of corresponding display pixels in each frame. In this case, the plurality of aging pixels are driven to be deteriorated with data values of different image driving data.
That is, different deterioration information is directly sensed by the plurality of aging pixels, and various degrees of deterioration sensed by the plurality of aging pixels are reflected in deterioration compensation of the corresponding display pixels. Therefore, the efficiency of deterioration compensation for the display pixel is greatly improved.

As a result, according to the organic light emitting display device of the present invention, while having a high aperture ratio, it is possible to more accurately reflect the deterioration degree of pixels, that is, effective deterioration compensation is performed, and thus a higher quality image is provided.

A brief description of each figure used in the present invention is provided.
1 is a view showing an organic light emitting display device according to an embodiment of the present invention.
FIG. 2 is a view showing the image display block and the aging display block of FIG. 1 in detail.
FIG. 3 is a diagram for explaining driving of the display pixel shown in FIG. 2 , and one display pixel and related configurations are shown.
FIG. 4 is a diagram for explaining the driving of the aging pixel shown in FIG. 2 , and one aging pixel and related configurations are shown.
FIG. 5 is a view for explaining changes in the maximum value of the image cumulative stress index and the maximum value of the aging cumulative stress index of FIG. 1 .
FIG. 6 is a diagram illustrating the deterioration compensation control unit of FIG. 1 in more detail.
7 is a diagram illustrating the cumulative stress storage unit of FIG. 6 in more detail.
FIG. 8 is a diagram illustrating the deterioration compensation unit of FIG. 6 in more detail.
FIG. 9 is a diagram for explaining an example of deterioration compensation for original image data of the display pixel of FIG. 1 .
10 is a flowchart for explaining the driving of the organic light emitting display device of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and that the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

And, in understanding each drawing, it should be noted that the same members are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the gist of the present invention will be omitted.

Meanwhile, in the present specification, reference signs are added within < > together with the same reference signs for components that perform the same configuration and action. In this case, these components are collectively referred to as reference numerals. And, when it is necessary to distinguish them individually, '< >' is added after the reference sign.

In describing the contents of the present invention throughout the specification, a plurality of expressions for each component may also be omitted. For example, even if it is composed of a plurality of signal lines, it may be expressed as 'signal lines' or in a singular form such as 'signal lines'. This is also because it is not necessary to divide the signal lines into singular and plural when the signal lines also have the same properties, for example, in a bundle like data signals. In this respect, this description is reasonable. Therefore, expressions similar to these should also be interpreted in the same sense throughout the specification.

In addition, in this specification, 'frame' means 'unit displaying one image' as a whole. In addition, frames for various types of physical components of the present specification may be indicated. That is, when '_(k-1)' is added after the reference sign of the physical component, it means the physical component in the 'previous frame' that is the (k-1)-th frame. On the other hand, when '_k' is added after the reference sign of the physical component, it means the physical component in the 'current frame', which is the k-th frame.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described in more detail.

1 is a diagram illustrating an organic light emitting display device having a deterioration compensation function according to an embodiment of the present invention.

The organic light emitting display device of the present invention performs 'image display operation' and 'deterioration sensing operation'. In the present embodiment, the display driving signal XCONDP is activated in the 'image display operation', and the sensing driving signal XCONSN is activated in the 'deterioration sensing operation'. In the present embodiment, the 'image display operation' and the 'deterioration sensing operation' may be overlapped.

In addition, in this specification, detailed illustration and description of various signals performing the 'image display operation' and the 'degradation sensing operation' may be omitted. This can be easily implemented by those skilled in the art of the present invention, and is also for simplification of description. Therefore, the omission of illustration and description of these signals does not reduce the protection scope of the present invention.

Also, in this embodiment, ˜data, ˜stress index, ˜value, etc. may be transmitted in a serial manner through one or several signal lines. In this case, the reference symbol 'SYNC' indicated by a dashed-dotted line means that a corresponding component or component among each component of the present invention can be synchronized.

And, such synchronization can be easily implemented by those skilled in the art. Therefore, in the present specification, a detailed description thereof is omitted for the sake of simplicity of description.

Referring to FIG. 1 , the organic light emitting display device of the present invention includes an image display block 100 , an aging display block 200 , and a deterioration compensation control block 300 .

In the image display block 100, n display pixels PIXd<1:n> driven to display an image for each frame in the 'image display operation' are arranged. In addition, m aging pixels PIXg<1:m> are disposed in the aging display block 200 . In this embodiment, both n and m are natural numbers greater than or equal to 2, but m is a very small natural number compared to n.

Each of the display pixels PIXd<1:n> is light-emitted according to the respective image driving data DATDRd<1:n> in the 'image display operation'.

In addition, each of the m aging pixels PIXg<1:m> is degraded to reflect the degree of degradation of the display pixels PIXd<1:n>. That is, each of the m aging pixels PIXg<1:m> is driven to be deteriorated by reflecting the data value (distribution range) of the image driving data DATDRd<1:n> in each frame.

As a result, even when the organic light emitting display device of the present invention is used for a long period of time, the m aging pixels PIXg<1:m> show the distribution of the deterioration degree of the display pixel PIXd<1:n>. It is effectively reflected and deteriorated. In addition, the degree of deterioration of each of the m aging pixels PIXg<1:m> may be different from each other.

In this case, each of the m aging pixels PIXg<1:m> may be implemented to independently access light emission with respect to the light emission accessing of the display pixels PIXd<1:n>.

For example, the m aging pixels PIXg<1:m> are light-emitted together with the display pixels PIXd<1:n>, mainly in the 'image display operation'. However, when the 'deterioration sensing operation' is performed, even though the display operation is performed, light emission accessing of the aging pixels PIXg<1:m> is blocked.

In addition, each of the m aging pixels PIXg<1:m> is light-emitted according to the respective aging driving data DATDRg<1:m>. As the light emission accessing is repeatedly performed, each of the m aging pixels PIXg<1:m> is accessed to have different degrees of degradation.

In addition, each of the m aging pixels PIXg<1:m> is an electrical component (eg, a voltage level, a current value, etc.) that reflects the degree of its deterioration in the 'deterioration sensing operation' and a respective deterioration sensing value It is driven to read (VSEN<1:m>). In this case, it is apparent to those skilled in the art that the deterioration sensing value VSEN<1:m> of each of the m aging pixels PIXg<1:m> may be different from each other.

In the present embodiment, the deterioration sensing value VSEN<1:m> is a voltage level. It is apparent to those skilled in the art that the deterioration sensing value VSEN<1:m> of this voltage level can be obtained by integrating and converting the amount of current sensed from each of the aging pixels PIXg<1:m>.

And, in the present embodiment, the 'deterioration sensing operation' is performed under a specific condition, such as when power is turned on or when a predetermined time has elapsed.

For reference, in this specification, an embodiment in which one aging pixel PIXg exists one by one for each degree of deterioration is illustrated and described. However, the technical idea of the present invention may also be implemented by an embodiment in which a plurality of the aging pixels PIXg exist for the same degree of deterioration. In this case, the deterioration sensing value VSEN<1:m> may be understood as an average of the deterioration sensing values VSEN of each of the plurality of aging pixels PIXg for the same degree of deterioration.

Meanwhile, the degree of deterioration of the display pixels PIXd and the aging pixels PIXg depends on their respective cumulative stresses. In this case, it is known that the unit stress of the display pixels PIXd and the aging pixels PIXg depends on the respective sizes of the image driving data DATDRd and the aging driving data DATDRg.

In addition, the display pixels PIXd and the aging pixels PIXg emit light with luminance according to the respective values of the image driving data DATDRd and the aging driving data DATDRg.

In addition, the display pixels PIXd and the aging pixels PIXg have the same values of the image driving data DATDRd and the aging driving data DATDRg as the degree of deterioration (ie, cumulative stress) increases. In contrast, the luminance is lowered.

Still referring to FIG. 1 , the deterioration compensation control block BKCON stores deterioration correlation information IFDE.

Here, the deterioration correlation information (IFDE) represents a deterioration confirmation value (FVA) for each of a plurality of standard cumulative stress indices (RPST) (refer to FIG. 8 ).

For reference, the deterioration confirmation value (FVA) is a value for numerically confirming the degree of deterioration with respect to each of the plurality of standard cumulative stress indices (RPST). And, as will be described later, the deterioration confirmation value FVA is used as a basis for luminance compensation of the display pixels PIXd and the aging pixels PIXg.

In addition, the deterioration confirmation value FVA of the deterioration correlation information IFDE is updated depending on the deterioration sensing value VSEN of each of the plurality of aging pixels PIXg.

In addition, the deterioration compensation control block BKCON compensates for deterioration of the original image data DATQRd of each of the plurality of display pixels PIXd of the image display block 100 according to the deterioration correlation information IFDE, so that each of the image driving data DATDRd.

In this case, the degradation compensation for the original image data DATQRd is the deterioration confirmation value FVA of the standard cumulative stress index RPST corresponding to the image cumulative stress index ASTd of the display pixel PIXd corresponding thereto. ) depends on it.

Here, the image cumulative stress index ASTd represents the cumulative stress of the display pixel PIXd corresponding thereto.

If there is no standard cumulative stress index (RPST) matching the image cumulative stress index (ASTd), the standard cumulative stress index (RPST) closest to the image cumulative stress index (ASTd) or two adjacent values It is confirmed as the deterioration confirmation value (FVA) of the calculated standard cumulative stress index (RPST) by interpolation with .

In the organic light emitting display device of the present invention configured as described above, the aging pixels PIXg for detecting the degree of deterioration are disposed in a different area from the display pixels PIXd for displaying an image. Accordingly, according to the organic light emitting display device of the present invention, the aperture ratio is greatly improved.

In addition, in the organic light emitting display device of the present invention, a plurality of aging pixels PIXg that are deteriorated by reflecting the data value of the image driving data DATDRd of the corresponding display pixels PIXd in each frame are provided. In this case, the plurality of aging pixels PIXg are driven to deteriorate to data values of different image driving data DATDRd.

That is, different deterioration information is directly sensed by the plurality of aging pixels PIXg, and various degrees of deterioration sensed by the plurality of aging pixels PIXg are reflected in deterioration compensation of the corresponding display pixels PIXd. . Therefore, the efficiency of deterioration compensation for the display pixel is greatly improved.

As a result, according to the organic light emitting display device of the present invention, while having a high aperture ratio, it is possible to more accurately reflect the deterioration degree of pixels, that is, effective deterioration compensation is performed, and thus a higher quality image is provided.

Subsequently, each component of the organic light emitting display device of the present invention shown in FIG. 1 will be specifically described.

FIG. 2 is a view showing the image display block 100 and the aging display block 200 of FIG. 1 in detail. Referring to FIG. 2 , the image display block 100 includes an image display panel 110 , an image gate driving circuit 130 , and an image data driving circuit 150 .

In the image display panel 110 , a plurality of display pixels PIXd<1:n> are arranged in a matrix structure including image gate lines GLd and image data lines DLd. The image gate driving circuit 130 is driven to selectively activate the image gate lines GLd. The image data driving circuit 150 is driven to drive the image data lines DLd according to the image driving data DATDRd of each of the corresponding display pixels PIXd.

Next, driving of the display pixel PIXd is described.

FIG. 3 is a diagram for explaining driving of the display pixel PIXd shown in FIG. 2 , and one display pixel PIXd and related configurations are shown.

For reference, it is known to those skilled in the art that the display pixel PIXd shown in FIG. 3 is an example of the simplest form, and the transistor expressed as NMOS may be composed of PMOS, and that other elements for Vt compensation may be provided. self-evident

Referring to FIG. 3 , when each of the plurality of display pixels PIXd is selected by activation of the corresponding image gate line GLd, the organic light emitting diode is accessed according to its own image driving voltage VDRd. (113).

In this case, the image driving current IDRd of each of the plurality of display pixels PIXd is the amount of current converted by the DAC 151 from the image driving data DATDRd, and the corresponding image data lines DLd are transmitted through

Meanwhile, as the 'image display operation' is repeatedly performed, the organic light emitting diodes 113 of the plurality of display pixels PIXd are gradually deteriorated. In addition, the organic light emitting diode 113 of the plurality of display pixels PIXd is greatly deteriorated as the image driving current IDRd increases.

Referring back to FIG. 2 , the aging display block 200 includes an aging display panel 210 , an aging gate driving circuit 230 , and an aging data driving sensing circuit 250 .

In the aging display panel 210 , a plurality of aging pixels PIXg<1:m> are arranged in a matrix structure. In this case, each of the plurality of aging pixels PIXg<1:m> is specified for light emission accessing by an aging display gate line GLDg and an aging data line DLg. In addition, each of the plurality of aging pixels PIXd<1:m> is specified by an aging sensing gate line GLSg and an aging sensing line SLg in the 'deterioration sensing operation'.

The aging gate driving circuit 230 is driven to selectively activate the aging display gate lines GLDg in the 'image display operation'. In addition, the aging gate driving circuit 230 is driven to selectively activate the aging sensing gate lines GLSg in the 'deterioration sensing operation'.

The aging data driving sensing circuit 250 is driven to drive the aging data lines DLg according to the aging driving data DATDRg of each of the aging pixels PIXg corresponding to the 'image display operation'. . In addition, the aging data driving sensing circuit 250 reads the deterioration sensing value VSEN of each of the corresponding aging pixels PIXg through the aging sensing lines SLg in the 'deterioration sensing operation'. is driven

Next, driving of the aging pixel PIXg is described.

FIG. 4 is a diagram for explaining the driving of the aging pixel PIXg shown in FIG. 2 , and one aging pixel PIXg and related configurations are shown.

Referring to FIG. 4 , when each of the plurality of aging pixels PIXg is selected by activation of the corresponding aging display gate line GLDg, the organic light emitting device is accessed according to its own aging driving voltage VDRgd. It includes a diode 213 .

In this case, the aging driving current IDRg of each of the plurality of aging pixels PIXg is the amount of current converted by the DAC 251 from the aging driving data DATDRg, and the corresponding aging data lines DLg are transmitted through

As the 'image display operation' is repeatedly performed, the organic light emitting diodes 213 of the aging pixels PIXg are gradually deteriorated. In addition, the organic light emitting diode 213 of the aging pixels PIXg is greatly deteriorated as the aging driving current IDRg increases.

In addition, when each of the plurality of aging pixels PIXg is selected by activation of the corresponding aging sensing gate line GLSg, the voltage of the anode terminal NAN of the organic light emitting diode 213 corresponds to the aging It is transmitted to the sensing line SLg.

Then, the voltage of the anode terminal NAN of the organic light emitting diode 213 transmitted to the aging sensing line SLg passes through the read element 253 of the aging data driving sensing circuit 250 to the deterioration sensing value ( VSEN) is read.

Meanwhile, in the organic light emitting display device of the present invention according to a preferred embodiment, a blocking material (not shown) is formed on the upper surface of the aging display panel 210 . Therefore, external emission of light emitted from the aging pixels PIXg is blocked by the blocking material ELBK.

In addition, the image display panel 110 and the aging display panel 210 may be implemented in the form of an integrated panel. In this case, a buffering area ARBF is set between the image display panel 110 and the aging display panel 210 . Therefore, the distortion of the image displayed on the image display panel 110 may be alleviated by interference of light emitted from the aging pixels PIXg.

Referring back to FIG. 1 , the deterioration compensation control block BKCON specifically includes an aging data generator 300 and a deterioration compensation controller 400 .

The aging data generator 300 generates original aging data DATQRg of each of the plurality of aging pixels PIXg based on the original image data DATQRd of each of the plurality of display pixels PIXd. .

The deterioration compensation control unit 400 stores the deterioration correlation information IFDE.

In addition, the deterioration compensation control unit 400 performs deterioration compensation of the original image data DATQRd of each of the plurality of display pixels PIXd by using the deterioration correlation information IFDE to compensate for the deterioration of the plurality of display pixels PIXd. ) of each of the image driving data DATDRd.

In addition, the deterioration compensation control unit 400 performs deterioration compensation of the original aging data DATDRg of each of the plurality of aging pixels PIXg by using the deterioration correlation information IFDE to compensate for the deterioration of the plurality of aging pixels PIXg. ) of each of the aging driving data DATDRg.

In this case, the deterioration compensation for the original aging data DATQRg is performed according to the deterioration correlation information IFDE, like the deterioration compensation for the original image data DATQRd.

That is, the deterioration compensation for the original aging data DATQRg is the deterioration confirmation value (FVA) of the standard cumulative stress index (RPST) corresponding to the aging cumulative stress index (ASTg) of the aging pixel PIXg corresponding thereto. ) depends on it (see FIG. 8).

Subsequently, the original aging data DATQRg generated by the aging data generator 300 will be described.

First, the original aging data DATQRg of each of the plurality of aging pixels PIXg in a specified 'current frame (eg, k-th frame)' is the plurality of display pixels PIXd in the 'current frame'. ) are determined based on the maximum data value among the original image data DATQRd, the image cumulative stress index (ASTd), the aging cumulative stress index (ASTg), and the like.

As an example, it is assumed that the maximum data value among the original image data DATQRd of each of the plurality of display pixels PIXd is '255' and m is '9'.

In this case, the original aging data DATQRg<1:9> of each of the plurality of aging pixels PIXg<1:9> may be as shown in (Table 1).

original aging data data value DATQRg<1> 255 DATQRg<2> 223 DATQRg<3> 191 DATQRg<4> 159 DATQRg<5> 127 DATQRg<6> 95 DATQRg<7> 63 DATQRg<8> 31 DATQRg<9> 0

Meanwhile, when the original aging data DATQRg is generated in the same manner as in Table 1, as the 'image display operation' is repeatedly performed, the image cumulative stress index of the plurality of display pixels PIXd The difference between the maximum value of the ASTd and the maximum value of the aging cumulative stress indices (ASTg) of the plurality of aging pixels PIXg becomes larger (see CASE1 in FIG. 5 ). The data DATQRd may not always have a maximum value of 255 in a specific display pixel PIXd. In this case, the difference between the deterioration degree and the aging pixel PIXg<1> preparing for the worst deterioration state increases. Accordingly, each of the aging cumulative stress indices ASTg of the plurality of aging pixels PIXg The gap may be widened, and the effectiveness of the present invention may be reduced.

To prevent this, in a more preferred embodiment, the original aging data DATQRg of each of the plurality of aging pixels PIXg includes the image accumulated stress indexes ASTd of the display pixel PIXd and the plurality of aging data DATQRg. Based on the aging cumulative stress indices (ASTg) of the pixels (PIXg).

For example, when the data setting signal XDASET is activated, the original aging data DATQRg of each of the plurality of aging pixels PIXg in the 'current frame' is basic data (eg, '0') is determined (see CASE2).

And, the data setting signal XDASET is activated in the following case. That is, in the 'previous frame (eg, (k-1)th frame)', the maximum value Dmax_d among the image cumulative stress indices ASTd of the plurality of display pixels PIXd and the plurality of aging pixels ( When the difference (D_dif) of the maximum value among the aging cumulative stress indices (ASTg) of the PIXg) exceeds the allowable range (D_max), the data setting signal XDASET is activated (refer to t1 in FIG. 5 ).

In this case, the original aging data DATQRg<1:9> of each of the plurality of aging pixels PIXg<1:9> may be as shown in (Table 2).

original aging data data value DATQRg<1> 0 DATQRg<2> 0 DATQRg<3> 0 DATQRg<4> 0 DATQRg<5> 0 DATQRg<6> 0 DATQRg<7> 0 DATQRg<8> 0 DATQRg<9> 0

As shown in (Table 2), as the original aging data DATQRg of each of the plurality of aging pixels PIXg is determined as basic data, the aging cumulative stress index ( ASTg) can be alleviated. [0044] Next, the degradation compensation control unit 400 will be described in detail. FIG. 6 is a diagram illustrating the degradation compensation control unit 400 of FIG. 1 in more detail. Referring to FIG. 6 , the deterioration compensation control unit 400 includes a cumulative stress storage unit 410 , a stress confirmation update unit 420 , a correlation confirmation unit 430 , a deterioration compensation unit 440 , and a data setting signal generating unit. (450) is provided.

The cumulative stress storage unit 410 stores the image cumulative stresses ASTd of the plurality of display pixels PIXd and the aging cumulative stresses ASTg of the plurality of aging pixels PIXg.

FIG. 7 is a diagram illustrating the cumulative stress storage unit 410 of FIG. 6 in more detail. Referring to FIG. 7 , the accumulated stress storage unit 410 includes a volatile memory 411 and a nonvolatile memory 413 .

The volatile memory 411 has a relatively high operating speed compared to the non-volatile memory 413 . In addition, the volatile memory 411 stores the image accumulated stresses ASTd of the plurality of display pixels PIXd, and the stress check update unit 420 , the correlation check unit 430 , and the deterioration compensation It communicates with a unit 440 and the data setting signal generating unit 450 .

In this case, the image cumulative stress index ASTd of each of the plurality of display pixels PIXd is updated by adding the corresponding image unit stress index USTd in the current frame. The aging cumulative stress index ASTg of each of the plurality of aging pixels PIXg is updated by adding the corresponding aging unit stress index USTg in the current frame.

Preferably, the volatile memory 411 is SRAM.

The non-volatile memory 413 communicates with the volatile memory 411 . Also, the nonvolatile memory 413 stores the image cumulative stress indices ASTd and the aging cumulative stress indices ASTg even when the power is turned off.

Preferably, the non-volatile memory 413 is a flash memory.

Meanwhile, in the volatile memory 411 and the non-volatile memory 413 , the image cumulative stress indices ASTd and the aging cumulative stress indices ASTg may be stored in separate memory devices.

Referring back to FIG. 6 , the stress check update unit 420 is configured to perform the image unit stress indices USTd of each of the plurality of display pixels PIXd and the aging of each of the plurality of aging pixels PIXg. Check the unit stress indices (USTgs).

In this case, each of the image unit stress indices USTd of each of the plurality of display pixels PIXd corresponds to the original image data DATQRd of each of the plurality of display pixels PIXd. In addition, each of the aging unit stress indices USTg of each of the plurality of aging pixels PIXg corresponds to the original aging data DATQRg of each of the plurality of aging pixels PIXg.

In addition, the stress check update unit 420 is driven to update the image cumulative stress indices (ASTd) and the aging cumulative stress indices (ASTg) stored in the cumulative stress storage unit 410 .

The stress confirmation update unit 420 more specifically includes a unit stress confirmation means 421 and a stress adding means 423 .

The unit stress checking means 421 identifies and generates the original image data DATQRd of each of the plurality of display pixels PIXd as the image unit stress index USTd. Also, the unit stress checking means 421 identifies and generates the original aging data DATQRg of each of the plurality of aging pixels PIXg as the aging unit stress index USTg.

The stress adding means 423 adds the image unit stress index USTd of each of the plurality of display pixels PIXd to update the image cumulative stress index ASTd. In addition, the stress adding means 423 updates the aging cumulative stress index ASTg by adding the aging unit stress index USTg of each of the plurality of aging pixels PIXg.

6 , the correlation checking unit 430 checks the correlation between the aging cumulative stress index (ASTg) of each of the plurality of aging pixels (PIXg) and the deterioration sensing value (VSEN), and , to generate sensing correlation information (IFSN), which is information on this.

The deterioration compensation unit 440 stores the deterioration correlation information IFDE. In this case, the deterioration correlation information IFDE is updated by the sensing correlation information IFSN.

In addition, the degradation compensation unit 440 calculates the degradation confirmation value FVA for the standard cumulative stress index PRST corresponding to the image cumulative stress index ASTd of each of the plurality of display pixels PIXd. Based on the respective original image data DATQRd, deterioration compensation is performed to generate the respective image driving data DATDRd.

In addition, the deterioration compensation unit 440 calculates the deterioration confirmation value (FVA) for the standard cumulative stress index (PRST) corresponding to the aging cumulative stress index (ASTg) of each of the plurality of aging pixels (PIXg). Based on the respective original aging data DATQRd, deterioration compensation is performed to generate the respective aging driving data DATDRg.

FIG. 8 is a diagram illustrating the deterioration compensation unit 440 of FIG. 6 in more detail. Referring to FIG. 8 , the deterioration compensating unit 440 includes a deterioration lookup table 441 , a check value amplifying unit 443 , and a deterioration compensating unit 445 .

The degradation lookup table 441 stores the degradation correlation information IFDE. In this case, the deterioration lookup table 441 is the image cumulative stress index ASTd of each of the plurality of display pixels PIXd and the aging cumulative stress index ASTg of each of the plurality of aging pixels PIXg. and output the corresponding deterioration confirmation value (FVA).

The confirmation value amplifying means 443 amplifies the deterioration confirmation value (FVA) output from the deterioration lookup table 441 at a predetermined amplification rate (eg, '10') to generate an amplification confirmation value (PVA). . In this way, by amplifying the deterioration confirmation value FVA, the deterioration compensation by the deterioration compensating means 445 becomes easy.

The deterioration compensation means 445 is generated as the image driving data DATDRd of each of the plurality of display pixels PIXd by compensating for deterioration of the original image data DATQRd of each of the plurality of display pixels PIXd do. In addition, the deterioration compensating unit 445 compensates for deterioration of the original aging data DATQRg of each of the plurality of aging pixels PIXg to obtain the aging driving data DATDRg of each of the plurality of aging pixels PIXg. occurs with

In this case, the deterioration compensation for the original aging data DATQRd and the original aging data DATQRg in the deterioration compensation means 445 is the respective amplification confirmation value (PVA) output from the deterioration lookup table 441 . performed based on

Then, the data setting signal generating unit 450 generates the data setting signal XDASET. In this case, the case in which the data setting signal XDASET is activated is the same as described above with reference to FIG. 5 . And, since the implementation of the data setting signal generating unit 450 is easy for those skilled in the art, in the present specification, detailed description thereof will be omitted.

Subsequently, deterioration compensation for the original image data DATQRd of the display pixel PIXd<i> will be described.

FIG. 9 is a diagram for explaining an example of compensation for deterioration of the original image data DATQRd of the display pixel PIXd<i> of FIG. 1 .

For example, the image cumulative stress index (ASTd<i>) of the display pixel (PIXd<i>) (where i is a natural number greater than or equal to 1 and less than or equal to n) corresponds to the standard cumulative stress index (RPST) of '20'. Then, it is confirmed that the deterioration confirmation value FVA of the display pixel PIXd<i> is 0.13V. And, the amplification confirmation value (PVA) is '1.3V'.

In this case, the degradation compensation value CVA for the display pixel PIXd<i> is identified as '13'.

In this case, if the data value of the original image data DATQRd of the display pixel PIXd<i> is '142', the image driving data DATDRd is determined as '155=(142+13)'.

10 is a flowchart for explaining the driving of the organic light emitting display device of the present invention. Referring to FIG. 10 , the driving of the organic light emitting display device of the present invention is summarized as follows.

First, in step S100 , as the deterioration sensing operation proceeds, the deterioration sensing value VSEN of the aging pixels PIXg is extracted.

In operation S200 , original image data DATQRd of the display pixels PIXd is generated as image driving data DATDRd based on the extracted deterioration sensing value VSEN of the aging pixels PIXg.

Then, in step S300 , as the image display operation proceeds, the display pixels PIXd are light-accessed according to the image driving data DATDRd.

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible from the above description by those skilled in the art.

For example, in this specification, for various ˜data, ˜stress index, etc., an embodiment in which a flow for display pixels and a flow for aging pixels proceed separately has been shown and described.

However, the technical idea of the present invention can be implemented by an embodiment in which the various ˜data, ˜stress index, etc. flow in one flow, that is, a flow related to display pixels followed by a flow related to aging pixels serially. It is obvious to those skilled in the art.

Also, in the present specification, in relation to the degradation compensation method, a degradation compensation value CVA is generated according to the degree of degradation, and the generated degradation compensation value CVA is added to the original image data DATQRd to obtain the image driving data DATDRd. An embodiment that produces with

However, the technical idea of the present invention relates to an embodiment in which an amplification ratio is generated according to the degree of degradation in relation to the degradation compensation method, and the generated amplification ratio is multiplied by the original image data (DATQRd) to generate the image driving data (DATDRd). It is apparent to those skilled in the art that it can also be implemented by

Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (4)

In the organic light emitting display device having a deterioration compensation function,
In an image display operation, an image display block in which a plurality of display pixels driven to display an image are arranged for each frame, wherein each of the plurality of display pixels is light-emitted according to respective image driving data in the image display operation the video display block;
an aging display block in which a plurality of aging pixels are arranged, wherein each of the plurality of aging pixels is driven to read a respective deterioration sensing value, which is an electrical component reflecting a degree of deterioration thereof in a deterioration sensing operation; and
A deterioration compensation control block that stores deterioration correlation information indicating a deterioration confirmation value for each of a plurality of standard cumulative stress indices, wherein the deterioration correlation information is updated depending on the deterioration sensing value of each of the plurality of aging pixels, and the deterioration compensation control block providing the respective image driving data by compensating for deterioration of the original image data of each of the plurality of display pixels according to the deterioration correlation information;
The deterioration compensation for the original image data is
It is performed depending on the deterioration confirmation value of the standard cumulative stress index corresponding to the image cumulative stress index of the display pixel corresponding to the display pixel, wherein the image cumulative stress index represents the cumulative stress of the display pixel corresponding to itself,
Each of the plurality of aging pixels of the aging display block is
Driven so as to be deteriorated by reflecting the data values of the image driving data of the plurality of display pixels corresponding to the image display block in each frame, in order to generate the deterioration correlation information, data values of different image driving data are used. An organic light emitting display device, characterized in that it is driven to deteriorate.
The method of claim 1 , wherein each of the plurality of aging pixels comprises:
In the image display operation in which the deterioration sensing operation is not performed, light emission is accessed according to respective aging driving data,
The deterioration compensation control block is
an aging data generator configured to generate original aging data of each of the plurality of aging pixels based on the original image data of each of the plurality of display pixels; and
a deterioration compensation control unit configured to store the deterioration correlation information, wherein the original image data of each of the plurality of display pixels is compensated for deterioration by using the deterioration correlation information to generate the image driving data of each of the plurality of display pixels; , a deterioration compensation control unit that is generated as the aging driving data of each of the plurality of aging pixels by compensating for deterioration of the original aging data of each of the plurality of aging pixels;
The deterioration compensation for the original aging data is
is performed depending on the deterioration confirmation value of the standard cumulative stress index corresponding to the aging cumulative stress index of the aging pixel corresponding thereto;
The aging cumulative stress index is
The organic light emitting display device, characterized in that it represents the cumulative stress of the aging pixel corresponding to itself.
According to claim 1, wherein each of the plurality of aging pixels of the aging display block
In the image display operation, light is emitted according to each aging driving data,
The aging driving data of each of the plurality of aging pixels is
The organic light emitting display device, characterized in that determined based on the original image data of each of the plurality of display pixels.
4. The method of claim 3,
The aging driving data of each of the plurality of aging pixels is
generated by compensating for deterioration of the original aging data of each of the plurality of aging pixels;
The original aging data of each of the plurality of aging pixels is
The organic light emitting display device according to claim 1, wherein the display is generated based on the original image data of each of the plurality of display pixels.

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