JP2007187761A - Self-luminous display, estimated degradation information correction device, input display data correction device, and program - Google Patents

Self-luminous display, estimated degradation information correction device, input display data correction device, and program Download PDF

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JP2007187761A
JP2007187761A JP2006004263A JP2006004263A JP2007187761A JP 2007187761 A JP2007187761 A JP 2007187761A JP 2006004263 A JP2006004263 A JP 2006004263A JP 2006004263 A JP2006004263 A JP 2006004263A JP 2007187761 A JP2007187761 A JP 2007187761A
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correction
measurement
deterioration amount
pixel
dummy pixel
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JP4946062B2 (en
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Junji Ozawa
Mitsuru Tada
Katsuhide Uchino
勝秀 内野
満 多田
淳史 小澤
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Sony Corp
ソニー株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that precision is not guaranteed in suppressing or improving the burn-in of displays. <P>SOLUTION: One detector sensor is provided for each dummy pixel group at outside the effective display area to continuously control the dummy pixel to emit light at the same gradation level for the input display data of the reference pixel. Then, periodically measuring the light emitted by this dummy pixel, the latest accumulated degradation information is obtained for the measured section. The estimation of the accumulated degradation information calculated for the measured section is corrected, based on this measurement. In result, the burn-in correction value is decided following the actual measurements to increase the reliability. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The invention described in this specification relates to a technique for correcting an estimated value of deterioration information calculated based on input display data based on an actual measurement value of deterioration information.
The invention proposed by the inventors has aspects such as a self-luminous display device, an estimated deterioration information correction device, an input display data correction device, and a program.

  Flat panel displays are widely used in computer displays, portable terminals, television receivers and other electronic devices. At present, liquid crystal display panels are mainly used for flat panel displays. However, it has been pointed out that the liquid crystal display panel still has a narrow viewing angle and a slow response speed.

For this reason, the appearance of a flat panel display replacing the liquid crystal display panel is expected.
The most promising candidate is an organic EL display panel in which organic EL elements are arranged in a matrix. The organic EL display panel not only has a good viewing angle and responsiveness, but also has excellent characteristics such as no backlight, high brightness, and high contrast.

By the way, it is generally known that the self-luminous elements constituting the organic EL display panel have a characteristic of deteriorating in proportion to the light emission amount and time.
On the other hand, the content of the image displayed on the flat panel display is not uniform. For this reason, deterioration of the light emitter (organic EL element) is likely to partially proceed. For example, the light emitter located in the time display area is more rapidly deteriorated than the light emitters in the other display areas.

The luminance of the light-emitting body that has deteriorated is relatively lowered as compared with the luminance of other display areas. In general, this phenomenon is called “burn-in”. Hereinafter, partial deterioration of the light emitter is referred to as “burn-in”.
Various methods have been proposed for improving “burn-in”. In order to correct burn-in with high accuracy and high performance, it is necessary to correctly detect the actual deterioration state of the light emitter.

Therefore, all the measures for improving the burn-in performed without detecting the deterioration state merely suppress the occurrence of the burn-in.
JP 2003-228329 A JP 2000-132139 A JP 2003-509728 A

  Among these, Patent Literature 1 and Patent Literature 2 disclose a technique for predicting a deterioration state of a light emitter by an integrated value of input display data (gradation value) and correcting the input display data based on the prediction result. That is, these patent documents disclose a technique for correcting burn-in based on a predicted value of deterioration characteristics. For this reason, there is a possibility that burn-in will not be eliminated even after correction based on the prediction result.

  The main factor is that the deterioration characteristics of the light emitter cannot be uniformly determined only by the input gradation value. For example, various conditions such as the surrounding environment, the driving method, the luminance condition, the heat generation condition, and the degree of deterioration have a complicated influence. Moreover, it is necessary to consider individual errors between organic EL display panels. Thus, it is virtually impossible to predict the deterioration state of the light emitter by accurately associating all the conditions.

  On the other hand, in the technique disclosed in Patent Document 3, the deterioration characteristics of the light emitter can be detected with high accuracy by the light detection element arranged in the pixel circuit. However, disposing a correction circuit using a photodetection element for each pixel increases the number of transistors per pixel, which is disadvantageous in reducing production yield and increasing resolution.

  Therefore, the inventors actually measured the deterioration state of the effective display area through the deterioration state of the dummy pixels arranged outside the effective display area, and calculated the section deterioration amount calculated in the luminance deterioration measurement section based on the detection result. A mechanism for correcting information and a mechanism for determining a correction value corresponding to each pixel based on the corrected section deterioration amount information are proposed.

(Mechanism 1)
First, as a mechanism for correcting the section deterioration information, a method of mounting the following processing functions is proposed.
(A) In the luminance degradation measurement section, the same gradation value as that of the reference pixel is given to the dummy pixel arranged outside the effective display area, while the measurement gradation value is used for the luminance degradation measurement timing. Dummy pixel data determination process to be given to the dummy pixel (b) Section degradation amount calculation process to calculate an estimated value of the section degradation amount corresponding to each measurement section based on the gradation value given to the dummy pixel (c) Each measurement Section degradation amount actual measurement processing for measuring the actual measurement value of the section degradation amount corresponding to the section based on the detected luminance of the luminance detection sensor (d) A correction coefficient for the estimated value for the actual measurement value is determined, and each of the effective display areas Estimated accuracy correction processing for correcting the section deterioration amount information calculated for the pixel based on the correction coefficient

(Mechanism 2)
In addition, as a mechanism for determining a correction value corresponding to each pixel based on the corrected section deterioration amount information, a method of mounting a processing function shown below is proposed.
(A) Dummy pixel data determination processing in which the same gradation value as that of the reference pixel is given to the dummy pixel in the luminance degradation measurement section, while the measurement gradation value is given to the dummy pixel at the luminance degradation measurement timing ( b) Section deterioration amount calculation processing for calculating an estimated value of the section deterioration amount corresponding to each measurement section based on the gradation value given to the dummy pixel. (c) An actual measurement value of the section deterioration amount corresponding to each measurement section. , Section degradation amount actual measurement processing measured based on the detected brightness of the luminance detection sensor (d) Determines a correction coefficient of the estimated value for the actual measurement value, and corrects the section degradation amount information calculated for each pixel in the effective display area (E) Correction amount determination processing for determining a correction amount corresponding to each pixel based on the corrected section deterioration amount information (f) Based on the determined correction amount There, the video signal correction processing for correcting the input tone value corresponding to the effective display region

  In the invention proposed by the inventors, the deterioration state of the effective display area is actually measured through the deterioration state of the dummy pixels arranged outside the effective display area, and the section calculated as the measurement section of the luminance deterioration based on the detection result The deterioration amount information is corrected to follow the actual value. As a result, the correction accuracy of the input display data is improved, and the burn-in phenomenon can be reliably suppressed or improved.

Hereinafter, embodiments of the self-luminous display device according to the invention will be described.
In addition, the well-known or well-known technique of the said technical field is applied to the part which is not specifically illustrated or described in this specification.
Moreover, the form example demonstrated below is one form example of invention, Comprising: It is not limited to these.

(A) Technology for accurately reflecting fluctuations in light emission characteristics when estimating the deterioration amount (A-1) Basic concept The gradation value and the deterioration amount are not necessarily in a proportional relationship. This is because the organic EL element has a characteristic that the light emission characteristic changes due to the characteristic error between panels, the environmental temperature, the light emission temperature of the panel surface, and the like.
For this reason, even if the gradation value is cumulatively added for each pixel, the deterioration amount of the corresponding pixel cannot be accurately estimated.

In view of this, the inventors propose a mechanism for measuring the temporal variation of the light emission characteristics of the organic EL element and reflecting the measurement result in the estimation of the deterioration amount.
FIG. 1 shows the variation of the deterioration rate (rate) due to the difference in the light emission point. FIG. 1 shows temporal changes in light emission luminance in the case where lighting of a light emitter constituting a certain pixel is controlled with a constant gradation value. A curve D APL represents a deterioration curve when lighting control is performed on a certain pixel (for example, a dummy pixel for measuring deterioration characteristics) with an average gradation value of the entire screen.

An arrow D 100 shown in FIG. 1 indicates a progress rate (deterioration rate) of luminance degradation when a gradation value of 100% signal level is given to a pixel. As can be seen by comparing the slope of the arrow D 100 with the time point t1 as the base point and the slope of the arrow D 100 with the time point t2 as the base point, even when the light emission of a certain pixel is controlled by the same gradation value, If the brightness deterioration is different, the deterioration speed is not the same.
If the deterioration rate is different, the amount of deterioration occurring in the corresponding period is different even if the light emission time length is the same.

An example is shown in FIG. In the figure, the amount of deterioration occurring in period 1 (time points t1 to t2) is denoted as ΔR (t1-t2), and the amount of deterioration occurring in period 2 (time points t2 to t3) is denoted as ΔR (t2-t3). The period 1 and the period 2 shown in the figure are both the same time length, but their sizes are different.
Therefore, the inventors adopt a method of periodically measuring the change in the deterioration amount and appropriately correcting the deterioration amount estimated from the gradation value.

(A-2) Configuration Example of Display Panel FIG. 3 shows a configuration example of the organic EL panel module. FIG. 3 is a diagram mainly showing from the viewpoint of pixel arrangement, and the drive circuit and other peripheral circuits are omitted.
The organic EL panel module 1 includes an effective display area 31 and a dummy pixel area 33.
The effective display area 31 is an area where light emission can be observed from the outside. On the other hand, the dummy pixel region 33 is a light-shielded region so that light emission is not observed from the outside, and is disposed outside the effective display region 31.

  In the case of FIG. 3, the effective display area 31 is from the first line to the n-th line, and the dummy pixel area 33 is the n + 1-th line. In this example, each dummy pixel is controlled to emit light during the blanking period. As shown in FIG. 3, the display panel proposed by the inventors can be realized only by adding one selection line (gate drive line) to a general display panel. That is, the dummy pixel area 33 may have the same structure as each pixel in the effective display area 31, and an existing drive circuit can be used. That is, a dedicated drive circuit or a large-scale drive circuit is not required for driving the dummy pixels.

FIG. 4 shows an example of the structure of the dummy pixel that constitutes the dummy pixel region 33. The dummy pixels have the same structure as the display pixels in the effective display area, and are configured by unit dummy pixels corresponding to red (R), green (G), and blue (B).
The light emission luminance of each unit dummy pixel is detected by the luminance detection sensor 7. In the case of FIG. 4, one luminance detection sensor 7 is arranged so as to cover the entire display pixel. However, it can be arranged so as to face each unit dummy pixel constituting the three luminance detection sensors 7, or can be arranged in each unit dummy pixel.

  In the case of this embodiment, a visible light sensor using an amorphous silicon semiconductor is used as the light detection element constituting the luminance detection sensor 7. The luminance detection sensor 7 amplifies light amount information detected as a current value, converts it into a voltage value, and outputs it as a light detection signal.

(B) Preferred Embodiment Hereinafter, an embodiment of an organic EL display device that employs the above-described degradation characteristic updating technique will be described.
(A) System Configuration FIG. 5 shows an outline of a system configuration example of the organic EL display device 11 described in this embodiment. The organic EL display device 11 includes an organic EL panel module 13, an input display data correction unit 15, and an estimated deterioration amount correction unit 17.

The organic EL panel module 13 employs the configuration shown in FIG.
The input display data correction unit 15 sets the light emission luminance of each pixel to the light emission of the reference pixel when the deterioration amount of each pixel constituting the effective display area 131 is equal to the deterioration amount of the reference pixel or when the input gradation value is the same. A process of individually correcting the input display data so as to match the luminance is executed. Here, the reference pixel is assumed to be a pixel whose light emission is continuously controlled with the average gradation value of the input display data.
The estimated deterioration amount correcting unit 17 executes a process of generating dummy pixel data and a process of correcting the estimated deterioration amount of the input display data correcting unit 15 based on the actual measurement result of the dummy pixels.

(B) Configuration of Input Display Data Correction Unit FIG. 6 shows a detailed configuration example of the input display data correction unit 15. The input display data correction unit 15 includes a gradation value / deterioration amount conversion table 151, a deterioration amount calculation unit 153, a deterioration amount difference calculation unit 155, a pre-correction interval deterioration amount difference accumulation unit 157, a cumulative deterioration amount difference accumulation unit 159, and a correction. The amount determining unit 161 and the video signal correcting unit 163 are configured.

  The gradation value / degradation amount conversion table 151 is a table for converting input display data (gradation value) into a deterioration amount. The reason why the conversion table is used is that the progress of the deterioration of the organic EL element is not proportional to the gradation value as described above. FIG. 7 shows an example of the gradation value / degradation amount conversion table 151. In the gradation value / degradation amount conversion table 151, all gradation values that can be taken by the input display data and the corresponding degradation amounts are stored in association with each other. The deterioration amount R is given as the product of the deterioration rate (deterioration rate) corresponding to each gradation value and the light emission period t. The light emission period t may be fixed or variable.

  The degradation amount calculation unit 153 refers to the gradation value / degradation amount conversion table 151 and performs processing for converting the input display data (gradation value) corresponding to each pixel (including dummy pixels) into the corresponding degradation amount. The processing device to be executed. The deterioration amount calculation unit 153 outputs the deterioration amount calculated for each pixel constituting the effective display area to the deterioration amount difference calculation unit 155, and outputs the deterioration amount calculated for the dummy pixel to the dummy pixel section deterioration amount calculation unit 177. Output.

The deterioration amount difference calculation unit 155 is a processing device that calculates a difference (deterioration amount difference) between the deterioration amount calculated for the reference pixel and the deterioration amount calculated for each pixel. The deterioration amount difference calculation unit 155 adds the deterioration amount difference to the section deterioration amount difference held in the pre-correction section deterioration amount difference accumulation unit 157 every time the deterioration amount difference is newly calculated.
The pre-correction interval deterioration amount difference accumulation unit 157 is a storage device that accumulates cumulative values of deterioration amount differences that occur in each measurement interval. The accumulated value of the accumulated deterioration amount difference is corrected by the correction coefficient given from the estimation accuracy correcting unit 179 at the end of the measurement section, and is output to the accumulated deterioration amount difference accumulating unit 159. After this output, the deterioration amount difference accumulated in the pre-correction interval deterioration amount difference accumulation unit 157 is reset (cleared) for the next measurement interval.

The accumulated deterioration amount difference accumulation unit 159 is a storage device that accumulates the accumulated deterioration amount difference for each pixel calculated from the start of light emission to the end of the previous measurement section. Of course, the stored value here is stored for each basic emission color.
The correction amount determination unit 161 is a processing device that determines a correction value corresponding to each pixel based on a cumulative deterioration amount difference. In the case of this embodiment, the correction amount determination method is a method for determining a correction value so that there is no difference from the cumulative deterioration amount of the reference pixel, or when the input gradation value is the same, the emission luminance of each pixel is the reference. A method of determining a correction value so as to match the light emission luminance of the pixel is applied.

  The video signal correction unit 163 functions as a processing device that executes processing for converting input display data into corrected display data. In the case of this embodiment, the video signal correction unit 163 converts the input display data to the corrected display data by adding / subtracting the correction value corresponding to each pixel to / from the input display data corresponding to each pixel in the effective display area. . The correction value is given from the correction amount determination unit 161. The corrected display data after conversion is provided to the deterioration amount calculation unit 153 and the dummy pixel determination unit 175. The video signal correction unit 163 also executes a process of multiplexing the pixel data for dummy pixels (that is, dummy pixel data) given from the dummy pixel data determination unit 175 at the corresponding position of the input display data.

(C) Configuration of Estimated Degradation Amount Correction Unit FIG. 6 shows a detailed configuration example of the estimated degradation amount correction unit. The estimated deterioration amount correction unit 17 includes a dummy pixel light emission detection unit 171, a section deterioration amount actual measurement unit 173, a dummy pixel data determination unit 175, a dummy pixel section deterioration amount calculation unit 177, and an estimation accuracy correction unit 179.
The dummy pixel light emission detection unit 171 is a processing device that detects the light emission luminance of the dummy pixel at each measurement timing. The dummy pixel light emission detection unit 171 corresponds to the luminance detection sensor 7 shown in FIG.

  The section deterioration amount actual measurement unit 173 calculates a cumulative deterioration amount ΔR newly generated in the current measurement section based on a difference value between the light emission brightness measured at the immediately previous measurement timing and the light emission brightness measured at the current measurement timing. A processing device to measure. The measured cumulative deterioration amount ΔR is output to the estimated accuracy correction unit 179. Further, the section deterioration amount actual measurement unit 173 manages the measurement timing, and designates the dummy pixel data determination unit 175 as the output timing of the dummy pixel data for measurement.

  The dummy pixel data determination unit 175 is a processing device that determines dummy pixel data. In the measurement section (section other than the measurement timing), a reference gradation value that reflects the light emission information of the entire effective display area is calculated based on the corrected display data, and is output to the video signal correction unit 163 as dummy pixel data. For example, the average gradation value of the entire screen is output. The average gradation value is calculated for each basic emission color.

Further, at the measurement timing, a preset gradation value for measurement is output to the video signal correction unit 163 as dummy pixel data. For example, a gradation value corresponding to a 100% luminance value is output. The gradation value for measurement basically uses the same value. However, it is possible to change to a different value during use.
FIG. 8 shows a transition example of the dummy pixel data example.

  The dummy pixel section deterioration amount calculation unit 177 is a processing device that inputs the deterioration amount estimated for the dummy pixel data from the deterioration amount calculation unit 153 and performs cumulative addition. However, the calculated cumulative addition value is reset (cleared) after the measurement interval ends and is read by the estimation accuracy correction unit 179. For this reason, the dummy pixel section deterioration amount calculation unit 177 always holds only the cumulative deterioration amount of dummy pixels newly estimated in the measurement section.

  The estimation accuracy correction unit 179 compares the estimated value of the cumulative deterioration amount calculated in each measurement section with the actual measurement every time the measurement section ends, and calculates a correction coefficient for matching the estimated value with the actual measurement value Is a processing device for executing The calculated correction coefficient is output to the pre-correction interval deterioration amount difference accumulation unit 157. In this way, the estimation accuracy correction unit 179 realizes a function for uniformly correcting estimation errors occurring in all the pixels calculated within the measurement section.

(D) Correction Operation for Cumulative Degradation Amount Difference Hereinafter, an operation example for correcting the cumulative deterioration amount difference employed in this embodiment will be described.
As shown in FIG. 9, the light emission luminance of the dummy pixel decreases nonlinearly with the usage time length of the organic EL panel module. Since the dummy pixels are controlled to emit light at an average gradation value in the effective display area, the dummy pixels accurately represent the average luminance deterioration of the entire effective display area.
The estimation accuracy correction unit 179 compares the estimated value of the accumulated deterioration amount ΔR with the actual measurement value for each measurement section shown in FIG. 9 and determines a correction coefficient to be given to the pre-correction section deterioration amount difference accumulation unit 157.

  FIG. 10 shows a state in which the estimated value of the accumulated deterioration amount is sequentially corrected by the correction coefficient. As shown in FIG. 10, when the correction process is not executed for each measurement section, a very large estimation error occurs at the time point t3. In the prior art, since the correction value for burn-in correction is determined ignoring the occurrence of such an estimation error, it is inevitable that the correction accuracy of the burn-in phenomenon is lowered.

FIG. 11 shows the correspondence relationship between the section cumulative deterioration amount before and after correction and the correction coefficient over the entire section.
FIG. 12 shows the relationship between the estimated value and the actual measurement value corresponding to the first measurement interval (interval up to t1). FIG. 12 shows an example in which the estimated value of the cumulative deterioration amount is given as a b% luminance drop, and the actual measurement value of the cumulative deterioration amount is given as a% luminance drop. In this case, the correction coefficient is given as a / b.
This correction coefficient is multiplied by the section deterioration amount difference R1 before correction. In this example, the interval deterioration amount difference is corrected to a value R1 ′ smaller than that before the correction. The corrected section deterioration amount difference is stored in the cumulative deterioration amount difference storage unit 159 and is referred to for determining the correction amount.

FIG. 13 shows the relationship between the estimated value and the actual measurement value corresponding to the next measurement interval (interval between t1 and t2). FIG. 13 shows an example in which the estimated value of the cumulative deterioration amount is given as a d% luminance drop, and the measured value of the cumulative deterioration amount is given as a c% luminance drop. In this case, the correction coefficient is given as c / d.
FIG. 14 shows the relationship between the estimated value and the actually measured value corresponding to the next measurement interval (interval of t2 to t3). FIG. 14 shows an example in which the estimated value of the cumulative deterioration amount is given as a luminance reduction of f% and the actual measurement value of the cumulative deterioration amount is given as a luminance reduction of e%. In this case, the correction coefficient is given as e / f.

In any measurement interval, the correction coefficient is multiplied by the interval deterioration amount difference R2 and R3 before correction. In this example, the section deterioration amount difference is corrected to values R2 ′ and R3 ′ that are smaller than those before correction. Then, the corrected difference in each section amount is added to the accumulated deterioration amount difference accumulated in the accumulated deterioration amount difference accumulation unit 159 until the previous measurement section, and is referred to for determining the correction amount in the subsequent period.
12 to 14 all show the case where the actual measurement value of the cumulative deterioration amount is smaller than the estimated value, but this relationship may be reversed. Even in this case, the correction coefficient is calculated based on the correspondence described above.

For reference, FIG. 15 and FIG. 16 schematically show how the correction accuracy is improved by the above-described correction operation.
FIG. 15 corresponds to an operation example when the correction amount determination unit 161 performs a correction operation so that the deterioration amount of each pixel matches the deterioration amount of the reference pixel. The solid line in the figure indicates the actual deterioration characteristic, and the broken line indicates the deterioration characteristic when the estimated value is not corrected.

  When it is determined that the deterioration of the correction target pixel (broken line) is advanced by 5% with respect to the deterioration of the reference pixel to be matched (broken line), the conventional method stops the light emission of the correction target pixel for the scheduled correction period. Such a control operation is executed. As indicated by the broken line, the deterioration characteristic of the correction target pixel should match the deterioration characteristic of the reference pixel at the end of the correction period.

However, when the degradation characteristic estimation accuracy is poor and the difference in degradation amount between the correction target pixel and the reference pixel at the start of correction is actually 3% as indicated by the solid line in FIG. 15, the emission of the correction target pixel is stopped. Thus, at the end of the correction period, the deterioration of the reference pixel proceeds in contrast to the correction start time. Thus, if there is a problem in the estimation accuracy of the accumulated deterioration amount difference, the correction operation cannot exhibit the original effect (improving burn-in).
However, if the method proposed by the inventors is adopted, the accumulated deterioration amount is sequentially corrected so as to match the actual accumulated deterioration amount, so that the deterioration amount of the correction target pixel is more accurate than the deterioration amount of the reference pixel. It is possible to match well, and it becomes possible to improve the burn-in at the end of the correction.

16 illustrates an operation example when the correction amount determination unit 161 executes a correction operation so that the light emission luminance of each pixel is equal to the light emission luminance of the reference pixel when the input gradation values are the same. This also shows a case where it is determined that the deterioration of the correction target pixel (broken line) is advanced by 5% with respect to the deterioration of the reference pixel (broken line) to be matched. In this case, in the conventional method, a control operation that increases the light emission luminance of the correction target pixel by 5% is executed. As indicated by the broken line, the light emission luminance of the correction target pixel should match the light emission luminance of the reference pixel by executing this correction operation.

However, when the estimation accuracy of the deterioration characteristics is poor and the difference in deterioration amount between the correction target pixel and the reference pixel at the start of correction is actually 3% as indicated by a solid line in FIG. 16, the emission luminance of the correction target pixel is 5%. When it is raised, it becomes 2% larger than the light emission luminance of the reference pixel. Thus, if there is a problem in the prediction accuracy of the deterioration amount, the correction operation cannot exhibit the original effect (improving burn-in).
In this case as well, if the method proposed by the inventors is adopted, the cumulative deterioration amount is sequentially corrected so as to match the actual cumulative deterioration amount, so the light emission luminance of the correction target pixel becomes the light emission luminance of the reference pixel. On the other hand, it is possible to match with high accuracy, and it is possible to improve the burn-in at the end of the correction.

(E) Effect of Embodiment As described above, in the organic EL display device according to this embodiment, dummy pixels are arranged outside the effective display area, and the degradation state is actually measured and estimated from the gradation value. Correct the accumulated deterioration amount. Therefore, the cumulative deterioration amount difference accumulation unit 159 stores only the cumulative deterioration amount difference that accurately reflects the actual deterioration state. As a result, an improvement in the reliability of the correction amount determined by the correction amount determination unit 161 can be ensured over a long period of time.

  Thus, it becomes possible to realize an organic EL display device in which the image sticking phenomenon hardly occurs even when used for a long time or the image sticking phenomenon can be improved. The present invention is also effective for individual errors between display panels because the accumulated deterioration amount difference is corrected according to the actual measurement value.

Of course, since these effects can be realized only by simple signal processing using the actual measurement result, it is possible to eliminate the need for an enormous prior experiment in consideration of all events such as changes over time as in the prior art. For this reason, the manufacturing cost can be significantly reduced.
Further, since the processing method described in the embodiment has simple control contents, it can be realized at low cost even when the screen size is increased.
Further, the dummy pixel can be manufactured with exactly the same pixel configuration as the effective display area, and does not require a complicated circuit configuration dedicated to the dummy pixel or a special control operation. This is also advantageous in terms of reduction in circuit scale and production difficulty.

(C) Other Embodiments (a) In the above embodiment, the case where the basic emission colors are three colors of RGB has been described. However, the basic emission colors can also be applied to the case where there are four or more colors including complementary colors. In this case, as many dummy pixels as the number of the basic emission colors may be prepared.
(B) In the above-described embodiment, the color generation form of the basic light emission color has not been described. However, an organic EL element having a different light emitting element material for each basic light emission color may be prepared. It may be used to generate a basic emission color.

(C) In the above-described embodiment, the case where one dummy pixel corresponding to the display pixel is arranged on the self-luminous panel has been described. Further, the case where one new gate drive line is added for driving the dummy pixel has been described. However, the number and positions of the dummy pixels to be arranged are arbitrary, and an optimum number of data driving lines and gate driving lines may be prepared according to the number and positions of the dummy pixels to be arranged.

(D) In the above-described embodiment, the organic EL display panel is illustrated as an example of the self-luminous display device, but the present invention can also be applied to other self-luminous display devices. For example, the present invention can be applied to FED (field emission display), inorganic EL display panel, LED panel, and the like.

(E) In the above-described embodiment, a case has been described in which the accumulated deterioration amount difference between the reference pixel and each pixel is corrected with the correction coefficient.
However, the absolute cumulative deterioration amount for each pixel may be corrected with a correction coefficient. In this specification, the cumulative deterioration amount information and the cumulative deterioration amount difference described above are referred to as cumulative deterioration amount information.

(F) In the above-described embodiment, the organic EL display device that has a function of correcting the estimated value of the cumulative deterioration amount calculated based only on the gradation value based on the actual measurement value has been described.
However, the function for correcting the accumulated deterioration amount may be implemented as a part of an image processing apparatus equipped with a self-luminous display device. For example, the correction function of the estimated accuracy correction unit 179 includes a video camera, a digital camera, and other imaging devices (including not only a camera unit but also an integrated configuration with a recording device), an information processing terminal (portable type). (Computer, mobile phone, portable game machine, electronic notebook, etc.), game machine, printer device, etc.

(G) In the above-described embodiment, the organic EL display device that has the function of correcting the estimated value of the cumulative deterioration amount calculated based only on the gradation value based on the actual measurement value has been described.
However, the function for correcting the accumulated deterioration amount may be installed in an image processing apparatus that supplies an input display data signal to a self-luminous display apparatus or an image processing apparatus equipped with the self-luminous display apparatus. In other words, a method may be employed in which the light emission luminance and deterioration information of the dummy pixels are taken into the self device from the self light emitting display device.

(H) In the above-described embodiment, the function for correcting the accumulated deterioration amount has been described from the viewpoint of the functional configuration. Needless to say, an equivalent function can be realized as hardware or software.
Further, not only all of these processing functions are realized by hardware or software, but some of them may be realized by using hardware or software. That is, a combination of hardware and software may be used.
(I) Various modifications can be considered for the above-described embodiments within the scope of the gist of the invention. Various modifications and applications created or combined based on the description of the present specification are also conceivable.

It is a figure explaining the fluctuation | variation with time of a deterioration rate. It is a figure explaining the difference in the amount of degradation of a measurement section unit. It is a figure which shows the plane structural example of a display panel. It is an enlarged view of a dummy pixel area. It is a figure which shows the system structural example of an organic electroluminescent display apparatus. It is a figure which shows the internal structural example of an input display data correction | amendment part and an estimated degradation amount correction | amendment part. It is a figure which shows the example of a gradation value / deterioration rate conversion table. It is a figure which shows the relationship between a measurement area and a measurement timing. It is a figure which shows the cumulative amount of degradation of a measurement area unit. It is a figure which shows the correction operation | movement principle. It is a graph explaining the correction operation | movement of a cumulative deterioration amount difference. It is a figure explaining the determination operation | movement of a correction coefficient. It is a figure explaining the determination operation | movement of a correction coefficient. It is a figure explaining the determination operation | movement of a correction coefficient. It is a figure which shows the example of correction | amendment operation | movement. It is a figure which shows the example of correction | amendment operation | movement.

Explanation of symbols

15 Input display data correction unit 17 Estimated deterioration amount correction unit 157 Pre-correction interval deterioration amount difference accumulation unit 159 Cumulative deterioration amount difference accumulation unit 173 Section deterioration amount actual measurement unit 177 Dummy pixel interval deterioration amount calculation unit 179 Estimation accuracy correction unit

Claims (5)

  1. A display panel in which dummy pixels are arranged outside the effective display area;
    A luminance detection sensor for detecting the emission luminance of the dummy pixel at the actual measurement timing of the luminance degradation;
    A dummy pixel data determination unit that provides the dummy pixel with the same gradation value as that of the reference pixel in the measurement period of the luminance deterioration, while providing a gradation value for measurement to the dummy pixel at the measurement timing of the luminance deterioration;
    A section deterioration amount calculation unit that calculates an estimated value of the section deterioration amount corresponding to each measurement section based on a gradation value given to the dummy pixel;
    A section deterioration amount actual measurement unit that measures an actual measurement value of the section deterioration amount corresponding to each measurement section based on the detection brightness of the brightness detection sensor;
    An estimation accuracy correction unit that determines a correction coefficient of the estimated value with respect to the actual measurement value, and corrects the section deterioration amount information calculated for each pixel in the effective display area based on the correction coefficient;
    A correction amount determination unit that determines a correction amount corresponding to each pixel based on the corrected section deterioration amount information;
    A self-luminous display device, comprising: a video signal correction unit that corrects an input gradation value corresponding to an effective display area based on the determined correction amount.
  2. An estimated deterioration information correction apparatus for correcting an estimated value of section deterioration amount information calculated based on input display data,
    In the luminance degradation measurement section, the same gradation value as that of the reference pixel is given to the dummy pixel arranged outside the effective display area, while the measurement gradation value is given to the dummy pixel at the luminance degradation measurement timing. A dummy pixel data determination unit to be given to
    A section deterioration amount calculation unit that calculates an estimated value of the section deterioration amount corresponding to each measurement section based on a gradation value given to the dummy pixel;
    A section deterioration amount actual measurement unit that measures an actual measurement value of the section deterioration amount corresponding to each measurement section based on the detection brightness of the brightness detection sensor;
    An estimation accuracy correction coefficient for the actual measurement value, and an estimation accuracy correction unit that corrects the section deterioration amount information calculated for each pixel in the effective display area based on the correction coefficient. Estimated deterioration information correction device.
  3. An apparatus for correcting input display data input to a display panel in which a dummy pixel and a detection sensor for detecting light emission luminance of the dummy pixel are disposed outside an effective display area,
    A dummy pixel data determination unit that provides the dummy pixel with the same gradation value as that of the reference pixel in the measurement period of the luminance deterioration, while providing a gradation value for measurement to the dummy pixel at the measurement timing of the luminance deterioration;
    A section deterioration amount calculation unit that calculates an estimated value of the section deterioration amount corresponding to each measurement section based on a gradation value given to the dummy pixel;
    A section deterioration amount actual measurement unit that measures an actual measurement value of the section deterioration amount corresponding to each measurement section based on the detection brightness of the brightness detection sensor;
    An estimation accuracy correction unit that determines a correction coefficient of the estimated value with respect to the actual measurement value, and corrects the section deterioration amount information calculated for each pixel in the effective display area based on the correction coefficient;
    A correction amount determination unit that determines a correction amount corresponding to each pixel based on the corrected section deterioration amount information;
    An input display data correction device comprising: a video signal correction unit that corrects an input gradation value corresponding to an effective display area based on the determined correction amount.
  4. A computer program for correcting an estimated value of section deterioration amount information calculated based on input display data,
    In the luminance degradation measurement section, the same gradation value as that of the reference pixel is given to the dummy pixel arranged outside the effective display area, while the measurement gradation value is given to the dummy pixel at the luminance degradation measurement timing. Dummy pixel data determination process to be given to
    A section deterioration amount calculation process for calculating an estimated value of a section deterioration amount corresponding to each measurement section based on a gradation value given to the dummy pixel;
    Section degradation amount actual measurement processing for measuring the actual measurement value of the section degradation amount corresponding to each measurement section based on the detection brightness of the brightness detection sensor;
    A computer program for determining a correction coefficient of an estimated value with respect to the actual measurement value and causing the computer to execute an estimation accuracy correction process for correcting the section deterioration amount information calculated for each pixel in the effective display area based on the correction coefficient .
  5. A computer program for correcting input display data input to a display panel in which a dummy pixel and a detection sensor for detecting light emission luminance of the dummy pixel are arranged outside the effective display area,
    A dummy pixel data determination process for providing the dummy pixel with the same gradation value as the reference pixel in the luminance degradation measurement section, while providing a measurement gradation value to the dummy pixel at the luminance degradation measurement timing;
    A section deterioration amount calculation process for calculating an estimated value of a section deterioration amount corresponding to each measurement section based on a gradation value given to the dummy pixel;
    Section degradation amount actual measurement processing for measuring the actual measurement value of the section degradation amount corresponding to each measurement section based on the detection brightness of the brightness detection sensor;
    Estimating accuracy correction processing for determining the correction coefficient of the estimated value with respect to the actual measurement value, and correcting the section deterioration amount information calculated for each pixel in the effective display area based on the correction coefficient;
    A correction amount determination process for determining a correction amount corresponding to each pixel based on the corrected section deterioration amount information;
    A computer program for causing a computer to execute a video signal correction process for correcting an input gradation value corresponding to an effective display area based on a determined correction amount.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120162285A1 (en) * 2010-12-28 2012-06-28 Sony Corporation Signal processing device, signal processing method, display device, and electronic apparatus
CN103871364A (en) * 2012-12-17 2014-06-18 乐金显示有限公司 Organic light emitting display device and method for driving thereof
WO2014188813A1 (en) * 2013-05-23 2014-11-27 ソニー株式会社 Video image signal processing circuit, method for processing video image signal, and display device
WO2015174077A1 (en) * 2014-05-15 2015-11-19 株式会社Joled Display device and method for driving display device
US9384696B2 (en) 2013-11-29 2016-07-05 Samsung Display Co., Ltd. Display device, method of calculating compensation data thereof, and driving method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004038210A (en) * 1997-03-12 2004-02-05 Seiko Epson Corp Display device and electronic equipment
JP2004146936A (en) * 2002-10-22 2004-05-20 Mitsubishi Electric Corp Color display apparatus
JP2005017520A (en) * 2003-06-24 2005-01-20 Matsushita Electric Ind Co Ltd El color display device
JP2007086294A (en) * 2005-09-21 2007-04-05 Pioneer Electronic Corp Plasma display apparatus and driving method for the same
JP2007515062A (en) * 2003-11-25 2007-06-07 イーストマン コダック カンパニー Aging compensation of OLED display
JP2007178837A (en) * 2005-12-28 2007-07-12 Matsushita Electric Ind Co Ltd Organic el display apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004038210A (en) * 1997-03-12 2004-02-05 Seiko Epson Corp Display device and electronic equipment
JP2004146936A (en) * 2002-10-22 2004-05-20 Mitsubishi Electric Corp Color display apparatus
JP2005017520A (en) * 2003-06-24 2005-01-20 Matsushita Electric Ind Co Ltd El color display device
JP2007515062A (en) * 2003-11-25 2007-06-07 イーストマン コダック カンパニー Aging compensation of OLED display
JP2007086294A (en) * 2005-09-21 2007-04-05 Pioneer Electronic Corp Plasma display apparatus and driving method for the same
JP2007178837A (en) * 2005-12-28 2007-07-12 Matsushita Electric Ind Co Ltd Organic el display apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8872867B2 (en) * 2010-12-28 2014-10-28 Sony Corporation Signal processing device, signal processing method, display device, and electronic apparatus
US20120162285A1 (en) * 2010-12-28 2012-06-28 Sony Corporation Signal processing device, signal processing method, display device, and electronic apparatus
US9715848B2 (en) 2012-12-17 2017-07-25 Lg Display Co., Ltd. Organic light emitting display device and method for driving thereof
CN103871364A (en) * 2012-12-17 2014-06-18 乐金显示有限公司 Organic light emitting display device and method for driving thereof
JP2014123126A (en) * 2012-12-17 2014-07-03 Lg Display Co Ltd Organic light-emitting display device and method for driving the same
CN105144273A (en) * 2013-05-23 2015-12-09 株式会社日本有机雷特显示器 Video image signal processing circuit, method for processing video image signal, and display device
KR20150114524A (en) 2013-05-23 2015-10-12 가부시키가이샤 제이올레드 Video image signal processing circuit, method for processing video image signal, and display device
WO2014188813A1 (en) * 2013-05-23 2014-11-27 ソニー株式会社 Video image signal processing circuit, method for processing video image signal, and display device
CN105144273B (en) * 2013-05-23 2017-06-23 株式会社日本有机雷特显示器 Imaging signal processing circuit, image-signal processing method and display device
JPWO2014188813A1 (en) * 2013-05-23 2017-02-23 株式会社Joled Video signal processing circuit, video signal processing method, and display device
US10354586B2 (en) 2013-05-23 2019-07-16 Joled Inc. Image signal processing circuit, image signal processing method, and display unit with pixel degradation correction
US9384696B2 (en) 2013-11-29 2016-07-05 Samsung Display Co., Ltd. Display device, method of calculating compensation data thereof, and driving method thereof
JPWO2015174077A1 (en) * 2014-05-15 2017-04-20 株式会社Joled Display device and driving method of display device
WO2015174077A1 (en) * 2014-05-15 2015-11-19 株式会社Joled Display device and method for driving display device

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