JP2007163712A - Display panel, self-luminous display device, gradation value/degradation rate conversion table updating device, input display data correction device, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately predict degraded states of all luminous bodies constituting a display panel through actually measured values about dummy pixels arranged on the outside of an effective display area. <P>SOLUTION: One detection sensor is arranged for a set of dummy pixels, on the outside of the effective display area. In this case, light emission of the dummy pixels is controlled by a preliminarily set gradation value at actual measurement timing of degradation information while light emission of the dummy pixels is continuously controlled by the gradation value of input display data corresponding to a reference pixel. Transition of light emission luminance actually measured by a luminance detection sensor at every actual measurement timing of degradation information is obtained for each fundamental emission color to obtain actually measured degradation information for each fundamental emission color. Thereafter, an actually measured degradation rate corresponding to an average gradation value is calculated on the basis of the average gradation value within an actual measurement period and actually measured degradation information, and a fundamental table defining a fundamental correspondence relation between gradation values and degradation rates is referred to, whereby actually measured degradation rates of all gradation values other than the average gradation value are calculated for each fundamental emission color. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The invention described in this specification relates to a technique for updating a gradation value / deterioration rate conversion table referred to for calculating deterioration information of each pixel.
The invention proposed by the inventors has aspects as a display panel, a self-luminous display device, a gradation value / deterioration rate conversion table update 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.
In addition, the method disclosed in Patent Document 3 has a correction method that only compensates for deteriorated luminance. As a result, the deterioration is promoted, and there is a problem that the limit of correction performance and the luminance half-life come relatively early. is there.

Therefore, the inventors propose a mechanism in which one or a plurality of sets of dummy pixels are arranged outside the effective display area, and the emission luminance of these dummy pixels is measured using one luminance detection sensor.
Further, the inventors propose the following mechanism for improving the prediction accuracy of deterioration information and correction information corresponding to each pixel based on the deterioration information actually measured through such a mechanism.

(Mechanism 1)
As an apparatus for updating a gradation value / deterioration rate conversion table that is referred to when calculating deterioration information, a device equipped with the following processing functions (a) to (c) is proposed.
(A) While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel is controlled to emit light with the gradation value set in advance at the actual measurement timing of the deterioration information. Light emission control unit (b) Deterioration information actual measurement unit (c) Measurement period for obtaining a transition of light emission luminance measured by the luminance detection sensor for each basic light emission color at each measurement timing of deterioration information and obtaining actual measurement deterioration information for each basic light emission color The actual deterioration rate corresponding to the average gradation value is calculated based on the average gradation value and the actual deterioration information, and the actual deterioration rates for all gradation values other than the average gradation value are calculated for each basic emission color. Calculated actual deterioration rate calculation unit

(Mechanism 2)
As a device for correcting input display data output to a display panel, a device equipped with processing functions (a) to (f) shown below is proposed.
(A) While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel is controlled to emit light with the gradation value set in advance at the actual measurement timing of the deterioration information. Light emission control unit (b) A deterioration information actual measurement unit (c) that obtains a transition of light emission luminance measured by a luminance detection sensor for each basic light emission color at each measurement timing of deterioration information, and obtains actual deterioration information for each basic light emission color. A cumulative deterioration information calculation unit that calculates cumulative deterioration information during the actual measurement period for each set of dummy pixels with reference to the gradation value / deterioration rate conversion table, and (d) an estimation error of the cumulative deterioration information with respect to the actual deterioration information Estimated error rate calculation unit for calculating rate (e) Degradation information calculation unit (f) for calculating degradation information for each pixel with reference to the gradation value / degradation rate conversion table Correction amount determination that corrects the difference between the cumulative deterioration information for each pixel and the cumulative deterioration information for each pixel with an estimated error rate, and determines the correction amount corresponding to each pixel for each basic light emission color based on the corrected difference Part

(Mechanism 3)
As an apparatus for updating the gradation value / deterioration rate conversion table that is referred to the calculated character of the deterioration information, a device equipped with the following processing functions (a) to (d) is proposed.
(A) A normal defect determination unit that performs light emission control for the entire gradation range in order for the dummy pixels and determines a normal dummy pixel and a defective dummy pixel based on the actually measured luminance characteristics of each dummy pixel. The dummy pixel light emission control unit (c) controls the light emission of the dummy pixel with the gradation value set in advance at the actual measurement timing of the deterioration information while continuously controlling the light emission of the dummy pixel with the gradation value of the input display data corresponding to ) The actual deterioration information of the dummy pixel is obtained based on the actual measurement result of the luminance detection sensor, and the influence of the actual deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual deterioration information corresponding to only the normal dummy pixel is removed. Degradation information conversion unit for converting to (d) Calculates an estimated error rate for the accumulated measured deterioration information of the calculated deterioration information, and all gradations other than the average gradation value Measured deterioration rate calculation unit that calculates the measured deterioration rate for each value for each basic emission color

(Mechanism 4)
As a device for correcting input display data output to a display panel, a device equipped with the following processing functions (a) to (h) is proposed.
(A) A normal defect determination unit that performs light emission control for the entire gradation range in order for the dummy pixels and determines a normal dummy pixel and a defective dummy pixel based on the actually measured luminance characteristics of each dummy pixel. The dummy pixel light emission control unit (c) controls the light emission of the dummy pixel with the gradation value set in advance at the actual measurement timing of the deterioration information while continuously controlling the light emission of the dummy pixel with the gradation value of the input display data corresponding to ) The actual deterioration information of the dummy pixel is obtained based on the actual measurement result of the luminance detection sensor, and the influence of the actual deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual deterioration information corresponding to only the normal dummy pixel is removed. Deterioration information conversion unit for converting to (d) Refers to the gradation value / deterioration rate conversion table, and calculates cumulative deterioration information during the actual measurement period for each set of dummy pixels for each basic emission color. (E) Deterioration information measurement unit that obtains the transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of deterioration information, and obtains the measured degradation information up to the present for each basic emission color. (F) Estimated error rate calculation unit for calculating an estimated error rate for the measured degradation information of the accumulated degradation information (g) Referring to the gradation value / degradation rate conversion table, the degradation information associated with the display of the input image is calculated for each pixel. (H) The difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel is corrected with the estimated error rate, and the correction amount corresponding to each pixel is based on the corrected difference. Correction amount determination unit for each emission color

According to the invention proposed by the inventors, it is possible to accurately predict the deterioration state of all the light emitters constituting the display panel through the actually measured values of the dummy pixels. That is, the change in the deterioration rate (deterioration speed) due to the display of the input gradation value can be calculated in real time through the actual measurement value of the dummy pixel.
Further, by arranging one luminance detection sensor for a set of dummy pixels, the number of luminance detection sensors can be reduced.

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) Form example 1
(A-1) Functional Configuration of Organic EL Display Device FIG. 1 shows a functional configuration example of an organic EL display device equipped with a gradation / degradation amount conversion table update function.
An organic EL display device 1 shown in FIG. 1 includes a video signal conversion unit 3, a deterioration amount calculation unit 5, a gradation / deterioration amount conversion table 7, a cumulative deterioration amount difference calculation unit 9, a cumulative deterioration amount difference accumulation unit 11, and a correction amount. Determination unit 13, self-luminous panel 15, dummy pixel light emission detection unit 17, detection value averaging unit 19, deterioration characteristic measurement unit 21, dummy pixel cumulative deterioration amount calculation unit 23, average gradation value (APL: average picture level) calculation The unit 25, the estimation accuracy improvement unit 27, and the dummy pixel light emission control unit 29 are configured.

  The video signal converter 3 is a processing device that converts an input display data signal into a corrected display data signal. In the case of this embodiment, the video signal converter 3 executes a process of adding / subtracting a correction value to / from the input display data signal. The correction value is given from the correction amount determination unit 13. Further, the display data signal for the dummy pixel provided from the dummy pixel light emission control unit 23 is multiplexed with the corrected display data signal. The corrected display data signal is given to the deterioration amount calculation unit 5, the self-luminous panel 15, and the APL calculation unit 25.

  The deterioration amount calculation unit 5 is a processing device that calculates the deterioration amount of each pixel associated with image display based on the gradation value corresponding to each pixel. In this embodiment, the gradation / degradation amount conversion table 7 is used. Here, the pixel includes both a pixel in the effective display area and a dummy pixel. Therefore, the deterioration amount calculation unit 5 calculates the estimated deterioration amount for each pixel in the effective display area and the estimated deterioration amount for the dummy pixel.

  FIG. 2 shows an example of the gradation / degradation amount conversion table 7. The gradation / degradation amount conversion table 7 stores all gradation values that can be taken by the input display data signal and the degradation amounts corresponding to these gradation values. The deterioration amount R is given as a 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 cumulative deterioration amount difference calculation unit 9 is a processing device that calculates a cumulative value of a deterioration amount difference newly generated between a certain reference pixel and each pixel in the effective display area. The reference pixel may be a real pixel or a virtually set pixel. The former includes, for example, a pixel having the smallest cumulative deterioration amount in pixel units and a pixel having the largest cumulative deterioration amount in pixel units. The latter includes a virtual pixel that emits light with an average gradation value of one frame.
The estimated deterioration amount corresponding to each pixel in the effective display area is given from the deterioration amount calculation unit 5.

The accumulated deterioration amount difference accumulation unit 11 is a storage area or a storage device that stores the accumulated deterioration amount difference of each pixel with respect to the reference pixel. The cumulative deterioration amount difference represents the degree of progress (whether advanced or delayed) and the degree of progress of a certain pixel with respect to a reference pixel.
The correction amount determination unit 13 is a processing device that determines a correction value corresponding to each pixel based on a cumulative deterioration amount difference. As a method for determining the correction amount, there are a method for determining a correction value so as to eliminate a cumulative deterioration amount difference, and a method for determining a correction value so that visual luminance differences are uniform.
The correction amount determination unit 13 corrects the accumulated deterioration amount difference accumulated in the accumulated deterioration amount difference accumulation unit 11 with the estimated error amount α, and calculates the correction amount for each pixel based on the corrected accumulated deterioration amount difference. decide.

In the case of this embodiment, the estimated error amount α is given as a 100-percentage value by the estimation accuracy improving unit 27. Therefore, the accumulated error amount can be calculated by multiplying the accumulated deterioration amount by the estimated error amount α. The correction principle will be described later.
As described above, the correction amount determination unit 13 determines a correction value based on a value obtained by removing the cumulative error amount from the cumulative deterioration amount.
The self light emitting panel 15 is a display device in which light emitters (self light emitting elements) are arranged in a matrix on a base. In the case of this embodiment, an organic EL element is used as the light emitter.

FIG. 3 shows a plan configuration example of the self-light-emitting panel 15. Note that FIG. 3 is mainly illustrated from the viewpoint of pixel arrangement, and the drive circuit and other peripheral circuits are omitted.
As shown in FIG. 3, the self-luminous panel 15 has a configuration in which a dummy pixel region 153 is disposed outside the effective display region 151. The effective display area 151 is an area that can be observed from the outside, and displays an image corresponding to the input image data signal. On the other hand, the dummy pixel region 153 is a region used for measurement of the deterioration state, and is shielded from light so that the emitted light is not observed from the outside.

In FIG. 3, one pixel on the display in which three pixels of red (R), green (G), and blue (B) are integrated is indicated by one square. As described above, in this embodiment, three colors of red (R), green (G), and blue (B) are set as basic emission colors.
In the case of this embodiment, the dummy pixel region 153 is configured by four dummy pixels 1531 corresponding to one pixel on the display.
FIG. 4 shows an enlarged view of the dummy pixel region 153. As shown in FIG. 4, each dummy pixel 1531 is configured by integrating three pixels of red (R), green (G), and blue (B). In this specification, each pixel (R pixel, G pixel, and B pixel) constituting the dummy pixel 1531 is also referred to as a dummy pixel.

  Each dummy pixel 1531 in the dummy pixel region 153 performs light emission control simultaneously for all pixels or individually in designated pixel units for each emission color of red (R), green (G), and blue (B). FIG. 5 shows an example in which light emission control is performed simultaneously on all dummy pixels for each basic light emission color. FIG. 6 shows an example in which four dummy pixels are divided into two areas, an upper stage and a lower stage, and emission control is performed for each basic emission color. Since light emission can be controlled in units of individual dummy pixels, various deterioration conditions can be tried.

In the case of this embodiment, the dummy pixel 1531 is controlled to emit light using the blanking period of the input display data signal.
In the case of FIG. 3, one data drive line and two gate drive lines are newly arranged for driving the dummy pixel 1531. One of the data drive lines is shared with the pixels of the effective display area 151.
As described above, the dummy pixel 1531 can be realized with the same structure as each pixel in the effective display area 151, and does not require a dedicated or large-scale driving circuit.

  The dummy pixel 1531 has the same structure as the pixel circuit corresponding to each pixel in the effective display area 151. That is, it is composed of a selection transistor and a drive transistor. Therefore, the difficulty in production of the display panel itself and an increase in cost hardly occur.

  The dummy pixel light emission detection unit 17 is a light detection element that detects visible light output from the dummy pixel 1531 and converts it into an electric signal, and is disposed at a position facing the light emission surface of the dummy pixel 1531. An arbitrary detection sensor is applied to the light detection element. The light detection element is preferably a visible light sensor using an amorphous silicon semiconductor. Light quantity information detected as a current value is amplified, converted into a voltage value, and output as a detection signal.

  In the case of this embodiment, one dummy pixel light emission detection unit 17 is arranged for four dummy pixels 1531 (that is, dummy pixel region 153). With this configuration, the number of dummy pixel light emission detection units 17 can be reduced, and a reduction in circuit scale and a reduction in production difficulty can be realized. Incidentally, in the case of arranging for each basic emission color, twelve (3 × 4 pixels) dummy pixel emission detection units 17 are required.

  The detection value averaging unit 19 is a processing device that averages the emission luminance when the dummy pixel groups corresponding to the basic emission color are controlled to be turned on all at once (for example, FIG. 5 and FIG. 6). The detected value averaging unit 19 averages the individual differences among the individual light emitters constituting the plurality of dummy pixels, and enables more accurate deterioration information to be acquired.

  The degradation characteristic actual measurement unit 21 provides the dummy pixel light emission control unit 25 with a timing (measurement timing) for detecting the degradation state of the dummy pixel 1531 and a display data signal (gradation value) applied to the dummy pixel 1531 at the detection timing. It is a processing device. In the case of this embodiment, the detection of the deterioration state is executed at a constant cycle (every fixed number of frames). Further, the detection of the deterioration state is always performed using the same gradation value. By illuminating the dummy pixel 1531 with the same gradation value, it is possible to detect deterioration of the light emitter as a transition of light emission luminance.

Note that the gradation value given to the dummy pixel light emission control unit 29 by the degradation characteristic measurement unit 21 may be set for each RGB, or the same value may be used for any of RGB. For example, a 100% gradation value (“255” when the gradation is 8 bits) is used. Incidentally, the same gradation value is given to the dummy pixels corresponding to the same emission color.
Further, the degradation characteristic actual measurement unit 21 generates a difference ΔR between the light emission luminance detected in the initial state and the light emission luminance detected this time within the actual measurement period (between the initial detection timing of the actual measurement period and the current detection timing). It also functions as a processing device that is given to the estimation accuracy improvement unit 27 as deterioration information.

Note that the degradation characteristic measurement unit 21 also gives the estimation accuracy improvement unit 27 the time required for degradation of the dummy pixel 1531 (in this example, a fixed value) and the average gradation value.
However, when the deterioration characteristic measurement unit 21 calculates the deterioration rate between the actual measurement timings, only the calculation result is given to the estimation accuracy improvement unit 27. The deterioration rate is given as a deterioration amount per unit time. Therefore, ΔR can be obtained by dividing by the number of frames in the actual measurement period.

The dummy pixel cumulative deterioration amount calculation unit 23 is a processing device that calculates a cumulative value of estimated deterioration amounts calculated for dummy pixels for each basic light emission color (for each RGB). The estimated deterioration amount corresponding to each dummy pixel is calculated by the deterioration amount calculation unit 5.
The APL calculation unit 25 calculates the average gradation value for each of the RGB pixels of the corrected display data signal for each frame, and calculates the average value of the average gradation values for each RGB pixel calculated in the past (hereinafter referred to as “average APL value”). And a processing device that executes a process of calculating.

The average gradation value for each RGB pixel calculated for each frame is given to the dummy pixel light emission control unit 29. The average APL value is given to the estimation accuracy improvement unit 27.
The estimation accuracy improving unit 27 has a processing function for improving the accuracy of the gradation / degradation amount conversion table 7 used for calculating the deterioration amount, and a processing function for improving the accuracy of the accumulated deterioration amount difference used for calculating the correction amount. Is a processing device that provides

FIG. 7 shows an internal configuration example of the estimation accuracy improving unit 27. The estimation accuracy improvement unit 27 includes an actually measured deterioration rate calculation unit 271 and an estimation error rate calculation unit 273.
The actually measured deterioration rate calculation unit 271 recalculates the current values of the deterioration rates corresponding to all the gradation values based on the deterioration rate actually measured for each of the RGB values of the dummy pixel 1531 and the average APL value within the actually measured period. A process and a process of calculating a deterioration amount corresponding to each gradation value based on the deterioration rate calculated for all gradation values are executed.

  The estimated error rate calculation unit 273 compares the degradation amount ΔR actually measured for each of the dummy pixels 1531 for each RGB with the cumulative degradation amount calculated by the dummy pixel cumulative degradation amount calculation unit 23, and estimates the error amount with respect to the actual degradation amount ΔR. α is calculated in 100 minutes. The calculated estimated error amount α is given to the correction amount determination unit 13.

  The dummy pixel light emission control unit 29 is a processing device that controls light emission of the dummy pixel 1531. For example, in a period other than the timing of actually measuring the deterioration state of the dummy pixel 1531, the dummy pixel light emission control unit 29 outputs the average gradation value of each frame corresponding to the effective display area for each RGB. This average gradation value is given from the APL calculation unit 25. In addition, at the timing of actually measuring the deterioration state of the dummy pixel 1531, the dummy pixel light emission control unit 29 outputs the fixed gradation value for detecting the deterioration state given from the deterioration characteristic measurement unit 21 for each RGB.

(A-2) Processing Operation Next, the processing operation executed in the organic EL display device 1 will be described.
When the input image is displayed, the input display data signal corresponding to the organic display area 151 is subjected to correction processing by the video signal conversion unit 3 and then given to the light-emitting panel 15 as a corrected display data signal.

  The dummy pixel light emission control unit 29 provides the average gradation value calculated for each frame to the video signal conversion unit 3 as a display data signal for the dummy pixel, unless the detection period of the deterioration state of the dummy pixel 1531 is detected. As a result, the light emission of the dummy pixel 1531 for the R pixel is controlled with the average gradation value of all the R pixels constituting the immediately preceding frame. Further, the light emission of the dummy pixel 1531 for the G pixel is controlled by the average gradation value of all the G pixels constituting the immediately preceding frame. Similarly, the light emission of the dummy pixel 1531 for the B pixel is controlled by the average gradation value of all the B pixels constituting the immediately preceding frame.

FIG. 8 shows an example of a display data signal for the dummy pixel 1531 output from the dummy pixel light emission control unit 29 to the video signal conversion unit 3. As a result, each dummy pixel 1531 emits light in the same state as each RGB pixel in the effective display area 151. That is, if an individual error between pixels is ignored, the deterioration proceeds in the same manner as in the effective display area.
Eventually, when the deterioration state of the dummy pixel 1531 is detected, the dummy pixel light emission control unit 29 uses the inspection gradation value given from the deterioration characteristic actual measurement unit 21 as a display data signal for the dummy pixel, and a video signal conversion unit. Give to 3. FIG. 8 shows a state in which a gradation value of 100% is given to the detection timing.

The degradation characteristic actual measurement unit 21 inputs the average value of the light emission luminance detected by the dummy pixel light emission detection unit 17 through the detection value averaging unit 19 at this detection timing.
FIG. 9 shows a transition example of the detection result. In the figure, the luminance indicated by a black circle is the detected value. As shown by connecting the black circles with a solid line, it can be seen that the detected light emission luminance decreases despite the fact that light is emitted at the same 100% gradation value. However, FIG. 9 exaggerates the decrease in luminance, and it is gradually reduced.

The degradation characteristic actual measurement unit 21 calculates a difference ΔR from the first detection value in the actual measurement period every time the emission luminance of the dummy pixel is newly detected.
FIG. 9 shows how the difference ΔR is obtained between the light emission times t0 and t6.
When the difference ΔR is obtained, the estimation accuracy improving unit 27 can calculate the change rate of the deterioration amount generated within the actual measurement period, that is, the deterioration rate.
FIG. 10 shows the calculation principle of the deterioration rate. FIG. 10 shows a case where the detection luminance at the first detection timing t (n) in the actual measurement period is 100% and the detection luminance at the current detection timing t (m) is 85%.

Therefore, the difference ΔR is 15%. Further, assuming that the number of frames between the detection timings t (n) and t (m) is F, the estimation accuracy improving unit 27 calculates the deterioration rate corresponding to the RGB pixels as ΔR / F, respectively.
Thereafter, the estimation accuracy improvement unit 27 acquires an average APL value for each RGB pixel corresponding to the actual measurement period from the APL calculation unit 25. In the case of FIG. 10, the average gradation value is 100 in terms of gradation value (when the gradation value is 8 bits).

Thus, the relationship between the actually measured deterioration rate within the actual measurement period and the average APL value during the actual measurement period is determined. Since this correspondence is an actual measurement value, it reflects all the contents of the display image, the usage environment, and the like. That is, the correspondence between the average APL value and the deterioration rate (deterioration amount) is accurately reflected.
However, the actually measured correspondence is only one of 256 correspondences (when gradation is given by 8 bits).
Therefore, in order to accurately predict the deterioration rate (deterioration amount) corresponding to all input gradation values, it is necessary to calculate the current deterioration rate (actual deterioration rate) for all other gradation values. .

Therefore, the estimation accuracy improving unit 27 (actually measured deterioration rate calculating unit 271) calculates this correspondence using the basic correspondence between the gradation value and the deterioration rate shown in FIG. The reason for referring to the basic correspondence relationship is that the measured correspondence relationship and other correspondence relationships basically maintain the relationship shown in FIG. 11 even if the actual measurement value of the deterioration rate corresponding to the gradation value changes. Because it is. The basic correspondence relationship shown in FIG. 11 is stored in the measured deterioration rate calculation unit 271 as basic table information.
FIG. 12 shows the principle of calculation of the deterioration rate corresponding to all gradation values by the actually measured deterioration rate calculation unit 271.

12, actually measured relationship is 100 gradation values (when the gradation is expressed by 8 bits) represents the actual deterioration rate at that time as X _100. At this time, the actually measured deterioration rate X _a corresponding to an arbitrary gradation value a is obtained by multiplying the actually measured deterioration rate X ₁₀₀ by the ratio α _a / α ₁₀₀ between the deterioration rates specified through the basic table curve shown in FIG. Can be calculated.
As a result, a new correspondence relationship amplified by the deterioration rate (degradation speed) is calculated while maintaining the basic correspondence relationship between the gradation values.

When the estimated deterioration rate X _a corresponding to all the gradation values is calculated, the estimation accuracy improving unit 27 updates the gradation / deterioration amount conversion table 7 with these values. The deterioration amount is calculated as a product of the actually measured deterioration rate _Xa and the light emission period t. FIG. 14 shows a state in which the deterioration rate is updated for all the gradation values constituting the gradation / degradation amount conversion table 7.
Incidentally, the shorter the detection period (cycle) is, the more generally it can cope with a sudden change in the tendency of the display image. Therefore, the error of the predicted deterioration amount can be reduced accordingly.

In parallel with the update process of the gradation / degradation amount conversion table 7, the estimated error rate calculation unit 273 calculates the estimated error rate α. The estimation error is a deterioration amount difference caused by accumulation of errors generated when the deterioration amount is predicted. Further, the estimated error rate is a 100% error ratio between the estimated deterioration rate and the actual luminance deterioration rate.
FIG. 15 shows the correspondence. In the figure, the thick line corresponds to the change in the actual luminance deterioration rate b, and the thin line corresponds to the change in the estimated luminance deterioration rate a. The estimated luminance deterioration rate is a deterioration amount calculated by the deterioration amount calculation unit 5.

  FIG. 15 represents the luminance deterioration rate as a percentage of 100 with respect to the initial value. In this case, the estimated error rate α is represented by b / a%. Accordingly, if the actual luminance deterioration rate (amount) is ahead of the estimated luminance rate (amount), the estimated error rate α is a value exceeding 100%. On the other hand, if the actual luminance deterioration rate (amount) is later than the estimated luminance rate (amount), the estimated error rate α is less than 100%. If the actual luminance deterioration rate (amount) matches the estimated luminance rate (amount), the estimated error rate α is a value of 100%.

Therefore, the estimated error rate calculation unit 273 calculates the estimated error rate α (= b / a) by dividing the cumulative deterioration amount calculated for the dummy pixel with respect to the actually measured deterioration rate by the actually measured deterioration amount ΔR.
The estimated error rate α is output to the correction amount determination unit 13 and is multiplied by the accumulated deterioration amount difference that is a premise for determining the correction amount.

FIG. 16 illustrates a principle of correcting an error included in the accumulated deterioration amount difference by multiplication of the estimated error rate α. Assume that the estimated error rate α has the same relationship with all the deterioration rates X _{0 to} X ₂₅₅ .
In this case, the actual accumulated deterioration amount difference (rate) β2 is calculated as an estimated error rate α (= b / a) to the estimated and calculated accumulated deterioration amount difference (rate) β1. That is, β2 = (b / a) × β1 is calculated.
As described above, since the correction amount is determined in a state where the influence of the error is removed, the correction accuracy is remarkably improved.

(A-3) Effect As described above, in the organic EL display device according to this embodiment, one or a plurality of dummy pixels 1531 corresponding to the basic emission color are arranged outside the effective display area 151, and each basic emission is performed. The light emission is controlled by the average gradation value of the input display data signal corresponding to the color. Thereby, the deterioration characteristic of the dummy pixel 1531 is matched with the deterioration characteristic in the effective display area. In addition, based on the periodically detected deterioration information of the dummy pixels, the relationship between the gradation value and the deterioration rate (deterioration amount) at the current time point is updated, so that the panel structure is also processed in a signal processing manner. In addition, the prediction accuracy of deterioration information can be improved within a practical range.

At this time, the deterioration rate (deterioration speed) corresponding to all the gradation values can be updated only by actually measuring one correspondence.
For this reason, it is possible to significantly reduce the amount of information to be grasped in advance experiments, and in this respect also, it is possible to realize a significant reduction in manufacturing costs.
Further, in the organic EL display device according to this embodiment, the structure for detecting the light quantity for all the pixels is not required even when the screen size is increased, and the four dummy pixels 1531 to be arranged are also extended from the normal panel process. Can be created on line (with very little change to the panel process).

Further, only one dummy pixel light emission detection unit 17 is arranged for four dummy pixels 1531. For this reason, compared with the case where the dummy pixel light emission detection part 17 is arrange | positioned for every dummy pixel corresponding to each basic light emission color, reduction of a circuit scale and reduction of a production difficulty can be implement | achieved.
In addition, since only one dummy pixel light emission detection unit 17 is required, it is not affected by the number of basic light emission colors constituting the self light emitting panel 15. For this reason, the circuit scale and the difficulty in production can be effectively reduced.

Since there is one dummy pixel light emission detecting unit 17 used for detecting the light emission luminance, the lighting control of the dummy pixels 1531 is sequentially performed for each basic light emission color when the deterioration state is detected. As a result, it is possible to sequentially measure the luminance deterioration amount for each basic emission color.
In addition to improving the accuracy of estimating the amount of newly generated deterioration, it is possible to improve the determination accuracy of the correction amount by removing the error included in the existing cumulative deterioration amount.

(B) Embodiment 2
(B-1) Functional Configuration of Organic EL Display Device As described above, the dummy pixels 1531 corresponding to the basic emission color are arranged outside the effective display area 151, and the estimation accuracy and correction of the deterioration amount based on the actual measurement results By improving the accuracy of determining the value, the burn-in phenomenon can be corrected reliably.

However, a defective phenomenon may occur in the light emission of the dummy pixel. For example, when a phenomenon called “dark spot” occurs where the pixel itself does not emit light, or when a phenomenon called “bright spot” occurs where brightness control does not work at all in a certain light emitting state, “brightness” cannot be controlled to the intended brightness value. A phenomenon called “control failure” may occur.
All of these occur during the panel manufacturing process, and when these phenomena occur in the dummy pixels, naturally, normal luminance detection cannot be performed.

In such a case, the error between the deterioration amount estimation and the actual luminance deterioration cannot be corrected, and conversely, the correction error may increase.
In addition, these phenomena are naturally expected to increase the quality to a level that hardly occurs in mass-produced products.
However, it is difficult to completely eliminate the dark spots even at the mass production level, as is the case with liquid crystal display devices. The dark spot is mainly caused by a small amount of dust in the panel manufacturing process.

Thus, in this embodiment, a mechanism that enables accurate measurement of deterioration information even when a defective pixel is included in the dummy pixel region will be described.
FIG. 17 shows a functional configuration example of an organic EL display device equipped with a gradation / degradation amount conversion table update function. FIG. 17 shows parts corresponding to those in FIG.
18 includes a video signal conversion unit 3, a deterioration amount calculation unit 5, a gradation / deterioration amount conversion table 7, a cumulative deterioration amount difference calculation unit 9, a cumulative deterioration amount difference accumulation unit 11, and a correction amount. Determination unit 13, self-luminous panel 15, dummy pixel light emission detection unit 17, detection value averaging unit 19, deterioration characteristic measurement unit 21, dummy pixel cumulative deterioration amount calculation unit 23, APL calculation unit 25, estimation accuracy improvement unit 27, dummy The pixel light emission control unit 29 and the normal dummy pixel deterioration information conversion unit 31 are configured.

Therefore, a new configuration in this embodiment is a normal dummy pixel deterioration information conversion unit 31. The normal dummy pixel deterioration information conversion unit 31 determines a normal pixel and a defective pixel from the deterioration information of each dummy pixel actually measured by the deterioration characteristic measurement unit 21, and the measurement results of all the pixels according to the determination result of the normal pixels. It is a processing device that provides a processing function for converting to an actual measurement result.
FIG. 18 shows an internal configuration example of the normal dummy pixel deterioration information conversion unit 31. The normal dummy pixel deterioration information conversion unit 31 includes a normal failure determination unit 311 and a deterioration information conversion unit 333.

  The normal / failure determination unit 311 compares changes in luminance characteristics of the respective dummy pixels for each basic light emission color, and determines whether the dummy pixels are normal or defective based on the difference in luminance characteristics. On the other hand, the deterioration information conversion unit 313 executes a process of removing the influence of the actually measured deterioration information of the defective dummy pixel from the actually measured deterioration information of each dummy pixel and converting it to the actually measured deterioration information corresponding to only the normal dummy pixel. Specifically, the actual deterioration information component of the defective dummy pixel is removed from the actual deterioration information detected for a plurality of dummy pixels, and this is divided by the number of normal dummy pixels to convert to actual deterioration information per normal dummy pixel. Or by multiplying these by the total number of pixels, and converting it into the measured deterioration information for the total number of pixels.

(B-2) Processing Operation Next, the processing operation executed in the organic EL display device 101 will be described. As described above, the basic processing operation is the same as in the first embodiment. Therefore, the processing operation of the normal dummy pixel deterioration information conversion unit 27 will be described. In the following description, the four dummy pixels 1531 (consisting of dummy pixels corresponding to RGB) are referred to as dummy pixels 1, 2, 3, and 4 depending on the arrangement position. FIG. 19 shows the positional relationship between the dummy pixels 1 to 4.

FIG. 20 shows an example of a processing operation for determining whether a dummy pixel is normal or defective.
First, the pixel position parameter i is set to 1 (S1). Accordingly, only the dummy pixel 1 is controlled to emit light, and the other dummy pixels 2 to 4 are controlled to be turned off (S2). Note that the light emission of the dummy pixels and the measurement of the luminance characteristics thereof are sequentially executed for each basic light emission color.
Thereafter, the gradation value is changed for all gradation widths (that is, 0 to 100%), and the luminance characteristic at that time is measured and stored (S3).

Thereafter, 1 is added to the pixel position parameter i (S4), and it is determined whether or not the pixel position parameter i after the addition is equal to 5 (S5). Here, if a negative result is obtained, the process proceeds to the light emission control for the next dummy pixel 2. The pixel position parameter i is compared with 5 because the number of dummy pixels is 4. Thereafter, the luminance characteristics of the dummy pixels 2, 3 and 4 are measured in order.
Eventually, when a positive result is obtained in step S5 and the measurement of the luminance characteristics for all the dummy pixels is completed, the measured luminance characteristics are compared (S6). At this time, if there are dummy pixels whose luminance characteristics are clearly different from those of many other dummy pixels, the corresponding dummy pixel is determined as a defective dummy pixel.

In general, the defective dummy pixel is hardly subjected to luminance control, such as “dark spot”. Accordingly, it is considered that the detected luminance characteristic does not substantially change. For this reason, a defective dummy pixel can be identified almost certainly.
When the normal dummy pixel and the defective dummy pixel are specified by the above process, a process of converting the actual measurement value of the deterioration information into the actual measurement value of the normal dummy pixel is executed.

FIG. 21 shows the processing contents executed in the conversion processing. First, all dummy pixels emit light with a predetermined gradation value, and the luminance deterioration rate γ with respect to the initial luminance of the entire dummy pixels is detected (S11). Next, the display gradation of only normal dummy pixels is set to zero, or the display gradation of all dummy pixels is set to zero, and the luminance deterioration rate ζ with respect to the initial luminance for only defective dummy pixels is detected.
Thereafter, the detected two parameters γ and ζ, the number of all dummy pixels and the number of defective dummy pixels are substituted into the following equation, and the luminance deterioration rate corresponding to the four normal dummy pixels is calculated.

Conversion luminance deterioration rate = {γ−ζ × (number of defective dummy pixels / total number of dummy pixels)} × (total number of dummy pixels / normal number of dummy pixels)}
The previous equation is based on the principle that the luminance deterioration rate of the entire dummy pixel is distributed in a form proportional to the light emitting area.
The normal dummy pixel deterioration information conversion unit 31 outputs the luminance deterioration rate thus calculated to the estimation accuracy improvement unit 27. This conversion calculation can increase the reliability of the actually measured deterioration amount.

(B-3) Effect As described above, when the organic EL display device according to this embodiment is used, even when the self-luminous panel 15 includes a defective dummy pixel, the influence of the defective dummy pixel included in the actual measurement result. Can be eliminated. Thereby, the reliability of the actually measured deterioration information obtained from the dummy pixels can be improved, and the prediction accuracy and correction accuracy of the deterioration amount can be increased.

(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, dummy pixels 1531 and the like need only be prepared for the number of basic emission colors.
(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 four dummy pixels (a set of dummy pixels) corresponding to one pixel on the display are arranged on the self-luminous panel has been described. In the case of FIG. 3, the case where one data drive line and two gate drive lines are newly added for driving the dummy pixels has been described. However, the optimum number of data drive lines and gate drive lines may be selected according to the number and arrangement of dummy pixels.

(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, the organic EL display devices 1 and 101 that implement the update function of the gradation / deterioration rate conversion table 7 have been described.
However, the update function of the gradation / deterioration rate conversion table 7 may be implemented as a part of an image processing apparatus equipped with a self-luminous display device. For example, the update function of the gradation / deterioration rate conversion table 7 includes a video camera, a digital camera, and other imaging devices (including not only a camera unit but also a configuration integrated with a recording device), an information processing terminal ( It may be mounted on a portable computer, a cellular phone, a portable game machine, an electronic notebook, etc.), a game machine, a printer device, or the like.

(F) In the above-described embodiment, the organic EL display devices 1 and 101 that implement the update function of the gradation / deterioration rate conversion table 7 have been described.
However, the update function of the gradation / deterioration rate conversion table 7 may be installed in an image processing device that supplies an input display data signal to a self-luminous display device or an image processing device equipped with the self-luminous display device. 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.

(G) In the above-described embodiment, the update function of the gradation / deterioration rate conversion table 7 has been described from the viewpoint of the functional configuration, but it goes without saying that 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.
(H) 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 which shows the function structural example of the self-light-emitting device carrying the update function of a gradation / degradation amount conversion table. It is a figure which shows the structural example of a gradation / degradation amount conversion table. 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 light emission control example of a dummy pixel. It is a figure which shows the light emission control example of a dummy pixel. It is a figure which shows the internal structural example of all the estimation precision floors. It is a figure which shows the example of a display data signal for dummy pixels. It is a figure which shows the example of transition of the degradation characteristic about a dummy pixel. It is a figure explaining the measurement principle of a deterioration rate. It is a figure which shows the example of a basic correspondence relationship referred at the time of calculation of an actual deterioration rate. It is a figure which shows the calculation principle of the actual deterioration rate which referred the basic correspondence. It is a figure explaining the relationship between the deterioration rates on a basic table. It is a figure explaining the update operation | movement of a gradation / degradation amount conversion table. It is a figure explaining an estimated deterioration rate. It is a figure explaining the correction process of the accumulation degradation amount difference by an estimation error rate. It is a figure which shows the function structural example of the self-light-emitting device carrying the update function of a gradation / degradation amount conversion table. It is a figure which shows the internal structural example of a normal dummy pixel deterioration information conversion part. It is a figure which shows the positional relationship of a dummy pixel. It is a figure which shows the example of a normal-failure determination processing procedure. It is a figure which shows the example of a conversion process sequence.

Explanation of symbols

DESCRIPTION OF SYMBOLS 13 Correction amount determination part 153 Dummy pixel area | region 1531 Dummy pixel 17 Dummy pixel light emission detection part 21 Deterioration characteristic measurement part 23 Dummy pixel cumulative deterioration amount calculation part 27 Estimation precision improvement part 271 Measurement deterioration rate calculation part 273 Estimation error rate calculation part 29 Dummy Pixel light emission control unit 31 normal dummy pixel deterioration information conversion unit 311 normal failure determination unit 313 deterioration information conversion unit

Claims (16)

A set of dummy pixels arranged outside the effective display area and corresponding to each of the basic emission colors constituting the effective display area;
A display panel comprising: one luminance detection sensor including all of the set of dummy pixels in a detection region. A plurality of sets of dummy pixels arranged outside the effective display area and corresponding to each of the basic emission colors constituting the effective display area;
A display panel comprising: one luminance detection sensor including all of the plurality of sets of dummy pixels in a detection region. A display in which a set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A panel,
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission for controlling the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information A control unit;
A deterioration information actual measurement unit that obtains a transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of the deterioration information, and obtains actual measurement deterioration information for each basic emission color;
Based on the average gradation value within the actual measurement period and the measured deterioration information, the actual deterioration ratio corresponding to the average gradation value is calculated, and the actual deterioration ratios for all gradation values other than the average gradation value are basically used. A self-luminous display device comprising: an actual deterioration rate calculation unit that calculates for each emission color. The self-luminous display device according to claim 3.
The measured deterioration rate calculation unit
Refer to the basic table that defines the basic correspondence between gradation value and deterioration rate,
Deterioration rate α _p corresponding to the average gradation value _p
And the measured deterioration rate X _p corresponding to the average gradation value _p by multiplying the corresponding ratio α _q / α _p with the deterioration rate α _q corresponding to the gradation value q to be calculated, A self-luminous display device characterized by calculating an actually measured deterioration rate for all gradation values other than a tone value. The self-luminous display device according to claim 3,
A deterioration information calculation unit that calculates deterioration information associated with display of the input image for each pixel based on the correspondence relationship between the gradation value calculated by the actual measurement deterioration rate calculation unit and the actual measurement deterioration rate;
A correction amount determination unit that determines a correction amount corresponding to each pixel for each basic light emission color based on the difference between the cumulative deterioration information about the reference pixel and the cumulative deterioration information of each pixel;
A self-luminous display device, comprising: a video signal conversion unit that corrects an input gradation value based on the calculated correction amount. A display in which a set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A panel,
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission for controlling the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information A control unit;
A deterioration information actual measurement unit that obtains a transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of the deterioration information, and obtains actually measured deterioration information for each basic emission color,
A cumulative deterioration information calculation unit that calculates the cumulative deterioration information for each set of dummy pixels for each basic light emission color with reference to a gradation value / deterioration rate conversion table;
An estimated error rate calculation unit for calculating an estimated error rate for the measured deterioration information of the cumulative deterioration information;
A deterioration information calculation unit that refers to the gradation value / deterioration rate conversion table and calculates deterioration information associated with display of the input image for each pixel;
Correction for correcting the difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel with the estimated error rate, and determining a correction amount corresponding to each pixel for each basic light emission color based on the corrected difference A self-luminous display device comprising: a quantity determining unit. A display in which a plurality of sets of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the plurality of sets of dummy pixels in the detection area are arranged outside the effective display area. A panel,
A normal failure determination unit that sequentially controls light emission for the entire gradation range of the dummy pixels, and determines a normal dummy pixel and a defective dummy pixel based on the measured luminance characteristics of each dummy pixel;
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission control is performed to control the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information. And
Based on the actual measurement result of the brightness detection sensor, the actual deterioration information of the dummy pixel is obtained, and the influence of the actual measurement deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual measurement deterioration information corresponding only to the normal dummy pixel. A deterioration information conversion unit for converting to
An actual measurement deterioration rate calculation unit that calculates an estimation error rate for the accumulated actual deterioration information of the calculated deterioration information and calculates an actual deterioration rate for all gradation values other than the average gradation value for each basic emission color; A self-luminous display device characterized by that. A display in which a set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A panel,
A normal failure determination unit that sequentially controls light emission for the entire gradation range of the dummy pixels, and determines a normal dummy pixel and a defective dummy pixel based on the measured luminance characteristics of each dummy pixel;
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission control is performed to control the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information. And
Based on the actual measurement result of the brightness detection sensor, the actual deterioration information of the dummy pixel is obtained, and the influence of the actual measurement deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual measurement deterioration information corresponding only to the normal dummy pixel. A deterioration information conversion unit for converting to
A cumulative deterioration information calculation unit that calculates the cumulative deterioration information for each set of dummy pixels for each basic light emission color with reference to a gradation value / deterioration rate conversion table;
A deterioration information actual measurement unit that obtains a transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of the deterioration information, and obtains actually measured deterioration information for each basic emission color,
An estimated error rate calculation unit for calculating an estimated error rate for the measured deterioration information of the cumulative deterioration information;
A deterioration information calculation unit that refers to the gradation value / deterioration rate conversion table and calculates deterioration information associated with display of the input image for each pixel;
Correction for correcting the difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel with the estimated error rate, and determining a correction amount corresponding to each pixel for each basic light emission color based on the corrected difference A self-luminous display device comprising: a quantity determining unit. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. In this case, an apparatus for updating a gradation value / deterioration rate conversion table referred to for calculating deterioration information of each pixel,
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission for controlling the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information A control unit;
A deterioration information actual measurement unit that obtains a transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of the deterioration information, and obtains actual measurement deterioration information for each basic emission color;
Based on the average gradation value within the actual measurement period and the measured deterioration information, the actual deterioration ratio corresponding to the average gradation value is calculated, and the actual deterioration ratios for all gradation values other than the average gradation value are basically used. A gradation value / deterioration rate conversion table update device, comprising: an actual deterioration rate calculation unit that calculates for each emission color. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. In this case, an apparatus for updating a gradation value / deterioration rate conversion table referred to for calculating deterioration information of each pixel,
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission for controlling the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information A control unit;
A deterioration information actual measurement unit that obtains a transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of the deterioration information, and obtains actually measured deterioration information for each basic emission color,
A cumulative deterioration information calculation unit that calculates the cumulative deterioration information for each set of dummy pixels for each basic light emission color with reference to a gradation value / deterioration rate conversion table;
An estimated error rate calculation unit for calculating an estimated error rate for the measured deterioration information of the cumulative deterioration information;
A deterioration information calculation unit that refers to the gradation value / deterioration rate conversion table and calculates deterioration information associated with display of the input image for each pixel;
Correction for correcting the difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel with the estimated error rate, and determining a correction amount corresponding to each pixel for each basic light emission color based on the corrected difference A gradation value / deterioration rate conversion table update device, comprising: an amount determination unit; A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A device for correcting input display data output to a display panel,
A normal failure determination unit that sequentially controls light emission for the entire gradation range of the dummy pixels, and determines a normal dummy pixel and a defective dummy pixel based on the measured luminance characteristics of each dummy pixel;
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission control is performed to control the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information. And
Based on the actual measurement result of the brightness detection sensor, the actual deterioration information of the dummy pixel is obtained, and the influence of the actual measurement deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual measurement deterioration information corresponding only to the normal dummy pixel. A deterioration information conversion unit for converting to
An actual measurement deterioration rate calculation unit that calculates an estimation error rate for the accumulated actual deterioration information of the calculated deterioration information and calculates an actual deterioration rate for all gradation values other than the average gradation value for each basic emission color; An input display data correction apparatus characterized by that. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A device for correcting input display data output to a display panel,
A normal failure determination unit that sequentially controls light emission for the entire gradation range of the dummy pixels, and determines a normal dummy pixel and a defective dummy pixel based on the measured luminance characteristics of each dummy pixel;
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission control is performed to control the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information. And
Based on the actual measurement result of the brightness detection sensor, the actual deterioration information of the dummy pixel is obtained, and the influence of the actual measurement deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual measurement deterioration information corresponding only to the normal dummy pixel. A deterioration information conversion unit for converting to
A cumulative deterioration information calculation unit that calculates the cumulative deterioration information for each set of dummy pixels for each basic light emission color with reference to a gradation value / deterioration rate conversion table;
A deterioration information actual measurement unit that obtains a transition of emission luminance measured by the luminance detection sensor for each basic emission color at each measurement timing of the deterioration information, and obtains actually measured deterioration information for each basic emission color,
An estimated error rate calculation unit for calculating an estimated error rate for the measured deterioration information of the cumulative deterioration information;
A deterioration information calculation unit that refers to the gradation value / deterioration rate conversion table and calculates deterioration information associated with display of the input image for each pixel;
Correction for correcting the difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel with the estimated error rate, and determining a correction amount corresponding to each pixel for each basic light emission color based on the corrected difference An input display data correction apparatus comprising: a quantity determination unit. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A computer program for updating a gradation value / deterioration rate conversion table to be referred to for calculating deterioration information of each pixel,
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission for controlling the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information Control processing,
A deterioration information actual measurement process for obtaining a transition of light emission luminance measured by the luminance detection sensor for each basic light emission color at each measurement timing of the deterioration information, and obtaining actual deterioration information for each basic light emission color;
Based on the average gradation value within the actual measurement period and the measured deterioration information, the actual deterioration ratio corresponding to the average gradation value is calculated, and the actual deterioration ratios for all gradation values other than the average gradation value are basically used. A computer program that causes a computer to execute a measured deterioration rate calculation process that calculates for each emission color. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A computer program for updating a gradation value / deterioration rate conversion table to be referred to for calculating deterioration information of each pixel,
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission for controlling the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information Control processing,
Deterioration information actual measurement processing for obtaining a transition of emission luminance measured by the luminance detection sensor for each basic emission color for each measurement timing of the deterioration information, for each basic emission color,
A cumulative deterioration information calculation process for referring to a gradation value / deterioration rate conversion table and calculating cumulative deterioration information for each set of dummy pixels during a measurement period for each basic emission color;
An estimated error rate calculation process for calculating an estimated error rate for the measured deterioration information of the cumulative deterioration information;
A deterioration information calculation process for referring to the gradation value / deterioration rate conversion table and calculating deterioration information associated with display of the input image for each pixel;
Correction for correcting the difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel with the estimated error rate, and determining a correction amount corresponding to each pixel for each basic light emission color based on the corrected difference A computer program that causes a computer to execute a quantity determination process. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A computer program for correcting input display data output to a display panel,
Normal defect determination processing for controlling the emission of the dummy pixels for all gradation ranges in order, and determining normal dummy pixels and defective dummy pixels based on the actually measured luminance characteristics of each dummy pixel;
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission control is performed to control the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information. Processing,
Based on the actual measurement result of the brightness detection sensor, the actual deterioration information of the dummy pixel is obtained, and the influence of the actual measurement deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual measurement deterioration information corresponding only to the normal dummy pixel. Deterioration information conversion processing to convert to,
An estimated error rate with respect to the cumulative measured degradation information of the calculated degradation information, and a measured degradation rate calculation process for computing the measured degradation rate for all gradation values other than the average gradation value for each basic emission color. A computer program to be executed. A set of dummy pixels corresponding to each of the basic emission colors constituting the effective display area and one luminance detection sensor including all of the set of dummy pixels in the detection area are arranged outside the effective display area. A computer program for correcting input display data output to a display panel,
Normal defect determination processing for controlling the emission of the dummy pixels for all gradation ranges in order, and determining normal dummy pixels and defective dummy pixels based on the actually measured luminance characteristics of each dummy pixel;
While the dummy pixel is continuously controlled to emit light with the gradation value of the input display data corresponding to the reference pixel, the dummy pixel emission control is performed to control the emission of the dummy pixel with the preset gradation value at the actual measurement timing of the deterioration information. Processing,
Based on the actual measurement result of the brightness detection sensor, the actual deterioration information of the dummy pixel is obtained, and the influence of the actual measurement deterioration information of the defective dummy pixel included in the actual measurement deterioration information is removed, and the actual measurement deterioration information corresponding only to the normal dummy pixel. Deterioration information conversion processing to convert to,
A cumulative deterioration information calculation process for referring to a gradation value / deterioration rate conversion table and calculating cumulative deterioration information for each set of dummy pixels during a measurement period for each basic emission color;
Deterioration information actual measurement processing for obtaining a transition of emission luminance measured by the luminance detection sensor for each basic emission color for each measurement timing of the deterioration information, for each basic emission color,
An estimated error rate calculation process for calculating an estimated error rate for the measured deterioration information of the cumulative deterioration information;
A deterioration information calculation process for referring to the gradation value / deterioration rate conversion table and calculating deterioration information associated with display of the input image for each pixel;
Correction for correcting the difference between the accumulated deterioration information for the reference pixel and the accumulated deterioration information for each pixel with the estimated error rate, and determining a correction amount corresponding to each pixel for each basic light emission color based on the corrected difference A computer program that causes a computer to execute a quantity determination process.

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