JP6271496B2 - Self-luminous display device burn-in prevention system, method, and computer program - Google Patents

Description

  The present invention relates to a technique for preventing burn-in of a self-luminous display device, and more particularly to a technique for preventing burn-in while preventing a screen displayed by a user from being affected.

  Flat panel display (FPD) light emission methods include non-self-luminous type typified by liquid crystal display (LCD) and self-emission such as plasma display panel (PDP) and organic electroluminescence display (OELD). It can be roughly divided into light-emitting types. In a self-luminous FPD, a light emitting element constituting a pixel deteriorates as the light emission time elapses, so that even if the same energy (pixel value) is supplied, so-called luminance deterioration is caused in which the luminance decreases from the start of use.

  When the luminance degradation of a light emitting element composing a certain pixel deteriorates more than that of the light emitting elements composing the surrounding pixels, when the pixel value for displaying the same color is set for these pixels, A so-called burn-in phenomenon occurs in which the existence can be recognized. For example, when displaying a color display icon as a still image for a long time on a gray desktop screen, the pixels that displayed the icon are displayed when the same gray as the desktop screen is displayed in the area where the icon is displayed. A difference in brightness occurs due to image sticking between the gray and the pixels that originally displayed the desktop screen.

  The image sticking occurs due to a difference in progress of deterioration between the light emitting elements. Since gray drives each light emitting element of red, green, and blue with the same pixel value, three light emitting elements in one pixel deteriorate equally. Therefore, if the entire background image such as a desktop screen is displayed in gray so that the luminance of the light emitting elements is uniform, the image sticking problem hardly occurs. However, in practice, each pixel is driven with a random pixel value in accordance with the image to be displayed, so that a difference occurs in luminance degradation. In particular, when an image that is displayed in a fixed color, such as an icon, is displayed or an image that does not change to an arbitrary position is displayed for a long time, the luminance deterioration becomes severe.

Patent Document 1 discloses an invention in which the luminance deterioration amount of a light emitting element that displays a fixed pattern is equal to the luminance deterioration amount of a light emitting element that displays a background image while preventing a human from feeling a color change. Patent Document 2 discloses a plasma display device that prevents burn-in by saving a screen according to the presence of an operator and the state of a display screen. Patent Document 3 discloses an invention for controlling image sticking by changing the display position of an icon for each luminance in a digital camera including an organic EL display. Non-Patent Document 1, luminance degradation curves of the organic EL element, when (the e of natural logarithm) relative luminance is 1 / e defined time t _e to be doubled, relative luminance L with respect to the initial luminance, L = EXP It describes that can be represented by (-t / _{t e).} Non-Patent Document 2 describes that a luminance deterioration curve of an organic EL element can be fitted with an expanded exponential function.

JP 2011-17746 A Japanese Patent Laid-Open No. 9-50258 Japanese Patent Application No. 2005-37843

Keiichi Furukawa and two others, “All-phosphorescent OLED panel”, [online], 2012, KONICA MINOLTA TECHNOLOGY ROPORT VOL.9, Konica Minolta Technology Center, Inc. [Searched on September 29, 2015], Internet <URL: http://www.konicaminolta.jp/about/research/technology_report/2012/pdf/09_furukawa.pdf> Luminance degradation mechanism in organic EL elements Masahiko Ishii R & D Review of Toyota CRDL Vol.38 No.2

  One pixel of OELD is composed of a plurality of sub-pixels corresponding to red, green, blue (RGB) and red, green, blue, white (RGBW). The sub-pixel starts to deteriorate from OOBE (Out-of-box experience) corresponding to the timing when the user starts to use, and the luminance for the same pixel value (driving current) decreases as the deterioration increases. Since the main factors governing the deterioration amount of the sub-pixel are the pixel value corresponding to the drive current and the light emission time from the OOBE, the deterioration amount of each sub-pixel varies depending on the image to be displayed. Prior art documents devise a display method to suppress burn-in, but there are restrictions on the screen to be displayed. Since the organic EL element does not recover once it has deteriorated, even if a screen saver composed of moving images is displayed, the burn-in that occurs as a difference in luminance deterioration cannot be improved.

  Accordingly, an object of the present invention is to provide a burn-in prevention system for preventing burn-in of a self-luminous pixel matrix. A further object of the present invention is to provide a burn-in prevention system that prevents burn-in without affecting the user screen. A further object of the present invention is to provide a burn-in prevention method and a computer program applied to such a burn-in prevention system.

  The present invention relates to a burn-in prevention system for preventing burn-in of a pixel matrix including a self-luminous light emitting element. The luminance degradation of the light emitting elements of the pixel matrix proceeds independently of each other according to the driving energy and the accumulated light emission time. Luminance deterioration of a self-luminous light emitting element only progresses according to the light emission time and does not recover spontaneously. In the first aspect of the present invention, burn-in prevention is performed by displaying a corrected image and forcibly degrading the luminance of a light emitting element having a high estimated luminance to a low estimated luminance, and uniformizing the overall estimated luminance to prevent burn-in. Provide a system. The burn-in prevention system calculates the current estimated luminance of the light emitting element, and displays a corrected image created in order to equalize the current estimated luminance in the pixel matrix.

  The burn-in prevention system can calculate the estimated luminance of each light emitting element at a predetermined sampling period based on the pixel value corresponding to the driving energy of the light emitting element and the light emission time. As the overall luminance of the pixel matrix increases, the luminance degradation progresses faster, so the longer the sampling cycle, the greater the estimated luminance calculation error. However, the burn-in prevention system uses the sampling cycle according to the luminance set by the user in the pixel matrix. The estimated brightness can be calculated appropriately by changing.

  The corrected image can be composed of an image pattern for degrading each light emitting element from the current estimated brightness to a reference estimated brightness of a predetermined light emitting element that is a target for homogenization. The reference estimated luminance can be the smallest estimated luminance extracted from the entire light emitting elements. If a plurality of cells each including a plurality of light emitting elements are defined in the pixel matrix, the corrected image is obtained by using a representative value of the current estimated luminance of the plurality of light emitting elements constituting the cell as a target for equalization. It can be configured with an image pattern for degrading to a reference estimated brightness that represents the current estimated brightness of a plurality of light emitting elements.

  When the deterioration is corrected on a cell basis, a luminance difference occurs between the cells, and a slight burn-in occurs at the cell boundary. The burn-in prevention system can prevent burn-in at the boundary by changing the display position of the corrected image at predetermined time intervals. The corrected image can be composed of pixel values that equalize the current estimated luminance representative values of the plurality of light emitting elements that constitute each cell over a predetermined display time. In this case, the burn-in prevention system can correct the luminance deterioration by displaying the corrected image for a predetermined display time.

  The corrected image is composed of a plurality of divided corrected images including a plurality of cells having similar hues and a plurality of cells in which the driving of the light emitting elements is stopped, and the burn-in prevention system displays each divided corrected image in a time shorter than a predetermined display time. It can be displayed in time division in order. Since the divided corrected image is composed of a plurality of cells having similar hues, there is no sense of incongruity even if the user has an opportunity to see. In addition, by performing time-division display, it is possible to make the progress of correction according to the elapsed time uniform.

  When deterioration is corrected on a cell-by-cell basis, a luminance difference occurs between the sub-pixels constituting the cell. The burn-in prevention system creates a correction image for equalizing the estimated luminance between the light emitting elements in the cell when the difference between the current estimated luminances of the plurality of light emitting elements constituting the cell exceeds a predetermined value. be able to. The burn-in prevention system can be mounted on computers such as notebook PCs, tablet terminals, and smartphones, and other electronic devices.

  According to a second aspect of the present invention, there is provided a method for preventing burn-in of a pixel matrix including a self-luminous light emitting element that is mounted on an electronic device and constitutes a pixel. Calculates the current estimated brightness of each pixel, selects the standard estimated brightness that is the target of homogenization from the current estimated brightness, and corrects the current estimated brightness to decrease to the standard estimated brightness within a specified display time Display an image.

  In the third aspect of the present invention, a plurality of cells are defined in the pixel matrix, a representative value of the current estimated luminance of the sub-pixel group of the same color that constitutes each cell is calculated, and uniformization is performed from the representative values. A target reference estimated brightness is selected, and a forced deterioration amount corresponding to the difference between the representative value of the current estimated brightness and the reference estimated brightness is calculated. Subsequently, a corrected image for degrading the sub-pixel group by the forced deterioration amount is generated, the use state of the electronic device is monitored, and the corrected image is displayed.

  Estimated brightness is calculated by calculating the difference in the amount of degradation corresponding to the difference between the estimated brightness at the previous sampling time and the estimated brightness when displaying up to the previous sampling time with a predetermined pixel value. By adding the deterioration amount difference to the estimated brightness when it is assumed that the display is performed until the sampling time, the current estimated brightness can be calculated for each arbitrary sampling time.

  The corrected image can be displayed at the timing when the electronic device shifts to the sleep state. Since the user does not see the screen in the sleep state, the corrected image can be created so that the luminance deterioration can be corrected in a short time. At this time, in the portable electronic device, if the corrected image is displayed only when power is supplied from a commercial power source, unintended battery consumption can be prevented. The same pixel value may be set in the sub pixel group for correcting the deterioration of the corrected image, and the light emitting element may be driven for different display times until the correction is completed for each sub pixel group. In this case, since it is not necessary to consider the overall color of the corrected image, the maximum allowable pixel value can be set and correction can be completed in a short time.

  The corrected image can be generated as a plurality of divided corrected images each composed of a predetermined range of hue cells and black cells, and the divided corrected images can be displayed so as to circulate a plurality of times in order for a predetermined time. The corrected image may be displayed when the electronic device is in an idle state. When the luminance of the pixel matrix is increased, the progress of luminance deterioration is accelerated. In order to complete the correction before image sticking occurs, the corrected image can be displayed at a timing set according to the brightness of the pixel matrix adjusted by the user. To calculate the current estimated brightness of the sub-pixels that make up the sub-pixel group, set the reference estimated brightness to equalize the estimated brightness between the sub-pixels in the cell, and make the current estimated brightness the reference estimated brightness By displaying the corrected image, it is possible to prevent burn-in in the cell.

  According to the present invention, it is possible to provide a burn-in prevention system that prevents burn-in of a self-luminous pixel matrix. Furthermore, according to the present invention, it is possible to provide a burn-in prevention system that prevents burn-in without affecting the user screen. Furthermore, according to the present invention, a burn-in prevention method and a computer program applied to such a burn-in prevention system can be provided.

It is a figure which shows a mode that the relative luminance L of the organic EL element light-emitted with the initial luminance V1-V3 falls with progress of light emission time. It is a figure explaining the method of calculating | requiring the estimated value of the present relative brightness | luminance L of the organic EL element which light-emitted, changing a pixel value from OOBE into V1, V2, and V3. Necessary for displaying the relative luminance L _n-1 at the current time t (n−1) as the pixel value V _n from the time t (n−1) and degrading to the relative luminance L _n at the time tn. It is a figure for demonstrating a mode that the forced deterioration amount (DELTA) a is calculated | required. 2 is a functional block diagram for explaining a configuration of a burn-in prevention system 100. FIG. 3 is a flowchart showing an operation procedure of the burn-in prevention system 100. 5 is a flowchart illustrating a method for the burn-in prevention system 100 to generate corrected images 253, 259a to 259h. The average value L _am of the relative luminance of the sub-pixel group 207 is a diagram for explaining a method of calculating for each cell 201. It is a figure for demonstrating the method of calculating the forced degradation amount (DELTA) a for correct | amending luminance degradation for every cell. 6 is a diagram for explaining a configuration of a corrected image 253 in which various pixel values are set for each cell 201 with respect to a sub-pixel group 207. FIG. It is a figure which shows the hue ring 257 for creating the hue pattern 253a from the correction image 253. It is a figure for demonstrating an example which showed the correction image 253 as the hue pattern 253a. It is a figure for demonstrating a mode that the corrected image 259a-259h divided | segmented is displayed.

[Brightness degradation amount]
FIG. 1 is a diagram showing a state in which the relative luminance L of an organic EL element that emits light with an initial luminance V decreases as the light emission time t elapses. The relative luminance L is a value expressed as a ratio to the initial luminance V,
L = EXP (−ωt) (1)
It can be expressed as Here, the light emission time t is the elapsed time from OOBE (time t = 0), and ω is a constant that varies depending on the material and color of the organic EL element. FIG. 1 shows deterioration curves for three different initial luminances V0, V1, and V2 (V0>V1> V2).

The relative luminance of the organic EL element decreases at a deterioration rate corresponding to the square of temperature or current density. In addition, the deterioration rate of the organic EL element varies depending on the color material that emits light, and the luminance deterioration becomes severe in the order of BWGR. The luminance can be associated with a pixel value corresponding to the driving energy of the organic EL element. In the present embodiment, for example, the luminance Lx when a sub-pixel having a color depth of 12 bits is emitted from the OOBE for t hours with an arbitrary pixel value V is:
Lx = (4096− (a × V) ^α ) × EXP (−ωt)
= F (V, t) (2)
It will be expressed as

  Here, a and α are constants, V is a pixel value in the range of 0 to 4095, and ω corresponds to the time until the luminance becomes 1 / e times when light is emitted at the maximum luminance (V = 4095). In one example, α is in the range of 1.2 to 1.8. However, the present invention does not have to be limited to the values exemplified by a, α, ω, and the number of bits of the subpixel.

  Expression (2) indicates that the current luminance Lx can be estimated from the pixel value V and the light emission time t if ω, a, and α are obtained by experiment for each organic EL element of a specific color. Expression (2) indicates that the luminance Lx decreases for the same light emission time t as the pixel value V increases. Or Formula (2) has shown that the light emission time t which falls to the same brightness | luminance Lx becomes short, so that the pixel value V is large.

2, the organic EL element between the time t0~ time t1 is displayed in the pixel values _{V 1,} between times t1~ time t2 is displayed on the pixel values _{V 2,} the time between t2~ time t3 pixel value relative luminance L indicates how the drops when viewed in V _3. The relative luminance L is a relative value with respect to the luminance corresponding to the maximum pixel value (4095) at time t0 in equation (2). Lines 11, 12, and 13 show deterioration characteristics when the same organic EL element emits light at pixel values V ₁ , V ₂ , and V ₃ from time t0, respectively.

In the following description, the elapsed time from time t1 to time t3 based on time t1 to time t3 and time t0 will be described as the same value. Relative luminance L is reduced in accordance with the line 11 at time t0~ time t1, the relative brightness _{L 1} at time t1 becomes _{f (V 1, t 1)} . When the pixel value is changed to V ₂ (V ₂ > V ₁ ) at time t1, the deterioration rate from time t1 to time t2 follows the line 12. Since the pixel value V ₂ is larger than the pixel V _{1, the} deterioration rate becomes larger than that according to the line 11 after the time t ₁ . However, the relative luminance L ₁ at time t1 because not on line 12, it is not possible to calculate the relative brightness L ₂ at the direct time t2 from the line 12.

Here, the relative luminance _{L p1} at time t1, assuming from the time t0 and displayed by the pixel value _{V 2} becomes _{f (V} 2, _{t 1)} in line 12. Relative luminance _{L p2} at time t2 assuming that the displayed pixel value _{V 2} from time t0 to time t2 becomes _{f (V} 2, _{t 2)} in line 12. When relative luminance _{L 1} and the relative luminance difference _{L p1} deterioration amount difference .delta.1 ₌ L 1 _{-L p1,} relative luminance _{L 2} at time t2,
It can be calculated by L ₂ = L _p2 + δ1.

When the pixel value is changed to V ₃ (V ₃ <V ₂ ) at time t2, the deterioration rate from time t2 to time t3 follows the line 13. Since the pixel value V ₃ is smaller than the pixel value V _{2, the} deterioration rate is smaller than that according to the line 12 after the time t ₂ . However, the relative brightness L ₂ at the time t2 because not on line 13, it is not possible to calculate the relative brightness L ₃ directly time t3 from the line 13. Here, the relative luminance _{L p3} at time t2 when it is assumed from time t0 and displayed by the pixel value _{V 3} until time t2 becomes _{f (V} 3, _{t 2)} in line 13.

The relative luminance _{L p4} at time t3, assuming that displayed by the pixel value _{V 3} from the time t0 to the time t3 becomes _{f (V 3, t} 3) in line 13. When the relative luminance _{L 2} and relative luminance difference _{L p3} deterioration amount difference .delta.2 ₌ L 2 _{-L p3} at time t2, the relative brightness _{L 3} at the time t3,
L ₃ = L _p4 + δ2 can be expressed. If the relative luminance L at the previous time and the pixel value V after that are known, the estimated value of the relative luminance at the current time can be calculated by using Equation (2).

FIG. 3 shows an organic EL element having a relative luminance L _n−1 at the current time t (n−1) as a pixel value V _n from the time t (n−1), and a predetermined relative luminance at the time tn. until L _n is a diagram for explaining how to obtain the forced deterioration amount Δa required to degrade. To change the pixel values _{V n} at time t (n-1). When it is assumed that the pixel value V _n is displayed from time t0 to time t (n−1), the virtual relative luminance is L _{p (n−1)} , and the pixel value V _n is displayed from time t0 to time tn. The hypothetical relative luminance when assumed is L _pn .

A deterioration amount difference δ corresponding to the difference between the current relative luminance L _n−1 and the virtual relative luminance L _{p (n−1)} at time t (n−1) is expressed as δ = L _n−1 −L _{p (n -1)} , the relative luminance Ln at time tn is
Ln = L _pn + δ (3)
It can be expressed as Here, the relative luminance L _pn at the time tn can be estimated by f (V _n , t _n ) in the equation (2). Equation (2) shows that when the organic EL element emits light while changing the pixel value V and the light emission time t from OOBE, the current relative luminance L _n−1 is cumulatively calculated, so that at the future time tn. An estimate of the relative luminance Ln is given.

Here, by changing the viewpoint, the pixel value V _n is set from the current time t (n−1) to the future time tn and forcibly deteriorated, and the forced deterioration amount for obtaining the relative luminance L _n at the time tn. If Δa is defined, the forced deterioration amount Δa is
Δa = L _n−1 −Ln = L _{p (n−1)} −L _pn (4)
It becomes. Equation (4) can be transformed into Equation (5).
Δa = f (Vn, t (n−1)) − f (Vn, tn) (5)

In the equation (5), if the forced deterioration amount Δa is a given value, the pixel value V _n and the future time tn become unknown. Since the future time tn can be replaced with the light emission time s from the time t (n−1) to the time tn, the equation (5) can make the pixel value V _n and the light emission time s unknown. Therefore, if any one of the unknowns V _n and s is set to a given value, the remaining unknowns can be solved.

For example, from the equation (5), the pixel value V _n required for degrading only the forced degradation amount Δa can be obtained with the light emission time s from time t (n−1) to time t as a given value. Alternatively, when the pixel value V _n set from the time t (n−1) is set to a given value, the light emission time s required to cause the deterioration by the forced deterioration amount Δa can be obtained. For a given force deterioration amount .DELTA.a, emission time s is as the pixel value V _n is increased short, as the light emission time s is greater pixel value V _n becomes shorter.

  FIG. 4 is a functional block diagram for explaining an example of the configuration of the burn-in prevention system 100. FIG. 4 shows an example in which the burn-in prevention system 100 includes a computer system 101 and a display device 151. The computer system 101 can be an information processing device such as a personal computer, a tablet terminal, and a smartphone, or an electronic device that displays an image on a display device 151 such as a car navigation system or ATM.

  Here, a case where the computer system 101 and the display device 151 are incorporated in a notebook personal computer (notebook PC) will be described as an example. The computer system 101 includes a user function 103, a correction event generation unit 105, an image data output unit 107, a deterioration correction unit 109, and a deterioration amount calculation unit 111. Each element constituting the computer system 101 is configured by cooperation of hardware resources such as a CPU, a system memory, a nonvolatile memory, and an input / output device and software resources such as a device driver, an OS, and an application program. can do.

  A user function 103 performs predetermined processing on data input from an input device such as a keyboard or a network controller, and a desktop screen created by the OS and a window created by an application program in the image data generation unit 107 Instructs numerical values and formula parameters for creating pixel data such as a screen. The image displayed by the user function 103 based on the finger causes burn-in on the display device 151.

  The user function 103 corresponds to, for example, a functional block mounted on a system housing coupled to a display housing on which a display device 151 is mounted in a known notebook PC by a hinge mechanism. The user function 103 monitors the state of the power supply, monitors the open / close state of the display housing, and monitors the idle time. The user function 103 adjusts the luminance of the display device 151 with the luminance adjustment button 103a operated by the user. When the user operates the brightness adjustment button 103a, the brightness of the display device 151 changes as a whole. The deterioration rate of the organic EL element increases as the luminance increases.

  The correction event generation unit 105 monitors the state of the user function 103 and outputs a correction event for creating the correction image 253 (FIG. 9) or the divided correction images 259a to 259h (FIG. 12). The correction event constitutes one element that determines the timing for correcting burn-in. The correction event may be a regular time such as once a week or once a month in one example. In another example, it may be a fixed operation time interval of the notebook PC.

  As the luminance of the display device 151 increases, the progress of image sticking also increases. When the user adjusts the luminance of the display device 151 with the luminance adjustment button 103a, the correction event generation unit 105 can change the timing of issuing the correction event accordingly. The correction event generation unit 105 may generate a correction event based on the current estimated luminance magnitude calculated by the luminance calculation unit 157 of the display device 151 described later. For example, the correction event generation unit 105 may generate a correction event when the estimated luminance difference between the sub-pixels is equal to or greater than a predetermined value.

  When the deterioration amount calculation unit 111 receives a correction event from the correction event generation unit 105, the deterioration amount calculation unit 111 receives the relative luminance Ln at time t (n−1) from the control unit 153 of the display device 151 and creates a correction image 253. Data is generated and sent to the degradation correction unit 109. The degradation correction unit 109 creates the corrected images 253, 259a-259h according to the procedure described with reference to FIGS. The deterioration correction unit 109 monitors the state of the user function 103, generates a display event when detecting the timing of outputting the corrected image, and causes the image data generation unit 107 to store the pixels of the corrected images 253, 259a to 259h. Give instructions to create data.

  The image data generation unit 107 includes a GPU, performs rendering based on an instruction from the user function 103 or the deterioration correction unit 109, and generates pixel data to be displayed on the display device 151. The display device 151 includes a control unit 153 and a pixel matrix 155. The control unit 153 includes a firmware execution circuit, a signal line driving circuit, and a scanning line driving circuit. The control unit 153 receives pixel data (RGB data signal), a synchronization signal, and a clock signal from the image data generation unit 107, and receives a signal line driving circuit. A control signal for driving the scanning line driving circuit is generated, and an RGB data signal is sent to the signal line driving circuit at a predetermined timing. The RGB data signal of the signal line driving circuit is converted into a voltage or current for driving the organic EL element according to the pixel value.

Control unit 153 further includes a luminance calculation unit 157 and a luminance recording unit 159. The luminance calculation unit 157 uses the equation (3) to calculate the relative luminance L _n− at the current sampling time t (n−1) for all subpixels constituting the pixel matrix 155 at a predetermined sampling period. Calculate an estimate of ₁ . Sampling time t (n-1) corresponds to the elapsed time from OOBE, and time t (n-2) or time from the previous sampling time t (n-2) to the current sampling time t (n-1). Assume that light is emitted with a pixel value of t (n−1). The probability that the actual pixel value from time t (n-2) to time t (n-1) matches the pixel value at time t (n-2) or time t (n-1) as the sampling period is shorter. However, since shortening the sampling period increases power consumption, it is desirable to determine the sampling period in consideration of these balances.

The luminance recording unit 159 includes a nonvolatile memory having a storage area corresponding to all the sub-pixels, and the estimated value of the relative luminance L _n−1 at the time t (n−1) calculated by the luminance calculating unit 157, The pixel value at time t (n-2), the pixel value at time t (n-1), and the like are recorded. When requested by the deterioration amount calculation unit 111, the control unit 153 sends an estimated value of the current relative luminance L _n−1 of all the subpixels.

  The pixel matrix 155 includes a plurality of pixels in which organic EL elements are arranged in a matrix. The organic EL element is an example of a self-luminous light emitting element, and the present invention relates to another self-luminous FPD (PDP (plasma display panel), FED (Field Emission Display), or inorganic LED (Inorganic LED)). flat panel display).

  One pixel is composed of three sub-pixels composed of organic EL elements corresponding to RGB. In another example, one pixel can be composed of three sub-pixels composed of three organic elements corresponding to W and a color filter corresponding to RGB. In still another example, one pixel can be composed of three SOLEDs (Transparent Stacked OLED).

  Each pixel includes an organic EL element that functions as a light emitting layer, a switch element (TFT) that controls pixel selection and supply current to the organic EL element, a capacitor that stores RGB data signals, and the like. The organic EL element emits light with a current supplied from the signal line driving circuit. The magnitude of the current changes according to the RGB data signal. The elements of the anti-seize system 100 illustrated in FIG. 4 can be further subdivided and integrated.

  For example, the deterioration correction unit 109, the correction event generation unit 105, and the deterioration amount calculation unit 111 may be integrated. Further, the deterioration correction unit 109 may configure a part that generates a display event for displaying the correction images 253 and 259a to 259h as another element. Furthermore, the luminance calculation unit 157 and the luminance recording unit 159 can be incorporated into the computer system 101, and the deterioration amount calculation unit 111 can be incorporated into the control unit 153.

  FIG. 5 is a flowchart for explaining an operation procedure of the burn-in prevention system 100. FIG. 6 is a flowchart showing how the burn-in prevention system 100 generates the corrected images 253, 259a to 259h. FIG. 7 is a diagram for explaining a method for calculating the average value of the relative luminance of the sub-pixel group 207 for each cell 201.

  FIG. 8 is a diagram for explaining a method of calculating the forced deterioration amount Δa for correcting the luminance deterioration for each cell 201. FIG. 9 is a diagram for explaining the configuration of the corrected image 253 in which various pixel values are set for each cell 201 with respect to the sub-pixel group 207. FIG. 10 is a diagram showing a hue circle 257 for creating a hue pattern 253a from the corrected image 253. FIG. 11 is a diagram for explaining an example in which the corrected image 253 is shown as a hue pattern 253a. FIG. 12 is a diagram for explaining a state in which the divided corrected images 259a to 259h are displayed.

  First, the configuration of the pixel matrix 155 will be described with reference to FIG. In the pixel matrix 155, the deterioration amount calculation unit 111 and the deterioration correction unit 109 each define a plurality of cells 201 as regions of a predetermined size. FIG. 7 illustrates 36 cells 201 with identifiers of cells (0, 0) to (5, 5). An arbitrary cell (x, y) is composed of 12 pixels 203. Furthermore, one pixel 203 includes three subpixels 205 each including subpixels 205r, 205g, and 205b corresponding to RGB. In this embodiment, paying attention to the fact that images of substantially the same color are likely to be displayed in each cell 201, the luminance degradation of the plurality of subpixels 205 included in each cell 201 is caused by subpixels 205r, 205g, It is assumed that every 205b proceeds at almost the same deterioration rate.

  As the area of the cell 201 is reduced, the difference in luminance deterioration between the sub-pixels 205 constituting the cell 201 can be reduced. On the other hand, the burden on the processor is increased, resulting in an increase in power consumption and a decrease in performance. . The size of the cell 201 is preferably determined in consideration of the relationship between the luminance tendency of the sub-pixel 205 and the burn-in in the image (user image) displayed by the user function 103. In the present embodiment, the size of the cell 201 is taken as an example, and the size of the task bar icon is set.

  However, in the present invention, there is no need to particularly limit the cell size. Furthermore, the cells 201 can be of different sizes based on the locality of brightness on the display screen. For example, at a position where a stationary icon is displayed, the size of the cell 201 can be made smaller than the others. Further, the degradation correction unit 109 can dynamically change the size of the cell by detecting the position where the icon stationary for a predetermined time is displayed. In the present invention, the number of sub-pixels 205 constituting each pixel 203 and the arrangement method of the sub-pixels 205 are not particularly limited.

  In block 301 of FIG. 5, the notebook PC on which the burn-in prevention system 100 is mounted starts to operate. The pixel matrix 155 displays an arbitrary image created by the user function 103. The color of the pixel 203 is determined by the ratio of the pixel values of the sub-pixels 205r, 205g, and 205b. Even if the colors are the same, if the user adjusts the brightness adjustment button 103a to increase the brightness of the pixel 203, the progress of the brightness deterioration of each sub-pixel 205 increases. Deterioration of each sub-pixel 205 progresses independently according to equation (2) according to the integrated value of the pixel value and the light emission time.

  In block 303, as described with reference to FIG. 3, the luminance calculation unit 157 calculates an estimated value of the current relative luminance L using Equation (3) at a predetermined sampling period for all the subpixels 205, and calculates the luminance. The recording unit 159 is updated. At this time, the luminance calculation unit 157 assumes that the pixel value of the user image does not change from the previous sampling time t (n−1) to the current sampling time tn, and sets the pixel value Vn to the previous sampling time t (n− The pixel value detected at either the sampling time 1) or the current sampling time tn can be used.

  The user can adjust the overall brightness of the pixel matrix 155 by operating the brightness adjustment button 103a in order to adjust the brightness of the user image according to the usage environment of the notebook PC. As the luminance increases, the deterioration progresses faster. Therefore, if the sampling period is long, the pixel value Vn assumed to be constant from the sampling time t (n−1) to the sampling time tn changes, and the current relative luminance L An error appears in the estimated value. On the other hand, if the sampling period is shortened, the power consumption of the control unit 153 increases. The luminance calculation unit 157 can balance the accuracy of the estimated relative luminance L and the power consumption by adjusting the sampling period according to the overall luminance level of the pixel matrix 155.

  In block 305, the correction event generation unit 105 monitors the state of the user function 103 and outputs a correction event. In block 307, the image sticking prevention system 100 designs the corrected image 253 according to the procedure of FIG. In block 351 of FIG. 6, the deterioration amount calculation unit 111 that has received the correction event acquires the current relative luminance L of all the sub-pixels 205 from the control unit 153. In block 353, the deterioration amount calculation unit 111 defines a sub-pixel group 207 for each RGB color in advance for each cell 201. In FIG. 7, a subpixel consisting of an R subpixel group 207r, a G subpixel group 207g, and a B subpixel group 207b grouped for each of the RGB subpixels 205r, 205g, and 205b is shown in the cell (x, y). A state in which the group 207 is defined is shown.

In the example of FIG. 7, each subpixel group 207 includes 12 subpixels 205. Degradation amount calculation unit 111, the relative luminance L of the sub-pixels 205 that constitute the respective sub-pixel group 207, calculates an average value L _am of the relative luminance of each sub-pixel group 207. FIG. 7 shows a state in which the average values L _rm , L _gm , and L _bm of the relative luminance are calculated for each of the sub-pixel groups 207r, 207g, and 207b constituting the cell (x, y).

The average value L _am of the relative luminance is a representative value of the relative luminance of each sub-pixel group 207, and other representative values such as a median value or a mean square value may be adopted. Block deterioration amount calculating section 111 in 355 extracts the lowest value _{L amin} each RGB from among the mean value L _am of the relative brightness of all the sub-pixel group 207. In FIG. 8, the lowest value L _rmin is extracted from the average values of all the R sub-pixel groups 207r, the lowest value L _gmin is extracted from the average values of all the G sub-pixel groups 207g, and all This shows how the lowest value L _bmin is extracted from the average value of the B sub-pixel group 207b.

FIG. 8 also shows that cell (4,1) contains the lowest value L _rmin , cell (3,2) contains the lowest value L _gmin , and cell (3,4) contains the lowest value L _bmin. Yes. The deterioration amount calculation unit 111 sends the average value L _am of the relative luminance of the sub-pixel group 207 and the minimum value L _amin of the three average values together with their identifiers to the deterioration correction unit 109 for all the cells 201.

The deterioration correction unit 111 in block 357 for the sub-pixel groups 207 of each cell 201, the average value _{L am} of the relative brightness of the current time t using the equation (4) (n-1) , at time tn s time In the _meantime , a compulsory deterioration amount Δa for calculating the lowest average value L _amin is calculated. The forced deterioration amount Δa is calculated as Δr, Δg, Δb for each of the sub-pixel groups 207r, 207g, 207b of each cell 201. Note that the time t (n−1) and the time tn are different from the sampling period when the relative luminance L of the sub-pixel 205 is calculated in the block 351. Time s (FIG. 3) from time t (n-1) to time tn at this time is referred to as a correction time.

  In block 359, the deterioration correction unit 111 uses the equation (5) to set the pixel value V (Vr) to be set for each sub-pixel group 207 in order to deteriorate each cell 201 by the forced deterioration amount Δa during the correction time s. , Vg, Vb). FIG. 8 shows a state in which the pixel value V is set in the cell (x, y). In block 361, the deterioration correction unit 111 creates a corrected image 253 in which the pixel value V calculated in block 359 is set in each sub-pixel group 207 of each cell 201 (FIG. 9).

  In the corrected image 253 shown in FIG. 9, the same pixel value V is set for a plurality of subpixels 205 constituting any one of the subpixel groups 207 in the same cell 201. For example, the pixel value V (150, 200, 250) is set for each color in the sub pixel 205 of the sub pixel group 207 of the cell (0, 0), and the sub pixel of the sub pixel group 207 of the cell (0, 1). Is set to a pixel value V (350, 420, 650) for each color. Between cells, the pixel value V set in the sub-pixel group 207 of the same color may be the same or different depending on the forced deterioration amount Δa.

  When the same pixel value V is set for each of the sub-pixels 205r, 205g, and 205b of the sub-pixel group 207 of the cell (x, y), if the current relative luminance L of the sub-pixel 205 is close to each other, the cell ( x, y) is a single color. When the correction image 253 is viewed as a whole, the random color cells 201 are arranged at random positions. When such a corrected image 253 is displayed, the user feels uncomfortable or uncomfortable. In the present embodiment, in order to obtain a predetermined forced deterioration amount Δa, the corrected image 253 is displayed in a time-sharing manner according to the following procedure so as not to give the user an unpleasant feeling.

  In block 363, the deterioration correction unit 111 patterns the area corresponding to the cell 201 of the corrected image 253 with a hue to create a hue pattern 253a illustrated in FIG. The hue pattern 253a is image data in which the cells 201 of the corrected image 253 are grouped by hue. In one example, the hue pattern 253a can be created using the hue ring 257 illustrated in FIG. The hue ring 257 includes eight hue regions 258 from A to H in which R is 0 degree and the entire circumference is divided into 45 degrees. The number of divisions of the hue region 258 is not particularly limited.

  The deterioration correction unit 111 calculates the angle of the hue by applying the pixel value V (Vr, Vg, Vb) of the sub-pixel group 207 to a well-known formula for each cell 201, and specifies the hue region 258 to which it belongs. The hue pattern 253a is created in order to create a corrected image that does not cause discomfort to the user. When the hue pattern 253a is used, it is possible to sequentially display correction images composed of only the cells 201 and black cells belonging to the same hue region 258. Alternatively, it is possible to sequentially display a corrected image composed of only the cells 201 and black cells belonging to two or more hue regions 258.

  In block 365, the degradation correction unit 111 creates eight divided corrected images 259a to 259h shown in FIG. 12 from the hue pattern 253a. In each of the corrected images 259a to 259h, a predetermined pixel value V is set in each of the sub-pixel groups 207r, 207g, and 207b, and a cell 201 that belongs to one of the hue regions 258 in A to H and a zero pixel value V are set. This corresponds to a corrected image composed of all the remaining cells 201. Since the organic LE element having the pixel value V of zero does not emit light, the cell 201 in that portion becomes black.

  For example, the corrected image 259a includes five cells (0,0), (2,2), (5,2), (4,3), and (0,5) subcells belonging to the hue region 258 of A. A combination of pixel values V (Vr, Vg, Vb) that make the hue region 258 the same is set in the pixel group 207, and pixel values V (0, 0, 0) are set in all the remaining cells 201. . Since each of the corrected images 259a to 259h is composed of cells belonging to the same hue region 208 and black cells, the user does not feel uncomfortable.

  Returning to FIG. 5, in block 309, the deterioration correction unit 109 monitors the user function 103 and generates a display event. The display event gives the timing for displaying the corrected images 253, 259a to 259h. The degradation correction unit 109 generates a display event when the user is not using the notebook PC. In this embodiment, two types of display events are prepared depending on whether or not the user can view the corrected image 253.

  The first type of display event is generated with the display housing of the notebook PC 10 being opened. For example, when the idle time exceeds a predetermined value, the active window does not change for a predetermined time or more, or the user performs an operation of displaying a screen saver with a screen lock to temporarily leave the notebook PC. Generated when etc. In this case, since the user located in front of the notebook PC may look at the screen of the display device 151, it is desirable that the corrected image 253 does not give the user an unpleasant feeling.

  The second type of display event is generated in a state immediately after the user performs an operation of closing the display housing of the notebook PC 10 or in a closed state. In one example, it is generated in response to an event of closing the display housing to automatically transition to the sleep state. Alternatively, it is generated in response to an event that automatically wakes up during the sleep state and performs a predetermined process and then automatically shifts to the sleep state. The degradation correction unit 109 can generate the second type of display event only when the AC / DC adapter is connected to the notebook PC in order to prevent unexpected battery power consumption in the sleep state.

  When the first type of display event is generated, in block 311, the deterioration correction unit 109 instructs the image data generation unit 107 to display the corrected images 259 a to 259 h in order. The corrected images 259a to 259h can be displayed like a conventional screen saver displayed by the user function 101 for the purpose of locking the screen or preventing burn-in, since the user does not feel uncomfortable. When the corrected images 259a to 259h are displayed, only the cells 201 other than black are forcibly deteriorated.

  In order to correct the entire luminance degradation of the pixel matrix 155, it is necessary to display the respective corrected images 259a to 259h for the correction time s necessary for degrading each cell 201 by the forced degradation amount Δa. When the user uses the notebook PC before the predetermined correction time s has elapsed, the display device 151 displays the user image generated by the user function 103. At this time, the burn-in prevention system 100 displays the corrected images 259a to 259h in order from the position where the previous interruption occurred when the first type of display event is generated next, and repeats this operation until the correction time s arrives. be able to.

  If it is assumed that the user function 103 uses the display device 151 before the correction time s arrives, it is desirable that the forced deterioration of each cell 201 by the corrected images 259a to 259h progress evenly. In the present embodiment, the correction images 259a to 259h are displayed in a time-sharing manner in order to forcibly degrade the entire cell almost uniformly. Here, suppose that the number of hue regions 258 set in the hue circle 257 is p, and the time for displaying one correction image at a time is s / q, and p divided correction images are created.

When the correction images are displayed in order of s / pq times, when the divided correction images are displayed pq times, all the correction images are displayed for the correction time s in total, and the ps time is required until the correction is completed. Will spend. Therefore, the correction can be completed in a shorter time as the number of hue regions 258 is reduced. In this embodiment, since p = 8, if q = 10, the correction images 259a to 259h are displayed 80 times and the correction is completed when 8 s hours have elapsed.

  When the second type of display event is generated, the deterioration correction unit 109 instructs the image data generation unit 107 to display the corrected image 253 in block 313. When the second type of display event is generated, the user does not see the screen of the display device 151 because the display housing is closed. Therefore, even if the corrected image 253 in which the cells 201 of various colors are arranged at random is displayed, there is no problem. In addition, since the corrected image 253 is not displayed in a time-sharing manner, the correction of luminance deterioration can be completed in the shortest correction time s.

  If the pixel value V of the sub-pixel group 207 constituting the corrected image 253 is increased, the correction of the luminance deterioration can be completed in a short time. If the maximum pixel value applicable to the correction of deterioration is set for each sub-pixel group 207, the correction time s becomes a different value for each sub-pixel group. The degradation correction unit 109 can also set the maximum pixel value V for each sub-pixel group 207 and set the pixel value V to zero from the sub-pixel group 207 after the correction time s has elapsed. In this case, the color changes in units of cells every time the correction time s of the sub-pixel group 207 elapses, but there is no problem because the user does not see the screen when generating the second type of display event.

  The luminance calculation unit 157 calculates the estimated value of the current relative luminance L of each sub-pixel 205 while displaying the corrected images 253, 259a to 259h. If one display event is generated to display the corrected images 253, 259a-259h, and the other display event is generated after use by the user before the correction time s has elapsed, the burn-in prevention system 100 is in block 307. A new corrected image can be designed. Alternatively, either the corrected image 253 or the divided corrected images 259a to 259h may be displayed according to only the display event of the same type as the display event that occurred first. Alternatively, the burn-in prevention system 100 may use only one of the display events in advance.

  When the luminance degradation is corrected with the corrected images 253, 259a to 259h, there may be a difference in luminance degradation between cells at the cell boundary. In order to eliminate this, the display positions of the corrected images 253, 259a to 259h with respect to the pixel matrix 155 can be displayed while being slightly changed by a predetermined time. When the display positions of the corrected images 253, 259a to 259h change in the vertical and horizontal directions with respect to the original position, the luminance deterioration at the boundary of the cell 201 is averaged between adjacent cells.

  When the correction time s elapses in block 315, the degradation correction unit 109 stops generating the display event, and stops outputting the corrected images 253, 259a to 259h in block 317. In the present invention, it is possible to correct the luminance deterioration without affecting the user screen displayed by the user function 103 regardless of whether the first display event or the second display event is generated.

In the procedure so far, when correction is completed, the average value L _am of the relative luminance of the sub-pixel group 207 converges to the minimum value L _amin of the average value. However, the difference in luminance deterioration between the sub-pixels 205 constituting the sub-pixel group 207 is not eliminated and may be enlarged on the user screen. In block 319, when the deterioration amount calculation unit 111 receives a correction event, for each cell 201, the difference between the maximum value and the minimum value of the estimated luminance L of the sub-pixel 205 constituting each sub-pixel group 207 is a predetermined value. For the sub-pixel group 207 exceeding, the deterioration correction unit 109 can be notified of the sub-pixel group identifier, the sub-pixel group color type, the relative luminance L of each sub-pixel 205 and the sub-pixel identifier.

In block 321, the deterioration correction unit 109 creates and corrects a correction image in which the relative luminance of the sub-pixel 205 of the sub-pixel group 207 becomes the lowest value before correction using the correction images 253 and 259a to 259h. be able to. Then, it is possible to design the corrected image 253,259a~259h after calculating the average value _{L am} sub pixel group 207 again for the sub-pixel groups 207 corrected.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

100 Burn-in prevention system 101 Computer system 151 Display device 155 Pixel matrix 201 Cell 203 Pixel 205, 205r, 205g, 205b Sub-pixel 207, 207r, 207g, 207b Sub-pixel group 253 Corrected image 253a Corrected image hue pattern 257 Hue ring 258 Hue regions 259a to 259h Corrected images divided

Claims (18)

A pixel matrix including a plurality of self-luminous light emitting elements constituting the pixel;
An image data generation unit for generating image data to be displayed on the pixel matrix;
A luminance calculation unit that obtains a pixel value and a light emission time of the light emitting element while changing a sampling period according to the luminance set by the user in the pixel matrix, and calculates a current estimated luminance of the light emitting element;
A burn-in prevention system, comprising: a deterioration correction unit that outputs instruction data for displaying a corrected image for equalizing the current estimated luminance to the image data generation unit. A pixel matrix defining a plurality of cells each including a plurality of self-luminous light-emitting elements constituting the pixel;
An image data generation unit for generating image data to be displayed on the pixel matrix;
A luminance calculation unit for calculating a current estimated luminance of the light emitting element;
A representative value of the current estimated brightness calculated for the plurality of light emitting elements constituting the cell is representative of the current estimated brightness calculated for the plurality of light emitting elements constituting the predetermined cell, which is a target for equalization. The difference between the instruction data for displaying the first corrected image composed of the image pattern that is degraded to the reference estimated brightness and the current estimated brightness of the plurality of light emitting elements constituting the cell has a predetermined value. A burn-in prevention system comprising: a deterioration correction unit that outputs instruction data for displaying a second correction image that equalizes estimated luminance between the light emitting elements in the cell to the image data generation unit when exceeding . The burn-in prevention system according to claim 2, wherein the display position of the first corrected image is changed at a predetermined time interval in order to prevent burn-in occurring at the boundary of the cells. A pixel matrix defining a plurality of cells each including a plurality of self-luminous light-emitting elements constituting the pixel;
An image data generation unit for generating image data to be displayed on the pixel matrix;
A luminance calculation unit for calculating a current estimated luminance of the light emitting element;
A representative value of the current estimated brightness calculated for the plurality of light emitting elements constituting the cell is representative of the current estimated brightness calculated for the plurality of light emitting elements constituting the predetermined cell, which is a target for equalization. A plurality of divided corrected images including a plurality of cells having similar hues and a plurality of cells in which driving of the light emitting elements is stopped , each of which is a corrected image composed of an image pattern that is degraded in a predetermined display time to a reference estimated luminance And a deterioration correction unit that outputs instruction data for displaying each divided corrected image in a time-division manner in order in a time shorter than the predetermined display time to the image data generation unit. An electronic apparatus equipped with the burn-in prevention system according to any one of claims 1 to 4 . A method of preventing burn-in of a pixel matrix including a self-luminous light emitting element that is mounted on an electronic device and constitutes a pixel,
Obtaining a pixel value and a light emission time of the light emitting element while changing a sampling period according to the luminance set by the user in the pixel matrix, and calculating a current estimated luminance of the light emitting element;
Selecting a reference estimated brightness to be a homogenization target from the current estimated brightness;
Displaying a corrected image for reducing the current estimated brightness to the reference estimated brightness. A method for preventing burn-in of a pixel matrix in which a plurality of cells each including a plurality of self-luminous light-emitting elements that constitute pixels are mounted on an electronic device,
Calculating a representative value of the current estimated brightness for the plurality of light emitting elements constituting the cell;
Selecting a reference estimated brightness to be a homogenization target from the representative values;
Displaying a first corrected image composed of an image pattern that degrades a representative value of the current estimated brightness of each cell to the reference estimated brightness;
When a difference between the current estimated luminances of the plurality of light emitting elements constituting the cell exceeds a predetermined value, a second correction image for equalizing the estimated luminance between the light emitting elements in the cell is displayed. And a method comprising the steps of : A method for preventing burn-in of a pixel matrix in which a plurality of cells each including a plurality of self-luminous light-emitting elements that constitute pixels are mounted on an electronic device,
Calculating a representative value of the current estimated brightness for the plurality of light emitting elements constituting the cell;
Selecting a reference estimated brightness to be a homogenization target from the representative values;
Stop the driving of the plurality of cells and the light emitting elements having similar hues in a corrected image composed of an image pattern that degrades the representative value of the current estimated luminance of each cell to the reference estimated luminance in a predetermined display time. Comprising a plurality of division correction images including the plurality of cells,
A step of displaying each division-corrected image in a time-division manner in order of time shorter than the predetermined display time . A method of preventing burn-in of a pixel matrix including a self-luminous light emitting element that is mounted on an electronic device and constitutes a sub-pixel,
Defining a plurality of cells in the pixel matrix;
Calculating a representative value of the current estimated luminance of sub-pixel groups of the same color constituting each cell;
Selecting a reference estimated brightness to be a homogenization target from the representative values;
Calculating a forced deterioration amount corresponding to a difference between the representative value and the reference estimated brightness;
Generating a plurality of divided corrected images each composed of a plurality of cells in a predetermined range of hues and a plurality of black cells for degrading each sub-pixel group by the forced deterioration amount;
And monitoring the usage state of the electronic device and displaying the divided corrected image so as to circulate a plurality of times in order for a predetermined time . A method of preventing burn-in of a pixel matrix including a self-luminous light emitting element that is mounted on an electronic device and constitutes a sub-pixel,
Defining a plurality of cells in the pixel matrix;
Calculating a representative value of the current estimated luminance of sub-pixel groups of the same color constituting each cell;
Selecting a reference estimated brightness to be a homogenization target from the representative values;
Calculating a forced deterioration amount corresponding to a difference between the representative value and the reference estimated brightness;
Generating a corrected image that degrades each sub-pixel group by the forced degradation amount at a timing set according to the brightness of the pixel matrix adjusted by a user ;
Monitoring the usage state of the electronic device and displaying the corrected image. Calculating the representative value comprises:
Calculating a deterioration amount difference corresponding to the difference between the estimated brightness at the previous sampling time and the estimated brightness when it is assumed to display until the previous sampling time with a predetermined pixel value;
The method according to claim 10, further comprising the step of adding the deterioration amount difference to the estimated luminance when it is assumed that the predetermined pixel value is displayed until the current sampling time.   The method according to claim 10, wherein the step of displaying the corrected image is performed at a timing at which the electronic device shifts to a sleep state.   The method of claim 12, wherein the electronic device is a portable electronic device and the step of displaying the corrected image is performed only when the portable electronic device is powered by a commercial power source.   The method according to claim 12, wherein the same pixel value is set in the sub-pixel group that corrects the deterioration of the corrected image, and the light-emitting element is driven for a different display time until the correction is completed for each sub-pixel group. .   The method according to claim 10, wherein the step of displaying the corrected image is performed when the electronic device is in an idle state. In order to prevent burn-in of the pixel matrix including the self-luminous light-emitting elements constituting the pixels,
A function of obtaining a pixel value and a light emission time of the light emitting element while changing a sampling period according to the luminance set by the user in the pixel matrix, and estimating a current luminance of the light emitting element;
A function of selecting a reference estimated brightness to be a homogenization target from the current brightness;
A computer program for realizing the current luminance and a function of displaying a corrected image created from the reference estimated luminance in order to forcibly degrade each pixel to the reference estimated luminance. In order to prevent burn-in of a pixel matrix that defines a plurality of cells each including a plurality of self-luminous light-emitting elements constituting a pixel,
A function of estimating the current luminance of the light emitting element;
A function of calculating a representative value of the estimated current brightness for the plurality of light emitting elements constituting the cell;
A function of selecting a reference estimated luminance to be a homogenization target from the representative values;
And displaying the first corrected image created the estimated current brightness for forcibly degrading the representative value of the estimated current luminance of each cell to the reference estimated luminance and from said reference estimate brightness,
When the difference between the estimated current luminances of the plurality of light emitting elements constituting the cell exceeds a predetermined value, a second correction image for uniformizing the luminance between the light emitting elements in the cell is displayed. A computer program for realizing the functions to be performed. In order to prevent burn-in of a pixel matrix that defines a plurality of cells each including a plurality of self-luminous light-emitting elements constituting a pixel,
A function of estimating the current luminance of the light emitting element;
A function of calculating a representative value of the estimated current brightness for the plurality of light emitting elements constituting the cell;
A function of selecting a reference estimated luminance to be a homogenization target from the representative values;
In order to forcibly degrade the representative value of the estimated current brightness of each cell to the reference estimated brightness in a predetermined display time, the estimated current brightness and the corrected image created from the reference estimated brightness are similar to each other. A function comprising a plurality of division correction images including the plurality of cells having hue and the plurality of cells in which driving of the light emitting element is stopped;
A computer program for realizing a function of time-dividing and displaying each division-corrected image in order of time shorter than the predetermined display time .

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