JP2017111345A - Image display system, display method, and computer program - Google Patents

Image display system, display method, and computer program Download PDF

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JP2017111345A
JP2017111345A JP2015246597A JP2015246597A JP2017111345A JP 2017111345 A JP2017111345 A JP 2017111345A JP 2015246597 A JP2015246597 A JP 2015246597A JP 2015246597 A JP2015246597 A JP 2015246597A JP 2017111345 A JP2017111345 A JP 2017111345A
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image
pixel value
display
gradation correction
original image
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JP6232039B2 (en
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拓水 今井
Takusui Imai
拓水 今井
守幸 土橋
Moriyuki Dobashi
守幸 土橋
のぞみ 石原
Nozomi Ishihara
のぞみ 石原
恭平 杉山
Kyohei Sugiyama
恭平 杉山
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レノボ・シンガポール・プライベート・リミテッド
Lenovo Singapore Pte Ltd
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Abstract

PROBLEM TO BE SOLVED: To reduce power consumption while suppressing sticking of an OELD(organic electroluminescence display).SOLUTION: A host system 101 creates image data of an original image displayed on an OELD 17. A correction event generation part 111 monitors a state of the host system, and outputs a correction event when determining that a user does not use a display. A gradation correction part 103 outputs image data of a correction image in which a pixel value of the original image is decreased by referring to LUTs 105, 107 in accordance with the correction event. The LUT includes gradation correction information in which the input pixel value of the original image is associated with the output pixel value of the correction image. The gradation correction information can be constituted such that the output pixel value becomes equal to or more than the input pixel value in a low pixel area, and that the output pixel value becomes less than the input pixel value in a high pixel area.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for reducing power consumption of a self-luminous display device, and further relates to a technique for preventing burn-in as well as reducing power consumption.

  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. A self-luminous FPD that does not use a backlight expresses a predetermined color by additively mixing the colors of red, green, and blue (RGB) light emitting elements, and all the light emitting elements emit light at the maximum pixel value. As the screen based on white is displayed, the power consumption increases.

  In addition, the light emitting element of the self-light emitting FPD 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 deterioration of a light emitting element constituting a certain pixel progresses more than that of the light emitting elements constituting the surrounding pixels, the difference in luminance between the two by the human eye when a pixel value that displays the same color is set for those pixels. A so-called burn-in phenomenon occurs.

  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. There is a difference in brightness between the gray color and the gray color displayed by the pixels that originally displayed the desktop screen.

  The image sticking occurs due to a difference in progress of luminance deterioration between the light emitting elements. Therefore, if the entire background image such as the desktop is displayed in the same color, the image burn-in problem hardly occurs. However, since an actual light emitting element is driven with a random pixel value according to an image to be displayed, a difference occurs in luminance degradation. In particular, when an image displayed in a fixed bright color in a fixed place 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. Patent Document 4 discloses an OELD that can save power consumption. This document describes that the drive transistor is operated in the saturation region by switching the gamma characteristic in the power saving mode in which the voltage applied to the light emitting element is lower than that in the normal mode.

JP 2011-17746 A Japanese Patent Laid-Open No. 9-50258 Japanese Patent Application No. 2005-37843 Japanese Patent Application No. 2008-83085

  In the past, in order to reduce the power consumption of OELD, images based on black have been adopted for the desktop screen and standby screen. However, when displaying many normal application images with random colors, , Could not get enough effect. Applying processing that can reduce power consumption and suppress burn-in to an application image is not an essential solution because it impairs the original OELD function and places unnecessary stress on the user.

  Therefore, an object of the present invention is to provide an image display system that reduces the power consumption of a self-luminous display. A further object of the present invention is to provide an image display system that suppresses burn-in of a self-luminous display. A further object of the present invention is to provide an image display system that reduces power consumption and suppresses burn-in while not affecting the use of the display by the user. A further object of the present invention is to provide an image display method and a computer program applied to such an image display system.

  The present invention provides an image display system mounted on an electronic device that outputs image data to a self-luminous display. The image display system includes a host system that creates image data of an original image to be displayed on a display, and a correction that outputs a correction event by monitoring the state of the host system and determining acceptable image quality conditions that do not prevent the user from using the display. An event generation unit; a gradation correction unit that outputs image data of a corrected image in which the pixel value of the original image is reduced in response to a correction event; an input pixel value corresponding to the original image; and an output pixel value corresponding to the correction image And the gradation correction information that can be referred to by the gradation correction unit, and the gradation correction information is set so that the output pixel value is less than the input pixel value at least in a high pixel region where the input pixel value is equal to or greater than a predetermined value. It is comprised so that it may become.

  With the above configuration, when the image quality allowance condition is satisfied, it is possible to reduce power consumption and suppress burn-in by displaying a corrected image in which the pixel value of the original image is reduced. Since the image quality allowable condition does not prevent the user from using the display, the user is not stressed. The correction event can be output when the host system determines that it has transitioned to a system idle state in which the processor usage rate is low for a predetermined time.

  The correction event can also be output when the host system determines that it has transitioned to a user idle state in which no user input occurs for a predetermined time. In the system idle state and the user idle state, there is a high possibility that the user is not using the display or does not care about the image quality.

  The correction event can be output when the original image does not change for a predetermined time. An original image that does not change for a predetermined time can be considered to be less useful to the user. The correction event can also be output when it is determined that the user is carrying the electronic device from the output of the acceleration sensor that detects the swing of the electronic device. There is a high possibility that the display is not being browsed while the user is carrying it. The correction event can be output when the video taken by the camera determines that the user has not used the display for a predetermined time. For a user who does not like a reduction in image quality and cares about the battery operating time, the correction event may not be output when the electronic device is operating with an AC power supply, but only when the battery is driven. it can.

  When the gradation correction information includes a plurality of gradation correction information in which different output pixel values are associated with the same input pixel value, the gradation correction unit sets the image quality allowance condition from the plurality of gradation correction information. It is possible to select gradation correction information that makes the pixel value of the corrected image smaller as the duration of establishment is longer. The longer the duration, the higher the possibility that the user is not using the display, and it can be assumed that deterioration in image quality is not a problem. Therefore, it is reasonable to adjust the intensity of gradation correction according to the duration.

  The gradation correction information can be configured so that the output pixel value is equal to or greater than the input pixel value in the low pixel region where the input pixel value is less than a predetermined value. Accordingly, it is possible to reduce power consumption in the high pixel region while reducing the difference in deterioration rate between the light emitting device emitting light in the low pixel region and the light emitting device emitting light in the high pixel region and suppressing burn-in. At this time, the gradation correction information can be constituted by a curve in the low pixel region and a straight line in the high pixel region, or can be constituted in an inverted S shape from the low pixel region to the high pixel region.

  The gradation correction information can be composed of a masking image that corrects the input pixel value for each predetermined region of the original image. The masking image can be configured to correct only the input pixel value in the region where the variation of the original image is a predetermined value or more. Therefore, it is possible to adjust the gradation only for a portion that does not cause a significant decrease in image quality, such as a background image, while preventing the image quality of the portion that displays object images with large variations from being deteriorated. The corrected image can be created when the color space size of the original image is less than a predetermined value. Therefore, the original image whose image quality is important can maintain the image quality even when the correction event occurs.

  According to the present invention, an image display system capable of reducing power consumption of a self-luminous display can be provided. Furthermore, the present invention can provide an image display system that suppresses burn-in of a self-luminous display. Furthermore, according to the present invention, an image display system capable of reducing power consumption and suppressing burn-in while not affecting the use of the display by the user can be provided. Furthermore, according to the present invention, an image display method and a computer program applied to such an image display system can be provided.

It is a functional block diagram which shows the schematic structure of the laptop 10 as an example of a portable electronic device. 1 is a functional block diagram showing a configuration of an image display system 100. FIG. It is a figure for demonstrating an example of LUT105 which stores gradation correction information. It is a figure for demonstrating an example of LUT107 which stores other gradation correction information. It is a flowchart which shows the procedure in which the correction event production | generation part 111 produces | generates a correction event. 3 is a flowchart showing an operation procedure of the image display system 100.

[Hardware configuration of electronic equipment]
The present invention can be applied to an electronic device equipped with a self-luminous display such as a desktop computer, a laptop computer, a tablet terminal, and a smartphone, and an image display system that outputs image data to the self-luminous display. . FIG. 1 is a functional block diagram showing a schematic configuration of a laptop computer (laptop) 10 as an example of an electronic apparatus. When the present invention is applied to the laptop 10 on which the display is mounted, it is particularly effective because the power consumption when the battery is driven can be reduced.

  The CPU 11 includes a memory controller and a PCI Express controller, and a system memory 13, a GPU 15, and a chip set 19 are connected to the CPU 11. An OELD 17 as an example of a self-luminous FPD (Flat Panel Display) is connected to the GPU 15. Connected to the chip set 19 are an HDD 21, a camera 23, an acceleration sensor 25, a microphone 27, and an embedded controller (EC) 29.

  The HDD 21 stores application programs, an OS, a video driver, and the like. The application program includes a memory resident type power management 109 described with reference to FIG. Furthermore, the application program includes well-known software that performs processing for generating a correction event described in FIG. 2 from the outputs of the camera 23, the acceleration sensor 25, and the microphone 27.

  The EC 29 is connected to the DC / DC converter 31, the battery unit 37, the signal line of the charger 35, and the input device 33. The input device 33 includes a keyboard and a pointing device such as a touch panel and a mouse. The EC 29 is a micro controller that controls the power and the temperature inside the housing, and provides an interface for the input device 33. An AC / DC adapter 39 can be connected to the laptop 10 to charge the battery unit 37 and supply power to the system. Although the laptop 10 is composed of a large number of elements, FIG. 1 shows only known elements necessary for the description of the present embodiment, and a detailed description thereof will be omitted.

[Image display system]
FIG. 2 is a functional block diagram showing the configuration of the image display system 100. The image display system 100 is configured by cooperation of the hardware shown in FIG. 1 and software stored in the HDD 21. The image display system 100 includes a host system 101, a gradation correction unit 103, reference tables (LUT) 105 and 107, a correction event generation unit 111, an image evaluation unit 113, and an OELD 17.

  The host system 101 includes the hardware shown in FIG. 1, an application program stored in the HDD 21, an OS, and a device driver. The host system 101 outputs vector format image data created by the OS and application program to the gradation correction unit 103. An image constituted by image data generated by the host system 101 is referred to as an original image. The gradation correction unit 103, the correction event generation unit 111, and the image evaluation unit 113 include a power management 109 provided in the present embodiment as part of an application program. The gradation correction unit 103 includes a GPU 15, a VRAM, and an OS, creates raster format image data from vector format image data, develops the image data in the VRAM, and outputs the raster image data to the OELD 17. In the image data, for example, 8-bit sub-pixels of red, green, and blue (RGB) are each expressed with 256 gradations.

  When the gradation correction unit 103 receives a correction event from the correction event generation unit 111, the gradation correction unit 103 refers to the LUTs 105 and 107 and the image evaluation unit 109 to correct the gradation of the image data. The correction event generation unit 111 monitors the operation state of the host system 101 according to the procedure described in FIG. 5, determines the timing for gradation correction, and outputs a correction event or a cancellation event to the gradation correction unit 103. Since tone correction involves a decrease in image quality, the correction event generation unit 111 generates a correction event when determining that a decrease in image quality is not a problem.

  An original image with a wide color space corresponds to an image that the user wants to express with a precise color, and it may be appropriate not to perform gradation correction on such an original image. The image evaluation unit 113 acquires the size (area) of the color space of the original image in the color space. The image evaluation unit 113 can acquire the size of the color space from the meta information of the image file, the Graphics Subsystem, and the Display Subsystem. Alternatively, the image evaluation unit 113 can calculate the size of the color space from the vertex coordinates of the triangle of the original image. Alternatively, the image evaluation unit 113 can recognize the size from the types of color spaces that have been standardized in advance, such as standardized sRGB and Adobe RGB.

  The OELD 17 includes a controller 17a, a gamma correction circuit 17b, and a pixel matrix 17c. The pixel matrix 17c 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 is applied to other self-luminous FPDs such as a plasma display panel (PDP), a field emission display (FED), or an inorganic LED (Inorganic LED). Can be applied.

  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. 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).

  The controller 17a includes a firmware execution circuit, a signal line driving circuit, and a scanning line driving circuit. 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 corresponding to the image data. The controller 17a receives the image data, the synchronization signal, and the clock signal from the gradation correction unit 103, generates a control signal for driving the signal line driving circuit and the scanning line driving circuit, and sends it to the signal line driving circuit at a predetermined timing. Send RGB data signal.

  The RGB data signal supplied to the signal line driver circuit is converted into a drive current having a magnitude corresponding to the pixel value. The gamma correction circuit 17b corrects the pixel value so that the relationship between the pixel value of the original image and the luminance of the organic EL element approaches a straight line. The gradation correction unit 103, the image evaluation unit 113, and the LUTs 105 and 107 according to the present embodiment can also be configured by the firmware of the controller 17a.

[Tone correction information]
The image data created by the host system 101 forms an original image as a set of pixel values set in the sub-pixels of the pixel matrix 17c. When the pixel value of the original image is input, the gamma correction circuit 17b mounted on the OELD 17 converts the pixel value so that the input pixel value and the luminance are proportional and can be displayed with natural brightness. In addition, the gradation correction unit 103 provides a known screen adjustment service in which the user corrects brightness and color balance according to preference. Such a service is provided by an OS such as Windows (registered trademark). However, the present invention can also be applied to an operating environment of an OS that does not provide a screen adjustment service.

  The tone correction unit 103 according to the present embodiment includes a new tone correction function provided by the power management 109. The gradation correction unit 103 generates a corrected image obtained by converting the pixel value of the original image with reference to the LUT 105 or the LUT 107 so that the sum of the pixel values decreases. The gradation correction unit 103 can return to the screen adjustment service provided by the OS when the gradation correction according to the present embodiment using the LUTs 105 and 107 is not executed. Each of the LUTs 105 and 107 includes a plurality of gradation correction information for converting input pixel values into output pixel values.

  FIG. 3 is a diagram for explaining an example of the LUT 105 that stores gradation correction information. 3A to 3F, the horizontal axis indicates the input pixel value x constituting the original image input to the gradation correction unit 103, and the vertical axis indicates the correction image output by the gradation correction unit 103. The output pixel value y which comprises is shown. The gradation correction information may be held in a function format, but if it is stored in a table format, the burden on the CPU 11 when the gradation correction unit 103 refers can be reduced. A straight line 201 indicates the relationship between the input pixel value x and the output pixel value y when gradation correction is not performed. When tone correction according to the present embodiment is not performed, the pixel value of the original image matches the pixel value of the corrected image, but the pixel value is corrected by applying the OS screen adjustment service.

  A first feature of the gradation correction information stored in the LUTs 105 and 107 is that the total pixel value of the corrected image is made smaller than that of the original image. As a result, the power consumption of the OELD 17 can be reduced, and the overall organic EL element deterioration rate can be reduced to suppress burn-in. The second feature of the gradation correction information is that the difference in luminance of the organic EL elements of the pixel matrix 17c that displays the corrected image, that is, the difference in deterioration rate can be made smaller than that in the original image. As a result, it is possible to suppress burn-in more actively than to decrease the pixel value as a whole. The third feature is that the gradation correction information includes the first feature and the second feature at the same time. However, the gradation correction information may include only one of the first feature and the second feature.

  FIGS. 3A to 3F illustrate different correction profiles 203 to 213, respectively. Each of the correction profiles 203 to 213 includes gradation correction information indicated as a plurality of lines in which different output pixel values are associated with the same input pixel value. As the gradation correction information moves in the direction of the arrow, the intensity of gradation correction increases, and the total pixel value of the corrected image further decreases. In the correction profile 203 shown in FIG. 3A, the gradation correction information is created by shifting to the right while keeping the inclination of the straight line 201 unchanged.

  In the gradation correction information 203a, the output pixel value y is zero in the range where the input pixel value is less than x1 (low pixel region), and the output pixel value y is in the range less than y1 which is less than the maximum value 255. When gradation correction is performed using the gradation correction information 203a, the output pixel value y is subtracted from the straight line 201 by a fixed value over the entire input pixel value x. As the shift amount increases, the subtraction value increases and the power consumption can be further reduced. On the other hand, the image quality in the low pixel region is significantly deteriorated.

  In the correction profile 205 shown in FIG. 3B, the gradation correction information is created so as to reduce the inclination while keeping the position of the origin of the straight line 201 unchanged. The gradation correction information 205a can maintain a certain level of image quality because the output pixel value y does not become zero even in the low pixel region. When the gradation correction information 205a is used for correction, the amount by which the output pixel value y is subtracted from the straight line 201 increases as the input pixel value x increases. In the gradation correction information 205a, since the output pixel value y exists even in the low pixel region, the deterioration of the image quality of the black base image is small as compared with the gradation correction information 203a, and the subtraction value becomes larger as the inclination becomes smaller. Power consumption can be reduced.

  The correction profile 207 shown in FIG. 3C creates tone correction information as a straight line that matches the straight line 201 in the low pixel region, and from the straight line 201 in the range where the input pixel value x is x1 or more (high pixel region). It is also made up of multiple straight lines with small inclinations. In the correction profile 209 shown in FIG. 3D, the gradation correction information is created by a curve having an output pixel value y larger than the straight line 201 in the low pixel region, and a plurality of straight lines having a smaller inclination than the straight line 201 in the high pixel region. Created with.

  The organic EL element that is lit in the low pixel region has a small problem of power consumption, but the deterioration rate is slow, so the difference in deterioration amount from the organic EL element that is lit in the high pixel region, that is, the problem of burn-in becomes large. For example, when there is a white background image around a black object image, the difference in luminance degradation that occurs between black pixels and white pixels increases and burn-in occurs, which reduces power consumption. However, it is advantageous to correct the pixel value in a direction to equalize the deterioration rate.

  When tone correction is performed using the tone correction information 207 and 209, in both low pixel regions that do not contribute much to the reduction in power consumption, the output pixel value y is set to be equal to or greater than the straight line 201 to increase the amount of deterioration in luminance, thereby reducing power consumption. In the high pixel region that greatly contributes to the above, it is possible to suppress the image sticking while reducing the power consumption by making the line less than the straight line 201. The input pixel value x1 that defines the boundary between the low pixel region and the high pixel region can be determined within a range of 5% to 30% of the maximum pixel value, for example.

  The user can set the input pixel value x1 large when emphasizing suppression of burn-in, and can set the input pixel value x1 small when emphasizing reduction of power consumption. When the tone correction information is held as a function, the input pixel value x1 may be dynamically determined from a histogram indicating the distribution of pixel values of the original image. For example, the input pixel value x1 may be set at a predetermined position between the intermediate value or average value calculated from the histogram of the original image and the minimum value. When the input pixel value x1 is determined from the statistic of the pixel value of the original image, it is possible to effectively balance suppression of burn-in and reduction of power consumption for each original image.

  The correction profile 211 shown in FIG. 3E is configured to be an inverted S shape having two inflection points. The gradation correction information 211a is larger than the line 201 in the low pixel region and smaller than the line 201 in the high pixel region. The correction profile 211 gives the same effect as the correction profile 209 in the low pixel region, but can further reduce the output pixel value y in the high pixel region, and thus is effective in reducing power consumption when applied to a white tone original image. Is. A correction profile 213 shown in FIG. 3F corresponds to gradation correction information called so-called gamma correction. The gradation correction information 213a having the feature of gamma correction is also within the application range of the present invention.

  The correction profiles 203 to 213 shown in FIG. 3 are examples for explaining the present invention, and all the gradation correction information that can be easily recalled by those skilled in the art based on well-known techniques are included in the scope of the present invention. The user can apply correction profiles 203 to 213 to a predetermined original image in advance and register a desired correction profile in the gradation correction unit 103.

  The gradation correction unit 103 can select a correction profile and gradation correction information based on the distribution of pixel values of the original image. For example, it is possible to select the correction profile 211 for a white-tone original image and effectively reduce power consumption. At this time, it is possible to select gradation correction information for performing stronger gradation correction as the sum of the pixel values of the original image is larger. Further, in the original image with black base tone, by selecting the correction profile 209, it is possible to suppress burn-in while suppressing deterioration in image quality in the low pixel region.

  FIG. 4 is a diagram for explaining an example of the LUT 107 that stores other gradation correction information. FIG. 4A shows a specific original image 300 displayed by the OELD 17. In the original image 300, the background image 301 is white, and the object images 301a to 301c display characters, figures, patterns, and the like. The original image 300 has a large power consumption because the background image 301 with a large area is white, and when it is displayed for a long time, image sticking occurs between the original image 300 and the organic EL elements that display the object images 300a to 300c.

  The gradation correction unit 103 divides the screen into a plurality of cells 351 as shown in FIG. 4B, and determines whether each cell 351 includes object images 301a to 301c. In an example of the determination method, for each cell 351, the standard deviation or variance is calculated from the statistic of the input pixel value x, and the variation is evaluated. It is presumed that a cell whose variation is larger than a predetermined value displays some object image, and a cell whose variation is smaller than a predetermined value is estimated to display the background image 301 or an image having low usefulness.

  4A and 4B, the cell 351 displaying the background image 301 has a small variation, and the cell 351 displaying the object images 301a to 301c has a large variation. The gradation correction unit 103 performs gradation correction without performing gradation correction or weak gradation correction on a cell having a large variation, and determines a correction amount for a cell having a small variation according to the average value of the pixel values of the cell. A masking image 371 (FIG. 4C) for correction is generated.

  The masking image 371 corresponds to gradation correction information that gives the same correction amount for each cell 351. The masking image 371 sets the correction amount to zero for the cell group 351a displaying the object images 301a to 301c. For the cell group 351b displaying the background image 301, a subtraction value or an addition value can be set as a correction amount according to the average value of the pixel values of each cell. When displaying a black tone image with an average pixel value smaller than a predetermined value in a cell with small variations, an addition value is set, and a white tone image with an average pixel value larger than the predetermined value is displayed. When subtracted value can be set.

  The subtraction value can be set so as to increase as the average value increases. The correction amount set for each cell is applied as the same addition value or subtraction value to the input pixel values of all the sub-pixels constituting the cell. As a result, the image quality can be maintained in the regions of the object images 301a to 301c. In addition, the pixel value of the correction image is reduced for the white background image 301 to reduce power consumption, and the pixel value of the correction image is increased for the black background image 301 to suppress burn-in. Can be planned.

  The gradation correction unit 103 can create a masking image 371 in advance for a predetermined original image with high occurrence frequency and store it in the LUT 107. The gradation correction unit 103 can select the masking image 371 to be applied when there is a correction event by storing the gradation correction information 371 in the LUT 107 in association with the identifier of the original image. The gradation correction unit 103 can also create a masking image 371 to be applied to the original image displayed at that time by calculating variation each time a correction event is received from the correction event generation unit 111. .

[Correction event]
Next, a procedure in which the correction event generation unit 111 generates the correction event and the release event will be described based on the flowchart of FIG. The correction event generation unit 111 that monitors the state of the host system 101 does not give stress to the user even if the tone correction is performed, or the possibility of applying the stress is small, so the burn-in suppression and power consumption It is generated when it is determined that it is more advantageous to reduce the value.

  In block 401, the host system 101 operates and the image display system 100 is constructed. In block 403, the correction event generation unit 111 measures the duration of system idle. System idle can be defined as a state where the usage rate of the CPU 11 provided by the OS is less than a predetermined value. In another example, the system idle can be defined as a state where the CPU 11 is in the sleep state Cx at a predetermined depth. When the system idle state continues for a predetermined time or more, the process proceeds to block 413, and when the system idle state cannot be determined, the process proceeds to block 405.

  In block 405, the correction event generation unit 111 measures the duration of the user / idle. User idle can be defined as a state in which the OS does not detect an input event corresponding to a user input from the input device 33 or the microphone 27. When the user / idle state continues for a predetermined time or more, the process proceeds to block 413, and when the user / idle state cannot be determined, the process proceeds to block 407.

  In block 407, the correction event generation unit 111 observes a change in image data output from the host system 101 to the gradation correction unit 103. When the image data does not change for a predetermined time or more, that is, when the same image is continuously displayed on the OELD 17, the process proceeds to block 413, and when it cannot be determined that the image has not changed, the process proceeds to block 409. In block 409, the correction event generation unit 111 receives the output of the acceleration sensor 25 from the host system 101.

  Since the user is troublesome to resume from the sleep state, the user may continue to display the screen without closing the display housing of the laptop 10 when moving from the office to the conference room. Alternatively, the laptop 10 that can be used in the tablet mode is often carried with the screen displayed. The correction event generation unit 111 determines from the output of the acceleration sensor 25 whether the user is walking while holding the laptop 10. It can be assumed that the image displayed by the OELD 17 when walking is not viewed by the user or has a low expectation for image quality even when viewed.

  If it is determined from the vibration magnitude and frequency pattern that the user is walking for a predetermined time, the process proceeds to block 413, and if it is not determined that the user is walking, the process proceeds to block 411. In block 411, the correction event generation unit 111 acquires information regarding the presence of the user's face or the position of the line of sight based on the video detected by the camera 23 from the host system 101. The correction event generation unit 111 proceeds to block 413 when it is determined that there is no face of the user heading to the OELD 17 for a predetermined time, or when the face is present but the line of sight is facing away from the screen. If not, return to block 403.

  There are cases where the user wants to perform gradation correction only when the battery is driven. In block 413, the correction event generation unit 111 determines the connection state of the AC / DC adapter 39. When the AC / DC adapter 39 is connected, the process returns to block 403, and when the battery is driven, the process proceeds to block 415. The determinations in blocks 403 to 411 correspond to image quality permissible conditions that allow a negative state for the user that the image quality deteriorates in order to reduce power consumption and suppress burn-in. The image quality allowance condition may not be satisfied after it is satisfied once. For example, in block 403, the state where the CPU usage rate increases beyond the value defined as system idle may continue for a predetermined time.

  Alternatively, the image data may change after it is determined in block 407 that the image data does not change. When the correction event generation unit 111 determines in block 415 that the image quality permission condition has been canceled, the correction event generation unit 111 proceeds to block 419 and outputs a cancellation event. Conditions such as the elapsed time for canceling the image quality allowance condition once established can be determined according to the characteristics of each image quality allowance condition. In block 417, the correction event generation unit 111 outputs a correction event including the identifier and the duration corresponding to the cause blocks 403 to 411.

  The correction event generation unit 111 can output the additional correction event by detecting the duration with a predetermined interval when the specific image quality allowance condition continues. For example, when the system idle state continues at block 403, a correction event can be generated for stronger tone correction at every predetermined duration. It is not necessary to adopt all the determinations of the image quality allowance conditions shown as blocks 403 to 411, and the order need not be limited to those exemplified. Furthermore, the correction event generation unit 111 may output a correction event only when a plurality of image quality permission conditions selected from the blocks 403 to 411 are satisfied at the same time.

[Operation of image display system]
FIG. 6 is a flowchart showing an operation procedure of the image display system 100. In block 501, the power management 109 is registered as an idle task in the OS task scheduler. In another example, the power management 109 can be registered with the task scheduler to be executed at a predetermined cycle. The gradation correction unit 103 performs gradation correction using a screen adjustment service provided by the OS.

  When the idle condition of the task scheduler is established at block 503, the power management 109 is executed, and the image display system 100 is constructed on the laptop 10. The image evaluation unit 113 acquires a color space every time the original image changes. When the correction event generation unit 111 outputs a correction event in block 505, the process proceeds to block 507. In block 507, the gradation correction unit 103 recognizes the type of correction event. The type of correction event includes an identifier indicating the duration. In block 509, the gradation correction unit 103 acquires the size of the color space of the original image from the image evaluation unit 113, and determines that it is better not to perform gradation adjustment when it is larger than the predetermined value, and returns to block 505.

  In block 511, the gradation correction unit 103 selects appropriate gradation correction information from the LUTs 105 and 107 based on the type of correction event and the identifier of the original image. For example, when the identifier of the original image matches the identifier of the gradation correction information 371 registered in the LUT 107, the gradation correction unit 103 acquires the corresponding masking image 371 from the LUT 107.

  If there is no masking image 371 corresponding to the original image, any of the correction profiles 203 to 213 registered in the LUT 105 can be selected. As the correction profiles 203 to 213, those set by default by the user can be adopted. Alternatively, the correction profiles 203 to 213 can be selected based on the statistics of the original image.

  The gradation correction unit 103 acquires gradation correction information having an intensity corresponding to the type of correction event among the selected correction profiles 203 to 213. For example, the gradation correction unit 103 selects any one of the correction profiles 207 to 211, and the output pixel value y in the high pixel region becomes smaller with respect to the same input pixel value x as the duration of the image quality allowable condition is longer. Is obtained.

  In block 513, the gradation correction unit 103 outputs a corrected image created by performing gradation correction on the original image with the acquired gradation correction information to the OELD 17. When the idle state ends in block 515, the gradation correction unit 103 returns the OS screen adjustment service to end the image display system 100 in block 517, and then returns to block 503. When the correction event generation unit 111 outputs a release event in block 519, the gradation correction unit 103 ends the gradation correction in block 521, returns the OS screen adjustment service, and then returns to block 505.

  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.

17 Organic EL display (OELD)
100 Image display system 105, 107 Look-up table (LUT)
109 Power management 203 to 213 Correction profile 203a to 213a Gradation correction information 300 Original image 301 Background image 301a to 301c Object image 351 Cell 371 Masking image (gradation correction information)

Claims (16)

  1. An image display system mounted on an electronic device that outputs image data to a self-luminous display,
    A host system for creating image data of an original image to be displayed on the display;
    A correction event generation unit that monitors the status of the host system, determines an image quality allowable condition that does not prevent a user from using the display, and outputs a correction event;
    A gradation correction unit that outputs image data of a corrected image obtained by reducing the pixel value of the original image in accordance with the correction event;
    Gradation correction information that can be referred to by the gradation correction unit that associates an input pixel value corresponding to the original image and an output pixel value corresponding to the corrected image;
    An image display system in which the gradation correction information is configured so that the output pixel value is less than the input pixel value at least in a high pixel region where the input pixel value is a predetermined value or more.
  2.   The image display system according to claim 1, wherein the correction event generation unit determines that the image quality allowance condition is satisfied when the host system transitions to a system idle state in which a processor usage rate is low for a predetermined time.
  3.   The image display system according to claim 1, wherein the correction event generation unit determines that the image quality permission condition is satisfied when the host system is transitioning to a user idle state in which no user input is generated for a predetermined time.
  4.   The image display system according to claim 1, wherein the correction event generation unit determines that the image quality permission condition is satisfied when the original image does not change for a predetermined time.
  5.   The correction event generation unit determines that the image quality allowance condition is satisfied when an output of an acceleration sensor that detects a swing of the electronic device indicates that the user is carrying the electronic device. Image display system.
  6.   The image display system according to claim 1, wherein the correction event generation unit determines that the image quality permission condition is satisfied when an image captured by a camera indicates that a user has not used the display for a predetermined time.
  7.   The gradation correction information includes a plurality of gradation correction information in which different output pixel values are associated with the same input pixel value, and the gradation correction unit includes the gradation correction information from the plurality of gradation correction information. 2. The image display system according to claim 1, wherein gradation correction information is selected so that the pixel value of the corrected image becomes smaller as the time when the image quality allowable condition is satisfied becomes longer.
  8.   The image display system according to claim 1, wherein the gradation correction information is configured such that the output pixel value is equal to or greater than the input pixel value in a low pixel region where the input pixel value is less than a predetermined value.
  9.   The image display system according to claim 1, wherein the gradation correction information includes a masking image that corrects the input pixel value for each predetermined region of the original image.
  10.   The image display system according to claim 9, wherein the masking image is configured to correct only an input pixel value in a region where variation of the original image is a predetermined value or more.
  11.   An electronic device equipped with the image display system according to claim 1.
  12. An electronic device equipped with a self-luminous display is a method for displaying an image,
    Creating an original image to be displayed on the display;
    Estimating a state in which the user is not using the display;
    Creating image data of a corrected image created so that the pixel value of the original image is at least less than the pixel value of the original image in a region where the pixel value of the original image is greater than or equal to a predetermined value based on the estimation;
    Outputting the image data of the corrected image to the display.
  13.   The method according to claim 12, wherein the creating step includes a step of making a pixel value of the corrected image larger than a pixel value of the original image when a pixel value of the original image is less than a predetermined value.
  14. The creating step comprises:
    Dividing the original image into a plurality of cells;
    Calculating a distribution of pixel values for each cell;
    The method according to claim 12, further comprising: selecting a cell that lowers the pixel value of the original image based on the distribution of the pixel value and a cell that maintains the pixel value of the original image.
  15.   The method according to claim 12, further comprising calculating a size of a color space of the original image, and executing the output step when the size of the color space is less than a predetermined value.
  16. In electronic devices equipped with a self-luminous display,
    A function of creating an original image to be displayed on the display;
    A function for estimating a state in which the user is not using the display;
    A computer program for realizing a function of creating image data of a corrected image in which a difference between pixel values of the original image is reduced and a total of pixel values is reduced based on the estimation.
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