JP7480370B1 - Electronic device, display device, control method, and program - Google Patents

Abstract

[Problem] To suppress the manifestation of pixel degradation. [Solution] Equipped with a controller and memory, the memory stores candidate image data showing a plurality of candidate images with different luminance distributions, and the controller calculates the accumulated load for each pixel by accumulating the load for driving the pixel over time, and when a predetermined active event is not continuously detected for a predetermined time or more, selects a candidate image that improves the uniformity of the accumulated load as a background image with priority, and displays the background image on a display panel. [Selected Figure] Figure 1

Description

This application relates to electronic devices, display devices, control methods and programs, for example, displaying background images.

A display panel is made up of multiple pixels arranged on a substrate, and displays an image based on the distribution of brightness for each pixel. Individual pixels deteriorate with use, resulting in a decrease in brightness at a certain driving power. This phenomenon is prominent in OLED (Organic Light Emitting Diode) displays. For example, the display device described in Patent Document 1 has an array of sub-pixels that emit light of multiple colors, and aims to extend the lifespan by reducing the current passing through each pixel.

Differences in the usage history between pixels can be a factor in the difference in the degree of deterioration. In a color display, the lighting time and the brightness history when lit may differ between pixels of multiple colors. As an example, assume that a green silhouette is displayed on a display based on the RGB color system. In this case, in the display area of the silhouette, pixels that emit green light (hereinafter sometimes referred to as "green pixels") are lit, and pixels that emit red light (hereinafter sometimes referred to as "red pixels") or pixels that emit blue light (hereinafter sometimes referred to as "blue pixels") are turned off. Deterioration of green pixels progresses faster than red or blue pixels when driven. The color tone may change because the green light component from the deteriorated green pixels becomes relatively smaller.

Depending on the user's usage habits and preferences, images with high brightness in certain areas may be frequently displayed. The deterioration that occurs in these areas is more severe than in other areas, so the brightness in these areas tends to be lower than in other areas. This type of unevenness in brightness and color is called burn-in, and can be unintentionally seen as a pattern. Burn-in tends to be evident in OLED displays.

JP 2022-21644 A

One possible solution is to attenuate the drive power for the other pixels so that their brightness is equivalent to that of the pixel with the greatest degree of degradation under a common signal value (or drive current). Attenuating the drive power reduces the brightness of the pixel to which it is supplied. The other pixels would still have the ability to emit light at a higher brightness by supplying more drive power to them, but they would not be able to demonstrate this ability. Also, a mechanism is needed to adjust the drive power according to the degree of degradation for each pixel in order to correct the brightness and color.

The present disclosure has been made to solve the above problems, and an electronic device according to a first aspect includes a controller and a memory, the memory stores candidate image data showing a plurality of candidate images with different luminance distributions, the controller calculates an accumulated load for each pixel by accumulating the load on the drive of the pixel over time, and when a predetermined active event is not continuously detected for a predetermined time or longer, selects a candidate image that improves the uniformity of the accumulated load as a background image with a higher priority, and causes the background image to be displayed on a display panel.

The controller may select as the background image a candidate image with lower brightness in an area with a larger cumulative load.

The controller may calculate a correlation coefficient between the cumulative load and brightness for each region of each candidate image, and may give priority to a candidate image having a smaller correlation coefficient when selecting the background image.

The above controller may stop displaying the background image when it detects an activity event while displaying the background image.

The display device according to the second aspect includes the electronic device and a display panel described above.

The program according to the third aspect is a program for causing a computer to function as the electronic device described above.

The control method according to the fourth aspect is a control method for an electronic device that stores candidate image data showing a plurality of candidate images with different luminance distributions, and the electronic device executes the steps of: calculating a cumulative load for each pixel by accumulating the load on the drive of the pixel over time; selecting, when a predetermined active event is not continuously detected for a predetermined time or longer, a candidate image that improves the uniformity of the cumulative load as a background image with a higher priority; and displaying the background image on a display panel.

This embodiment makes it possible to prevent pixel degradation from becoming apparent.

FIG. 13 is a diagram illustrating an example of cumulative load distribution. FIG. 13 is a diagram showing an example of selection of a background image. FIG. 2 is a schematic block diagram illustrating an example of a hardware configuration of the electronic device according to the embodiment. FIG. 2 is a schematic block diagram illustrating an example of a functional configuration of the electronic device according to the present embodiment. 10 is a flowchart illustrating an example of a background image display process according to the present embodiment.

Hereinafter, an embodiment of the present application will be described with reference to the drawings. In the following description, an example will be taken of an electronic device 1 according to the present embodiment, which is mainly a notebook personal computer (a so-called notebook PC (Personal Computer)). The electronic device 1 includes a controller and a memory. Candidate image data is stored in advance in the memory of the electronic device 1. The candidate image data indicates multiple frames of candidate images. The candidate images have different luminance distributions for each frame. The luminance distribution is expressed by a signal value for each pixel, and is originally information that represents a pattern. The pattern is any one of a pattern, a character, a symbol, and a figure, or a combination of any of these. The luminance distribution is expressed by a luminance value for each pixel. The candidate images are images that are candidates for the background image.

A background image may be used as the background of the desktop environment of a user interface (UI) of a computer system. A background image may also be called wallpaper, standby screen, desktop picture, or standby screen. The controller of the electronic device 1 displays the background image on the display when no active event is detected continuously for a certain period of time or more. Active events include, for example, the start or update of a screen display by an application program (sometimes referred to as an "app" in this application), a user operation (user action) for instructing a change in the screen display, and the output of sound. When the controller detects any active event, it stops displaying the background image.

The controller of the electronic device 1 calculates an accumulated load for each of the multiple pixels on the display panel 14 by accumulating the load caused by driving the pixel over time. When the controller does not detect a specific active event continuously for a specific period of time or more, it selects as a background image, from among the background images of multiple frames, a candidate image that improves the uniformity of the accumulated load between pixels with priority. In general, the higher the brightness of a pixel that emits light, the greater the load on that pixel. In selecting a candidate image, the controller gives priority to a candidate image with a higher brightness for a portion having a pixel with a large accumulated load. The controller causes the display panel 14 to display the selected candidate image as a background image.

1 shows an example of the distribution of the accumulated load. In the example of FIG. 1, the distribution of the accumulated load is displayed as a heat map Im02 on the display panel 14 of the electronic device 1. In the illustrated heat map Im02, the darker the area, the lower the accumulated load. The upper right circular part shows a lower accumulated load than its surroundings, and the lower right elliptical part shows a higher accumulated load than its surroundings. The controller of the electronic device 1 preferentially selects a candidate image having a characteristic that makes the increase in the accumulated load more gradual in the area with a larger accumulated load. Specifically, the upper right elliptical part shown in FIG. 1 or the candidate image Im04 shown in FIG. 2 is selected as the background image as an image with low brightness in the surrounding area. The selected candidate image Im04 shows the sun in the upper right as a pattern with high brightness and clouds in the lower right as a pattern with low brightness. Since the spatial bias of the accumulated load is mitigated among the multiple pixels constituting the display panel 14, the degree of deterioration of the pixels is uniformed, and the deterioration can be suppressed from becoming apparent.

Next, a hardware configuration example of the electronic device 1 according to the present embodiment will be described below. Fig. 3 is a schematic block diagram showing a hardware configuration example of the electronic device 1 according to the present embodiment.
The electronic device 1 is composed of a CPU 11, a main memory 12, a video subsystem 13, a display panel 14, a chipset 21, a BIOS (Basic Input Output System) memory 22, an auxiliary storage device 23, a USB (Universal Serial Bus) connector 24, an audio system 25, a network card 26, an RTC (Real Time Clock) 27, an embedded controller 30, a power supply circuit 31, a battery 33, and an input device 34.

The CPU 11 is a central processing unit that controls the functions of each part of the electronic device 1. The CPU 11 executes processing instructed by commands written in a program deployed in the main memory 12, thereby realizing the functions. Note that in this application, executing processing instructed by commands written in a program may be referred to as "executing a program" or "running a program."

The main memory 12 has a read area for various programs executed by the CPU 11. The main memory 12 has a work area for storing various data acquired by the CPU 11 and various data used in the processes executed by the CPU 11. The programs executed by the CPU 11 include, for example, an OS (Operating System), various drivers for operating peripheral devices, various services/utilities, and application programs (sometimes referred to as "apps" in this application). The CPU 11 and the main memory 12 constitute a system device that constitutes the main computer system of the electronic device 1. In other words, the CPU 11 corresponds to a controller for controlling the entire electronic device 1.

The video subsystem 13 performs drawing processing under the control of the CPU 11 to generate various display data, which it outputs to the display panel 14. The video subsystem 13 includes, for example, a video controller and a video memory. The video controller generates drawing information according to drawing commands input from the CPU 11, and writes the generated drawing information to the video memory. The video controller reads the drawing information from the video memory, and outputs display data indicating the read drawing information to the display panel 14.

The display panel 14 displays the display screen as drawing information instructed by the display data input from the video subsystem. The display panel 14 is, for example, an organic light emitting diode (OLED) display panel. The OLED display panel has a substrate and a plurality of pixels, which are arranged two-dimensionally at regular intervals. Each pixel has an organic light emitting diode as a light emitting element. In general, the more the driving current to the organic light emitting diode is, the higher the brightness of the light it emits. The organic light emitting diode deteriorates over time. Furthermore, the longer the use time is, the more the deterioration is accelerated. Under a constant driving voltage, the higher the driving current or brightness, the more the deterioration is accelerated. Due to the deterioration, a decrease in brightness occurs under a constant driving current. This difference in the usage situation for each pixel can cause unintended spatial changes in brightness, which can cause the user to feel uncomfortable.

Various devices are connected to the chipset 21, which controls the operation or input/output of each device. The chipset 21 has controllers for various data buses. For example, the chipset 21 has a Universal Serial Bus (USB), a serial AT Attachment (Serial ATA), a Serial Peripheral Interface (SPI) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express bus, and a Low Pin Connect (LPC) bus. In the example of FIG. 3, the chipset 21 is connected to a Basic Input Output System (BIOS) memory 22, an auxiliary storage device 23, a USB connector 24, an audio system 25, a network card 26, a Real-time Clock (RTC) 27, and an Embedded Controller (EC) 30.

The BIOS memory 22 stores the BIOS, system firmware used to control devices such as the embedded controller 30, etc. The BIOS memory 22 includes an electrically rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or a flash ROM.
The auxiliary storage device 23 permanently stores various data in a readable and writable manner. The auxiliary storage device 23 stores programs such as an OS, various drivers, various services/utilities, and applications. The auxiliary storage device 23 may be, for example, a solid state drive (SSD) or a hard disk drive (HDD).

The audio system 25 performs recording, encoding, decoding, input/output, etc. of various types of audio data.
The network card 26 is connected to a network wirelessly or via a wire to perform data communication. The network card 26 is connected to other devices directly or via another network, for example, via a wireless LAN (Local Area Network).
The RTC 27 measures the date and time at that time. The RTC 27 consumes power supplied from a backup battery (not shown). The backup battery is provided separately from the battery 33. Therefore, the RTC 27 can constantly measure the date and time even if the supply of power from the power supply circuit 31 is stopped due to a shutdown of the electronic device 1.

The embedded controller 30 has a power management function that controls the power circuit 31. As the power management function, the embedded controller 30 controls the power circuit 31 based on the operating state notified from the system device, and controls the power supplied to each device. The power supply destinations include system devices such as the CPU 11. The embedded controller 30 also outputs various input data input from the input device 34 to the system device via the chipset 21. The input data may include operation data corresponding to user operations. The embedded controller 30 is a microcomputer having a CPU and main memory that are separate from the CPU 11 and main memory 12. The embedded controller 30 is capable of steady operation regardless of the operating state of the CPU 11 and main memory 12.

The power supply circuit 31 controls the supply of power to each device according to the control of the embedded controller 30. The power supply circuit 31 includes, for example, a DC (Direct Current)/DC converter, a charge/discharge unit, and the like. The DC/DC converter converts the voltage of the direct current power supplied from the charge/discharge unit to a voltage required by each device, and supplies the converted voltage to the device. The charge/discharge unit controls charging of the battery 33 with the power supplied from an AC (Alternative Current)/DC adapter (not shown) or discharging of the battery 33 from the battery 33. The charge/discharge unit supplies a part or all of the power supplied from the AC/DC adapter to the DC/DC converter. The charge/discharge unit charges the battery 33 with the surplus power that is not consumed among the power supplied from the AC/DC adapter. The charge/discharge unit supplies the power discharged from the battery 33 to the DC/DC converter when power is not supplied from the AC/DC adapter or when the power from the AC/DC adapter is insufficient. The AC/DC adapter converts AC power supplied from an external commercial power source into DC power, and supplies the converted DC power to the charge/discharge unit.

The battery 33 has a storage battery that can be charged with power supplied from the power supply circuit 31 or that discharges the charged power under the control of the power supply circuit 31 .
The input device 34 includes a device that receives a user's operation and acquires operation data in response to the received operation. The input device 34 includes, for example, any one of a keyboard, a touch pad, a mouse, etc., or any combination thereof. The touch sensor constituting the input device 34 may be integrated with the display panel 14 so as to overlap with it, and configured as a touch panel.

Next, an example of the functional configuration of the electronic device 1 according to this embodiment will be described. FIG. 4 is a schematic block diagram showing an example of the functional configuration of the electronic device 1 according to this embodiment. The electronic device 1 includes a host system 100, a display panel 14, an input device 34, and a storage unit 200. The host system 100 is the main computer system of the electronic device 1, and the CPU 11 executes processing instructed by commands written in a specific program, and cooperates with the main memory 12, the display panel 14, the input device 34, the auxiliary storage device 23, the embedded controller 30, and other hardware to perform its functions. The specific program can be, for example, an app or utility software.

The host system 100 includes a load calculation unit 102 , a display processing unit 104 , and a program processing unit 106 .
The load calculation unit 102 calculates an accumulated load for each pixel arranged on the display panel 14 by accumulating the load for driving the pixel over time. Here, the load means the degree of influence of deterioration due to driving. In general, the more driving current supplied to a pixel, the greater the load. The load is roughly proportional to the 1.3 to 1.5 power of the luminance. In other words, deterioration over time progresses at a speed proportional to the 1.3 to 1.5 power of the luminance. The period for accumulating the load starts from the time when the display panel 14 begins to be used and ends at the present time.

When determining the load for each pixel, the load calculation unit 102 acquires display data indicating a signal value for each pixel from the video subsystem 13, for example. Each signal value indicates luminance. The load calculation unit 102 may set load relationship information indicating the relationship between the load corresponding to the luminance realized for each signal value. The load relationship information may be expressed as a function that gives a load for a signal value or its parameters, or may be expressed as a data table indicating the relationship between the signal value and the load. The load calculation unit 102 can refer to the load relationship information, identify the load for each pixel based on the image data, and calculate the cumulative load by integrating the identified load over the usage time of the display panel 14. The degree of deterioration that accumulates over time is quantified by using the cumulative load. The load calculation unit 102 updates the cumulative luminance information indicating the cumulative luminance calculated for each pixel at a constant period, and stores the updated cumulative luminance information in the storage unit 200. The cumulative luminance may be converted into a luminance that can be realized for a reference signal value, or a signal value corresponding to that luminance. The distribution of the cumulative luminance for each pixel may be represented as a heat map. The heat map expresses the accumulated luminance or converted signal value for each pixel with a color. In general, the more severe the degradation, the greater the accumulated luminance and the smaller the converted signal value tends to be. When calculating the accumulated luminance, the load calculation unit 102 uses a load corresponding to the signal value for each pixel that represents the display screen, regardless of the type of program, if the program instructs the display panel 14 to display a screen.

The display processing unit 104 monitors whether an active event has been detected in the electronic device 1. An active event is, for example, an event that serves as a clue to active use, such as the start or update of a display screen associated with the launch of an app, the input of an operation signal that directly or indirectly instructs a change in the screen display, or the output of a sound. The display processing unit 104, for example, calls a specific built-in function that is part of the functionality of the OS, and obtains a return value that indicates the detection of an active event.

When an active event is not detected continuously for a predetermined time (e.g., 30 seconds to 3 minutes) or more, the display processing unit 104 causes the display panel 14 to display one of the candidate images as a background image, and when an active event is next detected, the display processing unit 104 stops displaying the background image and causes the display panel 14 to display a display screen according to the program currently being executed. In this application, the display screens displayed according to the program currently being executed may be collectively referred to as "normal screens." Normal screens may include display screens displayed according to apps and other programs, as well as setting screens used to set various parameters, message screens for conveying various messages, a home screen displayed immediately after the electronic device 1 is started, and an initial screen displayed immediately after the app begins execution.

When an active event is not detected continuously for a predetermined time or longer, the display processing unit 104 reads out candidate image data from the storage unit 200. The candidate image data is display data showing a plurality of background images. Among the plurality of background images, the display processing unit 104 preferentially selects as a background image a candidate image that improves the uniformity of the accumulated load between pixels when displayed. More specifically, for each predetermined region, the greater the accumulated load for each pixel included in that region, the more the display processing unit 104 preferentially selects a background image having pixels that indicate a signal value that gives a lower luminance.

The display processing unit 104, for example, calculates the correlation coefficient between the cumulative load and the signal value for each region, and selects a background image having a luminance distribution that gives the smallest correlation coefficient, where the calculated correlation coefficient is significantly less than 0. A negative correlation coefficient indicates that there is an inverse correlation between the cumulative load and the signal value (or luminance) for each pixel. The region on which the correlation coefficient is based forms a part of the display screen or background image. The number of pixels in each region may be one or more. When there are more than one pixel, the display processing unit 104 uses a representative value of the cumulative load and a representative value of the signal value for each region, instead of the cumulative load and signal value for each pixel. The representative value may be any of a simple average value, a weighted average value, a mode value, etc., that represents the value for each pixel in the region.

The display processing unit 104 outputs display data showing the selected background image as a display image to the display panel 14. The selected background image is displayed on the display panel 14. When the display processing unit 104 detects any active event while displaying the background image, it stops displaying the background image and resumes displaying the display screen. However, if the active event is a display start or update, the display processing unit 104 causes the display panel 14 to display the display screen related to the display start or update.

The program processing unit 106 executes processing instructed by commands written in various programs. Program execution management may be executed as part of the OS functions. Programs that are the subject of execution management may mainly be apps. Programs may include commands to display various display screens. Display screens are not limited to still images, and may include moving images. The start or end of processing may be instructed by operation data input from the input device 34. When the display screen is displayed, each pixel arranged on the display panel 14 is driven by receiving drive power. The driven pixels are subjected to a load by consuming drive power to emit light.

The storage unit 200 temporarily or permanently stores various data used in the processing of the host system 100 and various data acquired by the host system 100. The storage unit 200 stores cumulative load information and candidate image data. The storage unit 200 includes various storage media such as RAM (Random Access Memory) and ROM (Read Only Memory). The main memory 12 and the auxiliary storage device 23 are used as the storage media.

Next, a background image display process according to the present embodiment will be described with reference to a flowchart shown in FIG 5.
(Step S102) The program processing unit 106, in accordance with the program being executed, causes the display panel 14 to display a normal screen. Here, the program processing unit 106 outputs to the display panel 14 display data showing the normal screen as a display screen.
(Step S104) The display processing unit 104 sets a timer and starts counting the elapsed time from that point on.

(Step S106) The display processing unit 104 monitors the occurrence of an active event. When an active event is detected (step S106: YES), the process returns to step S104. This resets the timer, and the measurement of the elapsed time is restarted. When an active event is not detected (step S106: NO), the process proceeds to step S108.
(Step S108) The display processing unit 104 judges whether the elapsed time being counted is equal to or greater than a predetermined time. If the elapsed time is equal to or greater than the predetermined time (YES in step S108), the process proceeds to step S110. If the elapsed time has not yet reached the predetermined time (NO in step S108), the process returns to step S106.

(Step S110) The display processing unit 104 reads out from the storage unit 200 cumulative load information indicating the cumulative load for each pixel at that time point and candidate image data indicating candidate images for a plurality of frames.
(Step S112) The display processing unit 104 selects, as a background image, a candidate image indicating a signal value that most improves the uniformity of the accumulated load when displayed.
(Step S114) The display processing unit 104 causes the display panel 14 to display the selected background image.
(Step S116) The display processing unit 104 monitors the occurrence of an active event. When an active event is detected (step S116: YES), the process returns to step S102. This causes the display of the normal screen to resume. When an active event is not detected (step S116: NO), the process of step S116 is repeated. This causes the display of the background image to be maintained.

In the process of FIG. 5, the display processing unit 104 selects a new background image each time it is determined that an active event has not been detected continuously for a predetermined time or more, but this is not limited to the above. The time when a new background image is selected and the time when the background image is displayed do not necessarily need to be synchronized. The display processing unit 104 may select a new background image based on the cumulative load information every certain period (e.g., 1 to 60 days). Until a new background image is selected, the same background image is displayed on the display panel 14 every time it is determined that an active event has not been detected continuously for a predetermined time or more. The display processing unit 104 may select a new background image based on the cumulative load information every time the host system 100 of the electronic device 1 is started or restarted, or every certain period (e.g., 1 to 60 days).

In the above description, the electronic device 1 is provided with a display panel 14 and is configured integrally with other components, but this is not limiting. The display panel 14 may be detachable from the electronic device 1, or may be separate from the electronic device 1. The number of display panels 14 to which display data is output is not limited to one, and may be multiple. In this case, the load calculation unit 102 may generate cumulative load information for each display panel 14. The display processing unit 104 may select a background image for each display panel 14 based on the cumulative load information, and display the selected background image.

In the above description, the host system 100 is mainly provided with the load calculation unit 102 and the display processing unit 104, but this is not a limitation. Instead of the host system 100, a controller (e.g., a timing controller) provided in the embedded controller 30 or the display panel 14 may have the functions of the load calculation unit 102 and the display processing unit 104. These controllers also execute a predetermined program and have the functions of a computer system. With the embedded controller 30 or the display panel 14, background image display processing can be realized regardless of the operating state of the host system 100.

Furthermore, the electronic device 1 is not limited to a notebook PC, but may be a general-purpose information processing device such as a desktop PC, a mobile phone, or a tablet terminal device, or may be a dedicated electronic device used for screen display, such as an electronic advertising device (digital signage).
The electronic device 1 may include a display panel 14 and may be configured as a series of display devices.

The programs for realizing the functions of the load calculation unit 102 and the display processing unit 104 may be configured separately from the program processing unit 106 or other programs. The programs for realizing the functions of the load calculation unit 102 and the display processing unit 104 may take any form, such as an application program, an API (Application Program Interface) function, a utility, or firmware. These programs are stored in a non-transitory storage medium in advance, and are read and executed by the CPU 11 or other controller to realize their functions.

As described above, the electronic device 1 according to the present embodiment includes a controller (e.g., the host system 100) and a memory (e.g., the storage unit 200). The memory stores candidate image data indicating a plurality of candidate images with different luminance distributions. The controller calculates an accumulated load for each pixel by accumulating the load for driving the pixel over time, and when a predetermined active event is not continuously detected for a predetermined time or more, selects a candidate image that improves the uniformity of the accumulated load as a background image with a higher priority, and displays the selected background image on the display panel 14. The controller may also stop displaying the background image when an active event is detected while the background image is being displayed.
With this configuration, when an active event is not detected continuously for a predetermined time or more, a background image is displayed on the display panel 14 with a higher priority given to candidate images that improve the uniformity of the cumulative load. By limiting the time when a background image is displayed when an active event is not detected for a predetermined time or more, it is possible to spatially uniformize the deterioration of the display panel 14 without interfering with the user experience (UX). By preventing the deterioration from concentrating in a specific area, the deterioration of the display panel 14 is suppressed from becoming apparent.

Furthermore, the controller may select, as the background image, a candidate image with lower brightness in an area with a larger accumulated load, with higher priority.
With this configuration, the cumulative load and the brightness of the candidate images are evaluated for each region to select a background image, so that the ability to improve the uniformity of the cumulative load for each candidate image can be evaluated by simple calculation.

Furthermore, the controller may calculate a correlation coefficient between the accumulated load and the luminance for each region of each candidate image, and select as the background image a candidate image having a smaller correlation coefficient with higher priority.
With this configuration, a candidate image with a small correlation coefficient with the cumulative load is preferentially selected as the background image, and the ability to improve the uniformity of the cumulative load for each candidate image with a different luminance distribution can be systematically formulated.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to the above-mentioned embodiments, and include designs within the scope of the gist of the present invention. The configurations described in the above-mentioned embodiments can be combined in any manner.

1...electronic device, 11...CPU, 12...main memory, 13...video subsystem, 14...display panel, 21...chipset, 22...BIOS memory, 23...auxiliary storage device, 24...USB connector, 25...audio system, 26...network card, 27...RTC, 30...embedded controller, 31...power supply circuit, 33...battery, 34...input device, 100...host system, 102...load calculation unit, 104...display processing unit, 106...program processing unit, 200...storage unit

Claims (6)

It has a controller and memory,
the memory stores candidate image data representing a plurality of candidate images having different luminance distributions;
The controller:
Calculating an accumulated load for each pixel by accumulating the load for driving the pixel over time;
When a specified active event is not detected continuously for a specified period of time or more,
Selecting a candidate image as a background image with a higher priority in terms of improving the uniformity of the accumulated load;
displaying the background image on a display panel;
Calculating a correlation coefficient between the cumulative load and brightness for each region of the candidate image;
A candidate image having a smaller correlation coefficient is preferentially selected as the background image.
Electronics. The controller:
The electronic device according to claim 1 , wherein a candidate image having a lower luminance in an area having a larger accumulated load is selected as the background image with higher priority. The controller:
When the active event is detected during display of the background image,
The electronic device according to claim 1 , wherein the display of the background image is stopped. The electronic device according to claim 1 ;
A display device comprising the display panel. A program for causing a computer to function as the electronic device according to claim 1. A control method for an electronic device that stores candidate image data representing a plurality of candidate images having different luminance distributions, comprising:
The electronic device includes:
calculating an accumulated load for each pixel by accumulating a load for driving the pixel over time;
When a specified active event is not detected continuously for a specified period of time or more,
selecting, as a background image, a candidate image that improves the uniformity of the accumulated load with a higher priority;
displaying the background image on a display panel ;
In the selecting step,
Calculating a correlation coefficient between the cumulative load and brightness for each region of the candidate image;
A candidate image having a smaller correlation coefficient is preferentially selected as the background image.
Control methods.

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