JP4712005B2 - Electronic device, power control method for electronic device, and program executed by computer - Google Patents

Description

  The present invention relates to an electronic device, a power control method for the electronic device, and a program to be executed by a computer. Specifically, the electronic device drives a display panel using a battery as a power source, a power control method for the electronic device, and a computer. Relates to a program to be executed.

  2. Description of the Related Art In recent years, various types of battery-driven devices have appeared in the field of various electronic devices as the devices have become smaller, and user demand for battery driving time has been increasing year by year. In such a battery-driven device, the driving time is extended by making use of various power saving functions. For example, in a so-called notebook personal computer (hereinafter referred to as “notebook PC”), when there is no operation for a certain period of time, the processing speed is reduced, or the display on the liquid crystal display (LCD) is temporarily stopped. The method is adopted.

  In addition, the user can determine the system operation mode during normal operation by setting the hardware switch or the setup menu. For example, there is a setting that allows the CPU clock speed to be reduced, for example. . In addition, when the user needs to use the device for a long time, the user can use the power saving function as described above to the maximum, or reduce the backlight brightness of the liquid crystal display panel by adjusting the volume. It has become.

  Recently, however, notebook PCs have become more and more multifunctional, and the number of devices that can be installed has increased and the settings have become complicated. There is a case where power is wasted unnecessarily. Among the devices whose settings can be changed, the backlight of the liquid crystal display panel has a particularly large power consumption range.

  For example, there are situations where the user needs to use a notebook PC for a few minutes during a meeting or when going out. 2. Description of the Related Art Conventionally, there is known an apparatus that executes a minimum power consumption mode when a user presses a power saving button. However, when the battery usable time is up to 1 hour, the minimum power consumption mode sets the power to use the battery for 1 hour. And may reduce usability. For example, in the lowest power consumption mode, a situation occurs in which the backlight luminance is lowered more than necessary, and the user must operate while looking at a dark monitor. Here, the luminance (brightness) of the liquid crystal display panel is largely related to usability.

  For example, the following are known as power consumption control techniques for notebook PCs. In the power control system of Patent Document 1, when a user sets a desired operation time in a battery-driven electronic device, the microcomputer stores this in the memory as operation time data, and the microcomputer detects a charging current. Based on the data obtained from the device, the capacity of the battery is stored in the memory as remaining amount data, and in the memory, a power consumption table indicating the correspondence between each operation mode and power consumption is stored for each device, At the start of the operation of the apparatus, the microcomputer calculates each power consumption value so that the battery lasts until the operation time elapses and each device can exhibit the maximum performance within the range. A technique for determining and setting the operation mode is disclosed.

  Further, in the backlight luminance control method of Patent Document 2, control parameters are stored in order to control backlight luminance and contrast corresponding to various LCD panels, and detection is performed by detecting the type of the LCD panel. Based on the control parameters for the LCD panel corresponding to the type, the default values for backlight brightness and contrast volume control are automatically set, and when the backlight brightness and contrast are instructed to change, detection is performed. A technique is disclosed in which backlight luminance and contrast change processing is performed in accordance with the change instruction with reference to the LCD panel control parameter corresponding to the type.

Japanese Patent Laid-Open No. 5-307431 JP 11-326866 A

  However, the above-mentioned patent documents do not specifically describe a power control method of the display panel for sustaining the battery without reducing usability according to the user's desired battery time.

  The present invention has been made in view of the above, and in an electronic device in which a display panel is driven using a battery as a power source, the battery can be maintained without reducing usability as much as possible during a user's desired usage time. It is an object of the present invention to provide an electronic device capable of performing the above, a power control method for the electronic device, and a program executed by a computer.

  In order to solve the above-described problems and achieve the object, the present invention provides an inter-brightness consumption registering a power consumption delta between each brightness of the display panel in an electronic device that drives the display panel using a battery as a power source. A power delta table; brightness setting means for setting the brightness of the display panel; battery remaining capacity detection means for detecting the remaining battery capacity; and desired operation time setting for setting a desired operation time in response to a user operation. And the brightness setting means includes a desired operation time set by the desired operation time setting means, a remaining battery level detected by the remaining battery level detection means, and an inter-brightness power consumption delta table. And the brightness of the display panel is set based on the data.

  According to a preferred aspect of the present invention, the brightness setting means calculates a target power consumption based on a desired operation time of the battery and the remaining battery level, and calculates a current average power consumption and the target power consumption. Is calculated as a target reduced power, and the luminance between the luminances is reduced sequentially from the current luminance by referring to the inter-brightness power consumption delta table, and the total of the luminance power consumption delta between the luminances reaches the target differential power. Is preferably set on the panel.

  According to a preferred aspect of the present invention, the inter-brightness power consumption delta table registers the power consumption delta between the respective luminances for each size of the display panel, and detects the size of the display panel. Panel size detection means, wherein the brightness setting means is configured to display the display based on the desired operation time of the battery, the remaining battery level, and the detected panel size data in the inter-brightness power consumption delta table. It is desirable to set the panel brightness.

  Further, according to a preferred aspect of the present invention, the power consumption delta between the respective luminances for each size of the display panel registered in the inter-luminance power consumption delta table is an average value of display panels of a plurality of manufacturers. It is desirable that

  According to a preferred aspect of the present invention, it is desirable that the display panel is a liquid crystal display panel.

  In order to solve the above-described problems and achieve the object of the present invention, the present invention provides a brightness setting for setting the brightness of the display panel in a power control method for an electronic device that drives the display panel using a battery as a power source. A battery remaining amount detecting step for detecting the remaining amount of the battery, and a desired operating time setting step for setting a desired operating time of the battery in response to a user operation. In the luminance setting step, Based on the set desired operation time of the battery, the detected remaining battery level, and the data of the power consumption delta table between brightnesses in which the power consumption delta between the brightnesses of the display panel is registered, The brightness of the display panel is set.

  In order to solve the above-described problems and achieve the object of the present invention, the present invention provides a brightness for setting the brightness of the display panel in a program mounted on an electronic device that drives the display panel using a battery as a power source. Causing the computer to execute a setting step, a battery remaining amount detecting step for detecting the remaining amount of the battery, and a desired operating time setting step for setting a desired operating time of the battery in response to a user operation, In the setting step, the set desired battery operation time, the detected remaining battery level, and the data of the inter-brightness power consumption delta table in which the power consumption delta between each brightness of the display panel is registered. Based on this, the brightness of the display panel is set.

  The present invention relates to an inter-brightness power consumption delta table in which power consumption delta is registered between each brightness of the display panel, and a brightness for setting the brightness of the display panel in an electronic device that drives the display panel using a battery as a power source. Setting means; battery remaining amount detecting means for detecting the remaining amount of the battery; and desired operation time setting means for setting a desired operation time in response to a user operation. Since the brightness of the display panel is set based on the operation time, the remaining battery level, and the data of the power consumption delta table between brightnesses, an electronic device that drives the display panel using the battery as a power source Therefore, the battery can be maintained during the user's desired usage time without reducing usability as much as possible.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same. In the following embodiments, a notebook PC will be described as an example of an electronic apparatus according to the present invention.

  FIG. 1 is a diagram showing an external configuration of a notebook PC to which an electronic device according to the present invention is applied. In the figure, 1 is a notebook PC, 10 is a personal computer main body, 11 is an input unit having a keyboard and a slice pad, 30 is a display unit, 31 is a liquid crystal display panel, and 27 is a display unit 13 relative to the personal computer main body 11. The rotation support part which supports so that rotation is possible is shown.

  FIG. 2 is a diagram illustrating a schematic hardware configuration example of the notebook PC of FIG. As shown in the figure, the notebook PC 1 includes a CPU 12, a CPU bridge 13, a main memory 14, a video controller 15, a liquid crystal display panel 31, an I / O bridge 17, a wireless module 18, an HDD (hard disk) 19, a ROM 20, An I / O controller 21, an input unit 11, an embedded controller 22, a power controller 23, a DC-DC converter 24, a battery 25, an AC adapter 26, and the like are provided.

  The CPU 12 has a function of controlling the entire PC by the OS stored in the HDD 19 connected via the CPU bridge 13 and the I / O bridge 17 and executing processing based on various programs stored in the HDD 19. Control. The ROM 20 stores the BIOS 41 and data. The main memory 14 is composed of, for example, a RAM, and has a memory function used as a work area when the CPU 12 executes various programs.

  The display unit 30 includes a liquid crystal display panel (hereinafter referred to as “panel”) 31, a backlight (not shown), an inverter (not shown) for driving the backlight, a driver circuit for driving the liquid crystal display panel 30, and the like. Yes. A liquid crystal display panel (hereinafter referred to as “panel”) 31 has a function of displaying menus, statuses, display transitions, and the like associated with various processes of the CPU 12. The video controller 15 controls the inverter to adjust the luminance of the backlight according to the control of the CPU 12, and sends a video signal to the driver circuit to control the display on the liquid crystal display panel 31. The wireless module 13 controls a function of connecting to a network such as the Internet or connecting communication with other devices using infrared rays.

  The input unit 11 includes a keyboard composed of various keys for inputting characters, commands, and the like, a slice pad for moving a cursor on the screen, and selecting various menus. The I / O controller 21 detects an input operation of the input unit 11 and outputs it to the CPU 12.

  The hard disk 19 has a function of storing an OS, a power manager (OS application), a power manager driver, a graphics driver, various application programs, and the like for controlling the entire notebook PC.

  The AC adapter 26 is connected to a commercial power source, converts an AC voltage into a DC voltage, and outputs the DC voltage to the DC-DC converter 24. The DC-DC converter 24 converts the DC voltage supplied from the AC adapter 26 into a predetermined voltage, supplies power to each unit, and charges the battery 25. The battery 25 is charged by the DC-DC converter 24 and supplies the charged voltage to each unit. The battery 25 is used when the AC adapter 26 is not connected to a commercial power source. The power controller 23 controls the operation of the DC-DC converter 24. The embedded controller 22 controls the operation of the battery 25.

  Functions realized by the CPU 12 reading out a Power Manager (OS Application), a Power Manager driver, and a Graphics driver stored in the hard disk 19 will be described with reference to FIGS.

  FIG. 3 is a diagram showing a system configuration (software configuration) of the power control system of the notebook PC of FIG. In FIG. 3, the BIOS 41 stores an inter-brightness power consumption delta table 42. FIG. 4 is a diagram illustrating an example of the inter-brightness power consumption delta table 42. As shown in the figure, the inter-brightness power consumption delta table 42 includes each panel size (14 ″ XGA, 14 ″ SXGA +, 15 ″ WXGA, 15 ″ WSXGA +, 15 ″ WUXGA +) and each luminance (L0−L1, L1-L2, L2-L3, L3-L4, L4-L5, L5-L6, L6-L7, L7-L8, L8-L9, L9-L10, L10-L11, L12-L13, L14-L15) A consumption delta is associated and registered.

  The BIOS 41 functions as a panel size detection unit that detects the size of the panel 31 being used. The BIOS 41 reads the EDID from the panel 31 to detect the panel size, reads out the panel size data used from the inter-brightness power consumption delta table 42, and outputs the data to the power manager 51 via the power management driver 52.

  The power manager 51 functions as a luminance setting unit that sets the luminance of the panel 31 and a desired operation time setting unit that sets a desired operation time in response to a user operation. FIG. 5 is a diagram illustrating an example of a desired battery operation time setting screen displayed on the panel 31 by the power manager 51. As shown in FIG. 5, on the battery desired operation time setting screen, the size of the used panel, the current usable time of the battery 41, and the desired operation time input field 60 are displayed. The user operates the input unit 11 and inputs the desired operation time of the battery 25 in the desired operation time input field 60.

  The power manager 51 requests battery information (remaining battery capacity, average power consumption (for example, average value of power consumption for the past five minutes)) from the power manager driver 52 when the user requests the desired usage time. Battery information (remaining battery capacity, average power consumption) is received. In addition, the power manager 51 acquires the current luminance information from the graphics driver 53 and receives the inter-brightness power consumption delta data of the panel size being used from the BIOS 41 via the power manager driver 52. The power manager 51 calculates the brightness of the panel 31 based on the desired operation time of the battery 25, battery information, and data in the power consumption delta table 42 between brightnesses, and outputs a brightness change request to the graphics driver 53. . The Graphics driver 53 instructs the video controller 15 to change the luminance when there is a luminance change request from the power manager 51. The video controller 15 changes the brightness of the panel 31 in accordance with the brightness change instruction from the Graphics driver 53.

  The power manager driver 52 acquires battery information via the embedded controller 22 in accordance with the battery request of the power manager 51 and outputs the acquired battery information (remaining battery capacity and average power consumption) to the power manager 51. The power manager driver 52 functions as a remaining battery level detection unit that detects battery information (remaining battery capacity and average power consumption) of the battery 25.

  Here, with reference to FIGS. 6 to 8, the inter-brightness power consumption delta table 42 and the inverter will be described. Conventionally, when the luminance is changed from the current luminance, the absolute value of the power consumption at each luminance is used to predict the battery life, and thus the battery life cannot be predicted with high accuracy. Therefore, in the present embodiment, by using the power consumption delta between the respective luminances stored in the inter-brightness power delta table 42, to which luminance the current luminance can be reduced to achieve the battery life desired by the user. Is calculated with high accuracy.

  A panel and the inverter which drives a panel are provided by many manufacturers. The inverter provided by the manufacturer supports a plurality of manufacturers' panels. FIGS. 6 and 7 show the 14 ″ XGA with inverters of each manufacturer (Company A, Company B), panels of each manufacturer (Company X, Company Y, Company Z), and brightness (L0 to L15). It is an example of the table | surface and graph which show the relationship with power consumption (absolute value).

  As shown in FIGS. 6 and 7, there is a large variation in the power consumption (absolute value) of the inverter at each luminance depending on the panel manufacturer. Here, when a luminance power consumption table is provided for each panel manufacturer, the amount of data increases, and as described above, the battery life cannot be predicted with high accuracy using the absolute value of power consumption. Furthermore, in EDID, since it is impossible to discriminate between an inverter manufacturer or a panel manufacturer, even if a luminance power consumption table is stored for each panel manufacturer, the power information cannot be used.

  The inventor of the present application pays attention to the power consumption delta between the brightnesses of each manufacturer's panel, and has found that each panel manufacturer has almost the same value. FIG. 8 shows an example of an inverter of each manufacturer (Company A, Company B), a panel of each manufacturer (Company X, Company Y, Company Z), and luminance (L0-L1, L1-L2,. L2-L3, L3-L4, L4-L5, L5-L6, L6-L7, L7-L8, L8-L9, L9-L10, L10-L11, L12-L13, L14-L15) As shown in the figure, in the 14 ″ XGA panel, the power consumption delta between each luminance is the inverter manufacturer (Company A, Company B) and panel manufacturer (Company X, Company Y, Company Z). By using the average value of power consumption delta between each luminance, it is possible to support inverter manufacturers (Company A, Company B) and panel manufacturers (Company X, Company Y, Company Z). It is. Similarly, although not shown in the figure, the power consumption delta between the brightness of each inverter manufacturer and each panel manufacturer is also obtained for panels of other sizes (14 ″ SXGA +, 15 ″ WXGA, 15 ″ WSXGA +, 15 ″ WUXGA +). An average value can be used.

  The operation of the power manager 51 in FIG. 3 will be described with reference to FIGS. FIG. 9 is a flowchart for explaining an operation in which the power manager 51 acquires battery information. In FIG. 9, first, the power manager 51 requests battery information from the power manager driver 52 (step S1). The power manager driver 52 communicates with the battery 25 via the I2C BUS (step S2), and acquires battery information (remaining battery level and average power consumption) of the battery 25 (step S3). Then, the power manager driver 52 notifies the power manager 51 of battery information (remaining battery level and average power consumption) (step S4).

  FIG. 10 is a flowchart for explaining the operation in which the power manager 51 controls the brightness of the panel 31 based on the desired operation time of the battery 25 set by the user. In the figure, the user inputs the desired operation time of the battery 25 on the battery desired operation time setting screen (see FIG. 5) (step S11). The power manager 51 calculates target power consumption based on the desired operation time and the remaining battery level (step S12). The power manager 51 calculates the difference between the current average power consumption and the target power consumption as the target reduction power (step S13). With reference to the inter-brightness power consumption delta table 42, the brightness level is lowered by one from the current brightness (step S14), and it is determined whether or not the sum of the inter-brightness power consumption delta has reached the target differential power (step S14). S15) When the total luminance power consumption delta does not reach the target differential power (“No” in step S15), the process returns to step S14, while the total luminance power consumption delta is the target differential power. If it has reached (“Yes” in step S15), the luminance of the panel 31 is changed to this luminance (target luminance) (step S16).

  The flow of FIG. 10 will be described using a specific example. Here, as shown in FIG. 5, the panel size is 14 ″ XGA, the current luminance is L15, the average power consumption for the past 5 minutes is 13 W, the remaining battery power is 22 WH (40% of 6 cells), and the remaining battery time. Is a case where the user inputs the desired operation time “2 hours” when 1 hour 44 minutes.

  The power manager 51 calculates the target power consumption (22WH / 2.0H = 11.2W) based on the desired operation time 2H and the remaining battery capacity 22WH (step S12). The difference between the current average power consumption 13W and the target power consumption 11.2W is calculated as the target reduction power 1.8W (step S13). With reference to the inter-brightness power consumption delta table 42, when the brightness level is lowered from the current brightness L15 until the total S of the inter-brightness power consumption delta reaches the target differential power 1.8W (steps S14 and S15). When the luminance level is lowered to 6, the total power consumption delta between luminances becomes S = 0.27 + 0.25 + 0.23 + 0.22 + 0.20 + 0.18 + 0.17 + 0.15 + 0.13 = 1.8. The brightness of the panel 31 is changed to the brightness 6 (step S6).

  As described above, according to the present embodiment, the inter-brightness power consumption delta table 42 in which the power consumption delta between the respective luminances of the panel 31 is registered, the power manager driver 52 that detects the remaining amount of the battery 25, A power manager 51 for setting the brightness of the panel 31, and the power manager 51 is configured based on the user's desired operation time of the battery 25, the remaining battery level, and the data in the power consumption delta table 42 between brightness levels of the panel 31. Since the brightness is set, in the electronic device that drives the panel using the battery as a power source, the battery can be maintained during the user's desired usage time without reducing usability as much as possible.

  Further, according to the present embodiment, the power manager 51 calculates the target power consumption based on the desired operation time and the remaining battery level, and calculates the difference between the current average power consumption and the target power consumption as the target reduction power. Then, referring to the inter-brightness power consumption delta table 42, the brightness is sequentially decreased from the current brightness, and the brightness at which the sum of the inter-brightness power consumption delta reaches the target differential power is set to the panel 31. Therefore, it is possible to set the maximum luminance that can sustain the battery during the user's desired operation time.

  Further, according to the present embodiment, the power consumption delta table between luminances registers the power consumption delta between the respective luminances for each size of the panel 31, and the BIOS 41 detects the size of the panel 31 by EDID. Since the power manager 51 sets the panel brightness based on the desired operation time, the remaining battery level, and the panel size data detected in the power consumption delta table between brightnesses, the plurality of panel sizes are set. It becomes possible to cope with.

  In addition, according to the present embodiment, the average value of the panels of a plurality of manufacturers is registered in the inter-brightness power consumption delta table 42 as the power consumption delta between the respective luminances for each panel size. It is possible to reduce the data amount of the power consumption delta table between luminances.

  In the above embodiment, the brightness of the panel 31 for securing the desired operation time input by the user on the battery desired operation time setting screen is calculated and set with reference to the power consumption delta table. The present invention is not limited to this. For example, the power manager 51 refers to the inter-brightness power consumption delta table 42 to calculate the battery usable time at each brightness of the panel 31, and lists the battery usable time at each brightness on the brightness setting screen illustrated in FIG. 11. May be displayed, and the user may select the brightness on this screen in consideration of the brightness and the battery usable time. Thereby, the user can select the brightness of the screen and the battery usable time.

  In the above embodiment, a liquid crystal display panel is used as the display panel. However, the present invention is not limited to this. For example, another display panel using plasma, organic EL, LED, or the like is used. You may decide to do it. In the above embodiments, a notebook PC has been described as an example of an electronic apparatus according to the present invention. However, the present invention is not limited to this, and all electronic devices that drive a display panel using a battery as a power source. For example, the present invention can be applied to electronic devices such as PDAs, portable terminals, and digital cameras.

  The electronic device, the power control method for the electronic device, and the program executed by the computer according to the present invention can be used for various electronic devices that drive the display panel using a battery as a power source.

It is a figure which shows the external appearance structure of the notebook type PC which concerns on a present Example. FIG. 2 is a diagram illustrating a schematic hardware configuration example of the notebook PC of FIG. 1. It is a figure which shows the system structure (software structure) in case notebook type PC controls the brightness | luminance of a panel. It is a figure which shows an example of the power consumption delta table between brightness | luminances. It is a figure which shows an example of a battery desired operation time setting screen. It is an example of the table | surface which shows the relationship between each manufacturer's inverter, each manufacturer's panel, and power consumption (absolute value) in each brightness | luminance regarding 14 "XGA. It is an example of the graph which shows the relationship between each manufacturer's inverter, each manufacturer's panel, and power consumption (absolute value) in each brightness | luminance regarding 14 "XGA. It is a table | surface which shows the relationship of the power consumption delta between each manufacturer's inverter, each manufacturer's panel, and each brightness | luminance regarding 14 "XGA. It is a flowchart for demonstrating the operation | movement which Power Manager acquires battery information. It is a flowchart for demonstrating the operation | movement which Power Manager controls the brightness | luminance of a panel. It is a figure which shows an example of a brightness | luminance setting screen.

Explanation of symbols

1 Notebook PC
10 PC Main Body 11 Input Unit 12 CPU
13 CPU Bridge 14 Main Memory 15 Video Controller 16 Inverter 17 I / O Bridge 18 Wireless Module 19 HDD (Hard Disk)
20 ROM
21 I / O controller 22 Embedded controller 23 Power controller 24 DC-DC converter 25 Battery 26 AC adapter 27 Rotation support part 30 Display part 31 Liquid crystal display panel 41 BIOS
42 Power consumption delta table between luminances 51 Power Manager
52 Power Manager Driver 53 Graphics Driver

Claims (5)

In an electronic device that drives a display panel using a battery as a power source,
A power consumption delta table between brightnesses, in which power consumption deltas between brightnesses for each size of the display panel are registered,
The power consumption delta between each brightness for each size of the display panel is an average value of display panels of a plurality of manufacturers,
Brightness setting means for setting the brightness of the display panel; battery remaining amount detection means for detecting the remaining amount of the battery;
A desired operation time setting means for setting a desired operation time of the battery in response to a user operation;
Panel size detection means for detecting the size of the display panel;
With
The brightness setting means includes a desired operation time of the battery set by the desired operation time setting means, a remaining battery level detected by the remaining battery level detection means, and a display panel detected by the panel size detection means. The display device brightness is set on the basis of the inter-brightness power consumption delta table data corresponding to the size of the display device. The brightness setting means includes
Based on the desired operating time of the battery and the remaining battery level, the target power consumption is calculated,
Calculate the difference between the current average power consumption and the target power consumption as the target reduction power,
With reference to the inter-brightness power consumption delta table, the brightness is sequentially decreased from the current brightness, and the brightness at which the sum of the inter-brightness power consumption delta reaches the target differential power is set in the panel, The electronic device according to claim 1.   The electronic device according to claim 1, wherein the display panel is a liquid crystal display panel. In a power control method of an electronic device that drives a display panel using a battery as a power source,
A luminance setting step for setting the luminance of the display panel;
A battery remaining amount detecting step for detecting the remaining amount of the battery;
A desired operation time setting step for setting a desired operation time in response to a user operation;
A panel size detection step for detecting the size of the display panel;
Including
In the luminance setting step, the power consumption between luminances in which the desired operation time of the set battery, the detected remaining battery level, and the power consumption delta between the luminances for each size of the display panel are registered. Based on the data corresponding to the size of the display panel detected by the panel size detecting means in the delta table, the brightness of the display panel is set, and the power consumption between each brightness for each size of the display panel Delta is an average value of display panels of a plurality of manufacturers . In a program installed in an electronic device that drives a display panel using a battery as a power source,
A luminance setting step for setting the luminance of the display panel;
A battery remaining amount detecting step for detecting the remaining amount of the battery;
A desired operation time setting step for setting a desired operation time in response to a user operation;
A panel size detection step for detecting the size of the display panel;
To the computer,
In the brightness setting step, the power consumption delta between brightnesses in which the desired operation time of the set battery, the detected remaining battery power, and the power consumption delta between the brightnesses for each size of the display panel are registered. The brightness of the display panel is set based on the data corresponding to the size of the display panel detected by the panel size detecting means in the table, and the power consumption delta between each brightness for each size of the display panel Is a computer-executable program that is an average value of display panels of a plurality of manufacturers .

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