JP2008185750A - Portable electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide portable electronic equipment capable of displaying the remaining power of a battery delicately by considering power consumption used to display an image. <P>SOLUTION: The portable electronic equipment comprises: a display part 15 which has a plurality of display elements and performs display by controlling a light-emission state at each of the plurality of display elements; a control part 12 which performs a control so as to draw a prescribed image on the display part 15; the battery 17 which performs power supply to the display part 15 and the control part 12, wherein the control part 12 monitors the state of the battery 17, when the display of an image is performed by the display part 15 upon the calculation of the remaining power of the battery 17, sets a correction value based on display colors of the displayed image, specifies the remaining power of the battery 17 by using the correction value and a voltage value presenting the state of the battery 17 and displays the specified remaining power on the display part 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to a portable electronic device suitable for use in a mobile phone having an organic EL (Organic Electro Luminescence) as a display device.

  Currently, LCD (Liquid Crystal Display) is the mainstream display device for mobile phones. Recently, however, organic EL (hereinafter referred to as OLED (Organic Light-Emitted Diode)) has attracted attention, and the LCD has. As a new display device that combines the features of high resolution, thin and light weight with the features of high contrast and wide viewing angle of CRT (Cathode Ray tube), its adoption has been studied.

OLED is a self-luminous display device like CRT and plasma, and an anode electrode made of ITO (Indium Tin Oxide) is formed on a glass substrate, and a hole transport layer, a light emitting layer, and an electron transport layer are formed on the anode electrode. A cathode electrode made of an organic layer and a metal electrode is formed.
The LCD is controlled by the amount of light incident on the liquid crystal panel by the backlight, whereas the OLED is controlled by the current flowing through the organic layer, so that the non-light emitting part is completely black and the contrast is high. It is very expensive.

By the way, the battery remaining amount display in the above-mentioned mobile phone is the simplest and cheapest method that monitors the battery voltage, calculates the remaining amount according to the voltage, and displays the remaining battery amount on the display device. ing.
When an LCD is used as the display device, the power consumption of the backlight is particularly high, and it becomes difficult to read the correct battery voltage value due to voltage fluctuations when the backlight is lit. Was used to determine the remaining battery level. In addition, the brightness of the LCD is varied by limiting the current that flows to the backlight. In this case, power consumption also changes greatly, and thus it is necessary to change the correction value according to the current value that flows to the backlight.

For this reason, conventionally, a portable communication terminal with a battery remaining level display function that prepares a table storing the average current consumption for each device and displays the remaining battery level with reference to this table (see, for example, Patent Document 1). An electronic device (see, for example, Patent Document 2) that specifies the remaining battery level regardless of the load current by estimating the voltage drop due to the load current and correcting the terminal voltage of the power source to obtain the power source voltage is proposed. ing.
JP 2002-335307 A JP 2004-69573 A

  As described above, when an LCD is used as the display device, it is possible to calculate a more accurate voltage threshold only by providing a correction value for each current value flowing through the backlight.

  However, the techniques disclosed in Patent Documents 1 and 2 are assumed to be LCDs as display devices, and OLEDs having no backlight are not considered.

  SUMMARY An advantage of some aspects of the invention is that it provides a portable electronic device capable of performing detailed battery remaining amount display in consideration of power consumption by a display device.

  A portable electronic device according to the present invention has a plurality of display elements, and displays a display by controlling a light emission state for each of the plurality of display elements, and causes the display to draw a predetermined image. A control unit for controlling, and a battery for supplying power to the display unit and the control unit, wherein the control unit monitors the state of the battery and calculates the remaining amount of the battery by the display unit. When an image is displayed, a correction value is set based on the display color of the displayed image, and the remaining battery level is determined using at least the correction value and a value indicating the state of the battery. And the specified remaining amount is displayed on the display unit.

  Further, in the portable electronic device according to the present invention, the display unit forms one pixel by the plurality of light emitting elements, and generates a color for each pixel by adjusting a light amount for each of the plurality of light emitting elements. However, the screen display may be performed by the aggregate of the pixels.

  Further, in the portable electronic device according to the present invention, the plurality of light emitting elements are composed of light emitting elements of three primary colors R, G, and B, and the control unit outputs a drawing signal that instructs the display unit to draw an image. A single light emission state for each of the R, G, and B light emitting elements is extracted with reference to a part, and a correction value is set by calculating a light emission ratio based on the extracted single light emission state. Also good.

  In the portable electronic device according to the present invention, the control unit compares a value calculated based on at least a value indicating the state of the battery and the correction value with a preset threshold value, thereby remaining battery power. An amount level may be determined, and the remaining amount level may be displayed on the display unit with a pictorial symbol.

  ADVANTAGE OF THE INVENTION According to this invention, the portable electronic device which can perform a detailed battery remaining amount display in consideration of the power consumption by a display device can be provided.

FIG. 1 is a block diagram showing an internal configuration of a portable electronic device according to an embodiment of the present invention. Here, a mobile phone is exemplified as the portable electronic device.
As shown in FIG. 1, the mobile phone includes a communication unit 11, a control unit 12, a storage unit 13, a voice processing unit 14, a display unit 15, an operation unit 16, and a battery 17. .

  The communication unit 11 transmits and receives radio signals to and from the base station via a communication line using a channel assigned by any one of base stations (not shown).

  The control unit 12 has a function of controlling the display unit 15 to draw a predetermined image. Specifically, the control unit 12 monitors the state of the battery 17 and calculates the remaining battery level. 15, when an image is displayed, a correction value is set based on the display color of the displayed image, and the battery 17 uses the correction value and a voltage value indicating the state of the battery 17. The remaining amount is specified, and the specified remaining amount is displayed on the display unit 15. Details will be described later.

  The storage unit 13 is assigned a storage area in which a program executed by the control unit 12, a table referred to by the program, or data used as a work area is stored. For example, a nonvolatile storage device (nonvolatile Volatile semiconductor memory, hard disk device, optical disk device, etc.) or a randomly accessible storage device (eg, SRAM, DRAM).

The audio processing unit 14 processes an audio signal output from a speaker (SP) and an audio signal input via a microphone (MIC, hereinafter referred to as a microphone).
That is, the audio processing unit 14 amplifies the audio input from the microphone, performs analog / digital conversion, further performs signal processing such as encoding, converts it into digital audio data, and outputs it to the control unit 12.
The audio processing unit 14 performs signal processing such as decoding, digital / analog conversion, and amplification on the audio data supplied from the control unit 12, converts the audio data into an analog audio signal, and outputs the analog audio signal to the speaker.

The display unit 15 converts display information generated by the control unit 12 into a video signal and displays it. For example, the phone number of the callee when making a mobile phone call, the phone number of the callee at the time of incoming call, the contents of received or sent mail, the date, time, antenna level, remaining battery level, etc., successful call, standby screen, etc. Displays various information and images.
Here, as the display unit 15, a plurality of light emitting elements (one provided for each of the three primary colors R, G, and B) constitute one pixel (display element), and a large number of such display elements are arranged vertically and horizontally. An organic EL display configured to display a screen by controlling the light emission state of each of the plurality of display elements, specifically, one pixel is configured by three types of light emitting elements, A so-called organic EL display device (OLED panel) that generates a color for each pixel by adjusting the amount of light for each of the plurality of light emitting elements and performs screen display using the aggregate of the pixels is used.
The OLED panel forms one pixel with a plurality of light emitting elements, generates a color for each pixel by adjusting the amount of light for each of the plurality of light emitting elements, and performs screen display with the aggregate of the pixels.

  The above-described control unit 12 extracts a single light emission state for each of the R, G, and B light-emitting elements constituting the display unit 15 with reference to a part of the drawing signal that instructs the display unit 15 to draw an image, A light emission ratio is calculated based on the extracted single light emission state, and a correction value is set. The control unit 12 also determines the remaining level of the battery 17 by comparing a value obtained by combining the voltage value indicating the state of the battery 17 and the correction value with a threshold value stored in the storage unit 13. The level is displayed on the display unit 15 with a pictorial symbol (battery remaining amount pictograph). Details will be described later.

For example, as shown in FIG. 2, the OLED panel includes a timing control unit 151, a column driving unit 152, a row driving unit 153, a power supply unit 154, and an OLED panel main body 155. .
The video signal (VIDEO) output from the drawing / display control unit 121 of the control unit 12 is separated into an RGB signal, a vertical synchronization (VD), and a horizontal synchronization signal (HD) by the timing control unit 151. Among these signals, the RGB signals are once held in analog latches by the column driving unit 152, and then output in parallel for the number of columns of the OLED panel main body 155 at a specified timing. Each output signal is converted from a voltage to a current value to drive the column at a constant current. Thereby, the display is updated every predetermined cycle.

  VD and HD are converted to a predetermined voltage by the row driving unit 153, and determine the ON or OFF state of the pixel selected by the constant current signal output from the column. For example, assuming an OLED panel body 155 having m pixels in the horizontal direction and n pixels in the vertical direction, the OLED panel main body 155 has m column electrodes and n row electrodes. The n row electrodes are sequentially scanned from the first row to the n-th row of the row electrodes, and are activated by a constant current signal driven through the column electrodes only for a certain operation time. In this way, sequential scanning is switched from the first row electrode to the lowest row electrode in the nth row, and the address for one screen is updated. An image for one screen generated by the scanning pulse train from the first row to the n-th row at this time is called a frame, and it is necessary to repeat this screen scanning in order to continuously display the image.

  Returning to FIG. The operation unit 16 includes keys to which various functions such as a power key, a call key, a numeric key, a character key, a direction key, a determination key, and a call key are assigned, and these keys are operated by the user. If so, a signal corresponding to the operation content is generated and input to the control unit 12 as a user instruction.

  FIG. 3 is a block diagram showing an expanded function of the internal configuration of the control unit 12 shown in FIG. As shown in FIG. 3, the control unit 12 includes a main control unit 120, an image acquisition unit 121, a light emission ratio calculation unit 122, a power consumption ratio calculation unit 123, a table index unit 124, and a correction value acquisition unit. 125, a comparison calculation unit 126, a battery voltage monitoring unit 127, and a pictogram drawing / display control unit 128.

  When the main control unit 120 and the control center of the portable electronic device according to the present invention are used, the state of the battery 17 is monitored, and when the remaining amount of the battery 17 is calculated, the display unit 15 displays an image. The correction value is set based on the display color of the displayed image, the remaining amount of the battery 17 is specified using the correction value and the voltage value indicating the state of the battery 17, and the specified remaining amount is determined. In order to realize the function as the control unit 12 displayed on the display unit 15, an image acquisition unit 121, a light emission ratio calculation unit 122, a power consumption ratio calculation unit 123, a table index unit 124, a correction value acquisition unit 125, and a comparison described later. The sequence control of the calculating part 126, the battery voltage monitoring part 127, and the pictogram drawing / display control part 128 is performed.

  The image acquisition unit 121 acquires image data in units of blocks constituting the display screen from the image storage area 130 allocated and temporarily stored in the storage unit 13 and supplies the acquired image data to the light emission ratio calculation unit 122. The light emission ratio calculation unit 122 scans the above-described image data in units of blocks, counts the number of lighting of the RGB light emitting elements in the display screen, and supplies the counted number to the power consumption ratio calculation unit 123.

  The power consumption ratio calculation unit 123 refers to the number of lighting of the RGB light emitting elements in the display screen counted by the light emission ratio calculation unit 122 and the power consumption ratio definition table 131 for each emission color allocated and registered in the storage unit 13. The power consumption rate in RGB units in the display screen and the power consumption rate of the entire display screen are calculated by multiplying the default values obtained in this way and supplied to the table index unit 124.

  Based on the power consumption ratio of the entire display screen calculated by the power consumption ratio calculation section 123, the table index section 124 indexes the power consumption ratio table 132 by lighting level allocated and stored in the storage section 13 to obtain the lighting level. The power consumption rate data defined accordingly is acquired and supplied to the correction value acquisition unit 125. The correction value acquisition unit 125 acquires a corresponding correction value by referring to the correction value table 133 allocated and stored in the storage unit 13 based on the power consumption rate data based on the lighting level acquired by the table index unit 124. It supplies to the comparison calculating part 126.

  In addition to the correction value acquired by the correction value acquisition unit 125, the comparison arithmetic unit 126 is supplied with the voltage value of the battery 17 measured by the battery voltage monitoring unit 127. The comparison calculation unit 126 adds the battery voltage supplied from the battery voltage monitoring unit 127 and the correction value acquired by the correction value acquisition unit 125, and assigns the voltage value obtained as a result to the storage unit 13 for storage. The three-step threshold value for pictogram display is compared, and the result is supplied to the pictogram drawing / display controller 128. Needless to say, the battery voltage supplied by the battery voltage monitoring unit 127 may be corrected in consideration of the amount of current consumed by other functional blocks. For example, when wireless communication is performed by the communication unit 11, current consumption of a power amplifier included in the communication unit 11 is very large. Therefore, it is preferable to consider when calculating the remaining battery level. . In addition, the current consumption in the audio processing unit 14 and the speaker SP may be taken into consideration during music reproduction at a large volume, or the current consumption associated with reading and writing of large size data from the storage unit 13 may be taken into consideration. preferable. Therefore, in this case, the control unit 12 monitors the voltage value of the battery 17 itself, and also monitors the current consumption in each block such as the communication unit 11, the audio processing unit 14, and the storage unit 13 and the execution state of the application program. is doing.

  The pictograph drawing / display control unit 128 displays a pictographic image corresponding to the remaining battery level in the display screen storage area 135 allocated to the storage unit 13 according to the comparison result with the threshold supplied by the comparison calculation unit 126. In addition, the data drawn (image including the remaining battery charge) is read in the display screen storage area 135 in synchronization with the display timing of the display unit 15 and displayed on the display unit 15.

  Note that examples of data structures of the light emission color-specific power consumption ratio definition table 131, the lighting level-specific power consumption ratio table 132, and the correction value table 133 that are allocated and stored in the storage unit 13 described above are illustrated in FIGS. Each is shown in FIG. Details will be described later.

  FIG. 4 is a flowchart showing the operation of the portable electronic device according to the embodiment of the present invention. The operation of the mobile phone shown in FIGS. 1 to 3 will be described in detail below with reference to the flowchart shown in FIG. 5 to 7 show data structures of various tables used in the portable electronic device according to the embodiment of the present invention, and FIG. 8 shows an example of a display screen configuration. Is also explained.

  First, under the control of the main control unit 120, the image acquisition unit 121 acquires image data in units of blocks constituting the display screen from the image storage area 130 of the storage unit 13 by thinning-out scanning, and the light emission ratio calculation unit 122. (S401). Here, as shown in FIG. 8, the display unit 15 has a display screen capacity (image storage area 120) of a total of 76,800 pixels, 240 in width and 320 in length, as shown in FIG. 121 obtains an image composed of 32 pixels, which is temporarily stored in the image storage area 130 and has 16 horizontal pixels and 2 vertical pixels as one block, while performing thinning scanning, and supplies the acquired image to the light emission ratio calculating unit 122.

That is, the following sampling process is performed in order to increase the speed of calculation of power consumption while maintaining accuracy. First, on the horizontal axis, out of 240 pixels, 16 pixels per block are divided into 15 blocks. On the vertical axis, since 320 pixels are 2 pixels per block, it is divided into 160 blocks. Then, sampling is performed from some of these blocks. Note that when displaying an image, the outermost block is often not displayed. Therefore, when sampling, information on the outermost block is not used. That is, on the horizontal axis, blocks excluding both ends of 15 blocks are used, and on the vertical axis, blocks excluding the uppermost and lowermost stages of 160 blocks are used.
In this way, the display light emission ratio calculating unit 122 is 3 blocks except 2, 6, 10, and 14 of the horizontal axis block numbers 1 to 15 on the horizontal axis acquired by the image acquisition unit 121 and both ends. A total of 4 blocks are sampled for skipping. Also, on the vertical axis, out of the four blocks targeted on the horizontal axis, the vertical axis block numbers 1 to 160, except for 3, 5, 7,... 157, 159, and the uppermost and lowermost stages are excluded. A total of 80 blocks are sampled for skipping one block. As a result, a total of 320 blocks of 4 blocks on the horizontal axis and 80 blocks on the vertical axis are to be sampled. Since one block is 32 pixels, the number of lighting for each RGB light emitting element used for image display is counted from a total of 1024 pixels, and the light emission ratio is calculated to the power consumption rate calculation unit 123. Supply (S402).

  Note that the light emission ratio calculation unit 122 calculates the light emission ratio by scanning the entire screen (76800 dots), counting the number of lighting for each RGB light emitting element, and executing a process described later. Since the performance of the mobile phone CPU is adversely affected due to a load on the mobile phone, such as slowing down, the light emission ratio of only the average dispersed image acquired by the thinning scan by the screen acquisition unit 121 is calculated here. .

The power consumption ratio calculation unit 123 refers to the number of lighting for each RGB light emitting element in the display screen counted by the light emission ratio calculation unit 122 and the power consumption ratio definition table 131 for each emission color registered in the storage unit 13. By multiplying the obtained default values (R: 0.23, G: 0.26, B: 0.51) respectively, the power consumption rate in RGB units in the display screen and the power consumption of the entire display screen The rate is calculated and supplied to the table index unit 124 (S403).
Specifically, when the light emission ratio calculated by the light emission ratio calculation unit 122 is <R10: G40: B50>, the power consumption ratio calculation unit 123 sets R = 0.23 × 10 [%], G = 0. .26 × 40 [%] and B = 0.51 × 50 [%] are obtained, so that the respective power consumption ratios are 2.3 [%], 10.4 [%], and 25.5 [%]. Therefore, the total power consumption ratio is 2.3 [%] + 10.4 [%] + 25.5 [%] = 38.2 [%].

The light emission ratio calculation unit 122 outputs the power consumption ratio obtained as described above to the table index unit 124. In addition, the lighting level output via the main control unit 120 is supplied to the table index unit 124 as data. Based on the lighting level and the total power consumption ratio calculated by the power consumption ratio calculation unit 123, the table index unit 124 indexes the power consumption ratio table 132 by lighting level in the storage unit 13 (S404). The power consumption rate data defined accordingly is acquired. Here, assuming that the lighting level is “3” and the total power consumption ratio is 60 [%], 36 [%] is indexed according to the power consumption ratio by lighting level table 132 shown in FIG. Supplied to. The lighting level referred to here is the luminance of the display unit 15 that the user adjusts while viewing the display unit 15 by operating the operation unit 16. In this example, the lighting level is from level 0 (darkest) to level 6 (brightest). ) Is adjustable. The adjusted lighting level is stored in a predetermined area of the storage unit 13 by the control unit 12.
The correction value acquisition unit 125 refers to the correction value table 133 of the storage unit 13 based on the power consumption rate data (36 [%]) based on the lighting level acquired by the table index unit 124, and the corresponding correction value, FIG. , The correction value “B” is acquired and supplied to the comparison calculation unit 126 (S405).

In addition to the correction value acquired by the correction value acquisition unit 125, the comparison arithmetic unit 126 is supplied with the voltage value of the battery 17 measured by the battery voltage monitoring unit 127. The comparison calculation unit 126 adds the battery voltage supplied from the battery voltage monitoring unit 127 and the correction value acquired by the correction value acquisition unit 125, and assigns the voltage value obtained as a result to the storage unit 13 for storage. The three-step threshold value for pictogram display is compared, and the result is supplied to the pictogram drawing / display controller 128 (S406).
The pictograph drawing / display control unit 128 displays a pictographic image corresponding to the remaining battery level in the display screen storage area 135 allocated to the storage unit 13 according to the comparison result with the threshold supplied by the comparison calculation unit 126. Data is drawn and data (image including the remaining battery charge) drawn in the display screen storage area 135 in synchronization with the display timing of the display unit 15 is read and displayed on the display unit 15 (S407). And this correction process is performed with a fixed period. If the remaining battery level is to be determined more accurately, it is preferable to perform the correction process for each display update period of the display unit 15, but if it is performed too frequently, the current consumption required for this calculation process will increase. It is preferable to carry out every period. For example, an adverse effect on battery consumption can be reduced by performing the correction process once every time the display update cycle is performed 100 times.

In addition, although the example in which the power consumption ratio calculation unit 123 counts only the number of lighting for each RGB light emitting element is shown, it is preferable to refer to the gradation level of light emission of each light emitting element when counting the number of light emission. . For example, when 63 gradations are given to each light emitting element, the gradation information of each issuing element is acquired and counted when counting the number of lighting of the light emitting elements, and then divided by 63, The power consumption in each display element can be obtained in more detail. That is, when the 63 maximum gradations are turned on, the percentage of the maximum value is calculated as an average of the whole, and this is added to the total power consumption ratio T (w). By multiplying, accurate calculation can be performed in consideration of subtle usage conditions such as the level that is actually dimly lit and the level that is lit very brightly.
Furthermore, in order to compare the total power consumption ratio T (w), the power consumption rate table for each lighting level (FIG. 6) is shown. Actually, however, for each lighting level when T (w) is 100%. Even with the minimum table in which only the power consumption ratio is recorded, the power consumption ratio for each lighting level can be calculated in detail simply by multiplying this by the total power consumption ratio T (w). When the calculation format is used in this way, it is not necessary to have a detailed table, which leads to a reduction in the amount of memory required.

  As described above, when the OLED panel is used as a display device, the power consumption varies greatly depending on the display image in addition to the brightness, unlike the LCD. Therefore, there is a problem that the voltage threshold cannot be set correctly when the OLED panel is used. However, as described above, an accurate voltage threshold is generated by adding image information to the correction value in addition to the lighting level. can do. For this reason, the remaining battery charge is also displayed correctly, and the user can correctly recognize the remaining battery charge. In addition, when acquiring image information, the power consumption ratio to the entire screen can be determined by acquiring only average dispersed pixel information so that the performance of the mobile phone is not adversely affected. It is possible to control without applying.

  In addition, according to the above-described embodiment of the present invention, only the OLED panel is illustrated as the display unit 15, but the present invention can be similarly applied to a self-luminous flat panel such as plasma. Further, according to the above-described embodiment of the present invention, a mobile phone is exemplified as the mobile electronic device. However, the present invention is not limited to the mobile phone, but can be similarly applied to PDAs (Personal Digital Assistants), game machines, PCs, and the like. Is possible. The functions of the constituent blocks of the portable electronic device of the present invention may be realized entirely by software, or at least a part thereof may be realized by hardware. For example, the processing in the main control unit 120, the image acquisition unit 121, the light emission ratio calculation unit 122, the power consumption ratio calculation unit 123, the table index unit 124, the correction value acquisition unit 125, the comparison calculation unit 126, the battery voltage monitoring unit 127, Data processing in the pictogram rendering / display control unit 128 may be realized on a computer by one or a plurality of programs, or at least a part thereof may be realized by hardware.

It is a block diagram which shows the internal structure of the portable electronic device which concerns on embodiment of this invention. It is a figure which shows the internal structure of the OLED panel which comprises the display part shown in FIG. It is a block diagram which shows the internal structure of the control part shown in FIG. It is a flowchart which shows operation | movement of the portable electronic device which concerns on embodiment of this invention. It is a figure which shows an example of the data structure of the power consumption ratio definition table classified by emission color shown in FIG. It is a figure which shows an example of the data structure of the power consumption ratio table classified by lighting level shown in FIG. It is a figure which shows an example of the data structure of the correction value table shown in FIG. It is a figure which shows an example of the display screen structure of the display part shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Communication part, 12 ... Control part, 13 ... Memory | storage part, 14 ... Audio | voice processing part, 15 ... Display part, 16 ... Operation part, 17 ... Battery, 120 ... Main control part, 121 ... Image acquisition part, 122 ... Light emission Ratio calculation unit 123... Power consumption ratio calculation unit 124. Table index unit 125. Correction value acquisition unit 126. Comparison operation unit 127 127 Battery voltage monitoring unit 128 128 Pictograph drawing / display control unit

Claims (4)

A display unit having a plurality of display elements and performing display by controlling the light emission state of each of the plurality of display elements;
A control unit that controls the display unit to draw a predetermined image;
A battery for supplying power to the display unit and the control unit,
The controller is
When the state of the battery is monitored and an image is displayed by the display unit when calculating the remaining amount of the battery, a correction value is set based on the display color of the displayed image. A portable electronic device, wherein the remaining amount of the battery is specified using at least the correction value and a value indicating the state of the battery, and the specified remaining amount is displayed on the display unit. The display unit
A plurality of light emitting elements constitute one pixel, a color is generated for each pixel by adjusting a light amount for each of the plurality of light emitting elements, and a screen display is performed by an aggregate of the pixels. The portable electronic device according to claim 1. The plurality of light emitting elements are composed of light emitting elements of three primary colors R, G, and B,
The controller is
A single light emission state for each of the R, G, and B light emitting elements is extracted with reference to a part of a drawing signal that instructs the display unit to draw an image, and a light emission ratio is determined based on the extracted single light emission state. The portable electronic device according to claim 1, wherein the correction value is calculated and set. The controller is
By comparing at least a value indicating the state of the battery and a value calculated based on the correction value with a preset threshold value, a remaining battery level is determined, and the remaining battery level is indicated by a pictogram. It displays on a display part. The portable electronic device of any one of Claim 1 to 3 characterized by the above-mentioned.

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