KR101544441B1 - Electronic paper display device capable of efficient battery managing - Google Patents

Electronic paper display device capable of efficient battery managing Download PDF

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Publication number
KR101544441B1
KR101544441B1 KR1020140026959A KR20140026959A KR101544441B1 KR 101544441 B1 KR101544441 B1 KR 101544441B1 KR 1020140026959 A KR1020140026959 A KR 1020140026959A KR 20140026959 A KR20140026959 A KR 20140026959A KR 101544441 B1 KR101544441 B1 KR 101544441B1
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South Korea
Prior art keywords
power
battery
main processor
mode
amount
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KR1020140026959A
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Korean (ko)
Inventor
마병인
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(주)미디어에버
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Priority to KR1020140026959A priority Critical patent/KR101544441B1/en
Priority to PCT/KR2015/001819 priority patent/WO2015133758A1/en
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Publication of KR101544441B1 publication Critical patent/KR101544441B1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/14—Electronic books and readers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Sources (AREA)

Abstract

An e-paper display device capable of efficient battery management is disclosed. The display device comprising: an electronic paper module for updating the transmitted image on the electronic paper; a module driving driver for transmitting the image to the electronic paper module in response to the transmitted image update signal; A main processor for generating a signal and transmitting the generated signal to the module driving driver, counting the image update period in the power saving mode, and booting to boot into the standby mode, and a battery power source for supplying power to the module driver and the main processor Wherein the main processor estimates a battery remaining amount of the battery power unit by subtracting a total amount of power consumption of the ePaper display unit from a battery capacity of the battery power unit measured at the time of reset of the ePaper display apparatus .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic paper display device,

An embodiment according to the concept of the present invention relates to an electronic paper display (EPD), and more particularly to an electronic paper display (EPD) capable of measuring the battery capacity in the e-paper display device with minimal power consumption, The present invention relates to an e-paper display apparatus capable of automatically making a battery alarm even in a state in which it is maintained.

Electronic paper is a display technology using common ink characteristics and is also called E-paper. The display device (EPD) using such an electronic paper is a display device made to be used like a real paper feel, and unlike a conventional flat display using a back light so that a pixel is shined, . Accordingly, the display device using the electronic paper has a relatively low power consumption as compared with a device using a backlight power source such as an LCD device, and thus is widely used for a portable electronic book such as an e-book reader. Recently, It is also used as a memorial park image device for the same purpose. EPD as an image device for memorial park has to be guaranteed for a long period of use of at least one year without any special attention or management action of the manager. In order to find out the remaining battery capacity of the EPD device, The battery capacity value was measured. In general, the existing EPD uses an ADC (Analog Digital Converter) to measure the battery capacity value. However, since the ADC consumes a lot of power, it consumes unnecessary power to measure the battery capacity. When the standby state is long, it is necessary to switch to the power saving mode to minimize the power consumption. If the power saving state continues for a long time while the battery is almost exhausted, the remaining amount of battery is consumed during the power saving mode, There was a problem that the alarm could not be performed.

The technical problem to be solved by the present invention is to provide an e-paper display device capable of estimating the capacity of a battery in an electronic paper display (EPD) device with minimal power consumption, thereby enabling efficient battery management.

Another technical problem to be solved by the present invention is to provide an e-paper display device capable of automatically performing battery alarm even when the power saving mode is maintained, thereby enabling efficient battery management.

An e-paper display device capable of efficient battery management according to the above-described object of the present invention includes an electronic paper module for updating an image transferred to an electronic paper, and an electronic paper module for transferring the image to the electronic paper module A main processor for generating the image update signal according to the image update period in the idle mode with the module driver, transmitting the image update signal to the module driver, counting the image update period in the power saving mode and booting the idle mode, A module driver, and a battery for supplying power to the main processor.

At this time, the main processor can estimate the battery remaining amount of the battery power unit by subtracting the total power consumption amount of the ePaper display unit from the battery capacity of the battery power unit measured at the time of reset of the ePaper display apparatus.

Also, the main processor may switch from the standby mode to the power saving mode when the power consumption of the standby mode according to the image update period is greater than the power consumed during booting.

The reset means the initial mounting or replacement of the battery in the battery power unit. The total amount of power consumed is determined based on the amount of power consumed during booting, the amount of power consumed in updating the image, the amount of power consumed in the standby mode, Mode, which is calculated by summing up the amount of power consumed in the mode.

According to an embodiment, when the main processor is in the power save mode, the main processor compares a value obtained by subtracting an amount of power consumed until the image is updated from the estimated battery remaining amount with a reference value, Is booted to be in the standby mode if it is below the reference value, and can transmit a battery replacement alarm to the module driving driver.

According to an embodiment, when the main processor is in the standby mode, the main processor compares a value obtained by subtracting the amount of power consumed until the image is updated from the estimated remaining battery power, and a reference value, The battery replacement alarm can be transmitted to the module driving driver while the standby mode is maintained.

In this case, the reference value is a capacity corresponding to the self-discharge voltage of the battery.

According to an embodiment, when the main processor is in the power saving mode, the main processor boots and switches to the standby mode when the estimated battery remaining amount corresponds to a predetermined ratio of the measured battery capacity at the time of reset, The battery capacity of the power section can be measured directly.

As described above, the e-paper display device capable of efficiently managing the battery according to the embodiment of the present invention significantly reduces the use of the ADC (Analog Digital Converter) and estimates the battery capacity in the e-paper display device with only minimal power consumption There is an effect that can be.

In addition, the e-paper display device capable of efficient battery management according to an embodiment of the present invention can automatically alarm a battery even if the power saving mode is maintained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to more fully understand the drawings recited in the detailed description of the present invention, a detailed description of each drawing is provided.
1 is an internal block diagram of an e-paper display device according to an embodiment of the present invention.
FIG. 2 is a timing chart for explaining a method of switching the mode of the main processor shown in FIG. 1 to minimize power consumption.
3 is a timing chart for explaining a method of estimating the battery capacity of the battery power unit of the main processor shown in FIG.
4 is a timing chart for explaining a method of performing a battery replacement alarm according to a battery capacity estimated or measured by the main processor shown in FIG.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are only for the purpose of illustrating embodiments of the inventive concept, But may be embodied in many different forms and is not limited to the embodiments set forth herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are intended to distinguish one element from another, for example, without departing from the scope of the invention in accordance with the concepts of the present invention, the first element may be termed the second element, The second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms "comprises" or "having", etc. are intended to specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings.

1 is an internal block diagram of an e-paper display device (hereinafter referred to as 'display device') capable of efficient battery management according to an embodiment of the present invention.

Referring to FIG. 1, a display device 100 includes an electronic paper module 200, a module driving driver 300, a main processor 400, and a battery power unit 500.

The electronic paper module 200 includes an electronic paper (E-paper) having a structure in which a conductive electrode layer, an electronic ink layer, and a transparent insulating layer are sequentially stacked or a conductive electrode layer and an electronic ink layer are sequentially stacked, Img_1 to img_n) transmitted in a predetermined image update period (? T) from the imaging device (300) on the electronic paper (E-paper) sequentially.

The module driving driver 300 transmits a plurality of images img_1 to img_n to the electronic paper module 200 according to an update signal up_img transmitted from the main processor 400, and a first memory MEM1 capable of storing the image data img_n.

The main processor 400 generates an update signal up_img according to a predetermined period Δt and transmits the update signal up_img to the module driving driver 300. The main processor 400 generates a time table for the period Δt, Img_n), the amount of power consumed during boot, the amount of power consumed when updating each of the plurality of images (img_1 to img_n), the amount of power consumed per unit time in the standby mode, the amount of power consumed per unit time And a second memory MEM2 capable of storing power information such as a power amount.

The main processor 400 may switch its mode from a standby mode (idle_mode) to a power saving mode (sleep_mode) in order to minimize the power consumption of the display device 100, (Or measure) the battery capacity of the battery.

Further, the main processor 400 may change its mode to generate a battery alarm based on the battery capacity of the battery power unit 500 measured.

Hereinafter, a method of switching the mode of the main processor 400 in order to minimize the power consumption of the display device 100 will be described with reference to FIG.

2 is a timing diagram for explaining how the main processor 400 shown in FIG. 1 switches modes to minimize power consumption.

2 (a) shows an example of maintaining the idle mode (idle_mode), and FIG. 2 (b) shows an example of switching to a power saving mode (sleep_mode).

1 and 2, the amount of power consumed at the time of booting the display apparatus 100 is P_1, and the module driving driver 300 receives the image (img_1) according to the update signal (up_img) transmitted from the main processor 400 The amount of power consumed in updating the electronic paper module 200 is P_2, the amount of power consumed in the standby mode (idle_mode) of the display device 100 after the booting is P_3, and the amount of power consumed in the power saving mode (sleep_mode) is P_4.

After the update of the first image (img_1), the main processor 400 calculates the amount of power P_3 to be consumed in the idle mode (idle_mode) of the display device 100 for a predetermined time [Delta] t for updating the second image (img_2) (Id_mode) if the power consumption P_3 is smaller than the threshold value th_val and the sleep_mode when the power consumption P_3 is greater than the threshold th_val.

For example, in FIG. 2A, since the amount of power P_3 consumed in the idle mode of the display device 100 for a predetermined time period Δt is smaller than the threshold value th_val, the main processor 400 Maintains idle mode (idle_mode).

In contrast, in FIG. 2B, since the amount of power P_3 consumed in the idle mode of the display device 100 is greater than the threshold value th_val during the predetermined time period Δt, (Sleep_mode). ≪ / RTI >

According to an embodiment, the threshold value th_val may be set to a power amount P_2 consumed at the time of booting the display device 100, wherein sleep_mode is at least equal to a minimum value Consumes only the amount of power P_4.

2B, the main processor 400 counts the update period? T so as to return to the standby mode? T just before the update period? T elapses, when the mode is switched to the power save mode (sleep_mode) mode_normal), and transmits an update signal (up_img) to the module driver 300.

Accordingly, when the main processor 400 determines that the amount of power P_3 consumed in the idle mode of the display device 100 during the update period? T is greater than the threshold value th_val, the main processor 400 sets the sleep mode So that only the minimum amount of power (P_4) can be consumed.

3, the main processor 400 estimates or measures the battery capacity of the battery power unit 500 using only minimal power consumption. In the description of FIG. 3, the main processor 400 determines the battery capacity of the battery power unit 500 Will be described.

3 is a timing chart for explaining a method of estimating the battery capacity of the battery power unit 500 by the main processor 400 shown in FIG.

1 to 3, the display device 100 is booted after a reset, and the module driving driver 300 drives the electronic paper module 200 (200) according to the update signal (up_img) To update the first image (img_1).

Thereafter, the main processor 400 updates the second image img_2 according to the first update time? Ta while maintaining the idle mode (idle_mode), and updates the second image img_2 according to the second update time? img_3), and switches to the power saving mode (sleep_mode) after updating the third image (img_3). Thereafter, it boots to update the fourth image img_4 just before the third update time? Tc elapses.

At this time, the amount of power consumed in resetting the display device 100 is P_0 (for example, p01), the amount of boot power consumed in booting is P_1 (for example, p11 and p12), and the images img_1 to img_4, 200) is P_2 (e.g., p21, p22, p23, and p24).

The amount of power consumed in the idle mode (idle_mode) is P_3 (for example, p31 and p32) and the amount of power consumed in the power saving mode (sleep_mode) is P_4 (for example, (E.g., p41).

The amount of power P_3 consumed in the idle mode (idle_mode) is a value obtained by multiplying the unit power consumed per unit time of the idle mode (idle_mode) by predetermined update periods (? Ta,? Tb and? Tc, respectively) Is a value obtained by multiplying a unit power amount consumed per unit time of the power save mode (sleep_mode) by predetermined update periods (? Ta,? Tb, and? Tc, respectively).

The reset includes resetting the battery to the initial state in which the battery is first installed or replaced (for example, a primary battery that has never been used, a primary battery that has been used, or a secondary battery that can be charged) to the battery power source unit 500 of the display device 100 , Or a process of initializing the display device 100 such as a user pressing a reset button.

The power P_0 consumed during the reset operation may be a power amount consumed by the main processor 400 for measuring the capacity of the battery when the battery is mounted (or replaced) or when the display device 100 is initialized .

At this time, the main processor 400 may measure the battery capacity of the battery power unit 500 using a system on a chip (SoC) using an ADC (Analog Digital Converter) (not shown).

The main processor 400 sequentially accumulates the amount of power P_1 consumed when the display device 100 is booted and the amount of power P_2 consumed when updating the images img_1 to img_4, The total amount of power consumption P_total of the display device 100 is calculated by cumulatively adding the amount of power P_3 consumed when idle mode is idle_mode and the amount of power P_4 consumed when sleep_mode is consumed.

Then, the main processor 400 may estimate the residual battery power of the battery power unit 500 by subtracting the estimated total power consumption P_total from the measured battery capacity during the reset.

For example, in FIG. 3, the measured battery capacity at the time of resetting the display device 100 is Bat_mAH, the amount of power P_0 for measuring the battery capacity is p01, the amount of power P_1 consumed when the main processor 400 boots, Is the sum of the first boot power p11 and the second boot power p12 and the amount of power consumed when updating the images img_1 to img_4 is the sum of the first image update power amount p21 and the second image update power amount p22 ), The third image update power amount p23, and the fourth image update power amount p24.

The power consumption P_3 consumed in the standby mode idle_mode of the main processor 400 is the sum of the first zone standby power p31 and the second zone standby power p32, the amount of power P_4 consumed in sleep_mode is the first section power saving amount p41.

Therefore, the main processor 400 sets the total amount of power consumption P_total of the display device 100 as the total sum of the amounts of power consumption (p01 + p11 + p12 + p21 + p22 + p23 + p24 + p31 + p32 + p41) .

Subsequently, the main processor 400 subtracts the calculated total power consumption P_total from the battery capacity Bat_mAH when the battery capacity of the battery power unit 500 measured during the reset is Bat_mAH, (Est_mAH = Bat_mAH - P_total) of the battery.

Therefore, the main processor 400 according to the embodiment of the present invention does not measure the battery remaining amount (Est_mAH) by using the ADC every boot time like the conventional main processor, (Est_mAH) can be continuously estimated with minimum power consumption without actual measurement by calculating the total power consumption (P_total) based on the unit power amount at the time of the standby mode (idle_mode) or the power saving mode (sleep_mode).

The main processor 400 can store the estimated battery remaining amount value Est_mAH in the second memory MEM2 and transmit the estimated battery remaining amount Est_mAH according to the setting to the electronic paper module 200 for display have.

On the other hand, when the operating time of the display device 100 is prolonged, an accumulated error of the total power consumption P_total estimated by the main processor 400 may occur, so that the main processor 400 calculates the remaining battery power It is possible to directly measure the battery capacity of the battery power unit 500 at a time when Est_mAH is determined to be a predetermined amount or after a predetermined time has elapsed since the reset.

According to an embodiment, the predetermined amount may be set to a battery capacity corresponding to a specific ratio such as 50% or 25% of the battery capacity Bat_mAH measured at the time of reset, Or every three months or more.

On the other hand, if it is determined that the sleep mode of the main processor 400 is long or the remaining battery power is consumed for another reason in a state where the battery capacity of the battery power unit 500 is almost exhausted, It is necessary to inform the user of the battery replacement in advance.

At this time, when the main processor 400 of the display device 100 is in the idle mode, the main processor 400 is activated, so that it is not a big problem to alert the user to the battery replacement. However, If the sleep mode is maintained for a long time, the main processor 400 is in a sleep state, so that the user can not be warned of battery replacement.

Accordingly, the main processor 400 according to an embodiment of the present invention can detect a battery replacement alarm regardless of a sleep mode or a standby mode (idle_mode) based on the estimated or measured battery capacity of the battery power unit 500 can do.

Hereinafter, a method of performing the battery replacement alarm according to the battery capacity estimated or measured by the main processor 400 will be described in detail with reference to FIG.

4 is a timing chart for explaining a method of performing a battery replacement alarm according to the battery capacity estimated or measured by the main processor 400 shown in FIG.

4 (a) is an exemplary diagram for explaining a battery replacement alarm when the main processor 400 is in the power save mode (sleep_mode), and FIG. 4 (b) ), The battery replacement alarm is described.

Referring to FIGS. 1 to 4A, the main processor 400 maintains a sleep mode (sleep_mode) after updating the first image (img_1), and then immediately before the update period? T elapses (I.e., switch from sleep mode to standby mode) and update the second image (img_2) (indicated by the dotted line).

At this time, the main processor 400 estimates (or measures) the battery capacity Est_mAH after the first image update (img_1) as described with reference to FIG. 3 and recognizes the battery capacity Est_mAH of the power information stored in the second memory MEM2 The power amount P_4 consumed in the power saving mode (sleep_mode), the power amount P_1 consumed in booting, and the update power amount P_2 of the second image img_2 are also known.

The main processor 400 determines whether the value obtained by subtracting the power consumption P_4 + P_1 + P_2 consumed until the second image img_2 is updated from the estimated (or measured) battery capacity Est_mAH is smaller than the reference value ref_val (I.e., switching from sleep_mode to idle_mode), and transmits a battery replacement alarm to the module drive driver 300 or the electronic paper module 200. [

The reference value ref_val may be set to a value at which the capacity of the battery is exhausted or may be set to a value considering a self-discharge voltage of the battery. In general, the self-discharge voltage of a commercialized primary cell is known to be about 2% of the initial voltage.

For example, when the estimated (or measured) battery remaining amount (Est_mAH) is 10, the amount of power P_4 consumed in the power saving mode (sleep_mode) is 9 and the amount of power P_1 consumed in booting is 1 2 image (img_2) update power amount P_2 is equal to 1, the main processor 400 determines that -1, which is a value obtained by subtracting the consumed power amount 11 from the estimated remaining battery power 10, is less than or equal to a reference value (for example, 0) It immediately boots to switch from sleep mode (idle_mode) to idle mode (idle_mode) and sends a battery replacement alarm signal to module drive driver 300.

4A shows an example in which the main processor 400 switches from a sleep mode to a standby mode to idle mode for battery replacement alarm. However, this boot and mode switching is performed only for the battery replacement alarm It is needless to say that the present invention can be applied to the direct measurement of the battery capacity of the battery power source unit 500 described with reference to FIG.

For example, when the main processor 400 is in the sleep mode, if it is determined that the estimated battery capacity Est_mAH is 50% of the battery capacity Bat_mAH measured at the time of reset, (idle_mode), and directly measure the battery capacity of the battery power source unit 500. [0050]

1 to 3 and 4 (b), the main processor 400 maintains the idle mode (idle_mode) after the update of the first image (img_1) and the second image (img_2) And tries to switch to the sleep mode (indicated by a dotted line) until the third image (img_3) is updated after the update.

At this time, the main processor 400 estimates (or measures) the battery capacity Est_mAH after the first image update (img_1) and is aware of the battery capacity (Est_mAH) The amount of power P_3 consumed in the first image (img_2), the amount of update power P_2 of the second image img_2, and the amount of power P_4 consumed in the power saving mode (sleep_mode).

Accordingly, the main processor 400 subtracts the amount of power P_3 + P_2 + P4 consumed in the series of processes from the estimated (or measured) battery capacity Est_mAH until the third image img_3 is updated The battery replacement alarm is transmitted to the module driving driver 300 or the electronic paper module 200 while the standby mode (idle_mode) is maintained when it is determined that one value is equal to or smaller than the reference value ref_val.

For example, when the estimated (or measured) battery remaining amount Est_mAH is 10, the amount of power P_3 consumed in the idle mode idle_mode is 7 and the amount of update power P_2 of the second image img_2 is 1, and the amount of power P4 to be consumed in the power saving mode (sleep_mode) is 3.

At this time, since the value obtained by subtracting the consumed power amount 11 from the estimated remaining battery level 10 is equal to or less than the reference value (for example, 0), the main processor 400 maintains the standby mode state (idle_mode) Immediately after (or immediately before) updating the image (img_2), a battery replacement alarm signal may be transmitted to the module drive driver (300).

After the update of the second image (img_2), the main processor 400 can turn off the power of the display device 100 by using the characteristic of the e-paper that the image is kept even if the power is turned off.

Alternatively, the main processor may switch from a standby mode (idle_mode) to a power saving mode (sleep_mode), and then the user can recognize the battery replacement alarm displayed on the electronic paper module 200 even if the remaining battery power is exhausted.

Therefore, the display device 100 according to the embodiment of the present invention has the effect of enabling the user to make a battery replacement alarm regardless of the mode (idle_mode or sleep_mode) of the main processor 400.

Referring again to FIG. 1, the battery power unit 500 included in the display device 100 plays a role of supplying power to the main processor 400 and the module driver 300 so that the main processor 400 and the module driver 300 can operate.

The display device 100 may further include a user interface 450 capable of receiving a user's input signal for booting or mode conversion of the main processor 400, May be implemented as a remote control receiver capable of receiving a remote radio signal.

As a result, the e-paper display device 100 capable of efficient battery management according to an exemplary embodiment of the present invention can significantly reduce the use of the ADC, thereby estimating and estimating the battery capacity in the e-paper display device 100 with minimal power consumption. There is an effect that can be measured, and the battery alarm can be performed automatically even if the sleep mode is maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: display device
200: Electronic paper module
300: Module-Driven Driver
400: main processor
450: User Interface
500: Battery power

Claims (8)

In an electronic paper display device,
An electronic paper module for updating the transferred image on the electronic paper;
A module driver for transmitting the image to the electronic paper module in response to a transmitted image update signal;
In a standby mode for updating the image, the image update signal is generated and transmitted to the module driving driver according to a sequentially increasing image update period, and in a power saving mode in which only power for counting the image update period is consumed, A main processor for counting update cycles and switching to the standby mode; And
And a battery power supply unit including the module drive driver and a battery for supplying power to the main processor,
Wherein the main processor switches from the standby mode to the power saving mode when the power consumption of the standby mode according to the image update period is greater than the power consumed in switching from the power saving mode to the standby mode, Estimating a remaining battery level of the battery power source unit by subtracting a total amount of power consumption of the e-paper display device from a battery capacity of the battery power source unit measured at the time of resetting the device,
Wherein the reset means first mounting or replacing the battery of the battery power source unit. delete delete The method according to claim 1,
Wherein the control unit calculates a sum of the amount of power consumed in switching from the power saving mode to the standby mode, the amount of power consumed in updating the image, the amount of power consumed in the standby mode, and the amount of power consumed in the power saving mode. The method according to claim 1, wherein, when the main processor is in the power saving mode,
Wherein the main processor compares a value obtained by subtracting an amount of power consumed until the image is updated from the estimated battery remaining amount with a reference value and switches to the standby mode when the subtracted value is less than the reference value, To the module drive driver. The method according to claim 1, wherein when the main processor is in the standby mode,
Wherein the main processor compares a value obtained by subtracting an amount of power consumed until the image is updated from the estimated battery remaining amount with a reference value, and if the subtracted value is equal to or less than the reference value, To the module drive driver. The e-paper display device according to claim 5 or 6, wherein the reference value is a capacity corresponding to a self-discharge voltage of the battery. The method according to claim 1, wherein, when the main processor is in the power saving mode,
Wherein the main processor switches to the standby mode when the estimated battery remaining amount corresponds to a predetermined ratio of the battery capacity measured during the reset and directly measures the battery capacity of the battery power unit.
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