JP2014191499A - Display device, power consumption control method and power consumption control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and a power consumption control method capable of performing handwriting input to the last page by solving inconvenience in which power in a power supply unit runs out in the middle of a page as a large number of notes by hand are written in.SOLUTION: Before or after the next page with no handwriting input is displayed on display means 11 by switching of pages, an allocation value of a power consumption amount for handwriting which is allocated to the page is calculated, and also, before or after the next page with no handwriting input is displayed on the display means 11, based on the power consumption amount which is already consumed according to the handwriting amount of each page, an estimation value of the power consumption amount is acquired according to the handwriting amount for the next page. Then, whether or not the acquired estimation value for the next page has surpassed the allocation value is determined, and when it is determined that it has surpassed, suppression control of the power consumption amount is performed.

Description

  The present invention relates to a display device such as electronic paper or a tablet terminal, a power consumption control method and a power consumption control program implemented in the display device.

  As a display device that displays data such as documents, it is possible to maintain the display state without consuming the power of the built-in power supply, and the user can write notes on the display screen by handwriting, such as electronic paper A tablet terminal or the like is used.

  However, in such a display device, power is consumed when the display data is rewritten, so that power is consumed every time a displayed page is switched or a memo is written. In particular, during a meeting or presentation, the question content may be written down on the document for later questions, but if the power of the power supply unit of the display device is cut off, It becomes inconvenient because it becomes impossible to write.

  In addition, there is a display device that displays a message prompting charging before power is exhausted, but the same problem occurs when charging cannot be performed immediately.

  One of the causes of this problem is that electronic paper is recognized as a low power consumption medium, so even if the remaining power is low, the user writes a large amount of notes without being aware of the remaining power. Therefore, it is conceivable that the power consumption increases.

  In Patent Document 1, a data processing device that communicates wirelessly with an image processing device and is driven by a battery, and the processing is performed by the image processing device when the remaining amount of the battery is less than a predetermined remaining amount. There is disclosed a data processing apparatus that controls to transmit image data that may be transmitted to the image processing apparatus.

JP 2011-59750 A

  However, in the technique of Patent Document 1, although the predetermined process is performed when the remaining amount of the battery is less than the predetermined remaining capacity, this is not a process that assumes that the power of the power supply unit is exhausted halfway. For this reason, there is a possibility that power is lost and the processing is interrupted.

  For this reason, depending on the technique described in Patent Document 1, a large amount of handwritten memos are written, and the power of the power supply unit is lost on the page in the middle, so that the memo writing cannot be performed thereafter. I couldn't.

  The present invention has been made in view of such a technical background, and eliminates the disadvantage that a large amount of handwritten memos are written and the power of the power supply unit is lost on a halfway page, leading to the final page. It is an object of the present invention to provide a display device and a power consumption control method capable of performing handwriting input, and further to provide a power consumption control program for causing a computer of the display device to execute the power consumption control method.

The above problem is solved by the following means.
(1) The display state of the data of any page in the power supply unit and document data composed of a plurality of pages is held without consuming the power of the power supply means, and is displayed while consuming the power of the power supply unit. Display means for switching pages, handwriting input means for consuming power of the power supply unit and inputting and displaying data handwritten on the screen of the display means by a user, and displayed on the display means For each page of the document data, when the handwritten data is input and displayed by the handwriting input means, the measuring means for measuring the consumed electric energy according to the amount of handwriting, and the next handwriting by switching the page Before or after a non-input page is displayed on the display means, an assigned value of the power consumption for handwriting assigned to the page is displayed. Calculating means to be output, and before or after the next handwritten uninput page is displayed on the display means, the amount of consumed power corresponding to the handwritten amount of each page measured by the measuring means Based on the measurement value, an estimated value acquisition unit that acquires an estimated value of power consumption corresponding to the handwritten amount for the next page, and a handwritten amount for the next page acquired by the estimated value acquisition unit A determination unit that determines whether or not an estimated value of the corresponding power consumption exceeds an allocation value of the power consumption for handwriting for the page calculated by the calculation unit; A display device comprising: control means for performing suppression control of power consumption when it is determined that the allocated value is exceeded.
(2) The preceding item, wherein the estimated value acquisition unit acquires, as the estimated value, one of an average value, a median value, and a mode value of the consumed electric energy measured by the measuring unit for each handwritten page The display device according to 1.
(3) The calculation means calculates the difference between the allocation value of the power consumption for handwriting for the previous page of the next page and the consumed power amount of the previous page measured by the measurement means, Allocation of power consumption for handwriting for the next page by obtaining the quotient by dividing by the number of remaining unwritten handwritten pages in the document data and adding this quotient to the allocated value for the previous page 3. The display device according to item 1 or 2 described above.
(4) The display device according to any one of the preceding items 1 to 3, wherein the power consumption suppression control is control for reducing the resolution of handwritten data and displaying the reduced data on the display means.
(5) The display device according to any one of the preceding items 1 to 3, wherein the suppression control of the power consumption is a control for reducing a screen update frequency when handwritten data is displayed on the display means.
(6) When handwritten data is displayed in color on the display device, the power consumption suppression control is control for displaying the handwritten data in monochrome on the display means. 4. The display device according to any one of 3.
(7) The display device according to any one of Items 1 to 6, wherein when the control unit performs the suppression control of the power consumption, the display unit displays an inquiry as to whether the suppression control is permitted or not.
(8) The control unit causes the display unit to display a display for allowing the user to recognize the range of the handwritten amount from which the suppression control of the power consumption is canceled in a state where the suppression control of the power consumption is performed. The display device according to any one of 1 to 7 above.
(9) The control unit causes the display unit to display a display for allowing the user to recognize the range of the handwritten amount where the power consumption suppression control is started in a state where the power consumption suppression control is not performed. The display device according to any one of 1 to 7 above.
(10) The display state of the data of any page in the power supply unit and document data composed of a plurality of pages is held without consuming the power of the power supply means, and is displayed while consuming the power of the power supply unit. A display device comprising: display means for switching a page to be displayed; and handwriting input means for consuming and displaying data handwritten on the screen of the display means by consuming power of the power supply unit In the power consumption control method to be implemented, for each page of the document data displayed on the display means, when the handwritten data is input and displayed by the handwriting input means, consumption corresponding to the amount of handwriting A measurement step for measuring the amount of power consumed, and before or after the next unwritten handwritten page is displayed on the display means by switching pages. In the measurement step, after calculating the allocation value of the power consumption for handwriting allocated to the page later, or before or after the next page without handwriting input is displayed on the display means An estimated value acquisition step of acquiring an estimated value of the power consumption amount corresponding to the handwritten amount for the next page based on the measured power consumption amount corresponding to the handwritten amount of each page, and the estimated value acquiring step It is determined whether the estimated value of the power consumption corresponding to the handwritten amount for the next page acquired in step exceeds the allocated value of the power consumption for handwriting for the page calculated in the calculating step And determining the power consumption when it is determined in the determining step that the estimated value exceeds the allocated value. Power control method characterized by comprising: a control step for controlling, the.
(11) The display state of the data of any page in the power supply unit and document data composed of a plurality of pages is held without consuming the power of the power supply means, and is displayed while consuming the power of the power supply unit. A display device comprising: a display means for switching pages to be switched; and a handwriting input means for consuming and displaying data handwritten on the screen of the display means by consuming power of the power supply unit. A measurement step of measuring a consumed power amount corresponding to a handwritten amount when data handwritten by the handwritten input unit is input and displayed on each page of the document data displayed on the display unit on the computer Then, before or after the next page without handwriting input is displayed on the display means by switching the page, the page is assigned to the page. A calculation step of calculating an assigned value of the power consumption for handwriting to be applied; and each page measured in the measurement step before or after the next handwritten non-input page is displayed on the display means An estimated value acquisition step of acquiring an estimated value of the power consumption amount according to the handwritten amount for the next page based on the consumed power amount according to the handwritten amount of the first and the estimated value acquired in the estimated value acquiring step A determination step of determining whether an estimated value of power consumption corresponding to a handwritten amount for a next page exceeds an allocated value of the power consumption amount for handwriting for the page calculated in the calculating step; When it is determined in the determining step that the estimated value is greater than the allocated value, a control step for performing power consumption suppression control. Power control program for executing the flop, the.

  According to the invention described in the preceding paragraph (1), the power consumption for handwriting allocated to the page before or after the next page without handwriting input is displayed on the display means by switching the page. An allocated value is calculated, and the next unwritten handwritten page is displayed before or after being displayed on the display means, based on the consumed power amount corresponding to the handwritten amount of each page. An estimated value of power consumption corresponding to the amount of handwriting for the page is acquired. Then, it is determined whether or not the estimated value for the acquired next page exceeds the allocated value, and when it is determined that the estimated value has exceeded, control for suppressing power consumption is performed.

  That is, when the amount of handwriting increases, the estimated value also increases. Therefore, the estimated value exceeds the allocated value of the power consumption for handwriting, and the power consumption for the page is suppressed. And since such a process is repeated for each page that is not input by handwriting, it is possible to avoid a situation where a large amount of handwritten notes are written and the power of the power supply means is lost on the page in the middle. The possibility of handwritten input can be ensured up to the page.

  According to the invention described in the preceding item (2), it is possible to easily obtain, as an estimated value, an average value, a median value, or a mode value of consumed electric energy corresponding to the handwritten amount of each handwritten page. Can do.

  According to the invention described in the preceding item (3), the difference between the allocated value of the power consumption for handwriting for the previous page of the next page and the measured power consumption of the previous page is calculated as follows. By dividing the number of remaining unwritten handwritten pages in the document data to obtain a quotient, and adding this quotient to the assigned value for the page, the assigned value of the power consumption for handwriting for the next page By doing so, the allocation value of the power consumption for handwriting about the next page can be calculated | required easily.

  According to the invention described in item (4), the power consumption can be suppressed by reducing the resolution of the handwritten data and displaying it on the display means.

  According to the invention described in the preceding item (5), the power consumption can be suppressed by reducing the frequency of screen update when handwritten data is displayed on the display means.

  According to the invention described in item (6), the power consumption can be suppressed by displaying the handwritten data in monochrome on the display means.

  According to the invention described in the preceding item (7), when the suppression control of the power consumption is performed, the inquiry about whether or not the suppression control is performed is displayed on the display unit. Suppression control can be performed.

  According to the invention described in item (8) above, the user can recognize the range of the handwritten amount from which the suppression control of the power consumption is canceled in a state where the suppression control of the power consumption is performed.

  According to the invention described in item (9), the user can recognize the range of the handwritten amount where the suppression control of the power consumption is started in a state where the suppression control of the power consumption is not performed.

  According to the invention described in the preceding item (10), when the amount of handwriting increases, the amount of power consumption is suppressed, so that a large amount of handwritten memos are written and the power of the power supply means is lost on the intermediate page. Can be avoided, and the possibility of handwriting input can be secured up to the final page without handwriting input.

  According to the invention described in the preceding item (11), when the amount of handwriting increases, the process of suppressing the power consumption can be executed by the computer of the display device.

It is a front view of the electronic paper as a display apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the electrical structure of electronic paper. It is a flowchart which shows the suppression process of the power consumption with respect to the handwritten input performed in electronic paper. FIG. 4 is a flowchart illustrating a subroutine of a process for calculating an assigned value of a power amount for handwriting to be assigned to the first page of document data to be displayed on electronic paper, shown in step S <b> 1 of FIG. 3. It is a figure for demonstrating the allocation value calculation process of the power consumption amount for handwriting amount with respect to the following page shown by step S15 of FIG. It is a flowchart which shows the subroutine of the allocation value calculation process of the power consumption amount for handwriting amount with respect to the following page shown by step S15 of FIG. It is a figure of the state by which the indicator which shows how much remaining power consumption is left and the suppression control of power consumption is not performed after the next page is displayed on the screen. It is a figure of the state currently displayed on the screen which shows how much remaining amount of power consumption is left and the suppression control of power consumption is cancelled | released after the next page. It is a figure for demonstrating the state from which the suppression control of power consumption is cancelled | released on the next page. Even if handwriting is not performed on the current page, when the power consumption suppression control is not released on the next page, an example of displaying on the screen which power consumption suppression control is released on which page is shown. FIG. It is a flowchart which shows the subroutine of an indicator display process shown by step S12 of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view of an electronic paper 1 as a display device according to an embodiment of the present invention. Note that the display device is not limited to electronic paper, and may be a tablet terminal or the like.

  The electronic paper 1 includes a display unit 11, and a page return button 12, an execution / update button 13, and a page feed button 14 are disposed at the lower end.

  The display unit 11 has a known configuration in which the display state of the document data is maintained without consuming the power of the power supply unit, which will be described later, and the power is consumed when the display page is switched. “Without power consumption” is a concept that allows not only power consumption but also power consumption to be small.

  A touch panel (not shown) is provided on the surface of the display unit 11, and the user can input a memo such as a character or a figure by handwriting into the document data by tracing the touch panel with the handwriting input device 2 such as a handwriting pen. It can be configured. Moreover, the display of the memo etc. input by handwriting with the handwriting input device 2 is performed with power consumption similarly to page switching.

  The page return button 12 is a button for switching the displayed page to the previous page, and the execution / update button 13 executes selection of any document data from a plurality of document data, for example. The page feed button 14 is used to determine the user's intention for the inquiry about the permission of the control displayed on the display unit 11 when the power consumption control is performed. This button is used to switch to the next page.

  FIG. 2 is a block diagram illustrating an electrical configuration of the electronic paper 1.

  In addition to the display unit 11 described above, the electronic paper 1 includes a CPU 101, a RAM 102, a ROM 103, an image processing unit 104, an external storage device 105, an operation unit 106, a power management unit 107, a power unit 108, a network interface (in the drawing, a network IF and 109).

  The CPU 101 performs overall control of the entire electronic paper 1 by loading a program stored in the ROM 103 or the external storage device 105 into the RAM 103 and executing the program. For example, based on a user operation, an arbitrary page of any document data among a plurality of document data stored in the external storage device 105 is displayed on the display unit 11, the display page is switched, or the screen is changed. When handwriting by the handwriting input device 2 is performed, control is performed such as capturing, inputting, and displaying.

  Furthermore, in this embodiment, when the data handwritten by the handwriting input device 2 is input and displayed for each page of the document data displayed on the display unit 11, the consumed electric energy corresponding to the handwritten amount is measured. Before or after the next unwritten handwritten page is displayed on the display unit 11 by page switching, or after calculating the handwritten power consumption allocated value assigned to the page, Before or after a page that has not been handwritten is displayed on the display unit 11, the handwritten amount for the next page is calculated based on the consumed power amount corresponding to the measured handwritten amount of each page. Obtain an estimated value of the corresponding power consumption. Further, it is determined whether or not the acquired estimated value exceeds the calculated allocated value for the page, and when it is determined that the estimated value exceeds the allocated value, control for suppressing power consumption is performed. The details are described later.

  The RAM 102 is a storage medium that provides a work area when the CPU 101 operates in accordance with the operation program, and the ROM 103 is a storage medium that stores an operation program executed by the CPU 101 and other data.

  The image processing unit 104 performs predetermined image processing on image data and the like stored in the external storage device 105.

  The external storage device 105 is composed of a portable recording medium such as an SD card, for example, and stores a plurality of document data composed of one page or a plurality of pages displayed on the display unit 11.

  The operation unit 106 includes the touch panel described above, and reads the coordinates of the touch position when the touch panel is touched.

  The power management unit 107 manages the state of the power supply unit 108, and is configured as a part of the function of the CPU 101 in this embodiment. The power supply unit 108 supplies power to each unit of the electronic paper 1 and is configured to be rechargeable. In addition, when the page displayed on the display unit 11 is switched or the memo is written on the screen by the handwriting input device 2, the power of the power supply unit 108 is consumed, and the power management unit 107 consumes the consumed energy. Is subtracted from the amount of power that can be used.

  The network interface 109 functions as a communication unit that transmits and receives data between the electronic paper 1 and another external device via a network.

  Next, a power consumption suppression process for handwritten input executed in the electronic paper 1 will be described with reference to the flowchart of FIG.

  Note that the processing shown in the flowchart of FIG. 3 is executed by the CPU 101 operating according to an operation program recorded on a recording medium such as the ROM 103.

  In step S <b> 1, an allocation value of the power amount for handwriting allocated to the first display page of the document data displayed on the electronic paper 1 is calculated. This process is shown in FIG.

  In FIG. 4, in step S <b> 101, the power consumption amount (total remaining power consumption amount for handwriting) Pa that can be allocated for handwriting among the current power remaining amount of the power supply unit 108 is calculated. The total remaining amount Pa may be obtained, for example, by measuring the current power remaining amount of the power supply unit 108 and subtracting the power consumption required for switching each page from the measured power remaining amount.

  Next, in step S102, the number of pages that have not yet been handwritten in the document data is calculated, and in step S103, the total remaining amount Pa is divided by the number of pages that have not been handwritten to obtain the assigned value for the first page. .

  For example, when the total number of pages of document data is N and the page is not yet handwritten, when the first page is displayed first, the allocated amount for this page is calculated as Pa / N.

  Note that the allocated amount for the subsequent pages is calculated in step S15 described later.

  Returning to FIG. 3, an estimated value is acquired in step S2. This estimated value is an estimated value of power consumption corresponding to the amount of handwriting that is expected to be used when handwritten input is performed on a page that is not input by handwriting displayed on the display unit 11.

  In this embodiment, any one of an average value, a median value, and a mode value of the consumed power amount corresponding to the handwritten amount measured on each page that has been handwritten in the document data displayed on the display unit 11 is an estimated value. Used as These are all representative values of consumed power corresponding to the amount of handwriting on each page that has been handwritten, and are suitable as estimated values of power consumption for pages to be handwritten. Hereinafter, the estimated value is also referred to as a representative value. Which of the average value, the median value, and the mode value is used is set in advance by the user or the like. The average value is a value obtained by dividing the total measured power consumption according to the amount of handwriting on each page by the number of pages handwritten, and the median is the power consumed according to the amount of handwriting on each page. This is the median value when the measured quantities are arranged in descending or ascending order. When there are an even number of measured values, the sum of the two central values is divided by two. The mode value is the value that appears most frequently among the measured values.

  Note that the measurement value of the consumed electric energy according to the handwritten amount is recorded in the external storage device 105 or the like for each page, and when the representative value is calculated, the stored measurement value is loaded and calculated.

  Next, in step S3, it is determined whether or not the acquired representative value exceeds the assigned value of the power consumption for handwriting assigned to the page. If it exceeds (YES in step S3), an inquiry screen as to whether or not the power consumption suppression control may be performed is displayed on the display unit 411 in step S6, and whether or not the user has permitted in step S7. Investigate. If not permitted (NO in step S7), the process proceeds to step S9 without performing the power consumption suppression control. If permitted (YES in step S7), in step S8, the resolution reduction process is set as the power consumption suppression control, and then the process proceeds to step S9. The resolution reduction process is a process for reducing the resolution of handwritten data and displaying it on the display unit 11.

  Thus, since the inquiry screen as to whether or not the power consumption suppression control may be performed is displayed on the display unit 11, the user's intention can be confirmed and the power consumption suppression control can be performed.

  If the representative value does not exceed the assigned value in step S3 (NO in step S3), it is determined in step S4 whether the resolution reduction process is being executed. If it is being executed (YES in step S4), step After canceling the resolution reduction process in S5, the process proceeds to step S9. If the resolution reduction process is not being executed in step S4 (NO in step S4), the process directly proceeds to step S9.

  In step S9, it is determined whether or not handwriting by the handwriting input device 2 has been performed. If not (NO in step S9), the process proceeds to step S13. If yes (YES in step S9), handwriting input processing is executed in step S10. That is, the handwritten data is captured and displayed on the display unit 11. In this case, when the resolution reduction process is set, the handwritten data is displayed on the display unit 11 with the resolution reduced. Next, in step S11, after measuring the consumed electric energy accompanying handwriting, the process proceeds to step S12.

  In step S12, an indicator display process is executed. In this process, the display for making the user recognize the range of the handwritten amount for which the suppression control of the power consumption is released and the suppression control of the power consumption are performed in the state where the suppression control of the power consumption is performed. This is a process of causing the display unit 11 to display a display for allowing the user to recognize the range of the handwritten amount for which the suppression control of the power consumption is started in the absence of the power consumption. Details will be described later.

  Next, in step S13, it is determined whether or not the user has instructed page switching. If not instructed (NO in step S13), the process returns to step S9. When page switching is instructed (YES in step S13), in step S14, it is checked whether the currently displayed page is the last page. If it is the last page (YES in step S14), the process is terminated. If it is not the last page (NO in step S14), in step S15, an allocation value of the power consumption amount for handwriting with respect to the page not yet input by handwriting displayed on the display unit 11 is calculated. This process will be described later.

  Next, in step S16, the page switching process is executed, and then the process returns to step S2.

  The allocation value calculation process of the power consumption amount for handwriting with respect to the next page in step S15 will be described with reference to FIG.

  Assume that the total number of pages of the document data is N, the page currently displayed on the display unit 11 is C page, the next page displayed is C + 1 page, and the next page displayed is C + 2 page. In addition, all pages are not handwritten at first, and are displayed on the display unit 11 in order from the first page. Further, if the assigned value of the power consumption amount for handwriting assigned to the currently displayed C page is Pc, and the consumed power amount corresponding to the handwritten amount measured when handwriting is performed is pWc, the C page (Pc-pWc) is remaining.

  When this remaining power is divided by the number of remaining handwritten uninput pages (N−C), it is possible to allocate a surplus power amount of Pc1 = (Pc−pWc) / (N−C) per page.

  Then, this Pc1 is added to the allocation value pc for the C page to obtain an allocation value P (c + 1) of the power consumption for handwriting for the C + 1 page.

  This P (c + 1) is compared with the representative value for page C + 1 in step S3 in the flowchart of FIG. In FIG. 5, the representative value for page C + 1 is displayed as W (c + 1). In the example of FIG. 5, since W (c + 1) <P (c + 1), the power consumption suppression control is not executed.

  Next, it is assumed that handwritten input is made on page C + 1 and a consumed power amount pW (c + 1) larger than the assigned value P (c + 1) is generated according to the handwritten amount. Therefore, an insufficient power amount of (pW (c + 1) −P (c + 1)) is generated for the C + 1 page.

  Dividing this insufficient power amount by the number of remaining handwritten uninput pages (NC-1), Pc1 = (pW (c + 1) -P (c + 1)) / (NC-1) per page Of insufficient power.

  Then, this Pc1 is subtracted (-Pc1 is added) from the assigned value P (c + 1) for the C + 1 page to obtain the handwritten power consumption assigned value P (c + 2) for the C + 2 page.

  Here, since a large amount of consumed electric power pW (c + 1) accompanying handwriting occurs for page C + 1, the representative value W (c + 2) for page C + 2 exceeds the assigned value P (c + 2) as shown in FIG. If this happens, the power consumption suppression control is executed for the C + 2 page.

  In this way, the difference between the allocated value of the power consumption for handwriting for the previous page and the power consumption of the previous page actually measured is divided by the number of remaining unwritten pages. By calculating the quotient Pc1 and adding this quotient to the allocated value for the previous page, the allocated value of the power consumption for handwriting for the next page is calculated. By doing so, it is possible to calculate the handwritten power consumption allocation value of each page relatively easily.

  FIG. 6 is a flowchart showing the assigned value calculation processing for the next page in step S15 in FIG. 3 described above.

  In step S131, the allocated value Pc of the current page is obtained. In step S132, the consumed power amount pWc corresponding to the handwritten amount used in the current page is obtained. In step S133, the remaining power of this page is obtained by (Pc−pWc). Calculate the amount.

  Next, in step S134, power Pc1 to be allocated to the remaining pages is calculated by dividing the remaining power by the number of remaining pages that are not handwritten. In step S135, (Pc + Pc1) is obtained and assigned to the next page.

  Next, the indicator display process in step S12 in the flowchart of FIG. 3 will be described.

  First, when the assigned value is greater than or equal to the representative value and the suppression control of power consumption is not performed, the range of the handwritten amount where the suppression control is started, in other words, how much remaining power consumption remains. The display unit 11 displays an indicator as to whether or not the power consumption suppression control is performed after the next page.

  Specifically, as shown in FIG. 7, a bar-shaped indicator 200 whose display length decreases from 100% to 0% when the amount of handwriting with respect to the displayed page increases indicates the remaining handwritten remaining amount. In addition to being displayed on the display unit 11, a message “Resolution decreases when 0%” is displayed. Therefore, the user can recognize that when the indicator 200 becomes 0%, the power consumption suppression control is performed, and can perform handwriting so that the indicator 200 does not become 0%.

  FIG. 8 shows the range of the handwritten amount in which the suppression control of the power consumption amount is released after the next page when the representative value exceeds the allocated value and the control control of the power consumption amount is performed, in other words, consumption. An example is shown in which an indicator is displayed on the display unit 11 to indicate how much remaining amount of power is left, and how to suppress the control of power consumption after the next page.

  Specifically, as shown in FIG. 8, it is assumed that a bar-shaped indicator 200 whose display length decreases from 100% to 0% when the amount of handwriting with respect to a displayed page increases indicates a remaining handwritten amount. In addition to being displayed on the display unit 11, for example, a red vertical line mark 201 is displayed between the display of 100% and 0%, and “If the remaining amount exceeds the red line, the resolution will increase after the next page.” Is displayed. Therefore, the user can recognize whether the suppression control of the power consumption amount can be canceled when the handwriting amount is suppressed to the mark 201.

  The range of the handwritten amount for which the suppression control of the power consumption amount is canceled can be obtained as follows.

  That is, when the current display page is the C page and the allocation value of the power consumption for handwriting of the next page C + 1 is P (c + 1) and the representative value for the C + 1 page is W (c + 1),

If so, the power consumption suppression control is canceled on the next page. Assuming that the number of pages of the document data is N and the power consumption amount corresponding to the handwritten amount in the C page is pWc, as shown in FIG. 9, P (c + 1) = Pc + (Pc−pWc) / (N−C). From the above equation (1),

It becomes. Therefore, when this is developed and the power consumption pWc corresponding to the handwritten amount of the C page is set to the following state, the control for suppressing the power consumption is canceled on the next page.

  FIG. 10 shows that when the representative value exceeds the assigned value and the power consumption suppression control is performed, the power consumption suppression control is performed on the next page even if handwriting is not performed on the current page. When not cancelled | released, the example which displays on the display part 11 which power consumption suppression control is cancelled | released is shown.

  Specifically, as shown in FIG. 10, a bar-shaped indicator 200 whose display length decreases from 100% to 0% when the amount of handwritten input for the displayed page increases is displayed on the display unit 11. At the same time, the message “Resolution can be restored after 2 pages if not written to this page” is displayed. Therefore, the user can recognize that the power consumption suppression control can be canceled after two pages unless handwritten. It is assumed that the user does not perform handwriting on the next page. In this case, in a state where the next page is displayed on the display unit 11, for example, a message “Resolution can be restored on the next page without writing on this page” is displayed.

  The number of pages whose resolution can be restored is obtained by (Wc−Pc) / ((Pc−pWc) / (N−C)).

  It should be noted that the indicators and the like described in FIGS. 7, 8, and 10 are preferably displayed on the upper portion, the lower portion, or the corners of the display portion 11 so as not to disturb the display of the page as much as possible.

  FIG. 11 is a flowchart of the indicator display process.

  In step S1201, it is determined whether the resolution is reduced, that is, whether the power consumption is being controlled. If the resolution is not reduced (NO in step S1201), the power consumption for handwriting for the current page is determined in step S1205. The remaining amount of power is calculated from the amount allocation value and the ratio of power consumption by handwriting, and is displayed on the display unit 11 with the indicator 200.

  On the other hand, if the resolution has decreased (YES in step S1201), in step S1202, a value Pc1 obtained by dividing the remaining power level (Pc-pWc) of the current page by the number of pages not handwritten (N-C) is obtained. calculate.

  In step S1203, it is checked whether the value obtained by adding the remaining power of the current page and Pc1 is greater than the representative value. If there are many (YES in step S1203), in step S1204, it is displayed on the screen how much power of the current page is left and the resolution is restored in the next page.

  On the other hand, if the value obtained by adding the remaining power of the current page and Pc1 is not greater than the representative value (NO in step S1203), it is sufficient to add Pc1 to the current remaining power several times in step S1206. If nothing is handwritten as it is after calculating (the result is A), the fact that the resolution is restored after page A is displayed on the screen.

  As described above, in this embodiment, since the representative value increases when the amount of handwriting increases, the representative value exceeds the allocated value of the power consumption for handwriting. By reducing the resolution of the displayed data and displaying the data, a process for suppressing power consumption is executed. And since such a process is repeated for each page in which handwriting is not input, it is possible to avoid a situation in which a large amount of handwritten memos are written and the power of the power supply unit 108 is lost on a page in the middle. The possibility of handwriting input can be ensured up to the final page.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, although the case where the resolution of the handwritten data is reduced as the power consumption suppression control is shown, when the representative value (Wc) exceeds the handwritten power consumption allocation value (Pc), the handwritten power consumption is reduced. By reducing the display frequency of data (the screen update frequency of handwritten data) based on Pc / Wc, the power consumption may be suppressed without affecting the resolution.

  Further, when color display is possible, power consumption may be suppressed by switching handwritten data to monochrome display.

  Further, the representative value is calculated after the page switching, but the representative value for the next page may be calculated before the page switching.

  Moreover, although the allocation value of the power consumption for handwriting with respect to the next page was calculated before page switching, you may perform it after page switching.

1 Electronic paper (display device)
2 Handwriting input device 11 Display unit 101 CPU
102 RAM
103 ROM
105 External Storage Device 106 Operation Unit 107 Power Management Unit 108 Power Supply Unit

Claims (11)

A power supply,
A display that maintains the display state of data of any page in the document data consisting of a plurality of pages without consuming the power of the power supply means, and that switches the displayed page by consuming the power of the power supply unit. Means,
Handwritten input means for consuming power of the power supply unit and inputting and displaying data handwritten on the screen of the display means by a user;
For each page of the document data displayed on the display means, when an input display of the data handwritten by the handwriting input means is made, a measuring means for measuring the consumed electric energy according to the handwritten amount;
A calculation means for calculating an assigned value of the power consumption for handwriting assigned to the page before or after the next non-handwritten page is displayed on the display means by switching pages;
Before or after the next unwritten handwritten page is displayed on the display means, based on the measured value of consumed electric power according to the handwritten amount of each page measured by the measuring means, Estimated value acquisition means for acquiring an estimated value of power consumption according to the amount of handwriting for the next page;
The estimated value of the power consumption according to the handwritten amount for the next page acquired by the estimated value acquiring unit exceeds the allocated value of the power consumption for handwriting for the page calculated by the calculating unit. A judgment means for judging whether or not
Control means for performing suppression control of power consumption when it is determined by the determination means that the estimated value exceeds the allocated value;
A display device comprising:   The estimated value acquisition unit acquires, as the estimated value, any one of an average value, a median value, and a mode value of the consumed electric energy measured by the measurement unit for each handwritten page. The display device described.   The calculation means calculates a difference between the allocated value of the power consumption for handwriting for the previous page of the next page and the consumed power amount of the previous page measured by the measurement means in the document data. Divide by the number of remaining unwritten handwritten pages to find the quotient, and add this quotient to the assigned value for the previous page to obtain the assigned value for the power consumption for handwriting for the next page The display device according to claim 1.   The display device according to claim 1, wherein the power consumption suppression control is control for reducing the resolution of handwritten data and displaying the reduced data on the display unit.   The display apparatus according to claim 1, wherein the power consumption suppression control is control for reducing a screen update frequency when handwritten data is displayed on the display unit.   The control for suppressing the power consumption amount is a control for displaying the handwritten data in monochrome on the display means when handwritten data is displayed in color on the display device. The display apparatus in any one.   The display device according to claim 1, wherein the control unit displays an inquiry as to whether or not to perform the suppression control on the display unit when performing the suppression control of the power consumption amount.   The control means displays on the display means a display for allowing the user to recognize the range of the handwritten amount for which the power consumption suppression control is canceled in a state where the power consumption suppression control is being performed. The display apparatus in any one of -7.   The control means causes the display means to display a display for allowing the user to recognize a range of a handwritten amount where the power consumption suppression control is started in a state where the power consumption suppression control is not performed. The display apparatus in any one of -7. A power supply,
A display that maintains the display state of data of any page in the document data consisting of a plurality of pages without consuming the power of the power supply means, and that switches the displayed page by consuming the power of the power supply unit. Means,
Handwritten input means for consuming power of the power supply unit and inputting and displaying data handwritten on the screen of the display means by a user;
A power consumption control method implemented in a display device comprising:
For each page of the document data displayed on the display means, when an input display of the data handwritten by the handwriting input means is made, a measurement step of measuring the consumed power amount according to the handwritten amount;
A calculation step of calculating an allocation value of power consumption for handwriting allocated to the page before or after the next unwritten handwritten page is displayed on the display means by switching pages;
Before or after the next unwritten handwritten page is displayed on the display means, based on the consumed power amount corresponding to the handwritten amount of each page measured in the measurement step, the next An estimated value acquisition step of acquiring an estimated value of power consumption according to the amount of handwriting about the page;
The estimated power consumption amount corresponding to the handwritten amount for the next page acquired in the estimated value acquiring step exceeds the handwritten power consumption allocation value for the page calculated in the calculating step. A determination step to determine whether or not
A control step of performing a suppression control of power consumption when it is determined that the estimated value exceeds the allocated value in the determining step;
A power consumption control method comprising: A power supply,
A display that maintains the display state of data of any page in the document data consisting of a plurality of pages without consuming the power of the power supply means, and that switches the displayed page by consuming the power of the power supply unit. Means,
Handwritten input means for consuming power of the power supply unit and inputting and displaying data handwritten on the screen of the display means by a user;
In a display device computer equipped with
For each page of the document data displayed on the display means, when an input display of the data handwritten by the handwriting input means is made, a measurement step of measuring the consumed power amount according to the handwritten amount;
A calculation step of calculating an allocation value of power consumption for handwriting allocated to the page before or after the next unwritten handwritten page is displayed on the display means by switching pages;
Before or after the next unwritten handwritten page is displayed on the display means, based on the consumed power amount corresponding to the handwritten amount of each page measured in the measurement step, the next An estimated value acquisition step of acquiring an estimated value of power consumption according to the amount of handwriting about the page;
The estimated power consumption amount corresponding to the handwritten amount for the next page acquired in the estimated value acquiring step exceeds the handwritten power consumption allocation value for the page calculated in the calculating step. A determination step to determine whether or not
A control step of performing a suppression control of power consumption when it is determined that the estimated value exceeds the allocated value in the determining step;
Power consumption control program for executing.

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