JP4553645B2 - recoding media - Google Patents

Description

  The present invention relates to a recording medium that forms an image display system together with electronic paper including a paper-like display or rewritable paper, and stores image data of an image to be displayed on the electronic paper.

In recent years, many image display systems (electronic paper systems) using electronic paper, also called paper-like display or rewritable paper, have been proposed as display means for displaying images (see, for example, Patent Document 1). Electronic paper combines the characteristics of paper with excellent portability and visibility and the characteristics of a display that can rewrite display content repeatedly, and is a flexible thin display that displays image information written from an external device. Means.
JP 2002-244620 A

  However, in the conventional electronic paper system, when image data of an image to be displayed on the electronic paper is supplied to the electronic paper, the image information is written on the electronic paper using a personal computer or a dedicated large writing device. However, image data can be supplied to electronic paper only at a predetermined place where a personal computer or a dedicated large writing device is installed.

  An object of the present invention is to provide a recording medium that can supply image data of an image to be displayed on the electronic paper to the electronic paper while handling the electronic paper like paper at an arbitrary place.

  The recording medium of the present invention is configured as follows to solve the above-described problems.

(1) A recording medium that constitutes an image display system together with a sheet-like electronic paper that has a display unit in a range excluding at least a part of a peripheral portion and displays an image based on input image data on the display unit. A main body, a gripping body rotatably attached to the main body, and a first end portion of the main body and a second end portion of the gripping body which are engaged with a part of a peripheral portion of the electronic paper. An engagement portion, wherein the first end portion and the second end portion are configured to be detachable from each other, and the first end portion and the second end portion are in contact with each other. A spring for biasing the image, input means for receiving input of image data from an external device , a first memory for storing image data input to the input means, and an image data stored in the first memory A second memory for storing display conditions; and the first memo And transmitting means for storing image data transmitted to the electronic paper, the detection means for detecting each other's disjunctive state between the first end and the second end portion of the engaging portion, said detecting means Control means for controlling transmission of the image data by the transmission means based on the detection result of the image and the display condition.

  In this configuration, the image data input from the external device to the recording medium and stored in the first memory of the recording medium is for engaging the engaging portion of the recording medium with a part of the peripheral portion of the sheet member. When the operation is performed and the display condition permits, it is transmitted from the recording medium to the electronic paper. When the electronic paper receives the image data transmitted from the recording medium, the electronic paper displays an image based on the received image data on the display unit.

  Therefore, when an operation for engaging the engaging portion of the recording medium with a part of the peripheral portion of the electronic paper is performed, if the display condition permits, the image data recorded in advance on the recording medium is recorded. The image based on the transmitted image data is displayed on the display unit of the electronic paper. Even if an operation for engaging the engaging portion of the recording medium with a part of the peripheral portion of the electronic paper is performed, if the display condition is not allowed, the image data recorded in advance on the recording medium is read from the recording medium. Not sent to electronic paper.

  (2) The second memory stores a display condition for each image data.

  In this configuration, even when a plurality of image data is stored in the first memory, the display conditions for each image data are stored in the second memory.

  (3) The display condition is a permitted number of transmissions of the image data to the electronic paper, and a counting unit that counts the number of times the image data stored in the first memory is transmitted by the transmission unit. Further, the control means transmits the image data by the transmission means only when the number of times counted by the counting means is less than the permitted number of times.

  In this configuration, the permitted number of transmissions of image data to electronic paper is preset as a display condition. Further, the number of times each image data is transmitted to the electronic paper is counted by the counting means, and the image data is transmitted to the electronic paper only when the number of times the image data is transmitted to the electronic paper is less than the permitted number. If the number is more than the number, the image data is not transmitted to the electronic paper.

  (4) The display condition is a period during which the image data is allowed to be transmitted to the electronic paper, and further includes a clock unit that acquires a current time, and the control unit determines whether the current time acquired by the clock unit is The image data is transmitted by the transmission means only when it is within the permission period.

  In this configuration, a permission period for transmission of image data to electronic paper is set in advance as a display condition. Further, the current time at the time when the image data is transmitted to the electronic paper is acquired by the clock means. Then, the current time is compared with the permission period, and only when the current time is within the permission period, the image data is transmitted to the electronic paper. When the current time is outside the permission period, the image data is not transmitted to the electronic paper.

  According to the present invention, the following effects can be obtained.

  (1) By performing an operation for engaging the engaging portion of the recording medium with a part of the peripheral portion of the electronic paper, the image data recorded in advance on the recording medium is recorded only when the display condition permits. The image can be transmitted from the medium to the electronic paper, and an image based on the transmitted image data can be displayed on the display unit of the electronic paper. Accordingly, image data of an image to be displayed by the electronic paper can be supplied to the electronic paper while the electronic paper is handled like paper at an arbitrary place. In addition, since the image data is transmitted from the recording medium to the electronic paper only when the display condition permits, the confidentiality of the image data stored in the recording medium can be improved.

  (2) Since display conditions for each image data are stored in the second memory, transmission of image data can be controlled based on display conditions that differ for each image data.

  (3) By limiting the number of times that transmission of image data to electronic paper is permitted, the confidentiality of the image data can be enhanced.

  (4) By limiting the period during which transmission of image data to electronic paper is permitted, the confidentiality of the image data can be improved.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of electronic paper constituting an image display system together with a recording medium according to an embodiment of the present invention. The electronic paper 1 is a rectangular sheet having flexibility, and a display screen (which is a display unit of the present invention) 12 is formed in a portion excluding the peripheral portion 11. The display screen 12 is configured by any of a twisting ball display, an electrophoretic display, an electrolytic deposition / dissolution type display, an organic EL display, or the like. The peripheral edge 11 is formed with a predetermined width over the entire circumference of the electronic paper 1, but it is sufficient if it is formed at least at a part of the circumference of the electronic paper 1. This peripheral portion 11 is provided with an antenna 13 included in the receiving means of the present invention.

  FIG. 2 is a diagram showing a memory clip which is a recording medium constituting the image display system. 2A is a front view of the memory clip, and FIGS. 2B and 2C are side sectional views of the X1-X2 portion and the Y1-Y2 portion in FIG. 2A, respectively. The memory clip 2 includes a main body 21 and a grip body 22. A recess 21 b is formed on the back surface of the main body 21, and a stopper 22 b projects from the front surface of the gripping body 22. The front end of the stopper 22b is fitted in the recess 21b. The shaft support portions 21a and 22a protrude from above the recess 21b and the stopper 22b on the back surface of the main body 21 and the front surface of the grip body 22, respectively, and the main body 21 and the grip body 22 are mutually connected by the pins 23 that pass through the shaft support portions 21a and 22a. It is made rotatable.

  Contact points constituting the switch 29 are provided at positions facing each other at the lower end portion of the back surface of the main body 21 and the lower end portion of the front surface of the gripping body 22. The switch 29 is detection means of the present invention, and detects the open / closed state of the lower end of the main body 21 and the lower end of the gripping body 22. An antenna 30 is disposed below the stopper 22b on the front surface of the gripping body 22. The antenna 30 is included in the transmission means of the present invention.

  A torsion spring 24 is externally fitted to the pin 23, and an elastic force acts in a direction away from both ends of the torsion spring 24 on the back surface of the main body 21 and the upper surface of the front surface of the gripping body 22. Yes. As a result, the lower end portions of the back surface of the main body 21 and the front surface of the gripping body 22 are urged in a direction in which they are in contact with each other in a state where no external force is applied to the memory clip 2. From this state, when the upper part of the front surface of the main body 21 and the upper part of the rear surface of the gripping body 22 are pressed in the direction approaching each other against the elastic force of the torsion spring 24 by the fingers, the lower end of the rear surface of the main body 21 And the lower end of the front surface of the gripping body 22 are separated from each other, and this state is detected by the switch 29.

  In other words, the switch 29 detects that the memory clip 2 has been operated in the same manner (operation during use) as when the sheet body is gripped by a normal paper clip. As an example, when the memory clip 2 is operated in use and the lower end portion on the back surface of the main body 21 and the lower end portion on the front surface of the gripping body 22 are separated from each other, the switch 29 outputs an ON signal. The lower end portion on the back surface of the main body 21 and the lower end portion on the front surface of the gripping body 22 correspond to the engaging portion of the present invention. Further, the above-described operation in use is an operation on the engaging portion of the present invention.

  A display unit 25 and a selection key 26 are provided on the front surface of the main body 21. The selection key 26 includes up / down / left / right cursor keys and a confirmation key, and accepts an operation of selecting image data to be transmitted to the electronic paper 1. When the memory clip 2 stores a plurality of image data, the memory clip 2 transmits the image data selected by the selection key 26 to the electronic paper 1. The number of the image data selected by the selection key 26 is displayed on the display unit 25.

  Further, a connection terminal 27 protrudes from one side surface of the main body 21. The connection terminal 27 is constituted by a USB connector as an example, and is included in the input means of the present invention. A control unit corresponding to the control means of the present invention is built in the main body 21, and the display 25, the selection key 26, the connection terminal 27, and the switch 29 are electrically connected to the control unit. The control unit of the main body 21 is electrically connected to the antenna 30 of the gripping body 22 via the flexible substrate 28.

  FIG. 3 is a block diagram showing a configuration of the image display system. The image display system 10 includes the electronic paper 1 and the memory clip 2 as described above. The electronic paper 1 includes a CPU 41 to which a memory 42, an interface circuit 43, and a display control circuit 44 are connected. The interface circuit 43 constitutes the receiving means of the present invention together with the antenna 13 and receives the image data transmitted from the memory clip 2 via the antenna 13. The memory 42 stores image data received by the interface circuit 43. The CPU 41 reads the image data stored in the memory 42, creates display data based on the image data, and outputs it to the display control circuit 44. The display control circuit 44 displays the image of the image data transmitted from the memory clip 2 on the display screen 12 based on the display data input from the CPU 41. Power is supplied from the power supply circuit 45 to the CPU 41 and the display control circuit 44.

  The memory clip 2 includes a CPU 51 to which a memory 52, a ROM 57, a display control circuit 53, interface circuits 54 and 55, a selection key 26, and a switch 29 are connected. The interface circuit 54 constitutes the input means of the present invention together with the USB connector 27 and receives image data input from an external device via the USB connector 27. The external device is a device that can process image data, such as a personal computer, a personal digital assistant, a PDA, a digital camera, or a facsimile device. The memory clip 2 receives at least input of image data while being connected to an external device through the USB connector 27. Note that the interface circuit 54 may output image data stored in the memory clip 2 to an external device.

  The memory 52 corresponds to the first memory of the present invention and stores the image data input from the interface circuit 54. Further, in the memory 52, a memory area 52a for storing display conditions for each image data and a number-of-times storage area 52b for storing the number of times image data stored in the memory 52 has been transmitted through the interface circuit 55 are provided. It is done. The display conditions input together with the image data are stored in the memory area 52a. The memory area 52a corresponds to the second memory of the present invention. The CPU 51 for counting the number of times image data stored in the memory 52 has been transmitted via the interface circuit 55 and the number storage area 52b for storing the counted number correspond to the counting means of the present invention. The memory area 52a corresponding to the first memory and the number storage area 52b included in the counting means may be provided separately from the memory 52 corresponding to the first memory.

  The CPU 51 counts the number of image data files stored in the memory 52 and displays the counted number of files on the display unit 25 via the display control circuit 53. The CPU 51 can display the number of files on the display unit 25 when the operation key 26 is operated. When the user operates the operation key 26, the user can confirm whether or not the image data is stored in the memory clip 2 based on whether or not the number of files is displayed on the display unit 25. Further, the display of the display unit 25 is terminated when a predetermined time has passed without the electronic paper 1 being gripped between the main body 21 and the gripping body 22 of the memory clip 2 to reduce power consumption. May be.

  The interface circuit 55 is transmission means of the present invention and transmits image data via the antenna 30. When the switch 29 detects the open state of the lower end portion of the main body 21 and the lower end portion of the gripping body 22, or the switch 29 has gripped the electronic paper 1 between the main body 21 and the gripping body 22. Is detected, the image data of the file number corresponding to the numerical value displayed on the display 26 is transmitted from the antenna 30 via the interface circuit 55.

  The CPU 51, the display control circuit 53, and the interface circuit 55 are supplied with power from a power supply circuit 56 having a battery.

  Further, the memory clip 2 includes means for acquiring a time including the current date.

  With the above configuration, the image display system 10 temporarily stores image data of an image to be displayed on the display screen 12 of the electronic paper 1 from the external device in the memory clip 2 and then transmits the image data from the memory clip 2 to the electronic paper 1. The electronic paper 1 and the memory clip 2 have a known electromagnetic coupling type RFID (Radio Frequency Identification) system. The electronic paper 1 has an IC tag function, and the memory clip 2 has a reader / writer function. ing.

  The memory clip 2 transmits and receives data between the interface circuit 55 and the interface circuit 43 of the electronic paper 1, selects a specific electronic paper 1, and transmits image data. Accordingly, even when a plurality of electronic papers 1 are close to each other, image data is transmitted from the memory clip 2 to a predetermined specific paper 1.

  FIG. 4 is a flowchart showing a procedure for transmitting image data in the image display system. FIG. 4A shows a processing procedure in a memory clip, and FIG. 4B shows a processing procedure in electronic paper. The CPU 51 of the memory clip 2 waits for the switch 29 to detect an operation in use for the memory clip 2 (S1), and transmits a preparation signal from the interface circuit 55 when the switch 29 outputs an ON signal (S2). . This preparation signal is a signal for notifying start of data transmission from the reader / writer to the IC tag in the RFID system described above. This preparation signal is a power carrier wave having a frequency assigned in advance to the specific electronic paper 1 to which the memory clip 2 corresponds.

  When the corresponding electronic paper 1 is located in the vicinity of the memory clip 2 that has transmitted the preparation signal, the preparation signal is received by the antenna 13 of the electronic paper 1. The received preparation signal is energized through a coil connected to the antenna 13, and a current flows through a rectifier connected to the coil. When a current of a predetermined value or more flows through the rectifier, a voltage of a certain value or more is generated in the power supply circuit 45, and the CPU 41 of the electronic paper 1 is activated.

  The CPU 41 of the electronic paper 1 transmits an allowance signal at the same time as being activated (S11). This permission signal is a signal for notifying the reader / writer of the data receivable state from the IC tag in the RFID system described above.

  The CPU 51 of the memory clip 2 waits for an allowable signal to be transmitted within a predetermined time after transmitting the preparation signal (S3, S4). When the allowable signal transmitted from the electronic paper 1 is received, the memory 52 The image data stored therein is transmitted through the interface circuit 55 (S3 → S5).

  When receiving the image data transmitted from the memory clip 2 via the interface circuit 43 (S12), the CPU 41 of the electronic paper 1 sequentially stores the received image data in the memory 42 (S13) and completes the storage of the image data. Then, a write completion signal is transmitted (S14). Thereafter, the CPU 41 creates display data based on the image data in the memory 42 (S15), and displays an image based on the created display data on the display screen 12 (S16).

  Note that the CPU 51 of the memory clip 2 transmits the attribute data together with the image data. The attribute data is information indicating the size of the image, information such as fonts, colors, ruled lines and file names related to the text image, information indicating the type of application software at the time of image creation, and information indicating the compression method. is there.

  By the above processing, the memory clip 2 stores the memory paper 2 by gripping a part of the peripheral edge 12 of the electronic paper 1 with the memory clip 2 in the same manner as the operation of gripping a part of the peripheral edge of the paper with the normal paper clip. An image can be displayed on the display screen 12 of the electronic paper 1 based on the image data being processed.

  In this embodiment, since the antenna 13 is arranged over the entire circumference of the peripheral edge 12 of the electronic paper 1, the memory clip 2 can be held by any position on the peripheral edge 12 of the electronic paper 1 by the memory clip 2. The image can be displayed on the display screen 12 of the electronic paper 1 based on the image data stored in.

  However, normally, in the case of horizontal writing images, the upper left part or the center of the left side of the paper is gripped by the paper clip, and in the case of vertical writing images, the upper right part or the center of the right side of the paper is gripped by the paper clip. In consideration of the above, the antenna 13 may be disposed at least at the position shown in FIG. In this case, for example, an external view of the memory clip 2 is illustrated at the position where the antenna 13 is disposed at the peripheral edge 12 of the electronic paper 1 so that the position to be gripped by the memory clip 2 can be recognized. It may be. From this figure, it can also be recognized that the electronic paper 1 can use the memory clip 2.

  Further, if the antenna 13 is present at a position where the preparation signal transmitted from the memory clip 2 can be received, it is only necessary to perform an operation when using the memory clip 2 at that position. A part of the peripheral edge 12 of the paper 1 does not need to be gripped.

  Further, when the image data is individually transmitted from the memory clip 2 to each of the plurality of electronic papers 1 as in the case where the plurality of stacked electronic papers 1 are held by the memory clip 2, 1 is set in advance, and communication between the memory clip 2 and the electronic paper 1 is performed in the following procedure.

  First, single authentication data is transmitted from the memory clip 2 together with a preparation signal. The electronic paper 1 activated by receiving the preparation signal transmits an allowable signal including its own authentication data to the memory clip 2 only when the received authentication data matches its own authentication data. The memory clip 2 transmits image data corresponding to the authentication data included in the received permission signal together with the authentication data. The electronic paper 1 displays an image based on the received image data only when the authentication data attached to the received image data matches its own authentication data.

  In addition, the power supply unit 45 of the electronic paper 1 includes not only a power carrier wave from the memory clip 2 but also an original sheet battery, a solar cell, or a power supply provided in the memory clip 2 Power can also be supplied by providing a contact that joins the contact.

  FIG. 6 is a flowchart showing details of image data transmission processing of a memory clip in the image display system. FIG. 7 is a diagram showing an example of display conditions for image data stored in the memory area 52a. In this embodiment, as the display condition of the image data Di, the permitted number Pi for permitting the display of each image data Di is set for each image data Di and stored in the memory area 52a. The number of times each image data stored in the memory 52 is transmitted to the electronic paper 1 via the interface circuit 55 (display count Mi) is counted by the CPU 51 and stored in the count storage area 52b.

  The CPU 51 creates a list of image data stored in the memory 52, and transmits the created list of image data to the electronic paper 1 via the interface circuit 55 (S21). When the CPU 51 receives the writing completion signal transmitted from the electronic paper 1 (S22), it waits for the selection of an image by operating the selection key 26 (S23). As shown in FIG. 7, the CPU 51 stores the cumulative display count Mi of each image data Di so far in association with each image data Di in the count storage area 52b in the memory 52, and the display count Mi Determines whether or not the number of allowed display times Pi set for the image data Di selected by the operation of the selection key 26 is exceeded (S24). If not, the image selected by the operation of the selection key 26 is determined. Data Di is transmitted (S25). When the CPU 51 receives the write completion signal transmitted by the electronic paper 1 for the transmitted image data (S26), it adds “1” to the variable Mi and returns to the process of S21. If the CPU 51 determines in S24 that the display count Mi has already reached the permitted number Pi, the CPU 51 transmits information for displaying that “the image data Di cannot be displayed because the permitted number of times has already been displayed” ( When a write completion signal transmitted from the electronic paper 1 is received (S28), the process returns to S21.

  Through the processing described above, a list of image data stored in the memory clip 2 is displayed on the display screen 12 of the electronic paper 1. The user refers to a list of image data displayed on the electronic paper 1 and selects one image to be displayed on the electronic paper 1 by operating the selection key 26 of the memory clip 2. When the image data of the image desired by the user is selected by the operation of the selection key 26, if the selected image data has not been displayed for the permitted number of times, the image data is transmitted to the electronic paper 1. The image is displayed on the display screen 12 of the electronic paper 1. If the selected image data has already been displayed the permitted number of times, information indicating that the image based on the image data cannot be displayed is transmitted to the electronic paper 1 and displayed on the display screen 12 of the electronic paper 1. Is done.

  Therefore, each image data is not transmitted and displayed on the electronic paper 1 beyond the permitted number of times Pi set for each image data, and the image to be displayed on the electronic paper 1 while handling the electronic paper 1 like paper. The confidentiality of each data can be increased.

  FIG. 8 is a flowchart showing details of image data transmission processing of a memory clip according to another embodiment. FIG. 9 is a diagram showing another example of display conditions for image data stored in the memory area 52a.

  In this embodiment, the memory clip 2 includes a clock 58 for acquiring the current time. The clock 58 corresponds to the clock means of the present invention. Further, as display conditions for the image data Di, a permission start time limit Si and a permission end time limit Ti for permitting display of each image data Di are set for each image data Di and stored in the memory area 52a. The CPU 51 acquires the current time N indicating the date from the clock 58, compares the current time N with the permission start time limit Si and the permission end time limit Ti (S31), and the current time N is the permission start time limit Si and the permission end time. It is determined whether there is image data within the range of the time limit Ti, that is, image data that can be displayed (S32). If there is image data that can be displayed, a list of the image data is sent via the interface circuit 55. To the electronic paper 1 (S33). When the CPU 51 receives the write completion signal transmitted by the electronic paper 1 (S34), it waits for the selection of an image by operating the selection key 26 (S35). The CPU 51 transmits the image data Di selected by operating the selection key 26 (S36). When the CPU 51 receives the write completion signal transmitted from the electronic paper 1 for the transmitted image data (S37), the process returns to S31.

  If the CPU 51 determines in S32 that there is no image data that can be displayed, the CPU 51 transmits information indicating that “there is no image data that can be displayed” (S38), and the writing that the electronic paper 1 has transmitted. When the completion signal is received (S29), the process returns to S31.

  Through the processing described above, a list of image data that satisfies a preset display condition is displayed on the display screen 12 of the electronic paper 1. The user refers to a list of image data displayed on the electronic paper 1 and selects one image to be displayed on the electronic paper 1 by operating the selection key 26 of the memory clip 2. When image data of an image desired by the user is selected by operating the selection key 26, the image data is transmitted to the electronic paper 1, and an image based on the transmitted image data is displayed on the display screen 12 of the electronic paper 1. Is done. If there is no image data that satisfies the display condition, information indicating that there is no image data that can be displayed is transmitted to the electronic paper 1 and displayed on the display screen 12 of the electronic paper 1.

  Therefore, each image data is not transmitted to and displayed on the electronic paper 1 outside the period set for each image data, and accordingly, an image to be displayed on the electronic paper 1 while handling the electronic paper 1 like paper. The confidentiality of each data can be increased.

It is a top view of the electronic paper which comprises an image display system with the recording medium which concerns on embodiment of this invention. It is a figure which shows the memory clip which is a recording medium which comprises the said image display system, (A) is a front view of a memory clip, FIG.2 (B) and (C) are X1- in FIG.2 (A), respectively. It is side surface sectional drawing of X2 part and Y1-Y2 part. It is a block diagram which shows the structure of the said image display system. It is a flowchart which shows the transmission procedure of the image data in the said image display system, (A) shows the processing procedure in a memory clip, (B) shows the processing procedure in an electronic paper. It is a top view which shows another example of the electronic paper applied to the said image display system. It is a flowchart which shows the detail of the image data transmission process of a memory clip in the said image display system. It is a figure which shows an example of display conditions. It is a flowchart which shows the detail of the image data transmission process of the memory clip which concerns on other embodiment. It is a figure which shows another example of display conditions.

Explanation of symbols

1 Electronic paper 2 Memory clip (recording medium)
3 Image processing device (external device)
11 Display screen (display section)
12 peripheral part 13 antenna (receiving means)
21 Main body 22 Grasping body 27 USB terminal (input means)
29 switch (detection means)
30 Antenna (Transmission means)
41 CPU (image display means)
43 Interface circuit (receiving means)
44 Display control circuit (image display means)
51 CPU (control means)
52 memory (first memory)
52a Memory area (second memory)
52b Count storage area (counting means)
54 Interface circuit (input means)
55 Interface circuit (transmission means)
58 clock (clock means)

Claims (4)

A recording medium that constitutes an image display system together with a sheet-like electronic paper that has a display unit in a range excluding at least a part of a peripheral part and displays an image based on input image data on the display unit,
The body,
A gripping body rotatably attached to the main body;
An engaging portion comprising a first end portion of the main body and a second end portion of the gripper, which is engaged with a part of a peripheral edge portion of the electronic paper , the first end portion and the second end portion Engaging portions configured to be separable from each other ;
A spring that biases the first end and the second end in a direction in which they abut against each other;
Input means for receiving image data input from an external device;
A first memory for storing image data input to the input means;
A second memory for storing display conditions of image data stored in the first memory;
Transmitting means for transmitting image data stored in the first memory to the electronic paper;
Detecting means for detecting a state of separation and contact between the first end portion and the second end portion of the engaging portion ;
And a control unit that controls transmission of image data by the transmission unit based on a detection result of the detection unit and the display condition.   The recording medium according to claim 1, wherein the second memory stores display conditions for each image data. The display condition is a permitted number of transmissions of the image data to the electronic paper,
A counter for counting the number of times the image data stored in the first memory is transmitted by the transmitter;
3. The recording medium according to claim 1, wherein the control unit transmits the image data by the transmission unit only when the number of times counted by the counting unit is less than the permitted number of times. 4. The display condition is a permission period for transmission of the image data to the electronic paper,
A clock means for obtaining the current time;
The recording medium according to claim 1, wherein the control unit transmits the image data by the transmission unit only when the current time acquired by the clock unit is within the permission period.

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