JP2012145682A - Data display device, display medium, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately prevent data leakage even if electronic paper as a display medium is detached from a body device and is used.SOLUTION: When detecting that electronic paper 2 is in a state of being detached from a binder section, the data display device erases a display of the whole of or partial data of the data displayed on the electronic paper 2. The data display device indicates that, out of the display data in one page that is displayed in a display region of the electronic paper 2, the data (graphs and tables) in a rectangular range enclosed with alternate long and short dash lines in a figure is the data to be confidential, and, when the electronic paper 2 is detached, the display of the data within the range is erased.

Description

  The present invention relates to a data display device that displays data on electronic paper, a display medium that constitutes electronic paper, and a program.

In general, an electronic paper (display medium) that displays data has a display memory function and can hold a written display for a long time even when the power is turned off. Since it has the merit of being low in power consumption, thin and portable, there is a problem that the display content can be easily read by a copying machine or a scanner.
Therefore, conventionally, a technique has been disclosed in which an electronic paper is provided with a sensor so that the entire image is erased immediately when copying on the copying machine or when the strong light of the copying machine is detected ( Patent Document 1).

JP 2009-244345 A

However, in the above-described prior art electronic paper, the entire data display is erased in order to prevent unauthorized copying. In order to erase the data display by detecting the copying act by the sensor, A circuit, a display control circuit, an overall control circuit, various sensors, and the like are required.
By the way, as described above, the display content of the electronic paper is maintained even when the power is turned off as described above. You can take it out and use it.

  Thus, when the electronic paper is removed from the main unit and used, the display contents of the electronic paper cannot be erased or changed in this removed state. In the meantime, there is a risk that personal data and confidential data will be stolen from behind, and electronic paper may be misplaced, which is a serious problem in terms of security measures.

  An object of the present invention is to appropriately prevent data leakage even when an electronic paper as a display medium is detached from the main body and used.

In order to solve the above-described problem, the invention described in claim 1
A data display device for displaying data on electronic paper as a display medium,
Holding means for detachably holding the electronic paper;
Detecting means for detecting whether the electronic paper is removed from the holding means in a state in which display data is displayed on the electronic paper attached by the holding means;
Display control means for erasing display of at least a portion of the display data displayed on the electronic paper when the detection means detects that the electronic paper is in a state of being removed; and
It is characterized by comprising.

As an invention dependent on claim 1,
The detection means detects that the electronic paper is in a state of being removed when a release operation is performed to instruct the release of the electronic paper holding state prior to the removal of the electronic paper.
The invention according to claim 2, which is configured as described above.

As an invention dependent on claim 1,
The holding means has a connection part for supplying electric power to the electronic paper to be electrically connected, and the connection part has a plurality of terminals including a power supply terminal, and the electronic paper is electrically connected to the electronic paper. The power supply terminal is formed longer in the removal direction of the electronic paper than the signal terminal so that the power supply to the electronic paper is maintained from the start of removal of the electronic paper in the attached state until the removal. And
The detection means detects that the electronic paper is in a state of being removed when the connection between the signal terminal in the connection portion and the electronic paper is released.
The invention according to claim 3, which is configured as described above.

As an invention dependent on any one of claims 1 to 3,
The display control means erases display data within a predetermined range as display target data among display data displayed on the electronic paper.
The invention according to claim 4, which is configured as described above.

As an invention dependent on any one of claims 1 to 3,
Further comprising designation means for arbitrarily designating the data to be concealed from the display data displayed on the electronic paper;
The display control means erases the display of the data to be concealed designated by the designation means among the display data displayed on the electronic paper.
The invention according to claim 5, which is configured as described above.

As an invention dependent on any one of claims 1 to 5,
A non-volatile storage unit built in the electronic paper;
Storage control means for encrypting display data to be erased as the concealment target and storing it in the nonvolatile storage unit,
Further comprising
The invention according to claim 6 is characterized in that it is configured as described above.

As an invention dependent on claim 6,
The storage control means encrypts display data to be erased as a concealment target and stores it in the nonvolatile storage unit in the electronic paper, and stores the encryption or decryption key in the nonvolatile storage unit.
The invention according to claim 7, characterized in that it is configured as described above.

As an invention dependent on any one of claims 1 to 7,
A non-volatile storage unit built in the electronic paper;
The display data to be erased as the object to be concealed is stored in the non-volatile storage unit in the electronic paper, and the erasure indicating which range of data is erased from the display data displayed on the electronic paper Second storage control means for storing a range in the nonvolatile storage unit;
Further comprising
The invention according to claim 8, which is configured as described above.

As an invention dependent on any one of claims 1 to 8,
When the electronic paper removed from the holding means is attached, the display control means redisplays the erased display data on the electronic paper.
The invention according to claim 9, characterized in that it is configured as described above.

As an invention dependent on any one of claims 1 to 9,
A non-volatile storage unit built in the electronic paper;
Third storage control means for storing an identifier for identifying display data to be erased as the concealment target in the nonvolatile storage unit;
Further comprising
The invention according to claim 10, which is configured as described above.

In order to solve the above-described problem, the invention according to claim 11
A display medium constituting electronic paper for displaying data,
A connection portion electrically connected to a data display device that removably holds the electronic paper;
A light control sheet that is attached to the display surface of the electronic paper and controls transmission and shielding of light; and
It is provided with.

As an invention dependent on claim 11,
The light control sheet is a reflective liquid crystal panel sheet.
The invention according to claim 12 may be provided.

As an invention dependent on claim 11,
The light control sheet transmits light when the electronic paper is attached to the data display device and is supplied with power from the data display device, and the electronic paper is removed from the data display device to supply power. Shields light when is blocked
The invention according to claim 13, characterized in that it is configured as described above.

In order to solve the above-mentioned problem, the invention according to claim 14 is
Against the computer,
A function of detecting whether the electronic paper is removed from the holding means in a state where display data is displayed on the electronic paper attached by the holding means for detachably holding the electronic paper as a display medium; ,
A function of erasing display of at least a portion of the display data displayed on the electronic paper when it is detected that the electronic paper is in a state of being removed; and
It is a program for realizing.

  According to the present invention, even if the electronic paper as a display medium is removed from the main device and used, it is possible to appropriately prevent data leakage, and there is no worry of being stolen while carrying or browsing the electronic paper. It is useful for security.

The external view which showed roughly the whole electronic paper apparatus applied as a data display apparatus. 1 is a schematic front view of electronic paper 2. FIG. The figure which illustrated concretely the display data in the display area of electronic paper. The block diagram which showed the basic component of the electronic paper apparatus. The flowchart which showed the operation | movement outline | summary of the electronic paper apparatus started execution with power activation. 6 is a flowchart following the operation of FIG. The figure for demonstrating the electronic paper 2 in 2nd Embodiment. The figure for demonstrating typically the operation state of the electronic paper 2 and the liquid crystal panel sheet 5 in the part which affixed the reflective liquid crystal panel sheet 5 to a part of display surface of the electronic paper 2 in 2nd Embodiment. The flowchart which showed the operation | movement outline | summary of the electronic paper apparatus started execution with power activation in 2nd Embodiment.

(Embodiment 1)
The first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is an external view schematically showing an entire electronic paper device applied as a data display device.
The electronic paper device is a stand-type data display device that is installed in a database center (DB center) for browsing data, for example, and stands upright and thin electronic paper as a whole. This electronic paper device includes a main body device (base unit) 1 and an electronic paper 2 as a display medium. The electronic paper 2 is detachably held in the main body device 1.

  The main unit 1 includes a binder unit 1a that holds an electronic paper (display medium) 2, a stand base 1b that supports the binder unit 1a, a power button 1c, a release button 1d, a display start button 1e, a display switching button 1f, and the like. In addition to the various operation buttons, there are various electronic components (not shown) constituting a power circuit, a display control circuit, an overall control circuit, etc., which will be described later, and further connected to a personal computer (PC) 3 as an external device by cable connection. ing. When the PC 3 acquires display data (various sales data, etc.) stored in the database (DB) 4 from the DB 4 and transfers it to the electronic paper device, the electronic paper device transfers the display data to the electronic paper 2. It is made to display.

  The binder part 1a holds the electronic paper (display medium) 2 in a removable (removable / removable) manner. The binder-type connecting part 1g to which the electronic paper 2 is electrically connected and one end of the electronic paper 2 are provided. It has a sandwiching part 1h. The clamping portion 1h is provided with a lock mechanism (not shown) that locks the electronic paper 2 while holding one end of the electronic paper 2. The electronic paper 2 can be removed even if the electronic paper 2 is pulled in the drawing direction in the locked state. However, when the release button 1d is operated, the locked state is released in response to the operation. The power button 1c is a button for turning on / off the power.

  The release button 1d is operated prior to removing the electronic paper 2 held in the binder unit 1a. The main body device 1 operates when the release button 1d is operated, that is, the electronic paper 2 Is detected to be removed from the binder unit 1a, the display data displayed on the electronic paper 2 is completely or partially erased under predetermined conditions. That is, all or part of the display data displayed on the electronic paper 2 using the time from when the release button 1d is operated before the electronic paper 2 is removed until the electronic paper 2 is actually removed. The display of is deleted. The display start button 1 e is a button for instructing that data should be displayed on the electronic paper 2. The display switching button 1f is a button for instructing to switch to the display data of the next page.

FIG. 2 is a schematic front view of the electronic paper 2.
The electronic paper 2 is a microcapsule type electronic paper utilizing an electrophoretic phenomenon, and although not shown, a large number of media filled with colored charged particles (charged bodies) are arranged between a pair of opposed electrodes. When a voltage is applied between the pair of electrodes, display is performed by moving charged particles in the medium in a direction corresponding to the applied voltage. A plug-in connection portion 2a that is electrically connected to the connection portion 1g on the binder portion 1a side is provided at a central portion of one end portion (left end portion in the figure) of the electronic paper 2. Note that the upper and lower portions of the connecting portion 2a are held regions held by the holding portion 1h on the main device 1 side, and the other substantially entire regions are effective display regions.

  When the display data in the display area is removed from the binder unit 1a of the main device 1 as described above, all or part of the display data is erased under a predetermined condition. In addition, the arrow direction in the figure has shown the extraction direction (right direction) at the time of removing the electronic paper 2 hold | maintained at the binder part 1a. The main device 1 uses the electronic paper 2 on the condition that the display content of the electronic paper 2 detects that the data to be concealed is included or the data within the range to be concealed is designated by the user operation. The display contents are erased by applying a predetermined voltage between a pair of electrodes to constitute a single color display (full black display or full white display). In addition, a readable / writable non-volatile memory chip 2b is built in one corner of the electronic paper 2 (upper left corner in the figure), and the main body device 1 has various types displayed on the electronic paper 2. When the confidential range of data to be concealed is specified from the data, the confidential data is encrypted and written to the memory chip 2b of the electronic paper 2. This encryption may be performed when data is displayed or when data is deleted.

FIG. 3 is a diagram specifically illustrating display data in the display area of the electronic paper 2.
Here, among the display data for one page displayed in the display area of the electronic paper 2, the data within the rectangular range surrounded by the one-dot chain line in the figure is the display data within the erasure range (confidential range) ( Graphs and tables). That is, the display data in the erasure range (confidential range) indicates that the data is to be concealed, and also indicates that the display of the data in the range is erased when the electronic paper 2 is removed. . Display data within the erase range (confidential range) is encrypted and written to the memory chip 2 b of the electronic paper 2. At this time, in addition to the encrypted data and its encryption key, an erase range (confidential range) is also written to the memory chip 2b.

  The erasure range (confidential range) is, for example, in the illustrated example, the upper left coordinates (50, 1000) and the lower right coordinates (120, 1900) as indicated by two-point coordinates (for example, upper left coordinates and lower right coordinates). ) In addition, all the display data except for the data within the confidential range remains displayed even after the electronic paper 2 is removed. The memory chip 2b is a non-volatile memory that retains the stored contents even after the electronic paper 2 is removed and the power is cut off. When the electronic paper 2 is attached again, the main device 1 The encrypted data (encrypted data) in the chip 2b is decrypted by using the encryption key as it is, and arranged and displayed within the original secret range.

FIG. 4 is a block diagram illustrating basic components of the electronic paper device.
The main body device 1 of the electronic paper apparatus includes various electronic components that constitute a power supply circuit, a display control circuit, an overall control circuit, and the like, and operates with the control unit 11 as a core. The control unit 11 operates by supplying power from a power source unit (for example, commercial power source) 12 and controls a central processing unit and a memory (memory) that controls the overall operation of the electronic paper device according to various programs in the storage unit 13. (Not shown). The storage unit 13 is configured by combining two or more such as ROM, RAM, hard disk, and flash memory, and includes a program storage unit M1, a data storage unit M2, and the like.

  The program storage unit M1 stores a program and various applications for realizing the present embodiment in accordance with the operation procedure shown in FIGS. 5 and 6, and stores various data necessary for the program. ing. The data storage unit M2 is an area for storing and storing data to be displayed on the electronic paper 2. The control unit 1 includes various buttons such as an operation unit 14, a power button 1c, and a release button 1d. The control unit 1 performs processing according to an input operation signal from the operation unit 14. The PC connection unit 15 is a USB (Universal Serial Bus) interface connected to the PC 3 by a cable. The electronic paper connection unit 16 includes the above-described connection unit 1g in the binder unit 1a, has a power supply terminal and a signal terminal, supplies power to the electronic paper 2, and inputs display data.

  Next, the operation concept of the electronic paper apparatus in the present embodiment will be described with reference to the flowcharts shown in FIGS. Here, each function described in these flowcharts is stored in the form of a readable program code, and operations according to the program code are sequentially executed. Further, it is possible to sequentially execute the operation according to the above-described program code transmitted via a transmission medium such as a network. The same applies to other embodiments described later. In addition to the recording medium, an operation peculiar to the present embodiment can be executed using a program / data supplied externally via a transmission medium.

5 and 6 are flowcharts showing an outline of the operation of the electronic paper apparatus, and the execution is started when the power is turned on.
First, the control unit 11 accesses the electronic paper connection unit 16 to check whether the electronic paper 2 is connected (step A1 in FIG. 5), and enters a standby state until the electronic paper 2 is connected. When 2 is connected (YES in step A1), the display start button 1e is waited for operation (step A2). Here, when the display start button 1e is operated (YES in step A2), the PC 3 is requested to transfer the display data, and the display data (image data) transmitted from the PC 3 side in response thereto is received and acquired. (Step A3). In this case, the PC 3 transmits the display data read from the DB 4 to the electronic paper device together with the encryption key, and the control unit 11 of the electronic paper device acquires the display data and the encryption key, and displays the display data. It is displayed on the electronic paper 2 (step A4).

  When the display data is displayed on the electronic paper 2 in this way, the user (viewer) confirms that the data to be concealed (for example, personal data or confidential data) is included. A concealment instruction operation for designating a concealment range and instructing to be concealed is performed. In this case, the concealment instruction operation is performed by a keyboard or mouse operation on the PC 3 side. However, a concealment instruction button or a cursor button may be provided on the operation unit 14 or may be performed on the PC 3 side. You may enable it to select arbitrarily whether to carry out by the electronic paper apparatus side. Here, the control unit 11 checks whether or not a concealment instruction operation has been performed (step A5), or checks whether a concealment range is added to the display data (step A6). Note that the concealment range added to the display data is added in advance on the PC 3 side, and when the display data is acquired from the PC 3 side, the concealment range added to the display data is also acquired. I am doing so.

  If the concealment instruction operation has not been performed (NO in step A5) and no data indicating the presence of concealment has been added to the display data (NO in step A6), the process proceeds to step A10 described later. However, if a concealment instruction operation is performed (YES in step A5) or a concealment range is added (YES in step A6), the process proceeds to the next step A7, where there is concealment data in the display data. In order to show that, the secret flag is turned on. Then, the data within the secret range is encrypted using the encryption key (step A8). In this case, the data of the portion corresponding to the concealment range where the concealment instruction operation is performed and the data of the portion corresponding to the concealment range added to the display data are encrypted. If so, all the display data for one page is encrypted. The encrypted data thus encrypted is written into the memory chip 2b of the electronic paper 2 together with the encryption key and the secret range (step A9).

  In this state, it is checked whether the release button 1d has been operated (step A10), whether the display switching button 1f has been operated (step A11), or whether the power-off operation has been performed by the power button 1c. However, an operation wait state is entered (step A12). Here, when the power-off operation is performed (YES in step A12), the flow of FIG. 5 and FIG. 6 ends at this point, but when the display switching button 1f is operated (YES in step A11). The contents stored in the memory chip 2b of the electronic paper 2 are cleared, and the above-described secret flag is turned off (step A13). Then, after designating the next display data and requesting the PC 3 to transfer it (step A14), the process returns to the above-described step A3, and the display data and the encryption key are received and acquired from the PC 3 side. Display on paper 2 (step A4). Thereafter, similarly, the display data in the secret range is encrypted and written into the memory chip 2b of the electronic paper 2 (steps A7 to A9).

  Now, when the release button 1d is operated (YES in step A10), the flow proceeds to the flow of FIG. 6 and the holding mechanism (locked state) of the electronic paper 2 is released by operating the lock mechanism of the clamping unit 1h (step A15). ). As a result, the electronic paper 2 is in a state where it can be removed (removed) from the main body device (base unit) 1. In this state, it is checked whether the concealment flag is turned on (step A16). If the concealment flag is turned on (YES in step A16), among the display data for one page displayed on the electronic paper 2, The display of the data corresponding to the secret range stored in the memory chip 2b is deleted (step A17). In this case, by applying a predetermined voltage to the portion corresponding to the concealment range and displaying it in a single color (full black display or full white display), the display of the data corresponding to the concealment range is erased.

  Thereafter, the electronic paper connection unit 16 is accessed to check whether the electronic paper 2 is connected (step A18), and the electronic paper 2 is in a standby state until the electronic paper 2 is connected. Now, if the electronic paper 2 is connected (YES in step A18), the lock mechanism of the holding part 1h is operated to lock the electronic paper 2 (step A19), and then the concealment flag is turned on. (Step A20), and if the concealment flag is turned off (NO in Step A20), it is a case where the display target data is not included in the display data, so the process proceeds to Step A10 in FIG. Waiting for operation.

  If the concealment flag is turned on (YES in step A20), the encryption key, the encrypted data, and the concealment range are read out and acquired from the memory chip 2b of the electronic paper 2 (step A21), After decryption with the encryption key (step A22), the decrypted data is arranged and displayed in the portion corresponding to the confidential range in the display for one page displayed on the electronic paper 2 (step A23). As a result, the display content of the electronic paper 2 is restored to the original state. Thereafter, the process proceeds to step A10 in FIG. 5 and enters an operation waiting state. In this state, when the display switching button 1f is operated (YES in step A10), the next display is performed by repeating the same operation as described above. Data is designated and displayed on the electronic paper 2.

  As described above, in the first embodiment, the control unit 11 detects that the electronic paper 2 is detached from the binder unit 1a when the electronic paper 2 is detachably held in the binder unit 1a. Since the display of all or a part of the data displayed on the electronic paper 2 is erased when the electronic paper 2 is removed from the main unit 1 and used, Leakage can be appropriately prevented, there is no worry of being stolen while being carried or viewed, and illegal take-out of the electronic paper 2 can be prevented indirectly, which is beneficial for security.

  When the release button 1d for instructing the release of holding of the electronic paper 2 is operated, it is detected that the electronic paper 2 is being removed, so that the release button 1d is removed before the electronic paper 2 is removed. The display of data displayed on the electronic paper 2 can be erased by using the time from when the electronic paper 2 is operated until the electronic paper 2 is actually removed.

  Since the display of the data within the concealment range added in advance on the PC 3 side among the display data displayed on the electronic paper 2 is erased, the data to be concealed is appropriately erased when the electronic paper 2 is removed. can do.

  When the data to be concealed is arbitrarily designated by the user operation from the display data displayed on the electronic paper 2, the data within the designated range is erased as the concealment target. Prior to removal, the data display can be appropriately erased as needed.

  Since the display data to be erased as a secret object is encrypted and written to the memory chip 2b built in the electronic paper 2, when the electronic paper 2 is reconnected, it is not reconnected to the original electronic paper device. Even when connected to another electronic paper device, the encrypted data in the memory chip 2b is decrypted, so that other electronic paper devices can be redisplayed on the electronic paper 2. In this case, ID authentication or the like may be made a condition between the other electronic paper device and the electronic paper 2.

  Since the display data to be erased as a secret object is encrypted and written to the memory chip 2b built in the electronic paper 2, the encryption key is written to the memory chip 2b, so that it is not connected to the original electronic paper device to be removed. However, even if connected to another electronic paper device, the encrypted data in the memory chip 2b can be easily decrypted.

  The display data to be erased as a secret object is written in the memory chip 2b in the electronic paper 2, and the erase range indicating the range of data to be erased from the data displayed on the electronic paper 2 (the confidential range) ) Is stored in the memory chip 2b, the data in the erasure range (confidential range) can be arranged and displayed at the original position when the electronic paper 2 is reconnected.

  When the electronic paper 2 is attached, the display data erased when the electronic paper 2 is removed is displayed again. Therefore, the display content can be easily restored simply by attaching the electronic paper 2.

  In the above-described first embodiment, the time from when the release button 1d is operated before the electronic paper 2 is removed until the electronic paper 2 is actually removed is displayed on the electronic paper 2. The display data display is erased, but if the power supply to the electronic paper 2 is maintained after the removal of the electronic paper 2 is actually started, the time is reduced. The display of the display data displayed on the electronic paper 2 can be erased by using it. In this case, when the power supply terminal in the electronic paper connection part 16 is formed longer in the insertion / removal direction of the electronic paper 2 than the signal terminal, and the connection between the signal terminal in the electronic paper connection part 16 and the electronic paper 2 is released. The electronic paper 2 may be detected to be removed. As a result, the display of the data to be concealed can be erased simply by pulling out (pulling out) the electronic paper 2.

  Moreover, when encrypting the data within the confidential range among the data displayed on the electronic paper 2, either the common key encryption method or the public key encryption method may be adopted. When the common key cryptosystem is adopted, the encryption key used for the encryption is used. When the public key cryptosystem is adopted, the decryption key (secret key or public key) is used. May be written in the memory chip 2b of the electronic paper 2.

  In the first embodiment described above, among the data displayed on the electronic paper 2, the data within the confidential range is encrypted, and the encrypted data or the like is written in the memory chip 2 b of the electronic paper 2. An identifier (for example, a data management number) for identifying data displayed on the electronic paper 2 may be written in the memory chip 2b. In this case, when the electronic paper 2 is reconnected, an identifier for identifying display data is read from the memory chip 2b, and the display data corresponding to the identifier is read and displayed on the electronic paper 2 again. . If the identifier is stored in the memory chip 2b as described above, the memory chip 2b can be small in capacity as well as simplifying the process at the time of erasing or redisplaying the data.

  In the first embodiment described above, when the display data erased when the electronic paper 2 is attached is displayed again, the encrypted data and the encryption key are read from the memory chip 2b and displayed again. However, the authentication process for verifying the encryption key held on the electronic paper device side and the encryption key held on the electronic paper 2 side is executed, and as a result, the decryption process is performed on condition that the two match. You may make it display again.

(Embodiment 2)
A second embodiment of the present invention will be described below with reference to FIGS.
In the first embodiment described above, when it is detected that the electronic paper 2 is in the state of being removed from the binder unit 1a, the display of data displayed on the electronic paper 2 is erased. In this second embodiment, a light control sheet for controlling the transmission and shielding of light is attached to a part of the display surface of the electronic paper 2, and a part of the display data displayed on the electronic paper 2 is transferred to the light. The control sheet is shielded or transmitted. Here, in both the embodiments, the same or the same names are denoted by the same reference numerals, the description thereof will be omitted, and the following description will focus on the features of the second embodiment. .

FIG. 7 is a view for explaining the electronic paper 2 in the second embodiment.
The electronic paper 2 according to the second embodiment has the connection portion 2a that is electrically connected to the main body device 1 as described above, and controls transmission and shielding of light to a predetermined area in the display surface of the electronic paper 2. A reflection type liquid crystal panel sheet 5 is attached as a light control sheet. The reflective liquid crystal panel sheet 5 transmits light when power is supplied from the main body device 1, and shields light when power is cut off by removing the electronic paper 2 from the main body device 1. TN (Twisted Nematic type) liquid crystal panel sheet. In the illustrated example, the reflective liquid crystal panel sheet 5 is attached and fixed to the approximately 2/3 region from the lower end of the electronic paper 2. This is a predetermined portion as an area where data is likely to be displayed.

FIG. 8 is a diagram for schematically explaining the operating state of the electronic paper 2 and the liquid crystal panel sheet 5 in a portion where the reflective liquid crystal panel sheet 5 is attached to a part of the display surface of the electronic paper 2 in the second embodiment. It is. In the figure, the arrow direction indicates the direction in which the user views the display surface of the electronic paper 2.
The reflective liquid crystal panel sheet 5 twists the orientation of liquid crystal molecules called TN liquid crystal between a pair of opposing substrates by 90 degrees, and the liquid crystal molecules are perpendicular to the substrate in a state where a voltage is applied. The light is in a transmission state that passes through the liquid crystal layer, but when no voltage is applied, the liquid crystal molecules are aligned in a direction parallel to the substrate, and the light is blocked by the liquid crystal layer. Become. In the electronic paper 2, as described above, a voltage is applied between the pair of electrodes in a state where the charged charged particles (charged bodies) are filled in the medium between the pair of electrodes facing each other. Then, the display is performed by moving the charged particles in the medium in a direction corresponding to the applied voltage, but the display content is visible or invisible due to light transmission or shielding by the reflective liquid crystal panel sheet 5. Or

FIG. 9 is a flowchart showing an outline of the operation of the electronic paper device according to the second embodiment, which starts to be executed when the power is turned on.
First, the control unit 11 accesses the electronic paper connection unit 16 to check whether the electronic paper 2 is connected (step B1), and enters a standby state until the electronic paper 2 is connected. If it is (YES in step B1), the display start button 1e is waited for (step B2). When the display start button 1e is operated (YES in step B2), power supply to the reflective liquid crystal panel sheet 5 attached to the electronic paper 2 is started, and the reflective liquid crystal panel sheet 5 is After making the transmission state, the display data is requested to be transferred to the PC 3, and the display data (image data) transmitted from the PC 3 is acquired in response (Step B3) and displayed on the electronic paper 2 ( Step B4).

  Thus, in the state where the display data is displayed on the electronic paper 2, the control unit 11 checks whether the display switching button 1f has been operated (step B5) or whether the power-off operation has been performed by the power button 1c. The electronic paper connection unit 16 is accessed to check whether the electronic paper 2 has been removed (step B8). Here, when the power-off operation is performed (YES in step B7), the flow of FIG. 9 ends at this point, but when the display switching button 1f is operated (YES in step B5), the next display is performed. After designating the data and requesting the transfer to the PC 3 (step B6), the process returns to the above-mentioned step B3, and the display data transmitted from the PC 3 side in response to the transfer request is acquired and displayed on the electronic paper 2 (Step B4).

  When the electronic paper 2 is removed (YES in step B8), the power supply to the electronic paper 2 is cut off, and then the electronic paper 2 is accessed to check whether the electronic paper 2 is connected. (Step B9). When the electronic paper 2 is connected (YES in step B9), the process proceeds to the above-described step B3, and the display data transmitted from the PC 3 side after starting the power supply to the reflective liquid crystal panel sheet 5 of the electronic paper 2 is started. (Image data) is acquired and displayed on the electronic paper 2 (step B4). Thereafter, the above operation is repeated.

  As described above, the electronic paper 2 according to the second embodiment has the connection portion 2a that is electrically connected to the main body device 1, and controls transmission and shielding of light in a predetermined area within the display surface of the electronic paper 2. Since the reflection type liquid crystal panel sheet 5 is attached as the light control sheet, the reflection type liquid crystal panel sheet 5 is made to emit light depending on whether or not it is electrically connected to the main unit through the connection portion 2a. It can be switched between a transmitting state and a light shielding state, and even when the electronic paper 2 is detached from the main body device 1 and used, data leakage can be prevented appropriately, and it can be seen while being carried or viewed. Without worrying, it is possible to indirectly prevent the electronic paper 2 from being illegally taken out, which is useful in terms of security.

In the second embodiment described above, the reflective liquid crystal panel sheet 5 is attached to a part of the display surface of the electronic paper 2, but the reflective liquid crystal panel sheet 5 may be attached to the entire display surface. Good.
Moreover, in 2nd Embodiment mentioned above, although the reflective liquid crystal panel sheet | seat 5 was illustrated as a light control sheet which controls permeation | transmission and shielding of light, it is not restricted to this but is arbitrary.

  In addition, although the electronic paper apparatus in each embodiment mentioned above illustrated the stand type, the whole shape, such as a double-opening type like a book type, and a wall hanging type, is not ask | required. . The stand 1b is provided with a power button 1c, a release button 1d, a display start button 1e, and a display switching button 1f as various buttons, but these buttons may also be used as a keyboard on the PC 3 side. Good.

Further, in each of the above-described embodiments, the microcapsule type electronic paper 2 using the electrophoretic phenomenon is shown, but the electronic paper 2 such as a liquid crystal type may be used.
In each of the above-described embodiments, the present invention is applied to an electronic paper device as a display-only device. , PDA, digital camera, music player, etc.

  In addition, the “apparatus” and “unit” shown in each of the above-described embodiments may be separated into a plurality of cases by function, and are not limited to a single case. In addition, each step described in the above-described flowchart is not limited to time-series processing, and a plurality of steps may be processed in parallel or separately.

1 Main unit (base unit)
DESCRIPTION OF SYMBOLS 1a Binder part 1b Stand stand 1c Power button 1d Release button 2 Electronic paper 2a Connection part 2b Memory chip 3 Personal computer (PC)
4 Database (DB)
5 reflective liquid crystal panel sheet 11 control unit 13 storage unit 14 operation unit 15 PC connection unit 16 electronic paper connection unit

Claims (14)

A data display device for displaying data on electronic paper as a display medium,
Holding means for detachably holding the electronic paper;
Detecting means for detecting whether the electronic paper is removed from the holding means in a state in which display data is displayed on the electronic paper attached by the holding means;
Display control means for erasing display of at least a portion of the display data displayed on the electronic paper when the detection means detects that the electronic paper is in a state of being removed; and
A data display device comprising: The detection means detects that the electronic paper is in a state of being removed when a release operation is performed to instruct the release of the electronic paper holding state prior to the removal of the electronic paper.
The data display device according to claim 1, wherein the data display device is configured as described above. The holding means has a connection part for supplying electric power to the electronic paper to be electrically connected, and the connection part has a plurality of terminals including a power supply terminal, and the electronic paper is electrically connected to the electronic paper. The power supply terminal is formed longer in the removal direction of the electronic paper than the signal terminal so that the power supply to the electronic paper is maintained from the start of removal of the electronic paper in the attached state until the removal. And
The detection means detects that the electronic paper is in a state of being removed when the connection between the signal terminal in the connection portion and the electronic paper is released.
The data display device according to claim 1, wherein the data display device is configured as described above. The display control means erases display data within a predetermined range as display target data among display data displayed on the electronic paper.
The data display device according to claim 1, wherein the data display device is configured as described above. Further comprising designation means for arbitrarily designating the data to be concealed from the display data displayed on the electronic paper;
The display control means erases the display of the data to be concealed designated by the designation means among the display data displayed on the electronic paper.
The data display device according to claim 1, wherein the data display device is configured as described above. A non-volatile storage unit built in the electronic paper;
Storage control means for encrypting display data to be erased as the concealment target and storing it in the nonvolatile storage unit,
Further comprising
The data display device according to claim 1, wherein the data display device is configured as described above. The storage control means encrypts display data to be erased as a concealment target and stores it in the nonvolatile storage unit in the electronic paper, and stores the encryption or decryption key in the nonvolatile storage unit.
The data display device according to claim 6, which is configured as described above. A non-volatile storage unit built in the electronic paper;
The display data to be erased as the object to be concealed is stored in the non-volatile storage unit in the electronic paper, and the erasure indicating which range of data is erased from the display data displayed on the electronic paper Second storage control means for storing a range in the nonvolatile storage unit;
Further comprising
The data display device according to claim 1, wherein the data display device is configured as described above. When the electronic paper removed from the holding means is attached, the display control means redisplays the erased display data on the electronic paper.
The data display device according to claim 1, wherein the data display device is configured as described above. A non-volatile storage unit built in the electronic paper;
Third storage control means for storing an identifier for identifying display data to be erased as the concealment target in the nonvolatile storage unit;
Further comprising
The data display device according to claim 1, wherein the data display device is configured as described above. A display medium constituting electronic paper for displaying data,
A connection portion electrically connected to a data display device that removably holds the electronic paper;
A light control sheet that is attached to the display surface of the electronic paper and controls transmission and shielding of light; and
A display medium comprising: The light control sheet is a reflective liquid crystal panel sheet.
The display medium according to claim 11. The light control sheet transmits light when the electronic paper is attached to the data display device and is supplied with power from the data display device, and the electronic paper is removed from the data display device to supply power. Shields light when is blocked
The display medium according to claim 11, which is configured as described above. Against the computer,
A function of detecting whether the electronic paper is removed from the holding means in a state where display data is displayed on the electronic paper attached by the holding means for detachably holding the electronic paper as a display medium; ,
A function of erasing display of at least a portion of the display data displayed on the electronic paper when it is detected that the electronic paper is in a state of being removed; and
A program to realize

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