JP2007088854A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of preventing copying of the content by a user. <P>SOLUTION: When a fact that a document displayed on a display screen is copied by a copying machine is detected, information, indicating the storage area of page data of a page which cannot be displayed, is stored in page data offset for non-display (steps 206-208). Thus, when the document being displayed on the display screen is copied, a punishment that disables redisplay of the document can be given. Consequently, for example, the user is made to predict that cost for copying of the document is expensive, for dissuading copying of the document, in comparison with a method that does not give punishment at all for imaging of the document, and permitting redisplay of the copied document and as a result, copy of the document by the user is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device that displays a plurality of contents.

Conventionally, as this type of display device, for example, there is a display device that displays the contents of an electronic book on a reflective display such as a cholesteric liquid crystal (for example, see Patent Document 1).
JP-A-11-271799

However, since the content is displayed on the reflective display in the conventional display device, for example, when the weight and thickness are reduced, the display screen is placed on the contact glass of the copying machine. You may be able to copy the content displayed on.
An object of the present invention is to solve an unsolved problem of the conventional display device described above, and an object of the present invention is to provide a display device capable of preventing content duplication by a user.

In order to solve the above-described problem, a display device according to a first invention is a display device that displays a plurality of contents, and an imaging detection unit that detects that a specific content displayed on a display screen has been imaged. And display prohibiting means for preventing the specific content from being displayed again when imaging of the specific content is detected.
According to such a configuration, when the content displayed on the display screen is imaged, a penalty that prevents the content from being displayed again can be given. Therefore, by informing the user that there is such a penalty, for example, there is no penalty for capturing the content, and the price of capturing the content to the user compared to a method that allows the captured content to be displayed again. Can foresee the cost of the content and discourage the shooting of the content, and as a result, the content can be prevented from being duplicated by the user.

In addition, when it is detected that the specific content is about to be captured, and imaging foreseeing means for detecting that the specific content is about to be captured, a display of the specific content with a watermark ( Display rewriting means for rewriting the text image) into a superimposed display.
Furthermore, when it is detected that the specific content is about to be captured, and imaging foreseeing means for detecting that the specific content is about to be captured, a display of the specific content is displayed on the specific content as a ground pattern (ground pattern). Display rewriting means that rewrites the pattern image) to a superimposed display. According to such a configuration, when the content displayed on the display screen is shot, the content is Marks and background patterns can be displayed in an overlapping manner. Therefore, for example, it is possible to prevent the visibility of the content from being deteriorated even when the display gradation is low as compared with the method in which the watermark or the ground pattern is always superimposed and displayed on the content.

  On the other hand, the display device according to the present invention is a display device that displays a plurality of contents, in which data storage means for storing data of the plurality of contents and data of the stored specific contents are copied. A copy detecting means for detecting that the specific content has been copied, and a display prohibiting means for prohibiting display of the specific content when it is detected that the specific content has been copied.

Also, a copy preview means for detecting that the data of the specific content is about to be copied, and if it is detected that the specific content is about to be copied, the data of the specific content is transferred to the specific content. Data rewriting means for rewriting data to be displayed with the mark superimposed may be provided.
Further, copy foreseeing means for detecting that the data of the specific content is about to be copied, and an electronic device for adding a digital watermark to the data of the specific content when it is detected that the specific content is about to be copied And a watermark adding means.

And determining means for determining whether or not copying of the specific content is permitted, wherein the display prohibiting means prohibits display of the specific content only when the copying is not permitted. Also good.
According to such a configuration, if the content data stored in the data storage means is copied, a penalty can be given that makes it impossible to display the content. Therefore, by informing the user that there is such a penalty, for example, there is no penalty for copying the data, and the user is compensated for the copy of the data compared to a method that allows display of the copied content. It can be expected to be expensive and discourage data copying, and as a result, content duplication by the user can be prevented.

Hereinafter, an embodiment of an electronic book reader that displays and browses an electronic book document divided into predetermined pages as a display device according to the present invention will be described with reference to the drawings.
That is, the electronic book reader is configured to switch and display the next page of the document (page) displayed on the display device when a page turning operation is performed. In addition, when it is detected that the document displayed on the display screen has been copied by a copying machine, information indicating that the document has been copied is added to prohibit display again. .

<First Embodiment>
<Configuration of electronic book reader>
FIG. 1 is a schematic configuration diagram showing the external shape of the electronic book reader of this embodiment, and FIG. 2 is a block diagram showing the internal configuration of the electronic book reader of this embodiment. As shown in FIG. 2, an electronic book reader 1 includes a page feed button 2, light receiving sensors 3 ₁ and 3 ₂ , an input / output device (I / O) 4, a read only memory (ROM) 5, and a random access memory (RAM). ) 6, a central processing unit (CPU) 7, a video ram (VRAM) 8, a display controller 9 and a display device 10, and includes a page feed button 2, light receiving sensors 3 ₁ and 3 ₂ , a page return button 2 and a display Each part except for the device 10 is connected to each other by a bus 11.

The page feed button 2 is a push button that is operated when the page of the document displayed on the display device 10 is switched to the next page. When the page feed button 2 is pressed, it indicates that the page feed button 2 has been pushed down. The pressing signal shown is output to the input / output device 4.
The light receiving sensors 3 ₁ , 3 ₂ are arranged on the upper right side and the lower left side of the display screen of the display device 10, detect the amount of incident light on the display screen of the display device 10, and output it to the input / output device 4.

The input / output device 4 outputs to the CPU 7 the press signal output from the page feed button 2 and the detection result of the incident light amount output from the light receiving sensors 3 ₁ and 3 ₂ .
The ROM 5 stores various programs such as a basic control program and application programs executed by the CPU 7 and data related to these various programs.
The RAM 6 forms a work area for developing various programs when the CPU 7 executes programs, and also has a memory area for storing data relating to various programs executed by the CPU 7 and data of a plurality of documents to be displayed. Form.

Here, as shown in FIG. 3, the data of each document includes a document header of a corresponding document (document), a plurality of page headers, and a plurality of page data.
As shown in FIG. 4, the document header includes a document title, the number of pages, copy control information, a copy limit count, a copied flag, a related document quantity, and a related document link.

The copy limit number is the permitted number of copies of the corresponding document, and is set in advance by the document creator.
The copied flag is a flag indicating the number of times the corresponding document has been copied, and is 0 when the document has never been copied, and 1 is added to the flag value every time the document is copied.
The related document link is information indicating a storage location of data of a document related to the corresponding document (for example, a document referred to when browsing the corresponding document).

The page header is provided corresponding to each page included in the corresponding document. As shown in FIG. 5, the page number, copy control information, copy limit count, copied flag, related page quantity, related page number, and It is configured to include a non-display page data offset.
The copy control information is information indicating whether or not copying of the corresponding page is permitted, with a value of 0 to 3. 0 indicates that copying of the corresponding page is permitted without limitation, and 1 indicates the corresponding page. Indicates that copying is permitted on the condition that a watermark is added at the time of copying. Reference numeral 2 indicates that copying of the corresponding page is not permitted. As shown in FIG. 10 is associated with the page data of the non-displayable page that displays only the message “This page has been deleted because it has been copied” in the document (page) displayed in FIG. Indicates that a penalty for rewriting the display is given, and 3 indicates that the corresponding page is not allowed to be copied, and a watermark is added at the time of copying. Shows that give penalties associated with the page data not available page in the document (page) displayed on the shown device 10. Note that the copy control information is added by the author when creating document data, and for example, the user cannot rewrite the copy control information later.

The copy limit number is the permitted number of copies of the corresponding page, and is set in advance by the document creator.
The copied flag is a flag indicating the number of times the corresponding page has been copied, and is 0 when the corresponding page has not been copied, and 1 is added to the flag value every time the page is copied.
The non-display page data offset is information indicating the address of the page data storage area of the page to be replaced with the corresponding page, and takes 0 when there is no replacement page.

The related page number is a page number of a page related to the corresponding page.
On the other hand, the page data is raster data of each page included in the corresponding document.
The CPU 7 reads various programs stored in the ROM 5, develops them in a work area formed in the RAM 6, and controls the units 2 to 10.
Further, when a pressing signal is output from the input / output device 4, the CPU 7 executes display page switching processing (described later), and the document header and page header of the next page of the document (page) displayed on the display device 10. It is determined whether or not the copy completed flag is smaller than the copy limit count. If the copy limit flag is smaller than the copy limit count, the page data of the next page is read from the RAM 6 and stored in the VRAM 8. The page data (raster data) of the non-displayable page stored in the area indicated by the page data offset value is read from the RAM 6 and stored in the VRAM 8.

Further, the CPU 7 executes a page copy corresponding process (described later) every time a predetermined time (for example, 10 msec.) Elapses, and when the light receiving sensors 3 ₁ and 3 ₂ detect the scanning light of the copying machine, the display device 10. The page data offset for non-display of the page and the copied flag are set based on the page copy control information of the document (page) displayed in.
The VRAM 8 stores raster data in accordance with a storage request from the CPU 7.

The display controller 9 reads the raster data stored in the VRAM 8 and drives the display device 10 so that the page indicated by the raster data is displayed.
The display device 10 is driven by the display controller 9 and displays an arbitrary page of a document on a display screen. The display screen is an electrophoretic display body in which a plurality of pixels are formed in an array, that is, displays by reflecting external light incident on the display screen, and displays until then even if power is not supplied It is formed of a display that keeps displaying the contents as they are.

<CPU operation>
Next, the display page switching process executed by the CPU 7 will be described with reference to the flowchart of FIG. This display page switching process is executed when a press signal is output from the input / output device 4. First, in step S101, the copied flag of the document header of the document displayed on the display device 10 is set. Whether the flag value of the read and copied flag is 1 or more is determined. When it is 1 or more (Yes), the process proceeds to step S102, and when it is smaller than 1 (No), the process proceeds to step S105.

In step S102, it is determined whether or not the flag value of the copied flag read in step S101 is smaller than the copy limit number of the document header of the document displayed on the display device 10. If it is smaller than the copy limit number (Yes), the process proceeds to step S103, and if it is equal to or greater than the copy limit number (No), the process proceeds to step S106.
In step S103, the copied flag of the page header of the document (page) displayed on the display device 10 is read, and it is determined whether or not the flag value of the copied flag is 1 or more. When it is 1 or more (Yes), the process proceeds to step S102, and when it is smaller than 1 (No), the process proceeds to step S105.

  In step S104, it is determined whether or not the flag value of the copied flag read in step S103 is smaller than the copy limit number of the page header of the document (page) displayed on the display device 10. When it is smaller than the copy limit number (Yes), the process proceeds to step S105, and when it is equal to or greater than the copy limit number (No), the process proceeds to step S106.

In step S105, the page data of the next page of the document (page) displayed on the display device 10 is read, and the display controller 9 is driven based on the page data, and then the calculation process is terminated. To do.
In step S106, the page data of the non-displayable page stored in the area indicated by the page data offset value of the next page of the document (page) displayed on the display device 10 is read from the RAM 6 and stored in the VRAM 8. Then, this calculation process is terminated.

Next, page copy handling processing executed by the CPU 7 will be described with reference to the flowchart of FIG. This page copy handling process is a process executed every predetermined time. First, in step S201, the detection result of the incident light quantity is read from the light receiving sensors 3 ₁ and 3 ₂ .
Next, the process proceeds to step S202, where it is determined whether any of the incident light amounts read in step S201 is greater than a threshold value (the amount of scan light emitted from the copying machine when the copying operation is executed). When it is larger than the threshold (Yes), the process proceeds to step S203, and when it is equal to or smaller than the threshold (No), the process proceeds to step S204.

In step S203, the page copy control information of the page header of the document (page) displayed on the display device 10 is read from the RAM 6.
In step S204, it is determined whether the value of the page copy control information read in step S203 is 0, 1, 2, or 3. If it is 0 (0 (copying is possible)), the process proceeds to step S209. If it is 1 (1 (copying is possible)), the process proceeds to step S205, and if it is 2 (2 (copying is not possible)). ) Move to step S206, and if 3 (3 (copy not possible)), move to step S207.

  In step S205, based on the document data stored in the RAM 6, raster data for displaying the watermark on the document displayed on the display device 10 is generated, and then the display controller is displayed based on the raster data. 9 immediately after the display device 10 is driven (after the display is switched before the scanning light emitted from the copying machine enters the display screen of the display device 10), the process proceeds to step S209.

  In step S206, as shown in FIG. 9, the page data of the non-displayable page is added to the document data displayed on the display device 10, and the address of the page data storage area of the non-displayable page is set to the page data. Store in non-display page data offset of page header. Then, the display controller 9 is driven after a few seconds based on the page data of the non-displayable page (after the display of the display device 10 is switched after the scanning by the copying machine is finished), and the process proceeds to step S209. .

In step S207, based on the document data stored in the RAM 6, raster data for displaying the watermark superimposed on the document displayed on the display device 10 is generated, and then the display controller is based on the raster data. 9 immediately drives the display device 10 (the display is switched before the scan light enters the display screen).
Next, the process proceeds to step S208, and the page data of the non-displayable page is added to the data of the document displayed on the display device 10 as shown in FIG. 9, and the address of the page data storage area of the non-displayable page is displayed. Is stored in the non-display page data offset of the page header of the page, and then the process proceeds to step S209.

  In steps S206 and S208 of this embodiment, the page data of the non-displayable page is added and the non-display page data offset is set, so that the document (page) displayed on the display device 10 cannot be redisplayed. Although an example of doing so has been shown, the present invention is not limited to this. For example, when adding page data of a non-displayable page, data of a document (page) displayed on the display device 10 may be deleted.

In step S209, 1 is added to the flag value of the copied flag in the page header of the document (page) displayed on the display device 10.
Next, the process proceeds to step S210, and it is determined whether or not the flag value obtained in step S209 is smaller than the copy limit number of the page header of the document (page) displayed on the display device 10. If it is smaller than the copy limit number (Yes), this calculation process is terminated, and if it is equal to or greater than the copy limit number (No), the process proceeds to step S211.

In step S211, the copied copy flag of the page indicated by the related page number of the document (page) displayed on the display device 10 is set as the copy limit count.
Next, the process proceeds to step S212, and after the copied flag of the document header of the document indicated by the related document link of the document displayed on the display device 10 is set as the copy limit count, this calculation process is terminated.

<Specific operation of electronic book reader>
Next, the operation of the electronic book reader 1 of the present embodiment will be described based on a specific situation.
First, in order to copy a specific document displayed on the display device 10, it is assumed that the user places the display screen of the display device 10 face down on the contact glass of the copying machine and performs an operation for starting copying. . Then, scanning light is emitted from the copying machine, and the scanning light is incident on _{one of the} light receiving sensors 3 ₁ and 3 ₂ , and when the page copy corresponding processing is executed by the CPU 7, as shown in FIG. Thus, the detection result of the incident light quantity is read from the light receiving sensors 3 ₁ , 3 ₂ , the determination in step S 202 becomes “Yes”, and the page copy control information of the page header of the specific document (specific page) is read from the RAM 6 in step S 203. Is read.

  Here, it is assumed that the value of the read page copy control information is 3. Then, the determination in step S204 is “2 (copy not possible)”. In step S206, the page data of the display disabled page is added to the data of the specific document, and the address of the storage area of the page data of the display disabled page is the specific page. After being stored in the non-display page data offset of the page header, a standby state is maintained until scanning by the copying machine is completed.

Further, it is assumed that the scanning by the copying machine is completed while the page copying processing is in a standby state. Then, the display device 10 is driven by the display controller 9 based on the page data of the non-displayable page in step S206 of the page copy handling process.
Then, by driving the display controller 9, as shown in FIG. 6, a display impossible page is displayed on the display device 10 in place of the document (page) displayed so far.

  Also, in step S209, if 1 is added to the flag value of the copied flag of the page header of the specific page, and the copy limit number of the document header and page header of the specific page is 1, the determination in step S210. Becomes “No”, the copied flag of the page indicated by the related page number of the specific page is set as the copy limit number of the page header in step S211, and the document indicated by the related document link of the specific document is copied in step S212. After the flag is set to the copy limit number of the document header, the calculation process is terminated.

  Thereafter, the user presses the page feed button 2 in order to display the specific page again in a state where the previous page of the specific page whose copy completed flag is copy restriction is displayed on the display device 10. To do. Then, a press signal is output from the page feed button 2 to the CPU 7 via the input / output device 4, the display page switching process is executed by the CPU 7, and the determination in step S101 is “Yes” as shown in FIG. The determination in S102 is “Yes”, the determination in Step S103 is “Yes”, the determination in Step S104 is “No”, and the page data offset value of the next page of the specific page is stored in the area indicated by Step S106. The display device 10 is driven by the display controller 9 based on the page data of the display disabled page. Then, the display controller 9 drives the display disabled page to be displayed on the display device 10 as shown in FIG.

  As described above, in the electronic book reader 1 according to the present embodiment, when it is detected that the document displayed on the display screen has been copied by the copying machine, the non-displayable page data offset includes the page that cannot be displayed. Information indicating the storage area of page data is now stored. For this reason, if a document displayed on the display screen is copied, a penalty that prevents the document from being displayed again can be given. Therefore, by informing the user that there are such penalties, for example, the penalties for copying a document can be made to the user as compared to a method that does not impose any penalties on document imaging and allows the copied document to be displayed again. Can be foreseen and can be discouraged from copying the document, and as a result, preventing the user from copying the document.

  On the other hand, assume that the value of the read page copy control information is 3. Then, the determination in step S204 is “3 (copy not possible)”, and in step S207, raster data for displaying the watermark over the specific document is generated based on the data of the specific document, and then the raster data is displayed. Based on this, the display device 10 is immediately driven by the display controller 9. Then, by driving the display controller 9, an image based on the raster data is displayed on the display device 10 before the scan light enters the display screen.

In step S208, the page data of the non-displayable page is added to the data of the specific document, and the address of the page data storage area of the non-displayable page is stored in the non-display page data offset of the specific page. The flow of step S209 is executed.
On the other hand, it is assumed that the value of the read page copy control information is 1. Then, the determination in step S204 is “1 (copied)”, and in step S205, raster data to be displayed with the watermark superimposed on the specific document is generated based on the data of the specific document. Based on this, the display device 10 is immediately driven by the display controller 9. Then, by driving the display controller 9, an image based on the raster data is displayed on the display device 10 before the scan light enters the display screen.

  As described above, in the electronic book reader 1 of the present embodiment, when the document displayed on the display screen is photographed, the watermark is displayed over the document. As a result, the watermark can be displayed in the copy result, the copyright of the document can be claimed based on the display of the watermark, and the traceability at the time of information leakage can be improved. Compared with the method of displaying the watermarks in an overlapping manner, it is possible to prevent the visibility of the document from being lowered even when the display gradation of the display device 10 is poor.

By the way, in the method of always displaying the watermark so as to overlap the document, it is difficult to distinguish between the pixels constituting the document and the pixels constituting the watermark if the display device 10 has poor display gradation. As a result, the visibility of the document is reduced.
In the present embodiment, the example in which the light receiving sensors 3 ₁ and 3 ₂ are arranged on the upper right side and the lower left side in the plan view of the display device 10 is shown, but the present invention is not limited to this. For example, when the driving method of the display device 10 is an active matrix driving method, a light receiving sensor may be provided in an active element corresponding to each pixel of the display device 10. By doing so, when only a specific range of the document displayed on the display device 10 is copied, the specific range can be detected, and only the specific range of the copied document cannot be displayed again. can do.

In addition, although an example in which a non-displayable page is displayed when an operation for displaying a copied document (page) again is shown, the present invention is not limited to this. For example, the resolution of the copied page may be reduced, and the page whose details are unknown may be displayed.
Furthermore, although an example in which a watermark is superimposed and displayed when a document is photographed is shown, the present invention is not limited to this. For example, a background pattern may be displayed in an overlapping manner.

Next, a second embodiment of the display device according to the present invention will be described based on images.
In the second embodiment, the electronic book reader 1 is configured to be able to copy document data between the electronic book readers 1 via a personal computer by USB connection. Further, the electronic book reader 1 (CPU 7) executes a page copy compatible process before copying the document data, and rewrites the page data of the document and sets the non-display page data offset of the document. It is like that.

  Specifically, the page copy processing is executed when the USB communication protocol detects a document data copy instruction, and as shown in FIG. 10, first, in step S301, the document header of the document to be copied is updated. The copied flag is read, and it is determined whether or not the flag value of the copied flag is 1 or more. If it is 1 or more (Yes), the process proceeds to step S302. If it is less than 1 (No), this calculation process is terminated.

In step S302, copy control information of the document header of the document to be copied is read from the RAM 6.
In step S303, it is determined whether the value of the document copy control information read in step S302 is 0, 1, 2, or 3. If it is 0 (0 (copying is possible)), the process proceeds to step S308. If it is 1 (1 (copying is possible)), the process proceeds to step S304, and if it is 2 (2 (copying is not possible)). ) Move to step S305, and if 3 (3 (copy not possible)), move to step S307.

In step S304, raster data to be displayed with the watermark superimposed on each page of the document to be copied is generated, the raster data is stored in the RAM 6 in place of the previous page data, and then in step S308. Transition.
In step S305, first, instead of page data of each page of the document to be copied, the page data in advance is replaced with page data so that there is no problem in copyright law due to the presence of page data at both the copy source and the copy destination. Predetermined page data (for example, page data in which the entire surface is blank) is stored in the RAM 6.

  In the present embodiment, an example is shown in which predetermined page data is stored instead of page data of each page so as not to cause a problem in the copyright law. However, the present invention is not limited to this. For example, the page data of each page may be deleted. However, the method of storing predetermined page data is suitable for tracking the whereabouts of the copied document later because the document remains in the copy source.

In step S306, the page data of the non-displayable page is added to the document data, and the address of the storage area of the page data of the non-displayable page is set to the non-display page data offset of the page header of each page. After storing, the process proceeds to step S308.
In step S307, raster data to be displayed with the watermark superimposed on each page of the document to be copied is generated, the raster data is stored in the RAM 6 in place of the previous page data, and the process proceeds to step S305. Transition.

In step S308, 1 is added to the flag value of the copied flag in the document header of the document to be copied.
In step S309, it is determined whether or not the flag value obtained in step S308 is smaller than the copy limit number of the document header of the document to be copied. If it is smaller than the copy limit number (Yes), this calculation process is terminated, and if it is equal to or greater than the copy limit number (No), the process proceeds to step S310.

In the step S310, after the copied flag of the document header of the document indicated by the related document link of the document to be copied is set as the copy limit count, this calculation process is ended.
As described above, in the electronic book reader 1 of the present embodiment, when it is detected that the data of the document stored in the RAM 6 has been copied, the page data of the non-displayable page is set as the non-display page data offset. Information indicating the storage area of was stored. For this reason, if the data of the document is copied, a penalty can be given that makes it impossible to display the document. Therefore, by informing the user in advance that there is such a penalty, for example, the penalties for copying the data are given to the user as compared to a method that allows the display of the copied document without giving any penalty to the copy of the data. Can be foreseen and copy data can be discouraged, and as a result, user duplication of the document can be prevented.

  In the above embodiment, when document data is copied, raster data to be displayed with the watermark superimposed is stored in place of the previous page data, and the raster data is copied. However, the present invention is not limited to this. For example, data obtained by adding a digital watermark to the previous page data may be stored.

As described above, in the above embodiment, the light receiving sensors 3 ₁ and 3 ₂ in FIG. 1 and FIG. 2 and step S201 in FIG. 3 constitute the imaging detection means and imaging prediction means described in the claims, and so on. 2, step S102 in FIG. 7, step S209 in FIG. 8, and step S308 in FIG. 10 constitute display prohibiting means, and the CPU 7 in FIG. 2 and steps S205 and S207 in FIG. 8 constitute display rewriting means. 2 constitutes a data storage means, the CPU 7 (USB communication protocol) in FIG. 2 constitutes a copy detection means and a copy prediction means, and the CPU 7 in FIG. 2 and steps S304, S305, and S307 in FIG. The data rewriting means is configured, and the CPU 7 in FIG. 2, step S204 in FIG. 8, and step S303 in FIG.

Note that the display device of the present invention is not limited to the contents of the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
For example, after determining whether or not the amount of light incident on the light receiving sensors 3 ₁ and 3 ₂ is larger than the threshold value, the page copy control information is read, and raster data for displaying the watermark and the non-displayable page is created and displayed. However, the present invention is not limited to this example. For example, the page copy control information is read in advance, raster data for displaying a watermark or a non-displayable page is created in advance, and it is determined whether or not the amount of light incident on the light receiving sensors 3 ₁ and 3 ₂ is greater than a threshold value. Sometimes, the raster data may be displayed. By doing so, for example, compared to a method in which the creation of raster data is started after the determination of the amount of incident light, the raster data for displaying the watermark and the non-displayable page can be displayed at an earlier timing. When copying by the above, it is possible to reliably display the image by the raster data before the scanning light enters the display screen.

  In addition, as an example of displaying watermarks and non-displayable pages, an example in which raster data for displaying watermarks and non-displayable pages in an overlapping manner is created and the electrophoretic display is rewritten is shown, but the present invention is not limited to this. . For example, a second display body that is normally transparent on the front side of the electrophoretic display body and displays a watermark at the center when a voltage is applied is provided, and the electrophoretic display body is rewritten. The watermark or the display impossible page may be displayed by applying a voltage to the second display body without performing the above.

It is a schematic block diagram which shows the external shape of the electronic book reader of 1st Embodiment. It is a block diagram which shows the internal structure of the electronic book reader of FIG. It is explanatory drawing for demonstrating the structure of the data of a document. It is explanatory drawing for demonstrating the structure of a document header. It is explanatory drawing for demonstrating the structure of a page header. It is explanatory drawing for demonstrating a display impossible page. It is a flowchart which shows the flow of a display page switching process. It is a flowchart which shows the flow of a page copy corresponding | compatible process. It is explanatory drawing for demonstrating the structure of a document header. It is a flowchart which shows the flow of a page copy corresponding | compatible process.

Explanation of symbols

1 is an electronic book reader, 2 is a page feed button, 3 ₁ and 3 ₂ are light receiving sensors, 4 is I / O, 5 is ROM, 6 is RAM, 7 is CPU, 8 is VRAM, 9 is a display controller, 10 is Display device, 11 is bus

Claims (7)

A display device that displays a plurality of contents,
Imaging detection means for detecting that the specific content displayed on the display screen has been imaged; and display prohibiting means for preventing the specific content from being displayed again when imaging of the specific content is detected. A display device comprising:   Imaging foreseeing means for detecting that the specific content is about to be captured, and when the specific content is about to be captured, the specific content is displayed with a watermark over the specific content. The display device according to claim 1, further comprising display rewriting means for rewriting the display.   Imaging foreseeing means for detecting that the specific content is about to be imaged and, when it is detected that the specific content is about to be captured, the display of the specific content is overlaid on the specific content. The display device according to claim 1, further comprising display rewriting means for rewriting the display. A display device that displays a plurality of contents,
When it is detected that data storage means for storing the data of the plurality of contents, copy detection means for detecting that the data of the stored specific contents is copied, and that the specific contents are copied, And a display prohibiting means for prohibiting display of the specific content.   Copy foreseeing means for detecting that the data of the specific content is about to be copied, and when it is detected that the specific content is about to be copied, the data of the specific content is converted into a watermark on the specific content. 5. The display device according to claim 4, further comprising data rewriting means for rewriting the data to be displayed in a superimposed manner.   Copy predicting means for detecting that the data of the specific content is about to be copied, and digital watermark addition for adding a digital watermark to the data of the specific content when the specific content is detected to be copied The display device according to claim 4, further comprising: means. Determining means for determining whether or not copying of the specific content is permitted;
The display device according to claim 1, wherein the display prohibiting unit prohibits display of the specific content only when the copying is not permitted.

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