JP2006091226A - Electronic paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic paper which can easily be bundled together with other electronic papers without the occurrence of a functional hindrance to make an environment for use more comfortable. <P>SOLUTION: The electronic paper has an engagement part 30 formed thereon and is engaged with the engagement part 30 of another electronic paper EP by male-female engagement, and thus electronic papers EP are easily bundled and fixed. Since the engagement structure makes electronic papers free from holes resulting from stapling or the like, a functional hindrance is not given to display parts 2 or the like provided in the electronic papers EP. Flexible bending parts 32 are provided on boundaries with the engagement parts 30 so that a page turning operation of the bundled electronic papers EP is easy. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic paper in which image information is displayed and held on a display unit in a non-powered state, and the image information can be rewritten, and more particularly to an electronic paper capable of bundling and fixing a plurality of electronic papers.

Information obtained from a network or information such as a document created by a document processing apparatus is displayed on the display screen of a personal computer, or the image is displayed on a paper medium (paper) by a printer. It is offered to.
Compared to the method of displaying on the display screen, the method of printing the image information on paper can be easily carried at any time and anywhere in the browsing of such image information. There is an advantage that image information can be browsed, and a plurality of image information can be browsed simultaneously by printing the plurality of image information on a plurality of sheets.

In recent years, electronic paper has been developed as a display medium that can replace paper, which is a paper medium, that can display and hold image information without power on the display unit, and that is as thin and portable as paper. Has been.
The electronic paper is a display device having a display unit that displays and holds an image in a non-powered state.For example, the electronic paper is projected onto a self-writing type electronic paper having a function of writing an image on the display unit by itself based on electronic data. There are optical writing type electronic papers that hold a displayed image on a display portion.
Unlike electronic paper, such electronic paper can erase or overwrite the image displayed and held on the display unit, and can update or erase the image held on the display and use it repeatedly. Use promotion is also desired from the viewpoint of saving resources.

Here, regarding such electronic paper, an invention has been proposed in which the electronic paper can be attached to and detached from the electronic paper file and an image display process is performed on the display unit in accordance with the attached / detached state (see Patent Document 1).
Further, an invention has been proposed in which a plurality of pre-associated data is wirelessly transmitted to a plurality of electronic papers and an image is displayed on each electronic paper (see Patent Document 2).
In addition, an invention has been proposed in which electronic paper for transmission and electronic paper for reception are attached to an electronic paper file and content is transmitted between the electronic papers (see Patent Document 3).
In addition, an invention has been proposed in which data is wirelessly displayed on each electronic paper from a file device capable of mounting a plurality of electronic papers (see Patent Document 4).
Further, an invention has been proposed in which the content displayed on the display device is updated every time the user holding the display device such as electronic paper passes the vicinity of the writing device by the writing device provided in the user's action range (patent) Reference 5).
Japanese Patent Laid-Open No. 2001-31227 JP 2002-91749 A Japanese Patent Laid-Open No. 2002-300333 Japanese Patent Laid-Open No. 2003-22257 Japanese Patent Laid-Open No. 2002-24865

As described above, electronic paper can be used in the same way as paper. For example, image information can be displayed and held on a plurality of electronic papers for viewing and storage.
Here, when handling a plurality of sheets, punching holes are formed in a plurality of sheets and bound into a file, or a plurality of sheets are stapled and bundled into a bundle.

  However, the electronic paper has a display unit that can rewrite image information and a processing function unit necessary for display processing, etc. in order to realize a function superior to that of the paper. If punch holes are punched or stapled, the display unit and processing function unit may be damaged, and there is no method for easily bundling and fixing a plurality of electronic papers on the spot.

  An object of the present invention is to provide an electronic paper that allows a user to easily bundle and fix a plurality of electronic papers without causing any trouble in function.

  In the present invention, an engagement portion is formed in the electronic paper, and bundled with other electronic paper by the engagement of the engagement portion, thereby causing a problem in the function of the electronic paper by punching the electronic paper. Without incurring a situation, a plurality of electronic papers can be easily bundled and fixed.

For example, an engagement portion that forms at least one of a male shape and a female shape is formed on the electronic paper, and the engagement portion engages with another electronic paper having an engagement portion that forms the other shape. Let them bundle.
Note that such an engaging portion may be formed in advance on the electronic paper, or may be formed by stacking a plurality of electronic papers and pressing and deforming them. When forming the engaging portion, it is preferable to provide a reinforcing portion for preventing the bending of the electronic paper body between the portion where the engaging portion is formed and the electronic paper body.

Further, the engaging portion may be formed by a hook-and-loop fastener and bundled with other electronic paper by the engagement of the hook-and-loop fastener, or may be formed by a magnet and another electronic paper by magnetic engagement of the engaging portion. Or may be bundled with other electronic papers by adhesive engagement of the engaging portion.
Note that in such an engagement method, it is preferable to provide a positioning unit that positions the electronic paper in contact with another electronic paper, and a plurality of electronic papers can be aligned and bundled by positioning.

  Further, the engaging portion may be formed by a slit provided in the electronic paper and may be bundled with other electronic paper by insertion engagement into the slit, or by an elastic flange provided in the electronic paper. It may be formed and bundled with other electronic paper by engagement with the elastic restoring force of the buttocks, or other electronic paper may be formed by engaging with the belt formed on the electronic paper and sandwiched between the belts. It may be bundled with paper, or may be formed by stretching an elastic body provided on the electronic paper, and may be bundled with other electronic paper by engaging the stretched elastic body.

In addition, it is preferable to provide a flexible bent portion between the portion where the engaging portion is formed and the electronic paper main body, thereby making it easy to roll the bundled electronic paper, and further, the electronic paper during the turning operation. It is possible to prevent functional failure caused by excessive bending of the material.
In addition, it is preferable that the part that forms the engaging portion is detachably provided on the electronic paper body, so that it can be replaced when the engaging portion is damaged or removed when unnecessary. preferable.

  According to the present invention, since the engaging portion is formed in the electronic paper, the electronic paper can be easily bundled with other electronic paper without causing any trouble in function, and the use environment of the electronic paper is made more comfortable. The use of electronic paper can be promoted.

The present invention will be specifically described based on examples.
First, a basic configuration of an example of electronic paper to which the present invention is applied will be described with reference to FIGS.
The electronic paper EP is roughly classified according to the image recording method, and includes a self-writing type shown in FIGS. 15 to 17 and an optical writing type shown in FIGS. This is a thin device.

FIG. 15A shows the self-writing electronic paper EP as viewed from the front, and FIG. 15B shows the self-writing electronic paper EP as viewed from the side. The illustrated electronic paper EP includes a display unit 2 that displays and holds an image and a processing unit 3 that manages processing such as communication and display processing of indicator light data. FIG. Various functional parts are also shown.
The self-writing type electronic paper EP is a thin display device that is configured by using a resin or the like as large as, for example, A4 size paper, and the processing unit 3 is provided on one piece of the display unit 2 that occupies most of the area. Is provided.

The processing unit 3 includes a driver 4 that drives the display unit 2, a communication unit 5 for communicating with the outside, a memory 6 that holds electronic data in a readable and writable manner, a processor 7 that performs various processes, a communication unit 5 and a processor 7 A battery 8 for supplying driving power such as a button, and an operation unit 9 such as a button for receiving a user operation input such as an instruction for image display are provided.
The self-writing type electronic paper EP transmits / receives electronic data (image data or the like) stored in the memory 6 by communicating with an apparatus having an external communication function through the communication unit 5, and these electronic data are transferred to the memory 6. Can be held.

Further, the self-writing type electronic paper EP allows the driver 4 to write an image on the display unit 2 based on the data held in the memory 6, and image information is displayed on the display unit 2 even if the driving power of the driver 4 is removed. Has a function of continuously holding in the display state.
As shown in FIG. 17 showing the cross-sectional structure of the display unit 2, the self-writing type electronic paper EP has fine colored particles (white particles 11 and black particles 12 in the illustrated example) used as toner in the copying machine. Is sealed between a pair of front and back electrodes 13 whose surface side is transparent, and is sandwiched between a pair of front and back film substrates 14 whose surface side is transparent. An air layer is formed between the electrode layers 13 so that the colored particles 11 and 12 can freely move, and an insulating layer 15 for preventing contact with the colored particles 11 and 12 is provided on the matrix electrode layer 13. It has been. Note that a color display can be realized with a simple structure by using a color filter.

  The self-writing type electronic paper EP is in a state in which no voltage is applied to the electrode 13 as shown in FIG. 16 showing the operation principle of the display unit 2 (however, the electrode 13 is charged to the polarity at the previous driving). The negatively charged white particles 11 accumulate on the back side, while the positively charged black particles 12 accumulate on the front side. When the display unit 2 is viewed from the front side, the display unit 2 is observed. Becomes a black state. And if the electrode polarity of the required part of the matrix according to the image information displayed by the operation of the driver 4 based on the data stored in the memory 6 is reversed, the positional relationship between the white particles 11 and the black particles 12 is switched. Thus, image information based on the contrast between the white particles 11 and the black particles 12 is displayed on the display unit 2. Note that by operating the driver 4 based on different data, the image information displayed on the display unit 2 can be switched depending on the contrast between the white particles 11 and the black particles 12, and can be reused many times.

The optical writable electronic paper EP is a thin device formed of a base material such as resin having a size similar to, for example, A4 size paper.
For example, as shown in FIG. 18, the optical writable electronic paper EP displays image information on the liquid crystal panel 1, and the optical writable electronic paper EP is superimposed on the liquid crystal panel 1 while applying a voltage to the electrode 10 from an external power source. By irradiating light, the image information displayed on the liquid crystal panel 1 can be transferred to the display unit 2 and displayed and held.
That is, the optical writable electronic paper EP transfers a projected image to the display unit 2 by applying a voltage to the electrode 10 and continues to hold the image in a display state even after the voltage applied to the electrode 10 is removed. It has a function.

  The optical writable electronic paper EP includes an organic photoconductive material layer (organic photoconductive layer) 20 and a liquid crystal display material layer used in a copying machine, as shown in FIG. (Microencapsulated cholesteric liquid crystal layer) 21 is combined, these layers are sandwiched between a pair of front and back transparent electrodes 22, and this laminate is sandwiched between a pair of front and back transparent substrate films 23. In this configuration, the white display in which the cholesteric liquid crystal layer 21 reflects light and the light is transmitted through the liquid crystal layer 21 and absorbed by the black layer 24 provided between the cholesteric liquid crystal layer 21 and the organic photoconductive layer 20. Black display monochrome image display is possible. Furthermore, since the cholesteric liquid crystal has a characteristic of interference-reflecting color light according to the helical pitch, color display can be realized with a simple structure by forming the cholesteric liquid crystal layer 21 by laminating liquid crystals having different helical pitches. It is also possible.

  The optical writable electronic paper EP displays an image transferred to, for example, a light control element panel (light emitting panel) 1 for image writing and displays the display unit 2 as shown in FIG. When the voltage is applied to the electrode 10, the intensity of light is instantaneously converted to the reflection density and the projection image is held. The optical writable electronic paper EP can be reused many times by repeating writing and erasing.

Note that the present invention can also be applied to electronic papers other than formats such as self-writing type electronic paper and optical writing type electronic paper. For example, the electronic paper can be loaded into an external rewriting device and the display unit can be self-writing type. The image information may be written electronically. That is, the self-writing electronic paper is an example of an electronic paper that does not require an external image writing device, and the optical writing electronic paper is an example of an electronic paper that requires an external image writing device. .
In addition, as the display unit 2 of the electronic paper EP, a liquid crystal having a memory property represented by a ferroelectric liquid crystal, an electrophoretic method in which charged particles are moved to switch a display, and rotating charged particles for display. A particle rotation method for switching the display, a magnetophoresis method for switching display by moving particles by magnetism, a small battery-driven thin liquid crystal or an EL element may be used.

FIG. 1 shows an example of an electronic paper EP according to the present invention as viewed from the front.
The electronic paper EP shown in FIG. 1A is provided with two engaging portions 30 on the left side of the edge portion, and similarly engages other electronic papers provided with engaging portions with each other. It can be bundled and fixed.
The electronic paper EP shown in FIG. 1 (b) is bundled by providing an engagement portion 30 at the left corner of the edge and engaging the other electronic paper with the engagement portion in the same manner. Can be fixed.

As shown in FIG. 2A, which is a cross section taken along the line AA of FIG. 1, the engaging portion 30 has a male shape on one surface side and a female shape on the other surface side. It is formed in the part 31 where the part 2 and the processing part 3 are not present.
Therefore, as shown in FIG. 2B, the electronic paper EP can be bundled and fixed by engaging the male engaging portion 30 and the female engaging portion 30 of the two electronic paper EPs. In addition, by engaging other electronic papers in the same manner, several electronic papers EP can be bundled and fixed.
In order to increase the engagement fixing force, the engagement portion 30 preferably has elasticity. Moreover, you may form any one of the male type engaging part 30 and the female type engaging part 30 in the electronic paper used as the uppermost layer or the lowest layer when bundled.

In this example, as shown in FIG. 2, a notch 32 extends between a portion 31 that forms the engaging portion and the main body of the electronic paper EP (that is, the portion on the display portion 2 or processing portion 3 side). The bent portion is formed so as to be easily bent at the bent portion 32 when the main body of the electronic paper EP is turned with the engaging portion 30 engaged and bundled.
Therefore, even if the electronic paper EP in which a plurality of sheets are bundled is turned, the electronic paper main body is not bent excessively, and stress that causes a failure in the display unit 2 and the processing unit 3 is not applied.

  The bent portion 32 can be formed by other methods as long as it can be easily bent. For example, as shown in FIG. 3 which is a cross section taken along the line A-A in FIG. EP may be connected by a material 32 having flexibility, and a bent portion may be extended between the portion 31 where the engaging portion 30 is formed and the electronic paper main body.

Thus, when the part 31 which forms an engaging part is comprised with a member different from electronic paper EP, and the part 31 is attached to electronic paper EP by arbitrary methods, the said part 31 differs from electronic paper EP. Can be formed from Thereby, irrespective of the material of the electronic paper EP, in order to give the engaging portion 30 elasticity as described above, the portion 31 forming the engaging portion can be formed of an elastic material such as hard rubber or urethane. In addition, as described later, it can be made of a material that is plastically deformed by pressing.
In the present invention, the bent portion 32 is not essential, but the flexibility of the turning operation can be provided by using a material that allows flexibility in the portion 31 that forms the engaging portion without providing the bent portion 32. it can.

FIG. 4 shows another example of the electronic paper EP according to the present invention. FIG. 4 (a) shows a state before engagement, and FIG. 4 (b) shows a state after engagement.
In this example, one electronic paper EP is provided with a metal pin 30 as a male engaging portion, and the other electronic paper EP is provided with a hole through which the metal pin 30 penetrates as a female engaging portion. Yes.
Therefore, these electronic papers EP can be bundled and fixed by penetrating the metal pins 30 through the holes 30, overlapping the electronic papers EP, and caulking the tips of the metal pins 30.
In this example, the paper P can be sandwiched between the electronic papers EP, and these can be bundled and fixed.

FIG. 5 (a) shows another example of the electronic paper EP according to the present invention when viewed from the front, and FIG. 5 (b) shows an AA cross section thereof.
In the electronic paper EP of this example, the part 31 that forms the engaging portion is provided so as to extend all around the edge of the electronic paper EP, and the electronic paper main body including the display unit 2 and the processing unit 3 and the part 31. A reinforcing part 35 is provided between the two.

The reinforcing portion 35 of this example is formed of a thick rib-like portion, which makes the rigidity higher than other portions.
In this example, as shown in FIG. 6, the portion 31 that forms the engaging portion is pressed to form the engaging portion 30, and a force that causes bending due to pressing is applied to the portion 31. The electronic paper main body is prevented from being bent by the reinforcing portion 35, and stress that causes a failure in the display portion 2 and the processing portion 3 does not occur.

The reinforcing portion 35 may be formed by a method of extending a highly rigid material such as metal, and the portion 31 where the engaging portion is formed is a separate member from the electronic paper EP as shown in FIG. When forming and attaching to electronic paper, you may form by attaching the site | part 31 to the electronic paper EP through interposing a highly rigid material.
Further, the reinforcing portion 35 may not be provided on the entire circumference, and may be provided so as to partition at least the portion 31 provided at various positions such as one side or one corner of the electronic paper EP and the electronic paper main body.
Further, the bent portion 32 may be provided.

  Therefore, in this example, as shown in FIG. 6 (a), as shown in FIG. 6 (b), as shown in FIG. The parts 31 are plastically deformed by the male mold 36a and the female mold 36b of the mold pressing scissors 36 to form an engaging portion 30 in an engaged state, and the electronic paper EP is bundled and fixed.

Here, as shown in FIG. 7, the part 31 which forms an engaging part is formed in another member, and the surface fastener 38 is provided in the said part 31 and the edge part of electronic paper EP, respectively, These surface fastener 38 The part 31 may be detachably attached to the edge of the electronic paper EP by the engagement. In addition to the hook-and-loop fastener, a magnet, an adhesive tape, or the like can be used.
With this configuration, the portion 31 that forms the engaging portion can be removed from the electronic paper EP. Therefore, the portion 31 that forms the engaging portion can be replaced with a new one or removed when unnecessary. be able to.
Such a configuration that can be exchanged with the new portion 31 is particularly effective when forming the engaging portion 30 that is not very elastic and cannot be re-engaged after being disengaged.

  Various methods can be used for the engagement and fixing by the engagement portion 30. For example, as shown in FIG. 8A, a plurality of electronic paper EPs each having a recess-shaped engagement portion 30 formed thereon are stacked. As shown in FIG. 2B, a plurality of electronic papers EP may be bundled and fixed by engaging a C-shaped clip 39 with these engaging portions 30.

FIG. 9A shows another example of the electronic paper EP according to the present invention as viewed from the front, and FIG. 9B shows the AA cross section in a state where two electronic papers EP are bundled. It is.
In the electronic paper EP of this example, the surface fastener 40 is provided in the part 31 that forms the engaging portion to constitute the engaging portion 30, and the electronic paper EP is bundled by engaging the surface fasteners 40 with each other. Yes.

In addition, it replaces with the hook_and_loop | surface fastener 40, the magnet is provided, the engaging part 30 may be comprised, and several electronic paper EP may be bundled by the engagement by the magnetic force between magnets, and an adhesive material is provided and an engaging part 30, and a plurality of electronic papers EP may be bundled by engagement by the adhesive force of the adhesive material.
In addition, as shown in FIG. 10, it is preferable to provide positioning pins 41 that are in alignment with and contact with other electronic paper on the electronic paper EP, and it is difficult to perform alignment because the positional relationship for engagement is free. A plurality of electronic papers EP can be bundled together by engagement with a hook-and-loop fastener, a magnet, and an adhesive material.

FIG. 11A shows another example of the electronic paper EP according to the present invention as viewed from the front, and FIG. 11B shows a state in which two electronic papers EP are bundled.
In the electronic paper EP of this example, slits 42 are provided at the corners to form the engaging portion 30, and the corners of the other electronic paper EP are inserted into the slits 42 of one electronic paper EP and engaged. Thus, the electronic paper EP is bundled.
Note that the slit 42 may be provided in at least one of the electronic papers EP, and a sheet can be inserted into the slit 42 and bundled.

FIG. 12A shows another example of the electronic paper EP according to the present invention before engagement, and FIG. 12B shows the state after engagement.
In the electronic paper EP of this example, the hook part 43 having elasticity is provided at the side part or the corner part to constitute the engaging part 30, and the other electronic paper EP and the paper P are attached by the elastic restoring force of the hook part 43. The electronic paper EP and the other electronic paper EP or paper P are bundled by being engaged in a state of being sandwiched.

FIG. 13 (a) shows another example of the electronic paper EP according to the present invention when viewed from the front, FIG. 13 (b) shows the main part after engagement, and FIG. A view of arrow A in FIG.
In the electronic paper EP of this example, an elastic band 44 is provided at the corner of the diagonal position to configure the engaging portion 30, and the other electronic paper EP or paper P is held in a state of being sandwiched by the band 44. Thus, the electronic paper EP is bundled with another electronic paper EP or paper P.
One or more bands 44 can be provided at any position on the edge, for example, at the four corners or at one side.

FIG. 14A shows another example of the electronic paper EP according to the present invention when viewed from the front, and FIG. 14B shows a main part in a state where the engaging part 30 is extended.
In the electronic paper EP of this example, the engaging portion 30 made of the elastic body 45 is provided at the side portion or the corner portion, and the flat elastic body 45 is usually picked and extended, and this is provided on, for example, another electronic paper. The electronic paper EP is bundled with other electronic paper or paper by hooking on a hook or a hook provided in a file book.

It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows the cross-section of the electronic paper which concerns on an example of this invention. It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows the electronic paper which concerns on an example of this invention. It is a figure which shows self-rewritable electronic paper. It is a figure explaining the principle of operation of self-rewriting type electronic paper. It is a figure explaining the structure of self-rewritable electronic paper. It is a figure which shows optical writing type electronic paper. It is a figure explaining the principle of operation of optical writing type electronic paper. It is a figure explaining the structure of optical writing type electronic paper.

Explanation of symbols

EP: electronic paper, P: paper,
2: display unit, 3: processing unit,
30: engagement part, 31: site | part which forms an engagement part,
32: bent part, 35: reinforcing part,
36: Pressed scissors, 36a: Male
36b: female mold, 38: hook-and-loop fastener,
40: hook-and-loop fastener (magnet, adhesive), 41: positioning pin,
42: slit, 43: buttocks,
44: Band, 45: Elastic material,

Claims (14)

  An electronic paper, wherein an engaging portion is formed on the electronic paper, and the electronic paper can be bundled with other electronic paper by the engagement of the engaging portion. The electronic paper according to claim 1,
The electronic paper is formed with an engaging portion that forms at least one of a male shape and a female shape, and the other electronic paper having an engaging portion that forms the other shape is engaged with the engaging portions. Electronic paper characterized by being bundled. The electronic paper according to claim 2,
The electronic paper is characterized in that the engaging portion is formed by stacking a plurality of electronic papers and pressing and deforming them. The electronic paper according to claim 4,
An electronic paper, wherein a reinforcing portion for preventing the bending of the electronic paper main body is provided between a portion forming the engaging portion and the electronic paper main body. The electronic paper according to claim 1,
An electronic paper characterized in that the engaging portion is formed by a hook-and-loop fastener and can be bundled with other electronic paper by the engagement of the hook-and-loop fastener. The electronic paper according to claim 1,
An electronic paper characterized in that the engaging portion is formed of a magnet and can be bundled with other electronic paper by magnetic engagement of the engaging portion. The electronic paper according to claim 1,
An electronic paper, wherein the engaging portion is formed of an adhesive material and can be bundled with other electronic paper by the adhesive engagement of the engaging portion. The electronic paper according to any one of claims 5 to 7,
The electronic paper has a positioning portion that contacts and positions other electronic paper. The electronic paper according to claim 1,
The electronic paper is characterized in that the engaging portion is formed by a slit provided in the electronic paper and can be bundled with other electronic paper by insertion engagement into the slit. The electronic paper according to claim 1,
The electronic paper is characterized in that the engaging portion is formed by a collar portion having elasticity provided in the electronic paper, and can be bundled with other electronic paper by the engagement of the collar portion with an elastic restoring force. The electronic paper according to claim 1,
The electronic paper is characterized in that the engaging portion is formed by a belt provided on the electronic paper, and can be bundled with other electronic paper by being sandwiched and engaged with the belt. The electronic paper according to claim 1,
The electronic paper is characterized in that the engaging portion is formed by extending an elastic body provided on the electronic paper, and can be bundled with another electronic paper by engaging the extended elastic body. The electronic paper according to any one of claims 1 to 2,
An electronic paper characterized in that a flexible bent portion is provided between a portion forming the engaging portion and the electronic paper main body. The electronic paper according to any one of claims 1 to 13,
The electronic paper is characterized in that a portion forming the engaging portion is detachably provided on the electronic paper main body.

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