JP2008089820A - Electrophoresis display medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophoresis display medium capable of suppressing deterioration of display quality by the influence of resident charged particles. <P>SOLUTION: A partition member 5 is movably disposed in a liquid chamber R and when external force is applied to the electrophoresis display medium 10, the partition member 5 is moved in the liquid chamber by the influence thereof. The resident charged particles 31 are separated from a wall surface of the partition member 5 and a corner part of a cell C by vibration generated by movement of the partition member 5 and black charged particles 31b and white charged particles 31a are moved to a first substrate 12 side and a second substrate 13 side, respectively. Thereby, deterioration of display quality by the influence of the resident charged particles 31 can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrophoretic display medium, and more particularly to an electrophoretic display medium capable of suppressing display quality from being deteriorated by the influence of staying charged particles.

2. Description of the Related Art Conventionally, an electrophoretic display medium that displays an image using charged particles that are positively or negatively charged is known. An electrophoretic display medium is a medium in which charged particles in a display liquid can be migrated for each pixel by applying a voltage to each pixel by an electrode installed on a substrate. With respect to this type of electrophoretic display medium, the following Patent Documents 1 and 2 divide a space between a display substrate having electrodes and a back substrate into a plurality of cells by a partition member, and display in each cell. An electrophoretic display medium configured by filling a liquid is disclosed. Thus, by dividing the space between the pair of substrates into a plurality of cells by the partition member, the charged particles filled in one cell are suppressed from moving to other cells, and the bias of charged particles is It is possible to suppress the deterioration in display quality that occurs.
JP 59-034518 JP 59-171930 A

  However, in the electrophoretic display medium provided with the partition member as disclosed in Patent Documents 1 and 2, even when a voltage is applied, the wall surface of the partition member or the substrate and the partition member are formed in close contact with each other. In some cases, the charged particles may not move while attached to the corners of each space. As described above, when charged particles stay on the wall surface of the partition wall member or the corners of each space, the staying charged particles are displayed as an image on the display surface, and there is a problem that display quality deteriorates.

  The present invention has been made to solve the above-described problem, and an object thereof is to provide an electrophoretic display medium capable of suppressing display quality from being deteriorated due to the influence of staying charged particles.

  To achieve this object, an electrophoretic display medium according to claim 1 includes a pair of first substrate and second substrate having substrate surfaces facing each other, and each substrate of the first substrate and the second substrate. A frame member that maintains a predetermined distance between the surfaces, a partition member that is surrounded by the frame member, the interior of which is divided into a plurality of cells and is erected in the thickness direction of the first substrate or the second substrate, and the first member A display liquid that is sealed between the substrate and the second substrate and in which charged particles that move according to the direction of electrolysis are dispersed, and the first substrate or the second substrate varies depending on the position of the charged particles. In the electrophoretic display medium that displays characters and images on a display surface configured by at least one of the substrates, the partition member is in a space surrounded by the first substrate, the second substrate, and the frame member. Is installed movably

  The electrophoretic display medium according to claim 2 is the electrophoretic display medium according to claim 1, wherein the partition member is installed in a non-fixed state with each of the first substrate, the second substrate, and the frame member. A gap is provided between each of the first substrate, the second substrate, and the frame member.

  The electrophoretic display medium according to claim 3 is the electrophoretic display medium according to claim 2, wherein, of the gaps, a gap between the partition member and the first substrate or the partition member and the second substrate. The gap between them is formed at an interval at which the charged particles cannot pass.

  An electrophoretic display medium according to claim 4 is the electrophoretic display medium according to any one of claims 1 to 3, wherein the external force applied to the partition member is filled in a gap between the partition member and the frame member. A buffer body is provided for buffering.

  The electrophoretic display medium according to claim 5 is the electrophoretic display medium according to claim 4, wherein the buffer has immiscibility that does not mix with the display liquid and viscosity that can buffer external force applied to the partition member. Or a solid body having elasticity capable of buffering an external force applied to the partition member.

  According to the electrophoretic display medium of the first aspect, since the partition member is movably installed in the space surrounded by the first substrate, the second substrate, and the frame member, the partition member moves. The charged particles staying attached to the wall surface of the partition wall member and the corner portion of the cell are separated from the wall surface of the partition wall member and the corner portion of the cell by the vibration caused by the above. Therefore, there is an effect that it is possible to suppress the display quality from being deteriorated by the influence of the staying charged particles.

  According to the electrophoretic display medium of the second aspect, in addition to the effect exhibited by the electrophoretic display medium of the first aspect, the partition member has a gap between the first substrate and the second substrate and between the frame member. The first substrate, the second substrate, and each of the frame members are installed in a non-fixed state. Therefore, there is an effect that the partition wall member can be easily movably installed in the space surrounded by the first substrate, the second substrate, and the frame member.

  According to the electrophoretic display medium according to claim 3, in addition to the effect exhibited by the electrophoretic display medium according to claim 2, the gap between the partition wall member and the first substrate or the gap between the second substrate is: Since the charged particles are formed at intervals through which the charged particles cannot pass, the charged particles filled in each cell are prevented from moving to another cell. Therefore, there is an effect that it is possible to suppress a decrease in display quality caused by uneven density of charged particles filled in each cell.

  According to the electrophoretic display medium of claim 4, in addition to the effect exhibited by the electrophoretic display medium according to any of claims 1 to 3, the gap between the partition wall member and the frame member is provided in the partition wall member. A shock absorber for buffering the applied external force is provided. Therefore, even if an external force is applied to the electrophoretic display medium and the partition member moves in the liquid chamber due to the external force, the partition member does not directly collide with the frame member, but the partition member collides with the shock absorber and the impact Is absorbed by the buffer body, so that the partition member 5 can be prevented from being damaged.

  According to the electrophoretic display medium of claim 5, in addition to the effects exhibited by the electrophoretic display medium of claim 4, the buffer has immiscibility and resistance that are immiscible with the display liquid, and further has an external force. Since it is made of a liquid or gel-like body having a viscosity capable of buffering, there is an effect that it can be easily injected into the gap between the partition wall member and the frame member during manufacturing. In addition, because it is composed of a solid with elasticity that can buffer the external force applied to the partition member, the rate of change in properties such as viscosity due to environmental factors such as temperature is less than gas or liquid, and stable There is an effect that the buffering force can be exhibited.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an electrophoretic display medium 10 and a display device 1 according to the present invention. FIG. 1A is a perspective view of the entire display device 1 that displays an image on the electrophoretic display medium 10. FIG. 1B is an exploded perspective view schematically showing the structure of the electrophoretic display medium 10.

  As shown in FIG. 1A, the display device 1 is a device that includes an electrophoretic display medium 10 and a main body 20, and performs a predetermined operation after the electrophoretic display medium 10 is disposed on the main body 20. Thus, an image can be displayed on the electrophoretic display medium 10.

  The main body 20 includes a base plate 25 formed in a rectangular shape that is slightly larger than the size of the electrophoretic display medium 10, and a frame body 26 attached along the periphery of the base plate 25. The frame body 26 is provided around the base plate 25 so that a part thereof (the left side of the base plate 25 in FIG. 1A) is opened. By providing the frame body 26 with a part opened, the user can easily insert the electrophoretic display medium 10 into the display device 1 and take out the electrophoretic display medium 10 from the display device 1. . The frame 26 has a drive control unit (see FIG. 1) for controlling an electric signal (waveform) applied to the X electrode 12a and the Y electrode 13a (both see FIG. 1B) provided in the electrophoretic display medium 10. Not shown).

  A power switch 26a and operation buttons 26b are provided on the surface of the frame body 26. The power switch 26a is managed by a CPU included in the drive control unit. When the CPU detects that the power switch 26a has been pressed, the power of the main body 20 is turned on or off. The operation button 26b is a button operated by the user in order to display an image on the electrophoretic display medium 10.

  When the electrophoretic display medium 10 is inserted into the display device 1 and disposed at a predetermined position on the base plate 25, the drive control in which the X electrode 12 a and the Y electrode 13 a of the electrophoretic display medium 10 are included in the frame body 26. Connected to the unit. When the user operates the operation button 26b, the X electrode 12a and the Y electrode 13a are controlled by the drive control unit, and a desired image can be displayed on the electrophoretic display medium 10.

  As shown in FIG. 1B, the electrophoretic display medium 10 includes a transparent first substrate 12 that constitutes a display surface, a second substrate 13, and a space between the second substrate 13 and the first substrate 12. The grid-shaped partition wall member 5 installed and the frame member 17 surrounding the periphery of the partition wall member 5 are mainly provided, and these are laminated.

  The first substrate 12 and the second substrate 13 both have a thickness of 10 μm or more and 1000 μm or less, and examples of the material thereof include glass, synthetic resin, natural resin, and paper. A preferable material of the first substrate 12 and the second substrate 13 is a synthetic resin exhibiting flexibility, for example, a polyester resin such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polyphenylene sulfide (PPS), Examples include aramid, polyimide, nylon, polypropylene, and hard polyethylene (high density polyethylene). Among these synthetic resins, polyethylene terephthalate, polyethylene naphthalate, and polyphenylene sulfide are particularly preferable materials in terms of transparency, strength, and heat resistance, and the most preferable material is polyethylene terephthalate. By using a material having flexibility as described above as the first substrate 12 and the second substrate 13, the entire electrophoretic display medium 10 can be configured to exhibit flexibility.

  The first substrate 12 and the second substrate 13 are each provided with an X electrode 12a and a Y electrode 13a on surfaces facing each other in the electrophoretic display medium 10. Both the X electrode 12a and the Y electrode 13a are formed in a plurality of substantially parallel lines. Further, the X electrode 12 a and the Y electrode 13 a are configured to be substantially orthogonal to each other in the electrophoretic display medium 10. These intersections apply an electric field to the display liquid 33 (see FIG. 2) by an electric signal applied to the X electrode 12a and the Y electrode 13a at a predetermined timing. The intersecting portion becomes one pixel, and an arbitrary image is displayed by the color of the charged particles 31 moved to the display surface side in a pixel unit.

  As long as both the X electrode 12a and the Y electrode 13a have conductivity, the material is not particularly limited, and the material is not limited to metal, semiconductor, conductive resin, conductive paint, conductive ink, inorganic transparent conductor, and the like. It is comprised by the material of. The X electrode 12a and the Y electrode 13a are formed on the first substrate 12 and the second substrate 13, respectively, using the above-described materials by a known electroless plating method, sputtering method, vapor deposition method, ink jet method, or the like. Can be formed. In particular, when the material of the first substrate 12 and the second substrate 13 is a flexible synthetic resin, the substrate (by the inkjet method using an ink containing a conductive polymer such as a polythiophene-based conductive polymer) is used. The X electrode 12a and the Y electrode 13a can be easily formed without damaging the first substrate 12 and the second substrate 13).

  The frame member 17 is made of the synthetic resin, natural resin, ceramics, glass, or the like listed above as the material of the first substrate 12 and the second substrate 13, and an opening 17a is opened at the center thereof. The partition member 5 is disposed inside the opening 17a. The thickness of the frame member 17 is about 50 μm.

  The partition member 5 is a lattice-like plate-like member having a large number of holes 5 a, has a thickness of 45 μm or more and less than 50 μm, and is formed lower than the frame member 17. The partition member 5 is formed in a rectangular shape in plan view, and its size is slightly smaller than the opening 17 a of the frame member 17. Therefore, the frame member 17 is fixed on the second substrate 13, the partition member 13 is placed in the opening 17 a of the frame member 17, and the first substrate 12 is attached to the frame member 17 so as to cover the opening 17 a of the frame member 17. When fixed to 17, gaps are formed between the first substrate 12 and the partition member 5, and between the partition member 5 and the frame member 17.

  Although details will be described later with reference to FIG. 2, the partition wall member 5 and the frame member 17 are installed between the first substrate 12 and the second substrate 13, and a plurality of cells C are formed by the partition wall member 5 therebetween. Divided. Each cell C is filled with a display liquid 33 including charged particles 31, and a buffer 6 is filled in a gap between the partition wall member 5 and the frame member 17.

  The structure of the electrophoretic display medium 10 will be described more specifically with reference to FIG. FIG. 2 is a schematic cross-sectional view of the electrophoretic display medium 10. 2 passes through one of the X electrodes 12a formed on the first substrate 12 and is substantially orthogonal to each of the Y electrodes 13a formed on the second substrate. The cross section at the time of cut | disconnecting by a cutting line is illustrated. In order to facilitate understanding with the drawings, in FIG. 2, the substrates 12 and 13, the electrodes 12 a and 13 a, the partition member 5, the buffer body 6, the frame member 17, and the charged particles 31 are schematically illustrated. The relative ratios of the thicknesses of the respective members are shown by ignoring actual ones.

  The partition member 5 is not fixed to the first substrate 12, the second substrate 13, and the frame member 17 in a space (liquid chamber R) surrounded by the first substrate 12, the second substrate 13, and the frame member 17. Arranged in a state. That is, the partition member 5 is disposed so as to be movable in the liquid chamber R. Further, the liquid chamber R is divided into a plurality of cells C by the partition member 5, and each cell C includes a display liquid 33 including charged particles 31 that are positively or negatively charged and an electrophoretic medium 32 that is a dispersion medium. Is filled.

  The charged particles 31 are granular having a diameter of about 5 μm, and are composed of white charged white particles 31 a that are positively charged and black black charged particles 31 b that are negatively charged. As the white charged particles 31a and the black charged particles 31b, surface treatment for forming a fluorine-based monomolecular film on the surface of an organic pigment such as hydrophobized white titanium oxide or black carbon black or a phthalocyanine pigment is used. Those having a hydrophobic property by applying them, and those having a hydrophobic property by treating the surface of the organic pigment with a silane coupling agent are used.

  The white charged particles 31a and the black charged particles 31b are respectively provided on the first substrate 12 side according to the electric field generated between the X electrode 12a and the Y electrode 13a for each pixel in the electrophoretic display medium 10. Alternatively, it migrates to the second substrate 13 side.

  More specifically, in one pixel, when a recording voltage is applied and an electric field is generated so that the X electrode 12a is positive with respect to the Y electrode 13a, the black charged particles are negatively charged. 31b migrates to the first substrate 12 side (X electrode 12a side), while the positively charged white charged particles 31a migrate to the second substrate 13 side (X electrode 13a side). In this case, the user visually recognizes that the pixel is displayed in black on the display surface constituted by the first substrate 12. In the following, the state of a pixel that is visually recognized as black when the user visually recognizes the display surface is referred to as a “display state”.

  On the other hand, in one pixel, when a recording voltage is applied and an electric field is generated so that the X electrode 12a is negative with respect to the Y electrode 13a, the positively charged white charged particles 31a are: On the other hand, the negatively charged black charged particles 31b migrate to the first substrate 12 side (X electrode 12a side), and migrate to the second substrate 13 side (Y electrode 13a side). In this case, the user visually recognizes that the pixel is displayed in white on the display surface constituted by the first substrate 12.

  Further, since the diameter of the charged particles 31 is about 5 μm and the gap formed between the partition member 5 and the first substrate 12 is less than 5 μm, the charged particles 31 cannot pass through the gap. Therefore, it is possible to suppress a decrease in display quality caused by the uneven density of the charged particles 31 filled in each cell C.

  The electrophoretic medium 32 in which the charged particles 31 are dispersed is preferably a nonpolar solvent having high electrical resistance (high insulation), and preferred solvents include, for example, aromatic hydrocarbon solvents (for example, benzene, toluene, Xylene), aliphatic hydrocarbon solvents (eg, linear or cyclic paraffin hydrocarbon solvents such as hexane, cyclohexane, isoparaffin hydrocarbon solvents, kerosene, etc.), halogenated hydrocarbon solvents (eg, chloroform, trichloroethylene, dichloromethane) , Trichlorotrifluoroethylene, ethyl bromide, etc.), oily polysiloxanes such as silicone oil, and high-purity petroleum. In this embodiment, an isoparaffinic hydrocarbon solvent is used. In addition, the electrophoretic display medium 10 may use each of the above solvents alone or as a mixture of two or more.

  The gap formed between the partition member 5 and the frame member 17 is filled with a buffer body 6. As the buffer body 6, a liquid or gel body having immiscibility that is immiscible with the electrophoresis medium 32 and viscosity capable of buffering an external force applied to the partition member 5 can be used. Alternatively, an individual having resistance to the electrophoretic medium 32 and elasticity capable of buffering an external force applied to the partition member 5 can be used.

  Specifically, when the electrophoretic medium 32 is an aromatic hydrocarbon solvent, ethylene glycol, glycerin, polyethylene glycol are used for liquids or gels, and fluororubber, fluorosilicone rubber, nitrile rubber, etc. are used for solids. Can be used. When the electrophoretic medium 32 is an aliphatic hydrocarbon solvent, ethylene glycol, glycerin, polyethylene glycol can be used if it is liquid or gel, and fluororubber or fluorosilicone rubber can be used if it is solid. When the electrophoretic medium 32 is silicone oil, ethylene glycol, glycerin, polyethylene glycol can be used if it is liquid or gel, and chloroprene rubber, natural rubber, fluororubber, etc. can be used if it is solid. In this embodiment, glycerin is used. In addition, the electrophoretic display medium 10 may use each electrophoretic medium 32 as described above alone or as a mixture of two or more.

  Even if an external force is applied to the electrophoretic display medium 10 by the buffer 6 and the partition member 5 moves in the liquid chamber R due to the external force, the partition member 5 does not directly collide with the frame member 17. Since the member 5 collides with the buffer body and the impact is absorbed by the buffer body 6, the partition member 5 can be prevented from being damaged.

  According to the display device 1 configured as described above, when the electrophoretic display medium 10 is attached to the main body 20, the polarities of the X electrode 12a and the Y electrode 13a are controlled by the drive control unit for each pixel unit. Thus, the display state and non-display state of each pixel in the electrophoretic display medium 10 are electrically switched. As a result, the electrophoretic display medium 10 can display an image according to image data input from an external device via a connector (not shown), or can erase the displayed image.

  Moreover, according to the electrophoretic display medium 10, even after the application of voltage to the X electrode 12a and the Y electrode 13a is finished and the electric field between the X electrode 12a and the Y electrode 13a is lost, Since the charged particles 31 attached to the X electrode 12a and the Y electrode 13a continue to adhere to the respective electrodes due to their own charging characteristics, the image display state is maintained (so-called memory effect).

  Next, the operation of the electrophoretic display medium 10 described above will be described with reference to FIG. 3A is an enlarged cross-sectional view showing one cell C in the cross-sectional view shown in FIG. 2, and FIG. 3B is a cross-sectional view of the partition member 5 shown in FIG. It is a figure which shows the state which moved to the direction. 3A and 3B, it is assumed that a voltage is applied so that the black charged particles 31b move to the first substrate 12 side and the white charged particles 31a move to the second substrate 13 side.

  When a voltage is applied so that the black charged particles 31b move to the first substrate 12 side and the white charged particles 31a move to the second substrate 13 side, all of the black charged particles 31b are originally the first substrate 12. In other words, all of the white charged particles 31a move to the second substrate 13 side. However, when the partition member 5 is present between the first substrate 12 and the second substrate 13, as shown in FIG. 3A, a part of the black charged particles 31b (in the L region in the figure). And a part of the white charged particles 31a (refer to the region H in the drawing) may adhere to and stay on the wall surface of the partition wall member 5 or the corner of the cell C.

  As described above, when the charged particles 31 stay, black is originally displayed from the first substrate 12 side. However, a part of the remaining white charged particles 31a (refer to the area H in the figure) causes the pixel to appear. Some are displayed in white. Further, the density of the black charged particles 31b on the first substrate 12 side is reduced by a part of the staying black charged particles 31b (refer to the L region in the drawing), and as a result, the display quality is deteriorated.

  In such a case, an external force is applied to the electrophoretic display medium 10 from the outside. When an external force is applied to the electrophoretic display medium 10, the partition member 5 moves in the liquid chamber R due to the influence, and moves in the direction of arrow A as shown in FIG. 3B, for example. Then, the charged particles 31 staying away from the wall surface of the partition member 5 and the corners of the cell C due to vibration generated by the movement of the partition member 5, and the black charged particles 31 b are white on the first substrate 12 side. The charged particles 31a move to the second substrate 13 side. Therefore, it is possible to suppress the display quality from being deteriorated by the influence of the charged particles 31 that stay.

  Next, an example of a method for producing the electrophoretic display medium 10 of the present invention will be described with reference to FIGS. 4 and 5 are diagrams showing the manufacturing process of the electrophoretic display medium 10. Each of FIGS. 4 and 5A to 5F is a plan view on the left side and a plan view on the right side. Sectional drawing in -I 'sectional line is shown.

  FIG. 4A illustrates an example of the substrate preparation process. In the substrate preparation step, the first substrate 12 and the second substrate 13 are prepared, and electrodes 12a and 13a (not shown) are formed on the respective substrates. FIG. 4B is a diagram for explaining an example of the frame member forming step. In the frame member forming step, the frame member 17 is formed on the electrode forming surface of the second substrate by a photolithography method or the like.

  The photolithography method is a technique that is often used in the production of semiconductor devices, and is a known technique for forming a circuit pattern on a flat substrate using light (mainly ultraviolet rays). First, the material of the frame member 17 to be formed on the second substrate 13 is formed in a uniform layer with the height of the frame to be formed as the thickness. Next, a photosensitive material called a resist is uniformly applied thereon. There are two types of resists: positive resists and negative resists. In the case of positive resists, the portions exposed by light, and in the case of negative resists, the portions not exposed to light dissolve when immersed in a developer. In general, since a positive resist with high light sensitivity is used, the description will be made using the positive resist here.

  Next, an original plate made of glass or film called a mask is placed on top of the resist. The mask is formed with a pattern to be formed, a hole is formed so that a portion that is not the frame member 17 is exposed to light, and a portion that becomes the frame member 17 is formed as it is so as not to be exposed to light. When light is irradiated from above the mask, a portion of the resist not covered by the mask is exposed. When the second substrate 13 is immersed in the developer, only the exposed portion of the resist is dissolved, and the resist bordered by a square remains. This resist surface is a surface in contact with the electrode surface of the first substrate 12. Then, when the second substrate 13 is immersed in an etching solution, the portion not covered with the resist is dissolved, and the material of the frame member 17 formed on the second substrate 13 is removed up to the substrate surface. It remains in a three-dimensional shape. Finally, the frame member 17 is formed by removing the resist.

  FIG.4 (c) is a figure explaining an example of a partition member arrangement | positioning process. First, in the partition member arranging step, the partition member 5 is formed in another process using the photolithography method or the like. Then, the partition member 5 is disposed in the frame member 17 formed on the second substrate 13. By arranging the partition wall member 5 before filling the buffer body 6 and the display liquid 33, the partition wall member 5 can be positioned easily and accurately, and the gap between the frame member 17 and the partition wall member 5 is evenly spaced. Can be configured.

  FIG. 5D illustrates an example of the buffer filling process. In the buffer filling process, the gap formed between the outer periphery of the partition member 5 and the inner periphery of the frame member 17 is filled with glycerin as the buffer 6 without gaps in a vacuum environment so that air does not enter.

  FIG. 5E is a diagram for explaining an example of the display liquid filling process. In the display liquid filling process, the display liquid 33 in which the charged particles 31 are diffused is filled in all the cells C provided in the partition wall member 5 in a vacuum environment so that air does not enter. When the display liquid 33 is filled in the outer cell C of the partition wall member 5, the buffer member 6 is filled in the gap between the partition wall member 5 and the frame member 17 in FIG. And the frame member 17 does not flow.

  FIG. 5F illustrates an example of the partition wall member sealing step. In the partition member sealing step, the frame member 17 and the first substrate 12 are bonded via an adhesive such as an epoxy resin to form the liquid chamber R. Thus, the electrophoretic display medium 10 is manufactured.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications and changes can be easily made without departing from the spirit of the present invention. Can be inferred.

  For example, in the above-described embodiment, the X electrode 12a and the Y electrode 13a are provided on the opposing surfaces of the first substrate 12 and the second substrate 13, but the X electrode 12a and the Y electrode 13a are provided on the electrophoretic display medium 10. You may comprise so that the Y electrode 13a may not be provided. In this case, an apparatus provided with a pair of electrodes corresponding to the X electrode 12a and the Y electrode 13a is prepared, and the electrophoretic medium in which the X electrode 12a and the Y electrode 13a are not provided by the pair of electrodes provided in the apparatus. What is necessary is just to comprise so that an image may be displayed by pinching 10.

  Moreover, in the said Example, although the glycerol is filled in the clearance gap between the frame member 17 and the partition member 5 as the buffer body 6, for example, you may remain in the state with which gas, such as air, was satisfy | filled in the clearance gap. The number of parts can be reduced, and if the gap between the partition wall member 5 and the frame member 17 is a slight gap, the partition wall member 5 can be arranged to be movable in the liquid chamber R. The impact caused by the partition member 5 colliding with the frame member 17 can be reduced.

  In the above embodiment, the partition member 5 is not fixed to any of the first substrate 12, the second substrate 13, and the frame member 17. For example, the partition member 5 is fixed to the buffer body 6. Also good. Even if the partition wall member 5 is fixed to the buffer body 6, the buffer body 6 has elastic characteristics. Therefore, the partition wall member 5 is in the space surrounded by the first substrate 12, the second substrate 3, and the frame member 17. Can move. The partition member 5 may be fixed to a part or a plurality of locations of the first substrate 12, the second substrate 13, and the frame member 17. Except when the partition member 5 is fixed so as not to be movable, the partition member 5 can be moved even if the partition member 5 is fixed to each of the substrates 12 and 13 and the frame member 17, so that deterioration of display quality is suppressed. be able to.

  In the above embodiment, the electrophoretic display medium 10 is used in the separation type display device 1 configured to be detachable from the main body 20. For example, the electrophoretic display medium 10 and the main body 20 are integrated with each other. You may use for the integrated display apparatus comprised.

It is a perspective view which shows the structure of the whole display apparatus and an electrophoretic display medium. It is a typical sectional view of an electrophoretic display medium. It is an expanded sectional view which expands and shows one cell among sectional drawings shown in FIG. It is a top view which shows the manufacturing process of an electrophoresis medium, and sectional drawing corresponding to it. It is a top view which shows the manufacturing process of an electrophoresis medium, and sectional drawing corresponding to it.

Explanation of symbols

5 Partition member 6 Buffer 10 Electrophoretic display medium 12 First substrate 13 Second substrate 17 Frame member 31 Charged particle 33 Display liquid

Claims (5)

A pair of first and second substrates having opposite substrate surfaces, a frame member that maintains a predetermined distance between the substrate surfaces of the first substrate and the second substrate, and surrounded by the frame member, Is divided into a plurality of cells and sealed between the first substrate and the second substrate, and a partition member standing in the thickness direction of the first substrate or the second substrate, and depending on the direction of electrolysis And a display liquid in which charged particles that move are dispersed, and display characters and images on a display surface constituted by at least one of the first substrate and the second substrate depending on the position of the charged particles. In an electrophoretic display medium,
2. The electrophoretic display medium according to claim 1, wherein the partition member is movably installed in a space surrounded by the first substrate, the second substrate, and the frame member.   The partition member is installed in a non-fixed state with each of the first substrate, the second substrate, and the frame member, and a gap is provided between each of the first substrate, the second substrate, and the frame member. The electrophoretic display medium according to claim 1, further comprising:   Among the gaps, a gap between the partition member and the first substrate or a gap between the partition member and the second substrate is configured to be an interval through which the charged particles cannot pass. The electrophoretic display medium according to claim 2.   The electrophoretic display according to claim 1, further comprising a buffer body that fills a gap between the partition member and the frame member and cushions an external force applied to the partition member. Medium.   The buffer body has a liquid or gel-like body having immiscibility that is immiscible with the display liquid and a viscosity capable of buffering an external force applied to the partition member, or an elasticity capable of buffering an external force applied to the partition member. The electrophoretic display medium according to claim 4, wherein the electrophoretic display medium is a solid.

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