JP2011048089A - Display medium and display device - Google Patents

Abstract

An object of the present invention is to capture a bubble in a display unit by a capture unit and to prevent the bubble captured by the capture unit from returning to the display unit.
In a display device, when a display medium is directed in a direction in which a capture unit is positioned on the upper side in the gravity direction, bubbles A mixed in the display unit are caused to flow from the display unit to a passage through the buoyancy. As a result, it passes through the opening 52 of the partition wall 50 and flows into the capture unit 26. Thereby, the air bubbles A mixed in the display unit 24 are captured by the capturing unit 26. Even when the display device 10 is transported or the display device 10 is used in a state where the capture unit 26 is directed horizontally with respect to the display unit 24, the bubbles A captured by the capture unit 26 are It is difficult to return to the display unit 24 by being caught by the projections 54 formed on the partition wall 50.
[Selection] Figure 1

Description

  The present invention relates to a display medium and a display device.

  As the display medium, the display medium disclosed in Patent Document 1 is known. According to the display medium 10 disclosed in Patent Document 1, by providing a plurality of columnar members 22 at the corner 11 a of the cell 11 and on the inner peripheral side of the frame member 16, it is generated at the corner 11 a of the cell 11. Since the probability that the air bubbles are stably held in contact with the wall surface in the cell 11 including the columnar member 22 is increased, the movement of the air bubbles 30 to the display region E is suppressed, and the occurrence of display defects due to the air bubbles 30 is suppressed. can do.

  Further, since the columnar member 22 has a gap between it and the frame member 16, the bubbles 30 are in contact with the frame member 16 and the columnar member 22, and stably in the gap between the frame member 16 and the columnar member 22. By being held, the movement to the display area E is suppressed, and the occurrence of display defects due to the bubbles 30 can be further suppressed.

Japanese Patent Laying-Open No. 2006-243616 (FIG. 1)

  This invention makes it a subject to suppress that the bubble captured by the capture part returns to a display part while capturing the bubble of a display part by a capture part.

  The invention of claim 1 has a dispersion medium in which particles are dispersed, a display unit that displays an image by moving the particles by an electric field, a capture unit that captures bubbles in the dispersion medium of the display unit, A suppression structure that is arranged between the display unit and the capture unit so that the bubbles on the display unit side can be circulated to the capture unit, and suppresses the bubbles captured by the capture unit from returning to the display unit side. And a partition wall.

  According to a second aspect of the present invention, the partition wall constitutes at least a part of a wall surface of a flow part where bubbles on the display part side can flow to the capture part, and the suppression structure is provided on the flow part side of the partition wall. It is a display medium of Claim 1 comprised by the convex part which protrudes from the edge part to the said capture part side.

  According to a third aspect of the present invention, the partition wall constitutes at least a part of a wall surface of the flow part through which bubbles on the display part side can circulate to the capture part, and the suppression structure has an end part on the flow part side. The display medium according to claim 1, wherein the shape of the partition wall is inclined toward the capturing unit.

  According to a fourth aspect of the present invention, the outer shape including the display unit and the capturing unit is rectangular, and the capturing unit is disposed at a longitudinal end of the outer shape. It is a display medium as described in above.

  The invention according to claim 5 is the display medium according to any one of claims 1 to 4, wherein the display section is divided into a plurality of sections, and bubbles are allowed to flow to the outside of the partitioned areas. .

  Invention of Claim 6 is provided in the at least one part of the outer periphery of the said display part, The flow path which enables the bubble from the said display part to distribute | circulate to the said capture part is provided in any one of Claims 1-5 It is a display medium of description.

  A seventh aspect of the present invention is the display medium according to any one of the first to sixth aspects, wherein the capture unit is partitioned from the display unit so that the captured bubbles cannot flow to the display unit.

  The invention of claim 8 has a dispersion medium in which particles are dispersed, a display unit that displays an image by moving the particles by an electric field, and captures bubbles, and the captured bubbles cannot flow to the display unit. It is a display medium provided with the said display part and the capture part partitioned off.

  The invention according to claim 9 includes the display medium according to any one of claims 1 to 8 and an electric field forming unit that forms the electric field by applying a voltage between electrodes provided on the display medium. A display device provided.

  According to the structure of Claim 1 of this invention, compared with the case where the capture part and suppression structure which concern on Claim 1 are not provided, while the bubble of a display part is captured by a capture part, the bubble captured by the capture part is displayed. It can suppress returning to the part.

  According to the structure of Claim 2 or Claim 3 of this invention, compared with the case where it does not have the suppression structure which concerns on Claim 2 or Claim 3, a suppression structure can be comprised easily.

  According to the structure of Claim 4 of this invention, compared with the case where the capture part is not arrange | positioned at a longitudinal direction edge part, when a capture part is located in the gravity direction upper side, a capture part tends to capture a bubble.

  According to the structure of Claim 5 of this invention, compared with the case where the display part which concerns on Claim 5 is not provided, a capture part tends to capture a bubble.

  According to the structure of Claim 6 of this invention, compared with the case where the flow path which concerns on Claim 6 is not provided, a capture part tends to capture a bubble.

  According to the configuration of the seventh aspect of the present invention, it is possible to prevent the air bubbles captured by the capture unit from returning to the display unit as compared with the case where the display unit and the capture unit are not partitioned.

  According to the configuration of the eighth aspect of the present invention, it is possible to prevent the air bubbles captured by the capturing unit from returning to the display unit as compared with the case where the display unit and the capturing unit are not partitioned.

  According to the structure of Claim 9 of this invention, compared with the case where the display medium which concerns on Claim 9 is not provided, the bubble captured by the capture part can be prevented from returning to a display part.

FIG. 1 is a schematic plan view showing the overall configuration of the display device according to the present embodiment. FIG. 2 is a schematic cross-sectional view showing a partially enlarged display device according to the present embodiment, and shows a state where the mobile particle group is located on the back substrate side. FIG. 3 is a schematic cross-sectional view showing a partially enlarged display device according to the present embodiment, and shows a state where the mobile particle group is located on the surface substrate side. FIG. 4 is a schematic view showing a method for manufacturing a display medium according to the present embodiment. FIG. 5 is a schematic plan view showing the configuration of the partition wall according to the first modification. FIG. 6 is a schematic plan view showing the configuration of the partition wall according to the second modification. FIG. 7 is a schematic plan view showing the configuration of the partition wall according to the third modification. FIG. 8 is a schematic plan view showing a configuration in which convex portions are formed in the partition wall according to the fourth modification. FIG. 9 is a schematic plan view showing the configuration of the display medium according to the fifth modification. FIG. 10 is a schematic plan view showing the configuration of the display medium according to the sixth modification. FIG. 11 is a schematic plan view showing a configuration that enables air bubbles to flow between cells adjacent in the longitudinal direction of the display medium in the display medium according to the sixth modification. FIG. 12 is a schematic plan view showing the configuration of the display medium according to the seventh modification. FIG. 13 is a schematic cross-sectional view illustrating a configuration of a display medium according to a seventh modification. FIG. 14 is a schematic view showing a method for manufacturing a display medium according to a seventh modification. FIG. 15 is a schematic plan view showing a configuration having no partition in the display medium according to the seventh modification.

  Below, an example of an embodiment concerning the present invention is described based on a drawing.

(Configuration of the display device 10 according to the present embodiment)
First, the configuration of the display device 10 according to the present embodiment will be described. FIG. 1 is a schematic plan view showing an overall configuration of a display device 10 according to the present embodiment. 2 and 3 are schematic cross-sectional views showing the display device 10 according to the present embodiment partially enlarged.

  The display device 10 according to the present embodiment is, for example, a device that can store and rewrite images (specifically, a bulletin board, a circulation version, an electronic blackboard, an advertisement, a signboard, a flashing sign, electronic paper, an electronic newspaper, an electronic book) , And document sheets that can be shared with copiers and printers). Specifically, the display device 10 displays an image by electrophoresis, and includes a display medium 12 as shown in FIG.

  The display medium 12 includes a display unit 24 that displays an image and a capturing unit 26 that captures bubbles A of the display unit 24. The external shape of the display medium 12 including the display unit 24 and the capture unit 26 is rectangular, and the capture unit 26 is disposed at the longitudinal end of the external shape. The capture unit 26 is formed over the entire region of the display medium 12 in the short direction. In the display medium 12 according to the present embodiment, the orientation in which the capturing unit 26 is located on the upper side in the gravitational direction is a standard posture when used. A specific configuration of the display unit 24 will be described later.

  As shown in FIG. 1, on the outer periphery of the display medium 12, a joining portion that joins a later-described front substrate 20 (see FIGS. 2 and 3) and a later-described rear substrate 22 (see FIGS. 2 and 3). 42 is formed in a frame shape. The joining portion 42 is configured by a joining material 76 (see FIG. 4) that joins the front substrate 20 and the rear substrate 22. The display part 24 and the capture part 26 are sealed by the joint part 42 surrounding the outer periphery of the display part 24 and the capture part 26 and joining the front substrate 20 and the rear substrate 22.

  2 and 3, the display medium 12 includes a surface substrate 20 serving as an image display surface and a back substrate 22 disposed so as to face the surface substrate 20 with a gap between the surface substrate 20 and the surface substrate 20. It has. The surface substrate 20 includes a support substrate 38 and a surface electrode 40 formed on the surface of the support substrate 38 facing the back substrate 22. The back substrate 22 includes a support substrate 44 and a back electrode 46 formed on the surface of the support substrate 44 facing the front substrate 20.

  Of the front substrate 20 and the rear substrate 22, at least the front substrate 20 has translucency. Here, the translucency in this embodiment indicates that the transmittance of visible light is 60% or more.

  Examples of the support substrate 38 and the support substrate 44 include glass, plastic, polyethylene terephthalate resin, polyethylene naphthalate resin, polycarbonate resin, acrylic resin, polyimide resin, polyester resin, epoxy resin, and polyethersulfone resin. .

  The support substrate 38 and the support substrate 44 may be flexible or non-flexible. However, as described later, the display medium 12 is roll-to-roll. When manufactured by a method, a flexible one is selected.

  Examples of the surface electrode 40 and the back electrode 46 include oxides such as indium, tin, cadmium, and antimony, composite oxides such as ITO, metals such as gold, silver, copper, and nickel, and organic materials such as polypyrrole and polythiophene. Is used. These materials are used as, for example, a single layer film, a mixed film, or a composite film. These materials are formed by, for example, a vapor deposition method, a sputtering method, a coating method, a CVD method (vapor phase growth method), or the like.

  In addition, the display device 10 includes an electric field forming unit 16 that applies a voltage to the display medium 12 to form an electric field in the display medium 12 as shown in FIGS. 2 and 3. The electric field forming unit 16 is electrically connected to the front electrode 40 and the back electrode 46. The electric field forming unit 16 is a voltage applying device for applying a voltage to the surface electrode 40 and the back electrode 46. By applying a voltage between the surface electrode 40 and the back electrode 46 by the electric field forming unit 16, the surface electrode 40 An electric field is formed between the back electrode 46 and the back electrode 46. The electric field forming unit 16 of the display device 10 may be detachably connected to the display medium 12 (the front electrode 40 and the back electrode 46). In this case, for example, only when the display medium 12 needs to be rewritten or displayed, the display medium 12 is connected to the electric field forming unit 16 to display the image information and separated from each other during storage. 12 is configured to improve portability.

  In the above configuration, both the front substrate 20 and the rear substrate 22 are provided with electrodes (the front electrode 40 and the rear electrode 46), but may be provided only on either one. In this case, for example, one of the surface electrode 40 and the back electrode 46 is grounded, and the other is connected to the electric field forming unit 16.

(Configuration of the display unit 24 according to the present embodiment)
Next, the configuration of the display unit 24 according to the present embodiment will be described.
As shown in FIGS. 1, 2, and 3, the display unit 24 according to the present embodiment includes a partition member 32 that partitions a plurality of substrates between the front substrate 20 and the rear substrate 22.

  The partition member 32 has a function of maintaining a distance between the front substrate 20 and the rear substrate 22 and a function of partitioning a plurality of gaps between the front substrate 20 and the rear substrate 22. . The partition member 32 may have only a function of maintaining the distance between the front substrate 20 and the rear substrate 22 and does not partition the gap between the substrates.

  A region partitioned by the partition member 32 (hereinafter referred to as a cell) is surrounded by the front substrate 20, the back substrate 22, and the partition member 32. The partition member 32 forms cells two-dimensionally so as to correspond to each pixel when an image is displayed on the display medium 12.

  The partition member 32 is formed of a thermoplastic resin, a thermosetting resin, an electron beam curable resin, a photocurable resin, rubber, metal, or the like.

  The partition member 32 is formed by, for example, forming a layer of a photosensitive resin having adhesiveness (for example, thermoplastic resin: acrylic resin, acrylate, urethane, etc.) on one of the front substrate 20 and the rear substrate 22, Alternatively, a formation method may be used in which exposure is performed using a photolithography method to form a latent image on the resin layer and developed. Further, the partition member 32 may be formed by embossing the resin by thermal nanoimprint, optical nanoimprint, or nanoimprint combining these. Moreover, you may form the division member 32 using another well-known method.

  The partition member 32 may be colored or colorless, but is desirably colorless and transparent so as not to adversely affect the display image displayed on the display medium 12, and in this case, for example, transparent such as polystyrene, polyester, or acrylic Resin or the like is used. Note that “transparent” means having a transmittance of 50% or more with respect to visible light.

In the display unit 24 according to the present embodiment, as shown in FIGS. 2 and 3, the mobile particle group 34 and the dispersion medium 30 in which the mobile particle group 34 is dispersed are sealed in each cell. ing. The dispersion medium 30 in which the mobile particle group 34 is dispersed is preferably an insulating liquid. Here, “insulating” means that the volume resistance value is 10 ⁷ Ω · cm or more.

  Specifically, as the insulating liquid, for example, hexane, cyclohexane, toluene, xylene, decane, hexadecane, kerosene, paraffin, isoparaffin, silicone oil, modified silicone oil, dichloroethylene, trichloroethylene, perchloroethylene, high-purity petroleum, ethylene Glycol, alcohols, ethers, esters, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone, 2-pyrrolidone, N-methylformamide, acetonitrile, tetrahydrofuran, propylene carbonate, ethylene carbonate, benzine, diisopropylnaphthalene, olive oil , Isopropanol, trichlorotrifluoroethane, tetrachloroethane, dibromotetrafluoroethane Doya, mixtures thereof is preferably used.

Further, water (so-called pure water) from which impurities are removed so as to have the following volume resistance value may be used as the dispersion medium 30. Bodily The product resistance, it is desirably 10 ⁷ Ω · cm or more, more desirably less 10 ⁷ Ω · cm or more ^{10 19 Ω} · cm, still ^{10 10 Ω} · cm or more ^{10 19 Ω} · cm It is better that: By setting the volume resistance value in this range, an electric field is more effectively applied to the particle group, and generation of bubbles due to electrolysis of the dispersion medium 30 due to electrode reaction is suppressed.

  If necessary, the insulating liquid may contain acid, alkali, salt, dispersion stabilizer, stabilizer for anti-oxidation or ultraviolet absorption, antibacterial agent, preservative, etc. It is desirable to add so that it may become the range of the specific volume resistance value shown above.

  For insulating liquids, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, fluorosurfactants, silicone surfactants, metal soaps as charge control agents Alkyl phosphate esters, succinimides and the like may be added.

  Further, as the dispersion medium 30, a polymer resin may be used. The polymer resin is preferably a polymer gel, a polymer, or the like. Specifically, as the polymer resin, for example, gelatin, polyvinyl alcohol, poly (meth) acrylamide, or the like is used. These polymer resins may be used as the dispersion medium 30 together with the insulating liquid.

  The mobile particle group 34 encapsulated in each cell is composed of a plurality of particles, and is dispersed in the dispersion medium 30, and the surface substrate 20 and the surface substrate 20 according to the direction strength of the electric field formed in the cell. It moves between the back substrate 22 and the substrate.

  Examples of the mobile particles in the mobile particle group 34 include glass beads, alumina, titanium oxide, and other insulating metal oxide particles, thermoplastic or thermosetting resin particles, and a colorant on the surface of these resin particles. , Fixed particles, particles containing an insulating colorant in a thermoplastic or thermosetting resin, metal colloid particles having a plasmon coloring function, and the like are used.

  If necessary, a charge control agent that controls chargeability may be mixed with the resin of the mobile particles. Moreover, you may mix a magnetic material in the inside and surface of a mobile particle as needed. In addition, an external additive may be attached to the surface of the mobile particle as necessary.

  Further, in the display unit 24 according to the present embodiment, as shown in FIGS. 2 and 3, the reflecting member 36 is sealed in each cell. The reflection member 36 is arranged so as to exist over the entire surface of the front substrate 20 between the front substrate 20 and the rear substrate 22.

  The reflection member 36 has an optical reflection characteristic different from that of the particles constituting the movable particle group 34. A gap is formed between the reflecting members 36 through which each particle constituting the mobile particle group 34 can pass. The reflecting member 36 is dispersed in the dispersion medium 30 and is configured to move with the flow of the dispersion medium 30 so that the movable particles can pass through when the movable particle group 34 moves. Also good.

  Here, “having optical reflection characteristics different from the particles constituting the mobile particle group 34” means that the dispersion medium 30 in which only the mobile particle group 34 is dispersed and the reflective member 36 are compared with each other visually. Means that there is a difference that can be distinguished from each other in chromaticity, lightness, and saturation. Of these chromaticity, lightness, and saturation, it is desirable that the chromaticity is particularly different.

  For example, when the chromaticity is different, specifically, the “identifiable difference” is the CIELAB value in each of the dispersion medium 30 in which only the mobile particle group 34 is dispersed and the reflection member 36. It means that the difference between a * and b * when measured by X-Rite 404 manufactured by X-Rite is 5 or more.

  According to the configuration of the display unit 24 according to the present embodiment, when a voltage is applied from the electric field forming unit 16 to the front electrode 40 and the back electrode 46 of the display medium 12, the electric field according to the applied voltage is changed to the dispersion medium. 30 is formed.

  Due to the formed electric field, the mobile particle group 34 moves between the front substrate 20 and the rear substrate 22. For example, when the particles constituting the mobile particle group 34 are charged to the negative electrode and a positive voltage is applied to the front electrode 40 and a negative voltage is applied to the back electrode 46, the particles constituting the mobile particle group 34 are Then, it moves from the back substrate 22 side to the front substrate 20 side through the gap of the reflecting member 36 (see FIG. 3). At this time, when viewed from the front substrate 20 side, the color of the particles of the mobile particle group 34 located on the front substrate 20 side is visually recognized as the color of the display medium 12.

  On the other hand, when a negative voltage is applied to the front electrode 40 and a positive voltage is applied to the back electrode 46, the particles constituting the mobile particle group 34 pass through the gap of the reflecting member 36 and pass from the front substrate 20 side to the back substrate. It moves to the 22 side (refer FIG. 2). At this time, when viewed from the front substrate 20 side, the color of the reflective member 36 is visually recognized as the color of the display medium 12. The reflecting member 36 is charged with a polarity different from that of the mobile particles, and is configured to move between the substrates in the opposite direction to the mobile particles when a voltage is applied to the front electrode 40 and the back electrode 46. Also good.

(Configuration of the partition wall 50 according to the present embodiment)
Next, the configuration of the partition wall 50 according to the present embodiment will be described.
As shown in FIG. 1, the partition wall 50 according to the present embodiment is disposed between the display unit 24 and the capture unit 26 so that the bubbles A on the display unit 24 side can flow to the capture unit 26. The partition wall 50 is formed linearly along the short direction of the display medium 12 in plan view. The partition 50 is formed over the entire region from the front substrate 20 to the rear substrate 22.

  The partition wall 50 is formed with an opening 52 as an example of a flow part through which bubbles A on the display part 24 side can flow to the capture part 26. That is, the opening 52 is formed larger than the size of the bubble A that is assumed to remain and occur. The end face of the partition wall 50 constitutes a part of the wall surface of the opening 52.

  The opening 52 is disposed at the center in the longitudinal direction of the partition wall 50 in plan view. In addition, the position where the opening 52 is disposed may be on the end side in the longitudinal direction of the partition wall 50 in a plan view (for example, between the partition wall 50 and the joint portion 42). A plurality of openings 52 may be formed. The shape of the opening 52 may be any shape as long as the bubble A can pass through.

  Further, the opening 52 is formed, for example, by notching (not forming) a part of the partition wall 50 over the entire region from the front substrate 20 to the rear substrate 22. The opening 52 may be formed by notching (not forming) a part of the region, not the entire region from the front substrate 20 to the rear substrate 22. Further, the distribution part may be an opening formed by cutting out (not forming) a part of the bonding layer for bonding the front substrate 20 or the back substrate 22 and the partition wall 50 instead of the partition wall 50.

  The partition wall 50 has a suppression structure that suppresses the bubbles A captured by the capturing unit 26 from returning to the display unit 24 side. Specifically, the suppression structure includes a convex portion 54 that protrudes from the end of the partition wall 50 on the opening 52 side (the edge of the opening 52) toward the capturing portion 26. The convex portion 54 is formed over the entire region from the front substrate 20 to the rear substrate 22. In addition, the convex part 54 may be configured to be formed in a partial region instead of the entire region from the front substrate 20 to the rear substrate 22.

  In addition, a passage 56 is formed between the partition wall 50 and the display unit 24 along the partition wall 50 to allow the bubbles A from the display unit 24 to flow to the opening 52. The passage 56 is formed to have a wider passage width than the size of the bubble A that is assumed to remain and occur.

(Operation of the display device 10 according to the present embodiment)
Next, the operation of the display device 10 according to the present embodiment will be described.
In the display device 10 according to the present embodiment, when the display medium 12 is directed in a direction in which the capture unit 26 is located on the upper side in the gravity direction, the bubbles A mixed in the display unit 24 are caused to flow from the display unit 24 to the passage 56 by the buoyancy. , Passes through the opening 52 of the partition wall 50 and flows into the capture unit 26. Thereby, the air bubbles A mixed in the display unit 24 are captured by the capturing unit 26.

  When the display device 10 is used while displaying an image on the display unit 24 in a state where the capturing unit 26 is directed upward in the gravity direction, the bubbles A captured by the capturing unit 26 remain in the capturing unit 26. The display unit 24 is not returned.

  Even when the display device 10 is transported or used in a state where the display medium 12 is oriented in a direction in which the capture unit 26 is positioned on the horizontal side with respect to the display unit 24, The bubble A captured by the capturing unit 26 is caught by the convex portion 54 formed on the partition wall 50 and is difficult to return to the display unit 24.

  As described above, since the bubbles A captured by the capturing unit 26 are unlikely to return to the display unit 24, the image displayed on the display unit 24 is not easily affected by the bubbles A.

  Note that as the bubbles A remaining and generated in the display unit 24, bubbles mixed during manufacturing and bubbles generated with time can be considered.

  As the bubbles generated over time, for example, bubbles generated by electrolysis of the dispersion medium 30 resulting from the electrode reaction can be considered. Further, bubbles generated by vaporizing the gas dissolved in the dispersion medium 30 are also conceivable.

As the bubbles mixed in the manufacturing, for example, when the dispersion medium 30 in which the mobile particle group 34 is dispersed is filled between the front substrate 20 and the rear substrate 22 and the front substrate 20 and the rear substrate 22 are bonded together. In addition, when the dispersion medium 30 is filled in an amount smaller than the space volume between the substrates, a shortage with respect to the space volume may remain between the substrates as bubbles.
As shown in FIG. 5, the partition wall 50 has an outer periphery along the partition wall 50 from the tip of the convex portion 54 as a suppression structure that suppresses the bubbles A captured by the capture unit 26 from returning to the display unit 24 side. The structure which has the convex part 58 formed in the side may be sufficient (1st modification).
According to the configuration of FIG. 5, the bubbles A captured by the capturing unit 26 are easily caught by the convex portions 54 and the convex portions 58, and are difficult to return to the display unit 24. In particular, the bubble A that has entered the region surrounded by the partition wall 50, the convex portion 54, and the convex portion 58 does not reach the display portion 24 unless it bypasses the convex portion 54 and the convex portion 58, so that it is difficult to return to the display portion 24. Become.

(Example of manufacturing method of display medium 12 according to this embodiment)
Next, an example of a method for manufacturing the display medium 12 according to the present embodiment will be described. FIG. 4 is a schematic view showing a method for manufacturing the display medium 12 according to the present embodiment.

  In the manufacturing method, as shown in FIG. 4, the front substrate 20 and the rear substrate 22 are respectively wound around the winding members 70 and 72 in advance in a roll shape. In addition, the partition member 32 and the partition wall 50 are formed on the rear substrate 22 in advance.

  In this manufacturing method, first, the back substrate 22 wound in a roll shape is unwound from the winding member 72 and conveyed, and the bonding material 76 is applied to the outer periphery of the conveyed rear substrate 22 by the coating device 74. Applied.

  Next, in the back substrate 22 on which the bonding material 76 is applied to the outer peripheral portion, the dispersion medium 30 in which the mobile particle group 34 is dispersed is passed through each cell and passage that is partitioned by the partition member 32 by the filling device 78. 56 and the capture unit 26 are filled. At this time, the dispersion medium 30 is equal to or larger than the volume of all the cells (display unit 24), and the spatial volume between the front substrate 20 and the rear substrate 22 (the volume including the display unit 24, the passage 56, and the capture unit 26). ) The following quantities are filled:

  Next, the back substrate 22 filled with the dispersion medium 30 is sandwiched between rolls 80 while being superposed on the front substrate 20 unwound from the winding member 70, and bonded to the front substrate 20. At this time, the capture unit 26 is formed on the upstream side in the transport direction of the back substrate 22 with respect to the display unit 24. The bubble A remaining in the cell is squeezed upstream in the transport direction by the roll pressure of the roll 80, flows into the capture unit 26 through the opening 52 of the partition wall 50, and is captured by the capture unit 26.

  Next, the bonding material 76 is cured (for example, ultraviolet curing) by the curing device 82, and the back substrate 22 and the front substrate 20 are fixed to each other at the outer peripheral portion thereof to form the bonded portion 42, whereby the display medium 12 is completed. Next, the display medium 12 to which the rear substrate 22 and the front substrate 20 are fixed is wound up in a roll shape by the winding member 86.

  The partition member 32 is not limited to the configuration formed in advance on the back substrate 22, and for example, the partition member 32 is wound in advance in a roll shape, and the dispersion medium 30 is filled while being unwound and attached to the back substrate 22. It may be a configuration.

(Configuration of partition 150 according to the second modification)
Next, the configuration of the partition 150 according to the second modification will be described. FIG. 6 is a schematic plan view showing the configuration of the partition 150 according to the second modification.

  As shown in FIG. 6, the partition wall 150 according to the second modification is disposed between the display unit 24 and the capture unit 26 so that the bubbles A on the display unit 24 side can flow to the capture unit 26.

  In the partition wall 150, an opening 152 is formed as an example of a circulation part that can circulate the bubbles A on the display part 24 side to the capture part 26. That is, the opening 152 is formed larger than the size of the bubble A that is assumed to remain and occur.

  The opening 152 is formed at the center in the longitudinal direction of the partition wall 150 in plan view. It should be noted that the position where the opening 152 is formed may be on the end side in the longitudinal direction of the partition wall 150 in plan view (for example, between the partition wall 50 and the joint portion 42). The shape of the opening 152 may be any shape as long as the bubble A can pass through.

  The opening 152 is formed by, for example, notching (not forming) a part of the partition 150 over the entire region from the front substrate 20 to the rear substrate 22. The opening 152 may be formed by notching (not forming) a part of the region, not the entire region from the front substrate 20 to the rear substrate 22. Further, the distribution part may be an opening formed by cutting out (not forming) a part of the bonding layer for bonding the front substrate 20 or the back substrate 22 and the partition 150 instead of the partition 150.

  The partition wall 150 according to the second modified example has a suppression structure having a shape in which the opening 152 side is inclined toward the capturing unit 26 side. Specifically, the partition wall 150 is formed in a square shape so that the upper side (capture part 26 side) in FIG. 6 gradually tapers from the outer periphery toward the center part in plan view.

  When the opening 152 is arranged at one end in the longitudinal direction of the partition wall 150 in plan view, the upper end in FIG. A partition 150 is formed so that the side is tapered.

  In addition, a passage 156 is formed between the partition wall 150 and the display unit 24 along the partition wall 150 to allow the bubbles A from the display unit 24 to flow to the opening 152. The passage 156 is formed with a passage width wider than the size of the bubble A that is assumed to remain and occur.

  As in the case of the partition 50 described above, a protrusion protruding from the end of the partition 150 on the opening 152 side (the edge of the opening 152) toward the capturing unit 26 may be formed.

  According to the configuration of the second modified example, the air bubbles A from the display unit 24 easily flow into the capturing unit 26 from the opening 152 through the partition wall 150. On the other hand, in the bubbles A captured by the capture unit 26, the distance between the upper joint 42 and the partition wall 50 in FIG. 6 is narrower on the center side (opening 152 side) than the side in the short direction of the display medium 12. Therefore, it is difficult to return to the display unit 24.

(Configuration of partition wall 350 according to the third modification)
Next, the configuration of the partition wall 350 according to the third modification will be described. FIG. 7 is a schematic plan view showing the configuration of the partition wall 350 according to the third modification.

  The partition wall 350 according to the third modification has a labyrinth structure (labyrinth structure), and specifically includes a plurality of partition walls 350A, 350B, and 350C as shown in FIG.

  The partition walls 350A, 350B, and 350C are linearly formed along the short side direction of the display medium 12 in a plan view, and are arranged at intervals along the longitudinal direction of the display medium 12 in a plan view. The intervals between the partition walls 350A, 350B, and 350C are wider than the size of the bubble A that is supposed to remain and be generated.

  Between the partition wall 350 </ b> A and the joint portion 42, an opening 352 </ b> A as an example of a circulation portion that can circulate the bubbles A on the display portion 24 side to the capture portion 26 is one end side in the short direction of the display medium 12 in a plan view. (Left side in FIG. 7). Between the partition wall 350B and the joint portion 42, an opening 352B through which the bubbles A on the display unit 24 side can flow to the capturing unit 26 is located at the other end side in the short side direction of the display medium 12 in the plan view (right side in FIG. ). Between the partition wall 350C and the joint portion 42, an opening 352C through which the bubbles A on the display unit 24 side can flow to the capturing unit 26 is one end side in the short direction of the display medium 12 in plan view (left side in FIG. 7). Is formed. That is, the openings 352A, 352B, and 352C are larger than the size of the bubble A that is supposed to remain and occur, and are alternately formed on the left and right.

  As described above, between the partition walls 350A, 350B, and 350C, from one end portion (left end portion in FIG. 7) of the display medium 12 in a plan view to the other end portion (right end portion in FIG. 7), A zigzag passage is formed from the other end (right end in FIG. 7) to one end (left end in FIG. 7).

  The openings 352A, 352B, and 352C are formed by, for example, notching (not forming) part of the partition walls 350A, 350B, and 350C over the entire region from the front substrate 20 to the rear substrate 22, respectively. Yes. Note that the openings 352A, 352B, and 352C may be formed by notching (not forming) a part of the region, not the entire region from the front substrate 20 to the rear substrate 22. In addition, the flow portion is formed by notching (not forming) a part of the bonding layer that joins the front substrate 20 or the back substrate 22 and the partition walls 350A, 350B, and 350C, not the partition walls 350A, 350B, and 350C. It may be an opening.

  A passage 356 is formed between the partition wall 350A and the display unit 24 along the partition wall 350A to allow the bubbles A from the display unit 24 to flow to the opening 352A.

  According to the configuration of the partition wall 350 according to the third modified example, the bubble A once captured by the capturing unit 26 does not pass through the zigzag passage formed between the partition walls 350A, 350B, and 350C. Therefore, it is difficult to return to the display unit 24.

As shown in FIG. 8, the partition walls 350A, 350B, and 350C may be formed with protruding portions 354 that protrude toward the capturing portion 26 at the ends of the openings 352A, 352B, and 352C, respectively. Fourth modified example). According to this configuration, the bubble A captured by the capturing unit 26 is easily caught by the convex portion 354, and therefore, it is difficult to return to the display unit 24.
Furthermore, at least one of the partition walls 350A, 350B, and 350C may be inclined.

  As described above, the display medium 12 according to the present embodiment replaces the partition 50 with the partition according to the first modification, the partition 150 according to the second modification, the partition 350 according to the third modification, and the fourth modification. Any of the partition walls according to the example or a combination thereof may be used, and the partition wall has a suppression structure that suppresses the return of the bubbles A captured by the capture unit 26 to the display unit 24. I need it.

(Display medium 112 according to the fifth modification)
Next, the configuration of the display medium 112 according to the fifth modification will be described. FIG. 9 is a schematic plan view showing the configuration of the display medium 112 according to the fifth modification.

  As shown in FIG. 9, the display medium 112 according to the fifth modification includes a flow passage 160 that allows the bubbles A from the display unit 24 to flow to the capturing unit 26. The flow passage 160 includes a passage 56 and passages 160 </ b> A, 160 </ b> B, and 160 </ b> C formed along the outer periphery of the display unit 24 other than the arrangement side of the passage 56.

  Further, the flow passage 160 surrounds the outer periphery of all the cells by the passage 56 and the passages 160A, 160B, and 160C, and has a frame shape. The flow passage 160 is formed to have a passage width wider than the size of the bubble A that is assumed to remain and occur.

  According to the configuration of the display medium 112 according to the fifth modified example, even when the capturing unit 26 faces other than the upper side in the gravitational direction, the bubbles A mixed in the display unit 24 are generated in the flow passage 160 by the buoyancy. It flows into the passages 160A, 160B, 160C.

  Thereafter, when the capture unit 26 is directed upward in the gravity direction, the bubbles A that have flowed into the passages 160A, 160B, and 160C of the flow passage 160 pass through the passage 56 to the capture unit 26 through the opening 52 of the partition wall 50 due to the buoyancy. Inflow.

  As described above, the bubble A once flowing into the flow passage 160 is easily captured by the capturing unit 26, but is difficult to return to the cell by the partition member 32.

  Further, even when the bubble A captured by the capturing unit 26 returns to the flow path 160, it is difficult to return to the cell and is easily captured by the capturing unit 26 again.

  The flow path 160 may be formed along two or three of the four sides of the rectangular display medium 12. That is, the flow passage 160 may be constituted by, for example, the passage 56 and the passage 160A, or may be constituted by the passage 56 and the passages 160A and 160B.

(Display Medium 212 According to Sixth Modification)
Next, the configuration of the display medium 212 according to the sixth modification will be described. FIG. 10 is a schematic plan view showing the configuration of the display medium 212 according to the sixth modification.

  As shown in FIG. 10, the display medium 212 according to the sixth modification has an opening 262 in the partition member 32 that allows air bubbles to flow out of the cell. The opening 262 is formed, for example, by notching a part of the partition member 32 over the entire region from the front substrate 20 to the rear substrate 22. Note that a configuration in which not all regions from the front substrate 20 to the rear substrate 22 are cut out in some regions may be employed. Further, instead of the partition member 32, the opening may be formed by notching a part of the bonding layer that joins the surface substrate 20 or the back substrate 22 and the partition member 32.

  In addition, the display medium 212 according to the sixth modification includes a flow passage 160 that allows the bubbles A from the display unit 24 to flow to the capturing unit 26 as in the display medium 112 according to the fifth modification. The flow passage 160 includes a passage 56 and passages 160 </ b> A, 160 </ b> B, and 160 </ b> C formed along the outer periphery of the display unit 24 other than the arrangement side of the passage 56.

  Further, the flow passage 160 surrounds the outer periphery of all the cells by the passage 56 and the passages 160A, 160B, and 160C, and has a frame shape. The flow passage 160 is formed to have a passage width wider than the size of the bubble A that is assumed to remain and occur.

  The opening 262 allows the bubble A to flow through the adjacent cells, and allows the bubble A to flow through the cell and the flow passage 160 adjacent to the cell.

  According to the configuration of the display medium 212 according to the sixth modification, the bubbles A remaining or generated in the cells flow into the adjacent cells on the upper side in the gravity direction through the openings 262. The bubbles A collected in the cells flow into the upper flow path 160 (passage 56, passages 160A, 160B, 160C) due to the buoyancy.

  When the capture unit 26 is directed upward in the gravitational direction, the bubbles A that have flowed into the passages 160A and 160C flow into the passage 56 due to their buoyancy, and the bubbles A that have flowed into the passage 560 have It flows into the capture part 26 through the opening 52. In this way, the bubbles A in the cell are efficiently captured by the capturing unit 26.

  Note that the flow path 160 may not be formed. Further, it is not necessary to form the opening 262 so that all the adjacent cells circulate. For example, as shown in FIG. 11, the bubbles A can be circulated between the cells adjacent in the longitudinal direction of the display medium 12. The opening 262 may be formed as described above.

(Display medium 312 according to the seventh modification)
Next, the configuration of the display medium 312 according to the seventh modification will be described. FIG. 12 is a schematic plan view showing the configuration of the display medium 312 according to the seventh modification. FIG. 13 is a schematic cross-sectional view showing the configuration of the display medium 312 according to the seventh modification.

  As shown in FIGS. 12 and 13, in the display medium 312 according to the seventh modification, the bubbles A captured by the capturing unit 26 cannot flow to the display unit 24, and the capturing unit 26 is partitioned from the display unit 24. ing. Specifically, in the passage 56 portion formed between the partition wall 50 and the display unit 24, the front substrate 20 and the rear substrate 22 are fixed, whereby the capture unit 26 and the display unit 24 are partitioned. Yes. In FIG. 12 and FIG. 13, a fixed portion between the front substrate 20 and the rear substrate 22 is indicated by a symbol K.

  According to the configuration of the display medium 312 according to the seventh modification, the bubbles A captured by the capturing unit 26 do not return to the display unit 24, and the image displayed on the display unit 24 is affected by the bubbles A. There is no.

  Next, a method for manufacturing the display medium 312 according to the seventh modification will be described. FIG. 14 is a schematic view showing a method for manufacturing the display medium 312 according to the seventh modification.

  In the manufacturing method, as shown in FIG. 14, the front substrate 20 and the back substrate 22 are respectively wound in advance on the winding members 70 and 72 in a roll shape. In addition, the partition member 32 and the partition wall 50 are formed on the rear substrate 22 in advance.

  In this manufacturing method, first, the back substrate 22 wound in a roll shape is unwound from the winding member 72 and conveyed, and the bonding material 76 is applied to the outer periphery of the conveyed rear substrate 22 by the coating device 74. Applied.

  Next, on the back substrate 22 to which the bonding material 76 is applied, the dispersion medium 30 in which the mobile particle group 34 is dispersed is filled in the cells 56, the passages 56, and the traps by the filling device 78. The part 26 is filled. At this time, the dispersion medium 30 is equal to or larger than the volume of all the cells (display unit 24), and the space volume between the front substrate 20 and the rear substrate 22 (the volume including the display unit 24, the passage 56, and the capture unit 26). ) The following quantities are filled:

  Next, the back substrate 22 filled with the dispersion medium 30 is sandwiched between rolls 80 while being superposed on the front substrate 20 unwound from the winding member 70, and bonded to the front substrate 20. At this time, the capture unit 26 is formed on the upstream side in the transport direction of the back substrate 22 with respect to the display unit 24. The bubble A remaining in the cell is squeezed upstream in the transport direction by the roll pressure of the roll 80, flows into the capture unit 26 through the opening 52 of the partition wall 50, and is captured by the capture unit 26.

  Next, the bonding material 76 is cured (for example, ultraviolet curing) by the curing device 82, and the back substrate 22 and the front substrate 20 are fixed to each other at the outer peripheral portion, so that the bonding portion 42 is formed.

  Next, the back substrate 22 fixed to the front substrate 20 at the outer peripheral portion is fixed to the front substrate 20 by the fixing device 388 being heated and pressurized between the display unit 24 and the capture unit 26, and the display unit 24 and the capture unit 26 are partitioned to complete the display medium 12. The completed display medium 12 is wound up in a roll shape by the winding member 86.

  The display medium 312 according to the seventh modification may be configured without the partition wall 50 as shown in FIG. In this configuration, the capture unit 26 and the display unit 24 are partitioned by fixing the front substrate 20 and the back substrate 22 between the display unit 24 and the capture unit 26. Even in the configuration without the partition wall 50, for example, it is manufactured by the manufacturing method shown in FIG.

  The display device 10 according to the present embodiment is configured by combining some of the display medium 112 according to the fifth modification, the display medium 212 according to the sixth modification, and the display medium 312 according to the seventh modification. May be. Further, the partition wall according to the first modification example with respect to any one of the display medium 112 according to the fifth modification example, the display medium 212 according to the sixth modification example, the display medium 312 according to the seventh modification example, or a combination thereof. The partition 150 according to the second modification, the partition 350 according to the third modification, the partition according to the fourth modification, or a combination thereof may be applied.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made.

DESCRIPTION OF SYMBOLS 10 Display apparatus 12,112,212,312 Display medium, 16 Electric field formation part, 24 Display part, 26 Capture part, 30 Dispersion medium, 32 Compartment member, 50,150,250,350 Partition, 52,152,252, 262,352A opening, 54,354 convex part, 160 flow path

Claims (9)

A display unit having a dispersion medium in which particles are dispersed and displaying an image by moving the particles by an electric field;
A capture unit for capturing bubbles in the dispersion medium of the display unit;
A suppression structure that is arranged between the display unit and the capture unit so that the bubbles on the display unit side can be circulated to the capture unit, and suppresses the bubbles captured by the capture unit from returning to the display unit side. A partition having
A display medium comprising: The partition wall constitutes at least a part of the wall surface of the flow part where bubbles on the display part side can flow to the capture part,
The display medium according to claim 1, wherein the suppression structure is configured by a convex portion that protrudes from an end portion of the partition wall on the flow portion side to the capture portion side. The partition wall constitutes at least a part of the wall surface of the flow part where bubbles on the display part side can flow to the capture part,
The display medium according to claim 1, wherein the suppression structure has a shape of a partition wall whose end on the flow portion side is inclined toward the capture portion.   The display medium according to claim 1, wherein an outer shape including the display unit and the capturing unit is rectangular, and the capturing unit is disposed at a longitudinal end portion of the outer shape.   The display medium according to any one of claims 1 to 4, wherein the display unit is divided into a plurality of sections, and bubbles can be distributed to the outside of the partitioned areas.   The display medium according to claim 1, further comprising a flow passage formed on at least a part of an outer periphery of the display unit and allowing air bubbles from the display unit to flow to the capture unit.   The display medium according to any one of claims 1 to 6, wherein the capture unit is partitioned from the display unit so that the captured bubbles cannot flow to the display unit. A display unit having a dispersion medium in which particles are dispersed and displaying an image by moving the particles by an electric field;
Capturing air bubbles, and the captured air bubbles that are separated from the display unit so that the captured air bubbles cannot flow to the display unit,
A display medium comprising: The display medium according to any one of claims 1 to 8,
An electric field forming unit configured to form a voltage by applying a voltage between electrodes provided on the display medium;
A display device comprising:

Images