JP2015169835A - reflective display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflective display device, in which a margin for the accuracy of a via-hole can be maintained and opening of a via-hole at an undesirable position of a substrate can be prevented.SOLUTION: The reflective display device includes a display medium comprising at least one electro-responsive material sealed between two substrates opposing to each other, at least one of which has light-transmitting property. One substrate has light-transmitting property; and a light-transmitting electrode covering at least a display region, and a partition wall are disposed between the one substrate and the other substrate. A bar-like electrode is disposed on a surface at the one substrate side, of the other substrate; a wiring line part for display is disposed on an opposite surface of the other substrate to the one substrate; and a via-hole to pass a wiring line part for connection to connect the bar-like electrode and the wiring line part for display is formed in the other substrate. The bar-like electrode is formed wider in a transverse direction of the electrode in a part compared in other part of the electrode; and the via-hole is formed to overlap the wider part of the bar-like electrode.

Description

  The present invention relates to a reflective display device applied to electronic paper and the like.

  Recently, as a reflective display device, an electrophoretic display device using an electrophoretic material as an electroresponsive material contained in a display medium has been widely used. An electrophoretic display device is a device that displays information by using electrophoretic migration, that is, particle movement, of an electrophoretic body (usually electrophoretic particles) in air or in a solvent. In general, an electrophoretic state is controlled by applying an electric field between two substrates, thereby realizing a desired display. As the electrophoretic body, charged powder as well as charged particles can be used. In that case, the charged powder electrophoreses in the gas.

  In recent years, the electrophoretic display device has attracted attention especially as an electronic paper. When applied as an electronic paper, it is possible to enjoy advantages such as visibility at the printed matter level (easy for eyes), ease of information rewriting, low power consumption, and light weight.

  However, in an electrophoretic display device, display defects, particularly a decrease in contrast, may occur due to sedimentation or uneven distribution of particles or powder. In order to prevent this phenomenon, it is used to form partition walls between the upper and lower electrode substrates and divide the migration space of the particles and powder to be electrophoresed, that is, the movement space into minute spaces. This minute space is called a cell or a pixel. In each cell, ink or gas (display medium) containing an electrophoretic body is enclosed. For example, Japanese Unexamined Patent Application Publication No. 2005-202245 discloses a conventional example of such an electrophoretic display device.

  Such an electrophoretic display device can perform various displays depending on the pattern of electrodes formed on the substrate. For example, Patent Document 2 (Japanese Patent Laid-Open No. 2011-14067) discloses an electrophoretic display device for displaying a barcode. In the electrophoretic display device, a plurality of bar-shaped electrodes are provided on a substrate.

JP-A-2005-202245 JP 2011-14067 A

  As described above, in a substrate provided with a plurality of bar-shaped electrodes, an electrode is provided on one surface of the substrate, a display wiring portion is provided on the other surface, and a bar-shaped electrode is provided on the substrate. Some have vias formed therethrough for connecting wiring portions for connecting electrodes and display wiring portions. In this case, the via is formed so as to penetrate the substrate toward the electrode so that the connection wiring portion is electrically connected to the electrode. The via is generally formed by laser or punching.

  However, since the bar-shaped electrode needs to be provided with high density based on the standard, the via accuracy margin is small, that is, the via needs to be formed with high accuracy. If the via is formed outside the accuracy margin, the via opens at an undesired position on the substrate, and for example, the connection wiring portion through the via is connected to the undesired electrode. May cause problems such as short circuit.

  The present invention has been made based on such circumstances, and its purpose is a reflective type capable of ensuring a via accuracy margin and preventing the via from opening at an undesired position on the substrate. It is to provide a display device.

  According to the present invention, a display medium including at least one kind of electrically responsive material is sealed between two opposing substrates, at least one of which is light-transmitting, and a predetermined electric field is generated between the two substrates. A reflective display device that performs desired display when given, wherein one substrate has translucency, and a display is provided on a surface of the other substrate opposite to the one substrate. And a via is formed on the other substrate for passing through the connecting wiring portion that connects the bar-shaped electrode and the display wiring portion. The portion is formed to be wider in the short direction of the electrode than the other portion to be a wide portion, and the other portion is not wide in the short direction of the electrode compared to the wide portion. The via is directed from the one substrate side toward the other substrate side. Viewed in a reflection type display device characterized by being formed so as to overlap with the wide portion of the bar-shaped electrodes.

  Preferably, a plurality of the bar-shaped electrodes are provided so as to be aligned in the short direction of the electrodes, and one of the adjacent bar-shaped electrodes has the wide portion in the longitudinal direction of the electrodes. The bar-shaped electrode is provided such that the position does not overlap the position of the wide portion of the other electrode in the longitudinal direction of the electrode.

  The bar-shaped electrode may be arranged such that the wide portion of the one electrode is aligned with the non-wide portion of the other electrode in the short direction of the electrode. In this case, a part of the non-wide part of the bar-shaped electrode is formed to be narrower in the width direction of the electrode than the other part of the non-wide part, resulting in a narrow part. Preferably, the bar-shaped electrode is arranged such that the wide portion of the one electrode is aligned with the narrow portion of the other electrode in the short direction of the electrode. Further, the bar-shaped electrode may be arranged such that the wide portion of the one electrode does not line up with the non-wide portion of the other electrode in the short direction of the electrode.

  According to the reflective display device of the present invention, a part of the bar-shaped electrode is formed wider than the other part in the short direction of the electrode to be a wide part, and the other part is It is a non-wide portion that is not wide in the short direction of the electrode as compared with the wide portion, and the via has a bar-like shape when viewed in the direction from the one substrate side to the other substrate side. By being formed so as to overlap with the wide portion of the electrode, it is possible to secure a via accuracy margin in the wide portion of the bar-shaped electrode, and to prevent the via from opening at an undesired position on the substrate. .

1 is a cross-sectional view schematically showing a configuration of a reflective display device according to a first embodiment of the present invention. FIG. 2 is a plan view of a plurality of bar-shaped electrodes provided in the reflective display device shown in FIG. 1. 3A and 3B are enlarged views of the bar-shaped electrode illustrated in FIG. 2, in which FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line III-III in FIG. It is detailed sectional drawing of a bar-shaped electrode. It is a flowchart which shows schematically the manufacturing method of the reflection type display apparatus shown in FIG. It is a figure which shows roughly an example of the partition formation process of FIG. It is a figure explaining the definition of the width | variety of the top surface of a partition. It is a figure which shows roughly an example of the contact bonding layer formation process of FIG. FIG. 6 is a diagram schematically showing an example of a display medium arranging step in FIG. 5. It is sectional drawing which shows a mode that the other board | substrate is adhere | attached on one board | substrate in the opposing board | substrate adhesion process of FIG. It is a figure explaining the 2nd Embodiment of this invention. It is a figure explaining the 3rd Embodiment of this invention. It is a figure explaining the 4th Embodiment of this invention. It is a figure explaining the 5th Embodiment of this invention. It is a figure explaining the 6th Embodiment of this invention.

  FIG. 1 is a cross-sectional view schematically showing a configuration of a reflective display device according to a first embodiment of the present invention. In the reflective display device according to the present embodiment, at least one kind of electrically responsive material is provided between two opposing substrates 11 and 16 on which electrodes 11e and 16e each having translucency are formed. A fluid-like display medium (ink) 13 is enclosed, and a desired display is performed when a predetermined electric field is applied between the two substrates 11 and 16. In the present embodiment, one substrate 11 is disposed on the viewing side, and the other substrate 16 is disposed on the non-viewing side.

  Here, in the specification and claims of the present application, “translucent” means a property of transmitting light. In the present embodiment, the substrate (one substrate 11) arranged on the viewing side has a light-transmitting property such that the total light transmittance is 50% or more, preferably 80% or more, more preferably 90% or more. have.

  One substrate 11 includes a light-transmitting film such as polyethylene (PE), polyethylene terephthalate (PET), polyethersulfone (PES), polyethylene naphthalate (PEN), or light-transmitting glass, and indium tin oxide (ITO). ), Zinc oxide (ZnO), tin oxide (SnO), or the like having a light-transmitting electrode 11e (hereinafter referred to as a light-transmitting electrode) so as to cover at least the display region 60 of one substrate 11 is typical. Can be used. Here, the “display area 60” refers to an area used for a desired display in the reflective display device.

  The translucent electrode 11e can be formed by a coating method, a vapor deposition method, or the like. The translucent electrode 11e of the present embodiment is formed as a common electrode.

  The thickness of one substrate 11 is preferably 10 μm to 1 mm. If it is thinner than 10 μm, the strength as a panel cannot be obtained and the risk of breakage increases. On the other hand, if it is thicker than 1 mm, the panel weight becomes too heavy and the handling becomes inconvenient and the cost also increases. Because. A suitable thickness range that is difficult to break and easy to handle is about 50 μm to 300 μm.

  The surface on the ink 13 side of one substrate 11 may be subjected to an oxidation prevention treatment by a plating treatment. In addition, a barrier layer may be provided on the surface (outside) opposite to the ink 13 of one substrate 11. The function of the barrier layer is to prevent display deterioration caused by the ink 13 serving as a display medium adsorbing moisture. In this embodiment, when the barrier layer is provided on one substrate 11 arranged on the viewing side, the barrier layer needs to be transparent and can be obtained by depositing an inorganic film. Or the film in which the barrier layer was previously formed may be bonded together.

  One substrate 11 can be applied in either a roll shape or a sheet shape.

  As the other substrate 16, a substrate in which an electrode 16 e is formed of a conductive material such as a metal on the surface of a substrate such as a resin film, a resin plate, glass, epoxy glass (glass epoxy), or the like can be used. For the other substrate 16, a base material having translucency may be used. Furthermore, it may be an opaque base material that is translucent, but an opaque glass base material, resin film, resin plate, glass, epoxy glass with the other surface different from the electrode surface roughened. (Garaepo) or the like can be used. In the present embodiment, since the other substrate 16 is disposed at a position opposite to the viewing side, it is not necessary to have translucency. However, when the same physical properties as the one substrate 11 such as thermal expansion characteristics are required, a light-transmitting member similar to the one substrate 11 can be used.

  In the present embodiment, the electrode 16e is a bar-shaped electrode, and a plurality of electrodes 16e are provided on the surface of the other substrate 16 on the one substrate 11 side. Specifically, as shown in FIG. 2, a plurality of electrodes 16e are provided so as to be arranged with a gap g in the short direction of the electrode 16e (the direction indicated by arrow S in the figure). FIG. 2 is a plan view of a plurality of bar-shaped electrodes 16e provided in the reflective display device shown in FIG.

  The electrode 16e includes a wide portion 161, a narrow portion 162, and an intermediate portion 163 located between the wide portion 161 and the narrow portion 162. The electrode 16e is formed by, for example, a sputtering method using a metal mask.

  In the present embodiment, the wide portion 161 protrudes on both sides in the lateral direction with respect to the intermediate portion 163. That is, the wide portion 161 is formed wider in the short direction of the electrode 16e than the narrow portion 162 and the intermediate portion 163 as non-wide portions that are other portions with respect to the wide portion 161. Further, the narrow portion 162 is narrower (thinner) on both sides in the short direction than the intermediate portion 163. That is, the narrow portion 162 is formed narrower in the lateral direction of the electrode 16e than the intermediate portion 163.

  In the present embodiment, as an example, the width dimension W1 of the wide portion 161 is set to 350 μm, the width dimension W2 of the narrow portion 162 is set to 150 μm, and the width dimension W3 of the intermediate portion 163 is set to 250 μm. Is set. In the present embodiment, it is preferable that the gap g is secured by at least 50 μm between the adjacent intermediate portions 163.

  The electrode 16e has a position in the longitudinal direction of the wide portion 161 (direction indicated by an arrow L in the drawing) of one of the two adjacent electrodes 16e in the longitudinal direction of the wide portion 161 of the other electrode 16e. It is provided so that it does not overlap with the position. More specifically, the two adjacent electrodes 16e are oriented in the longitudinal direction opposite to each other, and the wide portion 161 of one electrode 16e is shorter than the narrow portion 162 of the other electrode 16e. Two adjacent electrodes 16e are arranged so as to be aligned in the direction. In this manner, by arranging the wide portions 161 alternately, it is possible to bring the adjacent intermediate portions 163 closer to each other as compared with the case where the wide portions 161 are provided on one side. Thereby, the electrodes 16e can be efficiently collected in the short direction.

  In addition, in the present embodiment, in the two adjacent electrodes 16e, the narrow portion 162 that is a part of the non-wide portion is formed to be narrower in the lateral direction of the electrode 16e than the intermediate portion 163. The bar-shaped electrode 16e is arranged such that the wide portion 161 of one electrode 16e is aligned with the narrow portion 162 of the other electrode 16e in the lateral direction of the electrode. Thereby, in this Embodiment, the some bar-shaped electrode 16e can be more efficiently integrated according to the desired space | gap g in a transversal direction.

  In the present embodiment, in the adjacent electrode 16e, the longitudinal dimension of the narrow part 162 of the other electrode 16e is larger than the longitudinal dimension of the wide part 161 of one electrode. Thereby, interference with the edge part by the side of the narrow part 162 of the intermediate part 163 of the other electrode 16e and the one end part 161 of one electrode 16e can be avoided.

  Returning to FIG. 1, a display wiring portion 17 a is provided on the surface of the other substrate 16 opposite to the one substrate 11 side. The other substrate 16 is formed with a via 18 for passing through the connection wiring portion 17b that connects the electrode 16e and the display wiring portion 17a.

  One display wiring portion 17a and one via 18 are formed for each electrode 16e. In the present embodiment, the via 18 is formed by irradiating the surface of the other substrate 16 opposite to the one substrate 11 with a laser. The via 18 may be formed by punching.

  The via 18 is formed after the electrode 16e is formed on the surface of the other substrate 16 on the one substrate 11 side. When the via 18 is formed by irradiating a laser, since the laser does not pass through the electrode 16e, a through hole is not formed in the electrode 16e, which is advantageous in manufacturing. On the other hand, when the via 18 is formed by punching, a through-hole is also formed in the electrode 16e, but the substrate contamination caused by the substrate material removed by the laser irradiation or the altered material of the substrate reattaches to the substrate. There is an advantage that there is no adverse effect on the wiring material adhesion and electrical performance. In addition, there is an advantage that the cost can be suppressed compared to laser irradiation.

  3A and 3B are enlarged views of the electrode 16e, where FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, the via 18 is formed so as to face the wide portion 161 of the electrode 16e in the thickness direction of the other substrate 16. The connection wiring portion 17b extends from the display wiring portion 17a, passes through the via 18, and is connected to the electrode 16e. Here, in the present embodiment, the display wiring portion 17a and the connection wiring portion 17b are integrated by applying a conductive material from the surface of the other substrate 16 opposite to the one substrate 11 side. And at the same time.

  In the present embodiment, the diameter of the via 18 is set to 70 μm as an example, and since the width dimension W1 of the wide portion 161 is set to 350 μm as described above, the wide portion with respect to the diameter of the via 18 is set. The dimension margin for the width dimension W1 of 161 is 280 μm. Regarding the diameter of the via 18, the dimension margin with respect to the width dimension W <b> 1 of the wide portion 161 is preferably about 150 μm to 600 μm. According to the knowledge of the present inventor, when the other substrate 16 has a width of 400 mm, a dimensional variation of 150 μm occurs. That is, dimensional variation occurs in the range of 399.225 to 400.75 mm. This value is adopted as the lower limit of the preferred range. On the other hand, the upper limit of the preferred range is one employing a pitch of 600 μm with one electrode skipped.

  FIG. 4 is a detailed cross-sectional view of a portion including the electrode 16e. As shown in FIG. 4, in detail, an insulating material is formed so as to fill a gap formed between the display wiring portion 17a 'adjacent to the display wiring portion 17a provided for each electrode 16e. An insulating layer 19 made of is provided. Here, it is preferable that a gap G of 30 μm or more is secured between the adjacent display wiring portions 17a and 17a ′ when viewed in the short direction of the electrode 16e.

  The thickness of the other substrate 16 as described above is preferably 10 μm to 1 mm, similarly to the thickness of the one substrate 11. If it is thinner than 10 μm, the strength as a panel cannot be obtained and the risk of breakage increases. On the other hand, if it is thicker than 1 mm, the panel weight becomes too heavy and the handling becomes inconvenient and the cost also increases. Because. A suitable thickness range that is difficult to break and easy to handle is about 50 μm to 300 μm.

  Further functional layers can be added to the other substrate 16. For example, a barrier film can be attached to the surface of the other substrate 16 opposite to the ink 13. Even if a transparent film in which a barrier layer of a transparent inorganic film is previously formed by vapor deposition or the like is employed as the other substrate 16, the same function as this can be exhibited. Alternatively, an ultraviolet cut film can be attached to the surface of the other substrate 16 opposite to the ink 13. Even if the other surface of the substrate 16 opposite to the ink 13 is subjected to another ultraviolet cut treatment, the same function can be exhibited. As other surface coat layers, an AG layer (antiglare layer), an HC layer (scratch prevention layer), an AR layer (antireflection layer) and the like can be added.

  The other substrate 16 can be applied in either a roll shape or a sheet shape.

<Method for manufacturing reflective display device>
FIG. 5 is a flowchart schematically showing a manufacturing method of the reflective display device of the present embodiment.

  First, as shown in FIG. 5, partition walls 12 are formed in a predetermined pattern on the light transmitting electrode 11e of one substrate 11 having a light transmitting property (partition wall forming step).

  FIG. 6 is a diagram schematically showing an example of the partition wall forming step. As shown in FIG. 6, first, a predetermined pattern is first formed on the upper surface of the electrode of one substrate 11 generally placed in the horizontal direction by, for example, photolithography (exposure by ultraviolet (UV) irradiation → development → firing). The partition wall 12 is formed. The partition wall 12 is a member that defines a plurality of cells to be described later at least in the display region 60.

  The partition wall 12 can be made of an ultraviolet curable resin, a thermosetting resin, a room temperature curable resin, or the like. As a method for forming the partition wall 12, a mold transfer method such as embossing can be adopted in addition to a photolithography method. Further, a method of manufacturing a structure having a desired pattern as a partition and sticking the structure to one substrate 11 may be employed.

  The width of the top surface of the partition wall 12 is 9 μm to 50 μm, preferably 9 μm to 20 μm. 9 μm is the lower limit of the line width at which the partition wall 12 can be patterned without falling down. When the width of the top surface of the partition wall 12 is less than 9 μm, in a pattern in which the length of the partition wall 12 is 60 μm or more, at least a part of the partition wall 12 falls, peels off, or the separated partition wall 12 moves over the substrate. Or move. In that case, the function of preventing the movement of particles by the partition wall 12 is lost, and the display quality is deteriorated. On the other hand, the upper limit of 50 μm, which is the upper limit of the preferred range, is an upper limit at which the partition wall 12 is not too conspicuous when visually observed.

  Here, the definition of the width of the top surface of the partition wall 12 is shown in FIG. If the corners of the top surface are not rounded, the width of the top surface is defined as it is, as shown in FIGS. 7 (a) and 7 (b). On the other hand, when the corner of the top surface is rounded, it is understood as the width between the intersection lines of the extended surface of the top surface and the extended surface of the wall surface, as shown in FIG. 7 (c) and FIG. 7 (d). The As a measuring method for evaluation, one substrate 11 on which the partition wall 12 was formed was embedded in a cured resin, and a cross section of the partition wall 12 was cut out with a microtome (manufactured by Daiwa Koki Kogyo Co., Ltd .: FX-801). Each width can be measured based on an image taken by a scanning electron microscope (SEM).

  The pattern shape of the partition walls 12 is basically arbitrary, such as a circle, a lattice, a honeycomb shape (hexagon), and other polygons. The aperture ratio is preferably 70% or more, and particularly preferably 90% or more. The higher the aperture ratio, the wider the displayable area, so that high contrast can be obtained.

  The height of the partition wall 12 is 5 μm to 50 μm, preferably 10 μm to 50 μm. If the thickness is 5 μm or less, the amount of ink to be filled is small, and sufficient display characteristics, in particular, contrast cannot be obtained. On the other hand, if the thickness is 50 μm or more, the panel is too thick and the drive voltage increases excessively. From the viewpoint of obtaining good display characteristics at a low driving voltage, a height in the range of 10 μm to 50 μm is preferable.

  The cell size (pitch L) depends on the size of the display panel, but is 0.05 to 1 mm, preferably 0.1 to 0.5 mm. Here, the pitch means a distance between the center points of adjacent cells, that is, a distance necessary for moving adjacent cells to overlap each other.

  Next, in the present embodiment, the adhesive layer 22 is formed on the partition wall 12 (adhesive layer forming step). In this adhesive layer forming step, for example, a heat sealing agent such as a polyester-based thermoplastic adhesive is formed with a thickness of 1 μm to 100 μm by a transfer method or a printing method. Preferably, it is formed with a thickness of 1 μm to 50 μm, particularly preferably with a thickness of 1 μm to 20 μm.

If supplemented with typical thermal transfer specific description will be given of an example of a transfer method, as shown in FIG. 8, for example, heat-sealing material such as a polyester-based thermoplastic adhesive in a thickness of 20μm on the PET film 21 22 Is prepared, and the surface of the heat sealant 22 of the transfer film is laminated on the partition wall 12 at room temperature and a pressure of 1 kPa. This is heated for 1 minute on a hot plate maintained at, for example, 120 ° C., which is equal to or higher than the softening temperature of the heat sealant 22, and then the transfer film is peeled off. As a result, an adhesive layer 22 of about 6 μm, for example, is formed on the partition wall 12.

  In order to improve the adhesion between the partition wall 12 and the heat sealant 22, the partition wall 12 may be subjected to surface treatment by ultraviolet irradiation, plasma treatment, or the like, or a primer may be formed. Alternatively, a silane coupling agent may be added to the heat sealing agent 22.

  Next, an outer peripheral seal 61 for surrounding the ink 13 is disposed along the outer periphery of the region where the partition wall 12 is formed (display region 60) (outer peripheral seal disposing step).

  If a specific description is supplemented about an example of the arrangement method of the outer periphery seal 61, the outer periphery seal 61 is made of an adhesive such as an ultraviolet curable resin with a line width of 0.5 mm and a height of 50 μm using a dispenser. It arrange | positions by apply | coating to a shape.

  Next, ink 13 as a fluid display medium is arranged on one substrate 11 (display medium arrangement step). FIG. 9 is a diagram schematically showing an example of the display medium arranging step. Here, (1) the ink 13 is dropped from the dispenser 41, the inkjet, or the die coat (ink dropping step), and (2) the ink 13 is made uniform in the surface by the applicator 42, the doctor blade, the doctor knife, or the central squeegee. It is applied (ink application process). In this state, on the plurality of display areas 60 of one substrate 11, there is an amount of ink 13 that exceeds the volume of each cell, that is, there is a surplus of ink 13. The ink 13 may be disposed on the other substrate 16.

  Examples of the electroresponsive material include a charged particle material and a liquid crystal material. The charged particle material is a so-called electrophoretic material in which colored particles such as white, black, and color move in response to an electric field, or a material typified by a twist ball that is colored in two colors and rotated by the electric field, Alternatively, there are nanoparticle materials that move by an electric field, and the like. On the other hand, the liquid crystal material includes a material for electrically controlling transmission and scattering known as PDLC (Polymer Dispersed Liquid Crystal), a material in which a liquid crystal is mixed with a dye, a cholesteric liquid crystal material, and the like. These materials that have electrical responsiveness and change optical characteristics need to be isolated into cells regardless of the type, and are subject to application of the present invention.

  Thereafter, the adhesive layer 22 on the partition wall 12 is bonded to the other substrate 16 facing the one substrate 11 (opposite substrate bonding step). Thereby, the display medium (ink 13) is sealed (encapsulated) in each cell formed by the partition walls 12.

  The other substrate 16 is prepared with the electrode 16e, the display wiring portion 17a, the connection wiring portion 17b, and the via 18 shown in FIG. 5 and FIG. 10 described later, illustration of the electrode 16e, the display wiring portion 17a, the connection wiring portion 17b, and the via 18 is omitted for convenience of explanation.

  If a specific description is supplemented with respect to an example of the manufacturing process of the other substrate 16, first, the surface of the other substrate 16 on the one substrate 11 side is formed into a bar shape by, for example, a sputtering method using a metal mask. A plurality of electrodes 16e are provided. Here, the wide portion 161 of the bar-shaped electrode 16e is formed wider in the short direction of the electrode 16e than the narrow portion 162 and the intermediate portion 163, and the narrow portion 162 of the bar-shaped electrode 16e. However, it is formed narrower in the short direction of the electrode 16e than the wide portion 161 and the intermediate portion 163. Next, the via 18 is formed by irradiating the laser toward the wide portion 161 of the electrode 16 e from the surface of the other substrate 16 opposite to the surface on the one substrate 11 side. Here, since the wide portion 161 of the bar-shaped electrode 16e is wide, the accuracy margin of the via 18 is ensured, and the via 18 is prevented from opening at an undesired position in the other substrate 16. . Specifically, the via 18 in FIG. 4 is off the center of the wide portion 161, but is located in the wide portion 161, so that conduction with the electrode 16e of the connection wiring portion 17b is ensured. , Does not cause other problems.

  After that, by applying a conductive material from the surface of the other substrate 16 opposite to the one substrate 11, the display wiring portion 17a and the connection wiring portion 17b are formed. Then, the insulating layer 19 as shown in FIG. 4 is formed on the display wiring portion 17a, and the preparation of the other substrate 16 is completed.

  In the counter substrate bonding step, as shown in FIG. 10, the heat sealing agent (adhesive layer 22) and the outer peripheral seal 61 applied as an adhesive layer are heated to obtain an adhesive force. Specifically, while applying a predetermined thermocompression pressure (laminate pressure) by a laminator 91 which is a roller body, the heat sealant 22 and the outer peripheral seal 61 are heated from the periphery to a temperature exceeding the softening temperature to be softened. As a result, the partition wall 12 and the other substrate 16 are bonded.

  Then, the outer periphery seal | sticker 61 is hardened, the outer periphery of the display area 60 is sealed, and the mother panel board | substrate 81 is manufactured.

  Thereafter, as shown in FIG. 5, the mother panel substrate 81 is cut into a predetermined size by a cutting device 51 such as a guillotine, an upper blade slide device, a laser cutting device, a laser cutter, etc., thereby producing a desired reflective display device. Is completed.

  As described above, according to the present embodiment, the wide portion 161 of the bar-shaped electrode 16e is formed wider in the short direction of the electrode 16e than the narrow portion 162 and the intermediate portion 163. Therefore, the accuracy margin of the via 18 can be ensured in the wide portion 161 of the bar-shaped electrode 16e, and the via 18 can be prevented from opening at an undesired position in the other substrate 16.

  FIG. 11 is a diagram for explaining a second embodiment of the present invention. As shown in FIG. 11, in the present embodiment, the wide portion 261 in one electrode 16e of two adjacent electrodes 16e is connected to the narrow portion 262 in the other electrode 16e in the short direction of the electrode 16e ( The electrodes 16e are arranged so as not to line up in the (S direction). Specifically, the narrow portion 262 of the other electrode 16e ends before reaching the wide portion 261 of the one electrode 16e when viewed in the longitudinal direction. In the present embodiment, the width dimension W2 of the narrow portion 262 in the electrode 16e is the same as the width dimension W3 of the intermediate portion 263. In other words, there is no distinction between the narrow portion 262 and the intermediate portion 263. In these respects, the second embodiment is different from the above-described embodiment.

  In such a second embodiment, the narrow portion 262 of the other electrode 16e is aligned in the short direction with respect to the wide portion 261 of one electrode 16e of the two adjacent electrodes 16e. Therefore, it is easy to ensure a wider width dimension W1 of the wide portion 261.

  Next, FIG. 12 is a diagram for explaining a third embodiment of the present invention. As shown in FIG. 12, also in this embodiment, as in the second embodiment, the wide portion 361 in one electrode 16e of two adjacent electrodes 16e is replaced by the narrow portion in the other electrode 16e. The electrode 16e is arranged at 362 so as not to line up in the short direction (S direction) of the electrode 16e. Specifically, the narrow portion 362 of the other electrode 16e ends before reaching the wide portion 361 of the one electrode 16e when viewed in the longitudinal direction. Also in the present embodiment, the width dimension W2 of the narrow part 362 in the electrode 16e is the same as the width dimension W3 of the intermediate part 363. In other words, there is no distinction between the narrow part 362 and the intermediate part 363.

  On the other hand, in the present embodiment, unlike the second embodiment, the wide portion 361 of the electrode 16e is short relative to the intermediate portion 363 instead of projecting to both sides in the short direction relative to the intermediate portion 363. It overhangs only on one side of the direction and is L-shaped as a whole. The two adjacent electrodes 16e make a pair with each other, and the extending direction of each wide portion 361 is a direction toward the counterpart electrode 16e forming a pair.

  In the third embodiment as well, as in the second embodiment, the narrow portion of the other electrode 16e with respect to the wide portion 361 of one electrode 16e of the two adjacent electrodes 16e. Since 362 does not exist side by side in the lateral direction, it is easy to ensure a wider width dimension W1 of the wide portion 361.

  Next, FIG. 13 is a diagram for explaining a fourth embodiment of the present invention. As shown in FIG. 13, also in this embodiment, as in the second and third embodiments, the wide portion 461 in one electrode 16e of the two adjacent electrodes 16e has the other The electrode 16e is arranged so that it does not line up with the narrow part 462 of the electrode 16e in the short direction (S direction) of the electrode 16e. Specifically, the narrow portion 462 of the other electrode 16e ends before reaching the wide portion 461 of the one electrode 16e when viewed in the longitudinal direction. Also in the present embodiment, the width dimension W2 of the narrow portion 462 in the electrode 16e is the same as the width dimension W3 of the intermediate portion 463. In other words, there is no distinction between the narrow portion 462 and the intermediate portion 463.

  Further, in the present embodiment, similarly to the third embodiment, the wide portion 461 of the electrode 16e is short relative to the intermediate portion 463 instead of projecting on both sides in the short direction with respect to the intermediate portion 463. It protrudes only on one side in the hand direction and is L-shaped as a whole. However, unlike the third embodiment, the extending direction of each one end 461 is the same direction.

  In the fourth embodiment as well, as in the second and third embodiments, the other of the two adjacent electrodes 16e with respect to the wide portion 461 of one electrode 16e, the other Since the narrow portion 462 of the electrode 16e does not exist side by side in the lateral direction, it is easy to ensure a wider width dimension W1 of the wide portion 461.

  Next, FIG. 14 is a diagram for explaining a fifth embodiment of the present invention. As shown in FIG. 14, in the present embodiment, the wide portion 561 of the electrode 16e includes an enlarged portion 561a that enlarges the width dimension from the intermediate portion 563 in a tapered shape, and a wide rectangular shape connected to the enlarged portion 561a. And a main body portion 561b. The narrow portion 562 of the electrode 16e includes a reduction portion 562a that reduces the width dimension from the intermediate portion 563 in a tapered shape, and a rectangular narrow main body portion 562b that is connected to the reduction portion 562a. Yes. And between the adjacent electrodes 16e, the enlarged portion 561a and the reduced portion 562a are opposed to each other substantially in parallel. Other points are substantially the same as those of the first embodiment.

  In the fifth embodiment, the same effect as that of the first embodiment can be obtained.

  Next, FIG. 15 is a diagram for explaining a sixth embodiment of the present invention. This embodiment is different from the fifth embodiment in FIG. 14 in that the other end 662 does not have a narrow main body.

  In the sixth embodiment, as in the second embodiment, the other electrode with respect to the wide main body 661b of the wide portion 661 of one electrode 16e of the two adjacent electrodes 16e. Since the narrow body portion 662a of the narrow portion 662 of 16e does not exist side by side in the lateral direction, it is easy to ensure a wider width dimension W1 of the wide body portion 661b of the wide portion 661.

11 One substrate 11e Electrode (translucent electrode)
12 Partition 13 Ink (display medium)
16 Other substrate 16e Electrode 17a Display wiring part 17b Connection wiring part 18 Via 19 Insulating layer 22 Heat seal agent (adhesive layer)
41 Dispenser 42 Applicator 51 Cutting device 60 Display area 61 Peripheral seal 161,261,361,461,561,661 Wide part 162,262,362,462,562,662 Narrow part 163,263,363,463,563 Intermediate part 561a, 661a Enlarged part 561b, 661b Wide body part 562a, 662a Reduced part 562b Narrow body part

Claims (5)

When a display medium containing at least one kind of electrically responsive material is sealed between two opposing substrates, at least one of which is translucent, and a predetermined electric field is applied between the two substrates A reflective display device that performs a desired display,
One substrate has translucency,
On the surface of the other substrate on the one substrate side, a bar-shaped electrode is provided,
A display wiring portion is provided on the surface of the other substrate opposite to the one substrate side,
Vias are formed in the other substrate to pass through the connecting wiring portions that connect the bar-shaped electrodes and the display wiring portions,
A part of the bar-shaped electrode is formed wider than the other part in the short direction of the electrode to form a wide part, and the other part is shorter than the wide part. It is a non-wide part that is not wide in the direction,
The reflective display device, wherein the via is formed so as to overlap the wide portion of the bar-shaped electrode when viewed from the side of the one substrate toward the side of the other substrate. . A plurality of the bar-shaped electrodes are provided so as to be arranged in the short direction of the electrodes,
The position in the longitudinal direction of the electrode of the wide portion in one electrode of the adjacent bar-shaped electrodes does not overlap the position in the longitudinal direction of the electrode of the wide portion in the other electrode, and so on. The reflective display device according to claim 1, wherein a bar-shaped electrode is provided. 3. The bar-shaped electrode is arranged such that the wide portion of the one electrode is aligned with the non-wide portion of the other electrode in the short direction of the electrode. A reflective display device according to 1. The bar-shaped electrode is arranged such that the wide portion of the one electrode is not aligned with the non-wide portion of the other electrode in the short direction of the electrode. 2. A reflective display device according to 2. A part of the non-wide part in the bar-shaped electrode is formed to be narrower in the width direction of the electrode than the other part of the non-wide part, and is a narrow part,
The bar-shaped electrode is arranged such that the wide portion of the one electrode is aligned with the narrow portion of the other electrode in the short direction of the electrode. A reflective display device according to 1.

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