JP2009192627A - Method for manufacturing electrophoresis display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrophoresis display device capable of securing a sealing function without impairing salability of the electrophoresis display device. <P>SOLUTION: The method for manufacturing the electrophoresis display device includes the stages of: sticking an electrophoresis sheet on a display area on a first surface of an element substrate; sticking a connection substrate on a second surface of the element substrate on the opposite side from the first surface; connecting the element electrode and connection electrode together by a wire; pressing a protection substrate from above the electrophoresis sheet after the connection by the wire to stick the protection substrate; disposing a sealing material between the protection substrate and element substrate after sticking the protection substrate; and forming an adhesion layer on the surface of the electrophoresis sheet to be stuck on the protection substrate before sticking the protection substrate. In the stage of forming the adhesion layer, the adhesion layer is formed to a size smaller than the electrophoresis sheet and larger than a display area in plan view of the adhesion layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an electrophoretic display device.

  2. Description of the Related Art There is known an electrophoretic display device in which an electrophoretic sheet in which an electrophoretic substance layer and an adhesive layer are provided on a transparent substrate is attached to a display area of an element substrate provided with elements and circuits. In addition to the elements and circuits, the element substrate is provided with terminals for connecting the elements and circuits to an external electric circuit. (For example, refer to Patent Document 1).

  The external electric circuit generally has a configuration formed on a flexible substrate (FPC), for example, and the terminal of the element substrate and the terminal provided on the FPC are connected via a rectangular conductive film (ACF). The configuration to be known was known. In the case of this configuration, since a sticking allowance of 1.5 mm or more is required for the connection using the ACF, the non-display area is increased correspondingly, and the size reduction of the electrophoretic display device is hindered. there were.

  On the other hand, in order to achieve electrical connection between the element substrate and the external electric circuit, a configuration in which a separate connection substrate is provided on the back surface of the element substrate has been proposed. According to this configuration, the connection electrode on the external electric circuit side is arranged on the connection substrate, and the connection electrode and the terminal on the element substrate are connected by wire bonding or the like. In this configuration, the distance between the connection terminal on the element substrate (about 0.2 mm × 0.2 mm) and the connection electrode on the connection substrate (about 0.2 mm × 0.2 mm) is about 0.1 mm. Since the connection between the distances is sufficient, the length required for the connection is about 0.5 mm, and the connection region can be made very narrow compared to the case of using the ACF.

As described above, an electrophoretic display device including a connection substrate has a connection substrate attached to the back surface of an element substrate to which an electrophoretic sheet is attached, and the element substrate and the connection substrate are connected by wire bonding. After the cover glass is pressed and pasted onto the sheet via an adhesive layer, a sealing member (resin or the like) is filled between the electrophoretic sheet and the cover glass and sealed.
JP 2005-114822 A

  However, in the process of laminating the cover glass in the above manufacturing process, when the cover glass is pressed, the adhesive layer is crushed and spread, and sometimes protrudes outside the electrophoretic sheet. The protruding adhesive layer penetrates into the sealing member and degrades the sealing function of the sealing member. For example, there is a problem that the reliability is lowered due to penetration of moisture or the like.

  On the other hand, it is conceivable to increase the size of the electrophoretic sheet in plan view in consideration of the protrusion of the adhesive layer, but there is also a problem that the electrophoretic display device becomes large.

  In view of the above circumstances, an object of the present invention is to provide a method for manufacturing an electrophoretic display device having excellent reliability.

  In order to achieve the above object, an electrophoretic display device manufacturing method according to the present invention includes a step of attaching an electrophoretic sheet to a display region on a first surface of an element substrate, and a connection substrate as the first of the element substrate. A step of bonding to a second surface opposite to the surface, a step of connecting the element substrate and the connection electrode by a wire, and a connection by pressing the protective substrate from above the electrophoretic sheet after the connection by the wire. A method of manufacturing an electrophoretic display device, comprising: a step of bonding, and a step of disposing a sealing material between the protective substrate and the element substrate after the protective substrate is bonded. Before the alignment, the method further includes a step of forming an adhesive layer on the surface of the electrophoretic sheet to be bonded to the protective substrate. In the step of forming the adhesive layer, the dimensions of the adhesive layer in plan view But Serial smaller than electrophoretic sheet, and characterized by forming the adhesive layer to be larger than the display area.

  The present invention is a manufacturing method for manufacturing an electrophoretic display device one by one. According to the present invention, before the protective substrate is bonded, the method includes the step of forming an adhesive layer on the surface of the electrophoretic sheet that is bonded to the protective substrate. In the step of forming the adhesive layer, Since the adhesive layer is formed so that the dimension in the plan view is smaller than that of the electrophoretic sheet and larger than the display area, the electrophoretic sheet can be obtained without increasing the dimension in the plan view. A margin of spreading of the adhesive layer is secured on the electrophoresis sheet. For this reason, even if it is a case where an adhesive layer spreads when pressing and bonding a protective substrate, it can suppress that an adhesive layer protrudes from an electrophoretic sheet in the range provided with the said margin. Thereby, since the penetration | invasion of the adhesive agent in a sealing member can be reduced, it becomes possible to ensure the sealing performance of a sealing member, and can ensure the reliability of the electrophoretic display apparatus.

  The method for manufacturing an electrophoretic display device according to the present invention includes a step of attaching an electrophoretic sheet to each of a plurality of display areas provided on a first surface of a mother substrate, and a connection portion corresponding to the plurality of display areas. A step of bonding a mother connecting substrate having a second surface to the second surface opposite to the first surface of the mother substrate, and a step of connecting the display regions and the connecting portions corresponding to the display regions by wires. And a step of pressing and bonding the mother protective substrate from above the electrophoretic sheet after connection by the wire, and sealing between the mother protective substrate and the mother substrate after bonding of the mother protective substrate An electrophoretic table comprising a step of disposing a material, and a step of cutting the mother substrate, the mother connection substrate, the mother protective substrate, and the sealing material for each display region A method for manufacturing an apparatus, comprising: a step of forming an adhesive layer on a surface of the electrophoretic sheet to be bonded to the mother protective substrate before the mother protective substrate is bonded, and forming the adhesive layer In the step of performing, the adhesive layer is formed such that the size of the adhesive tank in plan view is smaller than the electrophoretic sheet and larger than the display area.

  The present invention is a manufacturing method for manufacturing an electrophoretic display device by a method called so-called multiple chamfering. According to the present invention, before the mother protective substrate is bonded, the method includes the step of forming an adhesive layer on the surface of the electrophoretic sheet to be bonded to the mother protective substrate, and in the step of forming the adhesive layer, Since the adhesive layer is formed so that the dimension of the layer in plan view is smaller than that of the electrophoretic sheet and larger than each display area, the dimension of the electrophoretic sheet in plan view need not be increased. In this case, a margin for spreading the adhesive layer is secured on the electrophoretic sheet. For this reason, even if it is a case where an adhesive layer spreads when pressing and bonding a mother protective substrate, it can suppress that an adhesive layer protrudes from an electrophoretic sheet in the range provided with the said margin. Thereby, since the penetration | invasion of the adhesive agent in a sealing member can be reduced, it becomes possible to ensure the sealing performance of a sealing member, and can ensure the reliability of the electrophoretic display apparatus.

In the method for manufacturing an electrophoretic display device, the electrophoretic sheet is formed in a rectangular shape in a plan view, and in the step of forming the adhesive layer, the adhesive layer overlaps each corner of the electrophoretic sheet. It is arranged so that it may be arranged.
The present inventor has found that, when the protective substrate or the mother protective substrate is pressed, the corner of the electrophoretic sheet in the adhesive layer is smaller than the other portions. Therefore, in the present invention, the adhesive layer is arranged so as to overlap each corner of the electrophoretic sheet. Accordingly, since the protective substrate or the mother protective substrate can be adhered at each corner of the electrophoretic sheet, the protective substrate or the mother protective substrate can be securely bonded.

In the method of manufacturing the electrophoretic display device, in the step of forming the adhesive layer, the adhesive layer is arranged so as to be curved inward with respect to each side of the electrophoretic sheet.
The present inventor has found that when the protective substrate or the mother protective substrate is pressed, the portion of the adhesive layer along each side of the electrophoretic sheet has a larger spread than the other portions. Therefore, in the present invention, the adhesive layer is arranged to be curved inward with respect to each side of the electrophoretic sheet. As a result, a larger margin can be ensured in the portion where the adhesive layer is likely to spread, so that the protrusion of the adhesive layer can be prevented more reliably.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a schematic configuration of an electrophoretic display device 1 according to the present embodiment. FIG. 2 is a diagram showing a configuration along the section AA in FIG.

As shown in FIGS. 1 and 2, the electrophoretic display device 1 includes an element substrate 2, an electrophoretic sheet 3, a cover glass 4, and a connection substrate 8, and the surface (first surface) of the element substrate 2. The electrophoresis sheet 3 is affixed, a cover glass 4 is disposed on the surface of the electrophoresis sheet, and a connection substrate 8 is disposed on the back surface (second surface) of the element substrate 2.
The electrophoretic display device 1 is provided with a display area 5 for displaying images such as still images and moving images. A plurality of pixels arranged in a matrix are provided in the display area 5, and display is performed for each pixel. A region 6 around the display region 5 is a non-display region where no image is displayed. The non-display area 6 is not provided with pixels, and is provided with drive circuit elements 22 and 23, a terminal 24, and the like.

  The element substrate 2 includes a substrate 20 and a drive layer 21 including a pixel electrode and the like formed on the substrate. Examples of the substrate 20 include inorganic substrates such as a glass substrate, a quartz substrate, a silicon substrate, and a gallium arsenide substrate, polyimide, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), and polycarbonate (PC). A plastic substrate (resin substrate) composed of polyethersulfone (PES), aromatic polyester (liquid crystal polymer), or the like can be used. A drive layer 21 is formed in an area corresponding to the display area 5 in the substrate 20. In the drive layer 21, pixel electrodes and switching elements provided in each pixel, data lines and scanning lines connected to the switching elements, and the like are formed. A planar formation region of the drive layer 21 substantially coincides with the display region 5, and the drive circuit elements 22 and 23 are provided in the peripheral portion (non-display region 6) of the drive layer 21. The drive circuit elements 22 and 23 are electrically connected to data lines and scanning lines, and supply signals to the drive layer 21. A plurality of terminals 24 are provided at the end of the element substrate 2 (right end in the drawing), and are connected to the drive circuit elements 22 and 23 by wiring (not shown) formed on the element substrate 2.

  The connection substrate 8 is attached to the back surface 20b of the substrate 20. The connection substrate 8 includes a core member 8a made of, for example, glass epoxy, and a connection electrode 8b provided on the core member 8a. The core member 8 a is a rectangular plate-like member attached to the back surface 20 b of the substrate 20 so that one side extends from the substrate 20. The connection electrode 8b is made of metal such as copper or gold, for example, and a plurality of connection electrodes 8b are provided along the protruding one side of the core member 8a. The core member 8a is affixed so as to cover the entire back surface 20b of the substrate 20. The connection electrode 8b is connected to a terminal 24 provided on the surface 20a of the substrate 20 via a wire 10 made of metal such as gold or aluminum.

The electrophoretic sheet 3 has a transparent substrate 30 and an electrophoretic layer 31.
The transparent substrate 30 is a substrate that holds the electrophoretic layer 31, and is a rectangular substrate made of a material having high light transmittance, such as polyethylene terephthalate (PET), polyethersulfone (PES), polycarbonate (PC), and the like. The surface 30 a side of the transparent substrate 30 is the display surface side of the electrophoretic display device 1. A common electrode (not shown) is formed on almost the entire inner surface 30b of the transparent substrate 30. The common electrode is made of a conductive material having high optical transparency such as ITO, and is connected to the element substrate 2 by the vertical conduction member 9.

The electrophoretic layer 31 has a plurality of microcapsules (electrophoretic substance layers) 32 and an adhesive layer 33.
The microcapsule 32 is a substantially spherical capsule in which an electrophoretic dispersion is enclosed, and the diameter of each capsule is substantially the same (50 μm to 100 μm). Examples of the material for forming the capsule wall film of the microcapsule 32 include compounds such as a gum arabic / gelatin composite film, urethane resin, urea resin, and urea resin. The electrophoretic dispersion liquid enclosed in the microcapsule 32 includes a plurality of electrophoretic particles and a liquid layer dispersion medium for dispersing the electrophoretic particles.

  Examples of the liquid layer dispersion medium include water, alcohol solvents, various esters, ketones, aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, carboxylates, and other various oils. These can be used alone, or a mixture of these with a surfactant or the like.

  As the electrophoretic particles, organic or inorganic particles (polymer or colloid) having a property of moving by electrophoresis due to a potential difference in a liquid phase dispersion medium can be used. Specifically, black pigments such as carbon black and aniline black, white pigments such as titanium dioxide, monoazo azo pigments, yellow pigments such as isoindolinone, monoazo azo pigments, red pigments such as quinacridone red, phthalocyanine One or more of blue pigments such as blue and green pigments such as phthalocyanine green can be used. These pigments include electrolytes, surfactants, metal soaps, resins, rubbers, oils, varnishes, charge control agents composed of particles such as compounds, titanium-based coupling agents, aluminum-based coupling agents, silanes as necessary. A dispersant such as a system coupling agent, a lubricant, a stabilizer, and the like can be added.

  In the microcapsule 32, for example, two types of electrophoretic particles of titanium dioxide which is a white pigment and carbon black which is a black pigment are encapsulated, one of which is negatively charged and the other of which is positively charged. Of course, other electrophoretic particles may be used, or only one type of electrophoretic particle may be used, and the electrophoretic particles may be moved to the common electrode side or the pixel electrode side so that display can be performed.

  The adhesive layer 33 is an adhesive that also serves as a binder. The adhesive layer 33 is preferably an adhesive having good affinity for the capsule wall film of the microcapsule 32, excellent adhesion to the common electrode and the pixel electrode, and good insulation. An adhesive that is elastic even after curing is preferred.

  As the cover glass 4, glass having high light transmittance, excellent flatness, and hardly scratched is suitable. Specifically, inorganic glass, crystal glass, or the like can be used. Further, sapphire glass or acrylic glass may be used. The cover glass 4 and the electrophoretic sheet 3 are fixed by a transparent adhesive layer 11 such as a double-sided tape. A sealing material 7 is provided between the cover glass 4 and the element substrate 2. Examples of the material constituting the sealing material 7 include epoxy-based, acrylic-based, and silicon-based resins. In this embodiment, the sealing material 7 is formed of an epoxy resin. The sealing material 7 is provided so as to cover the core member 8 a and the connection electrode 8 b of the connection substrate 8 and to cover the entire wire 10, and the portion constituting the connection between the element substrate 2 and the connection substrate 8 is the sealing material. 7 is covered.

  The electrophoretic layer 31 is sandwiched between the element substrate 2 and the transparent substrate 30 and covered with the cover glass 4 and the connection substrate 8. Furthermore, since the peripheral edge portion of the electrophoretic layer 31 is sealed with the sealing material 7, it is configured to reliably prevent moisture from entering the layer. Thereby, it becomes possible to prevent the malfunction of the electrophoretic layer 31 due to the ingress of moisture, and it is possible to prevent the display quality from deteriorating.

Next, the operation of the electrophoretic display device 1 configured as described above will be briefly described.
When a voltage is applied between the pixel electrode and the common electrode so that the voltage of the common electrode becomes relatively high, the positively charged black electrophoretic particles are moved to the pixel electrode side in the microcapsule 32 by the Coulomb force. Be drawn to. On the other hand, negatively charged white electrophoretic particles are attracted to the common electrode side in the microcapsule 32 by Coulomb force. As a result, white electrophoretic particles gather on the transparent substrate 30 side in the microcapsule 32, and the color (white) of the white electrophoretic particles is displayed in the display area 5 of the electrophoretic display device 1. The Rukoto.

  Conversely, when a voltage is applied such that the potential of the pixel electrode is relatively higher than the common electrode, the negatively charged white electrophoretic particles are attracted to the pixel electrode side by the Coulomb force. On the other hand, the positively charged black electrophoretic particles are attracted to the common electrode side by the Coulomb force. As a result, black electrophoretic particles gather on the transparent substrate 30 side in the microcapsule 32, and the color (black) of the black electrophoretic particles is displayed in the display area 5 of the electrophoretic display device 1. It will be.

  Next, a method for manufacturing the electrophoretic display device 1 configured as described above will be described. In this embodiment, an assembly of a plurality of electrophoretic display panels is formed, the assembly is disposed on a dicing tape, and the assembly is cut by a dicing blade or the like, so that the plurality of electrophoretic display devices 1 are separated. An explanation will be given by taking a so-called multi-chamfering method as an example.

FIG. 3 is a process diagram showing an aspect of the manufacturing process of the electrophoretic display device.
First, as shown in FIG. 3, a plurality of panel regions P are formed on the surface 40 a of the mother substrate 40. Of each panel region P, pixel electrodes, switching elements, and the like are formed in the display region 5, and the driving circuit elements, terminals 24, wirings, and the like are formed in the non-display region 6. Each one of the panel regions P becomes one electrophoretic display device 1.

  After forming the panel area P, the electrophoretic sheet 3 is pasted on the display area 5 of each panel area P as shown in FIG. An adhesive layer 11 is formed in advance on the surface 30 a of the transparent substrate 30 of the electrophoretic sheet 3.

FIG. 10 is a process diagram showing an aspect of the manufacturing process of the electrophoretic display device. FIG. 10A shows a state in which the adhesive 11 is applied to a single electrophoresis sheet 3. FIG. 10B shows an aspect of the adhesive 11 after the mother protective substrate 44 is pasted on the electrophoretic sheet 3.
As shown in FIG. 10A, the adhesive layer 11 is formed along the four sides of the transparent substrate 30 in plan view, and the corner portions 11 a of the adhesive layer 11 overlap each corner of the transparent substrate 30. Form. Further, the corner portions 11 a of the adhesive layer 11 (side portions 11 b) are formed so as to be curved toward the center of the transparent substrate 30 in plan view with respect to each side of the transparent substrate 30. The side portion 11 b is formed so as to be arranged outside the region overlapping the display region 5. In this way, the adhesive layer 11 is formed in a state that is larger than the dimension of the display region 5 in plan view and smaller than the dimension of the electrophoretic sheet 3 in plan view.
Note that the adhesive layer 11 is formed, for example, by printing an adhesive by a silk printing method using a mask having an opening in the region of the adhesive layer 11 indicated by hatching in FIG. be able to. Alternatively, it may be applied by a controlled dispenser programmed to scan the area. Alternatively, printing may be performed by an inkjet discharge device that is similarly scan-controlled.
Moreover, as the adhesive layer 11, a material excellent in transparency is suitable, and for example, an epoxy-based, silicon-based, rubber-based adhesive or the like can be used. Further, an ultraviolet effect type adhesive may be used.

  After the electrophoresis sheet 3 is attached, the mother connection substrate 41 is attached to the back surface 40b of the mother substrate 40 via an adhesive tape or the like as shown in FIG. The terminals 8b of the mother connection board 41 are aligned and pasted so that the terminals 8b of the mother board 40 are exposed to the upper and lower sides in the figure.

  After the mother connection substrate 41 is attached, the terminals 24 on the mother substrate 40 and the connection electrodes 8b on the mother connection substrate 41 are connected by wires 10 as shown in FIG.

  After the connection by the wire 10, as shown in FIG. 7, the mother protective substrate 44 is pressed and bonded to the adhesive layer 11 from above the electrophoretic sheet 3. For example, a total of two mother protection substrates 44 are bonded together, one for the upper row of the panel area in the drawing and one for the lower row of the panel area in the drawing. Examples of pressing of the mother protective substrate 44 include pressurization using a roll and pressurization using a vacuum laminator. The mother protective substrate 44 is disposed so as to cover the electrophoretic sheet 3 and the portion bonded by wire bonding. When the mother protective substrate 44 is pressed, the adhesive layer 11 on the electrophoretic sheet 3 is crushed and spreads over almost the entire surface 30a of the transparent substrate 30, as shown in FIG. It extends to the edge of the substrate 30.

  After the mother protective substrate 44 is bonded, a sealing material 42 is sealed between the mother protective substrate 44 and the mother substrate 40 as shown in FIG. Examples of the material constituting the sealing material 42 include an epoxy resin. For example, the epoxy resin is filled using a dispenser, and the sealing material 42 is sealed by the epoxy resin spreading between the mother protective substrate 44 and the mother substrate 40 by a capillary force. The sealing material 42 is formed on almost the entire surface of the panel region P, such as between the electrophoretic sheets 3 or a portion connected by wire bonding.

After forming the sealing material 42, the sealing material 42 is heated and solidified. By solidifying the sealing material 42, the mother protective substrate 44 that is in contact with the sealing material 42 and the mother protective substrate 44 are fixed in a bonded state. As the sealing material 42, in addition to an epoxy-based material, a silicon-based or rubber-based filler (adhesive) can be used. Further, a UV effect type filler (adhesive) may be used.
After the sealing material 42 is cured, the mother connection substrate 41, the mother substrate 40, the sealing material 42, and the mother protection substrate 44 are cut by a cutting member such as a dicing blade (not shown). After these cuttings, individual electrophoretic display devices 1 are obtained.

  Thus, according to the present embodiment, before the mother protective substrate 44 is bonded, the adhesive layer 11 is applied to the surface (the surface 30a of the transparent substrate 30) bonded to the mother protective substrate 44 of the electrophoretic sheet 3. When the adhesive layer 11 is formed, the adhesive layer 11 is formed so that the size of the adhesive layer 11 in plan view is smaller than that of the electrophoretic sheet 3 and larger than each display region 5. As a result, a margin for the spread of the adhesive layer 11 is secured on the electrophoretic sheet 3 without increasing the size of the electrophoretic sheet 3 in plan view. For this reason, even if the adhesive layer 11 is spread when the mother protective substrate 44 is pressed and bonded, it is possible to prevent the adhesive layer 11 from protruding from the electrophoretic sheet 3 within the range where the margin is provided. . As described above, by forming the adhesive layer 11 on the assumption that the mother protective substrate 44 is spread by pressing, the sealing function can be ensured without impairing the merchantability of the electrophoretic display device 1.

  Further, the present inventors have found that when the mother protective substrate 44 is pressed, the corner portion of the electrophoretic sheet 3 in the adhesive layer 11 has a smaller spread than other portions. Therefore, in the present embodiment, the adhesive layer 11 is configured to be disposed so as to overlap each corner of the electrophoretic sheet 3. Thereby, since the mother protective substrate 44 can be adhered at each corner of the electrophoretic sheet 3, the mother protective substrate 44 can be securely bonded.

  In addition, the present inventor has found that when the mother protective substrate 44 is pressed, the portion 11b along each side of the electrophoretic sheet 3 in the adhesive layer 11 is larger than the other portions. Therefore, in the present invention, the adhesive layer 11 is arranged so as to be curved inward with respect to each side of the electrophoretic sheet 3. As a result, a larger margin can be ensured in the portion where the adhesive layer 11 is likely to spread, so that the protrusion of the adhesive layer 11 can be prevented more reliably. Thereby, since the penetration | invasion of the contact bonding layer 11 in the sealing material 42 can be reduced, it becomes possible to ensure the sealing performance of the sealing material 42, and ensure the expected reliability of the electrophoretic display device 1. FIG. be able to.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, an example in which the electrophoretic display device 1 is manufactured by a so-called multi-chamfering method has been described. However, the present invention is not limited to this, and the electrophoretic display device 1 is manufactured individually one by one. Even in this case, the present invention can be applied.

  In this case, the electrophoretic sheet 3 is attached to the display area 5 on the surface of the element substrate 2, the connection substrate 8 is attached to the back surface of the element substrate 2, the element substrate 2 and the connection electrode 8b are connected by the wire 10, After the connection by the wire, the cover glass 4 is pressed and bonded from above the electrophoretic sheet 3. After the cover glass 4 is bonded, the sealing material 7 is disposed between the cover glass 4 and the element substrate 2. Thus, the electrophoretic display device 1 is manufactured. Before the cover glass 10 is bonded, the adhesive layer 11 is formed on the surface of the electrophoresis sheet 3 to be bonded to the cover glass 4 as shown in FIG. The adhesive layer 11 is formed so that the dimension of the planar view 11 is smaller than the electrophoretic sheet 3 and larger than the display area 5.

  Moreover, when pressing the cover glass 4, you may comprise so that the contact bonding layer 11 may be arrange | positioned so that it may overlap with each corner | angular part of the electrophoresis sheet 3 similarly to the said embodiment. Thereby, since the mother protective substrate 44 can be adhered at each corner of the electrophoretic sheet 3, the mother protective substrate 44 can be securely bonded.

  Moreover, when pressing the cover glass 4, it comprised so that the contact bonding layer 11 might be arrange | positioned so that it might curve inside with respect to each edge | side of the electrophoresis sheet 3, similarly to the said embodiment. As a result, a larger margin can be ensured in the portion where the adhesive layer 11 is likely to spread, so that the protrusion of the adhesive layer 11 can be prevented more reliably.

  Moreover, in the said embodiment, although the constituent material of the sealing material 7 and the spacer layer 42 was an epoxy resin, it is not restricted to this, The other material containing the material quoted in the said embodiment is used as a constituent material. Of course.

  In addition, by opening a through hole in the center of the display area 5 of the electrophoretic display device 1 of the above embodiment, the electrophoretic display device 1 can be used as a display unit of other electronic devices such as a watch. . In this case, it is preferable to form the through hole before cutting after forming the sealing material 42 and drying it in the manufacturing process.

1 is a plan view showing a configuration of an electrophoretic display device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing the configuration of the electrophoretic display device according to the embodiment. FIG. 5 is a process diagram illustrating a manufacturing process of an electrophoretic display device. The process drawing. The process drawing. The process drawing. The process drawing. The process drawing. The process drawing. The process drawing.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Electrophoretic display device 2 ... Element substrate 3 ... Electrophoresis sheet 4 ... Cover glass 5 ... Display area 6 ... Non-display area 7 ... Sealing material 8 ... Connection board 10 ... Wire 11 ... Adhesive layer 30 ... Transparent substrate 31 ... Electrophoresis layer 40 ... Mother board 41 ... Mother connection board 42 ... Spacer layer 44 ... Mother protection board

Claims (4)

Attaching an electrophoretic sheet to a display area on the first surface of the element substrate;
Bonding a connection substrate to a second surface opposite to the first surface of the element substrate;
Connecting the element substrate and the connection electrode with a wire;
After connecting with the wire, pressing and bonding a protective substrate from above the electrophoretic sheet; and
After bonding the protective substrate, placing a sealing material between the protective substrate and the element substrate;
A method for manufacturing an electrophoretic display device comprising:
Before bonding the protective substrate, further comprising a step of forming an adhesive layer on the surface of the electrophoretic sheet bonded to the protective substrate;
In the step of forming the adhesive layer, the adhesive layer is formed such that the size of the adhesive layer in plan view is smaller than the electrophoretic sheet and larger than the display area. Manufacturing method of electrophoretic display device. Attaching an electrophoretic sheet to each of a plurality of display areas provided on the first surface of the mother substrate;
Bonding a mother connection substrate having a connection portion corresponding to the plurality of display regions to a second surface opposite to the first surface of the mother substrate;
Connecting each of the display areas and the connection portion corresponding to the display area by wires,
After connecting with the wire, pressing and bonding the mother protective substrate from above the electrophoresis sheet; and
After bonding the mother protection substrate, a step of disposing a sealing material between the mother protection substrate and the mother substrate;
Cutting the mother substrate, the mother connection substrate, the mother protective substrate, and the sealing material for each display region, and a method for manufacturing an electrophoretic display device,
Before bonding the mother protective substrate, further comprising the step of forming an adhesive layer on the surface of the electrophoresis sheet to be bonded to the mother protective substrate;
In the step of forming the adhesive layer, the adhesive layer is formed such that the size of the adhesive tank in plan view is smaller than the electrophoretic sheet and larger than the display area. Manufacturing method of electrophoretic display device. The electrophoresis sheet is formed in a rectangular shape in plan view,
The electrophoretic display device manufacturing method according to claim 1, wherein, in the step of forming the adhesive layer, the adhesive layer is disposed so as to overlap each corner of the electrophoretic sheet. Method. The electrophoretic display device manufacturing method according to claim 3, wherein in the step of forming the adhesive layer, the adhesive layer is arranged to be curved inward with respect to each side of the electrophoretic sheet. Method.

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