JP2009186668A - Electrophoretic display, assembly of electrophoretic display panel, and method of manufacturing electrophoretic display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophoretic display of high reliability, to provide an assembly of electrophoretic display panels, and to provide a method of manufacturing the electrophoretic display. <P>SOLUTION: The electrophoretic display is bonded with an electrophoretic sheet provided with an electrophoretic material layer and an adhesive layer in the first substrate, onto a display area of the first face out of the second substrate provided with an element, the electrophoretic display includes a connection substrate provided on the second face, of the second substrate, in an opposite side opposite to the first face, and having a connection electrode electrically connected to the second substrate via a wire, and the connection substrate is provided to cover an area excepting at least one part out of an area overlapped with the element and the display area in top view. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrophoretic display device, an assembly of electrophoretic display panels, and a method for manufacturing the electrophoretic display device.

  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 an element substrate provided with elements, circuits, and the like. A terminal connected to the element and the circuit is provided on the element substrate, and the terminal is connected to an external electric circuit via the terminal (for example, see Patent Document 1).

  As an external electric circuit, for example, a configuration formed on a flexible substrate (FPC) is generally used, and a terminal of an element substrate and a terminal provided on the FPC are interposed via an anisotropic conductive film (ACF). The configuration to be connected was known. The connection via the ACF requires a sticking allowance of 1.5 mm or more, so that the non-display area becomes large correspondingly, and there is a problem that the miniaturization of the electrophoretic display device is hindered.

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 has been proposed. In this configuration, a connection electrode connected to the outside is disposed on the connection substrate, and the connection electrode and an element on the element substrate are connected by wire bonding or the like. In this configuration, a distance of about 0.1 mm between the connection region on the element substrate (region of about 0.2 mm) and the connection region on the connection substrate (region of about 0.2 mm) is connected in a plane. Therefore, the length of the wire required for connection is about 0.5 mm, and the connection area can be made very narrow compared to the case where ACF is used.
JP 2005-114822 A

  However, in the above-described wire bonding configuration, the connection substrate covers almost the entire back surface of the element substrate. Therefore, after assembling the electrophoretic display device, the state of the element substrate cannot be observed from the back side. There's a problem. For example, by observing the state of the elements and the display area on the element substrate before shipping, it may be possible to find defects in the elements and the display area. Reliability may be reduced.

  In view of the circumstances as described above, an object of the present invention is to provide a highly reliable electrophoretic display device, an assembly of electrophoretic display panels, and a method for manufacturing the electrophoretic display device.

  In order to achieve the above object, an electrophoretic display device according to the present invention includes an electrophoretic sheet in which an electrophoretic material layer and an adhesive layer are provided on a first substrate. An electrophoretic display device bonded to a display area of a surface, provided on a second surface of the second substrate opposite to the first surface, and electrically connected to the second substrate via a wire. The connection board is provided so as to cover a region excluding at least a part of a region overlapping the element and the display region in a plan view.

  According to the present invention, since at least a part of the region of the second substrate in which the element is provided in plan view is not covered with the connection substrate, the element is provided even when the connection substrate is attached. The state of the display area can be confirmed from the second surface side of the second substrate. Thereby, since the presence or absence of damage to the element or the display area can be confirmed before shipment, the quality of the electrophoretic display device can be ensured.

  In the electrophoretic display device according to the present invention, an electrophoretic sheet in which an electrophoretic material layer and an adhesive layer are provided on a first substrate is bonded to a display area on a first surface of a second substrate on which elements are provided. An electrophoretic display device comprising: a connection substrate having a connection electrode provided on a second surface opposite to the first surface of the second substrate and electrically connected to the element through a wire. And the connection substrate is provided so that at least a part of the region overlapping the element and the display region in a plan view is detachable.

  According to the present invention, since at least a part of the area where the element and the display area are provided in the plan view in the second substrate is provided so as to be removable, the connection board is attached by removing the part. Even so, the state of the element and the display region can be confirmed from the second surface side of the second substrate. Thereby, since the presence or absence of damage to the element or the display area can be confirmed before shipment, the quality of the electrophoretic display device can be ensured.

In the electrophoretic display device, the connection substrate is provided with a groove portion along the detachable region.
According to the present invention, since the groove portion is provided along the detachable region in the connection substrate, the connection substrate can be easily removed using the groove portion as a guide.

In the electrophoretic display device, a plurality of pixels are provided in the display area of the second substrate, a pixel electrode is provided for each of the plurality of pixels, and a switching element is provided for each of the pixel electrodes. The element is a drive circuit that drives the switching element.
According to the present invention, a plurality of pixels are provided in the display area of the second substrate, a pixel electrode is provided for each of the plurality of pixels, and a switching element is provided for each of the pixel electrodes. Since the driving circuit drives the element, the state of the driving circuit can be confirmed from the second substrate side. Thereby, when there is a problem in the state of the drive circuit, it can be confirmed before shipment.

  The assembly of the electrophoretic display panel according to the present invention has a mother substrate in which a plurality of display areas are provided and an element is formed for each display area, and an electrophoretic substance layer and an adhesive layer are formed on a protective substrate. The electrophoretic display panel is an assembly of electrophoretic display panels bonded to the first surface of the mother substrate for each display area, and is provided on the second surface opposite to the first surface of the mother substrate. A mother connection substrate having a connection electrode electrically connected to each of the electrophoretic sheets via a wire, and the mother connection substrate includes at least one of regions overlapping the element and the display region in plan view. A part is provided to be removable.

  An assembly of electrophoretic display panels in which an electrophoretic sheet is bonded to each display area of a mother substrate provided with a plurality of display areas and elements is cut into each display area to obtain an individual electrophoretic display panel (electrical display panel). Electrophoretic display device). According to the present invention, in the assembly of the electrophoretic display panel, at least a part of the area of the mother substrate where the elements are provided in plan view is not covered with the mother connection substrate. Even in the state where the substrate is attached, the state of the element and the display region can be confirmed from the second surface side of the mother substrate. Accordingly, since it is possible to confirm whether or not the element or the display area is damaged before cutting the assembly of the electrophoretic display panel, the electrophoretic display device formed by cutting the assembly of the electrophoretic display panel It is possible to ensure quality.

The assembly of the electrophoretic display panel is characterized in that the mother connection substrate is provided with a groove portion along the removable region.
According to the present invention, since the groove portion is provided along the removable region in the mother connection board, the mother connection board can be easily removed using the groove portion as a guide.

In the electrophoretic display panel assembly, in the region between the display regions of the mother connection substrate, at least one of the surface on the mother substrate side and the surface on the opposite side of the mother substrate is provided on the mother connection substrate. A support portion for supporting the connection substrate is provided.
According to the present invention, the region between the display areas of the mother connection board is provided with the support portion that supports the mother connection board on at least one of the surface on the mother board side and the surface opposite to the mother board. Therefore, when the mother board and the mother connection board are cut, the support portion supports the mother board. For this reason, it can prevent that a notch part (chipping) will be formed in a mother board | substrate in the case of a cutting | disconnection.

In the assembly of the electrophoretic display panel, a wiring layer connected to the connection electrode is provided on the mother connection substrate, and the wiring layer also serves as the support portion.
According to the present invention, the mother connection board is provided with the wiring layer connected to the connection electrode, and the wiring layer also serves as the support portion, so that the space on the mother connection board can be used without waste. can do.

The assembly of the electrophoretic display panel is characterized in that a portion of the wiring layer disposed between the display areas is electrically grounded.
According to the present invention, since the portion of the wiring layer disposed between the display areas is electrically grounded, even if static electricity is generated during cutting, the wiring layer is electrically grounded. The wiring layer can counteract the influence of static electricity.

  In the method for manufacturing an electrophoretic display device according to the present invention, a plurality of display regions and elements are formed on a first surface of a mother substrate, and a mother connection substrate having connection electrodes corresponding to the plurality of display regions is used as the mother substrate. Is bonded to the second surface opposite to the first surface, an electrophoretic sheet is bonded to the first surface of the mother substrate for each display region, and the display region and the connection corresponding to the display region Electrodes are connected to each other by wires, and at least a part of the connection substrate that overlaps the element and the display region in plan view is removed, and the mother substrate and the mother connection substrate are cut for each display region It is characterized by doing.

  According to the present invention, since at least a part of the area overlapping the element and the display area in plan view is removed from the mother connection board to be bonded to the mother board, a part of the element and the display area are mother-connected. It will not be covered by the substrate. For this reason, the state of an element and a display area can be confirmed from the mother connection substrate side.

  In the method for manufacturing an electrophoretic display device according to the present invention, a plurality of display regions and elements are formed on a first surface of a mother substrate, and a mother connection substrate having connection electrodes corresponding to the plurality of display regions is used as the mother substrate. Is bonded to the second surface opposite to the first surface, an electrophoretic sheet is bonded to the first surface of the mother substrate for each display region, and the display region and the connection corresponding to the display region The electrodes are connected to each other by wires, and at least a part of the connection substrate that overlaps the element and the display region in plan view is processed so as to be removable from other parts, and the mother The substrate and the mother connection substrate are cut for each display region.

  According to the present invention, since the mother connection board to be attached to the mother board is processed so that at least a part of the area overlapping the element and the display area in a plan view can be removed from the other parts. By removing the part, an electrophoretic display device capable of confirming the state of the element and the display region from the mother connection substrate side can be manufactured.

In the method for manufacturing an electrophoretic display device, a support portion for supporting the mother connection substrate is provided on at least one of the first surface and the second surface at a boundary between the display regions of the mother connection substrate. The mother connection board is cut while the mother connection board is supported by the support portion.
According to the present invention, at the boundary between the display areas of the mother connection substrate, the support portion that supports the mother connection substrate is provided on at least one of the first surface and the second surface, and the mother connection substrate is provided at the support portion. Since the mother connection substrate is cut in a supported state, it is possible to prevent a notch (chipping) from occurring in the mother substrate during cutting.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described 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, and a cover glass 4. The electrophoretic sheet 3 is bonded to the element substrate 2 and the electrophoretic sheet 3 is placed on the electrophoretic sheet 3. The cover glass 4 is arranged. 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 rectangular substrate 20 on which electrodes, elements, wirings, and the like for driving the electrophoretic display device 1 are provided. Examples of the substrate 20 include a glass substrate, a quartz substrate, a silicon substrate, a gallium arsenide substrate, polyimide, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), polycarbonate (PC), and polyethersulfone. Examples thereof include a plastic substrate (resin substrate) composed of (PES), aromatic polyester (liquid crystal polymer) and the like. 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. The drive circuit elements 22 and 23 are provided in a region outside 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 terminal 24 is connected to an external electric circuit (not shown), for example.

  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. Further, the appearance is covered with a green resist, and the transparency is poor. The core member 8 a is a rectangular plate-like member attached to the back surface 20 b of the substrate 20 so as to protrude from the substrate 20. The connection electrode 8b is made of a metal such as copper or gold, and a plurality of connection electrodes 8b are provided along one side of the core member 8a. The connection electrode 8b is connected to a terminal 24 provided on the surface 20a of the substrate 20 through a wire 10 made of a metal such as gold or aluminum.

FIG. 3 is a plan view showing a configuration when the electrophoretic display device 1 is viewed from the back side (the side opposite to the display side).
As shown in FIGS. 2 and 3, the core member 8 a is attached so as to cover a part of the back surface 20 b of the substrate 20. Specifically, it is provided so as to cover the range from the right end of the substrate 20 to the front of the drive circuit 22 in the figure, and the display area 5 and the drive circuit elements 22 and 23 are not covered. For this reason, as shown in FIG. 3, the display region 5 and the drive circuit elements 22 and 23 can be observed from the back surface 20 b side of the substrate 20. In addition, the core member 8a does not have optical transparency, and the state of the element substrate 2 cannot be confirmed in a portion of the element substrate 2 covered with the core member 8a.

Returning to FIGS. 1 and 2, 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 electrophoretic particles and a liquid layer dispersion medium in which the electrophoretic particles are dispersed.

  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 a thermosetting 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. Moreover, although it is a thermosetting type, the adhesive agent which has elasticity after hardening is preferable.

  As the cover glass 4, glass having high light transmittance, excellent flatness, and hardly scratched is suitable. Specifically, inorganic glass or crystal glass can be used. Further, sapphire glass or acrylic glass may be used. The cover glass 4 and the electrophoretic sheet 3 are fixed with a transparent adhesive 11. 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. The sealing material 7 is provided so as to cover a part of the core member 8 a and the connection electrode 8 b of the connection substrate 8 and also to cover the entire wire 10, and the part constituting the connection between the element substrate 2 and the connection substrate 8 is It is in a state covered with the sealing material 7.

  The electrophoretic layer 31 is sandwiched between the element substrate 2 and the transparent substrate 30 and is covered with the cover glass 4, and the peripheral portion is sealed with the sealing material 7. Since the electrophoretic layer 31 that dislikes moisture is covered in this way, it is possible to reliably prevent moisture from entering.

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 is relatively high, the positively charged black electrophoretic particles are moved to the pixel electrode side in the microcapsule 32 by the Coulomb force. Gravitate. 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 between the pixel electrode and the common electrode so that the potential of the pixel electrode is relatively high, the negatively charged white electrophoretic particles are attracted to the pixel electrode side by 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 manufacturing method of 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.

  As shown in FIGS. 4 and 5, a plurality of panel regions P are formed on the mother substrate 40. In the display area 5 of each panel area P, pixel electrodes, switching elements, and the like are formed, and in the non-display area 6, the drive circuit elements 22 and 23, the terminals 24, wirings, and the like are formed. Each one of the panel regions P becomes one electrophoretic display device 1. After forming the panel region P, the mother connection substrate 41 is attached to the back surface of the mother substrate 40 via an adhesive tape 51 or the like as shown in FIG. A perforation 41m is formed in the mother connection board 41 in advance, and a part of the mother connection board 41 is made detachable along the perforation 41m.

  After the mother connection substrate 41 is attached, the electrophoretic sheet 3 is attached to the display area 5 of each panel area P. After the electrophoretic sheet 3 is attached, the wire 24 is connected between the terminal 24 on the mother substrate 40 and the connection electrode 8 b on the mother connection substrate 41. After the connection, the cover glass 4 is disposed on the electrophoretic sheet 3 via an adhesive tape or the like. After the cover glass 4 is disposed, a sealing material 47 is filled between the cover glass 4 and the mother substrate 40. When the sealing material 47 is filled, the electrophoretic display panel assembly 50 shown in FIGS. 4 and 5 is formed. After the assembly 50 of the electrophoretic display panel is formed, the assembly 50 is placed on a dicing tape 61 (see FIG. 6) so that the mother connection substrate 41 is located below, and a dicing blade 62 (see FIG. 6). Thus, the mother board 40 and the mother connection board 41 of the assembly 50 are cut. As shown in FIGS. 4 and 5, the mother substrate 40 and the mother connection substrate 41 are cut along the broken lines in the drawings to obtain individual electrophoretic display devices 1.

FIG. 6 is a cross-sectional view illustrating a partial configuration of the mother board 40 and a configuration of the mother connection board 41 in the assembly 50. FIG. 7 is a plan view showing the configuration of the mother connection board 41.
As shown in FIGS. 6 and 7, the mother connection substrate 41 includes a wiring layer 43 including a wiring connected to the connection electrode 8 b and an insulating layer 44 covering the wiring layer 43 formed on the core member 42. In addition, the support portion 60 is formed in a region corresponding to the boundary between the panel regions P. The support portion 60 is a portion that supports the mother connection substrate 41 when cutting the assembly 50 of the electrophoretic display panel. By providing the support portion 60, it becomes difficult to form a notch portion (chipping) in the mother substrate 40 at the time of cutting. Specific examples of the support portion 60 include the wiring layer 43 and the like. Therefore, the wiring layer 43 is formed so as to straddle each panel region P, and the portion of the wiring layer 43 that straddles each panel region P is electrically grounded. Thereby, even if static electricity is generated when cutting by the dicing blade 62, it is possible to prevent the influence of the static electricity from spreading to others.

  For example, as shown in FIG. 6, the support portion 60 is formed on both surfaces of the core member 42 of the mother connection substrate 41, the surface 42 a on the mother substrate 40 side and the surface 42 b opposite to the surface on the mother substrate 40 side. Most preferably. By forming the support portion 60 on the surface 42a and the surface 42b, the mother connection substrate 41 and the dicing tape 61 and the mother connection substrate 41 and the mother substrate 40 are supported, respectively, so that chipping is performed. Can be reliably suppressed.

  Further, for example, the support 60 may be formed on only one of the surface 42a and the surface 42b of the mother connection substrate 41. Even when the support portion is formed on only one of them, the formation of chipping is suppressed. In this case, it is preferable to form the support portion 60 on the surface 42a. By directly supporting the mother substrate 40, the chipping formation of the mother substrate 40 is more reliably suppressed.

  As described above, according to the present embodiment, the region of the element substrate 2 in which the display region 5 and the drive circuit elements 22 and 23 are provided is not covered with the connection substrate 8 in plan view. Even in the state where is attached, the states of the drive circuit elements 22 and 23 and the display area 5 can be confirmed from the back surface 20b side of the element substrate 2. Thereby, since the presence or absence of the damage of the drive circuit elements 22 and 23 and the display area 5 can be confirmed before shipment, the quality of the electrophoretic display device 1 can be ensured.

  Further, according to this embodiment, in the electrophoretic display panel assembly 50, the mother connection substrate 41 covers the mother substrate 40 in which the display region 5 and the drive circuit elements 22 and 23 are provided in plan view. Therefore, even when the mother connection substrate 41 is attached, the states of the drive circuit elements 22 and 23 and the display area 5 can be confirmed from the back surface 40b side of the mother substrate 40. Accordingly, since it is possible to confirm whether or not the drive circuit elements 22 and 23 and the display area 5 are damaged before the electrophoretic display panel assembly 50 is cut, the electrophoretic display panel assembly 50 is formed. The quality of the electrophoretic display device 1 can be ensured.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, the configuration of the connection board is different from that of the first embodiment, and this point will be mainly described below. Components that are the same as those in the first embodiment and that are not particularly described in the present embodiment are denoted by the same reference numerals as those in the first embodiment.

  FIG. 8 is a cross-sectional view showing the configuration of the electrophoretic display device according to the present embodiment, and corresponds to FIG. 2 in the first embodiment. FIG. 9 is a plan view showing the configuration of the back surface side (the side opposite to the display surface) of the electrophoretic display device, and corresponds to FIG. 3 in the first embodiment.

  As shown in FIGS. 8 and 9, the electrophoretic display device 101 includes an element substrate 102, an electrophoretic sheet 103, and a cover glass 104, as in the first embodiment, and the electrophoretic sheet 103 is provided on the element substrate 102. Is attached and a cover glass 104 is arranged on the electrophoretic sheet 103. The electrophoretic display device 101 is provided with a display area 105 for displaying images such as still images and moving images. A plurality of pixels arranged in a matrix are provided in the display area 105, and display is performed for each pixel. A region 106 around the display region 105 is a non-display region where no image is displayed. The non-display area 106 is not provided with pixels, and is provided with drive circuit elements 122 and 123, a terminal 124, and the like.

  A connection substrate 108 is attached to the element substrate 102. As in the first embodiment, the connection substrate 108 has a rectangular core member 108a made of glass epoxy or the like and a connection electrode 108b formed on the core member 108a. As shown in FIGS. 8 and 9, the core member 108 a is provided so as to cover the area excluding the display area 105 in the element substrate 102. That is, in the present embodiment, the drive circuit elements 122 and 123 are covered with the connection substrate 108. The connection electrode 108b is connected to a terminal 124 provided on the element substrate 102 via a wire 110 made of a metal such as gold or aluminum.

  According to this embodiment, the connection substrate 108 is provided so as to cover the region excluding the display region 105 in the element substrate 102, and the state of the display region 105 can be observed from the element substrate 102 side.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In the present embodiment, the configuration of the connection board is different from that of the first embodiment, and this point will be mainly described below. Components that are the same as those in the first embodiment and that are not particularly described in the present embodiment are denoted by the same reference numerals as those in the first embodiment.

  FIG. 10 is a cross-sectional view showing the configuration of the electrophoretic display device 201 according to the present embodiment, and corresponds to FIG. 2 in the first embodiment. FIG. 11 is a plan view showing the configuration of the back surface side (the side opposite to the display surface) of the electrophoretic display device 201, and corresponds to FIG. 3 in the first embodiment.

  As shown in FIGS. 10 and 11, the electrophoretic display device 201 includes an element substrate 202, an electrophoretic sheet 203 and a cover glass 204, as in the first embodiment, and the electrophoretic sheet 203 is attached to the element substrate 202. The cover glass 204 is disposed on the electrophoretic sheet 203 while being bonded. The electrophoretic display device 201 is provided with a display area 205 for displaying images such as still images and moving images. A plurality of pixels arranged in a matrix are provided in the display area 205, and display is performed for each pixel. A region 206 around the display region 205 is a non-display region where no image is displayed. The non-display area 206 is not provided with pixels, and is provided with drive circuit elements 222 and 223, a terminal 224, and the like.

  A connection substrate 208 is attached to the element substrate 202. As in the first embodiment, the connection substrate 208 includes a rectangular core member 208a made of glass epoxy and the like, and a connection electrode 208b formed on the core member 208a. As shown in FIGS. 10 and 11, the core member 208 a is provided so as to cover a region of the element substrate 202 excluding the drive circuit elements 222 and 223. That is, in the present embodiment, the display area 205 is covered with the connection substrate 208. The connection electrode 208b is connected to a terminal 224 provided on the element substrate 202 via a wire 210 made of a metal such as gold or aluminum.

  According to the present embodiment, the connection substrate 208 is provided so as to cover a region of the element substrate 202 excluding the drive circuit elements 222 and 223, and the state of the drive circuit elements 222 and 223 is observed from the element substrate 202 side. can do.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In the present embodiment, the configuration of the connection board is different from that of the first embodiment, and this point will be mainly described below. Components that are the same as those in the first embodiment and that are not particularly described in the present embodiment are denoted by the same reference numerals as those in the first embodiment.

  FIG. 12 is a cross-sectional view showing the configuration of the electrophoretic display device 301 according to this embodiment, and corresponds to FIG. 2 in the first embodiment. FIG. 13 is a plan view showing the configuration of the back side (the side opposite to the display surface) of the electrophoretic display device 301, and corresponds to FIG. 3 in the first embodiment.

  As shown in FIGS. 12 and 13, the electrophoretic display device 301 includes an element substrate 302, an electrophoretic sheet 303 and a cover glass 304, as in the first embodiment, and the electrophoretic sheet 303 is provided on the element substrate 302. The cover glass 304 is disposed on the electrophoretic sheet 303 while being bonded. The electrophoretic display device 301 is provided with a display area 305 for displaying images such as still images and moving images. A plurality of pixels arranged in a matrix are provided in the display area 305, and display is performed for each pixel. A region 306 around the display region 305 is a non-display region where no image is displayed. The non-display area 306 is not provided with pixels, and is provided with drive circuit elements 322 and 323, a terminal 324, and the like.

  As in the first embodiment, the connection substrate 308 includes a rectangular core member 308a made of glass epoxy or the like, and a connection electrode 308b formed on the core member 308a. As shown in FIGS. 12 and 13, the core member 308 a is provided so as to cover almost the entire back surface 302 b of the element substrate 302. A groove 308c is provided along a region between the drive circuit element 322 and the terminal 324 in the plan view of the core member 308a. The groove portions 308c are formed with a uniform length at a constant pitch along the extending direction (vertical direction in the figure), for example, and are formed in a so-called perforated shape. As shown in FIG. 12, the groove 308 c is formed with substantially the same width from the front surface side to the back surface side of the connection substrate 308 in a cross-sectional view. A region on the right side (terminal 324 side) in the drawing with respect to the groove 308c of the core member 308a is attached to the element substrate 302 via an adhesive or the like (not shown), and a left side (display region) in the drawing with respect to the groove 308c. The region (305 side) is not attached to the element substrate 302. The connection electrode 308b is connected to a terminal 324 provided on the element substrate 302 via a wire 310 made of a metal such as gold or aluminum with respect to the groove 308c.

  Before shipment of the electrophoretic display device 301 configured as described above, a region of the connection substrate 308 that is not attached to the element substrate 302, that is, a display region in the drawing of the groove portion 308c formed in a perforation shape. The state of the display region 305 and the drive circuit elements 322 and 323 can be observed by cutting the 305 side portion and observing the electrophoretic display device 301 from the back surface 302b side of the element substrate 302.

  As described above, according to this embodiment, since at least a part of the area in which the element and the display area are provided in the plan view in the second substrate is provided so as to be removable, the connection board can be obtained by removing the part. Even in the state of pasting, the state of the element and the display region can be confirmed from the second surface side of the second substrate. Thereby, since the presence or absence of damage to the element or the display area can be confirmed before shipment, the quality of the electrophoretic display device can be ensured.

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 fourth embodiment, the groove 308c is formed along the region between the drive circuit element 322 and the terminal 324. However, the present invention is not limited to this. For example, the display region 305, the drive The groove 308c may be formed so as to surround the circuit elements 322 and 323, respectively.

  In the fourth embodiment, when the groove 308c is formed in the connection substrate 308, the cross-sectional shape of the groove 308c is formed so that the width of the groove 308c is substantially equal from the front surface side to the back surface side of the connection substrate 308. However, the present invention is not limited to this. For example, the connection substrate 308 may be formed so that the width gradually decreases from the rear surface side to the front surface side, that is, in a V shape in a sectional view. Absent.

  In addition, when the perforation is formed in the connection substrate when the connection substrate is cut out in each of the above embodiments, in addition to the configuration in which the perforation is formed in the connection substrate, for example, a configuration in which a slit is formed may be employed. I do not care. In this case, the connection substrate can be cut by forming a slit so that a part of the cut portion of the connection substrate is connected, and cutting the connected portion. Of course, the groove 308c may be formed in such a slit shape in the fourth embodiment.

  In the above embodiment, the connection board is configured to have a green appearance. However, the present invention is not limited to this. For example, the core member of the connection board itself is made of a transparent material, and the core The insulating layer (resist) formed on the member may be made of a transparent material.

1 is a plan view showing a configuration of an electrophoretic display device according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view showing the configuration of the electrophoretic display device according to the embodiment. The top view which shows the structure of the back surface of the electrophoretic display device which concerns on this embodiment. The top view which shows the structure of the aggregate | assembly of the electrophoretic display panel which concerns on this embodiment. FIG. 3 is a cross-sectional view illustrating a configuration of an assembly of the electrophoretic display panel according to the embodiment. Sectional drawing which shows the structure of a part of aggregate | assembly of an electrophoretic display panel. The top view which shows the structure of a part of aggregate | assembly of an electrophoretic display panel. Sectional drawing which shows the structure of the electrophoretic display device which concerns on 2nd Embodiment of this invention. FIG. 2 is a plan view showing the configuration of the electrophoretic display device according to the embodiment. Sectional drawing which shows the structure of the electrophoretic display device which concerns on 3rd Embodiment of this invention. FIG. 2 is a plan view showing the configuration of the electrophoretic display device according to the embodiment. Sectional drawing which shows the structure of the electrophoretic display device which concerns on 4th Embodiment of this invention. FIG. 2 is a plan view showing the configuration of the electrophoretic display device according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 101, 201, 301 ... Electrophoretic display apparatus 2 ... Element board | substrate 3 ... Electrophoresis sheet 4 ... Cover glass 5 ... Display area 6 ... Non-display area 7 ... Sealing material 8 ... Connection board 8a ... Core member 8b ... Connection Electrode 10 ... Wire 22, 23 ... Drive circuit element 24 ... Terminal 30 ... Transparent substrate 31 ... Electrophoresis layer 32 ... Microcapsule 33 ... Adhesive layer 40 ... Mother substrate 41 ... Mother connection substrate 42 ... Core member 43 ... Wiring layer 44 ... Insulating layer 50 ... Aggregate 60 ... Support portion 308c ... Groove portion

Claims (12)

An electrophoretic display device in which an electrophoretic sheet in which an electrophoretic substance layer and an adhesive layer are provided on a first substrate is bonded to a display area of a first surface of a second substrate provided with an element,
A connection substrate provided on a second surface opposite to the first surface of the second substrate and having a connection electrode electrically connected to the second substrate via a wire;
The electrophoretic display device, wherein the connection substrate is provided so as to cover a region excluding at least a part of a region overlapping the element and the display region in plan view. An electrophoretic display device in which an electrophoretic sheet in which an electrophoretic substance layer and an adhesive layer are provided on a first substrate is bonded to a display area of a first surface of a second substrate provided with an element,
A connection substrate provided on a second surface opposite to the first surface of the second substrate and having a connection electrode electrically connected to the element via a wire;
The electrophoretic display device, wherein the connection substrate is provided so that at least a part of a region overlapping the element and the display region in a plan view can be removed. The electrophoretic display device according to claim 2, wherein a groove portion is provided in the connection substrate along the detachable region. A plurality of pixels are provided in the display area of the second substrate,
A pixel electrode is provided for each of the plurality of pixels,
A switching element is provided for each of the pixel electrodes,
The electrophoretic display device according to any one of claims 1 to 3, wherein the element is a drive circuit that drives the switching element. An electrophoretic sheet having a mother substrate in which a plurality of display regions are provided and an element is formed for each display region, and an electrophoretic material layer and an adhesive layer are formed on a protective substrate is provided for each display region. An assembly of electrophoretic display panels bonded to the first surface of
A mother connection substrate provided on a second surface opposite to the first surface of the mother substrate, and having a connection electrode electrically connected to each of the electrophoretic sheets via a wire;
The assembly of electrophoretic display panels, wherein the mother connection substrate is provided so that at least a part of a region overlapping the element and the display region in a plan view can be removed. The aggregate of electrophoretic display panels according to claim 5, wherein a groove portion is provided in the mother connection substrate along the removable region. In a region between the display regions of the mother connection substrate, a support portion that supports the mother connection substrate is provided on at least one of the surface on the mother substrate side and the surface opposite to the mother substrate. The aggregate of electrophoretic display panels according to claim 5 or 6, characterized in that: The mother connection board is provided with a wiring layer connected to the connection electrode,
The aggregate of electrophoretic display panels according to claim 7, wherein the wiring layer also serves as the support portion. The assembly of the electrophoretic display panel according to claim 8, wherein a portion of the wiring layer disposed between the display regions is electrically grounded. Forming a plurality of display regions and elements on the first surface of the mother substrate;
Bonding a mother connection substrate having connection electrodes corresponding to the plurality of display areas to a second surface opposite to the first surface of the mother substrate;
An electrophoretic sheet is bonded to each display area on the first surface of the mother substrate,
The display area and the connection electrode corresponding to the display area are each connected by a wire,
Removing at least a part of the region overlapping the element and the display region in a plan view of the connection substrate;
The method for manufacturing an electrophoretic display device, comprising cutting the mother substrate and the mother connection substrate for each display region. Forming a plurality of display regions and elements on the first surface of the mother substrate;
Bonding a mother connection substrate having connection electrodes corresponding to the plurality of display areas to a second surface opposite to the first surface of the mother substrate;
An electrophoretic sheet is bonded to each display area on the first surface of the mother substrate,
The display area and the connection electrode corresponding to the display area are each connected by a wire,
Processing at least a part of the connection substrate in a region overlapping the element and the display region in plan view so as to be removable with respect to other parts,
The method for manufacturing an electrophoretic display device, comprising cutting the mother substrate and the mother connection substrate for each display region. At the boundary between the display areas of the mother connection substrate, a support portion that supports the mother connection substrate is provided on at least one of the first surface and the second surface,
The method for manufacturing an electrophoretic display device according to claim 10, wherein the mother connection substrate is cut in a state where the mother connection substrate is supported by the support portion.

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