KR20070077461A - Electrophoretic display sheet, electrophoretic display device, and electronic apparatus - Google Patents

Abstract

An electrophoretic display sheet, an electrophoretic display device, and an electronic apparatus are provided to prevent damage of a driving circuit and improve an image quality and an electrical characteristic by relieving a stress applied to a driving substrate when the electrophoretic display sheet is attached to the driving substrate. An electrophoretic display sheet(30) includes an electrophoretic display layer(33) and a transparent substrate(31) formed on the electrophoretic display layer. A transparent electrode layer(32) is formed on a bottom surface of the transparent substrate. The electrophoretic display sheet is formed on a driving substrate(40) including a semiconductor circuit layer(43). A stress relief member relieves a stress applied to the driving substrate when the electrophoretic display sheet is attached to the driving substrate.

Description

ELECTROPHORETIC DISPLAY SHEET, ELECTROPHORETIC DISPLAY DEVICE, AND ELECTRONIC APPARATUS}

1 is a partial cross-sectional view of an electrophoretic display 10 according to the first embodiment.

Fig. 2 is a view of the electrophoretic display device 10 according to the first embodiment as seen from above.

3 is a partial cross-sectional view of the electrophoretic display device 11 according to the second embodiment.

FIG. 4A is a partial cross-sectional view of the electrophoretic display device 12 according to the third embodiment, and FIG. 4B is a protective sheet 39, a flexible wiring board 62, and anisotropy before assembly. The figure which shows the state in which the electroconductive sheet 63 was integrated.

FIG. 5 is a view of the electrophoretic display device 12 according to the third embodiment from above. FIG.

FIG. 6A is a partial cross-sectional view of the electrophoretic display device 13 according to the fourth embodiment, and FIG. 6B is a protective sheet 139, a flexible wiring board 62, and anisotropic conductivity before assembly. The figure which shows the state in which the sheet 63 was integrated.

7 is a partial cross-sectional view of an electrophoretic display device 10 'according to the fifth embodiment.

8 is a partial cross-sectional view of the electrophoretic display device 11 'according to the sixth embodiment.

Fig. 9 is a view showing the end portions of the transparent substrates used in the seventh to ninth embodiments.

10A is a diagram showing an end portion of the transparent substrate 131 used in the tenth embodiment, and FIG. 10B is a partial cross-sectional view of the electrophoretic display device 20. FIG.

Explanation of symbols for the main parts of the drawings

10, 11, 12, 13, 10 ', 11', 20: electrophoretic display device

30: electrophoretic display sheet 33: electrophoretic display layer

32: transparent electrode layer

31, 135, 235, 335, 131: transparent substrate 35: extended protrusion

35 ': end 37: buffer part

39, 139, 71: protective sheet 40: drive substrate

41: protective layer 42: gate line layer

43 semiconductor circuit layer 44 back substrate

51 organic semiconductor 52 pixel electrode

53: data line 54: thin film transistor

61: external connection terminal

62: flexible wiring board

63: anisotropic conductive sheet

435: sprayed-out portion

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display sheet, an electrophoretic display device, and an electronic device using electrophoresis in which an charged particle in a medium moves by voltage application for image formation, and more particularly, electrophoresis. The present invention relates to an electrophoretic display sheet, an electrophoretic display device, and an electronic device capable of relieving stress on the driving substrate when the display sheet is bonded to the driving substrate to prevent breakage of the driving circuit.

An electrophoretic display device (so-called EPD display device) having an electrophoretic element is a display device using electrophoresis in which particles dispersed in a solvent are moved by voltage application, and are microcapsule type electrophoresis method, horizontally mobile type electrophoresis method, Vertical electrophoresis methods have been developed. EPD displays are easier to process and handle than LCDs and are expected to be used in portable devices and information devices.

An electrophoretic display device is produced by bonding an electrophoretic display sheet on which an electrophoretic element is formed on a plastic transparent substrate, and a driving substrate on which an element or an electrode for driving the electrophoretic display sheet is formed.

Due to the pressure at the time of adhesion, an end portion of the electrophoretic display sheet penetrates into the driving substrate, and the transparent electrode included in the electrophoretic display sheet is in contact with the driving electrode to short-circuit or the thin film transistor circuit portion is broken. In order to prevent such troubles, in the past, a protective sheet was formed at the end of the drive substrate to protect the drive circuit from the end of the electrophoretic display sheet.

However, the conventional method requires a step of attaching a protective sheet, and also requires a constant area on the drive substrate for attaching the protective sheet.

In addition, the protective sheet usually requires a thickness of about 50 µm to 100 µm in order to obtain strength as a sheet, but this thickness is the thickness of the display layer of the electrophoretic capsule (for example, 20 µm to 30 µm). Since it is larger, the electrophoretic display sheet around the protective sheet is lifted, and there is also a problem of lowering the electrical characteristics.

This problem becomes even more pronounced when a soft material such as a plastic substrate is used as the back substrate provided in the drive substrate in order to realize a flexible electrophoretic display. That is, since the driving circuit is formed on the plastic substrate, it is weak to stress, and when the end portion of the electrophoretic display sheet is pressed against the driving substrate at the time of bonding with the electrophoretic display sheet, the driving circuit on the plastic substrate is easily formed by stress concentration. It is destroyed.

In addition, the above problem can be avoided by designing the end portion of the transparent substrate so that the end portion of the transparent substrate is disposed outside the circuit region of the drive substrate at the end of the drive board not provided with an external connection terminal. It is displayed on this electrophoretic display sheet.

In addition, at the end of the drive board on which the external connection terminal is provided, since there is a wire communicating with the external connection terminal from the circuit region of the drive board, unnecessary patterns such as a wiring and a drive circuit are similarly placed on the electrophoretic display sheet. There is a problem that it is displayed.

Therefore, the present invention can prevent the damage of the driving circuit when the electrophoretic display sheet is bonded to the driving substrate, and to provide an electrophoretic display sheet and an electrophoretic display device having excellent display quality and electrical properties. The purpose.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining, the electrophoretic display sheet which contains at least the electrophoretic display layer laminated | stacked on the drive board | substrate with which the semiconductor circuit layer was provided, and the transparent substrate laminated | stacked on the said electrophoretic display layer and which has a transparent electrode layer. As the electrophoretic display sheet, the electrophoretic display sheet including stress relaxation means for alleviating the stress applied to the electrophoretic display layer when the electrophoretic display sheet is bonded to the driving substrate can be used to prevent damage to the driving circuit during bonding. The present inventors have found that an electrophoretic display device having excellent display quality and electrical characteristics can be obtained, and have completed the present invention.

That is, the present invention provides an electrophoretic display sheet comprising (1) an electrophoretic display layer laminated on a drive substrate provided with a semiconductor circuit layer, and a transparent substrate laminated on the electrophoretic display layer and having a transparent electrode layer, An electrophoretic display sheet comprising stress relaxation means for relieving stress applied to the drive substrate when the electrophoretic display sheet is bonded to the drive substrate, (2) the stress relaxation means having an end of the transparent substrate at an outer edge of the drive substrate; The electrophoretic display sheet according to the above (1), wherein the extension protrusion is extended to protrude further, and the extension protrusion is in contact with a part or all of the upper surface of the flexible wiring board included in the driving substrate, and (3) the stress relaxation means is transparent. The electrophoretic display sheet as described in said (1) which is a buffer part arrange | positioned opposing a drive substrate below the edge part of a board | substrate, (4) The said stress The relaxation means is a protective sheet disposed below the end of the transparent substrate, and the protective sheet is the electrophoretic display sheet according to the above (1), which is previously integrated on the flexible wiring board included in the drive substrate, (5) the transparent The substrate is flexible, and the stress relieving means is the electrophoretic display according to (1) above, which is a surface contact means in surface contact with the driving substrate when the electrophoretic display sheet below the end of the transparent substrate is bonded to the driving substrate. The sheet | seat and (6) the said surface contact means are electrophoretic display sheets of said (5) whose lower side edge part of the said transparent board | substrate is picked, and (7) the said curved surface has curvature R of 1/10 of the thickness of the said transparent substrate. The electrophoretic display sheet according to the above (6), (8) the electrophoretic display sheet according to the above (6) or (7), wherein the portion forming the curved surface is made of an elastic member, (9) the interview The chuck means is the electrophoretic display sheet according to (5) above, which is a skirted-out portion provided under the end of the transparent substrate, (10) the electrophoresis according to any one of (1) to (9). An electrophoretic display device comprising at least a driving substrate having a display sheet, a semiconductor circuit layer and a flexible wiring board, (11) the electrophoretic display sheet according to any one of (5) to (9) above, and a semiconductor circuit An electrophoretic display device comprising at least a driving substrate having a layer and a flexible wiring board, wherein the electrophoretic display device is disposed above the edge of the transparent substrate and provided with a protective sheet at a surface contacting the driving substrate. An electronic device comprising the electrophoretic display device according to (10) or (11) is provided.

Next, the Example of this invention is described. The following examples are examples for explaining the present invention, and the present invention is not limited only to these examples. The present invention can be implemented in various forms as long as it does not depart from the gist thereof.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)

A partial cross-sectional view of the electrophoretic display device 10 of the first embodiment of the present invention is shown in FIG. 1, and a view of the electrophoretic display device 10 from above is shown in FIG. 2.

As shown in FIG. 1 and FIG. 2, the electrophoretic display device 10 includes an electrophoretic display sheet 30 and a driving substrate 40. The electrophoretic display 10 is preferably manufactured by laminating a flexible electrophoretic display sheet 30 on the flexible drive substrate 40.

The electrophoretic display sheet 30 is composed of an electrophoretic display layer 33 and a transparent substrate 31 laminated thereon with a transparent electrode layer 32 formed on the lower surface thereof. The transparent substrate 31 is a transparent insulating synthetic resin, for example, a polyethylene terephthalate (PET) film. The transparent electrode layer 32 is, for example, an indium oxide film (ITO film) doped with tin.

The electrophoretic display layer 33 is provided with the electrophoretic dispersion liquid enclosed in a microcapsule made of a transparent resin. The electrophoretic dispersion is formed by encapsulating a transparent insulating liquid, plus positively charged white particles, and negatively charged black pigment. The electrophoretic particles have a property of moving in the electrophoretic dispersion medium in accordance with the applied voltage. The film thickness of the electrophoretic display layer 33 is 20 micrometers-30 micrometers, for example.

The driving substrate 40 includes a back substrate 44 as an insulating base substrate, a semiconductor circuit layer 43, a gate line layer 42, and a protective layer 41 that are sequentially stacked thereon.

Although the back substrate 44 may be glass, Preferably, it is a plastic substrate, such as polycarbonate with a film thickness of 200 micrometers, for example. On the rear substrate 44, a plurality of pixel electrodes 52, data lines 53, and organic semiconductors 51 are formed in a row direction and a column direction through a UV (ultraviolet ray) curable adhesive or the like, thereby forming a thin film transistor. A plurality of 54 are formed. The group of pixel electrodes 52 arranged in a matrix form forms a display area for displaying an image (two-dimensional information).

As the thin film transistor 54, an organic TFT, an amorphous SiTFT, a poly SiTFT, or the like is used, for example.

About the form which forms a thin film semiconductor circuit on such a board | substrate, it introduces, for example in Unexamined-Japanese-Patent No. 10-125931, Unexamined-Japanese-Patent No. 11-26733, Unexamined-Japanese-Patent No. 2004-327836, etc., for example. A thin film semiconductor circuit can be formed on a heat-resistant substrate (glass substrate), and the thin film circuit can be used to transfer the thin film semiconductor circuit to the resin substrate in whole or in part.

A flexible wiring board (FPC) 62 is connected to an end portion of the pixel electrode 52 on the rear substrate 44 via an external connection terminal 61 and an anisotropic conductive sheet 63. The flexible wiring board 62 is polyamide, for example.

An end portion of the transparent substrate 31 on which the transparent electrode layer 32 is formed has an extension protrusion 35 that protrudes more than an outer edge of the drive substrate 40, and the extension protrusion 35 has a flexible wiring board 62. It is in contact with a part of the upper surface.

In the first embodiment, the above-described configuration can prevent the end portion of the transparent substrate 31 from coming into contact with the drive substrate 40. That is, the stress applied to the driving substrate 40 when the electrophoretic display sheet 30 is bonded to the driving substrate 40 can be alleviated, so that the electrophoretic display apparatus having excellent display quality and electrical characteristics can be realized.

In addition, although the display apparatus provided with the display layer of a microcapsule type electrophoresis system was demonstrated above, this invention is not limited to this, It may be a display apparatus of a horizontal type electrophoresis system or a vertical type electrophoresis system.

In addition, although the case where the extended protrusion part 35 abuts on a part of upper surface of the flexible wiring board 62 was demonstrated, it can also be set as the structure which the extended protrusion part 35 abuts on the whole upper surface of the flexible wiring board 62. As shown in FIG.

Moreover, according to the said structure, it is not necessary to form a protective sheet above the edge part of a drive board like conventionally.

(Second embodiment)

3 is a partial cross-sectional view of the electrophoretic display device 11 of the second embodiment of the present invention.

As shown in FIG. 3, the electrophoretic display device 11 of the second embodiment differs from the first embodiment only in that the shock absorbing portion 37 is provided in place of the extension protrusion 35. As shown in FIG. In Fig. 3, parts corresponding to those in Fig. 1 are denoted by the same reference numerals, and description of those parts is omitted.

The buffer part 37 is arrange | positioned under the edge part of the transparent substrate 31 in which the transparent electrode layer 32 was formed facing the driving substrate 40. As shown in FIG.

Also in this second embodiment, the end portion of the transparent substrate 31 can be prevented from contacting the driving substrate 40. That is, the stress applied to the driving substrate 40 when the electrophoretic display sheet 30 is bonded to the driving substrate 40 can be alleviated, so that the electrophoretic display apparatus having excellent display quality and electrical characteristics can be realized.

(Third embodiment)

FIG. 4A is a partial cross-sectional view of the electrophoretic display 12 of the third embodiment of the present invention, and FIG. 4B is a protective sheet 39, a flexible wiring board 62, and anisotropy before assembly. It is a figure which shows the state in which the electroconductive sheet 63 was integrated. 5 is a view of the electrophoretic display device 12 viewed from above.

4 and 5, the electrophoretic display device 12 of the third embodiment differs from the first embodiment only in that the protective sheet 39 is provided in place of the extension protrusion 35. As shown in FIG. As shown in FIG.4 (b), the front-end | tip part of the protective sheet 39 is adhere | attached on the flexible wiring board 62 with which the drive board 40 is equipped, and is integrated previously.

By assembling the integrated component shown in FIG. 4B, as shown in FIG. 4A, the end portion of the protective sheet 39 is formed of a transparent substrate having a drive substrate 40 and a transparent electrode layer 32 formed therein ( 31) is placed between.

Also in this third embodiment, the end portion of the transparent substrate 31 can be prevented from coming into contact with the driving substrate 40. In other words, when the electrophoretic display sheet 30 is bonded to the driving substrate 40, the stress applied to the driving substrate 40 can be alleviated, thereby realizing an electrophoretic display apparatus having excellent display quality and electrical characteristics. .

(Example 4)

FIG. 6A is a partial cross-sectional view of the electrophoretic display 13 of the fourth embodiment of the present invention, and FIG. 6B is a protective sheet 139, a flexible wiring board 62, and anisotropy before assembly. It is a figure which shows the state in which the electroconductive sheet 63 was integrated.

As shown in Fig. 6, the electrophoretic display device 13 of the fourth embodiment differs from the third embodiment in that only the protective sheet 139 is provided in place of the protective sheet 39. As shown in FIG. 6B, the protective sheet 139 is made of the same resin as the resin constituting the flexible wiring board 62, and is integrally formed and molded in advance.

Also in the fourth embodiment, as shown in Fig. 6A, the end portion of the protective sheet 139 is disposed between the drive substrate 40 and the transparent substrate 31 on which the transparent electrode layer 32 is formed.

Also in the fourth embodiment, the end portion of the transparent substrate 31 can be prevented from coming into contact with the driving substrate 40. That is, the stress applied to the driving substrate 40 when the electrophoretic display sheet 30 is bonded to the driving substrate 40 can be alleviated, so that the electrophoretic display apparatus having excellent display quality and electrical characteristics can be realized.

(Example 5)

A partial cross-sectional view of the electrophoretic display device 10 'of the fifth embodiment of the present invention is shown in FIG.

As shown in FIG. 7, the electrophoretic display device 10 ′ is composed of an electrophoretic display sheet 30 and a driving substrate 40. The electrophoretic display device 10 'is preferably manufactured by laminating a flexible electrophoretic display sheet 30 on the flexible drive substrate 40.

The electrophoretic display sheet 30 is composed of an electrophoretic display layer 33 and a flexible transparent substrate 31 laminated thereon with a transparent electrode layer 32 formed on the lower surface thereof. The transparent substrate 31 is a transparent insulating synthetic resin, for example, a polyethylene terephthalate (PET) film. The transparent electrode layer 32 is, for example, an indium oxide film (ITO film) doped with tin.

The electrophoretic display layer 33 is provided with the electrophoretic dispersion liquid enclosed in a microcapsule made of a transparent resin. The electrophoretic dispersion is composed by encapsulating a transparent insulating liquid with positively charged white particles and negatively charged black pigments. The electrophoretic particles have a property of moving in the electrophoretic dispersion medium in accordance with the applied voltage. The film thickness of the electrophoretic display layer 33 is 20 micrometers-30 micrometers, for example.

The driving substrate 40 includes a back substrate 44 as an insulating base substrate, a semiconductor circuit layer 43, a gate line layer 42, and a protective layer 41 that are sequentially stacked thereon.

Although the back substrate 44 may be glass, Preferably, it is a plastic substrate, such as polycarbonate with a film thickness of 200 micrometers, for example. On the rear substrate 44, a plurality of pixel electrodes 52, data lines 53, and organic semiconductors 51 are formed in a row direction and a column direction through a UV (ultraviolet ray) curable adhesive or the like, thereby forming a thin film transistor. A plurality of 54 are formed. The group of pixel electrodes 52 arranged in a matrix form forms a display area for displaying an image (two-dimensional information).

As the thin film transistor 54, an organic TFT, an amorphous SiTFT, a poly SiTFT, or the like is used, for example.

About the form which forms a thin film semiconductor circuit on such a board | substrate, it introduces, for example in Unexamined-Japanese-Patent No. 10-125931, Unexamined-Japanese-Patent No. 11-26733, Unexamined-Japanese-Patent No. 2004-327836, etc., for example. The thin film semiconductor circuit can be formed on a heat-resistant substrate (glass substrate), and the thin film circuit can be used to transfer the thin film semiconductor circuit to the resin substrate in whole or in part.

A flexible wiring board (FPC) 62 is connected to an end portion of the pixel electrode 52 on the back substrate 44 via an external connection terminal 61 and an anisotropic conductive sheet 63. The flexible wiring board 62 is polyamide, for example.

The lower end 35 'of the transparent substrate 31 having the transparent electrode layer 32 forms a curved surface, and when the electrophoretic display sheet 30 is attached to the driving substrate 40, the curved portion is formed. Abuts against an upper end surface of the driving substrate 40. Since the transparent board | substrate 31 is flexible and the lower side of the edge part is plucked, some or all of the site | parts which make a curved surface at the contact part contact surface contact with the upper surface of the drive board 40.

It is preferable that curvature R is 1/10 or more of the thickness of the said transparent substrate, and, as for the said curved surface which the transparent substrate 31 has, it is further more preferable that it is 1/3 or more and 1 or less.

In the fifth embodiment, since the lower end portion of the transparent substrate 31 is in surface contact with the driving substrate 40, the electrophoretic display sheet 30 is driven when the electrophoretic display sheet 30 is bonded to the driving substrate 40. The stress applied to the substrate 40 can be alleviated, and an electrophoretic display device having excellent display quality and electrical characteristics which can prevent breakage or disconnection of the driving circuit can be realized.

In addition, although the display apparatus provided with the display layer of a microcapsule type electrophoresis system was demonstrated above, this invention is not limited to this, It may be a display apparatus of a horizontal type electrophoresis system or a vertical type electrophoresis system.

In addition, the part which comprises the said curved surface may be comprised with the elastic member. This can be produced, for example, by heat-sealing an elastomer below the end of the transparent substrate 31. By providing such an elastic member, breakage and disconnection of the drive circuit of the drive board 40 can be prevented more effectively.

(Example 6)

A partial cross-sectional view of the electrophoretic display device 11 'of the sixth embodiment of the present invention is shown in FIG.

As shown in FIG. 8, the electrophoretic display device 11 ′ of the sixth embodiment differs from the fifth embodiment only in that the protective sheet 71 is provided on the upper end surface of the driving substrate 40. In FIG. 8, the same code | symbol is attached | subjected to the part corresponding to FIG. 7, and description of that part is abbreviate | omitted.

By providing the protective sheet 71 in this manner, it is possible to more effectively prevent breakage or disconnection of the driving circuit of the driving substrate 40.

(7th to 9th embodiment)

9A to 9C are ends of the transparent substrates used in the seventh to ninth embodiments, respectively, and are views showing a state before assembly.

The seventh to ninth embodiments differ from the fifth embodiment only in that they are provided with transparent substrates 135, 235, and 335 instead of the transparent substrate 31 of the fifth embodiment. As shown in Fig. 9 (a) to (c), the lower side of the end portion of the transparent substrates 135, 235, and 335 forms a curved surface. Thereby, similarly to the fifth embodiment, when the electrophoretic display sheet 30 is attached to the driving substrate 40, the portion forming the curved surface is in surface contact with the upper surface of the driving substrate 40.

As described above, in the seventh to ninth embodiments, the stress applied to the driving substrate 40 can be alleviated when the electrophoretic display sheet 30 is bonded to the driving substrate 40. Breakage of the circuit can be prevented.

(Method for Manufacturing Transparent Substrate)

The transparent substrate having a curved surface with the lower side of the end used in the fifth to ninth embodiments can be rounded by (i) cutting the transparent substrate with a carbon dioxide laser, and (ii) The end is heated to melt, pressed into the mold to round, (iii) the end of the transparent substrate is heated to melt, rounded using surface tension, and (iv) the end of the transparent substrate is mechanically cut. (v) after dropping or applying an ultraviolet curable resin or a thermosetting resin (for example, a two-liquid mixed epoxy) to the edges of the transparent substrate, the surface is rounded using a tension and further ultraviolet or heat is applied. It can manufacture by the method of adding and hardening | curing.

(Example 10)

FIG. 10A is an end of the transparent substrate 131 used in the tenth embodiment of the present invention and shows a state before assembly, and FIG. 10B is a part of the electrophoretic display device 20. It is a cross section.

The electrophoretic display device 20 of the tenth embodiment differs from the fifth embodiment in that the transparent substrate 131 is provided instead of the transparent substrate 31 of the fifth embodiment.

As shown in FIG. 10A, the lower end portion of the transparent substrate 131 having the transparent electrode layer 32 includes a skirt portion 435. When attaching the electrophoretic display sheet 30 to the driving substrate 40, the pressure indicated by the arrow A is applied to the end of the transparent substrate 31 by the processing member 5. This pressure is distributed as arrow B through the skirt portion 435.

As shown in FIG. 10B, when the electrophoretic display sheet 30 is attached to the driving substrate 40, the skirt portion 435 abuts on the upper surface of the driving substrate 40. Since the transparent substrate 131 is flexible, some or all of the skirt portion is in surface contact with the upper end surface of the driving substrate 40 at the abutting portion.

Also in this tenth embodiment, since the lower end of the transparent substrate 131 is in surface contact with the driving substrate 40, the stress applied to the driving substrate 40 when the electrophoretic display sheet 30 is bonded to the driving substrate 40. Can be alleviated to prevent damage to the driving circuit.

(Electronics)

The electronic device of the present invention includes the above-mentioned electrophoretic display device. Here, "electronic device" includes all devices having a display unit using a display by electrophoretic material, and includes a display device, a television device, an electronic book, an electronic paper, a watch, an electronic notebook, an electronic calculator, a mobile phone, And a portable information terminal. In addition, the thing which deviates from the concept of "apparatus", for example, belongs to a real estate such as a flexible paper-like / film-like object, a wall surface to which these objects are attached, and also belongs to a moving object such as a vehicle, a flying vehicle, a ship, etc. Include.

According to the present invention, the stress applied to the driving substrate when the electrophoretic display sheet is bonded to the driving substrate can be alleviated to prevent breakage of the driving circuit, and to provide an electrophoretic display apparatus having excellent display quality and electrical characteristics. Can be.

Claims (12)

An electrophoretic display layer laminated on a drive substrate provided with a semiconductor circuit layer, An electrophoretic display sheet stacked on the electrophoretic display layer, the electrophoretic display sheet comprising at least a transparent substrate having a transparent electrode layer, An electrophoretic display sheet comprising stress relaxation means for relieving stress applied to the drive substrate when the electrophoretic display sheet is bonded to the drive substrate. The method of claim 1, The stress relieving means is an extended protrusion in which an end portion of the transparent substrate extends beyond the outer edge of the drive substrate, and the extended protrusion contacts a part or all of the upper surface of the flexible wiring board included in the drive substrate. Electrophoretic display sheet. The method of claim 1, And said stress mitigating means is a buffer portion disposed below the end of said transparent substrate so as to face said drive substrate. The method of claim 1, The stress relieving means is a protective sheet disposed below an end portion of the transparent substrate, and the protective sheet is previously integrated on a flexible wiring board included in the driving substrate. The method of claim 1, The transparent substrate is flexible, And said stress mitigating means is surface contact means which is in surface contact with the driving substrate when the electrophoretic display sheet below the end of the transparent substrate is bonded to the driving substrate. The method of claim 5, The surface contact means is a electrophoretic display sheet of which the lower side of the end of the transparent substrate is a surface picked. The method of claim 6, The curved surface is an electrophoretic display sheet having a curvature R of 1/10 or more of the thickness of the transparent substrate. The method according to claim 6 or 7, An electrophoretic display sheet consisting of the elastic portion is a portion forming the curved surface. The method of claim 5, And the surface contact means is a skirted-out portion provided under the end of the transparent substrate. The electrophoretic display sheet according to claim 1, An electrophoretic display device comprising at least a driving substrate having a semiconductor circuit layer and a flexible wiring board. An electrophoretic display sheet according to claim 5, An electrophoretic display device comprising at least a driving substrate having a semiconductor circuit layer and a flexible wiring board, An electrophoretic display device, wherein a protective sheet is provided on an area above the end of the transparent substrate and in surface contact with the driving substrate. An electronic device comprising the electrophoretic display device according to claim 10.

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