Electronic device

Abstract

To provide an electronic device having a novel form, specifically an arm-worn electronic device used while being worn on an arm, and an arm-worn secondary battery used while being worn on an arm.SOLUTION: An electronic device includes: a structure body having a curved surface used as a support structure body; a film as an exterior body over the curved surface of the support structure body; a flexible secondary battery; and a display portion including a plurality of display elements sandwiched between a pair of films over the secondary battery, where the plurality of display elements and the secondary battery overlap with each other at least partly. It is possible to provide the electronic device which is thin with a maximum thickness portion of 1 cm or less and a light weight of 50 g or less even when an arm-worn secondary battery is provided with the display portion.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] Regarding electronic devices.

[0002] In this specification, the term "electronic device" refers to any device having a secondary battery. Electro-optical devices having a secondary battery, and information terminal devices having a secondary battery are all electronic devices. [Background technology]

[0003] In recent years, display devices that are worn on the human body, such as head-mounted displays, have been proposed. These are called head-mounted displays or wearable displays. In addition, electronic devices worn on the human body, such as hearing aids, need to be made lighter and smaller. is.

[0004] In addition, as electronic devices become lighter, the batteries that supply power to these devices also need to become lighter and There is a demand for miniaturization.

[0005] In addition, electronic books equipped with a flexible display device are disclosed in Patent Documents 1 and 2. is. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2010-282181 [Patent Document 2] Patent Publication No. 2010-282183 Summary of the Invention [Problem to be solved by the invention]

[0007] In order to make the display device worn on the human body more comfortable for the user, it is necessary to make it lightweight and There is also a demand for smaller devices, and a reduction in the weight of the entire electronic device, including the display device drive unit and power supply. is required.

[0008] To provide an electronic device having a new form, specifically, a wrist-worn electronic device that is worn on the wrist. We also propose a wrist-worn secondary battery that can be worn on the arm. [Means for solving the problem]

[0009] A structure having a curved surface that comes into contact with a part of the human body is used as a support structure, and a flexible The secondary battery is attached to the arm along a curved surface. To make secondary batteries thinner so that they have flexibility, specifically to improve their volumetric energy density It is preferable to use a secondary battery having a small number of electrode layers. When stacking electrode pairs each having a positive electrode and a negative electrode in multiple layers, the number of layers is small, or the battery is a wound type. This means that the number of times the battery needs to be wound is small. Also, the maximum thickness of the wrist-worn secondary battery is 1 cm or less. It is preferable to make it as thin as possible.

[0010] The example shows a band-shaped secondary battery worn on the arm, and the secondary battery provided on the support structure. The cross-sectional shape of the battery is arched, and the ends of the support structure bend when the battery is installed. The ends of the secondary battery also bend. The ends of the secondary battery also bend, but because the secondary battery is flexible, The exterior body of the secondary battery is not destroyed, and the battery performance can be maintained.

[0011] The configuration disclosed in the present specification includes a structure having a curved surface and a curved surface of at least a part of the structure. The secondary battery has a flexible exterior film, and the structure is in contact with the curved surface of the structure. It is an electronic device that is worn on the user's arm and can be connected to a smartphone.

[0012] The flexible secondary battery has a film exterior and is attached to the curved surface of the structure. The area surrounded by the exterior body contains the positive electrode, the negative electrode, and a small amount of electrolyte. In particular, as a secondary battery, it is lightweight and has a high energy density. It is preferable to use a lithium ion secondary battery, which can be made smaller and more reliable.

[0013] The above-mentioned configuration includes a structure provided in contact with the arm, and a flexible secondary battery provided on the structure. As an example, but not limited to, a configuration in which a flexible secondary battery is provided between the structure and the arm. In this case, the configuration may include a structure having a curved surface and at least a part of the structure. The secondary battery is in contact with a curved surface, the exterior body is a film, and the secondary battery has flexibility. It is an electronic device that is worn on the user's arm and is in contact with the

[0014] In addition to the above configuration, a display unit may be further provided. In that case, the configuration has a curved surface. A structure, a secondary battery having a flexible exterior film on a curved surface of the structure, and a secondary A display unit including a plurality of display elements sandwiched between a pair of films on a battery, and a secondary battery including the plurality of display elements The battery is an electronic device that overlaps at least in part.

[0015] The larger the area where multiple display elements and secondary batteries overlap, the more heat generated by the display elements can be used to charge the secondary battery. Lithium-ion secondary batteries have difficulty operating at low temperatures, especially in cold regions. It is important to keep it warm because it can cause eye strain. Also, since it is worn on the arm, it is sandwiched between the arm and the display element. This allows the secondary battery to be efficiently heated from both the front and back sides. A highly thermally conductive material may be used as the material for the structure to effectively heat the secondary battery.

[0016] The secondary battery may be configured to come into contact with the arm, and the configuration may include a structure having a curved surface, The structure is in contact with at least a part of the curved surface, and the exterior body is a film having flexibility. The electronic device has a secondary battery and is attached to the user's arm in contact with the film. The secondary battery is heated by contact with the

[0017] In each of the above configurations, one of the pair of films sandwiching the display unit including a plurality of display elements, i.e., the structure The film closest to the body may be a metal film such as a stainless steel film.

[0018] In each of the above configurations, the display section is an active type display device having a plurality of display elements arranged in a matrix. It is preferable to use a matrix type display device. However, organic light-emitting devices are particularly thin, with a thickness of 3 mm or less. This is preferable because it is lightweight.

[0019] By using both the display unit of the wrist-worn electronic device and the display unit of a conventional mobile information terminal, The display unit of the wearable electronic device can also function as a sub-display.

[0020] In addition to the display device, each of the above configurations may include other semiconductor circuits, such as a circuit for preventing overcharging. It also includes a control circuit for the For example, an image sensor may be mounted in addition to the display device. The projected image can be displayed on a display device. In addition, a gyro sensor and an acceleration sensor can be used. By equipping the wrist-worn electronic device with sensors such as a handheld, it can turn on and off depending on the orientation and movement of the device. It is possible to save power by switching off the device. Also, it is possible to install a touch panel. By touching the desired position on the touch panel, electronic devices can be operated and information can be input. In addition, in the above configuration, a memory and a CPU can be mounted in addition to the display device. It is also possible to realize a wearable computer by combining these two.

[0021] In addition, an antenna may be further provided, and the configuration thereof includes a structure having a curved surface and A secondary battery that is in contact with at least a part of a curved surface and has a flexible exterior film and an antenna electrically connected to the secondary battery, which is attached to the user's arm in contact with the curved surface of the structure. It is a wearable electronic device.

[0022] By using an antenna, it is possible to charge a secondary battery without contact. The primary coil is magnetically coupled to the antenna (secondary coil) of the electronic device, and the The secondary coil is connected to the AC magnetic field by electromagnetic induction, which generates a voltage in the secondary coil. The antenna is placed in contact with the curved surface of the structure, and power is transmitted to the side of the structure. Therefore, it is preferable to provide the antenna of the electronic device on a flexible film. is preferred.

[0023] When installing an antenna on a wrist-worn secondary battery, charging of the secondary battery is limited to non-contact charging. In addition, it is possible to provide a memory and send and receive electronic data, or to provide a GPS function to locate the device. An antenna is installed that can obtain information and GPS time and display the location and clock. This is also fine.

[0024] Also, an antenna and a transmitting / receiving circuit that can be used as an active tag are provided, The wearable secondary battery may function as an active tag. It is a type of RFID tag and refers to an IC tag that has a built-in battery and is capable of communication.

[0025] It also functions as a spare secondary battery to supply power to mobile information terminals. In the case of mobile information terminals such as smartphones, you can wait for incoming e-mails or phone calls without turning off the power. Because it is carried around, the battery capacity decreases over time until it becomes unusable. In addition, mobile information terminals can be equipped with a variety of functions, such as cameras and sensors. The more the battery is used, the more difficult it becomes to reduce its weight, and the less space is available for the secondary battery. Even if the performance of the secondary batteries built into mobile information terminals improves, they should not be used repeatedly. Therefore, deterioration of secondary batteries is inevitable, and high-performance secondary batteries are very expensive.

[0026] Of course, you can purchase a spare secondary battery that is the same as the one built into your mobile information terminal. You may carry it with you at all times, but for security reasons, some mobile information terminals may be In many cases, portable information terminals are designed to be non-replaceable. Charging modules for portable information terminals are also available, but their dimensions are too large for portable terminals. The size of the device is the same as or larger than a personal digital assistant, and the weight exceeds that of a mobile digital assistant. In addition, spare secondary batteries must always be kept in the user's pocket or bag. In situations where there are no pockets or you cannot carry a bag, It is difficult to do so.

[0027] If you have a wrist-worn secondary battery, you can use it even if the secondary battery of the mobile information terminal runs out. It can also be used as an auxiliary power source when worn on the wrist. It is convenient because it does not need to be carried in the user's pocket or bag. When the battery is installed, the design is good, and when the image is displayed on the display, the image is displayed The display and the secondary battery are overlapped, so the secondary battery is hidden, i.e., camouflage. In addition, people do not realize that the electronic device they are wearing on their wrist is a spare secondary battery. It does not feel out of place as an accessory of clothing. In particular, women should refrain from wearing clothes without pockets. This is effective because many people also care about the appearance when wearing them.

[0028] If a wrist-worn secondary battery is provided with a display unit and a full-color display is made, the wrist-worn secondary battery will: It can be called a wrist-mounted photo frame. The user can upload his / her favorite images (photo images) etc.) can be displayed on the wrist-worn secondary battery.

[0029] In addition, although it depends on the capacity of the secondary battery, wrist-worn secondary batteries are light and have a small overall weight. The weight of the container is less than 150 g, preferably 100 g or less, and more preferably 50 g or less. When used as an auxiliary power source, the power supply does not need to be constantly on. By keeping the power supply in an off state, the reduction in battery capacity can be suppressed.

[0030] Also, if the main purpose is to use it as a spare secondary battery, there is no need for a full-color display, The display shall be monochrome or monochromatic, and the display shall only show the remaining battery level. This is also fine.

[0031] In the above configuration, the support structure may be made of metal or resin. The main part of the support structure may be made of metal and partly made of resin, or the main part of the support structure may be made of resin. Metals may be used in part of the material, such as stainless steel, aluminum, and titanium alloys. The resin may be an acrylic resin, a polyimide resin, or the like. In addition, natural materials can be used as the material for the support structure. Materials that can be used include processed wood, stone, bone, leather, paper, and cloth. Effect of the Invention

[0032] Even if a display unit is installed on the wrist-worn secondary battery, the thickest part is less than 1 cm, and it weighs only 50 g. It is possible to provide an electronic device that is lightweight and can be worn on the arm, without using both hands. It is possible to provide an electronic device that is ideal for carrying around without blocking the space. Images can be displayed on the display of the secondary battery, and the device can also be used as clothing accessories. [Brief description of the drawings]

[0033] [Figure 1] 1A and 1B are cross-sectional and perspective views illustrating one embodiment of the present invention. [Diagram 2] 1A and 1B are a top view and a cross-sectional view illustrating one embodiment of the present invention. [Diagram 3] FIG. 1 is a perspective view illustrating one embodiment of the present invention. [Figure 4] FIG. 1 is a cross-sectional view showing one embodiment of the present invention. [Diagram 5] FIG. 1 is a photograph showing one embodiment of the present invention. [Figure 6] FIG. 1 is a cross-sectional view showing one embodiment of the present invention. [Figure 7] 1A to 1C are a cross-sectional view, a bottom view, and a side view illustrating one embodiment of the present invention. [Figure 8] FIG. 13 is a diagram illustrating a center of curvature. [Figure 9] FIG. 13 is a diagram illustrating the radius of curvature of a surface. [Figure 10] 1A and 1B are a perspective view and a cross-sectional view illustrating one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following description, and various modifications in form and details are possible by those skilled in the art. The present invention is not limited to the description of the following embodiments. It is not something that can be done.

[0035] (Embodiment 1) In this embodiment, an example of an electronic device in which a display unit is provided on a wrist-worn secondary battery is shown. FIG. 1(A) shows a cross-sectional view of the device, and FIG. 1(B) shows a perspective view of the electronic device.

[0036] As shown in FIG. 1A, the electronic device 100 has a flexible support structure 101 on a curved surface. It has a secondary battery 103 and a display unit 102 on the secondary battery 103 .

[0037] The shape of the support structure 101 is a bracelet made by bending a belt-like structure. At least a part of 01 is flexible, and can be moved in the direction of arrow 105. The support structure 101 shown in FIG. 1(A) has a flexible end. The support structure is stable and has little variation in the center, which is far from the ends. The curvature at the center of 101 remains the same as when it was attached and fixed at the time of production, and it is easy to wear it on the arm. Even if the garment is repeatedly worn, the secondary battery 103 and the display unit 102 overlapping the center portion are hardly damaged.

[0038] In addition, when an active matrix display device is provided in the display section, The device has at least a layer including a transistor. The layer including the transistor is supported by a support structure. If the device is simply attached to the curved surface of the body 101 and fixed thereto, the reliability is unlikely to decrease. The layer containing the metal is bent in one direction to form a concave surface, then returned to a flat surface, and then If the surface is repeatedly bent in the other direction to make it convex, reliability may decrease. In that sense, the support structure 101 shown in FIG. Therefore, by fixing it to the curved surface of the support structure 101, even if it does bend, it will only be in one direction. In other words, the support structure 101 can be configured to only warp. It acts as a protective material to prevent the pond 103 from warping too much or from undergoing large torsional deformation. It works like this.

[0039] The material of the support structure 101 can be metal, resin, natural material, etc. For this reason, it is preferable that the thickness of the support structure 101 is thin. It is preferable that the support structure 101 is made of resin because of its excellent impact resistance and high thermal conductivity. Its use can reduce weight and does not cause metal allergies.

[0040] The shape of the electronic device shown in FIG. 1B is an example, and may be a belt or a clasp for fixing it to the wrist. A clasp may be provided. Alternatively, the device may be a ring-shaped or cylindrical electronic device that surrounds the wrist. stomach.

[0041] In addition, the device is shown to be worn on the wrist (forearm including the wrist) or upper arm, etc. The device is not particularly limited as long as it is a part of the human body, and may be attached to, for example, the waist or ankle. In this case, the shape should be different from that shown in Figure 1 and the size should be made to fit the shape of the ankle. If you want to wear it around your waist, you can make it so that it can be worn around your waist like a belt. .

[0042] An example of a method for manufacturing the electronic device 100 will be described below.

[0043] First, a support structure 101 is prepared. The support structure 101 has a cross section with a radius of curvature of The stainless steel material is used, which has a large area that hardly deforms and has a bendable end. By using a glass material, the display unit 102 and the secondary battery 103 do not warp too much or are not easily damaged. It acts as a protective material to prevent torsional deformation. Also, the deformation when worn on the arm is constant, i.e. The bending in one direction also leads to improved reliability.

[0044] Next, a secondary battery 103 to be attached to the area of ​​the support structure 101 with a large radius of curvature is prepared. do.

[0045] The secondary battery 103 is a lithium ion secondary battery, and is particularly suitable if it has flexibility. The flexible secondary battery is not limited to the above. The exterior body of the flexible secondary battery is a thin and flexible film. This allows deformation to follow the curved surface portion of the support structure 101 in an area with a large radius of curvature. Cut.

[0046] In this embodiment, an example of using a laminated secondary battery as a secondary battery having flexibility is described. FIG. 2(A) shows the top surface of a laminated secondary battery. A schematic diagram of the cross section cut at -B is shown in Figure 2(B).

[0047] A sheet-shaped positive electrode 203, a separator 207, and a sheet-shaped negative electrode 206 are laminated together. The other areas are filled with electrolyte 210 and are enclosed in an exterior body made of one or two films. The positive electrode 203 is a secondary battery that is made of a positive electrode current collector 201 and a positive electrode active material layer 2 02. The negative electrode 206 has a negative electrode current collector 204 and a negative electrode active material layer 205. .

[0048] The materials for the positive electrode current collector 201 and the negative electrode current collector 204 include stainless steel, gold, platinum, zinc, etc. Metals such as iron, nickel, copper, aluminum, titanium, tantalum, and alloys thereof It is possible to use a material that is highly conductive and does not alloy with carrier ions such as lithium. In addition, the heat resistance of silicon, titanium, neodymium, scandium, molybdenum, etc. has been improved. Aluminum alloys containing elements that react with silicon can be used. Alternatively, the insulating layer may be made of a metal element that reacts with silicon to form a silicide. The metallic elements that make up the alloy include zirconium, titanium, hafnium, vanadium, niobium, and tantalum. There are various materials such as niobium, chromium, molybdenum, tungsten, cobalt, and nickel. The negative electrode current collector 201 and the negative electrode current collector 204 may be in the form of a foil, a plate (sheet), a mesh, a cylinder, a coil, The positive electrode collector may be in the form of a punched metal, an expanded metal, or the like. The current collector 201 and the negative electrode current collector 204 have a thickness of 10 μm or more and 30 μm or less. It is good.

[0049] The positive electrode active material layer 202 is made of a material capable of inserting and extracting lithium ions. For example, olivine type crystal structure, layered rock salt type crystal structure, or spinel type crystal structure can be formed. Lithium-containing materials with a crystalline structure are available as positive electrode active materials, such as LiFeO2, L Compounds such as iCoO2, LiNiO2, LiMn2O4, V2O5, Cr2O5, and MnO2 can be used.

[0050] As representative examples of lithium-containing materials having an olivine-type crystal structure (general formula LiMPO4 (M is one or more of Fe(II), Mn(II), Co(II), Ni(II))), there are Li FePO4, LiNiPO4, LiCoPO4, LiMnPO4, LiFe a Ni b PO 4, LiFe a Co b PO4, LiFe a Mn b PO4, LiNi a Co b PO4, Li Ni a Mn b PO4 (a + b is 1 or less, 0 < a < 1, 0 < b < 1), LiFe c Ni d C o e PO4, LiFe c Ni d Mn e PO4, LiNi c Co d Mn e PO4 (c + d + e is 1 or less, 0 < c < 1, 0 < d < 1, 0 < e < 1), LiFe f Ni g Co h Mn i P O4 (f + g + h + i is 1 or less, 0 < f < 1, 0 < g < 1, 0 < h < 1, 0 < i < 1), etc.

[0051] In particular, LiFePO4 is preferable because it well balances the requirements for a positive electrode active material, such as safety, stability, high capacity density, high potential, and the presence of lithium ions that can be extracted during initial oxidation (charging).

[0052] ​​​​Examples of lithium-containing materials having a layered rock salt type crystal structure include lithium cobalt oxide. (LiCoO2), LiNiO2, LiMnO2, Li2MnO3, LiNi 0.8 Co 0.2 O2, etc. NiCo system (general formula: LiNi x Co 1-x O2(0 <x<1))、L iNi 0.5 Mn 0.5 O2, etc. NiMn system (general formula: LiNi x Mn 1-x O2(0 <x<1))、LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 NiMnCo system (NMC and The general formula is LiNi x Mn y Co 1-x-y O2(x>0, y>0, x+y<1 In addition, Li(Ni 0.8 Co 0.15 Al 0.05 )O2, Li2MnO 3-LiMO2 (M = Co, Ni, Mn), etc.

[0053] Examples of lithium-containing materials having a spinel-type crystal structure include LiMn2O4, L i 1+x Mn 2-x O4, Li(MnAl)2O4, LiMn 1.5 Ni 0.5 O4 and others be.

[0054] A lithium-containing material having a spinel-type crystal structure containing manganese, such as LiMn2O4, A small amount of lithium nickel oxide (LiNiO2 or LiNi 1-x MO2 (M=Co, Al, etc.) ) is preferably mixed because it has the advantage of suppressing the elution of manganese and the decomposition of the electrolyte. I wish.

[0055] In addition, the positive electrode active material is a compound having the general formula Li (2-j) MSiO4 (M is Fe(II), Mn (II), Co(II), Ni(II), or other lithium-containing material (where 0≦j≦2) It can be used. The general formula is Li (2-j) A typical example of MSiO4 is Li (2-j ) FeSiO4, Li (2-j) NiSiO4, Li (2-j) CoSiO4, Li (2 -j) MnSiO4, Li (2-j) Fe k Ni l SiO4, Li (2-j) Fe k Co l SiO4, Li (2-j) Fe k Mn l SiO4, Li (2-j) Ni k Co l SiO 4. Li (2-j) Ni k Mn l SiO4 (k+l is 1 or less, 0 <k<1、0<l<1) , Li (2-j) Fe m Ni n Co q SiO4, Li (2-j) Fe m Ni n Mn q S O4, Li (2-j) Ni m Co n Mn q SiO4 (m+n+q is 1 or less, 0 <m<1、 0 <n<1、0<q<1)、Li (2-j) Fe r Ni s Co t Mn u SiO4(r+s +t + u is 1 or less, 0 < r < 1, 0 < s < 1, 0 < t < 1, 0 < u < 1), etc. of lithiation compounds can be used as materials.

[0056] Also, as the positive electrode active material, A x M2(XO4)3 (A = Li, Na, Mg, M = Fe, M n, Ti, V, Nb, Al, X = S, P, Mo, W, As, Si) represented by the general formula of the sodium silicon type compound can be used. Examples of the NASICON type compound include Fe2(MnO4) 3, Fe2(SO4)3, Li3Fe2(PO4)3, etc. Also, as the positive electrode active material , compounds represented by the general formula of Li2MPO4F, Li2MP2O7, Li5MO4 (M = Fe, Mn), perovskite type fluorides such as NaF3, FeF3, metal chalcogenides (sulfides, selenides, tellurides) such as TiS2, MoS2 , lithium-containing materials having an inverse spinel type crystal structure such as LiMVO4, vanadium oxide-based (V2O5, V6O1 3, LiV3O8, etc.), manganese oxide-based, organic sulfur-based and other materials can be used.

[0057] Also, in the positive electrode active material layer 202, in addition to the above-described positive electrode active material, for enhancing the adhesion of the active material a binder, a conductive aid for enhancing the conductivity of the positive electrode active material layer 202, etc. may be included.

[0058] As the negative electrode active material layer 205, materials capable of lithium dissolution / precipitation or lithium ion insertion / desorption can be used, and lithium metal, carbon-based materials, alloy-based materials, etc. can be used.

[0059] Lithium metal has a low redox potential (-3.045 V with respect to the standard hydrogen electrode), weight and and high specific capacity per volume (3860mAh / g and 2062mAh / cm, respectively). 3 ) is therefore preferable.

[0060] Carbon-based materials include graphite, graphitizable carbon (soft carbon), and non-graphitizable carbon (hard carbon). Examples of nanofibers include graphene, carbon nanotubes, graphene, and carbon black.

[0061] Graphite includes mesocarbon microbeads (MCMB), coke-based artificial graphite, and pitch. These include artificial graphite such as spheroidized artificial graphite, and natural graphite such as spheroidized natural graphite.

[0062] When lithium ions are inserted into graphite (when lithium-graphite intercalation compounds are formed), It has a low potential similar to that of lithium metal (0.1 to 0.3 V vs. Li / Li + ).child This allows lithium-ion secondary batteries to exhibit high operating voltages. , relatively high capacity per unit volume, small volume expansion, inexpensive, and comparable to lithium metal This is preferable since it has advantages such as higher safety compared to the conventional method.

[0063] As a negative electrode active material, it is possible to carry out charge / discharge reactions by alloying / de-alloying reactions with lithium. When the carrier ion is a lithium ion, the alloy can be used. Examples of gold-based materials include Mg, Ca, Al, Si, Ge, Sn, Pb, Sb, Bi, and A. The material contains at least one of the following: Zn, Au, Zn, Cd, In, Ga, etc. The capacity of these elements is larger than that of carbon, and silicon in particular has a theoretical capacity of 4200mAh / g. For this reason, it is preferable to use silicon as the negative electrode active material. Examples of alloy materials using this include SiO, Mg2Si, Mg2Ge, SnO, and Sn O2, Mg2Sn, SnS2, V2Sn3, FeSn2, CoSn2, Ni3Sn2, C u6Sn5, Ag3Sn, Ag3Sb, Ni2MnSb, CeSb3, LaSn3, La 3Co2Sn7, CoSb3, InSb, SbSn, etc. SiO is silicon It refers to silicon oxide powder containing a rich portion, SiO y Also written as (2>y>0) For example, SiO can be any one of SiO, Si2O3, Si3O4, and SiO. This also includes materials containing one or more of these, as well as mixtures of Si powder and silicon dioxide SiO2. O is other elements (carbon, nitrogen, iron, aluminum, copper, titanium, calcium, manganese, etc. ) may also be included. That is, single crystal Si, amorphous Si, polycrystalline Si, SiO3, It refers to a material containing multiple materials selected from Si3O4, Si2O, and SiO2, and SiO is a It is a color material. SiO x (X is 2 or more) if it is colorless, transparent, or white However, secondary batteries using SiO as the material for secondary batteries can be distinguished. After fabrication, if SiO is oxidized due to repeated charging and discharging, it will change to SiO2. There may be cases where they ask questions.

[0064] In addition, titanium dioxide (TiO2) and lithium titanium oxide (Li4T i5O 12 ), lithium-graphite intercalation compound, (Li x C6), niobium pentoxide (Nb2O5 ), tungsten oxide (WO2), molybdenum oxide (MoO2), etc. can be done.

[0065] In addition, the negative electrode active material is a composite nitride of lithium and transition metals, which has a Li3N structure. Li 3-x M x N (M=Co, Ni, Cu) can be used. For example, Li 2.6 Co 0.4 N3 has a large charge / discharge capacity (900mAh / g, 1890mAh / cm 3 ) And preferable.

[0066] When a composite nitride of lithium and transition metals is used, the negative electrode active material contains lithium ions, The positive electrode active material is made of V2O5, Cr3O8, etc., which do not contain lithium ions. It is preferable that the positive electrode active material contains lithium ions. The lithium ions contained in the positive electrode active material are first removed to form the negative electrode active material. As the lithium-transition metal nitride, a complex nitride of lithium and a transition metal can be used.

[0067] In addition, a material that undergoes a conversion reaction can also be used as the negative electrode active material. For example, Lithium oxide (LiO), cobalt oxide (CoO), nickel oxide (NiO), iron oxide (FeO), etc. A transition metal oxide that does not undergo an alloying reaction with the negative electrode active material may be used. Further materials in which the reaction occurs include Fe2O3, CuO, Cu2O, RuO2, and Cr2O. 3rd order oxide, CoS 0.89 , NiS, CuS and other sulfides, Zn3N2, Cu3N, G Nitrides such as e3N4, phosphides such as NiP2, FeP2, CoP3, FeF3, BiF3 This also occurs with fluorides such as those mentioned above. Since the electric potential of the above fluorides is high, they are not used as positive electrode active materials. This is also fine.

[0068] In addition to the above-mentioned negative electrode active material, the negative electrode active material layer 205 contains a material for improving the adhesion of the active material. and a conductive assistant for increasing the conductivity of the negative electrode active material layer 205. Good too.

[0069] The electrolyte solution 210 contains lithium ions, which are carrier ions, as the solute of the electrolyte. Representative examples of electrolytes are LiPF6, LiClO4, and Li(FSO 2)2N, LiAsF6, LiBF4, LiCF3SO3, Li(CF3SO2)2N, Li(C2F5SO2)2N, etc. These electrolytes can be used alone. Two or more of them may be used in any combination and ratio. In order to make it more stable, a small amount (1wt%) of vinylene carbonate (VC) is added to the electrolyte. This may result in less decomposition of the electrolyte.

[0070] In addition, a material capable of transporting carrier ions is used as a solvent for the electrolyte 210. The solvent for the liquid is preferably an aprotic organic solvent. Representative examples of the aprotic organic solvent are: Examples include ethylene carbonate (EC), propylene carbonate, and dimethyl carbonate. diethyl carbonate (DEC), γ-butyrolactone, acetonitrile, dimethoxane ethane, tetrahydrofuran, etc., one or more of which can be used. In addition, by using a polymer material that gels as a solvent for the electrolyte, the electrolyte leakage problem is reduced. This improves safety. In addition, it is possible to make the secondary battery thinner and lighter. Representative examples of materials are silicone gel, acrylic gel, acrylonitrile gel, and polyethylene gel. Examples include ethylene oxide, polypropylene oxide, and fluorine-based polymers. As a liquid solvent, one or more flame-retardant and non-volatile ionic liquids (room-temperature molten salts) are used. By using this, the secondary battery can be protected from internal short circuits and internal temperature rises due to overcharging. This can prevent the pond from bursting or catching fire.

[0071] The separator 207 is made of cellulose (paper) or polypropylene with holes. For example, an insulator such as polyethylene can be used.

[0072] FIG. 2B shows an example in which the number of electrode layers is two (two layers: a positive electrode 203 and a negative electrode 206). However, when reducing the area (size) of a secondary battery while maintaining its capacity, By increasing the number of electrode layers to more than two, the size of the secondary battery can be reduced. If the number of layers exceeds 40, the thickness of the secondary battery increases and there is a risk of losing flexibility. The number is 40 or less, preferably 20 or less. In addition, the positive electrode active material layer 20 is formed on both sides of the positive electrode current collector. In the case of performing double-sided coating in which the negative electrode active material layer 205 is applied to both sides of the negative electrode current collector 204, When applying double-sided coating, the number of electrode layers can be reduced to 10 or less while maintaining the capacity of the secondary battery. It can also be reduced.

[0073] The sheet-shaped positive electrode 203, the separator 207, and the sheet-shaped negative electrode 206 are laminated by heating. The container is sealed by performing a seal.

[0074] Secondary batteries are made of a thin, flexible film (such as a laminate film) as an exterior body. A laminate film is a laminated film made of a base film and an adhesive synthetic resin film. It refers to a laminated film of two or more types. The base film is PET or PBT. Polyesters such as nylon 6 and nylon 66, polyamides such as nylon 6 and nylon 66, inorganic deposition films, Alternatively, paper may be used. As the adhesive synthetic resin film, a polyester film such as PE or PP may be used. Olefin, acrylic synthetic resin, epoxy synthetic resin, etc. can be used. Laminate The film is laminated to the object to be treated by a laminating device through thermocompression. It is preferable to apply an anchor coating agent as a pretreatment before the lamination process. The adhesive between the coating film and the object to be treated can be strengthened. For this purpose, an isocyanate type or the like may be used.

[0075] In this specification, heat sealing refers to sealing by heating and pressing the base film. The adhesive layer is partly coated on the laminate film, or the outermost or most layer with a low melting point of the laminate film. This refers to melting the inner layer with heat and bonding it under pressure.

[0076] The positive electrode current collector 201 and the negative electrode current collector 204 also serve as terminals for obtaining electrical contact with the outside. Therefore, as shown in FIG. 2(A), a positive electrode current collector 201 and a negative electrode current collector 20 4 is disposed so as to be exposed to the outside from the film 208 and the exterior body 209. When increasing the number of electrode layers and laminating them, multiple positive electrode current collectors 201 are electrically welded by ultrasonic welding. The negative electrode current collectors 204 are electrically connected to each other by ultrasonic welding. In FIG. 2B, a part of the negative electrode current collector 204 protrudes outward from the exterior body 209 and extends outward. is.

[0077] The laminated secondary battery thus obtained is placed in a region of the support structure 101 having a large radius of curvature. The substrate is attached from the area with the larger radius of curvature so that the substrate is fixed to the support structure 101. This can reduce damage to the secondary battery during charging.

[0078] FIG. 2(A) shows an example in which one film 208 and an exterior body 209 are used for sealing. There is no particular limitation, and a single film may be folded in the center to form an exterior body. An example different from that shown in FIG. 2(B) is shown in FIG. 10. The film 11 is folded in the center to separate the two ends. The structure is such that the two parts are overlapped and the three sides are sealed with an adhesive layer. The manufacturing method is as follows, using Figure 10. explain.

[0079] First, the film 11 is folded in the center to the state shown in FIG. As shown in FIG. 1, a positive electrode collector 12, a separator 13, and a negative electrode collector 14 are stacked to form a secondary battery. Then, a lead electrode 16 having a sealing layer 15 shown in FIG. The lead electrodes 16 are also called lead terminals and are connected to the positive or negative electrodes of the secondary battery. It is provided to pull out the positive electrode to the outside of the packaging film. The protruding portion of the positive electrode current collector 12 is electrically connected to the protruding portion of the positive electrode current collector 12 by ultrasonic welding or the like. The connecting lead electrode is made of aluminum. And the other lead electrode The protruding portion of the negative electrode current collector 14 is electrically connected to the negative electrode current collector 14 by ultrasonic welding or the like. The lead electrode connected to the protruding portion of 4 is made of nickel-plated copper. Then, two sides of the film 11 are heat-pressed to leave one side for inserting the electrolyte. During the thermocompression bonding, the sealing layer 15 provided on the lead electrode also melts, and the lead electrode and the filler are sealed. Then, the desired amount of the mixture is mixed in a reduced pressure atmosphere or an inert atmosphere. The electrolyte is dripped onto the inside of the bag-shaped film 11. Finally, the film is sealed without being heat-pressed. The remaining edge of the film is then sealed by heat pressing. The dotted line and end surface regions in FIG. 10(D) are bonded by thermocompression. This is the region 17. Also, an example of a cross section taken along the dashed line AB in FIG. 10(D) is shown in FIG. As shown in FIG. 10(E), a positive electrode current collector 12, a positive electrode active material layer 18, a separator 13, the negative electrode active material layer 19, and the negative electrode current collector 14 are laminated in this order to form a folded film. 11, and the ends are sealed with adhesive layers 30. The remaining space is filled with an electrolytic The liquid 20 is included.

[0080] Here, the flow of current during charging of a secondary battery will be explained with reference to FIG. When a secondary battery is considered as a closed circuit, the movement of lithium ions and the flow of electric current are in the same direction. In secondary batteries that use lithium, the anode and cathode are connected by charging and discharging. The cathode (cathode) is switched, and the oxidation and reduction reactions are switched, so the reaction potential The electrode with the higher reaction potential is called the positive electrode, and the electrode with the lower reaction potential is called the negative electrode. In this case, the charge / discharge current is always the same whether the battery is charging or discharging or a reverse pulse current is applied. Even when an electric current flows through the positive electrode, it is called the "positive electrode" or "+ electrode (plus electrode)" and the negative electrode is called the "negative electrode" or "-electrode (minus electrode)". When the terms anode and cathode are used, the difference between charging and discharging is , which can lead to confusion. The term "cathode" is not used in this specification. When using the terms negative electrode ( ) or cathode ( ), specify whether they are charging or discharging, and positive electrode ( It will also be indicated whether it corresponds to a positive pole or a negative pole.

[0081] A charger is connected to the two terminals shown in FIG. 10(F) to charge the secondary battery 40. As the charging of the battery 40 progresses, the potential difference between the electrodes increases. 0 toward the positive electrode current collector 12, and then, in the secondary battery 40, The current flows from the negative electrode collector 12 to the negative electrode current collector 14, and from the negative electrode to the external terminal of the secondary battery 40. The direction of the current is considered to be positive. In other words, the direction of the charging current is considered to be the direction of the current. do.

[0082] Next, a display module is prepared to be attached onto the secondary battery 103. This refers to a display panel that is at least equipped with an FPC. The display unit 102, the FPC 104, and a driving circuit are included, and power is supplied from a secondary battery 103. It is preferable to provide a converter for this purpose.

[0083] The display module has a display unit 102 that is flexible and has a display element on a flexible film. In addition, it is preferable to arrange the secondary battery 103 and the display unit 102 in a position where they partially overlap each other. By arranging them in a position where they overlap partially or completely, the distance from the secondary battery 103 to the display unit is The power path is shortened, i.e., the wiring distance is shortened, thereby reducing power consumption.

[0084] As a method for producing a display element on a flexible film, There are two methods: directly fabricating a display element on a substrate, and fabricating a display element on a substrate with rigidity such as a glass substrate. After forming the layer containing the display element, the substrate is removed by etching or polishing. A method of bonding a flexible film to a layer of the material, or a method of bonding a rigid substrate such as a glass substrate A peeling layer is provided on the display device, and a layer including a display element is formed thereon. After that, the peeling layer is used to form a rigid substrate. The layer including the display element is separated from the substrate, and the layer including the display element and a flexible film are There are ways to glue it on.

[0085] In this embodiment, the display unit 102 is an active matrix type display capable of high-definition display. In order to make the device, heat treatment at 400℃ or higher can be performed, and the reliability of the display element is improved. A method for producing the same, that is, a method for providing a release layer on a substrate having rigidity such as a glass substrate, The technology described in Patent Publication 2003-174153 is used.

[0086] The technology described in JP-A-2003-174153 allows the production of transistors with polysilicon as an active layer. A transistor using an oxide semiconductor layer is installed on a flexible substrate or film. In addition, these transistors can be used as switching elements to A photoluminescence element (EL element) is provided.

[0087] The general structure of an EL element is a light-emitting organic or inorganic compound between a pair of electrodes. A layer (hereinafter referred to as the "light-emitting layer") is sandwiched between the device, and a voltage is applied to the device. Electrons and holes are injected and transported from the counter electrode to the light-emitting layer, respectively. The recombination of carriers (electrons and holes) from the nuclei produces light-emitting organic or inorganic compounds. The organic compound forms an excited state, and emits light when the excited state returns to the ground state.

[0088] The types of excited states that organic compounds form are singlet excited states and triplet excited states. Light emission from the singlet excited state is called fluorescence, and light emission from the triplet excited state is called phosphorescence. It's been discovered.

[0089] Such light-emitting elements are usually formed as thin films of the order of submicrons to several microns. The major advantage is that it can be fabricated in a lightweight manner. The response time is only microseconds or less, making it extremely fast. Another feature is that sufficient light emission can be obtained with a DC voltage of several volts to several tens of volts. Therefore, power consumption is relatively low.

[0090] EL elements have a better viewing angle than liquid crystal elements, and when the display area has a curved surface, It is preferable as a display element for the display unit 102. In addition, unlike liquid crystal elements, it does not require a backlight. This allows for less power consumption, fewer parts, and a smaller total thickness. EL elements are preferable as the display element for display unit 102 because they can be made thin.

[0091] The method for producing a display element on a flexible film is described above (JP 2003-1 The method and materials for producing the EL element are not limited to those described in the above. Since known manufacturing methods and materials can be used, the description will be omitted here.

[0092] In addition, the display device used for the display unit 102 may be a simple monochromatic light source or a display of numbers only. In this case, the display device may be a passive matrix type display device. It is possible to fabricate a display element on a flexible film using a fabrication method other than the described technique. stomach.

[0093] The display module obtained by the above method is attached onto the secondary battery 103, and the secondary battery 103 is displayed. By electrically connecting the display unit 102, the electronic device 100 shown in FIG. 1(B) is completed. Furthermore, in order to improve the appearance of the electronic device 100, the parts other than the display unit 102 are covered with a metal cover or the like. Alternatively, it may be covered with a plastic cover or a rubber cover.

[0094] When the electronic device 100 is provided with a display unit, the screen size is set to a size that can be placed on the support structure. For example, when worn on the wrist, the circumference of an adult's wrist is 1 8cm±5cm, so the maximum screen size is 23cm around the wrist x the distance from the wrist to the elbow. In addition, the distance between an adult's wrist and elbow must be less than 1 foot (30.48 cm). The size of the wrist-worn electronic device is 23cm x 30.48cm, and it can be placed on a cylindrical support structure. The screen size mentioned here is the maximum screen size of the display unit of the 10.00. This refers to the size when the screen is flat, not the size when the screen is fully open. For example, the electronic device may have a second display unit smaller than the first display unit. The size of the support structure 101 is larger than the screen size of the display unit. When using an EL element, the screen size must be large enough to be placed on the support structure. If present, the total weight of the display panel and FPC alone can be between 1g and 10g.

[0095] In addition, the thinnest part of the electronic device in which the display unit is provided (the support structure 101 and the display unit 102) The thickness of the battery 103 and the battery pack 104 can be set to 5 mm or less. The thickest part of the FPC is the connection between the display panel and the FPC, but it must be less than 1 cm. can.

[0096] Additionally, the total weight of the electronic device 100 can be less than 100 g.

[0097] When the electronic device 100 is worn on the arm as shown in FIG. The electronic device 100 can be worn on the arm by moving a part of the support structure in the direction of the arm. The total weight is less than 100g, preferably less than 50g, and the thickest part is less than 1cm. As a result, it is possible to provide a lightweight electronic device.

[0098] In addition, as shown in FIG. 7A, the electronic device 100 has curved surfaces with different radii of curvature in cross section. 7A shows a center of curvature 700 and a center of curvature 701.

[0099] The radius of curvature of a surface will be described with reference to FIG. 9. In FIG. 9(A), a curved surface 1700 is cut. In the plane 1701, a part of the curve 1702 is approximated as an arc of a circle, and the radius of the circle is The radius of curvature is 1703, and the center of the circle is the center of curvature 1704. 9(C) shows a cross-sectional view of the curved surface 1700 cut by the plane 1701. When cutting a curved surface with a plane, the radius of curvature of the curve will differ depending on the plane used for cutting. When a surface is cut by a plane that has a curve with the smallest radius of curvature, the curvature of the curve is Let the radius be the radius of curvature of the surface.

[0100] The forearm contact surface of the exterior body on the inside (exposed back surface), and the film surface of the display panel on the outside (exposed front surface) When the electronic device 100 having the secondary battery is bent, the side closer to the center of curvature 1800 of the secondary battery The radius of curvature 1802 of the exterior body 1801 (exposed back surface) in contact with the support structure 1805 is The radius of curvature 1804 of the film 1803 on the side farther from the center 1800 is smaller than that of the film 1804 (FIG. 8(A) When the electronic device 100 is bent to have an arc-shaped cross section, the center of curvature 1800 of the exterior body is The exposed backside is subjected to compressive stress, and the exposed side of the film far from the center of curvature 1800 is subjected to tensile stress. In the electronic device 100, the exterior body 1801 closer to the center of curvature is subjected to stress (FIG. 8(B)). The radius of curvature of the .

[0101] The cross-sectional shape of the electronic device 100 is not limited to a simple arc shape. It may be formed into a shape having a circular arc, for example, the shape shown in FIG. 8(C). When the curved surface of the secondary battery has a shape having multiple centers of curvature, Among the radii of curvature in the above, the curvature of the exterior body 1801 is the smallest in the curved surface. The radius of curvature of the surface closer to the center is 10 mm or more, preferably 30 mm or more. The child device 100 can be transformed.

[0102] FIG. 7B is a bottom view of the electronic device 100 as seen from the exposed back surface of the support structure. A side view of the electronic device 100 is shown in FIG.

[0103] (Embodiment 2) In this embodiment, an example of a method for charging a secondary battery using an antenna will be shown. .

[0104] For safety reasons, the input / output terminals for charging or discharging the secondary battery are exposed so that they may come into contact with parts of the human body. If the input / output terminals are exposed, rain or other water may damage the input / output terminals. There is a risk of short circuiting the power cord or electric shock if the input / output terminals come into contact with the human body. In this case, the input / output terminals can be configured not to be exposed on the surface of the electronic device.

[0105] The present embodiment is the same as the first embodiment except that an antenna and an RF power supply converter are provided. Therefore, other detailed explanations will be omitted here.

[0106] According to the first embodiment, a flexible secondary battery is fixed on a support structure, and a A display module is attached. The RF power supply converter and amplifier are electrically connected to the secondary battery. Also, fix the RF power supply converter so that it partially overlaps with the display unit.

[0107] The RF power supply converter and antenna weigh less than 10g, and the total weight is almost the same as in the first embodiment. The weight can be made the same.

[0108] FIG. 3 shows a schematic diagram of an electronic device 300 having an antenna (not shown) and a charger 301. When the electronic device 300 is placed on the charger 301, power is supplied from the antenna of the charger 301. The power can be supplied to the child device 300 to charge the secondary battery of the electronic device 300.

[0109] In addition, information such as the remaining charge and the remaining time until full charge is displayed on the display unit of the electronic device 300. It is possible to show

[0110] This embodiment mode can be freely combined with the first embodiment mode.

[0111] (Embodiment 3) In this embodiment, the risk of wrinkles and electrolyte leakage that may occur when the secondary battery is curved is eliminated. An example of a configuration to improve this is shown in FIG.

[0112] In the first embodiment, the secondary battery is sealed with a laminate film, and the periphery is sealed at one place (cross section Therefore, the secondary battery is not subject to repeated bending or impact. If even one part of the battery cannot be sealed when it is given, the electrolyte inside will leak out. If the product is fixed in one place when it is repeatedly bent or subjected to impact, the bending strain The rust will concentrate in that one spot and sealing will not be possible.

[0113] Therefore, in this embodiment, two films are fixed at two points as shown in FIG. 4(A). FIG. 4 shows a schematic cross-sectional view of a secondary battery 400 in which the positive and negative electrodes are sealed with two films. The two-point fastening relieves bending stress and helps maintain the seal. do.

[0114] FIG. 4B shows a configuration example different from that of the first embodiment.

[0115] In FIG. 4B, a display unit 402 is provided on the front side of a support structure 401, and a secondary battery 4 is provided on the back side. Here is an example of placing 00.

[0116] In FIG. 4B, an opening is provided in the support structure 401, and a display unit 402 extends from the support structure 401. The FPC 403 and the FPC 404 extending from the secondary battery are electrically connected through an opening. do.

[0117] In this embodiment, the size of the opening provided in the support structure 401 is not particularly limited, and the opening may be formed in any size as long as it has a sufficient mechanical strength. If a certain degree of space can be secured, the area may be larger than the display unit 402. In this case, the secondary battery 400 and the display unit may be inserted into the opening. The larger the opening, the less the weight of the support structure. Since the weight can be reduced, the total weight can be reduced.

[0118] This embodiment mode can be freely combined with the first embodiment mode. EXAMPLES

[0119] An electronic device manufactured according to the first embodiment, displaying an image on the display unit, and being worn on the wrist A photograph of the vessel is shown in Figure 5.

[0120] The dimensions of the electronic device shown in FIG. 5 are 60 mm in width, 77 mm in length, and 57 mm in depth. The dimensions are determined by the stainless steel structure. The outer dimensions of the display panel are 51.5mm x 9 The screen size is 2.15 mm and the display area is 42.12 mm x 74.88 mm. The weight is between 40g and 50g, and the total weight of the display panel and FPC alone is approximately 2g. In this specification, FPC stands for flexible printed circuit board. There are multiple metal foils (Cu, Ni, The tips of the multiple metal foil patterns are aligned horizontally. The anisotropic conductive film (ACF) for pressure bonding is formed along the edge of the tip of the FPC, so that it cuts the edge. The external connection terminals on the display panel and the FPC are connected using the ACF formed on the FPC. The electrical connection is achieved by crimping the wires.

[0121] In addition, a laminated secondary battery is used as the secondary battery, and iron phosphate is used as the positive electrode active material. Lithium iron phosphate (LiFePO4) is a highly safe secondary battery. It is possible.

[0122] A schematic cross-sectional view of the secondary battery used is shown in Figure 6. This secondary battery has a sheet-shaped positive electrode current collector. A positive electrode active material layer 602 in the form of a sheet, a separator 607, and a negative electrode current collector 604. Then, a negative electrode active material layer 605 is laminated, and the other regions are filled with an electrolyte solution 610. The sensor element 604 is housed in an exterior body 609 made of a film having a recess and a film having a recess.

[0123] As shown in Fig. 6, the number of electrode layers is 16. The electrode 601 has eight layers, making a total of 16 layers. Since the surface is shown, eight layers of negative electrode current collector 604 are ultrasonically bonded.

[0124] In addition, the thinnest part of the electronic device in which the display unit is provided (the supporting structure, the display unit, and the secondary battery) The thickness of the overlapping parts is 3.2 mm. The thickest part of the electronic device is the display panel. This is the connection part with the FPC (the area where the external connection terminals are provided) and is 6 mm. It is also possible to directly attach the C chip, passive electronic components, etc. to the FPC. In this case, IC chips and other components are not considered to be part of the FPC. Any passive electronic components, IC chips for driving circuits, CPU, memory, etc. are directly attached. When provided on an FPC, that part may become the thickest part of the electronic device.

[0125] In this embodiment, lithium iron phosphate is used as the positive electrode active material. The structure of the secondary battery that increases the energy density, for example, the positive electrode active material and the negative electrode active material By appropriately changing the materials, further miniaturization and weight reduction can be achieved. If lithium cobalt oxide (LiCoO2) is used as the material, the volumetric energy density is high. Therefore, if a secondary battery with the same capacity as that of this embodiment is manufactured, the thickness and weight can be further reduced. It can be made even lighter.

[0126] The power required to display the images shown in Figure 5 is supplied only from the secondary battery that overlaps the display unit. .

[0127] Of course, the image displayed on the display in Figure 5 is not a processed image, but is actually displayed in full color. The resolution of the display in Figure 5 is 326 ppi, with three transistors per pixel. These transistors are made of oxide semiconductor (InGaO3 (ZnO) m )of The end of the support structure is provided with connection terminals for charging and inputting display image signals. When the user is not using the device, i.e. when charging or inputting display video signals, an external charger is required. The device is connected to an external drive device. Also, when the user uses the device, i.e., when the user wears the device on his / her arm, However, when the display is on, the wiring or other cords are not connected to the external drive device.

[0128] The electronic device shown in Figure 5 has a total weight of less than 50g, is light when worn on the wrist, and has a stylish appearance. It has excellent insulating properties and can be used as an accessory. [Explanation of symbols]

[0129] 100 Electronic equipment 101 Support structure 102 Display section 103 Secondary battery 104 FPC 105 Arrow 201 Positive electrode current collector 202 Cathode active material layer 203 Positive electrode 204 Negative electrode current collector 205 Negative electrode active material layer 206 Negative electrode 207 Separator 208 Film 209 Exterior body 210 Electrolyte 300 Electronic equipment 301 charger 400 Secondary battery 401 Support Structure 402 Display section 403 FPC 404 FPC 601 Positive electrode current collector 602 Positive electrode active material layer 604 Negative electrode current collector 605 Negative electrode active material layer 607 Separator 608 Film 609 Exterior body 610 Electrolyte

Claims

1. An electronic device having a curved structure, a flexible secondary battery, and a flexible display unit, the structure has a first portion having a first radius of curvature, a second portion having a second radius of curvature greater than the first radius of curvature, and a third portion having a third radius of curvature less than the second radius of curvature; the secondary battery is disposed in the second portion so as to have an area overlapping with the display unit, When the electronic device is placed so as to overlap a charger, the secondary battery has a function of charging with power from the charger.

2. An electronic device having a curved structure, a lithium ion secondary battery, and a flexible display unit, the structure has a first portion having a first radius of curvature, a second portion having a second radius of curvature greater than the first radius of curvature, and a third portion having a third radius of curvature less than the second radius of curvature; the lithium ion secondary battery is disposed in the second portion so as to have an area overlapping with the display unit, When the electronic device is placed so as to overlap a charger, the lithium ion secondary battery has a function of charging with power from the charger.

Images