electronic machines

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, "electronic device" refers to all devices that have a secondary battery. Electro-optical devices and information terminal devices with secondary batteries are all electronic devices. [Background technology]

[0003] In recent years, display devices that are worn on the human body, such as display devices worn on the head, have been proposed. These are called mounted displays or wearable displays. They are not limited to display devices. Furthermore, electronic devices worn on the human body, such as hearing aids, are required to be lighter and smaller. It is.

[0004] Furthermore, along with the reduction in the weight of electronic devices, the batteries that supply power to these devices are also becoming lighter, and There is a demand for miniaturization.

[0005] Furthermore, ebooks equipped with a flexible display device are disclosed in Patent Document 1 and Patent Document 2. It is. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2010-282181 [Patent Document 2] Japanese Patent Publication No. 2010-282183 [Overview of the project] [Problems that the invention aims to solve]

[0007] To ensure a comfortable fit for the user, display devices worn on the human body are made lighter. Furthermore, there is a demand for miniaturization, as well as the weight reduction of the entire electronic device, including the drive unit and power supply of the display device. This is required.

[0008] We propose an electronic device with a novel form, specifically an arm-worn electronic device that is worn on the arm. We propose a rechargeable battery that can be worn on the arm. [Means for solving the problem]

[0009] A curved structure that is in contact with a part of the human body is used as a support structure, and the support structure is flexible. To realize an arm-mounted secondary battery in which a secondary battery having properties is fixed along a curved surface. To make secondary batteries more flexible, the thickness of the battery is reduced, specifically to improve the volumetric energy density. Therefore, it is preferable to use a secondary battery with a small number of electrode layers. A small number of electrode layers means that the positive electrode When stacking multiple electrode pairs, with the negative electrode and the negative electrode stacked on top of each other, even if the number of layers is small, or if it is a wound-type battery This refers to the number of winding cycles required. Also, the maximum thickness of a wrist-worn rechargeable battery is less than 1 cm. It is preferable to make it thin.

[0010] This example shows a configuration in which a band-shaped secondary battery is worn on the arm, and the secondary battery is provided on the support structure. The battery has an arched cross-sectional shape, and when installed, the ends of the support structure flex, The ends of the secondary battery also bend. The ends of the secondary battery also bend, but because the secondary battery is flexible, two The battery's casing will not be damaged, and its performance will be maintained.

[0011] The configuration disclosed herein comprises a structure having a curved surface, and at least a portion of the curved surface of the structure. It has a rechargeable battery that is in contact with and whose outer casing is a film and is flexible, and on the curved surface of the structure It is an electronic device that attaches to the user's arm.

[0012] A flexible secondary battery has a film casing, and the curved portion that is attached to the structure is further processed. It can be deformed accordingly. The area enclosed by the outer casing contains the positive electrode, negative electrode, and electrolyte in small quantities. Even if they don't have it, they do. Especially as a secondary battery, it can achieve high energy density, and therefore lightweight. It is preferable to use a lithium-ion secondary battery that can be made smaller and more compact.

[0013] The above configuration involves providing a structure in contact with the arm, and providing a flexible secondary battery on the structure. This is an example, but is not particularly limited, and may include a configuration in which a flexible secondary battery is provided between the structure and the arm. This is also possible. In that case, the configuration would be a structure having a curved surface and at least a part of the structure A rechargeable battery that is in contact with a curved surface and whose outer casing is a film, and has flexibility, film It is an electronic device that is attached to the user's arm and worn in contact with the device.

[0014] In addition to the above configuration, a display unit may be provided. In that case, the configuration may have a curved surface. A structure, a film exterior on the curved surface of the structure, a flexible secondary battery, and a secondary A display unit including multiple display elements sandwiched between a pair of films on top of a battery, and a secondary display unit including multiple display elements and Batteries are electronic devices that overlap in some way.

[0015] The larger the area where multiple display elements and secondary batteries overlap, the more heat generated by the display elements can be used for two The next step is to warm the battery. Lithium-ion secondary batteries have difficulty operating at low temperatures, especially in cold climates. Therefore, warming is important. Also, because it is worn on the arm, the arm and the display element are sandwiched together. This allows for efficient heating of the secondary battery from both its front and back surfaces. A material with high thermal conductivity may be used as the material for the structure to effectively heat the secondary battery.

[0016] Furthermore, the secondary battery may be configured to come into contact with the arm, and this configuration may involve a structure having a curved surface. It contacts at least a portion of the curved surface of the structure, and the outer covering is a film that is flexible. It is an electronic device that has a rechargeable battery and is worn on the user's arm in contact with a film. The secondary battery is heated by contact with it.

[0017] In each of the above configurations, one of the pair of films that sandwich the display section containing multiple display elements, i.e., the structure The film closest to the body may be made of metal, such as stainless steel film.

[0018] In each of the above configurations, the display unit is an active display unit in which multiple display elements are arranged in a matrix. It is preferable to use a matrix-type display device. The display elements may include organic light-emitting elements and electric elements. While small inks can be used, organic light-emitting elements are particularly thin, with a thickness of 3 mm or less, and It is preferable because it can be made lighter.

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

[0020] Furthermore, in each of the above configurations, in addition to the display device, other semiconductor circuits may be included, for example, to prevent overcharging. Control circuits, image sensors, gyroscopes, accelerometers, and other sensors, touch A control panel or similar device may be provided. For example, by mounting an image sensor in addition to the display device, The projected image can be displayed on a display device. Additionally, a gyroscope and an accelerometer can be used. By incorporating sensors such as siren, the on / off status of the arm-worn electronic device can be determined by its orientation and movement. It can be switched to an off state to save power. Also, it is equipped with a touch panel. Then, by touching the desired location on the touch panel, you can operate the electronic device or input information. This is possible. Furthermore, in the above configuration, in addition to the display device, memory and a CPU can be installed. This also makes it possible to realize wearable computers.

[0021] Furthermore, an antenna may be provided, and its configuration may consist of a structure having a curved surface and the structure A rechargeable battery that is in contact with at least some curved surfaces, has a film casing, and is flexible. It has a secondary battery and an antenna that is electrically connected to it, and it is in contact with the curved surface of the structure and on the user's arm. It is an electronic device that is worn on the body.

[0022] Using an antenna makes it possible to charge secondary batteries without contact. (Charger antenna (primary battery) The coil (secondary coil) and the antenna (secondary coil) of the electronic device are magnetically coupled, and the power generated from the primary coil is... By using an electromagnetic induction method that generates voltage in the secondary coil with an alternating magnetic field, the secondary coil can be operated without contact. Charging is performed by a mechanism that transmits power to the side. The antenna is in contact with the curved surface of the structure. Since it is preferable to provide it, the antenna of the electronic device is also provided on a flexible film. It is preferable.

[0023] When an antenna is attached to an arm-worn rechargeable battery, it is limited to contactless charging of the rechargeable battery. Furthermore, it is possible to add memory to transmit and receive electronic data, or to incorporate GPS functionality to determine location. An antenna is installed that can acquire information and GPS time to display location and time. That's fine.

[0024] Furthermore, an antenna and a transmitting / receiving circuit that can be used as an active tag are provided, and the arm is equipped with A rechargeable battery can be used as an active tag. An active tag is a wireless IC tag. It refers to an IC tag, a type of RFID (Radio Frequency Identification) tag, that has a built-in battery and is capable of communication.

[0025] It also functions as a backup secondary battery to supply power to mobile devices. On mobile information terminals such as the Nintendo eShop, you can wait for incoming emails or phone calls without turning off the power. Because it's carried around, the battery capacity decreases over time, eventually rendering it unusable. Furthermore, if you try to give a mobile information terminal various functions such as a camera or sensors... The more weight reduction is achieved, the more difficult it becomes, and the smaller the space allocated to the secondary battery becomes. Even if the performance of the rechargeable battery built into the mobile information terminal improves, repeated use will not be possible. Therefore, the degradation of rechargeable batteries is unavoidable, and high-performance rechargeable batteries are very expensive.

[0026] Of course, I purchased a spare rechargeable battery that is the same as the one built into the mobile device. You may carry it with you at all times, but depending on the mobile device, for security reasons, the user's freedom Many portable information terminals are designed with non-replaceable batteries. Charging modules for portable information terminals are also sold, but their size is not suitable for portable devices. It is the same size as or larger than an information terminal, and its weight exceeds that of a mobile information terminal, specifically 15 It must weigh 0g or more. Also, a spare rechargeable battery should always be kept in the user's pocket or bag. It is necessary to have it with you, especially in situations where your clothing doesn't have pockets or where you can't carry a bag. It is difficult to do.

[0027] If you also have an arm-mounted rechargeable battery, you can use it when the rechargeable battery of your mobile device runs out. It can also be used as an auxiliary power source. Furthermore, if worn on the arm, a spare rechargeable battery can be used. It is convenient because it does not need to be kept in the user's pocket or bag. The design is aesthetically pleasing when the battery is installed, and when an image is displayed on the display, the image is displayed. Because the display unit and the secondary battery overlap, the secondary battery is hidden, or in other words, camouflaged. Furthermore, others did not perceive the electronic device worn on the arm as a spare rechargeable battery, and the person wearing it on their arm... It should not feel out of place as a piece of clothing. In particular, for women, it should not be worn with clothing that does not have pockets. This is often the case, and since people are also concerned about how it looks when worn, it is an effective solution.

[0028] If a display unit is attached to a wrist-worn rechargeable battery and it displays in full color, then that wrist-worn rechargeable battery will It can be called an arm-mounted photo frame. The user can insert their favorite image (photo). (and so on) can be displayed on a wrist-worn rechargeable battery.

[0029] Also, depending on the capacity of the rechargeable battery, arm-worn rechargeable batteries are lighter and more compact overall. The weight of the product shall be less than 150g, preferably 100g or less, and more preferably 50g or less. This is possible. When used as an auxiliary power source, it is not necessary to keep the power on at all times. Keeping the power off can help prevent a decrease in battery capacity.

[0030] Furthermore, if the primary purpose is to use it as a spare secondary battery, there is no need for a full-color display. The display could be either monochrome or monocolor, and the display unit could only show the battery level. That's fine.

[0031] Furthermore, in the above configuration, the support structure can be made of metal or resin. The main part of the support structure may be metal with some resin used, or the main part of the support structure may be resin You may use some metal in addition to the oil. Suitable metals include stainless steel, aluminum, and titanium alloys. These can be used. In addition, acrylic resin, polyimide resin, etc. can be used as resins. It is possible to use natural materials as the material for the support structure. Materials that can be used include wood, stone, bone, leather, paper, and processed cloth. [Effects of the Invention]

[0032] Even with a display unit added to the arm-worn rechargeable battery, the thickest part is less than 1 cm, and it weighs 50g. The following lightweight electronic devices can be provided. They can be worn on the arm, and both hands can be used. It can provide an ideal electronic device that can be carried without obstructing the view. Also, a wrist-mounted type... The battery's display can show an image, making it usable as a fashion accessory. [Brief explanation of the drawing]

[0033] [Figure 1] These are a cross-sectional view and a perspective view illustrating one aspect of the present invention. [Figure 2] These are a top view and a cross-sectional view showing one aspect of the present invention. [Figure 3] This is a perspective view showing one aspect of the present invention. [Figure 4] This is a cross-sectional view showing one aspect of the present invention. [Figure 5] This is a photographic diagram illustrating one aspect of the present invention. [Figure 6] This is a cross-sectional view showing one aspect of the present invention. [Figure 7] These are a cross-sectional view, a bottom view, and a side view illustrating one aspect of the present invention. [Figure 8] This is a diagram illustrating the center of curvature. [Figure 9] This is a diagram illustrating the radius of curvature of a surface. [Figure 10] These are perspective views and cross-sectional views illustrating one aspect of the present invention. [Modes for carrying out the invention]

[0034] The embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is... Not limited to the following description, the form and details can be modified in various ways, as any person skilled in the art would know. This is easily understood. Furthermore, the present invention shall be interpreted as being limited to the contents of the embodiments described below. It's not something that can be done.

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

[0036] As shown in Figure 1(A), the electronic device 100 has flexibility on the curved surface of the support structure 101. 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 curved bracelet made from a strip-shaped structure. 01 is at least partially flexible, and can be moved in the direction of arrow 105. It can be worn around the neck. The support structure 101 shown in Figure 1(A) has a structure that allows its ends to bend. The central part, which is far from the edges, hardly fluctuates. Therefore, the support structure In the central part of 101, the curvature remains the same as when it was attached and fixed during manufacturing, and when attached to the arm. Even with repeated use, the secondary battery 103 and display unit 102, which overlap in the central part, suffer little damage.

[0038] Furthermore, if an active matrix display device is provided in the display unit, the active matrix display The device has at least a layer containing transistors. The layer containing transistors is a support structure. If it is simply attached and fixed to the curved surface of body 101, reliability is unlikely to decrease, but Transis The layer containing the material is bent and curved in one direction to form a concave surface, then returned to a flat surface, and then... Furthermore, repeatedly bending it in another direction to create a convex surface may reduce reliability. In that sense, the support structure 101 shown in Figure 1(A) is almost constant in the central part. Therefore, by fixing it to the curved surface of the support structure 101, even if it does bend, it will only bend in one direction. It can be configured to simply bend. That is, the support structure 101 is the display unit 102 and the secondary power A protective material to prevent pond 103 from warping too much or from undergoing large twisting deformation. It functions.

[0039] The material of the support structure 101 can be metal, resin, natural material, etc. for weight reduction. Therefore, it is preferable to make it thin. If metal is used as the material for the support structure 101, It has excellent impact resistance and high thermal conductivity, which is desirable. Furthermore, resin is used as the material for the support structure 101. Using this material allows for weight reduction and avoids causing metal allergies.

[0040] The shape of the electronic device shown in Figure 1(B) is just one example, and it may include a belt or fastener for securing it to the wrist. A metal fitting may be provided. Alternatively, it may be a ring-shaped or cylindrical electronic device surrounding the wrist. stomach.

[0041] Furthermore, the example given is that it can be worn on the arm, such as the wrist (including the forearm) or upper arm. It is not limited to any part of the human body; for example, it may be attached to the waist or ankle. (Attached to the ankle) If you do so, the shape should be different from the shape shown in Figure 1, and it should be made to a size that fits the shape of the ankle. Yes, that's fine. If it's to be worn around the waist, it should be made in a size that can be wrapped around the waist like a belt. .

[0042] The following is an example of a method for manufacturing electronic device 100.

[0043] First, prepare the support structure 101. The support structure 101 has a radius of curvature in its cross-section. A stainless steel material is used in which the large area hardly deforms, and the ends flex. By using a special material, the display unit 102 and secondary battery 103 will not bend excessively, or large bones will be avoided. It acts as a protective material to prevent twisting and deformation. Also, the deformation when worn on the arm remains constant, i.e. Unidirectional deflection also contributes to improved reliability.

[0044] Next, prepare a secondary battery 103 to be attached to the region of the support structure 101 with a large radius of curvature. ru.

[0045] The secondary battery 103 is a lithium-ion secondary battery, and if it is flexible, then it is particularly It is not limited to the above. A flexible secondary battery is one in which the outer casing is a thin, flexible film. This allows the support structure 101 to deform in accordance with the curved surface portion in the region with a large radius of curvature. Cut.

[0046] In this embodiment, an example is given in which a laminate-type secondary battery is used as a flexible secondary battery. Figure 2(A) shows the top surface of a laminated secondary battery. Also, the dashed line A in Figure 2(A) Figure 2(B) is a schematic diagram of the cross-section obtained by cutting at -B.

[0047] A sheet-shaped positive electrode 203, a separator 207, and a sheet-shaped negative electrode 206 are stacked together, The remaining areas are filled with electrolyte 210, and these are enclosed in an outer casing consisting of one or two films. The contained secondary battery is used. The positive electrode 203 consists of the positive electrode current collector 201 and the positive electrode active material layer 2 It has 02. The negative electrode 206 also 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, and zinc. Metals such as iron, nickel, copper, aluminum, titanium, tantalum, and their alloys, etc. Furthermore, materials with high conductivity that do not alloy with carrier ions such as lithium can be used. Furthermore, the heat resistance of materials such as silicon, titanium, neodymium, scandium, and molybdenum has been improved. Aluminum alloys to which elements that react with silicon can be used. It may be formed from a metallic element that reacts with silicon to form a silicide. The metallic elements that make it up include zirconium, titanium, hafnium, vanadium, niobium, and Examples include tungsten, chromium, molybdenum, cobalt, and nickel. (Positive electrode current collector) 201 and the negative electrode current collector 204 are foil-shaped, plate-shaped (sheet-shaped), mesh-shaped, cylindrical, coil-shaped, Shapes such as perforated metal or expanded metal can be used as appropriate. Positive electrode cluster The current collector 201 and the negative electrode current collector 204 shall have a thickness of 10 μm or more and 30 μm or less. That's good.

[0049] The positive electrode active material layer 202 is made of a material that allows for the insertion and removal of lithium ions. This can result in, for example, olivine-type crystal structures, layered rock salt-type crystal structures, or spinel-type crystal structures. Examples include lithium-containing materials having a crystalline structure. Examples of positive electrode active materials include 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(I I), Mn(II), Co(II), Ni(II))), there are Li FePO4, LiNiPO4, LiCoPO4, LiMnPO4, LiFe

[0051] , d , e , , c , , , h , , f , , , e , c , , d , , i , , g ,

[0052] 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 satisfies, in a balanced manner, the requirements for a cathode 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 crystalline structure include lithium cobalt oxide. (LiCoO2), LiNiO2, LiMnO2, Li2MnO3, LiNi 0.8 Co 0.2 NiCo-based compounds such as O2 (the general formula is LiNi x Co 1-x O2(0 <x<1))、L iEn 0.5 Mn 0.5 NiMn-based materials such as O2 (general formula: LiNi x Mn 1-x O2(0 <x<1))、LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 NiMnCo-based (NMC) such as O2 It is also called LiNi x Mn y Co 1-x-y O2(x>0, y>0, x+y<1) )) is also present. Furthermore, Li(Ni 0.8 Co 0.15 Al 0.05 )O2,Li2MnO Examples include 3-LiMO2 (M=Co, Ni, Mn).

[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 etc be.

[0054] Lithium-containing materials having a spinel-type crystal structure containing manganese, such as LiMn2O4, A small amount of lithium nickelate (LiNiO2 or LiNi 1-x MO2 (M = Co, Al, etc.) Mixing it has advantages such as suppressing manganese elution and suppressing the decomposition of the electrolyte, making it preferable. It seems so.

[0055] Furthermore, as the positive electrode active material, Li (2-j) MSiO4 (where M is Fe(II), Mn Lithium-containing materials such as (II), Co(II), Ni(II) (one or more, 0≦j≦2) It can be used. General formula 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 Si O4, Li (2-j) Ni m Co n Mn q SiO4(m+n+q is less than or equal to 1, 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) of the general formula can be used. As the NASICON type compound, there are Fe2(MnO4) 3, Fe2(SO4)3, Li3Fe2(PO4)3, etc. Also, as the positive electrode active material Li2MPO4F, Li2MP2O7, Li5MO4 (M = Fe, Mn) of the general formula represented compounds, 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. In addition to the above-mentioned positive electrode active material, the positive electrode active material layer 202 may also have a binder for enhancing the adhesion of the active material and a conductive aid for enhancing the conductivity of the positive electrode active material layer 202.

[0057] For the negative electrode active material layer 205, materials capable of lithium dissolution and precipitation or lithium ion insertion and desorption can be used, and lithium metal, carbon-based materials, alloy-based materials, etc. can be used. Lithium metal has a low redox potential (-3.045V with respect to the standard hydrogen electrode), weight and also.

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

[0059] Lithium metal has a low redox potential (-3.045V with respect to the standard hydrogen electrode), weight and They have a high specific capacity per unit volume (3860mAh / g and 2062mAh / cm³, respectively). 3 Therefore, it is preferable.

[0060] Carbon-based materials include graphite, easily graphitizable carbon (soft carbon), and poorly graphitizable carbon (hard carbon). Examples include carbon dioxide, carbon nanotubes, graphene, and carbon black.

[0061] Graphite includes mesocarbon microbeads (MCMB), coke-based artificial graphite, and pitch. There are artificial graphites such as synthetic graphite and natural graphites such as spheroidized natural graphite.

[0062] Graphite is formed when lithium ions are inserted into graphite (during the formation of lithium-graphite intercalation compounds). It exhibits a low potential similar to lithium metal (0.1~0.3V vs. Li / Li + ).child As a result, lithium-ion secondary batteries can exhibit a high operating voltage. Furthermore, graphite It has a relatively high capacity per unit volume, low volume expansion, is inexpensive, and is made of lithium metal. It is preferable because it has advantages such as higher safety compared to other options.

[0063] As a negative electrode active material, it is possible to perform charge and discharge reactions through alloying and dealloying reactions with lithium. A combination of alloy materials can also be used. When the carrier ion is a lithium ion, Examples of gold-based materials include Mg, Ca, Al, Si, Ge, Sn, Pb, Sb, Bi, and A. There is a material that contains at least one of g, Au, Zn, Cd, In, Ga, etc. These elements have a much larger capacity than carbon, and silicon in particular has a theoretical capacity of 4200 mAh / g. It is dramatically high. For this reason, it is preferable to use silicon as the negative electrode active material. Such elements Examples of alloy-based materials using this include, for example, SiO, Mg2Si, Mg2Ge, SnO, Sn O2, Mg2Sn, SnS2, V2Sn3, FeSn2, CoSn2, Ni3Sn2, C u6Sn5, Ag3Sn, Ag3Sb, Ni2MnSb, CeSb3, LaSn3, La 3Co2Sn7, CoSb3, InSb, SbSn, etc. Note that SiO refers to a powder of silicon oxide containing a silicon-rich portion, and SiO (2 > y > 0) can also be expressed as such. For example, SiO can be a material containing a single or multiple substances selected from Si2O3, Si3O4, or Si2O, or a mixture of Si powder and silicon dioxide SiO2. Also, Si y O may contain other elements (such as carbon, nitrogen, iron, aluminum, copper, titanium, calcium, manganese, etc.). That is, it refers to a material containing a plurality selected from single crystal Si, amorphous Si, polycrystalline Si, Si2O3, Si3O4, Si2O, SiO2, and SiO is a colored material. If it is SiO (X ≥ 2), it is colorless and transparent or white and can be distinguished. However, when a secondary battery is fabricated using SiO as a material for the negative electrode active material and then charged and discharged repeatedly, SiO may be oxidized and converted to SiO2 in some cases. In addition, as the negative electrode active material, oxides such as titanium dioxide (TiO2), lithium titanate (Li4T i5O ), lithium-graphite intercalation compound, (Li C6), niobium pentoxide (Nb2O5 x ), tungsten oxide (WO2), molybdenum oxide (MoO2), etc. can be used.

[0064] i5O 12 ), lithium-graphite intercalation compound, (Li x C6), niobium pentoxide (Nb2O5 ), tungsten oxide (WO2), molybdenum oxide (MoO2), etc. can be used.

[0065] ​​​​​Also, as the negative electrode active material, a Li3N-type structure, which is a complex nitride of lithium and a transition metal, can be used. Li 3-x M x N (M = Co, Ni, Cu) can be used. For example, Li 2.6 Co 0.4 N3 exhibits a large charge-discharge capacity (900 mAh / g, 1890 mAh / cm 3 ) and is preferable. Preferably.

[0066] When using a complex nitride of lithium and a transition metal, since lithium ions are contained in the negative electrode active material, it can be preferably combined with materials such as V2O5 and Cr3O8 that do not contain lithium ions as the positive electrode active material. Even when using a material containing lithium ions for the positive electrode active material, it is possible to use a complex nitride of lithium and a transition metal by previously desorbing the lithium ions contained in the positive electrode active material to form a negative electrode active material. By desorbing the lithium ions contained in the positive electrode active material in advance, a complex nitride of lithium and a transition metal can be used as the negative electrode active material. Preferably.

[0067] Also, a material that undergoes a conversion reaction can be used as the negative electrode active material. For example, [[ID=三十二]] transition metal oxides such as cobalt oxide (CoO), nickel oxide (NiO), and iron oxide (FeO), which do not alloy with lithium, may be used as the negative electrode active material. As materials that undergo a conversion reaction, further, oxides such as Fe2O3, CuO, Cu2O, RuO2, and Cr, 2O3, sulfides such as CoS, NiS, and CuS, nitrides such as Zn3N2, Cu3N, and G m >e3N4, phosphides such as NiP2, FeP2, and CoP3, and fluorides such as FeF3 and BiF3 also occur. Since the potential of the above fluorides is high, they may be used as the positive electrode active material. Since the potential of the above fluorides is high, they may be used as the positive electrode active material. Preferably.

[0068] Also, in the negative electrode active material layer 205, in addition to the above-described negative electrode active material, in order to enhance the adhesion of the active material, It has a binder, a conductive additive to enhance the conductivity of the negative electrode active material layer 205, etc. That's good too.

[0069] The electrolyte 210 contains lithium ions as the solute of the electrolyte, which are carrier ions. Materials are used. Typical examples of electrolytes include LiPF6, LiClO4, and Li(FSO4). 2)2N, LiAsF6, LiBF4, LiCF3SO3, Li(CF3SO2)2N, Lithium salts such as Li(C2F5SO2)2N exist. These electrolytes can be used individually. They may be used individually, and two or more may be used in any combination and ratio. Also, the reaction product To make it more stable, a small amount (1 wt%) of vinylene carbonate (VC) is added to the electrolyte. This may further reduce the decomposition of the electrolyte.

[0070] Furthermore, a material capable of transporting carrier ions is used as the solvent for the electrolyte 210. As the solvent for the liquid, an aprotic organic solvent is preferred. Typical examples of aprotic organic solvents are For example, ethylene carbonate (EC), propylene carbonate, dimethyl carbonate Diethyl carbonate (DEC), γ-butyrolactone, acetonitrile, dimethyl carbonate Examples include cyethane and tetrahydrofuran, and one or more of these can be used. Furthermore, by using a polymer material that gels as the solvent for the electrolyte, leakage can be addressed. Safety is enhanced. Furthermore, it enables the secondary battery to be made thinner and lighter. (Gelated polymer) Typical examples of materials include silicone gel, acrylic gel, acrylonitrile gel, and polyethylene. Examples include ethylene oxide, polypropylene oxide, and fluorine-based polymers. Also, electrolysis... One or more flame-retardant and non-volatile ionic liquids (room-temperature molten salts) are used as the solvent for the liquid. By using this, even if the internal temperature of the secondary battery rises due to an internal short circuit or overcharging, the secondary battery will still function properly. It can prevent the pond from bursting or catching fire.

[0071] The separator 207 can be cellulose (paper) or polypropylene with voids. Insulators such as polyethylene can be used.

[0072] Figure 2(B) shows an example where the number of electrode layers is 2 (two layers: positive electrode 203 and negative electrode 206). However, if you want to reduce the area (size) of a secondary battery while maintaining its capacity, By increasing the number of polarity layers to more than two, the size of the secondary battery can be reduced. However, the electrodes If the number of layers exceeds 40, the thickness of the secondary battery increases, which may impair its flexibility, therefore the electrode layer The number shall be 40 or less, preferably 20 or less. Also, a positive electrode active material layer 20 shall be placed on both sides of the positive electrode current collector. When applying 2 to both sides, or when applying the negative electrode active material layer 205 to both sides of the negative electrode current collector 204 When performing double-sided coating, the number of electrode layers should be reduced to 10 or less while maintaining the capacity of the secondary battery. It can also be reduced.

[0073] The lamination of the sheet-shaped positive electrode 203, the separator 207, and the sheet-shaped negative electrode 206 is The seal is created by performing a sealing process.

[0074] The rechargeable battery uses a thin, flexible film (e.g., laminate film) as its outer casing. To use. A laminate film is a laminated film made of a base film and an adhesive synthetic resin film. This refers to a film, or a laminated film made of two or more different materials. Examples of base films include PET and PBT. Polyamides such as polyester, nylon 6, nylon 66, and inorganic vapor-deposited films, Alternatively, paper can be used. Also, as adhesive synthetic resin films, materials such as PE and PP can be used. Olefins, acrylic synthetic resins, epoxy synthetic resins, etc., can be used. Laminate The film is laminated to the object to be processed by heat and pressure using a laminating machine. It is preferable to apply an anchor coating agent as a pretreatment before the lamination process. It can provide strong adhesion between the film and the object to be treated. For this purpose, isocyanate-based compounds can be used.

[0075] In this specification, heat sealing refers to sealing by heating and pressing, and the base film The adhesive layer is partially coated, or the outermost layer or the bottom layer of the laminate film has a low melting point. This refers to melting the inner layer with heat and then 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 Figure 2(A), the positive electrode current collector 201 and the negative electrode current collector 20 A portion of 4 is positioned to be exposed to the outside from the film 208 and the outer casing 209. When increasing the number of pole layers and stacking them, multiple positive electrode current collectors 201 are electrically welded by ultrasonic welding. The components are connected, and multiple negative electrode current collectors 204 are electrically connected by ultrasonic welding. Oh, in Figure 2(B), a portion of the negative electrode current collector 204 extends outward from the outer casing 209. It is.

[0077] The laminate-type secondary battery thus obtained is placed in a region of the support structure 101 with a large radius of curvature. Attach it from the area with the largest radius of curvature. This can reduce damage to the secondary battery during use.

[0078] Furthermore, Figure 2(A) shows an example of sealing using a single film 208 and an outer casing 209. There are no particular limitations; a single film may be folded in the middle and used as the outer casing. Figure 2(A) Figure 10 shows an example different from Figure 2(B). The film 11 is folded in the middle and the two ends The structure is constructed by overlapping parts and sealing three sides with an adhesive layer. The manufacturing method is described below using Figure 10. explain.

[0079] First, fold the film 11 in half so that it is in the state shown in Figure 10(A). Then, Figure 10(B) As shown, the positive electrode current collector 12, separator 13, and negative electrode current collector 14 that constitute the secondary battery are stacked together. Prepare the layered material. Then, the lead electrode 16 having the sealing layer 15 shown in Figure 10(C) Prepare two of them. The lead electrode 16 is also called a lead terminal and is connected to the positive or negative electrode of the secondary battery. It is provided to pull out to the outside of the protective film. And it has one lead electrode and a positive electrode current collector. The protruding parts of the body 12 are electrically connected by ultrasonic welding or the like. The protruding parts of the positive electrode current collector 12 and The lead electrodes to be connected will be made of aluminum. And the other lead electrode... Then, the protruding portion of the negative electrode current collector 14 is electrically connected by ultrasonic welding or the like. The lead electrodes connected to the protruding part of 4 are made of nickel-plated copper. Then, in order to leave one side open for the electrolyte solution, heat-pressed two sides of the film 11. Then it is sealed. During heat sealing, the sealing layer 15 provided on the lead electrode also melts and seals the lead electrode. It is fixed in place with Room 11. Then, under a reduced pressure atmosphere or an inert atmosphere, the desired amount The electrolyte is dripped onto the inside of the bag-shaped film 11. Finally, without heat sealing, The remaining film is sealed by applying heat pressure to the periphery. Thus, as shown in Figure 10(D) The secondary battery 40 shown can be manufactured. The dotted line and end face area in Figure 10(D) are thermocompression bonded. This is region 17. Also, an example of a cross-section cut along the dashed line AB in Figure 10(D) is shown in Figure 10(E). As shown in Figure 10(E), the positive electrode current collector 12, the positive electrode active material layer 18, and the separator A folded film is formed by laminating 13, a negative electrode active material layer 19, and a negative electrode current collector 14 in that order. It is sandwiched between 11 and further sealed at the ends with an adhesive layer 30, and the remaining space is electrolytic It contains liquid 20.

[0080] Here, we will use Figure 10(F) to explain the current flow during the charging of a secondary battery. Using lithium When a secondary battery is considered as a closed circuit, the movement of lithium ions and the flow of current are in the same direction. In addition, in lithium-ion secondary batteries, the anode and cathode are used during charging and discharging. The cathode is swapped, and the oxidation and reduction reactions are reversed, thus changing the reaction potential. The electrode with a high reaction potential is called the positive electrode, and the electrode with a low reaction potential is called the negative electrode. Therefore, in this specification In this case, whether charging or discharging, or even when applying a reverse pulse current, Even when an electric current is flowing, the positive electrode is called the "positive electrode" or "+ electrode (positive pole)," and the negative electrode is called the "positive pole." This will be called the "negative electrode" or "- electrode (minus electrode)". Related to oxidation and reduction reactions. Using the terms anode and cathode, the difference between charging and discharging is significant. This could be reversed and cause confusion. Therefore, the anode and cathode The term cathode will not be used in this specification. When using terms such as positive electrode () or cathode, specify whether it is during charging or discharging, and the positive electrode ( The corresponding polarity (positive or negative) should also be indicated.

[0081] The charger is connected to the two terminals shown in Figure 10(F), and the secondary battery 40 is charged. As the battery 40 charges, the potential difference between the electrodes increases. In Figure 10(F), secondary battery 4 Current flows from the external terminal of 0 towards the positive electrode current collector 12, and within the secondary battery 40, the positive electrode current is collected. Current flows from body 12 towards the negative electrode current collector 14, and from the negative electrode towards the external terminals of the secondary battery 40. The direction of the current is defined as the positive direction. In other words, the direction in which the charging current flows is defined as the direction of the current. ru.

[0082] Next, prepare a display module to be attached to the secondary battery 103. A display module is... It refers to a display panel with at least an FPC (Flexible Printed Circuit) attached. The display module is It has a display unit 102, an FPC 104, and a drive circuit, and is further powered by a secondary battery 103. It is preferable to provide a converter.

[0083] The display module has a display section 102 that is flexible and has display elements on a flexible film. It has a secondary battery 103 and a display unit 102, and it is preferable to position them so that they partially overlap. Furthermore, by positioning them so that some or all of them overlap, the distance from the secondary battery 103 to the display unit Shortening the power path, i.e., reducing the wiring distance, reduces power consumption.

[0084] A method for fabricating display elements on a flexible film is to use a flexible film Methods for directly fabricating display elements on top of the substrate, or fabricating display elements on a rigid substrate such as a glass substrate. After forming the containing layer, the substrate is removed by etching or polishing, and then the display element is included. Methods for bonding a flexible layer to a rigid substrate such as a glass substrate, A release layer is provided, and a layer including a display element is formed on it, and then the release layer is used to provide rigidity. The substrate and the layer containing the display element are separated, and the layer containing the display element and a flexible film are separated. There are methods such as bonding.

[0085] In this embodiment, the display unit 102 is an active matrix type display capable of high-resolution display. To enable the device to undergo heating treatment at over 400°C, the reliability of the display elements is increased. A manufacturing method that allows for the provision of a release layer on a rigid substrate such as a glass substrate. The technology described in Publication No. 2003-174153 is used.

[0086] According to the technology described in Japanese Patent Publication No. 2003-174153, a transient using polysilicon as the active layer A transistor using an oxide semiconductor layer is mounted on a flexible substrate or film. This makes it possible to do so. Also, by using these transistors as switching elements, A lectroluminescent element (EL element) is provided.

[0087] A typical configuration of an EL element includes a luminescent organic or inorganic compound between a pair of electrodes. It has a layer (hereinafter referred to as the "light-emitting layer") sandwiched between them, and by applying a voltage to the element, Electrons and holes are injected and transported from the pair of electrodes to the light-emitting layer, respectively. The carriers (electrons and holes) recombine, resulting in luminescent organic compounds or anonymity. The compound forms an excited state, and emits light when that excited state returns to the ground state.

[0088] The types of excited states that organic compounds can form include singlet excited states and triplet excited states. This is possible, and the emission from the singlet excited state is called fluorescence, while the emission from the triplet excited state is called phosphorescence. They've found out.

[0089] Such light-emitting elements are usually formed as thin films of a few microns to a few microns in size, A major advantage is that it can be manufactured in a lightweight form. Also, from the time the carrier is injected until light emission occurs... The time it takes to complete the process is at most a microsecond or less, resulting in an extremely fast response time. This is one of its features. Furthermore, sufficient light emission can be obtained with a DC voltage of several volts to several tens of volts. Therefore, it consumes relatively little power.

[0090] EL elements have a superior viewing angle compared to liquid crystal elements, and when the display area has a curved surface, This is preferable as a display element for the display unit 102. Furthermore, unlike liquid crystal elements, it does not require a backlight. Therefore, it consumes less power, reduces the number of parts, and the overall thickness is also reduced. EL elements are also preferable as display elements for the display unit 102 because they can be made thin.

[0091] Furthermore, the method for fabricating a display element on a flexible film is described above (Japanese Patent Publication No. 2003-1 74153) is not limited to this. Furthermore, the method and materials for manufacturing EL elements are known. Since the manufacturing method and known materials can be used, the explanation will be omitted here.

[0092] Furthermore, the display device used in the display unit 102 may be a simple monochromatic light emitter or a display of only numbers. A passive matrix type display device is sufficient, in which case refer to Japanese Patent Publication No. 2003-174153. Display elements can be fabricated on a flexible film using manufacturing methods other than those described. stomach.

[0093] The display module obtained by the above method is attached to the secondary battery 103, and the secondary battery 103 and the display module are displayed together. By electrically connecting the indicator unit 102, the electronic device 100 shown in Figure 1(B) is completed. Furthermore, in order to improve the appearance of the electronic device 100, metal covers and other materials were used for parts other than the display unit 102. Alternatively, you can cover it with a plastic or rubber cover.

[0094] When a display unit is provided in the electronic device 100, the screen size is the size that can be placed on the support structure. In that case, it is not particularly limited. For example, when worn on the wrist, the circumference of an adult's arm around the wrist is 1 Since it is 8cm ± 5cm, the screen size is a maximum of 23cm (wrist circumference) x distance from wrist to elbow It becomes a separation. Also, the distance from the wrist to the elbow of an adult is less than 1 foot (30.48 cm). A 23cm x 30.48cm arm-mounted electronic device can be placed on a cylindrical support structure. This can be considered the maximum screen size of the display unit of 00. Note that the screen size referred to here includes curved surfaces. This refers to the size when the screen is flat, not the size when it is in a posed state. Also, multiple display units These may be provided in a single electronic device, for example, having a second display unit smaller than the first display unit. It may also be an electronic device. The dimensions of the support structure 101 are larger than the screen size of the display unit. To use an EL element, the screen size must be such that it can be placed on the support structure. If available, the total weight of the display panel and FPC alone can be between 1g and less than 10g.

[0095] Furthermore, the thinnest part of the electronic device on which the display unit is provided (the support structure 101 and the display unit 102) The thickness (when the secondary battery 103 is stacked) can be 5 mm or less. Also, electronic devices The thickest part is the connection between the display panel and the FPC, but it should be less than 1 cm. can.

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

[0097] Furthermore, as shown in Figure 1(A), when the electronic device 100 is worn on the arm, arrow 105 The support structure can be worn on the arm by moving in a certain direction. The total weight is less than 100g, preferably 50g or less, and the thickest part is 1cm or less. This allows us to provide lightweight electronic devices.

[0098] Furthermore, as shown in Figure 7(A), the electronic device 100 has curved surfaces with different radii of curvature in cross-section. It has multiple such centers. Figure 7(A) shows the curvature center 700 and the curvature center 701.

[0099] The radius of curvature of a surface will be explained using Figure 9. In Figure 9(A), the curved surface 1700 is cut. In the intersected plane 1701, a portion of the curve 1702 is approximated as an arc of a circle, and the radius of that circle is The radius of curvature is set to 1703, and the center of the circle is set to the center of curvature, 1704. Figure 9(B) shows the curved surface 1700. A top view is shown. Figure 9(C) shows a cross-sectional view obtained by cutting the curved surface 1700 with plane 1701. When a curved surface is cut by a plane, the radius of curvature of the curve will differ depending on the plane used for cutting. When a curved surface is cut by a plane having the smallest radius of curvature, the curvature of the curve Let the radius be the radius of curvature of the surface.

[0100] The inner side is the forearm contact surface of the outer casing (exposed back surface), and the outer side is the film surface of the display panel (exposed surface). When the electronic device 100 having the following characteristics is bent, the side closer to the center of curvature 1800 of the secondary battery The radius of curvature 1802 of the outer casing 1801 (exposed back surface) in contact with the support structure 1805 is, The radius of curvature of film 1803 on the side furthest from the center 1800 is smaller than the radius of curvature 1804 (Figure 8(A)). ). If the electronic device 100 is curved to make the cross-section arc-shaped, the outer casing close to the center of curvature 1800 Compressive stress is applied to the exposed back surface, and tensile stress is applied to the exposed surface of the film that is far from the center of curvature of 1800. Stress is applied (Figure 8(B)). The electronic device 100 has an outer casing 1801 on the side closer to the center of curvature. It can be deformed within a range where the radius of curvature is 10 mm or more, preferably 30 mm or more. .

[0101] Furthermore, the cross-sectional shape of the electronic device 100 is not limited to a simple arc shape, and the part that comes into contact with the wrist may also be a cross-sectional shape. It can be made into a shape with an arc, for example, the shape shown in Figure 8(C). If the curved surface of the secondary battery has a shape with multiple centers of curvature, each of the multiple centers of curvature Among the radii of curvature in this, the curvature of the exterior body 1801 is the smallest radius of curvature of the curved surface. The radius of curvature of the surface closer to the center is within a range of 10 mm or more, preferably 30 mm or more. The sub-device 100 can be deformed.

[0102] Figure 7(B) 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 Figure 7(C).

[0103] (Embodiment 2) This embodiment demonstrates an example of charging a secondary battery using an antenna. .

[0104] For safety reasons, the input and output terminals for charging or discharging the secondary battery are exposed because it will come into contact with a part of the human body. It is preferable not to allow this to happen. If the input / output terminals are exposed, water such as rain can damage the input / output terminals. There is a risk of short circuits, and a risk of electric shock if the input / output terminals come into contact with the human body. Using an antenna Then, the input / output terminal can be configured not to be exposed on the surface of the electronic device.

[0105] Note that, except for providing the antenna and the RF power feeding converter, it is the same as in the first embodiment. Therefore, other detailed descriptions will be omitted here.

[0106] According to the first embodiment, a flexible secondary battery is fixed on the support structure, and the display module is attached on the secondary battery. An RF power feeding converter and an antenna electrically connected to the secondary battery are provided. Also, the RF power feeding converter is fixed so as to overlap a part of the display unit.

[0107] The RF power feeding converter and the antenna are 10 g or less, and the total weight can be made almost the same as that in the first embodiment.

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

[0109] Also, information such as the remaining amount of charge and the remaining time until full charge can be displayed on the display unit of the electronic device 300.

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

[0111] (Embodiment 3) In this embodiment, an example of a configuration for improving wrinkles that may occur when the secondary battery is curved and the risk of electrolyte leakage is shown in FIG. 4.

[0112] ​​​​In Embodiment 1, a laminate film is used to seal a secondary battery, and the periphery is fixed at one location (at one location in the cross-section). Therefore, if the seal fails at even one location when the secondary battery is repeatedly bent or subjected to an impact, the electrolyte inside will leak out. When the secondary battery is repeatedly bent or subjected to an impact and is fixed at one location, the bending stress will concentrate at that one location, resulting in the inability to maintain the seal. Therefore, in this embodiment, as shown in Fig. 4(A), two films are fixed at two locations. Fig. 4 shows a schematic cross-sectional view of a secondary battery 400 in which a positive electrode and a negative electrode are sealed with two films.

[0113] By fixing at two locations, the bending stress is alleviated, and the seal can be maintained. Fig. 4 shows a schematic cross-sectional view of a secondary battery 400 in which a positive electrode and a negative electrode are sealed with two films. By fixing at two locations, the bending stress is alleviated, and the seal can be maintained.

[0114] In addition, a configuration example different from Embodiment 1 is shown in Fig. 4(B).

[0115] In Fig. 4(B), an example is shown where a display portion 402 is provided on the front surface side of a support structure 401, and a secondary battery 4 00 is arranged on the back surface side.

[0116] In addition, in Fig. 4(B), an opening is provided in the support structure 401, and an FPC 403 extending from the display portion 402 and an FPC 404 extending from the secondary battery are electrically connected through the opening.

[0117] In this embodiment, the size of the opening provided in the support structure 401 is not particularly limited. As long as a certain degree of mechanical strength can be ensured, it may have an area larger than the display portion 402, and the display portion may be fitted into the cut-out opening. In this case, the secondary battery 400 and the display portion 402 can also be provided in contact with each other. The larger the opening, the lighter the weight of the support structure. portion 402 can also be provided in contact with each other. The larger the opening, the lighter the weight of the support structure. portion 402 can also be provided in contact with each other. The larger the opening, the lighter the weight of the support structure. Because the weight of one component can be reduced, the overall weight can be made lighter.

[0118] This embodiment can be freely combined with Embodiment 1. [Examples]

[0119] A device manufactured according to Embodiment 1, with an image displayed on the display unit, is shown when worn on the arm. A photograph of the vessel is shown in Figure 5.

[0120] The dimensions of the electronic device shown in Figure 5 are 60 mm wide, 77 mm long, and 57 mm deep, and support The dimensions are determined by the stainless steel structure. The outer dimensions of the display panel are 51.5mm x 9 The thickness is 2.15 mm, and the display area is 42.12 mm x 74.88 mm. The weight is between 40g and 50g, with the total weight of the display panel and FPC alone being approximately 2g. This is possible. In this specification, FPC refers to a flexible printed circuit board. Yes, there are multiple metal foils (Cu, Ni, It is formed by creating patterns (such as Au). The ends of multiple arranged metal foil patterns are positioned horizontally. A crimped anisotropic conductive film (ACF) is formed along the edge of the tip of the FPC as if it were being cut. The external connection terminals provided on the display panel and the FPC are connected using the ACF formed on the FPC. They are electrically connected by crimping.

[0121] Furthermore, a laminate-type secondary battery is used as the rechargeable battery, and lithium iron phosphate is used as the positive electrode active material. It uses lithium iron phosphate (LiFePO4). Lithium iron phosphate is used in highly safe secondary batteries. It is possible.

[0122] Also, a schematic cross-sectional view of the secondary battery used in FIG. 6 is shown. This secondary battery includes a sheet-like positive electrode current collector 601 and a sheet-like positive electrode active material layer 602, a separator 607, a negative electrode current collector 604 and a negative electrode active material layer 605 are laminated, and other regions are filled with an electrolytic solution 610, and these are housed in a film 608 and an exterior body 609 made of a film having a concave portion.

[0123] As shown in FIG. 6, the number of electrode layers is 16. FIG. 6 shows a structure of a total of 16 layers, with 8 layers of the negative electrode current collector 604 and 8 layers of the positive electrode current collector 601. Note that since FIG. 6 shows a cross-section of the extraction portion of the negative electrode, 8 layers of the negative electrode current collector 604 are ultrasonically joined.

[0124] Also, the thinnest portion (the thickness where the support structure, the display portion, and the secondary battery overlap) of the electronic device provided with the display portion is 3.2 mm. Also, the thickest portion of the electronic device is the connection portion between the display panel and the FPC (the region where the external connection terminal is provided), and is 6 mm. Note that an IC chip, passive electronic components, etc. may be directly fixed and provided on the FPC. However, in this case, the IC chip, etc. shall not be regarded as a part of the FPC. When any passive electronic components such as L, C, and R components, a driving circuit IC chip, a CPU, a memory, etc. are directly fixed and provided on the FPC, that portion may become the thickest portion of the electronic device.

[0125] Also, in this embodiment, an example in which lithium iron phosphate is used as the positive electrode active material is shown. However, by appropriately changing the configuration of the secondary battery such that the volumetric energy density becomes high, for example, the material of the positive electrode active material and the material of the negative electrode active material further miniaturization and weight reduction can be achieved. For example, if lithium cobalt oxide (LiCoO2) is used as the positive electrode active material, the volumetric energy density is high ​ Therefore, if a secondary battery with the same capacity as in this embodiment is manufactured, the thickness will be further reduced and the weight will be reduced. It can be made lighter.

[0126] The power for the video display shown in Figure 5 is supplied solely from the secondary battery located on top of the display unit. .

[0127] Of course, the image displayed in Figure 5 is not a manipulated image, but is actually a full-color display. It is present. The resolution of the display unit in Figure 5 is 326 ppi, and there are three traces in one pixel. A transistor is provided, and these transistors are made of oxide semiconductor (InGaO3(ZnO) m )of It is used. Connection terminals for charging and display video signal input are provided at the end of the support structure. When the user is not using the device, i.e., when charging or when displaying video signals, external charging is required. It connects to a device or external drive unit. Also, when the user is using it, i.e., when it is worn on the arm. Furthermore, while the display is active, the wiring and other cords are not connected to the external drive device.

[0128] The electronic device shown in Figure 5 has a total weight of 50g or less, is lightweight when worn on the arm, and has a stylish appearance. It has excellent design and can be used as an accessory (personal ornament). [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 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 610 Electrolyte

Claims

1. An electronic device having a curved structure, a flexible secondary battery, and a flexible display unit, The structure comprises 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 smaller than the second radius of curvature. The first part is connected to the second part, The second part is connected to the third part, Each of the first and third parts can bend more than the second part. The secondary battery is arranged such that the second portion has an area that overlaps with the display unit. An electronic device having the function of charging power from the charger when the electronic device is positioned so as to overlap with the charger.

2. An electronic device having a curved structure, a lithium-ion secondary battery, and a flexible display unit, The structure comprises 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 smaller than the second radius of curvature. The first part is connected to the second part, The second part is connected to the third part, Each of the first and third parts can bend more than the second part. The lithium-ion secondary battery is arranged such that the second portion has an area that overlaps with the display unit. When the electronic device is positioned so as to overlap with the charger, the lithium-ion secondary battery has the function of charging power from the charger.

Images