JP2002366059A - Portable information terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable information terminal which is thin in thickness, high in reliable against external force in portable use and high in visibility even at a dim place. SOLUTION: The portable information terminal which is very thin in thickness, and high in visibility even at the dim place is constituted by providing it with at least an organic EL display, a plurality of IC chips, an antenna coil for communication, an inputting key switch, a sheet battery, etc. A transparent substrate being a base material forming the organic EL display is mainly made of polymer and the IC chip is made thin in thickness to obtain the portable information terminal which is not broken easily due to external force such as curving in portable use. The transparent substrate, a supporting substrate being the core of the terminal information terminal or a multilayer wiring board are constituted of waterproof material to seal the organic EL display with them. Thus, the display is prevented from being deteriorated due to moisture absorption to enhance its reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for realizing a portable information terminal using an organic EL display as a display device and realizing high reliability and portability.

[0002]

2. Description of the Related Art Generally, an IC card has an IC chip, such as a CPU or a memory, embedded in a thin card, has a much larger storage capacity than a conventional magnetic card, and has an arithmetic operation inside the card. For example, prepaid cards such as telephone cards, credit cards, cash cards, and the like are being replaced with IC cards because processing can be performed. Attempts have also been made to use it as a commuter pass for trains and other forms of transportation, or as an ID card such as an employee ID card or a driver's license. It seems that the flow will be to centrally manage with cards.

As described above, when various information is centrally managed in one card, the owner often wants to confirm the contents of the information managed in the card. Therefore, it is very convenient to incorporate a display capable of displaying information in the card. As a display for a portable information device, a liquid crystal display formed on a glass substrate is generally used. However, there is a problem that the display is easily broken by an external force such as bending or impact when carrying. Therefore, a structure of an IC card using a flexible liquid crystal display using a plastic substrate instead of glass is described in, for example, Japanese Patent Application Laid-Open No. 9-311921.

[0004]

However, in the above-described liquid crystal display, since it does not emit light by itself, there is a problem in that it is easy to see in a bright place by using reflected light, but poor in visibility in a dim place. The use of a backlight makes it easier to see, but the portable information terminal becomes thicker and consumes more power, which reduces portability.

As a self-luminous display having high visibility, there is an organic EL display. This has a laminated structure in which an organic light emitting layer is sandwiched between a transparent electrode and a negative electrode, and emits light by selectively injecting charges into the light emitting layer to obtain a display. Since it is self-luminous, there is no problem in visibility even without a backlight, so that it is thin and has low power consumption. By using the organic EL display, an IC card with high visibility even in a thin and dim place can be realized.

In addition to the IC card, an organic EL display, a plurality of IC chips such as a microcomputer, a memory, and a display driver, an antenna serving as communication means, an operation switch, and a rechargeable secondary battery are provided. , A portable information terminal that displays various information on the organic EL display can be configured. For example, it is possible to receive and display broadcast radio waves such as teletext or television via an antenna, or to display a web page on the Internet. Also, for example, another information device such as a mobile phone generates image data by communication or reading from a storage medium, and receives and displays image data transmitted from the device, and is used as an external display device. Is also conceivable.

Although the organic EL display has the above-mentioned advantages, it also has a problem that the organic EL display is liable to be deteriorated due to moisture absorption. It is an object of the present invention to efficiently mount an organic EL display and the above-described components and realize a thin and highly reliable portable information terminal.

[0008]

The portable information terminal which achieves the above object is constituted as follows.

An organic EL display having at least a laminated structure of a transparent electrode, an organic light emitting layer and a cathode, and a plurality of I
A flexible transparent substrate having at least a C chip, a thin sheet-shaped battery, an antenna mechanism for communication, and an input switch, and having the organic EL display formed on one surface of a sheet-shaped support substrate, The sheet-shaped battery is adhered to the other surface of the support substrate, and the IC chip is electrically and mechanically connected to a TAB tape having a wiring pattern therein. Then, a part of the wiring pattern of the TAB tape is connected to the transparent electrode of the organic EL display, and another part of the wiring pattern is connected to an electrode of the film-type battery, and the periphery is made of resin. A portable information terminal is obtained by sealing. The transparent substrate and the support substrate are each made of a material having high waterproofness to prevent moisture from the outside from reaching the organic EL display, thereby preventing deterioration of the organic EL display and improving reliability. A high portable information terminal can be obtained.

[0010] Specifically, it is desirable to use a metal material for the core of the supporting substrate. Since the metal material prevents the permeation of moisture and the supporting substrate serves as a base material for bonding each member, it must have some rigidity in terms of ease of assembly, and use a metal material with relatively high rigidity. Thereby, rigidity can be maintained even if the thickness is reduced.

The transparent substrate is made of a polymer material in order to have a structure resistant to bending and impact. However, in order to enhance the waterproof property, it is desirable to coat a layer made of an inorganic material such as a metal oxide or to have the inside of the layer.

The TAB tape is folded on the side surface of the support substrate to connect the organic EL display bonded to the front and back of the support substrate and the sheet-shaped battery. In order to make the IC chip hard to be broken by an external force such as bending, it is desirable to mount the IC chip by polishing or chemically etching the back surface.

As the antenna mechanism, a part of the wiring pattern of the TAB tape can be formed in a coil shape to provide an antenna function. As an input switch, for example, a push-type key switch can be electrically and mechanically bonded to the TAB tape. Since the key switch is generally much thicker than the organic EL display, it is preferable to connect the key switch to the sheet-like battery bonding side of the support substrate in order to reduce the thickness of the entire portable information terminal. However, when it is desired to provide an input switch on the organic EL display side, for example, the following configuration can be adopted. A cavity is formed between the support substrate and the TAB tape by forming a depression on the organic EL display bonding surface side of the support substrate, a conductive film is formed on the bottom surface of the depression of the support substrate, and a pair of electrodes are formed on the surface of the opposite TAB tape. To form
By pushing in from above the depression, the conductive film of the support substrate and the pair of electrodes of the TAB tape are brought into contact with each other, and a key switch that performs switching by conducting between the pair of electrodes can be obtained. TAB between transparent substrate and supporting substrate
When it is desired to dispose an input switch in a region where no tape is interposed, a similar configuration can be obtained by forming two electrodes on a transparent substrate instead of a TAB tape. In that case, a part of the wiring drawn from the pair of electrodes is connected to a part of the wiring pattern of the TAB tape.

The sheet battery is preferably as thin as possible in order to make the portable information terminal of the present invention thinner. Preferably, the battery is formed into a thin sheet by using a battery having a polymer electrolyte such as a lithium polymer battery. I do.
Further, the supporting substrate may be used as a part of a member for sealing the electrolyte. For charging a sheet-shaped battery, for example, a charging electrode is formed on a TAB tape or a support substrate,
The battery can be exposed from the sealing resin and charged externally through the main electrode. There is also a method in which a coil is formed by thin-film wiring on a TAB tape or a support substrate, and charging is performed using an induced electromotive force from an external coil.

The wiring pattern formed inside the TAB tape is usually a single layer. When wiring is not possible with a single layer, it is possible to form wiring on the surface of the transparent substrate or supporting substrate and connect it to the wiring to partially form a two-layer wiring, but if the wiring pattern becomes complicated, A multilayer wiring board is required. In that case, a portable information terminal can be configured as follows.

An organic EL display having at least a laminated structure of a transparent electrode, an organic light emitting layer and a cathode;
A flexible structure in which the organic EL display is formed on one surface of a multilayer wiring board having at least a C chip, a thin sheet battery, a communication antenna mechanism, and an input switch, and having a multilayer wiring pattern therein. A transparent substrate is bonded from the organic EL display forming surface side, and the transparent electrode is connected to a part of the wiring pattern of the multilayer wiring substrate, and the other surface side of the multilayer wiring substrate is The portable information terminal is obtained by electrically and mechanically connecting the IC chip and the sheet battery and sealing the periphery with a resin. The constituent material of the transparent substrate and the multilayer wiring board each include a material having high waterproof property, and the organic EL
By making it difficult for moisture from the outside to reach the display, a highly reliable portable information terminal can be realized.

In this configuration, a multilayer wiring board having a multilayer wiring layer formed on the surface is used as the support substrate. However, in this multilayer wiring board, the core is made of a metal material.
This is preferable in terms of imparting rigidity while preventing permeation of moisture. The transparent electrode of the organic EL display is connected to a wiring pattern on one surface of the multilayer wiring substrate, and can be connected to a wiring pattern on the other surface to which an IC chip or a sheet-shaped battery is connected via through holes. From the viewpoint of waterproofing the organic EL display, this through hole is
It is not arranged immediately below the display forming area.

Regarding the details of each of the other parts, the same effect can be obtained with the same configuration as the above-described configuration using the TAB tape.

With the above configuration, a portable information terminal having a built-in organic EL display with high visibility and low power consumption can be prevented from being deteriorated due to moisture absorption of the organic EL display.
In addition, from the viewpoint of being strong against external forces such as bending when carrying, it can be realized as a highly reliable configuration.

[0020]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view of a first embodiment showing an example of a typical configuration of a portable information terminal according to the present invention. In the first embodiment, an organic EL display 4 having a laminated structure of a transparent electrode 1, an organic light emitting layer 2 and a cathode 3, and a first IC
Chip 5, second IC chip 6, thin sheet-shaped battery 7, antenna coil 8 for communication, key switch 9 for input, flexible transparent substrate 10, and sheet-shaped support substrate 11 having a wiring pattern 12 therein
It has a B tape 13. The organic EL display 4 is formed on a transparent substrate 10, and the transparent substrate 10 is
On the first surface 11a, an adhesive 14 is disposed so as to seal the area where the organic EL display is formed, and is adhered. The sheet-shaped battery 7 is adhered to the second surface 11b which is the other surface of the support substrate 11, and the TAB tape 1
The first IC chip 5 and the second IC chip 6 are bonded to 3 so as to be electrically connected to the wiring pattern 12.
Further, a part of the wiring pattern 12 of the TAB tape 13 is connected to the transparent electrode 3 and the cathode 4 of the organic EL display 4, and another part of the wiring pattern 12 is connected to the electrode 15 of the sheet battery 7. Is sealed with the sealing resin 16 to obtain the portable information terminal 100.

The problem of the organic light emitting layer 2 constituting the organic EL display is that it deteriorates due to moisture absorption and the light emitting performance tends to deteriorate. By having a high material, the organic EL display is sealed with a highly waterproof member, and can be hardly deteriorated.

More specifically, the supporting substrate 11 is preferably made of a metal material for the core portion to prevent the permeation of moisture, and may be formed with an insulating film on the surface. In addition, since the supporting substrate is a base material for bonding each member, some rigidity is required in terms of ease of assembly. Can be kept.

The transparent substrate 9 serves as a base material for forming the organic EL display 4 and is usually made of glass, but is mainly made of a polymer material in order to have a structure resistant to bending and impact. I do. However, in order to enhance the waterproofness, it is desirable to coat a layer made of an inorganic material such as a metal oxide or a nitride or to have the inside of the layer.

Since the TAB tape 13 needs to be connected to both the organic EL display 4 and the sheet battery 7 adhered to the front and back of the support substrate 11, the TAB tape 13 is folded on the side surface of the support substrate 11.

Although only two IC chips, a first IC chip 5 and a second IC chip 6, are shown in FIG.
There may be three or more. These IC chips include, for example, a microcomputer that performs arithmetic processing, memories that store data,
It has a function such as a display driver for driving a display, or may be an ASIC in which a plurality of functions are built in one chip. From the viewpoint of making these IC chips hard to be broken by an external force such as bending, it is desirable to thin the back surface by polishing or chemically etching the back surface. TAB of IC chip
For connection to the tape 13, for example, a bump made of, for example, solder or gold is formed as an external electrode 17 on an IC chip, and the external electrode 17 is connected to the wiring pattern 12 of the TAB tape 13 via the external power 17. A method of injecting the underfill 18 into the periphery is adopted. Further, the connection may be performed by using an anisotropic conductive sheet or the like, and in any case, a connection form in which the electrical bonding portion is hard to be broken by deformation such as bending. The mounting portion of the IC chip may be on either side of the support substrate 11, but if it is considerably thicker than the organic EL display 4, from the viewpoint of reducing the overall thickness of the portable information terminal 100, Surface 11 of 2
It is desirable to arrange on the b side.

By forming a part of the wiring pattern 12 of the TAB tape 13 into a coil shape to form the antenna coil 8,
An antenna function can be provided. As the input switch, for example, a push-type key switch 9 can be bonded to the TAB tape 13 so as to be electrically connected to the wiring pattern 12. In this case, from the viewpoint of reducing the overall thickness, the support substrate 11 is preferably disposed on the second surface 11b side. However, when it is desired to provide an input switch on the first surface 11a side, for example, the cross section in FIG. The structure shown in the schematic diagram can be adopted. By forming the depression 21 on the first surface 11a side of the support substrate 11, a gap is formed between the support substrate 11 and the TAB tape 13, and the conductive film 22 is formed on the bottom surface of the depression 21 and the surface of the opposing TAB tape is formed. By exposing the pair of electrodes 23 and pressing them in from the depression, the conductive film 22 and the pair of electrodes 23 on the TAB tape come into contact with each other, and a key switch that performs switching by conducting between the two electrodes. 24. When it is desired to arrange an input switch in a region where the TAB tape 12 is not interposed between the transparent substrate 9 and the support substrate 11, a similar configuration is formed by forming a pair of electrodes 23 on the transparent substrate 9 instead of the TAB tape 12. Is obtained. In this case, a part of the wiring drawn from the pair of electrodes 23 is replaced with T
It is connected to a part of the wiring pattern 12 of the AB tape 13.

The sheet battery 7 is preferably as thin as possible in order to make the portable information terminal 100 thinner. For example, when a battery having a polymer electrolyte such as a lithium polymer battery is used, the battery 7 can be formed in a thin sheet shape. Easy and desirable. The support substrate 11 may be used as a part of a member for sealing the electrolyte of the sheet battery 7. To charge the sheet-shaped battery 7, for example, a charging electrode is formed on the TAB tape 13 or on the support substrate 11, and the sealing resin 1 is charged.
6 and can be charged from the outside through the main charging electrode. Also, on the TAB tape 13,
Alternatively, a method may be used in which a coil is formed on the support substrate 11 by thin film wiring, and charging is performed using an induced electromotive force from an external coil.

The wiring pattern formed inside the TAB tape 13 is usually a single layer, and if wiring is impossible with a single layer, wiring is formed on the surface of the transparent substrate 9 or the support substrate 11 and the wiring is Wiring pattern 1 of tape 13
2 can be partially connected to form a two-layer wiring. However, when the wiring pattern becomes complicated, a multilayer wiring board is required, and in such a case, a configuration like the second embodiment of the present invention shown in FIG. 3 can be adopted.

In the second embodiment, an organic EL display 34 having a laminated structure of a transparent electrode 31, an organic light emitting layer 32, and a cathode 33, a first IC chip 35, and a second IC
It includes a chip 36, a thin sheet-shaped battery 37, a communication antenna coil 38, an input key switch 39, a flexible transparent substrate 40, and a multilayer wiring substrate 41. The organic EL display 34 is formed on a transparent substrate 40, and the transparent substrate 40 is formed on the first surface 4 of the multilayer wiring board 11.
An adhesive 42 is disposed around and adheres to the area 1a so as to seal the organic EL display formation area, and the transparent electrode 31 and the cathode 33 of the organic EL display 34 are connected to one of the wiring patterns 43a in the multilayer wiring board 41. Electrically connected to the unit. The sheet-shaped battery 37 is adhered to the second surface 41b which is the other surface of the multilayer wiring board 41, and the electrodes 44 of the sheet-shaped battery 37 are electrically connected to a part of the wiring pattern 43b of the multilayer wiring board 41. Connecting. Furthermore, the first IC
The chip 5 and the second IC chip 6 also have the wiring pattern 43.
b so as to be electrically connected to b. The periphery is sealed with the sealing resin 45 to obtain the portable information terminal 200.

Also in the second embodiment, the transparent substrate 39
In addition, since each of the constituent materials of the multilayer wiring board 41 includes a material having a high waterproof property, the organic EL display 34 is sealed by a member having a high waterproof property, and can be hardly deteriorated.

The specific structure of the transparent substrate 39 is the same as in the first embodiment. Also in the multilayer wiring board 41, preferably, by using a metal material for the core layer 41c, the permeation of moisture can be prevented, and the rigidity can be maintained even if the thickness is reduced. The wiring pattern 43a formed on the first surface 41a side of the multilayer wiring board 41 and the wiring pattern 43b formed on the second surface 41b side are electrically connected by the through holes 46 formed inside the multilayer wiring board 41. Connected to. From the viewpoint of waterproofing the organic EL display 34, it is desirable that the through-hole 46 is not disposed immediately below the region where the organic EL display 34 is formed. Antenna coil 38
Are the wiring patterns 43a or 43 of the multilayer wiring board 41.
By forming a part of b in a coil shape, it can function as a communication antenna. IC chip 3
5, 36 and the key switch 39 are electrically and mechanically connected on the multilayer wiring board 41 in the same manner as described in the first embodiment. The structure of the film-type battery 37 is the same as that of the first embodiment.

With the configuration described above, a portable information terminal incorporating an organic EL display with high visibility can be made thin, excellent in portability, prevented from being deteriorated by moisture absorption of the organic EL display, and bendable when being carried. Since it is strong against external force, it can be realized as a configuration having high reliability.

The portable information terminal of the present invention is configured in an IC card size as shown in FIG. 4, for example, electronic money information such as a credit card, a prepaid card, a commuter pass for transportation, an employee ID card and a license. It is possible to configure a complex IC card that centrally manages a plurality of information such as personal authentication information such as certificates. For example, taking the prepaid card function as an example and using the first embodiment, the balance information is stored in an IC chip having a memory function, and the data is transmitted through the antenna coil 8 every time the user pays. The data is read and written, and arithmetic processing is performed in an IC chip having an arithmetic function such as a microcomputer according to the payment amount, and the balance information in the memory is rewritten. The user operates the key switch 9 to display the balance information on the organic EL display 4 so that the user can check the balance at any time. The entire card is powered by a sheet battery 7
Supplied by

Further, the portable information terminal of the present invention is not limited to the use as an IC card as described above, and receives a broadcast radio wave such as a text broadcast or a television via the antenna coil 8. Characters and images can be displayed on the organic EL display 4, or an Internet web page can be displayed. A structure for transmitting audio data to an external audio output device such as a headphone or an earphone by wireless or wired transmission and listening to audio may be further provided. Also,
For example, another information device, such as a mobile phone, generates image data through communication or reading from a storage medium, and receives and displays image data transmitted from the device. Can be When used as such a portable information terminal, the size of the portable information terminal of the present invention is not limited to the size of an IC card, but is a notebook size enough to fit in a pocket, or as shown in FIG. It is also possible to make the shape like an underlay of about B5 or A4 size. Also in this case, by adopting the configuration described in the present invention, a very thin and highly reliable portable information terminal can be realized.

[0036]

The effects obtained by typical aspects of the invention disclosed in the present application will be briefly described as follows.

According to the present invention, an organic EL display,
By using a portable information terminal having a plurality of IC chips, a communication antenna coil, an input key switch, a sheet battery, and the like, a portable information terminal which is extremely thin and has high visibility even in a dark place is formed. By making the transparent substrate, which is the base material of the organic EL display, the main component of the polymer and thinning the IC chip,
A portable information terminal that is not easily destroyed by external force such as bending when carrying can be obtained. In addition, the transparent substrate and the supporting substrate or the multilayer wiring substrate serving as the core of the portable information terminal have a high waterproof material as a constituent material.
By sealing the L display, deterioration of the organic EL display due to moisture absorption can be prevented, and a highly reliable portable information terminal with a display can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a portable information terminal according to the present invention.

FIG. 2 is a schematic cross-sectional view illustrating an example of a configuration method of a key switch for input.

FIG. 3 is a schematic sectional view showing a second embodiment of the portable information terminal according to the present invention.

FIG. 4 is a schematic view showing an example of the appearance of the portable information terminal of the present invention.

FIG. 5 is a schematic view showing an example of the appearance of the portable information terminal of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transparent electrode, 2 ... Light emitting layer, 3 ... Cathode, 4 ... Organic EL display, 5 ... First IC chip, 6 ... Second IC chip, 7 ... Sheet-shaped battery, 8 ... Antenna coil, 9 ... Key Switch, 10: transparent substrate, 11: support substrate, 11a
... a first surface of the support substrate, 11b ... a second surface of the support substrate,
12: wiring pattern, 13: TAB tape, 14: adhesive, 15: electrode of sheet battery, 16: sealing resin, 17
... External electrodes of IC chip, 18 ... Underfill, 21
... recesses in the support substrate, 22 ... conductive films, 23 ... pairs of electrodes,
24 key switch, 31 transparent electrode, 32 light emitting layer,
33: cathode, 34: organic EL display, 35: first
IC chip, 36: second IC chip, 37: sheet battery, 38: antenna coil, 39: key switch,
40: transparent substrate, 41: multilayer wiring substrate, 41a: first surface of multilayer wiring substrate, 41b: second surface of multilayer wiring substrate,
41c: core layer of multilayer wiring board, 42: adhesive, 43a
... Wiring pattern on first surface, 43b. Wiring pattern on second surface, 44. Electrode of sheet battery, 45.
46 ... through hole, 100 ... portable information terminal, 200 ...
Personal digital assistant.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H05B 33/02 H04B 1/38 5K023 33/14 G06K 19/00 N // H04B 1/38 HK F Term (Reference) 3K007 AB05 AB13 BA07 BB05 CA05 CB01 DA00 DB03 EB00 FA01 FA02 5B035 AA04 AA06 BA05 BB09 CA06 CA23 5C094 AA01 AA15 AA38 BA03 BA29 CA19 EA04 EA05 EA07 HA08 5G435 AA07 AA14 BB05 EE10 A03 A03 A03 A03 A03 A03 A01

Claims (14)

[Claims] 1. An organic EL display having a laminated structure of at least a transparent electrode, an organic light emitting layer, and a cathode, a plurality of IC chips, a thin sheet battery, a communication antenna mechanism, and an input switch. At least a flexible transparent substrate having the organic EL display formed on one surface of a sheet-shaped support substrate is adhered from the organic EL display forming surface side, and the sheet-shaped support substrate is bonded to the other surface of the support substrate. A battery is adhered, and the IC chip is electrically and mechanically connected to a TAB tape having a wiring pattern therein, and a part of the wiring pattern of the TAB tape is partially connected to the transparent electrode of the organic EL display and the TAB tape. By connecting to a cathode, another part of the wiring pattern is connected to the electrode of the sheet-shaped battery, and the periphery is sealed with a resin. In the obtained portable information terminal, the transparent substrate and the supporting substrate each have a highly waterproof material as a constituent material, and moisture is hardly allowed to reach the organic EL display from the outside. . 2. The portable information terminal according to claim 1, wherein a metal material is used for a core portion of the support substrate. 3. The portable information terminal according to claim 1, wherein the transparent substrate has a laminated structure of at least a polymer layer and a waterproof inorganic layer. 4. The portable information terminal according to claim 1, wherein a part of the wiring pattern of the TAB tape functions as the antenna mechanism. 5. The portable information terminal according to claim 1, wherein a key switch is electrically and mechanically connected as an input switch on the TAB tape. 6. A cavity is formed between the support substrate and the TAB tape by forming a depression on the surface of the support substrate to which the organic EL display is adhered, and the depression is formed by pushing on the depression. The conductive film formed on the bottom surface of the contact with the pair of electrodes formed on the TAB tape side contacts,
The portable information terminal according to claim 1, further comprising a key switch that performs switching by conducting between the pair of electrodes. 7. The portable information terminal according to claim 1, wherein the supporting substrate is used as a part of a member for sealing an electrolyte of the sheet-shaped battery. 8. An organic EL display having a laminated structure of at least a transparent electrode, an organic light emitting layer, and a cathode, a plurality of IC chips, a thin sheet-shaped battery, a communication antenna mechanism, and an input switch. A flexible transparent substrate on which the organic EL display is formed is adhered to the first surface, which is at least one side of the multilayer wiring substrate having a multilayer wiring pattern therein, from the organic EL display forming surface side. And connecting the transparent electrode and the cathode to a part of a first wiring pattern formed on a first surface of the multilayer wiring substrate, and forming the transparent electrode and the cathode on a second surface which is the other surface of the multilayer wiring substrate. A portable information terminal obtained by connecting the IC chip and the electrode of the sheet-shaped battery to a part of the second wiring pattern, and sealing the periphery with a resin; Each of the constituent materials of the multilayer wiring board has a highly waterproof material, and moisture from the outside hardly reaches the organic EL display. 9. The portable information terminal according to claim 7, wherein a metal material is used for a core layer of the multilayer wiring board. 10. The portable information terminal according to claim 8, wherein the transparent substrate has a laminated structure of at least a polymer layer and a waterproof inorganic layer. 11. The communication method according to claim 8, wherein a part of the first wiring pattern or the second wiring pattern of the multilayer wiring board functions as an antenna coil for communication.
The portable information terminal according to any one of items 1 to 10. 12. The portable information terminal according to claim 8, wherein a key switch is electrically and mechanically connected as an input switch on the multilayer wiring board. 13. A cavity is formed between a support substrate and a TAB tape by forming a depression on the first surface of the multilayer wiring board, and is formed on a bottom surface of the depression by pressing on the depression. The portable information according to any one of claims 8 to 11, further comprising a key switch that performs switching by bringing the conductive film into contact with two electrodes formed on the TAB tape side and conducting between the two electrodes. Terminal. 14. A first wiring pattern and a second wiring pattern of the multilayer wiring board are electrically connected to each other through through holes formed inside the multilayer wiring board, and the negative hole is 14. The portable information terminal according to claim 8, wherein the portable information terminal is not disposed immediately below the organic EL display forming region of the multilayer wiring board.