JP2002217515A - Plastic film lcd electrically connecting structure and connecting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically connecting structure of a board and a plastic film LCD having superior yield, since the LCD can be connected with the printed board without thermo-compressive bonding an FPC, and exchange of the LCD is enabled easily, and to provide a connecting method therefor. SOLUTION: In this plastic film LCD electrically connecting structure, the printed board 5 is provided with the FPC 3 for electrical connection and accommodated in a first cabinet 1. The plastic film LCD 4 is provided with an electrode pattern 4a for electrical connection. A pressing member 10 for forcibly bringing the FPC 3 and the electrode pattern 4a into contact with each other, and a holding part which is arranged for detachably holding the pressing member on a second cabinet, are disposed. When the first and the second cabinets are assembled, the pressing member 10 presses the FPC 3 or the vicinity thereof, and the FPC 3 and the electrode pattern 4a are connected electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular phone, a PDA, and the like.
(Personal digital assistant
The present invention relates to a connection structure and a connection method for electrically connecting a plastic film liquid crystal display (LCD) used in small electronic devices such as a digital still camera and a substrate accommodated in these small electronic devices. is there.

[0002]

2. Description of the Related Art Conventionally, liquid crystal display devices (LCD)
The following method is known for connecting the substrate to a printed wiring board.

The first is a flexible wiring board or a flexible flat cable (hereinafter, collectively referred to as an FPC).
Is connected to LCD by thermocompression bonding etc. (ACF connection)
In this method, the other end of the FPC is connected to an FPC connector soldered to a printed circuit board in advance.

[0004] The second is to use an elastomer connector and to use an LC
This is a method of connecting by pressing D with a metal fitting for fixing.

[0005] Third, a connector for an LCD electrical connection provided with conductive contacts proposed by the present inventors (Japanese Patent Application No. 11-221405 and Japanese Patent Application No. 11-27).
No. 8390).

[0006]

However, the first method described above has a problem in that the cost is high due to poor yield at the time of FPC thermocompression bonding.

In the above-described second method, there is a problem that a short circuit easily occurs between substrate patterns, and that an elastomer connector has poor durability against a dimensional change due to a temperature change or the like.

Furthermore, in the third method, when pressure is concentrated on one point of the electrode pattern in connection with a relatively soft LCD such as a plastic film LCD, the electrode pattern may be damaged due to distortion of the plastic film LCD. Problem.

Therefore, a first technical problem of the present invention is that F
Since the LCD and the printed circuit board can be connected without thermocompression bonding of the PC, the yield and the LCD can be easily exchanged. To provide.

[0010] A second technical problem of the present invention is to provide an electrical connection structure between a substrate and a plastic film LCD capable of absorbing a dimensional change due to a temperature change or the like and obtaining a stable connection, a connection method, and the like. Is to provide.

A third technical object of the present invention is to provide an electric connection structure between a substrate and a plastic film LCD, which is capable of preventing pressure from being concentrated on one point of an electrode pattern of the plastic film LCD and preventing the pattern from being damaged. And a connection method.

A fourth technical object of the present invention is to provide an electrical connection structure and a connection method between a substrate and a plastic film LCD, which can provide a stable connection with a large contact area.

[0013]

According to the present invention, a substrate on which electronic components are mounted and a plastic film LCD are provided.
And a plastic film LCD electrical connection structure for electrically connecting the substrate and the plastic film LCD used in a portable electronic device having a first housing and a second housing for housing them. The substrate includes a first connection portion for electrical connection and is housed in the first housing, and the plastic film LCD includes a second connection portion for electrical connection, and the first and second substrates are connected to each other. A pressing member for pressing the two connection portions against each other;
A holding portion provided on the second housing for detachably holding the pressing member, wherein when the first and second housings are assembled, the pressing member is connected to one connecting portion. Alternatively, a plastic film LCD electrical connection structure is obtained in which the first connection portion and the second connection portion are electrically connected by pressing the vicinity thereof.

According to the present invention, in the plastic film LCD electrical connection structure, the pressing member slides in a direction intersecting a direction in which the first and second connection portions are pressed, thereby forming the second connection portion. A plastic film LCD electrical connection structure characterized in that it is detachably held by the housing.

Further, according to the present invention, in any one of the plastic film LCD electrical connection structures, at least one of the first and second connection portions is made of a flexible wiring board or a flexible flat cable. A characteristic plastic film LCD electrical connection structure is obtained.

Further, according to the present invention, in any one of the plastic film LCD electrical connection structures, the first and second connection portions are formed on one surface of each of the substrate and the plastic film LCD. Plastic film LCD characterized by being a pattern
An electrical connection structure is obtained.

Further, according to the present invention, the present invention is applied to a portable electronic device including a substrate on which electronic components are mounted, a plastic film LCD, and a first housing and a second housing for accommodating them. Plastic film L for electrically connecting the substrate to the plastic film LCD
In the CD electrical connection method, a first connection portion for electrical connection is provided on the substrate and housed in the first housing, and a second connection portion for electrical connection is provided on the plastic film LCD. A pressing member that presses the first and second connecting portions to each other to hold the pressing member to the second housing detachably, and assembles the first and second housings, A plastic film LCD electrical connection method characterized in that the pressing member presses one of the connection portions or the vicinity thereof to electrically connect the first connection portion and the second connection portion.

Further, according to the present invention, in the plastic film LCD electrical connection method, the pressing member slides in a direction intersecting a direction in which the first and second connecting portions are pressed, and And a plastic film LCD electrical connection method characterized by being detachably held in a housing of the present invention.

Further, according to the present invention, in any of the plastic film LCD electrical connection methods, a flexible wiring board or a flexible flat cable is used as at least one of the first and second connection portions. Characteristic plastic film LCD
An electrical connection method is obtained.

Further, according to the present invention, in any one of the plastic film LCD electrical connection methods, an electrode pattern is formed on one surface of each of the substrate and the plastic film LCD as the first and second connection portions. Thus, a plastic film LCD electrical connection method characterized by using the above is obtained.

[0021]

Embodiments of the present invention will be described below.

FIG. 1 is a perspective view for explaining a plastic film LCD electrical connection structure according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the electrical connection structure of FIG.

Referring to FIGS. 1 and 2, a plastic film LCD electrical connection structure includes a printed circuit board 5 of an electronic device on which electronic components are mounted, and a plastic film L.
This is a structure for electrically connecting to CD4. The printed circuit board 5 is accommodated in a housing of an electronic device (not shown) (hereinafter, referred to as a first housing).

An FPC is provided on a part of the printed circuit board 5 of the electronic device.
Connector 6 is provided. The FPC connector 6 is connected to a flexible wiring board or a flexible flat cable (hereinafter, referred to as an FPC including both).
3), and an electrode pattern 3a as a first connection portion is formed on one surface of the other end.

On the other hand, at one end of the plastic film LCD 4, an electrode pattern 4a is formed as a second connecting portion.

The printed circuit board 5 and the plastic film LCD 4 are connected to a flexible wiring board or a flexible flat cable (hereinafter referred to as FPC including both).
3 are connected.

Referring to FIG. 2, to connect the printed board 5 and the plastic film LCD4, the printed board 5, the plastic film LCD4, and the FPC3 are stacked in this order. At this time, the electrode pattern 4a as the second connection part of the plastic film LCD4 and the electrode pattern 3a of the FPC 3 as the first connection part are overlapped, and FP
The other end of C3 is inserted into the FPC connector 6 soldered to the printed circuit board 5 in advance, and the other end of the FPC 3 is brought into contact with the electrode portion 4a at the other end of the plastic film LCD4 by the pressing spring 1 of the pressing member 10. The portion 1c is pressed so as to be on the lower side, and the state as shown in FIG. 1 is established, and the printed circuit board 5 and the plastic film LCD4 are electrically connected.

FIGS. 3A and 3B are views for explaining a pressing member of the connection structure of FIG. 1, wherein FIG.
(B) is a perspective view seen from the bottom surface side. FIG. 4 shows FIG.
It is a top view which shows the pressing member of (a) and (b). FIG.
FIG. 4 is a front view showing the pressing member of FIGS. 3A and 3B.

Referring to FIGS. 3 (a), 3 (b) to 5, the pressing member 10 is made of a U-shaped insulator 2 and a metal piece having a substantially L-shaped spring property mounted on the insulator 2. And a pressing spring 1.

The insulator 2 has a rectangular concave portion 2c cut from the front side toward the inside, and the front surface of the concave portion 2c corresponds to the pressing spring 1 from one surface side of the insulator 2. A cut groove 2b that has been cut,
And a holding hole 2a.

A plurality of pressing springs 1 are arranged at intervals along the length direction of the insulator 2. Each pressing spring 1 is provided with a holding hole 2 of an insulator 2.
a and a base 1b mounted horizontally on the base plate 1b, and bent from the base 1b to the bottom side of the insulator 2 to form an insulator 2
And a contact portion 1c that extends obliquely on the bottom surface of the contact hole.

FIG. 6 is a view for explaining the mounting operation of the pressing member 10 shown in FIGS. FIG. 7 is a diagram showing a state where the pressing member 10 is mounted. Referring to FIG. 6, a pressing member fixing portion 7 a protruding in a U-shape is formed on one surface of a housing (hereinafter, referred to as a second housing) 7. The pressing member fixing portion 7a is formed with a guide groove 7b that is open at one end and engages with the guide portions 2d and 2e of the pressing member.
As a result, the pressing member 10 is guided and inserted into the second housing 7 and fixed by screws or the like, as shown in FIG.
The state is fixed to the inner surface of the second housing 7.

FIGS. 8 and 9 show plastic film LC.
FIG. 5 is a cross-sectional view for explaining a connection operation of D4, and FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to line AA of FIG.

As shown in FIG. 8, one end of the FPC 3 is connected to the FPC connector 6 provided on the printed circuit board 5 and one end of the other end of the FPC 3 is a plastic film LCD 4 mounted on the printed circuit board 5. Layered on top. At this time, the electrode pattern 3 on the lower surface of one end of the FPC 3
a and the electrode pattern 4a on the lower surface of one end of the plastic film LCD4. Here, the pressing member 10 is attached to the second housing 7 by inserting the insulator 2 into the pressing member fixing portion 7a, and is fixed to the second housing 7 with a screw or the like.

As shown in FIG. 9, when the second housing 7 is overlapped, the pressing member fixing portion 7a of the second housing 7 is formed.
The pressing member 10 fixed to the contact portion 1c of the pressing spring 1
By pressing the electrode pattern 3a of the FPC 3 toward the electrode pattern 4a of the printed circuit board from the side opposite to the surface on which the electrode pattern 3a of the FPC 3 is formed, the electrode pattern 4a of the plastic film LCD4 and the electrode pattern 3a of the FPC 3 come into contact. Electrical connection.

The connected electrode patterns 3a and 4a
Are connected by the spring force of the pressing spring 1 of the pressing member 10, so that the seventh housing 7 is lifted and the pressing member 10 is
The plastic film LCD4 can be easily attached and detached by releasing the, and has durability against a vertical dimension change due to a temperature change or the like.

Further, since the pressing spring 1 of the pressing member 10 does not directly contact the electrode pattern 4a of the plastic film LCD 4, the pressure is not concentrated on one point of the electrode pattern 4a, and the pattern can be prevented from being damaged.

Further, since a wide range of patterns are brought into contact with each other, a stable connection with a large contact area can be obtained.

FIG. 10 is a view for explaining an example of use of a plastic film LCD electrical connection structure according to the first embodiment of the present invention, and FIG. 11 is a diagram showing a main part of the plastic film LCD electrical connection structure used in FIG. It is an exploded perspective view which shows a part.

As shown in FIGS. 10 and 11, a mobile phone 20 as an electronic device includes a first housing 8 and a second housing 7 that are connected to each other. A pressing member is mounted on the fixing portion 7a on the inner surface of the second housing 7. Further, a printed board 5 in the first housing 8 and a plastic film LCD 4 are provided. One end is attached to the FPC connector 6 provided on the printed circuit board 5, and the other end is overlapped with the plastic film LCD 4. When the first and second housings 8 and 7 are closed, the pressing spring 1 of the pressing member 10 presses one end of the FPC 3,
The printed board 5 and the plastic film LCD 4 are electrically connected.

FIG. 12 is a sectional view showing a plastic film LCD connection structure according to a second embodiment of the present invention. As shown in FIG. 12, the electrode pattern 4a of the plastic film LCD4 as the second connection part is directly on the conductor pattern 5a of the printed circuit board 5 as the first connection part.
And the pressing spring 1 provided in the second housing 7
By pressing on this, mutual contact can be obtained.

Although the above embodiment has been described with reference to a mobile phone as an example, the present invention is not limited to this mobile phone, but includes first and second housings and uses a plastic film LCD. Obviously, it can be used in any small electronic device.

[0043]

As described above, according to the present invention,
Since the LCD and the printed circuit board can be connected without thermocompression bonding of the FPC, it is possible to provide a plastic film LCD electric connection structure and a connection method which can provide a good yield and can easily replace the LCD.

Further, according to the present invention, since the connection is made by pressing using a pressing spring, it is possible to absorb a dimensional change due to a temperature change or the like and to obtain a stable connection of the plastic film LCD. A structure and connection method can be provided.

Further, according to the present invention, since the structure is pressed from above the FPC placed on the electrode pattern of the plastic film LCD, pressure is not concentrated on one point of the electrode pattern of the plastic film LCD, and the pattern is damaged. A plastic film LCD electrical connection structure and connection method that can be prevented can be provided.

Further, according to the present invention, there is provided a plastic film LCD electrical connection structure and a connection method capable of obtaining a stable connection with a large contact area for contacting a wide range of patterns of the plastic film LCD and the FPC. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a plastic film LCD electrical connection structure according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the connection structure of FIG. 1;

3A and 3B are views for explaining a pressing member of the connection structure of FIG. 1, wherein FIG. 3A is a perspective view as viewed from a top side, and FIG. 3B is a perspective view as viewed from a bottom side.

FIG. 4 is a top view showing the pressing member of FIGS. 3 (a) and 3 (b).

FIG. 5 is a front view showing the pressing member of FIG. 3;

FIG. 6 is a diagram which is used for describing the mounting operation of the pressing member 10 shown in FIGS. 3 to 5;

FIG. 7 is a view showing a state where the pressing member 10 is mounted.

8 is a cross-sectional view for explaining a connection operation of the plastic film LCD4, and is a cross-sectional view taken along a line AA in FIG.

9 is a cross-sectional view for explaining a connection operation of the plastic film LCD4, and is a cross-sectional view taken along a line AA in FIG.

FIG. 10 is a diagram provided for explaining one usage example of the plastic film LCD electrical connection structure according to the first embodiment of the present invention.

FIG. 11 is an exploded perspective view showing a main part of the connection structure used in FIG. 10;

FIG. 12 is a sectional view showing a plastic film LCD electrical connection structure according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressing spring 1c Contact part 2 Insulator 2a Holding hole 2b Cut groove 2c Depression 2e Guide part 3 FPC 3a Electrode pattern 4 Plastic film LCD 4a Electrode pattern 5 Printed circuit board 6 FPC connector 7,8 Housing 7a Pressing member fixing part 10 Pressing Element

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuaki Ibaraki 1-21-2 Dogenzaka, Shibuya-ku, Tokyo Japan Aviation Electronics Industry F-term (reference) 2H092 GA50 GA56 NA18 NA29 5E023 AA04 BB23 CC23 CC26 DD25 EE06 HH21 HH28 5E344 AA01 AA02 AA15 AA22 AA26 AA28 BB02 BB03 BB04 CD29 DD08 DD09 EE21 EE23 EE30 5G435 AA17 AA19 BB12 EE46 EE47

Claims (8)

[Claims] 1. A substrate and a plastic for use in a portable electronic device comprising a substrate on which electronic components are mounted, a plastic film LCD, and a first housing and a second housing for accommodating them. In a plastic film LCD electrical connection structure for electrically connecting a film LCD, the substrate is provided with a first connection portion for electrical connection and is housed in the first housing, and the plastic film LCD is electrically connected to the film LCD. A second connecting portion for connecting the first and second connecting portions to each other; and a pressing member for pressing the first and second connecting portions to each other, and a pressing member provided to detachably hold the pressing member on the second housing. A holding portion, and when the first and second housings are assembled, the pressing member presses one of the first and second connection portions or the vicinity thereof, and the first Contact A plastic film LCD electrical connection structure, wherein the connection portion is electrically connected to the second connection portion. 2. The plastic film L according to claim 1,
In the CD electrical connection structure, the pressing member slides in a direction intersecting a direction in which the first and second connection portions are pressed, and is detachably held by the second housing. Plastic film LCD electrical connection structure. 3. The plastic film LCD electrical connection structure according to claim 1, wherein at least one of said first and second connection portions is made of a flexible wiring board or a flexible flat cable. Plastic film LCD electrical connection structure. 4. The plastic film LCD electrical connection structure according to claim 1, wherein said first and second connection portions are formed by said substrate and said plastic film LC.
D. An electrical connection structure for a plastic film LCD, characterized in that the electrode pattern is formed on one surface of each of D. 5. The substrate and the plastic for use in a portable electronic device including a substrate on which electronic components are mounted, a plastic film LCD, and a first housing and a second housing for accommodating them. In a plastic film LCD electrical connection method for electrically connecting a film LCD, a first connection portion for electrical connection is provided on the substrate and housed in the first housing. A second connecting portion for electrical connection is provided, and a pressing member for pressing the first and second connecting portions to each other is detachably held on the second housing, and the first and second connecting portions are detachably held. When the second housing is assembled, the pressing member presses one of the connection portions or the vicinity thereof to electrically connect the first connection portion and the second connection portion. LCD LCD electrical connection method. 6. The plastic film L according to claim 5,
In the CD electrical connection method, the pressing member slides in a direction intersecting a direction in which the first and second connection portions are pressed, and is detachably held on the second housing. Plastic film LCD electrical connection method. 7. The method according to claim 5, wherein a flexible wiring board or a flexible flat cable is used as at least one of the first and second connection parts. Plastic film LCD electrical connection method. 8. The method for electrically connecting a plastic film LCD according to claim 5, wherein said first and second connection portions each have an electrode pattern formed on one surface of each of said substrate and said plastic film LCD. A plastic film LCD electrical connection method characterized by using: