JPH11214804A - Circuit board, liquid-crystal display and electronic equipment and manufacture of electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a circuit board having high reliability, in which the axial direction of a coil is changed easily without altering the mounting process of the coil and the generation of noises can be prevented. SOLUTION: A coil 86 is loaded on a circuit board body 78 in the circuit board 66. The circuit board body 18 has a coil loading section 84 projected to the outside in a peripheral section 82, the coil 86 is loaded while the axial direction crosses at right angles with the surface of the coil loading section 84, and the periphery of at least the coil loading section 84 in the circuit board body 78 has flexibility, and is formed in a bendable manner at a fixed angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board, a liquid crystal display, an electronic device, and a method for manufacturing an electronic device.

[0002]

BACKGROUND OF THE INVENTION In recent years,
Electronic devices such as pagers and mobile phones have become widespread, and liquid crystal display devices have been used for such electronic devices.

As an example of such an electronic device, a portable telephone is shown in FIGS.

The mobile phone 10 uses a liquid crystal display device 12 for a display unit. The liquid crystal display device 12 is provided on the back of a liquid crystal display panel 14 as an EL (Electro Electroluminescence) as a backlight.
Luminescence) 16 on the motherboard 18
It is provided above.

[0005] A speaker 20 is provided on the motherboard 18.

The liquid crystal display panel 14 has a TCP (Tape Carrier Package) 2 on which a liquid crystal drive circuit 22 is mounted.
This TCP 24 is connected to an FPC (Flexible PPC) on which an EL drive circuit 26 for the EL 16 and a coil 28 are mounted.
rinted circuit) 30 is connected.

However, in such a mobile phone 10, the coil 28 for the EL 16 has its axial direction aligned with the FPC 30.
Is mounted on the motherboard 18 in a position close to the speaker 20 and in the axial direction of the coil (not shown) of the speaker 20. Coil 28 and speaker 2
There is a problem that the directions of the magnetic fluxes of the coil 0 and the magnetic fluxes of the coils 0 coincide with each other, the magnetic fluxes of the two interfere with each other, magnetic coupling occurs, and noise noise is generated from the speaker 20.

The present invention has been made in view of the above-mentioned problems, and has as its object to easily change the axial direction of the coil without changing the mounting process of the coil.
An object of the present invention is to provide a highly reliable circuit board, a liquid crystal display device, an electronic device, and a method for manufacturing an electronic device that can prevent generation of noise.

[0009]

According to a first aspect of the present invention, there is provided a circuit board having a coil mounted on a coil mounting portion of a circuit board body, wherein the coil is mounted on a surface of the coil mounting portion. On the other hand, the circuit board body is mounted so as to be orthogonal to the axial direction, and the circuit board main body is formed so as to be able to bend the coil mounting portion at a predetermined angle by giving flexibility at least around the coil mounting portion. And

According to the first aspect of the present invention, since the coil is mounted with the axial direction orthogonal to the surface of the coil mounting portion, mounting can be performed in a stable state, and the mounting process is changed. Without the need for efficient mounting in the same automatic mounting process as before, such as reflow furnaces and flash surfaces.
Moreover, the reliability of mounting can be ensured.

Also, at least the periphery of the coil mounting portion has flexibility, and the axial direction of the coil can be easily changed by bending the coil mounting portion at a predetermined angle.
Even in the case where a speaker or the like is provided in the vicinity, it is possible to prevent the magnetic coupling by making the direction different from the axial direction of the coil of the speaker, thereby preventing the generation of noise noise.

[0012] The circuit board according to the second aspect of the present invention comprises:
In a circuit board with a coil mounted on the circuit board body,
The circuit board body has a coil mounting portion projecting outward at a peripheral portion, the coil is mounted so that an axial direction is orthogonal to a surface of the coil mounting portion, and the circuit board body is
The coil mounting portion is formed so that it can be bent at a predetermined angle by providing flexibility at least around the coil mounting portion.

According to the second aspect of the present invention, since the coil is mounted with the axial direction orthogonal to the surface of the coil mounting portion, mounting can be performed in a stable state, and the mounting process is changed. Without the need for efficient mounting in the same automatic mounting process as before, such as reflow furnaces and flash surfaces.
Moreover, the reliability of mounting can be ensured.

Further, the periphery of the coil mounting portion formed to protrude outward from the peripheral portion of the circuit board has flexibility. By bending the coil mounting portion at a predetermined angle, the axial direction of the coil can be easily changed. This can be changed, and even when a speaker or the like is arranged in the vicinity, it is possible to prevent the magnetic coupling by making the direction different from the axial direction of the coil of the speaker, thereby preventing the generation of noise noise.

According to a third aspect of the present invention, in the first or second aspect, the circuit board main body is formed of a flexible substrate, and an EL drive circuit is mounted on the circuit board main body. Is characterized by forming an EL drive circuit.

According to the third aspect of the present invention, the first aspect is provided.
Alternatively, in addition to the state 2, when the EL is used as the backlight, the axial direction of the coil for the EL can be easily changed.

According to a fourth aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal display panel;
A liquid crystal display device having L and an EL drive circuit for driving the EL includes a circuit board on which the EL drive circuit according to claim 3 is mounted.

According to the invention described in claim 4, according to claim 3,
In addition to the features of the circuit board described above, the axial direction of the coil for EL of the liquid crystal display device having EL can be easily changed.

According to a fifth aspect of the present invention, there is provided an electronic apparatus having a liquid crystal display device and a coil disposed near the liquid crystal display device, wherein the liquid crystal display device having the EL drive circuit according to the fourth aspect is provided. A supporting member that supports the coil mounting portion of the circuit board body in a bent state, and arranges an axial direction of the EL coil in a direction different from an axial direction of the coil arranged near a liquid crystal display device. It is characterized by.

According to the invention set forth in claim 5, according to claim 4,
In addition to the features of the liquid crystal display device described above, the axial direction of the coil for EL is different from the axial direction of the coil arranged near the liquid crystal display device by supporting the coil mounting portion of the circuit board body in a bent state by the support member. It can be easily arranged in the direction.

According to a sixth aspect of the present invention, in the fifth aspect, the coil disposed near the liquid crystal display device is a coil constituting a speaker.

According to the invention of claim 6, according to claim 5,
In addition to the above condition, by arranging the axial direction of the EL coil in a direction different from the axial direction of the speaker coil, the magnetic flux between the EL coil and the speaker coil interferes, and noise noise is generated from the speaker. Can be prevented.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the support member is an inner surface of a side wall of a device housing.

According to the invention described in claim 7, when the liquid crystal display device is assembled in the equipment housing, the coil mounting portion of the circuit board main body is supported in a bent state by the inner surface of the side wall of the equipment housing to provide an EL device. The axial direction of the coil can be easily arranged in a direction different from the axial direction of the coil arranged near the liquid crystal display device. In addition, no special member is required for supporting the coil mounting portion, and the cost is reduced. Can be.

According to an eighth aspect of the present invention, there is provided a method of manufacturing an electronic device according to any one of the fifth to seventh aspects, wherein the method projects outside the peripheral edge of the circuit board body. A step of forming a liquid crystal display device in which a coil constituting an EL drive circuit is mounted on a coil mounting portion so that an axial direction thereof is orthogonal to a surface of the coil mounting portion, and when the liquid crystal display device is incorporated in an electronic device. Supporting the coil mounting portion of the circuit board main body in a bent state by the supporting member, and arranging the axial direction of the EL coil in a direction different from the axial direction of the coil arranged near the liquid crystal display device. , Is included.

According to the eighth aspect of the present invention, the coil can be stably mounted on the coil mounting portion of the circuit board to achieve automatic mounting, and the quality can be maintained. In addition, when the liquid crystal display device is incorporated in the electronic device, the coil mounting portion of the circuit board main body can be easily supported in a bent state by the support member.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below more specifically with reference to the drawings.

FIGS. 1 to 3 show a portable telephone according to an embodiment of the present invention.

FIG. 2 shows a schematic diagram of a mobile phone 50. The mobile phone 50 has a liquid crystal display device 54 incorporated as a display unit in a device housing 52.

The liquid crystal display device 54 has various electro-optical characteristics such as TN type, STN type, guest host type, polymer dispersion type, phase transition type, and ferroelectric liquid crystal type. Can be adopted. In terms of driving method, simple matrix driving, static driving, TF
Three-terminal switching element represented by T or MIM
An active matrix liquid crystal display device using a two-terminal switching element represented by the formula (1) can be employed.

The device housing 52 comprises upper and lower housings, but FIG. 2 shows only the lower side. A motherboard 56 is provided in the device housing 52, and a power supply circuit, a speaker 58, and the like (not shown) are provided on the motherboard 56. The liquid crystal display device 54 uses an EL 60 as a backlight, and is provided on a motherboard 56 while being held by a frame 62 in a state where the EL 60 is arranged on the back surface of a liquid crystal display panel 64.

The liquid crystal display panel 64 has a structure in which liquid crystal is sealed between two transparent substrates having transparent electrodes formed on opposing surfaces. As the transparent substrate, a hard material such as glass or hard plastic or a flexible material such as polycarbonate or polyacrylate is used.

Further, a flexible circuit board 66 is connected to the liquid crystal display panel 64, and is connected to the motherboard 56 via the circuit board 66.

The circuit board 66 is, as shown in FIG.
P68 and FPC70 are connected.
The CP 68 is connected to the liquid crystal display panel 64 and the FPC 70
Are connected to the motherboard 56.

The TCP 68 is equipped with a liquid crystal drive circuit 72 for driving a liquid crystal.

The FPC 70 has an EL driving circuit 74 for driving the EL 60 and a peripheral circuit 76 for the EL 60 mounted thereon.

The FPC 70 has a coil mounting portion 84 projecting outward on a peripheral portion 82 of the circuit board main body 78 adjacent to the inner surface of the side wall 80 of the device housing 52 when incorporated into the device housing 52. The coil 86 for the EL 60 is mounted on the coil mounting portion 84 with its axial direction orthogonal to the surface of the circuit board main body 78.

Then, the circuit board main body 78 is
The device housing 5 as a support member in a state where it is incorporated in
The coil mounting portion 84 is supported in a vertically bent state by the inner surface of the second side wall 80, and the axial direction of the coil 86 is
It is converted to 0 ° so that it is oriented in the horizontal direction.

Therefore, the axial direction of the coil (not shown) of the speaker 58 is vertical and the coil 86 for the EL 60 is
Since the axial direction of the speaker 5 is orthogonal to this, the speaker 5
Thus, it is possible to prevent the magnetic fluxes of the coil 8 and the coil 60 for the EL 60 from interfering with each other to cause magnetic coupling, thereby preventing the speaker 58 from generating noise noise.

Moreover, since the coil 86 for the EL 60 is located on the side wall 80 side of the device housing 52 and is located at a position away from the coil of the speaker 58, magnetic coupling can be further prevented.

Next, a method of manufacturing the above-described mobile phone 50 will be described.

First, a coil mounting portion 84 is formed so as to protrude from a peripheral portion of the circuit board body 78 of the FPC 70 on the side wall 80 side of the device housing 52.

Next, cream solder or the like is applied on the coil mounting portion 84, and the coil 86 for the EL 60 is mounted.

In this case, by mounting the coil 86 in a state where the axial direction of the coil 86 is orthogonal to the surface of the coil mounting portion 84,
The coil 86 is supported on the coil mounting portion 84 in a stable state.

Next, the coil 86 is connected to the coil mounting portion 8.
In a state of being stably supported by 4, for example, it is transferred to a reflow furnace and soldered. Coil mounting portion 84 of coil 86
Attachment to the surface can also be performed by a process such as a flash surface.

As described above, the coil 86 is connected to the coil mounting portion 8.
4, the coil 86 can be mounted in the automatic mounting process, and the process can be simplified and the quality can be maintained as compared with the case where the coil 86 is mounted horizontally. can do.

The EL drive circuit 74 and the peripheral circuit 76 are mounted in the same manner.

In this state, the coil mounting portion 84 is in a flat state extending straight from the circuit board main body 78 as shown in the upper position of FIGS.

Next, the thus formed FPC7
0 is connected to the TCP 68 to form the circuit board 66, and the TCP 68 is connected to the liquid crystal display panel 64 to obtain the state shown in FIG.

Next, EL6 is placed on the back of the liquid crystal display panel 64.
2 is mounted on the motherboard 56 in the device housing 52 with the circuit board 66 folded back to the back side of the EL 60 as shown in FIG.

In this case, as shown in FIG. 3, when the circuit board main body 78 and the coil mounting portion 84 are flat, the coil mounting portion 84 comes into contact with the side wall 80 of the device housing 52 during assembly, and And is supported in that state, and the axial direction of the coil 86 is 90 °.
゜ It will be converted and positioned in the horizontal direction.

As described above, when the liquid crystal display device 54 is incorporated in the device housing 52, the axial direction of the coil 86 can be easily changed, and the device housing 5 is used as a support member.
Since the inner surface of the second side wall 80 is used, there is no need to newly provide a support member, and the cost can be reduced.

In the state where the coil mounting portion 84 is bent,
If necessary, the coil mounting portion 84 and the inner surface of the side wall 80 may be bonded with an adhesive.

FIG. 4 is a diagram showing another embodiment of the present invention.

In this embodiment, notches 88 are formed on both sides of the bending position of the coil mounting portion 84, thereby facilitating the bending of the coil mounting portion 84.

The other constructions and operations are the same as those of the first embodiment, and the common parts are denoted by the same reference numerals, and the description is omitted.

FIG. 5 is a diagram showing still another embodiment of the present invention.

In this embodiment, a coil mounting portion 84 is formed inside the circuit board main body 78.

The coil mounting section 84 includes the coil mounting section 8
Of the four peripheral sides of 4, one side is left, and three sides are formed with slits 90 that are substantially continuous in a U-shape. The three sides are separated from the circuit board main body 78, and are continuous with the circuit board main body 78. The side is a wiring portion 92 having flexibility by the material of the circuit board main body 78.

Then, the coil 8 is placed on the coil mounting portion 84.
The coil mounting portion 84 is mounted by mounting the coil 86 in a state where the axial direction of 6 is orthogonal to the surface of the coil mounting portion 84 and pushing up the coil mounting portion 84 by a projecting support member from the lower surface side. The coil portion 86 is supported in a state of being bent by 90 ° about the wiring portion 92, so that the axial direction of the coil 86 is converted to a horizontal state.

Incidentally, slits are formed slightly at both ends of the wiring portion 92 so as to facilitate bending.

Further, in this example, the circuit board body 78 has flexibility, but it is not always necessary to be a flexible circuit board body.
(Printed Curcuit Bord) may be used, and a part of the coil mounting portion may be punched, and the PCB and the punched coil mounting portion may be connected by FFC (Flexible Flat Cable).

The other constructions and operations are the same as those in the first embodiment, and the common parts are denoted by the same reference numerals, and the description is omitted.

The embodiment of the present invention has been described above.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention or within the equivalent scope of the claims.

For example, in each of the above embodiments, a portable telephone is shown as an electronic device. However, the present invention is not limited to this example, and various electronic devices such as an electronic organizer, a pager, and a calculator can be considered.

The liquid crystal display device may be a liquid crystal display device having an input function having an input function.

Further, the coil on the circuit board side is not limited to the coil for EL, but may be any coil mounted on the circuit board, and there is no particular limitation.

Further, the coil mounting portion is formed on the peripheral portion on the side wall side of the equipment housing, but the location is not particularly limited as long as it is the peripheral portion.

Further, although the inner surface of the side wall of the equipment housing is used as the support member, the invention is not limited to this example, and the support member may be made to protrude from the equipment housing.

Further, TCP and FPC are used as circuit boards.
, And may be formed as a single circuit board.

Further, the circuit board has a flexible circuit board body as a whole, but is not limited to this example.
As long as at least the coil mounting portion has a bendable flexibility, others need not necessarily have flexibility.

[Brief description of the drawings]

FIG. 1 is a front view showing a liquid crystal display panel and a circuit board of a mobile phone according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view of the mobile phone according to the present embodiment.

FIG. 3 is a cross-sectional view showing an assembled state of a coil mounting portion in the present embodiment.

FIG. 4 is a front view showing a liquid crystal display panel and a circuit board of a mobile phone according to another embodiment.

FIG. 5 is a partial plan view showing a circuit board body according to still another embodiment.

FIG. 6 is a front view showing a liquid crystal display panel and a circuit board of a conventional mobile phone.

FIG. 7 is a partial cross-sectional perspective view of a conventional mobile phone.

[Explanation of symbols]

 REFERENCE SIGNS LIST 50 mobile phone 52 device housing 54 liquid crystal display device 56 motherboard 58 speaker 60 EL 64 liquid crystal display panel 66 circuit board 68 TCP 70 FPC 72 liquid crystal drive circuit 74 EL drive circuit 78 circuit board main body 80 side wall 82 peripheral portion 84 coil mounting portion 86 Coil 90 Slit 92 Wiring section

Claims (8)

[Claims] 1. A circuit board having a coil mounted on a coil mounting portion of a circuit board main body, wherein the coil is mounted so that an axial direction is orthogonal to a surface of the coil mounting portion, and the circuit board main body is at least A circuit board, wherein the coil mounting portion is formed so as to be bent at a predetermined angle by providing flexibility around the coil mounting portion. 2. A circuit board having a coil mounted on a circuit board main body, wherein the circuit board main body has a coil mounting portion projecting outward at a peripheral portion, and the coil is mounted on a surface of the coil mounting portion. On the other hand, the circuit board body is mounted so as to be orthogonal to the axial direction, and the circuit board main body is formed so as to be able to bend the coil mounting portion at a predetermined angle by giving flexibility at least around the coil mounting portion. A featured circuit board. 3. The circuit board body according to claim 1, wherein the circuit board body is formed of a flexible substrate, an EL drive circuit is mounted on the circuit board body, and the coil constitutes an EL drive circuit. A circuit board, comprising: 4. A liquid crystal display device having a liquid crystal display panel, an EL for illuminating the liquid crystal display panel, and an EL drive circuit for driving the EL, wherein a circuit board on which the EL drive circuit according to claim 3 is mounted is provided. A liquid crystal display device comprising: 5. An electronic apparatus having a liquid crystal display device and a coil disposed near the liquid crystal display device, wherein the liquid crystal display device has an EL drive circuit according to claim 4, and a coil mounting portion of the circuit board main body. And a support member that supports the EL coil in a bent state, and arranges the axial direction of the EL coil in a direction different from the axial direction of the coil arranged near the liquid crystal display device. 6. The electronic device according to claim 5, wherein the coil arranged near the liquid crystal display device is a coil constituting a speaker. 7. The electronic device according to claim 5, wherein the support member is an inner surface of a side wall of the device housing. 8. The method for manufacturing an electronic device according to claim 5, wherein the coil mounting portion protruding outward from a peripheral portion of the circuit board body.
A step of forming a liquid crystal display device mounted with a coil constituting an EL drive circuit by making an axial direction perpendicular to the surface of the coil mounting portion; and when the liquid crystal display device is incorporated in an electronic device, Supporting the coil mounting portion of the circuit board main body in a bent state, and arranging the axial direction of the coil for EL in a direction different from the axial direction of the coil arranged near the liquid crystal display device. Characteristic method of manufacturing electronic equipment.