JPH1152882A - Liquid crystal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal device having a simple and compact shape, less rattle, excellent assembling workability, the small number of parts and enhancing static electricity resistance property. SOLUTION: By engaging engagement pawl parts 4a formed on a first hold member 4 with engagement hole parts 5a formed on a second hold member 5, the first, second hold members 4, 5 are engaged with each other on the position keeping a compression type connector 2 to a compressive state of a prescribed amount. Further, by engaging engagement projection parts 3c formed on a flexible printed circuit board 3 with the engagement hole parts 5a of the second hold member 5, a fall of the flexible printed circuit board 3 from the second hold member 5 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal device which is mounted on an electronic device or the like and displays the status of the device or the like.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display device, which is an example of a liquid crystal device, has been used in various devices because of its many advantages such as "thin", "simplified structure", and "low power consumption". This liquid crystal display device generally has a liquid crystal display section in which liquid crystal is sealed between two transparent glasses, a flexible printed circuit board for applying a predetermined driving voltage to the liquid crystal display section, and both are electrically connected. It is made up of connectors that let you make contact.

FIG. 5 is a cross-sectional view of a liquid crystal display section as a conventional example, to which the one proposed in JP-A-6-265851 is applied. In the figure, reference numeral 14 denotes a holding member, in which a flexible printed circuit board 13 positioned in a positioning dowel 14a is inserted into a slit 14b, and a press-connecting connector 12 is installed in a first recess 14c connected to the slit 14b. Part 11 is the first
The second recess 14d is connected to the second recess 14c.

Reference numeral 15 denotes a pressing member which is positioned at the positioning dowel 14e of the holding member 14, and is fixed with screws 16 against the compression reaction force of the press-connecting type connector 12.

[0005]

However, in the above-mentioned prior art, since the positioning means and the fixing means for the flexible printed circuit board 13 and the holding member 15 with respect to the holding member 14 are provided independently of each other, the shape of the holding member 14 is complicated. However, there is a disadvantage that the size and size of the pressing member 15 are increased, and that the assembling workability is deteriorated. Further, since the screws 16 are used for fixing the holding member 15, the number of components also increases.

In the above-described conventional example, when the holding member 14 and the holding member 15 are formed of a conductive material such as metal, they are not grounded. When installed near the window of the cover,
There is a problem that when static electricity from the outside enters, the static electricity may damage a liquid crystal drive circuit (not shown).

Accordingly, the present invention has been made to solve such a conventional problem, and is a liquid crystal having a simple shape and a small size, a small play, a small workability and a small number of parts. It is a primary object to provide a device. Also, without adding any other members, and without deteriorating the assembly workability at all,
It is a second object of the present invention to provide a liquid crystal device capable of improving anti-static performance.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a liquid crystal display, a flexible printed circuit board, a press-connecting connector, a first holding member, and a second holding member. The press-contact type connectors are interposed between the liquid crystal drive signal pattern exposed portion of the substrate and these are compressed and compressed by the first holding member from the liquid crystal display portion side and by the second holding member from the flexible printed board side.
An engaging claw formed on the first holding member so as to engage with each other at a position where the press-connecting connector can be maintained in a compressed state by a predetermined amount in the liquid crystal device which is conducted and held by being sandwiched. And an engagement hole formed in the second holding member, and an engagement hole formed in the flexible printed board and locked in the engagement hole of the second holding member. And an engagement protrusion for preventing the liquid crystal display unit from dropping off from the holding member when the engagement is performed. Are also set to dimensions that can be positioned with respect to each other, and the outer dimensions of the engaging projections are set to dimensions that allow positioning with respect to the second holding member in the direction in which the electrodes of the liquid crystal display unit are arranged. It is assumed that.

Further, according to the present invention, at least a part of the engaging claw portion and the engaging hole portion is perpendicular to the liquid crystal display surfaces of the first holding member and the second holding member, respectively. Are formed on at least two surfaces parallel to the arrangement direction of the liquid crystal display. The distance between the surfaces is set to a size that allows the first holding member and the second holding member to be positioned in the direction in which the electrodes of the liquid crystal display unit extend. It is characterized by being set.

Further, in the present invention, the corner portion at the tip of the engaging claw portion is chamfered or rounded.

Further, the present invention provides the first holding member and the second holding member.
The holding member is made of a conductive material such as a metal, while the flexible printed circuit board is exposed to the liquid crystal drive signal pattern exposed to the press-contact type connector,
An electrically grounded ground pattern exposed portion provided on the back side of the liquid crystal drive signal pattern exposed portion, wherein the ground pattern exposed portion is pressed by a compression reaction force of the compression type connector and the second The holding member is grounded, and the first member is further connected via the engagement hole and the engagement claw.
Is configured to be grounded.

According to the present invention, the first and second engaging members are engaged with the engaging claw portions formed on the first holding member and the engaging holes formed on the second holding member. Are engaged with each other at a position where the press-connecting connector can be maintained in a predetermined compressed state. In addition, the engaging protrusion formed on the flexible printed board is locked in the engaging hole of the second holding member, thereby preventing the flexible printed board from falling off from the second holding member. Furthermore, the external dimensions of the engaging projections and the external dimensions of the engaging holes are set so that the external dimensions of the engaging projections can be aligned with respect to the arrangement direction of the electrodes of the liquid crystal display section when engaged. The liquid crystal display and the flexible printed circuit board are correctly connected to each other by setting the dimensions of the liquid crystal display with respect to the second holding member so as to be positionable with respect to the arrangement direction of the electrodes.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 is an exploded perspective view of a liquid crystal display according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a liquid crystal display unit, which performs various displays by applying a drive signal from a flexible printed circuit board 3 via a press-connecting connector 2. Reference numerals 4 and 5 denote a first holding member and a second holding member, respectively. An engaging claw portion 4a provided on the first holding member 4 and an engaging hole portion 5a provided on the second holding member 5 are provided. Can be engaged with each other.

Hereinafter, the liquid crystal display device having the above configuration will be described in more detail.

The liquid crystal display section 1 has an upper glass 1a and a lower glass 1
b, a liquid crystal (not shown) is sealed, and a polarizing plate 1 c
The reflective polarizing plate 1d is attached. The reflective polarizing plate 1d is shown in FIG. 2 described later. The upper glass 1a is set larger than the lower glass 1b so that a transparent electrode 1e called an ISO electrode for receiving a drive signal is formed on a lower surface thereof.

The press-connecting type connector 2 has conductive portions and insulating portions alternately laminated to give directionality to the conductivity. The transparent electrode 1e of the liquid crystal display portion 1 and the flexible printed circuit board 3 are provided. And the liquid crystal drive signal pattern exposed portion 3a. Therefore, by aligning the positions, the liquid crystal drive pattern exposed portion 3a and the transparent electrode 1e can be correctly connected.

The flexible printed circuit board 3 is a so-called double-sided flexible printed circuit board having conductive patterns on both sides, and has a liquid crystal driving signal pattern for transmitting a liquid crystal driving signal generated by a liquid crystal driving circuit (not shown). A part of the liquid crystal drive signal pattern exposed portion 3a is exposed, and the liquid crystal drive signal pattern exposed portion 3a is grounded directly behind the liquid crystal drive signal pattern exposed portion 3a by an appropriate method such as connecting to a negative electrode of a battery (not shown). It has a ground pattern exposed portion 3b. The ground pattern exposed portion 3b is shown in FIG. 3c is the second
Are engaging projections used for engagement with the holding member 5.

In the present embodiment, at least the second holding member 5 of the first holding member 4 and the second holding member 5 is also formed by pressing a metal plate. There is a bent portion 4 at the side end of the first holding member 4.
b is formed, and an engaging claw 4a is formed further outward from the outer surface of the bent portion 4b. Further, a bent portion 5b is formed at the opposite side end of the second holding member 5,
An engagement hole 5a is formed in the bent portion 5b, and an expanded introduction portion 5c is formed near the tip of one of the bent portions 5b.

Further, the engaging claw 4a of the first holding member 4
Are formed on the outer side of the, and the claw portions 4c and 4d regulate the positions of the liquid crystal display unit 1 and the press-contact type connector 2, respectively.

Next, assembling of the above components will be described with reference to FIGS. In addition, each code is based on FIG.

First, as shown in FIG. 2A, the first holding member 4 is turned upside down, and the liquid crystal display unit 1 is placed against the position controlling claw 4c. As a result, the position of the liquid crystal display unit 1 is regulated with respect to the first holding member 4 in the direction in which the transparent electrodes 1e are arranged. Next, the press-connecting connector 2 is attached to the claw 4d for position control and the upper glass 1
a and the step between the lower glass 1b is set as a guide. Thus, the press-connecting connector 2 is correctly set on the transparent electrode 1e.

On the other hand, as shown in FIG. 2B, the flexible printed circuit board 3 is attached to the second holding member 5.
At this time, the engaging projection 3c of the flexible printed board 3 is fitted into the engaging hole 5a of the second holding member 5 and attached. The engagement hole 5a of the second holding member 5 is thus provided.
To prevent the flexible printed circuit board 3 from falling off from the second holding member 5,
The shape is simple, compact, and the assembling workability can be improved.

Next, the second holding member 5 is attached to the first holding member 4 on which the liquid crystal display unit 1 and the press-connecting connector 2 are installed as shown in FIG.
In order to insert the engaging claw 4a of the first holding member 4 into the engaging hole 5a on the side having the introduction portion 5c, the engaging claw 4a is inserted into the engaging hole 5a on the side having no c. The second holding member 5 is pressed down.

At this time, the engaging claw portion 4a is
As a result, the vicinity of the engagement hole 5a is deformed, and by further pressing down, the engagement claw 4a fits into the engagement hole 5a as shown in FIG.

The characteristic portions of the present invention in the above configuration will be further described.

The positions of the engaging claw portions 4a and the engaging hole portions 5a formed on the first holding member 4 and the second holding member 5, respectively, are opposed to each other against the compression reaction force of the press-contact type connector 2. The distance between the first holding member 4 and the second holding member 5 at the time of engagement is such that the pressing connector 2 between the liquid crystal display unit 1 and the flexible printed circuit board 3 is compressed by a predetermined amount. Is set.

That is, the first holding member 4 and the second holding member 5 are set so that they can be positioned in the thickness direction of the liquid crystal display unit 1. Further, by setting the outer dimensions L1 and L2 shown in FIG. 2 to be substantially the same as those of the engaging claw 4a and the engaging hole 5a, the first holding member 4 and the second holding member 5 Has a function of enabling positioning of the transparent electrodes 1e in the arrangement direction of the transparent electrodes 1e.

The engagement projection 3c of the flexible printed circuit board 3 also serves as a reference for the pattern position of the liquid crystal drive signal pattern exposure section 3a, while the external dimension L3 shown in FIG. Dimension L2 of the engagement hole 5a
By setting them to almost the same dimensions, the flexible printed circuit board 3 and the second holding member 5 also have a function of enabling positioning in the direction in which the transparent electrodes 1e are arranged.

Accordingly, the first holding member 4 whose liquid crystal display section 1 is restricted in position in the arrangement direction of the transparent electrodes 1e is the second holding member 5 in which the flexible printed circuit board 3 is positioned in the arrangement direction of the transparent electrodes 1e. And transparent electrode 1
The liquid crystal display unit 1 and the flexible printed board 3 are correctly connected because they are positioned and engaged with each other in the arrangement direction of e. As a result, it is possible to realize a liquid crystal display device that is simple and compact in shape, has good assembling workability, and has a small number of components.

On the other hand, the engaging claw 4a of the first holding member 4 is on the surface of the bent portion 4b, that is, perpendicular to the liquid crystal display surface of the liquid crystal display 1 and parallel to the direction in which the transparent electrodes 1e of the liquid crystal display 1 are arranged. It is formed on a flat surface. The engagement hole 5a of the second holding member 5 has a part thereof on the surface of the bent portion 5b, that is, perpendicular to the liquid crystal display surface of the liquid crystal display 1 and in the direction in which the transparent electrodes 1e of the liquid crystal display 1 are arranged. They are formed on parallel surfaces.
Here, by setting the dimensions L4 and L5 shown in FIG. 3 to be substantially the same, when the engaging claw 4a and the engaging hole 5a engage with each other, the first holding member 4 and the second Holding member 5
The play in the extending direction of the transparent electrode 1e, that is, in the horizontal direction in FIG. 3, can be suppressed.

As shown in FIG. 3, the corners of the distal end of the engaging claw 4a are rounded, thereby improving workability during assembly.

Further, after assembly, the press-connecting connector 2 is in a state of being compressed by a predetermined amount due to the engagement between the first holding member 4 and the second holding member 5. Therefore, the exposed portion 3b of the ground pattern is pressed against the second holding member 5 by the compression reaction force of the press-connecting type connector 2, whereby the second holding member 5 is grounded. On the other hand, in the first holding member 4 and the second holding member 5 as well, the respective engagement claws 4a and the engagement holes 5a are strongly engaged with each other due to the compression reaction force of the press-contact type connector 2, and as a result, The first holding member 4 is also grounded.

Therefore, when static electricity enters from outside when the liquid crystal display device is installed near the window of the exterior cover of the device, the installed first holding member 4 or the second holding member 5 is installed. , The liquid crystal drive circuit (not shown) is not broken.

[0035]

As described above, according to the present invention, the engaging claws formed in the first holding member and the engaging holes formed in the second holding member are engaged with each other to press-contact each other. While maintaining the mold connector in a predetermined amount of compressed state, the engaging protrusion formed on the flexible printed board is locked in the engaging hole of the second holding member, and the second holding member of the flexible printed board is fixed. By configuring to prevent falling off from
A liquid crystal display device which is simple and compact in shape, has good assembling workability, and has a small number of parts can be realized.

Further, at least a part of the engaging claw portion and the engaging hole portion are perpendicular to the liquid crystal display surfaces of the first holding member and the second holding member, respectively, and are parallel to the arrangement direction of the electrodes of the liquid crystal display portion. Are formed on at least two surfaces, and the distance between these surfaces is set to a size that allows the first holding member and the second holding member to be positioned in the direction in which the electrodes of the liquid crystal display unit extend. With such a configuration, rattling can be reduced.

In addition, by chamfering or rounding the corner portion at the tip of the engaging claw portion, the assembling workability can be further enhanced.

The exposed portion of the ground pattern of the flexible printed circuit board is subjected to the second reaction by the compression reaction force of the compression type connector.
By pressing against the holding member, the second holding member is grounded, and the first holding member is connected to the first holding member via the engagement hole and the engagement claw.
By grounding the holding member, it is possible to improve the anti-static performance without adding any other member and without deteriorating the assembly workability at all.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a part of an assembling method of the liquid crystal display device.

FIG. 3 is a diagram illustrating another part of the method of assembling the liquid crystal display device.

FIG. 4 is a sectional view showing a state where the liquid crystal display device is assembled.

FIG. 5 is a cross-sectional view illustrating a structure of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display part 1e Transparent electrode 2 Press-fit type connector 3 Flexible printed board 3a Liquid crystal drive signal pattern exposure part 3b Ground pattern exposure part 3c Engagement convex part 4 First holding member 4a Engagement claw part 5 Second holding member 5a Engagement hole

Claims (4)

[Claims] 1. A liquid crystal display section, a flexible printed board, a press-connecting connector, a first holding member, and a second holding member, wherein an electrode of the liquid crystal display section and a liquid crystal driving signal pattern exposure section of the flexible printed board are provided. Between the liquid crystal display unit side and the second holding member from the flexible printed circuit board side, thereby conducting and holding them. A liquid crystal device comprising: an engaging claw formed on the first holding member and a second holding member formed on the second holding member so as to engage with each other at a position where the press-connecting connector can be maintained in a predetermined amount of compressed state; And the second holding member is formed in the flexible printed circuit board, and is engaged with the engaging hole of the second holding member. An engaging projection for preventing the material from falling off the material, and the outer dimensions of the engaging claw and the outer diameter of the engaging hole are mutually different with respect to the arrangement direction of the electrodes of the liquid crystal display section when engaged. It is set to a size that can be positioned, and an outer dimension of the engaging projection is set to a size that can be positioned with respect to the second holding member in a direction in which the electrodes of the liquid crystal display unit are arranged. Liquid crystal devices. 2. The engaging claw portion and the engaging hole portion have at least a part thereof perpendicular to the liquid crystal display surfaces of the first holding member and the second holding member, respectively, and the arrangement direction of the electrodes of the liquid crystal display portion. Are formed on at least two planes parallel to each other, and the distance between the planes is set to a size that allows the first holding member and the second holding member to be positioned in the direction in which the electrodes of the liquid crystal display unit extend. The liquid crystal device according to claim 1, wherein 3. The liquid crystal device according to claim 1, wherein a corner portion at a tip of the engaging claw portion is chamfered or rounded. 4. The first holding member and the second holding member are both made of a conductive material such as a metal, and the flexible printed circuit board is provided with a liquid crystal drive signal pattern exposed portion which comes into contact with the press-contact type connector. An electrically grounded ground pattern exposed portion provided on the back side of the liquid crystal drive signal pattern exposed portion, wherein the ground pattern exposed portion is pressed by a compression reaction force of the compression type connector and the second 2. The liquid crystal device according to claim 1, wherein the holding member is grounded, and the first holding member is grounded via the engagement hole and the engagement claw.