JP3486531B2 - Liquid crystal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid crystal device mounted on an electronic device or the like to display 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", "simple structure", and "low power consumption". This liquid crystal display device is generally electrically connected to a liquid crystal display unit in which liquid crystal is sealed between two transparent glasses, a flexible printed circuit board for applying a predetermined drive voltage to the liquid crystal display unit, and both. It is made up of a squeeze connector.

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, 14 is a holding member, the flexible printed circuit board 13 positioned by the positioning dowel 14a is inserted into the slit 14b, and the pressure contact type connector 12 is installed in the first recess 14c connected to the slit 14b. Part ll is first
Is installed in the second recess 14d connected to the recess 14c.

A pressing member 15 is positioned on the positioning dowel 14e of the holding member 14, and is fixed by a screw 16 against the compression reaction force of the pressure contact type connector 12.

[0005]

However, in the above-mentioned conventional example, since the positioning means and the fixing means for the flexible printed circuit board 13 and the pressing 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, since the screws 16 are used to fix the pressing member 15, there is a problem that the number of parts is increased.

Further, in the above-mentioned conventional example, when the holding member 14 and the pressing member 15 are made of a conductive material such as a metal, since they are not grounded, the liquid crystal display device is mounted on the exterior of the device. When installed near the window of the cover,
There is a problem that static electricity from the outside may damage a liquid crystal drive circuit (not shown) when it invades.

Therefore, the present invention has been made in order to solve such a conventional problem, and is a liquid crystal having a simple shape and a compact shape, little rattling, good assembling workability and a small number of parts. It is a primary object to provide a device. Also, without adding any other member, and without deteriorating the assembly workability at all,
A second object is to provide a liquid crystal device capable of improving antistatic performance.

[0008]

The present invention has a liquid crystal display section, a flexible printed circuit board, a pressure contact type connector, a first holding member and a second holding member, and electrodes of the liquid crystal display section and a flexible print. The pressure contact type connector is interposed between the liquid crystal drive signal pattern exposed portion of the substrate, and these are 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.
In the liquid crystal device that is electrically connected and held by being held , the engaging claws formed on the first holding member so as to engage with each other at a position where the pressure contact type connector can be maintained in a compressed state of a predetermined amount. And an engaging hole formed in the second holding member and the flexible printed circuit board, the engaging hole formed in the second holding member is engaged with the engaging hole formed in the flexible printed circuit board. 2. The engaging projections for preventing the holding projections from falling off from the holding member, and the external dimensions of the engaging claws and the engaging holes are determined by the direction in which the electrodes of the liquid crystal display section are aligned when engaged. Also with respect to each other, the outer dimensions of the engaging projections are set to such a dimension that they can be positioned with respect to the second holding member with respect to the arrangement direction of the electrodes of the liquid crystal display section . Holding
Both the member and the second holding member have conductivity such as metal
The flexible printed circuit board is made of
Liquid crystal drive signal pattern that contacts the pressure contact type connector
The exposed part and the back side of the exposed part of the liquid crystal drive signal pattern are installed.
Exposed electrically grounded ground pattern
And the compression reaction force of the pressure contact type connector
The second holding member by pressing the exposed pattern exposed portion.
Is grounded, and further front through the engaging hole and engaging claw
Note that the first holding member is configured to be grounded .

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, and is an electrode of the liquid crystal display portion. Are formed on at least two surfaces parallel to the arranging direction, and the distance between the surfaces is such that the first holding member and the second holding member can be positioned in the extending direction of the electrodes of the liquid crystal display section. It is characterized by being set.

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

[0011]

Further, as in the present invention, by engaging the engaging claw portion formed in the first holding member and the engaging hole portion formed in the second holding member, the first and second Of the holding members are engaged with each other at a position capable of maintaining the press-connecting type connector in a predetermined compressed state. Further, the engaging convex portion formed on the flexible printed circuit board is locked in the engaging hole portion of the second holding member to prevent the flexible printed circuit board from coming off from the second holding member. Further, the outer dimensions of the engaging claw portion and the engaging hole portion are set so that they can be positioned relative to each other in the alignment direction of the electrodes of the liquid crystal display portion when engaged, The liquid crystal display section and the flexible printed circuit board are properly connected by setting the dimensions such that the second holding member can be positioned in the alignment direction of the electrodes of the liquid crystal display section.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a liquid crystal display unit, which receives a drive signal from the flexible printed circuit board 3 via the pressure contact type connector 2 to perform various displays. Reference numerals 4 and 5 are a first holding member and a second holding member, respectively, and 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. Can be engaged with each other.

The liquid crystal display device having the above structure will be described in more detail below.

The liquid crystal display unit 1 includes an upper glass 1a and a lower glass 1
A liquid crystal (not shown) is sealed between b and the polarizing plate 1c,
A reflection polarizing plate 1d is attached. The reflective polarizing plate 1d is shown in FIG. 2 described later. Further, the upper glass 1a is set to be larger than the lower glass 1b in order to form a transparent electrode 1e called an ISO electrode for receiving a drive signal on the lower surface thereof.

The pressure contact type connector 2 is formed by alternately laminating conductive parts and insulating parts, and has conductivity in a directional manner. The transparent electrode 1e of the liquid crystal display part 1 and the flexible printed board 3 are provided. It is sandwiched between the liquid crystal drive signal pattern exposed portion 3a and the liquid crystal drive signal exposed portion 3a. Therefore, the liquid crystal drive pattern exposed portion 3a and the transparent electrode 1e can be correctly connected by aligning their positions.

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 drive signal pattern for transmitting a liquid crystal drive signal generated by a liquid crystal drive circuit (not shown). A partially exposed liquid crystal drive signal pattern exposed portion 3a is formed, and the liquid crystal drive signal pattern exposed portion 3a is grounded by a proper method such as connecting to a negative electrode of a battery (not shown) directly behind the liquid crystal drive signal pattern exposed portion 3a. It has a ground pattern exposed portion 3b. The ground pattern exposed portion 3b is shown in FIG. 3 described later. Also, 3c is the second
Is an engaging convex portion used for engaging with the holding member 5.

By the way, at least the second holding member 5 of the first holding member 4 and the second holding member 5 is also the first holding member in the present embodiment, which is formed by press-molding a metal plate. There is a bent portion 4 at the side end of the first holding member 4.
b is formed, and the engaging claw portion 4a is formed further outward from the outer surface of the bent portion 4b. In addition, a bent portion 5b is formed at the opposite side end of the second holding member 5,
An engaging hole 5a is formed in the bent portion 5b, and a widened introduction portion 5c is formed near the tip of one bent portion 5b.

Further, the engaging claw portion 4a of the first holding member 4
Position regulating claws 4c and 4d are formed on the outer side of the claws 4c and 4d. The claws 4c and 4d regulate the positions of the liquid crystal display unit 1 and the pressure contact type connector 2, respectively.

Next, the assembling of each of the above parts will be described with reference to FIGS. Note that each reference sign 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 installed by abutting against the position regulating claw portion 4c. As a result, the position of the liquid crystal display unit 1 is restricted with respect to the first holding member 4 with respect to the arrangement direction of the transparent electrodes 1e. Next, the pressure contact type connector 2 is provided with the position controlling claw portion 4d and the upper glass 1
The step between a and the lower glass 1b is installed as a guide. As a result, the pressure contact type connector 2 is correctly installed on the transparent electrode 1e.

On the other hand, as shown in FIG. 2B, the flexible printed board 3 is attached to the second holding member 5.
At this time, the engaging convex portion 3c of the flexible printed circuit board 3 is fitted into the engaging hole portion 5a of the second holding member 5 and attached. In addition, the engagement hole portion 5a of the second holding member 5 is
By locking the flexible printed circuit board 3 to prevent the flexible printed circuit board 3 from falling off the second holding member 5,
The shape is simple, compact, and the workability of assembly 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 pressure contact type connector 2 are installed as shown in FIG.
To insert the engaging claw portion 4a of the first holding member 4 into the engaging hole portion 5a on the side without c, and then insert the engaging claw portion 4a into the engaging hole portion 5a on the side having the introducing portion 5c. The second holding member 5 is pressed down.

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

The characteristic portion of the present invention having the above-described structure will be further described.

The positions of the engaging claws 4a and the engaging holes 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 pressure contact type connector 2. When engaged, the distance between the first holding member 4 and the second holding member 5 is such that the pressure contact type connector 2 between the liquid crystal display unit 1 and the flexible printed circuit board 3 is compressed by a predetermined amount. It is set.

That is, the first holding member 4 and the second holding member 5 are set to be positionable in the thickness direction of the liquid crystal display unit 1. Further, the engaging claw portion 4a and the engaging hole portion 5a are set to have substantially the same outer dimensions L1 and L2 shown in FIG. 2, respectively, so that the first holding member 4 and the second holding member 5 are formed. It also has a function of positioning and in the direction of arrangement of the transparent electrodes 1e.

The engaging convex portion 3c of the flexible printed circuit board 3 serves as a reference for the pattern position of the liquid crystal drive signal pattern exposing portion 3a, while the external dimension L3 shown in FIG. Outer dimension L2 of the engaging hole portion 5a of
By setting the dimensions to be almost the same, the flexible printed circuit board 3 and the second holding member 5 can also be positioned with respect to the arrangement direction of the transparent electrodes 1e.

Therefore, the first holding member 4 in which the position of the liquid crystal display unit 1 is regulated in the arrangement direction of the transparent electrodes 1e, and 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 circuit board 3 are correctly connected because they are positioned and engaged with respect to the arrangement direction of e. As a result, it is possible to realize a liquid crystal display device which has a simple shape and is compact, has good assembly workability, and has a small number of parts.

On the other hand, the engaging claw portion 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 portion 1 and parallel to the arrangement direction of the transparent electrodes 1e of the liquid crystal display portion 1. Is formed on a flat surface. Further, a part of the engaging hole portion 5a of the second holding member 5 is on the surface of the bent portion 5b, that is, perpendicular to the liquid crystal display surface of the liquid crystal display portion 1 and in the alignment direction of the transparent electrodes 1e of the liquid crystal display portion 1. It is formed on parallel surfaces.
Here, by making the dimensions L4 and L5 shown in FIG. 3 substantially the same, when the engagement claw portion 4a and the engagement hole portion 5a are engaged with each other, the first holding member 4 and the second holding member 4 are Holding member 5
It is possible to suppress rattling in the extending direction of the transparent electrode 1e, that is, the horizontal direction in FIG.

Further, as shown in FIG. 3, the tip corners of the engaging claws 4a are rounded to improve workability in assembling.

After assembly, the pressure contact type connector 2 is in a state of being compressed by a predetermined amount by the engagement of the first holding member 4 and the second holding member 5. Therefore, the ground pattern exposed portion 3b is pressed against the second holding member 5 by the compression reaction force of the pressure contact 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, the engaging claw portions 4a and the engaging hole portions 5a are strongly engaged with each other due to the compression reaction force of the pressure contact type connector 2. The first holding member 4 is also grounded.

Therefore, when this liquid crystal display device is installed near the window portion of the exterior cover of a device, if static electricity from the outside is introduced, the installed first holding member 4 or second holding member 5 is installed. Therefore, the liquid crystal drive circuit (not shown) is not destroyed.

[0035]

As described above, as in the present invention, the engaging claw portion formed in the first holding member and the engaging hole portion formed in the second holding member are engaged and pressure-welded. A second holding member for the flexible printed circuit board, in which the mold connector is maintained in a compressed state by a predetermined amount, and the engaging convex portion formed on the flexible printed circuit board is locked in the engaging hole portion of the second holding member. By configuring to prevent falling from
It is possible to realize a liquid crystal display device which has a simple shape and is compact, has good assembly workability, and has a small number of parts.

At least a part of the engaging claw portion and the engaging hole portion is vertical to the liquid crystal display surfaces of the first holding member and the second holding member, respectively, and 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 dimension that allows the first holding member and the second holding member to be positioned in the extending direction of the electrodes of the liquid crystal display section. With this configuration, it is possible to reduce rattling.

Further, by chamfering or rounding the corners of the tips of the engaging claws, the assembling workability can be further improved.

Further, the exposed ground pattern portion of the flexible printed circuit board is pressed against the second holding member by the compression reaction force of the pressure contact type connector, whereby the second holding member is grounded, and the engaging hole portion and the engaging claw are provided. By grounding the first holding member through the portion, it is possible to enhance the electrostatic resistance performance without adding any other member and without deteriorating the assembly workability.

[Brief description of 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 a method of assembling the liquid crystal display device.

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

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

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

[Explanation of symbols]

1 LCD display 1e Transparent electrode 2 Pressure contact type connector 3 Flexible printed circuit board 3a Liquid crystal drive signal pattern exposed portion 3b exposed ground pattern 3c engaging projection 4 First holding member 4a Engaging claw 5 Second holding member 5a Engagement hole

Claims (3)

(57) [Claims] 1. A liquid crystal display unit, a flexible printed circuit board, a pressure contact type connector, a first holding member and a second holding member, and an electrode of the liquid crystal display unit and a liquid crystal drive signal pattern exposed portion of the flexible printed circuit board. the pressure-contact type connector is interposed between, these in the first holding member from the liquid crystal display unit side, by compressing and clamped by the second holding member from the flexible printed circuit board side, guide
In the liquid crystal device, which is inserted and held, an engagement claw portion formed on the first holding member and the second engagement member so as to engage with each other at a position where the pressure contact type connector can be maintained in a compressed state of a predetermined amount. An engaging hole formed in a holding member, and an engaging hole formed in the flexible printed circuit board and engaged with the engaging hole of the second holding member to prevent the flexible printed circuit board from the second holding member. An engaging convex portion that prevents the falling off, and an outer dimension of the engaging claw portion and an outer dimension of the engaging hole portion that can be positioned with respect to each other in the alignment direction of the electrodes of the liquid crystal display portion when engaged. The outer dimensions of the engaging projections are set to such a size that they can be positioned in the alignment direction of the electrodes of the liquid crystal display unit with respect to the second holding member, and the outer dimensions of the first holding member and the second holding member are set. Both holding members are made of metal, etc.
While it is made of a conductive material, the flexible
The printed circuit board is a liquid crystal drive that contacts the pressure contact type connector.
Dynamic signal pattern exposed portion and the liquid crystal drive signal pattern
An electrically grounded ground on the back of the outlet
Exposed pattern part, and
The exposed part of the ground pattern is pressed by the repulsive force
The second holding member is grounded, and further the engaging hole portion and the engaging
The first holding member is grounded via the claw portion
A liquid crystal device, characterized in that the. 2. The engaging claw portion and the engaging hole portion are at least partly vertical to the liquid crystal display surfaces of the first holding member and the second holding member, respectively, and in the alignment direction of electrodes of the liquid crystal display portion. Is formed on at least two surfaces that are parallel to the first holding member and the second holding member, and the distance between the surfaces is set to a size that enables positioning of the first holding member and the second holding member in the extending direction of the electrodes of the liquid crystal display unit. The liquid crystal device according to claim 1, wherein the liquid crystal device is a liquid crystal device. 3. The liquid crystal device according to claim 1, wherein a corner portion of a tip of the engaging claw portion is chamfered or rounded.