JP3486530B2 - 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". In most cases, this liquid crystal display device is arranged just inside the window formed on the exterior cover.

Here, in the case where a window member is attached to the exterior member to form an exterior cover, static electricity outside the device enters even if the gap between the window member and the exterior member is very small. It is generally known that an electric circuit of a device is reached, causing malfunction of the device and destruction of electric parts.

Therefore, in order to prevent such malfunctions and damages in the related art, various static electricity countermeasures are incorporated in a liquid crystal display device which is constituted by a holding member having conductivity such as metal.

FIG. 5 is a cross-sectional view of a liquid crystal display device against static electricity as the first conventional example. In such a liquid crystal display device, the outer shape of the liquid crystal display unit 11 is enlarged and the exterior member 16 and the window member 17 are used. A sufficient distance L3 in the horizontal direction from the gap between the first holding member 14 and the first holding member 14 is secured so that static electricity does not fly.

FIG. 6 is a cross-sectional view of a liquid crystal display device against static electricity as the second conventional example. In such a liquid crystal display device, the liquid crystal display portion 21 is arranged at a recessed position and an exterior member 26 is provided. The distance L4 from the outer surface of the window member 27 to the surface of the first holding member 24 is sufficiently secured to prevent static electricity from flying.

FIG. 7 shows a conventional example 3 proposed in Japanese Utility Model Laid-Open No. 58-31188, in which positive static electricity countermeasures are taken. That is, the claw portion 34 of the holding member 34
a and the ground pattern 33a on the back surface of the printed circuit board 33
The holding member 34 is grounded by making contact with and to have electrostatic resistance.

FIG. 8 shows a conventional example 4 proposed in Japanese Utility Model Publication No. 8-007387, in which active static electricity countermeasures are taken. That is, the liquid crystal display device in which the liquid crystal display unit 41 is connected to the flexible printed circuit board 43 by the holding member 44 is brought into contact with the grounding member 48 to be grounded when it is incorporated into a device, so as to have electrostatic resistance. Is.

[0009]

However, each of the above conventional examples has the following problems.

That is, in Conventional Example 1, the liquid crystal display unit 1
The cost is increased by increasing 1 and
This leads to an increase in the size of equipment. Further, in the conventional example 2, although the cost of the liquid crystal display unit 21 can be suppressed, the liquid crystal display unit 21 is recessed so that a dead space is generated and the size of the device is increased, and the visibility of the display is visible. Becomes worse.

Further, in the conventional example 3, although the above-mentioned drawbacks are eliminated, a jig or a habit is required for the work of engaging the holding member 34 and the printed board 33, and the board is thin and flexible. It cannot be applied when a high flexible printed circuit board is used. Further, in the conventional example 4, although the above-mentioned drawbacks are eliminated, it is necessary to previously arrange the grounding member 48 for grounding the holding member 44, which also leads to an increase in size of the device.

The present invention has been made in view of the above problems.
It is a first object of the present invention to provide a liquid crystal device having a high static resistance performance with a simple structure without increasing the number of parts. A second object of the present invention is to provide a liquid crystal device capable of improving assembling workability and simplifying / compacting the shape of parts.

[0013]

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 which is electrically connected and held by sandwiching the flexible printed circuit board, at least a second holding member of the two holding members is made of a conductive material, and the flexible printed circuit board is connected to the pressure contact type connector. a liquid crystal drive signal pattern exposed portion abutting, which has a ground pattern exposure portion where the is grounded electrically provided on the back side of the liquid crystal drive signal pattern exposed portion, said compression及
And the ground pattern exposed portion is pressed against the second holding member by the compression reaction force of the sandwiched pressure contact type connector to ground the second holding member. .

According to the present invention, the first holding member has an engaging claw portion and the second holding member has an engaging hole portion, and the engaging claw portion and the engaging hole portion are interposed therebetween. The first holding member and the second holding member are engaged with each other at an interval capable of maintaining the pressure contact type connector in a compressed state of a predetermined amount.

Further, according to the present invention, the engaging claw portion and the engaging hole portion also serve as mutual positioning means for the first holding member and the second holding member in a direction parallel to the liquid crystal display surface. It is a feature.

Further, the present invention is characterized in that the engaging hole portion of the second holding member serves also as a positioning and holding means for the flexible printed circuit board.

The present invention also provides the first holding member,
It is characterized in that a claw portion for positioning or guiding the liquid crystal display portion and the pressure contact type connector is formed.

Further, the present invention is characterized in that the ground pattern exposed portions are formed at the same pitch and in the same phase as the liquid crystal drive signal pattern exposed portions.

Further, as in the present invention, the second holding member is made of a conductive material, and the ground pattern is electrically grounded provided on the back side of the liquid crystal drive signal pattern exposed portion of the flexible printed circuit board. The second holding member is grounded by pressing the exposed portion against the second holding member by the compression reaction force of the pressure contact type connector. In addition, the first holding member and the second holding member are connected to each other with a predetermined amount of the pressure contact type connector by the engaging claw portion formed in the first holding member and the engaging hole portion formed in the second holding member. Engage with each other at intervals that can be maintained in compression.

[0020]

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 circuit board 3 are provided. It is sandwiched between the liquid crystal drive signal pattern exposed portion 3a of FIG. Therefore, it is possible to correctly connect the liquid crystal drive pattern exposed portion 3a and the transparent electrode 1e 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 member (not shown). A partially exposed liquid crystal drive signal pattern exposed portion 3a is formed, and directly behind the liquid crystal drive signal pattern exposed portion 3a is electrically connected by an appropriate method (not shown) such as connecting to a negative electrode of a battery. It has a ground pattern exposed portion 3b that is grounded.

The exposed ground pattern 3b
Is shown in FIG. 3 described later. Further, 3c is a positioning projection used for positioning with the second holding member 5, and the positioning projection 3c is the liquid crystal drive signal pattern exposed portion 3a.
It is also the standard for the pattern position of.

By the way, of the first holding member 4 and the second holding member 5, at least the second holding member 5 and in the present embodiment, the first holding member 4 is also formed by press forming a metal plate. The bent portion 4b is formed at the side end of the first holding member 4, 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 side end of the second holding member 5, and an engaging hole portion 5a is formed in this bent portion 5b. Further, the bent portion 5b spreads near the tip of one bent portion 5b. A shaped introduction portion 5c is formed.

Here, the engaging claw portion 4a and the engaging hole portion 5a.
By setting the dimensions L1 and L2 in the figure to be substantially the same, the symbol also has a function as positioning means in a direction parallel to the liquid crystal display surface. With this configuration, it is not necessary to form an independent positioning, the workability of assembling the first and second holding members 4 and 5 is improved, and at the same time, the shape is simplified and made compact. it can.

The distance between the first holding member 4 and the second holding member 5 when the engaging claw portion 4a and the engaging hole portion 5a are engaged is determined by the liquid crystal display portion 1 and the flexible printed circuit board 3. The pressure contact type connector 2 between the two is set at an interval for compressing a predetermined amount.

On the other hand, the engaging claw portion 4 a of the first holding member 4
Claws 4c and 4d for position regulation and guide are formed on the outer side of, and these claws 4c and 4d regulate the position and guide the liquid crystal display unit 1 and the pressure contact type connector 2, respectively. By forming the position regulating claws 4c and 4d, it is not necessary to use a jig or the like to install the liquid crystal display unit 1 and the pressure contact type connector 2, and the liquid crystal display unit 1 and the pressure contact type connector 2 can be installed. Thus, the workability of assembling the first holding member 4 can be improved.

The engaging hole 5a formed in the second holding member 5 also functions as a positioning / holding means for positioning / holding the flexible printed board 3 by engaging with the positioning protrusion 3c of the flexible printed board 3. I also have. With this configuration, it is not necessary to form an independent positioning or holding portion, and the workability of assembling the second holding member 5 and the flexible printed circuit board 3 is improved, and at the same time, the shape is simplified and compact. Can be achieved.

Next, the assembling of each of the above crystal parts will be described with reference to FIGS. Note that each reference sign is based on FIG.

First, as shown in FIG. 2 (a), the first holding member 4 is turned upside down, and the liquid crystal display unit 1 is installed by abutting against the claw portion 4c. Next, the pressure contact type connector 2 is installed using the claw portion 4d and the step between the upper glass 1a and the lower glass 1b as a guide. On the other hand, as shown in FIG.
The flexible printed circuit board 3 is attached to the holding member 5 of the above, and at this time, the positioning protrusion 3c of the flexible printed circuit board 3 is fitted into the engaging hole portion 5a so as to be positioned and held.

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 when the pressing is further pressed, the engaging claw 4a is moved into the engaging hole 5a.
Get stuck. Here, in this way, the first holding member 4 and the second holding member 5 are connected to the engaging claw portion 4a and the engaging hole portion 5a.
With this, it is possible to engage without using screws or other pressing members, so that the workability of assembling the first and second holding members 4 and 5 can be improved.

FIG. 4 shows a cross section of the liquid crystal display device described above after assembly. After assembly, the pressure contact type connector 2 engages the first holding member 4 and the second holding member 5. Is compressed by a predetermined amount.

On the other hand, as described above, the liquid crystal display unit 1 is positioned on the first holding member 4, the flexible printed circuit board 3 is positioned on the second holding member 5, and the first holding member 4 and the second holding member 4 are positioned. Since the holding member 5 is also positioned, each of the transparent electrodes 1e of the liquid crystal display portion 1 and each pattern of the liquid crystal drive signal pattern exposed portion 3a of the flexible printed board 3 are correctly connected.

Further, the ground pattern exposed portion 3b of the flexible printed circuit board 3 is pressed against the second holding member 5 by the compression reaction force of the pressure contact type connector 2, whereby the second structure can be simply structured without increasing the number of parts. The holding member 5 is grounded, and the electrostatic resistance performance can be improved.

On the other hand, also 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 by the compression reaction force of the pressure contact type connector 2. As a result, the first holding member 4 is also grounded.

At this time, the ground pattern exposed portion 3
Since b is formed in parallel with the liquid crystal drive signal pattern exposed portion 3a at the same pitch and in the same phase, the flexible printed circuit board 3 has a thin gap portion between the pattern exposed portions 3a and 3b and a thick pattern portion. There is. Therefore, the compression reaction force of the pressure contact type connector 2 is applied more strongly to the pattern portion than to the gap portion, and the liquid crystal drive signal pattern exposed portion 3a and the transparent electrode 1e, the ground pattern exposed portion 3b and the second holding member 5 are connected. Are connected more reliably.

[0041]

As described above, according to the present invention, the ground pattern exposed portion provided on the back side of the liquid crystal drive signal pattern exposed portion of the flexible printed circuit board is compressed by the compression reaction force of the pressure contact type connector. The second holding member is pressed against the second
By grounding the holding member, it is possible to realize a liquid crystal display device having a high static resistance performance with a simple configuration without increasing the number of parts.

Further, the first holding member and the second holding member can be engaged with each other by the engaging claw portion and the engaging hole portion at an interval capable of maintaining the pressure contact type connector in a compressed state of a predetermined amount. Therefore, the workability of assembling the first and second holding members can be improved.

Further, the engaging claw portion and the engaging engaging hole portion also serve to position the first holding member and the second holding member with respect to each other in the direction parallel to the liquid crystal display surface. The workability of assembling the first and second holding members can be further improved, and at the same time, simplification and compactness of the shape can be achieved.

Further, since the engaging hole formed in the second holding member also serves as the positioning of the flexible printed circuit board, the workability of assembling the second holding member and the flexible printed circuit board is improved, and at the same time, The shape can be simplified and made compact.

Further, the first holding member includes a liquid crystal display unit and
Since the claw portion for positioning or guiding the pressure contact type connector is formed, the workability of assembling the liquid crystal display part, the pressure contact type connector and the first holding member can be improved.

Further, since the ground pattern exposed portions of the flexible printed circuit board are formed at the same pitch and in the same phase as the liquid crystal drive signal pattern exposed portions, the second holding member can be grounded more reliably.

[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 a structure of a liquid crystal display device of Conventional Example 1.

FIG. 6 is a cross-sectional view showing the structure of a liquid crystal display device of Conventional Example 2.

FIG. 7 is a cross-sectional view showing the structure of a liquid crystal display device of Conventional Example 3.

FIG. 8 is a cross-sectional view showing the structure of a liquid crystal display device of Conventional Example 4.

[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 4c, 4d claws 5 Second holding member 5a Engagement hole

Claims (6)

(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
A liquid crystal device including a liquid crystal drive signal pattern, wherein at least a second holding member of the two holding members is formed of a conductive material, and the flexible printed circuit board is in contact with the pressure contact type connector. The ground pattern includes an exposed portion and an electrically grounded ground pattern exposed portion provided on the back side of the liquid crystal drive signal pattern exposed portion, and the ground pattern is formed by the compression reaction force of the compressed and clamped pressure contact type connector. A liquid crystal device, characterized in that the exposed part is pressed against the second holding member to ground the second holding member. 2. The first holding member has an engaging claw portion, and the second holding member has an engaging hole portion, and the first holding member has the engaging claw portion and the engaging hole portion. 1 holding member and 2nd
2. The liquid crystal device according to claim 1, wherein the holding members engage with each other at an interval capable of maintaining the press-contact type connector in a compressed state of a predetermined amount. 3. The engaging claw portion and the engaging hole portion also serve as mutual positioning means for the first holding member and the second holding member in the direction parallel to the liquid crystal display surface. The liquid crystal device according to claim 2. 4. The liquid crystal device according to claim 2, wherein the engagement hole portion of the second holding member also serves as a positioning and holding means for the flexible printed circuit board. 5. The liquid crystal device according to claim 1, wherein the first holding member is provided with a claw portion for positioning or guiding the liquid crystal display portion and the pressure contact type connector. 6. The liquid crystal device according to claim 1, wherein the exposed portions of the ground pattern are formed at the same pitch and in the same phase as the exposed portions of the liquid crystal drive signal pattern.