JPH10142584A - Liquid crystal dispiay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the liquid crystal display panel itself with mounting holes and to form the liquid crystal display panel in such a manner that the panel itself is capable of exhibiting a shielding effect. SOLUTION: A lower polarizing plate 14 slightly larger than a lower glass substrate 12 is mounted at the rear surface of this lower glass substrate 12. A lower ITO film 22 is formed over the entire of the rear surface of this lower polarizing plate 14. In such a case, respective both ends of the lower polarizing plate 14 and lower ITO film 22 respectively projected from the top and bottom sides of the lower glass substrate 12 are provided with the mounting holes 21, 24. An upper polarizing plate 15 of the same size as that of the lower glass substrate 12 is stuck to the front surface of an upper glass substrate 13. The upper ITO film 23 is stuck to the entire part of the front surface of the upper polarizing plate 15. In such a case, the upper polarizing plate 15 and the ITO film 23 are so arranged as to completely cover the front surface side of the lower glass substrate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art Conventional liquid crystal display devices include those shown in FIGS. 5 shows a plan view of the liquid crystal display device, and FIG. 6 shows the upper shield case 3 in FIG.
FIG. 7 is a plan view showing a state in which is removed, and FIG.
FIG. 3 shows a sectional view along the line. This liquid crystal display device includes a shield case in which a side wall 2 of a lower shield case 1 made of metal is fitted into a side wall 4 of an upper shield case 3 made of metal and is connected to each other by a hook (not shown). Openings 5 and 6 are provided at predetermined positions corresponding to the two shield cases 1 and 3. Further, mounting pieces 8 each having a mounting hole 7 are provided at predetermined two locations on each of two opposing predetermined side walls 4 of the upper shield case 3. A liquid crystal display panel 11 is housed in the shield cases 1 and 3 by being adhered to the inner surface of the lower shield case 1 via a double-sided adhesive tape (not shown). The liquid crystal display panel 11 has a structure in which polarizing plates 14 and 15 are attached to respective surfaces of a pair of glass substrates 12 and 13 constituting a liquid crystal cell.
In this case, the right side portion and the lower side portion of the lower glass substrate 12 in FIG. 6 protrude from the upper glass substrate 13, and a semiconductor chip 16 made of an LSI or the like is mounted on each predetermined portion of the upper surface of these protruding portions. Further, one end of a flexible wiring board 17 is connected to a predetermined portion of the upper surface of the lower glass substrate 12 on the right side in FIG. This liquid crystal display device is not shown, but the upper shield case 3
Are attached to the equipment case by screws inserted into the four mounting holes 7.

[0003]

However, in such a conventional liquid crystal display device, the mounting of the liquid crystal display panel 11 on an equipment case is not performed.
Is adhered to the inner surface of the lower shield case 1 via a double-sided adhesive tape, and is attached to the equipment case by screws inserted into the mounting holes 7 of the lower shield case 1. Therefore, even if the screws are removed, the double-sided adhesive tape and Lower shield case 1
, And there is a problem that the number of parts is large and the cost is high. Further, with respect to the shielding effect, a pair of metal shielding cases 1 and 2 is required, and there is a problem that the number of parts is large and the cost is high. An object of the present invention is to reduce the number of parts.

[0004]

According to the first aspect of the present invention,
In a liquid crystal display device in which a polarizing plate is attached to each surface of two transparent substrates constituting a liquid crystal cell, the size of at least one of the two polarizing plates is larger than the size of the liquid crystal cell. In one of the polarizing plates, a mounting hole is provided at a predetermined portion of a portion protruding from the liquid crystal cell. According to a third aspect of the present invention, in a liquid crystal display device in which a polarizing plate is attached to each surface of two transparent substrates constituting a liquid crystal cell, at least one of at least one of the two polarizing plates. Is provided with a transparent conductive film over substantially the entire surface.

According to the first aspect of the present invention, when mounting to the equipment case, a screw may be inserted into the mounting hole of the polarizing plate, and the screw may be mounted to the equipment case. No other parts are required, and the number of parts can be reduced. According to the third aspect of the present invention, the shielding effect can be exhibited by the transparent conductive film provided on the polarizing plate. Therefore, a component dedicated to shielding is not required, and the number of components can be reduced.

[0006]

FIG. 1 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention. In this figure, the same reference numerals are given to the same parts as those in FIGS. 5 to 7, and the description thereof will be appropriately omitted. In this liquid crystal display device, a pair of glass substrates (transparent substrates) constituting a liquid crystal cell
12 and 13 in that the upper polarizing plate 15 is attached to the display area on the upper surface of the upper glass substrate 13.
This is the same as the conventional case shown in FIG. However, the lower polarizing plate 14 attached to the lower surface of the lower glass substrate 12
7 is different from the conventional case shown in FIG. That is, in FIG. 1, the size of the lower polarizing plate 14 in the left-right direction is the same as the size of the lower glass substrate 12 (that is, the liquid crystal cell) in the same direction, and the size of the lower polarizing plate 14 in the vertical direction is the lower glass substrate. 12 is larger than the size in the same direction by a predetermined dimension. The lower polarizing plate 14 is attached to the lower surface of the lower glass substrate 12 with its upper and lower portions projecting equally from the upper and lower sides of the lower glass substrate 12, respectively. Further, mounting holes 21 are provided at both ends of the lower polarizing plate 14 protruding from the upper and lower sides of the lower glass substrate 12, respectively.

Therefore, when the liquid crystal display device is mounted on an equipment case (not shown), screws (not shown) inserted into the four mounting holes 21 of the lower polarizing plate 14 are provided on the equipment case. When screwed into the screw hole, this liquid crystal display device is attached to the device case. In this case, since other components other than the screw are not required, the number of components can be reduced, and the cost can be reduced.

FIG. 2 is a perspective view of a liquid crystal display device according to a second embodiment of the present invention. In this liquid crystal display device, a lower polarizing plate 14 having the same size as the lower glass substrate 12 is attached to the lower surface of the lower glass substrate 12,
Lower ITO film (lower transparent conductive film) on the entire lower surface of lower polarizing plate 14
22 are provided. An upper polarizing plate 15 having the same size as the upper glass substrate 13 is attached to the upper surface of the upper glass substrate 13, and an upper ITO film (upper transparent conductive film) 23 is provided on the entire upper surface of the upper polarizing plate 15. ing.

Therefore, in this liquid crystal display device, a shielding effect can be exerted by the ITO films 22 and 23 provided on both the polarizing plates 14 and 15, and therefore, a component dedicated to shielding is not required, and the number of components is reduced. And cost reduction can be achieved.

FIG. 3 is a perspective view of a liquid crystal display device according to a third embodiment of the present invention. In this liquid crystal display device, a lower polarizing plate 14 larger than the lower glass substrate 12 is attached to the lower surface of the lower glass substrate 12, and the lower ITO film 22 is provided on the entire lower surface of the lower polarizing plate 14. In this case, mounting holes 21 and 24 are provided at both ends of the lower polarizing plate 14 and the lower ITO film 22 which protrude from the upper and lower sides of the lower glass substrate 12, respectively. An upper polarizing plate 15 having the same size as the upper glass substrate 13 is attached to the upper surface of the upper glass substrate 13, and an upper ITO film 23 is provided on the entire upper surface of the upper polarizing plate 15.

Therefore, when this liquid crystal display device is mounted on an equipment case (not shown), screws (not shown) inserted into the four mounting holes 21 and 24 of the lower polarizing plate 14 and the lower ITO film 22 are used. When the liquid crystal display device is screwed into a screw hole provided in the device case, the liquid crystal display device is attached to the device case. Also in this case, no other parts other than screws are required, so that the number of parts can be reduced,
As a result, costs can be reduced. Also, in this liquid crystal display device, the I
The shielding effect can be exerted by the TO films 22 and 23, and therefore, there is no need for a dedicated component for shielding.
The number of parts can be reduced, and the cost can be reduced.

FIG. 4 is a perspective view of a liquid crystal display device according to a fourth embodiment of the present invention. This liquid crystal display device is different from the third embodiment shown in FIG. 3 in that an upper polarizing plate 15 having the same size as the lower glass substrate 12 is attached to the upper surface of the upper glass substrate 13.
Is that an upper ITO film 23 is provided on the entire upper surface of the substrate. In this case, the upper polarizing plate 15 and the upper ITO film 23 are arranged so as to completely cover the upper surface side of the lower glass substrate 12. Therefore, in this case, the portion on which the semiconductor chip 16 is mounted can be shielded by the upper ITO film 23. Note that the size of the upper polarizing plate 15 may be larger than the size of the lower glass substrate 12. At this time,
Lower polarizing plate 14 and lower ITO film 22 by upper polarizing plate 15
When the mounting holes 21 and 24 are covered, the upper polarizing plate 15
May be provided with a hole or notch through which the head of the screw is inserted.

In the first, third, and fourth embodiments, the case where the lower polarizing plate 14 is made larger than the liquid crystal cell and the mounting hole 21 is provided in the lower polarizing plate 14 is described. The polarizing plate 15 may be made larger than the liquid crystal cell and provided with a mounting hole. In addition, the second and third
In the fourth embodiment, the surface of the polarizing plates 14 and 15 is
Although the case where the O films 22 and 23 are provided has been described, the present invention is not limited to this, and an ITO film may be provided only on the back surfaces of the polarizing plates 14 and 15 or on both surfaces. In addition, the upper polarizing plate 1
5 may be provided with an ITO film only on the upper surface. Further, for example, with reference to FIG.
An ITO film is provided on the entire lower surface of the
Without providing the TO film, the side wall of the upper shield case, which is smaller by a predetermined dimension than the upper shield case having no mounting piece 8 in the upper shield case 3 shown in FIGS. By pressing against the side surface of the substrate 12, the upper shield case may be used.
Even in this case, since the lower shield case and the double-sided adhesive tape are not used, the number of components can be reduced.

[0014]

As described above, according to the first aspect of the present invention, when attaching to a device case, a screw may be inserted into the mounting hole of the polarizing plate and the screw may be attached to the device case. No components other than screws are required for attachment to the case, the number of components can be reduced, and the cost can be reduced. According to the third aspect of the present invention, the shielding effect can be exhibited by the transparent conductive film provided on the polarizing plate. Therefore, a component dedicated to shielding is not required, the number of components can be reduced, and the cost can be reduced. Down can be planned.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 4 is a perspective view of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 5 is a plan view of a conventional liquid crystal display device.

FIG. 6 is a plan view of FIG. 5 with the upper shield case removed.

FIG. 7 is a sectional view taken along the line AA of FIG. 5;

[Explanation of symbols]

 12 lower glass substrate 13 upper glass substrate 14 lower polarizing plate 15 upper polarizing plate 21 mounting hole 22 lower ITO film 23 upper ITO film 24 mounting hole

Claims (4)

[Claims] 1. A liquid crystal display device in which a polarizing plate is attached to each surface of two transparent substrates constituting a liquid crystal cell,
The size of at least one of the two polarizing plates is larger than the size of the liquid crystal cell, and a mounting hole is provided at a predetermined portion of a portion of the one polarizing plate protruding from the liquid crystal cell. A liquid crystal display device comprising: 2. A liquid crystal display according to claim 1, wherein a transparent conductive film is provided on substantially at least one surface of at least one of the two polarizing plates. apparatus. 3. A liquid crystal display device in which a polarizing plate is attached to each surface of two transparent substrates constituting a liquid crystal cell,
A liquid crystal display device, wherein a transparent conductive film is provided on substantially at least one surface of at least one of the two polarizing plates. 4. The invention according to claim 3, wherein the size of at least one of the two polarizing plates is larger than the size of the liquid crystal cell, and the one polarizing plate protrudes from the liquid crystal cell. A liquid crystal display device, wherein a mounting hole is provided at a predetermined portion of the portion where the liquid crystal display is provided.