JP2000147469A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device with which the stabilization of quality and the improvement in productivity may be achieved. SOLUTION: A recess of a shape fitting in phase to a liquid crystal panel 20 is formed at an outside frame member 30, by which the positioning and temporary fixing of the liquid crystal panel 20 are carried out with the fitting work of the liquid crystal panel 20 into this recess. UV curing resins 13 are filled into filling parts 30c formed at the plural points of the peripheral walls 30d of the recess and are cured, by which the liquid crystal panel 20 is fixed within the recess. As a result, the mold packaging by a room temp. curing type silicone resin which is heretofore carried out may be abolished and the variation in the quality by the packing defect, etc., of these resins and the degradation in the productivity by the curing time of the resins may be ameliorated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device, and more particularly to a structure for fixing a liquid crystal panel and an outer frame member required for assembling to a device such as a viewfinder.

[0002]

2. Description of the Related Art A small and thin liquid crystal panel is used in a liquid crystal display device used for an optical instrument such as a viewfinder or a projector. FIG. 7 schematically shows the inside of the viewfinder 1 of the handy video camera. The liquid crystal panel 2 is, for example, 1.3 cm × 1.3 cm
And has a thickness of 0.5 cm, and is connected to a liquid crystal driving substrate 3 via a flexible printed circuit 4. The image displayed on the liquid crystal panel 2 is recognized by the operator via the optical lens 5. On the other hand, although schematically shown in FIG. 8, for example, a projector 6 that projects images displayed on each of the three liquid crystal panels 2 to the outside through a dichroic mirror 7 and an optical lens 8.
Is shown. The liquid crystal panel 2 is also connected to the above-mentioned liquid crystal driving substrate (not shown).

[0003] When a liquid crystal panel is assembled to the main body of a viewfinder or projector, FIG.
And an outer frame member 1 around the liquid crystal panel as shown in FIG.
0 is attached. The outer frame member 10 is made of a synthetic resin (for example, polycarbonate) and has a recess 10 a for accommodating the liquid crystal panel 20. An opening 16 is provided at a position corresponding to the display surface of the liquid crystal panel 20 at the bottom of the recess 10a.
Are formed. A plurality of projections 11 are formed on the upper surface of the outer frame member 10 to secure a constant gap between the outer frame member 10 and the driving device 3 (see FIG. 7). LCD panel 2
Reference numeral 0 denotes a known structure, in which a liquid crystal material is filled between two glass substrates provided with electrodes.
Has a polarizing plate 23 and a color filter (not shown), and the other glass substrate 22 has a TFT (Thin Film Transi
A flexible printed circuit 4 is formed on the pad by thermocompression bonding.

The outer frame member 10 and the liquid crystal panel 20 are fixed by mounting a room-temperature-curable silicone resin 12 in a mold. FIG. 6 shows the liquid crystal panel 20 on the outer frame member 10.
The liquid crystal panel 20 (FIG. 6A) provided with the flexible printed circuit 4 is connected to the concave portion 10 of the outer frame member 10.
a, the liquid crystal panel 20 and the peripheral wall 10 of the outer frame member 10.
After the acrylic UV curable resin 13 is dropped and temporarily fixed to the gap between the liquid crystal panel 20 and the liquid crystal panel 20 (FIG. 6B).
The room-temperature-curable silicone resin 12 is applied to the four sides to bond the liquid crystal panel 20 to the outer frame member 10 (FIG. 6).
C).

However, when the room-temperature-curable silicone resin 12 is applied, the gap between the liquid crystal panel 20 and the peripheral wall 10d of the outer frame member 10 is very small, about 1.5 mm.
In addition, since the dispenser nozzle (not shown) for discharging the resin is a line coating performed while moving along the four sides of the liquid crystal panel 20, a filling failure such as unfilled resin or overfilled resin occurs, or the silicone resin 12 There is a problem that the quality cannot be stabilized due to, for example, adhesion to the surface of the panel 20 or the outer frame member 10. In particular, since this kind of resin has a high viscosity, the resin easily pulls a thread when the dispenser nozzle moves upward after filling the resin, and this often causes the resin to adhere to the product.

[0006] Further, as a characteristic of the room-temperature-curable silicone resin, the curing condition is that it is left at room temperature for 24 hours or more, so that the lead time is long and the productivity is considerably adversely affected.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to stabilize quality and improve productivity by eliminating the use of a room-temperature-curable silicone resin when mounting a liquid crystal panel. It is an object of the present invention to provide a liquid crystal display device capable of performing the following.

[0008]

In order to solve the above-mentioned problems, the present invention forms a recess in the outer frame member having a shape to be fitted with a liquid crystal panel, and forms a plurality of recesses on the peripheral wall of the recess. An injection portion of an adhesive for fixing the liquid crystal panel is formed in the recess. That is, by forming a recess in the outer frame member having a shape that mates with the liquid crystal panel, positioning and temporary fixing of the liquid crystal panel are performed by fitting the liquid crystal panel into the recess. The liquid crystal panel is fixed in the recess by injecting an adhesive into injection portions formed at a plurality of locations on the peripheral wall. If an ultraviolet curable or thermosetting resin is used as the adhesive, no time is required for curing. Thereby, a liquid crystal panel can be mounted without using a room-temperature-curable silicone resin.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. The liquid crystal panel 20 is configured in the same manner as in the prior art, and is formed by filling a liquid crystal substance (not shown) between two glass substrates 21 and 22 with electrodes. One of the glass substrates 21 has a polarizing plate 23 and a color filter. The other glass substrate 22 is formed as a TFT (Thin Film Transistor) substrate, and the flexible printed circuit 4 is attached on its pad by thermocompression bonding.

The outer frame member 30 according to the present embodiment is made of a synthetic resin (for example, polycarbonate).
The recess 30a is formed in a shape that fits with the recess 30a. An opening 30b is formed at the bottom of the recess 30a at a position corresponding to the display surface of the liquid crystal panel 20 (see FIG. 3), and an adhesive injection portion 30c is formed at a plurality of locations on the peripheral wall 30d. . The liquid crystal panel 20 and the outer frame member 30 are integrated by filling and curing an acrylic ultraviolet curable resin 13 as an adhesive in the plurality of injection portions 30c. It is sufficient that the injection portion 30c is formed in such a shape that the resin 13 can be applied by spot application, and that the number of the injection portions 30c is sufficient to secure an adhesion area enough to fix the liquid crystal panel 20 to the outer frame member 30.

In the present embodiment, the recess 3 of the outer frame member 30
Just fit the liquid crystal panel 20 into the recess 30a.
a, the liquid crystal panel 20 can be positioned and temporarily fixed, and after the resin 13 is locally applied to the injection portion 30c, the resin 13 is cured by irradiating ultraviolet rays.
And the outer frame member 30 can be integrally fixed.

Therefore, according to the present embodiment, the step of applying the adhesive for temporarily fixing the liquid crystal panel 20 which has been conventionally performed can be omitted, and the room-temperature-curable silicone resin is applied along the four sides of the liquid crystal panel 20. The liquid crystal panel 20 can be mounted on the outer frame member 30 only by applying the ultraviolet curable resin 13 to the injection portion 30c instead of abolishing the work of performing the above, so that the quality can be stabilized and the yield can be improved. And productivity can be improved. In particular, since the mold mounting using the room-temperature-curable silicone resin can be eliminated, the cost can be significantly reduced by reducing the mounting material, and the productivity can be significantly improved by shortening the curing time of the resin.

Further, since the electric connection to the liquid crystal driving substrate is made through the flexible printed circuit 4 attached to the liquid crystal panel 20, the electric connection to the apparatus main body such as a viewfinder or a projector can be made. Strict position adjustment between the liquid crystal panel 20 and the liquid crystal driving substrate is not required.

The liquid crystal panel 20 and the outer frame member 30 integrated as described above are assembled to a device body such as a viewfinder or a projector, and the flexible printed circuit 4 is bent to drive the liquid crystal behind the flexible printed circuit. Connected to the substrate 3 (FIG. 7
reference). At this time, the liquid crystal panel 20 and the liquid crystal driving substrate 3
Are the projections 31 formed at three places on the upper surface of the outer frame member 30.
As a result, a predetermined gap is secured.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, in the above embodiment, the injection unit 30
Although the ultraviolet curable adhesive 13 is applied as the adhesive to be injected into c, the present invention is not limited to this, and a thermosetting resin, for example, may be applied.

The shape and size of the liquid crystal panel 20 are not limited to the above-described embodiment, but can be applied to various shapes and sizes.
a may be appropriately changed to a shape that fits with the liquid crystal panel. Also, if necessary, the outer frame member 30 may be provided (not shown).
A flange having a screw hole for inserting a screw for mounting the device body may be formed at an appropriate location on the outer periphery of the device.

[0019]

As described above, according to the liquid crystal display device of the present invention, the molding of the liquid crystal panel 20 using the room-temperature-curable silicone resin, which has been conventionally performed, can be eliminated, thereby stabilizing the quality and improving the yield. , The productivity can be improved, and further, the cost can be significantly reduced due to the reduction of the mounting material.

Further, the fixing between the liquid crystal panel and the outer frame member is performed by an ultraviolet curable resin which is cured by irradiation of ultraviolet rays, which can greatly contribute to improvement of productivity.

Further, according to the configuration of the third aspect, there is no strict position adjustment between the liquid crystal panel and the liquid crystal driving substrate when setting the liquid crystal panel on a device body such as a view finder or a projector.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is an overall perspective view of an outer frame member according to the present invention.

FIG. 4 is an overall perspective view showing a conventional example.

FIG. 5 is a sectional view of the same.

6A and 6B are perspective views showing a liquid crystal panel mounting process according to a conventional example, where A is a liquid crystal panel, B is a temporary fixing process between the liquid crystal panel and an outer frame member, and C is a room temperature curing resin application process. Is shown.

FIG. 7 is a schematic diagram showing an example of attaching a liquid crystal panel to a device.

FIG. 8 is a schematic view showing another example.

[Explanation of symbols]

1. Viewfinder 3. Liquid crystal driving substrate
4 ... flexible printed circuit, 6 ... projector, 13
...... UV curable resin (adhesive), 20 ... liquid crystal panel, 30 ... outer frame member, 30a ... recess, 30b
... opening, 30c ... injection part, 30d ... peripheral wall part.

Claims (3)

[Claims] 1. A liquid crystal display device comprising: a liquid crystal panel; a liquid crystal driving substrate; and an outer frame member fixed around the liquid crystal panel for attaching the liquid crystal panel to an apparatus body. A liquid crystal, wherein a recess having a fitting shape is formed in the outer frame member, and an injection portion of an adhesive for fixing the liquid crystal panel in the recess is formed at a plurality of locations on a peripheral wall of the recess. Display device. 2. The liquid crystal display device according to claim 1, wherein the adhesive is an ultraviolet curable resin. 3. The liquid crystal display device according to claim 1, wherein the liquid crystal panel is provided with a flexible printed circuit connected to the liquid crystal driving substrate.