JPH10274941A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the plane size of a liquid crystal display device provided with three shield cases. SOLUTION: The certain part of a first engaging projection 31 on the side wall 3a of an upper shield case 3 is fitted inside the side wall 2a of a middle shield case 2 and the certain part of a second engaging projection 32 on the side wall 3a of the upper shield case 3 is fitted inside the side wall 1a of a lower shield case 1. Thus, the side wall 2a of the middle shield case 2 and the side wall 1a of the lower shield case 1 are positioned on the same surface on the outer side of the side wall 3a of the upper shield case 3, and compared to the case of simply piling up the side walls 1a-3a of the three shield cases 1-3, the side wall of the entire shield cases is thinned and the plane size is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display device such as a liquid crystal display device.

[0002]

2. Description of the Related Art Conventional liquid crystal display devices include those shown in FIGS. 3 shows a plan view of the liquid crystal display device, FIG. 4 shows a cross-sectional view along line AA in FIG. 3, and FIG. 5 shows a perspective view of a part of the liquid crystal display device. This liquid crystal display device includes a lower shield case 1, a middle shield case 2, and an upper shield case 3 made of metal. In this case, an opening 4 is formed at a predetermined location of the middle shield case 2, and a display window 5 is formed at a predetermined location of the upper shield case 3. In the lower shield case 1, a backlight 6, a middle shield case 2, and a middle shield case 2
The liquid crystal display panel 7 attached above via a double-sided adhesive tape (not shown) is stored in this order. In this case, the side wall 2 a of the middle shield case 2 is fitted in the side wall 1 a of the lower shield case 1. Then, the side wall 1 a of the lower shield case 1 is fitted into the side wall 3 a of the upper shield case 3, and the engagement protrusion 8 formed on the side wall 1 a of the lower shield case 1 is formed on the side wall 3 a of the upper shield case 3. The upper and lower shield cases 3 and 1 are connected to each other by being engaged with the engagement holes 9.

In the liquid crystal display panel 7, a liquid crystal (not shown) is sealed between two transparent substrates 10 and 11 made of glass, resin or the like, and a polarizing plate is provided on each surface of the two transparent substrates 10 and 11 respectively. 12 and 13 are attached. In this case, the right side and the lower side of the lower transparent substrate 11 protrude from the upper transparent substrate 10, and semiconductor chips 14 and 15 made of LSI or the like are mounted at predetermined positions on the upper surface of these protruding portions. ing. Also, the lower transparent substrate 1
One end of the flexible printed circuit board 16 is connected to a predetermined location on the upper surface of the right side of 1. The other end of the flexible wiring board 16 has a notch 2b formed in the side wall 2a of the middle shield case 2, a notch 1b formed in the side wall 1a of the lower shield case 1, and a side wall 3a of the upper shield case 3.
And protrudes to the outside via a notch 3b formed at the bottom.

The backlight 6 includes a flat tube 17, a diffusion sheet 18 provided on the upper surface of the flat tube 17, a dimming sheet 19 provided on the upper surface of the diffusion sheet 18, and a flat tube 17.
And a reflection sheet 20 provided on the lower surface of the optical disc.
Among them, the flat tube 17 is provided with two transparent substrates 21 and 22 having phosphors (not shown) provided on opposing surfaces. The diffusion sheet 18 scatters light emitted from the upper surface of the flat tube 17,
This is to make the luminance uniform. Light control sheet 19
Is for condensing the light emitted from the upper surface of the diffusion sheet 18 upward.

[0005]

Here, the plane size of the above-mentioned liquid crystal display device will be described. As shown in FIG. 4, the plane size of the middle shield case 2 is selected according to the plane size of the liquid crystal display panel 7. Since the side wall 3a of the upper shield case 3 is arranged on the outside and the side wall 1a of the lower shield case 1 is arranged on the outside, the side wall of the entire device is relatively thick, and the plane size of the entire device is relatively large. There was a problem. In addition, there has been a problem that the weight of the entire apparatus also increases accordingly. Further, when the upper shield case 3 and the lower shield case 1 are connected to each other, the liquid crystal display panel 7 is entirely covered for the first time. Further, the protection of one end of the flexible wiring board 16 is not sufficient, and there is a problem that the liquid crystal display panel 7 needs to be handled with care until then. An object of the present invention is to reduce the planar size of the entire device, reduce the weight of the entire device, and cover the entire display panel before connecting the upper and lower cases to each other. It is to be.

[0006]

According to the present invention, there is provided a lower case, a middle case having an opening, an upper case having a display window, and a backlight housed between the lower case and the middle case. A display panel housed between the middle case and the upper case, and a predetermined part of a side wall of one of the upper case and the middle case is provided in a side wall of the other case. And a predetermined other portion of the side wall of the one case is fitted into the side wall of the lower case.

According to this invention, a predetermined part of the side wall of one of the upper case and the middle case is fitted into the side wall of the other case, and another predetermined part of the side wall of the one case is provided. Is fitted in the side wall of the lower case, so that the side wall of the other case and the side wall of the lower case are located on the same plane outside the side wall of the one case. Can be made thinner, and thus the planar size of the entire device can be reduced, and the weight of the entire device can be reduced. In addition, since the middle case and the upper case can be connected to each other, the display panel can be entirely covered with the middle case and the upper case before the upper and lower cases are connected to each other.

[0008]

FIG. 1 is a sectional view of a liquid crystal display device to which one embodiment of the present invention is applied, and FIG. 2 is an exploded perspective view of a part of the liquid crystal display device. In these drawings, the same reference numerals are given to the same parts as those in FIGS. 4 and 5, and the description thereof will be omitted as appropriate.

In this liquid crystal display device, the plane size of the lower shield case 1 is the conventional lower shield case 1 shown in FIG.
Is the same as the plane size. Medium shield case 2
Is larger than the plane size of the conventional middle shield case 2 shown in FIG. 4 by about twice the thickness of the side wall 2a, that is, substantially the same as the plane size of the lower shield case 1 shown in FIG. It has become. The plane size of the upper shield case 3 is the conventional upper shield case 3 shown in FIG.
Is approximately four times the thickness of the side wall 3a of the lower shield case 1 shown in FIG.
Is about twice as small as the thickness of the side wall 1a. In this embodiment, the thicknesses of the side walls 1a to 3a of the shield cases 1 to 3 are assumed to be the same.

At a plurality of predetermined locations on the side wall 3a of the upper shield case 3, first rectangular parallelepiped engaging projections 31 are provided, and at other predetermined multiple locations, second rectangular parallelepiped engaging projections 32 are provided. Is provided. In the side wall 2a of the middle shield case 2, a portion corresponding to the first engagement protrusion 31 is provided with a square engagement hole 33, and the second engagement protrusion 3
A rectangular notch 34 is provided in a portion corresponding to a certain portion 2. In the side wall 1a of the lower shield case 1, a rectangular engaging hole 35 is provided in a portion corresponding to the second engaging projection 32, and a rectangular notch is formed in a portion corresponding to the side wall 2a of the middle shield case 2. A part 36 is provided.

Then, a portion (predetermined part) of the side wall 3a of the upper shield case 3 where the first engagement protrusion 31 is provided is fitted into the side wall 2a of the middle shield case 2, and the first side of the upper shield case 3 Are engaged with the engagement holes 33 of the middle shield case 2. Thus, the upper shield case 3 and the middle shield case 2 are connected to each other.
In this case, the liquid crystal display panel 7 is stored between the upper shield case 3 and the middle shield case 2 in a state where the liquid crystal display panel 7 is stuck on the middle shield case 2 via a double-sided adhesive tape (not shown). Further, in a state where the side wall 2a of the middle shield case 2 is arranged in the cutout portion 36 of the lower shield case 1, a portion of the side wall 3a of the upper shield case 3 where the second engagement protrusion 32 is provided (predetermined other portion). Is the lower shield case 1
And the second engagement projection 32 of the upper shield case 3 is engaged with the engagement hole 35 of the lower shield case 1. Thus, the upper shield case 3 and the lower shield case 1 are connected to each other. In this case, the backlight 6 is housed between the middle shield case 2 and the lower shield case 1 as in the conventional case.

As described above, in this liquid crystal display device, the portion of the side wall 3a of the upper shield case 3 where the first engagement protrusion 31 is provided is fitted into the side wall 2a of the middle shield case 2 and the upper shield case 3 Of the side wall 3a of the lower shield case 1 is fitted into the side wall 1a of the lower shield case 1, so that the middle shield case 2 The side wall 2a and the side wall 1a of the lower shield case 1 are located. As a result, the side wall of the entire device can be made thinner, and the planar size of the entire device can be reduced. Here, as a specific example of the dimensions, when the thickness of the side walls 1a to 3a of each of the shield cases 1 to 3 is set to about 0.3 mm, the plane size of the entire device is different from the conventional case shown in FIG. In comparison, it can be reduced by about 0.6 mm. A notch 34 is provided in a portion of the side wall 2a of the middle shield case 2 corresponding to the portion where the second engagement protrusion 32 is provided, and a portion of the side wall 1a of the lower shield case 1 corresponding to the side wall 2a of the middle shield case 2 is provided. Since the notch 36 is provided in the
Together with the reduction in the planar size of the entire apparatus, the weight of the entire apparatus can be reduced. Further, since the middle shield case 2 and the upper shield case 3 can be connected to each other, before the upper and lower shield cases 3 and 1 are connected to each other, the entire liquid crystal display panel 7 is formed by the middle shield case 2 and the upper shield case 3. Can be covered. Therefore, in this way, before the upper shield case 3 and the lower shield case 1 are connected to each other, sufficient countermeasures against static electricity for the liquid crystal display panel 7 can be provided, and protection of one end of the flexible wiring board 16 can also be performed. Can be enough.

In the above-described embodiment, the engagement projections 31,
Although the case where 32 was formed in a rectangular parallelepiped shape was described,
The present invention is not limited to this, and may be formed in a substantially hemispherical shape. With this configuration, for example, when the first engagement protrusion 31 of the upper shield case 3 is engaged with the engagement hole 33 of the middle shield case 2, first, the side wall 2a of the middle shield case 2 is When the first engagement protrusion 31 is engaged with the engagement hole 33, the side wall 2a of the middle shield case 2 is moved by its own elasticity. You will return to nature by force. Therefore, the first engagement protrusion 31 of the upper shield case 3 can be engaged with the engagement hole 33 of the middle shield case 2 with one touch.

In the above embodiment, a predetermined part of the side wall 3a of the upper shield case 3 is fitted into the side wall 2a of the middle shield case 2 and the side wall 3a of the upper shield case 3
Has been described in the case where the predetermined other portion is fitted into the side wall 1a of the lower shield case 1, but the present invention is not limited to this, and a predetermined part of the side wall of the middle shield case is fitted in the side wall of the upper shield case. Alternatively, a predetermined other part of the side wall of the middle shield case may be fitted into the side wall of the lower shield case.

Further, the backlight 6 is not limited to the flat tube 17, but may be an edge light type or a direct type, or may be an EL (electroluminescence) panel.

[0016]

As described above, according to the present invention, a predetermined part of the side wall of one of the upper case and the middle case is fitted into the side wall of the other case, and Since the predetermined other portion of the side wall of the case is fitted into the side wall of the lower case, the side wall of the other case and the side wall of the lower case are located on the same surface outside the side wall of one case. As a result, the side wall of the entire device can be made thinner, so that the planar size of the entire device can be reduced, and the weight of the entire device can be reduced. In addition, since the middle case and the upper case can be connected to each other, the display panel can be entirely covered with the middle case and the upper case before the upper and lower cases are connected to each other. Therefore, in this way, before the upper case and the lower case are connected to each other, it is possible to sufficiently take measures against static electricity for the display panel.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a liquid crystal display device to which an embodiment of the present invention is applied.

FIG. 2 is an exploded perspective view showing a part of the liquid crystal display device.

FIG. 3 is a plan view showing a conventional liquid crystal display device.

FIG. 4 is a sectional view taken along the line AA in FIG. 3;

FIG. 5 is a perspective view showing a part of the liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower shield case 2 Medium shield case 3 Upper shield case 4 Opening 5 Display window 6 Backlight 7 Liquid crystal display panel

Claims (3)

[Claims] 1. A lower case, a middle case having an opening, an upper case having a display window, a backlight housed between the lower case and the middle case, the middle case and the upper case A display panel housed between the upper case and the middle case, a predetermined part of a side wall of one of the upper case and the middle case is fitted into a side wall of the other case,
And a predetermined other portion of the side wall of the one case is fitted into the side wall of the lower case. 2. An engagement projection provided on a predetermined portion of a side wall of the one case is engaged with an engagement hole provided on a side wall of the other case, and a predetermined portion of the side wall of the one case is provided. The display device according to claim 1, wherein an engagement protrusion provided on another portion of the first case is engaged with an engagement hole provided on a side wall of the lower case. 3. The display device according to claim 1, wherein the display panel is a liquid crystal display panel.