JP3150235B2 - Display 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 display device such as a transmissive liquid crystal display device using a fluorescent lamp as a back light source, for example, used in a desktop word processor.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing a display device 41 having a first conventional technique. The display device 41 is, for example, a liquid crystal display device used for a display portion of a desktop word processor. The display device 41 includes a liquid crystal panel 44 in which liquid crystal (not shown) is sealed between an upper substrate 42 and a lower substrate 43, a protection plate 45 for protecting the liquid crystal panel 44, and a liquid crystal panel 44 sandwiched therebetween. Rarely, a spacer 46 made of rubber or the like is provided.

The liquid crystal panel 44 and the protection plate 45 are fixed to each other with fastening parts such as screws, or have the same function as the spacer 46, for example, are directly adhered and fixed with a double-sided tape. Alternatively, a protection plate 45 formed with a step corresponding to the spacer 46 is directly attached to and fixed to the liquid crystal panel 44. Thus, by forming the space 47 between the liquid crystal panel 44 and the protection plate 45, the stress applied to the protection plate 45 does not directly reach the liquid crystal panel 44,
Damage can be prevented.

However, although the spacer 46 is provided so as to surround the display area 49 of the liquid crystal panel 44, a gap may be formed, and a foreign substance 48 such as dust enters the space 47, and the display is not displayed. May cause trouble.

In the prior art, as a countermeasure for the above-described foreign matter,
The work of attaching the protection plate 45 to the liquid crystal panel 44 is performed in a clean environment so that foreign matter 48 does not enter the space 47.

A second prior art is disclosed in Japanese Patent Laid-Open Publication No. 1-115249.
1. FIG. 7 is a sectional view showing a display device 51 having the second conventional technique. A frame 58 attached to the liquid crystal panel 52 so as to surround the four sides is provided with a slit 59 on one side 60 and is made of an elastic member such as a sponge-like body. And the light source 53
Is inserted behind the liquid crystal panel 52 from the slit 59, dust adhered to the surface of the light source 53 is wiped off, and a clean light source 53 is assembled to the liquid crystal panel 52.

In this way, even if dust or the like adheres to the light source body, the light source body to which no dust or the like adheres can be assembled to the liquid crystal panel without special cleaning work.

[0008]

As described above, in the display device 41 of the first prior art, the countermeasures against foreign matter relate to the method and environment of the assembling work, and no structural solution has been established. . That is, for example, the protection plate 45
Immediately before the mounting operation of the liquid crystal panel 44 on the liquid crystal panel 44, the compressed air with static elimination is blown onto the liquid crystal panel 44 and the protection plate 45 to remove the foreign matter 48. However, as described above, since the space 47 is not a completely sealed space, foreign matter 48 may enter the gap or may remain due to insufficient foreign matter removal work.

When a foreign substance in the display area 49 that has entered during the assembly is found by visual inspection immediately after the mounting of the protective plate 45, the foreign substance 48 is removed by removing the protective plate 45 once attached. In addition, the work of attaching the protection plate 45 must be performed again, which significantly reduces the work efficiency and increases the cost.

Further, foreign substances existing outside the display area 49 are extremely difficult to find visually, and may move into the display area 49 after the product is shipped.
It may be raised as a quality issue at the time of shipment, but no complete prevention measures have been taken.

Similarly, with respect to the display device 51 of the second prior art, if foreign matter has already adhered to the liquid crystal panel 52 at the time of assembly, even if the light source body 53 is cleaned and installed by the slit 59, the effect is small. It is necessary to arrange work methods and environment.

[0012] It is an object of the present invention to provide a liquid crystal panel and at least one of a protection plate and a backlight illumination device, wherein foreign matter undesirably entering a space formed by the liquid crystal panel,
An object of the present invention is to provide a display device having a structure that does not appear in a display area of a liquid crystal panel.

[0013]

According to the present invention, there is provided a display device in which at least one of a protection plate and a backlight illuminating device is assembled to a display panel via an intervening member, wherein the intervening member is a display panel. And a display area surrounding the display area, and at least a side surface of the display panel on the display area side has adhesiveness.

[0014]

According to the present invention, in a display device provided with at least one of a protective plate provided on the front side of a display panel realized by a liquid crystal panel or the like and a backlight illumination device provided on the back side. The display panel and the intervening member interposed between the protection plate or the backlight illumination device surround the display area of the liquid crystal panel, and at least the display area side surface of the display panel has adhesiveness. It is formed. That is, for example, the intervening member is formed by applying an adhesive member to an outer peripheral surface of an elastic member such as rubber.

Therefore, the foreign matter once adhered to the adhesive member does not appear in the display area, and it is possible to prevent the visibility of the display area from deteriorating and to prevent the illumination from the backlight illumination device from being uneven.

[0016]

1 is a sectional view of a liquid crystal display device 1 according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the liquid crystal display device 1. The liquid crystal panel 4 used in the liquid crystal display device 1 is generally configured by sealing liquid crystal (not shown) between the lower substrate 2 and the upper substrate 3 and faces the liquid crystal of the substrates 2 and 3. Electrodes and switching elements are formed on the surface, and a desired display can be performed by selectively applying a drive voltage to the electrodes by a drive circuit (not shown).

On the front side of the upper substrate 3, a spacer 7, which is an interposed member formed by surrounding the elastic member 5 with an adhesive member 6, is interposed, and a protective plate 9 is mounted on the spacer 7. The space 8 formed by being surrounded by the upper substrate 3, the protection plate 9, and the spacer 7 prevents the liquid crystal panel 4 from being damaged by the stress applied to the protection plate 9 being directly transmitted to the liquid crystal panel 4. .

In the manufacturing process of the liquid crystal display device 1 configured as described above, the spacers 7 arranged so as to surround the display area 10 of the liquid crystal panel 4 are interrupted at the corners and the gaps 11 are formed. May be formed. Accordingly, as shown in FIG. 3, foreign matter 12 such as dust enters the space 8 from these gaps 11, and the space 8
In the display area 10, the visibility of the liquid crystal display may be deteriorated.

Therefore, in the present embodiment, the display area 10 is surrounded and the spacer 7 as an intervening member is constituted by the elastic member 5 and the adhesive member 6 as described above.
Since it is arranged so as to face at least the display area 10, the foreign matter 12 adheres to the adhesive member 6 as shown in FIG.

FIG. 4 is a sectional view of an electronic apparatus 21 using the liquid crystal display device 1 shown in FIGS. The electronic device 21 has a structure in which a backlight illumination device 22 is added to the surface of the liquid crystal display device 1 opposite to the protective plate 9, and is attached to a frame 23 together with the liquid crystal display device 1 with screws 24 or the like. For example, a desktop word processor. A spacer 7a is interposed between the liquid crystal display device 1 and the backlight lighting device 22,
These liquid crystal display device 1 and backlight illumination device 22
And the spacer 7a form a space 8a. Like the spacer 7, the spacer 7a has an elastic member surrounded by an adhesive member, and has a gap at a corner to dissipate the heat generated by the light source 25.

The backlight illumination device 22 includes a light source 2
5, a reflection plate 26, and a diffusion plate 27. Light emitted from a light source 25 realized by a cold-cathode tube or the like spreads over the entire surface of the diffusion plate 27 by the reflection plate 26, and the diffusion plate 27 uniformly diffuses the light and makes the light enter the liquid crystal panel 4. Thus, the display area 1 of the liquid crystal panel 4
0 is uniformly irradiated, and good visibility can be obtained even in a dark place.

FIG. 5 is a sectional view of a liquid crystal display 31 showing a second embodiment of the present invention. FIG. 5 has a structure similar to that of FIG. 1, and thus the same reference numerals are used for the same members.
In this embodiment, instead of the spacers 7 and 7a used in the first embodiment, a spacer 32 formed by folding a so-called double-sided tape formed by attaching an adhesive 34 to both surfaces of a base material 33 is folded into two. Used. As a result, this embodiment can also obtain the same effects as those of the first embodiment.

In the above-described embodiment, a so-called plasma display or an EL (electroluminescence element) may be used instead of the liquid crystal.

As described above, in the liquid crystal display devices 1 and 31 according to the present invention, the visibility of the display area 10 is prevented from deteriorating by a simple structure, or the light emitted from the backlight illumination device 22 to the protection plate 9 is reduced. Irradiation unevenness due to the presence of the foreign matter 12 can be suppressed, and good display quality can be maintained for a long time.

Further, in the assembling process, the trouble of disassembling and reassembling the apparatus only for removing foreign matter can be omitted, and the assembling process does not need to be performed in a much cleaner environment, so that the cost can be reduced. it can.

[0026]

As described above, according to the present invention, foreign matter that has undesirably entered the space formed by the protective plate, the intervening member, the display panel or the backlight illumination device can be removed.
The adhesive may be adhered to an adhesive substance applied to a surface facing the space of the interposition member, and may be fixed outside a display area of the display panel.

With such a very simple structure, it is possible to prevent the visibility of the display area from deteriorating, or to suppress the occurrence of irradiation unevenness due to the presence of foreign matter in the light emitted from the backlight illumination device to the protective plate. Good display quality can be maintained over a long period of time.

Further, in the assembling process, it is possible to eliminate the trouble of disassembling and reassembling the apparatus only for the purpose of removing foreign substances, and it is not necessary to perform the assembling process in a much cleaner environment. Can be planned.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device 1 showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the liquid crystal display device 1.

FIG. 3 is a cross-sectional view showing a state in which a foreign substance 12 has entered the liquid crystal display device 1.

FIG. 4 is a cross-sectional view of an electronic device 21 using the liquid crystal display device 1.

FIG. 5 is a sectional view of a liquid crystal display device 31 according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a display device 41 showing a first conventional technique.

FIG. 7 is a sectional view of a display device 51 showing a second conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 31 Liquid crystal display device 2 Lower substrate 3 Upper substrate 4 Liquid crystal panel 5 Elastic member 6 Adhesive member 7, 7a, 32 Spacer 9 Space 9 Protective plate 10 Display area 11 Gap 12 Foreign matter 21 Electronic device 22 Backlight illumination device 25 Light source

Continuation of the front page (56) References JP-A-4-3193 (JP, A) JP-A-3-290620 (JP, A) JP-A-2-282782 (JP, A) Japanese Utility Model No. 3-92079 (JP) , U) Japanese Utility Model 3-100886 (JP, U) Japanese Utility Model 4-40272 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09F 9/00 G02F 1/1333

Claims (1)

(57) [Claims] 1. A display device in which at least one of a protective plate and a backlight illumination device is assembled to a display panel via an intervening member, wherein the intervening member surrounds a display area of the display panel, A display device wherein at least a side surface of the display panel on a display region side is formed to have adhesiveness.