JPH06250155A - Dustproof structure for planar display - Google Patents

Abstract

PURPOSE:To provide a dustproof structure without generating the disturbance in the display of a planar display even when external force is applied to a case and preventing the entering of dust. CONSTITUTION:In the dustproof structure of a planar display harmetically sealed by interposing a packing 1 between the case 2 and a liquid crystal display 4 for preventing the entering of dust from the outside into the display surface part of the liquid crystal display 4 in the case 2 when the liquid crystal display 4 being the planar display is mounted in the case 2 provided with a transparent look through window for viewing a display contents from the outside, this structure is constituted so as to be provided with a mounting structure surrounding the display surface part of the liquid crystal display 4 and pressing the packing 1 consisting of material easily deformed by external force between the inside surface of the case 2 and the liquid crystal display 4, and a rib 1b with a tapered shape integrally projected in the direction of thickness over the whole periphery and elastically contacting with the liquid crystal display by bending at the time of being pressed by the mounting structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof structure for preventing dust from entering a display surface portion when mounting a planar display such as a liquid crystal display in a case.

[0002]

2. Description of the Related Art A planar display such as a liquid crystal display is provided with a dust-proof structure because if the dust enters the display surface, the readability of the displayed content deteriorates. An exploded perspective view of FIG. 4 shows a conventional display device having this type of dustproof structure. In this figure, the display panel 5 has a structure in which a liquid crystal display 4 is fitted in a frame 3 having an opening in the front surface, and a printed circuit board 6 for driving a liquid crystal is attached to the frame 3. A packing P having a rectangular cross section is attached around the transparent window 2c on the inner surface of the case 2, and the display panel 5 is sandwiched by the packing P.
Is attached to the inner surface of the case. After that, the rear cover 7
The display device 12 is configured by covering the case 2 with the. In the display device having such a configuration, when the display panel 5 is mounted on the case 2, a slight gap is formed between the frame 3 and the case 2 as shown in FIG. The packing P, which is slightly thicker than the gap, is compressed by both, and the display space 8 and the display outer space 9 are formed.
Is blocked, and the invasion of dust into the display space 8 can be prevented.

Further, in the display device 13 shown in FIG. 6, the printed circuit board 6 is attached to the back surface of the frame 3A having no opening, and the liquid crystal display 4 is fitted inside the front surface of the frame 3A to form the display panel 5. I am configuring.
Other configurations are similar to those of the display device of FIG. In this display device 13, as shown in FIG.
And a packing P interposed in the gap formed between the liquid crystal display 4 and the case 2.
Is compressed, the packing P allows the display space 8
Is sealed to prevent dust from entering.

[0004]

In the conventional dustproof structure as shown in FIG. 5, since the packing P is compressed by the inner surface of the case 2 and the frame 3, the inner frame area 10 is formed.
It is not possible to prevent dust existing in the space from entering the display space 8.

On the other hand, in the dustproof structure shown in FIG.
Is compressed by the inner surface of the case 2 and the liquid crystal display 4, the outer space 9 of the display unit and the inner region 10 of the frame
It is possible to prevent dust from entering. However, since the packing P is in direct contact with the liquid crystal display 4, the case 2
When an external force is applied to the vicinity of the see-through window, the thin resin case 2 is slightly deformed to make the device lighter, thinner, and smaller, and the case 2
When the distance between the inner surface of the liquid crystal display and the liquid crystal display 4 becomes narrow, the packing P, which has already been compressed and deformed in the mounted state, cannot absorb the external force so much, the liquid crystal display 4 is loaded, and the liquid crystal display is disturbed. This causes a problem that the display content becomes difficult to read. Especially when there is an operation push button near the see-through window, when you press the button,
Since the case 2 is also pressed, the same problem will occur every time the button is operated.

The present invention has been proposed in order to solve the problems of the prior art as described above. Even if an external force is applied to the case, the display of the planar display is not disturbed and the display surface portion is not disturbed. It is an object of the present invention to provide a dustproof structure capable of preventing dust from entering the interior.

[0007]

[Means for Solving the Problems] To achieve this object
In addition, the present invention provides a transparent watermark for displaying the display content from the outside.
For mounting a planar display on a case with a window
Externally on the display surface of this planar display inside the case.
In order to prevent dust from entering the
A sheet-like disc that seals with play by sealing it.
Display on a planar display in the dustproof structure of the spray
Made of a material that surrounds the surface and is easily deformed by external force
Compress packing between inner surface of case and planar display
Assembling structure and the thickness direction over the entire circumference of the packing
Projected integrally and compressed by the above-mentioned assembly structure
Sometimes the ribs bend and make elastic contact with the planar display.
The rib preferably has a tapered cross-sectional shape.
It has a different structure.

[0008]

According to the above-described structure, when the packing is compressed, the ribs bend and make elastic contact over the entire circumference of the planar display, which prevents dust from entering the display surface from the outside. Further, since the ribs are elastically contacted with the planar display in a bent state, even if an external force is applied to the case, the load due to this external force is absorbed by the ribs and is not directly applied to the planar display, resulting in display disorder. Absent. Further, by making the ribs have a tapered cross-section, the elasticity of the ribs increases and the effect of relaxing the external force increases.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the dustproof structure for a flat display according to the present invention will be described below in detail with reference to the drawings. An exploded perspective view of FIG. 1 shows an embodiment of a display device when this dustproof structure is applied to mounting a liquid crystal display. In this figure, a display device 11 is a frame in which a resin case 2 having a transparent window 2c made of a transparent resin plate on the front surface, a packing 1 fitted in the outer peripheral portion of the transparent window portion, and a liquid crystal display 4 are mounted. 3, a display panel 5 to which a printed circuit board 6 for driving a liquid crystal is attached, and a rear cover 7.

The packing 1 is made of a low-hardness rubber material that is easily deformed by an external force, and is formed in a rectangular shape having an opening 1c that is appropriately larger than the see-through window 2c of the case 2. A plurality of rectangular ribs 1a are provided on one surface of the packing 1, and these ribs 1a are fitted into elongated holes 2a provided at several places around the transparent window 2c.
The packing 1 is positioned around the transparent window 2c inside the case. This packing 1 facing the liquid crystal display 4 side
As shown in FIG. 2, a rib 1b is provided on the surface opposite to the above in the thickness direction so as to project over the entire inner circumference. The cross-sectional shape of the rib 1b is a tapered shape, for example, a triangular shape with a sharp tip, and when the packing 1 is compressed by the case 2 and the display panel 5, the rib 1b forms an outer peripheral surface of the liquid crystal display 4. Comes into elastic contact with.

The frame 3 made of resin material or metal is
The liquid crystal display 4 has a box-like shape having an opening 3b which is slightly larger than the display area of the liquid crystal display 4, and has a display area (display surface portion).
After fitting the liquid crystal display 4 with 4a down, into this frame 3, hook-shaped ribs 3 protruding from the frame 3
The display panel 5 is constructed by fixing the printed circuit board 6 by hooking a on several holes on the printed circuit board 6 side.

A rib 2b for fixing the display panel 5 is provided on the inner surface of the case 2, and after the packing 1 is attached to the inside of the case 2, the liquid crystal display 4 is turned down and the display panel 5 is attached. The display panel 5 is positioned and fixed to the case 2 by inserting the rib 2b into the hole on the printed circuit board 6 side. In this state, the packing 1 is compressed by the frame 3 of the display panel 5 and the inner surface of the case 2. As described above, the display panel 5 and the case 2 have an assembly structure for compressing the packing 1. Subsequently, the display device 11 is configured by covering the case 2 with the rear cover 7. On this occasion,
The entire display area 4a of the liquid crystal display 4 can be seen from the outside of the device through the transparent window 2c. Packing 1 is
Since the opening 1c is larger than the transparent window 2c, it cannot be seen from the outside of the device.

In the display device 11 thus constructed,
As shown in FIG. 3, the printed circuit board 6 is positioned in the thickness direction of the device by the ribs 2b of the case 2 and the ribs 7a of the rear cover 7, and the transparent window 2c, the frame 3, and the transparent window 2c.
A constant gap is formed between the liquid crystal display 4 and the liquid crystal display 4. The thickness of the packing 1 is set to be equal to the distance between the transparent window 2c and the frame 3, and the rib 1a of the packing 1 fits into the hole 2a of the case 2 and is sandwiched between the transparent window 2c and the frame 3. , The packing 1 is fixed.

The pointed rib 1b provided along the opening 1c of the packing 1 has the opening 3 of the frame 3 when mounted.
The height of the rib 2b is slightly larger than the distance between the transparent window 2c and the liquid crystal display 4 because the height of the rib 2b is set inside the rib b. Over time, the liquid crystal display 4 contacts and bends. Thereby, the display portion space 8 between the display surface portion and the see-through window 2c is shielded from the display portion outer space 9 and the frame inner region 10, and dust can be prevented from entering the display portion space 8. Further, even if the thin case 2 bends due to an external force applied to the vicinity of the transparent window 2c of the case 2 and the gap between the transparent window 2c and the liquid crystal display 4 becomes narrow, elastic contact with the liquid crystal display 4 is made. Since the tips of the ribs 2b are easily deformed and the load due to the external force is not directly applied to the liquid crystal display 4, the display is not disturbed.

The dustproof structure of the present invention can be applied not only to liquid crystal displays but also to other planar displays such as EL displays.

[0016]

As described above, according to the present invention, packing having ribs integrally projecting over the entire circumference in the thickness direction is arranged so as to surround the display space, and is compressed by mounting. Since the ribs of the packing are deformed to come into contact with the planar display, it is possible to prevent dust from entering the display unit space from the space outside the display unit and the space inside the frame. Further, since the ribs of the packing elastically contact the planar display in a bent state, even if the case is deformed by an external force, the planar display is not directly loaded and the display content of the display can be prevented from being disturbed. . In particular, when the rib has a tapered cross-sectional shape such as a triangular shape with an acute tip, the elasticity of the rib increases and the effect of absorbing an external force increases.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a display device including a dustproof structure for a planar display according to the present invention.

FIG. 2 is a sectional view taken along line AA showing a packing used in the dustproof structure shown in FIG.

3 is a longitudinal sectional view of a main part of the display device of FIG.

FIG. 4 is an exploded perspective view of a display device having a conventional dustproof structure.

5 is a vertical cross-sectional view of the display device of FIG.

FIG. 6 is an exploded perspective view showing another example of a display device having a conventional dustproof structure.

7 is a vertical cross-sectional view of the display device of FIG.

[Explanation of symbols]

 1 Packing 1b Rib 2 Case 2c Through Window 3 Case 3b Opening 4 Liquid Crystal Display 5 Display Panel 6 Printed Circuit Board 7 Rear Cover 8 Display Area 9 Outside Display Area 10 Frame Area 11 Display Device

Claims (2)

[Claims] 1. When mounting a planar display in a case having a transparent see-through window for viewing the display contents from the outside, a planar display that seals with a packing interposed between the case and the planar display. In the dustproof structure, an assembly structure that encloses a display space facing the planar display and compresses a packing made of a material that is easily deformed by an external force between the inner surface of the case and the planar display, A planar display characterized by having a rib integrally projecting in the thickness direction over the entire circumference of the packing, and having a rib that bends and elastically contacts the planar display when compressed by the assembly structure. Dust-proof structure. 2. The dustproof structure for a planar display according to claim 1, wherein the rib has a tapered cross section.