JP5602557B2 - Outdoor image display device - Google Patents

Description

  The present invention relates to an image display apparatus for outdoor installation, and more particularly to an image display apparatus having a sealed housing.

2. Description of the Related Art Conventionally, an image display device installed outdoors employs a case having a sealed structure, and prevents rainwater from entering the inside of the case.
For example, the image display apparatus shown in FIG. 5 accommodates an image display unit (9) having an image display surface (90) inside a housing (92), and the front opening of the housing (92) is made of transparent glass. Waterproofing is achieved by closing with a protective panel (91).

  Further, it has been proposed that a waterproof sheet, a gasket, or the like is interposed between the front opening of the housing (92) and the protective panel (91) to achieve complete waterproofing (Patent Document 1). ).

JP 2005-309268 A

  However, as shown in FIG. 5, the image display unit (9) is accommodated in the housing (92), and the front opening of the housing (92) is closed by the protective panel (91). In this case, moisture in the air inside the housing (92) is condensed as the outside air temperature is lowered, and there is a possibility that water droplets adhere to the back surface of the protective panel (91).

  In order to solve this problem, a transparent resin is injected into the gap S formed between the image display surface (90) of the image display unit (9) and the protection panel (91), so that the protection panel (91) Although it is conceivable to prevent dew condensation from occurring on the back surface of the glass, there is a risk that air bubbles may get caught in the resin when the transparent resin is injected, which causes a problem that the quality of the display image is remarkably lowered.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an outdoor image display device in which there is no risk of condensation on the back surface of a protective panel and a high quality display image can be obtained.

The outdoor image display apparatus according to the present invention is
An image display panel having an image display surface;
A translucent protective panel covering the front surface of the image display panel;
A bonding layer formed by curing a photocurable resin, and interposed between the image display panel and the protection panel without a gap,
A housing having an opening for accommodating the image display panel and allowing the image display surface of the image display panel to be viewed through the protection panel, and is waterproof between the protection panel and the housing A structure is provided.

  In the assembly process of the outdoor image display device of the present invention, a photocurable resin is applied to the surface of the image display panel, and then a protective panel is overlaid on the surface of the photocurable resin. In this process, there is no possibility that air bubbles may get caught in the photocurable resin. In this state, light is irradiated from the surface side of the protective panel to cure the photocurable resin. As a result, the protective panel is bonded to the surface of the image display panel via the bonding layer. Thereafter, the image display panel is accommodated in the housing, and the protective panel and the housing are joined to each other through a waterproof structure.

  In the outdoor image display apparatus assembled in this manner, a bonding layer is interposed between the image display panel and the protection panel, and the bonding layer is in close contact with the back surface of the protection panel. No condensation occurs on the back. Therefore, when an image is displayed on the image display surface of the image display panel, the image can be viewed with high quality through the bonding layer and the protective panel.

In a specific aspect, the waterproof structure is configured by a gasket interposed between opposing surfaces of the protective panel and the housing. The casing has a sealed structure.
As a result, complete waterproofing is achieved, and there is no possibility of rainwater entering the inside of the housing.

  According to the outdoor image display apparatus according to the present invention, there is no risk of condensation on the back surface of the protective panel, and a high quality display image can be obtained.

FIG. 1 is a perspective view showing an appearance of an outdoor image display apparatus according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the outdoor image display apparatus. FIG. 3 is a perspective view showing a state in which a protective panel is bonded to the image display unit via a bonding layer. FIG. 4 is a diagram illustrating a bonding process in which a protective panel is bonded to the image display unit via a bonding layer. FIG. 5 is a longitudinal sectional view of a conventional outdoor image display apparatus.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, an outdoor image display apparatus according to an embodiment of the present invention includes a casing (8) made of a synthetic resin bezel (81) and a back cabinet (82). The image display surface (10) can be visually recognized from the front opening portion.

  As shown in FIG. 2, an image display unit (1) having an image display surface (10) is accommodated in the housing (8), and the front opening of the housing (8) is a protective panel made of transparent glass. It is blocked by (2). Thus, the housing (8) has a sealed structure.

Further, a bonding layer (3) obtained by curing a photocurable resin is interposed between the image display surface (10) of the image display unit (1) and the back surface of the protective panel (2) without any gap. Yes.
As the photocurable resin, for example, an acrylic adhesive resin having ultraviolet curable properties can be used. In this case, as shown in FIG. 4A, after the photocurable resin (31) is applied to the surface of the image display unit (1), the protective panel (2) is overlaid on the surface of the photocurable resin (31). . In this state, ultraviolet rays are irradiated from the surface side of the protective panel (2) as shown in FIG. 4B to cure the photocurable resin (31) (see, for example, WO2009 / 011366).

  Thus, the bonding layer (3) is in close contact with the image display surface (10) of the image display unit (1) and the back surface of the protective panel (2), and the bonding layer is formed on the front surface of the image display unit (1) as shown in FIG. The protective panel (2) is joined via (3).

  As shown in FIG. 2, the image display unit (1) includes an image display panel (5) composed of a liquid crystal display panel having an image display surface (10) formed on the front surface, and a lens film (12 ) And a diffuser film (13), a backlight (11) arranged on the back side thereof, a panel guide (14) for supporting the image display panel (5), and an image display panel on the panel guide (14) ( 5) and a frame-shaped metal frame (6) for holding the frame.

As shown in FIG. 2, between the opposing surface of the back outer periphery of the protective panel (2) and the outer peripheral edge of the back cabinet (82), the front outer periphery of the protective panel (2) and the opening edge of the bezel (81) An annular gasket (80) is interposed between the surfaces facing each other.
And, in the vicinity of the gasket (80), the back cabinet (82) and the bezel (81) are fastened to each other by screws, whereby the back cabinet (82) and the bezel (81) are pressed against each other, The gasket (80) is strongly clamped by the screw tightening force, and a waterproof structure is provided between the outer periphery of the protective panel (2) and the peripheral edge surrounding the opening of the image display unit (1). become.

According to the outdoor image display apparatus, air bubbles do not bite into the photocurable resin (31) in the bonding step shown in FIG. 4, but the photocurable resin cured by irradiation with ultraviolet rays. (31) is in close contact with the back surface of the protective panel (2).
Accordingly, no condensation occurs on the back surface of the protective panel (2) even when the outside air temperature is lowered. Therefore, when an image is displayed on the image display surface (10) of the image display unit (1), the image can be viewed with high quality through the bonding layer (3) and the protective panel (2). .

  Further, the waterproof structure by the sealing structure of the casing (8) and the waterproof structure by the gasket (80) ensures complete waterproofing, and there is no possibility of rainwater entering the casing (8). Therefore, it can be used for a long time outdoors.

  In addition, since the bonding layer (3) is filled in the space between the image display panel (5) and the image display unit (1), the heat released from the image display unit (1) is applied to the bonding layer (3). After that, it is efficiently transmitted to the protective panel (2) and diffused from the surface of the protective panel (2) to the outside, so that the heat dissipation is good.

In the conventional image display apparatus, it has been proposed to interpose a bonding layer formed by curing a photocurable resin between the image display unit and the protective panel, but the purpose thereof is exclusively for indoor use. In the display device, heat dissipation from the image display unit is improved by forming a bonding layer.
The present invention adopts a bonding technique using a photocurable resin together with a waterproof structure in order to prevent condensation, which is a problem peculiar to an outdoor image display apparatus, exclusively in an outdoor image display apparatus.

  Each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, the waterproof structure between the housing (8) and the protective panel (2) is not limited to the one using the gasket (80), and various known waterproof structures can be adopted.

(1) Image display unit
(10) Image display surface
(2) Protection panel
(3) Bonding layer
(31) Photo-curing resin
(5) Image display panel
(8) Case
(81) Bezel
(82) Back cabinet
(80) Gasket

Claims (3)

An image display panel having an image display surface;
A translucent protective panel covering the front surface of the image display panel;
A bonding layer formed by curing a photocurable resin, and interposed between the image display panel and the protection panel without a gap,
A housing having an opening for accommodating the image display panel and allowing the image display surface of the image display panel to be viewed through the protective panel; and the bezel having the opening. And back cabinet,
An annular gasket is interposed between the facing surfaces of the outer peripheral portion of the back surface of the protective panel and the outer peripheral edge portion of the back cabinet, and between the facing surfaces of the front outer periphery portion of the protective panel and the opening edge of the bezel. An outdoor image display device , wherein the gasket is waterproofed . The outdoor image display apparatus according to claim 1, wherein the housing has a sealed structure. The outdoor image display apparatus according to claim 1, wherein the bezel and the back cabinet are fastened to each other by screws, and the gasket is clamped by a fastening force of the screws .

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