JP2002013953A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device making a display satisfactorily visible even when it is moved to a place having a large difference in moisture quantity and temperature in the atmosphere. SOLUTION: This display device is provided with a display main body 1, a cover glass 2 provided to visibly cover the display of the display main body 1, and a case 3 surrounding the display main body 1 together with the cover glass 2. The case 3 is provided with a thin portion (heat conducting section) 3a transferring heat faster than the cover glass 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for an instrument for a vehicle, and more particularly to a display device capable of displaying a display in a good condition even in cold weather.

[0002]

2. Description of the Related Art Conventionally, when the surface of a cover glass for an instrument such as a motorcycle or a construction machine is placed at a temperature lower than the dew point of the atmosphere in cold or rainy weather, the moisture in the atmosphere condenses and the inner surface of the glass is condensed. Condensation may form. Since the condensed water droplets generated by the condensation scatter light, the cover glass becomes apparently opaque, and the visibility of the instrument display viewed through the cover glass may be impaired.

Further, as the condensation of moisture progresses further, fine condensed water enemies fuse with each other to grow into larger discrete water droplets, and light is refracted at the interface between the water droplet and the surface and at the interface between the water droplet and the air. As a result, optical obstructions such as darkening, blurring, spots, and clouding occur on the surface, and the visibility of the instrument display may also be impaired.

In order to prevent such an optical obstacle,
For example, as disclosed in JP-A-9-229724, an antifogging composition containing a hydrophilic compound such as polyethylene glycol is applied to a cover glass.

[0005]

However, a vehicle equipped with an instrument having a cover glass provided with such an antifogging composition is moved to a place where there is a great difference in the amount of moisture and the temperature in the atmosphere. When moving, there is a possibility that the effect of the anti-fogging composition may exceed the allowable range and water droplets may be formed on the cover glass surface.

Further, a cover glass of an instrument mounted on a vehicle which needs to move from an atmosphere having a humidity of about 20 degrees Celsius to an atmosphere below freezing, such as a snowmobile or a forklift moving to a freezer from a garage. In, the antifogging composition containing a large amount of water is rapidly cooled in an atmosphere below the freezing point and freezes, so that the cover glass surface becomes white and the visibility of the instrument display may be lost.

In view of the above situation, an object of the present invention is to provide a display device that can display a display in a good condition even when the display is moved to a place where there is a great difference in the amount of moisture and the temperature in the atmosphere. Aim.

[0008]

According to a first aspect of the present invention, there is provided a display device, comprising: a display body; a cover glass provided to cover a display of the display body so as to be visible; And a case surrounding the display body together with the glass, wherein the case is provided with a heat conducting portion that conducts heat faster than the cover glass.

According to a second aspect of the present invention, in the display device according to the first aspect, the surface of the cover glass on the display main body side has an anti-fogging property that suppresses generation of condensed water droplets of moisture. It is characterized by applying the composition.

According to a third aspect of the present invention, in the display device according to the first or second aspect, the heat conducting portion is made of a material or a thickness that conducts heat faster than heat conduction of the cover glass. It is characterized by being formed by.

According to a fourth aspect of the present invention, in the display device according to any one of the first to third aspects,
The heat conduction part is formed substantially over the entire area of the case.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below as an example of an instrument mounted on a snowmobile and will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view of an instrument according to an embodiment of the present invention, which comprises a display main body 1, a cover glass 2, and a case 3.

The display body 1 includes a pointer display section 11, a liquid crystal display section 12, and a circuit board 13. The pointer display section 11 prints a pointer 11a and an index section such as a character and a scale to be indicated by the pointer 11a. Display plate 11b formed and pointer 1
1a is provided with a driving unit 11c for giving a rotational drive according to the speed value of the snowmobile, so that the driver can measure the speed of the snowmobile. Liquid crystal display 1
Reference numeral 2 denotes a liquid crystal display element 12a provided as desired from a window 11d formed by cutting out the display panel 11b, and a wiring 12b for electrically connecting the liquid crystal display element 12a to the circuit board 13. And time. The circuit board 13 includes the pointer display section 11 and the liquid crystal display section 1.
2. It supplies a drive current to various electronic components such as a light source bulb 14 for illumination.

The cover glass 2 is provided so as to visually cover the display surface of the display body 1 with a transparent resin made of an acrylic resin or the like having a substantially uniform thickness. This is to prevent adhesion to the display main body 1 on which various electronic components are mounted.

The cover glass 2 is coated with an anti-fogging composition 21 containing a hydrophilic compound such as polyethylene glycol on the surface of the display body 1, and the cover glass 2 is made hydrophilic to cover the surface. Glass 2 and case 3
This prevents moisture in the air surrounded by the above from condensing and forming water droplets on the cover glass 2 surface.

The upper case 3 is made of AES resin material.
1 and a lower case 32, and are provided so as to surround the entire periphery of the display main body 1 together with the cover glass 2. Note that the upper case 31 is formed integrally with the cover glass 2 without any gap by insert molding the cover glass 2. The lower case 32 is provided so as to face the opening of the upper case 31, and a drain hole 33 is formed at a lower end of the lower case 32 for preventing water droplets from collecting.

A thin portion (heat conducting portion) 3a having a thickness of half or less of the thickness of the cover glass 2 is provided at predetermined positions of the upper case 31 and the lower case 32 constituting the case 3. .

The thin portion 3 a is for transmitting the temperature outside the case 3 to the inside of the case 3 faster than the cover glass 2. Therefore, the temperature outside case 3
When the temperature is lower than the inside temperature, that is, when the entire instrument is cold, the condensation of moisture occurring on the thin-walled portion 3a progresses faster than the condensation of moisture occurring on the surface of the cover glass 2; By changing into water droplets, the amount of moisture in the air in the case 3 can be reduced, and has the effect of suppressing the progress of condensation of moisture on the surface of the cover glass 2. Therefore, it is possible to prevent the surface of the cover glass 2 from being fogged by the water droplets and the display on the display main body 1 from being difficult to recognize.

Further, even when the instrument is cooled by moving from a normal temperature atmosphere having moisture to below freezing point (for example, from 20 degrees Celsius to minus 20 degrees Celsius),
Since the amount of moisture contained in the antifogging composition 21 of the cover glass 2 can be suppressed, it is possible to prevent the antifogging composition 21 from freezing and becoming white, making it difficult for the display on the display body 1 to be visually recognized. .

Further, the light source bulb 14 for illumination provided in the case 3 can increase the temperature of the air in the case 3 as a heat-generating member, and can suppress freezing of the anti-fog composition 21. . The same effect can be obtained by providing an electronic component that actively generates heat in the case instead of the light source bulb 14, and the antifogging composition freezes and turns white, and the display on the display body is visually recognized. It is possible to suppress the difficulty.

In the embodiment of the present invention, the thermal conductivity of each material of the cover glass 2 and the case 3 is substantially the same, so that the thermal conductivity is made different depending on the thickness. Depending on the material, it is possible to have a difference in heat conduction,
For example, even when a cover glass made of an acrylic resin material and a case made of an iron material are combined, the same effect as in the above-described embodiment can be obtained.

In the embodiment of the present invention, the case where the thin portion 3a is provided at a predetermined position of the case 3 has been described as an example. However, the present invention is not limited to this. The case 3 can be formed to be thin, or almost the entire area of the case 3 can be formed to be thin. By forming the thin portion wide, in addition to the effects of the above-described embodiment, more efficient heat conduction is promoted. It will be.

In the embodiment of the present invention, the cover glass 2 coated with the hydrophilic anti-fogging composition 21 is described as an example. However, even if the cover glass 2 is not coated with the anti-fogging composition. Good, may be coated with a water-repellent anti-fog composition, as in the above embodiment, by suppressing the progress of condensation of moisture on the cover glass surface, the display of the display body It is possible to suppress the difficulty in visual recognition.

[0025]

According to the present invention, there is provided a display body, a cover glass provided so as to cover the display of the display body so as to be visible, and a case surrounding the display body together with the cover glass. By providing a heat conducting portion that conducts heat faster than the cover glass, even if the display device is moved to a place where there is a large difference in the amount of moisture in the atmosphere and the temperature, a display device that can display the display in good condition is provided. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an instrument according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display main body 2 Cover glass 21 Antifogging composition 3 Case 3a Thin part (heat conduction part)

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[Procedure amendment]

[Submission date] July 11, 2000 (2007.1.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003] Further, as the condensation of moisture proceeds further, fine condensed water droplets fuse with each other and grow into larger discrete water droplets. At the interface between the water droplet and the surface and the interface between the water droplet and the air, the light is refracted by light. In addition, the surface may be optically impaired such as dark, blurred, mottled, or fogged, and the visibility of the instrument display may also be impaired.

Claims (4)

[Claims] 1. A display device comprising: a display body; a cover glass provided so as to cover a display of the display body so as to be visible; and a case surrounding the display body together with the cover glass, wherein the case includes the cover glass. A display device, comprising: a heat conducting portion that transmits heat faster than the heat conducting portion. 2. The display device according to claim 1, wherein an antifogging composition for suppressing the generation of condensed water droplets of moisture is applied to a surface of the cover glass on the display main body side. . 3. The display device according to claim 1, wherein the heat conducting portion is formed of a material or a thickness that conducts heat faster than heat conduction of the cover glass. . 4. The display device according to claim 1, wherein said heat conducting portion is formed substantially over the entire area of said case.