JPH0452782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device used in automobiles and other vehicles.

[Summary of the idea]

The present invention uses a transparent light control film that has the function of selectively scattering only incident light that forms a specific angle with respect to the film as the front plate or cover glass of a display device used in a vehicle. By using a laminate attached to the plastic or glass surface or between the transparent plastic or glass, the instrument panel lights are prevented from reflecting off the windshield and entering the driver's eyes. This is what I did.

[Conventional technology]

Conventionally, in order to prevent display illumination from being reflected on a windshield or the like, the surrounding structure has been designed to deeply cover the display.

[Problem that the invention aims to solve] However, the above-mentioned method of blocking the illumination of the display has the problem that the design around the display is severely restricted, making it impossible to design freely. .

The present invention focuses on the above-mentioned problems in conventional vehicle displays, and proposes a vehicle display device in which display illumination is not reflected on the windshield regardless of the structure around the display.

[Means for solving problems]

That is, in the present invention, a light control film that selectively scatters only incident light within a predetermined angle range with respect to the film, and transmits incident light at other angles, is used as a front plate, such as a transparent plate. This is a display device for a vehicle that uses a laminate that is adhered to the surface of a plastic plate or glass plate, or inserted between a plurality of transparent plates.

The above-mentioned predetermined angle is an angle in the direction of the windshield when viewed from the display device, so that when the display illumination light travels toward the windshield, it is transmitted through the cover glass and scattered. .

In addition, the light control film used in the present invention is obtained by curing a resin composition consisting of an oligomer and a monomer, or monomers each having a difference in refractive index, and is preferably a photopolymerizable film having a difference in refractive index. It is obtained by irradiating and curing a resin composition consisting of an oligomer and a photopolymerizable monomer or photopolymerizable monomers together with ultraviolet rays, but the angular dependence depends on the irradiation angle of ultraviolet rays, the difference in the refractive index of the resin composition, etc. It is determined accordingly. The thickness of the light control film used in the present invention is 20 to 2000 μm. The manufacturing method of this light control film was previously disclosed in a patent application by the present inventors, Japanese Patent Application No. 1983-302500 (filed on December 18, 1988, "Light control board and its manufacturing method"), and a patent application filed in Showa Filed on June 11, 1962, "Light control board and its manufacturing method"
It is described in.

Further, the transparent plastic plate used in the present invention is not particularly limited as long as it is transparent, and any transparent plastic plate can be used. Suitable examples include polycarbonate resin, acrylic resin, methacrylic resin, and polystyrene resin. Moreover, a float glass plate can be used as the glass plate used in the present invention.

Further, in the present invention, the method of attaching the light control film and the transparent plate such as transparent plastic or glass plate is not particularly limited, and any known method can be used. For example, a light control film may be applied to the surface of a glass plate or a transparent plastic plate,
Further, a light control film may be sandwiched between glass plates or transparent plastic plates, and as shown in FIG. A glass plate or transparent plastic plate 2 may be bonded to the glass plate 2 via an adhesive sheet 4. Preferably, the outer surface of the plastic board is provided with a scratch-resistant coating.

[Effect of idea]

The vehicle display device of the present invention can prevent the display light from reflecting off the windshield, etc., without shielding the area around the display when it is dark outside the vehicle, such as in a tunnel at night.
Does not interfere with driving. Furthermore, when the driver views the display, the displayed content can be viewed in exactly the same way as when viewed through ordinary glass.

〔Example〕

Next, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples in any way.

100 parts of tribromophenoxyethyl acrylate (refractive index 1.567) per 100 parts of polyether urethane acrylate (refractive index 1.481) obtained by the reaction of polypropylene glycol with an average molecular weight of 2000, toluene diisocyanate and 2-hydroxyethyl acrylate. A resin composition containing 6 parts of benzyl dimethyl ketal and 6 parts of benzyl dimethyl ketal was placed on a 150 x 300 x 1 mm glass plate with a thickness of 300 μm as shown in Figure 1.
A rod-shaped high-pressure mercury lamp (80 W/cm, 4 kW, emission diameter 2 cm, emission length 50 cm) was applied at a distance of 50 cm from the glass surface at an angle of 50 degrees from perpendicular to the glass surface. It was placed parallel to the x-axis and irradiated with ultraviolet rays to obtain a cured sheet.

FIG. 2 shows the relationship between the incident angle of light and the haze rate when the obtained cured sheet was rotated left and right around the x-axis and the haze rate was measured from the z-axis direction. However, the angle when the light is incident perpendicularly to the surface is 0 degrees.
As can be seen from the measurement results, the obtained cured sheet had a light control function.

On the light control film 7 on this glass plate 2,
As shown in FIG. 3, an adhesive sheet 4 (DUMILAN membrane, 250 μm, Takeda Pharmaceutical Co., Ltd.) and a 1 mm thick glass plate 2 were stacked together and thermocompression bonded at 110° C. and 1 kg/cm ² . The obtained laminated glass laminate also had the same light control function as above.

The obtained light-controlling laminated glass laminate is incorporated into a display device as a cover glass, which is a front plate, so as to scatter light directed toward the windshield, and is attached to an automobile. That is, the X-axis direction of the light control film 7 in the light control laminated glass is horizontal,
And install it so that the direction of UV irradiation (tilted 50 degrees from the XZ plane) is facing the direction of the windshield. When this display device was used, the illumination of the display device was hardly reflected on the windshield even at night. This state is shown in FIG.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the manufacture of the laminate used in the present invention, Fig. 2 is a graph showing the optical properties of this laminate, Fig. 3 is a cross-sectional view of this laminate, and Fig. 4 is the display of the present invention. FIG. 2 is a schematic diagram showing the device. 1... Rod-shaped high pressure mercury lamp, 2... Glass plate, 3...
... Resin composition film, 4 ... Adhesive sheet, 5 ... Windshield, 6 ... Display device, 7 ... Light control film, 8 ... Light control laminated glass laminate.

Claims (1)

[Claims for Utility Model Registration] (1) A light control film on the surface of a transparent plate that selectively scatters only incident light within a predetermined angle range with respect to the film, and transmits incident light at other angles. A vehicle display device having a front plate made of a laminate that is adhered to or inserted between a plurality of transparent plates. (2) The vehicle display device according to claim 1, wherein the predetermined angular range is set so that the illumination of the display device is not reflected on the windshield of the vehicle when viewed from the driver's position. (3) The vehicle display device according to claim 1, wherein the film is obtained by curing a resin composition comprising oligomers and monomers or monomers each having a different refractive index. . (4) The film is obtained by irradiating and curing a resin composition comprising a photopolymerizable oligomer and a photopolymerizable monomer or photopolymerizable monomers each having a different refractive index with ultraviolet rays. A display device for a vehicle according to claim 1 of the utility model registration claim.