JP2535572Y2 - Display device for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle display device for displaying driving information to a driver at an instrument panel position of a vehicle.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a display device for a vehicle which uses a reflection of a concave mirror or the like to perform a distant display in order to increase a visual recognition speed of a display.

As a vehicle display device for remote display, for example, as shown in FIG. 4, a display 1 composed of a fluorescent display tube or the like for displaying a vehicle speed or the like is arranged at a lower portion in an instrument panel 4a. . A mirror 3 is disposed at the upper portion of the instrument panel 4a so as to face the display surface of the display 1 with a reflecting surface formed of a concave mirror facing the display 3. Further, between the mirror 3 and the display 1 Is half mirror 2
Are arranged as light-transmitting directional members. In addition, a front plate 5 made of a transparent acrylic plate is arranged in the light reflection direction of the half mirror 2 to prevent dust and the like from entering the device. Reference numeral 6 denotes a shielding plate for preventing external light from being incident on the display 1 and being washed out.

With this configuration, the display light emitted from the display device 1 passes through the half mirror 2, reaches the mirror 3, and is reflected by the mirror 3. Further, the display light reflected by the mirror 3 is reflected by the half mirror 2, passes through the front plate 5 and passes through the driver's viewpoint 8.
To reach. Therefore, from the perspective 8 near the driver, the display image of the display 1 will be visible as a distant view image as a virtual image X ₀ behind the half mirror 2 (vehicle front).

[0005]

An invention is to solve However, in the vehicle display device described above, as shown in FIG. 5, the virtual image X as another unnecessary ghost desired virtual image X ₀ of the display image from being visually recognized . The virtual image X is generated when display light from the display 1 is transmitted through the half mirror 2 and reflected on the front plate 5.

As shown in FIG. 5, there is an area where the display light emitted from the display 1 passes through the half mirror 2 and reaches the front plate 5 directly. That is, the position where the light emitted from the front of the display 1 passes through the upper part of the shielding plate 6 and enters the front plate 5 at the incident angle θ ₂ , and the light emitted from the rear of the display 1 is (Hereinafter, referred to as an A region) between a position at which the light passes through the upper portion and enters the front plate 5 at an incident angle θ ₁ . The area A is an area where the display 1 can be directly viewed from the front plate 5.

[0007] The amount of certain of the display light impinging directly on the A region from the display device 1 makes a virtual image X ₁ is reflected. The reflected light to create a virtual image X ₂ is reflected by the half mirror 2, create a virtual image X ₃ and further reflected by the mirror 3. The light reflected by the mirror 3 is again reflected by the half mirror 2 and passes through the front plate 5 to reach the driver's viewpoint 8. Therefore, from the perspective 8 near the driver, the virtual image X is viewed as a ghost image in a state of overlapping below the desired virtual image X _0.

[0007] Such ghost image is also unsightly not only hinder the visibility of the desired virtual image X _0, thus significantly reducing the marketability of the vehicular display apparatus. As a countermeasure, there is a method of lowering the display 1 to eliminate the area A, or a method of applying an anti-reflection coating to the front plate 5, but the former is difficult due to a space problem, and the latter has a high manufacturing cost. It is only a problem. Furthermore, using the method of affixing the smoke plate front plate 5, the ghost image is but loss becomes darker brightness of the virtual image X ₀ of interest at the ratio is often less noticeable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicular display device capable of suppressing a decrease in luminance of a display image and removing a ghost image at low cost.

[0009]

According to the present invention, there is provided a display, a reflective member having a reflective surface facing the display surface of the display, and the display located between the display and the reflective member. And a light transmission direction control member that reflects display light from the reflection member and reflects the light reflected from the reflection member so that the driver can visually recognize the light transmission direction control member. A vehicle display device comprising a transparent top plate, and at least a part of the top plate has a desired range of the display, wherein the top plate has a polarization characteristic. And

[0010]

According to the above construction, the display light emitted from the display is transmitted through the light transmission direction control member and reflected by the reflection member.
Further, the light is reflected by the light transmission direction control member, passes through the front plate having polarization characteristics, and reaches the driver's viewpoint. Therefore, when viewed from the viewpoint, the display image of the display is displayed as a virtual image in front of the light transmission direction control member as a virtual image.

Further, light reflected from the display directly on the front plate is reflected by the light transmission direction control member, further reflected by the reflection member, reflected again by the light transmission direction control member, and transmitted through the front plate. However, most of the reflected light component vibrates perpendicularly to the light incident surface of the front plate (S component), so that a small amount of light passes through the front plate having a polarization characteristic of blocking this component. For this reason, the ghost image due to the reflected light is reduced to such an extent that it is hardly noticeable.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in the vehicle display device according to the embodiment of the present invention, a display device 1 such as a fluorescent display tube for displaying a vehicle speed and the like is disposed at a lower portion in the instrument panel 4a. A mirror 3 is disposed at the upper portion of the instrument panel 4a so as to face the display surface of the display 1 with a reflecting surface formed of a concave mirror facing the display 3. Further, between the mirror 3 and the display 1 The half mirror 2 is disposed as a light-transmitting directional member. Reference numeral 6 denotes a shielding plate for preventing external light from being incident on the display 1 and being washed out.

A transparent front plate 7 is disposed in the light reflection direction of the half mirror 2 to prevent dust and the like from entering the device. The front plate 7 is formed by bonding a transparent acrylic plate 7a and a polarizing plate 7b that allows a P component vibrating in parallel to the light incident surface to pass a P component, and as shown in FIG. 2, an acrylic plate having a certain curved surface. 7a is the front side of the device, and the polarizing plate 7 is
b is affixed. On the contrary, the acrylic plate 7
The polarizing plate 7b may be adhered to the front side of “a”, or the front plate 7 itself may be composed of only the polarizing plate 7b.

The polarizing plate 7b has a polarization characteristic of passing only a P component that vibrates in parallel with the incident surface among the vibration components in the light.

It is well known that the reflectivity of light incident on a transparent object is greatly different between a P component vibrating parallel to the incident surface and an S component vibrating perpendicular to the incident surface depending on the angle of incidence. For example, as shown in FIG. 3, when light is incident on glass having a refractive index of 1.5 from the air, the reflectance R _s of the P component becomes smaller than the reflectance of the S component in the range of an incident angle of 30 ° to 60 °. significantly less than, the reflectivity R _p is almost zero of P components in the vicinity 50 °.

Therefore, as shown in FIG. 4, most of the reflected light of the light incident on the front plate 7 at the incident angle in the above-mentioned range has an extremely small reflection amount because the P component is largely transmitted.
Since the component is not as large as the P component, the component of the reflected light is mostly composed of the S component.

Therefore, in FIG. 1, most of the reflected light component in the region A where the display light emitted from the display 1 passes through the half mirror 2 and directly reaches the front plate 7 is an S component. Then, the reflected light is reflected by the half mirror 2, further reflected by the mirror 3, reflected by the half mirror 2 again, and transmitted through the front plate 7. However, since the polarization characteristic of the front plate 7 is such that only the P component that vibrates in parallel with the light incident surface is transmitted, the reflected light of which most of the S component transmits through the front plate 7 is extremely large. Will be less. For this reason,
The ghost image due to the reflected light is reduced to such a degree that it is hardly noticeable from the viewpoint.

[0019]

[Effect of the invention] As described above, according to the invention,
Since the front panel of the vehicle display device has polarization characteristics, it is possible to remove the ghost image created by the reflected light that is directly incident on the front panel from the display and reflected, and allows the driver to visually recognize a desired clear display image. be able to. Further, since it is only necessary to provide the front plate with polarization characteristics, it is possible to provide a vehicle display device which does not take up space, is low in cost, and has no ghost image.

[0020]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a display device for a vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example in which a polarizing plate and an acrylic plate are bonded.

FIG. 3 is a diagram illustrating a relationship between an incident angle and a reflectance of a P component and an S component when light enters a substance having a refractive index of 1.5 from an air layer.

FIG. 4 shows the P component and S of the reflected light when the light is reflected by the front plate.
FIG. 3 is a diagram specifically showing the amounts of components.

FIG. 5 is a view showing a conventional vehicle display device.

FIG. 6 is a diagram showing a display image containing a ghost image visually recognized by a conventional vehicle display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display 2 Light transmission direction control member (half mirror) 3 Reflection member (mirror) 5, 7 Front plate 7a Acrylic plate 7b Polarizing plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A display, a reflective member facing a display surface of the display with a reflective surface facing the display, and a display light located between the display and the reflective member and transmitting display light from the display. A light transmission direction control member that reflects light reflected from the reflection member and makes it visible to a driver, and a transparent front plate disposed on the front surface of the device in a light reflection direction of the light transmission direction control member. A display device for a vehicle, wherein the display plate has a polarization characteristic in at least a part of the front plate, wherein the display plate has a desired range.