JPH04168413A - Vehicle display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a display device for a vehicle, and particularly to a display device for a vehicle that is a miniaturized display device for an instrument panel and a head-up display. .

(Prior Art) Recently, vehicles equipped with head-up displays have become available.

This head-up display is a device that optically projects information related to vehicle driving, such as vehicle speed values, onto the windshield.Since the vehicle speed values are displayed within the driver's forward field of vision, the driver's line of sight can be moved easily. This has the advantage that the amount of time required to confirm this information is reduced.

Examples of such a conventional vehicle display device including a head-up display include the one shown in FIG.
Alternatively, there is one described in Service Bulletin No. 599, EIO to E13, published by Nissan Motor Co., Ltd. in May 1988.

A conventional vehicle display device will be explained with reference to FIG.

This conventional vehicle display device includes a vehicle instrument 125 for display on an instrument panel in the dash board in front of the driver's seat, and a head-up display 123 that is configured separately from the vehicle instrument 125. The structure is such that they are placed on top of the meter 125 so that they do not overlap each other.

Then, the display light emitted from the display element 127 of the vehicle instrument 125 enters the driver's eyes after passing through the filter 115.

In addition, the display light for the head-up display emitted from the display element 127 disposed inside the head-up display 123 is reflected by the reflector plate 141 and transmitted through the protective cover glass 119, and then passes through the windshield.
The light enters the driver's eyes through an optical path 147 that is reflected on the inner surface of the light beam 07.

At this time, the virtual image produced by the head-up display 123 appears as an image at position Fa to the driver's eyes. Therefore, there is less movement of the line of sight, making it easier to confirm the displayed information.

(Problem to be solved by the invention) However, the conventional head-up display 123
Since it is installed on the vehicle instrument 125, the distance from the display element 129 to the windshield 107 is short, and the distance from the driver's eyes to the virtual image position Fa cannot be long.

Further, at this time, the virtual image position Fa has a small degree of freedom from the viewpoint of visibility, and the position of the windshield 107 is also determined by the vehicle, so it is difficult to increase the degree of freedom of the optical path 147.

Furthermore, as mentioned above, the vehicle instrument 125 and the head-up display 123 must be arranged so that they do not overlap each other, so it is difficult to increase the size of the head-up display due to the relationship with other vehicle structures. there were.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a display device for a vehicle that allows for free optical path setting and allows for an enlarged display screen.

[Configuration of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a first display means for visually displaying information related to the running of a vehicle, and a display of the first display means. Half mirror that covers the surface and this half mirror
and a second display means for projecting display light for a head-up display at a predetermined angle.

(Function) In the vehicle display device according to the present invention, information regarding the running of the vehicle is transmitted through the half mirror and visually displayed by the first display means. Further, the second display means projects display light for a head-up display at a predetermined angle onto a half mirror that covers the display surface of the first display means. The head-up display display light reflected by the half mirror is projected onto a predetermined reflective surface, such as a windshield, and is visually displayed. Therefore, it becomes possible to integrate the head-up display and the vehicle instrument, and it is possible to downsize the display device.

(Example) Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a diagram showing an embodiment of a vehicle display device of the present invention.

First, the configuration of the vehicle display device 1 of this embodiment will be explained.

The vehicle display device 1 is arranged on a dash board 5 of the vehicle 3. This vehicle display device 1 is capable of irradiating a windshield 7 with display light for a head-up display (hereinafter referred to as rHUD).

The vehicle display device 1 is shown in the perspective view of FIG.
A vehicle instrument display window] 5 is formed on the oblique side surface of the device main body 11 which has an A-line cross section or a substantially trapezoidal box shape, an optical filter 17 is attached to the display window 15, and a HUD display is provided on the upper bottom surface of the device main body 11. It has a structure in which a protective cover glass 21 is attached to one light projection window, and a protrusion 23 is provided diagonally on a part of the bottom surface of the device main body 11.

As shown in FIG. 1, the vehicle display device 1 has a vehicle instrument display element 27 fixed to a side plate 25 facing the vehicle instrument display window 15, and a vehicle instrument display element 27 fixed to a protrusion 23 at the bottom of the device body 11. The HUD display element 29 is fixed.

This vehicle instrument display element 27 has a segment configuration of light emitting elements such as light emitting diodes.
As shown in the display example in the figure, a vehicle speed value 31, engine speed 33, fuel amount 35, engine water temperature value 37, and warning light 39 can be displayed.

Furthermore, a half mirror 41 is disposed on the front surface of the vehicle instrument display element 27.

The BUD display element 29 is composed of, for example, a high-brightness fluorescent display tube, and reflects the HUD display light from the high-brightness fluorescent display tube on the half mirror 41, and then displays it on the front via the protective cover glass 21. It is arranged so that it can be projected onto the glass 7. The vehicle instrument display element 27 and HU
The display of the D front non-display element 29 is controlled by the display controller 43.

Next, the operation of the above embodiment will be explained.

The HUD display light emitted by the HUD front non-display element 29 is
The light is reflected by a half mirror 41 installed at a predetermined angle so as to exit from the protective cover glass 21, passes through the half mirror 41, is reflected by the windshield 7, and enters the driver's eyes.

On the other hand, the display light emitted from the vehicle instrument display element 27 passes through the half mirror 41 and further passes through the optical filter 17 before entering the driver's eyes.

In this embodiment, the half mirror 41 is installed in front of the vehicle instrument display element 27, and the HU
The D display light is incident on the half mirror 41 and reflected, and the reflected HUD display light is passed through the protective cover glass 2.
1 and projected onto the windshield 7.

Therefore, it becomes possible to bend the optical path 47, which is uniquely determined by the position and shape of the windshield 7, so that the virtual image position F of the HUD to be displayed is determined by the position and shape of the windshield 7. It can now be installed. Further, in the above embodiment, since the half mirror 41 is used, it is possible to install the vehicle instrument display element 27 at the lower part (back side) of the half mirror 41.

By having the configuration as described above, this embodiment can extend the length of the optical path 47, which was impossible with the conventional configuration, and
It has also become possible to expand the size of the 29 surfaces of the D front non-display element.

Furthermore, the vehicle display device of this embodiment can display the HUD display without sacrificing the instrument display.

Next, a second embodiment of the present invention will be described with reference to the sectional view of FIG.

The vehicle display device A of the second embodiment has a Fresnel lens 45 attached instead of the protective cover glass 21, and the other configurations are unchanged.

Therefore, in the embodiment of this section 2, the same reference numerals as in the first embodiment are given, and the explanation of the structure will be omitted.

This embodiment also provides the same effects as the first embodiment, and furthermore, in this embodiment, the unit shape can be made larger, and as shown in FIG. Since the optical path length of the front non-display element 29 can be made long, there is a great advantage that the HUD display can be effectively enlarged.

In other words, if the magnification rate is m, m-f/(f-l)...(1).

Here, f is the focal length of the lens, and 1 is the distance between the lens and the BUD display element 29.

The larger the focal point f, the less distortion of the image, so it is better to make the distance 1 as large as possible.

Next, a third example will be described.

The feature of this third embodiment is that the contrast of the HUD display is improved.

That is, in the third embodiment, the properties required of the half mirror 41 are that the HUD display element 29 has a good reflectance for the HUD display light, and the display element 27 for the vehicle instrument display element 27 has a good reflectance for the display light. A good rate is desirable.

Such characteristics of the half mirror 41 are as follows.
1 can be realized using techniques such as thin film coach-in. By setting the emitted light colors of the image display light elements 27 and 29 in a complementary color relationship, it becomes possible to further increase the display brightness of the image display, thereby further improving visibility.

Next, a fourth embodiment of the present invention will be described with reference to the sectional view of FIG. 5 and FIG. 6.

In the vehicle display device of the fourth embodiment, in the first embodiment or the second embodiment, light from outside the vehicle passes through the protective cover glass 21, passes through the half mirror 41, and is used for vehicle instrumentation. This is to prevent a decrease in contrast due to illumination of the display element 27.

That is, the fourth embodiment is characterized in that a light control film 49 is installed between the half mirror 41 and the vehicle instrument display element 27, as shown in FIGS. 5 and 6.

The external light Ld transmitted through the protective cover glass 21 from outside the vehicle is
The light control film 49 blocks the light.

On the other hand, the HUD display light Lh output from the HUD display element 29 is reflected on the surface of the half mirror 41.

Thereby, this embodiment can prevent the contrast of the vehicle instrument display element 27 from decreasing.

In each of the above-mentioned embodiments, since the display device is all housed within the dash board 5, there is no protrusion on the dash board unlike in the conventional device, so there is an effect that the appearance of the model is improved.

[Effects of the Invention] As described above, according to the present invention, the first display means for visually displaying information related to the running of the vehicle is provided with a half mirror that covers the display surface, and the half mirror is provided with a predetermined shape. Since the display light for the head-up display is projected at an angle, there are no protruding objects on the dash board, which improves the appearance of the design.In addition, the optical path is longer, and H
This has the effect that it is also possible to increase the dimensions of the UD display element.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a first embodiment of the present invention, Fig. 2 is a perspective view of the first embodiment, and Fig. 3 is an example of display by a vehicle instrument display element of the first embodiment. FIG. 4 is a sectional view showing the second embodiment, and FIG. 5 is a cross-sectional view showing the fourth embodiment.
FIG. 6 is a sectional view showing essential parts of the fourth embodiment, and FIG. 7 is a sectional view showing a conventional device. 1... Vehicle display device, 11... Device main body, 1
5...Vehicle instrument display window, 17...Optical filter, 19...Projection window, 23...Protrusion part,
27...Vehicle instrument display element,

Claims (1)

[Scope of Claims] A first display means for visually displaying information related to the running of the vehicle; a half mirror that covers the display surface of the first display means; and a head-up display mounted on the half mirror at a predetermined angle. A display device for a vehicle, comprising a second display means for projecting display light.