JPH0895481A - Headup display device - Google Patents

Abstract

PURPOSE: To provide a compact headup display device capable of providing a good-quality displayed picture. CONSTITUTION: In this headup display device 1, signal light beams 311 and 312 emitted from plural display means 10 and 20 are reflected by a front glass 41 so as to form a displayed picture in front of the glass 41. The device 1 is provided with the 1st display means 10 forming the displayed picture only in the range of the visual area of the left eye and the 2nd display means 20 forming the displayed picture only in the range of the visual area of the right eye. A difference is made between the displayed picture transmitted by the display means 10 and 20 and an optical path in order to easily fuse the pictures viewed by both eyes and make them have good quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-up display device for vehicles.

[0002]

2. Description of the Related Art As a device for displaying a meter or the like of an instrument panel of an automobile, as shown in FIG. 4, a signal light 31 on which an image of the meter or the like is recorded is projected onto a windshield 91 and reflected by the windshield 91. By letting the light 32 enter the eyes of the driver 92, the windshield 9
There is known a head-up display device 9 in which an image 93 is formed in front of and outside of 1 so that a driver 92 can visually recognize a meter or the like without looking away.

In FIG. 4, reference numeral 90 is a display device for transmitting a display image 93, and reference numeral 94 is a reflective optical element for reflecting the signal light 31. In addition, as another application example, as shown in FIG. 5, the display image 930 is an identification mark having a simple shape,
A vehicle tip position display device has been proposed in which the image forming position is near the tip side of the vehicle.

That is, the display image 9 emitted from the display 90
The signal light 30 recorded with 30 is reflected by the reflective optical elements 941, 9
The driver G visually recognizes the display image 930 as a virtual image by reflecting the light on the windshield 42 and the windshield 91. Then, the display image 930 can recognize the position of the front end side of the vehicle and avoid contact with an obstacle or the like (Japanese Patent Laid-Open No. 62-34).
824, etc.). In FIG. 5, point D is a reflection point of the signal light 30 on the windshield 91,
Reference numeral 95 is a control device.

[0005]

However, the conventional head-up display device has the following problems.
The first point is that the space occupied by the device becomes large. The reason is that if the display images 93 and 930 are made to be good images without distortion and blurring, the reflection optical elements 94 and 9
This is because the focal length of 42 (concave mirror) becomes large, which increases the occupied space.

The second problem is that the display images 93 and 930 are distorted or the difference between the visual images of both eyes becomes large. That is, when viewing with both eyes by the single reflective optical element 94, 942, as shown in FIG.
Light 3 reflected near the periphery of the reflective optical elements 94, 942
The image is visually recognized by 12, 313, and the displayed image is likely to be distorted.

Further, since the windshield 91 has an asymmetrical aspherical shape, a difference occurs between the visible image of the left eye and the visible image of the right eye due to the difference in the reflection position D of both eyes. In particular, since the tip position display device as shown in FIG. 5 is an oblique incidence optical system for viewing an image obliquely downward, as shown in FIG. 6, the signal light 312 directed to the left eye and the signal light directed to the right eye are shown. Light 3
The heights of the reflection points D ₁ and D _{2 on} the windshield 91 of _No. 13 are different.

Then, a difference in height occurs between the left-eye image 932 visually recognized by the left eye and the right-eye image 933 visually recognized by the right eye, which makes fusion difficult and remarkably tires the eye. Therefore, in order to eliminate such parallax between the left and right binocular images 932 and 933, a method of inserting a prism for correcting the reflection points D _{1 and} D ₂ in the optical path has been proposed (Japanese Patent Laid-Open No. 62-17333).
No. 6 publication).

However, according to this method, although the parallax between the two eyes can be corrected, the distortion due to the uneven curved surface of the windshield and the reflective optical element 94 (94).
It is impossible to correct the difference such as the distortion of the display image due to the use of the peripheral portion of 2). In view of such conventional problems, the present invention aims to provide a small-sized head-up display device capable of providing a good display image that does not cause eyestrain to a viewer.

[0010]

The present invention relates to a vehicle head-up display device for reflecting signal light on a windshield to form a display image as a virtual image in front of the windshield, wherein the signal light is transmitted to the windshield. A head-up display device is provided with a plurality of display means for radiating toward the user.

The plurality of display means may be composed of first display means for forming a display image in the visual area of the left eye and second display means for forming a display image in the visual area of the right eye. . Then, the display images formed by the respective display means can be configured so as not to be included in the viewing range of the other eye so as to separately obtain the left eye image and the right eye image. And
The first display means and the second display means may have different display images and optical paths.

[0012]

In the head-up display device according to the present invention, a plurality of display means are provided, the display means being the first display means for the left eye and the second display means for the right eye.
And display means. That is, the left eye can visually recognize the display image transmitted from the first display means, and the right eye can visually recognize the display image transmitted from the second display means. The display image from the other display means is invisible.

Since the first and second display means are independent optical systems, the transmitted display image, the optical path, etc. can be set separately, and the reflection position D on the windshield and the display images of both eyes can be set. And can be adjusted separately. Therefore, the visual images of both eyes are made into images that are easy to fuse and have a small parallax,
It allows for natural binocular vision.

That is, the heights of the reflection positions D on the windshield for the left and right eyes are made the same, and natural fusion is possible even in an oblique incidence optical system such as a tip position display device.
Moreover, the difference in distortion between the left and right images due to the uneven curved surface of the windshield can be corrected by the difference between the transmitted images. Furthermore, it is possible to easily create a stereoscopic display image with an appropriate stereoscopic effect and a sense of distance.

Further, in the case of constructing one optical system for both the left and right eyes, the peripheral portion of the optical element 94 (942) such as a concave mirror must be used as shown in FIG. In the present invention, since each optical element is used only for one eye, the signal light beams 311 and 312 pass through the central portion of the optical element as shown in FIG. Image distortion and blurring can be reduced.

Further, in the case where both eyes are constructed by one optical system, the diameter of the concave mirror is inevitably large, so that the focal length for obtaining a good image is long, but both eyes are separated. With this optical system, the diameter of each concave mirror can be reduced, and the focal length for obtaining a display image with the same image quality can be shortened.

Therefore, the entire apparatus can be downsized. As described above, according to the present invention, it is possible to provide a small-sized head-up display device capable of providing a good display image that does not cause eyestrain to a viewer.

[0018]

EXAMPLE A head-up display device according to an example of the present invention will be described with reference to FIGS. In this example, as shown in FIGS. 1 and 2, the signal lights 311 and 312 are reflected on the windshield 41 and the windshield 4
1 is a head-up display device 1 for a vehicle that forms a display image 89 (FIG. 2) as a virtual image in front of the vehicle 1, and recognizes the front end position of the vehicle. Further, two display means 10 and 20 for emitting the signal lights 311 and 312 toward the windshield 41 are provided.

The display means 10 and 20 are located within the visual range 83 of the left eye (FIG. 2) and the first display means 10 for forming the display image 89 and within the visual range 84 of the right eye (FIG. 2). And the second display means 20 for forming the above-mentioned display image 89, and each display image 89 is not formed within the visual range of the other eye.
Further, the first display means 10 and the second display means 20 are provided on a display image, an optical path, etc. which are transmitted in order to easily fuse the visual image by the left eye and the visual image by the right eye and eliminate distortion. There are differences.

Each of these will be supplementarily described below. The display means 10 and 20 include the light sources 11 and 21 and the image display mediums 12 and 2.
2 and concave mirrors 13 and 23. The light 30 emitted from the light sources 11 and 12 is transmitted through the image display mediums 12 and 22, and the concave mirror 1 is used as signal light 311 and 312 for recording the display image.
It is incident on 3,23.

The signal lights 311 and 312 are reflected by the concave mirror 1.
The recorded image is magnified at a distance by 3, 23, reflected by the windshield 41, and enters the eyes 81, 82 of the driver 80. Then, the signal light 3 emitted from the first display means 10
11 reaches the left eye 81 of the driver 80, and the signal light 312 emitted from the second display means 20 reaches the right eye 82.

Then, the driver 80 visually recognizes a display image 89 as a virtual image in front of the windshield 41 as shown by a broken line in FIG. In addition, each display means 10 or 2
The display image 89 formed by 0 is one viewing zone range 83
Alternatively, the concave mirrors 13 and 23 are arranged so as to be formed only in the inside of 84.

Further, components such as the concave mirrors 13 and 23 of the display means 10 and 20 are arranged so that the respective reflection points D ₁ and D _{2 on the} windshield 41 have the same height. Further, in order to allow the binocular visual image to be naturally binocular as a stereoscopic image, the display images transmitted by the image display media 12 and 22 are provided with a difference so as to have a parallax graphic relationship. The image display medium 1 is also used to correct the distortion of the windshield 41 and the difference in the distortion of the visual images of both eyes.
There is a difference between the display images transmitted by the reference numerals 2 and 22.

Next, the function and effect of the head-up display device of this example will be described. The windshield 41 of the display image visually recognized by the left eye and the display image visually recognized by the right eye as described above.
Since the reflection points D ₁ and D _{2 at 1} are at the same height, the images displayed by both eyes can be easily fused, and the driver 80 is not excessively tired.

Further, the display images transmitted from the image display media 12 and 22 have a parallax graphic relationship, and the driver 80 can naturally see the display images having a stereoscopic effect. Also,
The concave mirrors 13 and 23 cover only one eye, so that the aperture diameter D can be reduced.

Therefore, if the F number (= focal length / aperture) that defines the image quality is the same, the focal length f can be shortened, and therefore the concave mirrors 13 and 23 and the image display media 12 and 22 can be made smaller. The distance can be shortened and the device can be downsized. Further, if the devices have the same size and the focal length f is the same, the F number increases and the image quality improves as the aperture D decreases.

Further, as shown in FIG. 3, the signal lights 311 and 312 for forming a display image may pass through the central portions of the concave mirrors 13 and 23, and may pass through the peripheral portions as in the conventional device shown in FIG. Since it does not exist, the image quality of the display image is improved in this respect as well. As described above, according to this example, it is possible to provide the small-sized head-up display device 1 that can provide the viewer with a high-quality display image that does not cause eye fatigue.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a head-up display device according to an embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is a schematic diagram of an optical path of signal light passing through a concave mirror in the head-up display device of the embodiment.

FIG. 4 is a system configuration diagram of a conventional head-up display device.

FIG. 5 is a layout diagram of a conventional tip position display device in a vehicle.

FIG. 6 is a system configuration diagram of a conventional tip position display device.

FIG. 7 is a schematic diagram of the optical paths of the left and right signal lights passing through a concave mirror in a conventional head-up display device.

[Explanation of symbols]

 1. ． ． Head-up display device, 10. ． ． First display means, 20. ． ． Second display means, 311, 312. ． ． Signal light, 41. ． ． windshield,

Claims (3)

[Claims] 1. A head-up display device for a vehicle, which reflects signal light on a windshield to form a display image as a virtual image in front of the windshield,
A head-up display device comprising a plurality of display means for emitting the signal light toward the windshield. 2. The first display means for forming the display image in the visual range of the left eye, and the display image for forming the display image in the visual range of the right eye according to claim 1. Second
A head-up display device comprising display means, each display image being arranged so as not to form an image within the viewing range of the other eye. 3. The transmitter according to claim 2, wherein the first display means and the second display means easily fuse the visual image by the left eye and the visual image by the right eye to suppress distortion and the like. The head-up display device is characterized in that a difference is provided in a display image and an optical path.