JPH05147456A - Display device for vehicle - Google Patents

Abstract

PURPOSE:To allow a driver to observe a display image suitable for the traveling speed of a vehicle by changing the image focus position of the display image and the shape of the display image corresponding to the position, according to the traveling speed of the vehicle in a display device for vehicle which focuses the display image as a virtual image in front of the vehicle. CONSTITUTION:A display unit 1 which is equipped with a luminous type display device 2 and an optical member 3 such as lens and mirror is embedded inside the dashpot 4 of a vehicle 6. The display light beam L supplied from the display unit 1 is Reflected to a driver 8 side by a combiner 5 installed on the inside surface of a front glass 7. The driver 8 observes the display image X in superposition to the scenery 9 by the display light beam L. The distance between the display device 2 and the optical member 3 is varied according to the increase of the traveling speed of the vehicle 6 by a position adjusting means 12, and the image focus position of the display image X is shifted to the far position. Further, the display device 2 is controlled according to the image focus position by a shape adjusting means 13, and the shape of the display image X is reduced.

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 forming a virtual image of vehicle driving information in front of a vehicle.

[0002]

2. Description of the Related Art A dashboard is provided with a display unit for emitting driving information such as traveling speed as a light beam and a display unit equipped with optical members such as a lens for forming the light beam as a display image of a desired size at a desired position. And irradiate the light beam to a combiner provided on the inner surface of the windshield, so that the desired position in front of the vehicle (for example, the driver's 2
A display device for forming a display image in front of a scene in front of m is called a head-up display and is well known (see, for example, Japanese Utility Model Laid-Open Nos. 1-123731 and 3-88928).

This display device excels in readability because it requires less movement of the driver's line of sight than a combination meter which is a conventional pointer direct reading type instrument.

[0004]

However, the focus of the driver's eyes moves far away as the traveling speed increases. For this reason, when the display image is fixed at the predetermined position, the driver must alternately compare the distant landscape and the nearby display image, which is a great fatigue.

Further, the driver's visual field becomes narrower as the traveling speed increases. Therefore, when the display image is fixed at the predetermined size, the occupation ratio of the display image with respect to the driver's field of view becomes large, which is annoying to the driver.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been conceived by focusing on the above-mentioned conventional inconvenience, and in a vehicular display device for forming a display image as a virtual image in front of a vehicle, the display image The position adjusting means for changing the image forming position of the display image and the shape adjusting means for changing the shape of the display image according to the image forming position of the display image are included in the display according to the traveling speed of the vehicle. It is an object of the present invention to provide a vehicle display device capable of changing the image forming position and the shape of the display image according to this position.

[0007]

If the image forming position and the shape of the display image are changed according to the traveling speed, the display image suitable for the traveling speed of the vehicle can be obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which reference numeral 1 denotes a light emitting display 2, which is composed of a dot display type liquid crystal element with a back light, the position of which can be changed in the front and rear directions by a structure described later.
The display unit includes an optical member 3 such as a lens and a mirror, and is embedded inside the dashboard 4.

Reference numeral 5 denotes a semi-transmissive reflection type combiner provided on the inner surface of the windshield 7 of the vehicle 6 so as to reflect the display light beam L from the display unit 1 to the driver 8 side.

The display unit 1 determines the image forming position and shape of the display image X formed in front of the vehicle 6 by the display light L emitted to the combiner 5 so as to be superimposed on the landscape 9 and the traveling speed of the vehicle 6 or the driver. It is configured to be changed by the operation of 8.

Specifically, as shown in FIG. 1, the speed signal of the speed sensor 10 is output to the determination circuit 11, and it is determined that the traveling speed has reached the set speed of the determination circuit 11 as the traveling speed increases. Then, the determination circuit 11 causes the position adjusting means 12 such as a motor to operate.
Is controlled to move the display 2 to a predetermined position to change the image forming position of the display image X to a distant position, and to control the shape adjusting means 13 such as a liquid crystal driving IC to control the shape of the display image X per character normally. The display is switched small from 5 × 7 dots (FIG. 3) to 4 × 6 dots (FIG. 4) and 3 × 5 dots (FIG. 5).

According to this structure, as the traveling speed of the vehicle 6 increases, the image formation position of the display image X becomes farther from the driver 8, and at the same time, the shape of the display image X becomes smaller. A suitable display image X can be obtained.

As a matter of course, the control opposite to the above is performed with the decrease of the traveling speed, but in order to suppress the frequent control due to the variation of the traveling speed near the set speed,
It is desirable to provide the determination circuit 11 with hysteresis.

FIG. 2 shows another embodiment of the present invention,
Instead of the determination circuit 11 performing the above-mentioned control according to the speed signal from the speed sensor 10, a manual switching means 14 such as an adjusting volume is used so that the operation is performed by the driver 8.

In each of the above-described embodiments, a display device called a so-called head-up display has been described, but even if the display device does not overlap the display image X with the landscape 9, the driving information is used as the virtual display image X of the vehicle. As long as the image is formed in front of 6, the same operation can be obtained with the same configuration as each of the above embodiments.

[0016]

According to the present invention, in a vehicular display device for forming a display image, which is driving information, as a virtual image in front of a vehicle, the image formation position of the display image and the image formation position of the display image according to the traveling speed of the vehicle. It is characterized in that the shape of the display image can be changed according to the traveling speed of the vehicle, and the image forming position and the shape of the display image can be changed according to the traveling speed of the vehicle. A display image can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a display example of a display image according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing another display example of the display image in the embodiment.

FIG. 5 is an explanatory view showing still another display example of the display image in the embodiment.

[Explanation of reference numerals] 1 display unit 2 indicator 3 optical member 4 dashboard 5 combiner 6 vehicle 8 driver 12 position adjusting means 13 shape adjusting means L display ray X display image

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Nakashizu 190-1 Fukuda-cho, Nagaoka-shi, Niigata Nihon Seiki Co., Ltd. R & D Center

Claims (1)

[Claims] 1. A vehicle display device for forming a display image as a virtual image in front of a vehicle, the position adjusting means for changing an image forming position of the display image, and the position adjusting means for changing the image forming position of the display image. A display device for a vehicle, comprising: a shape adjusting unit that changes a shape of a display image.