JP2853389B2 - 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 so-called head-up display (HUD) for projecting and displaying vehicle information on a windshield of a vehicle.

[0002]

2. Description of the Related Art As a conventional head-up display (hereinafter, referred to as HUD), for example, Japanese Utility Model Laid-Open No. 61-1
There is one shown in Japanese Patent No. 2834. This kind of HU
D is provided with a projection device for projecting vehicle information such as vehicle speed toward a windshield of the vehicle, and displays vehicle information by visually recognizing an image reflected by the windshield by a driver or the like.

[0003]

However, in the conventional HUD, the display of the vehicle information sometimes appears double on the windshield. That is, as shown in FIG. 4, almost all of the light 1 emitted from the HUD projector is reflected by the front surface 2a of the windshield 2 and reaches the driver 3, and is projected to the driver 3 in front of the reflection portion. A virtual image of the light 1 from the device can be seen, and the light 1 ′ transmitted through the windshield 2 and reflected on the back surface 2 b thereof reaches the driver 3 though the amount of light is small, and also from the projection device in front of this reflection portion. A virtual image of light 1 'is visible. In this way, the driver 3 can see the image shifted up and down on the windshield 2 twice.

FIG. 5 is a diagram showing an example of an image which appears double to the driver according to the principle shown in FIG. In FIG. 5, 4
Is a main display for displaying the vehicle speed itself, and 5 is a sub-display for displaying the unit of the vehicle speed, and images 4a and 5a reflected on the front surface 2a of the windshield 2 and an image 4b reflected on the back surface 2b of the windshield 2 respectively. , 5b appear double. Since the main display 4 for displaying the vehicle speed and the like is displayed relatively large, even if the images 4a and 4b are projected doubly, there is little overlap because there are many overlapping portions. Since the image is displayed smaller than the main display unit 4, the image 5
When a and 5b are double-projected, the images 5a and 5b are displayed apart and they appear to form separate images. As described above, the problem that the light beams 1 and 1 ′ from the projection device appear doubly on the windshield 2 appears particularly prominently in the sub display unit 5.

An object of the present invention is to provide a vehicle display device capable of improving the visibility of a display section for vehicle information.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2 showing one embodiment, the present invention projects vehicle information on a windshield 14 and outputs the vehicle information to the windshield 14.
The present invention is applied to the vehicle display device 11 that displays vehicle information by allowing the occupant 20 to visually recognize the image reflected by the vehicle. The objective of the above, Bei the main display unit 16 for displaying the main display information of the vehicle information, smaller display area than the main display unit, and a sub-display section 17 for displaying the sub-display information of the vehicle information
When the vehicle is running, the sub display is lower than the main display.
Display with brightness, while the vehicle is stopped, the main display unit and the
This is achieved by displaying the sub-display section at low luminance .

[0007]

[Function] Do not pay close attention to the indication on the windshield.
When the vehicle is traveling, the vehicle information of only the sub-display unit 17 is displayed at a lower brightness than the main display unit 16, so that the image of the sub-display reflected by the windshield 14 and visually recognized by the occupant 20 is the main display. The brightness becomes lower. Moreover, the amount of light reflected on the back surface of the image is smaller than the amount of light reflected on the front surface of the windshield 14, and accordingly,
The double display of the secondary display while the vehicle is running becomes less noticeable as a whole. When the vehicle is stopped, both the main display and the sub display
Main display of vehicle information because it is more likely to be viewed
Both the display unit and the sub display unit display at low luminance. This
The main table where the degree of double reflection is not so large
Although it is a display part, even if it becomes
I do not stand out.

[0008] In the means and means for solving the above-mentioned problems which explain the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0009]

【Example】

<Embodiment> FIG. 1 shows a vehicle display device (H) according to the present invention.
FIG. 4 is a cross-sectional view showing a state in which one embodiment (UD) is attached to a vehicle. In FIG. 1, reference numeral 10 denotes a dashboard of a vehicle.
D11 is embedded. The HUD 11 is a display device 1 that emits and displays the vehicle speed as light 13 in letters and numbers.
2, a reflecting mirror 15 provided on the optical path of the display device 12 for directing the light 13 emitted from the display device to the windshield 14, and forming an image of the light reflected by the reflecting mirror 15 on the windshield 14. And a lens 19 to be used.

As shown in FIG. 2, the display device 12 includes a main display section 16 having a fluorescent display tube for displaying a number indicating a vehicle speed (main display information of vehicle information), and a unit of vehicle speed (sub-display of vehicle information). Information display), a sub-display unit 17 having a fluorescent display tube for displaying characters indicating “information”, the main display unit 16 and the sub-display unit 1.
7 and a drive control circuit 18 for controlling the luminance.

The drive control circuit 18 reduces the luminance of the light emitted from the sub display unit 17 by reducing the filament voltage applied to the sub display unit 17. The rate of decrease in luminance can be adjusted by, for example, providing a luminance adjusting resistor for dividing the filament voltage in the drive control circuit 18 and appropriately changing the resistance value. In this embodiment, the luminance is set to about half of the luminance of the main display unit 16.

In the above configuration, the display device 12
The light 13 emitted from the (main display unit 16 and the sub display unit 17) and representing the vehicle speed as characters and numerals is directed to the windshield 14 by the reflecting mirror 14.
4 and reaches the driver 20. Then, when the driver 20 sees a virtual image 21 of the light 13 from the display device 12 in front of the reflection portion of the windshield 14, characters and numerals indicating the vehicle speed are visually recognized by the driver 20.

At this time, in this embodiment, the luminance of the light emitted from the sub-display unit 17 is set to about half of the luminance of the main display unit 16, so that
The brightness of the entire sub display reflected on the windshield 14 decreases,
Moreover, the image reflected on the back surface of the windshield 14 (FIG. 5)
Since the image 5b) has a smaller light amount than the image reflected on the surface of the windshield 14, the windshield 1
(4) The image reflected on the back surface becomes less noticeable as a whole, and the visibility of the sub display by the sub display unit 17 is improved.

Incidentally, in the correspondence between the claims and the embodiment, the HUD 11 constitutes a vehicle display device, and the driver 20 constitutes a passenger.

<Modification of One Embodiment> In the above-described embodiment, the filament voltage of the sub-display unit 17 is adjusted to make the luminance about half, but the light emission luminance of the display unit itself is made the same. A similar effect can be obtained even if a dimming filter is attached in front of the sub display unit 17.

Further, in one embodiment, the brightness of the sub-display unit 17 is always lower than the brightness of the main display unit 16. Then, a vehicle speed signal is input to the drive control circuit 18 described above, and during driving, only the brightness of the sub display unit 17 is reduced.
When the drive control circuit 18 detects that the vehicle has stopped, the main display unit 16
Alternatively, the luminance of the sub display unit 17 may be reduced. Alternatively, in consideration of the fact that the image reflected on the back surface of the windshield is more conspicuous in the night than in the day, it is possible to detect that the light switch is turned on and lower the luminance of the sub display unit 17.

Further, in one embodiment, the main display section 16 displays a number indicating the vehicle speed, and the sub-display section 17 displays characters indicating the unit of the vehicle speed. The vehicle information to be performed is not limited to this. As an example, FIG.
As shown in the figure, the main display unit 16 displays a number 30 indicating the vehicle speed,
The sub display unit 17 can also display a character 31 indicating a unit of vehicle speed, a symbol 32 indicating a remaining fuel amount, a numeral 33, and the like.

[0018]

As described in detail above, according to the present invention, particularly, the display reflected on the windshield is not so closely watched.
When the vehicle is not running, the brightness of the sub-display information is lower than the brightness of the main display information, so that the image of the sub-display display portion reflected on the back surface of the windshield becomes inconspicuous as a whole and the sub-display is visually recognized. It has an excellent effect that the property is improved. In addition, when the vehicle is stopped, the main display section also displays
Is more likely to be watched, but in this case the vehicle information
Is displayed at low brightness on both the main display and the sub-display.
The degree of conspicuous double projection is large
Not only does the double display of the sub-display part become inconspicuous,
The main display part where the degree of conspicuousness is not so large is
It is said that double projection is not noticeable even when it comes to be watched
It works. As a result, even if the vehicle is running, it stops
Even in the middle, the double projection of the entire display section becomes inconspicuous.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a vehicle display device according to an embodiment of the present invention is mounted on a vehicle.

FIG. 2 is a schematic diagram showing a main display unit and a sub display unit.

FIG. 3 is a schematic view showing another embodiment of the vehicle display device.

FIG. 4 is a diagram showing a reflection state of light rays on a windshield.

FIG. 5 is a diagram showing an image visually recognized by a driver on a conventional vehicle display device.

[Explanation of symbols]

 Reference Signs List 11 head-up display 12 display device 13 light 14 windshield 15 reflector 16 main display unit 17 sub-display unit 18 drive control circuit 19 lens 20 driver

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-111542 (JP, A) JP-A-62-50239 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60K 35/00 G02B 27/02 G09F 9/00 359

Claims (1)

(57) [Claims] 1. A vehicle display device for projecting vehicle information on a windshield and displaying vehicle information by a passenger visually recognizing an image reflected by the windshield, wherein main display information of the vehicle information is displayed. A main display unit, comprising a sub-display unit having a smaller display area than the main display unit and displaying sub-display information of the vehicle information, wherein the sub-display unit has lower brightness than the main display unit during traveling of the vehicle.
The main display and the sub-table are displayed while the vehicle is stopped.
A display device for a vehicle, characterized in that both display portions are displayed with low brightness.