JPH07110583B2 - Vehicle display - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle display device, and more particularly to a head-up type display device.

<< Prior Art >> Conventionally, as a head-up type display device of a vehicle, as shown in FIG. 9, for example, a light beam of a display body emitted from a fluorescent display tube 1 is provided on a windshield 3 by a mirror 2. The combiner 4 is irradiated and can be recognized by the driver's eyes 5 (see Japanese Patent Laid-Open No. 54-142748).

Therefore, the driver can see the foreground 6 and the display object in an overlapping manner.

Further, the brightness of the fluorescent display tube 1 is set to an appropriate brightness by adjusting the brightness output of the brightness control circuit 8 by operating the switch 7 by the driver, whereby a so-called multiple image is generated. It can be adjusted so that it does not occur.

<< Problems to be Solved by the Invention >> However, in the above display device, when the traveling is ended once with a certain display brightness and the vehicle travels again after a lapse of a certain time, the display with the same brightness as when the previous traveling was ended. Is displayed, when the background (foreground) brightness is high, for example, after traveling with the display brightness increased during the day, when the foreground brightness is low, for example, when traveling again in the evening, the display brightness is There was a problem that the multiple images on the display were conspicuous because they were too expensive.

<< Object of the Invention >> The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to generate a multiple image by setting the display brightness to a predetermined reference display brightness when displaying again. There is a provision of a display device for a vehicle which does not have the above.

<< Means for Solving Problems >> The present invention is configured as shown in FIG. 1 to achieve the above object.

That is, in the display means a, the display from the display is displayed on the combiner.

Further, the brightness control means b controls the display brightness of the display body.

Further, the display brightness storage means c stores the display brightness when the ignition is off.

Then, the brightness comparison means d compares the display brightness stored in the display brightness storage means c with the preset reference display brightness.

Further, when the stored display brightness exceeds the reference display brightness, the display brightness correction means e gives a brightness correction signal to the brightness control means b so that the display brightness of the display body becomes the reference display brightness when the next ignition is turned on. It is like this.

<< Operation >> With the above-described configuration, the present invention operates so that the display body is displayed at the reference display brightness or less at the time of the next ignition on, thereby preventing the occurrence of multiple images.

<< Description of Embodiments >> Hereinafter, the present invention will be described with reference to the drawings. It should be noted that the same components as those of the related art will be described with the same reference numerals.

2 to 6 show a first embodiment of the present invention, and FIG. 2 shows a schematic configuration diagram of this embodiment.

In the figure, 1 is a fluorescent display tube as a display, and 2
Is a mirror and is provided in a box 9 whose inner wall surface is dark black and whose upper wall is partially open.

That is, the fluorescent display tube 1 is provided on one side wall 1a of the box 9, and the inclination of the box 9 is such that the light beam emitted from the fluorescent display tube 1 and indicating the display body is emitted from the opening 1b of the box 9. A mirror 2 is provided on the wall 1c.

Reference numeral 4 in the drawing denotes a semi-transmissive mirror, that is, a combiner provided inside the windshield 3 of the vehicle, and the display body is projected on the surface of the combiner 4. For this reason, the display body can be recognized by the eyes 5 of the driver, and the foreground 6 can also be recognized by being superimposed through the combiner 4.

Further, 7 is a switch for changing the brightness of the fluorescent display tube 1, and the brightness output of the brightness control circuit 8 can be adjusted. Further, reference numeral 10 is an ignition key, and the on / off signal of the key is the brightness control circuit 8
It is designed to be input to.

Next, before describing the operation of the present embodiment, the generation of multiple images will be described.

The display on the combiner 4 surface does not generate multiple images,
In addition, the proper range in which the driver can recognize the contents of the display body without causing insufficient brightness is to take the road surface brightness on the horizontal axis and the display brightness on the combiner 4 on the vertical axis. It is shown as the range shown.

By the way, it can be found from FIG. 3 that the daytime road surface brightness is often in the range of 1000 to 10000 nt, and the display brightness on the combiner 4 in the proper range of this range is 700 nt. This means that the display brightness on the combiner 4 is 70
In case of 0nt, even if the road surface brightness increases from 1000 to 10,000nt,
On the contrary, even if the number is reduced from 10000nt to 1000nt, it means that the driver can recognize the contents of the display body without generating a multiple image.

Therefore, the display brightness of 700 nt on the combiner 4 is hereinafter referred to as the reference display brightness for convenience.

Furthermore, the mechanism of multiple image generation will be described with reference to FIG. 4. If the display brightness B ₀ on the combiner 4 is too high with respect to the road surface brightness Bb, the light rays of the display body that have passed through the combiner 4 will be reflected by the windshield 3. The reflected light is reflected by the outer wall surface of the lens and enters the eyes 5 of the driver to form a multiple image.

Considering multiple images based on each brightness, in the relationship between the brightness B ₀ ′ forming the multiple image and the road surface brightness Bb, the multiple image becomes conspicuous when the value of B ₀ ′ / Bb becomes large, and B ₀ ′ / When the value of Bb becomes small, multiple images become inconspicuous.

However, if the display brightness B ₀ is too smaller than the road surface brightness Bb, there is no risk of a multiple image being generated, but there is a problem that the contents of the display body are difficult to recognize. That is, if the value of B ₀ / Bb is too small, it means that the contents of the display body are difficult to see.

Therefore, the brightness control circuit 8 is designed to prevent multiple images.
The following control operation is performed. This control operation will be described with reference to the flowchart of FIG.
At, the current display brightness B is read.

Next, the ignition key is operated to determine the presence / absence of the signal, and when the ignition is on in the determination, that is, when the vehicle is moving or the engine is rotating, the current display brightness B is read as it is (No in step 102). .

However, when it is determined in step 102 that the ignition is off, that is, when the engine is stopped, it is determined whether the display brightness B at that time is the reference display brightness (700 nt) or more (step 104). In this determination, when the current brightness B is equal to or higher than the reference display brightness, for example, the current display brightness B is set so that the display brightness B ′ when the engine is restarted and the vehicle moves again becomes the reference display brightness. If it is 2000 nt, the brightness output of the fluorescent display tube when the engine is restarted is reduced, and the brightness output of the brightness control circuit 8 is adjusted so as to become the standard display brightness of 700 nt (step 106).

On the other hand, when the current display brightness B is less than the reference display brightness (No at step 104), for example, 500nt, the display brightness B'displayed when the engine is restarted is set to 500nt of the current brightness. The brightness output of the brightness control circuit 8 is adjusted so as to be displayed (step 108).

Next, in step 110, the ignition key 10 is operated to determine whether or not the signal is input, and when it is determined to restart (YES in step 110), the display brightness of the display brightness B'described above is obtained. Is displayed (Step 11
2).

That is, if the display brightness immediately before the ignition is off is 700 nt or more, as shown in FIG.
The brightness of engine restart, that is, the brightness when the ignition is turned on is 700nt, and if the display brightness just before the ignition is turned off is 700nt or less, the brightness when the ignition is turned on is controlled with the characteristic that it is displayed with that brightness. Has become.

Therefore, according to the above-described embodiment, since the display brightness when the engine is restarted is the reference display brightness or less, the occurrence of multiple images is prevented.

Another embodiment of the present invention is shown in FIGS.

This embodiment is a vehicular display device having a conventional display unit 11 in which the driver directly recognizes the display body of the display in addition to the head-up display device of the first embodiment described above.

The display brightness of the display unit 11 is the same as that of the above-described embodiment except that the display brightness is controlled by the brightness control circuit 8.

In the present embodiment, the head-up type display device is shown by the display brightness adjusted by the brightness control circuit 8 when the engine is restarted, as described in the above-mentioned embodiments. The mold display portion 11 is designed to be displayed with a predetermined constant brightness.

That is, as shown in FIG. 8, when the brightness constep is at points A and A'when the ignition is off, the head-up type display is lowered to point B when the next ignition is turned on by restarting the engine. Let the conventional display
11 remains A'point. The driver is switch 7
It is also possible to control the brightness control circuit 8 by operating to reduce the brightness constep to the points C and C '.

Of course, the brightness of the conventional display unit 11 may be changed similarly to the adjustment of the head-up type display brightness. In this case, since the display brightness changes according to the brightness ratio of the foreground, the brightness of the display unit 11 does not give excessive stimulus to the driver, and there is an advantage that driving is easy.

Although a fluorescent display tube is used as a display in this embodiment, the display is not limited to this, and a liquid crystal display, EL, or the like may be used.

<Effect> According to the present invention, when the brightness when the ignition is turned off is equal to or higher than the reference display brightness, the display brightness when the ignition is turned on is set as the reference display brightness, so that the foreground brightness is lowered and the vehicle travels again. However, the occurrence of multiple images in the display is prevented.

Therefore, the driver can accurately recognize the contents of the display,
This has the effect of making driving easier.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram, and FIGS. 2 to 6 are the first of the present invention.
FIG. 2 shows an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory view showing an appropriate range of display brightness, FIG. 4 is an explanatory view showing a multiple image generating mechanism, FIG. 5 is a flow chart showing a control flow of the brightness control circuit, and FIG. 6 is control of the control circuit. FIG. 7 is a characteristic diagram, FIG. 7 and FIG. 8 show another embodiment of the present invention, FIG. 7 is a schematic configuration diagram thereof, FIG. FIG. 1 is a schematic configuration diagram of a conventional head-up type display device. 1 …… Fluorescent display tube 2 …… Mirror 3 …… Windshield 4 …… Combiner 7 …… Switch 8 …… Brightness control circuit 10 …… Ignition key a …… Display means b …… Brightness control means c …… Display brightness Storage means d ... Brightness comparison means e ... Display brightness correction means

Claims (1)

[Claims] 1. Display means for displaying a display body from a display on a combiner, brightness control means for controlling display brightness of the display body, display brightness storage means for storing display brightness when the ignition is off, and storage. Brightness comparison means for comparing the displayed display brightness with a preset reference display brightness, and when the stored display brightness exceeds the reference display brightness, the display brightness of the display body is set as the reference display brightness when the next ignition is turned on. And a display brightness correction unit that applies a brightness correction signal to the brightness control unit so that the display device for a vehicle is provided.