JPS61211139A - Display device for car - Google Patents

Abstract

PURPOSE:To call a driver's attention more effectively even though a display uses only a single display color, by changing display colors of the display image of the driving information displayed in the field of view of the front glass, when the driving information comes to a specific condition. CONSTITUTION:In an ordinary running, the data '70m' of a distance to a car ahead, for example, is displayed in a green color, so that a driver can see the data through the front glass 1 over the foreground 5 by his eye 6. In this case, whether the car distance detected by a distance sensor 8 is within a safety distance or not, depending on the car speed, is decided by an estimate circuit 9, and if shorter than the safety distance, a warning signal is output, causing an on-and-off signal to be output from a driving circuit 10, and a red lamp 23 is turned on and off. In that, the green light passed from a fluorescent character display tube 21 through a reflecting membrane mirror 22, together with the red light illuminated from the red lamp 23 and reflected by the reflecting membrane mirror 22, is focused into an image in front of the outside of the front glass 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a display device for a vehicle that can improve the ability of a driving information display image displayed within a driver's visual field to attract attention.

(Prior art) Driving information such as vehicle speed, mileage, inter-vehicle distance, remaining fuel level, or time has traditionally been displayed using a meter or clock installed on the instrument panel, but recently drivers have been unable to view this information. In order to avoid the need to take one's eyes away from the front field of vision, a display device has been developed that focuses this driving information on the outside of the windshield in the front field of view so that it overlaps with the foreground in the field of view. (For example, Japanese Patent Laid-Open No. 57-182541) and is called a head amplifier display device.

Usually, many of these types of display devices display driving information in a single display color such as green, so if the vehicle speed exceeds the speed limit, the following distance is within the limit distance, or the remaining fuel level is It is necessary to warn the driver when the amount decreases to below, and possible ways to do this include sounding a buzzer or changing the color of the display using a color display. However, since this type of display device is mounted on the instrument panel along with other meters and many display sections, it is desirable to minimize the dedicated space and depth, but color displays use cathode ray tubes. Therefore, the depth cannot be made small and a high brightness light source is required.
There are problems such as being expensive, and it is difficult to adopt due to ease of wear, weight, and cost.

(Object and structure of the invention) The present invention has been made in view of the above points, and an object of the present invention is to improve the attention-grabbing power of a driving information display image displayed within the field of view of a windshield with a simple and inexpensive structure. In order to achieve this purpose, a light emitting means that emits light in a color different from that of the driving information display or a second driving that displays the same driving information in a color different from that of the driving information display is provided. An information display is provided, and a selective reflection film is provided that allows the display light from the driving information display to pass through, but reflects the display light from the light emitting means or the second driving information display, so that the driving information is displayed in a predetermined manner. When the above condition is satisfied, the light emitting means or the second driving information display device is driven to change the display color of the driving information imaged on the outside front of the windshield.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 is a schematic diagram of one embodiment of a vehicle display device according to the present invention, and the illustrated example digitally displays the distance between the vehicle and the preceding vehicle in meters.
1 is the windshield, 2 is the driving information display image projector,
A green fluorescent display tube 21 that displays driving information, a selective reflection film mirror 22 that has a high reflectance only for light of a specific wavelength, and a reddish color of the display image to increase the attention-grabbing ability of the display. It is constructed by arranging a red lamp 23 for changing the color to a dark color, a light projection lens 24, and a total reflection mirror 25 in a case 26. 1 constitutes an optical projection means. 3 is a transparent plate, 4 is a display image of driving information formed on the front outside of the windshield 1, 5 is a foreground, 6 is a driver's eyes, and 7 is a steering wheel.

FIG. 2 shows the structure of the reflective film mirror 22 shown in FIG. 1, where 22a is a 0.8-thick float glass;
b is about 2000 people thick! 0□ (titanium oxide) thin film, 22C is about 2500 people thick, F□ (calcium fluoride) thin film, 22d is about 500 people thick 5hot (
silicon oxide) FjIl! J and 22e are thin films of C and F, and these thin films 22b to 22e are formed in a vapor deposition process.Increasing the number of Fil film layers will improve the reflection characteristics of the mirror, i.e., for light of a specific wavelength. However, the number of layers is usually 3 to 6.

Figure 3 shows an example of the reflectance and transmittance characteristics of this reflective film mirror.
It is a reflective film mirror that has a high reflectance (approximately 30%) at wavelengths of 30 nm and low reflectance for other wavelength components. This reflective film mirror has a main wavelength of 520 nm for the green fluorescent display tube.
The transmittance is sufficiently high (approximately 85%).

FIG. 4 is a block diagram of the electric circuit of the vehicle display device according to the present invention, where 8 is a distance sensor using ultrasonic waves or radio waves, and 9 is a comparison between the distance between vehicles and the safe distance between vehicles, which is determined according to the vehicle speed. IO is a drive circuit that outputs a flashing signal in response to the warning signal; and 23 is the red lamp shown in FIG. 1.

Now, during normal driving, as shown in Figure 1, the following distance information "70m" is displayed in green, and the driver sees this information through the windshield L and superimposes it on the foreground 5 with his/her eyes 6. You can see it. A judgment circuit 9 determines whether the inter-vehicle distance currently detected by the inter-vehicle distance sensor 8 is within a safe inter-vehicle distance determined according to the vehicle speed, and if it is within the safe inter-vehicle distance, a warning signal is output. As a result, a blinking signal is output from the drive circuit 10, and the red pump 2
3 flashes. As a result, the green light from the fluorescent display tube 21 passes through the reflective film mirror 22, and together with the red light emitted from the red lamp 23 and reflected by the reflective film mirror 22, the green light passes through the lens 24. The color of the display image that is projected through the total reflection mirror 25 and formed on the outside front of the windshield 1 changes to a reddish color as a whole, and the reddish color is different from the red lamp 2.
It appears and disappears depending on the blinking number 3. This calls attention to the displayed image.

FIG. 5 is a schematic diagram of another embodiment of the display device according to the present invention, in which vehicle speed is displayed as driving information, and the same reference numerals as in FIG. 1 indicate the same components.

In this embodiment, a first vehicle speed indicator is installed in the projector 2.
The green fluorescent display tube 21a and the second
are arranged symmetrically with respect to the red fluorescent display tube 21b and the selective reflection film mirror 22 as the driving information display of the
The display patterns of the image display tubes 21a and 21b are arranged so that the left and right sides are reversed so that they are mirror images. In addition, a light projection lens 24, a total reflection mirror 25. This embodiment is the same as the embodiment shown in FIG. 1 in that the windshield 1 constitutes the optical projection means.

When the vehicle speed is, for example, 1100 km/hour or less, only the green fluorescent display tube 21a is turned on, and a speed display of 70 km/h, for example, 7 o'clock is displayed in green on the outside of the windshield. However, when the vehicle speed exceeds 1100 k/hour, the green fluorescent display tube 21a is turned off and the red fluorescent display tube 21b is turned on by a drive circuit (not shown), and the vehicle speed display color changes from green to red.

The display color of the vehicle speed may suddenly change from green to red at 1100 k/hour as described above, or
When the speed exceeds 90km/hour, the color gradually changes from green to red.
It may be controlled so that the color becomes completely red when the speed exceeds 1100 k/hour.

(Effects of the Invention) As explained above, in the present invention, the display color of the display image of driving information displayed within the field of view of the windshield is changed when the driving information meets a predetermined condition. Therefore, even if a display with a single display color is used, it is possible to increase the ability to attract the driver's attention and to reliably convey warnings and warnings, which is preferable for safe driving.Additionally, by changing the display color, freedom in display design can be achieved. You can increase the degree.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a vehicle display device according to the present invention, FIG. 2 is a cross-sectional structural diagram of a reflective film mirror used in the embodiment shown in FIG. 1, and FIG. 3 is a schematic diagram of a reflective film mirror used in the embodiment shown in FIG. FIG. 4 is a block diagram of an electric circuit of the vehicle display device according to the present invention, and FIG. 5 is a schematic diagram of another embodiment of the vehicle display device according to the present invention. l...Windshield, 2...Projector, 21 River edge color fluorescent display tube, 22...Reflection film mirror, 23...Red lamp, 24...Light projection lens, 25...Total reflection Mirror, 26...Case, 4...Driving information display image, 5.
...Foreground, 6...Driver's eyes.

Claims (2)

[Claims] (1) A driving information display, a light emitting means that emits a color different from the display color of the driving information display when the driving information satisfies a predetermined condition, and a driving information display light from the driving information display. It is characterized by comprising a selective reflection film that allows light from the light emitting means to pass through but reflects it, and an optical projection means that images the driving information displayed on the driving information display outside and in front of the windshield. Vehicle display device. (2) A first driving information display, and when the driving information satisfies a predetermined condition, a display color different from that of the first driving information display, but the same operation as the first driving information display; a second driving information display for displaying information; and a selective system that allows driving information display light from the first driving information display to pass through but reflects driving information display light from the second driving information display. A display device for a vehicle, comprising: a reflective film; and an optical projection means for forming an image of the driving information displayed on the first or second driving information display device on the outside of the windshield.