JPS62268742A - Display device for vehicle - Google Patents

Abstract

PURPOSE:To improve the visibility of a display image by forming a louver shielding the incoming light parallel with the incident display light to a combiner but not shielding the visual field of a driver on the surface of the combiner where the incoming light strikes. CONSTITUTION:The driving information display light leaving a display body 9 is reflected by a plane mirror 10, is expanded by a concave mirror 11, then is reflected by a combiner 2 and enters the eyes 3 of a driver, and forms a display image 5 in front of a front glass 1. At this time, the eyes 3 of the driver are located within the angle theta1, thus the driver can see the display image 5 a foreground 6 superposed. On the other hand, when the sun 7 is located at a high position and the incoming light parallel with the incident display light to the combiner 2 strikes the combiner 2 within the angle theta2, the incoming light is shielded by a louver 14. Accordingly, the incoming light does not enter a projector 4 and is not concentrated to the display body 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle display device that displays driving information within a driver's field of vision.

(Prior technology) Previously, driving information such as vehicle speed, mileage, inter-vehicle distance, engine speed, remaining fuel level, and various warnings were displayed on meters installed on the instrument panel, or recently drivers have been viewing this information. In order to avoid the need to turn your mouth away from the front field of view, this driving information is reflected on the windshield and formed into an image within the front field of view of the vehicle.
A display device that overlaps the foreground within the field of view has been considered (for example, Japanese Patent Application Laid-Open No. 57-18254).
No. 1), this device is called a head-up display device.

FIG. 3 is a schematic cross-sectional view of a conventional vehicle display device.
is a windshield, 2 is a combiner made of a transparent reflector, 3 is the driver's eyes, 4 is a projector that projects continuous information display light onto the combiner 2, 5 is a display image formed in front of the windshield l, 6 is a In the foreground, 7 is the sun. The projector 4 includes a case 8, a display 9 such as a fluorescent display tube or LED for displaying operating information, a plane mirror 10, a concave mirror 11, and a transparent plate 1 provided at the opening of the case 8.
2 and a light shielding plate 13. The display light emitted from the display body 9 is reflected by a plane mirror 10, magnified by a concave mirror 11, reflected by a combiner 2, and enters the driver's eyes 3. Therefore, the display image 5 is formed as a virtual image in front of the vehicle, and the foreground 6
It overlaps with the driver's eye 3 and can be seen. In order to form the display image 5 at a distance, the display body 9 is usually placed at approximately the focal point of the concave mirror 11.

By the way, the external light from the sun 7 that enters through the transparent plate 12 is largely blocked by the light shielding plate 13, or the sunlight from the center L is blocked by the light shielding plate 13 and placed above the light shielding flaw indicator 9. The light is focused on a portion of the display body 9 other than the display portion and is reflected. Therefore, the display light from the display body 9 is canceled by the reflected light, which not only significantly reduces the visibility of the display image 5, but also poses a risk that the display body 9 may be damaged by heat.

According to experimental data, a fluorescent display tube is used as the display body 9,
It has been found that even if the concave mirror 11 is installed at a slightly out-of-focus position, the temperature of the fluorescent display tube becomes 20 to 30 degrees Celsius higher than the ambient temperature within a few minutes.

(Objective 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 prevent a decrease in visibility of a display image and heat damage to a display body due to external light. In order to achieve this goal, a louver is formed on the surface of the combiner where the external light enters, and the louver blocks external light that is parallel to the display light that enters the combiner, allowing the external light to enter the driving information display body. It was configured so as not to collect light.

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

FIG. 1 is a schematic cross-sectional view of one embodiment of a vehicle display device according to the present invention, in which the same reference numerals are given to the rotating components as in FIG. 3.

In the figure, 2 is a combiner, and a louver 14 is formed integrally with the combiner 2 on the surface into which external light from the sun 7 enters. As shown in the enlarged sectional view of the combiner 2 in FIG. 2, the louver 14 includes a plurality of louver pieces 14a and a transparent resin 14 that fills the gap between the louver pieces 14a and prevents clogging.
It consists of b. In FIG. 2, corner 01 indicates a range through which external light from the sun 7 passes, and corner 02 indicates a range where external light is blocked. The combiner 2 adjusts its inclination so that it is within the range of the angle 0, which is the position of the driver's eyes 3, so as not to block the driver's field of view, and to prevent the display light from the projector 4 and external light parallel to it from blocking the driver's field of view. Angle 0
It is installed so that the incident light falls within the range of □.

With the above configuration, the driving information display light emitted from the display body 9 is first reflected by the plane mirror lO, magnified by the concave mirror 11, reflected by the combiner 2, enters the driver's eyes 3, and is reflected in front of the windshield l. A display image 5 is formed on. Since the driver's eyes 3 are within the corner 01, the driver can see the displayed image 5 from the foreground 6.

On the other hand, when the sun 7 is at a high position and external light parallel to the display light entering the combiner 2 enters the combiner 2 within the range of the angle 02, the outside light is blocked by the louver 14. Therefore, external light does not enter the projector 4 and is not focused on the display 9. Therefore, the visibility of the displayed image 5 is not reduced, and the display body 9 is not damaged by heat.

Note that even if the sun 7 is at a low position and external light enters the combiner outside the range of the angle 02, the light will not be focused on the display body 9 because it is originally off the optical axis of the display light.

In the above embodiment, a dedicated combiner is provided to display driving information, but the present invention is not limited to this, and a windshield may be used as a combiner instead.

In addition, in the above embodiment, the louver is formed integrally with the combiner, or I:1. A louver made of aluminum may be attached to the surface of the combiner. The shape of the louver is not particularly limited, and any of the lattice-type louvers shown in FIG. 3(A), the hexagonal-type louvers shown in FIG.

(Effect of the invention) As explained above, in the present invention, the combiner
A louver is formed on the surface where the second external light enters, and the louver allows the external light parallel to the display light to enter the combiner. Therefore, the visibility of the displayed image can be improved without concentrating external light on the driving information display body, and it is possible to prevent heat damage to the display body.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an embodiment of a vehicle display device according to the present invention, FIG. 2 is an enlarged sectional view of a combiner used in the vehicle display device of FIG. 1, and FIGS. 3(a) and (b). ,(c)
4 is a perspective view of a louver having a different shape, and FIG. 4 is a schematic cross-sectional view of a conventional vehicle display device. l...windshield, 2...combiner, 3...
- Driver's eyes, 4... Projector, 5... Display image, 9... Display body, 11... Concave mirror, 12-...
Transparent plate, 13... Light shielding plate, 14... Louver Patent applicant Nissan Motor Co., Ltd. Agent Patent attorney Hiroshi Suzuki So1 Figure 1 11'3 Figure 2 Figure 3 (B) Figure 4

Claims (1)

[Claims] In a vehicle display device that reflects display light from a driving information display body with a combiner to form an image of driving information on the outside front of the windshield and displays the driving information, a surface of the combiner on which external light enters is provided with a A vehicle display device characterized by forming a louver that blocks external light parallel to incident display light but does not block the driver's field of view.