JP2020086205A - Head-up display device - Google Patents

Abstract

To provide a head-up display device that can be easily downsized by suppressing the volume of display means.SOLUTION: A head-up display device 11 projects display light L to a front windshield 12 of a vehicle, generates a virtual image V with the display light L reflected to the front windshield 12 by superposition on an actual scene transmitted through the front windshield 12, and displays the virtual image. Display means 15 for emitting the display light L includes: a display unit 19 that is controlled by a control part 18 to emit light; a collimating optical system 20 through which the emitted light from the display unit 19 is transmitted; a light guide 21; a deflection part 22; and a diffuser panel 23.SELECTED DRAWING: Figure 1

Description

The present invention relates to a head-up display device that displays a virtual image on a front windshield, a combiner or the like of a vehicle.

A head-up display device that superimposes on a real scene (scenery in front of the vehicle) that passes through a reflective translucent member such as a front windshield or a combiner of a vehicle, and generates and displays a virtual image by the display light reflected by the reflective transmissive member. Contributes to safe and comfortable vehicle operation by providing the information desired by the viewer in the form of a virtual image while suppressing the line of sight of the viewer driving the vehicle as much as possible.

For example, the head-up display device described in Patent Document 1 is provided on a dashboard of a vehicle to project display light on a front windshield, and display light reflected by the front windshield provides a virtual image to a viewer on a virtual image display surface. To be visible. In the patent document, a first virtual image is present on a first virtual image display surface that is substantially parallel to a road surface on which the vehicle is traveling, and a second virtual image display surface that is substantially parallel to a direction perpendicular to the traveling direction of the vehicle. The second virtual image is displayed so as to form a predetermined angle.

JP, 2016-212338, A

By the way, although the head-up display device described in Patent Document 1 displays two virtual images, a simpler configuration for displaying one virtual image will be described with reference to FIG. 1 is provided inside a dashboard 4 in which a cover glass 3 located below a front windshield 2 of a vehicle is formed, and includes a display unit 5, a folding mirror 6, a concave mirror 7, and a control unit 8. ..

Like the first image display unit and the second image display unit of Patent Document 1, the display unit 5 is composed of a projector and is controlled by the control unit 8 to project light, and the projection unit 9 projects the light. A screen 10 that receives light and emits display light L including an image toward the folding mirror 6. The display light L from the display means 5 is reflected by the folding mirror 6 and the concave mirror 7, passes through the cover glass 3, and is projected on the front windshield 2. The display light L projected on the front windshield 2 is reflected by the viewer (generally, the driver of the vehicle) D, generates a virtual image V, and is superimposed on the real scene that passes through the front windshield 2 to the viewer. Display on D.

However, in the head-up display device 1, since it is necessary to provide a constant space between the projection unit 9 and the screen 10, the volume of the display means 5 becomes large, and it is difficult to downsize the head-up display device as a whole. There was a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a head-up display device in which the volume of the display unit is suppressed and the size can be easily reduced.

In order to solve the above-mentioned problems, the present invention projects display light onto a reflective translucent member provided in a vehicle, and displays the reflected light on the reflective translucent member so as to be superimposed on a real scene transmitted through the reflective translucent member. A head-up display device for generating and displaying a virtual image by light, wherein display means for emitting the display light is controlled by a control unit to emit light, and light emitted from the display passes through. It is characterized by comprising a collimating optical system, a light guide, a deflecting section and a diffusing member.

It is preferable that the collimating optical system, the light guide, the deflecting unit, and the diffusing member are arranged in this order so that the light emitted from the display device passes therethrough.

Further, it is preferable that the display device is a projector or a micro LED display, and the deflecting unit includes a plurality of masks having holes at predetermined intervals so that the emitted light of the deflecting unit is emitted from one virtual point. It is preferable that they are combined.

According to the head-up display device of the present invention, the volume of the display means is suppressed, and the head-up display device can be easily downsized.

It is an explanatory view showing a head-up display device concerning a mode for carrying out the invention. FIG. 1A is a side view showing a display means of the head-up display device of FIG. 1, and FIG. It is explanatory drawing which shows the deflection|deviation of the light by the deflection part of the head-up display apparatus of FIG. It is explanatory drawing which shows the conventional head-up display apparatus.

A mode for carrying out the present invention will be described with reference to the drawings.

As shown in FIG. 1, a head-up display device (HUD) 11 according to the present embodiment is provided inside a HUD housing 14 in which a cover glass 13 located below a front windshield 12 of a vehicle is formed. The display light L is projected onto a part of the front windshield 12. The display light L is reflected by the front windshield 12 to generate a virtual image V, and causes the viewer D to visually recognize the virtual image V by superimposing it on the real scene passing through the front windshield 12.

In detail, the HUD 11 includes a display unit 15 described later and a folding mirror as a reflection mirror that simply reflects light by vapor-depositing a metal such as aluminum on a resin such as polycarbonate molded so as to have a flat portion. 16, a concave mirror 17 that is formed by vapor-depositing a metal such as aluminum on a resin such as polycarbonate that is molded to have a concave surface portion, and that expands and reflects light, a microprocessor, and various electronic components for operating the same. The control unit 18 includes a board and a case, and appropriately displays an image of the HUD 11 based on vehicle information and an input from the viewer D.

As shown in FIG. 2, the display means 15 is controlled by the control unit 18 to project and display light, and a collimating optical system 20 that converts the projection light (emitted light) from the display 19 into parallel light. Then, the light emitted from the collimating optical system 20 is incident, and the light is emitted by a first and second deflecting means described later over a certain range (a forming range of the deflecting portion 22 or a forming range of the diffusion plate 23). The light guide 21, the light emitted from the light guide 21, and the deflecting unit 22 that restricts the direction of the light so that the light is emitted from one virtual point, the light emitted from the deflecting unit 22 are incident. , And a diffusion plate 23 which diffuses the display light L and emits the display light L toward the folding mirror 16.

The display 19 is a projector or a micro LED display that uses a reflective display device such as DMD or LCoS, and the collimating optical system 20 is a collimating lens that is a glass convex lens (biconvex lens).

Further, the light guide 21 guides the incident light to the inside of the light guide 21 by the first deflecting means (first light reflecting film) 21a and writes it by the second deflecting means (second light reflecting film) 21b. The light is emitted to the outside of the guide 21 in a wide range. The first deflecting means 21a and the second deflecting means 21b are arranged inside the light guide 21. The first deflecting means 21a reflects the light incident on the light guide 21, and the second deflecting means 21b transmits the light propagating in the light guide 21 by total reflection a plurality of times. , And is emitted from the light guide 21. That is, the first deflecting means 21a functions as a reflecting mirror, and the second deflecting means 21b functions as a semi-transmissive mirror. Incidentally, the light guide 21 in which the first deflecting means 21a and the second deflecting means 21b are thus arranged is disclosed in JP-A-2014-78022.

As shown in FIG. 3, the deflecting unit 22 is composed of two (a pair of) masks 24 and 25 facing each other, and the light guide 21 is disposed at a position corresponding to the light emission range of the light guide 21. It is arranged at a position closer to the viewer D side. The mask 24 is a flat plate made of polycarbonate and has a pitch p ₁ at equal intervals in the horizontal direction (left-right direction in FIG. 2) and the vertical direction (vertical direction in the plane of FIG. 2A, vertical direction in FIG. 2B). In the same manner, the mask 25 is also formed by printing a pattern in which circular holes 26 are punched, and circular holes 27 are also punched in a flat plate made of polycarbonate in the horizontal and vertical directions at equal pitches p _2. Printed pattern. The pitch p ₁ and the pitch p ₂ are W, the distance between the holes 26 at both ends of the mask 24, M the number of pixels (the number of holes 26 in the horizontal and vertical directions: the number of dots forming an image), and the optical system of the HUD 11. The position of a virtual one point (viewpoint E) determined by the optical characteristics of (the distance from the deflecting unit 22 to the viewpoint E) is d, the separation distance between the mask 24 and the mask 25 is g, and the optical system of the HUD 11 is optical. When the angle of view determined by the dynamic characteristics is θ, the following equations (Equation 1, Equation 2, Equation 3) are satisfied.

The diffusion plate 23 is made of a polycarbonate flat plate, and the display light L emitted from the diffusion plate 23 has the same light distribution as the display light emitted from the screen of the conventional HUD. Further, in this case, the diffusion plate 23 is arranged at a position closer to the viewer D side than the arrangement position of the deflection unit 22 in correspondence with the emission range of the light from the deflection unit 22.

The display light L from the display means 15 is reflected by the folding mirror 16, then enlarged and reflected by the concave mirror 17, transmitted through the cover glass 13, and projected on the front windshield 12. The display light L projected on the front windshield 12 is magnified and reflected toward the viewer D, and a virtual image V is generated to be displayed on the viewer D while being superimposed on the real scene that passes through the front windshield 12.

In the HUD 11 according to the present embodiment, the display unit 15 that emits the display light L is controlled by the control unit 18 to emit the light, and the collimating optical system 20 through which the light emitted from the display 19 passes. The light guide 21, the deflecting unit 22, and the diffusing plate 23 are provided, and the collimating optical system 20, the light guide 21, the deflecting unit 22, and the diffusing plate 23 can be arranged in the vicinity of the display unit 19, so a screen is used. Unlike the conventional configuration, it is not necessary to secure a certain distance in the optical system, the volume of the display unit 15 is suppressed, and the HUD 11 can be easily downsized. In particular, by using a small projector or a micro LED display for the display device 19, the HUD 11 can be further downsized.

Although the embodiments for carrying out the present invention have been illustrated above, the embodiments of the present invention are not limited to the above-described ones, and may be appropriately modified without departing from the spirit of the invention.

For example, in the above-described embodiment, the display light is projected by using the front windshield of the vehicle as the reflective translucent member, but a combiner may be used instead of the front windshield.

Further, the mask of the deflecting section is not composed of two resin plates on which patterns are printed, but a mask corresponding to the mask 24 is pattern-printed on one of the front and back of one transparent resin plate, and the mask 25 is formed on the other. A corresponding mask may be printed by patterning.

11 Head-up display device 12 Front windshield (reflection/transmissive member)
15 display means 18 control section 19 display 20 collimating optical system 21 light guide (light guide)
22 Deflection part 23 Diffusion plate (diffusion member)
24 mask 25 mask 26 hole 27 hole L display light V virtual image

Claims (4)

A head-up display that projects display light onto a reflective translucent member provided in a vehicle, and superimposes the display light on the real light transmitted through the reflective translucent member to generate and display a virtual image by the display light reflected by the reflective translucent member. A device,
The display unit that emits the display light includes a display unit that emits the light under the control of the control unit, and a collimating optical system through which the output light of the display unit passes, a light guide, a deflection unit, and a diffusing member. Head-up display device characterized by. The head-up according to claim 1, wherein the collimating optical system, the light guide, the deflecting unit, and the diffusing member are arranged in this order so that the light emitted from the display unit passes through. Display device. The head-up display device according to claim 1, wherein the display is a projector or a micro LED display. 4. The deflection unit is formed by combining a plurality of masks having holes at predetermined intervals so that the light emitted from the deflection unit is emitted from one virtual point. The head-up display device according to item 1.

Images