JP2020086253A - Head-up display device - Google Patents

Abstract

To provide a head-up display device that makes virtual images readily recognized so as to be along a road surface from when viewed from viewers.SOLUTION: Head-up display devices (1A and 1B) of the present disclosure is the head-up display devices that comprise: light sources (10A and 10B); display parts (12A and 12B) that form on a display surface, an image being irradiated with the light sources (10A and 10B) and reflecting a virtual image V; and a control unit 14 that controls the light sources (10A and 10B) and display parts (12A and 12B). The control unit 14 is configured to cause the display parts (12A and 12B) to form the image on the display surface in a perspective diagram method with an advancement direction of a vehicle as a depth direction, and a trapezoid frame-like shield part 11 is provided on a front surface side or rear surface side of the display parts (12A and 12B).SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a head-up display device.

Conventional head-up display devices include those disclosed in Patent Document 1 and Patent Document 2. The head-up display device disclosed in Patent Document 1 is a liquid crystal type head-up display device, and since a virtual image is shown along the road surface when viewed from the viewer, a direction away from the viewer (a traveling direction when the vehicle moves forward) ), the display image is stretched to display a virtual image.

Further, the head-up display device disclosed in Patent Document 2 is a projection-type head-up display device, and since a virtual image is shown along the road surface as viewed from the viewer, if the optical path length of display light passing above and below the screen is different. The virtual image is displayed by changing the image forming distance above and below the virtual image.

JP, 2018-15882, A JP, 2018-167669, A

In the head-up display device disclosed in Patent Document 1 or Patent Document 2, the outer edge of the virtual image display region shines lightly, and the boundary between the display region and the non-display region (defined as postcard display in the present disclosure). ) Is visible.

In the head-up display device disclosed in Patent Document 1 or Patent Document 2, a line in the depth direction (the traveling direction of the vehicle) such as the one-point perspective drawing is predetermined when a virtual image is shown along the road surface as viewed from the viewer. Display a picture that converges to the vanishing point of. However, since the postcard is displayed in a rectangular shape, there is a problem that it is difficult for the viewer to recognize the virtual image as if it were along the road surface.

The present disclosure aims to provide a head-up display device in which a virtual image is easily recognized by a viewer as if it were along a road surface.

The head-up display device of the present disclosure is
A light source,
A display unit that forms an image representing a virtual image on the display surface by being illuminated by the light source,
A head-up display device mounted on a vehicle, comprising: a light source and a control unit that controls the display unit,
The control unit causes the display unit to form the image on the display surface by a perspective method in which a traveling direction of the vehicle is a depth direction,
A trapezoidal frame-shaped light-shielding portion is provided on the front surface side or the back surface side of the display portion.

According to the present disclosure, it is possible to provide a head-up display device in which a virtual image is easily recognized by a viewer as if it were along a road surface.

1 is a schematic configuration diagram of a head-up display device according to a first embodiment. FIG. The figure which shows the 1st state of a frame-shaped light-shielding part. The figure which shows the 2nd state of a frame-shaped light-shielding part. The figure which shows virtual image display when a frame-shaped light-shielding part is in a 1st state. The figure which shows virtual image display when a frame-shaped light-shielding part is in a 2nd state. FIG. 3 is a schematic configuration diagram of a head-up display device of a second embodiment.

A head-up display device of the present disclosure will be described with reference to the accompanying drawings (FIGS. 1 to 6).

(First embodiment)
Please refer to FIG. The head-up display device 1A according to the first embodiment of the present disclosure includes a projector (light source) 10A, a frame-shaped light shielding unit 11, a screen (display unit) 12, a concave mirror 13, a control circuit board (control unit) 14, and a housing 15. , Is provided.

The head-up display device 1A is housed in an instrument panel on the driver's seat side of the vehicle. The back surface of the screen 12A is irradiated with the light emitted from the projector 10A, and an image is formed on the display surface of the screen 12A. The light emitted from the image formed on the display surface of the screen 12A is reflected by the concave mirror 13 and emitted from the translucent dustproof cover (emission port) 16 of the housing 15 to the outside of the housing 15. The light emitted to the outside of the housing 15 is projected on the windshield 2 in front of the driver's seat of the vehicle. The occupant (viewer) 4 who has boarded the vehicle and is seated in the driver's seat visually recognizes the windshield 2 from within the virtual image visible region 3, and thus, from the image formed on the display surface of the screen 12A in front of the windshield 2. The virtual image V of the emitted light can be seen.

The projector 10A uses, for example, a reflective display such as a DMD (digital micromirror device).

The frame-shaped light shielding unit 11 is a frame-shaped covering member that shields a part of the light emitted by the projector 10A, and is provided between the projector 10A and the screen 12A, that is, on the incident surface side of the screen 12A. The frame-shaped light shielding unit 11 can be controlled by the control circuit board 14 to change the frame shape for shielding a part of the light emitted from the projector 10A. Details will be described later.

The screen 12A uses a holographic diffuser, a microlens array, a diffusion plate, and the like. The screen 12A is controlled by the control circuit board 14 and can be inclined at an angle of 0 to θ12 with reference to the vertical direction. When the screen 12A is inclined by the angle θ12, the virtual image V displayed in front of the windshield 2 is also visually recognized by being inclined by the angle θv.

The concave mirror 13 is a magnifying glass for magnifying a virtual image. The curved surface of the concave mirror 13 includes a shape that corrects the distortion of the virtual image V due to the curved shape of the windshield 2.

The control circuit board 14 is a circuit board on which a micro controller that controls the projector 10A, the frame-shaped light shielding unit 11, and the screen 12A is mounted. The control circuit board 14 is connected to an in-vehicle network such as a CAN (Controller Area Network), and transmits various vehicle information such as the traveling speed of the vehicle, the engine speed, warning information of the vehicle, and route guidance information via the CAN. get.

The housing 15 is a case that houses the projector 10A, the frame-shaped light-shielding portion 11, the screen 12A, the concave mirror 13, and the control circuit board 14. The case 15 is provided with an opening (emission port) for emitting light representing a virtual image to the outside of the case 15. This opening is covered with a translucent dustproof cover 16 made of acrylic resin.

Please refer to FIG. 2 and FIG. The frame-shaped light-shielding portion 11 is mainly composed of a light-shielding base portion 111 in which a rectangular opening 110 is formed, and a light-shielding shape changing portion 112 that rotates around a rotation shaft 1120 and covers a part of the opening 110. The frame-shaped light-shielding portion 11 is controlled by the control circuit board 14 so that the rectangular opening 110 as shown in FIG. 2 is not covered by the light-shielding shape changing portion 112 and the rectangular state as shown in FIG. A part of the opening 110 is covered with the light shielding shape changing portion 112, and the opening 110 is changed to the second state S2 in which the opening 110 has a trapezoidal shape.

Please refer to FIG. When the control circuit board 14 moves the screen 12A parallel to the vertical direction, the virtual image V displayed in front of the windshield 2 is also displayed parallel to the vertical direction. At this time, the control circuit board 14 displays the vehicle information info on the screen 12A as a normal image that is not a perspective projection method. Further, the control circuit board 14 changes the frame-shaped light shielding unit 11 to the first state S1. By doing so, the virtual image V is displayed while standing in the vertical direction, and the postcard Vf of the virtual image V at that time is displayed in a rectangular shape.

Please refer to FIG. When the control circuit board 15 moves the screen 12A so as to incline at an angle θ12 with respect to the vertical direction, the virtual image V displayed in front of the windshield 2 is also displayed at an angle θv with respect to the vertical direction. At this time, the control circuit board 14 causes the screen 12A to display a perspective image in which the vehicle information info is represented by a perspective method in which the traveling direction of the vehicle is the depth direction. The perspective image is, for example, an image showing route guidance information represented by an arrow narrowing in the depth direction as shown in FIG. Further, the control circuit board 14 changes the frame-shaped light shielding unit 11 to the second state S2. By doing so, the virtual image V is displayed tilted by the angle θv in the vertical direction, and the postcard Vf of the virtual image V at that time is displayed as a trapezoid with its upper part narrowed, and the postal vehicle information info represented by the perspective view is displayed. Combined with the perspective, the virtual image V is easily recognized by the viewer 4 as if it were along the road surface.

(Second embodiment)
The frame-shaped light shielding unit 11 of the present disclosure can be applied to the liquid crystal type head-up display device 1B shown in FIG. 6 in addition to the projection type head-up display device 1A shown in the first embodiment.
The head-up display device 1B according to the second embodiment of the present disclosure will be described based on the difference from the head-up display device 1A according to the first embodiment. The head-up display device 1B is different from the head-up display device 1A in that the projector 10A is replaced with an LED circuit board 10B and the screen 12A is replaced with a liquid crystal display element 12B. Further, the frame-shaped light shielding portion 11 is provided on the emission side of the liquid crystal display element (display portion) 12b.

Further, the head-up display device 1B is one in which the inclination of the virtual image V is fixed. The control circuit board 14 changes the frame-shaped light shielding unit 11 to the second state S2 when displaying the vehicle information info represented by the perspective drawing on the liquid crystal display element 12b. By doing so, the postcard Vf of the virtual image V displayed as a trapezoid whose upper part is narrowed and the perspective of the vehicle information info represented by the perspective method are combined, and the virtual image V is seen along the road surface from the viewpoint of the viewer 4. Is easy to recognize.

1A Projection type head-up display device 1B Liquid crystal type head-up display device 10A Projector (light source)
10B LED board (light source)
11 Frame Light-Shielding Part 12A Screen 12B Liquid Crystal Display Element 14 Control Circuit Board (Control Part)

Claims (4)

A light source,
A display unit that forms an image representing a virtual image on the display surface by being illuminated by the light source,
A head-up display device mounted on a vehicle, comprising: a light source and a control unit that controls the display unit,
The control unit causes the display unit to form the image on the display surface by a perspective method in which a traveling direction of the vehicle is a depth direction,
A trapezoidal frame-shaped light-shielding portion is provided on the front surface side or the back surface side of the display portion,
A head-up display device characterized by the above. The frame-shaped light-shielding portion is configured so that the trapezoidal shape can be changed.
The head-up display device according to claim 1, wherein: The light source is a projector,
The display unit is a screen illuminated by the projector,
The head-up display device according to claim 1 or 2, characterized in that. The light source is an LED,
The display unit is a liquid crystal display device,
The head-up display device according to claim 1 or 2, characterized in that.

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