JP6926832B2 - Head-up display device - Google Patents

Description

The present invention relates to a head-up display device including a screen on which light is obliquely incident.

There is a so-called head-up display device that displays various information on the windshield of a vehicle or the like and makes the displayed information visible together with the surrounding background. For example, as a conventional technique relating to a head-up display device, there is a technique disclosed in Patent Document 1.

The head-up display device disclosed in Patent Document 1 includes a first projector that projects a first projected light on a housing, a first screen on which the first projected light is imaged, and a first. A plane mirror that reflects the first diffused light emitted from the screen, a second projector that projects the second projected light, a second screen on which the second projected light is imaged, and a second that is reflected by the plane mirror. A half mirror that transmits the diffused light of 1 and a second diffused light emitted from the second screen, and a concave mirror that reflects the display light emitted from the half mirror are housed and configured.

When the first diffused light and the second diffused light emitted from the head-up display device are incident on the windshield, the occupant can visually recognize the first virtual image and the second virtual image. In particular, the first screen is tilted with respect to an orthogonal plane orthogonal to the optical axis of the projected light. As a result, the first virtual image is visually recognized in a state of being tilted away from the occupant.

Japanese Unexamined Patent Publication No. 2016-21238

Since the first screen is tilted, the brightness of the first diffused light emitted from the first screen also decreases as the imaging distance from the first projector to the first screen increases. As a result, the brightness of the first virtual image visually recognized by the occupant is also non-uniform.

In order to make the brightness uniform, it is conceivable that the brightness of the projected light incident on the first screen is adjusted in advance on the projector side, but the control of the projected light becomes complicated. Even if the screen is arranged at an angle, it is desirable that the brightness of the virtual image visually recognized by the occupant is uniform.

An object of the present invention is to provide a technique for suppressing a difference in the brightness of diffused light for a screen arranged diagonally.

According to the invention of claim 1, the present invention includes a projector that projects light and a screen through which the light is formed and transmitted, and the screen is provided with respect to an orthogonal plane orthogonal to the optical axis of the light. In a tilted head-up display device
A head-up display device characterized in that a brightness adjusting filter is interposed in the optical path of the light so that the brightness of the light transmitted through the brightness adjusting filter and the screen is made uniform. Is provided.

As described in claim 2, preferably, the screen is inclined with one end as a base point and the other end away from the projector.
The shading rate of the luminance adjusting filter increases from the other end side toward the one end side.

In the invention of claim 1, the screen is tilted with respect to an orthogonal plane orthogonal to the optical axis of light. Further, by interposing a brightness adjusting filter in the optical path of the light, the brightness of the light transmitted through the brightness adjusting filter and the screen is made uniform.

That is, the brightness adjustment filter is arranged on the incident side or the outgoing side of the screen. The brightness of the light incident on the screen is lowered in advance, or the brightness of the emitted light is lowered after the fact. Therefore, when the light passes through both the brightness adjusting filter and the screen, the brightness of the light becomes uniform, and the brightness of the virtual image visually recognized by the occupant also becomes uniform.

In the invention according to claim 2, the screen is tilted in a direction away from the projector at the other end with one end as a base point, and the light shielding rate of the brightness adjusting filter is directed from the other end side away from the projector toward one end side. It gets higher as you go. That is, the shading rate of the luminance adjusting filter is adjusted according to the distance from the projector to the screen. As a result, when the light passes through both the brightness adjusting filter and the screen, the brightness of the light becomes uniform, and the brightness of the virtual image visually recognized by the occupant also becomes uniform.

It is a schematic diagram of the head-up display device according to the Example of this invention. It is a figure explaining the operation of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<Example>

FIG. 1 shows a head-up display device 10 according to an embodiment of the present invention. The head-up display device 10 is mounted on a vehicle, for example.

The head-up display device 10 is provided with a housing 11, a partition plate 12 for vertically partitioning the inside of the housing 11, and a first projection light 21 (light 21) provided on the upper surface of the partition plate 12. A projector 22 (projector 22), a light-shielding filter 30 (brightness adjustment filter 30) provided on the upper surface of the partition plate 12 and incident with the first projected light 21, and a first projection transmitted through the light-shielding filter 30. A first screen 23 (screen 23) through which the light 21 is imaged and transmitted, and a first mirror 25 that downwardly reflects the first diffused light 24 (light 24) transmitted through the first screen 23. A second projector 42 that is attached to the lower surface of the partition plate 12 and emits a second projected light 41, a second screen 43 through which the second projected light 41 is imaged and transmitted, and the second screen 43. A half mirror 45 that transmits the second diffused light 44 that has passed through the screen 43 and reflects the first diffused light 24 that has passed through the first screen 23, and a half mirror 45 that reflects the light from the half mirror 45 upward. It is composed of a second mirror 46 to be made to move.

The housing 11 includes a lower housing 13 and an upper housing 14 that covers the upper opening of the lower housing 13. A partition plate 12 is attached to the lower housing 13 via a stay 51. An opening 15 is formed in the upper housing 14.

The first projector 22, the second projector 42, the first screen 23 and the second screen 43, the light blocking filter 30, the first mirror 25, and the half mirror 45 are respectively via stays 52 to 58. It is attached to the partition plate 12.

The light-shielding filter 30 is interposed between the first projector 22 and the first screen 23 on the optical path of the first projected light 21. As a result, the brightness of the first diffused light 24 that has passed through the light blocking filter 30 and the first screen 23 is made uniform. Details of the light-shielding filter 30 will be described later.

The first screen 23 is tilted with respect to an orthogonal plane 28 orthogonal to the optical axis of the first projected light 21, and for example, a transparent resin is adopted. Navigation information is displayed on the first screen 23.

Similarly, the second screen 43 is also tilted, for example, a transparent resin is adopted. The traveling speed of the vehicle is displayed on the second screen 43.

The first mirror 25 is a flat mirror having a metal reflective film or a dielectric multilayer film on the surface. The second mirror 46 is a concave mirror attached to the front end of the lower housing 13.

As indicated by the alternate long and short dash line, the first projected light 21 emitted from the first projector 22 is imaged on the first screen 23, and navigation information is displayed. The first diffused light 24 transmitted through the first screen 23 is reflected by the first mirror 25, the half mirror 45, and the second mirror 46 and projected onto the windshield 16, and the occupant receives the virtual image V1. Can be visually recognized.

Similarly, as indicated by the alternate long and short dash line, the second projected light 41 emitted from the second projector 42 is imaged on the second screen 43, and the vehicle speed is displayed. The second diffused light 44 transmitted through the second screen 43 is transmitted through the half mirror 45, reflected by the second mirror 46, and projected onto the windshield 16, so that the occupant can visually recognize the virtual image V2.

Next, the light-shielding filter 30 and the first screen 23 will be described.

See FIG. 2 (a). The diffused light 100 emitted from the first screen 23 when the light blocking filter 30 is not interposed on the optical path of the first projected light 21 will be described. The diffused light 100 is the diffused light 100a to 100f in order from the upper end portion 27 side of the first screen 23.

The upper end 27 of the first screen 23 is tilted in a direction away from the first projector 22 with the lower end 26 as a base point (tilt angle θ). Since the distance from the first projector 22 increases toward the upper end 27 side of the first screen 23, the position where the first projected light 21 forms an image becomes farther. The brightness of the diffused light 100a is the lowest, and the brightness of the diffused light 100f is the highest.

See FIG. 2 (b). The light-shielding filter 30 includes a base 31 made of transparent polycarbonate and a plurality of, for example, six first light-shielding parts 32 to sixth light-shielding parts 37 printed on the base portion 31. The first light-shielding portion 32 to the sixth light-shielding portion 37 has a band shape and extends along the inclination center line CL of the first screen 23.

The colors of the light-shielding portions 32 to 37 become darker toward the lower end portion 26 side from the upper end portion 27 side of the first screen 23. That is, the shading rate increases from the first shading portion 32 toward the sixth shading portion 37.

The first projected light 21 whose brightness is adjusted by passing through the first light-shielding portion 32 is referred to as the adjusting light 21a. Similarly, the first projected light whose brightness is adjusted by passing through the second light-shielding portion 33 to the sixth light-shielding portion 37 is referred to as adjustment light 21b to adjustment light 21f, respectively.

Since the light-shielding rate increases from the first light-shielding portion 32 to the sixth light-shielding portion 37, the brightness of the adjustment light 21a is the highest and the brightness of the adjustment light 21f is the lowest.

The shading rate of the first shading portions 32 to the sixth shading portions 37 is determined according to the brightness of the diffused light 100a to 100f. That is, the configuration is such that the adjustment light having high brightness is incident on the portion that emits the diffused light having low brightness, and the adjustment light having low brightness is incident on the portion that emits the diffused light having high brightness.

See also FIG. 2 (c). The light transmitted by the adjusting light 21a through the first screen 23 is referred to as the first diffused light 24a. Similarly, the light transmitted by the adjusting light 21b to the adjusting light 21f through the first screen 23 is referred to as the first diffused light 24b to the first diffused light 24f.

Since the brightness of the first projected light 21 incident on the first screen 23 is adjusted in advance by the light blocking filter 30, when the first projected light 21 passes through both the light blocking filter 30 and the first screen 23. , The brightness of the first diffused light 24a to the first diffused light 24f becomes uniform. As a result, the brightness of the virtual image V1 visually recognized by the occupant is also uniform.

The light-shielding filter 30 may be arranged on the exit side of the first screen 23, or may be arranged between the first screen 23 and the first mirror 25, for example. In this embodiment, the first projector 22 is arranged at the position farthest from the opening 15, and the light blocking filter 30 is adjacent to the first projector 22. Therefore, as compared with the case where the light-shielding filter 30 is arranged on the exit side of the first screen 23, it is less susceptible to the influence of external light incident from the opening 15.

Further, the light-shielding filter 30 may be attached to, for example, the first mirror 25.

Although the head-up display device 10 according to the present invention has been described by taking a vehicle as an example, it can be applied to other vehicles and is not limited to those of these types. Further, the screen is not limited to the windshield, and may be a combiner supported by the case. That is, the present invention is not limited to the examples as long as the actions and effects of the present invention are exhibited.

The head-up display device of the present invention is suitable for mounting on a vehicle.

10 Head-up display device 21 First projected light (adjustment light 21a to adjustment light 21f)
22 First projector 23 First screen 24 First diffused light 25 First mirror 30 Light-shielding filter (luminance adjustment filter)
31 Bases 32 to 37 First light-shielding part to sixth light-shielding part

Claims (1)

In a head-up display device having a projector for projecting light and a screen through which the light is formed and transmitted, the screen is tilted with respect to an orthogonal plane orthogonal to the optical axis of the light.
By interposing a brightness adjusting filter in the optical path of the light, the brightness of the light transmitted through the brightness adjusting filter and the screen is made uniform .
The screen is inclined with one end as a base point and the other end away from the projector.
A head-up display device characterized in that the shading rate of the luminance adjusting filter increases from the other end side toward the one end side.

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