A head-up display for a vehicle may include a mirror system. The mirror system may include a mirror. The mirror may be rotatable about a first axis. For rotation about the first axis, the mirror system may include a first joint assembly spaced from a second joint assembly. The first joint assembly may include a bearing-ball joint aligned along a second axis. Additionally, the first joint assembly may include a mirror-ball joint aligned along the first axis. The mirror-ball joint may restrict movement of the bearing-ball joint to ensure that the first axis remains coaxial with the second axis.

A projection display device includes a display device, an optical system, and a shielding plate. The optical system includes a first mirror and a second mirror provided on the regular optical path, the second mirrors being to provide an optical path convergence point on the regular optical path, and the first mirrors being provided at a position corresponding to the optical path convergence point. The projection display device is configured such that a position of a mirror surface of the first mirror and the second mirror is adjustable in accordance with a position of an eye point of a user so as to project the light toward the projection position that corresponds to the position of the eye point. The shielding plate is provided such that the shieling plate does not interfere with the regular optical path and such that the shielding plate interferes with the different optical path.

Provided is a head-up display apparatus that is excellent in viewability when a display screen is viewed through a pair of polarized sunglasses, and is excellent in heat resistance. The head-up display apparatus includes: a display unit configured to output projection light; at least one reflector configured to reflect the projection light; a housing, which has an opening portion, and is configured to store the display unit and the reflector therein; a cover member configured to cover the opening portion; and a polarizing plate arranged on a housing inner side of the cover member. The cover member has an in-plane retardation Re(550) of 3,000 nm or more. The head-up display apparatus is configured so that an angle of reflection of the projection light output from the housing through the opening portion with respect to a windshield is 30 or less, or is 40 or more.

A display device has a movable screen that is movable in a movement direction, a drive controller, a projector, and a position detector. The drive controller moves the movable screen relative to a reference position set at a prescribed position in a movement range of the movable screen. The projector performs drawing on the movable screen by irradiating the movable screen with light used for scanning the movable screen and projects a virtual image onto a target space based on light that passes through the movable screen. The position detector executes position detection processing for detecting that the movable screen is located at a detection position set in relation to the prescribed position. The position detector moves the movable screen and executes the position detection processing in a non-display period in which the movable screen is not irradiated with light from the projector.

It is an object of the present invention to provide a projection optical system having a minimal optical configuration while ensuring necessary capabilities and a head-up display device having a tilted virtual image plane. The head-up display device according to the present invention includes an image forming unit to emit image light containing image information and an eyepiece optical system to display a virtual image by reflecting the image light. While a virtual image plane is tilted to display a virtual image in a range from a far distance to a near distance, a point on the image forming unit conjugating to a far point on the virtual image plane is optically farther from a light flux entering the image forming unit than a point on the image forming unit conjugating to a near point on the virtual image plane.

A display device includes a display configured to display a video, a concave mirror configured to reflect a video display light of the video displayed on the display toward a reflection part that is formed in a curved shape and that faces a viewer, and a housing in which the display and the concave mirror are assembled, wherein an angle of the concave mirror with respect to the housing is adjustable by rotating the concave mirror on a reference plane of the housing in accordance with a relative positional relationship among the housing, the reflection part, and the viewer.

A headup display device may include: a mirror part rotatably supported by a support part; a housing part installed on one side of the mirror part; a driving part installed in the housing part; a spiral gear part rotatably connected to the driving part; and a mirror rotating part connected to the mirror part, and configured to rotate the mirror part as the spiral gear part is rotated.

A display system of one aspect according to the present disclosure includes: a display unit; a first optical member; and a second optical member. The display unit includes a display surface for displaying an image. The first optical member includes a first reflective surface for reflecting rays of light constituting the image. The second optical member includes a second reflective surface for reflecting rays of light reflected from the first reflective surface to form a virtual image in a target space. An angle of view in a length direction of an available area for display of the virtual image with regard to a point of view position for the virtual image is denoted by [deg]. A length of the display surface is denoted by W [mm]. W is equal to or greater than a prescribed value given by 12.026.6. is equal to or greater than 8.0.

The invention relates to a display device (2) for a motor vehicle (1) having a housing, which comprises a projection device (3) arranged in the housing for generating a virtual image (10) on a projection surface which is located outside the housing and observable by an observer, which projection device comprises at least one mirror (6) mounted such that it is pivotable about an axis of rotation (11), which mirror is designed to deflect light (4) output by a light source of the projection device (3) in a deflection position, and having an adjustment device for adjusting the deflection position of the mirror (6) by pivoting about the axis of rotation (11), wherein the adjustment device comprises at least one first shape-memory wire (17), which is coupled to the mirror (6), and therefore the mirror (6) is pivotable about the axis of rotation (11) by a length change of the first shape-memory wire (17). Furthermore, the invention relates to a driver assistance system, a motor vehicle (1) and a method.

Light emitting devices are aligned along one alignment direction. A first diffusion plate diffuses the illumination light from each of the light emitting devices. A condensing unit exerts a condensing action on the illumination light diffused with the first diffusion plate in a vertical direction perpendicular to the alignment direction. An image forming unit has an illumination target surface illuminated with the illumination light, which is condensed with the condensing unit, and allows a part of the illumination light incident on the illumination target surface to pass therethrough to form the image and to emit display light of the image as a light flux. A second diffusion plate is located on an optical path between the condensing unit and the image forming unit to again diffuse the illumination light condensed with the condensing unit and to cause the diffused illumination light to incident on the illumination target surface.