An image display device has a first image projection unit configured to emit light for forming a first image [RAU], an image forming optical unit configured to form the first image at a first distance and cause the first image to be incident on a viewpoint of a user, and a rotation support unit configured to rotatably hold the image forming optical unit with a fulcrum point as a rotation center.

A head-up display device is provided which can suppress error in the attachment position of a fixed mirror. This head-up display device is provided with a display which emits display light, a first mirror which reflects display light from the display, a second mirror which is provided rotatably about a rotation axis and which reflects towards a window shield the display light reflected by the first mirror, a mirror support unit which supports the first mirror, a holding case unit which holds the second mirror and which is formed integrally with the mirror support unit, and plate springs which fix the first mirror to the mirror support unit by pressing the first mirror towards the mirror support unit.

An optical film and an optical imaging system are provided. The optical film includes a first lens layer, a first deflection layer, a reflection layer, a second deflection layer, and a second lens layer. The second lens layer is attached to a windshield. The reflection layer is configured to reflect an image light beam to form a first reflected light beam and the first lens layer and the first deflection layer are configured to amplify and/or deflect the first reflected light beam, to guide the first reflected light beam to a field-of-view direction. The second lens layer and the second deflection layer are configured to amplify and/or deflect a second reflected light beam, to guide the second reflected light beam to a first direction. The second reflected light beam is formed by that the windshield reflects the image light beam. The field-of-view direction is different from the first direction.

A head-up display screen, a head-up display assembly, and a vehicle are provided. The head-up display screen is attached to an inner side of an attachment surface of a windshield and configured to reflect image light emitted towards the windshield. The head-up display screen includes a functional layer, a reflective layer, and a protective layer that are sequentially arranged in a direction from the windshield to a driving position. The functional layer includes prism microstructures protruding from the inner side of the attachment surface of the windshield. The reflective layer is at least attached to lower inclined surfaces of the prism microstructures and is configured to reflect the image light towards the driving position. The protective layer covers the reflective layer and the functional layer.

Provided is a low-cost image display apparatus that has asymmetry in the display characteristics in the right-to-left direction, displays a clear image to the driver, exhibits an appropriate viewing angle control function that reduces reflected glare on the window glass, and is thinly made While causing no moire, and there are also provided an information display system for a vehicle, and an optical film. The image display apparatus includes a viewing-side polarizing plate, a liquid crystal cell, a backlight-side polarizing plate, an optical film, and a backlight in this order, in which the optical film includes an optically anisotropic layer and a polarizer in this order from the liquid crystal cell side, the absorption axis of the backlight-side polarizing plate and the absorption axis of the polarizer are parallel or orthogonal to each other, the optically anisotropic layer is optically uniaxially anisotropic, while in a case where the optic axis of the optically anisotropic layer is projected onto the polarizer as viewed from the viewing-side of the image display apparatus, the azimuthal angle of the optic axis is +50° to +70° or −50° to −70° with respect to the horizontal direction, the average tilt angle of the optic axis with respect to the main surface of the optically anisotropic layer is 20° to 45°, and the in-plane phase difference Re (550) of the optically anisotropic layer is 70 nm to 240 nm.

A display system includes a display and a shielding member. The display has a display screen to display an image thereon. The shielding member has an opening, through which light emerging from the display screen passes. The shielding member defines a shape of the light emerging from the display screen. The display screen has a non-rectangular display area to display the image thereon. At least one peripheral edge of the opening defines a shape that conforms to an outer peripheral shape of the display area.

A head-up display is configured to project an image on a transparent reflection member to cause an observer to visually recognize a virtual image, and includes a display device configured to display the image, and a projection optical system configured to project the image displayed by the display device as the virtual image for the observer. The projection optical system is configured to form an image as an intermediate image, and includes a first lens configured to condense light, and a first optical element configured to diffuse light. The first lens and the first optical element are disposed in this order along an optical path from the display device. The first lens is inclined with respect to a reference beam which is defined as a beam reaching a center of a viewpoint region of the observer and corresponding to a center of the virtual image.

A head-up display comprising an image generator with a light source, a tilted display, a display glass wherein the display glass has a wedged shape, a light trap, an optical system, and a transmissive screen is disclosed.

A vehicular display device includes a reflection-type hologram disposed inside a windshield of a vehicle and a projection device that projects display light toward the hologram. The hologram outputs the display light from the projection device as diffracted light that travels toward the eye range of the vehicle. The projection device is arranged such that display light reflected off the windshield travels in a direction different, from the direction toward the eye range in a vehicle width direction.

Provided is a head up display (HUD) device in which occurrence of postcard can be reduced. The HUD device causes an image to be visually recognized as a virtual image. The HUD device is provided with: a projector 100 that emits projection light including light indicating an image; a screen 60 which the projection light reaches; and a light shielding part S that shields at least a part of the projection light excluding the light indicating the image. The screen 60 has a display possible region Rc that is a range which the projection light can reach, and a display region Ra to which the image is projected.