The present invention displays multiple images at different locations in the depth direction, while suppressing a decline in display quality, using projected light emitted from a single projector. A projector 20 emits first projection light L1 and second projection light L2 that have a first projection distance P1. A projection distance lengthening unit 251 having a negative refractive power is positioned along the path of the first projection light L1 between the projector 20 and a first screen 23, and causes an image to be formed on the first screen 23 by lengthening the projection distance P of the first projection light L1. A projection distance shortening unit 252 having a positive refractive power is positioned along the path of the second projection light L2 between the projector 20 and a second screen 24, and causes an image to be formed on the second screen 24 by lengthening the projection distance P of the second projection light L2.

An HUD system, includes at least one first HUD device, namely an AR-HUD device, with at least one first image source for displaying a first image produced by at least one hologram in a first display section of a display region and at least one second HUD device with at least one second image source for displaying a second image produced using geometric projection optics in a second display section of the display region.

Provided is a projection type display device capable of performing display of information according to a driver's desire. An HUD includes light sources; a light modulation element that spatially modulates light emitted from the light sources on the basis of projection image data; a projection unit that projects image light that is spatially modulated by the light modulation element onto a projection surface that is a part of a windshield 1 mounted in an automobile; a designation information acquisition unit that acquires designation information for designating at least one of a maximum number of pieces of content included in the projection image data, display sizes of the pieces of content, or arrangement layouts of the pieces of content on the basis of information input through an operation unit; and an image information generation unit that generates the projection image data on the basis of the designation information acquired.

Provided are a projection type display device, a projection control method, and a non-transitory recording medium readable by a computer for recording a projection control program capable of smoothly changing shapes of projection ranges of image light. A projection type display device 1 includes: projection units 11 and 12 that project image light to a projection surface 4; a drive mechanism 13 for controlling a position, on the projection surface, of a projection range of the image light projected by the projection unit 12; and a controller 60 that controls the drive mechanism 13 and changes a length, in one direction, of a range obtained by combining projection ranges of the image light projected by the respective projection units 11 and 12 and a length, in a direction orthogonal to the one direction, of the range, respectively.

A projection display device mounted in a vehicle includes a light modulation unit that spatially modulates, in accordance with image data that has been input, light emitted by a light source; a projection optical system that projects the light that has been spatially modulated onto a projection surface of the vehicle; and an image data control unit 63 that controls image data to be input to the light modulation unit. The image data control unit 63 performs, in a first mode in which driving is performed in accordance with an internally generated instruction or an externally and wirelessly received instruction, control to switch between projection of image light for normal display onto the projection surface 2 and projection of image light for warning display onto the projection surface 2.

A display device applied to an instrument panel unit includes: a projection surface provided on a surface on a vehicle interior side of an interior member provided on the vehicle interior side of a vehicle and on a front side in a vehicle front-back direction, the interior member extending along a vehicle width direction; a projector including a projection unit configured to project an image; and a holding unit configured to hold the projector by the interior member in a positional relationship where at least a part of the projection unit is located on the projection surface side of the interior member, and the image from the projection unit is projected onto the projection surface.

An external vehicle notification information system may include a projector illuminating generated information using a light source, a lens transmitting the information, a reflector reflecting partial information of the information toward the lens, and a screen displaying the partial information transmitted from the lens.

A heads-up display system includes a re-positionable projector that projects an image of data to any one of a plurality of image positions on a windshield. With the image being centered in front of a vehicle operator, the image defines a predetermined aspect ratio. An electronic controller is configured to compensate for distortion of the image and maintain the predetermined aspect ratio in response to the image being moved away from the centered position.

Embodiments concern a method for providing information to a user of a vehicle via a display device that is worn by the user. The method comprises providing a principle axes rotation coordinate system (V.sub.xyz) that defines a vehicle orientation relative to a world coordinate system (W.sub.xyz) of a reference world space; providing at least one display device coordinate system (D.sub.xyz) that defines a display device orientation relative to the vehicle coordinate system; and providing a symbol coordinate system (S.sub.xyz) that is spatially fixed with at least one first symbol to be displayed on the display device and that defines three symbol rotation axes that are orthogonal to each other; and spatially fixing at least one of the symbol rotation axes (S.sub.) to a vehicle principal axis of rotation descriptive of an orientation of the vehicle.

An information display apparatus irradiates a transmissive reflection member with light for forming an image so as to make a virtual image of the image visible on the transmissive reflection member. The information display apparatus includes a memory, and a processor coupled to the memory and configured to control, upon a change in depth of a scene position at which to superimpose the virtual image, a degree of change in a part or an entirety of the virtual image to be displayed, differently from a degree of the change in depth.