Relay systems may be incorporated into optical systems to direct light from at least one image source to a viewing volume. Light from a plurality of image sources may be directed by relay systems to a viewing volume. Some light from the plurality of image sources may be occluded by an occlusion system to reduce undesirable artifacts in when the relayed light from the plurality of image sources are observed in the viewing volume.

Disclosed is an image stitching-based aerial image formation apparatus, including sequentially along an optical path direction: an image source comprising a plurality of display units arranged in an array; a rear lens group comprising a plurality of optical lens units arranged in an array; and a front lens group, wherein light rays passing through the rear lens group are converged via the front lens group to render a real image in midair. The disclosure offers the following benefits: by splitting the image source into a plurality of display units arranged in an array and constituting the rear lens group by a plurality of optical lens units arranged in an array, the image is split into smaller patches, such that the longitudinal distance needed for chromatic aberration adjustment also decreases, which shrinks the longitudinal dimension of the whole apparatus so as to be better adapted for installation in a narrow space.

Disclosed is an image stitching-based aerial image formation apparatus, including sequentially along an optical path direction: an image source comprising a plurality of display units arranged in an array; a rear lens group comprising a plurality of optical lens units arranged in an array; and a front lens group, wherein light rays passing through the rear lens group are converged via the front lens group to render a real image in midair. The disclosure offers the following benefits: by splitting the image source into a plurality of display units arranged in an array and constituting the rear lens group by a plurality of optical lens units arranged in an array, the image is split into smaller patches, such that the longitudinal distance needed for chromatic aberration adjustment also decreases, which shrinks the longitudinal dimension of the whole apparatus so as to be better adapted for installation in a narrow space.

Disclosed is an image stitching-based aerial image formation apparatus, including: two image sources, rear lenses and a front lens, wherein partial display contents of the two image sources overlap; the rear lenses are in one-to-one correspondence with the image sources and have a positive focal lens; the front lens is configured to converge the light rays, which have passed through the rear lenses, into a real image; the two image sources are respectively located at two sides of the plane passing through the main axis of the front lens; the images displayed by the two image sources, after having respectively passed the rear lenses and the front lens, are stitched into a real image which is a complete image.

Disclosed is an image stitching-based aerial image formation apparatus, including: two image sources, rear lenses and a front lens, wherein partial display contents of the two image sources overlap; the rear lenses are in one-to-one correspondence with the image sources and have a positive focal lens; the front lens is configured to converge the light rays, which have passed through the rear lenses, into a real image; the two image sources are respectively located at two sides of the plane passing through the main axis of the front lens; the images displayed by the two image sources, after having respectively passed the rear lenses and the front lens, are stitched into a real image which is a complete image.

Disclosed in the present invention is a floating hologram system. The floating hologram system includes a diffuser configured to form a projection image using light beams transmitted from an image transmitter and diffuse the formed image, and a holographic optical element on which the image diffused from the diffuser is incident and which generates a virtual image floating at a position a predetermined distance therefrom and has a convex lens characteristic. A distance between the diffuser and the holographic optical element is determined based on a focal length of the holographic optical element and a distance from the holographic optical element to the virtual image.

A floating image display device includes: an image forming device configured to form a source image; a waveguide configured to output a light of the source image to another location by guiding the light; a holographic optical device provided on a proceeding path of the light output from the waveguide, the holographic optical device including a hologram pattern that diffracts incident light of a certain incident angle region output from the waveguide by a set target diffraction angle and a floating element including a plurality of corner reflectors and forming a floating image of the source image by forming an image of the light output from the holographic optical device at a certain location in mid-air.

A novel detachable holographic apparatus incorporates a dedicated upper shelf section that orients a portable electronic device's display screen to face downward after being inserted into the dedicated upper shelf section of the apparatus. The upper shelf section is created with a smartphone holder made of a rectangular center opening surrounded by a surrounding frame. The rectangular center opening allows the portable electronic device's display screen to project an image downward from the dedicated upper shelf section. The novel detachable holographic apparatus also incorporates a transparent display sheet or a one-way mirror sheet underneath the dedicated upper shelf section at a 45-degree angle relative to the surface of the portable electronic device's display screen, which in turn engender partial optical refractions and/or reflections of the image originating from the portable electronic device's display screen to form a hologram near the transparent display sheet or the one-way mirror sheet.

Provided are an optical anti-counterfeiting element and an anti-counterfeiting product, the optical anti-counterfeiting element comprises: a substrate (1); and a plurality of Fresnel structures (2) with preset lateral dimensions formed on the substrate (1), the plurality of Fresnel structures (2), when illuminated by a preset light source, being used to form preset graphic information in the transmission direction, and to present the preset graphic information with a relief effect in the reflection direction. The optical anti-counterfeiting element, when illuminated, reproduces a preset pattern from the transmission direction, and presents a relief effect from the reflection direction. The element improves anti-counterfeiting ability and recognition, and has a simple identification process.

Provided are an optical element and an image display apparatus that display an aerial image, in which the total volume of the apparatus is small, a reduction in size can realized, and a scenery can be recognized. The optical element includes: a light guide element including a light guide plate, an incidence diffraction element, and an emission diffraction element, the incidence diffraction element being disposed on a main surface of the light guide plate and the emission diffraction element being disposed on the main surface of the light guide plate; and a positive lens that is disposed at a position overlapping the emission diffraction element in a view from a direction perpendicular to the main surface of the light guide plate, in which the incidence diffraction element diffracts incident light such that the diffracted light is incident into the light guide plate, the emission diffraction element emits light propagating in the light guide plate from the light guide plate, and the positive lens collects the light that is emitted from the light guide plate by the emission diffraction element.