A projecting apparatus and a projecting method, relates to the field of projecting technologies. The projecting apparatus includes: a light source (1), a projection film (2) and a lens (3), wherein the projection film (2) and the lens (3) are both located in a light path of the light source (1), a focal length of the lens (3) is greater than 0, and a positional relationship between the light source (1) and the lens (3) satisfies a formula: $0\le E\le {\left(\frac{216}{D}\right)}^{0.8},$
wherein E is a distance between the light source and the lens in centimeters; D is the focal length of the lens in centimeters, which solves the technical problem of high costs of 3D protection in the prior art, and can project a pattern on the projection film into a three-dimensional stereo image.

A projecting apparatus and a projecting method, relates to the field of projecting technologies. The projecting apparatus includes: a light source (1), a projection film (2) and a lens (3), wherein the projection film (2) and the lens (3) are both located in a light path of the light source (1), a focal length of the lens (3) is greater than 0, and a positional relationship between the light source (1) and the lens (3) satisfies a formula: $0\le E\le {\left(\frac{216}{D}\right)}^{0.8},$
wherein E is a distance between the light source and the lens in centimeters; D is the focal length of the lens in centimeters, which solves the technical problem of high costs of 3D protection in the prior art, and can project a pattern on the projection film into a three-dimensional stereo image.

An image display apparatus of the present invention includes: a beam emitting section (10) that radially emits a plurality of beams (Ls1 to Ls5) in a horizontal direction; a mirror rotary member (20) having a rotation axis (Pc) and an inner surface, the inner surface having a plurality of mirror surfaces (21) that reflects each of the plurality of beams (Ls1 to Ls5), the mirror rotary member as a whole rotating about the rotation axis (Pc) as a center to thereby perform, by the plurality of mirror surfaces (21), scanning with each of the plurality of beams (Ls1 to Ls5) emitted from the beam emitting section (10) in the horizontal direction; and a screen (2) to be irradiated with the plurality of beams (Ls1 to Ls5) with which the scanning is performed by the plurality of mirror surfaces (21).

A projection system and method therefor comprises a first light source configured to emit a first-eye light, wherein the first-eye light includes a first set of wavelengths; a second light source configured to emit a second-eye light, wherein the second-eye light includes a second set of wavelengths; a first projector including first projection optics configured to receive a first input light; and an optical switch configured to be switched between an a first mode and a second mode, wherein the optical switch is configured to, in the first mode, combine the first-eye light and the second-eye light into a combined light and direct the combined light to the first projection optics as the first input light.

A polarization conversion system (PCS) is located in the output light path of a projector. The PCS may include a polarizing beam splitter, a polarization rotating element, a reflecting element, and a polarization switch. Typically, a projector outputs randomly-polarized light. This light is input to the PCS, in which the PCS separates p-polarized light and s-polarized light at the polarizing beam splitter. P-polarized light is directed toward the polarization switch on a first path. The s-polarized light is passed on a second path through the polarization rotating element (e.g., a half-wave plate), thereby transforming it to p-polarized light. A reflecting element directs the transformed polarized light (now p-polarized) along the second path toward the polarization switch. The first and second light paths are ultimately directed toward a projection screen to collectively form a brighter screen image in cinematic applications utilizing polarized light for three-dimensional viewing.

A polarization conversion system (PCS) is located in the output light path of a projector. The PCS may include a polarizing beam splitter, a polarization rotating element, a reflecting element, and a polarization switch. Typically, a projector outputs randomly-polarized light. This light is input to the PCS, in which the PCS separates p-polarized light and s-polarized light at the polarizing beam splitter. P-polarized light is directed toward the polarization switch on a first path. The s-polarized light is passed on a second path through the polarization rotating element (e.g., a half-wave plate), thereby transforming it to p-polarized light. A reflecting element directs the transformed polarized light (now p-polarized) along the second path toward the polarization switch. The first and second light paths are ultimately directed toward a projection screen to collectively form a brighter screen image in cinematic applications utilizing polarized light for three-dimensional viewing.

A three dimensional electronic aquarium is shown and described. The three dimensional electronic aquarium includes an aquarium tank comprised of a base having a front wall rising therefrom. The front wall is transparent. A three dimensional television secured in a back portion of the aquarium tank opposite the front wall. The three dimensional television will display at least one fish. A mirror positioned along a bottom portion of the three dimensional television.

An image display device according to the present disclosure includes: one or more image sources that output a two-dimensional projection image; and one or more image deflection sections that generate a plurality of area images by dividing the projection image from the image source into a plurality of areas at least in a horizontal direction, and deflects and projects, toward a screen having anisotropic diffusion properties, the plurality of area images at respective angles different from each other to partially overlap the plurality of area images with each other on the screen and thereby display images from a plurality of viewpoints.

The problem of 3D panel display systems either (a) requiring special glasses to separate left and right viewing images, or (b) having auto-stereoscopic 3D with compromised fidelity, is solved by providing a projection three dimensional (3D) display system for providing glass-free, 3D display to a plurality of viewing volumetric pairs (VVAs) in space corresponding to a hypothetical plurality of viewers' eye aperture pairs, the projection 3D display system comprising: (a) a dual-image projector configured to project both a left viewing tri-color image and a right viewing tri-color image; and (b) means for (1) receiving a tri-color mixed input beam encompassing the left and right viewing tri-color images, (2) multiplying the tri-color mixed input beam into a plurality of tri-color mixed output beams, and (3) focusing the plurality of tri-color mixed beams for viewing at the VVAs.

The problem of 3D panel display systems either (a) requiring special glasses to separate left and right viewing images, or (b) having auto-stereoscopic 3D with compromised fidelity, is solved by providing a projection three dimensional (3D) display system for providing glass-free, 3D display to a plurality of viewing volumetric pairs (VVAs) in space corresponding to a hypothetical plurality of viewers' eye aperture pairs, the projection 3D display system comprising: (a) a dual-image projector configured to project both a left viewing tri-color image and a right viewing tri-color image; and (b) means for (1) receiving a tri-color mixed input beam encompassing the left and right viewing tri-color images, (2) multiplying the tri-color mixed input beam into a plurality of tri-color mixed output beams, and (3) focusing the plurality of tri-color mixed beams for viewing at the VVAs.