A holographic screen is a two-dimensional display technology that uses coated glass media for the projection surface of a video projector. "Holographic" refers not to a stereoscopic effect, but to the coating that bundles light using formed microlenses. The lens design and attributes match the holographic area. The lenses may appear similar to the Fresnel lenses used in overhead projectors. The resulting effect is that of a free-space display, because the image carrier appears very transparent. Additionally, the beam manipulation by the lenses can be used to make the image appear to be floating in front of or behind the glass, rather than directly on it. However, this display is only two-dimensional and not true three-dimensional. It is unclear if such a technology will be able to provide acceptable three-dimensional images in the future.
The display design can use either front or rear projection, in which one or more video projectors are directed at the glass plate. Each projector's beam widens as it approaches the surface and then is bundled again by the lenses' arrangement on the glass. This forms a virtual point of origin, so that the image source appears to be an imaginary object somewhere close to the glass. In rear projection (the common use case), the light passes through the glass; in front projection it is reflected.
Interactive holographic screensedit
Basic scheme of interactive holographic screens
Interactive holographic screens add gesture support to holographic screens. These systems contain three basic components:
The computer sends the image to the projector. The projector generates light beams which form the image on the screen. When the user touches the screen, a tactile membrane film reacts to these movements, generating electrical impulses that are sent back to the computer. The computer interprets the received impulses and modifies the projected image according to the information.
The projector generates the beams of light that will form the image on the screen's film, which is adhered to the crystal support. These crystal lenses can be a maximum of 16 millimeters (0.63 in) across. The projector is usually located behind the screen and must be placed a certain angle above or below the user's line of sight to avoid the dazzling the user. Therefore, it must be trapezoidal projector, so it can compensate for the deforming of the images at this angle of displacement.
The films are thin sheets of plastic applied to the crystal that allow both visualization and interactivity. There are two types of films:
Screen film: This film can be opaque or transparent. It is possible to work with different degrees of opacity that can vary between 90% and 98%, depending on the application (interior, exterior, natural lighting, artificial lighting, etc.).
Tactile membrane: This film enables interactivity. Capacitive projected technology[1] catches user gestures and sends impulses to the computer.
Usesedit
Most initial uses of this technology are advertising-related, such as shop windows.[2] An interactive holographic screen can be mounted on the shop windows so that passersby can interact with it. Non-interactive holographic screens in shop windows can be coupled with artificial vision software to adapt ads based on the viewer's characteristics (age, sex, etc.).
These types of screens are often used for the display of Vocaloids at concerts because they simulate the illusion of a holographically-projected virtual performer.
holographic, screen, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, decemb. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Holographic screen news newspapers books scholar JSTOR December 2009 Learn how and when to remove this template message A holographic screen is a two dimensional display technology that uses coated glass media for the projection surface of a video projector Holographic refers not to a stereoscopic effect but to the coating that bundles light using formed microlenses The lens design and attributes match the holographic area The lenses may appear similar to the Fresnel lenses used in overhead projectors The resulting effect is that of a free space display because the image carrier appears very transparent Additionally the beam manipulation by the lenses can be used to make the image appear to be floating in front of or behind the glass rather than directly on it However this display is only two dimensional and not true three dimensional It is unclear if such a technology will be able to provide acceptable three dimensional images in the future Contents 1 Working principle 2 Interactive holographic screens 3 Uses 4 See also 5 ReferencesWorking principle editThe display design can use either front or rear projection in which one or more video projectors are directed at the glass plate Each projector s beam widens as it approaches the surface and then is bundled again by the lenses arrangement on the glass This forms a virtual point of origin so that the image source appears to be an imaginary object somewhere close to the glass In rear projection the common use case the light passes through the glass in front projection it is reflected Interactive holographic screens edit nbsp Basic scheme of interactive holographic screensInteractive holographic screens add gesture support to holographic screens These systems contain three basic components A projector A computer Two filmsThe computer sends the image to the projector The projector generates light beams which form the image on the screen When the user touches the screen a tactile membrane film reacts to these movements generating electrical impulses that are sent back to the computer The computer interprets the received impulses and modifies the projected image according to the information The projector generates the beams of light that will form the image on the screen s film which is adhered to the crystal support These crystal lenses can be a maximum of 16 millimeters 0 63 in across The projector is usually located behind the screen and must be placed a certain angle above or below the user s line of sight to avoid the dazzling the user Therefore it must be trapezoidal projector so it can compensate for the deforming of the images at this angle of displacement nbsp Thin filmThe films are thin sheets of plastic applied to the crystal that allow both visualization and interactivity There are two types of films Screen film This film can be opaque or transparent It is possible to work with different degrees of opacity that can vary between 90 and 98 depending on the application interior exterior natural lighting artificial lighting etc Tactile membrane This film enables interactivity Capacitive projected technology 1 catches user gestures and sends impulses to the computer Uses editMost initial uses of this technology are advertising related such as shop windows 2 An interactive holographic screen can be mounted on the shop windows so that passersby can interact with it Non interactive holographic screens in shop windows can be coupled with artificial vision software to adapt ads based on the viewer s characteristics age sex etc These types of screens are often used for the display of Vocaloids at concerts because they simulate the illusion of a holographically projected virtual performer See also edit3D display Free space display Large screen television technology Phantasmagoria Rear projection television Video projectorReferences edit capacitive projected technology Archived from the original on 2009 12 08 Retrieved 2009 12 19 interactive shop windows Adwindow adhesive projection screens In English Spanish French Eresmultimedia In Spanish Globalzepp In Spanish Iberhermes permanent dead link Orizom In Spanish MediaScreen GmbH Germany Retrieved from https en wikipedia org w index php title Holographic screen amp oldid 1192131691, wikipedia, wiki, book, books, library,
