Display holograms are widely used as a powerful tool
wherever an audience needs to be reached. They are popular and used
frequently for eye-catching displays at trade fairs or presentations-a
truly unique and amazing way to present objects, corporate images,
educational materials and many more. This type of hologram is recorded
on to a photographic glass or film plate. The photograph of a virtual
object reproduces real 3D magic in display hologram. Display holography
is basically a large-scale holography which can play a vital role to get
the impact and attention you have been seeking.
As it is, we all know that holograms are used for that "extra"
effect and look, and display holography enlarges this effect many times
over. If you need to grab a anyone's attention then display holography
is your all-time solution.
Display holograms have certain characteristics like
as follows:
- Exclusivity
- High artistic value
- Extreme plastic representation
- Availability in various sizes starting from a small stamp size
image to the size of an entrance door or even more.
The striking three dimensional properties of
holograms make them ideal for displays. Display holograms can produce
spectacular displays for educational, medical, scientific, artistic and
commercial purposes. Holographic displays have one great advantage of
avoiding the risk of theft of art objects. The same object can be
displayed at several places at the same time, which in turn implies that
there is much wider exposure of rare items.
Display holograms are widely used in the following:
- 3D Poster & Display
- Product Enhancement
- Pop-up Display
- Sales Presentation
- Celebrity Product Endorsement
- Mixed Media Display
- 3D Portraiture: VIPs, Gods, Family, Celebrities, Children,
Wedding
- Trade shows
- Store Fronts
- Science Centers
- Reproduction of Museum Exhibits and Archival Artifact
- Recording, Artistic Development & Teaching
- Museums
- Educational Institutions
- Lobbies
- Expositions
- Public Spaces
An ideal display hologram should meet certain
requirements, such as follows:
- White Light Viewable Image: The display holograms should
be preferably viewed with a light source which is white. Finite size
of the source creates blur in the image. When we talk about a
typical white light source, it is the sun. The sun light is
equivalent to the case of reconstructing a hologram from a distance
or length of one meter using a white light source of 9 mm diameter.
The blurred image is around 0.6 mm for an image point at distance of
10 cm from the hologram. In other light sources, the apparent size
of the source can be reduced.
- Focused Image: When the hologram is viewed by a white
light source, the image should appear to be well focused. The image
is blurred due to the finite size of the source and its spectral
bandwidth. The blurring of the image increases with the increase in
the distance of the image point from the hologram. The average
distance of the image from the hologram can be minimized. This is
done when the image straddles the hologram plane.
- Wide Field-of-View: The field-of-view of the hologram
should be wide to allow a large parallax. The vertical field-of-view
may be restricted but the horizontal field must be large.
- High Resolution: The display hologram should produce an
image with excellent sharpness.
- Low Image Aberrations: The image of the display hologram
must be aberration free and without distortions. The image should
not move as the observer moves up or down or sideways in the field.
- Low Background Noise: Background noise has a drawback of
reducing the contrast of the image. The processing chemistry should
not introduce scattering noise. Background noise (flare light) is
also introduced by Interference between light scattered by different
parts of the body.
- True Color: The display hologram should produce the image
with true color. For monochrome object, while a display with only
one color gives satisfactory results for many purposes, the addition
of false colors can improve the display.
- Ambience: Another important requirement is that hologram
should display the image as acceptably bright-with proper contrast
in high ambient light brightness.
- Hologram Durability: The display hologram medium should
be resistant to
- humidity
- heat
- temperature
- intense light
- abrasion