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TWO-AXIS ENCODING OF INDEPENDENTLY ADDRESABLE IMAGES IN HOLGRAPHIC DISPLAYS

IP.com Disclosure Number: IPCOM000025931D
Original Publication Date: 1989-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 155K

Publishing Venue

Xerox Disclosure Journal

Abstract

Holographic displays are known in which a plurality of separate images are formed in the same holographic medium. The medium is then illuminated by an array of light sources one for each image stored in the display. A viewer looks into the hologram and sees a virtual-image reconstructed. The reconstructing light sources are white light sources such as light bulbs which can be independently controlled for illumination of the holographic display which will selectively reconstruct a specific portion of the composite image. The different colors are formed by filters which transmit the appropriate wavelength. The table below gives an example of how the individually addressable images might be used to dis lay four areas of an office copier.

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KEROX DISCLOSURE JOURNAL

ICOLOR-, REFERENCE

.I ANGLE .I

TWO-AXIS ENCODING OF Proposed Classification INDEPENDENTLY ADDRESABLE US. C1.355114R IMAGES IN HOLGRAPHIC DISPLAYS
John Andrews
Reinhart Damm
Howard Stark
Werner Haas

Int. C1. G03g 15/00

RED GREEN BLUE

Holographic displays are known in which a plurality of separate images are formed in the same holographic medium. The medium is then illuminated by an array of light sources one for each image stored in the display. A viewer looks into the hologram and sees a virtual-image reconstructed. The reconstructing light sources are white light sources such as light bulbs which can be independently controlled for illumination of the holographic display which will selectively reconstruct a specific portion of the composite image. The different colors are formed by filters which transmit the appropriate wavelength. The table below gives an example of how the individually addressable images might be used to dis lay four areas of an office copier.

could be independently illuminated or not illuminated, in 2,3-red and 1,2,3- green. Error messages could then be provided which further specify the location of a problem and describe graphically or with text how to correct it. Variable light intensity could also be an aid in optimum display understandability

Image 1-red is an outline of the machine P rame. Other parts and subsystems

L I

1 Machine Paper path Error 1

2 Document Fuser Error 2

Outline Location Handler Location Outline

I I I I 1

3 Document Paper tray Error 3

Feed Outline Location

Volume 14 Number 1 January/February 1989 2 5.

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TWO-AXIS ENCODING OF- INDEPENDENTLY ADDRESABLE IMAGES IN HOLGRAPHIC DISPLAYS (Cont'd)

Minimizing the number of holograms stored is desirable to reduce the complexity of the final composite. One way of accomplishing this is to use a hybrid display which has both a multiplexed hologram as described above and another simple display based on liquid crystal, LED, vacuum florescent, or other technology. The hologram would have each machine subsystem outline independently addressable with locator labels included. The auxiliary display could then identify the specific fault in the illuminated subsystem and convey other critical system status information.

A large number of stored holograms might not be desirable because of the reduced diffraction efficiency and the large number of independent light sources. Increased diffraction efficiency can be obtained b recording a

the holograms positioned immediately in contact and sandwiched be tween supporting media. There are several possible simplifications to the light source array. One favorable configuration involves a stack of several guest- host liquid cr...