Browse Prior Art Database

Multiviewer Gas Panel

IP.com Disclosure Number: IPCOM000086693D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR

Abstract

Certain applications, such as point of sale, make a two-directional display at 90 degrees desirable whereby a second viewer, the customer, can view the display at the same time as the original viewer, the checkout clerk.

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Multiviewer Gas Panel

Certain applications, such as point of sale, make a two-directional display at 90 degrees desirable whereby a second viewer, the customer, can view the display at the same time as the original viewer, the checkout clerk.

Referring to the figure, a panel display such as a gaseous-discharge display device has a direct viewing surface 1. A front surface mirror 3 having a silvered surface 5 is positioned at the rear of the display at a 45 degree angle to provide a 90 degree rotation of the rear image, the double reversal or inversion of the image providing a true image display at display surface 7 but rotated 90 degrees for the second viewer. However, when using a mirror in such an arrangement, the images of the viewers or other background images within the field of view of the mirror will also be transmitted to the other.

To eliminate this problem and prevent pickup of nondisplay images, a cross polarizer technique is used in which a single polarizer comprising a conventional glass on plastic film is positioned in front of each display but so polarized that the light entering each display is polarized at 90 degrees with respect to that generated by the display, i.e., the plane of polarization of one of the polarizers is polarized 90 degrees from the plane of polarization of the other. Polarizer 9 is associated with the original display 1, while polarizer 11 is associated with the display 7 of the second viewer, the crossed polarizers functionin...