Browse Prior Art Database

Parallax Eliminating Structure

IP.com Disclosure Number: IPCOM000086494D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Luderus, FJ: AUTHOR

Abstract

Display structure 1 comprises gas discharge display panel 2 and protective, transparent shield 3, positioned at some distance in front of panel 2. Shield 3 is provided with mask 4, having appropriately labeled windows 5A, 5B, and 5C, in horizontal registration with character matrix positions 6A, 6B, and 6C in panel 2, that are used as indicators, i.e., all matrix dots being excited or extinguished.

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Parallax Eliminating Structure

Display structure 1 comprises gas discharge display panel 2 and protective, transparent shield 3, positioned at some distance in front of panel 2. Shield 3 is provided with mask 4, having appropriately labeled windows 5A, 5B, and 5C, in horizontal registration with character matrix positions 6A, 6B, and 6C in panel 2, that are used as indicators, i.e., all matrix dots being excited or extinguished.

When panel 2 is observed below an angle of about 35 degrees (operator in sitting position and panel positioned vertically on the top of a desk), the indicator matrix being viewed through the window for the next higher indicator, i.e., indicator 6B through window 5A, a parallax eliminating structure 7 is positioned between each indicator matrix 6 and its corresponding window 5.

Parallax eliminating structure 7 comprises a transparent body 8, which has convex outer surface 9 for concentrating light originating from an indicator matrix
6. It also has an optically flat, tilted surface 10 for directing transmitted light in an upward direction.

Radius R is thus chosen so that any light ray emanating from the corresponding indicator matrix is transmitted normal to the surface of panel 2. The tilt angle is thus determined by Snell's law wherein the emerging rays travel under 35 degrees with relation to the horizontal plane.

An array of structures 7 may be molded in one piece, having two elongated side flanges with the parallax eliminating structu...