Browse Prior Art Database

Bright and Versatile Magnetic Bubble Display Screen

IP.com Disclosure Number: IPCOM000081254D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Lin, BJ: AUTHOR

Abstract

Described is a display device wherein a magnetic bubble array is combined with and viewed through a fly's eye lens. The loosely packed small bubbles of the array are magnified by the fly's eye lens so that they appear large and closely packed, enabling the versatile simulation of arbitrary patterns. Light absorption is decreased by the use of permissibly thin small-bubble materials. Since the bubbles are loosely packed, they are easily propagated and manipulated and the convenient T-I bar type propagation circuit can be used.

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Bright and Versatile Magnetic Bubble Display Screen

Described is a display device wherein a magnetic bubble array is combined with and viewed through a fly's eye lens. The loosely packed small bubbles of the array are magnified by the fly's eye lens so that they appear large and closely packed, enabling the versatile simulation of arbitrary patterns. Light absorption is decreased by the use of permissibly thin small-bubble materials. Since the bubbles are loosely packed, they are easily propagated and manipulated and the convenient T-I bar type propagation circuit can be used.

Fig. 1 shows a transmissive display screen. The illuminating light is linearly polarized by the polarizer. The propagation circuit can be made by etching into the bubble material and index-matching with a suitable liquid. The analyzer reveals the bubbles which appear to be much larger and closely packed, when viewed through the fly's eye lens. When multiple layers of bubble materials are used, a multitone display can be generated.

Fig. 2 shown a reflective display. In this case, the polarizer is also used as the analyzer. Linearly polarized light is rotated 90 degrees after passing through the quarter-wave plate twice. Since the propagation circuit is placed behind the reflective layer, the popular opaque permalloy material can be used. If the etched T-I pattern for the transmission screen is used, the propagation circuit is placed between the quarter-wave plate and the bubble material.

Fig...