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Browse Prior Art Database

Display Device

IP.com Disclosure Number: IPCOM000096593D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Young, JER: AUTHOR

Abstract

The display device has a transparent solid substrate which carries a rough-surfaced shape of the object, e.g., a character, to be displayed. With side illumination, light is scattered by the rough surface. The object is visible if the refractive indexes of the substrate and the surrounding transparent fluid medium differ considerably from each other. If their refractive indexes are either the same or nearly the same, there is no scattering of light and the object remains invisible.

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Display Device

The display device has a transparent solid substrate which carries a rough- surfaced shape of the object, e.g., a character, to be displayed. With side illumination, light is scattered by the rough surface. The object is visible if the refractive indexes of the substrate and the surrounding transparent fluid medium differ considerably from each other. If their refractive indexes are either the same or nearly the same, there is no scattering of light and the object remains invisible.

The display device is controlled by displacement of the surrounding fluid medium having the same refractive index as that of the substrate by another with a different refractive index. For example, the refractive indexes of the following solid-liquid combinations are identical. glass-chlorobenzene, polymethylmethacrylate-carbontetrachloride or methylbromide.

To display more than one object either alternately or in super position, several cells of the display device are provided which are stacked one in front of another and selectively operated. A common light source can be used.

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