Browse Prior Art Database

Amorphous Chalcogenide as a Display Device

IP.com Disclosure Number: IPCOM000079864D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

von Gutfeld, RJ: AUTHOR [+2]

Abstract

It is suggested that crystalline transformation of an amorphous chalcogenide be utilized as a means of temporarily storing information for displays.

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Amorphous Chalcogenide as a Display Device

It is suggested that crystalline transformation of an amorphous chalcogenide be utilized as a means of temporarily storing information for displays.

It is known that short laser pulses can be utilized to write and erase areas of amorphous chalcogenide material. See J. Feinleib et al, Appl. Phys. Letters 18, 254 (1971) and "Laser Writing and Erasing on Chalcogenide Films," J. Appl. Phys., Nov. 1972. It has been observed that for certain compositions of TeGeAs, highly rich in Te (approx. 93% Te, sputtered material) the so-called reverse mode of writing has a very special characteristic; an amorphized area does not stay amorphized for more than a fraction of a minute. It thus becomes possible to use this material as a short-term memory which requires no erasing beam. Information can be put in an area with a programmed laser beam and displayed long enough for the information to be photographed or recorded visually. If the information is needed for a longer period of time, the material can be refreshed by rescanning the same area in the same manner. If the information is no longer required, fading will take place at room temperature. The material is then ready for a new display.

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