DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Apparatus for sensing patterns of electrical field variations across a surface

Abstract

An array of nonvolatile field effect transistors used to sense electric potential variations. The transistors owe their nonvolatility to the movement of protons within the oxide layer that occurs only in response to an externally applied electric potential between the gate on one side of the oxide and the source/drain on the other side. The position of the protons within the oxide layer either creates or destroys a conducting channel in the adjacent source/channel/drain layer below it, the current in the channel being measured as the state of the nonvolatile memory. The protons can also be moved by potentials created by other instrumentalities, such as charges on fingerprints or styluses above the gates, pressure on a piezoelectric layer above the gates, light shining upon a photoconductive layer above the gates. The invention allows sensing of fingerprints, handwriting, and optical images, which are converted into digitized images thereof in a nonvolatile format.

Inventors:
 [1];  [2]
  1. Arlington, VA
  2. Paris, FR
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
OSTI Identifier:
874063
Patent Number(s):
6304666
Assignee:
The United States of America as represented by the United States Department (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING
G - PHYSICS G06 - COMPUTING G06K - RECOGNITION OF DATA
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; sensing; patterns; electrical; field; variations; surface; array; nonvolatile; effect; transistors; sense; electric; potential; nonvolatility; movement; protons; oxide; layer; occurs; response; externally; applied; gate; sourcedrain; position; creates; destroys; conducting; channel; adjacent; sourcechanneldrain; below; current; measured; memory; moved; potentials; created; instrumentalities; charges; fingerprints; styluses; gates; pressure; piezoelectric; light; shining; photoconductive; allows; handwriting; optical; images; converted; digitized; format; oxide layer; effect transistor; /382/

Citation Formats

Warren, William L, and Devine, Roderick A. B. Apparatus for sensing patterns of electrical field variations across a surface. United States: N. p., 2001. Web.
Warren, William L, & Devine, Roderick A. B. Apparatus for sensing patterns of electrical field variations across a surface. United States.
Warren, William L, and Devine, Roderick A. B. Mon . "Apparatus for sensing patterns of electrical field variations across a surface". United States. https://www.osti.gov/servlets/purl/874063.
@article{osti_874063,
title = {Apparatus for sensing patterns of electrical field variations across a surface},
author = {Warren, William L and Devine, Roderick A. B.},
abstractNote = {An array of nonvolatile field effect transistors used to sense electric potential variations. The transistors owe their nonvolatility to the movement of protons within the oxide layer that occurs only in response to an externally applied electric potential between the gate on one side of the oxide and the source/drain on the other side. The position of the protons within the oxide layer either creates or destroys a conducting channel in the adjacent source/channel/drain layer below it, the current in the channel being measured as the state of the nonvolatile memory. The protons can also be moved by potentials created by other instrumentalities, such as charges on fingerprints or styluses above the gates, pressure on a piezoelectric layer above the gates, light shining upon a photoconductive layer above the gates. The invention allows sensing of fingerprints, handwriting, and optical images, which are converted into digitized images thereof in a nonvolatile format.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}