Patents by Inventor Ammar Derraa

Ammar Derraa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20010005594
    Abstract: A method of fabricating a field emission array to facilitate optimization of the size of grid openings. The method also minimizes the occurrence of electrical shorts between the cathode and anode grid of the field emission array. In the method of the present invention, a first layer of dielectric material is disposed over a substrate and emitter tips of the field emission array. A second layer is disposed over the first layer and subsequently planarized to expose regions of the first layer that are located above the emitter tips. Dielectric material of the first layer may be removed through openings of the second layer to expose a top portion of each of the emitter tips. The second layer is then substantially removed from the first layer. Planarization and removal of the second layer may reduce any conductive defects that extend through the first layer. A third layer, which comprises dielectric material, is disposed over the first layer.
    Type: Application
    Filed: February 20, 2001
    Publication date: June 28, 2001
    Inventor: Ammar Derraa
  • Patent number: 6235545
    Abstract: In one aspect, the invention encompasses a method of treating the end portions of an array of substantially upright silicon-comprising structures. A substrate having a plurality of substantially upright silicon-comprising structures extending thereover is provided. The substantially upright silicon-comprising structures have base portions, and have end portions above the base portions. A masking layer is formed over the substrate to cover the base portions of the substantially upright silicon-comprising structures while leaving the end portions exposed. The end portions are then exposed to conditions which alter the end portions relative to the base portions. In another aspect, the invention encompasses a method of treating the ends of an array of silicon-comprising emitter structures. A substrate having a plurality of silicon-comprising emitter structures thereover is provided. The emitter structures have base portions and ends above the base portions. A layer of spin-on-glass is formed over the substrate.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: May 22, 2001
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6210985
    Abstract: A method of fabricating field emission arrays which employs a single mask to define emitter tips and their corresponding resistors. Column lines may also be defined without requiring the use of an additional mask. The method includes disposing substantially mutually parallel conductive lines onto a substrate of the field emission array. The conductive lines may be patterned from a layer of conductive material or selectively deposited onto the substrate. One or more material layers from which the emitter tips and resistors will be defined are disposed onto the conductive lines and the regions of substrate exposed between adjacent conductive lines. The exposed surface of the layer or layers of emitter tip and resistor material or materials may be planarized. A mask is disposed over the substantially planar surface.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: April 3, 2001
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6204077
    Abstract: A method of fabricating row lines over a field emission array. The method employs only two mask steps to define row lines and pixel openings through selected regions of each of the row lines. In accordance with the method of the present invention, a layer of conductive material is disposed over a substantially planarized surface of a grid of semiconductive material. A layer of passivation material is then disposed over the layer of conductive material. In one embodiment of the method, a first mask may be employed to remove passivation material and conductive material from between adjacent rows of pixels and from substantially above each of the pixels of the field emission array. A second mask is employed to remove semiconductive material from between the adjacent rows of pixels. In another embodiment of the method, a first mask is employed to facilitate removal of passivation material, conductive material, and semiconductive material from between adjacent rows of pixels of the field emission array.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: March 20, 2001
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6197607
    Abstract: A method of fabricating a field emission array to facilitate optimization of the size of grid openings. The method also minimizes the occurrence of electrical shorts between the cathode and anode grid of the field emission array. In the method of the present invention, a first layer of dielectric material is disposed over a substrate and emitter tips of the field emission array. A second layer is disposed over the first layer and subsequently planarized to expose regions of the first layer that are located above the emitter tips. Dielectric material of the first layer may be removed through openings of the second layer to expose a top portion of each of the emitter tips. The second layer is then substantially removed from the first layer. Planarization and removal of the second layer may reduce any conductive defects that extend through the first layer. A third layer, which comprises dielectric material, is disposed over the first layer.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: March 6, 2001
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6133057
    Abstract: A method of fabricating a field emission array that employs a single mask to define the emitter tips thereof and their corresponding resistors. A layer of conductive material is disposed over a substrate of the field emission array. A plurality of substantially mutually parallel conductive lines is defined from the layer of conductive material. At least one layer of semiconductive material or conductive material is disposed over the conductive lines and over the regions of the substrate exposed between adjacent conductive lines. A mask material is disposed over the layer of semiconductive material or conductive material, substantially above each of the conductive lines. Portions of the layer of semiconductive material or conductive material exposed through the mask material may be removed to expose substantially longitudinal center portions of the conductive lines. Other portions of the layer of semiconductive material or conductive material may remain over peripheral lateral edges of the conductive lines.
    Type: Grant
    Filed: December 27, 1999
    Date of Patent: October 17, 2000
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6124665
    Abstract: A method of fabricating row lines over a field emission array. The method employs only two mask steps to define row lines and pixel openings through selected regions of each of the row lines. In accordance with the method of the resent invention, a layer of conductive material is disposed over a substantially planarized surface of a grid of semiconductive material. A layer of passivation material is then disposed over the layer of conductive material. In one embodiment of the method, a first mask may be employed to remove passivation material and conductive material from between adjacent rows of pixels and from substantially above each of the pixels of the field emission array. A second mask is employed to remove semiconductive material from between the adjacent rows of pixels. In another embodiment of the method, a first mask is employed to facilitate removal of passivation material, conductive material, and semiconductive material from between adjacent rows of pixels of the field emission array.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: September 26, 2000
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6121722
    Abstract: A method of fabricating row lines over a field emission array. The method employs only two mask steps to define row lines and pixel openings through selected regions of each of the row lines. In accordance with the method of the present invention, a layer of conductive material is disposed over a substantially planarized surface of a grid of semiconductive material. A layer of passivation material is then disposed over the layer of conductive material. In one embodiment of the method, a first mask may be employed to remove passivation material and conductive material from between adjacent rows of pixels and from substantially above each of the pixels of the field emission array. A second mask is employed to remove semiconductive material from between the adjacent rows of pixels. In another embodiment of the method, a first mask is employed to facilitate removal of passivation material, conductive material, and semiconductive material from between adjacent rows of pixels of the field emission array.
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: September 19, 2000
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6059625
    Abstract: A method of fabricating a field emission array that employs a single mask to define the emitter tips thereof and their corresponding resistors. A layer of conductive material is disposed over a substrate of the field emission array. A plurality of substantially mutually parallel conductive lines is defined from the layer of conductive material. At least one layer of semiconductive material or conductive material is disposed over the conductive lines and over the regions of the substrate exposed between adjacent conductive lines. A mask material is disposed over the layer of semiconductive material or conductive material, substantially above each of the conductive lines. Portions of the layer of semiconductive material or conductive material exposed through the mask material may be removed to expose substantially longitudinal center portions of the conductive lines. Other portions of the layer of semiconductive material or conductive material may remain over peripheral lateral edges of the conductive lines.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: May 9, 2000
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6017772
    Abstract: A method of fabricating field emission arrays which employs a single mask to define emitter tips and their corresponding resistors. Column lines may also be defined without requiring the use of an additional mask. The method includes disposing substantially mutually parallel conductive lines onto a substrate of the field emission array. The conductive lines may be patterned from a layer of conductive material or selectively deposited onto the substrate. One or more material layers, from which the emitter tips and resistors will be defined, are disposed onto the conductive lines and the regions of substrate exposed between adjacent conductive lines. The exposed surface of the layer or layers of emitter tip and resistor material or materials may be planarized. A mask is disposed over the substanitially planar surface.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: January 25, 2000
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa
  • Patent number: 6008063
    Abstract: A method of fabricating row lines over a field emission array. The method employs only two mask steps to define row lines and pixel openings through selected regions of each of the row lines. In accordance with the method of the present invention, a layer of conductive material is disposed over a substantially planarized surface of a grid of semiconductive material. A layer of passivation material is then disposed over the layer of conductive material. In one embodiment of the method, a first mask may be employed to remove passivation material and conductive material from between adjacent rows of pixels and from substantially above each of the pixels of the field emission array. A second mask is employed to remove semiconductive material from between the adjacent rows of pixels. In another embodiment of the method, a first mask is employed to facilitate removal of passivation material, conductive material, and semiconductive material from between adjacent rows of pixels of the field emission array.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: December 28, 1999
    Assignee: Micron Technology, Inc.
    Inventor: Ammar Derraa