Patents by Inventor William C. McDonald
William C. McDonald 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).
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Publication number: 20240134254Abstract: A device includes a spatial light modulator (SLM) and a light shield. The SLM has first and second opposing sides and third and fourth opposing sides. The SLM includes an array of pixel elements. The SLM also includes reflective elements along the first side. At least some of the reflective elements have a metal layer. The light shield has a first portion adjacent the reflective elements. A gap between the metal layers and the light shield has a zig-zag shape.Type: ApplicationFiled: April 6, 2023Publication date: April 25, 2024Inventors: WILLIAM C. MCDONALD, BRADLEY HASKETT, MICHAEL DAVIS
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Patent number: 11932529Abstract: In described examples, a microelectromechanical system (MEMS) includes a first element and a second element. The first element is mounted on a substrate and has a first contact surface. The second element is mounted on the substrate and has a second contact surface that protrudes from the second element to form an acute contact surface. The first element and/or the second element is/are operable to move in: a first direction, such that the first contact surface comes in contact with the second contact surface; and a second direction, such that the second contact surface separates from the first contact surface.Type: GrantFiled: March 10, 2020Date of Patent: March 19, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Patrick Ian Oden, James Carl Baker, Sandra Zheng, William C. McDonald
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Publication number: 20210181499Abstract: An integrated circuit includes an electrode voltage controller, a micro-electromechanical system (MEMS) structure, and a bias voltage generator. The MEMS structure has a first electrode, a conductive plate, and a reflective layer on the conductive plate. The first electrode is coupled to the electrode voltage controller, and the conductive plate is configured to move vertically with respect to the first electrode responsive to a voltage generated by the electrode voltage controller and applied to the first electrode. The bias voltage generator is coupled to the conductive plate. The bias voltage generator has an input configured to receive a bias control signal. The bias voltage generator is configured to apply a non-zero bias voltage to the conductive plate responsive to the bias control signal.Type: ApplicationFiled: December 14, 2020Publication date: June 17, 2021Inventors: Patrick Ian Oden, James Norman Hall, William C. McDonald
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Publication number: 20200207608Abstract: In described examples, a microelectromechanical system (MEMS) includes a first element and a second element. The first element is mounted on a substrate and has a first contact surface. The second element is mounted on the substrate and has a second contact surface that protrudes from the second element to form an acute contact surface. The first element and/or the second element is/are operable to move in: a first direction, such that the first contact surface comes in contact with the second contact surface; and a second direction, such that the second contact surface separates from the first contact surface.Type: ApplicationFiled: March 10, 2020Publication date: July 2, 2020Inventors: Patrick Ian Oden, James Carl Baker, Sandra Zheng, William C. McDonald
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Patent number: 10589980Abstract: In described examples, a microelectromechanical system (MEMS) includes a first element and a second element. The first element is mounted on a substrate and has a first contact surface. The second element is mounted on the substrate and has a second contact surface that protrudes from the second element to form an acute contact surface. The first element and/or the second element is/are operable to move in: a first direction, such that the first contact surface comes in contact with the second contact surface; and a second direction, such that the second contact surface separates from the first contact surface.Type: GrantFiled: April 7, 2017Date of Patent: March 17, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Patrick Ian Oden, James Carl Baker, Sandra Zheng, William C. McDonald
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Publication number: 20180290880Abstract: In described examples, a microelectromechanical system (MEMS) includes a first element and a second element. The first element is mounted on a substrate and has a first contact surface. The second element is mounted on the substrate and has a second contact surface that protrudes from the second element to form an acute contact surface. The first element and/or the second element is/are operable to move in: a first direction, such that the first contact surface comes in contact with the second contact surface; and a second direction, such that the second contact surface separates from the first contact surface.Type: ApplicationFiled: April 7, 2017Publication date: October 11, 2018Inventors: Patrick Ian Oden, James Carl Baker, Sandra Zheng, William C. McDonald
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Patent number: 9966194Abstract: A MEMs actuator device and method of forming includes arrays of actuator elements. Each actuator element has a moveable top plate and a bottom plate. The top plate includes a central membrane member and a cantilever spring for movement of the central membrane member. The bottom plate consists of two RF signal lines extending under the central membrane member. A MEMs electrostatic actuator device includes a CMOS wafer, a MEMs wafer, and a ball bond assembly. Interconnections are made from a ball bond to an associated through-silicon-via (TSV) that extends through the MEMS wafer. A RF signal path includes a ball bond electrically connected through a TSV and to a horizontal feed bar and from the first horizontal feed bar vertically into each column of the array. A metal bond ring extends between the CMOS wafer and the MEMS wafer. An RF grounding loop is completed from a ground shield overlying the array to the metal bond ring, a TSV and to a ball bond.Type: GrantFiled: December 20, 2016Date of Patent: May 8, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Arun Gupta, William C. McDonald, Adam Fruehling, Ivan Kmecko, Lance Barron, Divyanshu Agrawal, Arthur M. Turner, John C. Ehmke
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Patent number: 9864188Abstract: A method of forming a micro-electromechanical systems (MEMS) pixel, such as a DMD type pixel, by forming a substrate having a non-planar upper surface, and depositing a photoresist spacer layer upon the substrate. The spacer layer is exposed to a grey-scale lithographic mask to shape an upper surface of the spacer layer. A control member is formed upon the planarized spacer layer, and an image member is formed over the control member. The image member is configured to be positioned as a function of the control member to form a spatial light modulator (SLM). The spacer layer is planarized by masking a selected portion of the spacer layer with a grey-scale lithographic mask to remove binge in the selected portion.Type: GrantFiled: November 3, 2014Date of Patent: January 9, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Patrick I. Oden, James C. Baker, Sandra Zheng, William C. McDonald, Lance W. Barron
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Patent number: 9709802Abstract: In described examples, a DMD includes an array of micromirror pixels. Each pixel includes a right electrode on a first side of the pixel, a left electrode on a second side of the pixel adjacent the first side, and a cantilevered beam supporting a mirror. The cantilever beam tilts on two axes of translation: pitch and roll. The mirror has: a first landed position (on a first and second spring tip) over the right electrode; and a second landed position (on the first and a third spring tip) over the left electrode, such that the first landed position and the second landed positions are 90° apart. In transitioning from the first landed position to the second landed position, the mirror maintains contact with the first spring tip while rolling from the second spring tip to the third spring tip.Type: GrantFiled: May 20, 2016Date of Patent: July 18, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: William C. McDonald, James N. Hall, Mark F. Reed, Lance W. Barron, Terry A. Bartlett, Divyanshu Agrawal
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Publication number: 20170098509Abstract: A MEMs actuator device and method of forming includes arrays of actuator elements. Each actuator element has a moveable top plate and a bottom plate. The top plate includes a central membrane member and a cantilever spring for movement of the central membrane member. The bottom plate consists of two RF signal lines extending under the central membrane member. A MEMs electrostatic actuator device includes a CMOS wafer, a MEMs wafer, and a ball bond assembly. Interconnections are made from a ball bond to an associated through-silicon-via (TSV) that extends through the MEMS wafer. A RF signal path includes a ball bond electrically connected through a TSV and to a horizontal feed bar and from the first horizontal feed bar vertically into each column of the array. A metal bond ring extends between the CMOS wafer and the MEMS wafer. An RF grounding loop is completed from a ground shield overlying the array to the metal bond ring, a TSV and to a ball bond.Type: ApplicationFiled: December 20, 2016Publication date: April 6, 2017Inventors: Arun Gupta, William C. McDonald, Adam Fruehling, Ivan Kmecko, Lance Barron, Divyanshu Agrawal, Arthur M. Turner, John C. Ehmke
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Patent number: 9573801Abstract: A MEMs actuator device and method of forming includes arrays of actuator elements. Each actuator element has a moveable top plate and a bottom plate. The top plate includes a central membrane member and a cantilever spring for movement of the central membrane member. The bottom plate consists of two RF signal lines extending under the central membrane member. A MEMs electrostatic actuator device includes a CMOS wafer, a MEMs wafer, and a ball bond assembly. Interconnections are made from a ball bond to an associated through-silicon-via (TSV) that extends through the MEMS wafer. A RF signal path includes a ball bond electrically connected through a TSV and to a horizontal feed bar and from the first horizontal feed bar vertically into each column of the array. A metal bond ring extends between the CMOS wafer and the MEMS wafer. An RF grounding loop is completed from a ground shield overlying the array to the metal bond ring, a TSV and to a ball bond.Type: GrantFiled: February 15, 2016Date of Patent: February 21, 2017Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Arun Gupta, William C. McDonald, Adam Fruehling, Ivan Kmecko, Lance Barron, Divyanshu Agrawal
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Patent number: 9448484Abstract: A method of forming a micro-electromechanical systems (MEMS) pixel, such as a DMD-type pixel, by depositing a photoresist spacer layer upon a substrate. The photoresist spacer layer is exposed to a grey-scale lithographic mask to shape an upper surface of the photoresist spacer layer. A control member is formed upon the shaped spacer layer, and has a sloped portion configured to maximize energy density. An image member is configured to be positioned as a function of the control member to form a spatial light modulator (SLM).Type: GrantFiled: November 3, 2014Date of Patent: September 20, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Patrick I. Oden, James C. Baker, Sandra Zheng, William C. McDonald, Lance W. Barron
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Publication number: 20160266377Abstract: In described examples, a DMD includes an array of micromirror pixels. Each pixel includes a right electrode on a first side of the pixel, a left electrode on a second side of the pixel adjacent the first side, and a cantilevered beam supporting a mirror. The cantilever beam tilts on two axes of translation: pitch and roll. The mirror has: a first landed position (on a first and second spring tip) over the right electrode; and a second landed position (on the first and a third spring tip) over the left electrode, such that the first landed position and the second landed positions are 90° apart. In transitioning from the first landed position to the second landed position, the mirror maintains contact with the first spring tip while rolling from the second spring tip to the third spring tip.Type: ApplicationFiled: May 20, 2016Publication date: September 15, 2016Inventors: William C. McDonald, James N. Hall, Mark F. Reed, Lance W. Barron, Terry A. Bartlett, Divyanshu Agrawal
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Publication number: 20160176701Abstract: A MEMs actuator device and method of forming includes arrays of actuator elements. Each actuator element has a moveable top plate and a bottom plate. The top plate includes a central membrane member and a cantilever spring for movement of the central membrane member. The bottom plate consists of two RF signal lines extending under the central membrane member. A MEMs electrostatic actuator device includes a CMOS wafer, a MEMs wafer, and a ball bond assembly. Interconnections are made from a ball bond to an associated through-silicon-via (TSV) that extends through the MEMS wafer. A RF signal path includes a ball bond electrically connected through a TSV and to a horizontal feed bar and from the first horizontal feed bar vertically into each column of the array. A metal bond ring extends between the CMOS wafer and the MEMS wafer. An RF grounding loop is completed from a ground shield overlying the array to the metal bond ring, a TSV and to a ball bond.Type: ApplicationFiled: February 15, 2016Publication date: June 23, 2016Inventors: Arun Gupta, William C. McDonald, Adam Fruehling, Ivan Kmecko, Lance Barron, Divyanshu Agrawal, Arthur M. Turner, John C. Ehmke, James C. Baker
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Patent number: 9348136Abstract: A DMD having an array of micromirror pixels wherein each pixel comprises a right electrode on a first side of the pixel, a left electrode on a second side of the pixel adjacent the first side and a cantilevered beam supporting a mirror. The cantilever beam tilts on two axes of translation: pitch and roll. The mirror has a first landed position (on a first and second spring tip) over the right electrode and a second landed position (on the first and a third spring tip) over the left electrode such that the first landed position and the second landed positions are 90° apart. In transitioning from the first landed position to the second landed position, the mirror maintains contact with the first spring tip while rolling from the second spring tip to the third spring tip.Type: GrantFiled: May 13, 2014Date of Patent: May 24, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: William C. McDonald, James N. Hall, Mark F. Reed, Lance W. Barron, Terry A. Bartlett, Divyanshu Agrawal
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Publication number: 20160124311Abstract: A method of forming a micro-electromechanical systems (MEMS) pixel, such as a DMD-type pixel, by depositing a photoresist spacer layer upon a substrate. The photoresist spacer layer is exposed to a grey-scale lithographic mask to shape an upper surface of the photoresist spacer layer. A control member is formed upon the shaped spacer layer, and has a sloped portion configured to maximize energy density. An image member is configured to be positioned as a function of the control member to form a spatial light modulator (SLM).Type: ApplicationFiled: November 3, 2014Publication date: May 5, 2016Inventors: Patrick I. Oden, James C. Baker, Sandra Zheng, William C. McDonald, Lance W. Barron
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Publication number: 20160124302Abstract: A method of forming a micro-electromechanical systems (MEMS) pixel, such as a DMD type pixel, by forming a substrate having a non-planar upper surface, and depositing a photoresist spacer layer upon the substrate. The spacer layer is exposed to a grey-scale lithographic mask to shape an upper surface of the spacer layer. A control member is formed upon the planarized spacer layer, and an image member is formed over the control member. The image member is configured to be positioned as a function of the control member to form a spatial light modulator (SLM). The spacer layer is planarized by masking a selected portion of the spacer layer with a grey-scale lithographic mask to remove binge in the selected portion.Type: ApplicationFiled: November 3, 2014Publication date: May 5, 2016Inventors: Patrick I. Oden, James C. Baker, Sandra Zheng, William C. McDonald, Lance W. Barron
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Patent number: 9040854Abstract: A MEMS electrostatic actuator includes a bottom plate affixed to a substrate and a top plate suspended above the bottom plate. The top plate has a parallel plate center section and two rotating members electrically connected to the center section. Each rotating member is attached centrally of the rotating member for rotation about an axis of rotation to a set of anchor posts. The attachment includes at least one pair of torsional springs attached along each axis, each spring comprising a rectangular metal square that twists as the rotational members rotate. Electrostatic pull-down electrodes are underneath each rotational member.Type: GrantFiled: September 13, 2012Date of Patent: May 26, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Arun K. Gupta, William C. McDonald
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Publication number: 20150070749Abstract: A DMD having an array of micromirror pixels wherein each pixel comprises a right electrode on a first side of the pixel, a left electrode on a second side of the pixel adjacent the first side and a cantilevered beam supporting a mirror. The cantilever beam tilts on two axes of translation: pitch and roll. The mirror has a first landed position (on a first and second spring tip) over the right electrode and a second landed position (on the first and a third spring tip) over the left electrode such that the first landed position and the second landed positions are 90° apart. In transitioning from the first landed position to the second landed position, the mirror maintains contact with the first spring tip while rolling from the second spring tip to the third spring tip.Type: ApplicationFiled: May 13, 2014Publication date: March 12, 2015Inventors: William C. McDonald, James N. Hall, Mark F. Reed, Lance W. Barron, Terry A. Bartlett, Divyanshu Agrawal
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Publication number: 20140076697Abstract: A MEMS electrostatic actuator includes a bottom plate affixed to a substrate and a top plate suspended above the bottom plate. The top plate has a parallel plate center section and two rotating members electrically connected to the center section. Each rotating member is attached centrally of the rotating member for rotation about an axis of rotation to a set of anchor posts. The attachment includes at least one pair of torsional springs attached along each axis, each spring comprising a rectangular metal square that twists as the rotational members rotate. Electrostatic pull-down electrodes are underneath each rotational member.Type: ApplicationFiled: September 13, 2012Publication date: March 20, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Arun K. Gupta, William C. McDonald