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    Light emitting diode with field enhanced contact
    1.
    发明授权
    Light emitting diode with field enhanced contact 有权

    公开(公告)号：US10326052B1

    公开(公告)日：2019-06-18

    申请号：US15894831

    申请日：2018-02-12

    Applicant: Facebook Technologies, LLC

    Inventor： Christopher Percival

    IPC: H01L33/00 ,  H01L33/24 ,  H01L33/42 ,  H01L33/06 ,  H01L33/32

    Abstract: Embodiments relate to a light emitting structure including a light emitting diode, a first contact, and a second contact. The light emitting diode includes a body of transparent semiconductor material with a top surface and a light emitting region below the top surface. The light emitting region emits light in response to current passing through the light emitting region; the emitted light passes through the body of the light emitting diode. The first contact is connected to the top surface of the body and has a spiral shape to induce an electromagnetic field. The electromagnetic field shapes the light emitted from the light emitting region and passes through the body of the light emitting diode. The second contact is connected to a surface of the light emitting structure. A voltage difference can be applied across the first contact and second contact to generate the current through the light emitting region.

    Probe card for efficient screening of highly-scaled monolithic semiconductor devices
    2.
    发明授权
    Probe card for efficient screening of highly-scaled monolithic semiconductor devices 有权

    公开(公告)号：US11579182B1

    公开(公告)日：2023-02-14

    申请号：US16788213

    申请日：2020-02-11

    Applicant: Facebook Technologies, LLC

    Inventor： Daniel Brodoceanu ,  Christopher Percival ,  Zheng Sung Chio ,  Chao Kai Tung

    IPC: G01R31/27 ,  G01R1/073 ,  G01R31/26 ,  H01L33/36 ,  H01L21/66 ,  H01L33/58 ,  F21V8/00 ,  H01L33/46

    Abstract: Enhanced probe cards, for testing unpackaged semiconductor die including numerous discrete devices (e.g., LEDs), are described. The die includes anodes and cathodes for the LEDs. Via a single touchdown event, the probe card may simultaneously operate each of the LEDs. The LEDs' optical output is measured and the performance of the die is characterized. The probe card includes a conductive first contact and another contact that are fabricated from a conformal sheet or film. Upon the touchdown event, the first contact makes contact with each of the die's anodes and the other contact makes contact with each of the die's cathodes. The vertical and sheet resistance of the contacts are sufficient such that the voltage drop across the vertical dimension of the contacts is approximately an order of magnitude greater than the operating voltage of the LEDs and current-sharing between adjacent LEDs is limited by the sheet resistance.

    Vortex linearization of micro-LED polarization
    3.
    发明授权
    Vortex linearization of micro-LED polarization 有权

    公开(公告)号：US10712579B1

    公开(公告)日：2020-07-14

    申请号：US16134785

    申请日：2018-09-18

    Applicant: Facebook Technologies, LLC

    Inventor： Christopher Percival ,  Yijing Fu

    IPC: G02B27/28 ,  H01L25/075 ,  H01L33/24 ,  H01L33/58 ,  H01L33/10

    Abstract: A vortex polarizer converts light having azimuthal polarization emitted at a light emitting surface of a light emitting diode (LED) into a converted light having linear polarization. The vortex polarizer includes a distribution of fast axes that vary as a function of azimuth angle. Each fast axis rotates a portion of the light having the azimuthal polarization to a portion of the converted light having linear polarization. The vortex polarizer may include linear photoalignment polymer (LPP) aligned to define the distribution of fast axes.

    REDUNDANCY IN INORGANIC LIGHT EMITTING DIODE DISPLAYS
    4.
    发明申请
    REDUNDANCY IN INORGANIC LIGHT EMITTING DIODE DISPLAYS 审中-公开

    公开(公告)号：US20190043917A1

    公开(公告)日：2019-02-07

    申请号：US16158237

    申请日：2018-10-11

    Applicant: Facebook Technologies, LLC

    Inventor： Patrick Joseph Hughes ,  Vincent Brennan ,  Joseph O'Keeffe ,  Christopher Percival ,  William Padraic Henry ,  Tilman Zehender

    IPC: H01L27/15 ,  H01L27/12 ,  H01L25/16 ,  H01L33/48 ,  H01L33/00 ,  H01L21/66 ,  H01L25/075

    Abstract: Methods and apparatus for use in the manufacture of a display device including pixels. Each pixel includes a plurality of sub-pixels, each sub-pixel configured to provide light of a given wavelength. The method may include: performing, using a pick up tool (PUT), a first placement cycle comprising picking up first light emitting diode (LED) dies, and placing a first LED die on a substrate of the display device at a location corresponding to a sub-pixel the display device. The method further includes performing one or more subsequent placement cycles comprising picking up a second LED die, and placing the second LED die on the substrate of the display device at a second location corresponding to the sub-pixel of the display device. Multiple first and second LED dies may be picked and placed during each placement cycle to populate each pixel of the display device to provide redundancy of LED dies at each sub-pixel.

    Redundancy in inorganic light emitting diode displays
    7.
    发明授权
    Redundancy in inorganic light emitting diode displays 有权

    公开(公告)号：US10720468B2

    公开(公告)日：2020-07-21

    申请号：US16158237

    申请日：2018-10-11

    Applicant: Facebook Technologies, LLC

    Inventor： Patrick Joseph Hughes ,  Vincent Brennan ,  Joseph O'Keeffe ,  Christopher Percival ,  William Padraic Henry ,  Tilman Zehender

    IPC: H01L27/15 ,  H01L33/00 ,  H01L21/66 ,  H01L25/16 ,  H01L27/12 ,  H01L33/48 ,  H01L25/075

    Abstract: Methods and apparatus for use in the manufacture of a display device including pixels. Each pixel includes a plurality of sub-pixels, each sub-pixel configured to provide light of a given wavelength. The method may include: performing, using a pick up tool (PUT), a first placement cycle comprising picking up first light emitting diode (LED) dies, and placing a first LED die on a substrate of the display device at a location corresponding to a sub-pixel the display device. The method further includes performing one or more subsequent placement cycles comprising picking up a second LED die, and placing the second LED die on the substrate of the display device at a second location corresponding to the sub-pixel of the display device. Multiple first and second LED dies may be picked and placed during each placement cycle to populate each pixel of the display device to provide redundancy of LED dies at each sub-pixel.

    Display panel with non-visible light detection
    10.
    发明授权
    Display panel with non-visible light detection 有权

    公开(公告)号：US10319266B1

    公开(公告)日：2019-06-11

    申请号：US15495910

    申请日：2017-04-24

    Applicant: Facebook Technologies, LLC

    Inventor： Christopher Percival ,  Robin Sharma

    IPC: G09G3/32 ,  G09F9/33 ,  G02B27/01 ,  H01L25/16

    Abstract: A display panel for concurrent video output and eye position tracking. The display panel includes a substrate, a plurality of visible light emitting diodes (LEDs) positioned on a side of the substrate, and a plurality of light detectors positioned on the side of the substrate. The visible LEDs transmit quasi-collimated visible light propagating away from the side of the substrate. The light detectors capture invisible light propagating toward the side of the substrate, reflected from an eye of the user. In some embodiments, non-visible LEDs are formed on the side of the substrate. The visible LEDs, light detectors, and non-visible LEDs may be arranged to form pixels of the display panel. The quasi-collimated light emitted from the visible LEDs reduces spread into beam paths of the invisible light between the non-visible LEDs and the light detectors.

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