公开(公告)号：US20240310566A1

公开(公告)日：2024-09-19

申请号：US18597862

申请日：2024-03-06

Applicant: Apple Inc.

Inventor： Choon How Gan ,  Adam Backer ,  Ben-Li Sheu ,  Francesco Aieta ,  Ping Qu ,  Se Baek Oh ,  Zhenwen Ding

IPC: F21V8/00 ,  G02B27/01

CPC classification number: G02B6/0016 ,  G02B6/0018 ,  G02B6/0036 ,  G02B27/0172

Abstract: An electronic device may have a waveguide, an input coupler that couples light into the waveguide, and an optical coupler that couples the light out of the waveguide. A medium may be layered onto the waveguide. The input coupler may include a first surface relief grating (SRG) and the optical coupler may include a second SRG in the medium. The first SRG may be a non-binary staircase SRG having ridges with multiple steps. The second SRG may be a binary SRG having troughs that extend to the height of the lowest steps of the first SRG. A reflective layer may fill the first SRG. Forming the input coupler using a staircase SRG may serve to maximize the in-coupling efficiency of the input coupler, thereby maximizing the efficiency with which the light is provided to an eye box.

公开(公告)号：US20210391513A1

公开(公告)日：2021-12-16

申请号：US17225796

申请日：2021-04-08

Applicant: Apple Inc.

Inventor： Jaein Choi ,  Joy M. Johnson ,  Lai Wang ,  Ben-Li Sheu ,  Hairong Tang ,  Steven E. Molesa ,  Sunggu Kang ,  Young Cheol Yang

IPC: H01L33/58 ,  H01L51/52

Abstract: To extract light from a light-emitting diode (and thereby improve efficiency of the display), a microlens stack may be formed over the light-emitting diode. The microlens stack may include an array of microlenses that is covered by an additional single microlens. Having stacked microlenses in this way increases lens power without increasing the thickness of the display. The array of microlenses may be formed from an inorganic material whereas the additional single microlens may be formed from an organic material. The additional single microlens may conform to the upper surfaces of the array of microlenses. An additional low-index layer may be interposed between the light-emitting diode and the array of microlenses. A diffusive layer may be formed around the light-emitting diode to capture light emitted from the light-emitting diode sidewalls.

公开(公告)号：US11757074B2

公开(公告)日：2023-09-12

申请号：US17225796

申请日：2021-04-08

Applicant: Apple Inc.

Inventor： Jaein Choi ,  Joy M. Johnson ,  Lai Wang ,  Ben-Li Sheu ,  Hairong Tang ,  Steven E. Molesa ,  Sunggu Kang ,  Young Cheol Yang

IPC: H01L33/58 ,  H10K50/854 ,  H10K50/858 ,  H10K50/86

CPC classification number: H01L33/58 ,  H10K50/854 ,  H10K50/858 ,  H10K50/865 ,  H01L2933/0091

Abstract: To extract light from a light-emitting diode (and thereby improve efficiency of the display), a microlens stack may be formed over the light-emitting diode. The microlens stack may include an array of microlenses that is covered by an additional single microlens. Having stacked microlenses in this way increases lens power without increasing the thickness of the display. The array of microlenses may be formed from an inorganic material whereas the additional single microlens may be formed from an organic material. The additional single microlens may conform to the upper surfaces of the array of microlenses. An additional low-index layer may be interposed between the light-emitting diode and the array of microlenses. A diffusive layer may be formed around the light-emitting diode to capture light emitted from the light-emitting diode sidewalls.