公开(公告)号：US20170207365A1

公开(公告)日：2017-07-20

申请号：US15001951

申请日：2016-01-20

Applicant: Google Inc.

Inventor： Michael Grundmann ,  Martin F. Schubert

IPC: H01L33/14 ,  H01L33/00 ,  H01L33/42 ,  H01L33/06 ,  H01L33/32

CPC classification number: H01L33/145 ,  H01L33/007 ,  H01L33/0079 ,  H01L33/06 ,  H01L33/32 ,  H01L33/42

Abstract: An apparatus includes a p-type semiconductor material, an n-type semiconductor material, and an active region disposed between the p-type semiconductor material and the n-type semiconductor material. The active region emits light in response to a voltage applied across the active region, and the active region includes a quantum well region, a barrier region, and a capping region. The barrier region is disposed to confine charge carriers in the quantum well region. The capping region is disposed between the quantum well region and the barrier region, and the capping region is adjacent to the quantum well region to stabilize a material composition of the quantum well region. The quantum well region, the barrier region, and the capping region collectively form a first tri-layer structure.

公开(公告)号：US10732340B2

公开(公告)日：2020-08-04

申请号：US15656589

申请日：2017-07-21

Applicant: GOOGLE INC.

Inventor： Martin Friedrich Schubert ,  Michael Grundmann

IPC: F21V8/00 ,  G02B27/01

Abstract: Techniques of providing illumination to a head-mounted display (HMD) involve providing off-board illumination apart from the HMD. An off-board illumination unit delivers the illumination to the HMD via optical fibers. The optical fibers are lightweight and do not restrict motion of a user. Because the power source is less restricted, the off-board illumination unit provides flexibility in the hardware used to generate the illumination. For example, the illumination unit may use red, green, and blue narrow-band diode lasers. Further, by controlling modes in the fiber and providing additional light-guiding hardware, the angles at which light strikes LCD pixels may be largely restricted to certain specified angles. Restricted angles of incidence enable the use of fast-switching liquid crystals without degrading the image quality. Such a restriction allows for high-resolution imaging using rapid switching of the liquid crystal which enables very low latencies.

公开(公告)号：US20170213934A1

公开(公告)日：2017-07-27

申请号：US15005872

申请日：2016-01-25

Applicant: Google Inc.

Inventor： Michael Grundmann ,  Martin F. Schubert

IPC: H01L33/00 ,  H01L33/30 ,  H01L27/15 ,  H01L33/42 ,  H01L33/24

CPC classification number: H01L33/0025 ,  H01L27/156 ,  H01L33/0062 ,  H01L33/24 ,  H01L33/30 ,  H01L33/42 ,  H01L2933/0016

Abstract: A light emitting diode (LED) includes a semiconductor material with an active region. The active region is disposed in the semiconductor material to produce light in response to a voltage applied across the semiconductor material. The active region includes a wide bandgap region disposed to inhibit charge transfer from a central region of the LED to the lateral edges of the LED. The active region also includes a narrow bandgap region disposed in the central region with the wide bandgap region disposed about the narrow bandgap region, and the narrow bandgap region has a narrower bandgap than the wide bandgap region.