公开(公告)号：US11829039B1

公开(公告)日：2023-11-28

申请号：US17412107

申请日：2021-08-25

Applicant: Apple Inc.

Inventor： Ziqian He ,  Xiaokai Li ,  Yuan Chen ,  Zhibing Ge ,  Aaron L. Holsteen

IPC: G02B27/28 ,  G02B27/01 ,  G02F1/135 ,  G02B6/10 ,  G02F1/13357 ,  G02F1/1335 ,  G02F1/133 ,  G09G3/34 ,  G09G3/36

CPC classification number: G02F1/135 ,  G02B6/10 ,  G02B27/0172 ,  G02F1/13312 ,  G02F1/133615 ,  G02F1/133622 ,  G09G3/3413 ,  G09G3/36 ,  G02B2027/0112 ,  G02F2202/10 ,  G09G2320/0242 ,  G09G2330/021 ,  G09G2360/144

Abstract: A display may include illumination optics, a ferroelectric liquid crystal on silicon (fLCOS) panel, and a waveguide. The illumination optics may include a red, green, and blue light sources. The fLCOS panel may produce image light by modulating a series of image frames onto illumination light. Control circuitry may control the illumination optics to produce the illumination light for each image frame in the series of image frames according to a green-heavy illumination sequence that includes first, second, and third time periods. The green light source may be active during each of the first, second, and third time periods. This may allow the green light source to be driven with a lower current density than the other light sources without significantly reducing image quality at an eye box. The lower current density may match the peak efficiency of the green light source, thereby minimizing power consumption by the display.

公开(公告)号：US11796872B1

公开(公告)日：2023-10-24

申请号：US17459718

申请日：2021-08-27

Applicant: Apple Inc.

Inventor： Ziqian He ,  Xiaokai Li ,  Zhibing Ge ,  Kaikai Guo ,  Yuan Chen

IPC: G02F1/135 ,  G02B6/10 ,  G02F1/13363 ,  G02F1/01 ,  G02B27/01 ,  G02F1/139

CPC classification number: G02F1/135 ,  G02B6/10 ,  G02B27/0101 ,  G02F1/0136 ,  G02F1/1396 ,  G02F1/133638 ,  G02F2203/01 ,  G02F2413/01 ,  G02F2413/05 ,  G02F2413/12

Abstract: A display may include illumination optics, a ferroelectric liquid crystal on silicon (fLCOS) panel, and a waveguide. A twisted nematic cell may be optically interposed between the fLCOS panel and the waveguide. A birefringent crystal may be optically interposed between the cell and the waveguide. The cell may have a first state in which the cell transmits the image light with a first polarization and a second state in which the cell transmits the image light with a second polarization. The crystal may transmit the image light within spatially offset beams based on polarization. In another arrangement, a quarter waveplate may be optically interposed between the cell and the waveguide and a geometric phase grating may be optically interposed between the quarter waveplate and the waveguide. Control circuitry may toggle the cell between the first and second states to maximize the effective resolution of images at an eye box.