公开(公告)号：US20250147317A1

公开(公告)日：2025-05-08

申请号：US18949951

申请日：2024-11-15

Applicant: GOOGLE LLC

Inventor： Oleg Yaroshchuk ,  Ravi Kumar Komanduri ,  Shreyas Potnis ,  Michael Anthony Klug ,  Christopher Charles Townsend ,  Zheng Qin ,  Xinda Hu ,  Scott Fullam

IPC: G02B27/01 ,  G02B27/28 ,  H04N9/31

Abstract: A time-division multiplexed projection display is pixel shifted to produce an increased perceived display resolution or to mitigate image defects, such as defects in a display, a waveguide, or a prism, in an augmented, mixed, or virtual reality device. A polarizing beam splitter (PBS) divides input unpolarized display light into two orthogonal linear polarizations and directs them to two PBS arms. The PBS arms act to shift the light in synchronization with the time-multiplexed display such that a single pixel of the light engine providing the display light is converted into two or four virtual pixels, effectively increasing the perceived display resolution relative to the native resolution of the light engine. The PBS combines the light from both PBS arms into a single, unpolarized output that may then be projected into a lens or a waveguide incoupler to enable the light to propagate through a waveguide for display.

公开(公告)号：US20240242381A1

公开(公告)日：2024-07-18

申请号：US18412931

申请日：2024-01-15

Applicant: GOOGLE LLC

Inventor： Zhiheng Jia ,  Chao Guo ,  Scott Fullam ,  Jeffrey Neil Margolis

IPC: G06T7/80 ,  G02B27/01 ,  G06F3/01

CPC classification number: G06T7/80 ,  G02B27/0172 ,  G02B27/0176 ,  G06F3/013

Abstract: Techniques include performing a calibration of the display with respect to the eye-tracking camera after usage. The calibration involves determining a current position of a reflected pixel of the display within a field of view of the eye-tracking camera and comparing that position with a calibration position, for example a position seen at the factory. The pixel may then be shifted according to the difference between the current position and the calibration position.