Head mounted display including pancake lens block
US10394040B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2016 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Dec 19, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T19/006
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head mounted display (HMD) includes a display and a pancake lens block. The display with a circular polarizer, comprised of an initial linear polarizer and a first quarter-waveplate with polarizer transmission axis 45° from the waveplate fast axis, emits polarized light. The pancake lens includes a partial reflector, a second quarter-waveplate, and a beam splitting polarizer. The pancake lens receives polarized light from the display. Light propagating through the pancake lens undergoes multiple reflections and transmissions achieved by coordinating changes in polarization of light through these optical elements. To mitigate parasitic light from degrading image quality of the HMD, the fast axis orientation of the first quarter-waveplate is oriented 90° relative to the fast axis orientation of the second quarter-waveplate, and thus the transmission axis of the first polarizer is oriented 90° relative to the transmission axis of the beam splitting polarizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.