Ultra-short throw projector with transmissive liquid crystal display
US11099469B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 2019 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Nov 11, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Devices, systems, and methods are provided for an ultra-short throw projector. The projector may include an illuminator having an ellipsoidal reflector, a light emitting diode (LED) positioned inside of the ellipsoidal reflector, and a Fresnel lens positioned inside of the ellipsoidal reflector. The projector may include a circular transmissive liquid crystal display (LCD) and a three-element plastic projection lens positioned outside of the ellipsoidal reflector, wherein the circular transmissive LCD is positioned between the ellipsoidal reflector and the three-element plastic projection lens, wherein the ellipsoidal reflector reflects light emitted by the LED, wherein the Fresnel lens refracts light emitted by the LED, and wherein the three-element plastic projection lens projects the reflected light and the refracted light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.