Two-piece LCD projection device with light filter function and projection method thereof
US12140854B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2024 |
| Grant date | Nov 12, 2024 |
| Priority date | — |
| Expiry date | May 17, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed are a two-piece LCD projection device with light filter function and a method thereof. The method comprises: a yellow light passes through the condenser and then irradiates on the rear Fresnel lens to become a first light beam, and then passes through the first polarizer to become a first polarized light; a blue light is filtered by the blue light filter to form a target yellow light, which is condensed and then imaged on the screen by a dichroic mirror; a blue divergent light is converged by an aspheric lens, and then reflected by a mirror to the rear Fresnel lens, and becomes a second polarized light, then it enters a second set of LCD screens, and then it passes through a second front Fresnel lens and irradiates on the dichroic mirror, reflecting a light with blue wavelength, and imaging the reflected light on the screen for alignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.