Rear projection image display apparatus including light exit surface configured to reduce noise
US6400505B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1998 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Feb 26, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Eliminating occurrence of non-uniform vertical line patterns observable in image display apparatus with its associative projector device having its pixel structure in the horizontal direction. To this end, rear projection image display apparatus includes a screen including a lenticular lens sheet having its light incidence surface on which lenticular lenses (8) are periodically provided and a light exit surface having a substantially flat surface (8) at or near the focal position of each lenticular lens (9) on the light incidence surface. The lenticular lens sheet has a light absorption layer (10) provided in a region different from the focal position. The apparatus also includes a projector device having a periodical pixel structure for projecting an optical image onto the screen, such as liquid crystal display panels or the like. Optionally, one or more micro-lenticular lenses may be provided on the substantially flat surface, which lenses have a periodical structure in the same direction as that of the lenticular lenses on the light incidence surface, wherein the pitch ranges from 0.03 to 0.1 mm where as the lens height measures 0.003 to 0.03 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.