Projection type image display apparatus
US5052783A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1989 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Oct 18, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1335
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a liquid crystal image display apparatus, an image of pixels of a liquid crystal display panel are projected onto a projection surface. The apparatus includes a light source, the liquid crystal display panel, microlens arrays provided respectively at a side of the liquid crystal display panel facing the light source and at another side thereof facing the projection surface, and a condenser lens provided between the light source and the microlens array located at the light source side of the display panel. The microlens arrays include a plurality of microlenses provided in positions corresponding to the plurality of pixels of the liquid crystal display panel, and pitches of the microlenses of the microlens array at the light source side are set to be larger than pitches of the pixels, while the pitches of the microlenses of the microlens array at the projection surface side are set to be smaller than those of the pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.