Patent US5037196A successfully refreshed from Google Patents.
US5037196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection-type color display apparatus
Assignee: Sharp Corp
•
Filing: 1988-10-21
•
Granted: 1991-08-06
•
Expires: 2008-10-21
Abstract
Abstract A projection-type color display apparatus has an optical system which includes a light source. There is at least one projection lens and an optical cell, for example, an LCD, that forms a monochromatic display image. A screen is used onto which an enlarged color display image is projected. Also included is a color filter which has picture elements of two or more colors and the color filter is located separately from the electro-optical cell.
Inventors
- 👤 Yutaka Takafuji
- 👤 Youichi Kondoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:25
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/005; G03B21/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A projection color display apparatus comprising: an optical system including a light source and at least one projection lens; an electro-optical cell for forming a monochromatic display image; a color filter having picture elements of two or more colors, said color filter located separately from said electro-optical cell with said at least one projection lens located between said color filter and the electro-optical cell; and a screen onto which an enlarged color display image can be projected; wherein said color filter is located on the screen.
Claim 2
Dependent Claim
86 words
A projection color display apparatus comprising: an optical system including a light source and at least one projection lens; an electro-optical cell for forming a monochromatic display image; a color filter having picture elements of two or more colors, said color filter located separately from said electro-optical cell with said at least one projection lens located between said color filter and the electro-optical cell; and a screen onto which an enlarged color display image can be projected; wherein said color filter is located on the screen.
Claim 3
Dependent Claim
23 words
The projection apparatus according to claim 1, wherein there is a reflecting mirror between said at least one projection lens and a screen.
Claim 4
Dependent Claim
98 words
A projection-type color display apparatus comprising: an optical system containing a light source and at least one projection lens; an electro-optical cell that forms a monochromatic display image; a color filter having picture elements of two or more colors; and a screen onto which an enlarged color display image is projected; wherein said projection lens is disposed between the electro-optical cell and the color filter so that a monochromatic display image formed by the electro-optical cell is enlarged via the projection lens and projected substantially onto the color filter wherein said color filter is located on the screen.
Claim 5
Dependent Claim
98 words
A projection-type color display apparatus comprising: an optical system containing a light source and at least one projection lens; an electro-optical cell that forms a monochromatic display image; a color filter having picture elements of two or more colors; and a screen onto which an enlarged color display image is projected; wherein said projection lens is disposed between the electro-optical cell and the color filter so that a monochromatic display image formed by the electro-optical cell is enlarged via the projection lens and projected substantially onto the color filter wherein said color filter is located on the screen.
Claim 6
Dependent Claim
20 words
The projection apparatus according to claim 3, wherein there is a reflecting mirror between the projection lens and the screen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |