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US 6,295,162 B1Granted
Rear projection screen with optical sheet having irregularities caused by diffusing material smoothed with a transparent control layer
AssigneeDai Nippon Printing Co., Ltd.
InventorHideki Miyata
Life of this patent
Estimating the term…
Abstract
A rear projection screen including a lenticular lens sheet with lenticular lenses for condensing or diffusing light and a transparent smooth layer having a surface roughness of 0 to 40 micrometers placed on the surface of the light-emerging side of the lenticular lens sheet. The rear projection screen can give an image that (1) is free from roughening, (2) has high fidelity gloss reproduction, and (3) has excellent contrast and sharpness.
Claims14
A rear projection screen used for projecting very clear and distinct images comprising
- an optical sheet including a diffusing material and having fine irregularities caused by said diffusing material on a light-emerging-side surface of said optical sheet;
- and
- a transparent coating layer provided on at least an imaging-light-transmitting area in the light-emerging side surface of said optical sheet,
- wherein said transparent coating layer smooths the imaging-light-transmitting area in the light-emerging-side surface of said optical sheet so that a surface roughness Ra of the imaging-light-transmitting area of said optical sheet is 0 to 40 μm.
1 more element
A rear projection screen used for projecting very clear and distinct images comprising
- a plurality of optical sheets, at least the outermost optical sheet of said optical sheets including a diffusing material and having fine irregularities caused by said diffusing material on a light-emerging-side surface of said optical sheet;
- and
- a transparent coating layer provided on at least an imaging-light-transmitting area in the light-emerging-side surface of at least the outermost optical sheet[, said transparent coating layer having a refractive index that is lower than the refractive index of the outermost optical sheet],
- wherein said transparent coating layer smooths the imaging-light-transmitting area of the outermost optical sheet so that a surface roughness Ra of the imaging-light-transmitting area of the outermost optical sheet is from 0 to 0.40 μm.
1 more element
Dependencies are inferred from the claim text.