Liquid crystal cells – elements and systems – Particular structure – Lens or prism separate from projection system
Reexamination Certificate
2005-05-24
2005-05-24
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Lens or prism separate from projection system
C349S061000, C349S095000, C359S619000, C359S620000
Reexamination Certificate
active
06897911
ABSTRACT:
The light diffusing plate includes a lens substrate, a plurality of microlenses disposed on a surface of the lens substrate, a plurality of light exit areas, each having a circular or rectangular form a center of which is coincident with an optical axis of the microlens, and a light shield layer formed on another surface of the lens substrate, and covering other area than the light exit areas. When n and t are a refractive index and a thickness of the lens substrate, respectively, and C (R; diameter, A, B; sides of rectangle) is a size of light exit area, a size of the microlens Sr satisfies the following formula in the light diffusing plate: Sr≧2t×tan θ+C (with the proviso that θ=sin−1(1
)). Or, a form of the microlens in the light diffusing plate is a part of an ellipsoid shown in the following formula X2/a2+y2/a2+z2/c2=1 (x and y represent axis on the surface of the lens substrate, z represents the optical axis), it's eccentricity ε is shown in the following formula ε=(c2−a2)1/2/c=1
and it's far focal point is coincident with a position of the light exit area. The liquid crystal display apparatus and the rear projection apparatus use the light diffusing plate.
REFERENCES:
patent: 5369544 (1994-11-01), Mastrangelo
patent: 5946100 (1999-08-01), Ishibara
patent: 6231200 (2001-05-01), Shinohara et al.
patent: 20010019378 (2001-09-01), Yamaguchi
Chowdhury Tarifur R.
Fuji Photo Film Co. , Ltd.
Nguyen Hoan C.
Sughrue & Mion, PLLC
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