First surface fresnel reflector for liquid crystal display

Details First surface fresnel reflector for liquid crystal display First surface fresnel reflector for liquid crystal display

G - Physics

02

F

345/8, 88/0.22,

G02F 1/133 (2006.01) G02F 1/1335 (2006.01) G03B 21/132 (2006.01) G03B 21/32 (2006.01)

Patent

CA 1327468

Abstract of the Disclosure A liquid crystal display assembly (10,18,22) for use with a reflective type overhead projector (28) includes a liquid crystal display (10) and an attached Fresnel reflector portion (18,22) which is off-axis in that the center (26) of the reflector (18,22) is not included in the Fresnel reflector portion (18,22) so that a spurious bright spot coinciding in the projected image with the center (26) of the Fresnel reflector (18,22) is eliminated. The Fresnel reflector (18,22) is also of the first-surface reflectivetype and includes variable width grooves (24) both features of which reduce double imaging usually products by reflectivetype overhead projectors (28).

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