Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Reexamination Certificate
2008-05-08
2010-12-28
Nelms, David (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
Reexamination Certificate
active
07859614
ABSTRACT:
Disclosed is a liquid crystal display (LCD) device in which low power LEDs with a dual lens structure re configured for application in a backlight device to increase the optical efficiency at low power, thus enhancing the brightness, such LCD device including: a lower cover; PCBs (Printed Circuit Boards) disposed on the lower cover for receiving power from the exterior; a main body mounted on the PCBs; R, G and B LED (Light Emitting Diode) devices disposed on the main body for emitting light; a first lens having a first curvature and mounted on the main body and housing the R, G and B LED devices; a second lens covering the outside of the first lens and having an inner curved surface with a second curvature having a varying radius of curvature, and an outer curved surface with a third curvature, wherein the second curvature of the inner curved surface is gradually increased from an edge portion toward a central portion; and a liquid crystal panel spaced apart from the second lens by a certain interval and to which light is provided.
REFERENCES:
patent: 2005/0045897 (2005-03-01), Chou et al.
patent: 2005/0073849 (2005-04-01), Rhoads et al.
patent: 2006/0034082 (2006-02-01), Park et al.
Bae Jun-Ho
Kim Jae-Jin
Moon Won-Taek
LG Display Co. Ltd.
Morgan & Lewis & Bockius, LLP
Nelms David
Vu Phu
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