Illumination – Display backlight – Lcd backlight
Reexamination Certificate
2006-02-14
2008-10-28
O'Shea, Sandra (Department: 2875)
Illumination
Display backlight
Lcd backlight
C362S241000, C362S245000, C362S623000
Reexamination Certificate
active
07441916
ABSTRACT:
A reflecting plate in form of dual half-ellipses comprises a first ellipse having a first focal point and a second focal point, and a second ellipse having a first focal point and a second focal point. The first ellipse and the second ellipse commonly share the first focal point. A cross-section of the reflecting plate is designed in such a form that the dual half-ellipses are aligned with each other, and that contours of the first ellipse and the second ellipse are divided by a straight line, which includes the commonly shared first focal point and the other focal points. The reflecting plate encloses the line light source by the dual half-ellipses and reflects a light from the line light source toward the diffusion plate arranged above by specular reflection and by diffused reflection. As a result, uneven brightness is eliminated at the boundary of the reflecting plate designed in form of dual half-ellipses.
REFERENCES:
patent: 5479328 (1995-12-01), Lee et al.
patent: 6793361 (2004-09-01), Matsui
patent: 7163315 (2007-01-01), Chang et al.
patent: 2005-024746 (2005-01-01), None
Masuyama Koichi
Sone Naoya
Tsumura Makoto
Yamada Yuichiro
Antonelli, Terry Stout & Kraus, LLP.
Cranson James W
Future Vision Inc.
O'Shea Sandra
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