Backlight device and liquid crystal display

Details Backlight device and liquid crystal display Backlight device and liquid crystal display

2007-03-06

2007-03-06

Tso, Laura K. (Department: 2875)

Illumination

Illuminated scale or dial

Internal light source

C362S223000, C362S225000

Reexamination Certificate

active

10571719

ABSTRACT:
A light dimming dot pattern is provided for an LCD in which the diameter of dots is changed in a range from approximately 0.16 mm to approximately 0.65 mm depending on the distance of the dots from a fluorescent tube (13) in such a manner that the volume of the shielded light is increased and decreased at a location close to a position overlying the fluorescent tube (13) and at a location remote from the fluorescent tube (13), respectively. In this manner, a light dimming dot pattern with a transmittance for all light rays of approximately 62% (roughly in the vicinity of 62%), higher than the transmittance for all light rays in the conventional technique not higher than 50%, is produced. Consequently, the light of uniform high luminance may be produced without raising the luminance of the fluorescent tube (13), and hence an LCD of high luminance may be realized.

REFERENCES:
patent: 2002/0197051 (2002-12-01), Tamura et al.
patent: 2004/0032725 (2004-02-01), Hsieh et al.
patent: 2005/0275766 (2005-12-01), Liu et al.
patent: 2-36818 (1990-03-01), None
patent: 3-160031 (1991-07-01), None
patent: 6-301034 (1994-10-01), None
patent: 9-236803 (1997-09-01), None
patent: 2003-105229 (2003-04-01), None

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