Backlight unit for a liquid crystal television
First Claim
1. A direct type backlight unit for a liquid crystal television, comprising:
- a plurality of U-shaped Cold Cathode Fluorescent Lamps to illuminate a liquid crystal panel for a liquid crystal television from behind; and
a reflector plate placed behind the U-shaped Cold Cathode Fluorescent Lamps to reflect light from the U-shaped Cold Cathode Fluorescent Lamps, wherein the U-shaped Cold Cathode Fluorescent Lamps are respectively placed symmetrically up and down with respect to a transverse plane, as a plane of symmetry, passing through substantially a center in the vertical direction of a display screen of the liquid crystal panel, and wherein the U-shaped Cold Cathode Fluorescent Lamps are mounted in the backlight unit in a manner that the mounting pitch of the U-shaped Cold Cathode Fluorescent Lamps at a central portion in the vertical direction of the display screen is shorter than the center-to-center distance between parallel tube segments in each U-shaped Cold Cathode Fluorescent Lamp.
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Accused Products
Abstract
Two U-shaped CCFLs (Cold Cathode Fluorescent Lamps) are respectively placed symmetrically up and down with respect to a transverse plane, as a plane of symmetry, passing through a center in the vertical direction of a display screen of a liquid crystal panel. These two U-shaped CCFLs are mounted in a backlight unit in a manner that the mounting pitch of the two U-shaped CCFLs is shorter than the center-to-center distance between parallel tube segments in each U-shaped CCFL. Thereby, the backlight unit for e.g. a 15 inch or larger liquid crystal television can secure practical brightness at a central portion in the vertical direction of the display screen by using two U-shaped CCFLs. This makes it possible for the backlight to reduce the number of CCFLs and the number of accompanying components (e.g. inverter circuits), thereby reducing the cost of the entire backlight unit and improving the work efficiency in assembling the backlight unit.
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Citations
16 Claims
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1. A direct type backlight unit for a liquid crystal television, comprising:
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a plurality of U-shaped Cold Cathode Fluorescent Lamps to illuminate a liquid crystal panel for a liquid crystal television from behind; and
a reflector plate placed behind the U-shaped Cold Cathode Fluorescent Lamps to reflect light from the U-shaped Cold Cathode Fluorescent Lamps, wherein the U-shaped Cold Cathode Fluorescent Lamps are respectively placed symmetrically up and down with respect to a transverse plane, as a plane of symmetry, passing through substantially a center in the vertical direction of a display screen of the liquid crystal panel, and wherein the U-shaped Cold Cathode Fluorescent Lamps are mounted in the backlight unit in a manner that the mounting pitch of the U-shaped Cold Cathode Fluorescent Lamps at a central portion in the vertical direction of the display screen is shorter than the center-to-center distance between parallel tube segments in each U-shaped Cold Cathode Fluorescent Lamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A direct type backlight unit for a liquid crystal television, comprising:
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a plurality of S-shaped Cold Cathode Fluorescent Lamps to illuminate a liquid crystal panel for a liquid crystal television from behind; and
a reflector plate placed behind the S-shaped Cold Cathode Fluorescent Lamps to reflect light from the S-shaped Cold Cathode Fluorescent Lamps, wherein the S-shaped Cold Cathode Fluorescent Lamps are respectively placed symmetrically up and down with respect to a transverse plane, as a plane of symmetry, passing through substantially a center in the vertical direction of a display screen of the liquid crystal panel, and wherein the S-shaped Cold Cathode Fluorescent Lamps are mounted in the backlight unit in a manner that the mounting pitch of the S-shaped Cold Cathode Fluorescent Lamps at a central portion in the vertical direction of the display screen is shorter than the center-to-center distance between adjacent parallel tube segments in each S-shaped Cold Cathode Fluorescent Lamp. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification