Apparatus for driving lamps and liquid crystal display having the same
AssigneeSamsung Electronics Co., Ltd.
InventorMoon Shik Kang
Life of this patent
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Abstract
An apparatus for driving lamps and a liquid crystal display having the same, wherein the uniformity of luminance among lamps is improved, includes a main transformer unit for supplying a driving voltage to the lamps, and a balance transformer unit for making a lamp current of each of the lamps uniform. The balance transformer unit has a plurality of coils wound on a single body, and the coils have the same turns ratio and share magnetic flux so that a constant uniform current can flow through each of the coils. Accordingly, a lamp current of each of the lamps connected to the respective coils of the balance transformer unit can be maintained to be constant, and thus, the luminance of the lamp can be maintained uniformly.
Claims22
An apparatus for driving lamps, comprising:
- a main transformer unit for supplying a driving voltage to a plurality of lamps;
- first and second balance transformer units connected to the plurality of lamps, the first and second balance transformer units providing a same uniform lamp current to each of the lamps,
- wherein each of the first and second balance transformer units comprises:
- a plurality of primary coils, secondary coils, and a body,
- wherein at least two primary coils and a secondary coil wound on a single body, and each of the primary coils have
- one end connected to a corresponding lamp in the lamp unit, and the other end connected to ground,
- wherein the secondary coils uniformly maintain lamp currents between first and second balance transformer unit.
An apparatus for driving lamps, comprising:
- a main transformer unit for supplying a driving voltage to a plurality of lamps;
- at least two first balance transformer units connected to the plurality of lamps, the at least two first balance transformer units providing a same uniform lamp current to each of the lamps,
- wherein each of the at least two first balance transformer units comprises:
- a first body, and
- a plurality of coils wound on the first body;
- and
- a second balance transformer unit for uniformly maintaining a current between at least two first balance transformer units, the second balance transformer unit comprises:
- a second body, and
- at least two coils wound on a second body,
- wherein the main transformer unit comprises a first and second main transformer unit, each of which includes a primary coil and a secondary coil, the primary coil of each of the first and second main transformer units connected to an input power source, and the secondary coil of the first and second main transformer unit connected to the plurality of lamps, wherein the secondary coil of the first main transformer unit and the secondary coil of the second main transformer unit disconnect to the same lamp.
A liquid crystal display, comprising:
- a backlight unit for emitting light;
- and
- a liquid crystal display panel for displaying an image by means of the light, wherein the backlight unit comprises:
- a lamp unit including a plurality of lamps;
- a main transformer unit for converting an input AC voltage and applying the converted voltage to the plurality of lamps;
- first and second balance transformer units each having a plurality of first coils wound on a single body so as to make a lamp current of each of the plurality of lamps uniform;
- and
- a second coil wound on the single body,
- wherein each of the of the plurality of first coils connects to each of the plurality of lamps and the second coil of the first balance transformer unit connects to the second coil of the second balance transformer unit.
An apparatus for driving lamps, comprising:
- a main transformer unit for supplying a driving voltage to a plurality of lamps;
- at least two first balance transformer units connected to the plurality of lamps, the at least two first balance transformer units providing a same uniform lamp current to each of the lamps,
- wherein the two first balance transformer units comprises:
- a first body, and
- a plurality of coils wound on the first body;
- and
- a second balance transformer unit for uniformly maintaining a current between at least two first balance transformer units, second balance transformer unit comprising at least two coils wound on a second body,
- wherein the main transformer unit comprises first and second main transformer units each of which includes a primary coil and a secondary coil, the primary coil of each of the first and second main transformer units connected to an input power source, and the secondary coil of the first and second main transformer units connected to the plurality of lamps.
Dependencies are inferred from the claim text.