INVERTER CIRCUIT, FLUORESCENT TUBE LIGHTING APPARATUS, BACKLIGHT APPARATUS, AND LIQUID CRYSTAL DISPLAY
First Claim
1. A backlight apparatus, comprising:
- a plurality of long-tubular-type fluorescent tubes disposed, such that the longitudinal directions thereof are parallel to one another; and
an inverter transformer, wherein the inverter transformer applies voltages having opposite phases to the ends of each of the fluorescent tubes for driving the plurality of fluorescent tubes simultaneously, and wherein a transformer having a single primary winding and a plurality of secondary windings is used as the inverter transformer.
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Accused Products
Abstract
A driving apparatus and a driving method are disclosed that are capable of uniformly lighting each entire fluorescent tube irrespective of the length or number of fluorescent tubes when simultaneously driving a plurality of fluorescent tubes in a fluorescent tube lighting apparatus. When two inverter circuits having respective transformers are provided at both ends of a fluorescent tube to light the fluorescent tube by push-pull driving, feedback windings of transformers not used in self-excited oscillation of each inverter circuit are connected together, with the transformer connection that connects together the feedback windings being either in-phase or in opposite phase, and the method of connection for fluorescent tubes connecting to secondary windings of each transformer can be changed in accordance with that connection method.
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Citations
11 Claims
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1. A backlight apparatus, comprising:
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a plurality of long-tubular-type fluorescent tubes disposed, such that the longitudinal directions thereof are parallel to one another; and
an inverter transformer, wherein the inverter transformer applies voltages having opposite phases to the ends of each of the fluorescent tubes for driving the plurality of fluorescent tubes simultaneously, and wherein a transformer having a single primary winding and a plurality of secondary windings is used as the inverter transformer. - View Dependent Claims (2, 5, 6, 7)
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3. The backlight apparatus, comprising:
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a plurality of long-tubular-type fluorescent tubes disposed, such that the longitudinal directions thereof are parallel to one another; and
a plurality of secondary windings each for increasing a voltage inputted to a primary winding and outputting the increased voltage, wherein the voltage increased by one of the secondary windings is applied to one-end side of the fluorescent tubes, and the voltage increased by the other secondary winding is applied to the other-end side of the fluorescent tubes, so as to drive the plurality of fluorescent tubes, and wherein the number of windings of an inverter transformer which supplies the voltage to one-end side of the plurality of fluorescent tubes, is the same as the number of windings of an inverter transformer which supplies the voltage to the other-end side of the plurality of fluorescent tubes. - View Dependent Claims (4)
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8. A backlight apparatus, comprising:
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a plurality of fluorescent tubes disposed, such that the longitudinal directions thereof are substantially parallel to one another; and
an inverter circuit, wherein the inverter circuit applies voltages having opposite phases to the ends of each of the fluorescent tubes for driving the plurality of fluorescent tubes simultaneously, and wherein the inverter circuit is provided with a transformer having a single primary winding and a plurality of secondary windings.
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9. A drive apparatus, comprising:
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an inverter transformer having a primary winding and a plurality of secondary windings for increasing a voltage inputted to the primary winding, the apparatus driving a plurality of fluorescent tubes disposed, such that the longitudinal directions thereof are substantially parallel to one another, wherein, when the plurality of fluorescent tubes are driven, the voltage increased by one of the secondary windings is applied to one-end of the fluorescent tubes, and the voltage increased by the other secondary winding is applied to the other-end of the fluorescent tubes, and wherein the number of windings of an inverter transformer which supplies the voltage to one-end side of the plurality of fluorescent tubes, is the same as the number of windings of an inverter transformer which supplies the voltage to the other-end side of the plurality of fluorescent tubes. - View Dependent Claims (10)
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11. An inverter circuit, comprising:
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an inverter transformer having a primary winding and a plurality of secondary windings for increasing a voltage inputted to the primary winding, the apparatus driving a plurality of fluorescent tubes disposed, such that the longitudinal directions thereof are substantially parallel to one another, wherein, when the inverter circuit is used for driving the plurality of fluorescent tubes, the voltage increased by one of the secondary windings is applied to one-end of the fluorescent tubes, and the voltage increased by the other secondary winding is applied to the other-end of the fluorescent tubes, and wherein the number of windings of an inverter transformer which supplies the voltage to one-end side of the plurality of fluorescent tubes, is the same as the number of windings of an inverter transformer which supplies the voltage to the other-end side of the plurality of fluorescent tubes.
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Specification