Power source device for driving liquid crystal
First Claim
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1. A power source device for driving both a liquid crystal device with a DC negative voltage, and an AC driven light source arranged for illuminating said liquid crystal device, the power source device comprising:
- an inverter circuit coupled to said light source for providing AC power to said light source for lighting said light source, said inverter circuit comprising;
a step-up transformer having at least a primary winding, a secondary winding, and a feedback winding; and
an oscillator circuit coupled to said primary winding of said step-up transformer for supplying an AC voltage to said primary winding;
said secondary winding being coupled to said light source for providing an AC voltage to light said light source; and
a negative voltage power source generator comprising;
a rectifier circuit coupled to said secondary winding of said step-up transformer for receiving an AC voltage therefrom, and for generating a negative DC voltage from said received AC voltage; and
means for coupling said negative DC voltage to said liquid crystal device to drive said liquid crystal device;
said rectifier circuit of said negative voltage power source generator comprising diode means for rectifying said AC voltage.
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Abstract
A power source device for driving a liquid crystal device comprises an inverter for powering a back-light discharge lamp and a negative voltage power source generator for driving the liquid crystal device. The negative voltage generator is provided as part of the inverter. A step-up transformer of the inverter is commonly used as part of the negative voltage power source generator.
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Citations
13 Claims
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1. A power source device for driving both a liquid crystal device with a DC negative voltage, and an AC driven light source arranged for illuminating said liquid crystal device, the power source device comprising:
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an inverter circuit coupled to said light source for providing AC power to said light source for lighting said light source, said inverter circuit comprising; a step-up transformer having at least a primary winding, a secondary winding, and a feedback winding; and an oscillator circuit coupled to said primary winding of said step-up transformer for supplying an AC voltage to said primary winding; said secondary winding being coupled to said light source for providing an AC voltage to light said light source; and a negative voltage power source generator comprising; a rectifier circuit coupled to said secondary winding of said step-up transformer for receiving an AC voltage therefrom, and for generating a negative DC voltage from said received AC voltage; and means for coupling said negative DC voltage to said liquid crystal device to drive said liquid crystal device; said rectifier circuit of said negative voltage power source generator comprising diode means for rectifying said AC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power source device for driving both a liquid crystal device with a DC negative voltage, and an AC driven light source arranged for illuminating said liquid crystal device, the power source device comprising:
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an inverter circuit coupled to said light source for providing AC power to said light source for lighting said light source, said inverter circuit comprising; a step-up transformer having at least a primary winding, a secondary winding, a feedback winding and a tertiary winding; and an oscillator circuit coupled to said primary winding of said step-up transformer for supplying an AC voltage to said primary winding; said secondary winding being coupled to said light source for providing an AC voltage to light said light source; and a negative voltage power source generator comprising; a rectifier circuit coupled to said tertiary winding of said step-up transformer for receiving an AC voltage therefrom, and for generating a negative DC voltage from said received AC voltage; and means for coupling said negative DC voltage to said liquid crystal device to drive said liquid crystal device; said rectifier circuit of said negative voltage power source generator comprising diode means for rectifying said AC voltage. - View Dependent Claims (11, 12, 13)
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Specification
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Current AssigneeStanley Electric Company Limited
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Original AssigneeStanley Electric Company Limited
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InventorsOki, Youji, Kawano, Katsunori, Kobayashi, Uruo
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Primary Examiner(s)Miller, Stanley D.
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Assistant Examiner(s)PHAN, TRONG Q
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Application NumberUS06/936,317Time in Patent Office1,016 DaysField of Search350/345, 350/331 R, 350/332, 340/811, 340/702, 340/703US Class Current345/102CPC Class CodesH05B 41/2821 by means of a single-switch...
