Multiple output DC/DC voltage converters
First Claim
1. A liquid crystal display comprising:
- a liquid crystal display panel which has a plurality of pixels arranged in a matrix type in areas determined by a plurality of gate lines and a plurality of data lines crossing the gate lines.;
a gate driver which applies a gate on voltage to one of the gate lines sequentially thereby scanning the pixels in the liquid crystal display panel by a row;
a source driver which receives a plurality of gray voltages and a video signal and selects the gray voltage corresponding to the video signal and applies the selected gray voltage to the data lines of the liquid crystal display panel;
a gray voltage generator which generates a plurality of the gray voltages from data supply voltage and provides the gray voltages to the source driver; and
a multiple output DC/DC converter which induces a transformer, receives a DC input voltage and generates main supply voltage from a primary coil of the transformer and at least two more auxiliary supply voltages from a secondary coils of the transformer wherein, the main supply voltage is used as the data supply voltage, the auxiliary supply voltages are used as the gate on voltage and a gate off voltage.
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Abstract
The multiple output DC/DC voltage converter is needed to generate voltages used in LCD. The multiple output DC/DC voltage converter generates a main supply voltage and at least two more auxiliary supply voltages. The main supply voltage is used as the data supply voltage which requires a significant amount of the power in the LCD and the auxiliary supply voltages are used as the gate on voltage and the gate off voltage. The data supply voltage is provided to the gray voltage generator and used in generating the gray voltage. The gate on voltage and the gate off voltage are provided to the gate driver. The multiple output DC/DC voltage converter comprises a transformer having a primary coil applied with the input DC voltage and at least two more secondary coils, a switch which repeatedly turns on or off responsive to the switching signal to change the current of the primary coil, a plurality of diodes connected to the each winding of the transformer and rectifying the voltage generated in the each coil and a plurality of capacitors connected to the each diode, charging the rectified voltage and generating constant voltage.
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Citations
9 Claims
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1. A liquid crystal display comprising:
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a liquid crystal display panel which has a plurality of pixels arranged in a matrix type in areas determined by a plurality of gate lines and a plurality of data lines crossing the gate lines.;
a gate driver which applies a gate on voltage to one of the gate lines sequentially thereby scanning the pixels in the liquid crystal display panel by a row;
a source driver which receives a plurality of gray voltages and a video signal and selects the gray voltage corresponding to the video signal and applies the selected gray voltage to the data lines of the liquid crystal display panel;
a gray voltage generator which generates a plurality of the gray voltages from data supply voltage and provides the gray voltages to the source driver; and
a multiple output DC/DC converter which induces a transformer, receives a DC input voltage and generates main supply voltage from a primary coil of the transformer and at least two more auxiliary supply voltages from a secondary coils of the transformer wherein, the main supply voltage is used as the data supply voltage, the auxiliary supply voltages are used as the gate on voltage and a gate off voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification