Driving circuit for liquid crystal pixel array and liquid crystal display using the same
AssigneeHimax Technologies Limited
InventorsWen-Lin Yang, Chih-Lung Kuo
Life of this patent
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Abstract
A driving circuit and a liquid crystal display using the same. In the driving circuit, a first switch and a second switch are provided in a VCOM driver thereof. The first switch is designed to be turned on to a ground a VCOM terminal of a display capacitor, and the second switch is designed to be turned on to couple a constant voltage level DC VCOM to the VCOM terminal of the display capacitor. In addition, a timing controller of the driving circuit is designed for reducing power consumption, which controls the statuses of the first and second switches and determines when to allow a positive polarity voltage to be coupled to the display capacitor to charge the display capacitor for positive polarity display.
Claims10
A driving circuit for a liquid crystal pixel array, comprising:
- a source driver comprising a first source operational amplifier, wherein the first source operational amplifier couples a positive polarity display voltage to a first terminal of a first display capacitor of the liquid crystal pixel array when a first pixel, within the liquid crystal pixel array and providing the first display capacitor, is scanned for positive polarity display and a coupling between the positive polarity display voltage and the first terminal of the first display capacitor is allowed;
- a VCOM driver, comprising:
- a VCOM operational amplifier, outputting a DC VCOM, wherein the VCOM operational amplifier is powered by a power ground and a negative supply voltage;
- a first switch to be turned on to couple a second terminal of the first display capacitor to a ground;
- and
- a second switch, to be turned on to couple the DC VCOM to the second terminal of the first display capacitor;
- and
- a timing controller, determining when to allow the coupling between the positive polarity display voltage and the first terminal of the first display capacitor and controlling statuses of the first and second switches to reduce power consumption of the driving circuit.
Dependencies are inferred from the claim text.