Liquid crystal display using swing common electrode voltage and a drive method thereof
First Claim
1. A method for driving a liquid crystal display (LCD), comprising steps of:
- turning on a gate electrode for a first predetermined period, wherein a gate voltage does not swing after the first predetermined period for a second predetermined period;
changing a polarity of a pixel voltage from a first polarity to a second polarity during the first predetermined period;
swinging a common electrode voltage after the first predetermined period for the second predetermined period; and
swinging the pixel voltage from said first polarity to said second polarity, and then, from said second polarity to said first polarity during the second predetermined period,wherein the pixel voltage and the common electrode voltage swing in synchronization during the second predetermined period, and a swinging width of the common electrode voltage is different from that of the pixel voltage.
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Accused Products
Abstract
Disclosed is a liquid crystal display using a swing common electrode voltage and a drive method thereof. The liquid crystal display comprises a timing controller, a data driver, a gate driver outputting gate drive voltages and a drive voltage generator for outputting at least two different common electrode voltages that undergo swinging by synchronizing to a predetermined period with respect to the gate drive voltages. In the method, image signals are received from an external image signal source and supplied to the data lines. Scanning signals are supplied sequentially to the gate lines. Pixel voltage variations are checked. A common electrode voltage ending at positive is output during a gate “on” time to the LCD panel, and A common electrode voltage that repeatedly swings from negative to positive is generated during a gate “off” time if the pixel voltage has varied from negative to positive. A common electrode voltage ending at positive is generated during a gate “on” time to the LCD panel. A common electrode voltage that repeatedly swings from positive to negative is generated during a gate “off” time to the LCD panel if the pixel voltage is varied from positive to negative.
32 Citations
19 Claims
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1. A method for driving a liquid crystal display (LCD), comprising steps of:
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turning on a gate electrode for a first predetermined period, wherein a gate voltage does not swing after the first predetermined period for a second predetermined period; changing a polarity of a pixel voltage from a first polarity to a second polarity during the first predetermined period; swinging a common electrode voltage after the first predetermined period for the second predetermined period; and swinging the pixel voltage from said first polarity to said second polarity, and then, from said second polarity to said first polarity during the second predetermined period, wherein the pixel voltage and the common electrode voltage swing in synchronization during the second predetermined period, and a swinging width of the common electrode voltage is different from that of the pixel voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device, comprising:
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a timing controller receiving a synchronization signal and a clock signal and generating a data drive signal, a gate drive signal and a common electrode signal; a data driver receiving the data drive signal and generating a data voltage; a gate driver receiving the gate drive signal and generating a gate voltage; a common signal generator receiving the common electrode signal and generating at least two different common electrode voltages; and a plurality of pixels formed in a matrix, each pixel comprising; a pixel electrode; a switching element supplying the data voltage to the pixel electrode in response to the gate voltage; and a common electrode receiving one of the common electrode voltages, wherein the data voltage supplied to the pixel electrode and the common electrode voltage supplied to the common electrode form a liquid crystal capacitance, wherein, in each pixel, a polarity of a pixel voltage changes from a first polarity to a second polarity while the switching element is turned on for a first predetermined period by the gate voltage, the gate voltage does not swing after the first predetermined period for a second predetermined period, the common electrode voltage swings after the first predetermined period for the second predetermined period, the pixel voltage swings from said first polarity to said second polarity, and then, from said second polarity to said first polarity during the second predetermined period, the pixel voltage and the common electrode voltage swing in synchronization during the second predetermined period, and a swinging width of the common electrode voltage is different from that of the pixel voltage. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of driving a liquid crystal display (LCD), comprising steps of:
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providing a gate voltage to a gate electrode to turn on the gate electrode for a first predetermined period, wherein the gate voltage does not swing after the first predetermined period for a second predetermined period; providing a data voltage to a pixel electrode in response to the gate voltage; and providing a common voltage to a common electrode, the common voltage swinging after the first predetermined period for the second predetermined period, wherein a polarity of a pixel voltage changes from a first polarity to a second polarity during the first predetermined period, the pixel voltage swings from said first polarity to said second polarity, and then, from said second polarity to said first polarity during the second predetermined period, the pixel voltage and the common electrode voltage swing in synchronization during the second predetermined period, and a swinging width of the common electrode voltage is different from that of the pixel voltage. - View Dependent Claims (18, 19)
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Specification