Liquid crystal display using swing common electrode and a method for driving the same
First Claim
1. A liquid crystal display sequentially applying signal voltages based on display data to target pixels to display picture images at respective frames, comprising:
- swing common electrodes for forming storage capacitors;
wherein voltages applied to said swing common electrodes are terminated with minus (−
) during the period of gate on when the pixel voltages are inverted from minus (−
) to plus (+), while being terminated with plus (+) when the pixel voltages are inverted from plus (+) to minus (−
), and repeatedly swung from minus (−
) to plus (+) after the gates turn off.
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Accused Products
Abstract
A liquid crystal display includes swing common electrodes for storage capacitors to sequentially apply signal voltages based on display data to target pixels to display picture images at respective frames. The voltage applied to the common electrodes is terminated with minus (−) during the period of gate on in case the pixel voltage is inverted from minus (−) to plus (+) while being terminated with plus (+) in case the pixel voltage is inverted from plus (+) to minus (−). The common voltage is repeatedly swung from minus (−) to plus (+) after the gate turns off. In these conditions, the respective common electrode lines for the storage capacitors are periodically swung synchronized with gate pulses to thereby generate overshoot. The response speed of the liquid crystal is enhanced due to the overshoot when the gray scale is altered due to the memory effect of the liquid crystal capacitor.
45 Citations
22 Claims
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1. A liquid crystal display sequentially applying signal voltages based on display data to target pixels to display picture images at respective frames, comprising:
-
swing common electrodes for forming storage capacitors;
wherein voltages applied to said swing common electrodes are terminated with minus (−
) during the period of gate on when the pixel voltages are inverted from minus (−
) to plus (+), while being terminated with plus (+) when the pixel voltages are inverted from plus (+) to minus (−
), and repeatedly swung from minus (−
) to plus (+) after the gates turn off. - View Dependent Claims (2, 5, 10)
-
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3. A liquid crystal display using swing common electrodes, comprising:
-
a timing signal control unit outputting a data driver driving signal and a gate driver driving signal, and also outputting first signals for defining cycle and amplitude of common voltages depending upon vertical synchronization signals, horizontal synchronization signals, and main clock signals applied from the outside;
a data driver outputting data driving voltages for driving polarities of a liquid crystal capacitor based on the data driver driving signal;
a gate driver ouputting gate driving voltages based on the gate driver driving signal;
a driving voltage generation unit making the voltage level of the first signals to go up or down upon receipt of the first signals, and outputting swing common voltages synchronized with the gate driving voltages at a predetermined cycle; and
a liquid crystal display panel having one or more gate lines carrying scanning signals, one or more data lines crossing over the gate lines to carry picture signals, switching elements surrounded by the gate and data lines while being connected thereto, a liquid crystal capacitor transmitting light in proportion to the data driving voltages depending upon the turn on operations of the switching elements, and storage capacitors storing the data driving voltage at the turn on of the switching element, and applying the stored data driving voltage to the liquid crystal capacitor at the turn off of the switching element;
wherein the liquid crystal display panel is driven through a line inversion method such that the line at the present frame has a polarity inverted from the polarity of the line at the previous frame. - View Dependent Claims (4, 6, 7)
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8. A liquid crystal display using swing common electrodes, comprising:
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a timing signal control unit outputting a data driver driving signal and a gate driver driving signal, and also outputting first signals for defining cycle and amplitude of common voltages depending upon vertical synchronization signals, horizontal synchronization signals, and main clock signals applied from the outside;
a data driver outputting data driving voltages for driving polarities of a liquid crystal capacitor based on the data driver driving signals;
a gate driver ouputting gate driving voltages based on the gate driver driving signals;
a driving voltage generation unit making the voltage level of the first signals to go up or down upon receipt of the first signals, and outputting swing common voltages synchronized with the gate driving voltages at a predetermined cycle; and
a liquid crystal display panel comprising one or more gate lines carrying scanning signals, one or more data lines crossing over the gate lines to carry picture signals, switching elements surrounded by the gate and data lines while being connected thereto, a liquid crystal capacitor transmitting light in proportion to the data driving voltages depending upon the turn on operations of the switching elements, and storage capacitors storing the data driving voltage at the turn on of the switching element, and applying the stored data driving voltage to the liquid crystal capacitor at the turn off of the switching element;
wherein the liquid crystal display panel is driven through a dot inversion method such that the dot at the present frame has a polarity inverted from the polarity of the dot at the previous frame. - View Dependent Claims (9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of driving a liquid crystal display, the liquid crystal display comprising a liquid crystal display panel having a gate line carrying scanning signals, a data line crossing over the gate lines to carry picture signals, a switching element 20 surrounded by the gate line and the data line while being connected thereto, a liquid crystal capacitor transmitting light in proportion to data driving voltages depending upon states of the switching elements, and storage capacitors storing the data driving voltage at the turn on of the switching element and applying the stored data driving voltage to the liquid crystal capacitor at the turn off of the switching element, the liquid crystal display being inversion-driven at each frame, the method comprising the steps of:
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(a) checking variations in pixel voltages depending upon gate on and off operations of the switching circuits;
(b) outputting a common voltage terminated with minus (−
) during a period of gate on while outputting a common voltage repeatedly swung from minus (−
) to plus (+) during the period of gate off when the pixel voltage is inverted from minus (−
) to plus (+) and(c) outputting a common voltage terminated with plus (+) during a period of gate on while outputting a common voltage repeatedly swung from plus (+) to minus (−
) during the period of gate off when the pixel voltage is inverted from plus (+) to minus (−
)
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Specification