LCD device with improved optical performance
First Claim
1. A method to reduce a drop in a voltage potential in a liquid crystal display having a plurality of gate lines for providing gate line signals and a plurality of data lines for providing data signals, the liquid crystal display having a plurality of pixels arranged in a plurality of pixel rows, each pixel having a first electrode, a second electrode, and a liquid crystal layer segment disposed between the first and second electrodes, the first electrode electrically connected to a first voltage and the second electrode electrically connected to a data line through a switching element for receiving a data signal during a gate line signal so as to achieve the voltage potential across the liquid crystal layer segment, the pixel further comprising a charge storage capacitor having a first capacitor end and a second capacitor end, the first capacitor end of the charge storage capacitor electrically connected to the second electrode, said method comprising the steps of:
- applying a second voltage to the second capacitor end of the charge storage capacitor during the gate line signal; and
applying a third voltage to the second capacitor end of the charge storage capacitor after the gate line signal has passed, wherein the third voltage in at least some of the plurality of pixels is greater than the second voltage.
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Abstract
In an LCD pixel, the pixel voltage is usually reduced after a gate line signal has passed. To compensate for this voltage reduction, the voltage applied to the charge storage capacitor in the pixel is increased from Vcom to Vcom1 after the gate line signal has passed. Voltage adjustment can be achieved by using two switching elements connected to the second end of the charge storage capacitor. One is activated by the gate line signal so that the applied voltage is equal to Vcom, and the other is activated by the next gate line signal so that the applied is increased to Vcom1. In a transflective LCD panel or a color LCD panel, each pixel is divided into two or three sub-pixels, each sub-pixel having a separate charge storage capacitor, a similar Vcom change is applied to each of the charge storage capacitors in the pixel.
84 Citations
20 Claims
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1. A method to reduce a drop in a voltage potential in a liquid crystal display having a plurality of gate lines for providing gate line signals and a plurality of data lines for providing data signals, the liquid crystal display having a plurality of pixels arranged in a plurality of pixel rows, each pixel having
a first electrode, a second electrode, and a liquid crystal layer segment disposed between the first and second electrodes, the first electrode electrically connected to a first voltage and the second electrode electrically connected to a data line through a switching element for receiving a data signal during a gate line signal so as to achieve the voltage potential across the liquid crystal layer segment, the pixel further comprising a charge storage capacitor having a first capacitor end and a second capacitor end, the first capacitor end of the charge storage capacitor electrically connected to the second electrode, said method comprising the steps of: -
applying a second voltage to the second capacitor end of the charge storage capacitor during the gate line signal; and
applying a third voltage to the second capacitor end of the charge storage capacitor after the gate line signal has passed, wherein the third voltage in at least some of the plurality of pixels is greater than the second voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A liquid crystal display having a plurality of pixels arranged in a plurality of pixel rows, a plurality of gate lines for providing gate line signals and a plurality of data lines for providing data signals to the plurality of pixels, each pixel having
a switching element; -
a first electrode, a second electrode, a liquid crystal layer segment disposed between the first and second electrodes, the first electrode electrically connected to a first voltage and the second electrode electrically connected to a data line through the switching element for receiving a data signal during a gate line signal, and a charge storage capacitor having a first capacitor end and a second capacitor end, the first capacitor end electrically connected to the second electrode, said liquid crystal display comprising;
a voltage source connected to the second capacitor end of the charge storage capacitor so as to apply the first voltage to the charge storage capacitor during the gate line signal and to apply a second voltage to the charge storage capacitor after the gate line signal has passed, wherein the second voltage in at least some of the plurality of pixels is greater than the second voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification