LCD device with improved optical performance
First Claim
1. A liquid crystal display having a pixel area comprising 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 havinga pixel 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 pixel switching element for receiving a data signal during a gate line signal, anda charge storage capacitor having a first capacitor end and a second capacitor end, the first capacitor end electrically connected to the second electrode, wherein the plurality of pixel rows comprise a pixel row and an adjacent pixel row, and the plurality of gate lines comprise a first gate line for providing the gate line signal to the pixel row and a second gate line for providing a next gate line signal to the adjacent pixel row, said liquid crystal display comprising;
a first switching element having a control end connected to the first gate line, a first switching end connected to a voltage source, and a second switching end connected to the second capacitor end of the charge storage capacitor so as to apply a second voltage to the charge storage capacitor only during the gate line signal, anda second switching element having a control end connected to the second gate line, a first switching end connected to a different voltage source, and a second switching end connected to the second capacitor end of the charge storage capacitor so as to apply a third voltage to the charge storage capacitor only during the next gate line signal, wherein the third voltage in at least some of the plurality of pixels is greater than the second voltage, wherein the first switching element and the second switching element are disposed outside the pixel area.
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Accused Products
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.
33 Citations
18 Claims
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1. A liquid crystal display having a pixel area comprising 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 pixel 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 pixel 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, wherein the plurality of pixel rows comprise a pixel row and an adjacent pixel row, and the plurality of gate lines comprise a first gate line for providing the gate line signal to the pixel row and a second gate line for providing a next gate line signal to the adjacent pixel row, said liquid crystal display comprising; a first switching element having a control end connected to the first gate line, a first switching end connected to a voltage source, and a second switching end connected to the second capacitor end of the charge storage capacitor so as to apply a second voltage to the charge storage capacitor only during the gate line signal, and a second switching element having a control end connected to the second gate line, a first switching end connected to a different voltage source, and a second switching end connected to the second capacitor end of the charge storage capacitor so as to apply a third voltage to the charge storage capacitor only during the next gate line signal, wherein the third voltage in at least some of the plurality of pixels is greater than the second voltage, wherein the first switching element and the second switching element are disposed outside the pixel area. - View Dependent Claims (7, 8, 9, 10)
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- 2. The liquid crystal display of claim l, wherein each of the pixel rows has a first side and an opposing second side, and said some of the plurality of pixels are located on the first side and some other of the plurality of pixels are located on the second side.
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11. A liquid crystal display having a pixel area comprising 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 comprising
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 source for receiving 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 first transistor and a second transistor disposed outside the pixel area, each of the first and second transistors having a first switching end, a second switching end and a control end, wherein the second switching end of the first transistor and the second switching end of the second transistor are electrically connected to the second capacitor end of the charge storage capacitor, and wherein the first switching end of the first transistor is connected to the first voltage source and the control end of the first transistor is electrically connected to one of the gate lines to receive the gate line signal so as to apply the first voltage to the charge storage capacitor through the first transistor only during the gate line signal, and wherein the first switching end of the second transistor is connected a second voltage source and the control end of the second transistor is electrically connected to a different one of the gate lines so as to apply a second voltage to the charge storage capacitor via the second transistor only during a subsequent gate line signal, wherein the second voltage in at least some of the plurality of pixels is greater than the first voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification