Transflective liquid crystal display
First Claim
1. A liquid crystal display device having an array of pixels, the liquid crystal operable in a first state and in a second state, said display device comprising:
- a first substrate having a common electrode;
a second substrate having a plurality of gate lines, a plurality of data lines and a plurality of common lines;
the data lines and the gate lines arranged in different directions, and a liquid crystal layer disposed between the first and second substrates, wherein each of at least some of the pixels is associated with a data line, a first gate line and a second gate line, each said pixel comprising;
a first sub-pixel area and a second sub-pixel area, the first sub-pixel area having a first pixel electrode electrically connected to the data line through a first switching element, the second sub-pixel area having a second pixel electrode electrically connected to the data line through a second switching element, the second pixel electrode further connected to a charge refresh capacitor through a third switching element, wherein when the liquid crystal display is operated in the first state, the first and second switching elements are closed (“
ON”
) and the third switching element is open (“
OFF”
), such that a first voltage potential between the first pixel electrode and the common electrode is substantially equal to a second voltage potential between the second pixel electrode and the common electrode, the second pixel electrode and the refresh capacitor having an electric charge associated therewith, and when the liquid crystal display is operated in the second state, the first and second switching elements are open (“
OFF”
) and the third switching element is closed (“
ON”
) so as to cause a redistribution of the electric charge associated with the second pixel electrode and the refresh capacitor, rendering the first voltage potential being different from the second voltage potential.
1 Assignment
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Accused Products
Abstract
A transflective liquid crystal display having a plurality of pixels, each pixel having a plurality of color sub-pixels, each sub-pixel having a transmission area associated with a first charge storage capacitance and a reflection area associated with a second storage capacitance. In the sub-pixel, a data line, a first gate line, a second gate line and a common line are used to control the operational voltage on the liquid crystal layer associated with the sub-pixel. The first and second gate lines are separately set at a first state and a second state. The ratio of the first charge storage capacitance to the second charge storage capacitance can be controlled according to the states of the gate lines. The second charge storage capacitance is provided by two capacitors connected in parallel through a switching element which can be open or closed according to the states of the gate lines.
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Citations
15 Claims
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1. A liquid crystal display device having an array of pixels, the liquid crystal operable in a first state and in a second state, said display device comprising:
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a first substrate having a common electrode;
a second substrate having a plurality of gate lines, a plurality of data lines and a plurality of common lines;
the data lines and the gate lines arranged in different directions, anda liquid crystal layer disposed between the first and second substrates, wherein each of at least some of the pixels is associated with a data line, a first gate line and a second gate line, each said pixel comprising;
a first sub-pixel area and a second sub-pixel area, the first sub-pixel area having a first pixel electrode electrically connected to the data line through a first switching element, the second sub-pixel area having a second pixel electrode electrically connected to the data line through a second switching element, the second pixel electrode further connected to a charge refresh capacitor through a third switching element, wherein when the liquid crystal display is operated in the first state, the first and second switching elements are closed (“
ON”
) and the third switching element is open (“
OFF”
), such that a first voltage potential between the first pixel electrode and the common electrode is substantially equal to a second voltage potential between the second pixel electrode and the common electrode, the second pixel electrode and the refresh capacitor having an electric charge associated therewith, andwhen the liquid crystal display is operated in the second state, the first and second switching elements are open (“
OFF”
) and the third switching element is closed (“
ON”
) so as to cause a redistribution of the electric charge associated with the second pixel electrode and the refresh capacitor, rendering the first voltage potential being different from the second voltage potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display device having an array of pixels, the liquid crystal operable in a first state and in a second state, said display device comprising:
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a first substrate having a common electrode;
a second substrate having a plurality of gate lines, including a gate-line n and a gate-line n+1, a plurality of data lines including a data line m, and a plurality of common lines;
the data lines and the gate lines arranged in different directions, anda liquid crystal layer disposed between the first and second substrates, wherein one of the pixels is associated with the data line m, the gate line n and the gate line n+1, said pixel comprising;
a first sub-pixel area and a second sub-pixel area, the first sub-pixel area having a first pixel electrode electrically connected to the data line m through a first switching element, the second sub-pixel area having a second pixel electrode electrically connected to the data line m through a second switching element, the second sub-pixel area having a refresh capacitor having a first end and a second end, the second end electrically connected to one of the common lines, the second pixel electrode further connected to the first end of the charge refresh capacitor through a third switching element, each of the first and second switching elements having a control end electrically connected to the gate line n, the third switching element having a control end electrically connected to the gate line n+1, wherein when the liquid crystal display is operated in the first state, the first and second switching elements are closed (“
ON”
) and the third switching element is open (“
OFF”
), such that a first voltage potential between the first pixel electrode and the common electrode is substantially equal to a second voltage potential between the second pixel electrode and the common electrode, the second pixel electrode and the refresh capacitor having an electric charge associated therewith, andwhen the liquid crystal display is operated in the second state, the first and second switching elements are open (“
OFF”
) and the third switching element is closed (“
ON”
) so as to cause a redistribution of the electric charge associated with the second pixel electrode and the refresh capacitor, rendering the first voltage potential being different from the second voltage potential. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for improving viewing quality of a transflective liquid crystal display having a first side, an opposing second side, and a liquid crystal layer disposed between the first and second sides, the display comprising a plurality of pixels, at least some of the pixels including a plurality of color sub-pixels, each sub-pixel comprising a transmission area and a reflection area, wherein the transmission area comprises a transmissive electrode disposed adjacent to the second side, allowing light entering the sub-pixel from the second side to be transmitted through the transmissive electrode, and the liquid crystal layer and then to the first side, and the reflection area comprises a reflective electrode disposed adjacent to the second side spaced from the transmissive electrode, allowing light entering the sub-pixel from the first side through the liquid crystal layer to be reflected by the reflective electrode back through the liquid crystal layer and then to the first side, and wherein the liquid crystal display is operable in a first state and in a second state for controlling optical behavior of the liquid crystal layer for viewing, said method comprising the steps of:
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providing a first charge storage capacitance to the transmission area;
providing a second charge storage capacitance to the reflective area, the second charge capacitance having a relative capacitance value compared to the first charge storage capacitance; and
controlling at least one of the first capacitance and the second capacitance such that the relative capacitance value when the liquid crystal display is operated in the first state is different from the relative capacitance value when the liquid crystal display is operated in the second state.
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Specification