Active matrix type display apparatus
First Claim
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1. An active-matrix type display apparatus comprising:
- a matrix display panel including a substrate having a major surface, a plurality of pixel electrodes arranged on said substrate in rows and columns, a plurality of signal lines formed on the major surface of said substrate and extending among the columns of said pixel electrodes, a plurality of gate lines formed on the major surface of said substrate, crossing said signal lines and extending among the rows of said pixel electrodes, a plurality of switching elements each connected between a corresponding one of said pixel electrodes and a corresponding one of said signal lines and controlled by a corresponding one of said gate lines, a common electrode opposite to said pixel electrodes and held at a constant potential, and liquid crystal filled between said substrate and said common electrode;
gate-line drive means for applying a gate-drive voltage to each of said gate lines;
power-supply means for generating a first power-supply potential and a second power-supply potential lower than the first power-supply potential, each of the first and second power-supply potentials having respective high and low levels, with the first and second power-supply potentials synchronously varying between their respective high and low levels at predetermined intervals while maintaining a predetermined potential difference therebetween; and
signal-line drive means applied by the first power-supply potential and the second power-supply potential to be operated, for applying a signal voltage which is inverted in polarity at the predetermined intervals to each of said signal lines.
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Abstract
An active-matrix type liquid-crystal display comprising a matrix display panel including a glass substrate, pixel electrodes formed on the substrate, signal lines formed on the substrate, gate lines formed on the substrate, and switching elements formed on the substrate, signal-line drive ICs for applying signal voltages to the signal lines, and gate-line drive ICs for driving the switching elements. The display further comprises power-supply potential control circuits for changing the first and second power-supply potentials (VDD, VSS) of the signal-line drive ICs, each by a predetermined value, in accordance with the signal voltages to be applied to the pixel electrodes.
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Citations
15 Claims
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1. An active-matrix type display apparatus comprising:
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a matrix display panel including a substrate having a major surface, a plurality of pixel electrodes arranged on said substrate in rows and columns, a plurality of signal lines formed on the major surface of said substrate and extending among the columns of said pixel electrodes, a plurality of gate lines formed on the major surface of said substrate, crossing said signal lines and extending among the rows of said pixel electrodes, a plurality of switching elements each connected between a corresponding one of said pixel electrodes and a corresponding one of said signal lines and controlled by a corresponding one of said gate lines, a common electrode opposite to said pixel electrodes and held at a constant potential, and liquid crystal filled between said substrate and said common electrode; gate-line drive means for applying a gate-drive voltage to each of said gate lines; power-supply means for generating a first power-supply potential and a second power-supply potential lower than the first power-supply potential, each of the first and second power-supply potentials having respective high and low levels, with the first and second power-supply potentials synchronously varying between their respective high and low levels at predetermined intervals while maintaining a predetermined potential difference therebetween; and signal-line drive means applied by the first power-supply potential and the second power-supply potential to be operated, for applying a signal voltage which is inverted in polarity at the predetermined intervals to each of said signal lines. - View Dependent Claims (2, 3, 4, 5)
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6. An active-matrix type display apparatus comprising:
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a matrix display panel including a substrate having a major surface, a plurality of pixel electrodes arranged on said substrate in rows and columns, a plurality of signal lines having odd-numbered signal lines and even-numbered signal lines which are formed on the major surface of said substrate and extend among the columns of said pixel electrodes, a plurality of gate lines formed on the major surface of said substrate, crossing said signal lines and extending among the rows of said pixel electrodes, a plurality of switching elements each connected between a corresponding one of said pixel electrodes and a corresponding one of said signal lines and controlled by a corresponding one of said gate lines, a common electrode opposite to said pixel electrodes and held at a constant potential, and liquid crystal filled between said substrate and said common electrode; a gate-line drive circuit for applying a gate-drive voltage to each of said gate lines; a first power-supply circuit for generating a first power-supply potential and a second power-supply potential lower than the first power-supply potential, each of the first and second power-supply potentials having respective high and low levels, with the first and second power-supply potentials synchronously varying between their respective first and second levels at predetermined intervals while keeping predetermined levels and maintaining a predetermined potential difference therebetween; a second power-supply circuit for generating a third power-supply potential and a fourth power-supply potential lower than the third power-supply potential, each of the third and fourth power-supply potentials having respective high and low levels, with the third and fourth power-supply potentials synchronously varying between their respective high and low levels at predetermined intervals while keeping predetermined levels and maintaining a predetermined potential difference therebetween, the third and fourth power-supply potentials being inverted in polarity to the first and second power-supply potentials, respectively; a first signal-line drive circuit connected to said first power-supply circuit and driven by the first power-supply potential and the second power-supply potential, for applying a signal voltage which is inverted in polarity at the predetermined intervals to each of the odd-numbered signal lines; and a second signal-line drive circuit connected to said first power-supply circuit and driven by the third and fourth power-supply potentials, for applying a signal voltage which is inverted in polarity at the predetermined intervals to even-numbered signal lines. - View Dependent Claims (7, 8, 9, 10)
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11. An active-matrix type display apparatus comprising:
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a matrix display panel including a substrate having a major surface, a plurality of pixel electrodes arranged on said substrate in rows and columns, a plurality of signal lines formed on the major surface of said substrate and extending among the columns of said pixel electrodes, a plurality of gate lines formed on the major surface of said substrate, crossing said signal lines and extending among the rows of said pixel electrodes, a plurality of switching elements each connected between a corresponding one of said pixel electrodes and a corresponding one of said signal lines and controlled by a corresponding one of said gate lines, a common electrode opposite to said pixel electrodes, and liquid crystal filled between said substrate and said common electrode; a plurality of gate-line drive circuits each applying a gate-drive voltage to each of respective ones of said gate lines; a plurality of power-supply circuits each generating a first power-supply potential and a second power-supply potential lower than the first power-supply potential, each of the first and second power-supply potentials having respective high and low levels, with the first and second power-supply potentials synchronously varying between their respective high and low levels at predetermined intervals while maintaining a predetermined potential difference therebetween; and a plurality of signal-line drive ICs each supplied and operated by the first power-supply potential and the second power-supply potential, for applying a signal voltage which is inverted in polarity at the predetermined intervals to each of said signal lines. - View Dependent Claims (12, 13, 14, 15)
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Specification