Liquid crystal displays with row-selective transmittance compensation and methods of operation thereof
First Claim
1. A liquid crystal display (LCD), comprising:
- a plurality of thin-film-transistor (TFT) LCD elements arranged in a plurality of rows, a respective one of said TFT LCD elements including a liquid crystal element having a pixel electrode and a common electrode, a storage capacitor having a first electrode and a second electrode connected to said pixel electrode, and a transistor having a controlled electrode connected to said pixel electrode and a gate electrode which controls current through said controlled electrode;
common electrode driving means, connected to said common electrodes of said liquid crystal elements of said plurality of TFT LCD elements, for applying a common electrode voltage to said common electrodes of said liquid crystal elements of said plurality of TFT LCD elements;
gate driving means, electrically connected to the gate electrodes of said plurality of TFT LCD elements, for applying a respective gate driving voltage to the gate electrodes of a respective row of said TFT LCD elements and to the first electrodes of the storage capacitors of another row of TFT LCD elements other than a first row of TFT LCD elements; and
first row storage capacitor driving means, responsive to said common electrode driving means and electrically connected to the first electrodes of the storage capacitors of said first row of TFT LCD elements, for applying a periodic driving voltage to said first electrodes of said storage capacitors of said first row of TFT LCD elements responsive to said common electrode voltage, such that said first row of LCD elements operate according to a predetermined transmittance characteristic.
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Abstract
A liquid crystal display (LCD) includes a plurality of thin-film-transistor (TFT) LCD elements arranged in a plurality of rows, a respective one of the TFT LCD elements including a liquid crystal element having a pixel electrode and a common electrode, a storage capacitor having a first electrode and a second electrode connected to the pixel electrode, and a transistor having a controlled electrode connected to the pixel electrode and a gate electrode which controls current through the controlled electrode. A common electrode voltage is applied to the common electrodes of the liquid crystal elements of the plurality of TFT LCD elements. A respective gate driving voltage is applied to the gate electrodes of a respective row of the TFT LCD elements and to the first electrodes of the storage capacitors of another row of TFT LCD elements other than a first row of TFT LCD elements. A periodic driving voltage is applied to the first electrodes of the storage capacitors of the first row of TFT LCD elements, the periodic driving voltage having a magnitude and a DC bias sufficient to operate the first row of LCD elements according to a first predetermined transmittance characteristic. Related circuits and methods are also discussed.
87 Citations
22 Claims
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1. A liquid crystal display (LCD), comprising:
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a plurality of thin-film-transistor (TFT) LCD elements arranged in a plurality of rows, a respective one of said TFT LCD elements including a liquid crystal element having a pixel electrode and a common electrode, a storage capacitor having a first electrode and a second electrode connected to said pixel electrode, and a transistor having a controlled electrode connected to said pixel electrode and a gate electrode which controls current through said controlled electrode; common electrode driving means, connected to said common electrodes of said liquid crystal elements of said plurality of TFT LCD elements, for applying a common electrode voltage to said common electrodes of said liquid crystal elements of said plurality of TFT LCD elements; gate driving means, electrically connected to the gate electrodes of said plurality of TFT LCD elements, for applying a respective gate driving voltage to the gate electrodes of a respective row of said TFT LCD elements and to the first electrodes of the storage capacitors of another row of TFT LCD elements other than a first row of TFT LCD elements; and first row storage capacitor driving means, responsive to said common electrode driving means and electrically connected to the first electrodes of the storage capacitors of said first row of TFT LCD elements, for applying a periodic driving voltage to said first electrodes of said storage capacitors of said first row of TFT LCD elements responsive to said common electrode voltage, such that said first row of LCD elements operate according to a predetermined transmittance characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a liquid crystal display (LCD) including a plurality of thin-film-transistor (TFT) LCD elements arranged in a plurality of rows, a respective one of the TFT LCD elements including a liquid crystal element having a pixel electrode and a common electrode, a storage capacitor having a first electrode and a second electrode connected to the pixel electrode, and a transistor having a controlled electrode connected to the pixel electrode and a gate electrode which controls current through the controlled electrode, the method comprising the steps of:
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applying a common electrode voltage to the common electrodes of the liquid crystal elements of the plurality of TFT LCD elements; applying a respective gate driving voltage to the gate electrodes of a respective row of the TFT LCD elements and to the first electrodes of the storage capacitors of another row of TFT LCD elements other than a first row of TFT LCD elements; and applying a periodic driving voltage to the first electrodes of the storage capacitors of the first row of TFT LCD elements responsive to the common electrode voltage, such that the first row of LCD elements operates according to a first predetermined transmittance characteristic. - View Dependent Claims (17, 18, 19)
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20. A method of operating a liquid crystal display (LCD) including a plurality of thin-film-transistor (TFT) LCD elements arranged in a plurality of rows, a respective one of the TFT LCD elements including a liquid crystal element having a pixel electrode and a common electrode, a storage capacitor having a first electrode and a second electrode connected to the pixel electrode, and a transistor having a controlled electrode connected to the pixel electrode and a gate electrode which controls current through the controlled electrode, the storage capacitors of a respective row of a plurality of rows of TFT LCD elements being connected by a respective gate line of a plurality of gate lines, the storage capacitors of a first row of TFT LCD elements other that the plurality of rows being commonly connected by a dummy gate line, the method comprising the steps of:
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applying a respective one of a plurality of gate driving voltages to a respective one of the gate lines to operate the plurality of rows of TFT LCD elements according to a first predetermined transmittance characteristic; and applying a periodic driving voltage to the dummy gate line of the row of TFT LCD elements, the periodic driving voltage having a magnitude and a DC bias to compensate for a differing impedance characteristic of the dummy gate line with respect to the plurality of gate lines and thereby operate the first row of LCD elements according to a second transmittance characteristic which approximates the first predetermined transmittance characteristic. - View Dependent Claims (21, 22)
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Specification