Driving apparatus and method of liquid crystal display apparatus
First Claim
1. A driving apparatus of liquid crystal display apparatus, comprising:
- first and second amplifier circuits that amplify a noninverted input signal or an inverted input signal;
a first changeover circuit that selectively switches and outputs the noninverted and inverted input signals to be outputted to the first and second amplifier circuits;
a second changeover circuit that selectively switches and outputs output signals of the respective first and second amplifier circuits to pixels provided in a matrix manner in accordance with an alternation signal, and a changeover control circuit that controls switching of the first and second changeover circuits so that (a) polarity of an offset voltage to be applied to the pixel by the first and second changeover circuits is changed for every predetermined number of frames and (b) the offset voltage is canceled by frames whose number is twice as many as the predetermined number of frames.
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Abstract
A driving apparatus of liquid crystal display apparatus of the present invention has a changeover control circuit for controlling each switching of the inputs and outputs of first and second amplifier circuits. In the changeover control circuit, an offset voltage applied to a pixel by the first and second amplifier circuits is changed in its polarity for every predetermined number of frames in accordance with a switch changeover signal for operational amplifier and an alternation switch changeover signal input and the offset voltage is canceled by frames whose number is twice as many as the predetermined number of frames. This allows to cancel the offset voltage by the frames and to avoid that the display unevenness is discernible by human eyes, thereby ensuring to provide driving apparatus and driving method of liquid crystal display apparatus that can carry out the display with high quality.
34 Citations
9 Claims
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1. A driving apparatus of liquid crystal display apparatus, comprising:
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first and second amplifier circuits that amplify a noninverted input signal or an inverted input signal;
a first changeover circuit that selectively switches and outputs the noninverted and inverted input signals to be outputted to the first and second amplifier circuits;
a second changeover circuit that selectively switches and outputs output signals of the respective first and second amplifier circuits to pixels provided in a matrix manner in accordance with an alternation signal, and a changeover control circuit that controls switching of the first and second changeover circuits so that (a) polarity of an offset voltage to be applied to the pixel by the first and second changeover circuits is changed for every predetermined number of frames and (b) the offset voltage is canceled by frames whose number is twice as many as the predetermined number of frames. - View Dependent Claims (2, 3)
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4. A driving apparatus of liquid crystal display apparatus, comprising:
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first and second amplifier circuits that amplify a noninverted input signal or an inverted input signal;
a first changeover circuit that selectively switches and outputs the noninverted and inverted input signals to be outputted to the first and second amplifier circuits;
a second changeover circuit that selectively switches and outputs output signals of the respective first and second amplifier circuits to pixels provided in a matrix manner in accordance with an alternation signal, and a changeover control circuit that controls switching of the first and second changeover circuits so that polarity of an offset voltage to be applied to the pixel is changed for every 2m frames and the offset voltage is canceled by 4m frames, where m is a natural number. - View Dependent Claims (5, 6)
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7. A driving method of liquid crystal display apparatus in which (a) noninverted and inverted input signals of first and second amplifier circuits are switched in accordance with a changeover signal and (b) output signals of the first and second amplifier circuits are switched and outputted to pixels provided in a matrix manner in accordance with an alternation signal, comprising the step of:
controlling the changeover signal and the alternation signal (1) so that polarity of each offset voltage to be applied to the pixel is changed for every predetermined number of frames and (2) so that the offset voltage is canceled by frames whose number is twice as many as the predetermined number of frames. - View Dependent Claims (8)
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9. A driving method of liquid crystal display apparatus in which (a) noninverted and inverted input signals of first and second amplifier circuits are switched in accordance with a changeover signal and (b) output signals of the first and second amplifier circuits are switched and outputted to pixels provided in a matrix manner in accordance with an alternation signal, comprising the step of:
controlling the changeover signal and the alternation signal so that polarity of an offset voltage to be applied to the pixel is changed for every 2m frames and the offset voltage is canceled by 4m frames, where m is a natural number.
Specification