Sharp Kabushiki Kaisha Corporation

Futoshi Satoh

Norio Yasunishi

A digital video signal transmission apparatus is provided with (a) a digital video signal conversion circuit for converting each chrominance signal of an input digital video signal in such a manner that every plural frames (1) in one frame of the plural frames each chrominance signal is converted into a signal having plural bits, (2) in the other frames of the plural frames, each chrominance signal is converted into a signal having 1 bit, so that an average of gradation levels of the respective chrominance signals in plural frames after the conversion is substantially equal to gradation levels of the respective chrominance signals in a single frame before conversion, (b) a flag signal generation circuit for generating a flag signal for setting the respective chrominance signals in each pixel signal, so that one of the chrominance signal has plural bits, while the other chrominance signal has one bit, (c) a converted data combination circuit for assigning each signal to each of the chrominance signal in accordance with the flag signal, and (d) a bit expansion circuit for carrying out bit expansion of the digital video signal in accordance with the flag signal, so that each chrominance signal has an identical number of bits in each pixel signal. This provides an image display apparatus that can reduce a data amount of the digital video signal which is transmitted via a data transmission path.

Digital video signal transmission apparatus and image display apparatus

A method for driving a liquid crystal display device including a plurality of row electrodes intersecting a plurality of column electrodes, a scanning voltage applied to each of the row electrodes, and a signal voltage applied to each of the column electrodes, the method comprising the steps of: a) determining, for each of the column electrodes, correction data for correcting the signal voltage based on an increment or a decrement of an effective voltage value between each of row electrodes and each of the column electrodes; and b) applying a correction voltage for correcting the signal voltage to each of the column electrodes in accordance with the correction data. An increment or decrement of the effective voltage value may be due to i) at least either a blunt waveform or induced distortion of the signal voltage or ii) at least either a blunt waveform or induced distortion of the scanning voltage, or iii) both.

Liquid crystal display device and method for driving the same

A control circuit for use in a display device capable of displaying gray scale including a plurality of column electrodes and a plurality of row electrodes intersecting each other and pixels provided around the intersections thereof, includes a display data converting section for receiving input display data, dividing the input display data into binary display data and gray scale display data in such a manner as to enable pulse width modulation one frame in a plurality of frames, and outputting the binary display data and the gray scale display data: a pulse controlling section for determining the timing of applying a voltage to each of the plurality of column electrodes for the gray scale display data; and a column electrode driving section for applying a voltage corresponding to the gray scale display data to at least one said column electrode based on the timing of applying a voltage determined by the pulse controlling section.

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Oita, Japan

Futoshi Satoh