Asahi Glass Company, Limited

Goro Asari

Takeshi Kuwata

Temkar N Ruckmongathan

Yutaka Nakagawa

Masami Ito

Takanori Ohnishi

Toru Ohbiki

A method of forming column signals for driving a liquid crystal display apparatus having a plurality of row electrodes and a plurality of column electrodes wherein a plurality of the row electrodes are selected as a batch; the column electrodes are applied with voltages based on orthogonal transformation signals which are obtained by transforming picture signals corresponding to the positions of the simultaneously selected row electrodes on a panel by an orthogonal function, and the row electrodes are applied with the voltages based on the orthogonal transformation signals; the formation of column signals from the picture signals corresponding to the positions of the simultaneously selected row electrodes on the panel includes a serial-parallel transforming step of transforming inputted picture signals into those having a predetermined bit length, a writing/reading step of reading the picture signals having a predetermined bit length after the picture signals have once been written in a memory; and an operating step of transforming by the orthogonal function the picture signals readout from the memory into the orthogonal transformation signals, wherein a random access mode is used for writing the picture signals in the writing/reading step, and data on the row electrodes corresponding to the same column electrodes are stored in an L number of adjoining addresses with respect to an L number of simultaneously selected row electrodes.

Method for forming column signals for a liquid crystal display apparatus

A display apparatus in which the light transmittance of a pixel selected by a scanning electrode and a data electrode is changed in correspondence with a difference of voltages applied to the scanning electrode and the data electrode has a display panel having a plurality of scanning electrodes and a plurality of data electrodes, a signified video signal forming device for forming signified video signals by distributing digital video signals in a picture to subpictures having the same number as bits each having a bit significance; an orthogonal function generator for generating orthogonal function signals having substantial orthogonality; an orthogonal transformation signal generator for receiving the signified video signals and the orthogonal function signals to operate and output data signals; a scanning voltage generator for receiving scanning signals to apply scanning voltages to the scanning electrodes of the display panel; and a data voltage generator for receiving data signals to apply data voltages to the data electrodes of the display panel, wherein the scanning voltage generator and the data voltage generator are such ones that the peak value of a driving voltage, in each of the subpictures, applied to the display panel as a voltage difference between the scanning voltage and the data voltage corresponds to a significance value of a bit of the digital video signals.

Display apparatus and a driving method for a display apparatus

A display apparatus wherein the light transmittance of a pixel selected by a scanning electrode and a data electrode is changed in response to the difference of voltages applied to the scanning electrode and the data electrode, which comprises a display panel having a plurality of scanning electrodes and a plurality of data electrodes, a scanning voltage generator for applying a scanning voltage to the scanning electrodes of the display panel by receiving a scanning signal, a data voltage generator for applying a data voltage to the data electrodes of the display panel by receiving a data signal, an orthogonal function generator for generating an orthogonal function signal having substantially orthogonality, and a data signal forming circuit for operating the data signal based on a predetermined video signal and the orthogonal function signal generated from the orthogonal function generator, wherein the data signal forming circuit includes a field video signal converter for distributing signals for a single picture to those for a plurality of sub-pictures, and an orthogonal conversion signal generator for effecting orthogonal conversion of an input signal by the orthogonal function signal generated from the orthogonal function generator, the field video signal converter and the orthogonal conversion signal generator being connected in series, and a correction signal generator for generating a correction signal to be included in the data signal so that an effective voltage applied to a pixel in a non-selection time is substantially constant to any pixel.

Growing community of inventors

Yokohama, Japan

Goro Asari