Driving apparatus for liquid crystal display

A driving apparatus for a liquid crystal display having a layer of liquid crystal material capable of responding to a voltage applied to row and column electrodes, said apparatus comprising:

• an image data buffer memory for storing and outputting image data corresponding to one frame period in a form of an image data matrix, said image data supplied from an external circuit;
• matrix generating means for outputting a predetermined orthogonal matrix;
• conversion means for converting said image data matrix into a converted data matrix using said orthogonal matrix, and for outputting said converted data matrix;
• a converted data buffer memory for storing and outputting said converted data matrix;
• and
• driving means utilizing said orthogonal matrix as a row signal to be applied to said row electrodes of said liquid crystal display and said converted data matrix as a column signal to be applied to said column electrodes of said liquid crystal display for driving said liquid crystal display by synchronizing said row signal and said column signal with each other;
• wherein said conversion means comprises virtual row forming means for calculating a value necessary to make constant, for all columns, a sum of the squares of data contained in one column of said image data matrix, said image data matrix comprising discrete values corresponding to real numbers ranging from 1 to -1, and for adding said calculated value virtually to a last row of said image data matrix as information for a virtual row;
• and
• arithmetic means for calculating a product of said image data matrix and said orthogonal matrix, said arithmetic means comprising an inverter group to calculate a 2's complement of a k-th data of a column of said image data matrix when a k-th data of a row of said orthogonal matrix is equal to -1;
• wherein said virtual row forming means is operable to calculate information for said virtual row by reference to a predetermined table when all data for one column of said image data are outputted from said image data buffer memory to said arithmetic means;
• and
• wherein said arithmetic means calculates a product of said image data matrix and said orthogonal matrix, and adds to said product of said image data matrix and said orthogonal matrix said information for said virtual row, said product being one real number.

A driving apparatus for a liquid crystal display having a layer of liquid crystal material capable of responding to a voltage applied to row and column electrodes, said apparatus comprising:

• an image data buffer memory for storing and outputting digital image data corresponding to one frame period in the form of an image data matrix, said digital image data supplied from an external circuit;
• matrix generating means for outputting a predetermined orthogonal matrix;
• conversion means for converting said image data matrix into a converted data matrix using said orthogonal matrix, and for outputting said converted data matrix;
• a converted data buffer memory for storing and outputting said converted data matrix;
• and
• driving means utilizing said orthogonal matrix as a row signal to be applied to said row electrodes of said liquid crystal display and said converted data matrix as a column signal to be applied to said column electrodes of said liquid crystal display for driving said liquid crystal display by synchronizing said row signal and said column signal;
• wherein said input image data supplied from said external circuit is interlaced image data;
• wherein each said image data buffer memory and said converted data buffer memory stores data corresponding to one field;
• wherein said conversion means comprises virtual row forming means for calculating a value necessary to make constant, for all columns, a sum of the squares of data contained in one column of said image data matrix, said image data matrix comprises discrete values corresponding to real numbers from 1 to -1, and for adding said calculated value virtually to a last row of said image data matrix as information for a virtual row;
• and
• arithmetic means for calculating a product of said image data matrix and said orthogonal matrix, said arithmetic means comprising an inverter group to calculate a 2's complement of a k-th data of a column of said image data matrix when a k-th data of a row of said orthogonal matrix is equal to -1;
• wherein said virtual row forming means is operable to calculate information for said virtual row by making reference to a predetermined table when all data for one column of said image data are to be outputted from said image data buffer memory to said arithmetic means;
• wherein said arithmetic means calculates a product of said image data matrix and said orthogonal matrix, and adds to said product of said image data matrix and said orthogonal matrix said information for said virtual row, said product being one real number;
• and
• wherein said driving means applies said row signal to a first neighboring two row electrodes of said liquid crystal display during an even-numbered field period, and applies said row signal to a second neighboring two row electrodes, differing by a value corresponding to one row with respect to said first neighboring two row electrodes, during an odd-numbered field period.