Modulation apparatus and image display apparatus

A modulation apparatus comprising:

• a differential encoding unit configured to encode digital image data to vertical differential digital data;
• and
• a differential signal transmitter unit configured to transmit a serial signal based on the vertical differential digital data,
• wherein
• a differential data array group, which have at least a plurality of pairs of a differential data to transmit the serial signal, comprises difference absolute value data having a plurality of bits to represent an absolute value obtained by converting gray scale level data of red, green and blue to binary number data, sign data having at least one bit to be based on the vertical differential digital data of red, green and blue, and control data having Vsync signal, Hsync signal, and Enable signal, and
• the differential signal transmitter unit, with respect to one pair of the differential data, arranges the plurality of bits corresponding to one pixel to a serial signal in an ascending order or a descending order, and with respect to another adjacent pair of the differential data, arranges the sign data corresponding to one pixel into a former half or a latter half of a time period for arranging the serial signal corresponding to one pixel, and arranges the control data corresponding to one pixel into the latter half or the former half of the time period for arranging to the serial signal corresponding to one pixel.

An image display apparatus comprising:

• a differential encoding unit configured to encode digital image data to vertical differential digital data;
• a differential signal transmitter configured to transmit a serial signal based on the differential digital data;
• at least one pair of differential signal transmission lines used to transmit the serial signal;
• a differential signal receiver configured to receive the serial signal transmitted via the differential signal transmission line and output vertical differential digital data;
• a vertical differential decoding unit configured to decode the vertical differential digital data to digital image data;
• and
• an image display unit configured to be supplied with the digital image data as an input and display an image based on the digital image data,
• wherein
• a differential data array group, which have at least a plurality of pairs of a differential data to transmit the serial signal, comprises difference absolute value data having a plurality of bits to represent an absolute value obtained by converting gray scale level data of red, green and blue to binary number data, sign data having at least one bit to be based on the vertical differential digital data of red, green and blue, and control data having Vsync signal, Hsync signal, and Enable signal, and
• the differential signal receiver, with respect to one pair of the differential data, modulates the gray scale level data corresponding to one pixel to a serial signal in an ascending order or a descending order, and with respect to another pair of the differential data, arranges the sign data corresponding to one pixel into a former half or a latter half of a time period for arranging the serial signal corresponding to one pixel, and arranges the control data corresponding to one pixel into the latter half or the former half of the time period for arranging the serial signal corresponding to one pixel.