Data processing circuit, display device, and mobile terminal

A display apparatus characterized by comprising:

• a display section formed of pixels disposed in a matrix on a transparent, insulating substrate;
• a plurality of horizontal driving circuits mounted on the substrate for writing display data into the pixels in the display section;
• and
• a data processing circuit mounted on the substrate for processing a display data signal having a first voltage amplitude input in series and which outputs processed display data to the plurality of horizontal driving circuits,
• wherein the data processing circuit is formed of thin-film transistors, and the data processing circuit comprises:
• first level-conversion means for level-converting the display data signal having the first voltage amplitude to a display data signal having a second voltage amplitude larger than the first voltage amplitude;
• serial-parallel conversion means for converting the display data signal level-converted by the first level-conversion means to parallel display data signals;
• and
• second level-conversion means for level-converting the parallel display data signals to display data signals having a third voltage amplitude smaller than the second voltage amplitude.

A portable terminal characterized by having mounted thereon a display apparatus as a screen display section, the display apparatus comprising:

• a display section formed of pixels disposed in a matrix manner on a transparent, insulating substrate;
• a plurality of horizontal driving circuits mounted on the substrate for writing display data into the pixels in the display section;
• and
• a data processing circuit mounted on the substrate for processing a display data signal having a first voltage amplitude input in series and which outputs processed display data to the plurality of horizontal driving circuits,
• wherein
• the data processing circuit is formed of thin-film transistors, and the data processing circuit comprises:
• first level-conversion means for level-converting the display data signal having the first voltage amplitude to a display data signal having a second voltage amplitude larger than the first voltage amplitude;
• serial-parallel conversion means for converting the display data signal level-converted by the first level-conversion means to parallel display data signals;
• and
• second level-conversion means for level-converting the parallel display data signals to display data signals having a third voltage amplitude smaller than the second voltage amplitude.