ATBECHDEDKESFRGBGRITLILUNLSEMCPTIE......FI....CY..TRBGCZEE......................JDIM350 (Ver 2.1 Jan 2001) 1991010/0 1999001/01450473CORRECTED EUROPEAN PATENT APPLICATIONpublished in accordance with Art. 158(3) EPCA8A120041020W154DEBibliographieENBibliographyFRBibliographieEP02804347.92002111520030723JaEnEn200136634020011130JP2004102020044320040825200435200410202004437 7H 02M 3/07 Ade"STROMERZEUGUNGSSCHALTUNG, ANZEIGEVORRICHTUNG UND ZELLULARE ENDGERÄTEVORRICHTUNG"enPOWER GENERATION CIRCUIT, DISPLAY APPARATUS, AND CELLULAR TERMINAL APPARATUSfrCIRCUIT DE GENERATION DE COURANT, AFFICHEUR ET TERMINAL CELLULAIRE4Sony Corporation0021402854600 Mü/rs7-35, Kitashinagawa 6-chome, Shinagawa-kuTokyo 141-0001JPToyozawa, NoboruSONY CORPORATION, 7-35 Kitashinagawa 6-chomeShinagawa-ku, Tokyo 141-0001JPNakajima, YoshiharuSONY CORPORATION, 7-35 Kitashinagawa 6-chomeShinagawa-ku, Tokyo 141-0001JPMüller, Frithjof E., Dipl.-Ing.00008662Müller Hoffmann & Partner Patentanwälte Innere Wiener Strasse 1781667 MünchenDEATBEBGCHCYCZDEDKEEESFIFRGBGRIEITLILUMCNLPTSETRJP200201196620021115JaWO200304926420030612200324

A power supply generating circuit, a display apparatus incorporating the same, and a portable terminal device using the display apparatus as an output display unit are provided. In a DC-DC converter having a charge pump circuit (31), a voltage dividing circuit (32), and a regulation circuit (33), p-channel MOS transistors (Qp21, Qp22, Qp31) are turned on/off based on an enable pulse enb to make the voltage dividing circuit (32) and a comparator (41) active only for a period of regulation time and inactive otherwise. This can cause a current to flow in voltage-divider resistors (R1, R2) and the comparator (41) only for a certain period of time required for the regulation operation, thus reducing the power consumption loss caused by a constant current flow in the voltage-divider resistors (R1, R2) and the comparator (41).