US 20040192412A1
(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2004/0192412 Al
Ono et al. (43) Pub. Date: Sep. 30,2004
(75) Inventors: Tomoaki Ono, Hitachi (JP); Shinya Yamamoto, Hitachinaka (JP)
Correspondence Address:
TOWNSEND AND TOWNSEND AND CREW,
LLP
TWO EMBARCADERO CENTER
EIGHTH FLOOR
SAN FRANCISCO, CA 94111-3834 (US) (73) Assignee: Hitachi, Ltd., Tokyo (JP)
(21) Appl. No.: 10/306,100
(22) Filed: Nov. 27, 2002
(30) Foreign Application Priority Data
Mar. 14, 2002 (JP) 2002-070413
Publication Classification (51) Int. CI.7 H04B 1/38
An object of the present invention is to reduce power consumption during a wait state to thereby extend battery life in a cellular phone having at least two processors, a processor for telephone functions that processes telephone functions, and a processor for application functions that processes application functions. To achieve this object, a cellular phone of the present invention includes a display part, a processor for telephone functions that processes telephone functions, a processor for application functions that processes applications, and a switching circuit that switches the suppliers of a control signal to the display part, wherein the switching circuit performs switching so that a control signal from the processor for telephone functions is supplied to the display part during a wait state, and a control signal from the processor for application functions is supplied to the display part during application processing.
