The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 1996
Filed:
Mar. 25, 1992
Hideki Kamimaki, Yokohama, JP;
Kiyokazu Nishioka, Odawara, JP;
Tsuguji Tachiuchi, Odawara, JP;
Nobuo Tsuchiya, Fujisawa, JP;
Masahiro Jinushi, Fujisawa, JP;
Hitoshi Sadamitsu, Hiratsuka, JP;
Hiroshi Ito, Hadano, JP;
Takashi Yoshitomi, Fujisawa, JP;
Koichi Isaji, Nagoya, JP;
Takao Ohba, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Video & Information System, Inc., Kanagawa, JP;
Abstract
A data processing apparatus which includes a display unit and a power supply controller for supplying power to the display unit. The display unit has a display screen and a back light controller. The power supply controller comprises a switch, at least one output line for receiving the power from the switch and for supplying therethrough the power to electronic devices, a delay circuit for receiving the power from the switch and when the switch is turned ON to start supply of the power, for outputting the power after passage of a predetermined time from the start of the power supply, and a second output line for supplying the power from the delay circuit to the back light controller therethrough. The display unit has a memory means for storing therein a luminance data on the display screen through the back light controller when the power supply is turned OFF and for determining an output state of the display unit through the back light controller on the basis of the luminance data read out from the memory means when the power supply is turned ON. Further, the data processing apparatus has a means for invalidating output of a display data to be output onto the display screen and a means, after the display data is invalidated, for reducing a frequency of a timing signal or invalidating output of the timing signal for the display unit.