Panasonic Corporation

Panasonic Electric Works Co., Ltd.

Hiroyuki Hirose

Hideharu Kawachi

Masanao Okawa

Shin Ukegawa

Katunobu Hamamoto

Tadasi Nisimura

Yoshinori Tsuzuki

Kei Mituyasu

Yosikazu Kado

Hirosi Murayama

A display deviceincludes light emitting sectionsof different luminous colors disposed between anode and cathode electrodes, current control unitsfor controlling currents supplied to the light emitting sectionsto desired current levels, respectively, and an emergency power supply for supplying a current to the current control unitsin an emergency in which a commercial power source does not perform a desired function. When operated by the emergency power supply, the current control units turn on and off the light emitting sectionsof different luminous colors such that they are turned on during different periods of time. When the emergency power supply is used, the display devicecontrols turning on of the planar light emitting element using an organic EL light emitting element depending on luminous colors thereof, thereby suppressing the power consumption of the emergency power supply.

Display device and guide lamp including same

In order to suppress cost of an initial investment by a user and running cost to the user to a low extent while substantially constantly maintaining an apparent illuminance, and further, to realize resource saving, in a case of using a fluorescent lamp FHFas a discharge lamp La, a lamp supply power is started to be supplied from a value lower than 45 W as rated electric power at an initial period of an operation of the discharge lamp, a light adjustment signal is changed in response to an accumulated lighting time so that the lamp supply power can be a value higher than 45 W as the rated electric power on and after a rated lifetime of the discharge lamp La, whereby the lamp supply power (output of an inverter circuit) is adjusted. In the fluorescent lamp FHF, a light/electric power ratio becomes substantially constant when the lamp supply power is 41 W to 55 W, and accordingly, a light quantity is increased without impairing light emission efficiency of the discharge lamp La, and as a result, the apparent illuminance can be maintained substantially constantly.

Discharge lamp lighting device and light fixture

Growing community of inventors

Nishinomiya, Japan

Hiroyuki Hirose