Citizen Electronics Co., Ltd.

Citizen Holdings Company, Ltd.

Akio Yoshimura

Sadato Imai

Takakazu Yano

Shinichi Miyashita

Kota Ishii

A light-emitting device includes a substrate including electrodes, a first group including a plurality of blue light-emitting diode elements that are disposed on the substrate and electrically connected to the electrodes, a second group including a plurality of blue light-emitting diode elements that are disposed on the substrate and electrically connected to the electrodes, a fluorescent layer disposed to receive light from the first group of blue light-emitting diode elements, and a phosphorescent layer disposed to receive light from the second group of blue light-emitting diode elements.

Light-emitting device

A light-emitting device () includes a plurality of light-emitting areas (and), and each of the light-emitting areas (and) includes a first light-emitting block () and a second light-emitting block (). Each respective first light-emitting blocks () include a plurality of first light-emitting elements (A, A, or A), which are connected in series, and each respective second light-emitting blocks () include a plurality of second light-emitting elements (B, B, or B), which are connected in series. The number of first light-emitting elements in each respective first light-emitting blocks () is the same with one another of the first light-emitting blocks (), and the number of second light-emitting elements in each respective second light-emitting blocks () is the same with one another of the second light-emitting blocks ().

Growing community of inventors

Fujiyoshida, Japan

Akio Yoshimura