Matsushita Electric Industrial Co., Ltd.

Masayuki Yahagi

Masahiro Ohara

Masaru Kuwahara

A dispersion electroluminescent device and a switch unit using the same are disclosed. The dispersion electroluminescent device includes three electrodes: first and second electrode layers and a common electrode layer. The common electrode layer is disposed between the first and second electrode layers. An electroluminescent layer and a first dielectric layer are disposed between the first electrode layer and the common electrode layer. A second dielectric layer is disposed between the common electrode layer and the second electrode layer. A voltage source applies first and second ac or dc pulse voltages, which are 180.degree. out of phase with each other, across the first electrode layer and the common electrode layer and across the common electrode layer and the second electrode layer, respectively, for canceling mechanical vibrations produced at the first and second dielectric layers by each other.

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Osaka, Japan

Masayuki Yahagi