Matsushita Electric Industrial Co., Ltd.

Toshiyasu Oue

Mariko Kawaguri

Naohide Wakita

Hiroyuki Yamakita

Seiji Nishiyama

Hirofumi Kubota

Yasuhiko Yamanaka

Taketoshi Nakao

A thin display device is provided which is capable of displaying images at a lowered driving voltage in a shortened response time by causing fine particles to travel in a gaseous phase. The display device includes: a display section having upper substrateand lower substrateeach having a thickness ranging from about 0.1 mm to about 0.5 mm, which are disposed opposite to each other; colored particleshaving a particle diameter ranging from about 1 &#x3bc;m to about 10 &#x3bc;m packed in an air layerprovided in the gap between the upper substrateand the lower substrate; and first electrodeand second electrodeformed on the underside of the upper substrate. The colored particlesused in the display device are electrostatically charged either negatively or positively and are caused to travel between the first electrodeand the second electrodein accordance with voltage applied to the first and second electrodesand

Display device and method of preparing particles for use in image display of a display device

A lower substrate including a first electrode and an upper substrate including a second electrode are opposed to each other. Partitioned spaces between the two substrates correspond to pixels, each including negatively charged black particles and positively charged white particles. In the lower substrate, a piezoelectric material is sandwiched between a third electrode and the first electrode, thereby forming a vibration-generating portion. In a display operation, a signal voltage corresponding to an image signal is applied between the first and second electrodes, and thus, the black particles and the white particles travel between the electrodes and adhere to the respective electrode surfaces to perform the display operation. Before rewriting the display, a sine wave voltage is applied between the first electrode and the third electrode to cause the vibration-generating portion to generate vibration. Aggregated particles are dissociated, and particles adhering to the electrode are detached, by the vibration.

Display device and method of manufacturing same

A reflective plate comprises a substrate, a plurality of protrusions each formed on the substrate and having a curved surface, and a reflective film formed on the substrate having the protrusions, wherein a planar shape of each of the protrusions is indefinite, and when a frame line of the planar shape of each of the protrusions is divided into fine line segments, the line segments are pointed in all directions or in predetermined directions. This improves reflective properties such as dispersion properties.

Reflective plate and display device using the plate

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Nara, Japan

Toshiyasu Oue