Mitsubishi Denki Kabushiki Kaisha

Noritsuna Hashimoto

Hiroshi Okuda

Yasuo Iwasaki

Keiji Fukuyama

Ko Sano

Takao Sawada

Kazu Matsunaga

Kenzo Awazu, Deceased

Chie Nagao

Manabu Akiba

The object of the present invention is to provide a gas discharge display device having improved luminous efficiency by effectively using ultraviolet ray, which is absorbed in a partition wall or a protective film and the like without contributing to excitation of a fluorescent material. By adding gadolinium to the materials excluding the fluorescent material among structures surrounding the discharge cell, ultraviolet ray having a wavelength of 315 nm is generated, which can excite the fluorescent material. The ultraviolet ray excites the fluorescent material to generate visible light, and then, electric-light conversion efficiency is improved.

Material for converting ultraviolet ray and display device using the same

A projection cathode-ray tube includes a multilayered interference film interposed between a face plate and a cathode-ray tube. In order to improve brightness in a direction of the normal, then on a face plate, a phosphor layer is composed of a first layer substantially consisting of large size phosphor particles and a second layer substantially consisting of small size phosphor particles. In addition, a phosphor density of the phosphor layer is set from 20 to 50% larger than that necessary to produce a maximum brightness on a cathode-ray tube without the multilayered interference film. The phosphor particles of the phosphor layer are preferably material having a high reflectance.

Projection cathode-ray tube with interference film

A phosphor excellent in its temperature-versus-luminance characteristics, which is represented by the following formula:

Phosphor

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Tokyo, Japan

Noritsuna Hashimoto