Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki Kabushiki

Takeo Saikatsu

Takehiko Sakurai

Yoshinori Anzai

Sadayuki Matsumoto

Hiroyoshi Yamazaki

Ko Sano

Toyohiro Uchiumi

Kanzou Yoshikawa

Takao Yasue

Katsuo Murakami

Seishiro Mitsuhashi

Toshiro Kajiwara

Masao Karino

Takayoshi Nagai

Junichiro Hoshizaki

Takashi Osawa

Osamu Myodo

Yujiro Kamano

Goroku Kobayashi

Kazutoshi Ishikawa

Takashi Ohsawa

Takashi Hashimoto

Kenji Suzuki

Hiroshi Ito

Toshio Yamada

Shinji Tanabe

Hiroshi Yamazaki

Michihiro Tsuchihashi

Masakatsu Suzuki

Toshiharu Fujita

Hiromi Adachi

Shinichiro Nagano

Yoshiji Minagawa

Mitsuyuki Futatsugi

Fuminobu Takizawa

Soichiro Okuda

Makoto Kosaka

Shunichi Morimoto

Yoshinori Anazi

Tamami Tsuchiya

Harumi Sawada

Hisae Nishimatsu

Kazuo Yoshika

Hrumi Sawada

Barrier ribs of the second type ( ) of the same height and material as barrier ribs of the first type ( ) are formed on a second substrate in parallel with each other along a first direction (D ) to which display electrodes XE and YE extend. Further, phosphors ( ) adhere to both side surface portions ( W and W ) of the barrier ribs of the second type ( ). This achieves a surface discharge type PDP capable of reducing a loss of ultraviolet rays due to repetition of the self absorption and emission of ultraviolet rays, and preventing the leakage of luminescence and discharge to adjacent display lines.

Surface discharge type plasma display panel with intersecting barrier ribs

Of three primary color phosphors ( ) formed in unit luminescent areas (EU) constituting a pixel (EG), the width of a blue phosphor ( B) is about twice the width of red and green phosphors ( R, G). This allows a white color temperature of 9300 K without causing deterioration of the phosphors ( ) and degrading red and green gradations.

Surface discharge type plasma display panel with blue luminescent area substantially wider than red and green luminescent areas

Barrier ribs of the second type (,) of the same height and material as barrier ribs of the first type (,) are formed on a second substrate in parallel with each other along a first direction (D,) to which display electrodes XE and YE extend. Further, phosphors (,) adhere to both side surface portions (,W,and,W,) of the barrier ribs of the second type (,). This achieves a surface discharge type PDP capable of reducing a loss of ultraviolet rays due to repetition of the self absorption and emission of ultraviolet rays, and preventing the leakage of luminescence and discharge to adjacent display lines.

A 3-electrode, surface-discharge type plasma display is capable of offsetting a radiation fields which is generated at the time of displaying, to reduce radiation noises. To drive the plasma display, an X-electrode and a Y-electrode are separated to an even number (2m) and an odd number (2m-1), respectively. During a resetting period and an addressing period, pulse voltage is applied to the even-numbered and odd-numbered electrodes at the same time, whereas in a sustained discharge period, the phase of the pulse voltage applied to the even-numbered electrode is delayed by 180 degrees from that applied to the odd-numbered electrode.

Plasma display

The present invention provides a rare gas discharge fluorescent lamp device which is long in life and high in brightness and efficiency. The lamp device basically comprises a rare gas discharge fluorescent lamp wherein rare gas is enclosed in the inside of a glass bulb which has a fluorescent layer formed on an inner face thereof and has a pair of electrodes at the opposite ends thereof. In one embodiment, it further comprises a dc power source and a resonance circuit for generating pulse-like voltage across the pair of electrodes having the time rate of energization time to a period higher than 5% but lower than 70% and the energization time within a period shorter than 150 .mu.sec, and in another embodiment, it further comprises a high-frequency ac power source and an electric voltage generating means; to generate pulse-like voltage across a pair of electrodes of the lamp wherein an energization time of the pulse-like voltage is equal to a half period of a wave form applied from ac power source and the idle time integral-number times as long as the half period of the wave form applied from the ac power source.

Rare gas discharge fluorescent lamp device

A discharge lamp having a large light output and a stable discharge. On an external surface of a cylindrical glass bulb enclosing a rare gas such as xenon, a pair of beltlike electrodes are mounted so as to face each other. A light output part is provided between the electrodes, and the electrodes are situated close to each other on the opposite side to the light output part. An image display device is constituted by arranging a plurality of the discharge lamps.

Discharge lamp, image display device using the same and discharge lamp

A gas discharge image display is formed by disposing a plurality of fluorescent lamps 1 each comprising a glass bulb 2 within which a rare gas is sealed, one or more pairs of external electrodes 5a and 5b located on the outer wall of the glass bulb 2, and a fluorescent layer 3 formed on the inner wall of the container facing the external electrodes 5a and 5b. An alternating voltage pulse is applied between the paired external electrodes 5a and 5b by an X drive circuit 9 and a Y drive circuit 10 for discharge light emission, thereby displaying an image. The pressure and alternating voltage in the fluorescent lamp 1 are changed in response to the type of fluorescent material, thereby making near light emission and discharge characteristics of the discharge lamps which differ in electric characteristics.

Method and apparatus for controlling an image display having gas

A surface luminous lighting unit has a light panel comprising a plurality of light guiding plates laminated in different lengths. The longer side of the light panel is made shorter than the distance between filaments of a lamp, and longer than the distance between the portions where a luminance of the lamp is equal to 75% of the maximum luminance of the lamp. The surface luminous lighting unit comprises a light guide which comprises a plurality of light guiding plates in different length laminated in such a manner that the sides of those plates where light enters are made level with each other, where the other sides thereof are arranged in a step-like. A linear light source is affixed to the light entering side of the light guide, and a reflector is affixed to the light exiting side of the light guide in such a manner as to extend thereover.

Surface luminous lighting unit

The present invention provides a rare gas discharge fluorescent lamp device which is long in life and high in brightness and efficiency. The lamp device basically comprises a rare gas discharge fluroescent lamp wherein rare gas is enclosed in the inside of a glass bulb which has a fluorescent layer formed on an inner face thereof and has a pair of electrodes at the opposite ends thereof. In one embodiment, it further comprises a dc power source and a resonance circuit for generating pulse-like voltage across the pair of electrodes having the time rate of energization time to a period higher than 5% but lower than 70% and the energization time within a period shorter than 150 .mu.sec, and in another embodiment, it further comprises a high-frequency ac power source and an electric voltage generating means to generate pulse-like voltage across a pair of electrodes of the lamp wherein an energization time of the pulse-like voltage is equal to a half period of a wave form applied from ac power source and the idle time integral-number times as long as the half period of the wave form applied from the ac power source.

A green-light-emitting rare gas discharge lamp includes a glass tube filled with at least one selected from the group consisting of xenon, neon, helium, argon and krypton as a rare gas capable of emitting vacuum ultraviolet rays of a wavelength of not more than 200 nm, and includes on an inner surface of the glass tube a layer of a green-light-emitting phosphor having terbium-activated yttrium silicate, whereby it is intended to obtain enhanced performance as a green-light-emitting light source and to put the discharge lamp to practical use as a green-light-emitting light source for office automation equipment, for instance.

Green-light-emitting rare gas discharge lamp

The invention provides a rare gas discharge fluorescent lamp device which is long in life and high in brightness and efficiency. The lamp device comprises a rare gas discharge fluorescent lamp including a glass bulb having xenon, argon or krypton gas enclosed therein, a fluorescent layer formed on an inner face of the bulb, and a pair of electrodes located at the opposite ends of the bulb. A pulse-like voltage wherein the ratio of an energization period with respect to one cycle is higher than 5% but lower than 70% (xenon or krypton gas) or 80% (argon gas) and the energization period is shorter than 150 .mu.sec is applied between the electrodes of the lamp. Such pulse-like voltage is produced from a circuit including a dc power source, a pulse signal source, and a switching element for controlling application of a voltage of the dc power source or such voltage boosted by a boosting transformer or a resonance circuit. Where the negative electrode includes a filament coil, a rectifying element is connected between the electrodes of the lamp for allowing pre-heating of the filament coil.

The invention provides a rare gas discharge fluorescent lamp device which is long in life and high in brightness and efficiency. The lamp device comprises a rare gas discharge fluorescent lamp including a bulb having rare gas such as xenon, argon or krypton gas enclosed therein, a fluorescent layer formed on an inner face of the bulb, a reflecting film formed on an inner face of the fluorescent layer, and a pair of electrodes located at the opposite ends of the bulb. The lamp device further comprises a power source for applying a voltage across the electrodes, and pulse voltage forming means connected between the electrodes and the power source for forming a dc pulse voltage from a voltage supplied from the power source. The dc pulse voltage thus formed is applied across the electrodes to cause the lamp to be lit. The pulse frequency of the pulse voltage and the enclosed gas pressure are determined depending upon the rare gas employed, and particularly where dc rectangular pulses are used, the duty ratio is also determined depending upon the rare gas employed.

A discharge lamp comprises a substantially straight glass bulb having a discharge gas charged therein and an electrode provided at each longitudinal end portion of the bulb on the outer surface thereof. A high frequency voltage is applied across the electrodes of the discharge lamp. Each end portion has an outer surface area per unit length of the bulb larger than that at light emitting portion of the bulb. The outer surface area may be uneven or in the shape of ridges and furrows at the end portions to create a large surface area, the electrodes being configured to the ridges and furrows. The end portions may have a larger diameter than that of the light emitting portion of the bulb so that they have a larger surface area contacting with the bulb. Each of the electrodes may have a narrow belt-shaped elongate portion on the outer surface of the bulb extending longitudinally within toward the middle portion, thereby allowing use of a lower discharge voltage. The fluophor may be applied to the inner surface area except the surface opposite the electrodes.

Discharge lamp with external electrodes

Fluorescent lamp

Growing community of inventors

Kanagawa, Japan

Takeo Saikatsu