Mitsubishi Denki Kabushiki Kaisha

Masao Karino

Sadayuki Matsumoto

Takeo Saikatsu

Takehiko Sakurai

Hiroyoshi Yamazaki

Osamu Myodo

Takashi Hashimoto

Kenji Suzuki

Takahiro Urakabe

Shigeki Harada

Makoto Yamanoshita

Makoto Ota

Toyohiro Fujiwara

Hiroshi Sawamura

Harumi Sawada

A method of driving a plasma display panel for generating picture or image with high quality while suppressing luminance to a low level in the display in black. One field for image display is composed of at least two different types of subfields first and second subfields. In the first subfield (subfield A), a reset period is provided in which after a priming pulse (Pp) having a voltage value and a pulse width has been applied between X- and Y-row electrodes for causing discharge to occur in all of pixels, then the voltage applied between both the electrodes is set to zero for erasing wall charge after the discharge of all of the pixels, while in the second subfield (subfield B), a reset period is provided in which an erasing pulse (Ep) having a voltage value and a pulse width for causing only the pixels discharged in the preceding subfield to be discharged has been applied for allowing only the pixels discharged in the preceding subfield to be discharged, the wall charge is erased by setting to zero the voltage applied between the X- and Y-row electrodes.

Plasma display panel driving method and plasma display panel device

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 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 new type of display unit is provided. A light emitting body such as a fluorescent lamp is disposed behind an elongated display panel. The middle section of the fluorescent lamp extends parallel to the elongated display panel to face it from end to end. The opposite ends of the lamp are bent if necessary.

Display unit with bent fluorescent lamp

Growing community of inventors

Kanagawa, Japan

Masao Karino