Hitachi, Ltd.

Other

Takhiro Yamaguchi

Shigeo Mikoshiba

Kohsaku Toda

Masaji Ishigaki

Takashi Sasaki

Keizo Suzuki

Hiroshi Ohtaka

Yuji Sano

Yukio Fukui

Norio Yatsuda

Takeo Masuda

Michitaka Ohsawa

Masatoshi Shiiki

Masayuki Shibata

Takahisa Mizuta

Takahiro Yamaguchi

Eiji Matsuzaki

Nobuyuki Ushifusa

Yuichiro Kimura

Teruki Suzuki

Choichiro Okazaki

Akihiko Kougami

Seiichi Tsuchida

Norio Goto

Tadashi Furukawa

Masayuki Inoue

Yoshimi Kawanami

Tomokatsu Kishi

Atsushi Yokoyama

Yasunobu Hashimoto

Makoto Miyamoto

Kunikazu Ohnishi

Tetsu Ohishi

Ryohei Satoh

Akitsuna Yuhara

Kenichi Yamamoto

Kunio Ando

Atsuo Osawa

Nobuo Azuma

Seiichi Yasumoto

Yoshie Kodera

Michifumi Kawai

Shirun Ho

Hideshi Fukumoto

Ken Kumakura

Yasuji Noguchi

Tomohiko Murase

Teruo Takai

Ken Hashimoto

Hiroshi Nogami

Hideo Onuki

Yuichi Ikeda

Tadayoshi Oikawa

Nobuhiro Tokusyuku

Luminance of a plasma display is enhanced while suppressing deterioration in resolution. In a plasma display module comprising panel sections () and a circuit section () and performing display by receiving an interlace signal, two horizontal lines adjacent vertically in each of odd field and even field form a set, two vertically adjacent cells belonging to a set of two horizontal lines display one pixel, each field consists of a plurality of subframes, and two cells in the set are lighted or unlighted simultaneously in a certain subframe at least for some display load rate wherein the ratio of emission intensity is different from 1 when the two cells are lighted simultaneously.

Plasma display module and its driving method, and plasma display

A plasma display includes a display panel and a driving circuit for driving the display panel. A space for at least one color, of spaces between barrier ribs for defining discharge spaces for red, green and blue colors of the display panel is different from the spaces for other colors.

Adjustment of luminance balance of red, green and blue light emissions for plasma display by using different sized areas of phosphor layers producing corresponding colors

A discharge type display apparatus for displaying images through discharges in a discharge gas enclosed in discharge spaces of the apparatus. The discharge gas is a mixed gas including at least Xe, He and Ne. A mixed ratio of He to Ne in the gas mixture is set approximately for 50% in volume at most.

Display panel and discharge type display apparatus having mixture of three gases

A plasma display panel driving method for a display panel having a plurality of electrodes forming cells, including a first electrode group arranged on a permeable substrate and being capable of being driven in common, a second electrode group arranged in parallel with the first electrode group on the permeable substrate and being capable of being driven independently, a third electrode group arranged perpendicular to the first and second electrode groups on another substrate and being capable of being driven independently. The driving method supplying a voltage with a fast rising leading edge so as to immediately produce a maximum electric discharge one time per a sub-field in a cell in which an electric discharge was performed beforehand and supplying another voltage without causing any electric discharge under a first condition.

Plasma display, driving apparatus for a plasma display panel and driving method thereof

In an operation of an address period for addressing cells of a display device, such as a plasma display panel, comprising a plurality of cells of three kinds, red (R), green (G), blue (B), which are arranged on a plane for forming a display surface thereof, in which each of said cells comprising: a pair of transparent electrodes provided in parallel to each other; an address electrode being positioned opposing the pair of transparent electrodes; luminescence medium provided on the address electrode; and a discharge space being defined between the pair of transparent electrodes and said fluorescence medium on the address electrode, wherein the address discharge is conducted by applying an address voltage to the address electrode, and the address voltage applied is determined depending upon the each kind of the cells, R, G and B.

Display device and driving method thereof

A plasma display panel has a first substrate including a first dielectric layer which covers a plurality of address electrodes; back face barrier ribs, each of which is located between two neighboring address electrodes; a fluorescent layer which covers the back face barrier ribs and the first dielectric layer; and a second substrate including plural pairs of X sustain electrodes and Y sustain electrodes, which are arranged to cross at right angles to the address electrodes, and a second dielectric layer which covers the sustain electrodes. The first substrate is arranged opposite to the second substrate via a discharge space which is filled with gas for radiating ultraviolet rays to make the fluorescent layer emit light and buffer gas, and the thickness of the second dielectric layer in the second substrate is set to be larger at a portion between the X and Y sustain electrodes.

Plasma display panel

The present specification and drawings disclose a technique to display image on the display panel using subfield. Particularly, it is disclosed that the technique for conducting the reset operation by impressing, to the electrode of cells, a plurality of reset pulses per one subfield in the subfield period for the reset operation and then conducting the address operation for selecting cells for display discharge. Further, it is disclosed that the display technique for causing the cells of display panel to conduct display discharge for image display through the reset operation and address operation. Namely, it is the technique for impressing the auxiliary pulse to the electrode of cells after impression of reset pulse for reset operation to form charges in inverse voltage to the scan pulse during the address operation and then conducting the address operation for selecting the cells for display discharge.

Display panel driving method and discharge type display apparatus

A plasma display system has a plasma display panel including a pair of base plates for forming a plurality of discharge cells therebetween, and a plurality of pairs of electrodes for sustaining discharge to form plasma through a dielectric substance thereon in the discharge cells. The pairs of electrodes for sustaining discharge are disposed on a same one of the pair of base plates. The plasma display panel is configured such that a discharge current integrated over 40% of a discharge time Td from a start of the discharge time Td is smaller than a discharge current integrated over a remainder of the discharge time Td in one discharge, wherein the discharge time Td is defined as a time interval over which a discharge current does not drop to less than 5% of its maximum value in one discharge.

Plasma display system

A tone display method for displaying a tone of an image in a display system which divides a time width of a field of an image signal into a plurality of weighted subfields and controls operation of the subfields. The tone display method includes the steps of coding the image signal in the plurality of weighted subfields the plurality of weighted subfields including a plurality of most significant subfields having respective weights which are substantially equal to one another, and a plurality of less significant subfields having respective weights each of which is less than each of the weights of the most significant subfields, a sum of all of the weights of the less significant subfields being greater than each of the weights of the most significant subfields, the coding being chosen from a plurality of codings all representing substantially a same tone level when a tone level of the image signal is not less than each of the weights of the most significant subfields, and displaying the image signal coded with the chosen coding.

Tone display method and apparatus for displaying image signal

A plasma display panel driving system having common X electrodes arranged on a front glass substrate driven in common, independent Y electrodes arranged parallel to the common X electrodes on the front glass substrate driven independently, address A electrodes arranged perpendicular to the common X electrodes and the independent Y electrodes on the back glass substrate driven independently, and means for performing at least one electric discharge for equalizing electrically charged particles in a cell in which another electrically charged particle is produced beforehand, thereby improving contrast. Erasing and polarization of electrically charged particles are performed by a fine line erasing pulse after a sustaining period, and an equalizing pulse having a high voltage level is supplied to the independent Y electrode to which the last fine line erasing pulse is supplied, and a regulating pulse is supplied to the common X electrode after supplying the equalizing pulse. Further, a field block having plurality of sub-fields are provided, and a full writing electric discharge and a fine line erasing electric discharge are performed in the first sub-field of each field block for reducing the number of electric discharges.

Plasma display, driving apparatus of plasma display panel and driving system thereof

A plasma display panel driving system and method for a display panel having a first common electrode and first independent electrodes arranged at a back plate side, a second common electrode and second independent electrodes arranged at a face plate side, an inner partition positioned between the first common and independent electrodes at the back plate side and the second common and independent electrodes at the face plate side and having an aperture therein connecting a space at the back plate side and a space at the face plate side, and a fluorescent layer arranged in the space at the face plate side. The driving system and method includes a driver for driving the first and second independent and common electrodes through a full writing period, a front surface erasing period, a writing period, and a discharge sustaining period, including supplying a first full writing pulse to the first common electrode at the back plate side and a second full writing pulse having a polarity which is opposite to the polarity of the first full writing pulse to the first independent electrodes at the back plate side for causing discharge between the first common and independent electrodes in the full writing period.

Plasma display panel driving system and method

A display apparatus and display method are provided for a display panel having pixels arranged in a matrix form for displaying an image on a effective display area. Horizontal electrodes and vertical electrodes in the display panel are scanned for selectively illuminating said pixels by using a time sharing drive method in which one field period is divided into plural sub-fields weighted according to a sustaining period. As a result, an effective display area is divided into plural areas, no scanning for selecting a light emitting pixel is executed in a non-display area, and the number of sub-fields is increased in an area in which display in multiple gradations is required in a display area to obtain sufficient gradation. Instead of increasing the number of the sub-fields, the total sustaining period per one field is increased to obtain sufficient brightness. According to a feature of the invention, another area is provided in which the number of sub-fields is limited to the required minimum in which display in multiple gradations is not required. According to other feature of the invention, another area having few sub-fields is prepared instead of providing the non-display area.

Display apparatus and display method thereof

A plasma display device is capable of controlling the brightness of the entire image on a screen over a wide range without impairing a predetermined number of display gradations determined by the dynamic range of an A/D converter, an analogue input circuit and the like. For this purpose, the plasma display device is provided with means for changing the discharge condition (number of discharge pulses, discharge voltage, discharge voltage waveform and the like) during priming discharging, which is effected for initialization, in accordance with the brightness control to control the brightness of light emission during image display.

Plasma display device and driving method

A intra-field time division tone display method for dividing the time width in a field of a TV signal into a plurality of subfields in the pixel storing time direction and displaying the TV image by controlling the presence or absence of light emission of the subfields and an apparatus therefor, wherein there are at least two subfields (most significant subfields) whose luminant time widths are longest and almost equal and when it is assumed that the tones are displayed in the ascending order starting from the lowest level of tone in light emission of the subfields, the tone of a TV image signal is displayed under a rule that two or more light emissions are not started from the aforementioned at least two most significant subfields at the same time, accordingly the dynamic false contour noise of a moving image followed by movement of the viewing point can be reduced remarkably and a moving image of high image quality and high quality can be obtained.

Growing community of inventors

Yokohama, Japan

Masaji Ishigaki