Hitachi, Ltd.

Shinichi Shinada

Shigeo Mikoshiba

Yukio Okamoto

Shoji Shirai

Mutsumi Suzuki

Kenkichi Suzuki

Soichiro Ogawa

Osamu Igarashi

Tomokazu Shiga

Akihiko Kougami

Takahiro Matsumoto

Akihiko Kohgami

Tadao Okabe

Kazuhito Ikarashi

Tadao Okabe, Deceased

In order to operate a discharge apparatus, a first voltage having a first frequency is applied to electrodes. Moreover, a second voltage having a second frequency higher than the first frequency is applied to the first voltage. The waveform of the voltage having the second frequency may be an attenuated one which is synchronized with the first frequency. As a result of this voltage superposition, the electrons, ions, or plasma in the already established discharge fluctuate with the change in the electric field. If the second frequency is selected to be equal or close to the resonance frequency of the electrons, ions, or plasma existing in the already established discharge, there occurs the resonance phenomenon of the electrons, ions, or plasma. This phenomenon raises the temperature of those particles. As a result, the electron temperature approaches to a value preferable for emission of visible light or ultraviolet rays so that the luminous efficiency is improved.

Driving method of discharge apparatus

In a display device for pictures, etc., adequate brightness of pictures to be displayed is provided by varying the luminous times of the luminous elements making up the a display panel. The luminous elements receive multiple-bit codes representing levels of brightness from signals to be displayed. A time corresponding to a field of television signals is divided into a plurality of sub-fields corresponding to the bits of a multiple-bit code. The plurality of sub-fields have lengths of time proportional to weights of the corresponding bits. The luminous elements have different levels of brightness in sub-fields corresponding to bits of a multiple-bit binary code. For each luminous element, the time interval from a light emission start time in a sub-field where the first light emission occurs in a time corresponding to a field of television signals till a light emission start time in a sub-field where the last light emission occurs in a time corresponding to the next field of television signals is made shorter than the critical fusion period of the perception characteristic of human eyes.

Tone display method and apparatus reducing flicker

A method of driving a gas-discharge display panel in which a plurality of discharge cells constructed of display anodes and cathodes are arrayed in the form of a matrix, comprising affording a predetermined phase difference between a display pulse which is impressed on the discharge cell and a display pulse which is impressed on the discharge cell adjoining the former cell.

Method of driving gas-discharge panel

A driving apparatus for a gas discharge display panel having a plurality of cathodes and a plurality of anodes arranged in a matrix includes a cathode pulse generator and an anode pulse generator, with the anode pulse generator generating negative display anode pulses made up of auxiliary discharge pulses (width=tS) and display pulses of smaller pulse width (width=tD, tD.ltoreq.tS) corresponding to information display signals. The anode pulse generator preferably also provides positive display anode pulses so that selection between negative and positive display anode pulses is possible.

Driving apparatus for a gas discharge display panel

In a gas-discharge display device, a plurality of parallel cathodes connected to cathode terminals (K.PHI..sub.1 to K.PHI..sub.4) by multiphase connection are disposed in equally spaced apart relation on one surface of a substrate, while a plurality of parallel and equally spaced-apart anodes are disposed on the rear surface of a face plate in a relation crossing with the cathodes, and the fact plate is superposed on the substrate through barrier ribs defining a discharge space. In the display device, time-serial multiphase pulse voltage trains are applied to the individual cathodes respectively, while a train of pulses of large width corresponding to display information is applied to each of the anodes in a relation superposed on a train of pulses of small width used for initiation of an auxiliary discharge.

Gas-discharge display device

A gas discharge display apparatus includes a substrate on which a number of electrodes are formed in a row with a distance therebetween and interconnected through polyphase connections. Bipolar pulse voltages are sequentially applied to each phase of the polyphase connections to thereby cause each of the electrodes to operate alternately as an anode and a cathode on a time division basis, whereby discharge produced between the anode and the cathode is caused to perform self-scanning.

Gas discharge display apparatus

A gas discharge display apparatus comprises at least a number of anodes and cathodes each disposed in opposition to each of the anodes so that the anodes and the cathodes are arrayed alternately with each other. The anodes and the cathodes are wired, respectively, in polyphase connections. Discharge stabilizing resistors are connected in series to the polyphase connections leading to either the anodes or cathodes. Pulse voltages are successively applied to the anodes and the cathodes so that the discharge produced between both electrodes is caused to perform self-scanning, while the pulse voltages are applied to the polyphase connections leading to the anodes during a period determined in accordance with an input signal to be displayed, thereby to produce discharge between selected ones of anodes and cathodes determined in accordance with the input signal, said discharge being imparted with a memory effect. By controlling pulse duration of the pulse voltages applied during the period determined by the input signal, brightness of display element(s) selected in accordance with the input signal is controlled in a rather arbitrary manner.

Gas discharge display apparatus capable of emphasis display

A method of driving a gas discharge light-emitting device is disclosed which utilizes Townsend emission occurring transiently when discharge is started by applying power to a gas discharge light-emitting device so as to cause discharge and stopping the application of the power approximately when the ratio of radiation output of the discharge to the charged power starts decreasing.

Method of driving gas discharge light-emitting devices

A method of driving a memory panel having first electrode, second electrode, third electrode for discharging upon application of an applied voltage for first discharge via first discharge space between first and third electrodes and for discharging upon application of an applied voltage for second discharge via second discharge space forming part of first discharge space between second and third electrodes, a plurality of gas discharge cells filled sealingly with discharging gas in said respective discharge spaces, and series resistors provided in said respective third electrodes, comprising a step of varying the applied voltage for first or second discharge spaces or both voltages therefor in such a manner that a self-supporting discharge exists only in either one of said first and second discharge spaces.

Method of driving flat discharge panel

A flat discharge display panel has a transparent face plate made of an electrically insulating material, a base or substrate made of an electrically insulating material, an intermediate insulating plate interposed between the face plate and the base or substrate, a plurality of major discharge cells defined between the face plate and the intermediate insulating plate, a plurality of anodes each disposed in each of the major discharge cells, a plurality of auxiliary discharge cells defined between the intermediate insulating plate and the base or substrate, a plurality of cathodes each disposed in each of the auxiliary discharge cells, a plurality of of auxiliary anodes each disposed in each of the auxiliary discharge cells, the paired main and auxiliary discharge cells being intercommunicated through a through hole formed through the intermediate insulating plate, and the paired major and auxiliary discharge cells constituting a gas discharge cell, whereby the positive columns produced in each gas discharge cell as well as the discharge paths are in parallel with the face plate.

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Kokubunji, Japan

Shinichi Shinada