Fujitsu Corporation

Kenji Murase

Hisashi Yamaguchi

Hirofumi Kashiwara

Shizuo Andoh

Hiroyuki Ishizaki

Sei Sato

Toyoshi Kawada

Hideo Yamashita

Yoichi Ueda

Tomoyuki Unotoro

Yasunari Shirouchi

A self shift type gas discharge panel in which the display screen comprises a plurality of shift lines arranged in parallel in the vertical direction, and a system and method for driving the panel. The display screen is divided into several sections both in the horizontal and vertical directions to form a plurality of display areas, and the shift operation can be performed independently in each of these display areas. While the forward shift operation is conducted in a single selected display area, a reciprocating or sway shift operation, or a stationary display, obtain selectively in the remaining display areas with such a configuration, so that an editing operation can be realized which is similar to that realized by the existing well known matrix display gas discharge panel. As a result, the display function can be much improved.

Self shift type gas discharge panel, driving system

A first glass substrate supports a plurality of electrodes arranged in concentric circles. A second glass substrate supports a plurality of shift electrodes arranged radially. The substrates are positioned face to face with a specified space between them filled with an ionizable gas. The radially arranged shift electrodes are periodically connected to common buses each connected to a corresponding one of a plurality of shift driver circuits equal in number to the buses. At least one of the shift electrodes is selectively connected to a write driver circuit and to one of the shift driver circuits. When the one of the shift electrodes is energized by a signal from the write driver circuit, discharge spots are generated at the intersection of the one of the shift electrodes and the concentrically arranged electrodes. The discharge spots are endlessly shifted in clockwise or counterclockwise direction along the concentrically arranged electrodes through the switching of operating voltages applied sequentially to the shift electrodes from the shift driver circuits via the buses.

Gas discharge display apparatus

Methods and systems for driving a self-shift type of gas discharge panel utilize a plurality of basic pulse trains for the shifting of discharge spots. The pulse trains are applied cyclically and sequentially to each phase of a multi-phase display cell array, each cycle comprising several unit periods, and the array having regularity in its arrangement. This facilitates control of timing for phase switching, and accurate shift operation can be realized by variation of the basic pulse trains.

System for driving a gas discharge panel

An improved driving system and method for shifting a discharge spot from a given discharge cell to an adjacent discharge cell in an A.C. gas discharge, or plasma display, panel, having opposed sets of electrodes respectively covered with corresponding dielectric layers thereby insulated from the discharge gas space. One set of electrodes comprises common electrodes extending in parallel relationship and defining the direction of propagation of the shifted discharge spots. The other set of electrodes, spaced apart from the first set by the gas space, extends in parallel relation transversely to the first common electrodes, and comprise the shift electrodes. The shift electrodes are arranged in groups of a predetermined number in each group and a corresponding number of buses permits selective application of shift pulses to the respectively associated shift electrodes in sequence for each group and simultaneously for the successive groups. An improved operating margin for the shift function is achieved by utilizing the priming discharge effect of a given cell currently discharging, to reduce the necessary firing voltage at an adjacent discharge cell to which the current discharge spot is to be shifted, while minimizing the probability of misfiring at corresponding, remote cells energized in the same phases. An overlap pulse is applied to a discharge cell at which a discharge spot currently is established, to provide a priming discharge for the adjacent cell to which the spot is to be shifted. A shift pulse applied to the adjacent cell terminates after termination of the overlap pulse and thereby produces a lateral field between the two adjacent discharge cells whereby the space charge generated by the priming discharge is attracted to and reduces the necessary firing voltage at the adjacent cell. The duration of the overlap pulse in relation to the amplitude of the shift pulse defines an operating margin for the shift operation which is optimized over a preferred range of the overlap pulse duration.

Driving system and method for shifting a discharge spot in a plasma

A coordinate position information output device is disclosed in which the impedance at a position addressed by a contact pen, a light pen, a magnetic pen or the like is varied; a forward current is caused to flow by the impedance change in a charge storage diode; and a backward current flowing in the charge storage diode for a moment immediately thereafter is utilized as coordinate position information.

Coordinate position information output device

A system for reading out information in a plasma display memory panel having a set of X and a set of Y electrodes is disclosed in which a forward current is conducted through unidirectional conducting devices having a charge storage effect, for example, charge storage diodes, connected to the X or Y electrodes; a read voltage is applied to one of a selected one of the Y sets of and X electrodes; a charging current due to the read voltage is conducted through the charge storage diodes in a backward direction making use of their backward recovery time; a gas discharge current, after the charging current terminates, flows in the stray capacitance of the selected X or Y electrode, raising its potential relative to the ground potential; and the potential rise is detected to thereby effect read-out of the information.

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Kakogawa, Japan

Kenji Murase