US3803449A - Method and apparatus for manipulating discrete discharge in a multiple discharge gaseous discharge panel - Google Patents

Method and apparatus for manipulating discrete discharge in a multiple discharge gaseous discharge panel Download PDF

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US3803449A
US3803449A US00139533A US13953371A US3803449A US 3803449 A US3803449 A US 3803449A US 00139533 A US00139533 A US 00139533A US 13953371 A US13953371 A US 13953371A US 3803449 A US3803449 A US 3803449A
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discharge
conductors
invention defined
pulse
panel
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Larry J Schmersal
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Techneglas LLC
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Owens Illinois Inc
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Priority to CA139,606A priority patent/CA957044A/en
Priority to DE2221202A priority patent/DE2221202B2/de
Priority to GB5402974A priority patent/GB1399132A/en
Priority to FR727215567A priority patent/FR2135582B1/fr
Priority to GB2031672A priority patent/GB1399131A/en
Priority to IT49994/72A priority patent/IT960270B/it
Priority to GB5403074A priority patent/GB1399133A/en
Priority to JP47044517A priority patent/JPS5840190B1/ja
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/297—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels using opposed discharge type panels

Definitions

  • the present invention is directed to providing a new method and apparatus for sustaining, writing and erasing information on a gaseous discharge panel of the non-cellulated type disclosed in Baker et al. U.S. Pat. No. 3,499,167 and type disclosed in Bitzer et al. U.S. Pat. No. 3,559,199. In the Baker et al.
  • patent there is disclosed a gas discharge display/memory device in which a pair of glass plate members are joined in spaced apart relation, the glass plate members carrying dielectrically coated multiple conductor arrays, the row and column conductor arrays in the active panel area being comprised of conductors extending parallel to the long direction of the plates, respectively.
  • the plates are joined by a spacer sealant with their long axes transverse to each other with the cross points of the conductor arrays defining a matrix or array of discrete discharge sites each of which is discretely manipulatable by control of the potentials applied to the conductors.
  • the maintaining potentials for the discharge in such panels and the discrete sites is constituted by a periodically applied voltage, normally designated as the sustainer voltage.
  • the sustainer voltage could be a sine wave, square wave as well as a number of other waveforms.
  • gaps were provided in the sustainer voltage so as to permit addressing of discrete sites in the panel as 'is disclosed in the aforementioned Bi'tzer patent (as also disclosed in Mayer et al. U.S. Pat. No. 3,573,542).
  • the discharge condition manipulating voltages may be bipolar pulse potentials which are algebraically combined in various ways and at various times with the sustainer potential to manipulate the discharge condition, particularly in rapidly turning off aselected discrete discharge site which has previously been turned on.
  • the operation of sustaining, writing and erasing information e.g. discrete discharges and selected discharge sites in a discharge panel of the general type disclosed in the aforementioned Baker et al. patent, may be accomplished by a'constant amplitude pulse square wave sustainer with no additional circuitry required. Address operations, as well as sustain operations are accomplished entirely by means of modulation of the square wave pulses so as to control the strength of the discharge. In addition, it is possible to accomplish panel conditioning operations by means of a further extension of this concept. Moreover, by utilizing a sustaining waveform of the character disclosed herein, the aging is reduced; that is, the change in electricalcharacteristics of the panel, as a function of time for which they are burned or turned on, is improved. In addition, this type of sustainer and control can yield more light output and be more efficient than previous sustainer systems.
  • one primary advantage over previous write/erase/sustain electronic systems for manipulating the discharge condition of selected discharge sites of a gaseous discharge panel is that this invention permits elimination of roughly half of the circuits required in previous address system.
  • Previous address systems as indicated above, separated the functions of the sustain operation circuitry from the write/erase circuitry.
  • the present invention accomplishes this operation within the framework of the sustainer and control circuits therefore.
  • This invention may require more sustainers than in previous systems, however, as will appear further hereinafter, the multiplexing approach to such sustainers provides a degree of flexibility not heretofore available.
  • the invention also permits writing or erasing on either the positive or negative cycles of the sustainer at no additional cost since this means that the sustainer must produce a write or an erase pulse of an opposite polarity which the sustainers are easily capable of providing. Moreover, only one power supply will be required for writing and erasing and sustaining as well as even conditioning the panel. With respect to the panel itself, there are a number of notable advantages resulting from this invention. In previous sustainer voltage designs, there were a number of difficulties. When the sustainer voltage was at a sine waveform, the discharges were not intense enough and did not produce enough light. However, in square waves, even though enough light was produced, the high current tended to limit panel life.
  • FIG. 1 is a simplified diagram of-a gaseous discharge panel device and electrical diagram incorporating the invention
  • FIG. 2 is an explanatory partial cross-sectional view, enlarged, but not to proportional scale
  • FIGS. 3A, 3B are simplified waveform diagrams illus- I trating one basic feature of the invention.
  • FIG. 4A is a diagram showing the relation of electron and ion currents in'a discharge at one selection siteas plotted against time
  • FIG. 4B shows the site characteristics as a function of sustained pulse width for constant wall charging as well as the peak current and change in wall voltage as a function of the difference between firing voltage and applied sustain voltage
  • FIGS. 5A, 5B and 5C illustrate three sustain waveforms which may be used in the practice of the invention
  • FIG. 6 shows the vertical or column sustainmultiplexing circuit, incorporating the invention
  • FIG. 7 shows the horizontal or row sustain multiplexing circuit incorporating the invention
  • FIGS. 8A- 8J shows the sustain and erase waveforms
  • FIG. 9 shows the sustain waveforms for single discharge site operation
  • FIGS. 10A are waveforms for illustrating the bulk
  • FIGS. llA-l 1E are another set of waveforms for illustrating other aspects of the voltage conditions for the write and erase operations.
  • the discharge current of a selected discharge site in a gaseous discharge display panel of the type referenced in the above mentioned Baker et al. and Bitzer et al. patent consists essentially of an electron and an ion current.
  • the electrons are attracted to and collect upon one boundary wall of the site (the one which is instantaneously positive) and the ions to the opposite or opposing wall or boundary for the discharge site, such boundaries being defined by a dielectric or insulating coating on a crossed conductor pair locating the site.
  • the light output resulting from the discharge is due almost solely to those electrons which are energized or excited sufficiently to emit light as a spindown from a higher energy state.
  • the ion current contributes little or nothing to the light output but does contribute to the wall charging (see FIG.
  • sustainer pulse width is made to be considerably below 10 microseconds the result would be that fewer ions will be collected at the wall. This results in reduced wall voltage but, at the same time aging is reduced. While it is possible, and within the contemplation of this invention, to terminate the sustainer pulse voltage immediately after collection of all the electrons, to thereby minimize the number of ions which will impact the wall of the discharge unit, this may require that the sustainer voltage be increased in amplitude.
  • a basic aspect of this invention is that it makes use of the fact that the amount of 'wall charge transfered per each discharge is a function of the applied voltage and the duration for which that voltage is applied.
  • a gaseous discharge display panel 10 constructed generally in the manner disclosed in Baker et al. US. Pat. No. 3,499,167 is constituted by a pair of support plates 11 and 12 on which are placed row (x) conductors 13 and column (y) conductors 14, the conductor arrays having dielectric or insulative coatings 15 and 15, respectively, applied thereto.
  • the respective plates are joined in spaced apart relation by spacer sealant means 17 to form a thin gaseous discharge chamber in which may be placed a neon-argon gaseous mixture as is disclosed in Nolan application Ser. No. 764,577 filed August 1968.
  • gaseous discharge mediums may likewise be incorporated in the panel but the improvement achieved by the use of the gas mixture recited above permits the panels to be operated without thermal shock and at the same time with good and efficient light output and memory margins.
  • the individual conductors 13-1, 13-2 13-N in row conductor array 13 are driven by a row conductor sustainer multiplexing circuitry 20 and the column conductors are driven by column conductor sustainer multiplexing matrix 21.
  • the selection matrices 20 and 21 receive input signals from a signal source, not shown, but which may be a computer, keyset, tape, card reader or other data source.
  • FIG. 2 a section of the panel 10 is shown in greatly enlarged cross-section to facilitate explanation of a basic aspect of the present invention and, is to be considered in relation to the waveforms illustrated in FIGS. 3A, 3B and relationships shown in FIGS. 4A and 4B.
  • the conductor arrays 13 and 14 are dielectrically or insulatively isolated from the gaseous discharge medium 9 by thin dielectric coatings on the conductor array which form charge storage surfaces Sx and Sy for charges 25 and 26 produced on discharge. Basically, two forms of charges are produced namely, ions 25 and electrons 26.
  • the waveform shown is the waveform of the sustainer voltage as applied across to gas from conductor arrays 13 and 14.
  • FIG. 3A it is shown as a rectangular or square waveform and in FIG. 3B the current flow to the panel corresponding to the discharges occurring during the applied sustainer voltage are shown.
  • the steep rise of the sustainer voltage there is a capacitive charging current which is indicated by the numeral 30 in waveform 3B. This capacitive charging current charges the panel capacitance.
  • This surge current or discharge current 31 is the condition illustrated in FIG. 2 between conductor 31-1 and conductor 14-1.
  • the collection of electrons 25 opposite conductor 14-1 after a period of time constitutes an internal bias voltage and is sufficient to oppose the applied potential and hence terminate the discharge.
  • This termination of the discharge is indicated by a termination or cessation of the flow of discharge current in FIG. 3B.
  • FIG. 4 an enlarged drawing of the applied sustainer voltage Vs as it appears across the gas is illustrated wherein the rise time or front porch is shown as dotted portions of the waveform; the current pulses 30, 32 to charge the capacitance of the panel has not been shown.
  • the main current surge is labeled as the electron discharge current and the second time interval is labeled as ion discharge current.
  • the collection time required for roughly 90 percent of the ions 26 as well as 100 percent of the electrons 25 can be easily within a microsecond interval so that if the sustainer voltage pulse width is controlled, the ion collection time may be controlled.
  • the sustainer pulse width of 2 microseconds and 9 microseconds.
  • the panel had 128 row conductors and 128 column conductors, the conductors being spaced at 33 A: lines per inch with a discharge gap of about 4 mils and a dielectric coating between 1 to 2 mils thick with a pulsed square wave having a tsr of about 100 nanoseconds rise time and a rsp of about 27.5 microseconds.
  • the number of discharge sites were on a 64 X 64 matrix or 4,096.
  • FIG. 5 a number of different types of sustaine voltage waveform which can be used in' accordance with the invention areillustratedln all cases, the write and erase functions as well as the collection of ions is controlled by controlling the widths of the sustaining voltage wave form.
  • a negative voltage swing is used to deaccelerate the ions and permit them to impact-the wallat reduced velocity.
  • this negative voltage swing is not necessary in order to achieve the improved results set forth hereinabove.
  • FIGS. 6 and 7 illustrate typical circuits which may be used in practicing the invention. Although only a four line system is shown in each case, it is obvious that it may be expanded to any size, binary or decimal on either axis (x or y) with sector at a time address capability or with random access capability.
  • the invention requires x and y sustainer generator sources which may be similar to those shown in Wojcik application Ser. No. 135,022 filed Apr. 19, 1971, now U.S. Pat. No. 3,742,294 issued June 26, 1973, but this invention is not limited to this type.
  • the outputs of such sustainer sources should be matched in terms of logically controlled output pulse width uniformity. Control and modulation of pulse width can be accomplished in accordance with the circuits shown in FIGS. 6 and 7.
  • FIGS. 6 and 7 a portion of the vertical or columns sustain address circuitry (FIG. 6) and the horizontal or row sustain address circuitry (FIG. 7) are illustrated, respectively. It will be appreciated that various other arrangements can be used for supplying width modulated, square wave sustainer pulses to the individual row and column conductors. However, the embodiments illustrated in FIGS. 6 and 7 are preferred because this permits multiplexing of the sustainer generators.
  • the diode selection matrix circuitry per se is disclosed in detail in Johnson application Ser. No. 60,402 filed Aug. 3, 1970 and entitled Selection and Addressing Circuitry for Matrix Type Gas Display Panel.
  • the sustainer voltage per se is used to sustain, erase and write as well as perform other operations with regard to manipulating the discharge sites of the panel.
  • the numerals 50-1, 50-2, 50-3 50-N indicate the connection points of this matrix to individual column conductors or panel lines.
  • 50-1 would be connected to vertical or column conductor 14-1 etc. to supply pulse width modulated potentials to the column conductors and with respect toFIG. 7, the horizontal or row conductors 13-1, 13-2 on the panel are served or supplied with pulse width modulated potential from the point in the matrix designated -1, 60-2 60-N, respectively.
  • each such point 50 and 60 is, in effect, the nodal point, of a matrix selection element, each nodal point including diodes D1 and D2 and a resistor the anode of diode D1 and the cathode of diode D2 are connected to the nodal point for pulsing in one polarity direction whereas, the opposite situation prevails in connection with the horizontal address circuitry shown in FIG. 7 namely, the diodes D3 and D4, respectively, which occupy the same electrical position in the circuitry as do diodes D1 and D2 in the circuit of FIG. 6, have their cathode and anode, respectively, connected to the nodal point serving the conductor line on the panel. It will be appreciated that this arrangement may be reversed and the polarity circuitry shown to supply the row conductors may be used to supply the column conductors and vice versa.
  • all of the resistors R1, R2 in a row of the vertical or column sustain matrices, respectively, are connected through a switching transistors TCl to a source of supply potential VCC.
  • This voltage VCC may be used with a small control voltage (AV) to increase the select write voltage margin, if necessary.
  • AV control voltage
  • the purpose of this added voltage is that in the event that a half-select write operation range is not sufficient for a good reliable panel electronic performance, the halfselect margin may be increased by this modification.
  • the select voltage may be increased by the voltage AV. It should be noted that in all cases this need not actually be a DC voltage but may be a pulse voltage occurring only during the portion of the write cycle or any other portion of the cycle as may be required.
  • this pulse voltage could be added into the system at the VCC source by means of either a transformer in series (at point TRA, for example) with the power supply line so as to induce a pulse at the proper time.
  • the sustain power supply voltage could be utilized.
  • capacitances can be made an integral part of the panel 10, using the coatings l and 16 as dielectric for coupling such voltages to the conductor arrays.
  • the multiplexing operates as follows: when LFl is on then all of the outputs (501, 50-N) are then driven to the VCC voltage.
  • transistor LE1 If transistor LE1 is on, then all the outputs associated with that vertical line are driven low (50-1 and 50-3) so that LE1 or LE2 cannot be on when LFl is on. If LDl and LD2 with LE1 and LE2 can be used to select one output to the VCC AV level, and the rest low, which is a situation illustrated in FIG. 6 wherein LVl is on, LB2 is off, LE1 is on, and LE2 is off, this causes V2 to go high with all other low. LFl is not used in addressing but only in sustaining.
  • the multiplexing operation is as follows: when LCl is on then all of the outputs (60-1, 60-2 60N) are driven low or to ground potential. When LAl or 2 is on then all of the outputs associated with the vertical line driven thereby are high (at the voltage VCC); that is, the lines 60-1 and 60-3 are on. LA! and LA 2 cannot be on when LCl is on. Moreover, lines LAl and LA2 with LBl and LB2 may be used to select one output to ground with all other outputs at the high voltage level of VCC. As shown in FIG.
  • LBl is on, LB2 is off, LAl is on and LA2 is off so that this causes line 60-2 to be at ground potential with all other lines 60-1, 60-3, and 60-N to be at the high VCC voltage level.
  • LCl and LAl and LA2 may be used to sustain the panel in this configuration.
  • FIG. 8 voltage waveforms for illustrating a single discharge site erase operation.
  • the horizontal and vertical sustainer waveforms are illustrated in FIG. 8A and 8B respectively.
  • the application of the horizontal select and horizontal non select voltage pulses are shown in lines 8C and 8D respectively and the vertical select and vertical non select voltage wave forms are shown in lines 8E and SF respectively.
  • Waveform 8G shows the sustain voltage as seen by a single site. It will be noted that the normal sustain voltage preceding the erase operation or erase cycle occurs within the interval indicated and modifies only the pulse width of the sustainer voltage at the selected site.
  • the normal sustainer pulse width is narrowed so that while there may be a small charging current to charge a panel capacitance, the sustainer voltage is removed, effectively, prior to the initiation of the discharge so that there is no discharge during the half cycle of sustainer.
  • This removal of the sustainer thereby permits, during that time interval participation of some of the stored charge so that on the next half cycle, which is still in the same direction as the previous half cycle having had a normal discharge, there is still not another discharge because the charges are still bucking in effect the applied potential thereby providing additional time for dissipation of the stored charge.
  • the next pulse voltage appears, even though it will be the noraml sustaining voltage and of normal width, due to the dissipation of the stored charge as described, there will be subsequent discharge at that sight.
  • FIG. 9 illustrates a single write operation and waveforms.
  • the method for providing 1) bulk write, 2) bulk erase and 3) electronic conditioning (as described in I the aforementioned Baker et al. and Bitzer et al. pa-
  • the erase pulse is slightly narrower than the normal sustain pulse width and that the write pulse width is wider than the normal sustain pulse width.
  • the electronic conditioning pulse width is even Wider than the normal write pulse width but less than 15 ms. Note also the required sequence with respect to conditioning, writing and erasing as to permissible places where it might occur with respect to the phase of the sustain waveform. It is not illustrated, but it is obvious that the inverted signals could just as easily be generated since there is control over the pulse duration for either the zero condition or the Vs sustainer amplitude level.
  • the anticipated range of sustained pulse width which may be utilized in this technique is between 0.8 microseconds to 5 microseconds in duration.
  • This write/erase technique uses a method of increasing panel life through circuits
  • the particular waveforms contemplated herein applies narrow square pulses which cause a discharge to occur and after the electrons have flowed across the gap and established the wall charge, this potential is removed so that the ions which are slower moving particles clue to their mass, do not have an electric field to impact them into the dielectric or wall surfaces Sx and Sy, respectively.
  • This method is specially advantageous to square wave drive since the discharge current is approximately 10 times that of sine wave discharge.
  • a method of manipulating the discharge condition of a gas discharge information storage panel device having transversely oriented dielectrically insulated conductors on opposite sides of a thin gaseous discharge medium which comprises applying a perioditrical parameter that is modulated is the plying, in selectively timed relation, a first sequence of electrical pulses to the conductors oriented in a first direction and a second sequence of electrical pulses to conductors oriented in a second direction transverse relative to the direction of said conductors oriented in said first direction whereby the gaseous medium between said conductors has said periodically alternating pulse potential applied thereto, and constitutes a sus taining potential for discharges at any site in said panel device and modulating at least one electrical parameter of at least one pulse of a sequence as applied to the conductors oriented in one of said directions.
  • any of said electrical pulses is no greater than the time required for substantially all electrons produced on a discharge to collect on a surface of a dielectrically insulated conductor and an insignificant number of ions produced during said discharge are collected on an opposing surface of a dielectrically coated conductor.
  • pulse width is widened so as to store information at a selected discharge site, said selected site being located at the cross over point of a selected pair of transverse conductors.
  • pulse width is widened for a selected time interval on at least a plurality of conductors of one array so as to bulk write information on said panel.
  • a method of lengthening the life of a gas discharge storage device having insulated conductors supplying gas discharge condition initiating pulse potentials to the gas medium for effecting one or more discharges therein, comprising terminating said pulse potentials prior to impaction of significant number of .ions-on the insulation on said conductors.
  • the method of claim including the step of applying an ion repulsing potential to said conductors following termination of said discharge initiating pulse potentials to said conductors.
  • a synchronized sequence of rectangular shaped pulses are applied to said row and said column conduc tors in the arrays, respectively, which comprises periodically lengthening the time interval of one of the pulses applied to all conductors in at least one of said arrays.
  • pulse width is between about 0.8 microseconds and about 5 microseconds in time duration.
  • pulse width is between about 0.8 microsecond and about 5 microsecond time duration.
  • pulse time duration is initially selected to be such that during a discharge interval, the electrons produced on discharge are stored and the pulse terminated prior to any significant storage of ion charges occur.
  • said means for modulating includes at least one conductor multiplex selection circuit for selecting individual ones of said conductors respectively and modulating the time duration of pulse voltages applied thereto.
  • said multiplex selection circuit includes means for adding a voltage increase to the pulse whose time duration is modulated.
  • each selection circuit includes means for adding a voltage increase to the pulse whose time duration is modulated to aid in writing on said panel.
  • the invention defined in claim 18 including means for simultaneously lengthening the time duration of pulses applied to all conductors of an array to at least the time duration necessary to effect discharges at all sites located by said all conductors.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
  • Gas-Filled Discharge Tubes (AREA)
US00139533A 1971-05-03 1971-05-03 Method and apparatus for manipulating discrete discharge in a multiple discharge gaseous discharge panel Expired - Lifetime US3803449A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00139533A US3803449A (en) 1971-05-03 1971-05-03 Method and apparatus for manipulating discrete discharge in a multiple discharge gaseous discharge panel
CA139,606A CA957044A (en) 1971-05-03 1972-04-13 Method and apparatus for manipulating discrete discharges in a multiple discharge gaseous discharge panel
DE2221202A DE2221202B2 (de) 1971-05-03 1972-04-29 Verfahren zum Herstellen von Entladungsbedingungen in einem Gasentladungsspeicherfeld und System zur Durchführung des Verfahrens
FR727215567A FR2135582B1 (enExample) 1971-05-03 1972-05-02
GB5402974A GB1399132A (en) 1971-05-03 1972-05-02 Gas discharge devices
GB2031672A GB1399131A (en) 1971-05-03 1972-05-02 Gaseous discharge panel
IT49994/72A IT960270B (it) 1971-05-03 1972-05-02 Procedimento ed apparecchio per il pilotaggio di scariche discrete in un pannello di presentazione memoria a scariche multiple in gas
GB5403074A GB1399133A (en) 1971-05-03 1972-05-02 Gaseous discharge panels
JP47044517A JPS5840190B1 (enExample) 1971-05-03 1972-05-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00139533A US3803449A (en) 1971-05-03 1971-05-03 Method and apparatus for manipulating discrete discharge in a multiple discharge gaseous discharge panel

Publications (1)

Publication Number Publication Date
US3803449A true US3803449A (en) 1974-04-09

Family

ID=22487123

Family Applications (1)

Application Number Title Priority Date Filing Date
US00139533A Expired - Lifetime US3803449A (en) 1971-05-03 1971-05-03 Method and apparatus for manipulating discrete discharge in a multiple discharge gaseous discharge panel

Country Status (7)

Country Link
US (1) US3803449A (enExample)
JP (1) JPS5840190B1 (enExample)
CA (1) CA957044A (enExample)
DE (1) DE2221202B2 (enExample)
FR (1) FR2135582B1 (enExample)
GB (3) GB1399133A (enExample)
IT (1) IT960270B (enExample)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940755A (en) * 1973-08-22 1976-02-24 Nippon Electric Co., Ltd. Plasma display driving apparatus
US3969718A (en) * 1974-12-18 1976-07-13 Control Data Corporation Plasma panel pre-write conditioning apparatus
US4021607A (en) * 1973-05-19 1977-05-03 Sony Corporation Video display system employing drive pulse of variable amplitude and width
US4101810A (en) * 1976-05-19 1978-07-18 Owens-Illinois, Inc. System for and method of operating gas discharge display and memory
US4104563A (en) * 1976-12-30 1978-08-01 International Business Machines Corporation Writing and erasing in AC plasma displays
US20040100425A1 (en) * 2002-11-26 2004-05-27 Kang Kyoung-Ho Method and apparatus for driving panel by performing mixed address period and sustain period
US6985125B2 (en) 1999-04-26 2006-01-10 Imaging Systems Technology, Inc. Addressing of AC plasma display
US7122961B1 (en) 2002-05-21 2006-10-17 Imaging Systems Technology Positive column tubular PDP
US20060262040A1 (en) * 2005-05-23 2006-11-23 Lg Electronics Inc. Plasma display driving apparatus and driving method
US7157854B1 (en) 2002-05-21 2007-01-02 Imaging Systems Technology Tubular PDP
EP1801768A1 (en) 2005-12-22 2007-06-27 Imaging Systems Technology, Inc. SAS Addressing of surface discharge AC plasma display
US7456808B1 (en) 1999-04-26 2008-11-25 Imaging Systems Technology Images on a display
US7595774B1 (en) 1999-04-26 2009-09-29 Imaging Systems Technology Simultaneous address and sustain of plasma-shell display
US7619591B1 (en) 1999-04-26 2009-11-17 Imaging Systems Technology Addressing and sustaining of plasma display with plasma-shells
US7911414B1 (en) 2000-01-19 2011-03-22 Imaging Systems Technology Method for addressing a plasma display panel
US8248328B1 (en) 2007-05-10 2012-08-21 Imaging Systems Technology Plasma-shell PDP with artifact reduction
US8289233B1 (en) 2003-02-04 2012-10-16 Imaging Systems Technology Error diffusion
US8305301B1 (en) 2003-02-04 2012-11-06 Imaging Systems Technology Gamma correction

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5439972B2 (enExample) * 1972-06-30 1979-11-30
US3801862A (en) * 1972-11-06 1974-04-02 Ncr Plasma cell voltage control circuit
JPS5165825A (en) * 1974-12-04 1976-06-07 Ibm Gasuhodendeisupurei panerunotamenosasuteindenatsukyokyukairo
NL7712743A (nl) * 1976-11-30 1978-06-01 Fujitsu Ltd Stelsel voor het besturen van een gasontladings- paneel.
KR850000958B1 (ko) * 1981-02-10 1985-06-29 야마시다 도시히꼬 화상표시장치

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021607A (en) * 1973-05-19 1977-05-03 Sony Corporation Video display system employing drive pulse of variable amplitude and width
US3940755A (en) * 1973-08-22 1976-02-24 Nippon Electric Co., Ltd. Plasma display driving apparatus
US3969718A (en) * 1974-12-18 1976-07-13 Control Data Corporation Plasma panel pre-write conditioning apparatus
US4101810A (en) * 1976-05-19 1978-07-18 Owens-Illinois, Inc. System for and method of operating gas discharge display and memory
US4104563A (en) * 1976-12-30 1978-08-01 International Business Machines Corporation Writing and erasing in AC plasma displays
US7619591B1 (en) 1999-04-26 2009-11-17 Imaging Systems Technology Addressing and sustaining of plasma display with plasma-shells
US6985125B2 (en) 1999-04-26 2006-01-10 Imaging Systems Technology, Inc. Addressing of AC plasma display
US7595774B1 (en) 1999-04-26 2009-09-29 Imaging Systems Technology Simultaneous address and sustain of plasma-shell display
US7589697B1 (en) 1999-04-26 2009-09-15 Imaging Systems Technology Addressing of AC plasma display
US7456808B1 (en) 1999-04-26 2008-11-25 Imaging Systems Technology Images on a display
US7911414B1 (en) 2000-01-19 2011-03-22 Imaging Systems Technology Method for addressing a plasma display panel
US7176628B1 (en) 2002-05-21 2007-02-13 Imaging Systems Technology Positive column tubular PDP
US7157854B1 (en) 2002-05-21 2007-01-02 Imaging Systems Technology Tubular PDP
US7122961B1 (en) 2002-05-21 2006-10-17 Imaging Systems Technology Positive column tubular PDP
US7286103B2 (en) * 2002-11-26 2007-10-23 Samsung Sdi Co., Ltd. Method and apparatus for driving panel by performing mixed address period and sustain period
US20050068269A2 (en) * 2002-11-26 2005-03-31 Samsung Sdi Co, Ltd Method and apparatus for driving panel by performing mixed address method
US20040100425A1 (en) * 2002-11-26 2004-05-27 Kang Kyoung-Ho Method and apparatus for driving panel by performing mixed address period and sustain period
US8289233B1 (en) 2003-02-04 2012-10-16 Imaging Systems Technology Error diffusion
US8305301B1 (en) 2003-02-04 2012-11-06 Imaging Systems Technology Gamma correction
EP1727118A3 (en) * 2005-05-23 2007-02-21 Lg Electronics Inc. Plasma display driving apparatus and driving method
EP1727118A2 (en) 2005-05-23 2006-11-29 Lg Electronics Inc. Plasma display driving apparatus and driving method
US20060262040A1 (en) * 2005-05-23 2006-11-23 Lg Electronics Inc. Plasma display driving apparatus and driving method
EP1801768A1 (en) 2005-12-22 2007-06-27 Imaging Systems Technology, Inc. SAS Addressing of surface discharge AC plasma display
US8248328B1 (en) 2007-05-10 2012-08-21 Imaging Systems Technology Plasma-shell PDP with artifact reduction

Also Published As

Publication number Publication date
GB1399132A (en) 1975-06-25
DE2221202B2 (de) 1978-08-24
JPS5840190B1 (enExample) 1983-09-03
FR2135582A1 (enExample) 1972-12-22
GB1399131A (en) 1975-06-25
CA957044A (en) 1974-10-29
IT960270B (it) 1973-11-20
DE2221202A1 (de) 1972-11-16
GB1399133A (en) 1975-06-25
FR2135582B1 (enExample) 1973-07-13

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