US3588596A - Two-color matrix-type display panel - Google Patents

Two-color matrix-type display panel Download PDF

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Publication number
US3588596A
US3588596A US772786A US3588596DA US3588596A US 3588596 A US3588596 A US 3588596A US 772786 A US772786 A US 772786A US 3588596D A US3588596D A US 3588596DA US 3588596 A US3588596 A US 3588596A
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Prior art keywords
gas
conductors
pulses
axis
chamber
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Expired - Lifetime
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US772786A
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English (en)
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Donald D Tech
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International Business Machines Corp
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International Business Machines Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
    • H01J17/492—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes

Definitions

  • the invention relates to gaseous display and memory apparatus and more particularly, to apparatus utilizing a pulsing type gaseous discharge chamber.
  • First conductors are provided in an X-axis common to the two gas chambers.
  • Conductors in a first and second Yaxis are provided on opposite sides of each of the gas chambers and orthogonal to the X-axis. All sets of conductors are external to the gas chambers, or within the chambers and electrically insulated from the gas.
  • the first Y- axis conductors are energized by pulses ofa first polarity and phase, and the second Y-axis conductors are energized by pulses of an opposite polarity but the same phase.
  • the gas in one of the chambers is caused to discharge by applying control pulses in phase with the first or second pulses and of an amplitude sufficient to cause the gas at the intersection of the conductors to fire. If the control pulses are of one polarity, the voltage sum across the first chamber is sufficient to cause the gas in the first chamber to ionize. Pulses of the opposite polarity cause the gas in the other chamber to ionize.
  • FIG. 1 is an exploded diagram of a display panel constructed in accordance with the invention.
  • FIG. 2 is a voltage waveform of voltages appearing on the X- and Y-axes control.
  • FIG. 3 is a cross-sectional view of the display panel shown in FIG. 1.
  • FIG. 1 an exploded view of a gaseous display panel is shown.
  • the panel itself is comprised of gas chambers of either a single cell, or a great number of isolated cells, and conductors isolated from the gas chambers by means of insulators.
  • the Yl-axis conductors are comprised of conductive strips placed on insulator 12.
  • a gas chamber 14 is sandwiched between the insulator l2 and another insulator 16 forming the upper and lower walls of the gas chamber, respectively.
  • X-axis conductors 18 are comprised of conductive strips placed on an insulator 20, orthogonal to the Yl-axis, and are sandwiched between the insulator 16 and the insulator 20.
  • a second gas chamber 22 is located between the insulator and another insulator 24 which form the upper and lower walls of the gas chamber 22.
  • Y2-axis conductors 26 are placed on the insulator 24 external to the gas chamber 22 and orthogonal to the X-axis conductors 18.
  • the gas chamber 14 is filled with a homogeneous gas medium which, when ionized, emits a dominant first color.
  • the gas chamber 22 is filled with a homogeneous gas medium which, when ionized, emits a dominant second color.
  • the gas filling the chambers may be any gas or gas mixture which produces a sufficient discharge such as to cause a rapid flow of charges to the walls of the gas chambers 14 and 22.
  • the conductors l0, l8, and 26 are located on opposite sides of the gas chambers and external to the gas itself so that only the gas at the intersection ofenergized conductors will fire. Discrete wall charges are formed, in accordance with the teachings of the above identified Bitzer et al. publication, on the nonconductive chamber walls adjacent to each of the energized conductors.
  • the X- and Yl-, Y2-axes conductors are energized in the following manner.
  • Ari oscillator 30 is provided which drives Yl-axis control 32 and X-axis control 34.
  • the output of the oscillator 30 is shifted l by phase shifter 36, the output of which drives YZ-axis control 40.
  • One-half of the voltage required to fire the gas in the chamber 14 is supplied to the Yl-axis conductors 10 by the control 32 in accordance with the waveform A shown in FIG. 2.
  • Identical signals, but of opposite polarity, are applied to the Y2-axis conductors 26 as illustrated in waveform C.
  • the X-axis control 34 in conjunction with switching and selection controls 42, provides for applying voltage pulses to the X-axis conductors 18 in phase with and either of the same polarity or of opposite polarity to the respective pulses constantly supplied to the Yl-axis and the YZ-axis conductors l0 and 26.
  • the firing voltage V,- is reached if the X-axis pulses are of opposite polarity to the Y2-axis pulses, thus forming at the intersection of the selected X- and Y2-axis conductors a voltage of amplitude sufficient to fire the gas of chamber 22 at the intersection and therefore, cause the gas to glow emitting a color of dominant wavelength A 2.
  • the gas in chamber 14 is caused to glow, when voltage V, is reached, giving off a color of dominant wavelength A I, by applying pulses to the X-axis which are of opposite polarity to the pulses occurring on the Yl-axis.
  • the voltages applied to the Yl-axis may be greater than, equal to, or less than the voltages on the YZ-axis, depending upon the amplitude of V necessary to fire the gas in chamber 14.
  • the amplitude of the output signal at each line 10, 26 is set to one of three levels by switches that are in turn controlled by switching and selection control 42.
  • the signals on all lines are at the intermediate voltage level so that the combined signals cross the chambers 14, 22 are all in the sustaining range and the pattern on the display remains unchanged.
  • the signal on each of two intersecting conductors for example, the Yl-axis and the X-axis, are raised to the highest level, the combined voltage across the gas chamber 14 at the intersection exceeds the firing voltage V and ionization occurs at the intersection.
  • FIG. 3 A cross section of the gas panel of FIG. I is illustrated in FIG. 3.
  • the conductive strips l0, l8 and 26 are 10 mils wide, spaced 40 mils apart center-to-center.
  • the insulating layers 12, 16, 20 and 24 are 3 mils thick, forming gas chambers which are 10 mils thick. These dimensions are given for illustration only, and the invention is not limited thereto. Any suitable dimensions can be used, taking into account the type of gas or gas mixture used, the rate at which the discharge is developed, and the pressure of the gas.
  • the dimensions of the gas chamber should be chosen so that the energization of conductors lit) and 26 will not interact so as to cause an undesired discharge ofthe gases in the chambers M and 22.
  • a gaseous discharge display panel comprising:
  • first conductor at said first chamber and a second conductor at said second chamber, said first and second conductors orthogonal to said common conductor and electrically insulated from the gases in said chambers;
  • first gas chamber is filled with a homogeneous first gas medium which, when ionized, emits a first color
  • said second gas chamber is filled with a homogeneous second gas medium which, when ionized, emits a second color
  • said means for energizing said first conductor includes means for applying to said first conductor first voltage pulses of a fraction of the voltage required to ionize the gas in said first gas chamber;
  • said means for energizing said second conductor includes means for applying to said second conductor second voltage pulses in phase with and of a polarity opposite to said polarity of said first voltage pulses and of a fraction of the voltage required to ionize the gas in said second chamber;
  • said means for energizing said common conductor includes means for applying third voltage pulses to said common conductor in phase with and of a polarity opposite to the polarity of the pulses applied to said first or said second conductors and of sufficient amplitude when added to said first or second voltage pulses to form at the intersection of said conductors a voltage of amplitude sufficient to ionize the gas of said first and second chamber at the intersection of said energized conductors to thereby cause the gas in said first or second chambers to ionize.
  • a gaseous discharge display panel comprising:
  • Yll-axis conductors comprised of conductive strips placed on said first insulating layer
  • X-axis conductors comprised of conductive strips orthogonal to said Yl-mtls conductors and sandwiched between said second and third inmilutlng layers.
  • YZ-axis conductors comprised of conductive strips placed 5 on said fourth insulating layer orthogonal to said X-axis conductors.
  • control means for applying third voltage pulses in phase with said first and second voltage pulses to at least one of said X-axis conductors of opposite polarity to the polarity of either the pulses applied to said Yllor said YZ-axes conductors and of sufficient amplitude when added to said first or second voltage pulses to form at the intersection of said X- and Ylor YZ-axes conductors a voltage of amplitude sufficient to ionize the gas of said first or second chambers at the intersection of said energized conductors to thereby cause the gas in said chamber to ionize.
  • the combination according to claim 7 including means for varying the amplitude of the voltages applied to said Y1- and YZ-axes conductors to thereby sustain or not sustain the ionization at the intersection of said conductors.
  • a gaseous discharge display panel comprising:
  • a first gas chamber enclosing a gas which, when ionized
  • a second gas chamber enclosing a gas which, when ionized
  • control means for applying third voltage pulses to said first common conductor of opposite polarity to the polarity of, in phase with and the pulses applied to said second or said third conductor and of sufi'icient amplitude when added to said first or second voltage pulses to form at the intersection of said first and second or third conductors a voltage of amplitude sufficient to ionize the gas of said first or second chamber at the intersection of said energized conductors to thereby cause the gas in said chamber to ionize.

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  • Gas-Filled Discharge Tubes (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
US772786A 1968-11-01 1968-11-01 Two-color matrix-type display panel Expired - Lifetime US3588596A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77278668A 1968-11-01 1968-11-01

Publications (1)

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US3588596A true US3588596A (en) 1971-06-28

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US772786A Expired - Lifetime US3588596A (en) 1968-11-01 1968-11-01 Two-color matrix-type display panel

Country Status (7)

Country Link
US (1) US3588596A (enrdf_load_stackoverflow)
CH (1) CH489854A (enrdf_load_stackoverflow)
DE (1) DE1953483C3 (enrdf_load_stackoverflow)
FR (1) FR2022341A1 (enrdf_load_stackoverflow)
GB (1) GB1232127A (enrdf_load_stackoverflow)
NL (1) NL6915914A (enrdf_load_stackoverflow)
SE (1) SE394222B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859553A (en) * 1973-09-26 1975-01-07 Ibm Hexagonal display array having close-packed cells
US3869644A (en) * 1972-08-22 1975-03-04 Nippon Electric Co Pulses of the same or an opposite polarity to electrodes of a plasma display panel
US4719385A (en) * 1985-04-26 1988-01-12 Barrow William A Multi-colored thin-film electroluminescent display

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869644A (en) * 1972-08-22 1975-03-04 Nippon Electric Co Pulses of the same or an opposite polarity to electrodes of a plasma display panel
US3859553A (en) * 1973-09-26 1975-01-07 Ibm Hexagonal display array having close-packed cells
US4719385A (en) * 1985-04-26 1988-01-12 Barrow William A Multi-colored thin-film electroluminescent display

Also Published As

Publication number Publication date
FR2022341A1 (enrdf_load_stackoverflow) 1970-07-31
CH489854A (de) 1970-04-30
GB1232127A (enrdf_load_stackoverflow) 1971-05-19
DE1953483A1 (de) 1970-05-21
NL6915914A (enrdf_load_stackoverflow) 1970-05-06
SE394222B (sv) 1977-06-13
DE1953483C3 (de) 1979-10-11
DE1953483B2 (de) 1979-02-08

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