US3839657A - Method and apparatus for controlling a gas discharge display device - Google Patents

Method and apparatus for controlling a gas discharge display device Download PDF

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Publication number
US3839657A
US3839657A US00289600A US28960072A US3839657A US 3839657 A US3839657 A US 3839657A US 00289600 A US00289600 A US 00289600A US 28960072 A US28960072 A US 28960072A US 3839657 A US3839657 A US 3839657A
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voltage
sustaining
discharge
electrodes
gas discharge
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US00289600A
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English (en)
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N Nakayama
Y Shirouchi
T Urade
S Andoh
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Fujitsu Ltd
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Fujitsu Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures

Definitions

  • HOSb 41/30 ing sustain voltage is impressed to the electrodes and [58] Field of Search 315/169 TV, 169 R; writing and erasing are achieved by a voltage pen im- 340/324 R, 166 EL, 337 pressed with an AC control voltage and in which the magnitude and/or frequency of the sustain voltage is [56] References Cited altered, thereby to ensure writing and erasing.
  • This invention relates to apparatus and method for controlling a gas discharge display device of the type that writing and erasing are carried out by means of a voltage pen.
  • Neon or like discharge gas is sealed between opposed X- and Y- direction electrodes covered with dielectric layers.
  • the electrodes are supplied with a sustain voltage of about 50 KHz, and when a superimposed or single write-in pulse voltage is impressed to selected ones of the electrodes in such a manner that the peak value of the voltage at the selected electrodes may exceed a discharge voltage, a discharge spot is produced at the intersection of the selected electrodes and a wall charge is stored in the dielectric layers to provide a wall voltage.
  • the potential difference between the wall voltage and the sustain voltage applied after a half cycle exceeds the dis charge voltage to produce the discharge spot again and reverse the polarity of the wall voltage.
  • the discharge spot is continuously generated by continuous impression of the sustain voltage lower than the discharge voltage, thus enabling a memory display. lmpressing an erasing pulse voltage of small pulse width or lower amplitude than a minimum sustain voltage, the discharge spot is once produced but no wall voltage is thereby generated and no discharge spot is produced by the subsequent sustain voltage. Namely, the display can be erased.
  • Such a gas discharge display of the type that writing and erasing are achieved by an address method based on selection of the X- and Y-direction electrodes can also be used as a display device for electronic computers.
  • an address method such as one employing a light pen and a cathode tube display device be used for the display device thereof.
  • the address method using the light pen that has heretofore been proposed is such that a light spot is directed by the light pen to an address position in the gas discharge display device suppliedwith the sustain voltage to supply photoelectrons in the discharge cell, thereby achieving writing or erasing.
  • this method is difficult to address at a minute point and not easy to obtain accurate operation, and hence regarded as difficult to put to practical use.
  • an external address method employing a voltage pen has also been proposed. This method is to supply the voltage pen with a voltage of the same frequency as the sustain voltage and reverse its phase 180 thereby to control writing and erasing, for example, as explained in the 1970 IDEA Symposium Digest of Papers, pages 28 and 29.
  • This method is also inaccurate in its erasing operation, and hence is not suitable for use in those fields which require accurate writing or erasing operation.
  • This invention is directed to a method of controlling a gas discharge display device and has for its principal object to provide novel apparatus and method for controlling a gas discharge display device which is free from the aforementioned defects experienced in the prior art and ensures achievement of accurate writing and erasing operations by the use of a voltage pen.
  • Another object of this invention is to provide apparatus and method which ensures achievement of writing and erasing operations of a gas discharge display device by the use of a voltage pen which is simple in construction and easy of operation.
  • the apparatus and method of controlling the gas discharge display device is such that a sustain voltage source is pro vided with means for changing the magnitude or freqency of the sustain voltage.
  • addressing is achieved by the voltage pen with the sustain voltage or its frequency being raised; and at the time of erasing, addressing is achieved by the voltage pen with its sustain voltage or frequency being lowered.
  • superimposition of the voltage impressed by the voltage pen on the sustain voltage ensures achievement of writing operation and, at the time of erasing, since the sustain voltage or its frequency is low, even if the discharge spot is produced by the superimposition of the voltage impressed by the voltage pen on the sustain voltage, the wall voltage is thereby cancelled, thus ensuring erasing operation.
  • FIG. 1 is a block diagram showing one example of this invention
  • FIG. 2 is a cross-sectional view of the principal part of the gas discharge display device shown in FIG. 1;
  • FIG. 3 is a circuit diagram illustrating one example of the sustain voltage generator circuit shown in FIG. 1;
  • FIG. 4 is a series of waveform diagrams, for explaining the operation of the circuit depicted in FIG. 3;
  • FIG. 5 is a circuit diagram showing one example of an address source circuit
  • FIG. 6 and 7 are circuit diagrams illustrating examples of an address circuit respectively
  • FIG. 8 is a waveform diagram of a sustain voltage
  • FIG. 9 is a diagram, for explaining the write-in operation by a voltage pen
  • FIGS. 10A and 10B are circuit diagrams showing ex amples of a converter circuit
  • FIG. 11 is a diagram, for explaining the erasing operation by the voltage pen.
  • FIG. 12 is a diagram, for explaining the relationship between a wall voltage and the sustain voltage.
  • FIG. 13 is a diagram, for explaining the erasing operation in the case where the frequency of the sustain voltage is lowered.
  • FIG. 1 shows in block form one example of this invention.
  • reference numeral 10 indicates a gas discharge display device having X- and Y- direction electrodes; 11 a sustain voltage generator circuit; 12 a frequency or voltage converter circuit; 13 a control voltage source; 14 a voltage pen for addressing use; 15 and 16 address circuits; 17 an address power source and 18 a key board and reference character S 3 designates a changeover switch disposable from a first position a to a second posiion b.
  • FIG. 2 illustrates in section the principal part of the gas discharge display device 10,
  • X- and Y-direction electrodes 3 and 4 are mounted on the interior surfaces of opposed glass base plates 1 and 2 in such a manner as to be perpendicular to each other.
  • the electrodes 3 and 4 are covered with dielectric layers 5 and 6 of low-melting-point glass, and a mixed discharge gas, composed of for example Ne 95 percent and N 5 percent, is sealed within the space 7 defined between the opposing dielectric layers 5 and 6.
  • FIG. 3 schematically shows the internal construction of one example of the sustain voltage generator circuit 1 1 (FIG. 1).
  • a clock pulse from a clock pulse generator 111 is counted by a scale-of-twelve counter 112.
  • the count contents 1 and 7 of the counter 112 are applied by a sustain voltage timing generator circuit 113 to the bases of transistors Q1 and 02.
  • FIG. 4 shows a series of waveform diagrams, for explaining the operation of the sustain voltage generator circuit, in which a shows a clock pulse; b to f the count contents of the counter 112, g the output of the transistor Q1, that is a voltage at a terminal 114; h the output of the transistor Q2, that is a voltage at a terminal 115; and i a write-in timing pulse which is obtained by applying the count content of the counter 112 to the address power source 17 from a terminal 116 and to corresponding terminal 175 as will be seen in FIG. 5. Further, terminals 117 and 118 are connected to the converter circuit 12.
  • FIG. 5 illustrates the internal construction of one example of the address power source 17, in which the terminal 116 in FIG. 3 is connected to a terminal 175.
  • a write-in timing pulse generator circuit 171 produces the timing pulse shown in FIG. 4i, which is applied to AND circuits 173 and 174.
  • a terminal 180 is connected to the key board 18, the output of which is fed to the AND circuits 173 and 174 and decoded by a decoder 172.
  • Terminals 176 and 177 are connected to the address circuits and 16 respectively, while terminals 178 and 179 are also connected to the address circuits 15 and 16 respectively.
  • These terminals 178 and 179 transmit the decoded contents Xl to Xn and Y! to Ym and, in practice, each of them comprises a plurality of terminals.
  • FIG. 6 shows the internal construction of one example of the address circuit 15, in which terminals 151, 152 and 153 are connected respectively to the terminal 176 of the address power source 17, the changeover switch S and the terminal 178 of the address power source 17.
  • Terminals XLl to XLn are connected to the X-direction electrodes of the gas discharge display device 10 and the sustain voltage divided from the sustain voltage generator circuit 11 is supplied through the changeover switch S to the terminal 152, from which it is impressed to the electrodes through diodes DX2I to DX2n.
  • a transistor O3 is turned on to open AND circuits AXl to AXn in response to the decoded contents, so that a voltage Vs is impressed through diodes DXll to DXln to a selected one of the X-direction electrodes of the gas discharge display device 10.
  • FIG. 7 shows the internal construction of one example of the address circuit 16, in which terminals 161, 162 and 163 are connected to the terminal 177 of the address power source 17, the changeover switch S and the terminal 179 of the address power source 17.
  • Terminals YLl to YLm are connected to the Y-direction electrodes of the gas discharge display device 10.
  • a transistor Q4, diodes DYll to DY1m and DYZI to DY2m and AND circuits AYl to AYm are similar to those in the address circuit 15 described above but since the write-in voltage is -(V V the transistor Q4 and the diodes DYll to DY1m are opposite in conducting direction to those above mentioned.
  • the changeover switch S is held in position a and the sustain voltage derived from the sustain voltage generator circuit 11 is impressed to the X- and Y- direction electrodes of the gas discharge display device 10 through the address circuits 15 and 16 respectively.
  • the sustain voltage is impressed upon the electrodes through the diodes DX2l to DX2n (FIG. 6) and DYZl to DY2n (FIG. 7) at such timing as depicted in FIGS. 43 and 4h and a pulse voltage which becomes alternately positive and negative is applied between the opposing electrodes.
  • the AND circuits 173 and 174 are opened at such timing as shown in FIG. 41' and the AND circuits AXl to AXn (see FIG. 6) of the address circuits l5 and 16 are opened in response to the decoded contents of the decoder 172, by which the voltages V and -(V V are impressed to selected ones of the X- and Y-direction electrodes and a firing voltage V is impressed to the thus selected cell at the intersection of the selected X- and Y-direction electrodes, thus achieving the writing operation.
  • the pulse width of the voltage impressed to the selected cell is decreased, for example, by reducing the pulse widths of the timing pulses appearing at the terminal 176 and 177 of the address power source 17 based on an instruction from the key board 18. In such a case, discharge is once achieved but no wall voltage is produced and no discharge is caused even by the subsequent impression of the sustain voltage, thus erasing the display.
  • FIG. 8 shows one example of the waveform of this sustain voltage, in which reference character V indicates a discharge voltage, V the sustain voltage, V a minimum sustain voltage and V a wall voltage of the cell in which a discharge spot is being produced.
  • the condition in which such a sustain voltage is impressed will hereinafter be referred to as a first condition having a large memory factor (which is a factor representing the amount of the wall voltage generated and is dependent upon the frequency, the pulse width and the rise time of the sustain voltage in addition to components of the cell).
  • the waveform of the sustain voltage can be made a desired one other than that depicted in FIG. 8.
  • the sustain voltage V is preferred to be set at a value as close to the firing voltage V as possible, that is, at a maximum sustain voltage V
  • the sustain voltage V may also be selected at an ordinary value.
  • FIG. 9 illustrates a waveform which is produced when the writing operation is achieved by a voltage comprising the voltage V of the voltage pen 14 is superimposed upon the sustain voltage V At a time when the superimposed voltage exceeds the firing voltage V a discharge spot is produced and the writing operation is carried out.
  • the changeover switch S is turned to position b and the voltage or frequency of the sustain voltage derived from the sustain voltage generator circuit 11 is lowered in the converter circuit 12, whose output is impressed upon the X- and Y-direction electrodes of the gas discharge display device 10.
  • This condition is a second condition with a small memory factor.
  • the sustain voltage for providing the second condition is selected at a value close to the minimum sustain voltage v or its frequency is lowered.
  • the limit of the frequency is different according to the characteristic of the gqs discharge display device 10, and hence is difficult to express quantitatively but qualitatively it is the lowest frequency at which continuous generation of the discharge spot is possible.
  • the memory factor represents the quantity of wall charge and exhibits a mountainshaped characteristic. At frequencies higher than an optimum frequency, polarity inversion of the sustain voltage takes places at a speed higher than the migration speed of charged particles to cause a decrease in the wall voltage; while at frequencies lower than the optimum frequency, the discharge intervals become longer and wall charge is neutralized and extinguished until the subsequent discharge.
  • FIG. 10 illustrates the internal construction of the voltage converter circuit, in which terminals 121 and 122 are connected to those 117 and 118 of the sustain voltage generator circuit 11 respectively, and terminals 123 and 124 are connected to those 152 and 162 of the address circuits 15 and 16 respectivelyn
  • the minimum sustain voltage V is impressed to the X- and Y-direction electrodes of the gas discharge display device 10. Namely, a minimum voltage for maintaining the discharge spot being generated is impressed to the electrodes of the gas discharge display device 10 and a voltage is applied by the voltage pen 14 to an addressed position.
  • the wall voltage V is at a certain level, for example, as shown in FIG. 12, impression of the maximum sustain voltage V causes the wall voltage V to approach a certain higher level, so that a discharge spot can be continuously produced by its weak discharge.
  • impression of the minimum sustain voltage V causes the wall voltage V to be converged close to zero level and the discharge spot becomes extinguished.
  • the maximum sustain voltage V is about 150V and the minimum sustain voltage V is about 140V, and an increase in the difference there between further ensures writing and erasing operations.
  • the minimum sustain voltage V can also be produced by a suitable control in the sustain voltage generator circuit 11 and not through the provision of the voltage converter 12 and since this requires merely control of the peak value, the circuit construction therefor is relatively simple.
  • the sustain voltage is made minimum at the time of the erasing operation but the erasing operation can also be achieved by lowering its frequency.
  • the converter circuit is a frequency converter circuit, whose internal construction is depicted in FIG. 10B. Terminals 121a, 122a, 123a and 124a are connected in the same manner as those 121 to 124 in FIG. 10A. Reference numerals 125 and 126 indicate dividers, which divide the frequency of the sustain voltage output derived from the sustain voltage generator circuit 11. By the frequency divided output, transistors Q7 and Q8 are controlled to impress a sustain voltage of low frequency to the X- and Y-direction electrodes of the gas discharge display device 10.
  • control voltage fed to the voltage pen 14 causes a weak discharge in the cell and this discharge is utilized to fire and erase the main discharge but in accordance with other examples of this invention external addressing is possible with a control voltage of lower frequency.
  • the composite voltage with the control voltage V has such a complicated waveform as depicted in FIG. 13, and fine pulses E produced at random in the portion contributing to discharge, serve as erasing pulses. It is known that where a pulse of a pulse width less than a certain value (usually 3uS) is applied to the discharging portion, generation of the wall voltage can be stopped.
  • the frequency of the control voltage is 10 to ZOKHz
  • This can easily be accomplished, for example, by the combination of a simple charge and discharge circuit with the device of this invention.
  • the methods of utilizing the weak discharge and the composite voltage are both the same in that the frequency of the sustain voltage is changed.
  • it is considered that the two phenomena are added to each other in practice to achieve positive writing and erasing operations.
  • the gas discharge panel for use in this invention is such that the one base plate serving as an outer wall on the address side is as thin as possible to ensure that the voltage applied to the voltage enters the cell as effectively as possible.
  • the one base plate serving as an outer wall on the address side is as thin as possible to ensure that the voltage applied to the voltage enters the cell as effectively as possible.
  • it is considered to form lattice-like or dot-like grooves in the surface on the address side, minimize the voltage distributed to the base plate and use the grooves as a guide for the tip of the voltage pen.
  • the thickness of this base plate is related to the pitch of the X- and Y-direction electrodes and where the thickness of the base plate becomes about three times the. pitch of the electrodes, one-point address is difficult.
  • the shape of the tip of the voltage pen 14 is preferred to be bent rather than needle-shaped for the purpose of avoiding misaddress. In order to center an electric field on'the addressed portion, it would be more effective to provide a shield cover in the neighborhood of the tip of the pen. Further, since a high voltage is applied to the voltage pen, it is desired to cover its surface with an insulating film so as to avoid danger of an electric shock. Needless to say, the changeover switch S for changing over the aforementioned frequency or voltage may be mounted on the voltage pen 14. Further, it is also possible to change over the frequency and the voltage simultaneously to provide for ensured operation.
  • the present invention achieves writing and erasing by changing over the sustain voltage and/or its frequency at the time of the writing and erasing operations by the voltage pen 14.
  • the sustain voltage it is sufficient only to change its peak value, while in the case of changing over its frequency, it is sufficient only to divide it, so that the circuit construction is simple and writing and erasing can be achieved positively.
  • the gas discharge display device can be used as a display device of the type conventional with electronic computers and further can be adapted for a wide range of new uses.
  • Apparatus for controlling the writing and erasing of information upon a gas discharged display device 4 comprising an envelope for sealing an ionizable gas therein, and first and second sets of electrodes spaced from each other and defining intersecting points as to each other, establishing thereby discrete points where information may be written and erased, said apparatus comprising:
  • an addressing instrument disposable at a selected one of the discrete points of said gas discharge display device
  • source means for applying an AC control voltage of selected amplitude and frequency values to said addressing instrument whereby a corresponding AC voltage is impressed upon the selected discrete point of said gas discharge display device;
  • sustaining means for impressing a sustaining voltage of selected amplitude and frequency values between the electrodes of the first and second sets whereby the sustaining voltage is applied to each discrete display point of said gas discharge display device;
  • erasing means for varying at least one of said amplitude and frequency values of the sustaining voltage from the selected value to terminate the discharge at the discrete display point where the addressing instrument is disposed, said addressing instrument having an AC control voltage applied thereto during erasing which has at least the same said selected amplitude value as the said AC control voltage applied thereto during writing.
  • first and second addressing means respectively coupled to said first and second sets of electrodes for selectively applying an addressing signal to a selected electrode of each of said first and second sets to establish a discharge at the corresponding intersection of the said selected electrodes thereby to achieve writing on said discharge display apparatus.
  • said gas discharge display device has a maximum amplitude value of its sustaining voltage which is slightly less than its firing voltage and a minimum sustaining voltage amplitude value, said sustaining means selecting the sustaining voltage amplitude value to be essentially equal to the said maximum sustaining voltage amplitude value during writing.
  • Apparatus for controlling the writing and erasing of information upon a gas discharge display device comprising an envelope for sealing an ionizable gas therein, first and second sets of electrodes spaced from each other by the ionizable gas and intersecting each other to define discrete points where information may be written and erased, said apparatus comprising:
  • an addressing instrument disposable at a selected one of the discrete points of said gas discharge display device
  • source means for applying an AC control voltage to saidaddressing instrument whereby a corresponding AC voltage is impressed upon the selected discrete point of said gas discharge display device;
  • sustaining means for impressing a sustaining voltage of a selected level between the electrodes of the first and second sets whereby the sustaining voltage is impressed at each discrete point of said gas discharge display device;
  • erasing means for varying the sustaining voltage from the selected level to terminate the discharge across the discrete point where the addressing instrument is disposed, said erasing means including means for dividing the frequency of the sustaining voltage to be applied to the electrodes of said gas discharge display device.
  • the sustaining voltage comprises a train of bipolar pulses applied in alternating succession to said first and second sets of electrodes, and
  • the AC control voltage is sinusoidal, one half period thereof exceeding the interval of successive pulses of the bipolar pulse train.
  • the sustaining voltage comprises a train of bipolar pulses applied in alternating succession to said first and second sets of electrodes, and
  • the AC control voltage is sinusoidal, one half period thereof exceeding the interval of successive pulses of the bipolar pulse train.
  • the sustaining voltage comprises a train of bipolar pulses applied in alternating succession to said first and second sets of electrodes, and
  • the AC control voltage' is sinusoidal, one half period thereof exceeding the interval of successive pulses of the bipolar pulse train:
  • a method of controlling a gas discharge display device having an ionizable gas therein and first and second sets of electrodes disposed in spaced planes and intersecting relationship, defining therebetween a discharge region at each such intersection and thereby a corresponding, discrete display position, comprising the operations of applying a sustaining voltage to said sets of electrodes of an amplitude value selected to be sufficient to maintain a wall charge in said device in each display region at which a discharge is occuring,
  • said sustaining voltage at all times having amplitude and frequency values sufficient to produce a wall voltage for maintaining an already existing discharge, and the values thereof being selected with respect to those of the AC control voltage to produce, in the write operation, a composite voltage of sufficient amplitude and appropriate frequency for initiating a discharge and producing a resultant wall voltage thereafter maintainable by said sus taining voltage alone, for sustaining the discharge, and to result, in the erase operation, in a composite voltage which effects discharging of an existing wall voltage but which is not sufficient to maintain the wall voltage, thereby terminating the discharge 21.
  • Apparatus for controlling a gas discharge display device having an ionizable gas therein and first and second sets of electrodes disposed in spaced planes and intersecting relationship, defining therebetween a discharge display region at each such intersection and thereby a corresponding, discrete display position comprising means for applying a sustaining voltage to said sets of electrodes of an amplitude value selected to be sufficient to maintain a wall charge in said device in each display region at which a discharge is occurring,
  • said instrument being effective to write in said display device at a selected display position by positioning the instrument, with the AC control voltage applied thereto, at the selected position while the sustaining voltage is applied to said sets of electrodes,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Position Input By Displaying (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US00289600A 1971-09-18 1972-09-18 Method and apparatus for controlling a gas discharge display device Expired - Lifetime US3839657A (en)

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JP7286171A JPS5314893B2 (de) 1971-09-18 1971-09-18

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US (1) US3839657A (de)
JP (1) JPS5314893B2 (de)
DE (1) DE2245188C3 (de)
GB (1) GB1403430A (de)
NL (1) NL174678C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017762A (en) * 1974-12-04 1977-04-12 Ibm Corporation Voltage controlled sustain frequency in a gas display panel
US5907311A (en) * 1994-06-24 1999-05-25 Sony Corporation Electrode structure for plasma chamber of plasma addressed display device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337902A (en) * 1976-09-20 1978-04-07 Oil Drive Kogyo Ltd Method of switching over suctionndelivery cylinders
JPH0232871Y2 (de) * 1984-11-16 1990-09-05

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3559307A (en) * 1969-05-26 1971-02-02 Ibm Stylus actuated gas discharge system
US3573542A (en) * 1968-03-28 1971-04-06 Control Data Corp Gaseous display control
US3651509A (en) * 1970-11-06 1972-03-21 Bell Telephone Labor Inc Light pen for display having inherent memory
US3689912A (en) * 1970-12-16 1972-09-05 Bell Telephone Labor Inc Gaseous display driver circuits
US3727102A (en) * 1970-08-03 1973-04-10 Owens Illinois Inc Selection and addressing circuitry for matrix type gas display panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573542A (en) * 1968-03-28 1971-04-06 Control Data Corp Gaseous display control
US3559307A (en) * 1969-05-26 1971-02-02 Ibm Stylus actuated gas discharge system
US3727102A (en) * 1970-08-03 1973-04-10 Owens Illinois Inc Selection and addressing circuitry for matrix type gas display panel
US3651509A (en) * 1970-11-06 1972-03-21 Bell Telephone Labor Inc Light pen for display having inherent memory
US3689912A (en) * 1970-12-16 1972-09-05 Bell Telephone Labor Inc Gaseous display driver circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017762A (en) * 1974-12-04 1977-04-12 Ibm Corporation Voltage controlled sustain frequency in a gas display panel
US5907311A (en) * 1994-06-24 1999-05-25 Sony Corporation Electrode structure for plasma chamber of plasma addressed display device

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DE2245188A1 (de) 1973-03-29
GB1403430A (en) 1975-08-28
JPS4838671A (de) 1973-06-07
DE2245188C3 (de) 1978-07-27
NL174678B (nl) 1984-02-16
DE2245188B2 (de) 1977-12-01
NL7212563A (de) 1973-03-20
JPS5314893B2 (de) 1978-05-20
NL174678C (nl) 1984-07-16

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