US3757160A - Gaseous discharge tube control system - Google Patents

Gaseous discharge tube control system Download PDF

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Publication number
US3757160A
US3757160A US00256373A US3757160DA US3757160A US 3757160 A US3757160 A US 3757160A US 00256373 A US00256373 A US 00256373A US 3757160D A US3757160D A US 3757160DA US 3757160 A US3757160 A US 3757160A
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United States
Prior art keywords
voltage
gaseous
discharge tube
discharge
electrode
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Expired - Lifetime
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US00256373A
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English (en)
Inventor
T Inoue
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Ricoh Co Ltd
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Ricoh Co Ltd
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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
    • G09G3/282—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 DC panels
    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/10—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using gas tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/088—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements using a non-linear two-terminal element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0275—Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display

Definitions

  • ABSTRACT [30] Foreign Application Priority Data A control system for gaseous-discharge tubes which op- June 5, 1971 Japan 46/39552 erates p the yst r sis ha acteristic of a gaseousdischarge tube.
  • a voltage V is normally applied to one [52] US, Cl 315/169 TV, 315/166, 315/169 R electrode of the gaseous-discharge tube, whereas two 315/172 voltages V and V are applied to the other electrode [51] Int. Cl.
  • the present invention relates to a control system for gaseous-discharge tubes, and more particularly an ON- OFF control system for an array of gaseous-discharge tubes such as neon glow lamps used as a display device for an electronic computer, an analyzer or the like.
  • display devices for representing the processed data for immediate use.
  • Various display elements such as gaseous-discharge tubes, photodiodes, liquid crystal, EL (electric luminescence) elements, cathode ray tubes and the like are widely used, but the gaseous-discharge tubes such as neon glow lamps find a wide application because their operation is stable and dependable and the cost is low.
  • a gaseous-discharge tube is fired or turned on at a starting voltage different from a voltage at which the gaseous-discharge tube is extinguished or turned off.
  • the starting voltage or turn-on voltage V is higher than the turn-off voltage V,,. Therefore, when a pulse voltage which is higher than the difference between the starting voltage V, and a bias voltage V intermediate the voltages V,, and V, normally impressed to a gaseous-discharge tube is impressed or superposed upon the bias voltage V, the gaseous-discharge tube is immediately turned on, and remains turned on even after the pulse voltage has disappeared.
  • a negative pulse voltage which is less than the difference between the bias voltage V and the tum-off voltage V, may be applied only for a very short time.
  • gaseous-discharge tubes such as neon glow lamps are arrayed in rows and columns.
  • a control system which works on the hysteresis characteristic of the gaseous-discharge tubes used for statically controlling the ON-OFF controls of selected gaseous-discharge tubes.
  • each of the gaseousdischarge tubes arrayed in rows and columns is impressed with a bias voltage V,.
  • the driving pulses are impressed or superimposed on the bias boltage V, of a selected gaseous-discharge tube through a row and column driving circuits external of the array of gaseous-discharge tubes so that the sum of the bias voltage V, and the pulse voltages may be over the starting or tum-on voltage V,.
  • the selected gaseousdischarge tube is turned on, and remains turned on even after the pulse voltages have disappeared.
  • each gaseous-discharge tube is provided with an AND circuit which outputs the signal only when the row and column driving pulse voltages are simultaneously applied so that in response to the output signal from the AND gate, only the selected gaseous-discharge tube may be turned on.
  • Another object of the present invention is to provide a control system for an array of gaseous-discharge tubes in which each gaseous-discharge tube is provided with a special AND circuit designed in accordance with the present invention so that a reduction in the number of circuit component parts may be attained.
  • one electrode of the gaseous-discharge tube is connected to a first power source, whereas the other electrode is grounded through a series circuit comprising a current limiting resistor and a first resistor.
  • the junction between the current limiting resistor and the first transistor is connected to a second power source, and the junction between the other electrode of the gaseous-discharge tube and the current limiting resistor is connected through a diode to a third power source which in turn is grounded through a second transistor.
  • the voltage impressed to the gaseous-discharge tube rises to the voltage of the first power source so that the gaseousdischarge tube is turned on. Once the gaseousdischarge tube is turned on, it remains turned on even fter the first and second transistors are both cut off.
  • FIG. 1 is a graph of the voltage-current characteristic curve of a gaseous-discharge tube for explanation of the hysteresis characteristic thereof;
  • FIG. 2 is a circuit diagram of one prior art ON-OFF control system for gaseous-discharge tubes
  • FIG. 3 is a circuit diagram used for explanation of the underlying principle of the present invention.
  • FIG. 4 is a circuit diagram of a control system for an array of gaseous-discharge tubes in accordance with the present invention.
  • FIG. 1 shows the voltage-current characteristic curve of a typical gaseous-discharge tube (to be referred to as a discharge tube" for brevity in this specification).
  • the voltage applied to the discharge tube is plotted along the abscissa whereas the current flows through the discharge tube along the ordinate. It is seen that the starting voltage or tum-on voltage V, is different from the tum-off voltage V,,. That is V, V,,.
  • the bias voltage V intermediate the tum-on and turn-off voltages V, and V
  • the latter will be immediately turned on when a pulse voltage which is equal to the difference between the starting voltage V and the bias voltage V is superposed upon the bias voltage V ONce the discharge tube is turned on, it remains glowing even if the pulse voltage is removed.
  • the negative pulse voltage which equals the difference between the bias voltage V and the tum-off voltage V, is impressed, the discharge tube may be immediately turned off.
  • one or any number of plurality of discharge tubes may be selectively turned on or turned off.
  • the display device is shown as comprising a 2 X 2 array of the discharge tubes T T T and T but it should be understood that in practice a large number of discharge tubes are used.
  • One electrode of the discharge tube T is connected to a first d-c power source V whereas the other electrode is grounded through a current limiting resistor R and a transistor Tr
  • the junction between the current limiting resistor R and the transistor Tr is connected through a resistor to a second d-c power source V
  • To the base of the transistor Tr is connected an AND circuit comprising diodes D D and D
  • To thejunction a between the diodes D and D is impressed through a resistor a positive voltage V
  • the instantaneous positive pulse signals P and Q are applied to the diodes D and D
  • Other discharge tubes T T and T are connected in a similar manner to that described above.
  • the voltage V of the first d-c power source is the starting or turnon voltage V and the difference between the voltages V and V of the first and second d-c power sources is the bias voltage V
  • V V is impressed to the discharge tube T so that the latter remains turned off.
  • the pulse signal P, or Q is applied to the diode D or D the potential at the junction a is still zero so that the transistor Tr still remains cut off.
  • the discharge lamp T still remains turned off.
  • each discharge tube unit requires three diodes and one transistor so that the circuitry becomes complex in con struction and expensive in cost with the increased number of circuit component parts.
  • One electrode of the discharge tube T is connected to the power source with the voltage V whereas the other electrode, that is the junction 0 is grounded through a current limiting resistor R and a transistor Tr,
  • the junction d between the resistor R and the transistor Tr is applied with the voltage V through a resistor R and the junction 0 between the discharge tube T and the resistor R is applied with the voltage V; through a diode D and a resistor R the junction e between which is grounded through a transistor Tr
  • To the bases of the transistors Tr and Tr, are applied the instantaneous pulse signals P and Q, respectively so that the transistors Tr and Tr: are conducted or ON.
  • the magnitudes of the voltages V V and V are so selected as to satisfy the following condition:
  • the potential at the junction c equals the voltage V: so that the voltage (V, V,) is impressed to the discharge tube T.
  • the discharge tube T remains turned off.
  • the transistor Tr is conducting whereas the transistor Tr, is cut off, the potential at the junction e lowers to the earth potential, but the potential at the junction 0 remains at the level of the voltage V, because the current which flows from the power source V, through the resistor R and R,,, to the junction e is interrupted by the diode D. As a result, the discharge tube T remains turned off.
  • the potential at the junction d is at the earth potential so that the current from the power source with the voltage V, flows into the transistor Tr, through the resistor R the diode D and the resistor R,,,.
  • the potential at the junction 0 is given by Eq. (3), and the voltage equal to V, R,,,/(R,,, R, R,,,) V, is impressed to the discharge tube T.
  • the current limiting resistor R,, is relatively very high so that R,,, R,,,,, R,
  • the voltage impressed to the discharge tube T is slightly higher than the voltage V, V,,) so that the discharge tube T remains turned off.
  • the discharge tube T is turned on. However, when only one of the signal pulses P and Q is applied, the discharge tube T will not turn on.
  • the embodiment of the prsent invention is shown as comprising a 2 X 2 array of discharge tubes T,,, T,,, T,, and T,,, but it should be understood that in practice a large number of discharge tubes are arrayed. Since the circuit arrangements of the four discharge tube units are substantially similar it will suffice to describe only one unit T,,.
  • the voltage V, is impressed to one electrode of the discharge tube T,,, and the other electrode is grounded through the resistor R,, and the transistor Tr,,.
  • the voltage V, is impressed through the resistor R, and the diode D,, to one end of the resistor R,,, and the voltage V,, is impressed through the resistor R, to the other end of the resistor R,,.
  • the junction between the resistor R, and the diode D, is grounded through the transistor Tr,,.
  • the transistor Tr is common to the discharge tubes T,, and T,
  • the transistor Tr,,, common to the discharge tubes T,, and T are common to the transistor Tr, and T, and the transistor Tr,, common to the discharge tubes T,, and T,,. That is, only one transistor is provided for the discharge tubes in each row and column, and only one diode D is provided for each discharge tube.
  • the voltages and circuit component parts shown in FIG. 4 correspond to those shown in FIG. 3 in the following manner. That is, the voltage V,,, V,, and V,, correspond to the voltage V,, V, and V,, respectively;
  • the voltages V,,, V,, and V, are selected .to satisfy the relations described with reference to FIG. 3.
  • a control system for a gaseous-discharge tube comprising a. a gaseous-discharte tube having two electrodes b. means for impressing a voltage V, to one electrode of said gaseous-discharge tube,
  • a control system for an array of a plurality of gaseous-discharge tubes comprising a. a plurality of gaseous-discharge tubes arrayed in rows and columns, b. means for impressing a voltage V, to one electrode of each of said plurality of gaseous-discharge tubes, c. means for impressing a voltage V, to the other electrode of each gaseous-discharge tube through a resistor,
  • V e means for grounding all points in one row at which Vl V y Va Vb said voltage V, is applied only when a row driving pulse is applied to said one row, and
  • V tum-Off voltage means for grounding all points in one column at where which said voltage V is applied only when a 001- I: Stamng tum-011 g and umn driving pulse is applied to said one column, V tum-Off voltage.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Amplifiers (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
US00256373A 1971-06-05 1972-05-24 Gaseous discharge tube control system Expired - Lifetime US3757160A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46039552A JPS529100B1 (fr) 1971-06-05 1971-06-05

Publications (1)

Publication Number Publication Date
US3757160A true US3757160A (en) 1973-09-04

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Application Number Title Priority Date Filing Date
US00256373A Expired - Lifetime US3757160A (en) 1971-06-05 1972-05-24 Gaseous discharge tube control system

Country Status (4)

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US (1) US3757160A (fr)
JP (1) JPS529100B1 (fr)
DE (1) DE2227251A1 (fr)
FR (1) FR2140442A1 (fr)

Also Published As

Publication number Publication date
JPS529100B1 (fr) 1977-03-14
FR2140442A1 (fr) 1973-01-19
DE2227251A1 (de) 1972-12-14

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