GB1381167A - Supply circuit for a gas discharge character display tube - Google Patents

Supply circuit for a gas discharge character display tube

Info

Publication number
GB1381167A
GB1381167A GB362572A GB362572A GB1381167A GB 1381167 A GB1381167 A GB 1381167A GB 362572 A GB362572 A GB 362572A GB 362572 A GB362572 A GB 362572A GB 1381167 A GB1381167 A GB 1381167A
Authority
GB
United Kingdom
Prior art keywords
cathodes
characters
gas discharge
anodes
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB362572A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1381167A publication Critical patent/GB1381167A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers
    • H03K21/08—Output circuits

Abstract

1381167 Automatic current control PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 26 Jan 1972 [29 Jan 1971] 3625/72 Heading G3R [Also in Division H2] A gas discharge tube used for display of characters comprises at least one anode and a plurality of cathodes in the form of characters, at least one of the cathodes being arranged to luminesce for all the characters to be displayed the circuit of which cathode comprises a resistor across which a control voltage is developed and which serves as the input signal to a constant current source whereby the current flowing in the resistor, and hence the cathode circuit is maintained constant. A gas discharge tube 1 comprises three anodes 3, 5, 7 each anode being associated with four cathodes 9-15, the corresponding cathodes being connected in parallel and each group having a resistor 27 or 29 or 31 or 33 connected in series therewith. The supply for the anodes 3, 5, 7 is derived from a constant current source 22 by way of respective transistors 17, 19, 21 control of which is effected by a so-called decoder 23. Cathodes 11, 15 are arranged to luminesce for all the characters displayed and the voltages developed across resistors 29, 33 and fed to the base of a transistor 51 in the current source 22 by way of diode gate 45, 47. The difference between the base voltage and the emitter voltage set by a Zener diode 53 determines the base and collector currents of transistor 51 and these determine the output voltage of a converter constituted by a transformer 57 and a transistor 61, the output voltage of which is rectified by a diode 63 for application to the anodes 3, 5, 7. Thus the output voltage of the source 22 is maintained constant at a value determined by the Zener diode 53 and hence the current in the cathode circuits of the tube are also kept constant. Luminescing of the cathodes 9-15 is terminated by transistors 37-43 being made conductive by way of the decoder 23.
GB362572A 1971-01-29 1972-01-26 Supply circuit for a gas discharge character display tube Expired GB1381167A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7101186A NL7101186A (en) 1971-01-29 1971-01-29

Publications (1)

Publication Number Publication Date
GB1381167A true GB1381167A (en) 1975-01-22

Family

ID=19812360

Family Applications (1)

Application Number Title Priority Date Filing Date
GB362572A Expired GB1381167A (en) 1971-01-29 1972-01-26 Supply circuit for a gas discharge character display tube

Country Status (8)

Country Link
US (1) US3794881A (en)
JP (1) JPS5316653B1 (en)
CA (1) CA953003A (en)
DE (1) DE2200637C2 (en)
FR (1) FR2124885A5 (en)
GB (1) GB1381167A (en)
IT (1) IT951107B (en)
NL (1) NL7101186A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7300217A (en) * 1973-01-08 1974-07-10
US4024429A (en) * 1975-10-06 1977-05-17 Panel Technology, Inc. Operating voltage supply system for gas discharge display panel
DE2701303C3 (en) * 1977-01-14 1983-02-17 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hydraulic gear machine
US4109180A (en) * 1977-06-23 1978-08-22 Burroughs Corporation Ac-powered display system with voltage limitation
JPS54181642U (en) * 1978-06-10 1979-12-22
US4250504A (en) * 1979-08-23 1981-02-10 General Electric Company Gas discharge display circuit
US4347509A (en) * 1980-02-27 1982-08-31 Ncr Corporation Plasma display with direct transformer drive apparatus
JPS5984193U (en) * 1982-11-30 1984-06-07 松下電工株式会社 Window airtight structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL280449A (en) * 1962-07-03
GB1132181A (en) * 1965-03-15 1968-10-30 Sony Corp Time divisional display system for computers
GB1164675A (en) * 1966-12-02 1969-09-17 Hitachi Ltd Electronic Display System
JPS4810892B1 (en) * 1968-12-23 1973-04-09
JPS4839490B1 (en) * 1969-04-03 1973-11-24

Also Published As

Publication number Publication date
DE2200637A1 (en) 1972-08-17
JPS5316653B1 (en) 1978-06-02
CA953003A (en) 1974-08-13
IT951107B (en) 1973-06-30
NL7101186A (en) 1972-08-01
DE2200637C2 (en) 1982-05-27
FR2124885A5 (en) 1972-09-22
US3794881A (en) 1974-02-26

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee