US3801864A - Display device - Google Patents

Display device Download PDF

Info

Publication number
US3801864A
US3801864A US00332545A US3801864DA US3801864A US 3801864 A US3801864 A US 3801864A US 00332545 A US00332545 A US 00332545A US 3801864D A US3801864D A US 3801864DA US 3801864 A US3801864 A US 3801864A
Authority
US
United States
Prior art keywords
discharge
control
space
control grids
accelerating
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 - Lifetime
Application number
US00332545A
Other languages
English (en)
Inventor
T Seko
T Kaji
M Yamane
S Murayama
T Miyashita
M Mizushima
S Shinada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of US3801864A publication Critical patent/US3801864A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01J17/498—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with a gas discharge space and a post acceleration space for electrons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/467—Control electrodes for flat display tubes, e.g. of the type covered by group H01J31/123

Definitions

  • a display device comprising means for forming a dis- [73] Asslgnee' Tokyo Japan charge space including a plurality of discharge elec- [22] Fil d; F b, 15, 1973 trodes constituting an electron source, a plurality of first control grids arranged in parallel for controlling [21] Appl 332545 the electron beam generated from the discharge space, a plurality of second control grids arranged in [30] Foreign Application Priority Data parallel with each other and at right angles to said first Feb.
  • the present invention relates to a display device for use in a television or the like or more in particular to a display device using gaseous discharge as an electron source.
  • a well known conventional display device comprises a vacuum housing in which are arranged grid wires, a phosphor and a cathode for electron emission.
  • the cathode is such that it is impossible to emit electrons uniformly over a wide area, resulting in an unsatisfactory display of images.
  • One possible approach to such a problem of the conventional device is to produce electrons over a wide area by the use of gaseous discharge.
  • the use of the gaseous discharge is deemed to enable a large current to be obtained over a wider area than in the thermionic emission of electrons and enable response time to be improved.
  • the present invention is characterized by the fact that a control voltage is applied to a line at a time and a discharge voltage in synchronism with the control voltage is applied to that discharge electrode for effecting a discharge only in the portion of the discharge space corresponding to the control grid to which the control voltage is applied.
  • FIG. 1 is a diagram showing the construction of the display device according to the present invention.
  • FIG. 2 is a block diagram showing an embodiment of the present invention.
  • FIG. 3 is a diagram of waveforms for explaining the operation of the embodiment of FIG. 2.
  • reference numeral 1 shows a transparent insulating plate of glass or the like
  • numeral 2 a transparent conductive film of NESA film (trade mark) or the like laid on the surface of the transparent insulating plate 1
  • numeral 3 a phosphor layer applied on the transparent conductive layer 2
  • numeral 4 including numerals 4-1, 4-2 and 4-3, first control grids arranged in parallelwith each other on a plane almost in parallel with the phosphor layer 3
  • numeral 5 a first insulating frame
  • numeral 6 an accelerating space formed in the first insulating frame
  • numeral 8 a first insulating separator inserted between the first control grids 4 and the second control grids 7, numeral 9 a conductive shielding plate
  • numeral 10 a second insulating separator inserted between
  • Reference numerals 17 and 18, including numerals 17-1, 17-2, l7-3, 18-1, 18-2 and 18-3, show discharge electrodes for releasing electrons in the discharge space 12.
  • the accelerating space 6, the discharge space 12 and the control space are hermetically sealed, each containing inert gas, silver vapor or mixed gas thereof.
  • a voltage is applied between the discharge electrodes 17 and 18 thereby to effect gaseous discharge in the discharge space 12.
  • the electrons released by the gaseous discharge are passed by diffusion to the control space through the apertures bored in the conductive shielding plate 9.
  • a bias voltage which is negative with respect to the conductive shielding plate 9 is applied to the second control grids 7, the electrons are attracted back to the conductive shielding plate 9.
  • a control voltage causes the electron beam to pass through only those apertures 15 in the insulating plate 10 which correspond to the control grid 7-1.
  • the control voltage is applied only to a specified one of the first control grids 4
  • electrons are accelerated to pass into the accelerating space through only those apertures of the insulating plate 8 involving the first and second control grids to which the control voltage is applied.
  • Those electrons are accelerated in the accelerating space by the high voltage 12 applied to the transparent conductive film 2 and impinge upon the phosphor with high energy thereby to illuminate it. Accordingly, it is possible to display a television image due to an image signal by employing a signal corresponding to an image signal such as pulse-width modulated signal as the control voltage applied to either the first grids or second grids.
  • FIG. 2 an image is displayed by the pulse-width modulation in which the image signal corresponding to the image to be displayed is represented by a pulse width equivalent to the level of the image signal.
  • the reference numeral 19 generally shows the display device according to the invention as shown in FIG. 1 which includes the discharge electrodes 17 and 18, the first control grids 4 and the second control grids 7. Each of the discharge electrodes 17 is independent of each other, while the other electrodes 18 are connected with each other.
  • Reference numeral 20 shows an input terminal for vertical synchronizing signals
  • numeral 21 an input terminal for horizontal synchronizing signals
  • numeral 22 an input terminal for image signals
  • numeral 23 a delay circuit or line with a delay time equal to the horizontal scanning period or the period required for generation of the horizontal synchronizing signal.
  • the delay circuit 23 has output terminals in the number of M corresponding to the grids 4-1, 4-2, 4-3, 4-M.
  • Reference numeral 25 shows a pulse width modulation circuit containing an analog memory
  • numeral 26 a vertical line driving circuit driven by the output of the pulse width modulation circuit
  • numeral 27 a horizontal line scanning circuit driven by the horizontal synchronizing signal which is provided with output terminals in the number of N corresponding to the second control grids 7-l, 72, 73, 7N
  • numeral 28 a horizontal line driving circuit with its input signal provided by the scanning pulse from the horizontal line scanning circuit
  • numeral 29 a power supply for generating discharge voltages in sequence at the N output terminals periodically in synchronism with the horizontal synchronizing signal
  • numeral 30 another power supply for applying a high voltage to the transparent conductive film 2.
  • the video signal for one horizontal scanning period is distributed over the delay circuit.
  • application of a horizontal synchronizing signal to the gate circuit 24 through the terminal 21 causes each of the gates to conduct, so that a signal appearing at each of the output terminals of the delay circuit 23 is applied to each input terminal of the pulse width modulation circuit 25 are converted into M signals of the same amplitude but with widths different according to their lev- 1 els, which pulses are amplified by the vertical line driving circuits 25 and applied to the first control grids 4-1, 4-2, 4-M.
  • the vertical synchronizing signal obtained through the terminal 20 and the horizontal synchronizing signal produced through the terminal 21 drive the horizontal line scanning circuit 27, whereupon the output terminals thereof in the number of N corresponding to the second grids 7-1, 72, 7N produce sequential scanning pulses at an interval approximate to the horizontal scanning period.
  • the scanning pulses are amplified by the horizontal line driving circuit 28 and applied to the second control grids 71, 72, 7N in sequence.
  • Discharge pulse voltages are produced from the power supply in synchronism with the scanning pulses applied sequentially to the second control grids 7-1, 72, 7-3, 7N or the horizontal synchronizing signal for driving the horizontal scanning circuit.
  • the discharge pulse voltages are applied to the discharge electrodes l7 and 18.
  • the discharge electrodes l7-l, 17-2, l7-N are connected to the output terminals of the power supply 29 independently of each other through the lines [-1, l-2, l-N, while to that discharge electrode corresponding to the control grid to which the scanning pulse is applied.
  • control voltage is applied only to the grid 72 and the discharge voltage applied only to to the discharge electrodes 17-2 and l8 2 during the period from t, to t In like manner, not only the control voltage but the discharge voltage are applied in sequence in the subsequent processes.
  • FIG. 1 Even though the embodiment of FIG. 1 involves three grids and three discharge electrodes, it is needless to say that it is possible to manufacture a display device with n grids and n discharge electrodes with the same advantages. Further, an AC instead of DC voltage may be employed as the discharge voltage.
  • a set of discharge electrodes may be usually provided for a plurality of the control grids in the-number of, say, m. In such a case, it is also needless to say that is suffices to apply the discharge voltage to the same set of discharge electrodes during the scanning of the m control grids.
  • a display device comprising a first insulating member for forming a discharge space for effecting gaseous discharge, said first insulating member being provided with a plurality of discharge electrodes as a source of electrons, a second insulating member for hermetically sealing said discharge space, a conductive member provided with a plurality of small apertures through which an electron beam from said discharge space is adapted to be passed, a third insulating member for forming an accelerating space for accelerating the electron beam passing through said plurality of small apertures, a transparent insulating member for hermetically sealing said accelerating space, first and second control grids interposed between said conductive member and said third insulating member for controlling the entrance of said electron beam into said accelerating space, said control grids intersecting each other at the positions corresponding to said small apertures, an insulating separator provided with a plurality of small apertures at the positions corresponding to those of said small apertures in said conductive member in sucha manner that said first and second control grids in certain spaced relationship intersect, a

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
US00332545A 1972-02-25 1973-02-15 Display device Expired - Lifetime US3801864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47018946A JPS4889679A (enrdf_load_stackoverflow) 1972-02-25 1972-02-25

Publications (1)

Publication Number Publication Date
US3801864A true US3801864A (en) 1974-04-02

Family

ID=11985798

Family Applications (1)

Application Number Title Priority Date Filing Date
US00332545A Expired - Lifetime US3801864A (en) 1972-02-25 1973-02-15 Display device

Country Status (3)

Country Link
US (1) US3801864A (enrdf_load_stackoverflow)
JP (1) JPS4889679A (enrdf_load_stackoverflow)
DE (1) DE2308323A1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992644A (en) * 1975-06-20 1976-11-16 Zenith Radio Corporation Cathodoluminescent display with hollow cathodes
US4009415A (en) * 1975-11-24 1977-02-22 Bell Telephone Laboratories, Incorporated Plasma panel with dynamic keep-alive operation utilizing a lagging sustain signal
US4020280A (en) * 1973-02-21 1977-04-26 Ryuichi Kaneko Pulse width luminance modulation system for a DC gas discharge display panel
US4021607A (en) * 1973-05-19 1977-05-03 Sony Corporation Video display system employing drive pulse of variable amplitude and width
FR2389996A1 (enrdf_load_stackoverflow) * 1977-05-05 1978-12-01 Siemens Ag
US4227114A (en) * 1977-02-16 1980-10-07 Zenith Radio Corporation Cathodoluminescent gas discharge image display panel
US4229766A (en) * 1977-05-05 1980-10-21 Siemens Aktiengesellschaft Scanning apparatus and method for operating the apparatus
US4540983A (en) * 1981-10-02 1985-09-10 Futaba Denshi Kogyo K.K. Fluorescent display device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5412294B2 (enrdf_load_stackoverflow) * 1974-06-28 1979-05-22
JPS5853462B2 (ja) * 1976-09-20 1983-11-29 松下電器産業株式会社 画像表示装置
DE2952528C2 (de) * 1979-12-28 1985-10-10 Siemens AG, 1000 Berlin und 8000 München Gasentladungsanzeigevorrichtung
DE3132070A1 (de) * 1981-08-13 1983-03-03 Siemens AG, 1000 Berlin und 8000 München Steuerung des elektronenflusses in plasma-displays
DE3911351A1 (de) * 1989-04-07 1990-10-11 Nokia Unterhaltungselektronik Flache anzeigeeinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176184A (en) * 1961-02-20 1965-03-30 Roy L Knox Electron deflection system for image reproduction including flat tube and planar cathode
US3579015A (en) * 1969-03-18 1971-05-18 Monsanto Co Electron beam addressed plasma display panel
US3753041A (en) * 1970-11-18 1973-08-14 Sperry Rand Corp Digitally addressable gas discharge display apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176184A (en) * 1961-02-20 1965-03-30 Roy L Knox Electron deflection system for image reproduction including flat tube and planar cathode
US3579015A (en) * 1969-03-18 1971-05-18 Monsanto Co Electron beam addressed plasma display panel
US3753041A (en) * 1970-11-18 1973-08-14 Sperry Rand Corp Digitally addressable gas discharge display apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020280A (en) * 1973-02-21 1977-04-26 Ryuichi Kaneko Pulse width luminance modulation system for a DC gas discharge display panel
US4021607A (en) * 1973-05-19 1977-05-03 Sony Corporation Video display system employing drive pulse of variable amplitude and width
US3992644A (en) * 1975-06-20 1976-11-16 Zenith Radio Corporation Cathodoluminescent display with hollow cathodes
US4009415A (en) * 1975-11-24 1977-02-22 Bell Telephone Laboratories, Incorporated Plasma panel with dynamic keep-alive operation utilizing a lagging sustain signal
US4227114A (en) * 1977-02-16 1980-10-07 Zenith Radio Corporation Cathodoluminescent gas discharge image display panel
FR2389996A1 (enrdf_load_stackoverflow) * 1977-05-05 1978-12-01 Siemens Ag
US4229766A (en) * 1977-05-05 1980-10-21 Siemens Aktiengesellschaft Scanning apparatus and method for operating the apparatus
US4540983A (en) * 1981-10-02 1985-09-10 Futaba Denshi Kogyo K.K. Fluorescent display device

Also Published As

Publication number Publication date
DE2308323A1 (de) 1973-09-13
JPS4889679A (enrdf_load_stackoverflow) 1973-11-22

Similar Documents

Publication Publication Date Title
US3800186A (en) Display device
US3801864A (en) Display device
US3875442A (en) Display panel
US3262010A (en) Electrical display apparatus incorpolrating electroluminescent and gas discharge devices
US5986399A (en) Display device
US6023126A (en) Edge emitter with secondary emission display
US3624273A (en) Flat screen display devices using an array of charged particle sources
JPH01173552A (ja) 平面型画像表示装置の線陰極駆動方法
GB1340456A (en) Cathode ray display device
US3936697A (en) Charged particle beam scanning device
KR100558665B1 (ko) 전계 방출 디스플레이에서 전하의 누적을 감소시키는 방법
US3778673A (en) Low power display driver having brightness control
US3934172A (en) Flat discharge panel using D.C. discharge, and method of driving the same
US3979635A (en) Charged particle beam scanning device
US20020030646A1 (en) Highly bright field emission display device
JPH0789661B2 (ja) 平板型陰極線管の駆動方法
US5847509A (en) Microgap flat panel display
US3979636A (en) Charged particle beam scanning device
Endriz et al. Feedback multiplier flat-panel television: I—System design
JPS63110530A (ja) 平板型画像表示装置
JPS62151083A (ja) 平板形陰極線管
JPH04162086A (ja) 画像表示装置
US4107576A (en) Panel-type display device
JP2773140B2 (ja) 画像表示装置
JPS59202789A (ja) テレビジヨン受像機