US3869630A - Discharge luminescence element array having a gas flow path - Google Patents

Discharge luminescence element array having a gas flow path Download PDF

Info

Publication number
US3869630A
US3869630A US339916A US33991673A US3869630A US 3869630 A US3869630 A US 3869630A US 339916 A US339916 A US 339916A US 33991673 A US33991673 A US 33991673A US 3869630 A US3869630 A US 3869630A
Authority
US
United States
Prior art keywords
pair
separator
insulator plates
discharge
flow path
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
US339916A
Other languages
English (en)
Inventor
Kenji Maio
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 US3869630A publication Critical patent/US3869630A/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
    • H01J17/492—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes

Definitions

  • a discharge luminescence element array comprismg a 1511 110. C1 HOlj l/78, H01 j 11/02 p of parallel insulating Plates and a separator 5 Field f Search 313/1095 201 210 220 tirely sealed between the pair of insulating plates in 313/221 133; 315/1 9 Rv 169 340/334 which a groove-like gas flow path is provided between M, 1 R, 1 EL one of the plates and the separator for evacuating and providing gas from and to discharge spaces defined by 5 References Ci the separator and the pair of insu1ating plates.
  • the present invention relates to a structure of a discharge luminescence element array and more particularly to a structure of a discharge luminescent element array for minimizing light leakage or optical cross-talk between luminescent elements.
  • FIG. 1 is a perspective view of a conventional switching matrix comprising a discharge luminescent element array and a photoconductive element array.
  • FIG. 2 is a cross-sectional view of a conventional arrangement for preventing light leakage or optical crosstalk between the luminescent elements of the discharge luminescent element array.
  • FIGS. 3a and 3b are plan and cross-sectional views, respectively, of a discharge luminescent element array according to the present invention.
  • FIG. 4 is a diagram for explaining the path of light leakage between the luminescent elements of the discharge luminescent element array of FIGS. 3a and 3b.
  • an arrangement comprising a discharge luminescent element array 1 and a photoconductive element array 2 in which the photoconductive element array 2 acts as a switch and the discharge luminescent element array 1 acts as a driver therefor.
  • the discharge luminescent element array 1 consists of an insulator plate 11 having thereon transparent or semi-transparent electrodes 10, a separator 12 having discharge spaces 13 formed therein, and an insulator plate 14 having thereon transparent or semitransparent electrodes 15. If there occurs light irradiation or optical cross-talk between adjacent luminescent elements of the discharge luminescent element array 1, it disadvantageously reduces the resistance of the corresponding photoconductive element at the switched off time.
  • the discharge luminescence element array in which optical cross-talk is reduced to as low a degree as possible there is known a type in which the opaque separator 12' is formed into comb-like configuration as shown in FIG. 2.
  • This separator can be provided on the insulator plates 11 and 14 by, for example, a printing methocLHowever, since it is necessary for the separator to be printed with a high accuracy of several tens of microns when the spacing between the luminescence elements is low, the provision of the separator by this method is practically difficult.
  • the present invention is intended to overcome the above disadvantage of the prior art arrangement.
  • An object of the present invention' is to provide a discharge luminescent element array in which optical cross-talk between discharge luminescent elements is much reduced and which is simple in structure.
  • FIGS. 3a and 3b An embodiiment of the discharge luminescent element array according to the present invention is illustrated in FIGS. 3a and 3b in plan and elevational crosssectional views, respectively.
  • the discharge luminescent element array comprises a pair of parallel insulator plates 11 and 14, a separator 12" interposed between the pair of insulating plates 11 and 14, and electrodes l0 and 15.
  • the plates 11 and 14 and the separator 12" are sealed together by cement, for example a glass material, to define discharge spaces 13.
  • the glass material used for the cement 18 is commonly formed by overlaying a mixture liquid of glass powder, nitrocellulose and its solvent, for example carbitol acetate, on the plates 11 and 14 or separator 12" by, for example, a printing method and by firing, at which time the carbon in the nitrocellulose is partially separated to generally turn the cement pale grey.
  • FIG. 4 is an enlarged view of a part of the luminescent element array between two adjacent luminescent elements shown in FIG. 3b.
  • T (T )'2"1l Since the photo-penetrating power of glass material at about 50 microns is commonly of the order of 40 to percent, the optical cross-talk or light leakage between two luminescent, elements, i.e., the photopenetrating power T can be provided by putting the distance I between two luminescent elements approximately at 2 For example, for T 70 percent, 1 50 ,u, and t 2 mm, T is given by T z 10' from Equation (I). This is a very small value. Thus, the amount of light irradiation-or light leakage to the adjacent luminescent element can markedly be reduced by employing
  • the discharge spaces 13 are made airtight so that the gas in the discharge spaces cannot be evacuated nor can the discharge spaces be filled with any discharge gas. For this reason it is necessary to provide the discharge spaces 13 with the gas flow path '17. It is effective for the gas flow path to be formed into a narrow zigzag groove shape to give a light shielding effect.
  • the separator 12" of a glass filter having a high photoabsorptive power (Corning glass filter No. 7-56; Trade Mark)
  • the spacing between adjacent two luminescent elements of a 2.5 mm the light leakage is about l0.
  • the separator 12" is not entirely sealed, but sealed only at its peripheral portion, the light leakage or optical cross-talk is about 5 X 10.
  • the present invention can reduce the optical cross-talk to about one-fiftieth or less.
  • the gas flow path 17 between adjacent two discharge spaces 13 is a segmental line having only one break point, it can advantageously have a number of break points. However, if so high a light attenuation is not required, the gas flow path 17 can be made a straight line having no break point.
  • a discharge luminescence element array comprising a pair of parallel insulator plates, electrodes provided on the outer faces of said pair of insulator plates, and a separator interposed between said pair of insulator plates, said separator having a plurality of apertures formed therein defining the same plurality of discharge spaces with said pair of insulator plates, the improvement comprising a groove-like gasflow path provided at the interface between one of said pair of insulator plates and said separator for evacuating gas from and providing a discharge gas to said discharge spaces, said separator being sealed at its entire main faces to said pair of insulator plates.
  • each of said insulator plates is a filter glass plate.
  • a separator interposed between the inner faces of said pair of insulator plates, said separator having a plurality of apertures formed therein defining a plurality ofdischarge spaces confined between said insulator plates, which discharge spaces terminate at said inner faces of said insulator plates;
  • the improvement comprising means for sealing said separator at the respective interfaces thereof with said inner faces of said pair of insulator plates comprising a light absorbent cement.
  • said gas flow path comprises an aperture interconnecting respective individual ones of said discharge spaces with each other, the cross-section of said aperture being considerably less than the cross-section of said discharge spaces.
  • each of said insulator plates contains a filter glass material
  • said separator is made of a glass filter material having a high photoabsorptive power
  • said cement is substantially opaque.
  • said gas flow path comprises an'aperture interconnecting respective individual ones of said discharge spaces with each other, the cross-section of said aperture being considerably less than the cross section of said discharge spaces.
  • a discharge luminescence element array comprising:

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US339916A 1972-03-13 1973-03-09 Discharge luminescence element array having a gas flow path Expired - Lifetime US3869630A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2563872A JPS538187B2 (ru) 1972-03-13 1972-03-13

Publications (1)

Publication Number Publication Date
US3869630A true US3869630A (en) 1975-03-04

Family

ID=12171381

Family Applications (1)

Application Number Title Priority Date Filing Date
US339916A Expired - Lifetime US3869630A (en) 1972-03-13 1973-03-09 Discharge luminescence element array having a gas flow path

Country Status (4)

Country Link
US (1) US3869630A (ru)
JP (1) JPS538187B2 (ru)
DE (1) DE2312164A1 (ru)
IT (1) IT980553B (ru)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024613A (en) * 1975-01-02 1977-05-24 Owens-Illinois, Inc. Method of permanently attaching metallic spacers in gaseous discharge display panels
US4827186A (en) * 1987-03-19 1989-05-02 Magnavox Government And Industrial Electronics Company Alternating current plasma display panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509407A (en) * 1967-09-15 1970-04-28 Burroughs Corp Display panel
US3600626A (en) * 1969-11-26 1971-08-17 Burroughs Corp Multicell display device having communication paths between adjacent cells
US3689910A (en) * 1970-10-28 1972-09-05 Burroughs Corp Electrooptical display system including optical encoding means
US3704386A (en) * 1971-03-19 1972-11-28 Burroughs Corp Display panel and method of operating said panel to produce different colors of light output
US3766420A (en) * 1972-03-17 1973-10-16 Burroughs Corp Panel-type display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509407A (en) * 1967-09-15 1970-04-28 Burroughs Corp Display panel
US3600626A (en) * 1969-11-26 1971-08-17 Burroughs Corp Multicell display device having communication paths between adjacent cells
US3689910A (en) * 1970-10-28 1972-09-05 Burroughs Corp Electrooptical display system including optical encoding means
US3704386A (en) * 1971-03-19 1972-11-28 Burroughs Corp Display panel and method of operating said panel to produce different colors of light output
US3766420A (en) * 1972-03-17 1973-10-16 Burroughs Corp Panel-type display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024613A (en) * 1975-01-02 1977-05-24 Owens-Illinois, Inc. Method of permanently attaching metallic spacers in gaseous discharge display panels
US4827186A (en) * 1987-03-19 1989-05-02 Magnavox Government And Industrial Electronics Company Alternating current plasma display panel

Also Published As

Publication number Publication date
JPS538187B2 (ru) 1978-03-25
IT980553B (it) 1974-10-10
JPS4894363A (ru) 1973-12-05
DE2312164A1 (de) 1973-09-20

Similar Documents

Publication Publication Date Title
US3704386A (en) Display panel and method of operating said panel to produce different colors of light output
US3821588A (en) Display panel having flat side edges to permit butting together plural panels
US3886390A (en) Buttable, gaseous discharge, display panel including electrodes providing a dot matrix display
US5754004A (en) Gas discharge type display device and method of producing same
US3869630A (en) Discharge luminescence element array having a gas flow path
US3603837A (en) Visual display devices
US3619698A (en) Display panel
US4689617A (en) Concentric via plasma panel
US3753041A (en) Digitally addressable gas discharge display apparatus
US4013912A (en) Gas mixture for glow discharge device
US3986074A (en) Luminous radiation panel apparatus
JPS58141B2 (ja) カラ− ガスホウデンデイスプレイソウチ
US3509402A (en) Digit readout device
US2421192A (en) Multicathode phototube
KR870002540A (ko) 형광 표시 장치
US3849693A (en) Multiple position display panel having segmented electrodes
US3188509A (en) Glow-discharge digit lamp
US3819975A (en) Multi-digit glow indicator tube
US3931537A (en) Matrix electrode gas discharge display panel having terminals spaced wider than electrodes
US5001393A (en) Color plasma display device
US3858073A (en) Plane multi-digit type electric discharge display devices
US3810686A (en) Method of fabricating a plasma charge transfer device
US3903448A (en) Multiple character flat panel display device
DE2926775A1 (de) Plasma-display
US3912964A (en) Multi-digit display apparatus