US3775631A - Dispersion type electroluminescent elements - Google Patents

Dispersion type electroluminescent elements Download PDF

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Publication number
US3775631A
US3775631A US00296559A US3775631DA US3775631A US 3775631 A US3775631 A US 3775631A US 00296559 A US00296559 A US 00296559A US 3775631D A US3775631D A US 3775631DA US 3775631 A US3775631 A US 3775631A
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US
United States
Prior art keywords
electroluminescent
parts
liquid crystal
phosphor
electrodes
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
US00296559A
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English (en)
Inventor
M Morikawa
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.)
Noritake Itron Corp
Original Assignee
Ise Electronics Corp
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Filing date
Publication date
Application filed by Ise Electronics Corp filed Critical Ise Electronics Corp
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Publication of US3775631A publication Critical patent/US3775631A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded

Definitions

  • LC comprises a mixture of 100 parts, by weight, of an [51] 29/18 electroluminescent phosphor, 30 to 50 parts, by [58] n .ld 3131/1023 A weight, of a liquid crystal and 10 to 40 parts y e at weight, based on the sum of the parts of the electrolu- [56] Ref r nee Cited minescent phosphor and the liquid crystal, of an inore e s ganic binder.
  • This invention relates to a luminous display element utilizing a phosphor for electroluminescence (EL), and more particularly to a dispersed type electroluminescence display element.
  • Electroluminescence display elements are generally classified into a vapour deposited film type EL cell and a dispersed type EL cell in which an electroluminescent phosphor is dispersed in a suitable organic or inorganic binder.
  • the organic binder includes castor oil, glycerine, a cetal resins, epoxide resins, methymethacrylate polyester, polyethylene, polystyrene, cyanoethyl cellulose, etc.
  • the inorganic binder includes ferroelectric materials, such as electroluminescent enamel, barium titanate, R chelle salt, potassium phosphate hydroxide and lead titanate.
  • the conventional dispersed type EL cell comprises a metal electrode 1, a transparent electrode 2, an electro-luminescent display element 3 comprising a mixture of an electroluminescent phosphor and an organic or an inorganic binder of the type described above, spacers 4 made of a synthetic resin and interposed between electrodes 1 and 2 for defining a gap between the two electrodes 1 and 2 for accommodating the electroluminescent display element 3 and an insulator film interposed between electrode 2 and luminescent display element 3 for the purpose of preventing insulation breakdown.
  • the organic or inorganic binder should satisfy the following requirements. (a) It can be suitably admixed with the electroluminescent phosphor. (2) It should not react chemically with the electroluminescent phosphor.
  • a scattered type electroluminescent display element comprising a pair of opposed electrodes and an electroluminescent layer disposed between the electrodes, the electroluminescent layer comprising a mixture of I00 parts, by weight, of an electroluminescent phosphor, 30 to 50 parts, by weight, of a liquid crystal and 10 to 40 parts, by weight, based on the sum of the parts of the electroluminescent phosphor and the liquid crystal, of an inorganic binder.
  • the liquid crystal is characterized in that (I) it has an extremely high insulation strength, (2) it can be thoroughly admixed with and dispersed in the electroluminescent phosphor at any ratio, (3) it can act as an organic binder which is stable over severel thousands hours without aging (4) it is transparent of slightly clouded so that it can efficiently emanate luminous light, (5) it establishes a dipole moment when impressed with a voltage so as to apply electric field efficiently across the phosphor and (6) it has a relatively high dielectric constant.
  • the inorganic binder is advantageous in that (1) it has an extremely high dielectric constant and (2) it can reflect electroluminescent light where it is white.
  • FIG. 1 shows a sectional view of a prior art dispersion type electroluminescent cell
  • FIG. 2 is a sectional view of an improved dispersion electro-luminescent cell embodying the invention.
  • FIG. 2 shows one embodiment of this invention comprising electrodes 11 and 12, at least one of them being transparent, and an electroluminescent layer 13 comprising the above described mixture of an electroluminescent phosphor, a liquid crystal and inorganic binder.
  • the liquid crystal shows liquid state in the room temperature and high insulating characteriscs.
  • the liquid crystal which is used in the present invention for example, is MBBA (Methoxy Benzilyden Buthyl Aniline), EBBA (Ethoxy Benzilyden Buthyl Aniline) or a mixtre thereof.
  • an operating voltage is applied across electrodes 11 and 12 to apply an electric field across the electroluminescent layer. Accordingly, the luminous centers of the phosphor are excited. When the polarity of the applied field is reversed, the excited electrons recombine with the luminous centers to emanate electroluminescence characteristic of the electroluminescent phosphor used. The light is seen through the transparent electrode.
  • this invention utilizes the advantages of both the liquid crystal and inorganic binder. Consequently, it is not necessary to use the insulator film for preventing insulation breakdown so that it is possible to increase the brightness of the electroluminescent element, and to simplify the construction and fabrication of the element. Fruther the operation of the electroluminescent element of this invention is stable over a long period without aging.
  • a dispersion type electroluminescent element of the type comprising a pair of electrodes and an electroluminescent layer sandwiched between said electrodes, said layer including an electroluminescent phosphor dispersed in an organic or inorganic binder
  • said electroluminescent layer comprises a mixture of parts, by weight, of an electroluminesccnt phosphor, 30 to 50 parts, by weight, of l liquid crystal and 10 to 40 parts, by weight, based on the sum of the parts of said electroluminescent phosphor and said liquid crystal, of an inorganic binder.
  • liquid crystal is selected from the group consisting of MBBA (Methoxy Benzilyden Buthyl Aniline), EBBA (Ethoxy Benzilyden Buthyl Aniline) and a mixture thereof.

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  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Luminescent Compositions (AREA)
US00296559A 1971-10-11 1972-10-11 Dispersion type electroluminescent elements Expired - Lifetime US3775631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46079991A JPS4845187A (enrdf_load_stackoverflow) 1971-10-11 1971-10-11

Publications (1)

Publication Number Publication Date
US3775631A true US3775631A (en) 1973-11-27

Family

ID=13705761

Family Applications (1)

Application Number Title Priority Date Filing Date
US00296559A Expired - Lifetime US3775631A (en) 1971-10-11 1972-10-11 Dispersion type electroluminescent elements

Country Status (7)

Country Link
US (1) US3775631A (enrdf_load_stackoverflow)
JP (1) JPS4845187A (enrdf_load_stackoverflow)
CA (1) CA967674A (enrdf_load_stackoverflow)
DE (1) DE2249867C3 (enrdf_load_stackoverflow)
FR (1) FR2156211B1 (enrdf_load_stackoverflow)
GB (1) GB1414498A (enrdf_load_stackoverflow)
IT (1) IT968852B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844637A (en) * 1973-08-29 1974-10-29 Bunker Ramo Integrated liquid crystal luminophor display
US4097776A (en) * 1977-03-25 1978-06-27 The United States Of America As Represented By The Secretary Of The Air Force Coated electroluminescent phosphors
EP0066453A3 (en) * 1981-05-27 1983-01-26 Hitachi, Ltd. Dispersion type electroluminescent element
EP0159531A1 (en) * 1984-03-23 1985-10-30 Matsushita Electric Industrial Co., Ltd. Thin film EL panel
US5115329A (en) * 1989-08-17 1992-05-19 Alps Electric Co., Ltd. Electroluminescent device having a liquid crystal layer adjacent to the electroluminescent layer without any electrode placed therebetween
US5336965A (en) * 1990-12-21 1994-08-09 Ford Motor Company Solar load reduction glazing unit with electroluminescent element
US5748271A (en) * 1995-08-21 1998-05-05 U.S. Philips Corporation Electroluminescent device having electroluminescent compound and liquid crystalline compound
US5783292A (en) * 1994-09-29 1998-07-21 Kabushiki Kaisha Toyota Chuo Kenkyusho Electroluminescent device with organic-inorganic composite thin film
US20050043586A1 (en) * 2003-03-17 2005-02-24 Olympus Corporation Capsule endoscope
US6897913B2 (en) * 2000-07-19 2005-05-24 Canon Kabushiki Kaisha Luminescence device
US20060097633A1 (en) * 2004-11-08 2006-05-11 Samsung Sdi Co., Ltd. Organic electroluminescent device and method for manufacturing the same
US20230232646A1 (en) * 2020-05-26 2023-07-20 Sharp Kabushiki Kaisha Light-emitting element and method of manufacturing light-emitting element

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3738414A1 (de) * 1987-11-12 1989-05-24 Bosch Gmbh Robert Vorrichtung zur ausleuchtung von passiven informationsanzeigen, vorzugsweise lcd's
GB2236495B (en) * 1989-10-07 1993-09-22 P J Mason & Co Limited Improvements in or relating to illuminating arrangements
JPH07135080A (ja) * 1993-11-11 1995-05-23 Yazaki Corp 有機・無機系ハイブリット型発光素子およびその製造方法
DE19916747A1 (de) * 1999-04-13 2000-10-19 Mannesmann Vdo Ag Selbstleuchtende LCD-Anzeigevorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306770A (en) * 1963-06-25 1967-02-28 Hercules Inc Electroluminescent panel
US3560784A (en) * 1968-07-26 1971-02-02 Sigmatron Inc Dark field, high contrast light emitting display

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306770A (en) * 1963-06-25 1967-02-28 Hercules Inc Electroluminescent panel
US3560784A (en) * 1968-07-26 1971-02-02 Sigmatron Inc Dark field, high contrast light emitting display

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844637A (en) * 1973-08-29 1974-10-29 Bunker Ramo Integrated liquid crystal luminophor display
US4097776A (en) * 1977-03-25 1978-06-27 The United States Of America As Represented By The Secretary Of The Air Force Coated electroluminescent phosphors
EP0066453A3 (en) * 1981-05-27 1983-01-26 Hitachi, Ltd. Dispersion type electroluminescent element
US4517490A (en) * 1981-05-27 1985-05-14 Hitachi, Ltd. Dispersion type electroluminescent element with liquid dielectric and jelling agent
EP0159531A1 (en) * 1984-03-23 1985-10-30 Matsushita Electric Industrial Co., Ltd. Thin film EL panel
US4668582A (en) * 1984-03-23 1987-05-26 Matsushita Electric Industrial Co., Ltd. Thin film EL panel
US5115329A (en) * 1989-08-17 1992-05-19 Alps Electric Co., Ltd. Electroluminescent device having a liquid crystal layer adjacent to the electroluminescent layer without any electrode placed therebetween
US5336965A (en) * 1990-12-21 1994-08-09 Ford Motor Company Solar load reduction glazing unit with electroluminescent element
US5783292A (en) * 1994-09-29 1998-07-21 Kabushiki Kaisha Toyota Chuo Kenkyusho Electroluminescent device with organic-inorganic composite thin film
US5748271A (en) * 1995-08-21 1998-05-05 U.S. Philips Corporation Electroluminescent device having electroluminescent compound and liquid crystalline compound
US6897913B2 (en) * 2000-07-19 2005-05-24 Canon Kabushiki Kaisha Luminescence device
US20050043586A1 (en) * 2003-03-17 2005-02-24 Olympus Corporation Capsule endoscope
US7229407B2 (en) * 2003-03-17 2007-06-12 Olympus Corporation Capsule endoscope with electroluminescence light source
US20060097633A1 (en) * 2004-11-08 2006-05-11 Samsung Sdi Co., Ltd. Organic electroluminescent device and method for manufacturing the same
US8044584B2 (en) * 2004-11-08 2011-10-25 Samsung Mobile Display Co., Ltd. Organic electroluminescent device and method for manufacturing the same
US20230232646A1 (en) * 2020-05-26 2023-07-20 Sharp Kabushiki Kaisha Light-emitting element and method of manufacturing light-emitting element

Also Published As

Publication number Publication date
FR2156211A1 (enrdf_load_stackoverflow) 1973-05-25
DE2249867A1 (de) 1973-04-12
DE2249867B2 (de) 1974-11-14
DE2249867C3 (de) 1975-06-26
FR2156211B1 (enrdf_load_stackoverflow) 1975-09-12
JPS4845187A (enrdf_load_stackoverflow) 1973-06-28
CA967674A (en) 1975-05-13
GB1414498A (en) 1975-11-19
IT968852B (it) 1974-03-20

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