EP2109877A2 - Verfahren zur formung einer fluoreszierenden kaltkathodenlampe, darin verwendete dickfilmelektrodenzusammensetzungen sowie daraus geformte lampen und lcd-vorrichtungen - Google Patents

Verfahren zur formung einer fluoreszierenden kaltkathodenlampe, darin verwendete dickfilmelektrodenzusammensetzungen sowie daraus geformte lampen und lcd-vorrichtungen

Info

Publication number
EP2109877A2
EP2109877A2 EP08713260A EP08713260A EP2109877A2 EP 2109877 A2 EP2109877 A2 EP 2109877A2 EP 08713260 A EP08713260 A EP 08713260A EP 08713260 A EP08713260 A EP 08713260A EP 2109877 A2 EP2109877 A2 EP 2109877A2
Authority
EP
European Patent Office
Prior art keywords
glass
conductive layer
thick film
electrode
glass tube
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.)
Withdrawn
Application number
EP08713260A
Other languages
English (en)
French (fr)
Inventor
Joel Slutsky
Brian D. Veeder
Andy Kao
Thomas Lin
Hsiu-Wei Wu
Tjong-Ren Chang
Shuang-Chang Yang
Wen-Chun Chiu
Jin-Yuh Lu
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP2109877A2 publication Critical patent/EP2109877A2/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/28—Manufacture of leading-in conductors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/52—Means forming part of the tube or lamps for the purpose of providing electrical connection to it directly applied to or forming part of the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes

Definitions

  • the present invention claims priority from provisional application 60/802,912, filed on May 24, 2006.
  • the present invention relates to method(s) of fabricating a cold cathode fluorescence lamp (CCFL) utilizing thick film compositions.
  • the CCFL of the present invention may be used in thin film transistor-liquid crystal display (TFT-LCD) applications and to provide a structure of the electrodes of CCFL's used in TFT-LCD backlight units.
  • TFT-LCD thin film transistor-liquid crystal display
  • Liquid crystal display devices comprise two pieces of polarized glass having a polarizing film side and a glass side.
  • a special polymer that creates microscopic grooves (oriented in the same direction as the polarizing film) in the surface is rubbed on the non-polarizing film side of the glass.
  • a coating of nematic liquid crystals is added to one of the filters.
  • the grooves cause the first layer of molecules of the liquid crystals to align with the filter's orientation.
  • the second piece of glass is added with the polarizing film at a right angle to the first piece. Each successive layer of liquid crystal molecules gradually twists until the uppermost layer is at a 90 degree angle to the bottom, thus matching the orientation of the second polarized glass filter.
  • the first filter As light strikes the first filter, it is polarized. If the final layer of liquid crystal molecules is matched up with the second polarized glass filter, then the light will pass through. The light which passes through is controlled through the use of electric charges to the liquid crystal molecules.
  • the present invention provides a method of forming a cold cathode fluorescent lamp comprising the steps of: providing a conductive layer thick film composition comprising electrically functional particles and organic medium; providing a cylindrical glass tube having a first end, a second end, a first internal electrode, a second internal electrode, and an inner peripheral wall wherein a fluorescent substance is provided along said inner peripheral wall and wherein a discharge gas is injected into said glass tube and wherein said first internal electrode extends from inside said glass tube through said first end thus forming an internal and external portion of said first electrode and wherein said second internal electrode extends from inside said glass tube through said second end thus forming an internal and external portion of said second electrode, and wherein said glass tube, first electrode and second electrode are sealed to form a glass tube structure such that said fluorescent substance and discharge gas are contained within said glass tube structure; applying the conductive layer thick film composition onto said first end and said second end of said glass tube structure, thus forming a first conductive layer and a second conductive layer; and firing said glass tube and conductive layer thick film composition
  • the applying step above is selected from dip coating, screen printing, roll coating, and spray coating.
  • the method of further comprises a step of drying said conductive layer thick film composition prior to said firing step.
  • the method further comprises the steps of providing a protective layer composition over one or both of said first conductive layer and said second conductive layer.
  • the conductive layer thick film composition of the present invention further comprises a glass frit.
  • FIG. 1 A - an illustrative view of a conventional cold cathode fluorescent lamp.
  • FIG. 1 B - an illustrative view of a single conventional cold cathode fluorescent lamp with solder connection.
  • FIG. 1C an illustrative view of conventional cold cathode fluorescent lamps with multiple 1-to-2 inverters and solder connection.
  • FIGS. 2A -2D - an illustrative view of conventional external electrode fluorescent lamps.
  • Provisional Patent Application No. 60/802,912 is related to EEFL applications, the present invention relates to CCFL applications.
  • Another advantage of good bonding of the electrodes is the electrical performance and increased reliability. Strong and uniform bonding of the electrodes provides very close contact of the electrodes to the glass tubes of the lamps hence lower electric resistance and higher conversion efficiency of the power applied to the lamps to the power to excite the fluorescent substance inside the glass tubes.
  • the AC power for operating CCFL is usually in a range of 2OkHz to 10OkHz and the bonding at the interface of electrodes and glass tubes would likely affect the reliability performance more substantially in high electric frequency like that in CCFL.
  • FIGS. 3A-3E show a fluorescent lamp according to exemplary embodiments of the present invention.
  • the fluorescent lamp includes a cylindrical glass tube 1.
  • the fluorescent substance 3 is provided along the inner peripheral wall of the glass tube 1.
  • a discharge gas 2 which comprises an inert gas, mercury (Hg), etc. mixed with one another, is injected into the glass tube 1 , then both ends of the glass tube 1 are sealed.
  • the conductive layer 17 is a thick film paste which comprises binder materials and metals selected from the group comprising: Al, Ag, Cu, Pd, Pt and mixtures thereof.
  • the metals chosen in this invention give the conductive layer 17 very low electrical resistance.
  • An electrical sheet resistance of less than 100 m ohms/sq at 25 ⁇ m may be achieved.
  • the electrical sheet resistance range is in the range of 1 to 10 m ohms/sq @ 25 ⁇ m.
  • the sheet resistance is 3 m ohms/sq (S) 25 ⁇ m.
  • the binder composition provides the conductive layer 17 strong adhesion to the glass tube, 1 , and electrode material.
  • the method of application of the thick film paste is screen printed or dip coated. However, other methods well known to those skilled in the art are possible. Applicable thick film paste compositions useful in the present invention are described in detail below.
  • the functional phase is comprised of electrically functional conductor powder(s).
  • the electrically functional powders in a given thick film composition may comprise a single type of powder, mixtures of powders, alloys or compounds of several elements.
  • Electrically functional conductive powders that may be used in this invention comprise, but are not limited to gold, silver, nickel, aluminum, palladium, molybdenum, tungsten, tantalum, tin, indium, ruthenium, cobalt, tantalum, gallium, zinc, magnesium, lead, antimony, conductive carbon, platinum, copper, and mixtures thereof.
  • the present invention relates to dispersions.
  • the dispersions may include compositions, particles, flakes, or a combination thereof.
  • the metal powder(s) may be nano-sized powders.
  • the electrically functional particles may be coated with a surfactant.
  • the surfactant may help to create desirable dispersion properties.
  • Typical particle sizes of the electrically functional particles are less than approximately 10 microns. It is understood the particle size will vary dependant upon the application method and desired properties of the thick film composition. In one embodiment, an average particle size (D 50 ) of 2.0-3.5 microns is used. In a further embodiment, the D 90 is approximately 9 microns. Additionally, in one embodiment, the surface area to weight ratio is in the range of 0.7 - 1.4 m2/g.
  • the organic vehicle used in the thick film composition of the present invention is preferably a nonaqueous inert liquid.
  • Use can be made of any of various organic vehicles, which may or may not contain thickeners, stabilizers and/or other common additives.
  • the organic medium is typically a solution of polymer(s) in solvent(s). Additionally, a small amount of additives, such as surfactants, may be a part of the organic medium.
  • the most frequently used polymer for this purpose is ethyl cellulose.
  • Other examples of polymers useful in the present invention include ethylhydroxyethyl cellulose, wood rosin, mixtures of ethyl cellulose and phenolic resins, varnish resins, and polymethacrylates of lower alcohols can also be used.
  • the most widely used solvents found in thick film compositions are ester alcohols and terpenes such as alpha- or beta-terpineol or mixtures thereof with other solvents such as pine oil, kerosene, dibutylphthalate, butyl carbitol, butyl carbitol acetate, hexylene glycol and high boiling alcohols and alcohol esters.
  • volatile liquids for promoting rapid hardening after application on the substrate can be included in the vehicle.
  • Various combinations of these and other solvents are formulated to obtain the viscosity and volatility requirements desired.
  • the polymer present in the organic medium is in the range of 0.2 wt. % to 8.0 wt. % of the total composition, and any range contained therein.
  • the thick film conductive composition of the present invention may be adjusted to a predetermined, screen-printable viscosity with the organic medium.
  • the thick film conductive composition comprises silver.
  • the ratio of organic medium in the thick film composition to the inorganic components in the dispersion is dependent on the method of applying the paste and the kind of organic medium used, and it can vary. Usually, the dispersion will contain 40 - 90 wt % of inorganic components and 10 -60 wt % of organic medium (vehicle) in order to obtain good wetting.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP08713260A 2007-01-23 2008-01-23 Verfahren zur formung einer fluoreszierenden kaltkathodenlampe, darin verwendete dickfilmelektrodenzusammensetzungen sowie daraus geformte lampen und lcd-vorrichtungen Withdrawn EP2109877A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US88195607P 2007-01-23 2007-01-23
PCT/US2008/000946 WO2008091673A2 (en) 2007-01-23 2008-01-23 Method of forming a cold cathode fluorescent lamp, thick film electrode compositions used therein and lamps and lcd devices formed thereof

Publications (1)

Publication Number Publication Date
EP2109877A2 true EP2109877A2 (de) 2009-10-21

Family

ID=39410035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08713260A Withdrawn EP2109877A2 (de) 2007-01-23 2008-01-23 Verfahren zur formung einer fluoreszierenden kaltkathodenlampe, darin verwendete dickfilmelektrodenzusammensetzungen sowie daraus geformte lampen und lcd-vorrichtungen

Country Status (6)

Country Link
EP (1) EP2109877A2 (de)
JP (1) JP2010517239A (de)
KR (1) KR101041243B1 (de)
CN (1) CN101636817A (de)
TW (1) TW200841377A (de)
WO (1) WO2008091673A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101581645B1 (ko) * 2015-09-08 2016-01-04 한국세라믹기술원 태양전지 전극용 무연 도전성 조성물

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2521823B2 (ja) * 1989-12-15 1996-08-07 東芝ライテック株式会社 冷陰極けい光ランプおよびこれを用いた表示装置
JPH076734A (ja) * 1992-05-01 1995-01-10 Oyo Kagaku Kenkyusho 放電装置
JP3674695B2 (ja) * 1999-06-07 2005-07-20 東芝ライテック株式会社 放電ランプ、放電ランプ装置
EP1296357A2 (de) * 2001-09-19 2003-03-26 Matsushita Electric Industrial Co., Ltd. Lichtquellevorrichtung und Flüssigkristallanzeige damit
KR100463610B1 (ko) * 2002-12-31 2004-12-29 엘지.필립스 엘시디 주식회사 백 라이트용 외부전극 형광램프 및 이의 외부전극 형성방법
KR101121837B1 (ko) * 2004-12-30 2012-03-21 엘지디스플레이 주식회사 백라이트용 외부전극 형광램프의 제조방법
JP4049802B2 (ja) * 2005-01-07 2008-02-20 シャープ株式会社 冷陰極管ランプ、照明装置及び表示装置
JP2006294593A (ja) * 2005-03-15 2006-10-26 Matsushita Electric Ind Co Ltd 冷陰極蛍光ランプおよびバックライトユニット
TW200703404A (en) * 2005-03-15 2007-01-16 Matsushita Electric Industrial Co Ltd Cold-cathode fluorescent lamp having thin coat as electrically connected terminal, production method of the lamp, lighting apparatus having the lamp, backlight unit, and liquid crystal display apparatus
KR20060131242A (ko) * 2005-06-15 2006-12-20 삼성전자주식회사 냉음극 형광램프, 이의 제조 방법, 이를 갖는 백라이트어셈블리 및 액정표시장치

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008091673A2 *

Also Published As

Publication number Publication date
WO2008091673A3 (en) 2009-01-08
KR20090102865A (ko) 2009-09-30
JP2010517239A (ja) 2010-05-20
TW200841377A (en) 2008-10-16
CN101636817A (zh) 2010-01-27
KR101041243B1 (ko) 2011-06-14
WO2008091673A2 (en) 2008-07-31

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