EP0939421B1 - Plasmabildschirm - Google Patents

Plasmabildschirm Download PDF

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Publication number
EP0939421B1
EP0939421B1 EP99200443A EP99200443A EP0939421B1 EP 0939421 B1 EP0939421 B1 EP 0939421B1 EP 99200443 A EP99200443 A EP 99200443A EP 99200443 A EP99200443 A EP 99200443A EP 0939421 B1 EP0939421 B1 EP 0939421B1
Authority
EP
European Patent Office
Prior art keywords
plasma
discharge electrodes
plasma display
discharge
display screen
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
EP99200443A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0939421A3 (de
EP0939421A2 (de
Inventor
Rob Dr. Snijkers
Markus Dr. Klein
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 Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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 Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP0939421A2 publication Critical patent/EP0939421A2/de
Publication of EP0939421A3 publication Critical patent/EP0939421A3/de
Application granted granted Critical
Publication of EP0939421B1 publication Critical patent/EP0939421B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/38—Dielectric or insulating layers

Definitions

  • the invention relates to a plasma screen with a front panel, one Back plate and a number of interposed, by partitions separate, gas-containing plasma cells, in which there is a plasma area Plasma can form between two discharge electrodes.
  • Such a plasma screen is known for example from EP 764 965 A2. It usually consists of a matrix of plasma cells (microcavities) in which one Gas discharge is ignited. This gas discharge preferably generates radiation in the UV range from a phosphor layer in the plasma cell visible light is converted into one of the colors red, green or blue. This visible light can go through the transparent glass front panel transmit.
  • the invention is therefore based on the object of having a plasma screen improved discharge efficiency and to indicate with higher efficiency. This The object is achieved by the one specified in claim 1 Plasma screen released.
  • the high losses in known plasma screens come in particular by the fact that after the ignition of the gas discharge near the as A cathode acting discharge electrode creates a layer that Glow discharges are mostly referred to as cathode drops.
  • a cathode facing region of this layer is a very high electric field strength low ion and electron density observed.
  • the current is particularly there carried by the ions, which outnumber the electrons. Due to the High electric field strength, ions are strongly accelerated in this area and give their energy mainly in elastic collisions with the gas molecules and the walls.
  • the inventive agents for local narrowing of the plasma area are suitably provided where there is a high electron density, ie not right near the cathode.
  • a high electron density ie not right near the cathode.
  • the inventive solution according to claim 1 is the inventive idea based on an increase in discharge efficiency and a higher efficiency can be achieved by providing funds that cause an area between the discharge electrodes both the highest possible electric field and as many electrons as possible are in order to be able to excite as many electrons as possible.
  • the invention is preferably applied to AC plasma screens in which the plasma cells are controlled by AC voltage and in which the Discharge electrodes according to claim 2 covered by a dielectric layer are.
  • the invention can also be used with DC plasma picture screens are used in which the discharge electrodes are not of a dielectric Layer are covered.
  • the symmetry of the discharge with respect to Polarity i.e. the similarity of the plasma near the cathode and the anode very much is important, it is preferably provided according to claim 5, that the center are arranged between the discharge electrodes. The symmetry is thereby unaffected. However, it is also conceivable to consciously consider plasma asymmetries to exploit and to consciously apply the means asymmetrically.
  • the narrowing means according to claim 6 are preferably made of dielectric Designed material. However, it is also the use of other materials, such as e.g. Metal or metal with a dielectric coating possible, whereby the Means for narrowing or lengthening the path are given a fixed potential could.
  • the design of the is particularly easy to manufacture and easy to adjust Invention according to claim 7. With a suitable design of the wells as In particular, according to claim 8, even several constrictions can be simultaneously introduced into the plasma area and the discharge path can be extended.
  • the AC plasma screen shown in detail in FIG. 1 contains one Front plate 1 and a back plate 2.
  • the front plate 1 contains a glass plate 3 a dielectric layer 4 and a thin protective layer 5 (mostly made of MgO) are applied.
  • Parallel, strip-shaped, transparent discharge electrodes 6.7 applied such that they from the dielectric layer 4 are covered.
  • the back plate 2 contains a glass plate 8 on the parallel, strip-shaped, perpendicular to the discharge electrodes 6.7 extending address electrodes 14 are applied.
  • These are from Phosphor layers 10, 11, 12 covered in one of the three primary colors red, green, blue.
  • the individual phosphor layers 10, 11, 12 are preferably made of dielectric material existing partitions (barriers) 9 separated.
  • a single plasma cell 15 in such a plasma screen is shown in Fig. 2.
  • the Front plate 1 rotated by 90 ° compared to the illustration in Fig. 1 shown.
  • a gas preferably a Noble gas mixture (He, Ne, Xe, Kr).
  • a plasma through which radiation 17 in the UV region is preferably generated (or VUV range (vacuum UV range)) is generated.
  • This UV radiation 17 stimulates the phosphor layer 10 to glow, the visible light 18 in one of the emits three primary colors, which passes through the front panel 1 and thus represents a luminous pixel on the screen.
  • the dielectric layer 4 over the transparent discharge electrodes 6, 7 serves, among other things, in the case of AC plasma picture screens for a direct discharge between the discharge electrodes 6, 7 consisting of conductive material (metal, mostly ITO (indium-doped tin oxide)) and thus the formation of a To prevent the arc from igniting the discharge. If the electric field strength in the plasma region 16 rises above the ignition field strength, the conductivity of this path increases very quickly by generating charge carriers through ionization. The charge carriers transported and deposited on the dielectric layer reduce the internal field strength to such an extent that the electron losses overcompensate for the electron gain through ionization and the discharge stops automatically.
  • conductive material metal, mostly ITO (indium-doped tin oxide)
  • FIG. 4 The construction of a plasma screen according to the invention, in which the described Disadvantages to be avoided are shown in detail in FIG. 4.
  • Plasma screens are on both the front panel 1 and the rear panel 2 between the discharge electrodes 6,7 standing, opposite Walls 20,21 arranged, which are preferably made of dielectric material.
  • FIG. 5 in which a single plasma cell is shown such a plasma screen, through these walls 20,21 Plasma region 16 in the middle between the discharge electrodes 6, 7 locally at the Position 22 tapers.
  • an area of high electric field strength generated by accelerating the electrons This causes in this area an increase in the mean electron energies, so that there electrical efficiently Energy is converted into excitation and thus into radiation energy.
  • FIG. 6 An alternative embodiment of the invention is shown in FIG. 6.
  • a wall 23 centrally between the discharge electrons 6, 7 attached, which can, however, come closer to the back plate 2. Even with only Such a wall 23 can taper the plasma area 16 at the point 24 can be achieved.
  • a wall 23 can also an extension of the discharge channel between the discharge electrodes 6.7 can be achieved, whereby UV radiation can be generated more efficiently. This comes about through the fact that all areas (see Fig. 3) are widened, so also inefficient area directly in front of the cathode which the ion number clearly outweighs the electron number. This area will however broadened by a smaller factor than the subsequent one (efficient) area, roughly equilibrium between the number of electrons and ions prevails.
  • FIG. 7 An easy to manufacture embodiment of an inventive Plasma screen is shown in Fig. 7.
  • the plasma forms in it Depressions 25, 26 and above the intermediate dielectric wall 27 from (see Fig. 8).
  • the depressions 25, 26 can be as shown in FIG. 8 be designed frustoconical with a circular cross-section, the Cross section to the back plate 2 becomes smaller, so that there are two local constrictions 28.29 form.
  • This embodiment can also have an additional one Extension of the discharge route result.
  • Such a front panel 1 can be manufactured step by step.
  • the first step is a first dielectric layer 21 on the glass plate 3 homogeneous thickness applied to which in a second step another dielectric layer 42 or a dielectric plate is applied.
  • this Layer 42 can be sandblasted beforehand or subsequently, for example or the corresponding hole structure can be introduced by baking.
  • the invention can also be used in an alternative embodiment, not shown can be applied in which both discharge electrodes on the back plate are arranged. However, the visible light must cover the phosphor layers penetrate.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Gas-Filled Discharge Tubes (AREA)
EP99200443A 1998-02-27 1999-02-17 Plasmabildschirm Expired - Lifetime EP0939421B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19808268 1998-02-27
DE19808268A DE19808268A1 (de) 1998-02-27 1998-02-27 Plasmabildschirm

Publications (3)

Publication Number Publication Date
EP0939421A2 EP0939421A2 (de) 1999-09-01
EP0939421A3 EP0939421A3 (de) 1999-11-17
EP0939421B1 true EP0939421B1 (de) 2003-11-26

Family

ID=7859080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99200443A Expired - Lifetime EP0939421B1 (de) 1998-02-27 1999-02-17 Plasmabildschirm

Country Status (4)

Country Link
US (1) US6476554B1 (ja)
EP (1) EP0939421B1 (ja)
JP (1) JPH11317171A (ja)
DE (2) DE19808268A1 (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1296347B1 (en) * 1998-07-22 2004-09-15 Matsushita Electric Industrial Co., Ltd. Plasma display panel, method of manufacturing the same, and display device using the same
KR100322071B1 (ko) * 1999-03-31 2002-02-04 김순택 플라즈마 표시장치 및 그의 전계집중부를 가진 유전체층 제조방법
WO2001035437A1 (fr) 1999-11-11 2001-05-17 Matsushita Electric Industrial Co., Ltd. Procede et dispositif de production de panneaux a decharge electrique gazeuse
JP2001345052A (ja) * 2000-05-31 2001-12-14 Nec Corp Ａｃ型プラズマディスプレイパネルおよびその駆動方法
JP3442069B2 (ja) * 2001-05-28 2003-09-02 松下電器産業株式会社 プラズマディスプレイパネル、その製造方法及び転写フィルム
US7288892B2 (en) * 2002-03-12 2007-10-30 Board Of Trustees Of The Leland Stanford Junior University Plasma display panel with improved cell geometry
FR2855646A1 (fr) * 2003-05-26 2004-12-03 Thomson Plasma Panneau de visualisation a plasma a zone d'expansion de decharge de section reduite
US7230378B2 (en) * 2004-08-12 2007-06-12 Au Optronics Corporation Plasma display panel and method of driving thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR920000933B1 (ko) * 1989-07-28 1992-01-31 삼성전관 주식회사 평면 방전형 칼라 방전 표시 패널
JPH03226943A (ja) * 1990-01-31 1991-10-07 Hitachi Ltd ガス放電パネル
JPH05234520A (ja) * 1992-02-21 1993-09-10 Nec Corp Ａｃ面放電型プラズマディスプレイパネル
JPH0684468A (ja) * 1992-09-01 1994-03-25 Dainippon Printing Co Ltd Ｄｃ型プラズマディスプレイパネル
JP3224486B2 (ja) * 1995-03-15 2001-10-29 パイオニア株式会社 面放電型プラズマディスプレイパネル
US5982095A (en) 1995-09-19 1999-11-09 Lucent Technologies Inc. Plasma displays having electrodes of low-electron affinity materials
JP3433032B2 (ja) * 1995-12-28 2003-08-04 パイオニア株式会社 面放電交流型プラズマディスプレイ装置及びその駆動方法
JPH10275563A (ja) * 1997-03-31 1998-10-13 Mitsubishi Electric Corp プラズマディスプレイパネル

Also Published As

Publication number Publication date
DE59907827D1 (de) 2004-01-08
DE19808268A1 (de) 1999-09-02
US6476554B1 (en) 2002-11-05
EP0939421A3 (de) 1999-11-17
EP0939421A2 (de) 1999-09-01
JPH11317171A (ja) 1999-11-16

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