EP0923106A1 - Electrodes pour afficheur électronique - Google Patents

Electrodes pour afficheur électronique Download PDF

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Publication number
EP0923106A1
EP0923106A1 EP97403002A EP97403002A EP0923106A1 EP 0923106 A1 EP0923106 A1 EP 0923106A1 EP 97403002 A EP97403002 A EP 97403002A EP 97403002 A EP97403002 A EP 97403002A EP 0923106 A1 EP0923106 A1 EP 0923106A1
Authority
EP
European Patent Office
Prior art keywords
electrode
bus
conductive
display
microns
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Withdrawn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
EP97403002A
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German (de)
English (en)
Inventor
Jerome Davidovits
Laurent Guiziou
Bernard Eid
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.)
Corning Inc
Original Assignee
Corning Inc
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 Corning Inc filed Critical Corning Inc
Priority to EP97403002A priority Critical patent/EP0923106A1/fr
Publication of EP0923106A1 publication Critical patent/EP0923106A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • H01J11/22—Electrodes, e.g. special shape, material or configuration
    • H01J11/24—Sustain electrodes or scan electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/24—Sustain electrodes or scan electrodes
    • H01J2211/245—Shape, e.g. cross section or pattern

Definitions

  • the present invention relates to a new electrode design for use in electronic displays, in particular to electrode designs which are useful as display electrodes for the front plate of a plasma display panel.
  • FIG. 1 is a plane view of an arrangement of display electrodes X and Y in an image element EG and Fig. 2 is a schematic perspective view of a structure of an image element.
  • This display device comprises pairs of lines of display electrodes X and Y; lines of address electrodes 22 insulated from the display electrodes X and Y and running in a direction intersecting the lines of display electrodes X and Y; areas of three phosphor layers 28R, 28G and 28B different from each other in luminescent color, facing the display electrodes.
  • a discharge gas is retained in a space 30 between the display electrodes X and Y and the phosphors, such that the adjacent three phosphor layers of the three different luminescent colors 28R, 28G and 28B in a pair of lines of display electrodes X and Y define one pixel or image element EG of a full color display, as shown in Fig. 1.
  • only one display electrode pair i.e., two display electrodes, is arranged in one image element.
  • a three electrode type surface gas discharge AC plasma display panel that comprises a front plate glass substrate 11 on the side of the display surface H, a pair of display electrodes X and Y extending transversely parallel to each other; a dielectric layer 17 for an ac drive; a protecting layer 18 of MgO; a glass substrate 21 on the background side; a plurality of barriers 29 extending vertically and defining the pitch of discharge spaces 30 by contacting the top thereof with the protecting layer 18; address electrodes 22 disposed between the barriers 29; and phosphor layers 28R, 28G and 28B of three primary colors of red R, green G and blue B.
  • the discharge spaces 30 are defined as unit luminescent areas EU by the barriers 29 and are filled with a penning gas, for example a mixture of neon with xenon (about 1-15 mole %) at a pressure of about 500 Torr as an electric discharge gas emitting ultra-violet rays for exciting the phosphor layers 28R, 28G and 28B.
  • a penning gas for example a mixture of neon with xenon (about 1-15 mole %) at a pressure of about 500 Torr as an electric discharge gas emitting ultra-violet rays for exciting the phosphor layers 28R, 28G and 28B.
  • Each of the display electrodes X and Y comprises a transparent conductor strip 41, and a metal layer 42 for supplementing the conductivity of the transparent conductor strip 41.
  • the transparent conductor strip 41 can be, for example, a tin oxide layer (indium tin oxide-ITO or fluorine tin oxide-FTO) and the metal layers 42 can be, for example, a Cr/Cu/Cr three sublayer structure, or other conductive metal such as silver or aluminum.
  • the transparent conductor strip 41 could have a width which varies from, for example, 40-300 microns wide, and the metal layer 42 can have a width L 2 which varies from, for example, 30-100 microns wide.
  • the distance between a pair of the display electrodes X and Y i.e., the discharge gap, is selected to be about 40-150 ⁇ m and an MgO layer 18 about a few hundred nano meters thick is formed on the dielectric layer 17.
  • the interruption of a discharge between adjacent display electrode pairs, or lines, L can be prevented by providing a predetermined distance between the adjacent display electrode pairs, or lines, L.
  • the phosphors 28R, 28G and 28B are disposed in the order of R, G and B from the left to the right to cover the surfaces of the substrate 21 and the barriers 29 defining the respective discharge spaces there-between.
  • the phosphor 28R emitting red luminescence can be, for example, (Y, Gd)BO 3 :Eu 2+ .
  • the compositions of the phosphors 28R, 28G and 28B are selected such that the color of the mixture of luminescence of the phosphors 28R, 28G and 28B when simultaneously excited under the same conditions is white.
  • a selected discharge cell for selecting display or nondisplay of the unit luminescent area EU is defined.
  • a primary discharge cell is defined near the selected discharge cell by a space corresponding to the phosphor.
  • respective image elements EG are comprised of three unit luminescent areas EU arranged transversely and having the same areas.
  • the image elements advantageously have the shape of a square for high image quality and, accordingly, the unit luminescent areas EU have a rectangular shape elongated in the vertical direction, for example, about 660 ⁇ mX220 ⁇ m.
  • a pair of display electrodes are made corresponding to each image element EG, namely, one image element EG corresponds to one line L.
  • the displayed picture is produced by plasma discharges which are induced locally in the penning gas by applying a suitable voltage between address electrodes 22 and the electrode pairs X and Y which make up each sustain or display electrode. This causes a gas discharge to occur in the area immediately surrounding the display electrodes X and Y. The gas discharge induces luminescence of the phosphors which produces a colored light to be emitted.
  • the front plate electrode geometry consists of a plurality of display electrodes, each consisting of an electrode pair X and Y. Because light is emitted out of the front plate and to the eyes of the viewer, it is desirable to block as little of the light emitted by the phosphor luminescence as possible. Consequently, it would be desirable to make the electrodes X and Y entirely out of a highly transparent conductive material, such as ITO or FTO. However, the conductivity of such transparent conductive materials is not high enough to operate as an electrode material over the relatively long panel lengths desired (i.e., lengths of 30 inches or more).
  • a metallic bus electrode 42 has typically been employed to help distribute the current over the entire length of the transparent conductive strip 41, thereby effectively minimizing the distance current has to travel across the transparent conductive strip film to the width of the transparent conductive strip (typically about 160 microns).
  • Such metallic bus electrodes (which are typically made of aluminum or some other conductive metal) are obviously not transparent. However, if the metal buses are made thin enough, enough emitted light will be transmitted through the front plate for the display to operate effectively.
  • This type of sustain electrode configuration involves printing photoresist masks on the substrate and selectively etching the desired pattern for both the transparent conductive strip and the conductive metal bus.
  • the process for making the front plate electrodes is thus technologically difficult due to the need to register the second mask with respect to the location of the first mask, as well as the need to employ etching processes.
  • One aspect of the present invention relates to a new configuration of display electrodes suitable for use in the front plate of an AC plasma display panel by employing a plurality of metallic electrodes (rather than a single metallic bus electrode) for each one of the pair of display electrodes employed in an alternating current plasma display.
  • each display electrode is comprised of three metallic buses approximately 20 microns wide rather than a single metallic electrode 60 microns wide.
  • Each of the three metallic bus members are spread over an area equal to that of the previously employed transparent conductive layer, that is, for example, about 160 microns. Two such electrodes are employed as each display electrode pair.
  • the total width of each display electrode (X and Y) thus remains the same (i.e. about 60 microns), as well as the gap between each display electrode (about 75 microns).
  • the metallic bus electrode designs of the present invention are capable of obtaining relatively the same luminescence as prior art configurations which utilized both a metallic bus and a transparent conductive coating.
  • the designs of the present invention are also capable of exhibiting the same line resistance as the prior art configurations.
  • manufacture of the display electrodes is facilitated by elimination of process steps needed to both deposit the conductive transparent layer and etch it to have its desired configuration.
  • Figs. 3 and 4 illustrate a full color flat panel AC plasma display device in accordance with the invention.
  • the display device illustrated in Figs. 3 and 4 is identical to the display device illustrated in Figs. 1 and 2, with the exception that the pairs of lines of display electrodes X and Y are comprised of pluralities of bus electrodes 42, and these display electrodes X and Y do not utilize a transparent conductor strip 41 (as was the case in Figs. 1 and 2).
  • the bus electrodes 42 are comprised of conductive metallic strips 42 arranged generally parallel to one another and running the width or length of the display.
  • These strips could be made, for example, from one or more of the metals selected from the group consisting of aluminum, silver, chrome, copper, nickel, gold, zinc, and alloys or multilayers thereof.
  • three bus electrodes 42 are employed to make up each bus structure. Two such bus structure make up an AC electrode pair X and Y.
  • the display device illustrated in Figs. 3 and 4 comprises pairs of lines of display electrodes X and Y; lines of address electrodes 22 insulated from the display electrodes X and Y and running in a direction intersecting the lines of display electrodes X and Y; areas of three phosphor layers 28R, 28G and 28B different from each other in luminescent color, facing the display electrodes.
  • a discharge gas is retained in a space 30 between the display electrodes X and Y and the phosphors, such that the adjacent three phosphor layers of the three different luminescent colors 28R, 28G and 28B in a pair of lines of display electrodes X and Y define one image element EG of a full color display, as shown in Fig. 3.
  • the surface gas discharge AC plasma display panel illustrated comprises a front plate glass substrate 11 on the side of the display surface H, a pair of display electrodes X and Y in accordance with the invention extending parallel to each other; a dielectric layer 17 for an ac drive; a protective layer 18 of MgO; a glass substrate 21 on the background side; a plurality of barriers 29 extending vertically and defining the pitch of discharge spaces 30 by contacting the top thereof with the protecting layer 18; address electrodes 22 disposed between the barriers 29; and phosphor layers 28R, 28G and 28B of three primary colors of red R, green G and blue B.
  • the discharge spaces 30 are defined as unit luminescent areas EU by the barriers 29 and are filled with a penning gas, for example a mixture of neon with xenon (about 1-15 mole %) at a pressure of about 500 Torr as an electric discharge gas emitting ultra-violet rays for exciting the phosphor layers 28R, 28G and 28B.
  • a penning gas for example a mixture of neon with xenon (about 1-15 mole %) at a pressure of about 500 Torr as an electric discharge gas emitting ultra-violet rays for exciting the phosphor layers 28R, 28G and 28B.
  • Each of the display electrodes X and Y comprises a plurality of metal bus members 42 capable of being operated at the same voltage. This can be achieved, for example, by connecting the bus members at one end, as will be discussed further below with respect to Figure 8 and 9, to form a metallic electrode bus structure.
  • the metal bus members 42 can be, for example, a Cr/Cu/Cr three sublayer structure, or other conductive metal such as, for example silver or aluminum.
  • no transparent conductive layer is employed, i.e., the metallic electrode bus structures are deposited directly onto the glass substrate surface.
  • the total width of the metallic buses which make up each display electrode X and Y preferably remains about the same as in prior art designs, i.e. between about 30 to 100 ⁇ m.
  • These electrode bus members 42 can be distributed over an area ranging from 30 to 100 microns.
  • each of the three metal buses 42 which make up each display electrode X and Y may be designed to be about 20 microns wide, for a total display electrode width of about 60 microns for each of the display electrodes X and Y.
  • the electrode bus structures of the present invention could be formed using various depositions techniques, including, for example, screen printing and other conventional deposition techniques for making thin conductive lines of conductive (e.g. metal) material.
  • bus structures can be deposited from a recessed pattern which corresponds to the desired electrode bus structure pattern.
  • one embodiment of the present invention thus consists in removing the transparent conductive layer and instead employing two or more narrow metallic bus members, as shown in Figs. 5 and 6.
  • the total width L 2 of the metallic buses which make up each display electrodes X and Y can remain about the same as a prior art design it is meant to replace.
  • the global width L 1 of one sustain electrode can remain about the same as the particular prior art design it is meant to replace.
  • such a design (which corresponds to the design illustrated in Figs.
  • each of these sustaining X and Y is comprised of three metallic bus members 42, each 20 microns wide, thereby achieving a total width L 2 for each display electrode X and Y of 60 microns.
  • the global width L 1 of each of these sustaining X and Y can be, for example, about 175 microns.
  • the distance between a pair of display electrodes X and Y i.e., the discharge gap, is selected to be about 40 to 150 microns.
  • Dielectric layer 17 is preferably about 20 microns thick.
  • MgO layer 18 about a few hundred nanometers thick is formed on the dielectric layer 17. The interruption of a discharge between adjacent display electrode pairs, or lines, L can be prevented by providing a predetermined distance between the adjacent display electrode pairs, or lines, L.
  • Fig. 7 illustrates a perspective view of the front plate for a display electrode employing three metallic buses.
  • the three buses 42 that make up each electrode in the pair of display electrodes X and Y are connected at electrode connector 43 at the extremities of the display and thus are operated at the same voltage.
  • the materials employed to form the metallic buses 42 can be adjusted to achieve a line resistance of the electrode similar to that in prior art configurations.
  • the multi-bus-member sustain electrode designs of the present invention can be deposited over or in addition to a transparent conductive material. By doing so, it is believed that the plasma discharge achieved will be enhanced (i.e. it will be brighter).
  • the metallic buses 42 employed to form electrode grids are interconnected as illustrated in Figures 8 and 9.
  • line breakages in metallic bus members are less likely to result in dead display lines (i.e. areas where no current is traveling).
  • the lines connecting metallic bus members 42 are in line with one another, whereas in Fig. 9, the lines connecting individual metallic bus members 42 are staggered (combinations of both could also be employed).
  • the bus members are interconnected along lines which are parallel with the barrier ribs 29.
  • interconnecting lines are not visible to the viewer of the display, nor do they contribute to interference with the light which is emitted from the display.
  • metal bus designs illustrated in Figs. 8 and 9 are not to the scale that would be desired for an electronic display. In an actual display, a great many more interconnecting members would likely be employed. If desired, such interconnecting bus lines could be employed between each and every pixel, if desired. Alternatively, fewer interconnecting lines could also be successfully employed.
EP97403002A 1997-12-11 1997-12-11 Electrodes pour afficheur électronique Withdrawn EP0923106A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97403002A EP0923106A1 (fr) 1997-12-11 1997-12-11 Electrodes pour afficheur électronique

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Application Number Priority Date Filing Date Title
EP97403002A EP0923106A1 (fr) 1997-12-11 1997-12-11 Electrodes pour afficheur électronique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1065695A1 (fr) * 1999-07-02 2001-01-03 Sony Corporation Dispositif plat de visualisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0922656A (ja) * 1995-07-06 1997-01-21 Fujitsu Ltd Ａｃ型ガス放電パネル、およびそれに用いる電極基板と電極基板の製造方法
US5674553A (en) * 1992-01-28 1997-10-07 Fujitsu Limited Full color surface discharge type plasma display device
EP0802556A2 (fr) * 1996-04-17 1997-10-22 Matsushita Electronics Corporation Panneau d'affichage à plasma encourant alternatif

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674553A (en) * 1992-01-28 1997-10-07 Fujitsu Limited Full color surface discharge type plasma display device
JPH0922656A (ja) * 1995-07-06 1997-01-21 Fujitsu Ltd Ａｃ型ガス放電パネル、およびそれに用いる電極基板と電極基板の製造方法
EP0802556A2 (fr) * 1996-04-17 1997-10-22 Matsushita Electronics Corporation Panneau d'affichage à plasma encourant alternatif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 097, no. 005 30 May 1997 (1997-05-30) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1065695A1 (fr) * 1999-07-02 2001-01-03 Sony Corporation Dispositif plat de visualisation
US6541913B1 (en) 1999-07-02 2003-04-01 Sony Corporation Flat display apparatus

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