WO2004001786A2 - Dalle de decharges coplanaires pour panneau de visualisation a plasma apportant une distribution de potentiel de surface adaptee. - Google Patents
Dalle de decharges coplanaires pour panneau de visualisation a plasma apportant une distribution de potentiel de surface adaptee. Download PDFInfo
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- WO2004001786A2 WO2004001786A2 PCT/EP2003/050243 EP0350243W WO2004001786A2 WO 2004001786 A2 WO2004001786 A2 WO 2004001786A2 EP 0350243 W EP0350243 W EP 0350243W WO 2004001786 A2 WO2004001786 A2 WO 2004001786A2
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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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
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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
- H01J11/20—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
- 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
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- 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 invention relates to the delimitation of zones of ignition, of expansion and of stabilization of discharges in the various cells or zones of discharges of a plasma display panel.
- a plasma panel is generally provided with at least a first and a second network of coplanar electrodes whose general directions are parallel, where each electrode Y of the first network is adjacent to an electrode Y 'of the second network, is paired with it , is intended to serve a set of discharge zones, and includes, for each discharge zone served:
- a conductive zone Z a called discharge ignition which comprises an ignition edge facing said electrode of the second network
- slabs are used to manufacture conventional plasma panels of the type comprising a slab 11 of coplanar discharges of the aforementioned type and another slab 12 provided with a network of addressing electrodes, providing between them a two-dimensional assembly bringing together said zones. landfills filled with landfill gas.
- Each discharge zone is positioned at the intersection of an addressing electrode X and a pair of electrodes of the coplanar discharge plate Y, Y '; each set of discharge zones served by the same pair of electrodes generally corresponds to a horizontal line of dump or sub-pixel areas of the panel; each set of discharge zones served by the same addressing electrode generally corresponds to a vertical column of discharge zones or sub-pixels.
- the electrode arrays of the coplanar discharge slab are coated with a dielectric layer 13 to provide a memory effect, itself coated with a layer 14 of protection and emission of secondary electrons, generally based on magnesia. .
- the adjacent discharge zones are generally delimited by horizontal barriers 15 and / or vertical 16; these barriers generally also serve as spacers between the slabs.
- the cell shown in Figures 1A and 1B is rectangular in shape; other cell geometries are disclosed by the prior art; the largest dimension of this cell extends parallel to the addressing electrodes X; let Ox be the longitudinal axis of symmetry of this cell; at each discharge zone served by a pair of electrodes which forms a discharge cell, the portions or elements of electrodes Y, Y 'delimited by the barriers 15, 16 have here a constant width measured in the direction perpendicular to the Ox axis.
- the walls of the light discharge zones are generally partially coated with phosphors sensitive to the ultraviolet radiation of the light discharges; adjacent discharge zones are provided with phosphors emitting different primary colors, so that the association of three adjacent zones forms a picture element or pixel.
- each line of the panel is successively addressed by depositing electric charges on the dielectric layer zone of each discharge zone of this line which has been preselected and whose corresponding sub-pixel must be activated to view the image; - Then, by applying series of maintenance voltage pulses between the electrodes of the two networks of the coplanar discharge slab, discharges are produced only in the previously charged zones, which activates the corresponding sub-pixels and allows the image viewing.
- FIG. 15 of the document EP0782167 - PIONEER and FIG. 3A below show a coplanar discharge slab of the aforementioned type where, at each discharge zone served by a pair of electrodes, each electrode of this pair comprises an element T-shaped comprising a crossbar 31 facing the other electrode and a central leg of constant width 32; each electrode element is electrically connected by a conductive bus 33 by the foot of its central leg.
- Each cross bar 31 of an electrode element forms a discharge ignition zone Z a
- each central leg 32 forms a discharge expansion zone Z b
- each cross bar 33 can form a discharge stabilization zone Z c ; in fact, during operation, during the maintenance phases, each discharge starts at one of the so-called ignition edges of the crossbar 31, then extends along the corresponding leg 32 to the bus 33 at which it is connected.
- T shape is shown in Figure 14 of the same document EP0782167 -PIONEER: it is the inverted U shape which has two side legs (instead of a central one) perpendicular to the same crossbar d 'ignition as before, which are each connected to one end of this bar; after ignition, the discharge is subdivided and then extends along two parallel lateral expansion paths, each corresponding to a leg of the inverted U, the two paths meeting at the level of the conductive bus of the electrode.
- each lateral leg of U 42a, 42b is shared between two adjacent cells and the transverse bars of the elements of the same electrode form a continuous conductor, so that each coplanar electrode has the form of a ladder, the first upright of which serves as an ignition zone Z a , the bars are positioned at the edge of the discharge zone and serve as zones for expanding the discharges Z b , and a second upright serving as the stabilization zone Z c .
- Such a process of spreading the discharges along an expansion zone forming an electrode portion is favorable to the production yield of ultraviolet radiation from the discharges and to a wider distribution of the surfaces of excited phosphors.
- the object of the invention is to define a new type of plasma panel cell with coplanar discharges which makes it possible to further and optimally improve the light output of the discharges and the lifetime of a plasma panel.
- the subject of the invention is a coplanar discharge slab for delimiting discharge zones in a plasma display panel, which comprises:
- the electrode element acts as a cathode
- the surface of the dielectric layer which covers it is positively charged.
- the two opposite electrode elements and the underlying dielectric layer are identical and symmetrical with respect to the center of the inter-electrode space.
- each of the two electrode elements serves alternately to anode and cathode.
- each coplanar maintenance discharge in this panel then successively comprises an ignition phase, an expansion phase, and an end of discharge or stabilization phase during which the cathode sheath of the discharge respectively does not not move, move, disappear or stabilize.
- Each electrode element of each discharge zone in this panel then conventionally comprises:
- a conductive discharge ignition zone Z a which comprises said ignition edge, and which corresponds to the zone of the dielectric layer on which the ions of a discharge are deposited during said ignition phase when said element plays on cathode role,
- a conductive end of discharge or stabilization zone Z c situated behind said expansion zone Z b which comprises said end of discharge edge and which corresponds to the zone of the dielectric layer on which the ions of a discharge are deposited during said end of discharge or stabilization phase when said element acts as a cathode.
- Such electrode elements and the underlying dielectric layer allow the maintenance discharges to spread rapidly from the ignition zone to the end of discharge or stabilization zone, with a minimum of dissipation of energy in the ignition zone, and a maximum of energy dissipation in the high efficiency end-of-discharge zone, while using conventional maintenance generators delivering, between the electrodes of the different pairs, conventional series of maintenance voltage pulses, where each pulse comprises a constant voltage plateau, without pronounced increase in the applied electrical potential.
- the subject of the invention is a coplanar discharge panel for a plasma display panel which comprises, for each discharge zone, at least two electrode elements which have an axis of symmetry Ox and which are adapted so that the surface potential V (x) evaluated at the surface of the dielectric layer covering these elements increases, moving away from the discharge edge of the elements, in a continuous or discontinuous manner, without decreasing part, when a difference of constant potential between the two electrodes serving said discharge zone.
- a coplanar slab according to the invention makes it possible to obtain plasma panels with improved light output and lifespan.
- V n -bc V n _ ab V n . ab > 0.9, and (V n . bc - V n . ab ) ⁇ 0, 1.
- the stable operating point of the discharge cannot be the ignition zone once the discharge has started, and, once initiated, the discharge necessarily spreads in the expansion zone along the surface of the dielectric layer towards the end of discharge edge.
- the invention also relates to a plasma panel provided with a coplanar slab according to the invention.
- the invention also relates to a coplanar discharge panel for delimiting discharge zones in a plasma display panel, which comprises:
- a coplanar slab with increasing distribution of the surface potential of the dielectric layer is thus obtained.
- the width W e (x) or W a (x) of the electrode element delimiting said straight elementary bar may be discontinuous, for example when said element is subdivided into two lateral conductive elements; we then take the sum of the width of each lateral conductive element.
- a maximum energy dissipation of the discharges is then advantageously obtained in the end of discharge zone Z c with high light output.
- the invention also relates to a plasma panel provided with a coplanar panel with increasing specific capacity according to the invention.
- the invention also relates to a plasma panel comprising:
- a coplanar slab for delimiting discharge zones which comprises at least first and second arrays of coplanar electrodes which are coated with a dielectric layer and whose general directions are parallel, where each electrode of the first array is adjacent to a electrode of the second network, is paired with it, is intended to serve a set of discharge zones,
- the width W e (x) of said electrode element is constant in said range of values of x.
- the values of R (x) for all x such that x c ⁇ x ⁇ x cd . are strictly greater than the values of R (x) for all x such that 0 ⁇ x ⁇ x ⁇ .
- the values of R (x) for all x such that x bc ⁇ x ⁇ x c . are strictly greater than the values of R (x) for all x such that 0 ⁇ x ⁇ x ab .
- the subject of the invention is also a coplanar slab with the specific longitudinal capacity C (x) of increasing dielectric layer as defined above where, for each electrode element of each discharge zone, said dielectric layer has a dielectric constant P1 constant and of thickness E1 expressed in constant micrometer above said electrode element at least for all x such that x ab ⁇ x ⁇ x bc , and where, if we define:
- W e -i d -o () W e . ab . exp ⁇ 29. V (P1 / E1).
- the width W e . ab is less than or equal to 80 ⁇ m.
- the width W e . ab is less than or equal to 50 ⁇ m, which advantageously limits the amount of energy dissipated at the start of discharge when such a panel is incorporated into a plasma panel.
- Oy is an axis transverse to the axis Ox which extends along the ignition edge
- d e _ p (x) the distance, measured parallel to the axis Oy at any position x between x ab and x bc , between the edges facing each other of these two lateral conductive elements
- - d e _ p (x ab ) is between 100 ⁇ m and 200 ⁇ m.
- the invention also relates to a coplanar discharge panel for delimiting discharge zones in a plasma display panel, which comprises:
- said electrode element is subdivided into two lateral conductive elements which are symmetrical with respect to the axis Ox and which are disjoint at least in an area where x is included in an interval [x ab , x b3 ],
- said electrode element comprises a so-called ignition transverse bar which connects said lateral conductive elements, one edge of which corresponds to said ignition edge, and the length of which, measured along the axis Ox, is greater than d a value ⁇ L a for
- the electrode element then comprises a lug in the center of the ignition crossbar positioned between the two lateral conductive elements.
- e (x ab ) W e . ab
- the invention also relates to a plasma panel provided with a coplanar slab where the profile of all the electrode elements is in accordance with the invention.
- the subject of the invention is also a plasma panel comprising a coplanar slab and a so-called addressing slab delimiting between them discharge zones and being distant by a height H c , ... the coplanar slab comprising:
- the addressing panel comprising:
- p0 which are symmetrical with respect to the axis Ox and disjoint in a zone where x is included in an interval [x ab , x bc ], and in that, if Oy is an axis transverse to the axis Ox which s' extends along the ignition edge, if called d e .
- p (x) the distance, measured parallel to the axis Oy at any position x between x ab and x bc , between the edges facing one another of these two lateral conductive elements, d e .
- p (x) increases continuously or discontinuously as a function of x in said interval [x ab , x c ], and in that, if we consider the mean line of each lateral conductive element drawn, for a position x given, halfway between the lateral edges of this lateral element, in the zone where x a ⁇ x ⁇ x bc , the tangent in x to the mean line of this element makes with the axis Ox an angle between 20 ° and 40 °, and in that d e . p (x ab ) ⁇ 350 ⁇ m.
- the electrostatic influence of one lateral conducting element on the other is strong enough here to allow, in accordance with the invention, a variation of the standard potential at the surface of the dielectric between V n . preferably higher than 0.9 and V n. bc preferably close to 1, while keeping the width of each lateral conductive element constant.
- said electrode element comprises a so-called ignition transverse bar which connects said lateral conductive elements, one edge of which corresponds to said edge d , and whose length, measured along the axis Ox, is greater by a value ⁇ L a for
- W a is the width of said ignition bar measured along the axis Oy.
- these geometrical characteristics make it possible to reduce the ignition voltage without significantly increasing the dissipation of energy in the cathode cladding at the start of the discharges, in particular because the displacement of this cladding at the time of expansion must be offset laterally, outside the lug area, at each of the lateral conductive elements; increasing the memory charge in the center of the ignition crossbar at this slang will not have an adverse effect on the energy of the cathode sheath.
- the subject of the invention is also a plasma panel comprising a coplanar slab and a so-called addressing slab delimiting between them discharge zones and being distant by a height H c , ... the coplanar slab comprising:
- the addressing panel comprising: a network of addressing electrodes coated with a dielectric layer which are oriented and positioned so as to each cross a pair of electrodes of the coplanar slab at one of said discharge zones,
- said electrode element comprises:
- ignition crossbar whose width is greater than or equal to W c , the length of which measured along the axis Ox is L a , one edge of which corresponds to said ignition edge,
- a crossbar known as a discharge stabilization whose width is greater than or equal to W c , whose length measured along the axis Ox is L s , one edge of which corresponds to said end of discharge edge,
- one of the edges of the intermediate cross-bar being remote from d j from said discharge stabilizing bar and the other edge being spaced from d 2 of said ignition bar was ad 2/2 ⁇ â ⁇ ⁇ d 2 .
- This characteristic makes it possible to advantageously conserve a surface potential of the dielectric layer in the ignition zone identical to the surface potential at the start of the expansion zone.
- this panel comprises a network of parallel barriers arranged between said slabs at a distance W c from each other perpendicular to the general direction of said coplanar electrodes, characterized in that, if Oy is an axis transverse to the axis Ox which extends along the ignition edge and if W a is the width of said ignition transverse bar measured along the axis Oy, we have: W c -60 ⁇ m ⁇ W a ⁇ W c -100 ⁇ m.
- the plasma panel comprises a network of parallel barriers arranged between said tiles at a distance W c from each other perpendicular to the general direction of said electrodes coplanar, characterized in that, if Oy is an axis transverse to the axis Ox which extends along the ignition edge, if W a is the width of said ignition transverse bar measured along the axis Oy, if W a . min corresponds to the width beyond which said barriers cause a significant reduction in surface potential of the dielectric layer above said element, said ignition crossbar comprises:
- the reduction of the gap separating the two electrode elements at the level of the lateral zones Z a . pl , Z a . p2 near the barriers increases the electric field in this area and compensates for the reduction of primary particles resulting from the wall effect by locally adapting the Pashen conditions. There is thus obtained a reduction in the ignition potential, with a constant ignition zone surface, or a reduction in the ignition zone surface with a constant ignition potential.
- one or the other of the plasma panels according to the invention comprises supply means suitable for generating between the coplanar electrodes of the different pairs of series of so-called maintenance voltage pulses with constant stages.
- the invention advantageously makes it possible to appreciably increase the light output and the lifetime of the plasma panels by using this conventional and economical type of maintenance generator.
- FIG. 2A represents the state of a discharge at time T1 and at time T2 in a cell of the type of FIG. 1A and 1 B
- FIG. 2B represents the evolution of the discharge current as a function of time T;
- FIG. 3A shows, in top view, a second structure of a cell of the prior art and Figure 3B shows the evolution of the discharge current as a function of time T in this structure;
- FIG. 4A shows, in top view, a third structure of a cell of the prior art and Figure 4B shows the evolution of the discharge current as a function of time T in this structure;
- FIG. 5 shows the distribution of the surface potential of the dielectric layer along the electrode elements of the structures of the prior art of Figures 1 to 4;
- FIG. 6 shows a general perspective view of a plasma panel cell with coplanar slab
- FIG. 7 shows the distribution of the surface potential according to the invention of the dielectric layer along the electrode elements of structures according to the invention described in the following figures;
- FIG. 8 illustrates a first general embodiment of the invention based on a structure where the thickness of the dielectric layer is variable
- FIG. 9 represents the variation of the standard surface potential of the dielectric layer as a function of the width, in arbitrary units, of the electrode element in a cell of a plasma panel;
- FIG. 10A to 10D, 11A to 11 D illustrate variants of a second general embodiment of the invention based on a structure where the electrode element has a variable width
- FIG. 12 shows the variation of the standard ignition potential to be applied between the electrode elements of a cell to obtain the ignition of discharges, as a function of the width of the electrode element in the area of ignition;
- FIG. 13 and 14 show two possible configurations of the ignition edge of electrode elements according to the invention
- FIG. 15A, 15B illustrate variants of the structure according to Figure 10C which are here provided with ignition edges shown in Figures 13 or 14;
- FIG. 16 illustrates other variants of a second general embodiment of the invention based on a structure where the electrode element has a variable width and is subdivided into two lateral conductive elements;
- FIG. 17 shows the variation of the surface potential of the dielectric layer at the center of the cell of Figure 16 as a function of the spacing of the two lateral conductive elements
- FIG. 19 illustrates a variant of a third general embodiment of the invention based on a structure where the electrode element is subdivided into two lateral conductive elements which have a constant width;
- FIG. 20A shows a cell structure with two transverse bars
- FIG. 20B shows a cell structure of the prior art with three transverse bars which illustrates a third general embodiment of the invention
- FIG. 21 shows the distribution of the surface potential of the dielectric layer along the electrode elements of the structures of Figures 20A and 20B;
- each plasma discharge which arises between the electrodes of a pair, one serving as a cathode and the other as anode, comprises an ignition phase and a expansion phase;
- FIG. 2A shows a schematic longitudinal section of a cell of the type with coplanar discharge zone as described in FIG. 1A
- FIG. 2B represents the evolution of the electric current between the coplanar electrodes of this cell during a maintenance discharge.
- the ignition voltage of a discharge obviously depends on the electrical charges previously stored on the anode and the cathode in the vicinity of the ignition zone, in particular during the previous discharge where the cathode was an anode and vice versa; before discharge, positive charges are therefore stored on the anode and negative charges on the cathode; these stored charges create what is called a memory voltage; the ignition voltage corresponds to the voltage applied between the electrodes, or maintenance voltage, plus the memory voltage.
- the electronic avalanche in the discharge gas between the electrodes then creates a positive space charge which concentrates towards the cathode to form what is called the cathode sheath;
- the so-called positive pseudo-column plasma zone located between the cathode cladding and the anode end of the discharge contains in equal proportion positive and negative charges; this zone is therefore conductive of current and the electric field there is weak; the positive pseudo-column zone therefore has a low energy distribution of the electrons and in fact promotes the production of ultraviolet photons by favoring the excitation of the discharge gas.
- the most important part of the electric field in the gas between the anode and the cathode therefore corresponds to the field within the cathode sheath; along the field lines between the anode and the cathode, the largest part of the potential drop corresponds to the cathode cladding zone; the impact of ions, accelerated in the intense field of the cathode cladding, on the magnesia-based layer, which coats the dielectric layer, results in a significant emission of secondary electrons in the vicinity of the cathode; under the effect of this intense electronic multiplication, the density of the conducting plasma then increases sharply between the electrodes, both in ions and in electrons, which causes a contraction of the cathode sheath in the vicinity of the cathode and the positioning of this sheath at the level where the positive charges of the plasma are deposited on the portion of dielectric surface covering the cathode; on the anode side, the plasma electrons, which are much more mobile than ions, are deposited on the portion of
- the distribution of the potential along the longitudinal axis of symmetry Ox on the surface of the dielectric layer covering the cathode is uniform, as explained later in more detail with reference to curve A in FIG. 5
- the potential is thus constant along the axis Ox of expansion of the discharge, there is therefore no transverse electric field allowing the displacement of the cathode sheath.
- the positive charge from the discharge is therefore deposited and therefore gradually accumulates at the level of the ignition zone Z a without there being any displacement of the sheath.
- the ignition zone Z a therefore corresponds to the zone of accumulation of ions at the start of the discharge for the entire time that the cathode cladding of this discharge does not move.
- the ion bombardment is then concentrated on a small surface of the magnesia layer and causes a strong local spraying of said layer.
- a field called "transverse" is created between these positive charges just deposited on the one hand and the negative charges previously deposited.
- this transverse field causes the displacement of the cathodic sheath more and more far from the ignition zone as the ionic charges accumulate on the dielectric surface which covers the cathode; it is this displacement which leads to the expansion of the plasma discharge; the cathode sheath is positioned at the level where the plasma ions are deposited, at the limit of the expansion zone; during discharges, the displacement of the cathode sheath follows the path of the electrode elements in each cell.
- the expansion zone Z b therefore corresponds to the zone swept by the displacement of the cathode cladding of the discharge.
- each electrode element Opposite the ignition edge, each electrode element includes an end of discharge edge.
- the discharge is generally not yet extinguished because the surface potential of the dielectric layer at the end of this displacement still has, compared to the surface potential of the dielectric layer covering the anode, a sufficiently large difference for the maintenance of this discharge; in other words, because the global deposit of ions on the dielectric layer covering the cathode has not yet sufficiently compensated for the potential applied to this cathode; the discharge then continues without displacement of the cathode sheath over a surface area of the cathode corresponding to what is called the stabilization area or the end of discharge area Z c . .
- discharge end zone becomes strictly speaking “stabilization zone” only when, before the start of a discharge, the surface potential of the dielectric layer in this zone is greater than that of the rest of the dielectric layer in the expansion and ignition area. If this is not the case, the end of discharge zone is only the end of the expansion zone, without being strictly speaking a stabilization zone.
- an instant T1 at the end of ignition or at the start of expansion is defined, and an instant T2 at the end of expansion or at the start of stabilization.
- the expansion of the plasma on the surface of the dielectric layer, between the instant T1 and the instant T2 makes it possible to extend the zone of positive pseudo-column of the discharge, therefore to increase the share of electric energy of this discharge which is dissipated for l excitation of the gas in the cell, and therefore improve the yield of production of ultraviolet photons from the discharge.
- the expansion of the discharge also makes it possible to distribute the spray by ion bombardment of the layer of magnesia over a larger surface and to locally reduce the degradation, which increases the lifetime of said layer and, consequently, that of the screens. plasma.
- the quantity of energy dissipated at the instant T2 which corresponds to the electric current 12 at this instant, remains low.
- the totality of the energy dissipated during the discharge only a small part is therefore dissipated during the moments when this discharge is sufficiently large to exhibit a high yield of production of ultraviolet photons and a weak sputtering of the layer of magnesia.
- One way of improving the light output and the lifespan therefore consists in reversing the distribution of the energy dissipated during the discharge process, or in aiming for a ratio H of 12 of minimum value. It is particularly advisable to dissipate the maximum energy in the discharge when it is at its optimal point of expansion, that is to say at the instant T2 when the discharge leaves the expansion zone Z b and enters the stabilization zone Z c .
- the speed of formation of the transverse field allowing the spreading of the discharge on the surface of the dielectric layer covering the cathode depends on the local capacity of the dielectric layer located under the cathode sheath, in the ignition zone as at any point. of the expansion area. The greater this local capacity, the greater the quantity of charges deposited, and the more time required for the growth of the transverse field of displacement of the sheath.
- This local capacity determines the surface potential seen by the landfill; if the local capacity is uniform, there is no transverse electric field and the formation of this transverse electric field depends entirely on the potential difference generated by the charge previously stored on the surface of the dielectric layer coming from the preceding discharge and the charge deposited by the landfill in Classes. In other words, there can only be a transverse field, and therefore a discharge spread, if a sufficient amount of electrical energy is supplied to fully charge the surface of the dielectric layer locally.
- the capacity of the dielectric layer in the stabilization zone Z c should therefore be greater than the capacity of the dielectric layer in any other part of the discharge zone.
- the discharge zone Z b extends along an electrode element which has a uniform width over the entire half cell length, so that the local capacitance of the portion of dielectric layer 13 comprised between this electrode element and the cathode sheath has a constant value at all points of the ignition zone and of the expansion zone, whatever or the position of the cathode sheath during its expansion period, that is to say whatever the state of the discharge.
- this local capacity is always maximum since the electrode element corresponds to the whole of the discharge zone.
- the distribution of the potential on the surface of the dielectric layer covering the electrode element of the discharge zone is represented on the curve A of FIG. 5 at an instant T which immediately precedes the start of the discharge and as a function of the distance x to the ignition edge, measured on the axis Ox of FIG. 1 -A, which is here an axis of longitudinal symmetry of the electrode element of the cell considered.
- This distribution is obtained using 2D modeling software called SIPDP2D version 3.04 from Kinema Software, whose operation is described later.
- this surface potential is uniform and constant over the entire length of the electrode element, since the local capacity of the dielectric layer is constant at all points of the surface of this layer, and there is no transverse electric field favorable to the displacement of the discharge on the surface of the dielectric layer after the ignition phase.
- the discharge current shown in FIG. 2B then has the characteristics described above, according to which a significant part of the electrical energy is dissipated before the transverse field of discharge spreading is sufficiently formed to cause displacement of the sheath, and a small share of electrical energy is dissipated during displacement and at the end of displacement of the sheath, while the discharge reaches the maximum light output.
- the ratio 11 of 12 is then high.
- each electrode element Y or Y ′ has, perpendicular to the axis Ox, a width which is not uniform when it is moved along the mean direction of movement of the cathode sheath of the discharge, ie along the axis Ox.
- the specific longitudinal capacity of the dielectric layer covering an element of a coplanar electrode is called, the capacity of an area of this layer extending along a very small length dx positioned at x on the axis Ox corresponding to a length slice. and extending along a width W e (x) corresponding to that of the electrode element at the same position x on the axis Ox.
- FIG. 3A is strong in the ignition zone Z a where the electrode element is constituted by the first transverse bar 31 , then weak in the expansion zone Z b where the electrode element is constituted by the central leg 32, and finally again strong in the end of discharge zone Z c where the electrode element is formed by the second transverse bar 33.
- the evolution of the intensity I of the electric current of the discharge as a function of the instant T of this discharge is represented in FIG. 3B for the cell structure of FIG. 3A.
- the distribution of the potential V on the surface of the dielectric layer covering the electrode element Y is shown on the curve C in dotted lines in FIG. 5, at an instant preceding the start of a discharge.
- this distribution has a "dip" in the expansion zone, which forms a potential barrier between the ignition zone and the stabilization zone.
- the discharge is initiated above the dielectric surface covering the ignition zone Z a . It has been found that, the expansion zone formed by the jamb 32 between the two transverse bars 31, 33 having in any position x a capacity longitudinal specific weak, the surface potential of the dielectric layer covering this leg was less than or equal to that of the dielectric layer covering the crossbar 31 of the ignition zone, depending on whether the width of this leg 32 is respectively strictly less or greater than the length of the crossbar 31 in the ignition zone in the cell.
- the longitudinal capacity of the electrode element being low in the region of the leg 32 of the expansion zone Z b , the deposition of charges in this zone is rapid, therefore the transverse field necessary for the displacement of the sheath is quickly created at any point in this zone, which favors the rapid displacement of the cathode sheath along the jamb 32 to the second transverse bar or bus 33.
- the width of the leg 32 When the width of the leg 32 is greater than the length of the transverse bar 31 in the cell (which constitutes the ignition zone Z a ), the behavior of the discharge is close to that described for the structure of FIG. 1A (field transverse zero). We are only interested here in cases where the width of the leg 32 is less than or equal to the length of the crossbar of the ignition zone Z a . Furthermore, at the anode, there is, before the start of each discharge, the same type of potential distribution shown in Figure C of Figure 5, which has a potential barrier. The difference in reverse potential generated by the leg 32 disturbs the spreading of the electrons at the anode.
- the electrons no longer spread from the start over the entire anode as in the structure of Figure 1, but only on the part of the anode element which is located upstream of the potential barrier, namely on the part located at the level of the first transverse bar, then, as soon as the charge accumulated on the anode allows to pass the potential barrier, the electrons spread over the rest of the anode quickly and the potential difference between the surface of the dielectric layer located above the anode and the surface of the dielectric layer located above the cathode at the position of the sheath, decreases rapidly.
- the electric field within this sheath decreases rapidly as the deposit charges at the anode, which causes expansion of this sheath, a decrease in the energy of the ions which strike the layer of magnesia, and a decrease in the rate of production of charges on this layer; under the effect of this expansion, the speed of displacement of the cathode sheath in turn decreases, and the discharge is extinguished before having reached the second transverse bar.
- the second transverse bar 33 forming the end of discharge zone Zc having a strong specific longitudinal capacity, the elongated discharge stops on this bar as long as the deposition of charges on the dielectric surface covering the second transverse bar 33 has not completely compensated for the potential applied between the electrodes. This increases the share of electrical energy in the discharge which is dissipated at the end of the expansion period, and the intensity of the electric current 12 increases.
- the ratio 11 of 12 then decreases by increase of 12; nevertheless a large part of the electrical energy of the discharge remains lost in the ignition zone to deposit charges on the dielectric surface and create a transverse field sufficiently strong to allow the passage of the cathode sheath from the first bar 31 to the second crossbar 33, and cross the potential barrier generated by the jamb 32.
- FIG. 4A presents a structure close to that described in FIG. 3A.
- a single leg centered on the Ox axis to connect the same two transverse bars
- the distribution of the potential is obtained, before the start of a discharge, on the surface of the dielectric layer covering the electrode element constituted by these two transverse bars and these two legs; this distribution is presented on curve B1 in FIG. 5.
- the axis Ox corresponds overall to the axis of symmetry of the zone of displacement of the cathode sheath.
- This potential distribution here has a higher potential barrier between the two transverse bars, resulting from the absence of a leg in the center of the discharge zone between said bars.
- the drop in potential between the two bars is nevertheless limited by the presence of the legs 42a, 42b positioned along the walls of the cell.
- the intensity of the electric current I generated by the discharge is presented in FIG. 4B as a function of time T.
- the discharge begins on the surface of the dielectric layer covering the first transverse bar (ignition zone Za) as before, then collides here with the potential barrier caused by the absence of central jamb. As the spreading of electrons at the anode is not possible, the discharge is quickly extinguished.
- the transverse electric field is here opposite to the direction of expansion of the discharge from the front to the rear of the conductive element. To reverse this transverse field, it is necessary to deposit sufficient charges on the first transverse bar so as to compensate for the potential barrier.
- the first part of the discharge therefore takes place at a voltage much higher than the normal operating voltage, with the consequence of a significant contraction of the cathode sheath on the first transverse bar and a significant spraying of the surface of magnesia by ion bombardment and an electric current intensity 11 greater than the intensity 12 of the second discharge.
- the 11 to 12 ratio for this type of discharge is further improved by the formation of a second discharge on the crossbar constituting the end of the expansion zone.
- the invention aims to maintain and control the transverse electric field of displacement of the cathode sheath at a level high enough to rapidly lengthen the discharge while dissipating the minimum of electrical energy, then to stabilize the discharge once extended and dissipate the maximum of electrical energy.
- FIG. 6 schematically represents a discharge zone 3 of rectangular shape delimited between its largest faces by a coplanar slab 1 carrying a pair of symmetrical electrode elements 4, 4 ′ arranged on either side of an inter interval -electrode or gap 5 and by an addressing plate 2 carrying, but not necessarily, an addressing electrode X of general direction perpendicular to the electrode elements 4, 4 ′ and coated with a dielectric layer 7; the ends of the electrode elements opposite the gap are electrically connected to a conductive bus Y c not shown, which serves to supply them with voltage; the coplanar electrodes 4, 4 ′ are coated with a dielectric layer 6.
- the discharge zone 3 is delimited not only by the slabs, but also by barriers arranged perpendicular to the slabs (not shown), and thus forms a discharge cell.
- each electrode element 4, 4 ′ extends along the longest dimension of the cell, namely its length L c ; we call L e the length of each electrode element along this dimension, between its ignition edge and its end of discharge edge; E1 is called the thickness and P1 the relative permittivity of the dielectric layer above each electrode element 4, 4 '; E2 the thickness and P2 the relative permittivity of the dielectric layer above the addressing electrode X or of the slab 2 in the absence of an addressing electrode; the distance H c therefore corresponds to the thickness of gas between the two slabs 1 and 2; the electrode elements 4, 4 'described in the figure are T-shaped as in the prior art.
- Ox is an axis located on the surface of the coplanar slab in the longitudinal plane of symmetry of the cell, which extends towards the end of discharge edge ;
- Oy is an axis, also located on the surface of the coplanar slab, generally transverse to the Ox axis, which extends along the ignition edge towards a side wall of the cell, and
- Oz is an axis perpendicular to the surface of the coplanar slab which extends in the direction of the opposite slab of the plasma panel.
- the invention mainly proposes to adjust the specific longitudinal capacity of the dielectric layer covering the coplanar electrode elements of each cell so as to create, before the start of each discharge, a positive or zero transverse electric field at any point of the expansion zone allowing the discharge to spread rapidly from the ignition zone to the end of discharge or stabilization zone, with a minimum of energy dissipation in the ignition zone, and a maximum of energy dissipation in the high efficiency end discharge zone Z c , while using conventional maintenance generators delivering, between the electrodes of the different pairs, classic series of maintenance voltage pulses, where each pulse comprises a constant voltage plateau, without pronounced increase in the applied electrical potential.
- this growth in potential can be continuous as explained below with reference to curve C in FIG. 7, or discontinuous by potential jumps, with at least one, preferably two, potential steps between the start and the end of the expansion zone.
- the dotted curve C in FIG. 7 gives an example of continuous growth of the potential corresponding to such a strictly positive field over the entire dielectric surface of the slab 1 corresponding to the expansion zone Z c ; this example will be developed later with reference to FIG. 8: if ⁇ V is the potential difference of the surface of the dielectric layer between the start x ab and the end x bc of the expansion zone, this difference is distributed according to the invention along this interval so as to generate at any point of this interval, and this for the same potential applied at any point of the electrode element 4 under the surface of the dielectric layer, a positive electric field oriented in the direction Ox towards the end x bc of the expansion zone located opposite the ignition edge.
- the end of the ignition zone x ab is less than L e / 3 and the start of the end of discharge zone x bc is greater than L e / 2; in addition, the length of the expansion zone (x bc -x ab ) represents more than a quarter of the total length L e of the electrode element, preferably more than half of this length.
- - ⁇ V is less than 10% of the highest potential V max of the surface of the dielectric layer along the axis Ox; the upper limit of the potential difference ⁇ V is intended to limit the penalizing increase in the ignition potential of the discharges below 20% of the voltage which should be applied to obtain a discharge in a cell of identical structure but with longitudinal capacity constant specific according to the prior art; preferably, a value of ⁇ V is chosen corresponding to approximately 5% of the highest potential of the surface of the dielectric layer along the axis Ox.
- the total capacity of the dielectric layer corresponding to the stabilization zone Z c between x c and x cd is strictly greater than the total capacity of the dielectric layer corresponding to the ignition zone Z a located between 0 and x ab .
- the specific longitudinal capacity of the dielectric layer in the stabilization zone Z c is greater than the specific longitudinal capacity of the dielectric layer at any other point in the expansion zone Z b and in the ignition zone Z a ; a maximum of energy dissipation is thus obtained in the high efficiency end-discharge zone Z c .
- the standard surface potential V norm is defined as the ratio between the surface potential V at a level x of the dielectric layer for the electrode element considered and the potential maximum possible along the axis Ox for an electrode element of infinite width, ie greater than the width W c of the cell.
- the positive charges are deposited on the surface portion of the dielectric layer located under the cathode sheath, and the cathode sheath is rapidly set in motion under the effect of the transverse electric field created by the potential difference ⁇ V, so that l the intensity of the initial discharge current 11 remains low, and that the share of electrical energy of the discharge which is dissipated in the first phase of the discharge, before significant expansion, remains low in accordance with the aim pursued by the invention;
- the discharge extends and then quickly stabilizes between the two ends x c of the expansion zones of each electrode element 4, 4 ′ so that, during this second phase of the discharge, the intensity of the electric current is high and the share of electrical energy of the discharge which is dissipated in this second phase of the discharge and in particular the stabilization phase, is significant in accordance with the aim pursued by the invention.
- Entries in this model include:
- composition of the landfill gas typically Xe: 5% - Ne: 95%;
- the dimensions of the cell typically, width W c between 0.10000E-01 cm and 0.30000E-01 cm, length L c between 0.20000E-01 cm and 0.60000E-01 cm;
- the software therefore presents a grid of 48 steps x 48 steps on which one enters, according to a cross section of the cell to study the influence of the electrode width, at all points the shape of the dielectric layer covering the electrodes and its local dielectric constant. Then bars of variable width are positioned on this grid representing on the one hand the coplanar electrode element on the front coplanar panel, on the other hand the addressing electrode on the other rear panel. For the modeling tests, a coplanar electrode of variable width was chosen centered on the axis Ox.
- the potential of each of the electrodes is entered. Obviously, by fixing 1 volt on the front face and 0 volts on the addressing electrode of the rear face, one can directly obtain a normalized potential distribution between 0 and 1 on the surface of the dielectric layer in the cell. When we run the software model, we do not perform any discharge, because we are trying to obtain the distribution of the potential of the dielectric layer. The various tests also show that, before or after a discharge, the model gives exactly the same potential distribution on the surface of the dielectric layer, since the distribution of memory charges perfectly follows the potential lines. By applying 0 and 1 V we will obviously never make a discharge, but we will obtain the desired surface potential distribution.
- the distribution according to the invention of the potential on the surface of the dielectric layer can be obtained by modifying the thickness or the relative permittivity of the dielectric layer covering the electrode elements. of constant width.
- the relationship between the value of the surface potential V (x) at position x and the value of the potential applied to the electrode V can be approximated by the relation:
- V (x) / V 1- [E 1 (x) / P 1 (x) ] / [E ⁇ ( ⁇ ) / P ⁇ (X ) + H (X ) + E 2 (x) / P 2 ( x) ]
- E1 (x) the thickness expressed in microns and P1 (x) the relative permittivity of the dielectric layer above each electrode element 4, 4 ′ at position x along the Ox axis of expansion of the dump ;
- E2 (x) the thickness expressed in microns and P2 (x) the relative permittivity of the dielectric layer above the addressing electrode X or of the slab 2 in the absence of an addressing electrode, at the position x along the Ox axis of expansion of the discharge.
- the ratio 1 - [E ⁇ (X ) / P ⁇ ( ⁇ )] / [E ⁇ ( ⁇ ) / P ⁇ (X ) + H ( ⁇ ) + E 2 (x) / P 2 (x) ] is, for 0 ⁇ x ⁇ x bc , increasing continuously or discontinuously as a function of x; the evolution of this ratio over this interval does not include any negative growth points; in the event of discontinuous growth by jump, the evolution of this ratio preferably comprises at least two stages in this interval; in the case of continuous growth, this ratio preferably increases linearly as a function of x (according to a law of type ax + b).
- the electrode element is of constant width W e (x) and of length adapted so that the total length of the discharge zone at the end of discharge L max , which is spread between the opposite ends of the elements electrode on either side of the inter-electrode space 5, either less than or equal to L c -200 ⁇ m,
- FIG. 8 describes a first example of the invention according to this first general embodiment. It is difficult to continuously vary the electrostatic properties of the dielectric layer 6 of the slab 1 or that 7 of the slab 2.
- FIG. 8 describes the longitudinal section of a cell according to the invention, the distribution of the surface potential at the center of the cell along the axis Ox, given on curve C in FIG. 7, approximates the ideal theoretical curve.
- This cell provided with two identical electrode elements 4E, 4E ', has the following characteristics:
- each electrode element 4E, 4E ′ has a constant width, as in FIG. 1A of the prior art, and a length such that the distance L max separating their respective opposite end is less than L c -200 ⁇ m,
- each electrode element has, for Xt ⁇ x ⁇ cd , a thickness greater than 5 times the thickness of the electrode element in the rest of the discharge zone; this over-thickness zone generally corresponds to the supply bus of the electrode elements;
- a first homogeneous dielectric layer 6E of relative permittivity P1 covers the whole of the discharge zone: thus, compared to the expansion zone Z b , the thickness of this layer 6E is less in the stabilization zone where the electrode element is thicker; preferably, the thickness of the dielectric layer is suitable for that the dielectric thickness in the stabilization zone is less than half the dielectric thickness in the expansion zone Z b ;
- a second dielectric layer 6E ′ with relative permittivity P1 ′ identical to or less than that of the first layer 6E partially covers the discharge zone outside the excess thickness of the conductive element for 0 ⁇ x ⁇ x ab , so that the total thickness of the dielectric layers 6E, 6E at the ignition zone Z a and outside the expansion zone Z b is between 1, 5 and 2 times the thickness of the dielectric layer 6E.
- a second general embodiment of the invention consists in varying the width W e (x) of the electrode element in the discharge expansion zone Z b , so as to increase the surface potential of the dielectric layer according to the basic law specific to the invention defined above; to keep it simple, a dielectric layer of uniform thickness and composition is kept in the expansion zone.
- FIG. 9 graphically presents the general law connecting the width of the electrode element W e . ua (logarithmic scale in arbitrary unit “ua”) and the standard potential V norm which is obtained on the surface of the dielectric layer covering this electrode element before a discharge, where V norm has been previously defined.
- the parameter "a” of relation (1) depends mainly on the specific surface capacity of the dielectric layer 6 of the slab 1.0n calls E1 (x) the thickness expressed in microns and P1 (x) the relative permittivity of the layer dielectric above the electrode element considered 4. It has been found experimentally that the parameter “a” varied in square root of the ratio
- W e _ ab at the entrance to the expansion zone depends directly on the choice of v na b -
- E1 x [(PI / El) - 0.85] the sign means "square root").
- V n _ ab between 0.9 and 0.98 we can easily find the value of W e . corresponding ab using the following formula:
- V (x) (x- ab) ⁇ (V n -bc- v n-ab) / ( ⁇ bc- ab) + V n . a b-
- This relation (2) defines the preferential ideal profile of the invention W e _ id . 0 , which leads to a linear distribution of the surface potential in the expansion zone.
- any profile of the electrode element which is between this profile of lower limit W e . id . inf and this upper limit profile W e . id _ s ⁇ ) p allowed to lead to a continuous or discontinuous increasing distribution of the potential between the beginning and the end of the expansion zone Z a , according to the essential general characteristic of the invention.
- the conventional embodiments of dielectric layers limit the ratio P1 / E1 so that, generally, we have: 0.2 ⁇ P1 / E1 ⁇ 0.8 and so that it is preferable, to limit the amount of energy dissipated at the start of discharges, choose a width W e _ ab of conductive element less than or equal to 50 ⁇ m at the start x zone ab expansion Z b and a width W e _ bc , at the end x bc of the expansion zone, strictly greater than this value.
- a width W e is generally chosen.
- conductive element ab slightly greater than this value.
- the production of the electrode conductive elements calls upon manufacturing technologies which obviously have limits in precision.
- the precision of production of the electrodes does not call into question the application of the invention, in so far as the width of electrode W ⁇ in the expansion zone Z b along the axis Ox does not vary more or minus 15% compared to the values defined in the invention.
- the specific longitudinal capacity of the dielectric layer in the zone Z c should be greater the specific longitudinal capacity of the dielectric layer at any other point in the discharge zone. If W s is the width of the electrode element in the stabilization zone, preferably, we choose W s as high as possible, therefore relatively close to W c (cell width) and we choose W e . bc less than or equal to W s .
- FIGS. 10A, 10B, 10C, 10D represent examples of shapes of electrode elements in accordance with this second general embodiment of the invention, according to a top view (Oz axis of FIG. 6) of a half - plasma display screen cell:
- a solid element whose contours, under the expansion area Z b meet the specific conditions of this second embodiment of the invention; preferably, the area of the electrode element which is hatched in the figure is made of transparent conductive material; on the contrary, the area 101 of the electrode element which is blackened in the figure, which corresponds to the conductive bus Y c , Y ′ c of the electrode Y, Y ′, is made of conductive material, generally opaque and of thickness greater than that of the hatched area, so that the thickness of the dielectric layer 6 is less in the hatched area; the conductive bus Y c is preferably positioned outside the discharge zone so as not to obscure the visible light emitted by the phosphor layer covering the internal walls of the discharge cell.
- the cell walls play an important role in the behavior and the efficiency of production of ultraviolet radiation from the discharge, in particular at the regions of the electrode element which are located in the vicinity of these walls, in the zones where this element has a width W e close to the width W c of the cell.
- this zone of influence of the walls typically extends up to a distance from the walls of between 30 and 50 ⁇ m, depending, in particular, on the composition and the pressure. landfill gas.
- the electrode elements are connected, behind the ignition and expansion zones, to the bus Y b of the coplanar electrodes Y, Y '.
- the bus is integrated into the stabilization zone, in which case one encounters the disadvantages of the aforementioned wall effect resulting from too wide a width of the stabilization zone; this case is illustrated in FIG. 2C described below;
- the bus is moved back behind the stabilization zone, in which case there is the problem of the connection of the electrode elements to the bus; the bus is then preferably positioned at the level of a wall of the cell and elements for connection of the electrode elements to the bus are then used which have a width much less than that of the stabilization zone; this case is illustrated in FIGS. 10B and 10D described below.
- FIG. 10B is similar to that of FIG. 10A already described, but, in the discharge stabilization zone, the electrode element here has a width less than the width W c of the cell, and is separated from the conductive bus 101 by an insulating thickness 151 of the horizontal wall 15 of the cell, except in a zone 102 of electrical contact, so as not to allow the discharge to penetrate the zone of influence of low-efficiency wall luminous ; the width of the electrical contact zone 102 is generally between 50 ⁇ m and 150 ⁇ m so as not to increase the contact resistance between the conductive bus Y c and the discharge stabilization zone Z c .
- the luminous efficiency and the lifetime of the phosphors are therefore further improved by using the structure of FIG. 10B.
- the total capacity of the dielectric layer in said zone is also partially reduced, so that the luminance of the discharge can be reduced.
- FIG. 10C takes up the general structure of FIG. 10B, the conductive bus this time being integrated into the discharge stabilization zone Zc and distant from the wall influence zone, so that the smallest thickness of the dielectric layer covering the conductive bus increases the specific surface capacity along the conductive bus and here increases the capacity of the discharge stabilization zone. This increases the time and the luminance of the discharge.
- FIG. 10D is a variant of the example of FIG. 10C, making it possible to reduce the opacity of the conductive bus in the area of emission of visible light of the phosphor.
- FIGS. 11A to 11 D illustrate other examples of the second general embodiment of the invention.
- the alignment process for assembling the slab 1 with the slab 2 does not always make it possible to align non-parallel or perpendicular patterns between them. It may therefore be preferable not to use an electrode whose contours would be curved as previously described.
- the object pursued by the invention can be achieved by generating a discontinuous increase by jumps in potential at the surface of the dielectric layer, by using successive portions of conductive element of increasing width.
- FIG. 11A illustrates an example identical to that of FIG. 10C with the difference that, under the expansion zone, the electrode element is formed by a central conductor of narrow width W r electrically connecting a succession of segments conductors of constant width W el , W e2 , W e3 extending transversely to the central conductor in order of increasing width according to average positions of these segments marked x1, x2, x3 on the axis Ox; according to the invention, it is verified that the width values W el , W e2 , W e3 , referred to the positions x1, x2, x3 on the axis Ox are well between the lower limit profile W e . id . inf and the upper limit profile W e .
- the process for manufacturing the conductive elements may not allow sufficiently fine segments to be produced, in particular in the part of the expansion zone closest to the discharge start-up zone. It is then possible to use the same single segment of weak width W el over a first part of the expansion zone Z b located between x ab and a value x bl , as long as the length x ⁇ ⁇ x ab of the part of the expansion zone corresponding to this first segment is less to half the length of the expansion zone x bc -x ab .
- FIG. 11B illustrates an example identical to that of FIG. 11A with the difference that the segments here extend in the same direction as the axis Ox; as in FIG. 11 A, their ends define in dotted lines a contour conforming to within 15% of the ideal linear contour of the electrode element
- FIG. 11C illustrates an example identical to that of FIG. 10C with the difference that, under the expansion zone, the electrode element comprises a first rectilinear zone of width equal to W e . ab or the minimum width allowed by the manufacturing process and preferably less than 50 ⁇ m, and a second trapezoidal zone whose smallest base is equal to the width of the rectilinear zone.
- the dimensions of the first and of the second zone are chosen so that the outline of the electrode element generally fits between the lower limit profile W e . id . inf and the upper limit profile W e _ id . sup previously described, which deviate by - 15% and + 15% respectively from the ideal linear profile W e .
- id _ 0 previously defined for the second general embodiment of the invention.
- the electrode element according to this variant makes it possible to obtain an effect substantially identical to that of an ideal contour, however advantageously eliminating certain manufacturing constraints.
- a first rectilinear zone of length less than or equal to 100 ⁇ m will be used.
- Figure 11 D illustrates a variant of Figure 11 A where the distance between the electrode segments is zero.
- the contour of the electrode element is then in the form of a staircase along the axis Ox of spreading of the discharge in the expansion zone Z b .
- the main conditions for arriving at the definition of optimal geometries are as follows: minimize the ignition voltage V a , limit the electric current l a during the ignition phase, and obtain on the surface of the dielectric of the ignition zone a potential which is equal to and not greater than the potential at the start of the expansion phase; it can be seen on curves B1 and C in FIG. 5 that this latter condition is not fulfilled, since there is a zone of interval of values of x close to the ignition edge where this potential has a maximum.
- the well-known Paschen laws make it possible to define the electric voltage V a to be applied between the electrodes of the same maintenance pair to trigger an electronic avalanche in the discharge gas filling the discharge zones between the tiles of a plasma panel, and thereby generating a plasma discharge; these laws establish the relations of this voltage with, in particular, the nature and the pressure of the discharge gas, the distance or "gap" separating the discharge edges of the two electrodes.
- an electrode element whose ignition edge would be very narrow as described above in the examples of the second general embodiment of the invention, for example an electrode element provided only with a zone of expansion and whose width, at the ignition edge, would be of the order of W e.ab , would modify the uniformity of the electric field and the avalanche gain of the discharge, with as a consequence an increase in the voltages of operation and increased delay discharge for a given voltage, with consequences on the cost of power electronics and the addressing speed of the plasma display screen.
- FIG. 13 shows schematically the ignition zones of two electrode elements of the same discharge cell; the width of the ignition front is W a , the "length" of the ignition zone, measured along the axis Ox defined above, is equal to L a and corresponds to the level where the expansion zone begins (not shown) and where the width of the expansion zone is minimum W e . ab .
- FIG. 12 shows the evolution of the normalized ignition voltage V a (solid line curve) as a function of the width W a of the ignition front.
- the avalanche gain depends on the number of primary charges present in the area where ignition is possible according to Pashen conditions; the larger this area, the greater the number of primary charges; a large ignition zone therefore increases the avalanche gain and reduces the ignition potential (fine dotted curve).
- width W a of the ignition zone there is a minimum width W a _ min above which the ignition voltage V a is not or only slightly modified by the width W a of the ignition front. This value of W a . min corresponds to the critical width beyond which the walls cause significant losses on primary particles created in the space between W a . min and W c .
- the ignition element of the electrode element must be relatively high to maintain a low ignition voltage, it is therefore preferable that the ignition surface is small enough not to generate an ignition current l a too high. Any increase in the width of the ignition zone beyond W a _ min provides little additional primary particles and little or no electrostatic increase in the surface potential.
- the wall influence zone between W a . min and W c , extends to at most 50 ⁇ m from each side wall.
- an ignition front width W a greater than or equal to W c - 100 microns to obtain the lowest ignition potential; preferably, in the case of cells with a width greater than 400 ⁇ m, W a does not exceed 300 ⁇ m.
- the width of the ignition zone will be close to W c - 100 microns so as to limit the surface and therefore the capacity of the dielectric layer in the ignition zone. To maintain a low capacity in the ignition zone, this implies, as explained below, that the other dimension L a of the ignition zone is relatively small.
- the length L a of the ignition front only changes the value of the surface potential of the dielectric layer along the ignition zone.
- the variation of the surface potential along this length L a is similar to the variation given for the electrode width W e in the expansion zone.
- the length L a will preferably be chosen. of the electrode element equal to W e . ab .
- the ignition voltage V a it is possible to increase the length L a of the electrode element in the ignition zone beyond W e . ab .
- W a > W a . min by preferably adopting the following provisions.
- W a . min corresponded to the width beyond which the walls cause a significant reduction in the surface potential of the dielectric layer and significant losses of primary particles created in the space located between W a . min and W c . Z in the ignition zone, it is then possible to distinguish a central zone Z. c for which, at any point, y ⁇ W a . min / 2 and two lateral zones Z a . pl , Z a _ p2 on either side of the central zone for which, at any point, y> W a . min / 2.
- lateral zones Z a In the lateral zones Z a .
- FIGS. 13, 14 can be combined with any other expansion zone Z b and stabilization zone Z c described in the examples in FIGS. 10 and 11, as shown in FIGS. 15A and 15B taking up the general structure of FIG. 10C supplemented with ignition zones of the respective figures 13 and 14.
- FIGS. 15A and 15B taking up the general structure of FIG. 10C supplemented with ignition zones of the respective figures 13 and 14.
- the capacity formed by these walls between the two panels of the panel weakly but gradually decreases the surface potential on the dielectric layer along the axis Oy, so that the discharge remains centered on the central axis Ox of the cell, on the surface of the dielectric layer covering the coplanar electrode elements of the slab 1, and so that the discharge, that is to say the source of ultraviolet photons, is at a maximum distance from each wall covered with phosphor (barriers 15, 16 generally supported by panel 2).
- the expansion zone is preferably subdivided into two expansion paths rather than one, as in the U-shaped electrodes previously described with reference to documents EP0782167 and EP0802556; the expansion zone of the electrode element according to the invention is then subdivided into two lateral zones Z b . pl , Z b .
- FIG. 16 represents an electrode element according to this preferred embodiment of the invention, where the two lateral conductive elements give rise to two expansion zones Z. pl and Z b . p2 arranged symmetrically with respect to the longitudinal axis Ox of symmetry of the cell.
- the greater part of each lateral zone of expansion of the lateral conductive element is distant by more than 30 ⁇ m from the lateral wall of the cell, in order to avoid the harmful wall influences described above.
- FIGS. 18A, 18B, 18C, 18D take up the general diagram of electrode element presented in FIG. 10C, with the difference that the electrode element is here subdivided into two lateral conductive elements symmetrical with respect to the central axis Ox of the cell, both at the level of the expansion zone Z b and of the ignition zone Z a ; the total width W e of the lateral conductive elements checks, in the expansion zone Z b , the general law defined above with reference to the second general embodiment of the invention; thus, the discharge is spread in two parallel general directions both at the ignition zone Z a and at the expansion zone Z b .
- each ignition zone of a conductive element has an electrode width W al and W ⁇ less than W e . ab .
- FIG. 18B illustrates this preferred embodiment: this example is similar to that of FIG. 18A, with the difference that the distance between the edges of the two lateral conductive elements is between 100 and 200 ⁇ m.
- the ignition properties of the discharge are significantly improved.
- the electrostatic influence of one lateral conductive element on the other increases and disturbs the evolution of the surface potential on the dielectric layer above each lateral conductive element, to the point that one departs from the general objective of increasing potential pursued by the invention even if the total width W e of the conductive elements satisfies, in the expansion zone Z b , the general law defined above with reference to the second general embodiment of the invention.
- plj Z a . p2 it is advantageous not to spread the lateral ignition zones Z a too far . plj Z a . p2 but to separate the lateral expansion zones Z b sufficiently. plj Z b . p2 of each axi-symmetrical lateral conductive element.
- the best compromise consists in using, according to a variant of the invention, electrode elements subdivided, in the ignition zone and most of the expansion zone, into two axially-symmetrical lateral conductive elements, where :
- the distance between the edges turned towards each other of these zones remains fairly small and between 100 and 200 ⁇ m to limit the lowering of the surface potential at the center of the cell, evaluated transversely to the axis Ox , - at the level of the lateral expansion zones Z b . pl , Z b . p2 , the distance between the edges turned towards each other of these zones is greater in order to obtain a distribution of the surface potential in accordance with the invention evaluated transversely to the axis Ox, and to limit the mutual electrostatic influence of these lateral expansion zones.
- d e _ p (x) the distance, measured parallel to the axis Oy at any position x between x ab and x bc , between the edges facing one another of a portion of the first area lateral expansion Z b . pl positioned at x and a portion of the second lateral expansion zone Z b . p2 also positioned at x.
- lateral conductive elements will be used for which:
- x x b between x ab and x bc such that, for any value of x between x ab and x 2 , d e . p (x)> d a . p .
- FIG. 18C illustrates an example of an electrode element subdivided into two lateral conductive elements which have these characteristics.
- Each lateral conductive element is curved at start-up towards the walls, so that the distance between the two lateral conductive elements is small at start-up, in a range between 100 and 200 microns, and then increases regularly with x until each lateral conductive element has approached a wall of the cell to the point that the disadvantageous wall effect begins to manifest itself; to avoid this wall effect, the distance which separates from a wall the closest lateral edge of each lateral conductive element remains at any point of the expansion zone greater than or equal to 30 ⁇ m.
- the tangent in x to the mean line of this element make with the axis Ox an angle less than 60 °, preferably between 30 ° and 45 °.
- FIGS. 18D and 18E there are examples identical to those, respectively, in FIGS. 18B and 18C, with the difference that, under the expansion zone, the electrode element is discontinuous and distributed in a succession of conductive segments as previously described with reference to Figure 11B; as before, the contour defined by the ends of each segment is such that, in the expansion zone, the cumulative width of the electrode element is generally registered between the lower limit profile W e . id _ inf and the upper limit profile W e . id _ sup previously described, which deviate from -15% and + 15% respectively from the ideal linear profile W e . id . 0 previously defined for the second general embodiment of the invention.
- the mutual electrostatic influence of two axial conductive elements is used. -symétriques.
- This third general embodiment of the invention therefore relates to electrode elements each subdivided, at least at the level of the expansion zone, into two axiosymmetric lateral conductive elements which this time have a constant width but a mutual spacing of e .
- p (x) which decreases continuously or discontinuously as a function of x for all x lying between x ab and x bc so as to obtain, in accordance with the invention, continuous or discontinuous growth in the surface potential of the layer dielectric along the Ox axis; a dielectric layer of uniform thickness and composition is then kept in the expansion zone.
- FIG. 19 gives an example of a structure in accordance with this third embodiment in which the variation in potential at the surface of the dielectric layer covering the electrode portions of the expansion zone varies as a function of the average spacing of the two conductive elements side.
- the electrostatic influence of one electrode portion on the other is strong enough here to allow a variation of the standard surface potential of between 0.9 and 1 while retaining a width of lateral conductive element W e _ pl ( x) and W e . p2 (x) constants for x varying between x ab and x bc .
- the ignition zone Z a advantageously comprises an elongated central zone having a length L a + ⁇ L a greater than on its two lateral parts, which are each connected to an expansion zone Z b . pl , Z b .
- pl and Z b . p2 therefore functions as a discharge initiator which does not cause any additional energy dissipation for the expansion; for this purpose, it is preferable that the elongation ⁇ L a is chosen so that ⁇ L a + L a ⁇ 80 ⁇ m, and that the width W ⁇ of the lug 201, measured along the axis Oy, is such that W e . ab ⁇ W a . j ⁇ 80 ⁇ m.
- each conductive element of the coplanar electrodes comprises, in addition to a transverse bar in the ignition zone and a transverse bar in the stabilization zone connected by axially symmetrical lateral conductive elements of width constant as in the prior art, at least one additional transverse bar positioned at the level of the expansion zone; in addition, the dimensions and the positions of the transverse bars fulfill other conditions explained below.
- FIG. 20A describes a structure of the type with elements of coplanar electrodes fairly close to that of FIG. 4A, already described with reference to Figure 9 of document EP0802556 - MATSUSHITA.
- Each conductive element Y is divided into three zones, an ignition zone Z a , an expansion zone Z b and a stabilization or end of discharge zone Z c .
- the ignition zone Z a here corresponds to the transverse bar 31.
- the stabilization zone Z c here corresponds to a transverse bar 33 ′ which extends here, unlike FIG.
- transverse bars 31, 33 ′ are connected, at the level of the expansion zone Z b , by axiosymmetrical lateral conductive elements or lateral legs 42a, 42b, which are very distant from each other since they are offset at the levels of the walls of the cell, and which each have a width W e . pl and W e . p2 constants.
- FIG. 21 describes the distribution of the surface potential of the dielectric layer according to sections A - curve A - and B - curve B - of the cell in FIG. 20A. This distribution is obtained using the SIPDP-2D software previously mentioned.
- the capacity of the dielectric layer located at the end of discharge area is greater than the specific capacity of the dielectric layer located at the ignition area of the discharge, so as to establish a positive potential difference "between the ignition zone and the end of discharge zone.
- the length L e of a conductive element modifies the potential at the surface of the dielectric layer according to the same laws.
- the length Le played no role since Le is always greater than W e , so that the variation in potential at the surface of the dielectric layer is only influenced by the width of the conductive element.
- the dielectric surface potential on curve A decreases appreciably at the outlet of the ignition zone, due to the absence of an electrode in the expansion zone between the two side walls. In this part of the expansion zone, the surface potential depends on the potential created by the two perpendicular bars located at the side walls.
- At least one third crossbar 205 is added, according to the fourth general embodiment of the invention.
- the length L b of this bar measured along the longitudinal axis of symmetry Ox of the cell , is such that L b ⁇ L a ⁇ L s .
- this bar is positioned this time at the level of the expansion zone in the following manner: if d1 is the distance between the edges which merges opposite the ignition zone Z a and the zone d ' Z b expansion, if d2 is the distance between the edges which face the bottom of the stabilizing zone Z c and Z expansion region b, one ad 2/2 ⁇ d ⁇ ⁇ d 2.
- each electrode element comprises at least three transverse bars 31, 205, 33 ′ which extend in a general direction perpendicular to the direction Ox of expansion of the discharges, which are connected to each other by axial side conductive elements. symmetric perpendicular to the cross bars and positioned at the side walls of the slab 2.
- the invention finds its application particularly in the case where these electrodes Y, Y ′ of the co-planar slab of the plasma panel are supplied by voltage pulses having constant voltage steps (pulses in the form of a square wave) at conventional frequencies generally between 50 and 500 kHz.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/518,567 US7586465B2 (en) | 2002-06-24 | 2003-06-19 | Coplanar discharge faceplates for plasma display panel providing adapted surface potential distribution |
KR1020047020969A KR100985491B1 (ko) | 2002-06-24 | 2003-06-19 | 적응된 표면 전위 분배를 제공하는 플라즈마 디스플레이 패널용 공동 평면 방전 면판 |
JP2004514877A JP4637576B2 (ja) | 2002-06-24 | 2003-06-19 | 適合化表面電位分布を提供するプラズマディスプレイパネル用のコプラナー放電電極板 |
AU2003255512A AU2003255512A1 (en) | 2002-06-24 | 2003-06-19 | Coplanar discharge faceplates for plasma display panel providing adapted surface potential distribution |
EP03760707A EP1516348B1 (fr) | 2002-06-24 | 2003-06-19 | Dalle de decharges coplanaires pour panneau de visualisation a plasma apportant une distribution de potentiel de surface adaptee. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0208094 | 2002-06-24 | ||
FR0208094A FR2841378A1 (fr) | 2002-06-24 | 2002-06-24 | Dalle de decharges coplanaires pour panneau de visualisation a plasma apportant une distribution de potentiel de surface adaptee |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004001786A2 true WO2004001786A2 (fr) | 2003-12-31 |
WO2004001786A3 WO2004001786A3 (fr) | 2004-02-19 |
Family
ID=29720055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/050243 WO2004001786A2 (fr) | 2002-06-24 | 2003-06-19 | Dalle de decharges coplanaires pour panneau de visualisation a plasma apportant une distribution de potentiel de surface adaptee. |
Country Status (8)
Country | Link |
---|---|
US (1) | US7586465B2 (fr) |
EP (1) | EP1516348B1 (fr) |
JP (1) | JP4637576B2 (fr) |
KR (1) | KR100985491B1 (fr) |
CN (1) | CN100377281C (fr) |
AU (1) | AU2003255512A1 (fr) |
FR (1) | FR2841378A1 (fr) |
WO (1) | WO2004001786A2 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1406287A1 (fr) * | 2002-04-18 | 2004-04-07 | Matsushita Electric Industrial Co., Ltd. | Ecran a plasma |
US7781972B2 (en) | 2005-05-11 | 2010-08-24 | Lg Electronics Inc. | Plasma display panel |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2855646A1 (fr) * | 2003-05-26 | 2004-12-03 | Thomson Plasma | Panneau de visualisation a plasma a zone d'expansion de decharge de section reduite |
KR100649210B1 (ko) * | 2004-10-20 | 2006-11-24 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널 |
DE602005009107D1 (de) * | 2004-11-17 | 2008-10-02 | Samsung Sdi Co Ltd | Plasma Anzeigetafel |
KR100578936B1 (ko) | 2004-11-30 | 2006-05-11 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널 및 그 구동방법 |
KR100673437B1 (ko) * | 2004-12-31 | 2007-01-24 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널 |
KR100627318B1 (ko) * | 2005-03-16 | 2006-09-25 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널 |
KR100730171B1 (ko) * | 2005-11-23 | 2007-06-19 | 삼성에스디아이 주식회사 | 디스플레이 장치 및 그 제조방법 |
KR100730213B1 (ko) * | 2006-03-28 | 2007-06-19 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널 |
JP4745920B2 (ja) * | 2006-08-28 | 2011-08-10 | 三菱重工業株式会社 | 放電電極、薄膜製造装置、及び太陽電池の製造方法 |
WO2008136051A1 (fr) * | 2007-04-24 | 2008-11-13 | Hitachi, Ltd. | Ecran d'affichage à plasma |
KR100863970B1 (ko) * | 2007-05-31 | 2008-10-16 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널 |
US8458007B2 (en) * | 2010-12-17 | 2013-06-04 | Verizon Patent And Licensing Inc. | Work order estimator |
JP6185935B2 (ja) * | 2012-01-27 | 2017-08-23 | ユニバーシティ オブ テネシー リサーチ ファウンデーション | 交流動電によるバイオマーカーの検出のための方法および装置 |
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EP0782167A2 (fr) | 1995-12-28 | 1997-07-02 | Pioneer Electronic Corporation | Appareil d'affichage à plasma en courant alternatif à décharge de surface et méthode de commande d'un tel appareil |
EP0802556A2 (fr) | 1996-04-17 | 1997-10-22 | Matsushita Electronics Corporation | Panneau d'affichage à plasma encourant alternatif |
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EP1032015A2 (fr) | 1999-02-24 | 2000-08-30 | Fujitsu Limited | Panneau d'affichage à plasma à décharge de surface |
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JP3345399B2 (ja) * | 1995-12-28 | 2002-11-18 | 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 |
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JP2003142001A (ja) * | 2001-10-31 | 2003-05-16 | Matsushita Electric Ind Co Ltd | プラズマディスプレイパネル |
-
2002
- 2002-06-24 FR FR0208094A patent/FR2841378A1/fr active Pending
-
2003
- 2003-06-19 AU AU2003255512A patent/AU2003255512A1/en not_active Abandoned
- 2003-06-19 EP EP03760707A patent/EP1516348B1/fr not_active Expired - Fee Related
- 2003-06-19 KR KR1020047020969A patent/KR100985491B1/ko not_active IP Right Cessation
- 2003-06-19 JP JP2004514877A patent/JP4637576B2/ja not_active Expired - Fee Related
- 2003-06-19 US US10/518,567 patent/US7586465B2/en not_active Expired - Fee Related
- 2003-06-19 WO PCT/EP2003/050243 patent/WO2004001786A2/fr active Application Filing
- 2003-06-19 CN CNB038149087A patent/CN100377281C/zh not_active Expired - Fee Related
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EP0782167A2 (fr) | 1995-12-28 | 1997-07-02 | Pioneer Electronic Corporation | Appareil d'affichage à plasma en courant alternatif à décharge de surface et méthode de commande d'un tel appareil |
EP0802556A2 (fr) | 1996-04-17 | 1997-10-22 | Matsushita Electronics Corporation | Panneau d'affichage à plasma encourant alternatif |
EP0933017A1 (fr) | 1998-01-29 | 1999-08-04 | Deere & Company | Transporteur rotatif avec corps de rotation et au moins un entraíneur et récolteuse pourvue d'un tel transporteur rotatif |
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EP1406287A1 (fr) * | 2002-04-18 | 2004-04-07 | Matsushita Electric Industrial Co., Ltd. | Ecran a plasma |
EP1406287A4 (fr) * | 2002-04-18 | 2008-09-10 | Matsushita Electric Ind Co Ltd | Ecran a plasma |
US7781972B2 (en) | 2005-05-11 | 2010-08-24 | Lg Electronics Inc. | Plasma display panel |
Also Published As
Publication number | Publication date |
---|---|
FR2841378A1 (fr) | 2003-12-26 |
AU2003255512A8 (en) | 2004-01-06 |
EP1516348A2 (fr) | 2005-03-23 |
WO2004001786A3 (fr) | 2004-02-19 |
US7586465B2 (en) | 2009-09-08 |
EP1516348B1 (fr) | 2012-09-12 |
AU2003255512A1 (en) | 2004-01-06 |
JP4637576B2 (ja) | 2011-02-23 |
CN1663008A (zh) | 2005-08-31 |
JP2005531110A (ja) | 2005-10-13 |
US20060043891A1 (en) | 2006-03-02 |
KR20050008850A (ko) | 2005-01-21 |
CN100377281C (zh) | 2008-03-26 |
KR100985491B1 (ko) | 2010-10-08 |
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