WO2003073406A1 - Moyens d'alimentation et de pilotage pour panneau a plasma utilisant des transformateurs. - Google Patents
Moyens d'alimentation et de pilotage pour panneau a plasma utilisant des transformateurs. Download PDFInfo
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- WO2003073406A1 WO2003073406A1 PCT/FR2003/000496 FR0300496W WO03073406A1 WO 2003073406 A1 WO2003073406 A1 WO 2003073406A1 FR 0300496 W FR0300496 W FR 0300496W WO 03073406 A1 WO03073406 A1 WO 03073406A1
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- electrodes
- panel
- holding
- transformer
- primary
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Classifications
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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
- G09G3/2965—Driving circuits for producing the waveforms applied to the driving electrodes using inductors for energy recovery
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Definitions
- the invention relates to supply and control means for controlling a plasma display panel.
- An alternative plasma display panel with memory effect generally comprises two parallel panels providing between them a space containing a discharge gas; between the slabs, generally on the internal faces of these slabs, such a panel comprises several networks of electrodes:
- the two holding networks are formed by electrodes arranged on the same slab in parallel general directions; each electrode of a holding network forms with an electrode of the other holding network a pair of electrodes delimiting between them a succession of zones of light discharges, generally distributed along a line of picture elements of the sign.
- the two support networks are no longer coplanar and are located on different slabs.
- the light discharge zones form, on the panel, a two-dimensional matrix; each zone is likely to emit light so that the matrix displays the image to be viewed.
- At least one of these electrode networks is used both for addressing and for holding.
- the adjacent discharge zones at least those which emit different colors, are generally delimited by barriers; these barriers generally serve as spacers between the slabs.
- 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 scan or sub-scan generally comprises the following steps: - first, a selective addressing step Q which aims to deposit electrical charges on the portion of dielectric layer of the discharge zones to be activated, by application of at least one voltage pulse between the addressing electrodes crossing in these zones, - then, a non-selective holding step Qs during which a succession of voltage pulses is applied between the electrodes of the holding pairs so as to cause a succession of light discharges only in the discharge zones which have been addressed beforehand.
- Certain sweeps or sub-sweeps of the panel may also include other phases, such as erasing or priming phases, which involve the application of specific voltage pulses; these pulses generally have specific characteristics, not only at the level of the bearing voltage (high or low), but also at the level of the ramps of rise and / or descent of the voltage.
- the subject of the invention is supply and control means for an alternative plasma panel with memory effect which comprises:
- a dielectric layer covering at least one of said holding networks to provide the memory effect characterized in that these means include:
- At least one transformer each comprising a primary circuit and a plurality of secondary circuits magnetically coupled to said primary circuit and each provided with a high terminal and a low terminal intended to be connected, without an intermediate switch, respectively to one and to the other electrodes of a pair of said panel,
- a pulse generator for maintaining primary voltage across the terminals of the primary circuit (s) of the at least one transformer, which is adapted so that:
- each secondary circuit magnetically coupled with the primary circuit (s) can deliver a succession of high and low terminals of pulses having alternately high and low stages capable of causing, during these stages, light discharges only in the discharge zones situated between the electrodes connected to these terminals which have been previously activated, - the inductances of the primary circuit or circuits and secondary circuits of the transformer or transformers cooperate so as to recover and re-inject the capacitive energy between said electrodes.
- the prior activation of the discharge zones is carried out in a manner known per se, in particular by means of selective addressing means; the memory effect allows each previously activated discharge zone to remain activated after each discharge; advantageously and conventionally, the discharges take place during the stages of the holding pulses so as to obtain a reproducible and usable memory effect; during these stages, the holding voltage is approximately constant.
- the transformation ratio of the transformer (s) is adapted so that the voltage pulses applied to the primary circuit (s) cause amplitude maintaining voltage pulses adapted to the terminals of the secondary circuits, i.e. say between the holding electrodes; “adapted amplitude” is understood to mean an amplitude making it possible to obtain discharges only in the discharge zones which are served by these electrodes and which have been previously activated.
- the recovery of capacitive energy and its re-injection are carried out between each alternation of holding pulse; they are carried out thanks to an inductive-capacitive resonant circuit comprising capacitors, such as that of the panel, and inductors; according to the invention, the inductance of each circuit is formed by that of the corresponding transformer; preferably, the panel supply and control means do not include any other specific inductance for recovering and re-injecting capacitive energy than that of the primary circuit (s) and secondary circuits of the transformer (s).
- transformers thus having a double function, the means of supply and control of the panel are particularly economical.
- switches and diodes suitably controlled are used, as specified later in the detailed embodiments of the invention, where these switches will be considered as means of connection of the generator. primary circuits.
- a plasma panel being conventionally provided with networks of holding electrodes, the supply and control means of this panel comprise, according to the invention:
- At least one transformer each comprising a primary circuit and a plurality of secondary circuits intended to supply, without an intermediate switch, the panel holding electrodes,
- a sustain pulse generator and means for connecting this generator to the primary circuit (s) of the transformer (s), which are adapted so that the inductances of the transformer (s) cooperate so as to recover and re-inject the capacitive energy between these holding electrodes, preferably without any other specific inductance in the circuit.
- the panel supply and control means comprise, in order to selectively activate or deactivate beforehand at least any discharge zone of the panel situated between the electrodes of a holding pair, means for write or erase adapted to apply a write or erase voltage pulse to the secondary circuit supplying said pair of electrodes.
- this write voltage pulse is applied to a terminal of this secondary circuit, preferably a “middle” terminal located between the high terminal and the low terminal; thus, the electrodes connected to this secondary circuit are assigned a write or erase signal.
- the plasma panel further comprises at least one network of data electrodes crossing the electrodes of the first and at least second holding networks at the level of said discharge zones in the space between the slabs.
- the writing or erasing means then generally also comprise a set of column drivers adapted to control each of said data electrodes; for the addressing operations of the panel, such as a selective write or erase operation, using the driver of the data electrodes crossing these discharge zones to be activated or deactivated, a voltage pulse is generally applied data on these electrodes in synchronization with the write or erase voltage pulses applied, via the addressing terminals, to holding electrodes which also cross these areas; these holding electrodes are then also used for addressing.
- a voltage pulse is generally applied data on these electrodes in synchronization with the write or erase voltage pulses applied, via the addressing terminals, to holding electrodes which also cross these areas; these holding electrodes are then also used for addressing.
- This provides a means for addressing selective operations for controlling the plasma panel, such as write operations to activate discharge zones before holding phases, or erasure operations to deactivate discharge zones and selectively end maintenance phases.
- the holding pulse generator is connected to the primary circuits and that the writing or erasing means are moreover intended to be connected to the addressing terminals of the secondary circuits, the line drivers are no longer, as in the prior art, crossed by the holding currents; we can therefore use more economical components for these line drivers.
- the panel supply and control means comprise a plurality of H transformers; in addition, the writing or erasing means comprise a set of L line drivers, each driver being intended to apply a writing or erasing voltage pulse to a plurality of H secondary circuits and being, at this point effect, connected by an output to an intermediate terminal called addressing a single secondary circuit for each of the H transformers, each addressing terminal being positioned, on its secondary circuit, between its high terminal and its low terminal, and L corresponding to a number of lines equal to the total number of pairs of electrodes of the panel divided by the number H of transformers.
- each line driver is intended to apply, on command, write voltage pulses to a pair of panel electrodes which serve a "succession" or line of discharge zones.
- each secondary circuit has two extreme output terminals for supplying a pair of electrodes, and an intermediate so-called addressing terminal which has an intermediate potential between that of the low terminal and that of the high terminal and which is connected, according to the invention, at the output of a line driver.
- this addressing terminal corresponds to the midpoint of the secondary circuit so that the potential of this terminal is equidistant from the potential of each supply terminal of the electrodes.
- each transformer supplies a group g of pairs of electrodes or lines of the panel; all the lines of the panel are therefore subdivided into H groups of lines, each group corresponding to a transformer.
- each driver As the output of each driver is, according to the invention, connected to a secondary circuit of each transformer, the same line driver is used for one line of each group of lines, that is to say that it overall controls H lines since 'there are H transformers; compared to the systems of the prior art, it is therefore possible to divide the number of line drivers required by the number H of transformers, which is very advantageous from the economic point of view.
- the supply and control means of the panel further comprise a generator of polarization pulses for writing or erasing and means of connection of this generator to the primary circuits of the transformers, which are adapted so that the inductances of the primary circuits and the secondary circuits of the transformers cooperate in the generation of a reverse bias pulse after each bias pulse, so as to obtain a train of write oscillations or erase formed by successions of a bias pulse for writing or erasing and a reverse bias pulse.
- the polarization of the holding electrodes occurs during the addressing phases of the panel, before the holding phase; according to the invention, the bias pulses are therefore applied to the holding electrodes via the transformer (s) supplying the holding electrodes, which limits their duration; these pulses therefore correspond to the first alternation of oscillations of the transformer or transformers, the second alternation corresponding to a reverse bias pulse; the oscillation regime of the transformer (s) is generally asymmetrical: the first half-wave is short and of high amplitude compared to the second which is long and of low amplitude.
- the writing or erasing means are adapted so that each writing or erasing voltage pulse applied to any secondary circuit is applied while applying a writing or writing bias pulse. deletion to the primary circuit magnetically coupled to said secondary circuit.
- the writing or erasing means are adapted to apply a plurality of writing or erasing voltage pulses to different secondary circuits coupled to the same primary circuit during a bias pulse applied to said primary circuit.
- This arrangement makes it possible to address several lines or pairs of the panel during a polarization pulse; knowing that the number of bias and hold transformers is equal to H, if the number of addressable lines during a bias pulse is equal to N, the total number of bias pulses or oscillations of each primary transformer circuit which will be necessary to address all the lines of the panel will be equal to M, M being such that the product H x M x N is equal to the total number of lines to be addressed; Figure 20, which will be explained later in more detail, illustrates this point.
- This total number M of oscillations applied to each primary transformer circuit fixes the length of the oscillation trains applied to the primary circuits of the transformers by the generator of bias pulses for writing or erasing.
- the panel supply and control means comprise means for triggering a write or erase oscillation train on a primary circuit, and means for triggering each new train of polarization oscillation oscillations. another primary circuit immediately at the end of the first polarization pulse of the preceding oscillation train.
- This arrangement makes it possible to entangle the polarization operations for writing or for selective erasure, and to shorten the addressing of the panel.
- an image display system comprising an alternative plasma panel with memory effect which comprises:
- a dielectric layer covering at least one of said holding networks to provide the memory effect
- the at least one transformer is arranged and fixed on the external face of one of said slabs.
- each transformer is positioned on this outer face at a height corresponding to the average height of the pairs of electrodes which are connected to its secondary circuits.
- Figure 2 is a schematic front view of a panel according to a first embodiment of the invention
- Figure 1 is a partial section of this panel and a magnetic coupling transformer disposed and fixed on the outer face of the rear panel of this panel;
- FIG. 3 is a schematic rear view of the panel of Figures 1 and 2, further representing the means of supply and control of this panel;
- FIG. 4 to 7 relate to the phase of maintaining the control of the panel of Figures 1 to 3 according to a first embodiment of the invention and describe the whole of a maintenance period, namely respectively a first time of inductive energy accumulation, a second inductive energy recovery time, a second inductive energy accumulation time, and a first inductive energy recovery time;
- FIGS. 8 and 9 relate to the addressing phase of the piloting of the panel of FIGS. 1 to 3 according to the first embodiment of the invention, illustrate the regime of oscillation of the polarization of the coplanar electrodes of the panel during this phase, and describe the state of the row and column drivers and of the supply circuits of one of the panel transformers respectively during the first half-wave and during the second half-wave of an oscillation;
- FIG. 10 schematically describes the timing diagrams of electrodes belonging to three different networks Y, Y 'and X of the panel of Figures 1 to 3;
- - Figure 11 describes in more detail than in Figure 10 the voltages applied to the coplanar electrodes of the panel of Figures 1 to 3 during the addressing phase;
- FIGS. 13A to 15A relate to the phase of maintaining the control of the panel of Figure 19 according to a second embodiment of the invention and describe half of a holding period, namely respectively a first accumulation time d inductive energy, a first polarity reversal time, and a second inductive energy recovery time;
- FIGS. 13B to 15B describe the square wave voltage signal and the magnetization intensity during a holding period, the part in solid lines corresponding to the time described in the figure arranged opposite this period;
- FIGS. 16A to 18A relate to the addressing phase of the piloting of the panel of FIG. 19 according to a second embodiment of the invention and describe half of a period of oscillation of the polarization of the coplanar electrodes of the panel during this phase, namely respectively a first time of accumulation of inductive energy, a first time of reversal of the polarities, and a second time of recovery of inductive energy;
- FIGS. 16B to 18B describe the square wave voltage signal and the magnetization intensity during a period of oscillation of the polarization, the part in solid line corresponding to the time described in the figure arranged opposite this period;
- FIG. 20 is another representation of Figure 11 relating to the addressing phase.
- the figures representing chronograms do not take into account a scale of values in order to better reveal certain details which would not appear clearly if the proportions had been respected.
- FIGS. 1 and 2 An alternative coplanar plasma display panel 1 (or “PDP”) with memory effect is shown in FIGS. 1 and 2; it comprises a rear slab 2 and a front slab 3 providing between them a closed space 4 containing a discharge gas.
- PDP coplanar plasma display panel
- the front panel 3 carries two arrays Y, Y ′ of horizontally oriented coplanar electrodes intended to be used in particular in the maintenance phases of the discharges; each electrode of one of the coplanar networks is paired with an electrode of the other network and defines with it a line of discharge zones in the space 4 between the slabs; by way of example, the lines of the panel are here divided into 8 groups of L lines; any number H of groups of lines is obviously conceivable without departing from the invention; as illustrated in FIG.
- the coplanar electrodes are identified by successive pairs P: for the electrodes shown: Y- ⁇ , Y'n, for the first pair Pu of the first group of lines ..., Y 13 , Y '13 for the third pair P 1 3 of the same group, ..., Y 16, Y'i ⁇ to the sixth pair of the same group, and for the following electrode not shown: Y 17, Y '17, ..., up to YI.L, Y'IL for the last pair P 1 of the first group, ..., for the group g of lines, Y g1 , Y ' g ⁇ , ..., Y gi , Y' gi , ..., Y g . ⁇ _, Y ' gL , up to the eighth group of lines, Y 81 , Y' 8 ⁇ , ..., Y 8 .L, Y'S.L.
- the rear panel 2 carries a single network X of P electrodes Xi, ..., Xk, ..., Xp called data extending perpendicular to the coplanar electrodes; this network is not shown in Figure 2; the intersections of the electrodes of this network X with the pairs of coplanar networks Y, Y 'of the other slab form a two-dimensional matrix of discharge zones distributed in space 4 between the slabs; the discharge zones are then distributed in columns along each electrode of the network X; during the phases for addressing the control of the panel, each electrode of this network X k is intended to cooperate with each electrode Y g j of one Y of the coplanar networks, at least when it is a question of activating the discharge zone C - g i located at the intersection of these electrodes Xk, Y g ⁇ ; it can therefore be seen that the electrodes of the network Y are used both for addressing and for maintenance, unlike the electrodes of the network Y 'which are only used for maintenance.
- the networks of coplanar electrodes Y, Y ′ are covered with a dielectric layer and with a thin protective layer generally based on MgO; these layers are not shown; the dielectric layer provides the memory effect; this layer is generally a continuous layer covering the entire front slab; conversely, it can be discontinuous and cover only the electrodes themselves; the rear panel and its array of X electrodes are covered with alternating strips of phosphors intended to emit respectively in red, green and blue under the excitation of the discharges; between these strips and between the electrodes of this network X, there are barriers to separate the columns of discharge zones of different colors and to space the slabs 2, 3; these barriers are not shown.
- this plasma panel 1 at the rear of this plasma panel 1, on one side of this panel open the electrodes Yn-Y ⁇ . ⁇ _ of the first group, then the electrodes of the other groups of the network Y, up to to the electrodes Y S -IY S .L of the last group; on the other side of this panel, open the electrodes Y'n- Y'-IL of the first group, then the electrodes of the other groups of the network Y ', to the electrodes Y' S I-Y ' S .L of the last group .
- each transformer T g comprises, with reference to FIG. 1 which partially represents this transformer in section, a primary circuit P g , L secondary circuits S g . ⁇ , ..., S g .j, ..., S g . L each supplying a pair of holding electrodes P g.
- each transformer T g here also has an electrical insulation sheet 5 placed between its primary circuit P g and its various secondary circuits S gi .
- All the pairs P g j of the same group g of coplanar electrodes are supplied by the different secondary S g ⁇ of the same transformer T g ; as there are eight groups of electrode lines here, the panel includes eight transformers Ti, ..., T g , ..., T 8 .
- Each secondary circuit S g ⁇ has, in addition to its “high” SH g j and “low” SB gi terminals, connected directly and without an intermediate switch respectively to the electrode Y gi and Y ' gi of the same pair P g ⁇ d 'electrodes, an addressing terminal connected approximately to the midpoint of this secondary circuit, that is to say having an average potential between that of the high and low terminals; according to a preferred variant of the invention shown in Figure 3, the addressing terminals of a single secondary circuit S gi for each transformer T ⁇ , ..., T g , ...
- T 8 are connected together and form a common terminal SMj of the midpoints of the secondary S g j of all the lines or pairs of electrodes P g ⁇ numbered i from the different groups 1, ..., g, 8; as there are L lines or L pairs per group, there are in total L secondary circuit addressing terminals SM-i, ..., SMj, ..., SM; thus, as will be seen below, the means for controlling the panel comprise only a reduced number of line drivers, each line driver being used to control a line in each group, that is to say in total here 8 lines.
- each primary circuit P g has here, in addition to its “high” PH g and “low” PB g terminals, an intermediate terminal connected approximately to the midpoint of this primary circuit, c 'is to say having an average potential between that of the high and low limits; according to a preferred variant of the invention also shown in Figure 3, the intermediate terminals of the different primary circuits P g of the different transformers Ti, ..., T g , ...
- T 8 are connected together and form a single terminal common PM of midpoints of primaries P g ; thus, as will be seen below, the means for controlling the panel comprise only a single holding switch Rs and only a single polarization switch for writing R which make it possible to connect this common output of midpoints of the primaries PM either at the high potential Vs of a sustain generator Gs, or at the high potential V of a coplanar polarization generator for writing G; these two switches R s , Rw therefore serve as means of connection of one or the other of these generators to the primary circuits P g of the transformers; in FIG.
- these two switches Rs, Rw and these two generators G s , G w are grouped together in the same power sub-assembly 13 of the panel control means; in addition, storage capacities Cs and C w (not shown) are connected respectively to the terminals of the holding generators Gs and of polarization for writing G w , for recovering the inductive energy of the transformers, as described later in during the maintenance phases; as this capacity can be internal to the generators, it is not always represented in all the figures.
- the supply and control means of the plasma panel 1 include, in addition to the elements and characteristics already described:
- this subset 11 gather L line drivers to simultaneously control a secondary circuit S gi of each transformer Ti, ..., T g , ... T 8 , via the midpoint SMj common to these circuits; as each transformer supplies L lines, this subset 11 includes L pairs of switches, one of medium voltage Rswii, the other of write voltage R S EI, connected in series, o whose common point is connected to the midpoint SMj of the secondary circuits S g ⁇ of the various transformers T g , o whose extreme terminals are connected to the terminals of the medium voltage generator GM and of the write generator G E so that said midpoint SMj is at potential V M when the medium voltage switch R SM J is closed (the other being open) and either at the potential VM-V E when the medium voltage switch R S MEI is closed (the other being open) - see Figures 3, 8 and 9.
- a sub-assembly 12 adapted to generate signals relating to operations for piloting the panel other than those for maintaining or addressing, such as starting or erasing operations; this subset is known in itself and will not be described here in detail.
- V ' w Vw / 7), where H is the number of groups of lines here equal to 8; this antipolarization voltage generator G'w has a storage capacity in parallel C'w not shown, generally intrinsic to the generator; - between the high potential terminal of this antipolarization voltage generator G'w and the common point of the low terminal PB g of each primary circuit P g and its “low” switch R B. 9 , a switch of antipolarization R ′ g and an antipolarization diode D'wg in series, the diode being oriented blocking in the direction of said low terminal PB g of the primary circuit P g .
- the transformation ratio of the different transformers T g is here 1, or 2/1 if only the primary half-loops are taken into account (see below); other relationships can be envisaged without departing from the invention, by adapting the voltages delivered by the various generators accordingly in a manner known to those skilled in the art.
- the supply transformers of the pairs of coplanar electrodes Ti, ..., T g , ..., TH are arranged and fixed on the external face of the rear panel 2; preferably, in this case, the magnetic coupling means M g of these transformers are formed of hollow tubes of flattened section; preferably, these magnetic coupling means of each transformer T g are arranged on the panel at a height corresponding to the average height of the lines or pairs of electrodes P gi supplied by this transformer T g , so as to limit the surface of the loop formed by each secondary circuit and the pair it supplies; this advantageously limits the electromagnetic radiation from the panel; moreover, such an arrangement is particularly economical.
- transformers For conventional plasma panels and control modes, as an example of transformers that can be used, mention will be made of conventional switching power supply transformers with magnetic energy storage, provided that they are capable of operating at the supply frequencies of the plasma panels, generally around 200 kHz; these transformers are qualified as “fly back” in English.
- Each sustain voltage pulse causes the charge of the electrical capacitance developed between the electrodes of the different pairs of the panel; taking into account the high frequencies of the holding pulses and the large number of electrodes on a plasma panel, this charge corresponds to a large capacitive energy; to improve the energy efficiency of the panel, it is known to provide, between each holding pulse, a capacitive energy recovery time. As illustrated in FIG.
- each holding period ⁇ s is broken down successively into a first time D1 of recovery of inductive energy during a first discharge F, a first time D2 of accumulation of inductive energy, a first time R of reversal of the polarities of the capacitance of the panel, a second time D'1 of inductive energy recovery during a second discharge F ', a second time D'2 of accumulation of inductive energy, and a second time R' of reversal polarities of the panel capacity;
- a maintenance phase Qs generally comprises several identical successive periods ⁇ s . As illustrated in Figures 4 to 6, during a whole maintenance phase
- the holding switch Rs is closed and the polarization switch for writing Rw is open, so that the voltage of the intermediate terminal PM of the various primary circuits is equal to V s .
- the first maintenance period ⁇ si of each maintenance phase is longer than the following periods ⁇ s, which advantageously makes it possible to take into account the spreading of the discharges Fi which generally occurs during the first holding pulse.
- the panel control means make it possible: - on the one hand to obtain a mantian voltage signal in the form of a niche with high and low steps, where the times R and R ' of polarity reversal are short enough for the plasma discharges to take place outside of these reversal times during the times D1, D'1 of inductive energy recovery, which makes it possible to obtain a reproducible and usable memory effect; - on the other hand, to recover the capacitive energy during the maintenance phases.
- the inductance of each of the transformers is defined as follows:
- L P is the inductance of a primary, or a secondary circuit of this transformer
- L P / 4 is the inductance of a primary half-circuit corresponding to half of the total number of windings of the entire primary, or secondary circuit.
- - I m is the magnetizing current flowing in one or other of the primary half-circuits of this transformer, depending on the position of the switches; the current during the reversal of the polarities corresponds to the maximum in absolute value of the magnetizing current, ie l m _ p , - V s is the peak maintenance voltage which corresponds to the high or low bearing voltage;
- V s 90V, which corresponds to alternating pulses of +/- 180V (see Figures 10 and 12), we have:
- the peak current is therefore equal to 8.6 A in the primary half-circuits during the times R, R 'of reverse polarity; the sum of the magnetizing currents in the secondary circuits coupled to this primary circuit therefore equals 4.3 A at the time of the reversals of polarities.
- the magnetization current l m participates in the panel discharge current; the current which must be able to withstand the “high” switches R PHg or “low” R PBg of the primary half-circuits during discharges will therefore advantageously be reduced by the same amount, which makes it possible to save on these components.
- the supply and control means according to the invention make it possible, during the holding phases, to obtain a succession of pulses having alternately high and low bearings which are capable of causing light discharges during these bearings; it is important that the polarity reversal time ⁇ R be adapted so that the discharges, when they occur, are triggered during these stages and not during the polarity reversal times, ie as in the pulse generators holding for plasma panels of the prior art, where ⁇ R is generally less than 1 ⁇ s, for example of the order of 500 ns as in the example above; the maximum admissible value of ⁇ R depends in a manner known in itself on the characteristics and technology of the plasma panel.
- the pulses delivered to the terminals of the primary circuits of the various transformers are slightly offset or phase-shifted, so as to obtain a staggering of the plasma discharges of a group of pairs P gl , ..., P g L of electrodes to another group of pairs P g > ⁇ , ..., P ⁇ > L of electrodes, in a manner analogous to the staggering described in the document US 4316123; this limits the "peak" intensities in the generator, allowing more economical components to be used.
- the polarization switch for writing Rw is closed and the holding switch Rs is open, so that the voltage of the intermediate terminal PM of the various primary circuits is equal to Vw- As illustrated in Figures 8 and 9 , throughout the addressing phase Qw for controlling the panel, the “high” switch R P H 9 of the primary circuit P g of the transformer T g remains open.
- the succession of these two alternations forms a period of polarization for writing; in a conventional manner, methods for addressing plasma panels, to facilitate the activation of discharge zones of the panel by application of write pulses and simultaneous data pulses between electrodes of the data network X and perpendicular electrodes of the network Y serving both for holding and for addressing, the latter electrodes are polarized; during the first alternation of high amplitude and short duration of each oscillation, such polarization conditions are met; as described below, we will therefore execute the writing operations during the first half-waves of the polarization oscillations.
- the succession of these two half-waves corresponds to an oscillation regime in a lower primary half-loop including the write polarization switch 'Rw and the lower part of the primary circuit of the transformer T g ;
- the write bias voltage Vw is applied for a duration ⁇ w between the intermediate terminal PM and the low terminal PB g of this part of the primary circuit;
- the antipolarization voltage V ' w of the second half-wave is such that: Vw x ⁇ w
- the “low” switch R PBg of the primary circuit P g is closed, so that the polarization generator G applies the voltage V between the intermediate terminal of the primary P g and the “low” terminal PB g of this primary; as indicated by the thick gray line and the arrow in the figure, an electric current flows in the loop which includes the polarization switch Rw and the lower part of the primary circuit P g and which closes here by the "low” switch R PBg of this circuit and the bias voltage generator Gw; by magnetic coupling, a potential difference equal to 2V is then generated between the electrodes Y g j and Y ' g j; at a given writing time and for a writing time ⁇ E much less than ⁇ , the medium voltage switch R S MI is opened and the write switch Rs ME i is closed so that the voltage applied to the point medium SMj of the secondary circuit supplying the electrodes is equal to V M -V E ; thus, during the entire first alternation of polarization ⁇ w represented in FIG. 8, the “low
- V'w x ⁇ 'w Vw x ⁇ w-
- the loop passing through the antipolarization diode D'w.g and the antipolarization switch R'w.g also passes, as indicated above and as shown in the figures, by an antipolarization generator G ' w advantageously delivering a constant voltage, which would not allow a simple capacitance to be obtained.
- the number of subgroups M is equal to the number of lines per group
- L N x M.
- a succession or “train” of oscillations is formed, formed by a first half and an opposite half as previously described, as illustrated in Figure 1,; in this figure, the curve in solid line corresponds to the potential applied to electrodes of the first group of the network Y, being used at the same time for addressing and maintenance, and the curve in dotted line corresponds to the potential applied to electrodes of the first network group Y ', used only for maintenance; according to the preferred method of addressing the panel:
- the oscillations of the first transformer Ti correspond to the following succession of periods: a first period comprising the half-waves ⁇ wn, ⁇ 'wn to address the N lines of the first subgroup Z- 11 of the first group, a second period comprising the half-waves ⁇ wi 2 , ⁇ 'wi2 to address the N lines of the second subgroup Z ⁇ 2 of the first group, ..., a j th period comprising the alternations ⁇ W ij, ⁇ 'wij to address the N lines of the j th subgroup Z ] of the first group, ..., until the last M th period comprising the alternations ⁇ i M , ⁇ 'w tM to address the N lines of the last ZIM subgroup of the first group;
- the procedure is the same as for the first transformer Ti using trains of analogous oscillations.
- the operations of addressing the lines of each group g and the oscillation trains associated with these operations can be applied successively, but this embodiment of the piloting method according to the invention results in far too long duration of the global phase d addressing Qw which is detrimental to the luminance of the panel.
- the addressing oscillation trains of the different groups of lines g and of the transformers Ti, T 2 , etc. are entangled as indicated below.
- each oscillation train of a transformer T g is started at the end of the first alternation of polarization ⁇ w (gi) .
- ⁇ of the first subgroup Z (g -i ) i of the train of oscillations previously launched, that of the transformer T (g _i ) is started at the end of the first alternation of polarization ⁇ w (gi) .
- ⁇ of the first subgroup Z (g -i ) i of the train of oscillations previously launched, that of the transformer T (g _i ) ; as, whatever the group g and its train of oscillations, we have ⁇ 'wn (H-1) x ⁇ g.
- the operating mode of the plasma panel is now completely described according to the first embodiment of the invention, at least in the selective addressing phase Qw followed by the non-selective holding phase Qs; the other piloting operations, in particular the priming phase Q and the erasing phase Qo, are known to those skilled in the art and are not described here in detail; the sub-assembly 12 shown in FIG. 3 and previously cited is used for this purpose; alternatively, the priming and erasing signals can be applied to the electrodes of the data network X.
- FIGS. 13A to 18A and 19 we will now describe more briefly a display device provided with the same plasma panel as above but with supply and control means according to a second embodiment of the invention as shown in FIGS. 13A to 18A and 19; in these figures, the references have been simplified: Y and Y 'for the coplanar electrodes, R H and R B for the "high” and “low” switches, D H and D B for the "high” and “low”diodes; an essential difference is due to the division of each primary circuit into two primary sub-circuits P1 and P2, one terminal of which is common only during the holding phases, when the switch R s is closed; such an arrangement simplifies the generator of holding pulses and polarization oscillations; FIG. 19 illustrates well, with the same references as in FIG.
- Figures 13A and 15A correspond to Figures 4 and 5 which illustrate half of a maintenance period;
- FIG. 14A has been added which describes the polarity reversal time which was not previously illustrated; with regard to each of Figures 13A, 14A, 15A, there is shown in Figures 13B, 14B, 15B the evolution of the holding voltage and the magnetization current l m ; the solid line part of these curves corresponds to the time of the holding period illustrated opposite.
- FIGS. 16A, 17A and 18A illustrate half of a period of polarization oscillation during the writing phase of the plasma panel; the man of profession immediately deduces from the previous explanations the other half of this period, symmetrical to the first; in this second embodiment, we see that each period of polarization oscillation breaks up successively into a first time D1 w of inductive energy recovery, a first time D2 W of accumulation of inductive energy, a first time R w reverse polarity, a second time D'1 w of inductive energy recovery, a second time D'2 W of accumulation of inductive energy, and a second time R ' w of reverse polarity; an addressing phase generally comprises several successive periods of polarization oscillations, as indicated above in order to be able to address all the lines of the panel; FIGS.
- 16A, 17A and 18A respectively illustrate the times D2 W where R B is closed and R H open, R w where the switches R H and R B are open, D'1 W where the switches R H and R B are also open and where the magnetization current flows in the "high" primary P1 passing through the diode D H ; with reference to each of these figures, the corresponding figures 16B, 17B and 18B illustrate the evolution of the bias voltage and the magnetization current l m .
- the voltage signal between the electrodes Y, Y ' has, for each complete period, a low plateau of high amplitude and of short duration and a high plateau of low amplitude and of long duration duration; the area above the bottom landing is equal to the area below the top landing; in the case where the number H of transformers is 8, the DC voltages V w and V s delivered by the generators and the management of the switches R H and R B are adapted so that the duration of the high plateau is approximately 7 times longer than that of the low level, and so that the amplitude of the high level is approximately 7 times smaller than that of the lower bearing.
- the supply and control means according to this second embodiment are advantageously simpler than those previously described according to the first embodiment, because they comprise a smaller number of components and because they are simpler to pilot; it can also be seen that, according to this second embodiment, the capacitive energy dissipated between the electrodes during polarization oscillations is advantageously recovered and re-injected.
- the present invention has been described with reference to a plasma panel provided with two arrays of holding electrodes arranged in pairs on the internal face of the front panel of this panel; the invention is also applicable to cases where these two arrays of holding electrodes are arranged on the internal face of the rear panel, or even between the panels; the invention is also applicable to cases where these two networks are not coplanar; the invention is also applicable to plasma panels provided with three networks of holding electrodes arranged in triads, instead of pairs as previously described; such panels are described in particular in document FR 2790583 (SAMSUNG).
- the present invention has been described with reference to a control method in which the holding signals are applied only between coplanar electrodes; the invention also applies to control methods where the coplanar holding discharges are triggered by so-called “matrix” discharges which are initiated between the panels of the panel and which presuppose the application of holding signals also to the data electrodes during the maintenance phases; such methods are known in the art anterior and allow, on condition of increasing the distance or gap separating the coplanar electrodes, to significantly improve the light output.
- An essential advantage of the plasma display panel provided with networks of holding electrodes and provided with supply and control means according to the invention is, as illustrated by the control process which has just been described, of being able to completely dissociate, at the level of the supply of the holding electrodes, on the one hand the application of the so-called power pulses, such as the holding and coplanar polarization write pulses, on the other hand the application of the pulses d 'writing, while using, as in the prior art, an array of Y electrodes for both the maintenance and the addressing.
- the invention is based on the use of coupling means, here magnetic, for supplying the holding electrodes for the power operations which relate to the holding and the polarization for writing.
- coupling means in particular magnetic, makes it possible to make each of the pairs (if necessary of triads) of holding electrodes floating.
- coupling means in particular magnetic means, are used to supply the holding electrode pairs with power pulses, such as the holding and coplanar polarization write pulses, the electrical circuits through which these transits pass considerably pulses; unlike the prior art, these pulses do not pass through the line drivers; this simplification brings an important economic advantage.
- transformers as coupling means, as the electromagnetic radiation from the transformer connections is opposed to that of the electrodes supplied by these transformers, the electromagnetic radiation of the panel is substantially reduced; other advantages result from the method of supplying the electrodes according to the invention: - the strong reduction in ground loopbacks compared to conventional circuits of the prior art;
- the invention also provides the following advantages:
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2004-7012820A KR20040086398A (ko) | 2002-02-25 | 2003-02-17 | 트랜스포머를 이용한 플라스마 패널 전원공급 및 제어 수단 |
AU2003222570A AU2003222570A1 (en) | 2002-02-25 | 2003-02-17 | Means of powering and controlling a plasma panel using transformers |
US10/507,158 US20050140592A1 (en) | 2002-02-25 | 2003-02-17 | Supply and drive means for a plasma panel using transformers |
JP2003572017A JP2005522714A (ja) | 2002-02-25 | 2003-02-17 | トランスを用いるプラズマパネルのための供給及び駆動手段 |
EP03717402A EP1479062A1 (fr) | 2002-02-25 | 2003-02-17 | Moyens d alimentation et de pilotage pour panneau a plasma u tilisant des transformateurs. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0202328A FR2836587A1 (fr) | 2002-02-25 | 2002-02-25 | Moyens d'alimentation et de pilotage pour panneau a plasma utilisant des transformateurs |
FR02/02328 | 2002-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003073406A1 true WO2003073406A1 (fr) | 2003-09-04 |
Family
ID=27676031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/000496 WO2003073406A1 (fr) | 2002-02-25 | 2003-02-17 | Moyens d'alimentation et de pilotage pour panneau a plasma utilisant des transformateurs. |
Country Status (9)
Country | Link |
---|---|
US (1) | US20050140592A1 (fr) |
EP (1) | EP1479062A1 (fr) |
JP (1) | JP2005522714A (fr) |
KR (1) | KR20040086398A (fr) |
CN (1) | CN1639760A (fr) |
AU (1) | AU2003222570A1 (fr) |
FR (1) | FR2836587A1 (fr) |
TW (1) | TWI227453B (fr) |
WO (1) | WO2003073406A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006106043A2 (fr) * | 2005-04-04 | 2006-10-12 | Thomson Licensing | Dispositif d'entretien destine a un ecran a plasma |
CN100395800C (zh) * | 2004-10-25 | 2008-06-18 | 南京Lg同创彩色显示系统有限责任公司 | 能量回收装置 |
US7414620B2 (en) | 2004-09-24 | 2008-08-19 | Lg Electronic Inc. | Energy recovery apparatus and method of a plasma display panel |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1640948A1 (fr) * | 2004-09-25 | 2006-03-29 | LG Electronics Inc. | Dispositif et procédé de récupération d'énergie pour un panneau d'affichage à plasma |
KR100778417B1 (ko) | 2006-11-20 | 2007-11-21 | 삼성에스디아이 주식회사 | 플라즈마 표시 장치 및 스위칭 모드 파워 서플라이 |
CN101685601B (zh) * | 2008-09-28 | 2011-06-08 | 四川虹欧显示器件有限公司 | 用于等离子显示器的电平发生电路 |
Citations (3)
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US3559190A (en) * | 1966-01-18 | 1971-01-26 | Univ Illinois | Gaseous display and memory apparatus |
US4100535A (en) * | 1976-11-02 | 1978-07-11 | University Of Illinois Foundation | Method and apparatus for addressing and sustaining gas discharge panels |
FR2741741A1 (fr) * | 1995-11-24 | 1997-05-30 | Nec Corp | Circuit de commande de panneau d'affichage |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4533913A (en) * | 1983-04-06 | 1985-08-06 | Burroughs Corporation | Gas-filled dot matrix display panel and operating system |
JP3201603B1 (ja) * | 1999-06-30 | 2001-08-27 | 富士通株式会社 | 駆動装置、駆動方法およびプラズマディスプレイパネルの駆動回路 |
JP4512971B2 (ja) * | 2001-03-02 | 2010-07-28 | 株式会社日立プラズマパテントライセンシング | 表示駆動装置 |
-
2002
- 2002-02-25 FR FR0202328A patent/FR2836587A1/fr active Pending
-
2003
- 2003-02-17 EP EP03717402A patent/EP1479062A1/fr not_active Withdrawn
- 2003-02-17 KR KR10-2004-7012820A patent/KR20040086398A/ko not_active Application Discontinuation
- 2003-02-17 WO PCT/FR2003/000496 patent/WO2003073406A1/fr active Application Filing
- 2003-02-17 CN CNA038044129A patent/CN1639760A/zh active Pending
- 2003-02-17 JP JP2003572017A patent/JP2005522714A/ja not_active Withdrawn
- 2003-02-17 US US10/507,158 patent/US20050140592A1/en not_active Abandoned
- 2003-02-17 AU AU2003222570A patent/AU2003222570A1/en not_active Abandoned
- 2003-02-21 TW TW092103589A patent/TWI227453B/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3559190A (en) * | 1966-01-18 | 1971-01-26 | Univ Illinois | Gaseous display and memory apparatus |
US4100535A (en) * | 1976-11-02 | 1978-07-11 | University Of Illinois Foundation | Method and apparatus for addressing and sustaining gas discharge panels |
FR2741741A1 (fr) * | 1995-11-24 | 1997-05-30 | Nec Corp | Circuit de commande de panneau d'affichage |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7414620B2 (en) | 2004-09-24 | 2008-08-19 | Lg Electronic Inc. | Energy recovery apparatus and method of a plasma display panel |
CN100395800C (zh) * | 2004-10-25 | 2008-06-18 | 南京Lg同创彩色显示系统有限责任公司 | 能量回收装置 |
WO2006106043A2 (fr) * | 2005-04-04 | 2006-10-12 | Thomson Licensing | Dispositif d'entretien destine a un ecran a plasma |
FR2889345A1 (fr) * | 2005-04-04 | 2007-02-02 | Thomson Licensing Sa | Dispositif d'entretien pour panneau plasma |
WO2006106043A3 (fr) * | 2005-04-04 | 2007-12-13 | Thomson Licensing | Dispositif d'entretien destine a un ecran a plasma |
JP2008535008A (ja) * | 2005-04-04 | 2008-08-28 | トムソン ライセンシング | プラズマパネル用サステイン装置 |
US8115701B2 (en) | 2005-04-04 | 2012-02-14 | Thomson Licensing | Sustain device for plasma panel |
Also Published As
Publication number | Publication date |
---|---|
AU2003222570A1 (en) | 2003-09-09 |
KR20040086398A (ko) | 2004-10-08 |
TW200303508A (en) | 2003-09-01 |
FR2836587A1 (fr) | 2003-08-29 |
TWI227453B (en) | 2005-02-01 |
US20050140592A1 (en) | 2005-06-30 |
EP1479062A1 (fr) | 2004-11-24 |
CN1639760A (zh) | 2005-07-13 |
JP2005522714A (ja) | 2005-07-28 |
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