EP1500121A1 - Panneau de visualisation a plasma a excitation des decharges par rayonnement micro-onde - Google Patents
Panneau de visualisation a plasma a excitation des decharges par rayonnement micro-ondeInfo
- Publication number
- EP1500121A1 EP1500121A1 EP03747462A EP03747462A EP1500121A1 EP 1500121 A1 EP1500121 A1 EP 1500121A1 EP 03747462 A EP03747462 A EP 03747462A EP 03747462 A EP03747462 A EP 03747462A EP 1500121 A1 EP1500121 A1 EP 1500121A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- panel
- microwave
- discharge
- electrodes
- cells
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
- H01J11/20—Constructional details
- H01J11/34—Vessels, containers or parts thereof, e.g. substrates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
-
- 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
- G09G3/2807—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 with discharge activated by high-frequency signals specially adapted therefor
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/38—Cold-cathode tubes
- H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
- H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
Definitions
- the invention relates to a plasma display panel with excitation of discharges by microwave radiation and a method for controlling this panel.
- the basic principle of the operation of plasma screens is based on the initiation and maintenance of plasma discharges, between two electrodes, in elementary cells filled with discharge gases forming a two-dimensional matrix network between two flat plates, generally made of glass. . These electrodes are covered with dielectric layers to provide a well-known memory effect, hence the need to use pulse-shaped maintenance voltages or alternative maintenance voltages to produce the discharges.
- the plasma display panel technologies (“PDP”) developed to date can be grouped into two categories: AC - PDP and RF - PDP.
- the dielectric layers covering the electrodes between which the discharges emerge act as capacitors capable of storing electrical charges, which gives a memory effect to the cells in which a discharge has taken place.
- On this memory property rests the addressing of the cells at the start of each scan or underscan of image to be displayed, by application of low frequency addressing voltage pulses, regardless of the “PDP” structure.
- the voltage of these addressing pulses is adapted to deposit electrical charges on the walls of the cells at a level adapted so that the maintenance signals allow the generation of discharges only in the addressed areas.
- the essential difference between the two technologies AC and RF consists, therefore, in the mode of maintenance of the discharges during the underscan of the images: low frequency and radio frequency, respectively.
- the two modes are distinguished by the very principle of operation of the discharges, but here only the aspects which concern more particularly the plasma panels are retained: the luminous efficiency and the lifetime of the cell surfaces: i.
- the AC discharge mode leads to the formation of a very energetic cathode sheath which decreases the share of electronic energy dissipated in the excitation of the rare discharge gas in the cells and, consequently, a reduction in the production of photons. VUV. This results in poor light efficiency, but also a short lifetime of the surfaces of the cell structure due to their bombardment by energetic ions from the discharges.
- ii. As illustrated in FIG. 1, in an RF discharge, the potential difference between the plasma Vsh and the electrodes Vr £ is practically half of the potential applied to the electrodes and, therefore, the ions have an energy divided practically by two compared to those of a landfill
- the share of energy attributed to electrons is estimated at 75% compared to only 40% in an AC structure. Decreasing the energy of the ions in the sheath improves the light efficiency and increases the lifespan of the cell surfaces.
- the dielectric layers are generally coated with protective layers, generally based on magnesia (MgO), which also serve for the emission of secondary electrons under ion bombardment.
- MgO magnesia
- the object of the invention is to remedy the intrinsic drawbacks of plasma screens using plasma cells operating in the dielectric barrier discharge mode with low frequency or radio frequency maintenance.
- the subject of the invention is a plasma display panel comprising a front panel and a rear panel providing between them a two-dimensional matrix of zones filled with discharge gas, characterized in that it comprises a device for generation of microwave electromagnetic radiation suitable for applying, through said rear panel to all of said discharge zones, microwave radiation of sufficient intensity to generate plasma discharges in the discharge zones.
- the display panel obtained is, much simpler and more economical, to the display devices described in documents EP0511282 and EP0377442, which are based on a two-dimensional array of fluorescent lamps without electrodes.
- the display panel according to the invention also comprises addressing means for selectively activating preselected discharge zones by depositing electric charges thereon, and the device for generating microwave electromagnetic radiation is suitable for applying radiation. microwave of sufficient intensity to generate plasma discharges only in the activated discharge zones.
- the microwave field therefore serves to maintain the plasma discharges in the addressed cells, but, according to the preferred embodiment of the invention, its amplitude alone is insufficient to generate discharges in the non-activated or addressed cells; preferably, the addressing means also serve not only to trigger the discharges in the preselected zones or cells as soon as the microwave field is applied to the entire panel, but also to re-trigger these discharges at a level of sufficient intensity during application of the field microwave ; these “re-trips” ensure the maintenance of the charges in the volume of the cells or activated zones.
- the invention can also have one or more of the following characteristics: - the device for generating microwave electromagnetic radiation is adapted to generate microwaves of frequency greater than 200 MHz.
- the rear panel has no electrode network, no conductive layer or segment of conductive layer; the rear panel is made of a dielectric material having low dielectric losses in the frequency range of said microwave radiation.
- the rear panel is transparent to microwave radiation; this rear panel can for example be made of glass.
- the front panel comprises at least two networks of electrodes for addressing, each electrode of a first network crossing each electrode of a second network at the location of a discharge zone of the two-dimensional network of zones of dump.
- the front panel comprises three networks of electrodes, including two networks of paired and coplanar parallel electrodes.
- the subject of the invention is also a method for driving the panel according to the invention comprising a succession of image scans and sub-scans, in which each sub-scan comprises a phase of addressing preselected cells using means for addressing the panel and a holding phase, characterized in that the microwave field is applied to all the cells of the panel during the holding phase.
- This microwave field can be applied continuously throughout the holding phase, or discontinuously.
- a conventional “low-frequency” signal is applied to maintain the charges. in volume in the addressed areas.
- the invention proposes a new cell structure based on the increase in the frequency of the maintenance signal of the discharge even in the microwave field (f> 200 MHz).
- f the frequency of the maintenance signal of the discharge even in the microwave field
- the solution provided by the invention consists preferably in addressing the cells with low frequency signals, according to current techniques and circuits of commercial panels, and in maintaining the discharge by a high frequency field in the microwave field. (f> 200 MHz).
- the advantages of the invention are mainly the following: a)
- the main advantage of the invention is the increase in light efficiency. Indeed, the energy dissipated in a microwave plasma is entirely devoted to the excitation and the ionization of the gas.
- the absence of plasma holding electrodes means that, apart from the low frequency pulses, there is no ion bombardment and spraying of the walls, and therefore little or no energy dissipated in this form.
- the cell walls of the panel are at floating potential, which means that the energy of the ions striking these walls does not exceed ten electron volts.
- the lifetime of the magnesia protective layer increases considerably, which significantly improves the lifetime of the panel.
- the electronic population of a microwave plasma generally has an energy distribution function close to a Maxwell curve of a few eV, depending on the pressure range, while that of a low or radio frequency discharge is a function which also has a large population of very energetic electrons, the secondary electrons. These very energetic electrons favor ionizations and excitations of ⁇ high energy levels to the detriment of excitations of low energy levels, mainly responsible for the production of UV photons.
- the absence of this electronic population in a microwave plasma therefore makes it much more efficient for UV production.
- a good light output of the cells can be obtained by choosing gases or mixtures of gases making it possible to optimize the production of UV photons.
- a key advantage of this invention is that, the injection of power by the rear face on the one hand, and the addressing of the cells by electrodes on the front face on the other hand, will take different channels thus allowing a separation of duties.
- Another advantage is the simplicity of the technology proposed both in terms of the structure of the cells and in terms of their addressing. For example, the array of row and column electrodes can be produced by simple crossing technology, with narrow width electrodes.
- FIG. 1 illustrates a comparison of the operation of the AC structure and RF structure panels of the prior art, at the landfills
- VSH sheath voltage in the discharge
- Vp £ electrode voltage in the cell where the discharge takes place
- FIG. 2 illustrates the timing diagrams for applying the addressing voltage signals S / ⁇ , S / ⁇ respectively to the electrodes X and Y, and microwave signals SMW on the rear face according to one embodiment of the method of control of a plasma panel according to the invention
- FIG. 3 shows a schematic sectional view respectively of the front panel, the rear panel, and the entire plasma panel, according to an embodiment according to the invention
- - Figure 6 shows a top view of a variant of the panel according to Figure 5, where the crossings of the electrodes of the front panel are off-center relative to the center of the cells;
- FIG. 7 shows a variant of the panel according to Figure 5, where the front panel comprises three electrode networks including two parallel electrode networks, paired and coplanar.
- FIG. 8 shows a top view of a variant of the panel according to Figure 7, where each electrode of the paired networks serves for two adjacent cell lines and is placed above the barriers separating the cells;
- FIG. 9 illustrates a timing diagram of the voltages applied to the line electrodes Y n _ ⁇ , Y n , and Y ⁇ r for triggering discharges in the panel of Figure 8;
- 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.
- the production of the plasma panel according to the invention will now be described; we begin with the description of the front panel, then of the rear panel, intended for the manufacture of this panel. i) as illustrated in FIG. 3, the addressing and triggering of the discharge are carried out using a matrix array of electrodes located on the front panel slab.
- the two networks are separated by a layer of dielectric 2.
- the second network of electrodes is coated with a dielectric layer 2 and with a protective layer based on magnesia 3, the latter also having the role of emitting surface of secondary electrons.
- the thickness of the dielectric layer 2 is adapted in a manner known per se, in particular to the nature and the pressure of the discharge gas which will fill the panel. ii) the application of microwave power in a discharge does not take place using electrodes and, consequently, the structure of the slab rear, by which the microwaves are applied, must be designed appropriately. As illustrated in FIG.
- the rear face is completely free from any electrode or conductive layer, and mainly comprises a substrate 4 made of dielectric material with low loss, rigid and waterproof.
- the dielectric material is preferably at low losses in the frequency range of the microwaves used.
- This substrate 4 comprises a network of barriers 5 forming cells adapted to be centered on the crossings of the electrodes X and Y of the front panel.
- the walls of these cells are coated with phosphors 6R, 6B, 6G in order to obtain, under the excitation of the ultraviolet emission of plasma discharges, photons visible in the three basic colors of image display: red , green and blue. These cells form the cells of the panel.
- the front panel and the rear panel are then assembled in a manner known per se, by superimposing them so that each crossing of electrodes of the front panel coincides with a cell in the rear panel.
- the pressure of the discharge gas within such a microwave maintenance panel will preferably be lower, for example by a factor of about 10, compared to the pressure of discharge gas within conventional plasma panels with AC maintenance. .
- the plasma panel is then provided on the rear face with a microwave device suitable for applying a microwave field over the entire surface of the substrate 4 made of dielectric material corresponding to the active part of the panel.
- the structure of the panel obtained is presented in FIGS. 5 and 6.
- the microwave device comprises a field amplitude regulator imposing an upper limit during each image underscan determined by the holding field, corresponding to the maintenance voltage, supplemented by a voltage margin corresponding to around twenty volts per cell.
- the amplitude of the field is adapted in a manner known per se to be able to ensure the maintenance of the set of cells of the panel, but low enough not to produce the priming of unaddressed cells.
- the rear face of the panel is provided with microwave shielding 8. On the front face, the microwave shielding is provided by the matrix array of electrodes.
- the position of the X and Y electrodes can be offset from the center of the cells in order to increase the transparency of the front panel to visible radiation, while remaining far enough from the barriers not to increase by the ignition voltages considerably.
- FIG. 7 represents a variant of the panel according to FIG. 5, where the front panel comprises three networks of electrodes including two networks of electrodes Y ′ parallel, paired and coplanar; the components referenced bear (with the sign “'” near) the same references as the components referenced in FIG. 5; reference 10 corresponds to the magnesia layer; the reference Y'B corresponds to an opaque conductive bus applied to the transparent electrodes Y 'to increase their conductivity;
- FIG. 8 represents a variant of the panel of FIG. 7, where each electrode of the paired networks serves for two rows of adjacent cells and is placed above the barriers separating the cells; it thus advantageously spares, for each cell, the widest opening for the passage of light; two consecutive “line” electrodes therefore form a pair for the line of cells which they frame, which makes it possible to obtain a large gap at the level of each cell; the protuberances placed on the “line” electrodes at the level of each cell facilitate the initiation of discharges.
- FIG. 9 illustrates a chronogram of the voltages applied to the line electrodes Y ⁇ l , Y n , and Y n + l for triggering discharges in the panel of FIG. 8, with a suitable pulse V x applied by the electrode of column X in particular during the addressing phases.
- FIG. 2 which consists: a) in addressing the cells by application, between the line X electrodes or scanning electrodes and the electrodes column Y or data electrodes, with a pulse of amplitude V ⁇ + V ⁇ greater than the plasma ignition voltage. The discharges thus initiated lead to the creation of the memory charge on the surface in the addressed cells.
- a “low-frequency” signal Ss-BF.1 is applied in all the discharge zones of the panel.
- the maintenance of the charges in volume that is to say the creation of the charges which compensate for the losses by diffusion to the walls and by recombination, is taken up by the microwave field applied to the entire surface of the set of cells. In accordance with point b, this field is not sufficient to initiate the discharge in unaddressed cells.
- the operating margins are determined by the low frequency breakdown and microwave extinction voltages since, during the microwave discharge maintenance of the plasma discharge, the memory charge is completely erased, no longer influencing the extinction voltages.
- the last timing diagram I very schematically represents the intensity of ultraviolet light emission from the discharges resulting from the control mode which has just been described.
- the present invention has been mainly described with reference to a plasma panel where the two networks of electrodes are carried by the front panel and where the barrier network is carried by the rear panel, with reference to a control mode where the microwave field is applied continuously during an image subscan; it is obvious to a person skilled in the art that it can be applied to other types of plasma panels or to other control modes without departing from the scope of the claims below.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (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)
- Gas-Filled Discharge Tubes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0205420 | 2002-04-30 | ||
FR0205420A FR2839198B1 (fr) | 2002-04-30 | 2002-04-30 | Panneau de visualisation a plasma a excitation des decharges par rayonnement micro-onde |
PCT/FR2003/001130 WO2003094189A1 (fr) | 2002-04-30 | 2003-04-10 | Panneau de visualisation a plasma a excitation des decharges par rayonnement micro-onde |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1500121A1 true EP1500121A1 (fr) | 2005-01-26 |
Family
ID=28800061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03747462A Withdrawn EP1500121A1 (fr) | 2002-04-30 | 2003-04-10 | Panneau de visualisation a plasma a excitation des decharges par rayonnement micro-onde |
Country Status (8)
Country | Link |
---|---|
US (1) | US20050162086A1 (fr) |
EP (1) | EP1500121A1 (fr) |
JP (1) | JP2005524120A (fr) |
KR (1) | KR20040104651A (fr) |
CN (1) | CN1650387A (fr) |
AU (1) | AU2003246807A1 (fr) |
FR (1) | FR2839198B1 (fr) |
WO (1) | WO2003094189A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108872716B (zh) * | 2017-05-12 | 2021-03-02 | 长春理工大学 | 外加磁场增强激光诱导空气等离子体微波辐射装置和方法 |
KR102149190B1 (ko) * | 2018-04-09 | 2020-08-28 | 경상대학교산학협력단 | 액중 방전 마이크로젯 약물 전달장치 |
KR102060416B1 (ko) * | 2018-04-18 | 2020-02-20 | 서울대학교 산학협력단 | 금속 콜로이드 제거를 통해 반복 분사시 젯의 분사 효율 저하를 방지하는 마이크로젯 분사 장치 |
KR102055439B1 (ko) | 2018-05-08 | 2019-12-16 | 서울대학교 산학협력단 | 마이크로 버블 선 생성을 통해 분사 효율을 향상시킨 마이크로젯 분사 장치 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5112231B1 (fr) * | 1970-08-10 | 1976-04-17 | ||
JPH0484188A (ja) * | 1990-07-27 | 1992-03-17 | Fujitsu General Ltd | ガス放電駆動型表示装置 |
US6271810B1 (en) * | 1998-07-29 | 2001-08-07 | Lg Electronics Inc. | Plasma display panel using radio frequency and method and apparatus for driving the same |
US6171810B1 (en) * | 1999-04-07 | 2001-01-09 | New York Blood Center, Inc. | Method for detecting and assaying exoglycosidase activity |
KR100565189B1 (ko) * | 1999-06-02 | 2006-03-30 | 엘지전자 주식회사 | 고주파 플라즈마 디스플레이 패널 |
FR2820871B1 (fr) * | 2001-02-15 | 2003-05-16 | Thomson Plasma | Procede de pilotage d'un panneau de visualisation a plasma de type coplanaire a l'aide de trains d'impulsions a frequence suffisamment elevee pour obtenir la stabilisation des decharges |
FR2834113B1 (fr) * | 2001-12-24 | 2004-06-04 | Centre Nat Rech Scient | Dispositif d'affichage a plasma et procede de commande de celui-ci |
-
2002
- 2002-04-30 FR FR0205420A patent/FR2839198B1/fr not_active Expired - Fee Related
-
2003
- 2003-04-10 CN CNA038097117A patent/CN1650387A/zh active Pending
- 2003-04-10 US US10/513,093 patent/US20050162086A1/en not_active Abandoned
- 2003-04-10 KR KR10-2004-7017325A patent/KR20040104651A/ko not_active Application Discontinuation
- 2003-04-10 JP JP2004502318A patent/JP2005524120A/ja not_active Withdrawn
- 2003-04-10 AU AU2003246807A patent/AU2003246807A1/en not_active Abandoned
- 2003-04-10 EP EP03747462A patent/EP1500121A1/fr not_active Withdrawn
- 2003-04-10 WO PCT/FR2003/001130 patent/WO2003094189A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO03094189A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2839198A1 (fr) | 2003-10-31 |
CN1650387A (zh) | 2005-08-03 |
FR2839198B1 (fr) | 2004-06-04 |
WO2003094189A1 (fr) | 2003-11-13 |
US20050162086A1 (en) | 2005-07-28 |
AU2003246807A1 (en) | 2003-11-17 |
KR20040104651A (ko) | 2004-12-10 |
JP2005524120A (ja) | 2005-08-11 |
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