EP0912991B1 - Tube fluorescent plat destine a l'eclairage de fond et dispositif d'affichage a cristaux liquides dote de ce tube fluorescent plat - Google Patents

Tube fluorescent plat destine a l'eclairage de fond et dispositif d'affichage a cristaux liquides dote de ce tube fluorescent plat Download PDF

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Publication number
EP0912991B1
EP0912991B1 EP98925418A EP98925418A EP0912991B1 EP 0912991 B1 EP0912991 B1 EP 0912991B1 EP 98925418 A EP98925418 A EP 98925418A EP 98925418 A EP98925418 A EP 98925418A EP 0912991 B1 EP0912991 B1 EP 0912991B1
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EP
European Patent Office
Prior art keywords
fluorescent lamp
flat
flat fluorescent
liquid crystal
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP98925418A
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German (de)
English (en)
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EP0912991A2 (fr
Inventor
Frank Vollkommer
Lothar Hitzschke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HITZSCHKE, LOTHAR, DR.
VOLLKOMMER, FRANK, DR.
Osram GmbH
Original Assignee
Hitzschke Lothar Dr
Vollkommer Frank Dr
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0912991A2 publication Critical patent/EP0912991A2/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/305—Flat vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/92—Lamps with more than one main discharge path

Definitions

  • the invention relates to a flat fluorescent lamp for backlighting according to the preamble of claim 1. Also relates to Invention a lighting system according to the preamble of the claim 18 with this flat fluorescent lamp. The invention further relates to a liquid crystal display device according to the preamble of Claim 19 with this lighting system.
  • flat fluorescent lamp here means fluorescent lamps with a flat geometry that emit white light. They are designed primarily for the backlighting of liquid crystal displays, also known as LCDs (L iquid C rystal D isplays) known.
  • LCDs Liquid C rystal D isplays
  • these are flat lamps with stripe-like Electrodes where either the electrodes of one polarity or all Electrodes, i.e. both polarities, by means of a dielectric layer of are separated from the discharge (one-sided or two-sided dielectric barrier Discharge).
  • Such electrodes are also shortened below referred to as "dielectric electrodes”.
  • strip-like electrode also shortening "Electrode strip” called - is here and below an elongated, in Compared to its length very thin and narrow structure understood that is able to act as an electrode.
  • the Edges of this structure are not necessarily parallel to one another. In particular, substructures should also be along the long sides of the strips be included.
  • the dielectric layer can through the wall of the discharge vessel itself be formed by the electrodes outside the discharge vessel, are arranged on the outer wall.
  • the dielectric layer can also be in the form of at least one partial cladding or layer of at least the anodic part of the electrodes arranged inside the discharge vessel can be realized.
  • This has the advantage that the thickness of the dielectric layer depends on the discharge properties can be optimized.
  • inner require Electrodes gastight current feedthroughs. This makes additional ones Manufacturing steps required, which usually makes the manufacturing more expensive.
  • Liquid crystal display devices are particularly used in portable Computers (laptop, notebook, palmtop or similar) recently also for stationary computer monitors used. Other areas of application are Information displays in control rooms of industrial plants or flight monitoring devices, View cash register systems and automatic Cash dispensing systems and televisions to name a few. Increasingly become liquid crystal display devices also in automotive engineering used for so-called driver information systems. Liquid crystal display devices need a backlight, which the entire liquid crystal display is illuminated as brightly and evenly as possible.
  • WO 94/23442 describes a method for operating an incoherently emitting Radiation source, in particular a discharge lamp, by means of dielectric disabled discharge disclosed.
  • the operating procedure sees one Sequence of active power pulses before, the individual active power pulses are separated from each other by dead times. This will burn between neighboring ones Electrodes of different polarities each have a large number more similar, in plan view, that is perpendicular to the plane in which the electrodes are arranged, delta-like ( ⁇ ) individual discharges. These single discharges are lined up side by side along the electrodes, whereby they widen in the direction of the (current) anode. In the case of changing Polarity of the voltage pulses of a double-sided dielectric barrier Discharge appears visually an overlay of two delta-shaped Structures.
  • a flat radiator is known from WO 94/04625, which corresponds the operating method of WO 94/23442 is operated. by virtue of Due to the very efficient mode of operation, the flat radiator produces relatively little Waste heat.
  • each is strip-shaped Electrodes arranged on the outer wall of the discharge vessel the disadvantages described at the beginning.
  • Another disadvantage of this solution is that the surface luminance drops significantly towards the edge.
  • the marginal radiation contribution from the neighboring ones Areas outside the discharge vessel.
  • make up the individual discharges preferentially between the anodes and only one of the two immediately adjacent cathodes. Form apparently not independent on both sides of the anode strips at the same time from each other single discharges. Rather, it cannot be predicted which of the two neighboring cathodes the discharges are from will train each. Based on the flat radiator as a whole, this results thereby an irregular discharge structure and consequently a temporal and spatially non-uniform surface luminance.
  • a uniform surface luminance is, however, for numerous applications such radiator is desirable.
  • backlighting LCDs demand a visual uniformity, their depth of modulation Does not exceed 15%.
  • DE-A-195 48 003 specifies a circuit arrangement with which Help unipolar pulse voltage sequences can be generated, such as in particular for the efficient operation of one-sided dielectric disabled Discharges are needed. Even on capacitive ones Loads - such as dielectric barrier discharge arrangements smooth pulse shapes achieved with low circuit losses.
  • EP 0 363 832 includes, among other things, a UV high-power lamp strip-shaped electrodes revealed on the inner wall of the base plate of the discharge vessel are arranged. About current feedthroughs for connecting the inner electrodes to a voltage source however, no information included.
  • the UV high-performance lamp is included sinusoidal AC voltage operated. As is known, the achievable UV yields in AC operation to less than approx. 15% limited. For efficient backlighting of LCD systems however, higher yields are required. It is also an embodiment indicated with cooling channels integrated in the base plate, what many applications, especially in the office and mobile Use is impractical.
  • EP 0 607 453 discloses a liquid crystal display with a surface lighting device known.
  • the area lighting device exists essentially of a plate-shaped light guide and at least a curved rod-shaped fluorescent lamp.
  • the fluorescent lamp is corresponding to the bend on two or more abutting edges arranged the light guide plate. This makes the light one Fluorescent lamp on the at least two edges in the light guide plate coupled in and through the plate surface facing the liquid crystal display scattered. This measure is intended to ensure good illumination can be achieved without a correspondingly large number of lamps being required.
  • the disadvantage of this solution is that a light guide plate is not dispensed with can be. There are also external reflectors along the lamps provided which part of the lamp light laterally in the light guide plate reflect.
  • Fluorescent lamps result from the properties of mercury itself.
  • the mercury must first reach its operating steam pressure, i.e. fluorescent lamps of this type have a pronounced start-up behavior, what a shutdown of a PC monitor equipped with it during makes a break from work seem unreasonable.
  • Mercury is harmful to health and must therefore be disposed of as hazardous waste become.
  • Another object of the present invention is an illumination system according to the preamble of claim 18. This The object is solved by the characterizing features of claim 18.
  • the basic idea of the first part of the invention is the inner Electrodes including bushings and external power supplies as three functionally different sections of a single cathode or on the anode-side contiguous structure similar to a conductor track train.
  • This concept allows the three functions mentioned to be different Parts - internal electrodes, bushings and external power supplies - virtually simultaneously in a common manufacturing step, preferably using printing technology. Compared to the state of the Technology is the number of handling and manufacturing steps significantly reduced. In addition, connections by means of soldering or the like are omitted. between the individual components.
  • the two structures also offer the advantage of almost any Formability. This makes it easy to manufacture and cost effective way up to a uniform area luminance to optimize the shape of the electrodes towards the edges. For that is e.g. only to design a structured printing screen accordingly.
  • the constructive concept is inexpensive Production of flat fluorescent lamps of almost any size enables since all manufacturing steps are practically independent of the size of the Spotlights can always be realized in the same way. It can be used to match Flat lamps for backlighting of different sizes Realize liquid crystal displays economically.
  • Other advantages are high luminance and high luminous efficacy, a typical specific Light intensity is approx. 8 cd / W for a lamp including an optical diffuser.
  • the discharge vessel consists of a base plate and one Ceiling plate built up, which by a frame and by means of solder, e.g. Glass solder, connected to one another to form a closed discharge vessel are.
  • solder e.g. Glass solder
  • One end of the electrode strips is through the solder led gastight to the outside.
  • the seal between implementation and Frame and between the frame and floor or ceiling plate takes over the solder.
  • the materials for solder and frame as well as floor and ceiling panels coordinated are the materials for solder and frame as well as floor and ceiling panels coordinated.
  • the thicknesses are preferably metallic Electrode strips chosen so thin that on the one hand the thermal stresses remain low and that, on the other hand, those required in operation Current strengths can be realized.
  • Typical thicknesses for Conductive silver strips are in the range from 5 ⁇ m to 50 ⁇ m, preferably in the range from 5.5 ⁇ m to 30 ⁇ m, particularly preferably in the range from 6 ⁇ m to 15 ⁇ m.
  • Typical values for P 1 are in the range from 50 mm ⁇ m to 680 mm ⁇ m, preferably in the range from 100 mm ⁇ m to 500 mm ⁇ m, particularly preferably from 200 mm ⁇ m to 400 mm ⁇ m.
  • Typical values for P 2 are in the range from 8 to 20, preferably in the range from 9 to 18, particularly preferably from 10 to 15.
  • the anodes and / or cathodes are each made of two coupled electrically conductive components assembled.
  • the first component is designed as a relatively narrow strip but from high-current-carrying material, preferably from metal, e.g. Gold or silver.
  • the second component is compared to the first Component of wider stripes executed. For that he is targeted from one material essentially transparent for visible radiation, e.g. made of indium tin oxide (ITO). Because of the larger possible The width of the strip is despite a possibly lower electrical conductivity an overall sufficient current carrying capacity of the given second component. Both components are together in electrical contact. In this way it is also a sufficiently large one Electrode area - an important parameter for the dielectric disabled Unloading - realized.
  • ITO indium tin oxide
  • the two components are made of a dielectric galvanically isolated from each other.
  • the coupling between the two components takes place capacitively.
  • the second component is preferably closer to Arranged inside the discharge vessel as the first component. Moreover is only the first component as feedthrough and power supply continued to the outside.
  • the second component is used in this case only to increase the effective electrode area within the The discharge vessel.
  • At least the inner wall of the ceiling panel is made with a mixture of fluorescent materials coated, which during operation the UV / VUV radiation of the gas discharge converted to white light.
  • the inner wall of the discharge vessel is complete, i.e. Ceiling plate, frame and base plate coated with the phosphor mixture.
  • the outer power leads are on an outer edge of the floor and / or ceiling plate and / or the frame arranged. To do this is or if necessary, the floor or ceiling plate, at least on the Sides of the flat lamp, on which the bushings from inside the Guide the discharge vessel to the outside, extended beyond the frame.
  • each electrode strip is therefore considered as a structure similar to a conductor track, each of the three following, functionally different sub-areas includes: inner electrode area, feedthrough area and outer Stromzu operationsbreich.
  • connection of the power supply lines of the same polarity with the two Poles of a pulse voltage source are made using, for example suitable plug-cable combination.
  • the electrode strips of the same polarity can each be in a common Override bus-like external power supply. Can operate these two external power supplies directly with one pole of the voltage source get connected. In this case, you can use a special Stekker cable combination to be dispensed with.
  • the strip-like electrodes are next to one another arranged on the base plate (case I). This results in operation an essentially planar discharge structure.
  • the advantage is that Shadowing from the electrodes on the glowing ceiling panel be avoided.
  • the two anode strips of each anode pair are in Broadened direction towards their respective two narrow sides.
  • the widening becomes an increasing electrical current density and consequently also achieved an increasing luminance of the individual discharges.
  • the advantage is a relatively uniform luminance distribution up to the edges the flat lamp.
  • the anode strips are asymmetrical with respect to their longitudinal axis widened to the respective anodic partner strip. Through this The measure remains the respective distance to the neighboring cathode despite widening the anode strip is constant throughout. Consequently are in operation also the ignition conditions for all individual discharges along the electrode strips equal. This ensures that the individual discharges Form lined up along the entire length of the electrode (sufficient electrical input power provided).
  • the anode strips can also point towards the respective neighboring cathode be widened without the beneficial effects of widening in principle would be lost.
  • the broadening only relatively weakly trained. This prevents the Discharges only at the location of the greatest width of the anode strip, i.e. at the point of the shortest stroke distance in this case.
  • the broadening is significantly smaller than the stroke distance, typically around one Tenth of the stroke.
  • both types of widening can also be combined, i.e. the widening is then both towards the respective anode partner strips as well as the adjacent cathode.
  • the electrode structure for a bilaterally disabled discharge is preferred symmetrical because in this case the polarity of the electrodes replaced.
  • each electrode acts alternately as an anode or Cathode.
  • FIG. 1 shown schematically.
  • the entire conductor track-like structure 100 exists from a first part 101 and a second part 102.
  • Both parts 101, 102 have the double anode strips 103a and 103b or 104a and 104b, the double anode strips 103a, b of the first Part 101 and the double anode strips 104a, b of the second part 102 of the Structure are arranged alternately side by side.
  • Both parts 101,102 the electrode structure are covered with a dielectric layer (not shown) covered.
  • the cathode strips have a specific spatial unipolar voltage pulse preferred starting points for the individual discharges.
  • the anode-side structure 107 has those already mentioned several times Double anode strips 108a and 108b.
  • the bilateral conclusion of the structure 107 on the anode side forms a single anode strip 109 and 110.
  • the cathode strips 111 of the structure 112 on the cathode side the preferred starting points by nose-like, the neighboring Anode strips facing extensions 113 realized.
  • the anode strips 109a, b and cathode strips 111 open out alternately at theirs opposite ends in an anode 114 or cathode 115 bus-like external power supply.
  • anode and cathode strips are on different Panels arranged (case II).
  • the discharges burn during operation consequently from the electrodes of one plate through the discharge space through to the electrodes of the other plate.
  • Each are cathode strips two anode strips assigned such that in cross-section with respect of the electrodes considers the imaginary connection of cathode and corresponding anode strips give the shape of a "V". In this way it is achieved that the stroke distance is greater than the distance between the floor and ceiling slab.
  • this arrangement achieve higher UV yields than if anodes and Cathodes are alternately arranged side by side on only one plate. According to the current state of knowledge, this positive effect attributed to reduced wall losses.
  • the double anode strips are preferably on the ceiling panel primarily used to extract light and the cathode strips are arranged on the base plate.
  • the advantage is the low shadowing of the emitted by the ceiling plate Useful light because the anode strips are narrower than the cathode strips are.
  • Electrodes that are particularly useful for reducing the shadowing effect use At least the anode strips are advantageous for this purpose each consisting of a narrow, high-current carrying capacity and a wide one transparent components.
  • case II it is also advantageous for case II if the cathode strips as in case I have extensions.
  • the luminance is also a compression of these extensions and / or Widening of the anode strips to the edge of the flat lamp advantageous.
  • a light-reflecting layer for example Al 2 O 3 and / or TiO 2 , to the base plate. This prevents part of the white light which is emitted by the phosphor layer by converting the UV / VUV radiation from being transmitted through the base plate and being lost through the base plate for the direction of use.
  • an inert gas preferably, in the interior of the discharge vessel Xenon and possibly one or more buffer gases, e.g. Argon or neon.
  • the internal pressure is typically approx. 10 kPa to approx. 100 kPa.
  • Balls of an electrically insulating material e.g. Glass
  • This increases the mechanical stability and decreases the risk of implosion due to the pressure difference between inside and Outside. It is advisable to fix the balls with solder.
  • the lighting system according to the invention is powered by a pulse voltage source completed, whose output poles with the external power supplies the electrodes of the discharge vessel are connected and the delivers a sequence of voltage pulses during operation.
  • a suitable circuit arrangement to generate unipolar pulse voltage sequences is in the German patent application DE-A-195 48 003.
  • the lighting system can also be operated with unipolar and bipolar pulse voltages as they are e.g. from the circuit disclosed in WO96 / 05653 be generated.
  • Protection for a liquid crystal display device is also claimed, which the aforementioned lighting system as backlight used for the liquid crystal display.
  • the liquid crystal display device in turn uses this lighting system as backlight for the liquid crystal display.
  • the device contains a receptacle in which the liquid crystal display including control electronics for controlling the liquid crystal display and the lighting system are arranged.
  • the lighting system and the liquid crystal display are oriented to one another in such a way that the ceiling plate of the flat lamp of the lighting system illuminates the rear of the liquid crystal display.
  • An optical diffuser is optionally arranged between the flat lamp and the liquid crystal display. It is used to smooth out irregularities in the surface luminance of the flat lamp. This is particularly advantageous in the case of large-area displays in order to compensate for shadowing caused by the glass spheres which act as support points.
  • BEF B rightness E nhancement F ilm
  • BEF B rightness E nhancement F ilm
  • Figures 3a, 3b show a schematic representation of a top view or Side view of a flat fluorescent lamp operating white light emitted. It is used as a backlight for an LCD (Liquid Crystal Display).
  • LCD Liquid Crystal Display
  • the flat lamp 1 consists of a flat discharge vessel 2 with a rectangular base, four strip-like metallic cathodes 3, 4 (-) and dielectric anodes (+), three of which are designed as elongated double anodes 5 and two as individual strip-like anodes 6.
  • the discharge vessel 2 in turn consists of a base plate 7, a cover plate 8 and a frame 9. Base plate 7 and cover plate 8 are each connected gas-tight to the frame 9 by means of glass solder 10 such that the interior 11 of the discharge vessel 2 is cuboid.
  • the base plate 7 is larger than the cover plate 8 in such a way that the discharge vessel 2 has a circumferential free-standing edge.
  • the inner wall of the ceiling plate 8 is coated with a phosphor mixture (not visible in the illustration), which converts the UV / VUV radiation generated by the discharge into visible white light. It is a three-band phosphor with the blue component BAM (BaMgAl 10 O 17 : Eu 2+ ), the green component LAP (LaPO 4 : [Tb 3+ , Ce 3+ ]) and the red component YOB ([Y, Gd] BO 3 : Eu 3+ ).
  • BAM blue component
  • LAP LaPO 4 : [Tb 3+ , Ce 3+ ]
  • YOB [Y, Gd] BO 3 : Eu 3+
  • the breakthrough in the ceiling plate 8 is only for illustrative purposes and provides a view of a part of the cathodes 3, 4 and anodes 5, 6.
  • the cathodes 3.4 and anodes 5.6 are alternating and parallel on the Inner wall of the base plate 7 arranged.
  • the anodes 6.5 and cathodes 3,4 are each extended at one end and on the base plate 7 out of the interior 11 of the discharge vessel 2 on both sides to the outside such that the associated anodic 12 or cathodic bushings arranged on opposite sides of the base plate 7 are.
  • the electrode strips go on the edge of the base plate 7 3,4,5,6 each in the cathode-side 13 or anode-side 14 outer power supply about.
  • the outer power supply lines 13, 14 serve as contacts for connection to preferably an electrical pulse voltage source (not shown). The connection with the two poles of a voltage source usually takes place as follows.
  • the anodes 5, 6 are completely included a glass layer 15 covered, the thickness of which is approximately 250 microns.
  • the two anode strips 5a, 5b of each anode pair 5 are towards the two edges 16, 17 of the flat lamp 1, which are perpendicular to the electrode strips 3-6 oriented are widened and asymmetrically only towards the respective partner strip 5b or 5a.
  • the mutual greatest distance between the two strips of each anode pair 5 approx. 4 mm, the smallest distance is approx. 3 mm.
  • the two individual Anode strips 6 are each in the immediate vicinity of the two Electrode strips 3-6 arranged parallel edges 18, 19 of the flat lamp 1.
  • the cathode strips 3, 4 have nose-like anodes that are adjacent 5; 6 facing semicircular extensions 20. They work locally limited amplifications of the electric field and consequently that the delta-shaped Single discharges (not shown) exclusively on these Ignite and burn spots.
  • the distance between the extensions 20 and the respective immediately adjacent anode strips is approx. 6 mm.
  • the radius of the semicircular extensions 20 is approximately 2 mm.
  • the individual electrodes 3-6 including bushings and external power supplies 13, 14 are each more related as functionally different sections conductor-like structures made of silver.
  • the structures have a thickness of approx. 10 ⁇ m and are made using screen printing technology and then baked directly onto the base plate 7.
  • the execution corresponds qualitatively to the Representation in Figure 2 for the backlighting of a 15 "monitor there are 14 double anode strips and 15 cathodes alternately on the base plate a flat fluorescent lamp arranged.
  • the bilateral closure the electrode arrangement each form a single anode strip.
  • the Cathodes each have 32 semicircular along their two long sides projections arranged offset from one another.
  • the external dimensions the lamp are approx. 315 mm x 239 mm x 10 mm (Length Width Height).
  • the wall thickness of the floor and ceiling panels is approx.2.5 mm each.
  • the frame is made of a glass tube with a Diameter of approx. 5 mm.
  • anode-side power supply with the positive pole (+) and the cathode-side power supply with the negative pole (-) one Unipolar voltage pulse supplying voltage source connected.
  • FIG. 4 schematically shows part of a sectional view along the line AA (see FIG. 3a).
  • the same features have the same reference numbers Mistake.
  • the part shown includes the implementation 12 a double anode 5.
  • the structure of the remaining electrodes basically similar.
  • the two feed-through strips 12a, 12b are direct applied to the base plate 7 and also completely with the glass layer 15 covered.
  • the base plate 7 with the bushing 12 included Glass layer 15 are again gas-tight with frame 9 by means of glass solder 10 connected.
  • the ceiling plate 8 is gas-tight by means of glass solder 10 the frame 9 connected to the discharge vessel 2.
  • the cathodes 3, 4 and anodes are used to operate the flat lamp 1 5.6 via the power supply lines 13 and 14 to one pole 21, 22 each Pulse voltage source 23 connected.
  • the pulse voltage source delivers during operation, unipolar voltage pulses, which are separated by pauses are separated.
  • a suitable pulse voltage source is in the German patent application DE-A-19548003. This will form one Large number of individual discharges (not shown) between the Extensions 20 of the respective cathode 3, 4 and the corresponding immediately burn adjacent anode strips 5,6.
  • FIGS. 6a and 6b show a schematic representation of a side view or a partial section perpendicular to the electrodes of a further variant of the flat fluorescent lamp from FIG. 3a.
  • the cathodes 24 are applied to the inner wall of the ceiling plate 8.
  • Each cathode 24 is assigned an anode pair 25a, 25b in such a way that, in the cross section of FIG. 6b, the imaginary connection of cathodes 24 and corresponding anodes 25a, 25b results in the shape of an upside-down "V".
  • the approximate distances between the cathodes 24, between the individual anodes 25a, 25b of the corresponding anode pairs with one another and between the adjacent corresponding anode pairs are 22 mm, 18 mm and 4 mm, respectively.
  • the cathodes 24 each have nose-like semicircular extensions 26a, 26b along their two longitudinal sides and at a mutual spacing of approximately 10 mm. In operation, individual discharges start at these extensions 26a, 26b and burn to their associated anode strips 25a and 25b, respectively.
  • the part shown includes, by way of example, only two cathodes 24 with their associated anode pair 25a, 25b. The structure and basic arrangement of the remaining electrodes are the same.
  • Cathodes 24 and anodes 25a, 25b are led to the outside on the same narrow side of the fluorescent lamp and pass on the corresponding edge of the top plate 8 or bottom plate 7 into the cathode-side 27 or anode-side 14 outer power supply. As can be seen in the sectional illustration (FIG.
  • both the anodes 25a, 25b and the cathodes 24 are completely covered with a dielectric layer 28 or 29 (discharge which is dielectrically impeded on both sides) and which extends over the entire inner wall of the bottom 7 or cover plate 8 extends.
  • a light-reflecting layer 30 made of Al 2 O 3 or TiO 2 is applied to the dielectric layer 28 of the base plate 7.
  • the last layer is followed by a phosphor layer 31 or 32 made of a BAM, LAP, YOB mixture and also on the dielectric layer 29 of the ceiling plate 8.
  • FIG. 7 schematically shows a side view, partly in section, of one Liquid crystal display device 33 shown with the flat fluorescent lamp 1 corresponding to Figure 1a as a backlight for a known Liquid crystal display 35.
  • a lens 36 as an optical diffuser arranged between the flat fluorescent lamp 1 and the liquid crystal display 35.
  • two light amplification foils (BEF) 37, 38 from 3M are arranged between the lens 36 and the liquid crystal display 35.
  • the Flat fluorescent lamp 1, the lens 36, the two light reinforcement foils 37, 38 and the liquid crystal display 35 are arranged in a housing and supported by the frame 39 of the housing.
  • a heat sink 41 is arranged in the housing rear wall 40.
  • FIGS. 8a-8b The one shown schematically in FIGS. 8a-8b in top view and side view Flat lamp 1 'differs from flat lamp 1 (FIGS. 3a and 3b) only in the design of the external power supply 12; 13.
  • the Feedthroughs 10; 11 of each electrode strip 3; 4 are on the edge of the Base plate 5 initially continued and open into a cathode side 12 or 13 anode-side bus-like conductor track.
  • the ends (+, -) of this Conductor tracks 12; 13 serve as external contacts for connection to a electrical voltage source (not shown).
  • FIG. 9 shows a schematic partial sectional illustration of another Variant of the flat lamp. It differs from that shown in FIG. 6b essentially in that the anodes 25a and 25b of each anode pair 25 are made in two parts. They each consist of one narrow silver stripe 25 'and a wider transparent indium tin oxide stripe 25 ", with the silver stripe 25 'in the indium tin oxide stripe 25 "is embedded in this way Anodes reduced on the ceiling plate, i.e. their effective transparency increased for the useful light.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Claims (22)

  1. Tube fluorescent plat (1) d'éclairage de fond comportant
    une enceinte de décharge (2) en matériau diélectrique, qui est plat, fermé, et au moins partiellement transparent, qui est rempli d'une atmosphère gazeuse, et qui comporte sur la paroi intérieure au moins partiellement une couche d'une matière luminescente ou d'un mélange de matières luminescentes, et des électrodes (3 à 6) disposées sur la paroi intérieure de l'enceinte de décharge (2),au moins les anodes (5, 6) étant recouvertes respectivement d'une couche diélectrique (15), caractérisé en ce que
    l'enceinte de décharge (2) est constituée d'une plaque de fond (7), d'une plaque de couvercle (8) et d'un cadre (9), la plaque de fond (7), la plaque de couvercle (8) et le cadre (9) étant reliés entre eux au moyen d'une brasure (10) de façon étanche aux gaz,
    les électrodes (3 à 6) en bande se transforment en plus en des traversées (12) qui se transforment elles-mêmes en entrées de courant (13, 14) de sorte que les électrodes (3 à 6), les traversées (12) et les entrées de courant extérieures (13, 14) sont conformées en structures (3, 4, 13 ; 5, 6, 14) similaires à des pistes conductrices,
    les traversées étant amenées à l'extérieur de façon étanche aux gaz à travers la brasure (10) et les entrées de courant extérieures (13, 14), se raccordant directement aux traversées, servant au raccordement d'une source d'alimentation électrique.
  2. Tube fluorescent plat selon la revendication 1, caractérisé en ce que l'épaisseur des structures est comprise entre 5 µm et 50 µm, de préférence entre 5,5 µm et 30 µm, de façon particulièrement préférée entre 6 µm et 15 µm.
  3. Tube fluorescent plat selon la revendication 1 ou 2, caractérisé en ce que des éléments d'écartement sont placés entre la plaque de fond et la plaque de couvercle.
  4. Tube fluorescent plat selon la revendication 3, caractérisé en ce que les éléments d'écartement sont réalisés par des billes de verre.
  5. Source de rayonnement plate selon la revendication 3 ou 4, caractérisée en ce que le paramètre P1 = dSt * dEl est de l'ordre de 50 mm µm à 680 mm µm, de préférence de l'ordre de 100 mm µm à 500 mm µm, de façon particulièrement préférée de 200 mm µm à 400 mm µm, dSt étant l'écartement des éléments de soutien et leur distance par rapport à la paroi latérale limitatrice et dEl étant l'épaisseur des bandes d'électrode.
  6. Source de rayonnement plate selon l'une des revendications 3 à 5, caractérisée en ce que le paramètre P2 = dSt / dPl s est de l'ordre de 8 à 20, de préférence de l'ordre de 9 à 18, de façon particulièrement préférée de 10 à 15, dSt étant l'écartement des points de soutien et leur distance par rapport à la paroi latérale limitatrice et dPl est la plus petite des deux épaisseurs de la plaque de fond et de couvercle.
  7. Tube fluorescent plat selon l'une des revendications 1 à 6, caractérisé en ce que les cathodes (3, 4) de type bande comportent le long de leur longs côtés des saillies (20) en forme de téton.
  8. Tube fluorescent plat selon la revendication 7, caractérisé en ce que les saillies (20) sont disposées de façon à être spatialement de plus en plus dense en direction des deux petits côtés respectifs des cathodes (4) de type bande.
  9. Tube fluorescent plat selon l'une des revendications précédentes, caractérisé en ce que les électrodes (3 à 6) de type bande sont disposées les unes à côté des autres sur la paroi intérieure de la plaque de fond (7) de l'enceinte de décharge, deux bandes anodiques (5a, 5b), c'est-à-dire une paire d'anodes (5), étant disposées entre des bandes de cathodes voisines (3, 3 et 3, 4).
  10. Tube fluorescent plat selon la revendication 9, caractérisé en ce que les deux bandes anodiques (5a ; 5b) de chaque paire d'anodes (5) sont élargies en direction de leurs deux petits côtés respectifs.
  11. Tube fluorescent plat selon la revendication 10, caractérisé en ce que les élargissements sont conformés de façon dissymétrique par rapport à l'axe longitudinal respectif des bandes (5a ; 5b) et exclusivement en direction des bandes respectives associées (5b et 5a) de sorte que la distance respective entre des bandes anodiques (5a, 5b) et des bandes cathodiques voisines (3) et (4) est toujours constante.
  12. Tube fluorescent selon plat l'une ou plusieurs des revendications précédentes, caractérisé en ce que les cathodes (24) et les anodes (25) sont disposées sur des plaques différentes, avantageusement les anodes (25) sont disposées sur la plaque de couvercle (8) et les cathodes sont disposées sur la plaque de fond (7), deux anodes (25a, 25b) étant associées à chaque cathode (24) de sorte que la liaison imaginaire de la cathode (24) et des anodes correspondantes (25a, 25b) forme à chaque fois un « V », le cas échéant à l'envers, lorsque l'on observe les électrodes en coupe transversale.
  13. Tube fluorescent plat selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les anodes et/ou les cathodes sont chacune constituées de deux composants électroconducteurs (25', 25") couplés entre eux, le premier composant (25') étant conformé en bande étroite apte à porter du courant de grande intensité et le deuxième composant (25") étant conformé en bande sensiblement transparente vis-à-vis du rayonnement visible et plus large que le premier composant (25').
  14. Tube fluorescent plat selon la revendication 13, caractérisé en ce qu'un diélectrique se trouve entre le premier composant et le deuxième composant et en conséquence le couplage entre les deux composants est capacitif.
  15. Tube fluorescent plat selon la revendication 13 ou 14, caractérisé en ce que seul le premier composant est amené à l'extérieur en tant que traversée ainsi qu'entrée de courant et le deuxième composant sert simplement à augmenter la surface efficace des électrodes à l'intérieur de l'enceinte de décharge.
  16. Tube fluorescent plat selon l'une ou plusieurs des revendications précédentes, caractérisé en ce qu'une couche réfléchissante pour la lumière est déposée sur la paroi intérieure de la plaque de fond (7), le cadre (9) et les dispositifs d'écartement.
  17. Tube fluorescent plat selon l'une ou plusieurs des revendications précédentes, dans lequel les entrées de courant extérieures sont conformées de telle sorte que les traversées (12) des cathodes (3, 4) et des anodes (5, 6) débouchent sur une piste conductrice (13, 14) cathodique et anodique de type bus.
  18. Système d'éclairage comportant un tube fluorescent plat (1) et une source de tension électrique (23), reliée électriquement au tube fluorescent plat (1), qui est appropriée pour générer en fonctionnement dans le tube fluorescent plat (1) des impulsions de puissance active, séparées les unes des autres par des pauses, caractérisé en ce que le tube fluorescent plat (1) présente les caractéristiques de l'une ou de plusieurs des revendications 1 à 17.
  19. Dispositif d'affichage à cristaux liquides (33) comportant un afficheur à cristaux liquides (35), une électronique de commande (42) pour commander l'afficheur à cristaux liquides (35), un système d'éclairage pour l'éclairage de fond de l'afficheur à cristaux liquides (35) ainsi qu'un logement (39) dans lequel est placé l'afficheur à cristaux liquides (35) doté de l'électronique de commande (42) et du système d'éclairage, caractérisé par le système d'éclairage de la revendication 18.
  20. Dispositif d'affichage à cristaux liquides selon la revendication 19, caractérisé en ce que au moins un diffuseur optique (36) est placé entre le tube plat (1) et l'afficheur à cristaux liquides (35).
  21. Dispositif d'affichage à cristaux liquides selon la revendication 19 ou 20, caractérisé en ce que au moins un film d'amplification de lumière (37, 38) BEF (Brighness Enhancement Film) est disposé entre le tube plat (1) et l'afficheur à cristaux liquides (35).
  22. Dispositif d'affichage à cristaux liquides selon la revendication 19 à 21, caractérisé en ce que d'abord un premier diffuseur optique, puis un film d'amplification de lumière et enfin une deuxième diffuseur optique sont placés entre le tube plat et l'afficheur à cristaux liquides.
EP98925418A 1997-03-21 1998-03-20 Tube fluorescent plat destine a l'eclairage de fond et dispositif d'affichage a cristaux liquides dote de ce tube fluorescent plat Expired - Lifetime EP0912991B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19711890 1997-03-21
DE19711890 1997-03-21
DE19729181 1997-07-08
DE19729181 1997-07-08
PCT/DE1998/000827 WO1998043277A2 (fr) 1997-03-21 1998-03-20 Tube fluorescent plat destine a l'eclairage de fond et dispositif d'affichage a cristaux liquides dote de ce tube fluorescent plat

Publications (2)

Publication Number Publication Date
EP0912991A2 EP0912991A2 (fr) 1999-05-06
EP0912991B1 true EP0912991B1 (fr) 2004-03-03

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EP98925418A Expired - Lifetime EP0912991B1 (fr) 1997-03-21 1998-03-20 Tube fluorescent plat destine a l'eclairage de fond et dispositif d'affichage a cristaux liquides dote de ce tube fluorescent plat

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US (2) US6034470A (fr)
EP (1) EP0912991B1 (fr)
JP (1) JP3264938B2 (fr)
KR (1) KR100375615B1 (fr)
CN (1) CN1267967C (fr)
AT (1) ATE261188T1 (fr)
CA (1) CA2256346C (fr)
DE (1) DE59810890D1 (fr)
HU (1) HU224147B1 (fr)
TW (1) TW412770B (fr)
WO (1) WO1998043277A2 (fr)

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Publication number Publication date
ATE261188T1 (de) 2004-03-15
CA2256346A1 (fr) 1998-10-01
HU224147B1 (hu) 2005-05-30
HUP0000863A2 (hu) 2000-08-28
JP2000503801A (ja) 2000-03-28
WO1998043277A3 (fr) 1999-01-07
EP0912991A2 (fr) 1999-05-06
TW412770B (en) 2000-11-21
CN1267967C (zh) 2006-08-02
CN1220771A (zh) 1999-06-23
DE59810890D1 (de) 2004-04-08
KR20000015788A (ko) 2000-03-15
JP3264938B2 (ja) 2002-03-11
KR100375615B1 (ko) 2003-04-18
CA2256346C (fr) 2006-05-16
WO1998043277A2 (fr) 1998-10-01
US6034470A (en) 2000-03-07
US6853124B1 (en) 2005-02-08
HUP0000863A3 (en) 2003-01-28

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