EP0912991A2 - 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

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Publication number
EP0912991A2
EP0912991A2 EP98925418A EP98925418A EP0912991A2 EP 0912991 A2 EP0912991 A2 EP 0912991A2 EP 98925418 A EP98925418 A EP 98925418A EP 98925418 A EP98925418 A EP 98925418A EP 0912991 A2 EP0912991 A2 EP 0912991A2
Authority
EP
European Patent Office
Prior art keywords
fluorescent lamp
flat fluorescent
flat
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.)
Granted
Application number
EP98925418A
Other languages
German (de)
English (en)
Other versions
EP0912991B1 (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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0912991A2 publication Critical patent/EP0912991A2/fr
Application granted granted Critical
Publication of EP0912991B1 publication Critical patent/EP0912991B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 background lighting according to the preamble of claim 1.
  • the invention also relates to a lighting system according to the preamble of claim 18 with this flat fluorescent lamp.
  • the invention 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 primarily designed for the backlighting of liquid crystal displays, also known as LCDs (Liquid Crystal Displays).
  • these are flat lamps with strip-like electrodes, in which either the electrodes of one polarity or all electrodes, i.e. both polarities, are separated from the discharge by means of a dielectric layer (one-sided or two-sided dielectric barrier discharge).
  • dielectric electrodes Such electrodes are also referred to in the following as "dielectric electrodes”.
  • strip-like electrode also called “electrode strip” for short - here and in the following an elongated, in Compared to its length, a very thin and narrow structure can be understood which is able to act as an electrode.
  • the edges of this structure need not necessarily be parallel to one another.
  • substructures should also be included along the long sides of the strips.
  • the dielectric layer can be formed by the wall of the discharge vessel itself, in that the electrodes are arranged outside the discharge vessel, for example on the outer wall.
  • An advantage of this design with external electrodes is that no gas-tight leadthrough has to be passed through the wall of the discharge vessel.
  • the thickness of the dielectric layer - an important parameter that influences, among other things, the ignition and the operating voltage of the discharge - is essentially determined by the requirements placed on the discharge vessel, in particular its mechanical strength.
  • the dielectric layer can also be implemented in the form of an at least partial covering or layer of at least the anodic part of the electrodes arranged within the discharge vessel.
  • This has the advantage that the thickness of the dielectric layer can be optimized for the discharge properties.
  • internal electrodes require gas-tight leadthroughs. As a result, additional manufacturing steps are required, which generally makes the manufacturing more expensive.
  • Liquid crystal display devices have recently been used in particular in portable computers (laptops, notebooks, palmtop or the like), but also for stationary computer monitors. Further areas of application are information displays in control rooms of industrial plants or flight monitoring devices, displays of cash register systems and automatic cash dispensing systems and television sets, to name just a few. Liquid crystal display devices are also increasingly being used in automotive Mobile technology used for so-called driver information systems. Liquid crystal display devices require a backlight which illuminates the entire liquid crystal display as brightly and evenly as possible.
  • WO 94/23442 discloses a method for operating an incoherently emitting radiation source, in particular a discharge lamp, by means of dielectrically impeded discharge.
  • the operating method provides a sequence of active power pulses, the individual active power pulses being separated from one another by dead times.
  • a plurality of similar discharges similar to delta-like ( ⁇ ), burn in the plan view, that is perpendicular to the plane in which the electrodes are arranged, between adjacent electrodes of different polarity.
  • These individual discharges are lined up along the electrodes, each widening in the direction of the (current) anode.
  • alternating polarity of the voltage pulses of a bilaterally dielectric discharge a superimposition of two delta-shaped structures appears visually.
  • discharge structures are preferably generated with repetition frequencies in the kHz range, the viewer perceives only a "medium" discharge structure corresponding to the temporal resolution of the human eye, for example in the form of an hourglass.
  • the number of individual discharge structures can be influenced, inter alia, by the electrical power that is coupled in.
  • Another advantage of this pulsed mode of operation is the high efficiency of the radiation generation.
  • This mode of operation is also suitable for flat lamps of the type described at the outset, as has already been demonstrated in WO 94/04625.
  • a flat radiator is known from WO 94/04625, which is operated in accordance with the operating method of WO 94/23442. Due to the very efficient mode of operation, the flat radiator produces relatively little heat loss.
  • strip-shaped electrodes are arranged on the outer wall of the discharge vessel with the disadvantages described at the outset.
  • Another disadvantage of this solution is that the surface luminance drops significantly towards the edge. The reason for this is, among other things, the radiation contribution from the neighboring areas outside of the discharge vessel which is missing at the edge.
  • the individual discharges preferably form between the anodes and only one of the two immediately adjacent cathodes. Hence, individual discharges do not form simultaneously on both sides of the anode strips. Rather, it cannot be predicted from which of the two adjacent cathodes the discharges will form in each case. In relation to the flat radiator as a whole, this results in an irregular discharge structure and, consequently, in a temporally and spatially non-uniform surface luminance.
  • a uniform surface luminance is desirable for numerous applications of such spotlights.
  • backlighting LCDs requires visual uniformity, the modulation depth of which does not exceed 15%.
  • EP 0 363 832 discloses, among other things, a UV high-power radiator with strip-shaped electrodes which are arranged on the inner wall of the base plate of the discharge vessel. However, no information is provided on current feedthroughs for connecting the inner electrodes to a voltage source.
  • the UV high-performance lamp is operated with sinusoidal AC voltage. As is known, the achievable UV yields in AC operation are limited to less than approximately 15%. However, higher yields are required for efficient backlighting of LCD systems.
  • an exemplary embodiment with cooling channels integrated in the base plate is also given, which is impractical for many applications, in particular in the office area and in mobile use.
  • a liquid crystal display with a surface lighting device is known from EP 0 607453.
  • the area lighting device essentially consists of a plate-shaped light guide and at least one curved rod-shaped fluorescent lamp.
  • the fluorescent lamp is arranged according to the bend on two or more abutting edges of the light guide plate.
  • the light from a fluorescent lamp is already coupled into the light guide plate at the at least two edges and is scattered by the plate surface facing the liquid crystal display.
  • This measure is intended to achieve good illumination without a correspondingly large number of lamps being required.
  • the disadvantage of this solution is that an optical fiber plate cannot be dispensed with.
  • external reflectors are additionally provided along the lamps, which laterally reflect part of the lamp light into the light guide plate.
  • Another aspect is the simple design of the electrode structures in terms of production technology, which enables low-cost implementation of flat fluorescent lamps with increased and uniform surface luminance.
  • Another object of the present invention is to provide a lighting system according to the preamble of claim 18. This Object is solved by the characterizing features of claim 18.
  • the basic idea of the first part of the invention is to design the inner electrodes, including bushings and outer current leads, as three functionally different sections, each of a single, interconnected, conductor-like structure on the cathode or anode side.
  • the two structures also offer the advantage of almost any formability.
  • the shapes of the electrodes which are optimized to a uniform surface luminance up to the edges, can be implemented in a technically simple and cost-effective manner. For this, for example, only a structured pressure screen has to be designed accordingly.
  • Another advantage of the invention is that the constructive concept enables the cost-effective production of flat fluorescent lamps of almost any size, since all production steps can always be carried out in the same way practically regardless of the size of the spotlight. It can be used to economically implement transmit flat lamps for the backlighting of different sized liquid crystal displays. Further advantages are the high luminance and the high luminous efficacy, a typical specific luminous intensity is approx. 8 cd / W for a lamp including optical diffuser.
  • the discharge vessel is constructed from a base plate and a cover plate, which are separated by a frame and by means of solder, e.g. Glass solder, are connected to each other to form a closed discharge vessel.
  • solder e.g. Glass solder
  • One end of the electrode strips is guided gas-tight to the outside through the solder.
  • the seal between the bushing and frame as well as between the frame and the floor or ceiling plate takes over.
  • the materials for solder and frame as well as the floor and ceiling slab are coordinated.
  • the thicknesses of the preferably metallic electrode strips are chosen to be so thin that on the one hand the thermal stresses remain low and on the other hand the current intensities required during operation can be achieved.
  • a sufficiently high current carrying capacity of the conductor tracks is of particular importance insofar as the high luminous intensities sought for such flat lamps ultimately require high current intensities.
  • a particularly high light intensity is essential because of the low transmission of such displays of typically 6%. This problem is exacerbated again in the preferred pulsed operating mode of the discharge, since particularly high currents flow in the conductor tracks during the relatively short duration of the repetitive active power coupling. Only in this way is it possible to couple in sufficiently high average active powers and thereby achieve the desired high light intensity on average.
  • 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.
  • Support points for example in the form of glass spheres, which are arranged at a suitable distance from one another between the floor and ceiling panels, may also contribute to this, which give the flat radiator sufficient bending stability without causing unacceptably strong shading.
  • the two parameters d st - d E1 and P 2 d St / d P1 as relevant for life Duration of the flat radiator viewed, where d st the distance between the support points to each other or to the delimiting side wall, d E1 the thickness of the electrode tracks and d P1 the smaller of the two thicknesses of the floor or ceiling plate.
  • Typical values for P 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 composed of two electrically conductive components coupled to one another.
  • the first component is designed as a relatively narrow strip, but it is made of a material capable of withstanding high currents, preferably of metal, for example gold or silver.
  • the second component is designed as a wider strip than the first component. For that he is targeted from one material essentially transparent for visible radiation, for example made of indium tin oxide (ITO). Because of the larger width of the strip that is possible as a result, despite the possibly lower electrical conductivity, the overall current carrying capacity of the second component is also sufficient. Both components are in electrical contact with each other. In this way, a sufficiently large electrode area - an important parameter for the dielectric barrier discharge - is also realized.
  • ITO indium tin oxide
  • the two components are galvanically separated from one another by a dielectric.
  • the coupling between the two components is capacitive.
  • the second component is preferably arranged closer to the inside of the discharge vessel than the first component.
  • only the first component is continued as a feedthrough and power supply to the outside. In this case, the second component merely serves to enlarge the effective electrode area within the discharge vessel.
  • At least the inner wall of the ceiling panel is coated with a mixture of phosphors, which converts the UV / VUV radiation from the gas discharge into white light during operation.
  • a mixture of phosphors which converts the UV / VUV radiation from the gas discharge into white light during operation.
  • 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 supply lines are arranged on an outer edge of the floor and / or ceiling plate and / or the frame.
  • the base plate or the ceiling plate is or are extended beyond the frame, at least on the sides of the flat lamp on which the bushings lead from the inside of the discharge vessel to the outside.
  • the electrode strips end after the lead-through area in a number of external current leads corresponding to the number of electrode strips.
  • each electrode strip is thus designed as a structure similar to a conductor track, which in each case comprises the three following, functionally different partial areas: inner electrode area, lead-through area and outer current supply area.
  • connection of the power supply lines of the same polarity to the two poles of a pulse voltage source takes place, for example, with the aid of a suitable plug-cable combination.
  • the electrode strips of the same polarity can merge into a common, bus-like external power supply.
  • these two external power supplies can be connected directly to one pole of the voltage source. In this case, there is no need for a special plug-cable combination.
  • the strip-like electrodes are arranged next to one another on the base plate (case I). This results in an essentially flat discharge structure during operation.
  • the advantage is that shadowing from the electrodes on the illuminated ceiling panel is avoided.
  • Between the cathode strips are two parallel anode strips, i.e. an anode pair, instead of a single anode strip previously arranged. This solves the problem described at the outset that, in the cited prior art, individual discharges burn from only one of two adjacent cathode strips in the direction of the individual anode strip lying between them.
  • the two anode strips of each anode pair are widened in the direction of their respective two narrow sides.
  • an increasing electrical current density and consequently also an increasing luminance of the individual discharges is achieved.
  • the advantage is a relatively uniform luminance distribution up to the edges of the flat lamp.
  • the anode strips are widened asymmetrically with respect to their longitudinal axis in the direction of the respective anodic partner strip.
  • the respective distance from the adjacent cathode remains constant despite the widening of the anode strips. Consequently, the ignition conditions for all individual discharges along the electrode strips are the same during operation. This ensures that the individual discharges are lined up along the entire length of the electrode (provided there is sufficient electrical input power).
  • the anode strips can also be widened in the direction of the respective adjacent cathode without the advantageous effect of the widening being lost in principle.
  • the broadening is only relatively weak. This prevents the discharges from occurring only at the location of the greatest width of the anode strip, i.e. at the location of the shortest stroke distance in this case.
  • the broadening is significantly smaller than the stroke distance, typically about a tenth of the stroke distance.
  • both types of distribution can also be combined, i.e. the widening is then both in the direction of the respective anode partner and also to the adjacent cathode.
  • the electrode structure for a bilaterally disabled discharge is preferably of symmetrical design, since in this case the polarity of the electrodes changes. As a result, each electrode acts alternately as an anode or cathode.
  • the basic relationships of the structure are shown schematically in FIG. 1.
  • the entire conductor track-like structure 100 consists of 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 already described, 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 being arranged alternately next to one another.
  • Both parts 101, 102 of the electrode structure are covered with a dielectric layer (not shown).
  • a dielectric layer not shown.
  • the double anode strips 103a, b; or 104a, b into bus-like external power supply lines 105; 106 a.
  • the two outer power supply lines 105; 106 each connected to one pole of the voltage source (not shown).
  • the cathode strips specifically have spatially preferred starting points for the individual discharges.
  • the electrode structure for a flat lamp with a diagonal of 6.8 is shown schematically in FIG. 2.
  • the anode-side structure 107 has the double anode strips 108a and 108b already mentioned several times.
  • the anode-side structure 107 is terminated on both sides a single anode strip 109 and 110.
  • the preferred starting points are realized by nose-like extensions 113 facing the respectively adjacent anode strip.
  • the anode 109a, b and cathode strips 111 open at their mutually opposite ends into an anode-side 114 and cathode-side 115 bus-like external power supply.
  • the anode-side power supply 114 is connected to the positive pole (+) and the cathode-side power supply 115 to the negative pole (-) of a voltage source (not shown) supplying unipolar voltage pulses.
  • the feature of widening the double anode strips can also be combined with the feature of the compression of the cathode processes.
  • anode and cathode strips are arranged on different plates (case II).
  • the discharges consequently burn from the electrodes of one plate through the discharge space to the electrodes of the other plate.
  • Two anode strips are assigned to each cathode strip in such a way that, when viewed in cross-section with respect to the electrodes, the imaginary connection of cathode strips and corresponding anode strips results in the shape of a “V” It has been shown that this arrangement can achieve higher UV yields than if anodes and cathodes are arranged alternately next to one another on the basis of the current state of knowledge, this positive effect is attributed to reduced wall losses the double anode strips are arranged on the ceiling plate, which primarily serves to decouple light, and the cathode strips are arranged on the base plate.
  • the advantage is the low shadowing of the ceiling plate Useful light, since the anode strips are narrower than the cathode strips.
  • the two-part electrodes explained above can be used with particular advantage to reduce the shading effect.
  • at least the anode strips are advantageously each composed of a narrow, high-current-carrying and a wide transparent component.
  • a light-reflecting layer for example Al 2 O a and / or Ti0 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 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 made of an electrically insulating material for example glass
  • This increases the mechanical stability and reduces the risk of implosion due to the pressure difference between inside and outside. It is advisable to fix the balls with solder. It is also advantageous to provide the support points with a reflection and a light to provide a layer of fabric to maximize the luminance of the flat lamp.
  • Protection is also claimed for a lighting system which consists of the aforementioned new flat lamp and a pulse voltage source.
  • the lighting system according to the invention is completed by a pulse voltage source, the output poles of which are connected to the external power supply lines of the electrodes of the discharge vessel and which supplies a sequence of voltage pulses during operation.
  • a pulse voltage source the output poles of which are connected to the external power supply lines of the electrodes of the discharge vessel and which supplies a sequence of voltage pulses during operation.
  • a suitable circuit arrangement for generating unipolar pulse voltage sequences is described in German patent application P 195 48 003.1.
  • the lighting system can also be operated with unipolar and bipolar pulse voltages, e.g. are generated by the circuit disclosed in WO96 / 05653.
  • the liquid crystal display device in turn uses this lighting system as backlighting 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 serves to smooth the 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.
  • so-called light reinforcement films also known as BEF (Brightness Enhancement Film) are optionally arranged between the flat lamp and the liquid crystal display or, if appropriate, between the diffuser and the liquid crystal display. They serve to concentrate the light from the backlight in a narrower solid angle and consequently to increase the brightness within the viewing angle range.
  • BEF Brightness Enhancement Film
  • the mercury-free filling of the flat lamp enables an immediate start without start-up behavior. This makes it possible to switch off the flat lamp even when the display device is not used for a short time, for example during a work break, and consequently to save electrical energy. It is also advantageous that the proposed liquid crystal display device manages without external reflectors and light guiding devices, which reduces the number of components and consequently the system costs.
  • FIG. 1 shows the principle of an electrode structure according to the invention for a bilaterally disabled discharge
  • FIG. 2 shows the basic relationships of the electrode structure for a flat lamp with a diagonal of 6.8 ", preferably to be operated with unipolar voltage pulses
  • FIG. 3a shows a schematic representation of a partially broken top view of a flat lamp according to the invention with electrodes arranged on the base plate,
  • Figure 3b is a schematic representation of a side view of the flat lamp from Figure 3a.
  • FIG. 4 shows the sectional view of the implementation of a double anode
  • FIG. 5 a flat lamp with a pulse voltage source
  • FIG. 6a shows a schematic illustration of a side view of a flat lamp with electrodes arranged on both the base plate and the cover plate
  • FIG. 6b shows a partial sectional view of some bushings of the flat lamp from FIG. 6a
  • Figure 7 shows a liquid crystal display device according to the invention including a flat lamp.
  • FIG. 8a shows a schematic representation of a partially broken top view of a further flat lamp according to the invention with electrodes arranged on the base plate
  • FIG. 8b shows a schematic illustration of a side view of the flat lamp from FIG. 8a
  • Figure 9 is a partial sectional view of a flat lamp with two-part anodes.
  • FIGS. 3a, 3b show a schematic representation of a top view and side view of a flat fluorescent lamp that emits white light during operation emitted. It is designed 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 area, 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 gas-tightly connected 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 peripheral free-standing edge.
  • the inner wall of the ceiling panel 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 ⁇ oOi7- Eu 2+ ), the green component LAP (LaPO ⁇ [Tb 3+ , Ce 3+ ]) and the red component YOB ([Y, Gd] B ⁇ 3: Eu 3+ ).
  • BAM blue component
  • LAP LaPO ⁇ [Tb 3+ , Ce 3+ ]
  • YOB [Y, Gd] B ⁇ 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 arranged alternately and in parallel on the inner wall of the base plate 7.
  • the anodes 6, 5 and cathodes 3, 4 are each extended at one end and guided on the bottom plate 7 from the inside 11 of the discharge vessel 2 on both sides in such a way that the associated anodic 12 or cathodic bushings on opposite sides the bottom plate 7 are arranged.
  • the outer power supply lines 13, 14 serve as contacts for connection to preferably an electrical pulse voltage source (not shown). The connection to the two poles of a voltage source usually takes place as follows.
  • the individual anodic and cathodic power supply lines are each connected to one another, for example by means of a suitable plug connector (not shown) including connecting lines.
  • the two common anodic or cathodic connecting lines are connected to the associated two poles of the voltage source.
  • the anodes 5, 6 are completely covered with a glass layer 15, the thickness of which is approximately 250 ⁇ m.
  • the two anode strips 5a, 5b of each anode pair 5 are widened in the direction of the two edges 16, 17 of the flat lamp 1, which are oriented perpendicular to the electrode strips 3-6, and asymmetrically only in the direction of the respective partner strips 5b and 5a .
  • the mutual greatest distance between the two strips of each anode pair 5 is approximately 4 mm, the smallest distance is approximately 3 mm.
  • the two individual anode strips 6 are each arranged in the immediate vicinity of the two edges 18, 19 of the flat lamp 1 which are parallel to the electrode strips 3-6.
  • the cathode strips 3; 4 have nose-like semicircular projections 20 facing the respectively adjacent anode 5; 6. They cause locally limited amplifications of the electric field and consequently that the delta-shaped individual discharges (not shown) ignite and burn only at these points.
  • the distance between the extensions 20 and the respective directly adjacent anode strip is approximately 6 mm.
  • the radius of the semicircular extensions 20 is approximately 2 mm.
  • the individual electrodes 3-6 including feedthroughs and external power supply lines 13, 14, are each designed as functionally different sections of interconnected silver-like structures.
  • the structures have a thickness of approx. 10 ⁇ m and are applied directly to the base plate 7 by means of screen printing technology and subsequent baking.
  • a 15 "monitor, 14 ' double anode strips and 15 cathodes are alternately arranged on the base plate of a flat fluorescent lamp.
  • the two ends of the electrode arrangement form one each
  • the cathodes have 32 semicircular projections offset from one another along their two long sides.
  • the outer dimensions of the lamp are approximately 315 mm • 239 mm • 10 mm (length • width • height).
  • the frame is made of a glass tube with a diameter of approximately 5 mm. 48 precision glass balls with a diameter of 5 mm are arranged equidistantly between the base and ceiling plate.
  • the anode and cathode strips open at their mutually opposite ends in an anod bus-side external power supply on the side or cathode side (cf. also Figure 2).
  • FIG. 4 schematically shows part of a sectional view along the line AA (see FIG. 3a).
  • the same features are provided with the same reference numbers.
  • the part shown includes, for example, the feedthrough 12 of a double anode 5.
  • the two lead-through strips 12a, 12b are applied directly to the base plate 7 and are also completely covered with the glass layer 15.
  • the base plate 7 with the feedthrough 12 including the glass layer 15 are in turn connected gas-tight to the frame 9 by means of glass solder 10.
  • the ceiling plate 8 is connected gas-tight to the frame 9 to the discharge vessel 2 by means of glass solder 10.
  • the cathodes 3, 4 and anodes 5, 6 in FIG. 5 are each connected to a pole 21, 22 of a pulse voltage source 23 via the current leads 13 and 14, respectively.
  • the pulse voltage source supplies unipolar voltage pulses, which are separated from one another by pauses.
  • a suitable pulse voltage source for this is described in German patent application P19548003.1.
  • a large number of individual discharges (not shown) are formed, which burn between the extensions 20 of the respective cathode 3, 4 and the corresponding immediately adjacent anode strip 5, 6.
  • FIGS. 6a and 6b schematically show 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 is in the form of an upside-down “V” results.
  • 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 comprises, by way of example, only two cathodes 24 with their respective 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 and 29 (discharge that is dielectrically impeded on both sides), which extends over the entire inner wall of the bottom 7 or cover plate 8 extends.
  • a light-reflecting layer 30 made of A1 2 0 3 or TiO 2 is applied to the dielectric layer 28 of the base plate 7.
  • the last layer is followed by and also on the dielectric layer 29 of the ceiling plate 8, a phosphor layer 31 or 32 made of a BAM, LAP, YOB mixture.
  • FIG 7 a side view, partially in section, of a liquid crystal display device 33 is shown schematically, with the flat fluorescent lamp 1 corresponding to Figure la as background lighting for a liquid crystal display 35 known per se.
  • a diffuser 36 as 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 fluorescent lamp 1, the diffusing screen 36, the two light intensifying foils 37, 38 and the liquid crystal display 35 are arranged in a housing and are held by the frame 39 of the housing.
  • a heat sink 41 is arranged on the outside of the rear wall 40 of the housing.
  • the circuit arrangement 23 connected to the flat fluorescent lamp 34 corresponding to FIG. 5 and a control electronics 42 known per se and connected to the liquid crystal display 35 are arranged.
  • a suitable liquid crystal display 35 with control electronics 42 reference is made to EP 0 607453.
  • the flat lamp 1 ′ shown schematically in plan view and side view in FIGS. 8a-8b 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 initially continued on the edge of the base plate 5 and open into a bus-like conductor track on the cathode-side 12 or anode-side 13.
  • the ends (+, -) of these conductor tracks 12; 13 serve as external contacts for the connection to an electrical voltage source (not shown).
  • FIG. 9 shows a schematic partial sectional illustration of a further 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 a narrow silver strip 25 'and a wider transparent indium tin oxide strip 25 ", the silver strip 25' being embedded in the indium tin oxide strip 25". In this way, shading is reduced by the anodes on the ceiling plate, ie their effective transparency for the useful light is increased.
  • the invention is not restricted by the exemplary embodiments specified. Features of different exemplary embodiments can also be combined.

Landscapes

  • 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)

Abstract

L'invention concerne un tube fluorescent (1) plat possédant un contenant (2) à décharge comprenant une plaque de base (7), un couvercle (8) et un cadre (9) qui sont assemblés de façon étanche au gaz par une soudure (10). Les structures de type conducteurs imprimés fonctionnent comme des électrodes (3-6) à l'intérieur du contenant à décharge, comme des passages dans la zone de passage et comme des amenées extérieures de courant (13; 14) à l'extérieur. Cela permet de fabriquer des tubes fluorescents plats de différentes tailles selon une technique de fabrication simple et facilement automatisable. En outre, quasiment toutes les formes d'électrodes sont réalisables et notamment optimisées en termes d'uniformité de la luminance avec une baisse de luminance réduite sur les bords du tube fluorescent plat. Au moins les anodes (5, 6) sont respectivement recouvertes d'une couche diélectrique (15). Le tube fluorescent (1) fonctionne, de préférence, avec une source de tension par impulsions et sert d'éclairage de fond pour des écrans à cristaux liquides, p.ex. dans des moniteurs ou afficheurs d'informations routières.
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 true EP0912991A2 (fr) 1999-05-06
EP0912991B1 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

Country Status (11)

Country Link
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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Also Published As

Publication number Publication date
US6853124B1 (en) 2005-02-08
JP2000503801A (ja) 2000-03-28
US6034470A (en) 2000-03-07
KR100375615B1 (ko) 2003-04-18
CN1267967C (zh) 2006-08-02
DE59810890D1 (de) 2004-04-08
KR20000015788A (ko) 2000-03-15
CN1220771A (zh) 1999-06-23
ATE261188T1 (de) 2004-03-15
CA2256346A1 (fr) 1998-10-01
WO1998043277A3 (fr) 1999-01-07
HUP0000863A3 (en) 2003-01-28
HU224147B1 (hu) 2005-05-30
HUP0000863A2 (hu) 2000-08-28
CA2256346C (fr) 2006-05-16
EP0912991B1 (fr) 2004-03-03
JP3264938B2 (ja) 2002-03-11
WO1998043277A2 (fr) 1998-10-01
TW412770B (en) 2000-11-21

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