EP0992060A1 - Fluorescent lamp with luminescent material layer thickness adapted to the geometrical discharge distribution - Google Patents
Fluorescent lamp with luminescent material layer thickness adapted to the geometrical discharge distributionInfo
- Publication number
- EP0992060A1 EP0992060A1 EP99945733A EP99945733A EP0992060A1 EP 0992060 A1 EP0992060 A1 EP 0992060A1 EP 99945733 A EP99945733 A EP 99945733A EP 99945733 A EP99945733 A EP 99945733A EP 0992060 A1 EP0992060 A1 EP 0992060A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluorescent lamp
- lamp according
- layer thickness
- layer
- electrode structure
- 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
Links
- 238000009826 distribution Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 title abstract description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 38
- 239000005338 frosted glass Substances 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 5
- 238000007639 printing Methods 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 238000007650 screen-printing Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims 1
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 4
- 230000007704 transition Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/38—Devices for influencing the colour or wavelength of the light
- H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
-
- 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
-
- 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
Definitions
- the present invention relates to a fluorescent lamp for dielectrically impeded discharges.
- a fluorescent lamp for dielectrically impeded discharges.
- Such a fluorescent lamp has a discharge vessel with a gas filling and a fluorescent layer.
- An electrode structure is designed for a dielectric barrier discharge, i. H. at least some of the electrodes are separated from the gas filling by a dielectric. The details of the construction of the lamp are only dealt with here to the extent necessary to understand the invention.
- the first of the cited applications shows an electrode structure which is particularly shaped by lug-like extensions of the cathodes and which defines a geometric distribution of partial discharges during lamp operation.
- This invention is based on the technical problem of developing a fluorescent lamp of the type described above in such a way that the light emission properties are optimized.
- a fluorescent lamp with a discharge vessel filled with a gas filling with a fluorescent layer and with an electrode structure for a dielectric barrier discharge, in which the electrode structure defines a geometric distribution of partial discharges during operation of the lamp, characterized in that the Phosphor layer has a varying layer thickness matched to the geometric distribution.
- the invention is based on the consideration that the uniformity of the luminance of a light exit surface is essential for essential applications of fluorescent lamps with dielectrically impeded discharges.
- Such flat radiators can be used in particular for backlighting display devices, especially liquid crystal screens.
- fluctuations in luminance of, for example, 15% are already critical.
- the uniformity of the luminance can also play a role in other technical fields, and this invention is not restricted to the field of flat radiators or the backlighting of display devices.
- luminance reductions in the areas between partial discharges should in any case be compensated for by more than 20% compared to the maxima, preferably already from limits of 15%, 10% or 5%.
- the intermediate discharge area mean reductions in the layer thickness of the phosphor layer to 30% - 95%, preferably 50% - 90% of the maximum layer thickness provided immediately above the discharges.
- the basic idea of the invention is to further exploit this determination of the partial discharges to the extent that Not to deposit the fluorescent layer of the fluorescent lamp in a planar and homogeneous manner as is conventional, but to implement it in a layer thickness variation which is matched to the given geometric distribution of the partial discharges.
- the terms used to vary the layer thickness or reduce the layer thickness also mean to form local recesses in the phosphor layer, that is to say to reduce the layer thickness to zero.
- the invention is not limited to a specific form of an electrode structure which defines the arrangement of the partial discharges, in particular not to the already mentioned cathode projections.
- thickness variations are one example Electrode dielectric possible.
- bipolar operation of a dielectric discharge for example, all electrodes are covered with a dielectric layer because the anode and cathode roles of individual electrodes are interchanged.
- unipolar case at least the anodes are covered with a fresh dielectric layer. To reduce sputter damage to the cathodes, however, these are often also covered with a - possibly thinner - dielectric layer.
- the thickness of the respective dielectric layers in their local area distribution plays a role in the arrangement of the individual partial discharges.
- the high-frequency resistance for the high-frequency Fourier components of individual active power pulses decreases and thus the electric field effectively present in the gas filling increases. Accordingly, the partial discharges tend to arrange local thinnings of dielectric layers on the electrodes.
- the electrode width can also be varied.
- the partial discharges tend to be arranged at locally widened locations on the electrodes. This is probably due to the fact that a larger locally available electrode area in turn causes a lower high-frequency resistance and a larger area distribution of the shielding counter-charges built up on the dielectric surface.
- the layer thickness variation of the phosphor layer according to the invention it can be preferred to produce an approximately continuous transition between regions of maximum and minimum layer thickness.
- a graded layer thickness variation in the transition area can be used for this. This has particular advantages with regard to the production process, in which printing processes are generally used to deposit the phosphor layer.
- two or more partial layers with geometrical structures which differ from one another in detail can be used here. - 6 -
- the thinnest areas of the phosphor layer in the projection in the direction of the main light exit direction centrally between the individual partial discharges and the areas of greatest layer thickness directly above the respective partial discharges.
- the minimum and the maximum layer thickness and the corresponding areas for fine structures that are no longer optically separable outside the lamp can result in a suitable local averaging.
- the layer thickness variations shown to compensate for luminance modulation by partial discharges in the fluorescent lamp can also be combined with appropriate measures for spacers and
- FIG. 1 shows a schematic sectional view with an electrode structure of a fluorescent lamp according to the invention, burning partial discharges in between and an adapted structured fluorescent layer;
- Oil discharges 3 are thus distributed substantially over the entire area in the flat radiator discharge vessel.
- the electrodes 2 are initially not shown there in order not to disturb the recognizability of the geometric relationship between the cutouts 5 and the partial discharges 3.
- the difference from the structure shown in Figure 1 is that the not shown nose-like projections 4 of the cathodes are each (in the sense of the figure) at the same height, so that the overall pattern of the partial discharges is aligned in a different way.
- the resulting relatively large intermediate areas between the partial discharges 3 are provided with diamond-shaped cutouts 5.
- the findings relating to FIG. 1 apply to further improvements.
- FIG. 3 in turn relates to the electrode structure 2 shown in FIG. 1, which is not repeated here for the reasons mentioned.
- a different pattern of cutouts 5 in the phosphor layer 1 is selected here, which detects the spaces between the partial discharges 3 in a somewhat more differentiated manner.
- the free strips mentioned in FIG. 1 are filled in by line-like recesses, while the recess triangles recognizable in FIG. 1 are extended here and, as it were, brought together to form a sawtooth line.
- This structure has a further improvement in the luminance homogeneity compared to FIG. 1, but still shows abrupt transitions between the recesses 5 and the otherwise continuous phosphor layer 1.
- FIG. 5 goes in the same direction, with the stripe pattern prevailing in FIG. 4 being replaced by an arrangement of fluorescent circles varying in diameter (on the left-hand side of the figure) surrounded by recess areas 5.
- the partial discharge triangles 3 are no longer shown, but are located in the continuous areas of the phosphor layer 1.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19817477 | 1998-04-20 | ||
DE19817477A DE19817477A1 (en) | 1998-04-20 | 1998-04-20 | Fluorescent lamp |
PCT/DE1999/001094 WO1999054915A1 (en) | 1998-04-20 | 1999-04-09 | Fluorescent lamp with luminescent material layer thickness adapted to the geometrical discharge distribution |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0992060A1 true EP0992060A1 (en) | 2000-04-12 |
EP0992060B1 EP0992060B1 (en) | 2002-02-06 |
Family
ID=7865126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99945733A Expired - Lifetime EP0992060B1 (en) | 1998-04-20 | 1999-04-09 | Fluorescent lamp with luminescent material layer thickness adapted to the geometrical discharge distribution |
Country Status (8)
Country | Link |
---|---|
US (1) | US6340862B1 (en) |
EP (1) | EP0992060B1 (en) |
JP (1) | JP3388546B2 (en) |
KR (1) | KR100356284B1 (en) |
CA (1) | CA2294315A1 (en) |
DE (2) | DE19817477A1 (en) |
TW (1) | TW434640B (en) |
WO (1) | WO1999054915A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10063931A1 (en) * | 2000-12-20 | 2002-07-04 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Image display device from a large number of silent gas discharge lamps |
DE10063930C1 (en) * | 2000-12-20 | 2002-08-01 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Silent discharge lamp with controllable color and image display device with this silent discharge lamp and method for operating the same |
DE10140355A1 (en) * | 2001-08-17 | 2003-02-27 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Discharge lamp with ignition aid |
DE10147961A1 (en) * | 2001-09-28 | 2003-04-10 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Igniting, operating dielectric barrier discharge lamp involves applying ignition voltage between sub-electrodes to ignite auxiliary discharge at gap between sub-electrodes during ignition |
CN101238548B (en) * | 2005-01-07 | 2012-05-02 | 皇家飞利浦电子股份有限公司 | Segmented dielectric barrier discharge lamp |
US20070188095A1 (en) * | 2006-02-15 | 2007-08-16 | Chu-Chi Ting | Planar light source |
DE102006026348A1 (en) * | 2006-06-02 | 2007-12-06 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Discharge lamp for unipolar dielectrically impeded discharges |
KR101142242B1 (en) * | 2007-04-27 | 2012-05-07 | 오스람 아게 | Dielectric barrier discharge lamp configured as a double tube |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4924356A (en) * | 1988-12-07 | 1990-05-08 | General Electric Company | Illumination system for a display device |
JP2538667B2 (en) * | 1989-04-13 | 1996-09-25 | 富士通株式会社 | Backlight |
EP0479490A3 (en) * | 1990-10-02 | 1992-08-12 | Physical Optics Corporation | Volume holographic diffuser |
DE4311197A1 (en) | 1993-04-05 | 1994-10-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Method for operating an incoherently radiating light source |
JPH0868997A (en) * | 1994-08-30 | 1996-03-12 | Hitachi Ltd | Liquid crystal display device |
US5720545A (en) * | 1995-02-28 | 1998-02-24 | Rockwell International | Refracting optic for fluorescent lamps used in backlighting liquid crystal displays |
DE19526211A1 (en) * | 1995-07-18 | 1997-01-23 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Process for operating discharge lamps or emitters |
DE19636965B4 (en) * | 1996-09-11 | 2004-07-01 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Electrical radiation source and radiation system with this radiation source |
JPH10255721A (en) * | 1997-03-07 | 1998-09-25 | Stanley Electric Co Ltd | Irradiation direction specified type fluorescent lamp |
CN1267967C (en) * | 1997-03-21 | 2006-08-02 | 电灯专利信托有限公司 | Flat fluorescent light for background lighting and liquid crystal display device fitted with said flat fluorescent light |
-
1998
- 1998-04-20 DE DE19817477A patent/DE19817477A1/en not_active Withdrawn
-
1999
- 1999-04-09 EP EP99945733A patent/EP0992060B1/en not_active Expired - Lifetime
- 1999-04-09 WO PCT/DE1999/001094 patent/WO1999054915A1/en active IP Right Grant
- 1999-04-09 JP JP55230299A patent/JP3388546B2/en not_active Expired - Fee Related
- 1999-04-09 US US09/446,013 patent/US6340862B1/en not_active Expired - Lifetime
- 1999-04-09 DE DE59900820T patent/DE59900820D1/en not_active Expired - Fee Related
- 1999-04-09 CA CA002294315A patent/CA2294315A1/en not_active Abandoned
- 1999-04-09 KR KR1019997012637A patent/KR100356284B1/en not_active IP Right Cessation
- 1999-04-14 TW TW088105937A patent/TW434640B/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9954915A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP3388546B2 (en) | 2003-03-24 |
CA2294315A1 (en) | 1999-10-28 |
DE19817477A1 (en) | 1999-10-21 |
JP2000513498A (en) | 2000-10-10 |
KR20010020614A (en) | 2001-03-15 |
TW434640B (en) | 2001-05-16 |
KR100356284B1 (en) | 2002-10-12 |
DE59900820D1 (en) | 2002-03-21 |
EP0992060B1 (en) | 2002-02-06 |
WO1999054915A1 (en) | 1999-10-28 |
US6340862B1 (en) | 2002-01-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0912990B1 (en) | Gas discharge lamp with dielectrically impeded electrodes | |
EP1847859B1 (en) | Method for the production of an illumination device and illumination device | |
EP0839436B1 (en) | Method for operating a lighting system and suitable lighting system therefor | |
DE69921085T2 (en) | Plasma display panel | |
EP1232518B1 (en) | Discharge lamp for dielectrically impeded discharges comprising supporting elements between a bottom plate and a cover plate | |
EP1074038B1 (en) | Flat reflector lamp for dielectrically inhibited discharges with spacers | |
EP1212781B1 (en) | Discharge lamp for dielectrically impeded discharges with an arrangement of supporting elements | |
EP0992060A1 (en) | Fluorescent lamp with luminescent material layer thickness adapted to the geometrical discharge distribution | |
EP0912992B1 (en) | Flat light emitter | |
DE19711892A1 (en) | Flat radiator | |
DE19927791A1 (en) | Color display e.g. LCD has spatially controllable brightness filter and back lighting discharge lamp having dielectrically impeded electrode | |
DE19817476A1 (en) | Fluorescent lamp with spacers and locally thinned fluorescent layer thickness | |
EP1490892B1 (en) | Discharge lamp for dielectrically impeded discharges having a corrugated cover plate structure | |
WO2000065635A1 (en) | Dielectrically impeded discharge lamp with a spacer | |
DE102008056160B4 (en) | Fluorescent lamp having external electrodes divided into respective main and sub-electrodes, and liquid crystal display having such a fluorescent lamp | |
WO2007141184A2 (en) | Discharge lamp for dielectrically impeded discharge using a flat discharge vessel | |
DE102006014880A1 (en) | electrode structure | |
DE19844921A1 (en) | Flat lighting device has optical system that influences spatial light distribution of light to be coupled into plate to have at least one maximum in defined angular range wrt. optical axis | |
DE102005046481A1 (en) | Fluorescent lamp for e.g. large-scale displays has internal cross pieces connected to base plate and cover plate | |
EP1034397A1 (en) | Flat lighting device | |
DE2331278A1 (en) | PLASMA DISCHARGE DISPLAY BOARD |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19991206 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT NL |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 20010713 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB IT NL |
|
REF | Corresponds to: |
Ref document number: 59900820 Country of ref document: DE Date of ref document: 20020321 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20020411 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20021107 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20030410 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20030428 Year of fee payment: 5 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040430 |
|
BERE | Be: lapsed |
Owner name: *PATENT-TREUHAND-G.- FUR ELEKTRISCHE GLUHLAMPEN M. Effective date: 20040430 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20041101 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20041101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050409 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20060411 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20060425 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20060619 Year of fee payment: 8 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20070409 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071101 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070409 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070430 |