EP0372234A1 - Fluorescent lamp - Google Patents
Fluorescent lamp Download PDFInfo
- Publication number
- EP0372234A1 EP0372234A1 EP89120512A EP89120512A EP0372234A1 EP 0372234 A1 EP0372234 A1 EP 0372234A1 EP 89120512 A EP89120512 A EP 89120512A EP 89120512 A EP89120512 A EP 89120512A EP 0372234 A1 EP0372234 A1 EP 0372234A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compartments
- rectangular
- filament electrode
- enclosure
- plural
- 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
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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
- H01J61/92—Lamps with more than one main discharge path
Definitions
- FIG.4 is a front view showing arrangement of an assembly of the fluorescent lamps shown in FIG.1 and FIG.2, wherein straight lines show outside faces of the outside walls 1′, 1′, of the rectangle enclosure 1, and double parallel vertical lines show vertical partition walls 5, 5 in the rectangle enclosure 1.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
- The present invention relates to a fluorescent lamp, and particularly to a fluorescent lamp for use in a large sized color image display apparatus.
- FIG.6 is a front view of a conventional special type fluorescent lamp for use in a light emitting device for a large sized color image display apparatus. The special type fluorescent lamp has a hexagonal-
shaped glass enclosure 20 comprising sixtriangular compartments filament cathode 19 common for all of the six triangular compartments disposed at the center part of the hexagonal enclosure, and sixanode electrodes - The purpose of the present invention is to provide a fluorescent lamp which is easy in arrangement on a color display panel, and has high brightness and uniformity of brightness.
- The fluorescent lamp in accordance with the present invention comprises:
a rectangular gas-tight enclosure having a transparent or translucent face panel on the front face, a filament electrode container provided at the central part on the rear wall in a manner to be connected to the inside space of the rectangular enclosure through connection holes at the central part on the rear wall, plural partitions which are provided in the rectangular enclosure to divide the inside space into plural rectangular compartments in a manner that each of the rectangular compartment is connected to the filament electrode container through the connection holes,
a common filament electrode provided in the filament electrode container with its axis substantially perpendicular to plane of the lengthwise partitions,
plural other electrodes provided in respective ones of the compartments at their far end regions from the through holes,
phosphor layers for emission of lights of plural different colors (R, G, B) provided on each of a first side pixel region which is formed by plural compartments (86a, 86b, 86c) on one side of said widthwise partition (5′) and a second side pixel region which is formed by plural compartments (87a, 87b, 87c) on the other side of said widthwise partition (5′), and
a discharge gas comprising at least a rare gas and Hg,
whereby
discharge paths are formed in respective rectangular compartments between the common filament electrode and respective ones of the other electrodes. - The fluorescent lamp in accordance with the present invention comprises a rectangular gas-tight enclosure having a transparent or translucent face panel on the front face and a filament electrode container provided at the central parts on the rear wall, and the filament electrode container contains a common filament electrode therein. The rectangular enclosure and the filament electrode container together constitute an integral gas-tight enclosure. In the rectangular enclosure, plural partitions are provided so as to divide the inside space of the rectangular enclosure into plural, such as six rectangle compartments, each of which is connected through respective connection holes to the space of the filament electrode container. The plural rectangle compartments form discharge spaces for lights of different colors. The filament electrode provided in the filament electrode container is disposed with its axis of coil in a direction perpendicular to the lengthwise (hence vertical in the embodiment) partition walls disposed in the enclosure. Each compartment has other electrode on the far end part from the connection hole. The inside walls of respective compartments have phosphor layer of different colors. Discharge gas comprising a rare gas, e.g. Ar, and Hg is confined in the enclosure. Therefore, gas discharge paths are constituted between the common filament electrode and the respective other electrodes at the far side of the compartments via respective connection holes. Thus, the rectangle enclosure coupled with the filament electrode container constitutes plural fluorescent lamps of different colors of light. Lightings or extinguishings of respective fluorescent lamps are controlled by potentials to be applied to the other electrodes, and brightnesses of lights are controlled by controlling currents or time periods (duty times) of the currents. The upper half portion of the rectangle enclosure having three compartments for three primary colors of light constitutes one pixel, and the lower half portion similarly constitutes the other one pixel. Therefore, the rectangle enclosure having six compartments constitutes two pixels.
- While the novel features of the invention are set forth particularly in the appended claims, the invention, both as to organization and content, will be better understood and appreciated, along with other objects and features thereof, from the following detailed description taken in conjunction with the drawings.
-
- FIG.1 is an exploded view of the fluorescent lamp embodying the present invention.
- FIG.2 is a front view of the fluorescent lamp of FIG.1.
- FIG.3 is a chromaticity diagram of light emitted by the fluorescent lamp of the embodiment (hatched region) and NTSC color reproduction range (in the chain line triangle region).
- FIG.4 is a drawing to show arrangement of the fluorescent lamp of FIG.1 through FIG.3 in a color image display apparatus.
- FIG.5 is a drawing to show arrangement of the fluorescent lamp of another example in a color image display apparatus.
- FIG.6 is a front view of the fluorescent lamp of the prior art.
- It will be recognized that some or all of the Figures are schematic representations for purposes of illustration and do not necessarily depict the actual relative sizes or locations of the elements shown.
- As shown in FIG.1, the fluorescent lamp of a preferred embodiment has a gas-
tight rectangle enclosure 1 made of rectangle ceramic box of 34 mm height x 17 mm width x 10 mm depth size made of ceramics wherein the front face is aglass sheet 2 bonded gas-tightly on the front part of theceramic enclosure 1 with low melting point glass.Rectangle enclosure 1 hasseveral partition walls enclosure 1 into six rectangle compartments. That is, two lengthwisely i. e. vertically disposedpartitions partition 5′ are provided like lattice thereby producing sixrectangle compartments ceramic rectangle enclosure 1 has six widthwiserectangle connection holes compartment filament electrode container 4 having afilament electrode 9 therein is mounted in acircular recess 3 formed on the rear face of the rear wall and bonded gas-tightly to the rear wall with low temperature glass. The widthwiselyrectangular connection holes filament electrode container 4 andrespective rectangle compartments filament 9 is about 10 mm long, has known emission oxide coating thereon, and is supported by a pair ofinside lead wires glass stem 11. A pair of outer lead wires, are is connected to theinside lead wires evacuation tube 12 is provided on thestem 11. Thefilament 9 serves as a common cathode for all the sixrectangle compartments lengthwise partitions rear wall 19 of the ceramic rectangle enclosure by 3-7mm.Respective compartments anode electrodes 14a,14b connection holes rear wall 19. - By the above-mentioned construction, six of fluorescent lamps are constituted in the six
compartments anodes common filament cathode 9 through the individual through-holes - On the inside faces of the
rear wall 19 of respective compartments, rare-earth phosphor layers for respective light colors are provided, for instance, green emitting phosphor layer in thecompartments compartments - As discharge gas, a rare gas, e. g. Ar of 10―15 Torr., especially of about 13 Torr. is confined together with necessary amount of Hg in the
rectangle enclosure 1. - In this way, the
compartments compartments outside walls 1′, 1′, of therectangle enclosure 1, and double parallel vertical lines showvertical partition walls rectangle enclosure 1. - The fluorescent lamp in accordance with the present invention has rectangle outside shape, wherein each compartment as discharge space is also rectangle. Therefore, the space factor of the discharge space per the area of the compartment is high. Furthermore, since the outside shape of the
rectangle enclosure 1 is rectangle, their arrangement on the large-sized display panel is very simple as shown in FIG.4. That is, they can only be disposed in vertical and horizontal rows. Since thecommon filament electrode 9 is disposed with its coil axis perpendicular to the plane of vertical partition walls, in other words, perpendicular to the discharge paths inrespective compartments rear wall 19, supply of thermal electrons to respective discharge space is uniform. Therefore, discharge maintain voltages for all discharge paths are uniform, and hence there is substantially no irregularity of brightness on the screen. Since therectangle enclosure 1 is made of ceramic box, it is easily produced in highly accurate size and shape. - In order to display a picture with the fluorescent lamp of the embodiment, first a voltage above a discharge start voltage is applied to from an auxiliary discharge current source across
respective anodes - When the brightness of the fluorescent lamp in accordance with the present invention is compared with the fluorescent lamp of the prior art shown in FIG.5, ratio of brightness to input electric power was improved to 1.3 times of the conventional fluorescent lamp shown in FIG.5. Furthermore, by arranging the fluorescent lamps in accordance with the present invention as shown in FIG.4, number of the fluorescent lamp per area can be increased to 1.3 times of the case using the conventional fluorescent lamp shown in FIG.5. Use of the ceramic box in place of conventional glass box as the rear part of the rectangle fluorescent lamp enclosure of this example improves reflectivity of emitted light, and improves the brightness in comparison with use of all glass fluorescent lamp enclosure. Furthermore, because of achievement of uniform discharge maintain voltage of the respective element discharge paths in each fluorescent lamp, substantially no brightness fluctuation or irregularity was observed.
- In a still other embodiment of FIG.5, the 3n ( n is 1, 2, 3 ...) (in this example 6) rectangular compartments are formed in widthwise direction thereby to provide 2n (in this example 6) pixels (i.e. n upper pixels and n lower pixels) in one rectangle fluorescent lamp having a widthwisely long filament electrode, as shown in FIG.6.
- Although the invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been changed in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.
Claims (6)
a rectangular gas-tight enclosure (1) having a transparent or translucent face panel (2) on the front face,
plural lengthwise partitions (5, 5,) and a widthwise partition (5′) which are provided in said rectangular enclosure (1) to divide said inside space into plural rectangular compartments (6a, 6b, 6c, 7a, 7b, 7c,),
a filament electrode container (4) provided at the central part on the rear wall (19) of said rectangular gas-tight enclosure (1) in a manner to be connected to the inside space of said rectangular enclosure (1) through plural connection holes (86a, 86b, 86c, 87a, 87b, 87c) formed in said plural rectangular compartments (6a, 6b, 6c, 7a, 7b, 7c) at the central part of said rear wall (19), respectively,
a common filament electrode (9) provided in said filament electrode container (4) with its axis substantially perpendicular to plane of said lengthwise partitions (5, 5),
plural other electrodes (14a, 14b, 14c, 15a, 15b, 15c) provided in respective ones of said compartments at their far end regions from said through holes (86a, 86b, 86c, 87a, 87b, 87c),
phosphor layers for emission of lights of plural different colors (R, G, B) provided on each of a first side pixel region which is formed by plural compartments (86a, 86b, 86c) on one side of said widthwise partition (5′) and a second side pixel region which is formed by plural compartments (87a, 87b, 87c) on the other side of said widthwise partition (5′), and
a discharge gas comprising at least a rare gas and Hg,
whereby
discharge paths are formed in respective rectangular compartments between said common filament electrode (9) and respective ones of said other electrodes.
said connection holes (86a, 86b, 86c, 87a, 87b, 87c) are made at a region where a recessed area (3) is formed on the rear face of said rear wall (19), and
said filament electrode container (4) is mounted in and fixed to said recess.
a rectangular gas-tight enclosure (1) having a transparent or translucent face panel (2) on the front face,
two lengthwise partitions (5, 5,) and a widthwise partition (5′) which are provided in said rectangular enclosure (1) to divide said inside space into six rectangular compartments (6a, 6b, 6c, 7a, 7b, 7c,),
a filament electrode container (4) provided at the central part on the rear wall (19) of said rectangular gas-tight enclosure (1) in a manner to be connected to the inside space of said rectangular enclosure (1) through six connection holes (86a, 86b, 86c, 87a, 87b, 87c) formed in said six rectangular compartments (6a, 6b, 6c, 7a, 7b, 7c) at the central part of said rear wall (19), respectively,
a common filament electrode (9) provided in said filament electrode container (4) with its axis substantially perpendicular to plane of said lengthwise partitions (5, 5),
six other electrodes (14a, 14b, 14c, 15a, 15b, 15c) provided in respective ones of said compartments at their far end regions from said through holes (86a, 86b, 86c, 87a, 87b, 87c),
phosphor layers for emission of lights of three different colors (R, G, B) provided on each of a first side pixel region which is formed by three compartments (86a, 86b, 86c) on one side of said widthwise partition (5′) and a second side pixel region which is formed by three compartments (87a, 87b, 87c) on the other side of said widthwise partition (5′), and
a discharge gas comprising at least a rare gas and Hg,
whereby
six discharge paths are formed in respective rectangular compartments between said common filament electrode (9) and respective ones of six other electrodes.
said connection holes (86a, 86b, 86c, 87a, 87b, 87c) are made on a recessed area on the rear face of said rear wall (19), and
said filament electrode container (4) is mounted in and fixed to said recess.
a rectangular gas-tight enclosure (1) having a transparent or translucent face panel (2) on the front face,
3n-1 ( n is 1, 2, 3 ...) lengthwise partitions and a widthwise partition which are provided in said rectangular enclosure (1) to divide said inside space into 3n ( n is 1, 2, 3, ...) rectangular compartments of upper row and lower row,
a filament electrode container (4) provided at the central part on the rear wall (19) of said rectangular gas-tight enclosure (1) in a manner to be connected to the inside space of said rectangular enclosure (1) through 3n ( n is 1, 2, 3 ...) connection holes formed in said plural rectangular compartments at the central part of said rear wall (19), respectively,
a common filament electrode (9) provided in said filament electrode container (4) with its axis substantially perpendicular to plane of said lengthwise partitions in a manner to substantially extend to face to all connection holes,
plural other electrodes provided in respective ones of said compartments at their far end regions from said through holes),
phosphor layers for emission of lights of three different colors (R, G, B) provided on each of a first-side pixel region(s) which is (are) formed by 3n compartments (86a, 86b, 86c) on one side of said widthwise partition (5′) and a second-side pixel region(s) which is (are) formed by 3n compartments (87a, 87b, 87c) on the other side of said widthwise partition (5′), and
a discharge gas comprising at least a rare gas and Hg,
whereby
discharge paths are formed in respective rectangular compartments between said common filament electrode and respective ones of other electrodes, to provide 2n pixels.
said connection holes are made on a recessed area on the rear face of said rear wall (19), and
said filament electrode container (4) is mounted in and fixed to said recess.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP282960/88 | 1988-11-09 | ||
JP63282960A JP2741877B2 (en) | 1988-11-09 | 1988-11-09 | Fluorescent lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0372234A1 true EP0372234A1 (en) | 1990-06-13 |
EP0372234B1 EP0372234B1 (en) | 1994-07-06 |
Family
ID=17659357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89120512A Expired - Lifetime EP0372234B1 (en) | 1988-11-09 | 1989-11-06 | Fluorescent lamp |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0372234B1 (en) |
JP (1) | JP2741877B2 (en) |
DE (1) | DE68916621T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0635861A1 (en) * | 1993-07-19 | 1995-01-25 | Matsushita Electronics Corporation | A luminescent panel for color video display and its driving system, and a color video display apparatus utilizing the same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3532578B2 (en) * | 1991-05-31 | 2004-05-31 | 三菱電機株式会社 | Discharge lamp and image display device using the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4623821A (en) * | 1983-12-07 | 1986-11-18 | Mitsubishi Denki Kabushiki Kaisha | Color image display device |
DE3736922A1 (en) * | 1986-10-31 | 1988-05-11 | Toshiba Kawasaki Kk | LIGHT BEAMS OF DIFFERENT COLORS DELIVERING FLUORESCENT LAMPS |
-
1988
- 1988-11-09 JP JP63282960A patent/JP2741877B2/en not_active Expired - Fee Related
-
1989
- 1989-11-06 EP EP89120512A patent/EP0372234B1/en not_active Expired - Lifetime
- 1989-11-06 DE DE1989616621 patent/DE68916621T2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4623821A (en) * | 1983-12-07 | 1986-11-18 | Mitsubishi Denki Kabushiki Kaisha | Color image display device |
DE3736922A1 (en) * | 1986-10-31 | 1988-05-11 | Toshiba Kawasaki Kk | LIGHT BEAMS OF DIFFERENT COLORS DELIVERING FLUORESCENT LAMPS |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0635861A1 (en) * | 1993-07-19 | 1995-01-25 | Matsushita Electronics Corporation | A luminescent panel for color video display and its driving system, and a color video display apparatus utilizing the same |
US5629716A (en) * | 1993-07-19 | 1997-05-13 | Matsushita Electronics Corporation | Luminescent panel for color video display and its driving system, and a color video display apparatus utilizing the same. |
CN1058582C (en) * | 1993-07-19 | 2000-11-15 | 松下电子工业株式会社 | A luminescent panel for color video display and its driving system and a color video display apparatus utilizing the same |
Also Published As
Publication number | Publication date |
---|---|
DE68916621T2 (en) | 1995-02-16 |
DE68916621D1 (en) | 1994-08-11 |
JPH02129847A (en) | 1990-05-17 |
EP0372234B1 (en) | 1994-07-06 |
JP2741877B2 (en) | 1998-04-22 |
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