EP0581232A1 - Electroluminescent device - Google Patents
Electroluminescent device Download PDFInfo
- Publication number
- EP0581232A1 EP0581232A1 EP93111947A EP93111947A EP0581232A1 EP 0581232 A1 EP0581232 A1 EP 0581232A1 EP 93111947 A EP93111947 A EP 93111947A EP 93111947 A EP93111947 A EP 93111947A EP 0581232 A1 EP0581232 A1 EP 0581232A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- luminescence
- emitting surface
- converter filter
- transparent resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
- H05B33/145—Arrangements of the electroluminescent material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
Definitions
- the present invention relates to an electroluminescent device and more particularly to an electroluminescent device in which a light-emitting surface side includes a chromatic light converter filter to produce a light of a desired color.
- FIG.3 Shows a first prior-art electroluminescent (EL) panel 90 without chromatic light converter filter.
- the EL panel 90 comprises a back electrode 91, a transparent electrode 92 disposed in parallel to the back electrode 91, a luminescent layer 93 sandwiched therebetween.
- the luminescent layer 93 is made of phosphor 93a and an organic fluorescent pigment 93b mixed with the phosphor 93a.
- FIG.4 shows a second prior-art EL panel 80 for eliminating the above-described drawbacks in the EL panel 90.
- the EL panel 80 comprises a back electrode 81, a transparent electrode 82 disposed in parallel to the back electrode 81, a luminescent layer 83 made of only phosphor 83a, and a chromatic light converter filter 84 attached to the light-emitting surface of the EL panel 80.
- the chromatic light converter filter 84 comprises a film 84a of a transparent resin, e.g., polyethylene terephthalate, a film 84b of an organic fluorescent pigment applied by printing or the like to the inner surface of the transparent film 84a, an ultraviolet cut film 84c attached to the outer surface of the transparent film 84a.
- the second prior-art EL panel 80 increases the luminous efficacy and life of the organic fluorescent pigment 84b.
- the ultraviolet cut film 84c secures at most only a 200-day (about 7-month) service life of the EL panel 80 in an outdoor exposure test. This means the EL panel 80 commercially cannot be used outdoors.
- An object of the present invention is to provide an EL device which increases life of an organic fluorescent pigment to increase service life of the EL device.
- a first aspect of the present invention is an electroluminescent device having a light-emitting surface, comprising a layer of phosphor capable of producing a luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence.
- the chromatic light converter filter is provided on a light-emitting surface side of the electroluminescent device and comprises a film made of a transparent resin and of the organic fluorescent pigment mixed with the transparent resin.
- a second aspect of the present invention is an electroluminescent panel, comprising a panel-shaped casing having a transparent flat portion the exterior surface of which constitutes a light-emitting surface of the electroluminescent panel, a layer of phosphor housed in said casing, the layer of phosphor being capable of producing luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence.
- the chromatic light converter filter is attached to the light-emitting surface and comprises a film made of a transparent resin and of the organic fluorescent pigment mixed with the transparent resin.
- the transparent resin seals particles of the organic fluorescent pigment from outside air to protect the organic fluorescent pigment from deterioration due to ultraviolet radiation to increase life or durability of the organic fluorescent pigment.
- the inventive EL device commercially can be used outdoors.
- An EL panel 1 according to an embodiment of the present invention comprises a back electrode 2, a transparent electrode 3 disposed in parallel to the back electrode 2, a luminescent layer 4 sandwiched therebetween and made of only phosphor 4a, and a chromatic converter filter 5 attached to the light-emitting surface of the EL panel 1 for converting luminescence from the luminescent layer 4 to white light.
- the chromatic converter filter 5 comprises a film or lamination in which an organic fluorescent pigment 5b of a relatively high transparency is blended with or uniformly scattered in a matrix 5a of a transparent resin, e.g., acrylic resin.
- a transparent resin e.g., acrylic resin.
- the EL panel 1 further comprises an insulating layer 6 and a moistureproof casing film 7.
- the insulating layer 6 is sandwiched between the luminescent layer 4 and the back electrode 2 to prevent a short circuit between the back electrode 2 and the transparent electrode 3.
- the casing film 7 protects the fluorescent layer 4 from a deterioration due to moisture. Both of the insulating film 6 and the casing film 7 are produced in a conventional manner. Since the organic fluorescent pigment 5b is blended with the transparent resin 5a, the transparent resin 5a seals particles of the organic fluorescent pigment 5b from outside air to increase life or durability of the organic fluorescent pigment 5b.
- FIG.2 is a graph indicative of a result of sunlight exposure test of the EL panel 1.
- FIG.2 further shows results of sunlight exposure test of the prior-art EL panels of FIGS.3 and 4 for comparison.
- the solid line F represents the result of sunlight exposure test of the inventive EL panel.
- the dotted line S represents the result of sunlight exposure test of the Prior-art EL panel of FIG.3.
- the dashed line M represents the result of sunlight exposure test of the prior-art EL panel of FIG.4.
- the X-values of chromaticity coordinates Y xy of emitted lights from all of the inventive EL panel and the prior-art EL panels of FIGS.3 and 4 are measured. The fading of the emitted lights from all of them wee confirmed.
- Y-axis represents x-values of chromaticity coordinate Y xy .
- X-axis represents test days.
- the x-value of chromaticity coordinates Y xy of the prior-art EL panel of FIG.4 is lowered under the bottom value 200 days and a fraction after start of the test.
- the x-value of chromaticity coordinates Y xy of the inventive EL panel maintains a level at which the emitted light is recognizable as white light, even 500 days after start of the test.
- the organic fluorescent pigment 5b of the chromatic light converter filter 5 converts phosphorescence of the phosphor 4a into white light.
- the present invention is also applicable to a conversion of the phosphorescence into color visible light other than white light.
Abstract
An electroluminescent device having a light-emitting surface, comprising a layer (4) of phosphor (4a) capable of producing a luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter (5) converting the luminescence into a light of a color different from the color of the luminescence. The chromatic light converter filter is provided on a light-emitting surface side of the electroluminescent device. The chromatic light converter filter is a film made of a transparent resin and the organic fluorescent pigment mixed with the transparent resin. The electroluminescent device commercially can be used outdoors.
Description
- The present invention relates to an electroluminescent device and more particularly to an electroluminescent device in which a light-emitting surface side includes a chromatic light converter filter to produce a light of a desired color.
- FIG.3 Shows a first prior-art electroluminescent (EL)
panel 90 without chromatic light converter filter. In order to emit white light, theEL panel 90 comprises aback electrode 91, atransparent electrode 92 disposed in parallel to theback electrode 91, aluminescent layer 93 sandwiched therebetween. Theluminescent layer 93 is made ofphosphor 93a and an organicfluorescent pigment 93b mixed with thephosphor 93a. - Mixing the organic
fluorescent pigment 93b with thephosphor 93a first reduces packing ratio of thephosphor 93a in theluminescent layer 93 to reduce luminous efficacy of theluminescent layer 93 and second significantly deteriorates the organicfluorescent pigment 93b to significantly shorten service life of theEL panel 90. - FIG.4 shows a second prior-
art EL panel 80 for eliminating the above-described drawbacks in theEL panel 90. TheEL panel 80 comprises aback electrode 81, atransparent electrode 82 disposed in parallel to theback electrode 81, aluminescent layer 83 made of onlyphosphor 83a, and a chromaticlight converter filter 84 attached to the light-emitting surface of theEL panel 80. The chromaticlight converter filter 84 comprises afilm 84a of a transparent resin, e.g., polyethylene terephthalate, afilm 84b of an organic fluorescent pigment applied by printing or the like to the inner surface of thetransparent film 84a, anultraviolet cut film 84c attached to the outer surface of thetransparent film 84a. - The second prior-
art EL panel 80 increases the luminous efficacy and life of the organicfluorescent pigment 84b. On the other hand, theultraviolet cut film 84c secures at most only a 200-day (about 7-month) service life of theEL panel 80 in an outdoor exposure test. This means theEL panel 80 commercially cannot be used outdoors. - An object of the present invention is to provide an EL device which increases life of an organic fluorescent pigment to increase service life of the EL device.
- A first aspect of the present invention is an electroluminescent device having a light-emitting surface, comprising a layer of phosphor capable of producing a luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence. The chromatic light converter filter is provided on a light-emitting surface side of the electroluminescent device and comprises a film made of a transparent resin and of the organic fluorescent pigment mixed with the transparent resin.
- A second aspect of the present invention is an electroluminescent panel, comprising a panel-shaped casing having a transparent flat portion the exterior surface of which constitutes a light-emitting surface of the electroluminescent panel, a layer of phosphor housed in said casing, the layer of phosphor being capable of producing luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence. The chromatic light converter filter is attached to the light-emitting surface and comprises a film made of a transparent resin and of the organic fluorescent pigment mixed with the transparent resin.
- Since the organic fluorescent pigment is mixed with the transparent resin, the transparent resin seals particles of the organic fluorescent pigment from outside air to protect the organic fluorescent pigment from deterioration due to ultraviolet radiation to increase life or durability of the organic fluorescent pigment. Thus the inventive EL device commercially can be used outdoors.
- Other objects, features and advantages of the present invention will be apparent from a consideration of the following description, taken in connection with the accompanying drawing.
-
- FIG.1 is a cross section of an EL panel according to an embodiment of the present invention;
- FIG.2 is a graph indicative of a result of sunlight exposure test of the EL panel of FIG.1 and those of prior-art EL panels;
- FIG.3 is a cross section of a first prior-art EL panel according to an embodiment of the present invention; and
- FIG.4 is a cross section of an EL panel according to an embodiment of the present invention.
-
- A preferred embodiment of the present invention will be described with reference to the drawings hereinafter.
- An
EL panel 1 according to an embodiment of the present invention comprises a back electrode 2, atransparent electrode 3 disposed in parallel to the back electrode 2, a luminescent layer 4 sandwiched therebetween and made of onlyphosphor 4a, and a chromatic converter filter 5 attached to the light-emitting surface of theEL panel 1 for converting luminescence from the luminescent layer 4 to white light. - The chromatic converter filter 5 comprises a film or lamination in which an organic
fluorescent pigment 5b of a relatively high transparency is blended with or uniformly scattered in amatrix 5a of a transparent resin, e.g., acrylic resin. Thus the chromatic converter filter 5 has substantially the same structure as a film of a colored transparent resin. - The
EL panel 1 further comprises an insulating layer 6 and amoistureproof casing film 7. The insulating layer 6 is sandwiched between the luminescent layer 4 and the back electrode 2 to prevent a short circuit between the back electrode 2 and thetransparent electrode 3. Thecasing film 7 protects the fluorescent layer 4 from a deterioration due to moisture. Both of the insulating film 6 and thecasing film 7 are produced in a conventional manner. Since the organicfluorescent pigment 5b is blended with thetransparent resin 5a, thetransparent resin 5a seals particles of the organicfluorescent pigment 5b from outside air to increase life or durability of the organicfluorescent pigment 5b. - FIG.2 is a graph indicative of a result of sunlight exposure test of the
EL panel 1. FIG.2 further shows results of sunlight exposure test of the prior-art EL panels of FIGS.3 and 4 for comparison. The solid line F represents the result of sunlight exposure test of the inventive EL panel. The dotted line S represents the result of sunlight exposure test of the Prior-art EL panel of FIG.3. The dashed line M represents the result of sunlight exposure test of the prior-art EL panel of FIG.4. The X-values of chromaticity coordinates Yxy of emitted lights from all of the inventive EL panel and the prior-art EL panels of FIGS.3 and 4 are measured. The fading of the emitted lights from all of them wee confirmed. Y-axis represents x-values of chromaticity coordinate Yxy. X-axis represents test days. As shown in the line M, the x-value of chromaticity coordinates Yxy of the prior-art EL panel of FIG.3 is lowered under the bottom value (=0.28) of whiteness about 30 days after start of the test. As shown in the line S, the x-value of chromaticity coordinates Yxy of the prior-art EL panel of FIG.4 is lowered under the bottom value 200 days and a fraction after start of the test. As shown in the line F, the x-value of chromaticity coordinates Yxy of the inventive EL panel maintains a level at which the emitted light is recognizable as white light, even 500 days after start of the test. - In the embodiment described above, the organic
fluorescent pigment 5b of the chromatic light converter filter 5 converts phosphorescence of thephosphor 4a into white light. However, the present invention is also applicable to a conversion of the phosphorescence into color visible light other than white light. - The present invention is not rigidly restricted to the embodiment described above. It is to be understood that a person skilled in the art can easily change and modify the present invention without departing from the scope of the invention defined in the appended claims.
Claims (6)
- An electroluminescent device having a light-emitting surface, comprising:
a layer of phosphor capable of producing a luminescence and directing the luminescence to the light-emitting surface when said layer of phosphor is excited by a voltage; and
a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence, said chromatic light converter filter being provided on a light-emitting surface side of the electroluminescent device, said chromatic light converter filter comprising a film made of a transparent resin and of an organic fluorescent pigment mixed with the transparent resin. - The electroluminescent device having a light-emitting surface as recited in claim 1, wherein said chromatic light converter filter converts the luminescence into white light.
- The electroluminescent panel as recited in claim 1, wherein said film is produced in the steps of blending powder of the organic fluorescent pigment with powder of the transparent resin and transforming the resulting mixture into said film.
- An electroluminescent panel, comprising:
a panel-shaped casing having a transparent flat portion the exterior surface of which constitutes a light-emitting surface of the electroluminescent panel;
a layer of phosphor housed in said casing, said layer of phosphor being capable of producing luminescence and directing the luminescence to the light-emitting surface when said layer of phosphor is excited by a voltage; and
a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence, said chromatic light converter filter being attached to the light-emitting surface, said chromatic light converter filter comprising a film made of a transparent resin and of an organic fluorescent pigment mixed with the transparent resin. - The electroluminescent panel as recited in claim 4, wherein said chromatic light converter filter converts the luminescence into white light.
- The electroluminescent panel as recited in claim 4, wherein said film is produced in the steps of blending powder of the organic fluorescent pigment with powder of the transparent resin and transforming the resulting mixture into said film.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP058415U JPH0623195U (en) | 1992-07-29 | 1992-07-29 | EL light emitting element |
JP58415/92U | 1992-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0581232A1 true EP0581232A1 (en) | 1994-02-02 |
Family
ID=13083752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93111947A Withdrawn EP0581232A1 (en) | 1992-07-29 | 1993-07-26 | Electroluminescent device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0581232A1 (en) |
JP (1) | JPH0623195U (en) |
KR (1) | KR100228515B1 (en) |
CN (1) | CN1084690A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0691798A3 (en) * | 1994-07-05 | 1996-07-17 | Ford Motor Co | Fluorescent electroluminescent lamp |
US5813752A (en) * | 1997-05-27 | 1998-09-29 | Philips Electronics North America Corporation | UV/blue LED-phosphor device with short wave pass, long wave pass band pass and peroit filters |
US5813753A (en) * | 1997-05-27 | 1998-09-29 | Philips Electronics North America Corporation | UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light |
GB2349978A (en) * | 1998-07-06 | 2000-11-15 | Huang Fu Kuo | A light emitting device |
GB2406900A (en) * | 2003-09-25 | 2005-04-13 | Koito Mfg Co Ltd | Vehicle indicator lamp with LED and filter |
EP2267801A1 (en) * | 1996-06-26 | 2010-12-29 | OSRAM Opto Semiconductors GmbH | Light-emitting semiconductor chip and light-emitting semiconductor component |
US8071996B2 (en) | 1996-09-20 | 2011-12-06 | Osram Gmbh | Wavelength-converting casting composition and light-emitting semiconductor component |
US10488709B2 (en) | 2014-06-25 | 2019-11-26 | Samsung Display Co., Ltd. | Fluorescent sheet and light unit and liquid crystal display including the same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101336022A (en) * | 2002-02-12 | 2008-12-31 | 出光兴产株式会社 | Organic EL display device and method for manufacturing the same |
DE102004031071B4 (en) | 2004-06-22 | 2008-04-30 | Samsung SDI Co., Ltd., Suwon | Method for treating an organic light-emitting diode (OLED) for extending the service life |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0323217A1 (en) * | 1987-12-31 | 1989-07-05 | Loctite Luminescent Systems, Inc. | Infra-red emitting electro-luminescent lamp structures |
EP0387715A2 (en) * | 1989-03-15 | 1990-09-19 | Idemitsu Kosan Company Limited | Electroluminescent element |
JPH0314540A (en) * | 1988-06-20 | 1991-01-23 | Mitsubishi Kasei Corp | El element |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2079261C (en) * | 1991-11-25 | 1999-04-13 | Delmar R. Riffe | Co-rotational scroll compressor supercharger device |
-
1992
- 1992-07-29 JP JP058415U patent/JPH0623195U/en active Pending
-
1993
- 1993-07-26 EP EP93111947A patent/EP0581232A1/en not_active Withdrawn
- 1993-07-27 KR KR1019930014351A patent/KR100228515B1/en not_active IP Right Cessation
- 1993-07-29 CN CN93109130A patent/CN1084690A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0323217A1 (en) * | 1987-12-31 | 1989-07-05 | Loctite Luminescent Systems, Inc. | Infra-red emitting electro-luminescent lamp structures |
JPH0314540A (en) * | 1988-06-20 | 1991-01-23 | Mitsubishi Kasei Corp | El element |
EP0387715A2 (en) * | 1989-03-15 | 1990-09-19 | Idemitsu Kosan Company Limited | Electroluminescent element |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Section Ch Week 9110, Derwent World Patents Index; Class A85, AN 91-067947 * |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5586879A (en) * | 1994-07-05 | 1996-12-24 | Ford Motor Company | Fluorescent electroluminescent lamp |
EP0691798A3 (en) * | 1994-07-05 | 1996-07-17 | Ford Motor Co | Fluorescent electroluminescent lamp |
EP2267801A1 (en) * | 1996-06-26 | 2010-12-29 | OSRAM Opto Semiconductors GmbH | Light-emitting semiconductor chip and light-emitting semiconductor component |
US9196800B2 (en) | 1996-06-26 | 2015-11-24 | Osram Gmbh | Light-radiating semiconductor component with a luminescence conversion element |
EP2284912A1 (en) * | 1996-06-26 | 2011-02-16 | OSRAM Opto Semiconductors GmbH | Light-emitting semiconductor device with luminescence conversion element |
EP2270876A1 (en) * | 1996-06-26 | 2011-01-05 | OSRAM Opto Semiconductors GmbH | Light-emitting semiconductor device with luminescence conversion element |
EP2270877A1 (en) * | 1996-06-26 | 2011-01-05 | OSRAM Opto Semiconductors GmbH | Light-emitting semiconductor device with luminescence conversion element |
US8071996B2 (en) | 1996-09-20 | 2011-12-06 | Osram Gmbh | Wavelength-converting casting composition and light-emitting semiconductor component |
WO1998054930A2 (en) * | 1997-05-27 | 1998-12-03 | Koninklijke Philips Electronics N.V. | Uv/blue led-phosphor device with enhanced light output |
WO1998054930A3 (en) * | 1997-05-27 | 1999-04-08 | Koninkl Philips Electronics Nv | Uv/blue led-phosphor device with enhanced light output |
US5813753A (en) * | 1997-05-27 | 1998-09-29 | Philips Electronics North America Corporation | UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light |
US5813752A (en) * | 1997-05-27 | 1998-09-29 | Philips Electronics North America Corporation | UV/blue LED-phosphor device with short wave pass, long wave pass band pass and peroit filters |
GB2349978A (en) * | 1998-07-06 | 2000-11-15 | Huang Fu Kuo | A light emitting device |
GB2406900B (en) * | 2003-09-25 | 2007-09-12 | Koito Mfg Co Ltd | Vehicular lamp |
US7168834B2 (en) | 2003-09-25 | 2007-01-30 | Koito Manufacturing Co., Ltd. | Vehicular lamp |
GB2406900A (en) * | 2003-09-25 | 2005-04-13 | Koito Mfg Co Ltd | Vehicle indicator lamp with LED and filter |
US10488709B2 (en) | 2014-06-25 | 2019-11-26 | Samsung Display Co., Ltd. | Fluorescent sheet and light unit and liquid crystal display including the same |
Also Published As
Publication number | Publication date |
---|---|
CN1084690A (en) | 1994-03-30 |
KR100228515B1 (en) | 1999-11-01 |
KR940003423A (en) | 1994-02-21 |
JPH0623195U (en) | 1994-03-25 |
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