`
`City ofNew Y ork, State ofNew Y ork, County of New York
`
`1, Aurora Landman, hereby certi命 that the document is a true and accurate translation
`from Japanese (JP) into English of Japanese Examined Patent App1ication Publication
`
`Number H08-7614.
`
`1 declare under penalty of perjwγthat the foregoing is 仙e and correct. Executed on
`August 14, 20 17.
`
`止
`
`Aurora Landrnan
`
`一
`
`Swom to before me this
`August 2 1, 2017
`
`二咐
`
`川M一…
`
`叫mv
`
`Stamp, No個ry 扒出lic
`
`THREE PARK AVENυE , 39TH fLOOR , NEW YORK. NY 10016 I T 212 689β5SS 1 F 212.68腎, 1059 I WWW TRANSPERfECT .COM
`OFFICES IN 90 (ITIES WORI.DWIDE
`
`TCL 1007, Page 1
`
`
`
`(19) Japan Patent Office (JP)
`
`(12) Japanese Examined Patent
`AppHeation PubHeati。且 (A)
`
`( 11 ) Japan的 e Examined Patent
`App lication PlIblication NlImber
`
`H08-7614
`
`(43) PlIb lication date Janllary 1 2多 1 996
`
`JPO fi le nllmber
`
`F f
`
`Technical indications
`
`(5 1) fn t. C1.6
`F2 1S 11100
`G02F 11133
`HO IL 33/00
`
`fdentification code~可
`E
`
`535
`
`L
`T、i
`
`Reqllest for examination Not yet reqll的ted NlImber of claims 2 OL (Total of 4 pages)
`
`(2 1) Application nllmber
`(22) Date ofapplication
`
`H06-1 34763
`Jtme 17. 1994
`
`(7 1) App licant
`
`(72) fnventor
`
`000226057
`N ichia Chemical fndllstrie~可 Ltd
`49 1 100 Oka. Kaminaka-Cho. Anan-Shi.
`Tokushima Prefectllre多 Japan
`Yoshinori SHfMfZU多 c/o N ichia Chemical
`fndllstri e~可 Ltd
`49 1-1 00 Uenakamachioka, An nan City多
`Tokyshima prefecture多 Japan
`
`(54) (TlTLE OF TH E INVENTION)
`
`SHEET -SHAPED LIGHT SOURCE
`
`(
`57) (ABSTRACT)
`To provide a sheet like light sOllrce in
`(PURPOSE)
`which a bllle light emitting diode is lIsed and can emit a
`tmiform white light
`A light emitting diode I is optically
`(CONSTITUTlON)
`cormected to the terminal sllrface of a transparent 1 ight
`gllide panel 2 多 in addition to having a light scattering layer
`3 coating a white powder which scatters flllore~可 cent light
`on either ofthe main sllrfac的 of said light gllide pane l 2多 as
`well as the provision of a transparent fi lm 6 on the main
`sllrface side ofthe light gllide pane l 2 of the reflective side
`and on said
`light scattering layer 3 多 and eqllipping a
`flllorescent sllbstance emitting flllore~可cent light by means
`of light emi可s ion excitation of said light emitting diode I on
`this fi lm 6
`
`5
`
`4
`
`a
`
`TCL 1007, Page 2
`
`
`
`(SCOPE OF PATENT CLAIMS)
`light source characterized by
`(C LAIM 1) A sheet-shap巴d
`optically connecting a blue-colored light e01itting diode 1 to at
`least one location of the ter01inal surface of a transparent light
`guide panel 2, in addition to having a light scattering layer 3
`coating a white powder on either of the O1ain surfaces of said light
`guide panel2, a nd the pro vision of a transpa間nt fìl O1 6 on the O1ain
`surface side of the light guide panel2 ofthe reflective side and on
`said light scattering layer 3, and equi pping a f1uorescent substance
`e01itting fluorescent light causing light e01ission excitation of 胡id
`blue light e01itting diode 1 on thesurface ofthis fìl O1 6.
`The sheet-shap叫 light source clai01叫 in clai01 1
`[CLAIM 2)
`characterized by the i01ple01entation ofa O1inute roughness on the
`surfacecontacting the light guide panel ofsaid fìl O1.
`(【沌TAILEO OESCRIPTlON OF THE INVENTlON)
`[0001)
`rTECHNICAL FI ELO OF THE INVENTlON) The present invention
`relates to a sheet-shaped light sources e01ployed in backlights of
`display品, illU01i nat巴d operating switches and the like, in particular ,
`it relates to sheet-shaped light sources which O1ay be e01ployed to
`advantage as the back lights for liquid crystal display品。
`[0002)
`[PRIOR ART) As sheet-shap叫 light sources for use in
`the
`in notebook
`backlights of liquid crystal displays e01ployed
`CO O1puters, word
`the
`like,
`for exa01ple,
`proce鈞。時 and
`e1ectroIU01i nescence, and cold cathode
`tubes a悶 e01p loyed.
`ElectrolU01inescence is a sheet-shaped light source, whereas cold
`cathode tubes becO O1e sheet-shap叫 light sources when u泌d with a
`di ffusion plate, and currently the color ofthe e01itted light ofthese
`backlights arealO1ost all white.
`r000 3) On the other hand, light e01itting diodes (hereafìer refeπed
`to as LEO) are SOO1eti01es e01ployed as the light sources for 山ein
`backlights. H.owever, when LEO are e01ployed to derive a white(cid:173)
`colored e01itted light, because conventionally the light e01i泌的n
`power of b lue-colored LE 0 h惱 on Iy a few tens 0 f O1icrowatt品, in
`order to i01ple01ent white light e01ission using other red-colored
`LEO, and green-colored LEO, there is the big defect that the color
`variation because of the diffìculty of O1atching the characteristics
`of each of these colors of LE O. Mor切 ver, in order to COO1bine
`three basic colors of LEO, even if they are disposed g切O1etrically
`in the sa01e locus on the sa01e planar 叫rface, when viewed fro01 a
`proxi01al position the backlights using these LEO cannot enable a
`unifor01 white-colored light source. Therefo悶, as the sheet-shaped
`light source of the current white-colored liquid crystal b acklight品,
`the reality is that there is a breakout of the use of cold cathode
`tubes in large-scale screen品, and e1ectrolU01inescence in S01all scale
`scale screens, and white-colored
`to 01叫iu01
`light e01i晶晶ion
`back lights e01ploying LEO are al O1ost unknown.
`r0004) Moreover, as white-colored
`light e01ission, or as a
`O1onochrO O1e light source, there have been contrivances at color
`conve時ion by resin packaging the peri phery of a blue-colored
`LEO chip including fluorescence substances in parts thereo f, but
`because the peri phery of the chi p is affected by light rays with a
`stronger iπadiation strength than sunlight, the deterioration of the
`fluorescent substance is a proble01, and
`this is particularly
`noticeable in organic fluorescent dyes. Further01ore, ionic organic
`dyes ca山e an electro phoresis resulting 府001 the direct cuπent
`electrical fìeld proxi01al to the chi p, giving rise to the possi bility of
`variation in the color to ne. In addition, the conventional blue(cid:173)
`colored LEO did not have suffìcient output power to cause color
`changes in the f1uorαcent substance, and for exa01ple, even i f the
`enabled color conversion, it could not be 山ed in practice.
`r000 5)
`
`Japanese Examined Patent App lication Publication H08- 76 14
`
`(2)
`
`2
`[ PROI3LEM TO I3E SOLVEO I3Y THE INVENTION) 8ecause the pr帥nt
`invention was e nabled in order to resolve these defec峙, the object
`ther切 f is not only the pro vision of a sheet-shaped light source
`enabling white light e01ission which can be us吋O1ainly 惱 a
`backlight, using LEO, but also the pro vision of a sheet-shap叫 light
`source enabling the observation of uni for01 white light e01ission,“
`well as the pro vision of sheet-shaped light sources enabling light
`e01i晶晶ion in any color other than white light, availing of the
`su perior reliability which is a characteristic of LEO品, which O1ay
`be e01ployed in all types of operating 昌、,vitches and the like.
`[0006)
`rMEANS FOR. SOLVING THE PR.O自LEM) The sheet-shap叫 light
`source of the present invention is characterized by optically
`connecting a blue-colored light e01itting diode 1 to at least one
`location ofthe te01linal surface ofa 甘ansparent light guide panel2,
`in addition to having a light scattering layer 3 coating a white
`powder on either of the O1ain surfaces of said light guide panel 2,
`and the pro vision of a transparent fìl O1 6 on the O1ain surface side
`of the light guide panel 2 of the ref1ective side and on said
`diffusion layer 3 (hereafter, the O1ain surface ofthe di ffusion layer
`side is referred to as the second O1ain surface.), and providing a
`transparent fìl O1 6 on the O1ain surface side (hereafter refeπed to as
`the fì削O1ain surface.) of the light guide panel 2 of the opposite
`side to said diffusion layer 3, and equi pping the surface or the
`interior O1eans of that fìl O1 6 with the fluorescent substance
`e01itting f1uorescent light excit叫 b y O1eans ofthe light e01ission of
`胡id blue-colored light e01itting diode 1.
`[0007) Figure 1 is a plan dra\ving of the light guide panel 2 of the
`sheet-shaped light source ofthe present invention as seen fro01 the
`second O1ain surface side. The light guide panel2 is COO1prised ofa
`transparent O1aterial 叫ch as acrylate, glass and the like, and by
`providing a blue-colored LEO 1 buried in the te01linal surface of
`that light guide panel 2, the light 甚uide panel 2 a nd the blue(cid:173)
`colored LEO 1 are optically connect吋 Now,
`in the prωent
`invention, the optical connection of blue-colored LEO 1 and the
`te01linal surface of the light guide panel 2 si01ply O1eans that the
`light ofthe blue-colored LEO is inducted fro01 the te01li nal surface
`of the light guide panel 2, for exa01ple, and of course the blue(cid:173)
`colored LEO 1 is provided buried therein as illustrated in this
`fìgure, a nd this O1ay be e01bodied by adhering the blue-colored
`LEO, or by inducting the e01itted light of the blue-colored LEO
`into the ter01inal surface of the light guide panel 2 using optical
`fìber and the like.
`r0008) Next, the diffusion layer 3 diffuses light into the light guide
`panel 2 using white pig01ent. In particular 胡id di 作'usion layer 3 is
`enab led in a striped shape in figure 1, in order that the surface
`IU01i nosity ofthe fìrst O1ain surface side be fix叫, the pattern is one
`in which the surface area of the di 仟'usion layer 3 is ca山ed to be
`red叫“ with respect to the unit surface area of the second O1ain
`surface side as it approaches the LE O 1, in addition, the surface
`area of the ter01inal O1eans of the second O1ain surface O1ost distal
`府001 the LEO 1 is slightly les品 than the O1axi01al surface area.
`Here, the _ in figure 1 I可)I'esents the pattem of the diffusion lay釘
`3. In fìgure 1, the configuration is one wherein six blue-colored
`LEO are disposed in one te01linal surfac缸, but if the light guide
`panel is square shaped, it goes without saying that LEOs are
`connected to all of the four te01li nal surface品, and the nU01ber of
`LEOs is not particularly li01ited. In addition, by O1eans of the
`disposition state ofthe LEO, the coated shape and the coat巴d state
`of the diffusion layer 3 O1ay be varied appropriately in order to
`have a unifor01 sheet shap叫 light e01i晶晶ion as observed fro01 the
`fìrst O1ain surface side.
`[0009)
`rO陀R.ATION) Figure 2 is a sche01atic cross-section drawing of
`when the sheet-shap叫 light source of the present invention is
`e01bodied, for exa01ple,“ the backlight ofa liquid crystal panel.
`
`TCL 1007, Page 3
`
`
`
`Japanese Examined Patent App lication Publication H08-76 14
`
`、
`
`‘ .J
`
`(
`
`令、J
`
`4
`rEM 自OOIM ENT 1) A di ffusion layer 3 is formed by se時間 printing
`in a st付 ped pattern 惱 illustrat叫 in fìgure 1 on one surfaçe of an
`approximately 2 mm thick açryliç sheet. The diffusion layer 3 is
`fom也d by printing a white-çolored substançe çomprised ofbarium
`titanate dispersed in an açryliç type binder.
`rOOI 月 fhe açryliç sh問t wh訂閱n thedi 仟'usion layer 3 was fom、“
`指 desçrib巴d a bove is çut into a desired pattem, and after polishing
`all the temlinal surfaçes (çut surfaçes) of the açryliç sheet, a light
`guide panel2 with a diffusion layer 3 fomled ther切n is derived by
`means of forming a ref1eetive layer 4 çomp吋泌d of aluminum on
`the polished surfaçes.
`rOO 16) Next, a fluoresçent light layer 5 is formed on a fìlm 6
`having minute roughness formed on the surfaçe thereo f. The
`fluoresçent light layer 5 is a çoating formed 府om an açryliç type
`binder çontaining a mixture of f1uoreseent pigments of equal
`amounts of FA-OO 1 manufaçtured by Sinloihi Chemiçals, whiçh is
`a red-çolored f1uorωçent pigment and FA-D05 whiçh is a green(cid:173)
`çolored f1uoreseent pigment manufaçtured by thesame çompany.
`[001 7) H.oles a悶 pro vid叫 in six loçations ofthe temlinal surfaçes
`of 胡id light guide panel 2, and one eaçh of blue-çolored LEO 1
`çomprised of a gallium nitride çompo und semiçonduçtor having a
`light emission power of 1200μW and a light emission wavelength
`of 4日 o nm are buried in eaçh hole, Next, the fìlm 6 whereon the
`fluoresçent lights layer 5 is fomled as d臼çribed a bove is dispo泌d
`on the emitted light observation surfaçe side, and a ref1eçtive panel
`çoating a barium titanate layer 7 is disposed on an aluminium base
`8 on the di 仟'usion layer 3 side, and a çompletely sheet shaped
`uniform white light emi泌的n is derived 府om the first main surfaçe
`side when employed as the light sourçe of a baçklight. The
`luminous intensity w.制 55 çdlml.
`rOOI 日)rEM 自OOIM ENT 2) Almost 叫 ual amoun尬。 f Lumogen F
`by BASF as a yellow çolored
`Yellow-D的 manufaçtured
`fluoresçent pigment and-240 manufaçtured by the same çompany
`as an orange çolored fluoresçent pigment were mixed, and the
`fluoresçent pigments and açrylic resin were di晶晶。Ived in butyl(cid:173)
`çarbitol açetate and çoated on
`to a film 6 whereon minute
`roughnes品 had been impart巴d. And when a sheet-shaped light
`50urçe of the present invention was enabl叫“ in embodiment 1
`other than the above, and almost unifoml sh間t shaped light
`emi晶晶ion was observed. Mor.切 ver, when employed as the light
`50urçe for use in a baçklight in the same manner, a çompletely
`uniform sh問t shap巴d light emission was observed.
`rOOl9)
`rEl'l'EC的 01' THE INVENTlON) As deseribed abo ve, the sh阻t
`shap巴d light 50urçe of the present invention emp loy品 blue-ço lored
`LEO, in addition to having a diffusion layer 3 çoating white(cid:173)
`çolored powder onto one of the main surfaçe sides ofa light guide
`panel, in addition to disposing a 甘ansp arent film 6 çoating a
`fluoresçent substançe enabling wavelength çonversion by means of
`blue-çolored LEO on the other main surfaçe side, enabling the
`embodiment of a sh間t-shap叫 light sourçe by means of a highly
`reliable LEO. Mor切 ver, beeause the white-çolored powder of the
`diffusion layer 3 has the effeet of ref1eeting and seattering the
`emitted light of the blue-çolored LEO, the amount of fluoresçent
`su bstançeemployed n認d only be a small amount. Furthemlore, by
`fomling minute surfaçe roughn臼品。n film 6, the light diffusion
`e ffeçt is inçreased, and film 6 enables the prevention of the
`fomlation of interferençe fringes stretçhed açro晶晶 the light guide
`panel 2. In addition, fortunately, beeause there is no direçt çontaçt
`f1uorαçent substançe, the
`between
`the LEO çhi p and
`the
`dete付oration of the fluoresçent substançe is less, and variation in
`the çolor tone of the sheet-shap叫 light sourçe over long periods
`does not oççur. Moreover, in relation to the ço lor tone, the
`provision of any çolor tone induding white çolor is enabl叫, by
`means of the types of f1uoreseent light 叫bstançes of the
`fluoresçent light layer 5, mor.切 ver beeause the f1uoreseent light
`su bstançe is pro vided on a film, simple çhanging out of the çolor
`tone of the sheet-shap叫 light 50urçe is enabled by just çhanging
`the fìlm.
`
`3
`fhis disposes a di ffl山ing ref1eçtive layer 7 çomprised of, for
`example, barium titanate, titanium oxide, aluminum oxid巴, and the
`like, on the second main surfaçe side of the sheet-shaped light
`50 urçe represent叫 in fìgure 1, and a ref1eetive panel laminating a
`base 8 çomprised of, for example, aluminum, and a transparent
`fìlm 6 is provid叫 disposed on the surfaçe of the fìrst main surfaçe
`side 、叫 th minute roughnes品 therein , and the f1uorαçent substançe
`emitting fluoresçent light when exçit叫 by means of the light
`emi晶晶ion ofa blue-çolored LEO 1 is çoated on to the rough surfaçe
`ofthis film 6.
`rOO 1 0) Firstly,“ illustrat巴d by the aπow in fìgure 2, part of the
`light emitted from the blue-çolored LEO 1 is iπadiated to the
`exterior other than to the light guide panel 2 in the viçinity of the
`çhip, but most of the light in the light guide panel 2 reaçhes the
`temlinal surfaçe of the light guide panel 2 while being repeatedly
`totally ref1eet叫。The light reaçhing the terminal surfaçe is refleet吋
`by the ref1eçtive film 4 fomled over the entire temlinal surfaçe, to
`enable repeated total ref1eçtion. On this oççasion, the light is
`seattered by means of the di 作'usion layer 3 provided on the second
`main surfaçe side of the guide panel 2, and part of the diffused
`f1uoreseent
`light
`is ab50rb叫 by the
`light
`layer 5 and
`simultan切usly wavelength modified and re刊diated, enabling the
`observation of light whiçh is a s仰的的is of thωe emitt叫 light
`ço lors wh iç h is observed 府。m the first main surfaçe side of the
`light guide panel 2. For example, with the sheet-shap叫 light
`50urçe providing a fluoresçent light layer 5 çomprised ofan orange
`ço lored f1uorωçent pigment, the çolor ofthe light emitt叫府om the
`blue-çolored LEO 1 çan be observed to beeome white-çolored as a
`result ofthe earlier mentioned e ffeçt.
`[0011) In partiçular, in this invention, the main emission peak of
`the emitted light wavelength of one blue-çolored LEO is shorter
`than 500 nm, and that light emission output power is greater than
`200μW and more preferably that output power needs to be greater
`than 300ρ/.1. 'fhe reason is that when the emitted light wavelength
`is greater than 500 nm, theenablement ofall theçolors is diffiçult;
`mor切ver, when the light emission power is 1臼品 than 200μW, for
`example, there is a tendençy for diffìçulty in e nabling a sheet
`shap叫 light emission light sourçe with 叫的çient brightness and
`uniformity, even when the number of optiçally çonneet叫 blue
`çolored LEOs to the terminal surfaçe of the light guide panel is
`inçreased.
`[001 2) Additional旬, in Japanese patent appliç別ion number H05-
`318267, the invento時 proposed a sheet-shaped
`light 50urçe
`enabling a uni form white-çolored emitted light, by means of the
`fomlation ofa f1uoreseent light di 仟'usion layer on the main surfaçe
`side of a light guide panel of the opposite side to the emitted light
`observation surfaçe. However, with this method, in respeet of the
`derived sh阻t-shap ed light sourçe, the fluoresçent light di 仟'usion
`layer formed on the light guide panel varying the çolor to ne is
`peeled, and a fluoresçent light diffusion layer must be printed
`thereto onçe more to enable the desired çolor tone. However, with
`this invention, the f1uoreseent light layer 5 and the diffusion layer 3
`independently of eaçh other, and beeause of
`are enabled
`fluoresçent light layer 5 detemlining the çolor tone is form巴d on a
`fìlm whiçh çan be adhered and removed, the çolor tone çan be
`vari吋 easily by just çhanging the film fomling the fluoresçent
`light layer 5. Moreover, multiple çolors may be divided out and
`emitted simultaneously.
`[001 3) Moreover, beeause there is the enablement of roughn臨 in
`the surfaçe in çontaçt with the fì昀t main surfaçe side ofthe film 6,
`it is extremely e作èçtive in çausing diffusion ofthe emitt叫 light, in
`addition, the film 6 enables the prevention of the formation of
`interferençe 府inges stretçhed açross the light guide panel 2.
`[0014)
`rEMBOOIM EN'的 OI' TH E INVENTION)
`
`TCL 1007, Page 4
`
`
`
`Japanese Examined Patent App1ication Pub1ication H 08- 76 14
`
`(4)
`
`6
`* [Figu re 2] A schematic cross-sectio n dra\\~ng of a backlight
`
`light
`
`source of a n
`
`5
`I似l20] On the other hand. 叫 the expectations side of the
`Ol悶悶cent light layer 5, by employi ng the most preferab ly u臼d
`new colored LEO with a light emission power of greater than 200
`μW. the ena blement of a large arca bright sheet-shaped light
`source e fficienlly conve巾 ng Ihe wavelength by means o f 泊
`fluorescenl subslance is enablω . In Ihis manner, Ihe sheel-shaped
`lighl ωurce of Ihe p 悶揖nl inven lion may be employed nol only 崗
`山C lighl source for 山e in backlights. it may also be employed in
`illuminaled operatin g s witches employi ng nuorescent substances
`[ BIUFF I)ESC RIPTION 0 1' 1 111' I)RAWINúS)
`r ~ igure 1]
`A plan view or the light guide panel 2 of the sheet(cid:173)
`shapωlight source of an embodiment of the p悶ent invent ion
`when vie\'咽d from the diffusion layer 3 side.
`
`the
`implementing
`shec卜shaped
`embodiment ofthe pr自ent invcnt ion.
`f EXPLANATlON 0 1' SVMIIOI.S]
`8lue-colored LEI)
`1
`Light guide panel
`2
`3
`Oiffu訓。n layer
`Reflective layer
`4
`5
`Fluo悶scent light laycr
`6
`Film
`Oiffusing 間nective layer
`7
`Aluminium base
`8
`
`[F igure 1)
`
`z
`
`[F igure 2)
`
`6
`
`4
`
`s
`
`區 、』盔,‘-、
`
`TCL 1007, Page 5
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