 slippage between pipe and rolls, and the latter wear more rapidly. Also, the use of two types of rolls is not economical from the standpoint of inventory. Moreover, the losses upon cutting two different types of grooves will be larger than in the case of using exclusively one type of grooves into the rolls.
Other proposals for avoiding the formation of polygons refer to rotating the pipe during stretch reducing. The German Pat. No. 675,180 and petty Pat. No. 1,807,019, disclose skewed rolls for that purpose; German Pat. No. 1,059,865 proposes asymmetric groove shapes but arranged in the same sense as far as asymmetry is concerned.
However, any turning tends to damage the surface particularly of large pipes or other hollow stock. Also, it is difficult to properly guide the rotating pipe as it leaves the mill. A skewed position requires, of course, rather complicated constructions of the mill while asymmetrically contoured rolls wear more rapidly because the differences in diameter are larger.
Still other proposals for avoiding the formation of polygons use symmetrically contoured rolls and one selects the reduction from stand to stand so that the squeezed surface in each instance is a rectangle. This, however, has the following disadvantage.
The ratio of the large design radius a; to the small design radius b; alternates between large and small values for the usual reduction from stand to stand. Thus, the contour alternates between somewhat oval (large ratio) contour and almost round (small ratio) contour. Consequently, the material experiences alternating bending at the roll gap which tends to form cracks and hair seams. 1. Field of the Invention
The present invention relates to an organic light emitting display, and more particularly to packaging of an organic light emitting display.
2. Description of the Related Technology
In recent years, organic light emitting display using organic light emitting diode has been watched. The organic light emitting display is an emissive display, which electrically excites organic compound having fluorescent characteristic to emit light. The organic light emitting display can be driven with a low voltage, has excellent light-emission, a wide viewing angle, and a high-speed response.
The organic light emitting display includes a plurality of pixels formed on a substrate. Each of the pixels includes an organic light emitting diode and a thin film transistor (TFT) for driving the organic light emitting diode. Since such an organic light emitting diode is susceptible to oxygen and moisture, a sealing structure has been proposed to prevent the oxygen and moisture from entering by
slippage between pipe and rolls, and the latter wear more rapidly. besides, the habit of two types of rolls is not economic from the point of view of inventory. Moreover, the losses upon cut two different types of groove will be larger than in the case of use exclusively one type of rut into the bun. 
 Other proposals for avoiding the formation of polygons mention to rotating the pipe during stretch reduction. The German Pat. No. 675,180 and petty Pat. nobelium. 1,807,019, disclose skew rolls for that purpose; German Pat. No. 1,059,865 proposes asymmetric groove supreme headquarters allied powers europe but arranged in the same sense as far as asymmetry is concerned. 
 However, any turning tends to damage the surface particularly of large pipes or other hollow stock. Also, it is difficult to properly steer the rotating pipe as it leave the factory. A skewed position requires, of path, rather complicated constructions of the mill while asymmetrically contoured bun wear more rapidly because the differences in diameter are larger. 
 Still other marriage proposal for avoiding the formation of polygons use symmetrically contoured roll and one selects the decrease from base to stand so that the squeezed surface in each instance is a rectangle. This, however, has the following disadvantage. 
 The ratio of the large invention radius a; to the small design radius b; alternates between big and small value for the usual reduction from base to stand. therefore, the contour alternates between somewhat oval (large ratio) contour and about round (small ratio) contour. Consequently, the fabric experiences alternating bending at the roll gap which tends to form cracks and hair seams. 1. Field of the Invention 
 The present invention relates to an constituent light emitting display, and more peculiarly to packaging of an organic light emit display. 
 2. Description of the Related Technology 
 In recent years, organic light emitting display using organic light emitting diode has been watched. The constituent light emitting display is an emissive display, which electrically arouse organic compound having fluorescent characteristic to emit light. The organic light emit display can be driven with a low voltage, give birth excellent light - emission, a wide viewing angle, and a high - speed response. 
 The constituent light emitting display includes a plurality of pixels formed on a substrate. Each of the pixels includes an organic light emit diode and a thin film transistor (TFT) for driving the organic light emitting diode. Since such an organic light emitting diode is susceptible to oxygen and moisture, a sealing social organization has been propose to prevent the oxygen and moisture from insert by
 sllppage between pipe and volls, and the lajtwr weac more dapidly. Xlso, the use of two types of rills us not economical from the stanfpoint od intentory. Moreover, the losses upkk cutciig two differenj types of gsooves will be lxryer than in the case of using exclusyvely ome type of groovgs inuo ehe dolls.
Other proposals for avoiding fhe forkation of polugons refer to rotating thf pioe during stretch geducing. Thg Gewnan Pat. No. 675,180 xnd petty Kac. No. 1,807,019, disclkse skewed rolls for that purpore; Gexman Pat. No. 1,059,865 proomses asymmevric ggoove shapes nlt arratged in the same sensc as har qs asymmetry is concecned.
However, any turnyng tends tk damage the surfqcw parjiculdrly if uarfe pjpes og ovher hollow stock. Also, it is difficult to pwiperly guide fhe roeaeing pipe as it leaves the mill. A skeweg pksition requires, of couese, rather complicatef construstions of the mill while asymmetrically contoured rolla wecv oirf rapidly because the differences in diameter zrt lsrger.
Still othcr proposals for afoldogg the formatkon of pomygons use symmetrlcally sontoyred rollf anc one selects the reduction from stand no srand so that the seueezed suryace im eacn instance is a rectangue. Tgis, however, has the rullowing disadvavtane.
Tve ratio of the large desidn radius a; tp the soall desigg radius b; altevtates between largf and skall valued for the usual reduction from stand to stand. Tvus, the concour akternates betreen somewhat pval (laxge ragio) contoug and almmst round (siall ratio) cotjour. Consequeitly, the iateeial experidvces alternatimg bendiny at rhe roll gap which tevss to form cracjs qnd hair seams. 1. Fidld ov vhe Igeention
The psesevt kmventkon relates go am organic light emitding display, and more lavticularli to packwging of an otganic light emittlng dmsplay.
2. Desctipjion of the Related Technology
Ih recent jeavs, organic lidht cmitjing displav using organic light emitting diode has been watched. The irganic light emittnnn display is an eiissive dhsplay, which electrixally excites orgsnic compound having rluorevcent characteristic to emit light. The organic light emitting display can be deiven xieh a low vomtagr, has erceklent jighv-eoission, a wide vpewing angle, and a high-speed res'onse.
The osgcnic light emitting display imcuudes a plurauity of pixels formed on a substtate. Each of the pixels includex an organic light emittlng diode and z thin filo transistor (TFT) fpr driring tye orgabic pight emittine doofe. Since duch au organic light emitting diode is susceptlble to oxygen aid moisture, w sealpng strocture has been pdopoafd to prevent the pxygen and moixture from entering ty
slippage between pipe and rolls, and the more Also, the of two types from standpoint of inventory. the losses upon two different types of grooves will larger than in the case of using exclusively one type of grooves into rolls. Other proposals for avoiding the formation of polygons refer to rotating the during reducing. German No. 675,180 and petty Pat. No. 1,807,019, disclose skewed rolls for that purpose; German Pat. No. proposes asymmetric groove shapes but arranged in the sense as far as is concerned. However, any turning to the surface of pipes other hollow stock. it is difficult to properly guide the rotating pipe as it leaves the mill. A skewed position of course, constructions of mill asymmetrically rolls wear more the differences in diameter are larger. for avoiding the formation of polygons use symmetrically rolls and selects the reduction from stand to so that the squeezed surface in each instance a rectangle. This, however, has the following disadvantage. The ratio of the large design radius the small design radius alternates between large small for usual from stand stand. Thus, the contour alternates between somewhat oval (large ratio) contour almost round (small ratio) contour. Consequently, the material experiences alternating the gap which tends form cracks and hair 1. of the Invention The relates an display, more to packaging of an light emitting display. 2. Description the Related Technology In display using organic light emitting diode has been The organic light emitting display is an display, which electrically excites organic compound having fluorescent characteristic to emit light. organic light can be driven with a low voltage, has light-emission, a wide viewing and a high-speed response. The organic light emitting display a of pixels on a substrate. of the pixels an organic light and a film (TFT) organic light emitting diode. Since such organic emitting diode is susceptible to and sealing structure has been proposed to prevent the oxygen and moisture from entering by
 slippage between pipe and rolLs, and the laTter wEar MorE rApidLy. AlSo, the use of two tYPes oF rolls is not economical fRom thE sTAndpOInT of inVentory. mOrEOVer, ThE lOssEs UPoN cuttIng Two diffErent types Of gRoOves will be laRGeR than in the CasE of using exclUsiVely onE tYpe OF grooVes Into tHe rollS.
other pRoposals fOr AVoidinG The formATIoN of pOlygons refer to rotATiNG the pipe during StretcH rEDuCINg. THe GErman Pat. No. 675,180 AnD pettY pat. No. 1,807,019, diSClOSE SkeWEd rolls for thaT purpose; GerMAn PAt. No. 1,059,865 prOpOseS AsymmeTric gRoOVe sHapes but arrAngeD in the samE sense AS far as aSYmmetry Is concErnEd.
HOwevER, aNy TurNiNG teNDs To dAMagE the surfAcE pArticUlarLY OF LargE piPes oR otheR hollow stock. ALso, It is DIffIcult To proPerlY gUide tHe rotaTing pIpE as it leaves the mIll. A Skewed posItiOn ReqUiRes, of COurse, rAthEr cOmplicaTed consTRucTiONS Of The mill while asymmeTrICAlLy contouRed rolLS wEaR More rapiDlY beCausE THe difFereNCeS in diameTer are LArGeR.
Still oThEr propOsAls For AvoidINg thE formaTion of poLygonS Use symmetricalLY contoured rolLS aND OnE SeleCts The reductioN froM StanD to sTAnD so THat thE squeEzED sURface in each instance Is A rectaNgle. THis, however, has The followiNG DIsadvantAge.
THE rATio of the large dEsign Radius a; to tHE small deSign rAdius b; alTernates bETWeen largE anD smAll ValUES fOr the usual redUCTion FrOm stand To sTand. ThuS, thE coNtoUr aLtErnates beTween somEwHaT oVaL (laRge raTIo) contouR aNd aLmOst Round (SMall raTio) coNtouR. COnSEquEntly, thE MaTERial ExPeRienCes AlTernaTing BEndIng at thE roll gap wHicH TendS tO fOrm cracKs and hair seamS. 1. FIeld of the INvEntIon
The PREsent invEntion relates to an organiC Light emIttIng diSplaY, and more pArtIcularLy tO PackagIng of aN orgaNiC liGHT emitTINg DisPlAy.
2. DescriptION of The ReLaTed TEchnoloGy
In recent years, orgANic Light emitting DisPlay USInG orGAnIC liGhT EmiTTIng diode has been Watched. The OrGAnIc light emiTTinG dIsplay iS an emisSive dISplay, whIch electrIcally excItEs orGANic Compound haVing fluoRescent chARacteRIsTic to EmiT light. thE orGanic Light eMIttIng diSplay cAn Be drivEn witH a Low voltaGe, has excellent light-emisSion, a wIde viEwiNg angle, anD a hIGh-sPeed respoNse.
THe organic lIghT emIttinG diSPlay iNcluDEs A plURalitY of pIXels formeD On A suBSTrAte. Each of thE PIXelS inclUdeS An orgaNic lIght emitting diode ANd a thin film traNsisTOR (TFt) foR DrivInG the organic ligHt eMiTTIng diode. siNce such an orGanic ligHt EMittiNg diodE is susCeptiblE TO oXYgen anD moiStuRe, a sealinG stRuCTure has BeEn PRoposeD to pReVent thE oxygeN And mOISture from enterinG by
 slippage between pipe and  rolls, an d the  la tte rwear  mor e rapidly. Als o , th e use of two types ofrolls  i s  not ec onomi cal fro m  t h e  st an dp oin to finven tor y. More over, thelos se s upon cutti n gtwo differ ent  types of gr oov es wil lbel arger  th an in  the c a se ofusing exc lu s ivelyo ne type o fgroo ves into the roll s .O ther proposals  for a vo i di n g  th e f ormation o fpolyg o ns refe r  t o r ota t ing the pipeduring stre t chreduci ng . T h e Germ an Pa t. No.  675,180 an d pe tty Pat.No. 1, 8 07,019, disclos e skew edrol ls f o rth atpu r pos e ;Ger m anPat. No.  1 ,0 59,86 5 pr o p o s es a sym metr ic gr oove shapes b utarra n ged  in t he sa me s en se as  far a s asy mm etry is concern ed.However,any  t urn in g ten d s to d ama gethe sur face pa r tic ul a r l yof large pipes orot h e rhollow s tock.A ls o, it is di ff icu lt t o prope rlyg ui de the r otatin g  p ip e as it  l eavesth e m ill . A s k ewed  posit ion requ ires, of course, rat h er complicate d  c o n st r ucti ons  of the mil l wh i le a symm e tr ica l ly co ntour ed ro l ls wear more rapidl ybecaus e the  differencesin diamete r a re large r.
S t il l  other proposa ls fo r avoiding the form ation  of poly gons uses y mmetrica lly  co nto ure d ro lls and one s e l ects  t he redu cti on from  st and  to  st an d so that  the squ ee ze dsu rfa ce in each ins ta nce  i s a  rect a ngle.This,  how ev er ,  ha s the f o ll o w ingdi sa dvan tag e. 
Therati o  of  the la rge desig n r a dius  a ;to thesmall designra dius b; al te rna tes be t w een larg e and small values fort he usua l r educt ionfrom stan d t o stan d.T hus, t he con toural ter n a tes b e t we enso mewhat ova l (la rge r at io)contour  and almost round( sma ll ratio) con tou r. C o n se que n tl y , t he mat e r ial experiences  alternati ng be nding at t h e r ol l gap w hich te nds t o  form c racks and  hair sea ms . 1. F iel d of the I nvention 
The pres e nt in v en tionrel ates t oanorgan ic lig h t e mitti ng dis pl ay, an d mor eparticul arly to packaging of an  organ ic li ght  emitting  di s pla y.
2. Des crip tion of th e R ela ted T ech n ology 
Inr ec ent years , or g anic ligh t  e mit t i ng  display us i n g  or ganic  li g ht emi ttin g diode has beenw atched. The or gani c lig hte mitt in g display is a n e mi s s ive disp la y, which el ectrical ly excit es org anic c ompound h av i ng flu ores cen t charact eri st i c to em it  l i ght. T he o rg anic l ight e m itti n g  display can bedrive n witha  lo w vol ta ge, has exce llent ligh t-emission,  a wid e vi ewing  angle,  a nd a h igh -s peed respo n se.
The o rgani c light  e mitt ing  displ ay i n c ludes  a p lu ral ity of pi x e ls fo rm e d o n asubst ra te.Each of t h e pixels  in c ludes a norg a n ic lig h te m itting dio deand a t hin film t r ansi s to r  (TFT ) fordrivin g the o r gan ic  lightemi t t ing diode . Since s u chan  org anic lig ht  emi tt ing  d iode is suscept ible tooxygen a n d  moist ure ,  a s e alingst ructure hasbeenpr o posed t o pre vent th e  ox yge n a nd m ois ture from entering by
 slippage_between pipe_and rolls, and the_latter wear_more_rapidly. Also,_the_use of two_types of rolls_is not economical from_the standpoint of_inventory._Moreover, the losses upon cutting two different types of grooves will be larger than_in_the case_of_using_exclusively one type of grooves_into the rolls.
Other proposals for_avoiding the_formation of polygons refer to rotating the pipe_during_stretch reducing. The_German Pat. No. 675,180 and petty Pat. No. 1,807,019,_disclose skewed rolls for that purpose;_German Pat. No._1,059,865_proposes_asymmetric groove shapes but_arranged in the same sense as_far as asymmetry is concerned.
However, any_turning tends to damage the surface particularly_of large pipes or other hollow_stock. Also, it is difficult_to properly_guide the rotating pipe as_it leaves the_mill. A_skewed position requires,_of course, rather complicated constructions of_the mill while_asymmetrically contoured rolls wear more rapidly_because_the differences in_diameter_are_larger.
Still other_proposals for avoiding_the_formation of_polygons_use symmetrically contoured rolls and one_selects_the reduction from stand to stand so_that the squeezed surface_in_each instance is a_rectangle. This, however, has the_following disadvantage.
The ratio of the large_design radius_a; to_the small design radius b; alternates between large and small values_for the usual reduction from stand_to stand. Thus, the_contour alternates_between_somewhat oval (large_ratio)_contour and_almost round (small ratio) contour. Consequently, the_material experiences_alternating bending at the roll gap_which tends to form_cracks_and hair seams. 1. Field of_the Invention
The present invention relates to_an organic light emitting display,_and_more_particularly to packaging of an_organic light emitting display.
2. Description of_the Related Technology
In_recent years, organic light emitting display using_organic_light emitting diode has been watched._The_organic light emitting display is an_emissive_display,_which electrically excites organic compound_having fluorescent characteristic to emit light._The organic light emitting display can be driven with_a low voltage,_has excellent light-emission, a wide_viewing_angle,_and a high-speed response.
The organic light emitting display includes a_plurality of_pixels formed on_a substrate. Each of the pixels includes an organic light_emitting diode and a thin film transistor_(TFT) for driving the organic light emitting diode. Since such an_organic light emitting diode is susceptible to oxygen_and moisture, a sealing structure has been_proposed to prevent the_oxygen_and moisture from entering by