(12) United States Patent Segawa et al.

Transcription

1 US B2 (12) United States Patent Segawa et al. (10) Patent N0.: (45) Date of Patent: US 8,749,457 B2 Jun. 10, 2014 (54) (75) (73) (21) (22) (65) (63) (51) (52) (58) ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE MANUFACTURING METHOD AND ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE Inventors: Yasuo Segawa, Hyogo (JP); Tetsurou Nakamura, Kyoto (JP); Shinya Ono, Osaka (JP) Assignee: Panasonic Corporation, Osaka (JP) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 303 days. Appl. N0.: 13/403,489 Filed: Feb. 23, 2012 Prior Publication Data US 2012/ A1 Jun. 14,2012 Related US. Application Data Continuation of application No. PCT/ J P20 1 0/ ,?led on Apr. 5, Int. Cl. G09G 3/32 ( ) US. Cl. USPC /77; 345/694; 345/76; 345/82; 345/690; 345/204; 315/169.3; 313/463 Field of Classi?cation Search CPC..... G09G 2320/04; G09G 2320/041; G09G 2320/043; G09G 2320/045; G09G 2320/046; G09G 2320/048 USPC /76e83, 690e694, 204; 313/463e464, 483e512; 315/1693 See application?le for complete search history. (56) References Cited JP JP U.S. PATENT DOCUMENTS 6,473,065 B1* 10/2002 Fan /82 7,329,849 B2 2/2008 Kasai 7,719,492 B2 5/2010 Childs (Continued) FOREIGN PATENT DOCUMENTS / /2005 (Continued) OTHER PUBLICATIONS International Search Report in PCT/JP2010/002475, dated Apr. 27, (Continued) Primary Examiner * Lun-yi Lao Assistant Examiner * Saiful A Siddiqui (74) Attorney, Agent, or Firm * Greenblum & Bernstein, P.L.C. (57) ABSTRACT A method of manufacturing an organic electroluminescence display includes preparing a substrate including pixels. The pixels each include a drive transistor and a capacitor. The capacitor of a subject pixel is caused to hold a voltage Which corresponds to a threshold voltage of the drive transistor, and the voltage is read. A?rst signal voltage is obtained by adding a?rst correction parameter of the subject pixel to a second signal voltage corresponding to a single gradation level belonging to an intermediate gradation region or a high gra dation region of representative voltage-luminance character istics. The?rst signal voltage is applied to the driver of the subject pixel, and a luminance emitted by the subject pixel is measured. A second correction parameter With Which the luminance emitted by the subject pixel becomes a standard luminance is calculated. 16 Claims, 20 Drawing Sheets we,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, "a," ; panel Scanning line drive Circuit Reading of current Data [me drive drcult Storage unit Prepare circuit substrate Read corresponding-voltage $12 \ corresponding to threshold voltage of drive element Calculate?rst correction parameter offset) Store?rst correction parameter (offset) l Prepare display panel Obtain function of representative voltage-luminance characteristics Obtain predetermined signal voltage Measure and obtain luminance according to predetermined signal voltage Calculate second correction ararneter am) store second correction parameter (gain)

2 US 8,749,457 B2 Page 2 (56) References Cited FOREIGN PATENT DOCUMENTS US. PATENT DOCUMENTS JP /2006 JP /2006 7,834,825 B2 11/2010 Mizukoshi et a1. JP /2006 7,839,457 B2 11/2010 Yamagata et a1. JP /2007 7,859,492 B2 12/2010 Kohno JP /2007 7,907,137 B2 3/2011 Shirasaki et a1. JP /2007 7,982,695 B2 7/2011 Mizukoshi et a1. JP /2008 8,026,927 B2 9/2011 Daly et a1. JP /2008 8,059,070 B2 11/2011 Odawara et a1. JP / / A1 * 3/2006 Azami et a /76 WO 2005/ / / A1 10/2006 Shirasaki et a1. WO 2005/ / / A1 10/2006 Kasai WO 2006/ / / A1 12/2006 Kohno WO 2009/ / / A1 1/2007 Kohno et al. 2007/ A1 7/2007 Childs 2007/ A1 zoos/ A1 9/2007 Mizukoshietal. 10/2008 Dalyetal. U.S.Appl.N0.13/403,375t0Yasu0Segawaetal.,whlchwas?ledon 2009/ A1 10/2009 Mizukoshietal / A1* 1/2010 Ono / / A1* 10/2010 Odawara et a /690 * cited by examiner

3 US. Patent Jun. 10, 2014 Sheet 1 0f 20 US 8,749,457 B2 PRIOR ART FIG. 1 Luminance A L >( Representative ; voltage-luminance 1 characteristics L ~ I 5 A L E E L ~ ' 3 E E :::::"" r. '. Aw I VI v>voltage V1 V2 V3 V4 V5 V6

4 _ US. Patent Jun. 10, 2014 Sheet 2 0f 20 US 8,749,457 B2 _. I l il 1 / K1 _ H 586 w>cu QWQ./.-Q-FQ./.-QW---.U H 1" 1 U "i 2/. H _r mt/w7 O k. h. w FIG. 2 i2? = _ n m n. in; /, x a I _1mi:z/J?, in O _ mm Wm N.. z.. m WI. s O 5 _ " I _, _.ll _ m/ i a: by h Wm" _--T--.i _... _wu"i _ / i.7,_ 5 m _ n:." KP min e 0 _ _ Data line drive circuit Current measuring unit A rray tes t er /222 \ Communication, unit / /ZOO Storage unit /43

5 US. Patent Jun. 10, 2014 Sheet 3 0f 20 US 8,749,457 B2 FIG. 3 lg 26(Vr) / 24(Vdd) Shanna \\,/21 LCI IL I] Mergem] >> / T 25(Vss)

6 US. Patent Jun. 10, 2014 Sheet 4 0f 20 US 8,749, o?.ue v > 8:8 8:3 568% QC 35> es n _." Cam m u n 20 #62 _ m _ u H w n $55 5% : I0 / m 20 L H U 22% mmezv 10 A _ m?p_> _r " i_\.\m _.1 i_\.\_ " u n kl.\\,_ " u U n H H m J v5 NB 23 w? HS QB Sp 2956 mcecmumv M H n ED A

7 US. Patent Jun. 10, 2014 Sheet 5 0f 20 US 8,749,457 B2 FIG. 5 1_Q 24(Vdd) 2?: ~61 21 Scan{n] a j T3 Reset[n] : 27 C [/T1 r/cs T4 I»; --- T2 b 1-1/ Merge[n] > I 23 / +\ Q20 D1 25(Vss)

8 US. Patent Jun. 10, 2014 Sheet 6 0f 20 US 8,749,457 B2 FIG. 6 1_0 26(Vr) 24(Vdd) \ w- 21 / [/Tl

9 US. Patent Jun. 10, 2014 Sheet 7 0f 20 US 8,749,457 B2 FIG. 7 > Vgs

10 US. Patent Jun. 10, 2014 Sheet 8 0f 20 US 8,749,457 B2 FIG. 8 :Q 26(Vr) / 2421/ ) Scan[n] > 9 K * I Reset[n] l // 27 i /T1 C -" /C5 T4 Merge[n] > A L / T3 / D1 T2 b "51% 25(Vss)

11 US. Patent Jun. 10, 2014 Sheet 9 0f 20 US 8,749,457 B \ Prepare circuit substrate W 512 \ Read corresponding voltage ; corresponding to threshold 5 voltage of drive eiement 813 \i/ \ Store first correction parameter (offset)

12 US. Patent Jun. 10, 2014 Sheet 10 0f 20 US 8,749,457 B2 FIG. 10 Organic EL display device 40 I \ \ \ ~ \ \ I \ _ \ ~ I \ Display panel 100 \\~\\ : /41 \l { Control circuit "L42 : Control unit i I I V l l Storage unit /}/43 l 5 I I I c I l ~ ~ f\ l Correction para meter I table 43a Captured-image signal Correction parameter /50 determining device / Measurement 51/ control unit 52/ Correction parameter calculation unit

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14 US. Patent Jun. 10, 2014 Sheet120f20 US 8,749,457 B2 Iv. --Mm.mu.bw.abdmw... M 2038:2532 U COEUU< has U>XH MO p +m Mm HE: A / ma: Emu E. w>eu 5:26 W m \ HNQ mmw $th mo 6E8 E3 " _... > chiou mebm PE: : i :80 GEO d mw " Smwo i m.va " E. " n I}, 1!; M>>O\_ i 3:60 2:50 Nw \.QE NH Bmu> Edam mmmeh

15 US. Patent Jun. 10, 2014 Sheet 13 0f 20 US 8,749,457 B2 FIG. 13 (a) Representative voltage luminance characteristics Luminance A (b) Representative voltage luminance characteristics Luminance A Vth VOI Eage Voitage

16 US. Patent Jun. 10, 2014 Sheet 14 0f 20 US 8,749,457 B2 FIG. 14 (a) Luminance A For example, 7' = 2.2 Low. gradation H'gh. < Mi gradathn >Vo tage (b) LOG ; (Luminance) ' High A gradatlon

17 US. Patent Jun. 10, 2014 Sheet 15 0f 20 US 8,749,457 B2.._ Prepare display panel 522 \ Obtain function of representative voltage-luminance characteristics 524 \ V, Obtain predetermined signal voltage 525 l l \ Measure and obtain luminance according to predetermined signal voltage 526 V i \ Calculate second correction l parameter (gain) 527 i v. \ Store second correction parameter 3 (gain) \./ -

18 US. Patent Jun. 10, 2014 Sheet 16 0f 20 US 8,749,457 B2 FIG. 16 Representative voltage l- (Lum'nance) luminance characteristics A V (Voltage) FIG, 17 _ (Luminance) Representative voltage luminance characteristics Luminance ratio: a V (Voltage)

19 US. Patent Jun. 10, 2014 Sheet 17 0f 20 US 8,749,457 B2 FIG. 18 Luminance A I I l I I l I l l l I l l I I I I I l l I /K Vdata_h Vdata_hk / A Luminance Lh

20 L US. Patent Jun. 10, 2014 Sheet 18 0f 20 US 8,749,457 B2 FIG. 19 Prepare circuit substrate Read corresponding-voltage corresponding to threshold voltage of drive element Calculate first correction parameter (offset) \l/ Store first correction parameter (offset) Prepare display panel ill Obtain function of representative voltage luminance characteristics W Obtain predetermined signal voltage Measure and obtain luminance according to predetermined signal voltage \l/ Calculate second correction parameter (gain) Store second correction parameter (gain)

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