17 Claims, 19 Drawing Sheets EG4 SD4 {8L4 ( I; DLI Q P A. \! v,zcll. RG1 7 / l. a U ' 14 A I 1) ~ $ _. _. _. T. _. _. _. /,.

Transcription

1 US B2 (12) United States Patent Nakanishi et a]. (10) Patent N0.: (45) Date of Patent: US 8,564,751 B2 Oct. 22, 2013 (54) (75) (73) ( * ) (21) (22) (86) (87) (65) (30) Apr. 17, 2009 (JP) (51) Int. Cl. G02F 1/1337 ( ) (52) US. Cl. USPC /129; 349/130 (58) Field of Classi?cation Search (56) LIQUID CRYSTAL DISPLAY DEVICE Inventors: Yohei Nakanishi, Osaka (JP); Masanobu Mizusaki, Osaka (JP); Takashi Katayama, Osaka (JP); Yuichi KaWahira, Osaka (JP) Assignee: Sharp Kabushiki Kaisha, Osaka (JP) Notice: Appl. No.: PCT Filed: PCT No.: 371 (0X1) (2), (4) Date: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 106 days. 13/264,801 Apr. 12, 2010 PCT/JP2010/ Oct. 17, 2011 PCT Pub. No.: WO2010/ PCT Pub. Date: Oct. 21, 2010 Prior Publication Data US 2012/ A1 Feb. 9, 2012 Foreign Application Priority Data USPC /l29il30 See application?le for complete search history. References Cited U.S. PATENT DOCUMENTS 6,369,870 Bl* 4/2002 Koma /130 6,567,144 B1 5/2003 Kim degrees (Continued) FOREIGN PATENT DOCUMENTS JP l/l996 JP lo/l997 (Continued) OTHER PUBLICATIONS International Preliminary Report on Patentability mailed Nov. 24, 2011 in corresponding PCT Application No. PCT/JP20l0/ (Continued) Primary Examiner * James Dudek (74) Attorney, Agent, or Firm * Nixon & Vanderhye PC. (57) ABSTRACT A VA-mode liquid crystal display device having a high dis play quality is provided. A liquid crystal display device according to the present invention includes a vertical align ment type liquid crystal layer; a?rst substrate and a second substrate facing each other with the liquid crystal layer inter posed therebetween; a?rst electrode provided in the?rst substrate on the liquid crystal layer side and a second elec trode provided in the second substrate on the liquid crystal layer side; and a?rst alignment?lm provided between the?rst electrode and the liquid crystal layer and a second align ment?lm provided between the second electrode and the liquid crystal layer. The liquid crystal display device includes a plurality of pixel areas located in a matrix. Each of the plurality of pixel areas includes a?rst liquid crystal domain in which a tilt direction of liquid crystal molecules at the center and in the vicinity thereof in a layer plane and in a thickness direction of the liquid crystal layer when a voltage is applied between the?rst electrode and the second electrode is a predetermined?rst direction, a second liquid crystal domain in which such a tilt direction is a predetermined second direc tion, a third liquid crystal domain in which such a tilt direction is predetermined third direction and a fourth liquid crystal domain in which such a tilt direction is a predetermined fourth direction; a difference between any two among the?rst direc tion, the second direction, the third direction and the fourth direction is approximately equal to an integral multiple of 90 EG4 SD4 {8L4 ( I; DLI Q P A \! v,zcll el I RG1 7 / l a U ' 14 \ _ A I 1) ~ $ Claims, 19 Drawing Sheets l0.. _. _. _. T. _. _. _. /,. _ B C 63 > / sr>1~?2\, l 13 A N Fm ;! T \' DL3 K / $132

2 US 8,564,751 B2 Page 2 (56) References Cited JP /2004 JP /2005 U.S. PATENT DOCUMENTS JP /2006 JP /2008 6,583,835 B1 6/2003 Yoshida et al. 7,113,241 B2 9/2006 Hanaoka OTHER PUBLICATIONS 7,136,140 B1 11/2006 Inoue et al. 2004/ Al 6/2004 Takeda et 31. International Search Report for PCT/ JP2010/ mailed May 25, 2005/ A1 9/2005 Nakanishi 2010, 2006/ A1 6/2006 Ando et a Al Inoue et al International Preliminary Report on Patentability mailed Nov. 24, 2011 in PCT Application No. PCT/JP2010/ FOREIGN PATENT DOCUMENTS International Search Report for PCT/JP2010/ , mailed May 25, JP /1999 Of?ce Action issued in US. Appl. No. 13/264, 851 datedapr. 4, JP /2001 JP /2002 * cited by examiner

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4 US. Patent 0a. 22, 2013 Sheet 2 0f 19 US 8,564,751 B2 FIG. 3 PA1 A TFT SUBSTRATE V? &\ PM EU OF SUBSTRATE SIDE P51 (b) / LTQUID CRYSTAL LAYER DL4 (10 MR X Mm?) I g.

5 US. Patent 0a. 22, 2013 Sheet 3 0f 19 US 8,564,751 B2 FIG. 4 TFT SUBSTRATE SIDE (9). PAT Avg \/ RA2 CF SUBSTRATE SIDE (b) P82 LIQUID CRYSTAL LAYER,20 DLS (c) ( - l fl C T k B L,VDL2 DU

6 US. Patent 0a. 22, 2013 Sheet 4 0f 19 US 8,564,751 B2 FIG. 5 PA1/\ \/G TFT SUBSTRATE SIDE U g\ PAZ U 1} CF SUBSTRATE SlDE P81 / L LIQUID CRYSTAL LAYER DL4<H> ( I I g30 2 2V DL2(V) L, DL2 DL2(H)

7 US. Patent 0a. 22, 2013 Sheet 5 0f 19 US 8,564,751 B2 FIG. 6 TFT SUBSTRATE SIDE {} CF SUBSTRATE SIDE (b) P51 P82 {r~\ \ -'/ 4O LIQUID CRYSTAL LAYER DL3(H) ; ( A T c I QR I 3 3 DL1 DL1(H) VDLS wlmaw)

8 US. Patent 0a. 22, 2013 Sheet 6 0f 19 US 8,564,751 B2 FIG. 7 RELATIVE TRANSMTTTANCE (FRONTAL DIRECTION) EGI R2 FIGS // / 3 a

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10 U S. Patent Oct. 22, 2013 Sheet 8 0f 19 US 8,564,751 B2 FIG 1] (FRONTAL OIREcTION) / l. RELATIVE TRANsNIITTANOE 24b FIG, 12 RELATIVE TRANSMITTANCE (FRONTAL OIREOTION) / IT III 1 i I Q! 7! r 24 H 24a.r I

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12 US. Patent 0a. 22, 2013 Sheet 10 0f 19 US 8,564,751 B2 FIGZ5 RELATIVE TRANSMITTANCE (FRONTAL DIRECTION) I X RELATIVE TRANSMITTANCE (FRONTAL DIRECTION)

13 US. Patent 0a. 22, 2013 Sheet US 8,564,751 B2 24 Biz i4 /////// 240 /i Sum? WWW, H}, 1a

14 US. Patent 0a. 22, 2013 Sheet 12 0f 19 US 8,564,751 B2 F o E 1.1 * D 1.05 RIB WIDTH w I: (I! m) a : LLI I '*'" IO 5 \- 25 E LIQUID CRYSTAL LAYER ' 30 THICKNESS d= m I I I RIB HEIGHT h ( u m) FIGZO RIB HEIGHTII (I1 m) TRANSMITTANCE RATIO T/TO LIQUID CRYSTAL LAYER THICKNESS d= m 0.8 I I IO 15 2O 25 3O RIB WIDTH W( L1 m)

15 , I - US. Patent 0a. 22, 2013 Sheet 13 0f 19 US 8,564,751 B2 FIG. 2] 4: O 4' 21: O. I I. I: Alum UC mm CE RS YS gd A?w L2 MM Y m RIB WIDTH w (11m) ~? RIB HEIGHT hiu m) 3.5 F] G. 22 I15 RlB HEIGHTII (11m) 0 O 1. on 9. O 95 I LT MW UC mm CE RS YS I Add Ana L2 MM Y m m 0.8 1O 15 RIB WIDTH WI 11 m)

16 US. Patent 0a. 22, 2013 Sheet 14 0f 19 US 8,564,751 B2 FY6123

17 US. Patent 0a. 22, 2013 Sheet 15 0f 19 US 8,564,751 B2 FIG. 25

18 US. Patent 0a. 22, 2013 Sheet 16 0f 19 US 8,564,751 B2

19 US. Patent 0a. 22, 2013 Sheet 17 0f 19 US 8,564,751 B2 FIG, 29

20 US. Patent 0a. 22, 2013 Sheet 18 0f 19 US 8,564,751 B2 FIG. 31 FIG. 32

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