( 12 ) United States Patent
`Nakayoshi et al .
`
`( 10 ) Patent No . : US 10 , 330 , 989 B2
`( 45 ) Date of Patent :
`Jun . 25 , 2019
`
`US010330989B2
`
`( 54 ) LIQUID CRYSTAL DISPLAY DEVICE ,
`DISPLAY DEVICE AND MANUFACTURING
`METHOD THEREOF
`( 71 ) Applicants : Japan Display Inc . , Tokyo ( JP ) ;
`Panasonic Liquid Crystal Display Co . ,
`Ltd . , Hyogo - ken ( JP )
`( 72 ) Inventors : Yoshiaki Nakayoshi , Ooamishirasato
`( JP ) ; Kazuhiko Yanagawa , Mobara
`( JP )
`( 73 ) Assignees : JAPAN DISPLAY INC . , Tokyo ( JP ) ;
`PANASONIC LIQUID CRYSTAL
`DISPLAY CO . , LTD . , Hyogo - Ken ( JP )
`Subject to any disclaimer , the term of this
`patent is extended or adjusted under 35
`U . S . C . 154 ( b ) by 300 days .
`( 21 ) Appl . No . : 15 / 271 , 422
`( 22 ) Filed :
`Sep . 21 , 2016
`( 65 )
`Prior Publication Data
`US 2017 / 0010509 A1 Jan . 12 , 2017
`
`( * ) Notice :
`
`Related U . S . Application Data
`( 60 ) Continuation of application No . 14 / 942 , 120 , filed on
`Nov . 16 , 2015 , now Pat . No . 9 , 488 , 880 , which is a
`( Continued )
`Foreign Application Priority Data
`( 30 )
`Oct . 15 , 2001 ( JP ) . . . . .
`. . . . . . . . . . . . 2001 - 317149
`( 51 )
`Int . CI .
`GO2F 1 / 13
`GO2F 1 / 1333
`
`( 2006 . 01 )
`( 2006 . 01 )
`( Continued )
`
`JP
`
`( 56 )
`
`( 52 ) U . S . CI .
`CPC . . . . . . GO2F 1 / 134309 ( 2013 . 01 ) ; G02F 1 / 1343
`( 2013 . 01 ) ; G02F 1 / 1368 ( 2013 . 01 ) ;
`( Continued )
`( 58 ) Field of Classification Search
`CPC . . . . . . . . . GO2F 1 / 134309 ; GO2F 1 / 133345 ; GO2F
`1 / 1343
`See application file for complete search history .
`References Cited
`U . S . PATENT DOCUMENTS
`5 , 060 , 036 A
`10 / 1991 Choi
`5 , 185 , 601 A
`2 / 1993 Takeda et al .
`( Continued )
`FOREIGN PATENT DOCUMENTS
`1242854 A
`3 / 1999
`9
`2000 - 08408
`/ 1998
`( Continued )
`OTHER PUBLICATIONS
`JPO Office Action dated Apr . 8 , 2018 , in Japanese .
`Chinese Office Action dated May 9 , 2008 regarding Chinese Patent
`Application No . 2007100057283 , in Chinese .
`Primary Examiner — Lucy P Chien
`( 74 ) Attorney , Agent , or Firm — Juan Carlos A . Marquez ;
`Marquez IP Law Office , PLLC
`ABSTRACT
`( 57 )
`Image display device having an electrode forming layer
`which includes a plurality of gate lines , a plurality of drain
`lines , a plurality of switching elements and the a plurality of
`pixel electrodes , and having reference electrode layer
`between the electrode forming layer and a substrate where
`the electrode forming layer formed thereon , and the refer
`ence electrode layer and the electrode forming layer are
`insulated by insulating layer .
`2 Claims , 63 Drawing Sheets
`
`PX
`
`C? H
`
`DL
`
`7PAS
`GI
`70 - PAS
`ST
`
`SUB1
`
`TED
`
`Page 1 of 91
`
`Tianma Exhibit 1001
`
`

`

`US 10 , 330 , 989 B2
`Page 2
`
`Related U . S . Application Data
`continuation of application No . 14 / 708 , 348 , filed on
`May 11 , 2015 , now Pat . No . 9 , 213 , 204 , which is a
`continuation of application No . 14 / 285 , 006 , filed on
`May 22 , 2014 , now Pat . No . 9 , 086 , 600 , which is a
`continuation of application No . 13 / 927 , 539 , filed on
`Jun . 26 , 2013 , now Pat . No . 8 , 760 , 609 , which is a
`continuation of application No . 13 / 650 , 203 , filed on
`Oct . 12 , 2012 , now Pat . No . 8 , 493 , 522 , which is a
`continuation of application No . 13 / 364 , 092 , filed on
`Feb . 1 , 2012 , now Pat . No . 8 , 310 , 641 , which is a
`continuation of application No . 12 / 926 , 735 , filed on
`Dec . 7 , 2010 , now Pat . No . 8 , 248 , 549 , which is a
`continuation of application No . 12 / 292 , 728 , filed on
`Nov . 25 , 2008 , now Pat . No . 7 , 872 , 696 , which is a
`division of application No . 11 / 976 , 884 , filed on Oct .
`29 , 2007 , now Pat . No . 7 , 605 , 876 , which is a division
`of application No . 11 / 409 , 076 , filed on Apr . 24 , 2006 ,
`now Pat . No . 7 , 307 , 673 , which is a division of
`application No . 11 / 211 , 574 , filed on Aug . 26 , 2005 ,
`now Pat . No . 7 , 423 , 701 , which is a division of
`application No . 10 / 237 , 911 , filed on Sep . 10 , 2002 ,
`now Pat . No . 6 , 970 , 222 .
`Int . Ci .
`GO2F 1 / 1343
`( 2006 . 01 )
`( 2006 . 01 )
`GO2F 1 / 1362
`GO2F 1 / 1368
`( 2006 . 01 )
`( 52 ) U . S . CI .
`CPC . . . GO2F 1 / 13439 ( 2013 . 01 ) ; GO2F 1 / 133345
`( 2013 . 01 ) ; GO2F 1 / 136213 ( 2013 . 01 ) ; GOLF
`1 / 136286 ( 2013 . 01 ) ; G02F 1 / 13 ( 2013 . 01 ) ;
`GO2F 2201 / 123 ( 2013 . 01 ) ; G02F 2201 / 40
`( 2013 . 01 )
`
`( 51 )
`
`( 56 )
`
`References Cited
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`9 / 1997 Ono et al .
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`* 12 / 1999 Lyu . . . . . . . . . . . . . . . . . . . . HO1L 27 / 1214
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`. GO2F 1 / 134363
`349 / 141
`
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`349 / 43
`2002 / 0041354 Al
`4 / 2002 Noh et al .
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`5 / 2005 Ono et al .
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`
`I
`
`FOREIGN PATENT DOCUMENTS
`3591513
`4 / 2001
`2001 - 228493
`8 / 2001
`* cited by examiner
`
`Page 2 of 91
`
`

`

`U . S . Patent
`
`atent
`
`Jun . 25 , 2019
`
`Sheet 1 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 1
`
`te
`
`WHOITU
`
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`
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`
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`
`Page 3 of 91
`
`

`

`U . S . Patent
`
`atent
`
`Jun . 25 , 2019
`
`Sheet 2 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 2
`
`SUB2 BM
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`Page 4 of 91
`
`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 3 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 4
`
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`
`Page 5 of 91
`
`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 4 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 5
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`
`Page 6 of 91
`
`

`

`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 5 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 9
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`w
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`Page 7 of 91
`
`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 6 of 63
`
`US 10 , 330 , 989 B2
`
`FIG , 8
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`Page 8 of 91
`
`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 7 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 10
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`Page 9 of 91
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`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 8 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 11
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`Page 10 of 91
`
`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 9 of 63
`
`US 10 , 330 , 989 B2
`
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`
`Page 11 of 91
`
`

`

`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 10 of 63
`
`US 10 , 330 , 989 B2
`
`SUB2
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`Page 12 of 91
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`

`

`nt
`
`Jun . 25 , 2019
`
`Sheet 11 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 15
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`Page 13 of 91
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`

`

`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 12 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 16
`
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`
`Page 14 of 91
`
`

`

`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 13 of 63
`
`US 10 , 330 , 989 B2
`
`SUB2
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`Page 15 of 91
`
`

`

`atent
`
`Jun . 25 , 2019
`
`Sheet 14 of 63
`
`US 10 , 330 , 989 B2
`
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`Page 16 of 91
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`

`

`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 15 of 63
`
`US 10 , 330 , 989 B2
`
`FIG , 21
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`Page 17 of 91
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`

`atent
`
`Jun . 25 , 2019
`
`Sheet 16 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 24
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`Page 18 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 17 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 2
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`Page 19 of 91
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`atent
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`Jun . 25 , 2019
`
`Sheet 18 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 28
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`Page 20 of 91
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`

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`atent
`
`Jun . 25 , 2019
`
`Sheet 19 of 63
`
`US 10 , 330 , 989 B2
`
`LC
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`
`Page 21 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 20 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 31
`
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`Page 22 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 21 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 32
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`Page 23 of 91
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`nt
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`Jun . 25 , 2019
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`Sheet 22 of 63
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`US 10 , 330 , 989 B2
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`FIG . 34
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`Page 24 of 91
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`nt
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`Jun . 25 , 2019
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`Sheet 23 of 63
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`US 10 , 330 , 989 B2
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`FIG . 35
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`Page 25 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 24 of 63
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`US 10 , 330 , 989 B2
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`FIG . 38
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`Page 26 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 25 of 63
`
`US 10 , 330 , 989 B2
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`FIG . 39
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`Page 27 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 26 of 63
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`US 10 , 330 , 989 B2
`
`FIG , 42
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`Page 28 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 27 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 43
`TED TP ML
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`Page 29 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 28 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 46A
`THIS
`ML TED
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`
`Page 30 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 29 of 63
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`US 10 , 330 , 989 B2
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`FIG . 47
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`Page 31 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 30 of 63
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`US 10 , 330 , 989 B2
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`FIG . 48
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`
`Page 32 of 91
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`U . S . Patent
`
`atent
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`Jun . 25 , 2019
`
`Sheet 31 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 51
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`Page 33 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 32 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 52
`DL
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`Page 34 of 91
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`nt
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`Jun . 25 , 2019
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`Sheet 33 of 63
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`US 10 , 330 , 989 B2
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`FIG . 54
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`
`Page 35 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 34 of 63
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`US 10 , 330 , 989 B2
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`????
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`FIG . 56
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`Page 36 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 35 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 57
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`Page 37 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 36 of 63
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`US 10 , 330 , 989 B2
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`FIG . 58
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`Page 38 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 37 of 63
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`US 10 , 330 , 989 B2
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`FIG . 60
`
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`Page 39 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 38 of 63
`
`US 10 , 330 , 989 B2
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`FIG . 61
`PX spt
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`Page 40 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 39 of 63
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`US 10 , 330 , 989 B2
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`TH
`FIG , 6 3
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`FIG . 64
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`Page 41 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 40 of 63
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`US 10 , 330 , 989 B2
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`FIG . 65
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`Page 42 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 41 of 63
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`US 10 , 330 , 989 B2
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`FIG . 66
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`FIG . 67
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`Page 43 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 42 of 63
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`US 10 , 330 , 989 B2
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`FIG . 68
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`Page 44 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 43 of 63
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`US 10 , 330 , 989 B2
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`FIG . 69
`PX SD1
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`Page 45 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 44 of 63
`
`US 10 , 330 , 989 B2
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`FIG . 71
`
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`TFT
`
`Page 46 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 45 of 63
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`US 10 , 330 , 989 B2
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`FIG . 72
`
`PX
`
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`FIG . 73
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`
`Page 47 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 46 of 63
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`US 10 , 330 , 989 B2
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`FIG . 74
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`XIII
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`Page 48 of 91
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`atent now
`
`US 10 , 330 , 989 B2
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`Jun . 25 , 2019
`
`Sheet 47 of 63
`
`FIG . 75
`TH
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`
`Page 49 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 48 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 77
`
`PX
`
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`
`FIG . 78
`TH
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`
`Page 50 of 91
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`atent
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`Jun . 25 , 2019
`
`Sheet 49 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 79
`TH
`GT
`
`PX
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`FIG . 80
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`TMG
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`
`Page 51 of 91
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`new - - - -
`
`atent
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`Jun . 25 , 2019
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`Sheet 50 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 81
`TOP
`CH2
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`CH
`
`Page 52 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 51 of 63
`
`US 10 , 330 , 989 B2
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`FIG . 83
`TMO
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`IMG
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`FIG , 84
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`SUB2
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`
`Page 53 of 91
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`U . S . Patent
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`Jun . 25 , 2019
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`Sheet 52 of 63
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`US 10 , 330 , 989 B2
`
`SL
`
`GL
`
`FIG . 85A CH1 LE
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`SUB1
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`IN AN
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`SUB1 ó SUB2
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`Page 54 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
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`Sheet 53 of 63
`
`US 10 , 330 , 989 B2
`
`M
`
`FIG , 86A CH14
`
`SUBI
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`
`FIG . 86B CHH
`
`SUB1 / SUB2
`
`Page 55 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 54 of 63
`
`US 10 , 330 , 989 B2
`
`FIG , 87A
`
`Stihi FPC
`GDL
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`Page 56 of 91
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`nt
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`Jun . 25 , 2019
`
`Sheet 55 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 88
`
`TMD
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`SL
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`FIG . 89
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`Page 57 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 56 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 90
`
`SUB2
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`AG
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`FIG . 91
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`SUB2
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`
`FIG . 92
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`SUB1
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`Page 58 of 91
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`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 57 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 93
`STT
`
`STT
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`SUB1
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`Page 59 of 91
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`atent
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`Jun . 25 , 2019
`
`Sheet 58 of 63
`
`US 10 , 330 , 989 B2
`
`FIG , 96
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`SUB1
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`SUB1
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`SUBI
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`Page 60 of 91
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`atent
`
`Jun . 25 , 2019
`
`Sheet 59 of 63
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`US 10 , 330 , 989 B2
`
`FIG . 98
`. . . LCN OPAS
`
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`Page 61 of 91
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`

`U . S . Patent
`
`Jun . 25 , 2019
`
`Sheet 60 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 101
`
`SUB2
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`FIG . 103
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`Page 62 of 91
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`atent
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`Jun . 25 , 2019
`
`Sheet 61 of 63
`
`US 10 , 330 , 989 B2
`
`FIG . 104
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`SUB2
`SUB1
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`FIG . 105
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`Page 63 of 91
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`atent
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`Jun . 25 , 2019
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`Sheet 62 of 63
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`US 10 , 330 , 989 B2
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`Page 64 of 91
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`U . S . Patent
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`Jun . 25 , 2019
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`Sheet 63 of 63
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`US 10 , 330 , 989 B2
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`FIG . 110
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`US 10 , 330 , 989 B2
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`5
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`LIQUID CRYSTAL DISPLAY DEVICE ,
`DISPLAY DEVICE AND MANUFACTURING
`METHOD THEREOF
`
`As another system , there exists a so - called IPS system in
`which counter electrodes which correspond to the common
`electrodes are formed on the above - mentioned first substrate
`side . Also with respect to this system , there has been known
`CROSS - REFERENCE TO RELATED
`a system which forms color filters on either the first substrate
`side or the second substrate side .
`APPLICATION
`The vertical field type liquid crystal display device
`includes a plurality of gate lines which extend in the first
`This application is a Continuation of U . S . application Ser .
`direction ( usually horizontal scanning direction ) and are
`No . 14 / 942 , 120 filed Nov . 16 , 2015 , which is a Continuation
`of U . S . application Ser . No . 14 / 708 . 348 filed May 11 , 2015 . 10 arranged parallel to each other and a plurality of drain lines
`which extend in the second direction which crosses the gate
`which is a Continuation of U . S . application Ser . No . 14 / 285 ,
`lines ( usually vertical scanning direction ) and are arranged
`006 filed May 22 , 2014 , which is a Continuation of U . S .
`parallel to each other . The liquid crystal display device
`application Ser . No . 13 / 927 , 539 filed Jun . 26 , 2013 , which is
`further includes switching elements such as thin film tran
`a Continuation of U . S . application Ser . No . 13 / 650 , 203 filed 15 sistors or the like in the vicinity of respective crossing
`Oct . 12 , 2012 , which is a Continuation of U . S . application
`portions of the gate lines and drain lines and pixel electrodes
`Ser . No . 13 / 364 , 092 filed Feb . 1 , 2012 , which is a Continu
`which are driven by the switching elements .
`ation of U . S . application Ser . No . 12 / 926 , 735 filed Dec . 7 ,
`In this vertical field type liquid crystal display device , the
`common electrodes are formed on the second substrate such
`2010 , which is a Continuation of U . S . application Ser . No .
`12 / 292 , 728 filed Nov . 25 , 2008 , which is a Divisional of 20 that the common electrodes face the pixel electrodes in an
`U . S . application Ser . No . 11 / 976 , 884 filed Oct . 29 , 2007 ,
`opposed manner , an electric field is generated between the
`which is a Divisional of U . S . application Ser . No . 11 / 409 ,
`common electrodes and the selected pixel electrodes in the
`076 filed Apr . 24 , 2006 , which is a Divisional of U . S .
`direction which approximately crosses a surface of the
`application Ser . No . 11 / 211 , 574 filed Aug . 26 , 2005 , which
`substrate at a right angle , and lighting of the pixels is
`is a Divisional of U . S . application Ser . No . 10 / 237 , 911 filed 25 performed by changing the orientation of liquid crystal
`Sep . 10 , 2002 . Priority is claimed based on U . S . application
`molecules sandwiched between the pixel electrode and the
`Ser . No . 14 / 708 , 348 filed May 11 , 2015 , which claims
`common electrodes .
`priority of U . S . application Ser . No . 14 / 285 , 006 filed May
`On the other hand , in the IPS type liquid crystal display
`22 , 2014 , which claims priority of U . S . application Ser . No .
`device , gate lines , drain lines , and switching elements simi
`13 / 927 , 539 filed Jun . 26 , 2013 , which claims priority of U . S . 30 lar to those of the vertical field type liquid crystal display
`application Ser . No . 13 / 650 , 203 filed Oct . 12 , 2012 , which
`device are formed on an inner surface of the above - men
`claims priority of U . S . application Ser . No . 13 / 364 , 092 filed
`tioned first substrate , comb - shaped pixel electrodes are
`Feb . 1 , 2012 , which claims priority of U . S . application Ser .
`formed on the same substrate , and counter electrodes are
`No . 12 / 926 , 735 filed Dec . 7 , 2010 , which claims priority of
`formed close to the pixel electrodes on the same substrate .
`U . S . application Ser . No . 12 / 292 , 728 filed Nov . 25 , 2008 , 35 Then , an electric field is generated between the selected
`which claims priority of U . S . application Ser . No . 11 / 976 ,
`pixel electrodes and the counter electrodes in the direction
`884 filed Oct . 29 , 2007 , which claims priority of U . S .
`approximately parallel to a surface of the substrate , and
`application Ser . No . 11 / 409 , 076 filed on Apr . 24 , 2006 ,
`lighting of the pixels is performed by changing the orien
`which claims priority to U . S . application Ser . No . 11 / 211 ,
`tation direction of liquid crystal molecules arranged between
`574 filed Aug . 26 , 2005 , which claims priority to U . S . 40 the pixel electrodes and the counter electrodes . As a liquid
`application Ser . No . 10 / 237 , 911 filed Sep . 10 , 2002 , which
`crystal display device which has developed this type , there
`claims priority to Japanese Patent Application No . 2001
`exists a liquid crystal display device which adopts a matted
`317147 filed on Oct . 15 , 2001 , and which is hereby incor
`electrode as the counter electrodes and forms comb - shaped
`pixel electrodes as a layer above or below the counter
`porated by reference .
`45 electrodes .
`BACKGROUND OF THE INVENTION
`In both of the above - mentioned type liquid crystal display
`devices , the charge storing capacity for holding the lighting
`1 . Field of the Invention
`time of the pixels which are lit due to selection at a given
`value ( hereinafter , simply referred to as " holding capacity ” )
`The present invention relates to a liquid crystal display
`device , and more particularly to an active matrix type liquid 50 is formed in regions where the pixel electrodes and the gate
`crystal display device which can reduce holding capacity for
`lines are overlapped or regions where other electrode lines
`holding lighting of pixels for a given time and feeding
`which are formed such that the other electrode lines trans
`resistance thereof thus enhancing numerical aperture .
`verse the pixel electrode forming region and the pixel
`2 . Description of the Related Art
`electrodes , and feeding paths for storing charge in the
`An active matrix type liquid crystal display device gen - 55 holding capacity is formed of either the gate lines or the
`erally adopts a system in which liquid crystal is sandwiched
`above - mentioned electrode lines .
`between a pair of substrates which face each other in an
`opposed manner and pixels are selected by pixel electrodes
`SUMMARY OF INVENTION
`which are driven by a large number of switching elements
`represented by thin film transistors formed on one of the 60
`In this manner , one electrode which forms the holding
`above - mentioned pair of substrates . One type of the liquid
`capacity is a linear electrode and the feeding is limited to one
`crystal display device adopting such a system is a so - called
`direction ( extending direction of the electrode ) and hence ,
`vertical field type in which on the other substrate ( second
`the feeding resistance is large . Further , corresponding to the
`substrate ) which faces one substrate ( first substrate ) of the
`increase of the distance between the electrode and a feeding
`above - mentioned pair of substrates , color filters and com - 65 end , the voltage drop is remarkably increased so that there
`mon electrodes are formed or the color filters are also
`arises a case that the required charge cannot be fed . Further ,
`since the above - mentioned gate line usually crosses the
`formed on the first substrate .
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`US 10 , 330 , 989 B2
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`Due to such a constitution , the feeding resistance with
`drain line , a crossing capacity is increased . As a result , this
`respect to the storage capacity is largely reduced so that it is
`has been one of causes which make the rapid driving of
`possible to realize the liquid crystal display device which
`liquid crystal display device difficult . As a countermeasure
`can realize both of the enhancement of numerical aperture of
`to cope with such a problem , there has been proposed a
`liquid crystal display device which uses the above - men - 5 pixels and the assurance of holding capacity .
`tioned other electrode line . However , when the holding
`( 2 ) :
`capacity is formed in the pixel electrode forming region ,
`In the constitution ( 1 ) , the electrode forming layer
`includes the gate lines , a gate insulation layer , the semicon
`numerical aperture is reduced as a matter of course .
`Further , along with the demand for high definition , the
`ductor layers , the drain lines , a passivation layer and the
`size of pixels per one pixel is reduced so that there has been " pixel electrodes in this order over the first insulation layer ,
`a task that it is difficult to form the sufficient holding
`and the holding capacity of the pixel is formed between the
`capacity .
`pixel electrodes and the reference electrode layer .
`Further , although it is effective to reduce the size of the
`Since the holding capacity is constituted of the passiva
`holding capacity to enhance the numerical aperture , this 15 tion layer , the gate insulation layer and the first insulation
`brings about the reduction of the holding capacity . That is ,
`layer which are formed between the pixel electrode and the
`there has been a task that there exists a trade - off relationship
`reference electrode layer , the distance to the reference elec
`between the enhancement of numerical aperture and the
`trode layer as viewed from the liquid crystal layer can be
`largely increased so that the influence of the electric field of
`assurance of holding capacity .
`Accordingly , it is an object of the present invention to 20 the reference electrode layer on the electric field for driving
`liquid crystal can be attenuated .
`provide an active matrix liquid crystal