(12) United States Patent
`Kamizono et al.
`
`(10) I'alent No.:
`(45) I)ate of I'atcnt:
`
`US 6,407,795 BI
`.Jun. 18, 2002
`
`11111111111111
`
`(54) L1Qum CRYSTAL DISPLAY AND ITS
`INSI'ECTING METHOIl
`
`(75)
`
`]uvt,;[JlOrs: Tosh ihiko Kamizono, KagusiLillla;
`Hirosh i Kinoshita ; Ts uyoshi Ishigmu(',
`both o f Ishikawa, all of (Jp)
`
`(73) Assignee: MalSushita Elcctlic lndustrial Co.,
`Ltd., Osaka (JP)
`
`( . ) Notice;
`
`Subjccllo any (Iisda imcr, the \cnn of Ihis
`patenl is extended or adjusted under 35
`U.S.c. 154(b) by 0 days.
`
`(21) App!. No.:
`
`09/914,919
`
`(22) PeT Elcd-
`
`Mar. 7, 2000
`
`(Ro) 1'(1 No'
`
`~liJl''O()!fI1362
`
`§ "71 (e)( I),
`(2). (4) Date: Nov. 19,200 1
`(87) pe r Pub. No.: WOQO{S4098
`pc r Pub. Dale: Scpo 14,2000
`
`(30)
`
`Fureign Application '>riority Data
`
`Mar. 8, 1998
`
`(JI»
`
`11-060064
`
`GOlF 1/1333
`Int. C I.' .
`(51)
`(52) U.S. <.:I •....................... 349/ 149; 349/150; 349/15 1;
`349{152
`(58) Field uf Search ................................. 349/149, 150 ,
`349/151,152
`
`(56)
`
`Rl'fl'nonCt."S C iIL'<I
`
`U.S. PATENT DOCUMENTS
`
`6,266, 119 8 1 · 7{1001 Takahashi ct al. .......... 349.1149
`
`FOREIGN PArENT DOCUMI:NTS
`
`w
`W
`JP
`JP
`JP
`JP
`JP
`W
`JP
`
`62· 10622
`62·36571
`4·793)3
`'·29030
`5-241178
`6-SQ269
`8-36189
`10-74550
`10-96949
`
`1/ 1987
`3/1987
`7/1991-
`4/ 1993
`9/ 1993
`3/ I()I)4
`2M%
`3/1998
`4/ 1998
`
`~ cited by examiner
`
`Primary EX(lflliner-James Dudek
`(74) Auorlley, IIgent, or Firm- Wenderoth, lind & Ponack,
`L.L.P.
`
`(57)
`
`ABSTRAc r
`
`A liquid crystal panel ( 1) includes plural signal lines and
`scann ing lines disposed in matrix, and liquid-crystal-driving
`LSIs (5. 6) having input and output por1io ns directly con(cid:173)
`nected by thennocompression bonding with an anisolropi(cid:173)
`cally couductive adhesive (9). ·l1le LSls are mounted on a
`conductor on a rinl of Ihe paoe!. Film jumper boards ( LU,
`14), the respective numbers of which correspond to the
`number of Ill.! driving LSls (5. 6), connects betweeo a
`terminal conductor (2 1) at the rim of the liquid crystal panel
`(1) and circuit boards (12. 16). As a result, a liquid crystal
`display which Can be designcd free ly. can be modified easily,
`can employs commOll components, and can have a defective
`driving LSI specified and repa ired readily and accurately is
`provided. A method of inspectillg the display is abo pro(cid:173)
`vided .
`
`6,198,5 19 B1 . 3,2001 Chang
`
`................. 349/129
`
`1.3 C illims,. 16 nrMwing ShL-el<;
`
`17
`
`19
`
`13
`
`18
`
`" FX
`
`21
`
`16
`
`SHARP EXHIBIT 1004
`Page 1 of 25
`
`

`

`U.S. Patent
`US. Patent
`
`Jun. 18, 2002
`Jun. 18,2002
`
`Sheet 1 01' 16
`Sheet 1 of 16
`
`US 6,407,795 BI
`US 6,407,795 B1
`
`FIG. 1
`FIG. 1
`
`17
`
`
`
`
`
` IE
`18
`
`1 4 ---1---.;11<:2
`FX
`
`
`
`
`
`
`16
`
`1
`
`Page 2 of 25
`Page 2 of 25
`
`

`

`U.S. Patent
`
`Jun. 18, 2002
`
`Sheet 2 of 16
`
`US 6,407,795 Bi
`
`FIG.2A
`
`206
`
`P.
`
`20~01
`
`n·1
`
`--
`
`p not
`
`11-11--11-11-111-11-111-11-
`
`220
`
`F
`
`FIG.2B
`
`206
`
`r----;"<-, n+1 II
`
`p
`
`-----~. 0"' __
`208
`LJ
`
`p~
`208 ------tJ 0
`pI
`
`218
`
`220
`
`219
`
`II-II-I~'II-II-II-II-II--------' 1~11iI~11>1~1~
`
`F
`
`Page 3 of 25
`
`

`

`U.S. Patent
`
`.Iun.18,2002
`
`Sheet 3 or 16
`
`US 6,407,795 Bl
`
`FIG.3A
`
`218 --Girmnn-I~~
`
`220
`
`219
`
`a
`
`FIG. 38
`
`,-
`218
`
`220
`
`219
`
`,.....1
`
`-
`
`I
`
`#
`I I
`1
`
`T
`\
`
`nl '\
`:--
`
`................ ~
`• • • • ••••••••••••••••••
`
`-----------
`
`------~ . i
`\
`~J
`)
`'--n2
`
`F
`
`F
`
`Page 4 of 25
`
`

`

`U.S. Patent
`US. Patent
`
`Jun. 18, 2002
`Jun. 18, 2002
`
`Sheet 4 0f 16
`Sheet 4 01' 16
`
`US 6,407,795 BI
`US 6,407,795 Bl
`
`FIG. 4
`
`206
`
`
`
`__ -9
`
`Willa
`
`20
`
`F
`
`202
`
`U
`
`21-~
`21
`
`Page 5 of 25
`Page 5 of 25
`
`

`

`U.S. Patent
`US. Patent
`
`Jun. 18,2002
`Jun. 18, 2002
`
`Sheet 5 of 16
`Sheet 5 0f 16
`
`US 6,407,795 Bl
`Us 6,407,795 B1
`
`FIG. 5
`
`c
`
`13 ~'r;::::~
`
`22
`
`
`
`18
`
`o
`
`Page 6 of 25
`Page 6 of 25
`
`

`

`U.S. Patent
`
`.Jun. 18, 2002
`
`Sheet ~ of 16
`
`US 6,407,795 BI
`
`230
`
`FIG.6A
`
`I
`
`Ie
`
`..
`
`230
`
`----
`
`I
`
`w
`
`-
`-}p
`:e ~I
`t-- -----------------------0-------------
`j
`}I
`1..1':
`-
`218 230
`
`{
`F
`
`230 \
`219
`
`220 240
`
`FIG. 68
`
`230
`. ------
`p4~ --
`i- --------------------- ------------
`I.~~:t __ ::::;;~~~-~I.~l.
`
`le2
`
`.2
`
`230
`
`:
`_ :-~~.
`~ ~: .1
`
`- --------'!+-----
`
`230
`
`F 220 240
`
`218 230
`
`Page 7 of 25
`
`

`

`u.s. Patent
`
`.Iun. ]8, 2002
`
`Sheet 7 of 16
`
`US 6,407,795 Bl
`
`FIG. 7
`
`ya
`
`xl
`
`y
`
`ly2
`
`I Y
`
`!II : "I
`
`.
`l~'
`
`•
`I ..
`
`50
`
`Xa
`j -er
`Ix2 ;1~7
`
`Ixl
`
`lyl
`40a
`
`/:
`~
`cyl
`;
`
`12
`
`xr
`
`rr
`
`xb
`
`lyl
`40b ~
`~
`61a
`71
`
`2 3
`
`Ixl
`
`I
`I
`
`41a
`
`Iyl
`
`Iyl
`
`Xb
`
`\--- xa
`16
`1
`
`Page 8 of 25
`
`

`

`U.S. Patent
`
`Jun. 18, 2002
`
`Sheet 8 of 16
`
`US 6,407,795 Bi
`
`FIG.8A
`
`leI 208
`
`84
`D
`
`t
`
`80
`
`82
`
`FIG.8B
`
`RL
`
`82
`
`80
`
`83
`
`Dout
`
`81
`
`Din
`
`Page 9 of 25
`
`

`

`c
`+
`
`
`7 /
`/ I?
`’2“
`
`
`
` _
`wy
`
`18
`14 --I-t--;~ n_- 6
`
`U.S. Patent
`US. Patent
`
`.J un. 18, 2002
`Jun. 18, 2002
`
`Sheet 9 of 16
`Sheet 9 of 16
`
`US 6,407,795 Bl
`Us 6,407,795 Bl
`
`FIG.9
`
`19
`
`17
`
`I.“
`
`
`
`wx
`
`21
`
`16
`
`1
`
`Page 10 of 25
`Page 10 of 25
`
`

`

`U.S. Patent
`
`.tun. 18, 2002
`
`Sheet 10 of 16
`
`US 6,407,795 Bl
`
`FIG. 10
`
`12b,J
`
`24
`
`12a~A
`
`21~v
`
`13
`
`+
`C
`
`14
`
`21
`
`16
`
`Page 11 of 25
`
`

`

`U.S. Patent
`US. Patent
`
`Jun. 13,2002
`Jun. 18, 2002
`
`Sheet 11 of 16
`Sheet 11 of 16
`
`US 6,407,795 Bl
`Us 6,407,795 B1
`
`FIG. 11
`FIG. 11
`
`17
`
`19
`
`c
`~
`
` mam//'V/'V/',//"//
`
`11
`
`
`
`18
`
`14-1-~
`
`IJ....-- 6
`
`15
`
`1
`
`Page 12 of 25
`Page 12 of 25
`
`

`

`U.S. Patent
`
`Jun. 18,2002
`
`Sheet 12 of 16
`
`US 6,407,795 Bl
`
`FIG. 12
`
`Din
`
`6 (5)
`
`6 (5)
`
`: •••••• 0.
`
`:-.....
`: sw
`" . . .. . ..
`·
`.
`Vdd~--t
`Ck
`Din .... ~-t
`
`I Dout ...,...-;
`GND · . . ... '"
`. =,
`·
`= SW
`" . . .. . ..
`. r-+-...,
`·
`Vdd~--t
`Ck
`Din -+i~-t
`I
`Do u t ..... -+-,
`GND
`
`!
`
`:-....
`= SW
`
`Page 13 of 25
`
`

`

`U.S. Patent
`
`Jun. 18, 2(K12
`
`Sheet l3 of 16
`
`US 6,407,795 BI
`
`FIG. 13
`
`10 or 14
`
`30
`
`21
`
`1
`
`220
`
`31
`
`31----4---
`
`Page 14 of 25
`
`

`

`U.S. Patent
`
`Jun. 18, 2002
`
`Sheet 14 of 16
`
`US 6,407,795 BI
`
`FIG. 14 PRIOR ART
`
`103
`
`wxl
`
`1
`
`Page 15 of 25
`
`

`

`U.S. Patent
`
`.Iun.18,2002
`
`Sheet 15 of16
`
`US 6,407,795 Bl
`
`7 (I
`5_ lI" ...
`( ~ "2
`6"-
`
`/3
`
`F,
`
`"
`~ ::::-....
`
`"-
`
`FIG. 15
`
`It ....
`
`It·· ..
`
`rt····
`
`It· ..
`
`"4
`
`1/
`
`V
`
`.....
`
`::::::::\ \.
`
`(
`
`\\
`
`.......... 1
`
`PRIOR ART
`
`Page 16 of 25
`
`

`

`U.S. Patent
`
`Jun. 18, 2002
`
`Sheet 16 of 16
`
`US 6,407,795 BI
`
`FIG. 16
`
`208
`
`230
`
`204
`
`206
`
`'\
`202
`
`200
`
`\
`
`1
`
`PRIOR ART
`
`Page 17 of 25
`
`

`

`US 6,407,795 Bl
`
`1
`LIQUID CRYSTAL I)J SPLAY AND 11'5
`INS I)ECTING METHOD
`
`TECHN ICAL rIEL))
`
`1be present invention re lates \0 a liquid crystal display for
`a video monitor such as a television receivc:r or a display of
`a computer system, and particularly [0 a method of fabri(cid:173)
`cating arK! illspccting the display.
`
`BAC KGROUND ART
`
`.5
`
`2
`extcTIlal circuit board 103, respectively. In FIG. 14, the
`width of the Ilexible circuit board 101 and the width of the
`flexible .:ircuit board L02 are denoted hy wy l and wx l
`r.::spcctivcly.
`FIG. 15 is a schematic overall view of the liquid crystal
`panel 1. A pixcl is disposed at each intersection 2 between
`a signal line 3 and a scanning line 4 . A region of tbe liquid
`crystal panel I where t he pixels are arraoged is called an
`image display region. and the other region where pixels arc
`10 not disposed is called a no n_image display n:gion . 'Ille signal
`liue driving LSls 5 for driving the sigua[ liue aud tilt:
`scanning line driving LSls 6 for driving the scanning line arc
`called driving ISis. The termina l conductors 7 and H (al<;o
`called connector ports) .1fe disposde at the outward edge of
`t5 the liquid crystal panel I. The tennina l conductors are
`classified into signal line terminal conductors and scanning
`line terminal conductor!'.. 'n 1e flexible circtl.it boards 101 and
`102 [Orc connected to the signallinc terminal conductors and
`the scanning line tennina! cOnductOfS, respectively. The
`circuit board 103. which often employs a printed circuit
`board, includes a control circuit generating the control
`s ignals.
`FI O. 16 is a schematic view of a pattern of wiring on the
`flexible c ircuit board WI or 102 and an arrangement of the
`terminal conductors 208 on tlie liquid crystal panel 1. As
`shown in Fl U. 16, each Uexib[e circuit board 202 includes
`transmi<;.sion lines (bus lines) 200 for transferring the control
`signals and connector porls 220 corresponding to the termi-
`nal COIK[U CIO[s 208 joined \0 the signal line or scanning line
`driving LSI, respectively. Refercnce numerals pil and pi2
`denote the distance between the closeslterminal conductors
`20t! o f any two adj acent driving LSls 206 . The distan« is
`called as an LSI pitch hereinafter. Plural driving L..Sls arc
`olien disposed at various LSI pitchs, respectively.
`As shown in PIO. 16, the terminal conductors 210 are
`connccted at least to the input porlS of the driving LSI 206 .
`Oth.:r terminal conductors may be provided for connecting
`to a common electrode to which a refe rene<: operational
`voltage is applied, and to a repair line for replacing a
`defective signal or scanning lines.
`In case that the driving LSIs are replaced with different
`types or their installation is modified due 10 a specifieation
`change in the liquid crysta l panel, the LSI pitch or the
`number of the terminal conduclors may be varied. 'Ibis
`requires re-designing of the flexible circuit boards.
`FlO. 14 illustrates an extcnded form of thc Ilexible circuit
`boards 101 aOO 102. The flexible circuit boards 101 and 102
`are often used as shown in FlO. 14 but may be folded 10 an
`L-shapc or U .shape al til.: .:;\g.: uf tli.: lillujd .:rystal pand L
`in ordcr to reduce a frame of tbe liquid crystal display, as not
`shown
`'111<: !kxiblc .:ircuil boards 101 and 102 aN mount.,;" 10
`conductors at the rim of the liquid crystal panel 1 with an
`55 anisotropica lly conducti ve adhesive 9 which is appl ied and
`heated. 1be board may be heated at a tempe rature of about
`200" C. duriog the heating, iCj the Oexible cin;uit boaro is
`thermall y expanded or contracted. the pitch between the
`connector ports may be deviated from an o riginal one, that
`is, a pitch error may be developed. If the pitch error is not
`negligible, the connector ports and the terminal conductors
`may b.: connc;;:ted inadcquatdy. For Nducing the pitch error,
`the pitch between th<: connector ports may be thermally
`"'"uII1I"'I1.~atu.t. 111e gu:alcr the width u ( the Ikxible circuit
`65 boards (wyl and wxl in FlU . 14), the more accurate thennal
`compensation for the pitch lI1easurements will be required,
`and 111115, the compensation inerea..<;es an overall cost.
`
`As liquid crystal displays have recently been improved in
`a low-volta~c operatio/), low power l."'OllSlllllplioll, amI
`thickness., the displays are widely used as AV devices, OA
`devices, or house-hold appliances as well as television
`rccejvcrs or monitors. Also, Ihey have an increased scree.1
`size.
`In such a liquid crystal displa y, a liqu id crystal driving
`LSI is commonly mounted as a semiconductor .:;:r.i p by a
`mounting method selected from various techniques. As Ibe w
`method. a tape automated bonding (TAB) method and a chip
`on glass (COG) method arc known.
`In the TAB methOl.l (al$O calletl a TAB mounting), a fI[m
`cirnlit board (refcrred to as a tape carrier package or Te p)
`on which a driving LSI chip is mounted has an output port 25
`.:unllC\:\!,:d tu a li'lUiu l:rystal paud auu an iuput port UJj}+
`ncct.ed to an externa l circuit board. Althougb the TAll
`method is often uSC([ for a liquid cry~ta l display, an overall
`size (outline) of the d~play may significantly increase.
`In the COG method (also called a COO mounting) • .30
`conductors disposed at an edge of a liquid crystal panel are
`joined directly to input and output porls (called input/output
`pads) of liquid crystal driving LSIs of a c hip form with an
`anisotropically conductive adhesive. Thereby. the liquid
`crystal driving LSls are locat.::d about th.:: liquid crystal 35
`panel. More spccifkaJt y, the liqu id crystal driving LSI has
`the OUtput pons connected to a signal [inc and a scanning
`line of the liqu id crystal panet. and the inpm porls connected
`to a t.::nninal conductor provided at a rim (often an outermost
`end) of the liquid crySlal panel.
`Sigllals including a data signal , clock signal, and <;ouree
`voltage for controlling an operation of the driving LSIs arc
`.:aJl.:d WillfUl siguals. h i gen.:ral. th.: ':UlIlru[ signals arc
`tram.terred vill each tlexible circuit boa rd (also called Ikx- 45
`ible printed circuit. FPq, which is equipped with transmis(cid:173)
`sion lines (a[so caUed bu~ lines), and received by thc
`terminal conductor.
`'Ibe transmission of the control signals via the FPC to the
`driving LSIs is more advantageous than d ong the transmis- 50
`sion lines provided on the liquid crystal panel in respect of
`the re~is\ance in the transmission lines or the availability of
`the wiring space. 11lis may also be pertinent to a liquid
`cryslal panel of poly-silicon TFT Iy~ w hich has driving
`circuits provided at the rim of the panel.
`'Ilie COG method is more favorable than the TAB method
`in an operat ion ,eliabi l.ity a reullcing of an overall product
`size.
`n o. 14 illustrates a conventional liquid .:rystal display
`having driving LS ls mounted by the COO method. 111e
`output and input porL,> of liquid crysta l driving LSIs 5, 6 arc
`joined to conductors disposed at thc outward edge of a liquid
`cryslal panel 1 with an anisotropieally conductive adhesive
`9. F[..:;xibk ci.rcuil boards 101 aud 102 an; juimxt to tl.!.,;
`wnc!uctors also with the anisotropically conductive adhc+
`si\'e 9. The flexible circuit boards 101 and Hl2 has nthcrend
`CQnn<:ctcd to correspond ing connectors !()4 and 105 on all
`
`40
`
`6(1
`
`Page 18 of 25
`
`

`

`US 6,407,795 Bl
`
`.5
`
`3
`If the liquid crystal pancll changes in a specification or
`screen size. the flexible circuit boards 101 and IU2 has \0 be
`mod ified and rc-dc.<;igncd (e.g. the overall dimensioll<;). Such
`a des ign modification increases a COOl significantly because
`the number of types of the flexible cireui! boards has
`rcccnlly been increasing.
`The 1 ;<]" id crysl:tl panel 1 is gene ra lIy in.;;peclcd, "fler the
`driving LSIs arc mounted, through a visual examination
`wilh a &<;playcd larget. If one of tm: driving LSls 5 or 6 is
`found defective, the flexible circuit boards 101 and 102 is 10
`dismounted, Ihe defective driving LSI is then replaced by a
`new one, and the flexible circuit I>oards 10 I and 102 arc then
`mounted again. TIlll raises a cost.
`When plural driving LSls 5, 6 arc employed. a data shift
`signal is transferred through the LSb in sequence. If a
`defective driving LSI is included in the LSIs.. the data shift
`signal after the ddective driving LSI is not transferred to the
`s uc\;et:ding LSls, Wllkh can not Ihus I;t: inspt:clt:d.
`Therefore, the LSls hlS to be inspected again after the
`cIefoctive driving I A~ I is replaced hy a new one. Thai W
`increases a time and cost for manufacturing the display.
`A process for removing and replacing t he flexible circuit
`hoard .. or the driving L~ls hy new, unlL"ed f1cxihle circuit
`boanls or driving LSls is called as a repairing process.
`It is hence an object of the present invention to provide a
`liquid crystal display afld a method of inspecting the di~play
`which solve the foregoing problem. The display, (or a
`vari,.;ty of modifications of th~ scr~~n si:a; of a Liquid crystal
`panel and of the mourJtiug arrangement, may Ix desigrJed .30
`freely and have a design changed easily especially even for
`a large sizcd liquid crystal panel. 'Ibc display and method
`allow a defectivc driving LSI to be specified within 1 short
`time. allow the defcctive driving LSI or flexible circuit board
`to be repaired or replaced easity, and aHow C"Ommon COll)- 35
`ponenls to be u.sed. That bence decreases an overall cost and
`increascs an operational reliability.
`
`4
`At \cast one of the 111m jum]X"-r boards FX, FY may
`include a multi-l ayer wire for connccting a jumper wire.
`'Ibis allows the fi lm jumper board to have connector ports at
`one end thereof being fewer Ihan those 3t Ihe olher end.
`At leaSl. one oftlIe film jumper boards FX and FY lllay be
`connected to the circuit board with an anisotropically con(cid:173)
`ductive adhesive by thennocomprcssion-bonding. "Ibis con(cid:173)
`tribUies 10 a low COSt and a high operational reliability of the
`liquid cryl>tal display"
`'Ibe film jumper board FY may be folded I"rom the front
`side to the back side of the liquid crysta l panel along lhe
`edge at the end where the first terminal conductors are
`d isposcd. l be film jumper board FX may be CohJed frOm the
`front side to the back s ide of the liquid crystal panel along
`15 the eclge at the end where thc second terminal conductors are
`disposed. l bereby, Ihc liquid crystal display with a narrow
`frame can be impleme1l1ed at lower cos\.
`TIlC film jumper board FY may Ix connected to Ihe circuit
`board and the firstlerminal conductors, and 11 flexible cireuit
`board may bave COlUleClOr ports at one end connected to the
`second terminal conductors by thermocompression (cid:173)
`bonding, and connector ports al the other end connected to
`Ihc circuit board with a connector. The film jumper board f'X
`is connected to the circuit board and the second terminal
`25 conductors, and a flexible circuit board may have connector
`porls at one end connected to the first termina l C"Onductors by
`therlllocolllpr"ssion-boilding, and connector ports 3t the
`other end collnected to the circuit board with a connector.
`rhis contribute." to the simply as • ..embled construction of the
`liquid crystal display w ith a narrow frame.
`A liquid crySl.al display includes a liquid crystal panel,
`circuit board, and film jum]X"-r boards. T be liquid crystal
`panel includes plural signal and scanning lines disposed in
`malrix. signal line driving LSls dispos.:;d around Ihe lints.
`lirstterminal conductors coupled to the signal lines throngh
`the signal line driving L'iis, <;canning line driving L~ l s, and
`second lerminal conductors coupled to Ihe scanning lines
`through thc scanning line driving l.sls. The circuit board
`includes connector IXlrls for driving the ftrst and second
`40 tcrmi.nal conductors of the liquid crysl3l panel. "The J1im
`jumper boards includes control signal lines and connector
`ports provided at both ends of the con trol signal lines. Each
`o f the 111m jumper board s couples the connector porlS at o ne
`end of lhe control signal lines wilh the lermin31 conductors
`45 of 3t least one of the signal line driving LSls coupled to the
`first termin31 conductor.> of Ihe liquid crystal panel and the
`scann ing line driving LSls coupled to the second terminal
`conductors of the liquid crysl<ll panel. A method according
`10 tho; prcscnt iuv";l]tiun [ur inspc<.:tillg th~ lillUid l"fystal
`so display includes at least one of the steps 0 1"- (a) connecting
`the connector ports at other end of the film jumper board 10
`thc transmiAAion lines for the control signals with a connec,
`tor o[tbc circuil board for the inspection; and (b) connecting
`between the connector ports at the other end o f the film
`55 jumpe r board and lhe teoninal condnctors by a pres.sure for
`the inspection.
`This allows a defective driving LSI or any faul1 on the
`film j umper board 10 be readily specified and correclly
`repaired fast.
`The driving l..s ls, if being switched belween a cascade
`operation and single operation, allows a defective I ~'i i to be
`specified easily.
`BRI EF DESCR1P"nON OF 1l-I E DRAWINGS
`Flu . 1 is a schematic view of a primary part of a liquid
`crysta l d isplay according to a firS!. cmbxliment of the
`present invention.
`
`DISCLOSURE OF 11-1E INVENTION
`
`A liquid crystal display aCCOrding to the present invent ion
`includes a liquid crystal panel. circuit board, and fi lm jumper
`bo:1.f(1s (deooted by F Y and FX). "n ,e liquid crystal pancl
`includes plural signal lines and scanning, lines dispused itl
`matrix, signal line driving Uils disposed around the lines,
`firsttcrmin~1 conductors coupit:d to the signallinc~ through
`Ibe signal line driving LSls, scanning linc driviog LSls. and
`second terminal oooductors coupled to the oorresponding
`scanning lines through the scanning line driving LSls. The
`cirL-uil board includes L"Onncctor ports for driving the first
`and second terminal conductors of the liquid crystal panel.
`The film jumper boards (denoted by FY and FX) each of
`which iDeludes control signal lines and dummy lines, is
`connected to at least o ne of the first term inal conductors
`coupled 10 the signal line driving LS I atKl tl)(; second
`conductor terminal cou pled to the scanning line driving LS I
`on the liquid crystal panel.
`"Il,at I,rovid",.., the lit.juid crystal display whidl cau Ix
`easily designed and modified freely, and which has a high
`operational reliability and a low cost.
`The liquid crystal display may include the same number 60
`of the signal line driving LSls as that of the film jumper
`boards FY which respectively correspond to Ihe signal line
`driving LSls. "Ibe display may include the same number of
`the 5Cauniug liu,", driving LSls <ll> lilat of tile film jUlllp"]
`boanls FX which respectively correspond to the line scan- 6S
`ning LS ls. l bis allows a defective driving L~ l l0 1lc repaired
`easily.
`
`Page 19 of 25
`
`

`

`US 6,407,795 Bl
`
`.5
`
`5
`FIGS. 2A and :m show a relaTionship between jumper
`wires. connector ports fo rmed on a film jumper board, and
`correspondi ng Terminal conductors.
`R GS. J A and 3B show another paltcms of The jumper
`wifC.s on the film jumper board than those shown in FIGS .
`2A and 2.1l
`FIG. '* is a cross 1>Cclional view of a primary parI o f a
`liquid crysta l display according 10 a second embodiment of
`the invention.
`FI G. 5 is a cross sectional view of a primary part o f a
`liquid crystal d isplay according 10 a third embod iment of the
`invention.
`FIGS. 6A aDd 6B arc schematic views of a film jumper
`board in a liquid crystal display acconling to a fourt h
`embodiment of the invention.
`FIG. 7 shows an arrangement of a liquid c rystal panel and
`c.ircuil boards accord ing to a !iflh embodiment of The iovell·
`lioo.
`FIGS. SA and SB show pal1erns o f tbe jumper w ires of tbe W
`circuit board.
`FlG. 9 shows an arrangement of circuit boards in a liquid
`crystal display accord ing to a sixth embodiment of the
`invention.
`n G. IO shows an arrangement of circuit boa rd~ in a liquid
`crystal display according to a :';Cven th emho diment of the
`in,·ention.
`FIG. IJ is a schematic view showing a mcthod of inspect(cid:173)
`ing a liquid crystal display according 10 a eighth embodi(cid:173)
`mcnt o f tbe invention.
`IlG. 12 is a diagram illustrating a switching between a
`cascade operation and single operation of the driving LSI.
`FIG. 13 is an explanatory view of joining the film jumper
`board and the liquid crystal panel by a pres.surc
`FIG. 14 is a S<.:hel1latic view of a primary pari of a
`conven tional liquid crystal display.
`FIG. 15 is as schematic view of the liquid crystal pancl.
`FIG. 16 is a schemat ic view of wiring of a Ilexible circuit
`bout! and an ammgem ent of terminal conductors.
`
`w
`
`6
`circuit board 12 and also inpm to the scanning line circuit
`board 16 v ia conneetoN 17, 1~ and a conn .. :cting cable 19
`between the two con nectors. The connecti ng cable 19 may
`be soldered d irectly whi le the connector 17 and/or connector
`lS is e li minated .
`Driving LS ls 5 and 6 arc dispo~d at a rim of the liquid
`crystal panel 1. 'Ibe jumper boards FY and FX have one end
`connected to the signal line circuit board 12 and the scan ning
`line cirell it board 16, respectively, and have the other end
`connected to terminal conductors 7 and S of the liquid
`crystal panc\ 1 (FIG. 15). respectively. A SO\lfce voltage, data
`!>i!:\!lals, dock T signals, and othl'r o,;ontrol signals arl' input
`to the driving LS ls through the circllit boards 12, 16 and Ihe
`jumper board<; FY, FX. Reference symbols W'j and wx
`15 denote the width of the jumper board FY and the width of
`the ju mper board FX, respectively. The terminal conductors
`connected to the drivi ng, LSI arc spaced at l.X)ual intervals of
`a pitch pt as shown in FIG. 2. l be driving LSls are disposed
`al intervals pil and pi2 , which may nOI however be deferent
`from each other (Sec FI G. 16).
`FIGS. 2A and 2B illustrate the relation between the
`connector ports 218 o f jumper wires 220 on the film juntpo!r
`board F a nd the terminal condue.tors 208 on the Jiqu id crystal
`panel I. The terminal conductors 208 are classified into
`s ignal ports I to n and ports P. 'Ibe signa l ports 1 to narc
`electrically conuected to the input ports of the driving LSI
`206. Th ~ ports P indud~ ports oonnoc t~d to a common
`electrode of the liquid crystal panel 1, a rcpair wire for
`repa iring a broken signa l or scanning lines, and a dummy
`.30 ports connected to nothing. The driving LSIs may thus
`correspond 10 a different number of the terminal conductors
`(See FIG. 16). For example, in ca~ that the number of the
`terminal conductors I' may be varied, this may prevent a
`single type of the jumpcr board FY or r x for being used. A
`35 dilTcrent type o f the Jiqu id crystat panel. which th us IOchujes
`d iflcrem driving LSls, prevents a single type of the jumpo!r
`board FY o r FX [rom being used.
`lllt:n:fon:, upon h~villg jUOl pt:r wires incl ud ing control a
`signal line and a dummy line, a single type of FY o r FX can
`40 be accmdingly even if the nllmber or the terminal conduc(cid:173)
`tors corresponding 10 the driving LS ls is different.
`FI G. 2A i!lustrates the film jumper board F and the
`terminal conductors 208 corresponding to a driving LSI 206
`baving n !>ignal input IXlns. The tcrminal conducton> 208
`45 includc n signal ports and four ports 1'. 'Ibe jumpcrwires 220
`include n control signal lines and tcn dummy lines. As Ihe
`total number oftbe terminal conductors 20S is n+4, six of thc
`jumper wires 220 arc not l.'Onnccted.
`FIG . 213 illustrates thc fIlm jumper board F and the
`50 terminal conductors 208 corresponding to a driving LSI 206
`having n+1 signal input ports. The total number of the
`terminal conductors 208 is n+5 . Because h3ving o ne of the
`ten dummy linl'S which is used as the l.\Jntrol signallinc. the
`lilm jumpcrooard can be identica l to that sbown in FIG. 2A.
`ss This c an be appl ied regardless of the number of the pons I'
`being different between the driving 1",,~l s 206, although not
`shown. The film jumper ooard of Ibis embQdiroent can
`commonly be utilized witholll modification. lbe signallinc
`driving LSls has a difl'crent number o f co ntrol signal lines
`than the .scanning line driving LSIs. l bc number of Ihe
`control signa l lines of a signal line driving LS I is usually
`greater than that of a scanning line driving LSI.
`'Ibe connector ports 218 o f the film jumper board F and
`the o,;ollcsponding Icrminal l'ond uct()Js 2118 011 the liquid
`65 crystal panel 1 are thrmocorupression.boncied to each other
`by hcat ing and applying a pressure with a.n anisotropically
`conductive adhesive 9 at a temperature of about 200'" C. The
`
`25
`
`DESCRIPTION OF nI E PR EFERRED
`EMBODIMENTS
`]) ~<;plays according to cmbodiments of the prcs.cnt inven(cid:173)
`tion will be described referring to the rdevant drawings.
`Like componcms arc denoted by like numerals as those of a
`conveu tionalliquid crysta l display and will be explained in
`no more detail.
`(First Embodiment)
`FIG. I i llll.~trates a primary part o f a liqu id crystal display
`aCCording to a Ilrst embod iment of the present invention, in
`whidl like rumponenls are dl'notl'd by like numer~ls as
`those shown in n Gs. 14 to 16. A liquid crystal panell is
`identical 10 thai shown in FI G . 15 and will be explained ill
`no more detail. Signallinc fi lm jumper circuit boards 10 and
`scanning line film jumper cin;uil boards H are referred in
`general to as film jumper boards F ami tbus de noted by FY
`and FX. respectively, for an easy description. Each lilm
`jum per board includes connector ports provided a\ both ends
`of tbe board and jumper w ires connecting between the
`eonoc<;:tor ports. The film jumper boards may be often made
`of polyi mide resin material, which is much flex ible.
`Adleui! ooard iududing lIan!>w i~ion lim;!> pilllnlll'U fOI
`supplying control sigoals C is divided into a signal line
`circuit board 12 and a scanning line circuit board 16. The
`control signal is inpu t (rom a connector 13 to the signal line
`
`60
`
`Page 20 of 25
`
`

`

`US 6,407,795 Bl
`
`7
`other connector porlS 2J9 of the film jumper board Fare
`connected to
`the circuit board by soldering or
`lhemlOcompre. .... <;ion-txmding.
`The widths wyand wx of the film jumper board F arc
`smaller than the widths wy l and wxl of a flexible circuit
`board for a conventional liquid crystal display (Sec FIG. 14).
`respectively. Therefore, a pilCh error caused by thermal
`c:xpansion or contraction alIects the boards less than the
`conventional one. When the driving LSIs .5 and (1 are
`accompanied with one film jumper board FY and one Jilm 10
`jumper board rx. respectively. as sbow[] i.n FIG. I , the pilCh
`errul may funlin l",; dc,;clilll;d.
`FIGS. 3A arx13 B illustrate olher patterns or the wires 011
`the !lIm jumpcrboard 111a1l those shown in FIG. 2A. FIC,. 3A
`snow.'; s pallcrn includ ing the following cases (1), (2), and
`(3),
`(!) Thc ports 2 111 are di"l'lOscd at a different pitch from the
`other ports 21 9;
`(2) 'Iwo adjoining ports arc jointed to each Oilier by a
`jumper wire a (FIC,. 3 A); anrl
`(3) Two upposing pUrlS 218 and 219 <1 ft; uot juill".:d (as
`denoted by b in FIG. 3A).
`Th e pattern may includes at lea.';t one of the three cascs
`(1), (2), and (3).
`F1G. 3 13 i!lustr~lI;s II 111m jumpc;r board inc\urJing wiring 25
`patterns formed on both sides of the board. J umper wires are
`formed on one side, and a wire denOTed by the dottcrlline is
`formed on the othcr side. "lbe wiNS formed on the both sides
`lrc connected to e~ch {)ther with a through hole T. Such II
`multi·layer wiring arrangement (two layers in FIG. 30) on
`the Him jumper boud allows the number of the ports \0 be
`different between Ihe two ends (n l>n2 in FIG. 313). 'Ibis
`type of the film jumper board can sigllificantly be advatl\a(cid:173)
`~COllS when a single \'ol1a£e or sienal is applied to plural
`lerminal conductors fo r one driving LSI.
`"Ille p itch betwcen the terminal conductors on the liquid
`cryslal panel I is denoted by lept (not shown). Although
`lept_pl is desired, Ihe Thermal expansion and contraction of
`Ihe pilch IpCI negligible for that of the pilch pI. As varying
`according to an influence of thcrmocompression-bonding, 40
`the pilCh pi may be deviated from the pitch lep\. The pitch
`difference t!. is calculaled by:
`
`" wlq>l_pt
`
`8
`Since wy<wl and wx<w2, the pitch errors on the jumper
`boards FY and FX can be reduced. For example, whell the
`width of the film jumpcr board is !flO the wid th of thc Ilexible
`circuit board, the amount of the thermal expansion or
`.5 contraction of the jumper boards becomes !fl~ o f thai of Ihe
`flexible circuit board. ' Iberc(ore, as having the improved
`dimensional accuracy, the jumper boards do 001 requ ire a
`trial pn.xluelion to be repeated for determining a temperature
`compensation to reduce tbe pitch error.
`Also, if each driving LSI oorreSjXlnds 10 each iilm jumper
`board as shown in FIG. I , a ddedive L SI can easily be
`["~plau;d by a new LSI.
`Moreover, one particular type of the film jumper bouds
`can commonly bc used between differenl liquid crystal
`15 panel.,.
`Including the casco wh ich will be described later, Ihat the
`film jumper boards docs not correspond to the driving LSls
`onc by one, each film ju mper boards may be fabricated with
`a simple, low-cost punching die, and havc a simple wiri ng
`w paller (Sec FIG. 2).
`As. described. the liquid crystal display employing the
`fi.lm jumper board of this embodiment can be dcsigned
`freely and easily, hence having a reduced cost and increased
`operational reliability.
`While the circuit board s hown in FIG. I incorporates the
`s ignal line circuit board 12 and scanning line cirruit board
`16 into which tb~ dn.:uit board is divided, tm: circuit buard
`may consist of a single circuit board. 'Ibe circuit boards 12
`and 16 may be jo ined to the respective jumper boards FY
`JO and FX by no! nnly soldering but also the r mocomprcssion(cid:173)
`bonding with an anisotropically conduct ive adhesive. The
`therrnocornpressioD-bollding with aD