(5J)Int.C\.'
`HO 4N
`
`5/74
`5/907
`
`JTF'Jm.f!l!'lil'~
`!iI$ljllil~
`D 9068-5C
`B 7916-5C
`
`F I
`
`~~f6-62355
`fIlX:61f(!994)3Jl4 El
`(43)0ll1JEl
`
`!J!!jlli\f4-213899
`
`(22) i±llli\ El
`
`fllX: 4 ij'.(!992) 8 Jlll El
`
`(71)te~;\ 000005821
`fl T'I!i:'.llfpg~~~~f±
`*lllfiJlfP ~J!I;1P *'¥ P~ J!I; 1 006il ±i!!
`(72)§!lI1JJ'lf "it 7i'.
`*Il&:I1fP~J!I;fli *,¥P~J!I;1006il±i!! ffi T'I!i:'.llf
`pg~~~~f±F'J
`(74)f~Jll!A. #llI!± INIl!IEl
`
`(1j. 2 qr,)
`
`I1JJ
`
`(57) ('l!l¥J 1
`( §a~ 1 7 1 -)v l' it~!:l: 7 v - Na'(1)B1<I!1tI§~O)i:':
`'_t~J~JVAA '1' '17',~~lIW(::J: 'J ,
`Jj!(,:!J'i!::
`1711,Z !:filX8'l,n:y,)vC1) J: ) ~ J;f,;i'H1(1))i!1 'J'<JG'iltf-[::::B!t
`i> lIWj[lfr(1)~41!1t!lt~ t(1)j[lfrJ1f&~i!::~JJl"9' i> ~ t i!:: § u"J t
`-9 i>"
`7 1 - JV l' it~!:l: 7 v -1,)1 '€:
`I) 6 t i:':Jj!(,'n'
`(:f11IJj!(,l
`1Ja'll:@!NJ,;7 (::J: 'J 7 1 - Iv 1';t t~!:l:7 V - Lra'O)}{lvA
`;Z T "I 7',~~,JJ i!:: tci: ~ 'i : t (:: J: I), J'<JG'iltf-(1) J;f,ii'11
`N(~-9i>,
`
`6
`_ ... J
`
`IF
`
`1;:1: ;]1/, Lu' 'E I)
`i!': ~ 5t;/]Q •
`'1
`lID Jli!\
`8 )))tll!:H
`q ~.H
`10 no jij: H
`
`7
`1----.1---,
`
`f
`
`Of
`
`I
`1 SN-I
`1
`1
`I
`SN-I
`I
`I
`-SM
`1
`1+ ~, I
`
`1
`I .....
`
`1
`
`1
`
`1
`
`LGD_000505
`
`LG Display Ex. 1009
`
`

`

`( 2 )
`
`~4f1JlJ'f6 - 6 2 3 5 5
`
`( ~4f~HW*V')ffiljll!l]
`X1JII91I~Hg~~ 1 7 1 -A 1"~7J!:T ib 7
`(~w*ri'! 1]
`1
`," 1";<:C I)!:: 71
`," 1"~7J!:L.t~II91I&(g~;lpt,A1J
`1I911&{g ~ ~ V;Jt~ L.t~~bx.c5J'{::1ih.(t(t L t~ffx.c51+lfrj~c 0
`7 1 ,"r~7J!: L.t~II91I&lg~(:1JO~T .t&nlt-5J'1Jo~@]H%
`~ 1Fm:t t2'l'<3J'1rtT,~~~@]H% ,_
`(~W*JJ'!2] J:.~c71 ·····Iv t'.x:C I) 01~;b VJ (:7 v····
`L.x:c I) ~1Fm.u~ ~*Ji'! 1 Gci"M'l'<3J'1rtT~~~@]H%.
`( 'iB8Jj0ilnm~il~BJj]
`(0001]
`(Jlf*J:.0;fljffl-5J'li!J] *'iBBJl(.J:iltB8BF\;f, 'v~ c'01191{&{g
`1 - Iv F llijil/(¥k!«(:::l1i-ib Jt~'i't0~ I \~7,,"":+-iT1J;i';
`~'t'l:cj(ilf,~~~@]HjH:Il!lT ib 10 0'tif, ib ..
`(0002]
`(liE*0;fj'(j;f,[J JlIif., ,j,.'l:!-rvc', 'h7'r- '17'.'l:!OA
`1I!!11li~ c'il!iB'lt)\;f,)v~'l'<3J'·r)\1,-;Z!:: Lt~1I!!11li0ifljJM~
`h\:(!l' L II.. ~ iT) J: -j ~~" iT)~':l{:il!iJ'B c 'T''t7'D 0/ x
`0' )1h'if, ib, il!iBBB c-r''t7'D ;;/x 0')1 {.J:liE*0C Fl T.'l:!
`7'17 0/ x 0' )1(:::l1 L "( *$l'i(::Jj\.'l:!, 'IIlli!:l~h'ilJil~'t di)
`I) , 'l'<3J"tU~0,1\('t' 10 M!fiiT"Fffili.h':}'~ II:;': c' iT)J~:JiJTh'
`if, '), *l!!!lllifll91(l!lI!!l1liiT)*iff!:: L"(i1§ ~h"( I \ib.
`( 0 0 0 3] ~~n:liE*0llJ(J'B)\·1'lv0,~~!ltJ(:')1 \"(llll
`8JlT ib.. tRJ3 (a) !.J:llJ(BBB) ~ ;f,Jt.0liE*0,~~~@]H%,
`(b) (.J:)1 1 "/7·tRJ~3J'T .. tRJ3 (a) (:i31>"( U.J:
`iltBBB) \ ·1'lv0l!!!l1rt1jl,Ij'[(::~jHtt~;w.1ll! r- 7 / 0/-;Z)1, 2 (.J:
`WIGc;w.Ill!)' 7 /0/ 7. )1't',~~~~hibiltB8B, 3 (.J:'/ --;z t'
`71 )\, 4(.J:II91II!3i::iJT[~~~@]Ji!jL 5{.J:7
`r- 1"71 )\~
`3J'T ..
`)1 1 .~ /O'·tRJ ( b ) (.J: 71 - Iv t' !liJI!Jl't.l!t::t1iri'i
`r-O'D'}7
`iT)B!I1II!(g~S!::7
`Hm:tJ1i(:i:lliilfr~hib
`G !:: l!!!lllifJ:.'t-+lf UL ib WIGcl!!!l1rt(;::l1Jt L.t2$-5J'iT)8Jl ib ~
`L
`(000 4] B91(&I§~S(.J:B91i&3i::iJT[,~~~@]H%4 (:J: VJ~
`
`- 7. 1" 71)\3 ~1rL "(;w.1ll! r-7 /0/7.)1 1 0),/- 7.~
`tJ1i L: 1:IIi *& ~ iL ib ,'H, il!i rf/;J{ ;f' I v0~ Th'UJlo]V'lit:it (::
`:l1JtL"(
`), 717 '1 7 Gh';w.Ill!), '7/:/7.)1 ](i)7
`Hl1tJ1i(:(:IIi*€l~ iL, ;w.1ll!), 7 /:;-;Z)1 1 h'l¥ii L"( llJ(rf/;
`2 h;Mi'Y6~ltT ib .. 1'.(I:(:J: VJ 4\-l!!!l1rt{::l1Jt Lt::$c5M
`8Jl ib ~ L h':l!:(tT ib ,
`(0005]
`(9'fjaJlh'~¥i~LJ: -j !::T{',~lHI1!] Lfi't::J;'h't,HciTl11>!
`nlt'('{.J:, k:rn::3J'i-fn1,%l!fiif, ib,
`i{irf/;O));D~;))l{)!f
`W91I&I§~071 -I" t'1liJ'Jl(::l1L "(~I\t~bi), tRJ3
`( b ) 01)i1]0 J: :i {:''')0jiljf1rt0il!irf/;{: l:lliilfr~ hib 11911&
`I§~hq 7 1 - Iv FWI(:ttllij( L "(:l!:lt Lt2tJiii'i, 8Jl ib ~
`,tRJ3 (b)~~
`0:l!:~~if,ib
`b~
`\ \"($ 371 - Iv t'iP0$4 7 1 - Iv 1" (:lI91if!I§~fi:l!:
`1~ Lt~·\!'ri'i, ~J:(l$ 771
`Iv f'iJ'0$8 7 1 - Iv f'
`(:II91I&I§~h\:l!:I~ Lt~tJiii'i't· if, ib, ::: h(.J:~l!!!l0tJiii'i(:
`'iB1£ L, ~I&!:: ~" "(~¥IMth'~lt~- ib ~ c~jiljf0l!!!l'flf
`
`(:~I!YI' ~ hurT!:: \ \ :i rn1i11!!#: ~ fl L "( \ \t~ ,
`(000 6] *'iB8Jl{.J:Hctif*0rn'iI1!,I\(H¥i~tib 100
`'C, il!inBB)' ·;M~ c'V') );D~))l{!fti1J~II'l'<:iT:1rtTV')'~~~@]
`HiI!:: L"( 7 1 -'e 1" 10 L < (.J: 7 v - LJlfll!M0}~'k7.-;z-r
`'17",~~~H3:::~3::: U::J: VJJt~'tlNzilfL, ~l!!!liT)
`iiIii'flfcj(ilf~ ~'.J!i- ib·~ !:: Hlfl''J!:: 1-ib"
`(0007]
`(~iI1!H¥i~T M~bi)0fl'l!] ~ 0§a'.J~J!JVtT M::bi)
`(:*'iB8JjV')'JI<3J'1rtT,~~~@]N%(.J:A:1JII91I&i§~~ 1 71-
`Iv F it~(.J:l 7 v-J,~l!ET ib 71 A)';<:C I) !:: it~
`(.J:7 v - Lx:C I) !:: ~7J!: Lt~II91I&I§~h'0A:!JII91I&lg~
`~~;Jt~ L.t::~ffX:-5J'(::ltMt't Lt~ffX:-5J'~WI~c0~7J!: Lt~
`1I911&{g~H:1JO~T ib~JVtc5}1Jo~@]H%Hlij_ ib ~!:: ~~4f1J&
`U- ib ,
`(0008]
`(Itffl] ..: 011>!JVtL::J: ')"(, 71 - Iv I' ii~(.J:7 v-j,
`r.''t·II91I&lg'}h\:l!:I~ Lt~t,';i'i, 7 1 - Iv I' H::(.J:7 v(cid:173)
`N"'0~nltc51'~1I91(&lg~~H::1i~ Lt::)'I" 7.7. -r '17"~B~
`h\ilJll~!:: ~ '), (7'j ,UnltB'lt; \;f'A 0 J: -j ~'l'<:iT:1rt10)Jt
`~,t'I:~&~-t ib:!:: h''t''f3 ib"
`(0009]
`(~1ii!i(liU] klf*'iBBJl0~~1ii!i(7'H::':l1 \"(, tRJiJij~~ffil
`L~h' 0~JlaJlT ib ..
`
`( 0 0 1 0 ] tRJ U:t3\ \"(, 6 (.J: 7 ·1 -I" J'x :c I), 7
`
`(.J:~nlt-5J'1Jo~@]H%, 8 (.J:iI'Q~l1li, 9 (.J:*~11li, 1 0 Wm
`);'(J:.0J: -j (:11>!nlt~M~'l'<3J'1rtT'~~~@]
`~l1li'tdi)ib,
`HiI(::") I \"( ~0~ltHm2 ~ ffll \"(,j~aJlT ib"
`(00 11] A:!JII91{f!lg~S"1 (::l1V(71-lvt'f1::
`I) 6V')tI:\1J
`1 {.J:l 71-lvt'~7J!:Tib, liE')"(iI'Q~
`11li80t1:\:!J (S"-1 -S" ) {.J:tRJiT)J::i(:71-lv1"r.,
`'C'lI91if!(g~h':l!:I~ Lt~:liibi'i011-:l!:lt7}h\tI:\:!J ~hib, liE
`')"(:::h~.li.~.Ki*L~~0i71-~t';<:C0
`6 iT)tI:\:!J s" _ 1 (:1Jo~Th(;ftl:\:!J lI91i&(g,} S OUT h\1~ to
`tLib ..
`( 0 0 1 2 ] tRJ2 h'to'PljiJ J: 3 (::II91I&A:!Jlg~0 7 1 ...
`Iv 1" !liJl!ijO):l!:(~(.J:7. 7- '1 7~*'t'if, I)" ..: iU:::l1 L"( S
`001 (.J:)\JL.. 7.nlt·5J'~.~ Lt~) ,Iv 7.-;Z -r '17';I*(7)1§~'C
`if, ib c }~A.-;Z7. -r 'j 7'~~!ItJ(.J:It"@H10~1 \:l1~~ .l!h'(t
`))l{ < ,~B~T ib .fl'l!'t;i', {" h'il!irf/;l, 1,'1-(:") 1\ '( 10 It
`liE"? '(mc0t1:\1JlI91if!lg~ So u
`~;'tlcj(~h;ilJll~'Cdi) ib c_
`I ~ 3tRJ (a) 01191(f!(§~S t V(lI91iftX:iJT[~B~@]R414
`{: i:lliilfri-tL{;f J: I ,,,
`(0013] f5j, il!ia8a)~;f'I"U*'f'l'<3J'*Mq 7v-L
`7}0¥;4 8 0*iiiJllj;b'ot~b0(:::':lI\"(b)i:<l\'1 /'.5'
`v7.Jt:ititi', ~J(1(71 /, HllJ(1(71 /0T~"(0l!!!l1rt
`1 - Iv 1",~~~T~' O)'t'}~lv 7.,-;Z -r '"7',~~~{.J:7 1
`- Iv 1";<:C I) 6 ~Ilffl L"( 7 1 -'v t' IliJ'Jl-C~::: ~ 'J ..
`\"(
`H~4\-iilii1rth\7v-L~(::~~~~
`(.J:WI~cx:c I) (.J:7 V - L.:X 'f: I) iltfflT ib, ~~J:J.J:}\1
`8 /'lI91i&lg~V')t.9li'i(::~)1 \"( 10
`i'II~c"if,ib:::!::
`
`LGD_000506
`
`

`

`( 3 )
`
`~~1JIJ'f6 - 6 2 3 5 5
`
`Lh\:) ;t"(to;;J;'\' ..
`(0014]
`'" Y H::
`(Jli8jJ(T)~lr'J J::tf:(T)1; 'i (::2fs;Jli8Jj(j:, 71
`(j: 7 J.-. .. - MR'0I1!tiltlg.yy0~jjx.7H:: lI!tiitlg.yy{::.lli:1l': L t::
`) 'Iv;Z;Z T '1 7°,~~lIWi.i:: :1'3:;;;: :i: U: 1; VJ, 011 :UfilJia"a
`n'f-Iv01; j ;;;::j\!jj';;jf,'j"0Jt'lfPlH i&'i'I'i-is: t "('jliiilii
`(T)~!¥lt1t;;;: .i::0@JJj,"i&'i'I'i.i::5J<:El!-j is: t ii'Ct< is to 0'(
`;!', is _
`( tRlllil 0fiijljt;;;:il~ 8Jj]
`(tRl1 ] 2fs;JliBJj05J<1ii!l01J(::t" (1' ~ :j\!jj';;jf,'j"ij~lIW@)N.&0 7'
`0'11 tRl
`
`(tRl2 ] 2fs;JliBJj05J<1iiliI7U(:t:Ht{S ilJiJb~~lIW(T)1JCIL& i.i::jj';-j
`71 :; :>1'tRl
`(tRl3] (a) t;f;*(7)If~R'j,,~~lIW@)N*O)fo'1 1tRl
`( b ) 1tE*(TJilJi.l'a~~j:1J 0iJCIL& i.i:: jj';-j-:71 :;:> ;t'tRl
`( :M'.yy0lij!8Jj]
`6 71-~y~~~;t~1j:7~-A~~~
`7~nJt7J'1JnJfl:@)Nl\
`8
`iiiltJfl:~
`9 *JfI:~
`1 0 1JnJfl:~
`
`[tRl2]
`
`~I 2 3 4 5 6 7 8 q 10 11
`"'""' I
`
`6
`
`::).r-lH';<'E 1),,",
`I;): ') "-Lu' 1" I)
`'1
`:!!:11I:?l'tm;ill:IllIJ!Il
`8 iIlJU~
`q JI!.~
`10 no;ll:~
`
`6
`
`IF
`
`I
`l
`
`10
`
`I
`I SN-I
`I
`I
`I
`SN-I
`I + -Soi_
`l'"
`I
`
`I
`I
`
`I
`I
`I
`I
`I
`I
`
`LGD_000507
`
`

`

`~#1JIJ'f6 - 6 2 3 5 5
`
`(1213]
`
`I 'iJJ, '5 J ::;:;, :9
`2. xLl'll
`-3
`')-;:zr:'5-{i\
`
`4-
`II:*: ~ j( )UUJ 1m fE&
`5 1-/
`r-~''5-{ i\'
`
`(a.)
`
`II!k:jHl~S
`I
`1I!k:~3ZmE )"A-
`I
`3
`IlIK jJ [ill !l?r
`I
`') - ;:Q:-'71 ii'
`
`~
`
`I
`
`I
`c~'
`I Z
`I ~i
`
`L- __ ~
`
`I
`
`q-
`
`fj'
`I
`~
`~'
`'7
`
`JI
`b
`
`5 - -{
`
`(b)
`
`BJl ~ CL
`
`LGD_000508
`
`

`

`translations@geotext.com
`www.geotext.com
`
`STATE OF NEW YORK
`
`COUNTY OF NEW YORK
`
`ss
`
`CERTIFICATION
`
`This is to certify that the attached translation is, to the best of my knowledge and belief, a true
`
`and accurate translation from Japanese into English of the attached Unexamined Patent
`
`Application No. H6-62355, dated March 4, 1994.
`
`Kristin Santizo, Project Manager
`Geotext Translations, Inc.
`
`Sworn to and subscribed before me
`
`this Loay of tit; vs-f , 20 /'1 .
`
`LYNDA GREEN
`NOTARY PUBLIC-STATE OF NEW YORK
`No. 01 GR6205401
`Qualified In New York County
`My Commission Expires May 11, 2017
`
`t: +1.212.631.7432
`
`Houston
`t: +1.713.353.3909
`
`t: +44.20.7553.4100
`
`Paris
`t: +33.1.42.68.51.47
`
`t: +46.8.463.11.87
`
`t: +49.69.7593.8434
`
`Francisco
`t: +1.415.576.9500
`
`Hong Kong
`t: +852.2159.9143
`
`LGD_000509
`
`

`

`(19) Japan Patent Office (JP)
`
`(12) Unexamined Patent Gazette (A)
`
`(51) Int. Cl. 5
`H04N 5/74
`5/907
`
`Identification Codes
`D
`B
`
`JPO File Numbers
`9068-5C
`7916-5C
`
`FI
`
`(11 ) Japanese Unexamined Patent
`Application Publication Number
`H6-62355
`
`(43) Publication Date: March 4, 1994
`
`Technical Indications
`
`Request for examination: Not yet requested Number of claims: 2 (Total of 4 pages)
`
`(21) Application Number
`
`(22) Filing Date
`
`Japanese Patent
`Application H4-213899
`August 11, 1992
`
`(71) Applicant
`
`000005821
`Matsushita Electric Industrial Co., Ltd.
`1006 Oaza Kadoma, Kadoma-shi, Osaka-fu
`
`(72) Inventor
`
`(74) Agent
`
`MIY AI, Hiroshi
`c/o Matsushita Electric Industrial Co., Ltd.
`1006 Oaza Kadoma, Kadoma-shi, Osaka-fu
`Patent Attorney KOKAJI, Akira (and 2 others)
`
`(54) [Title of the Invention] Display Element Drive Circuit
`
`(57) [Abstract]
`[purpose] To improve image quality, such as the resolution of
`moving images of display elements with slow responsiveness
`like that of liquid crystal panels, through the use of pulse step
`driving in which an inter-field or inter-frame difference
`component of a video signal is superposed on the video
`signal.
`[Constitution] Display element responsiveness is improved
`by performing inter-field or inter-frame pulse step driving
`through the use of a field or frame memory 6 and a difference
`component addition circuit 7.
`
`Field memory or frame memory
`6
`7 Difference component addition circuit
`8
`Subtractor
`9 Multiplier
`10 Adder
`
`6
`
`IF
`
`SDUT
`
`LGD_000510
`
`

`

`[Scope of the Patent Claims]
`[Claim 1] A display element driving circuit comprising a
`field memory, which delays an input video signal by one field,
`and a difference component addition circuit, which adds, to
`the field-delayed video signal, a component weighted by a
`difference component obtained by subtracting the input video
`signal from the field-delayed video signal.
`[Claim 2] The display element driving circuit according to
`claim 1, comprising a frame memory instead of said field
`memory.
`[Detailed Description of the Invention]
`[0001]
`[Industrial Field of Application] The present invention relates
`to a driving circuit with improved responsiveness for a
`display element with slow responsiveness to video signal
`field frequencies, such as a liquid crystal panel.
`[0002]
`there has been extensive
`[prior art] In recent years,
`commercialization of equipment using a liquid crystal panel
`as a display device, such as compact televisions and laptop
`type office automation equipment. Part of this trend has
`involved liquid crystal video projectors. Liquid crystal video
`projectors allow significant miniaturization and weight
`reduction compared to conventional CRT type projectors, and
`also have display performance advantages such as less
`geometric distortion, and have thus drawn attention as the
`leading choice for large screen video equipment.
`[0003] The driving of a conventional liquid crystal panel is
`described below. FIG. 3 (a) is a conventional driving circuit
`of a liquid crystal panel, and (b) shows a timing diagram. In
`FIG. 3 (a), 1 is a thin film transistor provided at the pixel
`level of the liquid crystal panel, 2 is a liquid crystal driven by
`said thin film transistor, 3 is a source driver, 4 is a video AC
`driving circuit, and 5 represents a gate driver. The timing
`diagram (b) shows a video signal S when viewed by the field
`period, a gate clock G supplied to the gate electrode, and a
`brightness L of the area corresponding to the aforementioned
`pixel obtained on the screen.
`[0004] The video signal S is converted to an AC video signal
`centered on a constant bias voltage by the video AC driving
`circuit 4, and is supplied via the source driver 3 to a source
`electrode of the thin film transistor 1. Furthermore, the gate
`clock G is supplied to the gate electrode of the thin film
`transistor 1 in accordance with the vertical scanning of the
`liquid crystal panel, the thin film transistor 1 conducts, and
`the liquid crystal 2 performs optical rotation. The brightness
`L of the area corresponding to each pixel changes as a result
`of the above.
`[0005]
`[problem to be Solved by the Invention] However, the
`configuration described above has the following problems.
`Basically, since the response speed of the liquid crystal is
`slower than the field period of the video signal, if the video
`signal supplied to the liquid crystal of one pixel changes
`compared to the preceding field, as shown in the example of
`FIG. 3 (b), the change in brightness will be delayed by a
`certain time constant. This is the case when the video signal
`in FIG. 3 (b) changes from field No.3 to field No.4 and
`when it changes from field No.7 to field No.8. This occurs
`in the case of moving images, and it poses the problem of
`negatively affecting the image quality of moving images,
`
`(2)
`
`Japanese Unexamined Patent Application Publication H6-62355
`
`such as a deterioration in resolution by leaving a residual
`image, and the like.
`[0006] The present invention resolves the conventional
`problems described above, and an object thereof is to
`improve responsiveness and achieve an improvement in
`image quality of moving images by performing field or frame
`period pulse step driving in the driving circuit of display
`elements with slow response speed, such as liquid crystal
`panels.
`[0007]
`[Means of Solving the Problem] To achieve this object, the
`display element driving circuit of the present invention is
`provided with a field memory or frame memory, which
`delays an input video signal by one field or one frame, and a
`difference component addition circuit, which adds, to the
`delayed video signal, a component weighted by the difference
`component obtained by subtracting the input video signal
`from the delayed video signal.
`[0008]
`[Function] Based on this configuration, in cases where the
`video signal changes between fields or frames, pulse step
`driving in which the inter-field or inter-frame difference
`component is superposed onto the video signal becomes
`possible, making it possible to improve the responsiveness of
`display elements such as liquid crystal panels.
`[0009]
`[Embodiment] An embodiment of the present invention is
`hereinafter described with reference to the drawings.
`[0010] In FIG. 1, 6 is a field memory, 7 is a difference
`component addition circuit, 8 is a subtractor, 9 is a multiplier,
`and lOis an adder. The operation of a display element
`driving circuit configured as above is described using FIG. 2.
`[0011] The output SN-I of the field memory 6 is delayed by
`one field in relation to the input video signal SN' Therefore, in
`the output (SN_I - SN) of the subtractor 8, an amount of
`change is output only when the video signal has changed
`between fields, as shown in the figure. Thus, when this
`amount of change. is multiplied by the weighting coefficient
`K and then added to the output SN-l' of field memory 6, the
`output video signal SOUT is obtained.
`[0012] As can be seen from FIG. 2, the change of the field
`period of the video inpJ.lt signal is stepped, while SOUT is a
`pulse-stepped shaped signal on which a pulse component is
`superposed. Pulse step driving is a means of detecting a target
`with slow responsiveness and then driving that target with a
`faster speed, and it also allows the responsiveness of liquid
`crystal panels to be improved. To this end, it suffices to
`supply the aforementioned output video signal SOUT to the
`video AC driving circuit 4 as the video signal S of FIG. 3 (a).
`[0013] It should be noted that with liquid crystal panels, even
`those comprising approximately 480 horizontal display lines
`per frame, interlaced scanning is normally not performed, and
`all pixels of odd numbered lines and even numbered lines are
`driven in each field, so pulse step driving is performed in
`field periods using the field memory 6. Furthermore, in the
`case of display elements wherein each pixel is driven in each
`frame, the memory uses a frame memory. It goes without
`saying that the foregoing is entirely the same in the case of
`
`LGD_000511
`
`

`

`(3)
`
`Japanese Unexamined Patent Application Publication H6-62355
`
`high-definition video signals.
`[0014]
`[Effect of the Invention] As described above, by performing
`pulse step driving in which the inter-field or inter-frame
`difference component of a video signal is superposed onto the
`video signal,
`the present
`invention can
`improve
`the
`responsiveness of display elements such as liquid crystal
`panels, thus making it possible to improve image quality such
`as the resolution of moving images.
`[Brief Description of the Drawings]
`[FIG. 1] A block diagram of a display element driving circuit
`of an embodiment ofthe present invention.
`
`[FIG. 2] A timing diagram showing a state of liquid crystal
`driving in an embodiment of the present invention.
`[FIG. 3] (a) A block diagram of a conventional liquid crystal
`driving circuit; (b) a timing diagram showing a state of
`conventional liquid crystal driving.
`[Description of Reference Symbols]
`6
`Field memory or frame memory
`7 Difference component addition circuit
`8
`Subtractor
`9 Multiplier
`10 Adder
`
`[FIG. 1]
`
`6 Field memory or frame
`memory
`7 Difference component
`addition circuit
`8 Subtractor
`9 Multiplier
`10 Adder
`
`7
`, ___ -1 ___ ,
`10
`
`I
`I SN-I
`
`I
`I
`
`6
`
`IF
`
`SOtJT
`
`[FIG. 2]
`
`Field No. I I 2.3 4 5 6 7 B q 10 It
`
`Input video signal
`SN --r-+-+~
`
`Difference component
`SN-J-SN -+-~~
`
`Output video signal --f-+-+--f
`SOUT
`
`Brightness L
`
`I
`I
`I
`I
`I
`
`-Time
`
`LGD_000512
`
`

`

`(4)
`
`Japanese Unexamined Patent Application Publication H6-62355
`
`[FIG. 3]
`
`1 Thin film transistor
`2 Liquid crystal
`3
`Source driver
`
`4 Video AC driving circuit
`5 Gate driver
`
`la.)
`Video signal S
`
`driving circuit
`
`4-
`
`I
`
`2.
`
`(b)
`
`s
`
`Field No., t 2 3 4 5 6 1 8 9 10 1/
`:. i
`I I
`I I
`I I
`I I
`~
`I
`I I
`I I
`
`Video signal S
`
`Gate clock G
`
`Brightness L
`
`----Time
`
`LGD_000513
`
`