IPR2015-00862
`Petition for Inter Partes Review of U.S. Patent 7,202,843 - EXHIBIT 1003_Page 1
`
`

`
`"U99(‘P
`(‘D
`
`=(‘P
`>as
`
`as
`r.O
`
`99
`*2.O
`
`
`
`= "
`
`U
`s:
`.O
`99(‘Pto
`
`
`
`
`cr
`
`O= >s
`
`
`
`
`image data
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`data memory
`
`unit
`12a
`
`
`
`
`
`temperature
`
`
`memory unit 26
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`firet memory
`
`Unlt
`
`
`
`
`
`
`
`
`
`:
`"9
`I9
`4-‘
`I9
`
`
`6O0
`
`
`3 ®:
`OH
`
`-(‘D
`(‘D(‘P
`D—|
`
`:
`
`
`\O
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`L______-___-___-_-_______
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`rate detecting
`
`
`unit
`24
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`timing control unit
`
`DRV
`
`
`
`
`
`
`
`
`
`
`1_4
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`gate driver
`
`E
`
`
`
`Page 2
`
`

`
`"U9:(‘P
`(‘D
`
`=(‘P
`>*5
`
`*5
`T.O
`9:
`
`S’.c
`
`
`
`= "
`
`
`SU
`
`U
`‘
`r.O
`9:(‘P10
`
`
`
`
`
`c= >S
`
`
`
`
`
`02°
`N
`4-‘
`
`
`Ncco
`
`
`: m'
`
`5"(‘D
`(‘D(‘P
`
`Nc"
`
`
`'5
`
`\D
`
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`target value
`
`
`
`transmittance
`
`
`
`
`
`
`
`appliedvoltagevs
`(display data)
`
`
`
`
`
`‘ "‘ '
`‘ “‘
`
`target value(+)
`
`
`Vcom :
`
`
`
`
`mtlarg-et ~vaiue_(— )_
`
`
`
`
`
`
`
`
`
`_ target value
`B2
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`target value(-)
`
`
`
`Fig.2
`
`
`
`
`Page 3
`
`

`
`"U99(‘P
`(‘D
`
`=(‘P
`
`>as
`as
`
`r.O
`99
`
`*2.O
`
`
`
`= "
`
`cr
`
`
`
`U
`i:
`.O
`99(‘Pto
`
`
`
`
`
`O= >i
`
`
`
`:
`"9
`I9
`4'‘
`
`I9
`
`
`660
`
`
`3 ®:
`
`-(‘D
`(‘DPF
`03
`
`:
`
`\O
`
`
`OH
`
`
`input data
`
`
`
`
`<3°>
`D”:
`
`
`
`
`
`image data
`_
`
`
`(n frame) I operation 1 I
`
`
`
`
`
`
`
`oso (3250
`
`.
`
`Operamn
`
`
`
`
`
`
`
`
`
`DIF
`9°’
`
`
`I
`-
`
`
`operatlon 1
`
`
`image data
`(n+1 frame)
`
`I
`
`
`
`
`
`
`
`
`DIF
`(3%)
`
`
`OperaHOn2
`
`
`
`
`oso <32”
`
`
`t-
`
`Opera ion
`
`Du:
`
`
`
`.
`
`<32”)
`
`
`
`
`I
`
`5
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`image data
`
`(n' 1 frame)
`
`
`
`
`
`I
`
`
`
`
`
`image data12_a
`
`
`
`
`difference data
`
`
`
`2 ooo
`(Name)
`12b E SUM (3 c)
`
`
`
`
`
`operation
`
`
`
`
`
`
`
`
`
`
`
`display data
`(to timing control
`
`
`
`
`circuit 14)
`
`subfield SF1
`
`
`f
`
`
`(n rame)
`
`-
`
`
`
`nsubrieid SF2
`
`
`(n frame)
`
`
`
`, --------------------------1
`
`
`I:
`I
`g
`:
`
`
`
`
`(n+1 frame)
`difference data
`
`
`
`
`
`
`OSDn+1
`
`
`
`
`
`
`
`
`subfield SF1
`
`
`
`
`(n+1 frame)
`
`
`
`
`S M (320)
`
`
`
`
`
`
`
`
`
`ODDM1
`
`
`
`
`'
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Page 4
`
`

`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`!‘f?;;;,.;;r,;;,'y1,r?.
`
`
`
`data memory
`
`
`Unlt
`Ea
`
`
`
`
`
`-
`
`
`
`memory
`E
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`'
`
`
`
`
`:
`
`
`
`
`
`
`
`
`
`
`1
`
`I
`!
`2
`
`1
`
`j
`5
`i
`
`
`
`I
`
`5
`
`
`second E _
`
`
`
`operational unit
`;
`-
`’
`
`torpnleracgational % E
`
`
`ODD
`:
`I
`
`. _ _ . . . . _ _ _ . _ . . . . . . . . . . . . --4
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`data comparison unit Q
`
`
`
`
`
`T ''''''''''''''''''''' _'d_a1't3'<:3r'1V«e'r—si$'p_e1'rt_Tc)_".
`
`
`image data
`
`
`
`
`
`
`
`
`
`
`
`
`
`rate memory
`
`
`
`Umt
`
`
`
`E
`
`
`
`I
`
`1
`!
`I
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`1
`
`'
`
`j
`
`i
`
`'
`
`3_4
`operationalunit
`!
`
`
`
`
`
`I . _ _ . . . . . . . . . . . . . . . . . . . _ _ _ _ . . . . . _ _ . . . . _ .
`|
`i___________________________
`
`
`-.' """"""""""""""""""""""""""""""""""""
`
`
`
`
`34a
`'
`=
`
`
`
`
`operational unit
`
`
`
`
`
`
`DIF
`
`5
`E
`
`
`I
`
`OSD
`
`
`
`. . .
`
`
`
`IVZ609SIO/€00ZSn6J0vmus90oz‘Iz°3nV“0!193!lq“d1I0!193!lddV1“919d
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`timing control unit
`
`DRV
`
`
`
`143
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`rate detecting
`
`
`
`unit
`24
`
`
`
`
`
`
`
`
`
`
`Page 5
`
`

`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`6J09133113gm);‘[5°3nVu0;1e:);[qn(1IIO[1B3[[ddV11131124
`
`
`
`
`
`
`
`
`
`
`
`
`
`target value
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`transmittance
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`time ————>
`
`
`
`
`
`
`
`__tar§Let va|ueL+_) __
`
`
`
`applied voltage VS
`
`
`(display data)
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Vcom 1
`
`Page 6
`
`

`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSn6J0919911390oz‘Iz°3nVHoiwaiiqnduonmziddv1“919d
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`first
`353
`
`operational unit
`
`
`
`
`
`
`
`
`5
`
`
`
`third .
`
`
`operational
`
`“mt
`
`
`
`
`_
`
`3
`
`
`
`
`1—4—C-
`
`
`
`
`
`
`
`
`
`
`
`
`/
`DIF
`
`
`
`_
`
`image data
`
`
`
`
`temperature
`
`
`memory “mt gg
`
`
`
`
`Fate m9m0W
`
`
`Unit
`
`
`
`23
`
`'
`'
`
`!
`%
`i
`I
`
`
`
`
`
`
`
`
`
`
`
`
`
`5
`
`
`
`
`
`
`
`
`3
`
`
`
`
`
`
`
`
`
`
`
`
`
`!
`
`I !L
`
`
`
`
`
`
`
`5
`
`
`
`3 operational unit §§
`
`
`
`__ ___________________ __
`
`
`!'i?a§n7é‘ni}§n33r'y'i§i
`
`
`I
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`i %
`
`i i
`
`
`
`
`
`
`
`data memory
`unn
`
`
`12a
`
`
`
`
`
`second 1§
`
`
`
`
`memory unit
`
`first memory
`
`
`
`
`Unit
`12b
`——
`
`
`
`
`
`
`
`
`
`fourth
`5&1
`
`
`operational unit
`'
`'
`fifth
`0301
`3fi n ~
`-
`
`
`
`
`
`
`
`operational unit
`
`
`OSD2 U second E '
`'
`
`
`
`
`
`
`operational unit
`’
`'
`
`
`
`
`
`
`I
`I
`
`
`
`
`
`
`
`
`
`
`t"
`'
`t
`I
`'t
`lmmg Con ro um
`
`DRV
`
`
`
`
`
`
`gate driver
`
`
`
`18
`
`
`
`GT
`
`
`
`
`
`source driver E
`
`
`
`
`nquid crysta| pane|
`
`20
`
`
`
`
`
`
`Fig. 6
`
`
`
`
`
`rate detecting
`
`
`
`
`unit
`23
`
`temperature 2:2
`
`
`
`
`detecting unit
`
`
`
`
`Page 7
`
`

`
`"U9:(‘P
`(‘D
`
`=(‘P
`
`>*5
`*5
`
`T.O
`9:
`
`S’.c
`
`
`
`= "
`
`USU
`
`
`
`‘
`r.O
`9:(‘P10
`
`
`
`
`
`c= >S
`
`
`
`02°
`
`N J
`
`"Ncco
`
`
`
`
`
`: m'
`
`5"(‘D
`(‘D(‘P
`\l
`
`c"
`
`'5
`
`\D
`
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`I
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`4
`
`FL2
`
`
`
`
`
`
`
`
`
`I
`
`
`SF2
`Cap->'
`
`
`
`:
`v
`
`
`
`transmittance
`
`
`
`__ target Value
`E/B1
`2
`
`
`
`B3
`
`------
`
`
`target value(+)
`
`
`
`
`
`
`
`
`
`I ——target value(-)
`
`
`
`
`
`
`
`applied voltage VS
`
`
`
`(display data)
`
`
`
`
`
`Vcom ;
`
`
`
`time
`
`
`
`
`——t§-r—g—e§ Value +
`
`
`
`
`
`
`
`
`‘——-j—:-:T.___:_:- —:-—...-__-:
`
`targetfix‘/a|ue(-)
`
`
`
`
`
`
`
`
`
`
`F
`
`
`
`
`
`Page 8
`
`

`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`6J08199118900z‘Iz°3nVHoimiiqnd110!199!lddV1“919d
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`input data
`
`
`-
`dt
`'(rm?:m:)a
`
`
`
`
`
`
`DIF
`_
`(30)
`
`
`operation1
`
`
`
`
`
`
`
`(nmframe)
`image data
`
`
`I
`
`
`
`V
`
`
`
`image data
`(n_1 frame)
`
`
`
`OSV1n
`
`
`
`
`
`
`'-
`image data
`(nframe) 1fi'
`
`
`
`
`
`
`
`
`
`
`difference data
`
`
`(” frame)
`
`
`
`
`
`, ............................... -.
`1_2
`
`
`
`
`
`
`I operation 3 H difference data H SUM (359)
`
`
`
`
`
`
`
`(n frame)
`IE ' operation
`I
`(36b)
`
`
`
`
`
`
`
`
`Du:
`
`
`
`
`1_2b_ I SUM (360)
`operation 2 :
`
`
`
`t‘
`opera ion
`
`
`
`(aea)
`
`oso
`
`operation
`
`
`
`
`DIF
`
`
`
`
`‘W’
`
`
`
`
`
`
`
`-
`
`3
`
`:
`
`
`
`
`
`
`
`
`(36a)
`(30)
`
`
`
`
`
`
`
`
`.
`operation
`:
`1
`I.
`OSV1n+1
`operation 1
`
`
`
`
`
`image data
`
`(35d)
`I
`(n+1 frame) E I
`
`
`
`
`
`
`l Sygration 3 H difference data I SUM (359)
`
`
`
`
`
`
`
`
`
`-
`
`
`
`(n+1 frame)
`1_2_C I operation
`
`
`
`
`
`
`difference data
`
`
`
`
`
`
`.r ------------------------------ --~.
`
`
`
`DIF
`
`
`
`
`
`
`
`
`
`
`
`;
`
`
`
`
`
`
`
`
`;
`
`
`operation
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`display data
`-
`.
`
`
`c(:ti<r3C’tLiir{ii1ri‘%controi
`
`
`
`
`Tijjj
`
`
`subfield SF1
`f
`
`
`(n rame)
`
`ODD”
`
`
`subfieid SF2
`
`
`
`(n frame)
`
`
`
`
`
`.
`
`b
`
`Id S
`
`
`f:;eme)F3
`
`
`
`Osvzn
`
`
`
`subfield
`
`
`f
`(n+1rame)
`
`
`
`
`
`
`
`
`subfield SF2
`
`
`(“+1 frame)
`
`
`
`.
`
`
`
`
`
`(n+1 frame)
`
`
`
`
`ODDn+1
`
`Page 9
`
`

`
`"U9:(‘P
`(‘D
`
`=(‘P
`>*5
`
`*5
`T.O
`9:
`
`S’.c
`
`
`
`= "
`
`
`SU
`
`U
`‘
`r.O
`9:(‘P10
`
`
`
`
`
`c= >S
`
`
`
`
`
`02°
`N
`4-‘
`
`
`Ncco
`
`
`: m'
`
`5"(‘D
`(‘D(‘P
`\D
`
`
`'5
`
`\D
`
`
`c"
`
`
`
`
`
`
`
`IVZ609SIO/€00ZSI]
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`transmittance
`
`
`
`
`
`
`
`applied voltage VS
`(display data)
`
`
`
`
`
`target vaiue(+)
`
`
`Vcom ,
`
`
`
`
`
`
`
`
`
`
`
`§overshoot operationi normal operation
`
`
`
`
`
`
`
`
`iovershoot operationi normal 0PeFati0n
`
`
`
`
`
`
`Fig. 9
`
`
`
`Page 10
`
`

`
`
`
`
`US 2003/0156092 A1
`
`
`Aug. 21, 2003
`
`
`
`
`
`DISPLAY CONTROL DEVICE OF LIQUID
`
`
`
`
`
`CRYSTAL PANEL AND LIQUID CRYSTAL
`
`
`
`
`
`DISPLAY DEVICE
`
`
`
`BACKGROUND OF THE INVENTION
`
`
`
`
`
`
`[0001]
`
`
`
`1. Field of the Invention
`
`
`
`
`
`
`
`[0002] The present invention relates to a display control
`
`
`
`
`
`
`
`
`device of a liquid crystal panel for controlling display data
`
`
`
`
`
`
`
`
`to be displayed on the liquid crystal panel, and a liquid
`
`
`
`
`
`
`
`
`
`
`crystal display device.
`
`
`
`
`
`
`
`
`[0003]
`
`
`
`2. Description of the Related Art
`
`
`
`
`
`
`
`
`[0004] Liquid crystal display devices are low in power
`
`
`
`
`
`
`
`
`
`consumption and compact
`in size, and thus are widely
`
`
`
`
`
`
`
`
`
`adopted in personal computers, television sets, and so on. In
`
`
`
`
`
`
`
`
`
`
`a liquid crystal display device, an electric field applied to
`
`
`
`
`
`
`
`
`
`
`each liquid crystal cell (pixel) of the liquid crystal panel is
`
`
`
`
`
`
`
`
`
`
`
`adjusted to change the transmittance of the liquid crystal cell
`
`
`
`
`
`
`
`
`
`
`for image display. Liquid crystal cells vary in transmittance
`
`
`
`
`
`
`
`
`
`relatively slowly. Consequently,
`in displaying moving
`
`
`
`
`
`
`images in particular, blurs in which data of previous frames
`
`
`
`
`
`
`
`
`
`
`appears overlapped (image trails) tend to occur. This phe-
`
`
`
`
`
`
`
`
`nomenon is unique to liquid crystal display devices, not seen
`
`
`
`
`
`
`
`
`
`in CRTs (Cathode Ray Tubes).
`
`
`
`
`
`
`
`
`[0005] To reduce trails and bring the moving image dis-
`
`
`
`
`
`
`
`
`
`play performance close to that of CRTs, there has been
`
`
`
`
`
`
`
`
`
`
`developed a technology called an impulse drive system
`
`
`
`
`
`
`
`
`which imitates the waveforms of applied voltages in CRTs.
`
`
`
`
`
`
`
`
`
`In addition, even in the case of a conventional hold drive
`
`
`
`
`
`
`
`
`
`
`
`system, techniques named as an overdrive method and an
`
`
`
`
`
`
`
`
`
`overshoot method have been developed for the sake of
`
`
`
`
`
`
`
`
`
`improved moving image display performance. Here,
`the
`
`
`
`
`
`
`
`hold drive system refers to a technology in which signals
`
`
`
`
`
`
`
`
`
`
`corresponding to the same image data are output to the liquid
`
`
`
`
`
`
`
`
`
`
`
`crystal cells over a period of one frame.
`
`
`
`
`
`
`
`
`
`[0006] An overview of the overdrive method and over-
`
`
`
`
`
`
`
`
`shoot method has been disclosed, for example, in FIG. 3 of
`
`
`
`
`
`
`
`
`
`
`
`Japanese Unexamined Patent Application Publication No.
`
`
`
`
`
`
`2001-125067. The overdrive method is a technique for
`
`
`
`
`
`
`
`
`writing more emphasized data signals than the data signals
`
`
`
`
`
`
`
`
`
`corresponding to pixel data for actual display, to the liquid
`
`
`
`
`
`
`
`
`
`
`crystal cells (overdrive) so that the liquid crystal cells reach
`
`
`
`
`
`
`
`
`
`
`their target values in transmittance within a single frame
`
`
`
`
`
`
`
`
`
`period. The overshoot system is a technique for emphasizing
`
`
`
`
`
`
`
`
`the data signals further so that the liquid crystal cells change
`
`
`
`
`
`
`
`
`
`
`
`in transmittance to exceed their target values within a single
`
`
`
`
`
`
`
`
`
`frame period (overshoot), and for restoring the transmit-
`
`
`
`
`
`
`
`tances to the target values in the next one frame period.
`
`
`
`
`
`
`
`
`
`
`
`
`[0007]
`In the foregoing overshoot method, greater empha-
`
`
`
`
`
`
`
`sis on the data signals accelerate the changes of transmit-
`
`
`
`
`
`
`
`
`
`tance (pixel response) with an improvement in the moving
`
`
`
`
`
`
`
`
`
`image display performance. The more the data signals are
`
`
`
`
`
`
`
`
`
`emphasized, however, the greater the differences between
`
`
`
`
`
`
`
`the target transmittances corresponding to the input image
`
`
`
`
`
`
`
`
`data and the emphasized transmittances become. This results
`
`
`
`
`
`
`
`
`in a higher propensity to new trails, sometimes deteriorating
`
`
`
`
`
`
`
`
`
`the appearance of so-called moving image display. The trails
`
`
`
`
`
`
`
`
`
`resulting from overshoot occur depending on the display
`
`
`
`
`
`
`
`
`pattern. That is, when the overshoot method is employed, it
`
`
`
`
`
`
`
`
`
`
`is impossible to enhance the appearance of moving image
`
`
`
`
`
`
`
`
`
`display in all display patterns.
`
`
`
`
`
`
`SUMMARY OF THE INVENTION
`
`
`
`
`
`
`[0008]
`It is an object of the present invention to improve
`
`
`
`
`
`
`
`
`
`
`the moving image display performance of a liquid crystal
`
`
`
`
`
`
`
`
`
`display device. In particular, the improvement in the moving
`
`
`
`
`
`
`
`
`
`image display performance is intended of a liquid crystal
`
`
`
`
`
`
`
`
`
`panel for hold drive.
`
`
`
`
`
`[0009] According to one of the aspects of the present
`
`
`
`
`
`
`
`
`
`
`invention, a data memory unit stores image data to be
`
`
`
`
`
`
`
`
`
`
`supplied correspondingly to each single frame period for
`
`
`
`
`
`
`
`
`which a single frame of a liquid crystal panel is displayed.
`
`
`
`
`
`
`
`
`
`
`A data comparison unit determines, on each pixel of the
`
`
`
`
`
`
`
`
`
`
`liquid crystal panel, a difference between image data sup-
`
`
`
`
`
`
`
`
`plied anew and image data of a frame immediately preced-
`
`
`
`
`
`
`
`
`ing and stored in the data memory unit.
`
`
`
`
`
`
`
`
`
`[0010] A timing control unit generates timing signals
`
`
`
`
`
`
`
`
`synchronizing with respective subfields. The timing control
`
`
`
`
`
`
`
`unit also receives display data from an operational unit in
`
`
`
`
`
`
`
`
`
`
`succession, and outputs driving signals according to the
`
`
`
`
`
`
`
`
`received display data in synchronization with the timing
`
`
`
`
`
`
`
`
`signals.
`
`
`[0011] The operational unit determines, for subfield(s) of
`
`
`
`
`
`
`
`
`a plurality of subfields other than a last subfield, based on the
`
`
`
`
`
`
`
`
`
`
`
`
`
`difference determined by the data comparison unit, exceeded
`
`
`
`
`
`
`
`
`display data for setting the transmittance of each pixel to a
`
`
`
`
`
`
`
`
`
`
`
`value exceeding a target
`transmittance corresponding to
`
`
`
`
`
`
`
`image data supplied anew, the plurality of subfields consti-
`
`
`
`
`
`
`
`
`
`tuting the single frame period. That is, an overshoot opera-
`
`
`
`
`
`
`
`
`
`tion or operations are performed in the subfields except the
`
`
`
`
`
`
`
`
`
`
`last subfield. Then, transmittance of each pixel changes to
`
`
`
`
`
`
`
`
`
`the transmittance which allows the supplied image data to be
`
`
`
`
`
`
`
`
`
`
`emphasized, whereby a displayed image will be more
`
`
`
`
`
`
`
`
`emphasized than the supplied image data.
`
`
`
`
`
`
`
`[0012] The operational unit also determines, for the last
`
`
`
`
`
`
`
`
`
`subfield of the single frame period, based on the difference
`
`
`
`
`
`
`
`
`
`
`determined by the data comparison unit, target display data
`
`
`
`
`
`
`
`
`
`for setting the transmittance of each pixel to the target
`
`
`
`
`
`
`
`
`
`
`transmittance. Consequently, in the last subfield, the trans-
`
`
`
`
`
`
`
`mittance of each pixel changes to the transmittance corre-
`
`
`
`
`
`
`
`
`sponding to the supplied image data.
`
`
`
`
`
`
`
`[0013] Since an overshoot operation or operations are
`
`
`
`
`
`
`
`
`performed within a single frame period and the transmit-
`
`
`
`
`
`
`
`
`tance of each pixel is set to the transmittance corresponding
`
`
`
`
`
`
`
`
`
`
`to the image data, it is possible to avoid trails in moving
`
`
`
`
`
`
`
`
`
`
`
`
`image display. In particular, trails resulting from overshoot
`
`
`
`
`
`
`
`
`operations can be avoided. In other words, overshoot opera-
`
`
`
`
`
`
`
`
`tions causing no trail can be made without increasing the
`
`
`
`
`
`
`
`
`
`frame rate (at the same frame rates as heretofore).
`
`
`
`
`
`
`
`
`
`
`
`
`[0014] Since the transmittance of each pixel changes to its
`
`
`
`
`
`
`
`
`
`
`target value within a single frame period, it is possible to
`
`
`
`
`
`
`
`
`
`
`
`enhance the appearance of moving image display in any
`
`
`
`
`
`
`
`
`
`display pattern and improve the moving image display
`
`
`
`
`
`
`
`
`performance.
`
`
`[0015] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`the target display data which the operational unit
`tion,
`
`
`
`
`
`
`
`
`
`determines for the last subfield corresponds to an exceeded
`
`
`
`
`
`
`
`
`
`applied voltage. The exceeded applied voltage exceeds a
`
`
`
`
`
`
`
`
`target applied voltage to be applied to the liquid crystal panel
`
`
`
`
`
`
`
`
`
`
`
`so as to set each pixel to the target transmittance. That is, an
`
`
`
`
`
`
`
`
`
`
`
`
`
`overdrive operation is performed in the last subfield. The
`
`
`
`
`
`
`
`
`
`
`Page 11
`
`Page 11
`
`

`
`
`
`US 2003/0156092 A1
`
`
`
`
`Aug. 21, 2003
`
`
`
`
`
`
`
`
`transmittance of each pixel can thus be changed to the
`
`
`
`
`
`
`
`
`
`transmittance corresponding to the image data in a single
`
`
`
`
`
`
`
`
`frame period with reliability.
`
`
`
`
`[0016] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`tion, the display data for use in the last subfield is held in a
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`first memory unit so that the operational unit need not hold
`
`
`
`
`
`
`
`
`
`
`
`the display data. This can simplify the circuits of the
`
`
`
`
`
`
`
`
`
`
`operational unit. In addition, holding the display data in the
`
`
`
`
`
`
`
`
`
`
`form of differences can reduce the amount of data to be held.
`
`
`
`
`
`
`
`
`
`
`
`
`As a result, the first memory unit can be made smaller in
`
`
`
`
`
`
`
`
`
`
`
`
`memory capacity.
`
`
`[0017] According to an other aspect of the present inven-
`
`
`
`
`
`
`
`
`
`tion, the display data for use in the intermediate subfield(s)
`
`
`
`
`
`
`
`
`
`
`exclusive of the first and last subfields is held in a second
`
`
`
`
`
`
`
`
`
`
`
`
`memory unit so that the operational unit need not hold the
`
`
`
`
`
`
`
`
`
`
`
`display data. This can simplify the circuits of the operational
`
`
`
`
`
`
`
`
`
`
`unit. In addition, holding the display data in the form of
`
`
`
`
`
`
`
`
`
`
`
`differences can reduce the amount of data to be held. As a
`
`
`
`
`
`
`
`
`
`
`
`
`result,
`the second memory unit can be made smaller in
`
`
`
`
`
`
`
`
`
`
`memory capacity.
`
`
`[0018] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`tion, the operational unit generates the exceeded display data
`
`
`
`
`
`
`
`
`
`and the target display data which allow an average of
`
`
`
`
`
`
`
`
`
`
`transmittance in the single frame period to be substantially
`
`
`
`
`
`
`
`
`
`to the target
`transmittance.
`In other words,
`equal
`the
`
`
`
`
`
`
`
`
`
`exceeded display data and the target display data are gen-
`
`
`
`
`
`
`
`
`
`erated so as to make the time integral of the actual trans-
`
`
`
`
`
`
`
`
`
`
`
`mittance and the time integral of the target value of the
`
`
`
`
`
`
`
`
`
`
`
`transmittance equal to each other. Adjusting the average of
`
`
`
`
`
`
`
`
`
`the transmittance in a single frame period to the target value
`
`
`
`
`
`
`
`
`
`
`
`can achieve constant hues in displaying moving image data,
`
`
`
`
`
`
`
`
`
`resulting in improved display properties of moving images.
`
`
`
`
`
`
`
`
`[0019] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`tion, a maximum value of the target transmittance is set to
`
`
`
`
`
`
`
`
`
`
`
`be smaller than a transmittance corresponding to a maxi-
`
`
`
`
`
`
`
`
`mum value of the exceeded display data which the opera-
`
`
`
`
`
`
`
`
`
`tional unit is able to output. On this account, image data
`
`
`
`
`
`
`
`
`
`
`corresponding to the maximum transmittance can be dis-
`
`
`
`
`
`
`
`played with no differences in luminance between moving
`
`
`
`
`
`
`
`
`images and still images. Consequently, even if an overshoot
`
`
`
`
`
`
`
`
`
`operation or operations are performed in a single frame
`
`
`
`
`
`
`
`
`
`period and the pixels are changed between target values in
`
`
`
`
`
`
`
`
`
`
`transmittance, it is possible to eliminate differences in dis-
`
`
`
`
`
`
`
`
`play properties between still images and moving images.
`
`
`
`
`
`
`
`
`
`
`
`[0020] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`tion, lengths of periods of the subfields are set to be equal to
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`each other. This allows the operational unit and the timing
`
`
`
`
`
`
`
`
`
`
`control unit to operate at the same timing in every subfield.
`
`
`
`
`
`
`
`
`
`
`
`The operational unit and the timing control unit can thus be
`
`
`
`
`
`
`
`
`
`
`
`simplified in circuitry.
`
`
`
`
`[0021] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`tion, a length of the period of the first subfield of the single
`
`
`
`
`
`
`
`
`
`
`
`
`
`frame period is set to be shorter than lengths of the periods
`
`
`
`
`
`
`
`
`
`
`
`of the rest of the subfields. The liquid crystal cells can thus
`
`
`
`
`
`
`
`
`
`
`
`
`make quick changes in transmittance toward their target
`
`
`
`
`
`
`
`values during the first subfield after frame switching. Con-
`
`
`
`
`
`
`
`
`sequently, moving image data and still image data can be
`
`
`
`
`
`
`
`
`
`displayed at the same hues with improved display proper-
`
`
`
`
`
`
`
`
`ties.
`
`
`
`
`
`
`
`
`
`comprises a temperature detecting unit for detecting an
`
`
`
`
`
`
`
`
`temperature of the liquid crystal panel, and a
`ambient
`
`
`
`
`
`
`
`
`
`temperature memory unit. The temperature memory unit
`
`
`
`
`
`
`
`contains temperature correcting values corresponding to
`
`
`
`
`
`
`individual ambient temperatures to be detected by the tem-
`
`
`
`
`
`
`
`
`perature detecting unit.
`
`
`
`
`the
`[0023] First and second operational units correct
`
`
`
`
`
`
`
`
`exceeded display data and the target display data according
`
`
`
`
`
`
`
`
`
`to the temperature correcting values which are output from
`
`
`
`
`
`
`
`
`
`the temperature memory unit in response to the ambient
`
`
`
`
`
`
`
`
`
`temperature detected by the temperature detecting unit.
`
`
`
`
`
`
`
`Consequently, optimum applied voltages can be supplied to
`
`
`
`
`
`
`
`
`the liquid crystal panel all the time regardless of changes in
`
`
`
`
`
`
`
`
`
`
`
`the environment, improving the display quality of the liquid
`
`
`
`
`
`
`
`
`
`crystal panel.
`
`
`
`[0024] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`the display control device of a liquid crystal panel
`tion,
`
`
`
`
`
`
`
`
`
`
`comprises a rate detecting unit for detecting a frame rate,
`
`
`
`
`
`
`
`
`
`
`which is the single frame period, and a rate memory unit.
`
`
`
`
`
`
`
`
`
`
`
`The rate memory unit contains rate correcting values cor-
`
`
`
`
`
`
`
`
`responding to frame rates to be detected by the rate detecting
`
`
`
`
`
`
`
`
`
`
`unit.
`
`
`
`
`[0025] The first and second operational units correct the
`
`
`
`
`
`
`
`
`
`exceeded display data and the target display data according
`
`
`
`
`
`
`
`
`
`to the rate correcting values which are output from the rate
`
`
`
`
`
`
`
`
`
`
`
`memory unit corresponding to the frame rate detected by the
`
`
`
`
`
`
`
`
`
`
`rate detecting unit. Consequently, optimum applied voltages
`
`
`
`
`
`
`
`can be supplied to the liquid crystal panel all
`the time
`
`
`
`
`
`
`
`
`
`
`
`regardless of frame rate changes,
`improving the display
`
`
`
`
`
`
`
`
`quality of the liquid crystal panel.
`
`
`
`
`
`
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`
`
`
`
`
`
`[0026] The nature, principle, and utility of the invention
`
`
`
`
`
`
`
`
`will become more apparent from the following detailed
`
`
`
`
`
`
`
`description when read in conjunction with the accompany-
`
`
`
`
`
`
`
`ing drawings in which like parts are designated by identical
`
`
`
`
`
`
`
`
`
`reference numbers, in which:
`
`
`
`
`
`
`
`
`
`
`[0027] FIG. 1 is a block diagram showing a first embodi-
`
`
`
`
`
`
`
`
`
`
`ment of the present invention;
`
`
`
`
`
`
`[0028] FIG. 2 is a timing chart showing how data is
`
`
`
`
`
`
`
`
`
`
`
`written to a pixel in the operation of the first embodiment;
`
`
`
`
`
`
`
`
`
`
`
`
`[0029] FIG. 3 is an explanatory diagram showing an
`
`
`
`
`
`
`
`
`
`overview of operation of the data conversion part in FIG. 1;
`
`
`
`
`
`
`
`
`
`
`
`
`[0030] FIG. 4 is a block diagram showing a second
`
`
`
`
`
`
`
`
`
`embodiment of the present invention;
`
`
`
`
`
`
`
`
`[0031] FIG. 5 is a timing chart showing how data is
`
`
`
`
`
`
`
`
`
`
`
`written to a pixel in the operation of the second embodiment;
`
`
`
`
`
`
`
`
`
`
`
`
`[0032] FIG. 6 is a block diagram showing a third embodi-
`
`
`
`
`
`
`
`
`ment of the present invention;
`
`
`
`
`
`
`[0033] FIG. 7 is a timing chart showing how data is
`
`
`
`
`
`
`
`
`
`
`
`written to a pixel in the operation of the third embodiment;
`
`
`
`
`
`
`
`
`
`
`
`
`[0034] FIG. 8 is an explanatory diagram showing an
`
`
`
`
`
`
`
`
`
`overview of operation of the data conversion part in FIG. 6;
`
`
`
`
`
`
`
`
`
`
`
`and
`
`
`[0022] According to another aspect of the present inven-
`
`
`
`
`
`
`
`
`the display control device of a liquid crystal panel
`tion,
`
`
`
`
`
`
`
`
`
`
`
`
`[0035] FIG. 9 is a timing chart showing another example
`
`
`
`
`
`
`
`
`
`of driving in the last subfields.
`
`
`
`
`
`
`
`
`
`Page 12
`
`Page 12
`
`

`
`
`
`US 2003/0156092 A1
`
`
`
`
`Aug. 21, 2003
`
`
`
`
`
`DESCRIPTION OF THE PREFERRED
`
`
`
`EMBODIMENTS
`
`
`
`
`
`[0036] Hereinafter, embodiments of the present invention
`
`
`
`
`
`
`will be described with reference to the drawings.
`
`
`
`
`
`
`
`
`
`
`
`[0037] FIG. 1 shows a first embodiment of the display
`
`
`
`
`
`
`
`
`
`control device of a liquid crystal panel and the liquid crystal
`
`
`
`
`
`
`
`
`
`display device according to the present invention.
`
`
`
`
`
`
`
`
`
`
`
`[0038] The liquid crystal display device comprises a data
`
`
`
`
`
`
`
`
`
`conversion part 10, a frame memory 12, a timing control unit
`
`
`
`
`
`
`
`
`
`14, a source driver 16, a gate driver 18, a liquid crystal panel
`
`
`
`
`
`
`
`
`
`
`20, a temperature detecting unit 22, a rate detecting unit 22,
`
`
`
`
`
`
`
`
`
`
`
`a temperature memory unit 26, and a rate memory unit 28.
`
`
`
`
`
`
`
`
`
`
`
`The data conversion part 10, frame memory 12,
`timing
`
`
`
`
`
`
`
`
`
`control unit 14, source driver 16, gate driver 18, temperature
`
`
`
`
`
`
`
`
`
`
`detecting unit 22,
`rate detecting unit 24,
`temperature
`
`
`
`
`
`
`
`
`memory unit 26, and rate memory unit 28 function as a
`
`
`
`
`
`
`
`
`
`
`
`display control device for displaying images on the liquid
`
`
`
`
`
`
`
`
`
`crystal panel.
`
`
`
`[0039] The liquid crystal display device of this embodi-
`
`
`
`
`
`
`
`
`ment operates on hold drive. That is, data signals corre-
`
`
`
`
`
`
`
`
`
`sponding to the same image data are supplied to the liquid
`
`
`
`
`
`
`
`
`
`
`
`crystal cells over a period of one frame (16.6 ms) for
`
`
`
`
`
`
`
`
`
`
`
`displaying a single frame of the liquid crystal panel. Besides,
`
`
`
`
`
`
`
`
`
`each single frame period is divided into two subfields SF1
`
`
`
`
`
`
`
`
`
`
`and SF2 (8.3 ms each) by the timing control unit 14.
`
`
`
`
`
`
`
`
`
`
`
`
`[0040] The data conversion part 10 is formed as an ASIC
`
`
`
`
`
`
`
`
`
`
`(Application Specific IC), and has a data comparison unit 30
`
`
`
`
`
`
`
`
`and an operational unit 32. The data comparison unit 30
`
`
`
`
`
`
`
`
`
`compares image data supplied anew and image data stored
`
`
`
`
`
`
`
`
`last time in a data memory unit 12a of the frame memory 12
`
`
`
`
`
`
`
`
`
`
`
`frame by frame, and outputs the difference in data as a
`
`
`
`
`
`
`
`
`
`
`difference signal DIF pixel by pixel. After the comparison by
`
`
`
`
`
`
`
`
`
`the data comparison unit 30, the data memory unit 12a is
`
`
`
`
`
`
`
`
`
`
`overwritten with the image data supplied anew.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`[0041] The operational unit 32 includes a first operational
`
`
`
`
`
`
`
`
`unit 32a, a second operational unit 32b, and a third opera-
`
`
`
`
`
`
`
`
`
`
`tional unit 32c. The first operational unit 32a generates
`
`
`
`
`
`
`
`
`
`display data for the subfield SF1. The second and third
`
`
`
`
`
`
`
`
`
`
`operational units 32b and 32c generate display data for the
`
`
`
`
`
`
`
`
`
`
`subfield SF2.
`
`
`
`
`
`[0042] The first operational unit 32a determines, simulta-
`
`
`
`
`
`
`
`neously with the start of the subfield SF1, an overshoot value
`
`
`
`
`
`
`
`
`
`
`
`
`pixel by pixel based on the difference signal DIF from the
`
`
`
`
`
`
`
`
`
`
`
`data comparison unit 30, and outputs the determined value
`
`
`
`
`
`
`
`
`
`as display data OSD. Here,
`the overshoot refers to the
`
`
`
`
`
`
`
`
`
`
`driving method for displaying supplied image data with
`
`
`
`
`
`
`
`
`emphasis. That is, the display data OSD exceeds display data
`
`
`
`
`
`
`
`
`
`
`for setting the transmittances of the liquid crystal cells to a
`
`
`
`
`
`
`
`
`
`
`
`value greater or smaller than the transmittances correspond-
`
`
`
`
`
`
`
`ing to the image data (target transmittances).
`
`
`
`
`
`
`
`
`[0043] The second operational unit 32b initially deter-
`
`
`
`
`
`
`
`mines an overdrive value pixel by pixel based on the
`
`
`
`
`
`
`
`
`
`
`difference signal DIF from the data comparison unit 30.
`
`
`
`
`
`
`
`
`
`Here, the overdrive refers to the driving method for chang-
`
`
`
`
`
`
`
`
`
`ing the transmittances of the liquid crystal cells to target
`
`
`
`
`
`
`
`
`
`transmittances corresponding to the image data in a short
`
`
`
`
`
`
`
`
`time. Here, applied voltages to be supplied to the liquid
`
`
`
`
`
`
`
`
`
`crystal cells are slightly higher or lower than the applied
`
`
`
`
`
`
`
`
`
`voltages VS corresponding to the target transmittances (tar-
`
`
`
`
`
`
`
`get applied voltages). That is, display data ODD is target
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`display data for setting the applied voltages VS to a value
`
`
`
`
`
`
`
`
`
`
`
`greater or smaller than the target applied voltages corre-
`
`
`
`
`
`
`
`
`sponding to the image data so that the transmittances of the
`
`
`
`
`
`
`
`
`
`
`
`liquid crystal cells become the target transmittances.
`
`
`
`
`
`
`
`[0044] The second operational unit 32b determines differ-
`
`
`
`
`
`
`
`ences between the overdrive values determined and the
`
`
`
`
`
`
`
`
`target values corresponding to image data supplied anew,
`
`
`
`
`
`
`
`
`and writes the differences determined to a first memory unit
`
`
`
`
`
`
`
`
`
`
`12b of the frame memory 12 as difference data. The third
`
`
`
`
`
`
`
`
`
`
`
`operational unit 32c restores, simultaneously with the start
`
`
`
`
`
`
`
`
`of the subfield SF2,
`the overdrive values for use in the
`
`
`
`
`
`
`
`
`
`
`
`subfield SF2 from the image data written to the data memory
`
`
`
`
`
`
`
`
`
`
`
`
`unit 12a after the comparison by the data comparison unit 30
`
`
`
`
`
`
`
`
`
`
`
`and the difference data stored in the first memory unit 12b,
`
`
`
`
`
`
`
`
`
`
`
`and outputs the resultants as the display data ODD (target
`
`
`
`
`
`
`
`
`
`
`display data).
`
`
`[0045]
`In this way, the image information for use in the
`
`
`
`
`
`
`
`
`
`
`
`subfield SF2 is held in the first memory unit 12b so that the
`
`
`
`
`
`
`
`
`
`
`
`
`
`operational unit 32 need not hold the image information. The
`
`
`
`
`
`
`
`
`
`
`operational unit 32 is thus simplified in circuitry. Moreover,
`
`
`
`
`
`
`
`
`
`holding the image information in the form of differences can
`
`
`
`
`
`
`
`
`
`
`reduce the amount of information to be held. Consequently,
`
`
`
`
`
`
`
`
`
`the first memory unit 12b can be made smaller in memory
`
`
`
`
`
`
`
`
`
`
`
`capacity.
`
`[0046] The timing control unit 14 successively receives
`
`
`
`
`
`
`
`
`the display data OSD and ODD from the first operational
`
`
`
`
`
`
`
`
`
`
`unit 32a and the third operational unit 32c, respectively, and
`
`
`
`
`
`
`
`
`
`
`outputs these display data OSD and ODD to the source
`
`
`
`
`
`
`
`
`
`
`driver 16 as driving signals DRV. The timing control unit 14
`
`
`
`
`
`
`
`
`
`
`
`also generates a plurality of timing signals TIM for operating
`
`
`
`
`
`
`
`
`
`the source driver 16 and the gate driver 18 for the subfields
`
`
`
`
`
`
`
`
`
`
`
`
`SF1 and SF2, respectively.
`
`
`
`
`[0047] The source driver 16 generates, according to the
`
`
`
`
`
`
`
`
`
`driving signals DRV from the timing control unit 14, the
`
`
`
`
`
`
`
`
`
`
`applied voltages VS to be supplied to pixels P (liquid crystal
`
`
`
`
`
`
`
`
`
`
`
`cells) of the liquid crystal panel in synchronization with the
`
`
`
`
`
`
`
`
`
`
`timing signals TIM. The gate driver 18 generates gate
`
`
`
`
`
`
`
`
`
`signals GT for selecting pixels P of the liquid crystal panel
`
`
`
`
`
`
`
`
`
`
`
`in synchronization with the timing signals TIM. The liquid
`
`
`
`
`
`
`
`
`
`crystal panel 20 has a plurality of pixels P which are formed
`
`
`
`
`
`
`
`
`
`
`
`in a matrix.
`
`
`
`[0048] The temperature detecting unit 22 detects the ambi-
`
`
`
`
`
`
`
`
`ent temperature of the liquid crystal panel 20 and outputs the
`
`
`
`
`
`
`
`
`
`detected temperature to the data conversion part 10. The rate
`
`
`
`
`
`
`
`
`
`detecting unit 24 detects the frame rate (vertical synchro-
`
`
`
`
`
`
`
`
`nizing signal), which is th