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` D CRYSTAL
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` J SPLAY
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`The present application claims priority ‘rom Japanese
`
`application JP2008—150605
`
`
`filed on June 9, 2008,
`
`the content
`
` o: which is
`
`hereby
`
`application.
`
`
`incorporated. by reference into this
`
`
`
`
`I.
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`
`
`
` ‘Hfi
`
`NV, jNTlON
`BACKGROUND OF
`
`l. Field of
`
`
`the Invention
`
`
`Thepresentinventionrelatesix>aliquidcrystaldisplay
`
`device,andmoreparticularlytoaliquidcrysta'
`
`displaydevice
`
`which can per-
`
`
`
`
`:orm driving 0'' a liquid crysta'
`
`display panel
`
`
`
`and a backlight suitable for a motion picture display.
`
`
`
`2. Description of the Related Art
`
`A large-sized liquid crystal di
`
`television receiver set or the 'ike i
`
`
`
`in general,
`
`a
`
`sp'ay device used in a
`
` nc'udes,
`
`
`
`backlightwhichhasailightsourcecniabacksurfacecx:aliquid
`
`
`crystal display panel. That is,
`
`the
`
`
`liquid crystal
`display
`
`device includes a so-called direct backlight.
`
`
`In the liquid
`
`crystal display panel,
`
`
`a plurality 0:
`
`pixels are arranged on
`
`a display region in a matrix array,
`
`and with a control 0:
`
`grayscaleso
`
`frespectivepixels,aviewercanrecognizeanimage
`
`the backlight radiated through respective pixels
`
`by light of
`
`
`
`
`
`
`
`
`
`
`for a
`
`
`
`
`of the liquid crystal disp'ay panel.
`
`As a light source 0'
`
`
`a
`'arge—s
`ized backlight
`
`television receiver set or the like, a fluorescent lamp wqich
`
`constitutes a linear light source suck
`
`
`
`as a CCFL or an fifiEP
`
`isusedingeneral.
`
`Ontheotherhand,recently,alightemitting
`
`
`
`
`
`diode which is referred to as Lfi) has
`
`been also proposed.
`
`
`
`
`
`
`
`i3rightness of a pixel of a liquid
`
`crysta' display panel
`
`
`
`through light from a backlight has the following
`
`perceived
`
`relationship.
`
`
`Brightnesso:
`
`
`
`fpixel==opticaltransmissivity(grayscale)
`
`
`
`
`
`ofpixel
`of liquid.crystal displagrpanel><brightness oftdirect
`
`backlight light source.
`
`
`When the linear light sources such as the fluorescent
`
`lamps are used, even when brightness
`
` of
`
`the backlight
`
`is
`
`controlled,
`
`such a control can be per:
`
`
`formed only for every
`
`
`fluorescent lamp and hence, brightness can be controlled only
`
`in one direction resulting in a one-dimensional brightness
`
`control.
`
`
`
`TKDthecontrary,whenmap'uralityO'
`:lightemittingdiodes
`
`in a state that these light emitting diodes overlap with the
`
`liquid crystal
`
`display panel, brightne
`
`
`ss of a backlight can
`
`be controlled two-dimensionally.
`
`Such a backlight control
`
`method
`
`is
`
`re
`
` ferred.
`
`to as
`
`a
`
`local
`
`dimming method
`
`(see
`
`JP-A-2007-l83608
`
`(corresponding [K3 patent publication US
`
`
`
`is arrenged<nia liquid.crysta'
`
` displagrpanel in ainatrix array
`
`
`
`2007/0152926Al)
`
`(patent
`
`document
`
`1)},
`
`and
`
`this method
`
`
`
`contributestotheenhancementcxfadynamiccontrast(xfadisplay
`
`image.
`
`
`
`
`
`SUMMARY OE THfi
`
`NVfiNT ON
`
`
`Recently, an environmental problem.becomes crucial and
`
`hence, a liquid crystal display device is also requested to
`
`
`
`satisfy a demand for low power consumption.
`
`
`
`
`in case O" a liquid crystal display device,
`
`the power
`
`
`consumptionofabacklightoccupiesalargepercentageandhence,
`
`
`
`
`the backlight is considered as a target whose consumption o;
`
`How v r,
`v n wh n th
`
`power is reduced.as much as possible.
`
`above-mentionedlocaldimmingnethodjj;adopted,thereduction
`
`
`of power is not guaranteed.
`
`
`The reason is as follows. That
`
`
`
`is, a control of brightness o: the backlight depends on image
`
`
`
`data necessary for displaying an image on a liquid crystal
`
`displaypanel. Withrespecttotheliquidcrystaldisplaypane;
`
`
`
`
`
`o: a television receiver set or the like, although image data
`
`
`is inputoed at a frame period of 6OHZ or 120 Hz,
`
`the inputted
`
`
`
`image data largely varies and hence,
`
`the inputted image data
`
`
`is constantly changed depending on an intention o: a user.
`
`Accordingly, it is an object of the present invention
`
`to provide a liquid crystal display device which can enhance
`
`power—consumption
`
`
`
`reduction e "iciency
`
`irrespective
`
`
`o;
`
`
`
`inputted image data.
`
`
`
`
`
`
`
`
`r1obrieflyexplainthesummaryoftypicalinventionsamong
`
`
`inventionsdisclosedinthisspecification,theyareasfollows.
`
`
`(1) According to one aspect o:
`
`the present invention,
`
`there is provided a liquid crystal display device including:
`
`a liquid_crystal display panel which includes a<display region
`
`
`
`
`
`formed of a mass of a plurality of pixels; a backlight which
`
`
`has a plLrality 0: light sources receiving a lighting control
`
`
`
`independently,andhasairegionthereofwherethelightsources
`
`
`
`are mounted partitioned into a plurality'of lighting regions;
`
`
`
`
`and.a control circuit which converts image data inputted from
`
`the outside into a video signal to be supplied to the liquid
`
`
`crystal display panel and performs the lighting'control<xfthe
`
`
`
`
`
`backlight, wherein the control circuit forms a "irst
`rame in
`
`
`
`
`
`which image data having a grayscale higher than a grayscale
`
`
`
`
`0: image data to be displayed is formed and a second frame in
`
`
`which image data having a grayscale lower than a grayscale of
`
`the image data to be displayed are formed, and alternately
`
`
`displays the image data in the ”irsL "rame and the image data
`
`
`in the second frame, and the backligrt performs the lightiqg
`
`
`
`
`
`
`
`
`controlforeverylightingregionofthebacklightinconformioy
`
`
`with a display content of the liquid crystal display panel.
`
`
`
`(2) In the liquid cryStal display device 0: the present
`
`
`
`
`
`
`
`the ligrt sources o;
`
`invention laving the constitution (l),
`
`
`
`the backlight may be light emitting diodes.
`
`
`
`(3) In the liquid crystal display device 0: the present
`
`
`
`inventionhavingtheconstitution(2),thelightemittingdiodes
`
`mayrbe arranged.in alnatrix array at positions where the ;
`
`
`
`
`emittingwdiodes overlap)with the liquidwccystal disp'agrpa
`
`
`(4) In the liquid crystal display device of tre pre
`
`
`
`ight
`
`nel.
`
`sent
`
`
`e of
`
`sent
`
`
`
`inventionhavingtheconstitution(2),'
`
`
`
`:hepluralityoflighting
`
`
`
`
`regions is partitioned in a check pattern on a substrat
`
`the backlight.
`
`
`(5) In the liquid crystal display device of the pre
`
`
`
`
`
`
`
`invention having the constitution (2), the plura'ity'of'
`ight
`
`emitting diodes is arranged in the lighting regions.
`
`(6)
`
`
`
`:n the liquid crystal display device 0: the pre
`
`
`invention having the constitution (l), brigrtness of the l
`
`
`
`
`source of the backlight is controlled_in conformity'with_i
`
`
`
`
`
`grayscales of the respective image data in the ”irst "rame and
`
`sent
`
`ight
`
`nput
`
`
`the second frame.
`
`
`Thepresentinventionij;notlimitedJXDtheliquidcrystal
`
`display device having
`
`the above-mentioned constitutions and
`
`
`
`various modifications can be made without departing from the
`
`
`
`techqical
`
`
`
`concept 0;
`
`the present
`
`invention.
`
`Further,
`
`examples other
`
`than the
`
`above—menti
`
`oned
`
`
`
`oi
`
`
`
`ruuions will_become apparent fromtthe descriptioriof the
`
`
`whole specification and drawings.
`
`The
`
`liquid crystal
`
`display device
`
`having
`
` :utions can enhance the power consumption reduc
`
`irrespective of data.
`
`to be
`
`inputted.
`
`O
`
`consti
`
`
`
`
`e "iciency'
`
`such
`
`tion
`
` ther
`
`oi ouuional
`
`
`
`COI’IS
`
`COUS
`
`
`
`advantageous e
`
`
`
`
`
`
`"ects of
`
`the present
`
`invention will become
`
`
`
`apparent from the whole specification.
`
`
`
`
`
`
`
`
`
`
`
`
` %R fiE DfiSCR PT
`ON OF THj DRAW"
`
`NGS
`
`Fig.lii;aviewshowingoneembodimento:
`
`
`
`:aliquidcrystal
`
`display device according to the present invention, wherein a
`
`
`drive state O" a liquid crystal display panel and a backlight
`
`in a bright field and a dark
`
` field is shown;
`
`I)
`
`Fig. 2 is a block diagram showing a control circuit o;
`
`the liquid crystal display device according to the present
`
`invention;
`
`Fig.
`
`invention;
`
`3 is a view showing the constitution of a module
`
`
`
`
`o: the liquid crystal display device according to tie present
`
`
`Fig.4ii;aplanviewshowingoneembodimentcxfabackligh:
`
` o: the liquid crystal display device according to the present
`
`
`
`invention;
`
`
`
`
`
`
`
`Fig.5AandEWgL 5%areviews
`Sorexplaininganhs Hethod;
`
`
`Fig. 6A,:o Fig. 6C are views Ior explai
`
`ning one example
`
`
`
`
`or driving 0" she 'iquid crystal
`
`display device according to
`
`
`
`
`the present irvention;
`
`Fig."U&to Fig. 7C
`
`are views showingeacomparison.example
`
`which is compared with
`
`Fig. 8Atx>Fig. 8C
`
`which is compared with
`
`
`
`the present invention;
`
`are views showingeacomparison.example
`
`the present invention; and
`
`
`
`Fig.
`
`9A to Fig.
`
`9C views showing a comparison example
`
`which is compared with the present invention.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`DfiSCR PT ON OE
`THfi PRfiFfiRRfiD HM%OD MfiNflS
`
`
`
`Embodiments of the present invention are explained in
`
`conjunction with drawings. Here,
`
`in all embodiments and
`
`drawings,
`
`identical or similar constitutional elements are
`
`given same symbols, and their‘repeatedwexplanatioriis omitted.
`
`
`
` <Embodiment
`
`l>
`
`(Whole constitution)
`
`Fig.
`
`
`2 shows one embodiment o:
`
`the whole constitution
`
` o‘theliquidcrystaldispl
`
`
`aydeviceLDMaccordingtothepresent
`
`invention. As the liquid_crystal display device L
`
`3M,aaliquid
`
`crystal display device which is used in a lquid crystal
`
`
`
`televisionreceiverse:cn:thelikejjsexemp'iiied,forexample.
`
`
`
`
`In Fig. 2,
`
`
`
`
`
`the liquid crystal display device (module)
`
`
`
`
`
`LDM is constituted o: a liquid crystal display panel PNL,
`
`an
`
`
`optical sheet OS, a backlight 3L,
`
`
`
`a display control circuit
`
`(T-Con substrate) 100, a
`
`memory 110,
`
`and an inverter circuit
`
`
`
`
` QR-fimmm;apluralityo:
`
`120. Here,thebacklight'
`
`
`
`flightemitting
`
`diodes in a scattered_man
`
`’1er Ol’l a SUI:
`
`
`
`face thereo: which faces
`
`the liquid.crys:al display panel PNL in an opposedlnanner,
`
` for
`
`example.
`
`
`
`
`
`Further,
`
`Fig.
`
`130 which constitutes an external sys
`
`
`displaydeviceLD
`
`M. Theimageprocessinger
`
`
`
`
`
`2 also shows an image processing engine
`
`,em 0
`
`l the liguid.crystal
`
`ginelBOijsacirc
`
`Jit
`
`
`
`which generates
`
`image data
`
`
`for allowing the liquid crystal
`
`display device L
`
`
`
`DMiXJdisplayeuiimagejjiresponseiXJreceived
`
`broadcastingwav
`
`esonaliguidcrys
` Al though not shown in the drawing,
`
`circuit 100 includes a CPU, an input/output port and the like.
`
`the display control
`
`
`
`taltelevisionreceiverset.
`
`
`
`program_for gene
`
`rating display data
`
`
`
`tor per‘orming a display
`
`The memory 110 stores various programs including a display
`
`
`dcrystaldisplaypanelPNLbasedonimagedatainputted for
`
`mqaliqui
`
` from the image
`
`processing engine 130,
`
`and a program
`
`O
`
`
`
`
`respective light emitting
`
`controlling turning on and o
`
`
`
`diodes of the backlight 3L based.on the display data
`
`
`group o:
`
`the light emitting diodes.
`
` for‘every
`
` Further,
`
`the display control
`
`circuit 100
`
`inputs
`
`the
`
`generated display data to a scanning signa'
`
`drive circuit
`
`
`
`andzivideosignaldrivecircuitHeO'
`:theliquidcrystaldisp'ay
`
`panelPNLasaadisplaydrivesignalSS.
`
`Duetosuchanoperation,
`
`aninageiA;displayedcn1adisplayregiorZfiao
`
`
`ftheliguidcrystal
`
`
`
`display panel PNL.
`
`V
`
`
`
`Further,thedisplaycontrolcirCLitlOOcontrolst
`
`the light emitting diodes of
`
`
`
`the backlight
`
`
`
`
`
`O
`
`
`
`
`
`
`on/o
`
`an
`
`inverter circuit 190.
`
`emitting diodes
`
`Here,
`
`turning on/o
`
`of the light
`I)
`
`{I
`
`
`
`may be per‘ormed
`tor every group O'
`'igh'
`
`Jrning
`
` 3L Via
`
`
`
`
`
`
`
`emitting diodes based on the progran1stored in the memory 110.
`
`
`(Schematic constitution O" liquid crystal
`
`display panel PNL
`
`and backlight
`
`
`3L.)
`
`Fig.
`
`3 is an exploded plan view showing one embodiment
`
`
`of
`
`she liquid crystal
`
`
`
` of
`
`display panel PNL and the backlight
`
` 3L
`
`
`che liquid crystal display device LDM.
`
`The liquid crystal
`
`display panel PNL is arranged on a viewer’s side,
`
`and a sheet
`
`
`OSandahmcklightBLaresequentiallyarrangedbehindtheliquid
`
`crystal disp:
`
`_ay panel PNL.
`
`
`
`
`r1he
`
`liquid crystal
`
`display panel PNL is
`
`
`
` formed of
`
`an
`
`envelopewhichincj
`
`_udes a pair 0'
`
`
`:parallel—arrangedsubstrates
`
`
`
` SU? ? made o:
`SUQl,
`
`: glass,
`
` for example,
`
`and liquid crystal is
`
`
`
`sandwiched
`
`between
`
`these
`
`subs:rates
`
`
`SUBl,
`
`
`SU 32.
`
`On
`
`
`
`liquid-crystal—side surfaces o_
`
`she substrates
`
`
`
`
`SUQl, SU?7,
`
`
`
`pixels(notshownj11thedrawing)whicharearrangedj11anatrix
`
`array are
`
`
`formedusingtheliquidcrys
`
`:al ascnmaconstitutional
`
`
` forevery
`element,whereinopticaltransmissivi
`
`
`S are formed
`A region in which th s
`r sp ctiv pixo'
`
` pixel.
`
` :yiscontro' led
`
`
`
`is defined as a display region AR
`
`(a region surrounded by a
`
`chained-line
`
`frame in
`
`an image throagh ligh
`
`
`
`region AR.
`
`the drawing), andeaviewer can recognize
`
`
`
`
`a from the backlight
`
`
`3L in the display
`
`
`Ql
`
`The substrate SU'
`inc'udes,
`
`fromiflmastbstra
`
`
`
`forexanple,portionswhich
`
`
`
`:e SUB2 on_a left side and_an upper
`
`
`are exposed:
`
`
`
`side in the draw
`
`ing,
`
`
`
`
`
`
`
`and one side 0'
`"lexible
`' a plura
`lity O
`
`
`printed.circuit boards E
`3 is connected.to these portions.
`
`On
`
`these
`
`
` 3,
`flexible printed circuit boards F
`
`vi
`
`deo signal drive
`
`and
`
`scanning
`
`signal drive
`
`circuits V
`
`for
`
`circuits Be,
`
`
`
` r
`
`sp ctiv pix ls
`
`individual'y or independently driving th
`
`
`
`
`are formed.
`
`On the
`
`
`flexible printed circuit boards E
`
`3 which
`
`
`
`:anged to parallel to each other in the x direCtion in
`
`are ar,
`
`the dre
`
`
`
`
`
`:espec_ to the
`
`
`
`flexible printed circuit boards F
`
`wing, the video signal_drive circuit He is
`
` formed.
`
`With
`
`3 on which the
`
`video signal drive circuit;He is
`
`PC 31, PCB2 are(co
`
`
`formed,printedcircuitboards
`
`
`
`
`the
`inectedtoanothersideo
`"lexiblezprin
`
`ted
`
`
`
`flexiblejprinted
`
`
`
`the substrate SU
`
`fthe
`
`
`
`
`
`
`
`31 is conneCted.
`
`
`
`
`
`fromth
`
`edisplaycontrol
`
`circuit boards E
`
`3 opposite to one side 0:
`
`
`
`circui'
`
`
`: boards E
`
`3 to which
`
`VideosignalsareinputtedtOthepixels:
`
`circuit 100
`
`
`
`PC39.
`
`(see Fig. 2) via the printed circuit boards PC
`
` 31,
`
`
`r1the liquicicrystal displayrdevice<x
`
`thisembodiment,
`
`
`
`
`forexanple,twoprintedcircuitboardsPC
`
`
`C 3?arearranged.
`31, P
`
` : boards E3 which are
`
`
`
`Further, on the
`
` flexible printed circui'
`
`arrangedtniparalleljjitheEIdirectionij1flmadrawing,scanning
`
`signal drive circuit V is
`
`
`circuit boards E
`
`3 on which t
`
`formed.
`
`To the
`
` 1e scanning signa
`
`flexible printed
`
` 1 drive circuits
`
`V is formed,
`
`input signals
`
`
`from the display
`
`control circuit
`
`LOOareinputtedtothepixelsvialines(notshowninthedrawing)
`
`formed_on sur:
`
`
`
`faces 0:
`
`
`
`: the printed.circuit boards PC
`
` 3 l and the
`
`
`
`substrate SUI
`
` 3
`
`l.
`
`Printed circuit boards which correspond to
`
`10
`
`
`
`the printed circuit boards
`
`
`3 2 are not connected to
`LDCBl, PC'
`
`
`the W exib'
`
`e printed circuit boards E
`
`
`
`in the y direction.
`
`
`
`
`
`3 arranged in parallel
`
`
`On a back surface 0:
`
`
`
`the
`
`liquid crystal
`
`display panel
`
`PNL,
`
`OS
`
`the backlight
`
`
`
` formed 0 ,
`
`"or example,
`
`a di
`
`
`
`BL is arranged by way 0:
`
`
`
`
`”usion sheet,
`
`the optical sheet
`
`a prism sheet
`
`
`(niastackedbodyo:
`
`fthese sheets.
`
`
`The optical sheetCXSguides
`
`
`
`3L to the liquid crystal displayrpanel
`
` fromiflmabacklighti
`light:
`
`
`
`
`PNL a"
`oer diffusing or cordensing light.
`
` The backlight QR
`
`
`is
`
` formed by arranging a pltrality of
`
`
`
`
` an
`
`light emitting diodes L
`3 in a matrix array on a surface 0;
`
`
`
`
`
`insulation substrate
`%
`) which is arranged to
`
` face at least
`
`the display region AR o:
`
`
`
`: the liquid crys
`
`tal
`
`display panel PNL
`
`in an opposed manner.
`
`
`
`The plurality of
`'igh
`
`
`
`
`
`L3 are
`
`
`
`formed as a surface light source and the surface light
`
`t emitting diodes
`
`
`
`sourceradiateswhitelighttotheliquidcrystaldisplaypanel
`
`PNL side.
`
`Fig.
`
`4 shows the back light
`
`
`3L by only extracting the
`
`
`
`
`back light 3L from the liquid crystal
`display panel PNL.
`
`As
`
`shown in Fig. 4,
`
`the respective light emitting diodes LD are
`
`
`divided_into regions in which the light emitting diodes L3 are
`
`formed(indica'
`
`
`
` the light emit'
`
`:edbyadottedlineinthedrawing).
`
`Forexample,
`
`
`
`3 are divided_into l6 groups
`
`(4X4),
`
`O
`
`
`the respective light emitting diodes L3
`
`and turning on/o
`
`ting diodes L
`
`
`
`iscontrolledindeper
`
`dentlyforeverygroup.
`
`Thatis,assuming
`
`ll
`
`
`
`
`
`
`
`respective rows in
`
`as R1, R2, R3, R4
`
`the division 0:
`
`from above in the drawirg,
`
`and assuming
`
`
`light emitting diodes L3
`
`
`
`respective columns:nithe<division(x
`
`thelightemittingdiodes
`
`
`T
`
`
`LDasLT,19,13,14‘romale‘tsidein
`
`:hedrawing,therespective
`
` groups (Rl, Ll),
`light emitting diodes belong to any one 0:
`
`(R1, L2),
`
`(Rl, L3),
`
` (R4,L3),and(R4,L4).
`
`(Rl, L4),
`
`(R2,
`
`Ll),
`
`(R2, L2),
`
`...,
`
`(R4, L2),
`
`
`Dueix>suchconstitution,ii:ispossible
`
`to apply a turn—on control to the respective light emitting
`
`
`diodes L3 belonging to the group
`
`(R1,
`
`the same time,
`
`
`
`it is possible to apply a
`
`
`the respective light emitting diodes L )belonging'toiflmagroup
`
`L1) as a whole and, at
`
`
`CUl’n—O
`
`
`control
`to
`
`
`
`(R1, L1) as a whole when necessary.
`
`
`The same goes for the
`
`
`respective light emitting diodes L leelonging'to other groups
`
`(Rl, L2),
`
`I
`(Rl, L3),m (R4, L4).
`
`Although not shown in the drawing, on th
`
`
`
`
`
` %DO
`ditheinsulationsubStrate
`'Ethebacklighti
`
`control circuit 100,
`
`the memory 110 and an inve
`
`in Fig.
`
`2 are arranged.
`
`
`
`
`e back surface
`
`
`
`3L,thedisplay
`
`rter 120 shown
`
`
`
`
`Driving 0“
`liquid crystal disp'ay panel PNL
`
`I.
`
` %
`
`
`eBl
`(h4exib‘
`ack"nsertion)
`jhisembodimentadoptsanh'
`
`
`
`)
`
`
`method
`tor per‘orming display driving 0
`
`display panel
`
` RNL.
`
`the liquid cryStal
`
`
`
`lOO executes
`
`
`
`
`The display control circuit
`
`
` _%
`
`the image processing based.on the E
`
`method'us
`
`ing image data
`
`inputtedfromtheimageprocessingenginel30whi
`
`chconstitutes
`
`12
`
`
`
`
`
`
`
`an external systemJ Here,
`
`the summary o:
`
`
`
`
`the FB: method is
`
`explained.
`
`
`
`r1he
`liquid crystal
`display device is a holding-type
`
`display device which holds image data to be displayed until
`
`a next
`
`
`frame.
`
`Accordingly,
`
`in per-
`
`
`
`forming a motion picture
`
`display,
`
`so—called motion picture blurring
`
`(a phenomenon in
`
`which a
`
`be gener
`
`periphery o:
`
`
`
`a moving object is blurred) is liable to
`
`ated. Various coun'
`
`:ermeasures have been developed
`
`As
`
`a typical control
`
`for
`
`
`
`obviating'such.motion,pict
`
`ireiblurring.
`
`method,
`
`
`aso—calledtwo:
`
`Lod of 6OHZ is driven at l2OHz is named.
`vingeaper:
`
`foldspeeddrivecontrolwhereeadisp:
`I.
`
`_ay
`
`Jhe
`
`
`
`type 0:
`
`
`
`
`: such a two:
`fold speed drive control.
`
`method,aaperiod<flfeach:
`
`
`framecx
`
`
`
`: image data_input'
`
` frame ha
`
`
`J:'-§
`
`
`
`
`
`method is one
`
`
`_g
`
`Sutheh'
`
`:ed
`
` :em
`
`
`
`to the
`
`'iquid crys
`
`:al
`
`display panel from an external syS'
`
`Qrdividedjjitwo,
`
`
`
`
`:wo image data having di
`"erent grayscales which_are re:
`
`
`for example, thus
`
` forming
`
`
`
`ferred
`
`is time-
`
`sequential:
`
`
`
`:oasabright:
`
`
`
`
`fieldandadark:
`
`field,andcontinuouslyper: forming
`
`
`r
`
`jhat is,
`
`a display based on the image data.
`
`the image data
`
`
`from the external system is changed to image data having a
`
`graysca:
`
`externa:
`
`_e higher than a grays
`
` _ system in the bright
`
`cale 0:
`
`
`
`the image data
`
` from the
`
`
`field,
`
`and the image data
`
` from
`
`the external systeH1is changed.to image da'
`
`lower than
`
`the grayscale o:
`
`
`
`the image da
`
`
`
`:at
`
`avingeagrayscale
`
`ca from_Lhe external
`
`
`
`
`system_i
`
`
`n the dark field.
`
`To be more specific, the image data
`
`exhibits a characteristic that brightness is changed_on a low
`
`13
`
`
`
`
`grayscale side and a totally white display is performed on a
`
`
`high grayscale side in the bright field, and a charaCteristic
`
`that a totally black display is performed on a low grayscale
`
`
`
`
`
`
`side and.brightness is changed on a tigh grayscale side in the
`
`
`
`
`dark field. When the image data in the bright field and the
`
`image data in the dark field are integrated with respect to
`
`
`
`
`
`time, a display similar to the display having the grayscale
`
`
`of the image data from the external system is obtained (see
`
`
`
`
`
`
`
`
`
`
`r1hish'j methodcaneliminatemotionpictureb'urriqg
`
`
`
`with respect to the 3%
`
`
`
`method).
`
` without
`
`lowering display brightness.
`
`Fig. 5A:h3a_correlation_graph showing the relationship
`
`
`between the grayscale G of the image data (taken on an axis
`
`
`
`o:abscissas)andbrightnessESwhichtheliquidcrystaldisplay
`
`
`panel PNL displays (taken on an axis of ordinates).
`
`
`
`In the graph, symbolilindicates a characteristic of the
`
`
`image data outputted from.the external system.
`
`Symbols a and
`
`
`B respeCtively indicate a characteristic 0: the image data in
`
`
`
`the bright field.and.a characteristic 0: the image data in the
`
`
`
`
`
`dark field obtained by processing using the E% method.
`
`
`
`
`
` The display control circuit 100 converts the grayscale
`
`
`
`of the image data inputted_fronlthe external systenlhaving'the
`
`
`
`characteristic y into the grayscale o: the image data in the
`
`
`
`
`
`bright field.(characteristic a) and the grayscale of the image
`
`14
`
`
`
`
`data in the dark field
`
`(characteristic B)
`
`I
`
`and outputs the
`
`image da
`
`s8.
`
` of
`
`these grayscales to the liquid crystai
`
`display
`
`
`
`panelPNLasvideosignalswhichconstitutedisplaydrivesignais
`
`SS.
`
`Fig.
`
` ar
`
`53 shows one example of
`
`image which is subject
`
`to the grayscale conversion based on
`
`the F
`
`3L method.
`
`A_graph
`
`on an upper part 0:
`
`
`
`system w
`
`ith respeC'
`
`
`
`
`Fig. 53 shows input data
`
`
`from the external
`
`to a certain pixel,
`
`wherein time
`
` CU
`
`is
`
`
`
`taken on an axis 0: abscissas and grayscale (G)
`
`is taken on
`
`
`
`
`
`anaxisofordinates. AgraphonalowerpartofFig.5?indicates
`
`
`
`
`
`display data outputted to the liquid crystal display panel ?NL
`
`
`
`after being processed by the F% method.
`
`
`In this example, as shown in the graph on the upper part
`
`
`
`
`
`of Fig. 5?, assume that the image data is inputted in order
`
`of the data A having the low grayscale,
`
`
`the data 3 having the
`
`
`
`highgrayscaleandthedataChavingtheintermediategrayscale.
`
`
`
`The input data in Fig. 53 is given the same symbols used in
`
`Fig. 5A.
`
`
`
`in the processing based on the FB: method,
`
`
`1 frame (F)
`
`
`
`
`
`of the inputted.image data is divided into 9 fields “f” With
`
`.2 II
`
`
`
`fields“
`respectiXthodivided'
`
`,thevideosignalinthebright
`
`
`fieldwhosecharacteristicisconvertedin'
`
`:othecharacteristic
`
`a in Fig
`
`5A is displayed in the
`
`
`
`"irsL "ield a,
`
`and a video
`
`
`
`signaljjithe<dark:
`
`
`
`fiebiwhosecharacteristicji;convertedinto
`
`the char
`
`acteristic B is displayed in the next
`
`
`field B.
`
`15
`
`
`
`
`indicated:hithe lower part o:
`
`fFig.5i
`
`
`
`
`a for ,he bright
`
`grayscale to be outputted in the
`
`
`
`
`frame as the display data,
`
` O'I"
`
`'ield B
`
`3i1;output' and
`
`For example, with respect
`
`to data A,
`
`the input data
`
`(characteristic‘fl is data.having the low grayscale and.hence,
`
`according to the correlation graph shown in Fig.
`
`5A,
`
`
`characteristic a for the bri
`
`ght
`
`
`frame exhibits brightness
`
`t 1e
`
`":0
`
`{
`
`
`frameexhibits
`
`
`someextent,andthecharacteristichorthedar
`
`
`brightness of
`
`O.
`
`Accordingly,
`
`tr
`
`
`e
` O
`e graysca'
`
`a degree
`
`:edfjithe field
`
`
`
`the display
`
`becomes 0.
`
`
`In the same manner,
`
`with respect
`
` :3,
`
`the
`
`input data (characteristiC'w exhibits the maximum grayscale
`
`
`
`he dark frame
`
` to data
`
`
`
`and hence,
`
`the display data is outputted wi
`
`
`"ie
`the
`grayscale in both o_
`
`
`
`:h the maximum
`
`
`frame and the
`
`ld a
`for the brigh
`
`
`
`
`field_B'%N‘the dark.frame.
`
`With.respect to data.C, input data
`
`(characteristic y)
`
`exhibits the intermediate grayscale and
`
`hence, display data.is outputtediflith.grayscale corresponding
`
`
`to the characteristic a in the _:_ie ld a
`for the bright
`
` frame
`
`the
`
`
`
`and with grayscale corresponding to the characteristic B in
`
`
`O'I"
`
`
`she dark
`field B
`
`
`frame respectively.
`
`In this manner,
`
`with respect to each
`
`
`frame F in which
`
`the ima
`
`
`ge data_is inputted, the characteristic of the input'
`
`image data is converted into the bright
`
`
`field_characteris
`
`:ed
`
`:ic
`
`
`
`
`
`a and the dark
`field characteristic B de:
`
`
`fined in Fig.
`
`5A and
`
`hence,
`
`the bright
`
`
`field and the dark
`
`
`field are alternately
`
`displayed CH1
`
`the
`
`liquid crystal display panel
`
`PNL.
`
` 3y
`
`16
`
`
`
`
` fiel
`
`integrating the image data 0'
`:bright
`
`d and the image data
`
` 0:
`f the dark
`field with respect to time,
`
`t
`
`
`: the
`he brightness 0:
`
`integrated image data to be displayed becomes substantially
`
`equalix>thebrightnesso:
`
`
`fimage<kflxihavingiflxacharacteristic
`
`y. Withsuchprocessingoftheimagedata,datacanbedisplayed
`
`
`at a twofold speed WithOLt lowerirg'brightress thus reducing
`
`
`
`
`
`motion picture blurring. Data on the correlation graph shown
`
`
`
`
`
`.0 and.isi,sedkmrthe display
`
`
`
`
`
` jlprocessing.
`timeo
`pe
`"ormingthehi
`
` the grayscales G
`
`andiflxabrightnesses
`
`j11Figu 5Aifi;storedjjitheinemorylfl
`
`controlcircuithOatthe
`
`jhe relationship>between
`
` 3
`
` O
`
`the respective characteristics is not limited to values
`
`described in the correlation graph showr
`
`relationship may be corrected correspor
`
`in Fig. 5A, and the
`
`ding to the display
`
`characteristic provided
`
`that the bright
`
`frame characteristic
`
`and the dark
`
`
`frame characteristic are maintained.
`
`
`In this embodimen
`
`"I
`
`the two
`
`fold
`
`speed control which
`
`
`
`
`
`changes the period o:
`
`
`
`: the display
`
`
`
`frame to l2OHz is per:
`
`formed
`
`by the display control circuit 100.
`
`
`Image data 0:
`
` fthe display Lch
`
`from the image processing engine 130 wh:
`
`
` frame
`is inputted
`
`
`
`consti
`
`
`
`:utes the eXternal system.at a period of 6OHz,
`
`and the
`
`displaycontrolcircuitlOOtime-sequentiallydivides(copies)
`
`the image<datai11two, andiflxarespectivetgrayscale in:
`
`
`
`formation
`
`are converted_ir to grayscale information
`
`
`
`"orthedark:
`andgrayscalein "ormation
`
`
`
`fiel
`
`
`for the bright field
`
`dsozxstoalternately
`
`
`
`
`per:form_a display thus enabling the display at the period o:
`
`
`
`17
`
`
`
`
`
`LZOHZ substantially.
`
`However,
`
`the present invention
`
`is not
`
`limitediXDsucham1embodiment.
`
`
`twofold speed control 0'
`
`That is, even.wher1a so—called
`
`'a frame interpolatiorlmethodj11which
`
`
`
`
`
`the image processing engine l30 prepares image data which
`
`
`
`
`
`performsinterpolationbetweenimagedatacxfthedisplay
`
` frames
`
`havingtheperiodo:
`
`f6OHzbycalculationandoutputsthedisplay
`
`
`
`
`
`is performed,
`frame having the period c" lZOH
`
`the present
`
`
`invention is applicable to such a two:
`
`fold speed control.
`
`
`In
`
`this case,
`
`the display control circuit 100,
`
`without dividing
`
`
`
`image data inputted.fron1the image processing engine 130 based
`
`on the characteristic defined by Fig.
`
`
`from
`image data inputted-
`
`the image processing engine 130 into
`
`5A, directly converts
`
`
`
`frame or into the image in the dark
`
`the image in the bright
`
`
`
`
`
`frame in order of inputting thus alternately displaying the
`
`bright
`
`
`
`frame and the dark frame.
`
`
`(Driving of backlight BL)
`
`
`
`
`Thisembodimentadopts,aseadrivenethodxifthebackligh'
`
`
`
`
`3L, a local dimming method which divides a plura—
`igh'
`
` ity 0'
`
`
`
`(I
`
`(I
`
`
`
`
`
`emitting diodes L3 into a plurality of grOLps and controls
`
`
`
`
`
`turning on/o"" 0" light
`
`
`
`emitting diodes L3 for every
`
`
`
`
`To be more specifi
`
`c,
`
`a light emitting quantity
`
`
`
`
`
`lightemittingdiodesTL Do feverygroupisadjustedincon:
`
`
`Jaofvideosignalsinputtedto
`
`with.average<grayscale<da
`
`
`
`
`
`oftheliquidcrystaldisp'
`
`aypanelPNLinaregionwhichoverlaps
`
`18
`
`group.
`
`
`of the
`
`
`
`formity
`
`pixels
`
`
`
`
`withthelightemittingdiodesLDofeachgroup. Alightemittiqg
`
`
`
`quantity of the light emittirg diodes L3 can be finely set.
`
`For example, whenaacontroli£;nade withauiadjustment.quantity
`
`
`
`
`
`oflllbits, the light emitting quantityrcan.be obtained at 1024
`
`
`Stages. GrayscaledatacxfavideosignalinputtedJXDtheliquid
`
`
`
`crystal display panel PNL is controlled at 8 bits or 10 bits
`
`usually and hence,
`
`
`the grayscale o: the light emitting diodes
`
`
`
`
`
`the light
`
` L3 can be controlled substantially at the same level as the
`
`liquid crystal disp'ay panel PNL. Accordingly,
`
`
`
`
`emitting'quantity<)"uhe 'ight emitting diodes LDCXHlbe finely
`
`
`
`
`
`
`
`
`
`
`adjusted for every area thus increasing contrast of an image
`
`
`
`which_can.be displayeclby the liquid crystal displayrpanel PNL.
`
`
`
`r1he liquid crystal display device 0: this embodiment,
`
`as described above,
`
`in the liquid crystal display panel PNL,
`
`
`converts the grayscale o:
`
`
`the image data inputted from the
`
`external system, and divides each frame into the bright field
`
`
`
`
`andthedarkfieldJ Thedarkfieldisthefieldwhichcorresponds
`
`to the characteristic B shown in Fig. 5A, and exhibits low
`
`brightness compared.to the characteristiC'yat all grayscales,
`
`
`
`and the dark field often exhibits the brightness which is
`
`substantially O or close to O on the lower grayscale side as
`
`shown in the drawing.
`
`
`
`lnthisembodimentwhichrepeatsthedisplayofthebright
`
`
`
`field and the dark field,
`
`
`the number of pixels whose display
`
`grayscales become 0
`
`in the liquid crystal display panel PNL
`
`l9
`
`
`
`is inevitably increased. Accordingly,
`
`it is possible to
`
`
`
`increase the11umber<xfthe light emittingwdiodes LDTXDbe':Jrned
`
`
`
`
`
`
`
`
`
`and the number 0" turn—o
`Limes 0: such light emittiqg
`
`o
`
`
`
`diodes LD thus reducing power consumption 0: the backlight 3L
`
`
`
`
`
`
`
`
`
`more e "iciently.
`
`Here, Fig.
`
`
`
`1 shows an exanple of a state of the bright
`
`
`
`
`
`
`field (Fig. 1(a)) and a state of a bright field (Fig.
`l(b))
`
`with respect to the liquid crystal display panel PNL and the
`
`
`backlight 3L as a wqole.
`
`
`
`
`Cflmabacklightifi;includes, asshownij1FLg3,eaplurality
`
`
`oflightemittingdiodesll)whidjisarrangedij1amatrixarray,
`
`
`
`
`
`andtherespectivelightemittingdiodesILDhaveturningon/o
`
`
`
`:hereo: independently controlled_for every group.
`
`
`
`"n Fig.’,
` :herespectivelightemittingdiodesarenotshowninthedrawing,
`
`
`
`and groups (Rl, Ll),
`
`(Rl, L2),
`
`(Rl, L3),
`
`(Rl, L4),
`
`(R2, Ll),
`
`(R2,L2),m,(R4,L2),(R4,L3),(R4,L4)whichpartitionregions
`
`in_which_the respective light emitting diodes are arranged are
`
`shown. Further,
`
`the liquid crystal display panel PNL has the
`
`display
`
`region
`
`AR
`
`
`thereof partitioned
`
`into
`
`regions
`
`corresponding to (overlapping with) the respective groups 0;
`
`
`the backlight 3L by a dotted line.
`
`
`in the display region AR_of the liquid crystal
`
`
`image data inpuoted from
`
`explanation,
`
`the image data is described by taking an image
`
`20
`
`Further,
`
`display panel PNL shown in Fig. 1,
`
`the external
`
`system.
`
`is displayed.
`
`To
`
`
`
`facilitate the
`
`
`
`
`
`
`
`
`inwhichbrightnessij;lowataale‘tlowerportion(yrthedisplay
`
`region AR and the brightness is high at a right upper portion
`
`0: the display region AR as an example. Furtr er,
`
`
`
`although.the brightness is changed.fron1the lei
`
`
`
`
`totherightupperportionofthedisplayregionA'
`
`slowerportion
`
` Rijiastep-like
`
`in Fig. l,
`
`manner,
`
`in an actual operation,
`
`a gradation
`
`display which
`
`graduallyincreasesbrightnessij1anon-stepnannerisassumed.
`
`
`
`
`Here, to ‘aci'itate the understanding of the explanation, the
`
`
`
`
`display grayscale within the region 0: each group is averaged.
`
`As shown in Fig. 1(a) and Fig.
`
`l(b), a
`
`light emitting
`
`
`quantity 0:
`
`
`the light emitting diodes in every group of the
`
`
`
`
`backlightELiscontrolledcorrespondingtoaraveragegrayscale
`
`
`
`0: every group o:
`
`the liquid crystal disp'ay
`
`panel PNL.
`
`
`
`Forexample,iJIthedisplayofijxadarkSieldwrrtheliquid
`
`
`
`crystal display panel PNL shown in Fig. l(b),
`
`other than groups (L3, Rl),
`
`(L4, Rl),
`
`(L4, R?) o
`
`in the regions
`
` 'Ethelbacklight
`
`
`
`3L, a video signal to regions of the liquid crystal display
`
`
`
`panel PNL corresponding to the regions of the backlight 3L has
`
`
`
`O and hence,
`
`the light emitting diodes are
`
`
`the grayscale o:
`
`
`
`
`
`
`
`:urned.o
`
`
`
`. The light emitting diodes belonging to the groups
`
`(L3, Rl),
`
`(L4, R’),
`
`(L4, R?) are turned on corresponding to
`
`
`
`videosignalstotheregionso‘theliquidcrystaldisplaypanel
`
`PNL corresponding to the grOLps (L3, R’),
`
`(L4,
`
`Rl),
`
`(L4, R2).
`
`
`
`
`
`The manner or operation 0“ the 'iquid crystal display
`
`
`device of this embodiment
`
`is explained in detail and more
`
`2l
`
`
`
`
`
`
`specifically by taking one pixel as an example hereinafter.
`
`Fig. 6A to Fig.
`
`6C are directed to one arbitrary pixel
`
`
`of the liquid crystal di
`
`splay paqel PNL, wherein Fig.
`
`6A is
`
`a graph showing a grayscale
`
`(G) of a video signal supplied to
`
`
`
`the liquid crystal display panel PNL
`
`
`from the display control
`
`circuit 100, Fig.
`
` 63 is a gre
`
`ph showing brightness (turn—on
`
`state)
`
`
`
`
`
`("L) of the light emitting diode L) which corresponds
`
`to (or overlaps with) thejpixel, and Fig. 6C is a<graph_showing
`
`
`
`
`grayscale (G) 0:
`
`image data outputted to the display control
`
`
`
`Ln the
`circuit 100 from the image processing engine 130.
`
`I]
`
`oWO
`
`
`came periods are taken on an axis or
`
`
`
`respeCtive graphs,
`
`abscissas, wherein
`
`
`
`
`and_time fron1t2 to
`L4 formseanexu frame.
`
`beginning fra
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