United States Patent [191
`Kim ct al.
`
`[II] Patcnt Number:
`[45J Date of l'atcnt:
`
`111111111111111111111111111
`
`1111111111111111111
`
`5,805,128
`Scpo 8, 1998
`
`[54] LIQUIIJ CRYSTAL I)ISI'IA Y nEVI CE
`
`[75]
`
`Inventors: Uong-Gyu Kim, Suwon-si; Sang-Soo
`Kim , Scoul, both of Rep. of Korea
`
`[73] Assignee: Samsu ng Eh..'Clro nics C u., Lid.,
`Kyungki-do, Rep. of Korea
`
`[2 1] AppJ. No.: 702,158
`
`[22J Filed:
`
`Aug. 23, 1996
`
`[30]
`
`Foreign Appliclltion Priority Data
`
`[KRI
`
`Rep. of Korea ...................... 95-26166
`
`Aug. 23, 1995
`Inl. Cl.6
`.......................................... G09G 3/30
`[51]
`[52] U.S. Cl. ................................................. 345/96; 345/92
`]58] Field of Search .................................. 345/50, 54,55,
`345/58,87,89, 94, 96, 93, 100, 103, 92
`
`1561
`
`Rdcll.'m:cs Cill'll
`u.s. PAT ENT DOCUMENTS
`6/1989 Yasuda fl al. .......................... 345/107
`4,842,37]
`5,250,937 10/1993 Kikuo N al. .............................. 345{89
`
`Prilllllry Examiner--Mllubew Luu
`AI/Qrlley, Agent, or Firm-Cushman Darby&Cushman II'
`Group of Pi llsbury Madison & SUlfO LLP
`l57]
`ABSTRACr
`
`A liquid crYSlal display device includes a pluralilY of pixels
`arrayed in a matrix, and a plurality of data driver.; for
`transmitting a video signal to the pixels. Pixels in the same
`row receive the video signal from one of the data driver.>,
`while pixels in the adjacent row receive the signal having an
`oppositc data polarity with rcspect to tbe same gray level
`from a dillerenl data driver.
`
`3 Claims, 3 Dnlwlng SIIl't'fs
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`SHARP EXHIBIT 1006
`Page 1 of 6
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`

`

`u.s. Patent
`
`Sep. 8, 1998
`
`Sheet I of 3
`
`5,805,128
`
`FI G. 1 ( Prior Art)
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`Page 2 of 6
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`

`

`u.s. Patent
`
`Sep. 8, 1998
`
`Sheet 2 of 3
`
`5,805,128
`
`FI G.3 (Prior Art)
`
`FI G.4 (Pri or Art)
`
`FI G.S
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`Page 3 of 6
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`

`

`u.s. Patent
`
`Sep. 8, 1998
`
`Sheet 3 of 3
`
`5,805,128
`
`Vd
`
`vcom--/
`
`FIG.6
`
`FIG.7
`
`vcom-;l~--------\~V~7~7Z2727~7~1~/-------Vd
`
`FIG .8
`
`vcom~ /
`
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`
`FIG.9
`
`vcom-,l-+12727S7Z272726~\~~~~~-_-~-7+1=======Vd
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`Page 4 of 6
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`

`

`5,805,128
`
`"
`
`1
`LlQUIJ) CRYSTAL DlSI' I.AY n EVIO:
`
`BACKGROUND OF THE INVENTION
`
`2
`In this conventional drive method, the polarity of the data
`voltage (Yd) !Supplied to each adjacent row of pixels 6
`should be opposi te. ·Ibat is. the polarity of the data voltages
`corre~ponding to black and white da ta is reversed for each
`I. Field of Ihc Invention
`adjacent row of pixels 6. ·Iberefore, as shown in FIG. 3,
`111(; prescnt invention relates \0 a liquid crystal display
`according 10 a conventional operation, the common elec(cid:173)
`(LC D) device, and more particularly, \0 a liquid crystal
`trode voltage (Yoom) suppl ied to common electrode has an
`display using a gate line inversion driving technique which
`inverse waveform to thai o f the data voltage (Yd) represent·
`rcdU L-es horizonlal crosstalk alld power consumption.
`ing black data suppl ied to a column of pixels.
`Th is gate line inversion drive operation is more com(cid:173)
`2. Description of Ihe Related Art
`monly used than a frame inversion drive operation because
`M any dev ices ll'le liq uid crystal displays. such as portable
`it ealL')eS les~ flickering of the display. However, the con(cid:173)
`personal compu ters. These dcviccs optimally include com(cid:173)
`ventional drive method described above suffers from the
`ponents which consume as lillie power as possible, so Iha1
`following problems.
`Ihey can be llscd as long as po~ib\e per bancry charge.
`As illustrated in FIG. 3, the common electrode voltage
`Conventiona l liquid crystal displays commonly require 15
`(Yeorn) swings in opposile direclion of the da ta vollage (Yd)
`high voltage drive les, which in lum require high power
`when the data voltage (Vd) applied by the data drivers 8 and
`consumption. "Ibis inhibits their use in such devices as
`12 i<; black data. However, the common electrode voltage
`portable compulers, because of their drawback in causing a
`(Yeom) is deflected toward the da ta VOltage (Yd) due to the
`short du ration of usage per banery charge. 'Iberefore, it is
`desi rable to use low voltage ICs in the range of 5 V or less 20 ea·ecls of the data vohage (Vd) and capacitive coupling,
`thereby generating an RC.typc delay in the common elec·
`in liquid crystal displays. ' Ibese compone tliS also enjoy other
`trode voltage (Vcom).
`advantages such as easier fabrication and lower price as
`Meanwhile, when the data voltage ( Vd) of the data drivers
`compared 10 high voltage drive ICs.
`8 and 12 represents white data, as illuslratcd in FIG. 4, the
`A conventional liquid crystal display, in general, includes:
`25 common electrode vollage (Voom) swings correspondingly
`a thin-film transistor (Tr-T) board, wherein a plurality of
`the data vollage (Vd). In Ihis case, the common e lectrode
`pixel units, each including a thin-fi lm lransistor, a pixel
`voltage (Vcom) is deflected toward the d<1ta voltage (Vd)
`elcclrode, and storage capacitors, arc arrayed in matrix form,
`due to the eacct of the data voltage (Vd) and the capacitive
`and wherein gate lines and data lines arc respectively
`coupling, thereby generating a resistance delay in the com-
`provided along each row and column of pixels; a color filter
`M) mon electrode voltage (Vcom).
`plate formed by a color filler and a common electrode; and
`Moreover, the relative dielectric constant of the liquid
`liquid crystal materia.! which is infused into the space
`crystal maleriai increases in proportion to the voltage dif(cid:173)
`between the thin-film transistor board and the color filter
`ference between data voltage (Vd) and common e lectrode
`plale.
`voltage (Vcom), thereby resulting in a d ifference in eapaci.
`FIG. I illustrates an equivalent circu it diagram of one
`tive coupling between that arising rrom the transmission of
`pixel accordi ng to a conventional liquid crystal display. A" 35
`black data and that from white data. lbis is the major cause
`shown, a liqu id crystal capacilOr (C,J is formed by a
`of horizontal crosstalk occurring during the inversion drive
`common electrode 2 of a color fi lter plate, a pixel e lectrode
`of the gate lines.
`of a Ihin-film transistor 5, and the liquid crystal malerial (not
`shown) infused into the space therebetween.
`SUMMARY OF HIE [NVENTION
`·Ibe liquid crysta! capacitor (C,,,) is connected between a 40
`It i~, therefore, an object of the present invention to
`drain electrode 52 of thin-film transistor 5 and the common
`provide a liquid crystal display device that can eliminate
`electrode 2 . Source electrode 51 of thin-film transistor 5 is
`horizontal crosstalk in a display using a gate-line inversion
`connec!ed with data line 4 and gate electrode 53 is connected
`drive tcchnique.
`with gate li ne 3 .
`It is a funher object of the prescnt invention to provide a
`One end of a storage capacitor (C$) is connected to a drain
`liquid crystal device wh ich requires a d ri vi ng voltage lower
`electrode 52 of the thin-fi lm transistor 5 . Furthermore, a
`than 5 V to effect a reduced power consumption.
`capacitor (CdJ is fomlCd between the common electrode 2
`In order to achieve these and o ther objects, an embodi(cid:173)
`of the color filler and the data line 4 of the thin-film transistor
`ment according to the present invention includes a plurality
`5 having liquid crystal as a medium therebetween.
`50 of pixels arrayed in a matrix, and a plurality of data drivers
`[n a conventional LC D as illustrated in FIG. 2, pixels 6 in
`for Transmitting a video signa110 the pixels, wherein pixels
`the same row arc commonly connected with a gate driver 16
`in the same row receive Ihe video signal from one of the data
`through gale line 3, while pixels 6 in the same column arc
`drivers, while pixels in the adja(,:ent row receive the signal
`commonly connected with data drivers 8 and 12 through
`from a difterent data driver.
`data line 4 . lbe two data drivers 8 and 12, however, are 55
`oppositely arranged such that the first data driver 8 is
`connected with tbe pixels of each jth (j ... I, 3,5, ... ) column
`and the second data driver 12 is connected with the pixels of
`each (j+ I)th column.
`The conventional LCD device described above operates t;O
`~s follows, with reference 10 FIr.. 3 and FI r. . 4
`A gate driver 16 tra n!Smits gate voltage to each gate line
`3 in a oonsccmive manner such that a data voltage can be
`seloctive1y applied to each of the pixels 6 in each row one
`by one in order. 'Iben, the data drivers 8 and 12 transmit the 65
`data voltage to the pixels 6 in each row in accordance to the
`operation of the gate driver 16.
`
`BRIEF IJ ESCRIP'n ON OF THE DRAWINGS
`Th ese and other advantages of the present invention will
`become better understood by the following delailcd descrip.
`tion taken in conjunction with the accompanying drawings
`in which:
`FIG. I shows an equivalent circuit diagram of one pixel
`in a conventional liquid crystal display device;
`FIG. 2 is a circuit diagram illustraling an array of pixels
`in a conventional liquid crystal display device;
`FIG. 3 illustrates a data voltage waveform representing
`black data applied in the conventiona l device illustrated in
`FIG. 2 ;
`
`Page 5 of 6
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`

`

`5,805,128
`
`3
`FIG . 4 illustrates a dala voltage waveform representing
`while data applied in the coovenliooai device illuSIf3tcu in
`FIG. 2;
`FIG. 5 is a circuit diagram illustrating an array of pixels
`of an embodiment of a liquid cry.';.lai display device accord(cid:173)
`ing to the present invention;
`FIG. 6 illustrates a data vOllage waveform rcprcscnling
`black dala applied by the first data driver in the device of
`FIG. 5;
`FIG. 7 illustrates a data voltage waveform representing
`while data applied by the first data driver in lhe device of
`FIG . 5;
`FIG. 8 illustrates a data voltage waveform representing
`black dall applied by the second dala driver in the device of
`FIG. 5; and
`FIG. 9 illustrate!:; a dala voltage waveform rcpresc[J\ing
`while dala applied by the second dala driver in Ihe devil'C of
`FIG. 5.
`
`DETAILED DESCRIPTIO N OF TIlE
`PREFERRED EMBODI MENTS
`
`With reference to the annexed drawing.'>, a preferred
`embodiment of the present invention will now be described
`in detail as follows.
`FIG . 5 is a circuit diagram of an embodiment of a liquid
`crystal display according to lhe present invel1lion. As shown,
`the display indudes: an array of pixels 6 arranged in a matrix
`form of rows and columns; a gnte linc driver connected 10 Ml
`gate lines 3 , each of which is commonly connected 10 all
`pixels in ilS corresponding row; a lilSt data driver 8 con(cid:173)
`nected with first data lines 10, each of which is commonly
`connected to the ith (i .. l, 3, 5,. .) row of pixels in its
`corres(Xlnding column; a sccond data driver 12 connected 35
`with second data lines 14, each of which is commonly
`connected to the (i+ l)th row of pixels in ilS corresponding
`column.
`·10 drive the liquid crystal display device as described
`above, only the polarity of the common elcctrode vohage 40
`applicd 10 cach row muS! be inverted, and not that of the data
`voltage, as required in Ihe conventional display.
`[0 accordance with a gate drive signal generated by the
`gate driver 16, a video signal from the corresponding data
`driver is applied to a relevant pixel. For example, when a 45
`video signal is applied from the first data driver 8 through
`the first data line 10 to a pixel in the first row, the common
`electrode voltage (Ycom) is in the lowest state, 0 Y, and the
`video signal vohage (Vd) is in lhe range of 0-5 Y. Further,
`when a video signa! relevant to a pixel in the SC(.:t)nd row is so
`transferred from the second clala driver 12 10 the pixel
`through the second data line 14, the common electrode
`voltage (Ycom) is in the highest state, 5 Y, and the video
`signa! voltage (Yd) is in the range of 0-5 Y.
`[0 this manner, each pixel in a row is driven one at a time,
`whih.: llil,; fID:it ual~ .!rivl,:r ~ I IU Ihl,; 1iI,:cuml uilta drivl,:r g,I,;III,;rall,;
`data signals having opposite polarity from each other with
`respect to the same gray level.
`
`4
`As illustrated in FIG. 6 and FIG . 7, the gray level voltage
`corresponding to black and white data, respectively, as
`applied by the first data driver, is higher than that of the
`common electrode vohage (Vcorn) and ilS range is between
`OYand5Y.
`As further mustrated in FIG. 8 and FIG. 9, the gray level
`voltage corresponding to black and white data, respectively,
`as applied by the second data driver, is lower than thaI of the
`common electrode voltage (Ycom) and il~ range is between
`to 0 Y a nd 5 Y.
`Accordingly, the data drivers 8 and 12 in the present
`invention transmit data voltage to the pixeh in a stable
`manner, without requiring inversion as in the conventional
`display. Therefore, the common VOltage (Ycom) can be
`IS protected frolll fluctuating up or down and the occurrence of
`horizontal crosstalk can be reduced 10 a minimum, even
`when using the gate line inversion driving method.
`Furthermore, the display according 10 the prescnl invention
`can employ a low voltage data driver requiring driving
`20 voltages less than 5 Y, thereby reducing power consumption.
`Although the present invention has been herein described
`with reference to the preferred embodiment thereof, those
`skilled in the art will readily appreciate that various modi(cid:173)
`fications and substitutions can be made thereto, without
`25 departing from the spirit and scope of the invention as set
`forth in the appended claims.
`We claim·
`l. A liquid crystal display comprising:
`a plurality of gate lines which are connected to a gate
`driver and which include odd gate lines and even gale
`lineS;
`a plurality of first data lines which are connected to a rust
`source driver and which are separated from each other;
`a plurality of second data lines which arc connected to a
`second source driver and which are arranged parallel to
`t he first data lines;
`a plurality of thin film transistors, each connected to one
`of the gate lines and one of the first and the second data
`lines; and
`a plurality of pixel electrodes, each con.nccled to one of
`the thin film transistors and formed in an area defined
`by the gate lines and the first or the second data lines;
`wherein one of the first data lines is adjacent to a lirst side
`of the pixel clectrooe and one of second data lines is
`adjacent to a SC(.:t)nd side of the pixel electrode op(Xlsite
`t he first side, and wherein the odd gate lines are
`connected only \0 the thin film transistors connected to
`the first data lines and the even gate lines are connected
`only to the thin fIlm transistors connected to the second
`data lines.
`2. n c liquid crystal display according to claim 1, wherein
`signa Is transmined by the first data lines arc of opposite
`polarity to signals transmitted by the sccond data lines.
`3. lbc liquid crysta l display of claim 2, wherein the
`55 polarities of signals transmilled by the first and the second
`data lilies vary periwically.
`
`• •
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`Page 6 of 6
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