201123155 , I VVHUJO厂rt 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種液晶顯示器驅動方法，且特別是 有關於一種可用以提升線反轉（Line inversi〇n)液晶顯示 态之顯示品質之驅動方法。 【先前技術】 在科技發展日新月異的現今時代中，極性反轉201123155 , I VVHUJO factory rt VI. Description of the invention: [Technical field of the invention] The present invention relates to a liquid crystal display driving method, and in particular to a line inversible liquid crystal display state The driving method of display quality. [Prior Art] Polarity reversal in the current era of rapid technological development
(Inversion)之驅動方法係已存在，並已廣泛地應用在液 晶顯示器中。以列反轉（R〇w Inversi〇n)驅動方法之一個 例子來說，共同電壓（c〇mm〇n v〇ltage)為固定之參考電 ，，位準尚於共同電壓之第一晝素電壓及位準低於共同電 壓之第二晝素電壓分別驅動液晶顯示器中之奇數序及偶 數序晝素列。其中第一畫素電壓與共同電壓之差值等於共 同電壓與第二畫素電壓之差值，以顯示均勻之影像晝面^ 相…、而在實際情形中，共同電壓之位準會應為諸多非理 心原因產生偏移，如此，將使得第一晝素電壓與共同電壓 =差值不等於共同電壓與第二晝素電壓之差值。這樣一 ，一相同圖框晝面中各晝素列顯示的亮度為不均勻，導致 顯示晝面產生亮暗橫紋。另外因相鄰圖框畫面之顯示亮度 亦不均勻，導致顯示畫面產生閃爍之問題（Flicker)。 傳先上，係透過點反轉（Dot Inversi〇n)驅 =列反轉驅動方法之種種畫面顯示問題。然而，傳統點 旦f驅動方法具有掃描電壓與資料電壓之位準較高、耗電 里1^及_電路之設計複雜度較高之缺點。 201123155 【發明内容】 '’ 本發明係有關於-種液晶顯示器及其驅動方法，相較 於傳統列反轉（R0W Inversi〇n)驅動方法，本發明相關之 液晶顯示器及其驅動方法可提供較佳之畫面顯示效果。相 較於傳統點反轉（Dot lnversi0n)驅動方法，本發明相關 之液晶m及其軸方法具有耗f量較低及驅動電路 之設計複雜度較低之優點。 根據本發明提出-種液晶顯示器，用以在第一圖框 Frame)期間中包括液晶顯示面板、掃描驅動器⑼如 此1·)。液晶顯示面板具有多個畫素列。掃 =動：用以在第一圖框期間中之第一掃描期間中產生 以產生交流共第;產生電路用 他缶咕 弟知搖期間中由第一位準切 期間-及第二子掃描 序資料分別驅動第一畫素列上之多個奇2=多== =第-子掃描期間中提供多筆偶數序資料分別驅 旦素列上之多個偶數序畫素， 胃,+動第 晝素列晝面。 圖框晝面之第一 根據本發明提出一種驅動 板，驅動方法包括下列之步驟。首先：驅動液晶顯示面 其具有多個畫素列。接著在圖晶顯示面板， 掃描訊號致能多個畫相之—個^ 抑期間中產生 同電壓訊號，以在第一掃插d二提供交流共 τ田弟一位準切換至第二 201123155 , 1 位準，將第一掃描期間劃分為第一及第二子掃描期間。接 著在第一子掃描期間中提供多筆奇數序資料驅動晝素列 上之奇數序晝素，以顯示圖框畫面中晝素列影像之奇數序 畫素影像。然後在第二子掃描期間中經由多條偶數序資料 線分別提供多筆偶數序資料驅動晝素列上之偶數序晝 素，以顯示圖框晝面中畫素列影像之偶數序晝素影像。 為讓本發明之上述内容能更明顯易懂，下文特舉一較 佳實施例，並配合所附圖式，作詳細說明如下： φ 【實施方式】 本實施例之液晶顯示器使用之交流共同電壓（Common Voltage)將各個掃描期間劃分成第一子掃描期間及第二 子掃描期間，並分別在第一及第二子掃描期間中根據對應 至奇數行及偶數行之畫素資料驅動對應的奇數序晝素及 偶數序晝素。 請參照第1圖，其繪示依照本發明實施例之液晶顯示 • 器的方塊圖。液晶顯示器1包括共同電壓產生電路10、時 序控制器（Timing Control ler)20、資料驅動器（Data Driver)30、掃描驅動器（Scan Driver)40及液晶顯示面板 50。液晶顯示面板50具有MxN之晝素陣列，其中Μ與N 為大於1之自然數。在一個例子中，Μ與Ν均為偶數。 請參照第2圖，其繪示乃第1圖之液晶顯示器的相關 訊號波形圖。掃描驅動器40用以受控於時序控制器20來 產生掃描訊號Sc(l)-Sc(M)，並將其經由對應之掃描線 (Scan Line)提供至液晶顯示面板50中。掃描訊號 201123155 1 vy -τν/^οι r-w ( ^The driving method of (Inversion) has existed and has been widely used in liquid crystal displays. In an example of the column inversion (R〇w Inversi〇n) driving method, the common voltage (c〇mm〇nv〇ltage) is a fixed reference power, and the level is the first pixel voltage of the common voltage. And the second pixel voltage lower than the common voltage drives the odd-numbered and even-numbered pixel columns in the liquid crystal display, respectively. The difference between the first pixel voltage and the common voltage is equal to the difference between the common voltage and the second pixel voltage, so as to display a uniform image surface, and in actual situations, the level of the common voltage should be A number of unreasonable causes of the offset, such that the first pixel voltage and the common voltage = difference is not equal to the difference between the common voltage and the second pixel voltage. In this way, the brightness of each element column in the same frame is uneven, which causes the display surface to produce bright and dark stripes. In addition, the display brightness of the adjacent frame is also uneven, causing flickering on the display screen (Flicker). In the first pass, the screen display problem is displayed by the dot inversion (Dot Inversi〇n) drive = column inversion driving method. However, the conventional infra-red f driving method has the disadvantages of high scanning voltage and data voltage level, and high design complexity of the power consumption circuit and the _ circuit. 201123155 [Description of the Invention] The present invention relates to a liquid crystal display and a driving method thereof, and the liquid crystal display and the driving method thereof according to the present invention can provide a comparison with the conventional column inversion driving method. Good picture display effect. Compared with the conventional dot inversion (Dot lnversi0n) driving method, the liquid crystal m and its axis method of the present invention have the advantages of low f consumption and low design complexity of the driving circuit. According to the invention, a liquid crystal display is provided for including a liquid crystal display panel, a scan driver (9), etc. during the first frame. The liquid crystal display panel has a plurality of pixel columns. Sweep: used to generate an alternating current during the first scan period of the first frame period; to generate a circuit with the first bit-cut period - and the second sub-scan The sequence data respectively drives multiple odds on the first pixel list. 2=Multiple === During the first-sub-scanning period, multiple even-ordered data are provided, respectively, and a plurality of even-numbered pixels on the spinel column are respectively, stomach, and motion. Dijon is listed behind. First of the drawing frame According to the present invention, a driving board is proposed, and the driving method includes the following steps. First, the liquid crystal display surface is driven to have a plurality of pixel columns. Then, in the picture display panel, the scanning signal enables the same voltage signal to be generated during the period of the plurality of pictures, so that the first scanning line d provides the communication total τ Tiandi one to switch to the second 201123155. The 1-bit period divides the first scanning period into the first and second sub-scanning periods. Then, in the first sub-scan period, a plurality of odd-numbered data are provided to drive the odd-order elements on the pixel list to display the odd-numbered pixel images of the pixel array image in the frame picture. Then, in the second sub-scanning period, a plurality of even-numbered data lines are respectively provided to drive the even-numbered elements on the pixel list to display the even-numbered pixel images of the pixels in the picture frame. . In order to make the above description of the present invention more comprehensible, a preferred embodiment will be described below in detail with reference to the accompanying drawings, as follows: φ [Embodiment] AC common voltage used in the liquid crystal display of this embodiment (Common Voltage) dividing each scanning period into a first sub-scan period and a second sub-scan period, and driving corresponding odd numbers according to pixel data corresponding to odd-numbered rows and even-numbered rows in the first and second sub-scanning periods, respectively Ordered halogen and even numbered halogen. Referring to Figure 1, a block diagram of a liquid crystal display device in accordance with an embodiment of the present invention is shown. The liquid crystal display 1 includes a common voltage generating circuit 10, a timing controller 20, a data driver 30, a scan driver 40, and a liquid crystal display panel 50. The liquid crystal display panel 50 has a matrix of MxN, where Μ and N are natural numbers greater than one. In one example, both Μ and Ν are even. Please refer to FIG. 2, which is a related signal waveform diagram of the liquid crystal display of FIG. 1. The scan driver 40 is configured to control the timing controller 20 to generate scan signals Sc(1)-Sc(M) and supply them to the liquid crystal display panel 50 via corresponding scan lines. Scanning signal 201123155 1 vy -τν/^οι r-w ( ^
Sc(l)-Sc(M)分別在掃描期間TSc(1)_TSc(M)中等於高位 準電壓VE ’以對應地致能液晶顯示面板50中之第1列到 第Μ列畫素。各掃描期間TSc(1)_TSc(m)2長度例如為相 等’且各掃描期間TSc(l)-TSc(M)彼此不相互重疊 (Overlap) 〇 共同電壓產生電路10用以產生交流之共同電壓Vcm， 共同電壓係週期性地切換於高位準電壓VH及低位準電壓 VL之間。在一個例子中，共同電壓Vcm經由時序控制器 20提供至資料驅動器3〇，共同電壓Vcm更經由資料驅動 器30與液晶顯示面板5〇間之資料通道提供到液晶顯示面 板50上。 掃描期間TSc(l)之時間長度至多等於共同電壓Vcm之 半週期（Half-cycie)時間長度，共同電壓Vcm更用以在各 個掃描期間TSc(l)-TSc(M)中觸發位準轉換之驅動緣 (Driving Edge) ’以將各個掃描期間TSc(l)-TSc(M)劃分 為兩個子掃描期間。 在一個例子中’共同電壓Vcm在奇數序掃描期間 TSc(l)、TSc(3)、TsC(5)、…、TSc(M-l)中觸發上升緣 (Rising Edge)，以將各奇數序掃描期間TSc(l)-TSc(M-l) 劃分為具有相同時間長度之子掃描期間TSl_i及TS2 i， 其中i為小於Μ之奇數。在子掃描期間TSl_i中，共同電 壓Vcm等於低位準電壓VL ;在子掃描期間TS2〜i中，共同 電壓Vcm等於高位準電壓VH。 ' 資料驅動器30用以在各個對應之奇數序掃描期間 TSc(l)-TSc(M_l)中經由對應之資料線（Data 14此）提3供對 201123155 , I WHooctrn 應之晝素電壓Sd(l)-Sd⑻至對應之晝素中。由於在 數序掃描期間TSc⑴-TSc(M—υ中之寫入操作為實質上: 同’接下來’僅以將資料寫入液晶顯示面板5〇之第 =畫面FOO中之第i畫素列之操作為例作說明，χ為自 在掃描期間TSc⑴中，第上畫素列中之所有晝素 應於掃描錢Se(i)為致能。在雜期間取⑴之子 期，tsi—i中，共同電壓Vcm等於低位準電壓几，資料= 動器30例如提供奇數序畫素電壓Sd(1)、Sd(3)、...、s 驅動第i晝素列中對應之奇數序晝素。其中奇 壓sd⑴-υ之位準大於或等於低位準電壓vl=電 此’使得第i晝素列中之奇數序畫素具有正極性晝素電壓。 在一，例子中，資料驅動器30更用以在掃描子期間 TSl_i中提供預充電（pre_charge)電壓對第丨畫素列中之 偶數序畫素進行預充電操作。Sc(l)-Sc(M) is equal to the high level voltage VE' in the scan period TSc(1)_TSc(M), respectively, to correspondingly enable the first column to the second array of pixels in the liquid crystal display panel 50. The lengths of the TSc(1)_TSc(m)2 are equal to each other during each scanning period, and the TSc(1)-TSc(M) are not overlapped with each other during each scanning period. The common voltage generating circuit 10 generates a common voltage of the alternating current. Vcm, the common voltage is periodically switched between the high level voltage VH and the low level voltage VL. In one example, the common voltage Vcm is supplied to the data driver 3 via the timing controller 20, and the common voltage Vcm is supplied to the liquid crystal display panel 50 via the data path between the data driver 30 and the liquid crystal display panel 5. The length of the TSc(l) during the scanning period is at most equal to the half-cycie length of the common voltage Vcm, and the common voltage Vcm is used to trigger the level conversion in the respective scanning periods TSc(l)-TSc(M). Driving Edge 'to divide each scanning period TSc(l)-TSc(M) into two sub-scanning periods. In one example, the common voltage Vcm triggers a rising edge (Rising Edge) in the odd-sequence scanning period TSc(1), TSc(3), TsC(5), ..., TSc(Ml) to scan each odd-sequence period TSc(l)-TSc(Ml) is divided into sub-scan periods TS1_i and TS2i having the same length of time, where i is an odd number smaller than Μ. In the sub-scanning period TS1_i, the common voltage Vcm is equal to the low level voltage VL; in the sub-scanning period TS2 to i, the common voltage Vcm is equal to the high level voltage VH. The data driver 30 is used to provide the data of the 201123155, I WHooctrn elemental voltage Sd(l) in the corresponding odd-sequence scanning period TSc(l)-TSc(M_l) via the corresponding data line (Data 14). )-Sd(8) to the corresponding element. Since the write operation in TSc(1)-TSc (M_υ during the digital sequence scan is substantially: the same as 'next' only writes the data to the i-th pixel column in the first picture FOO of the liquid crystal display panel 5? The operation is taken as an example. In the TSc(1) during the self-scanning period, all the elements in the upper pixel column should be enabled in the scanning money Se(i). In the period of the impurity period (1), tsi-i, The common voltage Vcm is equal to the low level voltage, and the data converter 30 supplies, for example, the odd-order pixel voltages Sd(1), Sd(3), ..., s to drive the corresponding odd-numbered elements in the i-th order. Wherein the odd voltage sd(1)-υ level is greater than or equal to the low level voltage vl=electrical such that the odd-order pixels in the first-order prime column have a positive-polarized pixel voltage. In one example, the data driver 30 is further used. The pre-charge operation is performed on the even-numbered pixels in the second pixel column by providing a pre-charge voltage in the scan sub-time period TS1_i.
在掃描期間TSc(i)之子掃描期間TS2(i)中，同電壓 Vein等於高位準電壓^ f料驅動器例如提供偶數序 電壓Sd(2)、Sd⑷.....Sd⑻驅動第i晝素列中對應之 偶數序晝素。其巾偶數序晝素電壓Sd⑵__)之位準小 於或等於高位準電壓VH’如此，使得第i畫素列中之偶數 序畫素具有負極性畫素電壓。 在一個例子中’資料驅動器3〇更用已在掃描子期間 TS2一i中提供預充電電壓對第i畫素列中之奇數序晝素^ 行預充電操作。 且μ 共同電壓Vcm在偶數序掃描期間TSc(2)、TSc(4)、.. 201123155In the sub-scanning period TS2(i) of the TSc(i) during the scanning period, the same voltage Vein is equal to the high-level voltage driver, for example, providing the even-numbered voltages Sd(2), Sd(4), ..., Sd(8) to drive the i-th column The corresponding even number of elements in the middle. The even-ordered pixel voltage Sd(2)__) of the towel has a level smaller than or equal to the high level voltage VH' such that the even-order pixels in the i-th pixel column have a negative polarity pixel voltage. In one example, the data driver 3 pre-charges the pre-charged voltage in the i-th pixel column with the pre-charge voltage provided in the scan sub-period TS2-i. And the μ common voltage Vcm is in the even-sequence scanning period TSc(2), TSc(4), .. 201123155
I W40^«^AI W40^«^A
Tsc(M)中觸發下降緣（FalUng Edge)，以將偶數序 間TSc⑵-TSc(M)劃分為具有相同時間長度之子掃描期間月 TS1」及TS2J，其中j為小於或等於M之偶數。在子 描期間TS1」中，共同電愿Vcm等於高位準電壓VH 掃描MTS2」中，共同電塵Vcm等於低位準電壓几。 與在積分期間TSc⑴中相似地，在掃描期間τ 中，第X個圖框畫面F(x)中第J·畫素列之所有晝素係回庫 =掃描訊號糾）為致能。在掃描㈣制此子掃描 二ts〇中’共同電壓Vcm等於高位準電㈣’資料驅動 f 30例如提供奇數序畫素電壓⑺⑴哉 素列中對應之奇數序晝素。其令奇數序畫素電壓“ =SdiN-1)之位準小於或等於高位準電㈣，如此， 传J旦素列中之奇數序畫素具有負極性畫素電壓。 ，知描期間TSc(j)之子掃描期間Τ%⑴中，同電壓 vcm專於低位準電壓几，資料驅動器例如提 I=d4(2)—S❹）驅動第j畫素列中對應之偶數序畫素 數序晝素電壓Sd(2)_Sd(N)之位準大於或等於低位 極性晝素電壓。素列中之偶數序畫素具有正 查根據以上敘述可知，在第χ個圖柜畫面f⑴中，第士 是所有奇數序畫素列）中之奇數序與偶數序畫 有正極性及負極性畫素電壓， 數序畫素列)中之奇數序與偶數序畫素；別具有 負極性及正極性化物電壓，如第3圖所示。 在本實施例中’雖僅以液晶顯示器（顯示第X個圖框 201123155 1 w«+〇j〇r/\ 晝面F(x)之操作為例作說明，然，液晶顯示器1顯示其他 圖框畫面之操作可根據液晶顯示器1顯示第X個圖框畫面 F(x)之操作類推得到。舉例來說，在第x+1個圖框晝面 F(x+1)中，液晶顯示器1中各晝素的畫素電壓極性如第4 圖所示。 請參照第5圖，其繪示依照本發明實施例之驅動方法 的流程圖。本實施例之驅動方法的各個流程步驟係已敘明 於前述說明書段落，於此，並不再進行贅述。 φ 在本實施例中，雖僅以共同電壓產生電路10經由時 序控制器20提供共同電壓Vcm至資料驅動器30，且共同 電壓Vcm更經由貧料驅動裔3 0與液晶顯不面板5 0間之通 訊連接提供至液晶顯示面板50的情形為例作說明，然， 共同電壓Vcm並不侷限於經由前述路徑來提供至液晶顯示 面板50。在其他例子中，共同電壓Vcm可不經由時脈控制 器20直接透過資料驅動器30提供至液晶顯示面板50,或 經由掃描驅動器40提供至液晶顯示面板50。在其他例子 • 中，共同電壓產生電路10亦可整合在時序控制器20中。 本實施例之液晶顯不益係透過父流之共同電歷將各 個掃描期間劃分為兩個子掃描期間，並分別在此兩個掃描 期間中根據對應至奇數行及偶數行之晝素資料驅動對應 的奇數序及偶數序晝素。其中在此兩個子掃描期間中，共 同電壓係具有相反之極性。如此，本實施例之液晶顯示器 可使用列反轉（Row Inversion)之驅動電路達到實質上相 似於點反轉（Dot Inversion)之驅動效果。 這樣一來，相較於傳統列反轉驅動方法，本實施例之 201123155 ’U 4及其驅動方法可提供較佳之晝面顯示效果。 示 W，於傳統點反轉驅動方法，本發明相關之液晶顯 °σ及/、驅動方法具有耗電量較低及驅動電路之設計複雜 度較低之優點。 综上所述’雖然本發明已以—較佳實施例揭露如上， 二八並非用以限定本發明。本發明所屬技術領域中具有通 吊知識者’在不脫離本發明之精神和範圍内，當可作各種 之更動與潤飾。因此’本發明 月之保濩範圍當視後附之申請 專利乾圍所界定者為準。 【圖式簡單說明】 第1圖㈣依照本發明實_之液晶顯示㈣方塊 第2圖緣示乃第1圖之液晶迤 圖 圖 s日顯不益的相關訊號波形 第3圖繪示液晶顯示器1顯示 .貝不之圖框晝面F(x)的示意 意圖 第4圖繪示液晶顯示器1顯 不之圖框晝面F(x+1)的示 第5圖繪示依照本發明實施例之驅動方法的流_ 【主要元件符號說明】 1 :液晶顯示器 10 ·共同電壓產生電路 201123155 I WHOJOr/Λ 20 :時序控制器 3 0 .貧料驅動裔 40 :掃描驅動器 5 0 ·液晶顯不面板 F(x)、F(x+l):第X個、第x+1個圖框晝面A falling edge (FalUng Edge) is triggered in Tsc(M) to divide the even-numbered sequence TSc(2)-TSc(M) into sub-scan periods TS1" and TS2J having the same length of time, where j is an even number less than or equal to M. In the sub-drawing period TS1", the common electric power Vcm is equal to the high level voltage VH scanning MTS2", and the common electric dust Vcm is equal to the low level voltage. Similarly to the integration period TSc(1), in the scanning period τ, all of the elements of the J-th pixel column in the X-th frame picture F(x) are converted to scan signal correction. In scanning (4), this sub-scan is performed. The common voltage Vcm is equal to the high-level quasi-electricity (four)' data drive f 30, for example, to provide an odd-order pixel voltage (7) (1) corresponding to the odd-numbered elements in the prime column. The order of the odd-numbered pixel voltage "=SdiN-1" is less than or equal to the high-level quasi-electricity (4), so that the odd-order pixels in the J-denier column have a negative-polarity pixel voltage. j) During the sub-scan period Τ%(1), the same voltage vcm is dedicated to the low level voltage, and the data driver, for example, I=d4(2)-S❹) drives the corresponding even-numbered prime order prime in the j-th pixel column. The level of the voltage Sd(2)_Sd(N) is greater than or equal to the low polarity polar element voltage. The even order pixel in the prime column has a positive check. According to the above description, in the second picture frame f(1), the taxi is The odd-numbered and even-ordered pictures in all odd-numbered ordering columns have odd-numbered and negative-polarized pixel voltages, and the odd-numbered and even-ordered pixels in the sequence of pixels are included; they have negative polarity and positive polarity voltage. As shown in Fig. 3. In the present embodiment, the operation of the liquid crystal display (displaying the Xth frame 201123155 1 w«+〇j〇r/\昼F(x) is taken as an example, However, the operation of displaying the other frame screen by the liquid crystal display 1 can display the operation of the Xth frame picture F(x) according to the liquid crystal display 1. For example, in the x+1th frame F(x+1), the pixel voltage polarity of each pixel in the liquid crystal display 1 is as shown in Fig. 4. Referring to Fig. 5, A flow chart of a driving method according to an embodiment of the present invention is shown. The various flow steps of the driving method of the present embodiment have been described in the foregoing specification, and will not be described again. φ In this embodiment, Only the common voltage generating circuit 10 supplies the common voltage Vcm to the data driver 30 via the timing controller 20, and the common voltage Vcm is further supplied to the liquid crystal display panel 50 via the communication connection between the poor driving driver 3 and the liquid crystal display panel 50. The case is exemplified. However, the common voltage Vcm is not limited to being supplied to the liquid crystal display panel 50 via the aforementioned path. In other examples, the common voltage Vcm may be directly supplied to the liquid crystal through the data driver 30 via the clock controller 20. The display panel 50 is provided to the liquid crystal display panel 50 via the scan driver 40. In other examples, the common voltage generating circuit 10 can also be integrated in the timing controller 20. The liquid crystal display of this embodiment The benefit period divides each scanning period into two sub-scanning periods through the common electrical calendar of the parent stream, and drives the corresponding odd-numbered order and even-numbered order according to the pixel data corresponding to the odd-numbered rows and the even-numbered rows in the two scanning periods respectively. In the two sub-scanning periods, the common voltage has opposite polarities. Thus, the liquid crystal display of the embodiment can use a column inversion driving circuit to achieve substantially similar to dot inversion ( The driving effect of Dot Inversion). In this way, the 201123155 'U 4 and its driving method of the present embodiment can provide a better side display effect than the conventional column inversion driving method. In the conventional dot inversion driving method, the liquid crystal display and the driving method of the present invention have the advantages of low power consumption and low design complexity of the driving circuit. In view of the above, the present invention has been disclosed in the above preferred embodiments, and the present invention is not intended to limit the invention. Those skilled in the art having the knowledge of the present invention can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention shall be subject to the definition of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1(d) is a liquid crystal display according to the present invention. FIG. 2 is a liquid crystal display diagram of FIG. 1 and a related signal waveform of the first embodiment. 1 shows the schematic intention of the frame F(x) of the frame. FIG. 4 shows the display of the frame F(x+1) of the liquid crystal display 1. FIG. 5 shows an embodiment according to the present invention. Flow of driving method _ [Description of main component symbols] 1 : Liquid crystal display 10 · Common voltage generating circuit 201123155 I WHOJOr / Λ 20 : Timing controller 3 0. Poor driver 40 : Scan driver 5 0 · LCD panel F(x), F(x+l): the Xth, x+1th frame