201205545 x vowo^JXXZlTW 34508twf.doc/n 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面板的驅動方法，且特 別是有關於一種預先充電的液晶顯示面板的驅動方法。同 時，也有關一種立體顯示裝置的驅動方法。 【先前技術】 隨著科技的日益進步，在顯示技術的發展方面，除了 追求顯示裝置的輕薄短小之外，更希望能達成顯示立體晝 面的目標。一般來說，顯示立體晝面的原理為將可形成立 體晝面之左眼畫面與右眼晝面分別送入使用者之左、右 眼，進而使大腦建構出一幅三度空間的立體晝面。因此， 如何使顯示裝置呈現立體的圖像或影像，便成為現今顯示 裝置技術極欲達到的目標。 就使用外觀而言，立體顯示技術可大致分成戴眼鏡式 (stereoscopic)及裸眼式(auto-stereoscopic)。其中，戴眼鏡式 立體顯示共可分為渡光眼鏡(color filter glasses)、偏光眼鏡 (polarizing glasses)、快門眼鏡(shutter glasses)等方式。戴 眼鏡式立體顯示的工作原理主要是利用顯示裝置送出具有 特殊訊息的左右眼影像，經由與之搭配之眼鏡的選擇，讓 左右眼分別看到左右眼影像，以形成立體視覺。現在戴眼 鏡式立體顯示已經發展成熟，並廣泛用到某些特殊用途 上，如軍事模擬或大型娛樂等。圖i是一種習知立體顯示 設備1的示意圖’包括顯示裝置20與眼鏡30，藉由有線 201205545 ---------^,1TW 34508twf.doc/n 或無線方式來控制開啟眼鏡3〇之右鏡片32(左鏡片34)並 關閉左鏡片34(右鏡片32)，使得僅右眼(左眼)能接收到晝 面，而圖2為圖1之立體顯示設備i在顯示立體畫面時的 時序圖，其中虛線代表低準位而為關閉狀態，實線代表各 疋件之操作情形，於高於虛線者表示高準位而為開啟狀 態。請參照圖1與圖2 ’該顯示裝置2〇可為一液晶顯示裝 置’包括液晶顯示面板22及背光模組24,該液晶顯示面 板22是藉由輸入電壓而改變液蟲的排列，當液晶轉到定位 時，即可顯示正確之光穿透率而呈現正確影像。 假設一訊號源所傳送的晝面資料驅動顯示裝置2〇在 每個圖框率(Framerate)T内更新並顯示一個單眼晝面，而 液晶顯示面板22只在更新時間TA内完成單眼晝面的更 新。如圖2中顯示面板的時序線所示，先予更新左眼晝面， 並在接續該更新時間TA之空白時間(blanking time)TB内 開啟眼鏡30之左鏡片34。此時，顯示裝置20的背光模組 24保持全時開啟，如圖2中背光模組的時序線所示，其中 時序線位於高準位(實線)代表背光模組為開啟的狀態，而 低準位(虛線)代表背光模組為關閉的狀態。以單眼晝面掃 描頻率為120赫兹為例’ T為1/120=8.33毫秒，而更新時 間TA佔5.64毫秒。由於液晶顯示面板22在畫面更新過 程中所顯示的晝面並非完全正確，故並不希望被使用者看 到’因此眼鏡30的右鏡片32與左鏡片34在這5.64毫秒 内都為不透光狀態，以避免配戴眼鏡30的使用者看到更新 中的液晶顯示面板22的晝面’如圖2中右鏡片與左鏡片的 34508twf.doc/n 201205545. 時序線皆位於低準位而為關閉狀態。 在液晶顯示面板22完成左眼晝面的更新後’液晶顯 示面板22會在空白時間TBr持續顯示已更新完成的左眼 畫面，而背光模組24依然保持全時開啟以提供背光源。此 外，眼鏡30的左鏡片34在空白時間TB内切換為透光狀 態’以使顯示裝置20所顯示的左眼晝面可到達使用者的左 眼。眼鏡30的右鏡片32在此空白時間TB内仍保持不透 光狀態’以避免顯示裝置2 〇所顯示的左眼畫面到達使用者 的右眼。 依循相似的程序，液晶顯示面板22會在接續左眼晝 面之下一圖框率T内更新並顯示右眼晝面。其中，更新時 間TA内完成右眼晝面更新，並於接續的空白時間tb顯 示已更新完成的右眼晝面，而背光模組24依然保持全時開 啟以提供背光源。眼鏡30的右鏡片32在更新時間丁八保 持不透光狀態，並在後續的空白時間TB内切換為透光狀 態’以使顯示裝茸20所顯示的更新完成的右眼晝面可到達 使用者的右眼。在右眼晝面更新及顯示時間内，眼鏡30 的左鏡片34都保持不透光狀態，以避免顯示裝置20所顯 示的右眼畫面到達使用者的左眼。 依上述方式’利用視覺暫留的現象，配戴眼鏡3〇的 使用者即可觀賞到立體畫面。 然而’由於液晶受電壓驅動而反應到位需一定時間， 且液晶顯示面板22通常是由該液晶顯示面板22之上方由 上往下依序掃描’故液晶顯示面板22下方的液晶會較晚被 201205545 r v〇v〇 7·?αλΖ 1TW 34508twf.doc/n 驅動，故會發生已經開啟眼鏡3〇但液晶顯示面板22下方 的液晶尚未反應到位的情形，如此將可能讓使用者於空白 時間ΤΒ β看到錯誤的影像，亦即殘影現象(c麵·_。 如圖3所不之掃描線驅動時間與液晶反應時間的關係圖， 第-條、第N/2條以及第n條掃描線等待被掃描脈衝信號 P1驅動的時間分別為tG、tl以及t2(t2>u >⑼，而於掃描 脈衝信號P1輸人後且於空白時間TB前，各該掃描線受電 壓驅動且液晶可反應的時間長度分別依序為 TR0、TR1 以 及TR2。由圖3可看出越晚被驅動的掃描線由於可反應的 時間較短’液晶無法在進入空白時間TB轉到定位，因此 所表現絲的穿透率並不正確，使紐晶顯示面板22出現 【發明内容】 本發明提供一種液晶顯示面板的驅動方法，可改善液 晶顯示面板的殘影現象。 本發明提供-種液晶顯示面板的驅動方法，包括下列 ^驟。其中’液晶顯示面板包括Μ條掃描線以及多個書 素，Μ為正整數，各掃描線至少連接—個畫素。於： 目標灰階值以第—目標電壓值驅動上述 晝素。於接續第-朗之第二期間的部分區間内，驅 晶顯示面板的第N條掃描線至第μ條掃描線上的佥二 -預設灰階值，其中Ν為正整數，且UN腹。 第-期間之第三期間内，依據第二目標灰階值以第二目標 34508tw£d〇c/n 201205545 電壓值驅動上述晝素。 本發明亦提供-種立體顯示裝置的 之觀視裝置以及-液晶二3 條掃描線以及多個晝素，其中Μ 二整^且冬掃描線至少連接一個畫素。於一第一 内’依據第一目標灰階值以笛曰’ 素。於接續第值驅動上述晝 顯干面μ期間的部分區間内，驅動液晶 預設灰==条掃描線至第㈣掃推線上的畫素至- ==期畫=制―-期二 壓值實關巾’其找畫綠據第—目標電 面。…、畫面，依據第二目標電壓值可顯示第二書 在本發明之一實施例中，其中於該第二期間之 間内係同時驅動第Ν條至第Μ條掃描線。 在本發明之—實施例中，其中於該第二_之部分區 3内係循序驅動第Ν條至第Μ條掃描線。 μ條ίίΓΓ之—實施例中，其中驅動第Ν條掃描線至第 〜条知描線上的晝素至預設灰階值的步驟更包括依據一第 =驅動查找表決定第Ν條掃描線至第Μ條掃描線 &素所需要的預設灰階值。 在本發明之一實施例中，其中預設灰階值是參考晝素 34508twf.doc/n 所連接的掃描線的位置及該晝素之第一目標灰階值而定。 在本發明之:實施例中，其中更依據-第二過驅動查 找表決疋液晶顯示面板之第二畫面的第二目標電堡值。 在本發明之一實施例中，其中第二晝面的第二目標 壓值是參考各畫素的預設灰階值及第二晝面的第二^ 階值而定。 錢 在本發明之-實施例中，液晶顯示面板的驅動方 包括除部分區間之第二期㈣，提供液晶顯示面板_光源。 ★在本發明之一實施例中，其中觀視裝置包括兩個觀視 窗，液晶顯示面板的驅動方法更包括於除部分區間之第二 期間内控制觀視裝置之其中之一觀視窗為可透光。一 在本發明之一實施例中，該第一晝面與第二畫面可 構一立體晝面。 基於上述，本發明利用在顯示第一畫面之後，預充電 晝面期間預先將液晶顯示面板的晝素充電至預設灰階值， 以減少顯示第二晝面時液晶轉到定位所需的時間，改善液 晶顯示面板的殘影現象。 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉實施例，並配合所附圖式作詳細說明如下。 【實施方式】 請參照圖4 ’係繪示本發明一實施例之立體顯示敦置 的示意圖。立體顯示裝置40〇包括一液晶顯示裝置4〇2以 及一可控制之觀視裝置4〇4(例如快門眼鏡），其中液晶顯示 201205545 * vwu^vXXZlTW 34508twf.doc/n 裝置402更包括一液晶顯示面板4〇3及一背光源（圖未 視）’其中觀視裝置404包括兩個觀視窗wi、W2，而液晶 顯示面板403之架構與先前技術相同，在此不再重複贅 述。圖5緣示為本發明一實施例之立體顯示裝置及其 液晶顯示面板403的驅動方法的流程圖。圖6繪示為利用 圖5之驅動方法顯示立體晝面時的時序圖，其中圖6之時 序圖的準位高低代表晝素資料是否被送入晝素中。此驅動 方法驅動的液晶顯示面板403包括多條掃描線以及多個晝 • 素，各掃描線至少連接一個晝素，藉由依序顯示代表左眼 晝面之第一晝面與代表右眼晝面之第二晝面，同時搭配觀 視裝置404，而可將左、右眼晝面依序傳送到使用者相應 之眼中，從而讓使用者建構立體影像。請同時參照圖4〜 圖6，液晶顯示面板403的驅動方法包括下列步驟。首先， 步驟S502,在第一期間TRE1内，液晶顯示面板403上的 多條掃描線依序地被驅動並輸入代表不同灰階值之第一目 標電壓值，以驅動各條掃描線上的晝素至所欲顯示的第一 φ 目標灰階值，進而於液晶顯示面板403上顯示一第一畫 面。然由於該第一晝面轉換的過程並不希望被使用者看 到’因此在第一期間TRE1内液晶顯示面板403的背光源 為關閉的狀態，且觀視裝置404的兩個觀視窗W卜W2被 控制在不透光的狀態。 接著，步驟S504，進入接續第一期間TRE1之第二期 間THP，包括一保持畫面期間τη與一預充電晝面期間 TP。在該第二期間THP的保持晝面期間TH中，液晶顯示 9 34508twf.doc/n 201205545 面板403上各個畫素的畫素電壓將被維持在第一期間 TRE1第一目標灰階值的第一目標電壓值，以使液晶顯示 面板403持續顯示該第一晝面。而在保持晝面期間τη， 液晶顯示面板403的背光源將轉為開啟的狀態，並透過觀 視裝置404之觀視窗W卜W2配合開啟，以使使用者可看 到液晶顯示面板403上各個具有不同灰階值的晝素所構成 的顯示晝面。例如在液晶顯示面板403顯示第一畫面而該 第一畫面為左眼晝面時’控制觀視裝置404中對應左眼的 觀視窗W1處於可透光的狀態’以使使用者的左眼可接收 左眼晝面，並控制觀視裝置404中對應右眼的觀視窗W2 處於不透光的狀態’以阻擋使用者的右眼接收到左眼畫面。 接著，步驟S506，在第二期間THP中的部份區間， 亦即預充電晝面期間TP’將液晶顯示面板403上的畫素驅 動至一預設灰階值。之後，步驟S508，再進入接續第二期 間THP之第三期間TRE3，並在第三期間TRE3内，液晶 顯示面板403上的多條掃描線依序地被驅動並輸入代表不 同灰階值之第二目標電壓值，以驅動各條掃描線上的晝素 至所欲顯示的第二目標灰階值，進而於液晶顯示面板403 上顯示一第二晝面，其中在第三期間TRE3内觀視裝置404 的兩個觀視窗W卜W2被控制在不透光的狀態，以避免轉 換的過程被使用者看到。如此，可在接續第二期間THP之 第三期間TRE3到來時，節省晝素被充電到第二目標灰階 值所需的時間。其中在預充電晝面期間TP，液晶顯示面板 403的背光源轉為關閉的狀態，且觀視裝置404的兩個觀 201205545. * v«w^JXXZlTW 34508twf.doc/n 視窗W卜W2亦被控制在不透光的狀態，以避免轉換的過 程被使用者看到。故在液晶顯示面板403應用於顯示立體 影像時’第一晝面以及第二晝面可分別為左眼晝面與右眼 晝面，而觀視裝置404之觀視窗W卜W2也分別開啟，而 讓使用者可依序看到左眼晝面與右眼畫面而建構立體影 像。而且，預免電畫面期間TP以緊臨第三期間TRE3為 佳’並與第一期間TRE1相距保持畫面期間TH。 舉例來說，假設液晶顯示面板403上晝素的灰階值可 為0〜255,在預充電晝面期間τρ可將晝素的灰階值驅動至 128。如此一來便可避免當畫素的灰階值有太大幅度的轉變 (例如0—255或255—0)時，因晝素來不及顯示目標灰階 值’而使液晶顯示面板403出現殘影的現象。本實施例雖 設定晝素的預設灰階值為128,然不以此為限，使用者可 依實際情形調整此預設灰階值，例如依據灰階值的範圍大 小或顯示畫面的整體亮度來調整預設灰階值的大小，只要 不為0即可。 值得注意的是，本實施例在第一期間TRE1、預充電 晝面期間TP以及第三期間TRE3將液晶顯示面板403的 背光源關閉，以防使用者看到在此兩期間液晶的灰階值轉 換的過程。當然，亦可同時關閉觀視裝置404之兩個觀視 窗W1、W2而達到相同效果。例如應用於立體顯示技術 中’使用快門眼鏡的液晶顯示面板403時，亦可使液晶顯 示面板403的背光源於該第一期間TRE1、該第二期間THP 及該第三期間TRE3 —直開啟，同時控制快門眼鏡的開啟 iZITW 34508twf.d〇c/n 201205545 與關閉，以將左右兩眼的畫面同時遮蔽，使使用者無法看 到液晶的灰階值轉換的過程，並藉由控制兩眼鏡片的開 啟、關閉次序來讓使用者之雙眼分別接收到相應之畫面而 可建構立體畫面。 詳細來說’上述步驟S506中將液晶顯示面板403上 的晝素被預充電至預設灰階值的方式例如是，同時驅動液 晶顯示面板403上所有的掃描線，以同時驅動各掃描線對 應的晝素，而將所有晝素調整至預設灰階值。在其他實施 例中，也可以逐條驅動各掃描線的方式來依序將各條掃描 線上對應的晝素預充電至預設灰階值。為避免此種調整方 式，因部分的掃描線較晚_動，進而使得其對應的晝素 可月t*無法於預充電晝面朗τρ被充電至預設灰階值，在 不同時間點被驅動的掃描線上的畫素依據其在第一晝面 (亦即保持期間ΤΗ的顯示畫面)所具有的第一目標灰階值 =同，搭配不同的過驅動電壓(〇ver Driving键㈣，藉 較向的驅動電壓使液晶顯示面板上的畫素在預充電 ，期間TP皆能確實被預充電至預設灰階值。除了可依 亦第一晝面的第—目標灰階值來進行晝素的預充電外， 驅二同時依據第三期間TRE3所顯示的第二畫面來調整過 t電壓。例如當第二晝面為較亮的畫面時，便把在預充 面期間TP所欲達到的預設灰階值提高，相對地，若 ς晝面為較暗的晝面時，便把在預充電晝面期間T &建到的預設灰階值降低。 其中，驅動時間點不同的掃描線上的畫素預充電至預 12 201205545 tvov/o^jXXZITW 34508twf.doc/n 設灰階值所㈣過_電壓值可以依據—過驅動查找表 (Over Driving Look Up Table)來決定。如圖7A所示之過驅 動查找表，其左邊的攔位表示第一畫面中晝素之第一目標 灰階值，上面的攔位表示各該掃描線的位置，其中M為正 整數，且隨著液晶顯示面板403之解析度不同而異。以 Full-HD為例，Μ為108(^根據第一畫面中各畫素的第一 目標灰階值及其對應的掃描線的位置，就可決定各畫素在 預充電畫面期間TP内所被充電之預設灰階值。. § 在第三期間TRE3亦可以利用另一過驅動查找表來決 定將晝素充電至第二晝面所需要的過驅動電壓。如圖 所示之過驅動查找表，其左邊的攔位表示在各畫素在預充 電畫面期間TP所驅動之預設灰階值’而上邊的欄位則表 示晝素的第二目標灰階值，依據此過驅動查找表便可決定 出液晶顯示面板403上各個晝素在第三期間TRE3被充電 至第二目標灰階值所需的第二目標電壓值。由上可知，透 過配合圖7A以及圖7B的過驅動查找表來決定在預充電畫 鲁 面期間TP以及第三期間TRE3施加於晝素上的過驅動電. 壓值’即可精早地將液晶顯示面板403上的各個畫素分別 於預充電畫面期間TP以及第三期間TRE3進行充電及顯 示畫面’避免液晶顯示面板403的顯示晝面出現殘影的現 象，而降低液晶顯示面板403的顯示品質。 上述實施例為對液晶顯示面板403上所有掃描線上的 晝素進行預充電的方式來避免顯示晝面出現殘影，然實際 上旅不以此為限。在部分實施例中，先被驅動的掃描線上 13 201205545 rvowo^^^ZlTW 34508twf.doc/n 所對應的畫素可具有足夠的反應時間，使液晶轉到預設灰 階值的狀態，因此不需在預充電畫面期間τρ被預先充電， 僅需針對反應時間不足的掃描線(亦即在第一期間TRE1較 晚被驅動的掃描線)進行預充電的步驟。舉例來說，圖8繪 示為利用本發明另一實施例之驅動方法顯示立體晝面時的 時序圖。假設液晶顯示面板403具有Μ為1024條之掃描 線，其中在更新顯示畫面時前250條掃描線具有足夠的反 應時間，可使液晶轉到目標灰階榼的狀態，而較晚被驅動 的774條掃描線則欠缺足夠的反應時間。因此在預充電晝 面期間ΤΡ僅需對較晚被驅動的774條掃描線進行上述預 充電的步驟，其中詳細的預充電方法已於上述實施例中教 示，因此不再贅述。 综上所述，本發明在第二期間的部分區間内預先將液 晶顯示面板的畫素充電至預設灰階值，以減少液晶轉到定 位所需的時間，改善液晶顯示面板的殘影現象。被預充電 的畫素可選擇性地限定為液晶顯示面板上較晚被驅動的掃 描線所對應的晝素，以提高液晶顯示面板的省電效率。 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明，任何所屬技術領域中具有通常知識者，在不^離 本發明之精神和範圍内，當可作些許之更動與潤飾， 發明之保護範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1繪示為習知立體顯示設備的示意圖。 14 201205545 ▲ www^wXXZlTW 34508twf.doc/n 圖2繪示為圖i之立體顯示設備在顯示立體畫面時的 時序圖。 圖3繪示為掃描線驅動時間與液晶反應時間的關係 圖。 圖4繪示為本發明一實施例之立體顯示裝置的示意 圖。 圖5綠示為本發明一實施例之立體顯示裝置及其液晶 顯示面板的驅動方法的流程圖。 鲁 冑6緣不為利用圖5之驅動方法顯示立體晝面時的時 序圖。 圖7A ^ 7B繪不為本發明實施例之過驅動查找表。 序圖圖8繪示為本發明另一實施例之顯示立體晝面時的時 【主要元件符號說明】 20 顯示裝置 22 液晶蹿示面板 24 背光模組 30 眼鏡 32 右鏡片 34 左鏡片 400 .立體顯示裳置 402 ·液晶顯示裝置 403 :液晶顯示面板 15 34508twf.doc/n 201205545 404 :觀視裝置 W卜W2 :觀視窗 TRE1 :第一期間 THP :第二期間 TRE3 :第三期間 TH :保持晝面期間 TP :預充電晝面期間 T :圖框率 TA:更新時間 ® TB:空白時間 t0、tl、t2 :等待被掃描脈衝信號驅動的時間 P1 :掃描脈衝信號 TR0、TR1、TR2 :反應時間201205545 x vowo^JXXZlTW 34508twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a driving method of a liquid crystal display panel, and more particularly to a method for driving a precharged liquid crystal display panel . At the same time, it relates to a driving method of a stereoscopic display device. [Prior Art] With the advancement of technology, in the development of display technology, in addition to pursuing the slimness and shortness of display devices, it is more desirable to achieve the goal of displaying stereoscopic aspects. In general, the principle of displaying a stereoscopic face is to send a left-eye image and a right-eye face that can form a stereoscopic face into the left and right eyes of the user, respectively, thereby causing the brain to construct a three-dimensional space. surface. Therefore, how to make a display device to present a stereoscopic image or image has become an extremely desirable target of today's display device technology. As far as the appearance is concerned, stereoscopic display technology can be roughly classified into stereoscopic and auto-stereoscopic. Among them, the glasses-type stereo display can be divided into color filter glasses, polarizing glasses, and shutter glasses. The working principle of the glasses-type stereo display is mainly to use the display device to send the left and right eye images with special information, and the left and right eyes respectively see the left and right eye images through the selection of the glasses matched with them to form stereoscopic vision. Nowadays, stereoscopic display with stereoscopic glasses has matured and is widely used in certain special applications, such as military simulation or large-scale entertainment. FIG. 1 is a schematic diagram of a conventional stereoscopic display device 1 including a display device 20 and glasses 30, and the open glasses 3 are controlled by wired 201205545 ---------^, 1TW 34508twf.doc/n or wirelessly. The right lens 32 (left lens 34) and the left lens 34 (right lens 32) are closed so that only the right eye (left eye) can receive the face, and FIG. 2 is the stereoscopic display device i of FIG. The timing chart of the time, in which the broken line represents the low level and is in the closed state, the solid line represents the operation of each component, and the higher than the dotted line indicates the high level and is in the open state. Referring to FIG. 1 and FIG. 2, the display device 2 can be a liquid crystal display device, including a liquid crystal display panel 22 and a backlight module 24, wherein the liquid crystal display panel 22 changes the arrangement of liquid insects by inputting a voltage. When you go to the position, you can display the correct light penetration and present the correct image. It is assumed that the face data transmitted by a signal source drives the display device 2 to update and display a single eye face in each frame rate T, and the liquid crystal display panel 22 only completes the single eye face in the update time TA. Update. As shown in the timing line of the display panel in Fig. 2, the left eye face is updated first, and the left lens 34 of the glasses 30 is opened in the blanking time TB following the update time TA. At this time, the backlight module 24 of the display device 20 is kept fully turned on, as shown in the timing line of the backlight module in FIG. 2, wherein the timing line is at a high level (solid line), and the backlight module is turned on. The low level (dashed line) represents the state in which the backlight module is off. Taking the single-eye scan frequency as 120 Hz as an example, 'T is 1/120 = 8.33 milliseconds, and the update time TA is 5.64 milliseconds. Since the facet displayed by the liquid crystal display panel 22 during the screen update process is not completely correct, it is not desirable to be seen by the user. Therefore, the right lens 32 and the left lens 34 of the glasses 30 are opaque within 5.64 milliseconds. The state is to prevent the user wearing the glasses 30 from seeing the face of the updated liquid crystal display panel 22 as shown in the right lens and the left lens of FIG. 2, 34508 twf.doc/n 201205545. The timing lines are all at a low level. Disabled. After the liquid crystal display panel 22 completes the updating of the left eyelid surface, the liquid crystal display panel 22 continues to display the updated left eye picture at the blank time TBr, while the backlight module 24 remains fully turned on to provide a backlight. In addition, the left lens 34 of the eyeglasses 30 is switched to the light transmitting state during the blanking time TB so that the left eye face displayed by the display device 20 can reach the left eye of the user. The right lens 32 of the eyeglasses 30 remains opaque during this blanking time TB' to prevent the left eye image displayed by the display device 2 from reaching the user's right eye. Following a similar procedure, the liquid crystal display panel 22 will update and display the right eye face within a frame rate T below the left eye face. The right eye face update is completed in the update time TA, and the updated right eye face is displayed at the subsequent blank time tb, and the backlight module 24 remains fully turned on to provide a backlight. The right lens 32 of the glasses 30 remains opaque during the update time, and is switched to the light transmitting state during the subsequent blanking time TB to enable the updated right eye face displayed by the display blasting 20 to reach the use. The right eye of the person. During the right eyelid update and display time, the left lens 34 of the glasses 30 remains opaque to prevent the right eye image displayed by the display device 20 from reaching the user's left eye. In the above manner, by using the phenomenon of persistence of vision, a user wearing glasses 3 can view a stereoscopic picture. However, since it takes a certain time for the liquid crystal to be reacted in place by the voltage, and the liquid crystal display panel 22 is normally scanned from the top to the bottom of the liquid crystal display panel 22, the liquid crystal under the liquid crystal display panel 22 will be later 201205545. Rv〇v〇7·?αλΖ 1TW 34508twf.doc/n drive, so it will happen that the glasses have been turned on 3 but the liquid crystal below the liquid crystal display panel 22 has not been reflected in place, so that the user may see the blank time ΤΒ β To the wrong image, that is, the residual image phenomenon (c-plane·_. Figure 3 shows the relationship between the scan line drive time and the liquid crystal reaction time, the first, the N/2th, and the nth scan line wait The time driven by the scan pulse signal P1 is tG, t1, and t2, respectively (t2 > u > (9), and after the scan pulse signal P1 is input and before the blank time TB, each of the scan lines is driven by the voltage and the liquid crystal is reactive. The lengths of time are in the order of TR0, TR1 and TR2. It can be seen from Fig. 3 that the later the scanned line is shorter due to the shorter response time, the liquid crystal cannot be transferred to the positioning time in the blanking time TB, so the silk is expressed. The present invention provides a method for driving a liquid crystal display panel, which can improve the image sticking phenomenon of the liquid crystal display panel. The present invention provides a driving method for a liquid crystal display panel. The liquid crystal display panel includes a scan line and a plurality of pixels, and Μ is a positive integer, and each scan line is connected to at least one pixel. The target gray scale value is driven by the first target voltage value. In the partial interval of the second period following the second period, the second-preset gray scale value of the Nth scanning line to the μth scanning line of the driving display panel, where Ν is a positive integer, And during the third period of the first period, the above-mentioned halogen is driven according to the second target gray scale value by the second target 34508 twd d c / n 201205545. The present invention also provides a stereoscopic display device. The viewing device and the liquid crystal two scanning lines and the plurality of pixels, wherein the second and the winter scanning lines are connected to at least one pixel. In the first one, the first target gray scale value is the flute. In the continuation Driving the liquid crystal preset ash == strip scan line to the (4) sweep line in the partial interval during the above-mentioned 干 干 dry surface μ to -==期画=制--期二压值实关巾' The second book is displayed according to the second target voltage value according to the second target voltage value. In the embodiment of the present invention, the second leg is driven simultaneously during the second period. In the embodiment of the present invention, the scan line to the scan line are sequentially driven in the partial region 3 of the second portion. In the embodiment, wherein The step of driving the 扫描 scan line to the 昼 条 知 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到 到The default grayscale value. In an embodiment of the invention, the preset grayscale value is determined by the position of the scan line to which the reference pixel 34508twf.doc/n is connected and the first target grayscale value of the pixel. In an embodiment of the invention, the second target electric bunker value of the second picture of the liquid crystal display panel is further searched according to the second overdrive. In an embodiment of the invention, the second target pressure value of the second pupil is determined by reference to a preset grayscale value of each pixel and a second threshold value of the second pupil plane. In the embodiment of the present invention, the driving side of the liquid crystal display panel includes a liquid crystal display panel_light source in addition to the second period (4) of the partial section. In an embodiment of the invention, wherein the viewing device comprises two viewing windows, the driving method of the liquid crystal display panel further comprises controlling one of the viewing windows of the viewing device to be transparent during the second period of the partial interval. Light. In an embodiment of the invention, the first side surface and the second screen form a stereoscopic surface. Based on the above, the present invention utilizes the charging of the pixels of the liquid crystal display panel to the preset grayscale value in advance during the precharging of the kneading surface after the first screen is displayed, so as to reduce the time required for the liquid crystal to go to the positioning when the second kneading surface is displayed. Improve the image sticking phenomenon of the liquid crystal display panel. The above described features and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Referring to Figure 4, there is shown a schematic view of a stereoscopic display of an embodiment of the present invention. The stereoscopic display device 40A includes a liquid crystal display device 4〇2 and a controllable viewing device 4〇4 (for example, shutter glasses), wherein the liquid crystal display 201205545 * vwu^vXXZlTW 34508twf.doc/n device 402 further includes a liquid crystal display The panel 4〇3 and a backlight (not shown), wherein the viewing device 404 includes two viewing windows wi, W2, and the architecture of the liquid crystal display panel 403 is the same as that of the prior art, and details are not repeated herein. Fig. 5 is a flow chart showing a method of driving a stereoscopic display device and a liquid crystal display panel 403 according to an embodiment of the present invention. Fig. 6 is a timing chart showing the use of the driving method of Fig. 5 to display a stereoscopic surface, wherein the level of the timing diagram of Fig. 6 indicates whether or not the pixel data is fed into the pixel. The liquid crystal display panel 403 driven by the driving method comprises a plurality of scanning lines and a plurality of pixels, wherein each scanning line is connected to at least one element, and the first side surface representing the left eye face and the right eye side face are sequentially displayed. The second side of the face is matched with the viewing device 404, and the left and right eyelid faces can be sequentially transmitted to the corresponding eyes of the user, thereby allowing the user to construct a stereoscopic image. Referring to FIG. 4 to FIG. 6, the driving method of the liquid crystal display panel 403 includes the following steps. First, in step S502, in the first period TRE1, a plurality of scan lines on the liquid crystal display panel 403 are sequentially driven and input first target voltage values representing different gray scale values to drive the pixels on the respective scan lines. To the first φ target gray scale value to be displayed, a first picture is displayed on the liquid crystal display panel 403. However, since the process of the first facet conversion does not want to be seen by the user, the backlight of the liquid crystal display panel 403 is in the closed state during the first period TRE1, and the two viewing windows of the viewing device 404 are W2 is controlled in an opaque state. Next, in step S504, the second period THP of the subsequent first period TRE1 is entered, including a hold picture period τη and a precharge buffer period TP. During the holding period TH of the second period THP, the pixel voltage of each pixel on the liquid crystal display 9 34508 twf.doc/n 201205545 panel 403 will be maintained at the first of the first target gray scale value in the first period TRE1 The target voltage value is such that the liquid crystal display panel 403 continuously displays the first pupil face. While maintaining the kneading period τη, the backlight of the liquid crystal display panel 403 will be turned into an open state, and is turned on through the viewing window W2 of the viewing device 404, so that the user can see each of the liquid crystal display panels 403. A display surface composed of halogens having different gray scale values. For example, when the first screen is displayed on the liquid crystal display panel 403 and the first screen is the left-eye plane, the viewing window W1 corresponding to the left eye in the viewing device 404 is controlled to be in a light-transmissive state so that the left eye of the user can be The left eyelid surface is received, and the viewing window W2 corresponding to the right eye in the viewing device 404 is controlled to be in an opaque state to block the user's right eye from receiving the left eye image. Next, in step S506, the pixels on the liquid crystal display panel 403 are driven to a preset gray scale value in a partial interval in the second period THP, that is, in the precharge buffer period TP'. Then, in step S508, the third period TRE3 of the second period THP is further entered, and in the third period TRE3, the plurality of scan lines on the liquid crystal display panel 403 are sequentially driven and input with the values representing different gray scale values. a second target voltage value for driving the pixels on each scan line to the second target gray scale value to be displayed, and then displaying a second surface on the liquid crystal display panel 403, wherein the viewing device is in the third period TRE3 The two viewing windows of the 404 are controlled to be in an opaque state to prevent the conversion process from being seen by the user. Thus, the time required for the pixel to be charged to the second target gray scale value can be saved when the third period TRE3 of the second period THP is continued. During the pre-charging period TP, the backlight of the liquid crystal display panel 403 is turned off, and the two views of the viewing device 404 201205545. * v«w^JXXZlTW 34508twf.doc/n Windows W Bu W2 is also Controlled in an opaque state to avoid the process of conversion being seen by the user. Therefore, when the liquid crystal display panel 403 is applied to display a stereoscopic image, the first pupil plane and the second pupil plane may be the left eye pupil plane and the right eye pupil plane, respectively, and the viewing window W2 of the viewing device 404 is also respectively turned on. The user can view the left eye and the right eye in sequence to construct a stereoscopic image. Moreover, the pre-power-free picture period TP is preferably close to the third period TRE3 and maintains the picture period TH from the first period TRE1. For example, assuming that the gray scale value of the pixel on the liquid crystal display panel 403 can be 0 to 255, τρ can drive the gray scale value of the pixel to 128 during the precharged plane. In this way, when the gray scale value of the pixel has too large a transition (for example, 0-255 or 255-0), the liquid crystal display panel 403 has a residual image because the pixel cannot display the target grayscale value. The phenomenon. In this embodiment, although the preset grayscale value of the pixel is set to 128, the user can adjust the preset grayscale value according to the actual situation, for example, according to the range of the grayscale value or the overall display screen. Brightness adjusts the size of the preset grayscale value as long as it is not 0. It should be noted that, in this embodiment, the backlight of the liquid crystal display panel 403 is turned off during the first period TRE1, the pre-charging buffer period TP, and the third period TRE3 to prevent the user from seeing the grayscale value of the liquid crystal during the two periods. The process of conversion. Of course, it is also possible to simultaneously close the two viewing windows W1, W2 of the viewing device 404 to achieve the same effect. For example, when the liquid crystal display panel 403 using shutter glasses is used in the stereoscopic display technology, the backlight of the liquid crystal display panel 403 may be turned on in the first period TRE1, the second period THP, and the third period TRE3. At the same time, the shutter glasses are opened iZITW 34508twf.d〇c/n 201205545 and closed, so that the left and right eyes are simultaneously shielded, so that the user cannot see the process of gray scale value conversion of the liquid crystal, and by controlling the two glasses The order of opening and closing allows the user's eyes to receive corresponding pictures and construct a stereoscopic picture. In detail, the manner in which the pixels on the liquid crystal display panel 403 are precharged to the preset gray scale value in the above step S506 is, for example, simultaneously driving all the scan lines on the liquid crystal display panel 403 to simultaneously drive the respective scan lines. The morpheme, and adjust all the morphemes to the preset grayscale value. In other embodiments, the scan lines may be driven one by one to pre-charge the corresponding pixels on each scan line to a preset gray scale value. In order to avoid this kind of adjustment, some of the scan lines are late, so that the corresponding pixels can be charged to the preset gray level value at the pre-charged surface, which is charged at different time points. The pixel on the driven scan line is based on the first target gray scale value of the first screen (that is, the display screen during the hold period) = the same as the different overdrive voltage (〇ver Driving button (4), borrowed The relatively driving voltage causes the pixels on the liquid crystal display panel to be pre-charged, and the TP can be pre-charged to the preset grayscale value. In addition to the first target grayscale value of the first surface. In addition to the pre-charging, the driver 2 adjusts the voltage of t according to the second picture displayed by the third period TRE3. For example, when the second side is a brighter picture, the TP is desired during the pre-filling period. The preset gray scale value is increased. In contrast, if the face is a darker face, the preset gray scale value established during the precharged face is lowered. Among them, the drive time is different. Pre-charging of pixels on the scan line to pre-2012 201205545 tvov/o^jXXZITW 34 508twf.doc/n Set the grayscale value (4) The overvoltage value can be determined according to the Over Driving Look Up Table. As shown in Figure 7A, the overdrive lookup table has the left stop position indicating The first target gray scale value of the pixel in the picture, the upper block indicates the position of each scan line, where M is a positive integer, and varies with the resolution of the liquid crystal display panel 403. The Full-HD is For example, Μ is 108 (^ according to the first target grayscale value of each pixel in the first picture and the position of the corresponding scan line, the preset of each pixel being charged in the TP during the precharged picture period can be determined. Grayscale value. § During the third period, TRE3 can also use another overdrive lookup table to determine the overdrive voltage required to charge the pixel to the second side. The overdrive lookup table as shown, on the left The block indicates the preset grayscale value driven by the TP during the precharge screen, and the upper field indicates the second target grayscale value of the pixel, which can be determined based on the overdrive lookup table. Each of the pixels on the liquid crystal display panel 403 is charged to the third period TRE3 to The second target voltage value required for the two target gray scale values. It can be seen from the above that the TP and the third period TRE3 are applied to the halogen during the precharged rake period through the overdrive lookup table of FIG. 7A and FIG. 7B. The over-voltage of the liquid crystal display panel 403 can be charged and displayed on the pre-charge screen period TP and the third period TRE3. The phenomenon of image sticking occurs, and the display quality of the liquid crystal display panel 403 is lowered. The above embodiment is a method of pre-charging the pixels on all the scanning lines on the liquid crystal display panel 403 to avoid the occurrence of image sticking on the back surface. Not limited to this. In some embodiments, the pixel corresponding to the first scan line 13 201205545 rvowo^^^ZlTW 34508twf.doc/n may have sufficient reaction time to make the liquid crystal go to the preset gray scale value, so It is necessary to precharge the τρ during the precharge screen, and only the step of precharging the scan line having insufficient reaction time (that is, the scan line driven later in the first period TRE1) is required. For example, FIG. 8 is a timing chart showing a stereoscopic face when a driving method according to another embodiment of the present invention is used. It is assumed that the liquid crystal display panel 403 has 1024 scan lines, wherein the first 250 scan lines have sufficient reaction time when updating the display screen, so that the liquid crystal can be turned to the target gray scale 榼 state, and the later driven 774. The scanning line lacks sufficient reaction time. Therefore, during the pre-charging process, only the 774 scanning lines that are driven later are subjected to the above-described pre-charging step, and the detailed pre-charging method has been taught in the above embodiment, and therefore will not be described again. In summary, the present invention charges the pixels of the liquid crystal display panel to a preset gray scale value in a partial interval of the second period to reduce the time required for the liquid crystal to go to the positioning, and improve the image sticking phenomenon of the liquid crystal display panel. . The precharged pixel can be selectively defined as a pixel corresponding to a later driven scan line on the liquid crystal display panel to improve the power saving efficiency of the liquid crystal display panel. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional stereoscopic display device. 14 201205545 ▲ www^wXXZlTW 34508twf.doc/n Figure 2 is a timing diagram of the stereoscopic display device of Figure i when displaying a stereoscopic picture. Figure 3 is a graph showing the relationship between the scan line driving time and the liquid crystal reaction time. 4 is a schematic view of a stereoscopic display device according to an embodiment of the present invention. Fig. 5 is a flow chart showing a method of driving a stereoscopic display device and a liquid crystal display panel thereof according to an embodiment of the present invention. Lu 胄 6 is not a timing diagram when the stereoscopic surface is displayed using the driving method of Fig. 5. 7A-7B illustrate an overdrive lookup table that is not an embodiment of the present invention. FIG. 8 is a diagram showing the timing of displaying a stereoscopic surface according to another embodiment of the present invention. [Main component symbol description] 20 Display device 22 Liquid crystal display panel 24 Backlight module 30 Glasses 32 Right lens 34 Left lens 400. Display panel 402. Liquid crystal display device 403: Liquid crystal display panel 15 34508twf.doc/n 201205545 404: Viewing device Wb: View window TRE1: First period THP: Second period TRE3: Third period TH: Hold 昼Surface period TP: Precharged surface period T: Frame rate TA: Update time® TB: Blank time t0, tl, t2: Time to wait for the pulse signal to be driven P1: Scan pulse signals TR0, TR1, TR2: Reaction time
Wl、W2 :觀視窗 S502〜S508 :液晶顯示面板的驅動方法步驟 16Wl, W2: View window S502~S508: Steps of driving the liquid crystal display panel 16