1277936 玖、發明說明 【發明所屬之技術領域】 本發明係有關於一種驅動太、土好 ! ^動方法，特別是盥一 器之驅動方法有關。 /、 夜日日顯示 【先前技術】 最近’液晶顯示器元件因為其具有體積小傲低耗電旦 特性，因此已被廣泛的使用在各 —-里之 為電視和圖像顯示螢幕等二：兀件中’例如作 體作為切換元件之主動陣列型式中，使用薄膜電晶 與大尺寸優點。 具有高顯示品質 一作為切換用之主動亓杜< s, Λ1 ^ 動7^件（例如薄膜電晶體）為一主動 陣列型液晶顯示器之主要部分，一晝 動 連。該畫素電極形成於一主動 列i 凡件相 列基板對向放置之對向夷板=71基板上’而-和此陣 &⑽板场成有共同電極，-液晶層位 於此兩基板間’兩偏極板分別放置在此兩基板之外側。 參閱第1圖所示為傳統主動陣列型液晶顯示器之一個 畫素區域之等效電路圖。其中一 N型薄膜電晶請形成 於訊號線101與掃描線1〇3之交叉點上，N型薄膜電晶體 105之汲極電極（D) iG7與影像訊號線⑻相接，間極電 極j G ) 1 09與掃描線】〇3相接，而源極電極（s ) Η 1與畫 素電極113相接。一液晶層119放置於晝素電極m與共同 電極U 7中，此畫素電極11 3與共同電極11 7會形成一液晶 1277936 電谷（CLC)’而此共同電極117與一共同電極電壓產生電路 115相接。一儲存電容（Cs) 123由畫素電極113與儲存電 容電極121所形成，此儲存電容電極121與一共同電極電壓 產生電路11 5相接。 傳統上有兩種操作方式，一種是使用一與影像訊號電壓 (Vx)反相之共同電極電壓（vc)，施加於共同電極117上， 用以降低影像訊號所需之放大倍數，如第2 A圖所示。另一 種是使用固定之共同電極電壓（Vc)施加於共同電極U7 上，如第2B圖所示。 參閱第3圖所示為傳統主動陣列型液晶顯示器之驅動 波开> 圖，請同時參閱第1圖。一掃描訊號、經由掃描線工 施加於薄膜電晶體105之閘極電極（g) 109上，影像訊號 電壓被施加於影像訊號線1 〇 1上。當掃描訊號施加於問 極電極（G)109上時，影像訊號電壓會被寫入畫素電極113, 形成一個晝素電極電壓（Vs)。 在一圖場週期内，共同電極電壓（Vc )和晝素電極電 壓（Vs)間會產生一個電壓差，假設為Vp，此電壓差施加於 液晶電容（cLC)上，造成儲存於其中之液晶層119旋轉而 顯現出影像。而另-方面’此電壓差Vp亦會施加於儲存電 容（Cs)123上，此儲存電容是作為當掃描訊號、移走時， 讓液晶電容（CLC )保持在一固定電壓差以維持顯像。 然而，請再次參閱f i圖所示，對一個薄膜電晶體而 言’在閘極（G”09與源極（s) lu間和汲極⑼ 與源極（S)⑴間會分別存有寄生電容Cgs和Cds。 1277936 ，今CGS和cDs當掃插訊號Vy移走時，會造成晝素電極1277936 玖 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明/, night display [prior technology] Recently, 'liquid crystal display elements because of its small size, low power consumption and low power consumption characteristics, it has been widely used in each - in the TV and image display screen two: 兀In the active array type, for example, as a switching element, thin film electro-crystals and large size advantages are used. It has a high display quality. It is used as an active 切换 & & Λ ^ ^ ^ ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The pixel electrode is formed on an active column i, the opposite phase of the substrate is oppositely disposed on the substrate=71 substrate and the array and the (10) plate field are formed with a common electrode, and the liquid crystal layer is located on the two substrates. The two polarizing plates are respectively placed on the outer sides of the two substrates. Refer to Figure 1 for an equivalent circuit diagram of a pixel area of a conventional active array type liquid crystal display. An N-type thin film transistor is formed at the intersection of the signal line 101 and the scanning line 1〇3, and the drain electrode (D) of the N-type thin film transistor 105 is connected to the image signal line (8), and the inter-electrode electrode j G) 1 09 is connected to the scan line 〇3, and the source electrode (s) Η 1 is connected to the pixel electrode 113. A liquid crystal layer 119 is placed in the pixel electrode m and the common electrode U7. The pixel electrode 11 3 and the common electrode 11 7 form a liquid crystal 1277936 electric valley (CLC)' and the common electrode 117 and a common electrode voltage are generated. Circuit 115 is connected. A storage capacitor (Cs) 123 is formed by the pixel electrode 113 and the storage capacitor electrode 121. The storage capacitor electrode 121 is connected to a common electrode voltage generating circuit 115. Traditionally, there are two modes of operation. One is to apply a common electrode voltage (vc) inverted from the image signal voltage (Vx) to the common electrode 117 to reduce the magnification required for the image signal, such as the second. Figure A shows. The other is applied to the common electrode U7 using a fixed common electrode voltage (Vc) as shown in Fig. 2B. Refer to Figure 3 for the drive wave on the traditional active array LCD. See also Figure 1. A scan signal is applied to the gate electrode (g) 109 of the thin film transistor 105 via a scan line, and the image signal voltage is applied to the image signal line 1 〇 1. When a scan signal is applied to the electrode electrode (G) 109, the image signal voltage is written to the pixel electrode 113 to form a halogen electrode voltage (Vs). During a field period, a voltage difference is generated between the common electrode voltage (Vc) and the halogen electrode voltage (Vs), assuming Vp, which is applied to the liquid crystal capacitor (cLC) to cause liquid crystals stored therein. Layer 119 rotates to reveal an image. On the other hand, this voltage difference Vp is also applied to the storage capacitor (Cs) 123. This storage capacitor is used to maintain the liquid crystal capacitance (CLC) at a fixed voltage difference to maintain the image when the signal is scanned and removed. . However, please refer to the fi diagram again. For a thin film transistor, there will be parasitic between the gate (G"09 and the source (s) lu and between the drain (9) and the source (S) (1). Capacitors Cgs and Cds. 1277936, today CGS and cDs will cause the halogen electrode when the sweep signal Vy is removed.
電壓（Vs)下卩备_ VUnder voltage (Vs) _ V
Vp值。此△ Vp值會造成液晶螢幕閃爍之 【發明内容】 所1於、上述之發明背景所述，△ v p值與液晶顯示器品 =之k劣具有很大之關係，因為若液晶顯示幕上每一個顯 不π件之△ Vp值不同，會造成液晶螢幕有閃爍之情形發 生’造成液晶螢幕品質下降。因此實需有一理想的解決 方法來避免液晶螢幕之閃爍情況發生。 、本t明的主要目的即是在提供一種液晶顯示器之驅動 方法，旎降低△ Vp值和緩液晶螢幕閃爍之情形。 本發明另一目的為提供一種液晶顯示器之驅動方法，藉 由和緩掃描訊號波形來降低Δνρ值。 本發明再一目的為提供一種液晶顯示器之驅動電路，能 降低AVp值和緩液晶螢幕閃爍之情形。 本卷明又一目的為提供一種提供一種液晶顯示器之驅 動電路，在掃描訊號移走時產生如RC放電般之波形，藉以 降低AVp值以和緩液晶螢幕閃爍之情形。 根據上述之目的，本發明提供一種液晶顯示器驅動電路 與方法’利用在主動陣列型液晶顯示器内之薄膜電晶體導通 之時間内，利用其中之-部份時間，讓掃描訊號經由一 RC 放電波形產生電路來由高位準轉換成低位準。 而本發明之驅動電路結構至少包括一電源電路、一多工 1277936 器和一 RC放電波形產生電路。主動陣列型液晶顯示器透過 多工裔選擇連接電源電路或RC放電波形產生電路。當掃描 訊號係用以切換薄膜電晶體導通時，係由電源電路提供掃描 信號電源，而當掃描訊號係用以關閉薄膜電晶體時則由rc 放電波形產生電路供應電源。 【實施方式】 在不限制本發明之精神及應用範圍之下，以下即以一實 施例，介紹本發明之實施；熟悉此領域技藝者，在瞭解本發 明之精神後，當可應用本發明之驅動電路和其方法於各種不 同之液晶顯示器中。由於△ Vp值與液晶顯示器品質之優 劣具有很大之關係，然而傳統之驅動電路和驅動方法，於 掃描訊號移走時常常會造成液晶顯示幕上每一個顯示元件 之△ Vp值劇烈變化，使得液晶螢幕有閃爍之情形發生。 因此’本發明提出一種液晶顯示器驅動電路和驅動方法，將 電源電路外接一 RC放電波形之產生電路，當移走掃描訊號 日守’此知^田訊號會經由一 RC放電波形由一高位準轉換為一 低位準’藉由掃描訊號之高低位準和緩變化，來降低△ Μ 值以減少液晶螢幕閃爍之情形。以下即以一實施例說明本 發明之應用’但值得注意的是，此實施例並不用以限定本發 明之範圍。 請再次參閱第3圖所示傳統主動陣列型液晶顯示器之 驅動波形圖，同時請參閱第1圖，假設於Tl時，當一掃描 訊號（vy)經由掃描線施加於薄膜電晶體105之閘極電極 1277936Vp value. The ΔVp value causes the liquid crystal screen to flicker. [Invention] In the above-mentioned background of the invention, the Δvp value has a great relationship with the liquid crystal display product, because if each of the liquid crystal display screens If the Vp value is different, it will cause the LCD screen to flicker. This will cause the LCD screen quality to drop. Therefore, there is an ideal solution to avoid the flickering of the LCD screen. The main purpose of the present invention is to provide a driving method for the liquid crystal display, which reduces the ΔVp value and slows down the flickering of the liquid crystal screen. Another object of the present invention is to provide a driving method for a liquid crystal display, which reduces the value of Δνρ by gently scanning the signal waveform. It is still another object of the present invention to provide a driving circuit for a liquid crystal display which can reduce the AVp value and slow the liquid crystal screen flicker. Another object of the present invention is to provide a driving circuit for a liquid crystal display which generates a waveform such as an RC discharge when the scanning signal is removed, thereby reducing the AVp value to slow down the liquid crystal screen. According to the above object, the present invention provides a liquid crystal display driving circuit and method for utilizing a portion of the time during which the thin film transistor is turned on in the active array type liquid crystal display to generate a scanning signal via an RC discharge waveform. The circuit is converted from a high level to a low level. The driving circuit structure of the present invention comprises at least a power supply circuit, a multiplex 1277936 and an RC discharge waveform generating circuit. The active array type liquid crystal display is connected to a power supply circuit or an RC discharge waveform generating circuit through a multiplexed operation. When the scanning signal is used to switch the film transistor conduction, the power supply circuit supplies the scanning signal power, and when the scanning signal is used to turn off the thin film transistor, the rc discharge waveform generating circuit supplies power. The embodiments of the present invention are described below by way of an embodiment without departing from the spirit and scope of the present invention. Those skilled in the art, after understanding the spirit of the present invention, may apply the present invention. The drive circuit and its method are used in a variety of different liquid crystal displays. Since the ΔVp value has a great relationship with the quality of the liquid crystal display, the conventional driving circuit and the driving method often cause the ΔVp value of each display element on the liquid crystal display to change drastically when the scanning signal is removed, so that The LCD screen flickers. Therefore, the present invention provides a liquid crystal display driving circuit and a driving method, and the power supply circuit is externally connected to an RC discharge waveform generating circuit, and when the scanning signal is removed, the Japanese signal will be converted from a high level via an RC discharge waveform. For a low level, the Δ 值 value is reduced by scanning the high and low levels of the signal to reduce the flicker of the LCD screen. In the following, the application of the present invention will be described by way of example only, but it should be noted that this embodiment is not intended to limit the scope of the invention. Please refer to the driving waveform diagram of the conventional active array type liquid crystal display shown in FIG. 3 again. Referring to FIG. 1 , it is assumed that when T1 is applied, a scanning signal (vy) is applied to the gate of the thin film transistor 105 via the scanning line. Electrode 1277936
上’此時影像訊號電壓會被寫入晝素電極11 3，形士 ，A U战一個畫 素電極電壓（Vs)。液晶電容（CLC)和儲存電容一 、)會充 電至相對於畫素電極電壓（Vs)和共同電極電壓（vc)門之帝 壓差Vp。而當掃描訊號（vy)於時間T2被移走砗 ^ 可，溥膜電 晶體105被關閉，此時液晶電容（Clc)兩端之電壓是藉由 儲存電容（Cs )維持住，但是在薄膜電晶體丨05 ^ 殿關閉之 瞬間’ Vp會下降一 △ Vp值，此△ Vp值之大小鱼 /、溽膜電晶體 之閘極源極間之寄生電容Cgs、液晶電容（Ct φ六, Lc」和铸存 電谷（Cs)以及伯膜電晶體105由導通狀態切換 入 0B Ub At 、元全關 閉狀恶所經歷之電壓差（△ V )有關，其大小如下式所示· AVp-^xCgs/(Cgs+Clc+Cs) 然而，若假設薄膜電晶體105之啟始電壓為Vt，僅有在 掃描訊號（Vy)低於啟始電壓為％時，薄臈電晶體1〇5才會 被完全關閉，換言 <，在傳統之掃描訊號波形下，於時二 T2時，其掃描訊號（Vy)是瞬間由高電壓u換成二 電壓vGate_Qff，因此薄膜電晶體1〇5由導通狀態切換至完全關 閉狀態所經歷之電壓差△鸲Vcate__VQ_ff。 參閱第4圖所示為根據本發明較佳實施例之主動陣列 型液晶顯示器之驅動波形圖，其與傳統驅動波形之最大不同 ,占在；|方法將薄膜電晶體從導通狀態切換至關閉狀態 了二^動波开乂類似於一 RC放電波形，亦即掃描訊號（Vy ) 疋L過&日$間（ΛΤ，如第4圖所示）才由高電位轉換 1277936 成低電位vGate_Qff。因此薄膜電晶體1〇5由導通狀態切換 全關閉狀態所經歷之電壓差△為 70 _ n ^ 电全左兩（VT-VGate_off)。此時薄腺 電晶體關閉時戶斤土、> Λ λ7 & . ' 一 才斤k成之△ Vp值，與切換電壓間之關係如下 所示： P (Vt ^Gate-off ) X C〇s /(C〇s + Cw + C^) 由於本發明於切換薄膜電晶體從導通狀態至關閉狀態 呀之電壓變化△ V'小於傳統掃描訊號波形造成之電壓差△ V，因此本發明之掃描訊號驅動波形可形成一較小之△ Vp 值。值彳于注意的是，本發明之驅動方法亦可用於驅動其他種 類之液晶顯示器。 多閱弟5圖所示為用以產生本發明驅動波形之電路結 構圖。至少包括一電源電路5〇〇、一多工器5〇2和一尺(：放 電波形產生電路504。電源電路500提供一主動陣列型液晶 顯示器506所需之各種電源，一般而言，邏輯電路部分係使 用3.3V，Gamma電路部分使用9V，而薄膜膜電晶體之導通 使用23V，關閉則使用-6V，其中供應掃描線路之高電壓部 分會與本發明之多工器502相接，而多工器502會在與一 RC放電波形產生電路504相接。 RC放電波形產生電路504係由一反向器508、一切換 電晶體510與一由電阻512和電容514組成之Rc電路所構 成’其中反向器5 0 8會外接一訊號Μ，以控制切換電晶體 5 1 0之導通，當切換電晶體5丨〇是於導通狀態時，電容$ 14 10 1277936 會被充電至高電壓，當當切換電晶體510處於關閉狀態時， 電容514會對電阻512進行放電，而產生一 RC放電波形。 多工器502亦會受一外接訊號M控制，決定主動陣列型液 晶顯示器506所需電源係由電源電路5〇〇所提供或是由rc 放電波形產生電路504來提供。值得注意的是，上述之Rc 放電波形產生電路504之電路結構僅為一實施例，其他能產 生RC放電波形之電路均可應用在本發明中。 參閱第6圖所示為本發明較佳實施例所使用之波形 圖，請同時參閱第5圖。其中CPV代表時脈訊號，而“訊 號為分別施加於多工器502與RC放電波形產生電路5〇4之 控制訊號，而N訊號代表施加於第N條掃描線之掃描訊號。 例如，假設於T3時，多工器502之外接訊號M之低位準選 擇由電源電路500提供主動陣列型液晶顯示器5〇6掃描訊號 所需之高電壓，來導通薄膜電晶體，則於RC放電波形產生 電路504部分，外接訊號M之低位準經由一反向器5〇8轉 換成高位準，而導通切換電晶體51〇，此時一 23V之高電壓 會經由切換電晶體510對電容514進行充電至23v。 接著，若於T4時，多工器5〇2之外接訊號M切換至高 位準，此時多工器502選擇由rc放電波形產生電路5〇4提 供主動陣列型液晶顯示器5〇6掃描訊號所需之電源，此時於 RC放電波形產生電路5〇4部分，其外接訊號μ之高位準經 由一反向器508轉換成低位準，而將切換電晶體51〇關閉， 電备514會對電阻512進行放電，而產生一 rc放電波形， 並施加於主動陣列型液晶顯示器5〇6，此時掃描訊號會經由 11 1277936 该RC放電波形由一高位準轉換為一低位準。 本發明之方法為了搭配使用者不同之需求，可藉由改變 第5圖中之電阻尺值與電容c值而獲得多種不同之rc放 電波形’進而形成多種不同之掃描訊號。參閱第7圖所示為 根據本發明其他實施例所形成之不同掃描訊號波形圖，請同 時參閱第5圖，可藉由調整電阻512以及電容514之大小， 進而改變電容514對電阻512之放電速度形成不同之Rc放 電波形。因此掃描訊號電壓可利用不同之RC放電波形而自 面位準Vgate-C)n電壓轉換至使用者藉由改變放電速度而預 定出之低位準電壓，如第7圖中所示之VI、V2......等，其 >中此低位準電壓應介於和Vgat_ff之間。此外，當m Λ號轉換至低位準時，多工器5〇2會選擇電源電路$⑽與主 動陣列型液晶顯示器506相接，因此掃描訊號電壓會從低位 準電壓VI、V2......瞬間下降至Vgate-w。 根據本發明之驅動方法，是利用在主動陣列型液晶顯示 器内之薄膜電晶體導通之時間内，利用其中之一部份時間， 讓知描訊號經由一 RC放電波形產生電路來由高位準轉換 ，低位準，因為本方法並非如傳統般，在切換薄膜電晶體狀 怨時，是其掃描訊號是一瞬間從高電壓切換至低電壓，而是 如放電般讓電壓和緩下降，因此能將薄膜電晶體從導通 狀恶切換至關閉時真正所需之電壓變化確實反應在 點上。 f 6雖然本發明已以一較佳實施例揭露如上，然其並非用以 限疋本發明，任何熟習此技藝者，在不脫離本發明之精神和 12 1277936 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、和優點能更明顯 ，下文特舉一較佳實施例，並配合所附圖式， 」、 明如下： 叶細况 第1圖所不為傳統主動陣列型液晶顯示器之一 區域之等效電路圖； |常 晶顯示器 第2A圖與第2B圖所示為傳統主動陣列型液 之驅動波形圖； 團， rsrt · 圖， 第5圖所不為根據本發較佳實施例產生Rc放電 驅動電路概略圖； 第6圖所不為根據本發明較佳實施例之控制信 描信號之波形圖·，以及 〜與知 第7圖所不為根據本發明其他實施例所形 描訊號波形圖。 不问知 第3圖所不為傳統掃描訊號造成電壓下降之驅動波形 第4圖所不為根據本發較佳實施例所使用之驅動波彤 之 103掃描線 元件代表符號簡單說明】 1 〇 1影像訊號線 13 1277936 105 N型薄膜電晶體 107汲極電極（D) 109閘極電極（G) 111源極電極（S) 113晝素電極 · 115共同電極電壓產生電路 ‘ 11 7共同電極 119液晶層 121儲存電容電極 123儲存電容（Cs) 500電源電路 502多工器 504 RC放電波形產生電路 籲 506主動陣列型液晶顯示器 508反向器 510切換電晶體 ’ 512電阻 514電容 ·At the time, the image signal voltage is written to the pixel electrode 11 3, and the shape of the A, the A U is a pixel voltage (Vs). The liquid crystal capacitor (CLC) and the storage capacitor are charged to a voltage difference Vp with respect to the pixel voltage (Vs) and the common electrode voltage (vc). When the scanning signal (vy) is removed at time T2, the germanium film 105 is turned off, and the voltage across the liquid crystal capacitor (Clc) is maintained by the storage capacitor (Cs), but in the film. The transistor 丨05 ^ The moment when the temple is closed' Vp will drop by △ Vp value, the magnitude of this ΔVp value, the parasitic capacitance Cgs of the gate source of the fish/film, and the liquid crystal capacitance (Ct φ6, Lc It is related to the voltage difference (ΔV) experienced by switching the electric storage valley (Cs) and the primary film transistor 105 from the conduction state to 0B Ub At and the full-closed noise. The size is as follows: AVp-^ xCgs/(Cgs+Clc+Cs) However, if the starting voltage of the thin film transistor 105 is assumed to be Vt, only the scanning signal (Vy) is lower than the starting voltage of %, the thin germanium transistor 1〇5 will It is completely turned off, in other words, under the traditional scanning signal waveform, when the time is T2, the scanning signal (Vy) is instantaneously changed from the high voltage u to the second voltage vGate_Qff, so the thin film transistor 1〇5 is turned on. The voltage difference Δ鸲Vcate__VQ_ff experienced when switching to the fully off state. See Figure 4 for The driving waveform diagram of the active array type liquid crystal display according to the preferred embodiment of the present invention is different from the conventional driving waveform, and the method occupies the thin film transistor from the on state to the off state. An RC discharge waveform, that is, a scan signal (Vy) 疋L over & day (between 如, as shown in Fig. 4) is converted from a high potential of 1277936 to a low potential vGate_Qff. Therefore, the thin film transistor 1〇5 is turned on. The voltage difference Δ experienced by the state switching full-off state is 70 _ n ^ electric left two (VT-VGate_off). At this time, when the thin gland transistor is turned off, the household soil, > Λ λ7 & . The relationship between the Vp value and the switching voltage is as follows: P (Vt ^Gate-off ) XC〇s /(C〇s + Cw + C^) Since the present invention switches the thin film transistor from the on state to The voltage change ΔV' of the off state is smaller than the voltage difference ΔV caused by the conventional scan signal waveform, so the scan signal driving waveform of the present invention can form a small ΔVp value. It is noted that the driving of the present invention Method can also be used to drive other types of liquid crystal display The multi-diagram 5 is a circuit structure diagram for generating the driving waveform of the present invention, and includes at least one power supply circuit 5, one multiplexer 5〇2 and one foot (: discharge waveform generating circuit 504. The circuit 500 provides various power supplies required for an active array type liquid crystal display 506. Generally, the logic circuit portion uses 3.3V, the Gamma circuit portion uses 9V, and the thin film transistor is turned on using 23V, and the turn-off is used at -6V. The high voltage portion of the supply scan line is coupled to the multiplexer 502 of the present invention, and the multiplexer 502 is coupled to an RC discharge waveform generating circuit 504. The RC discharge waveform generating circuit 504 is composed of an inverter 508, a switching transistor 510 and an Rc circuit composed of a resistor 512 and a capacitor 514. The inverter 508 is externally connected with a signal 控制 to control the switching. The transistor 5 10 is turned on. When the switching transistor 5 is in the on state, the capacitor $ 14 10 1277936 is charged to a high voltage. When the switching transistor 510 is in the off state, the capacitor 514 discharges the resistor 512. And generate an RC discharge waveform. The multiplexer 502 is also controlled by an external signal M. The power required to determine the active array type liquid crystal display 506 is provided by the power supply circuit 5 or by the rc discharge waveform generating circuit 504. It is to be noted that the circuit configuration of the Rc discharge waveform generating circuit 504 described above is only an embodiment, and other circuits capable of generating an RC discharge waveform can be applied to the present invention. Referring to Figure 6, there is shown a waveform diagram for use in a preferred embodiment of the present invention. Please also refer to Figure 5. Wherein CPV represents a clock signal, and "the signal is a control signal applied to the multiplexer 502 and the RC discharge waveform generating circuit 5〇4, respectively, and the N signal represents a scan signal applied to the Nth scan line. For example, suppose At T3, the low level of the external signal 502 of the multiplexer 502 is selected by the power supply circuit 500 to provide the high voltage required for the active array type liquid crystal display 5 to 6 scan signals to turn on the thin film transistor, and then the RC discharge waveform generating circuit 504 In part, the low level of the external signal M is converted to a high level via an inverter 5〇8, and the switching transistor 51 is turned on. At this time, a high voltage of 23V charges the capacitor 514 to 23v via the switching transistor 510. Then, if at T4, the multiplexer 5〇2 is switched to the high level, and the multiplexer 502 selects the rc discharge waveform generating circuit 5〇4 to provide the active array type liquid crystal display 5〇6 scanning signal. The power supply is required. At this time, in the RC discharge waveform generating circuit 5〇4, the high level of the external signal μ is converted to a low level via an inverter 508, and the switching transistor 51 is turned off, and the power supply 514 is turned on. 512 The RC discharge waveform is generated and applied to the active array type liquid crystal display 5〇6, and the scan signal is converted from a high level to a low level via the 11 1277936. The method of the present invention is matched with Different requirements of the user can obtain a plurality of different rc discharge waveforms by changing the resistance value and the capacitance c value in FIG. 5 to form a plurality of different scanning signals. See FIG. 7 for other different according to the present invention. For the different scan signal waveforms formed in the embodiment, please refer to FIG. 5 again, and the size of the resistor 512 and the capacitor 514 can be adjusted to change the discharge speed of the capacitor 514 to the resistor 512 to form a different Rc discharge waveform. The voltage can be converted from the surface level Vgate-C)n voltage to the low level voltage predetermined by the user by changing the discharge speed by using different RC discharge waveforms, such as VI, V2 shown in FIG. ...etc., the low level voltage in > should be between Vgat_ff. In addition, when the m Λ sign is switched to the low level, the multiplexer 5〇2 selects the power supply circuit $(10) and the active array. The liquid crystal display 506 is connected, so that the scanning signal voltage is instantaneously dropped from the low level voltages VI, V2, ... to Vgate-w. The driving method according to the present invention is to use the film in the active array type liquid crystal display. During the period when the transistor is turned on, one of the parts of the time is used to allow the known signal to be converted from a high level to a low level via an RC discharge waveform generating circuit, because the method is not as conventional as in switching thin film transistors. When the scan signal is switched from a high voltage to a low voltage for a moment, the voltage is gently lowered as a discharge, so the voltage change that can be actually required to switch the thin film transistor from the on-state to the off state does react. Point. The present invention has been disclosed in a preferred embodiment as described above, but it is not intended to limit the invention, and any person skilled in the art without departing from the spirit of the invention and 12 1277936 [simple description of the drawings] The above and other objects, features and advantages of the present invention will become more apparent. The preferred embodiments of the invention are described below, and in conjunction with the accompanying drawings, which are as follows: The first detail of the leaf is not the conventional active array type liquid crystal. The equivalent circuit diagram of one area of the display; the 2A and 2B of the constant crystal display show the driving waveform of the conventional active array type liquid; the group, rsrt · picture, Fig. 5 is not preferred according to the present invention. The embodiment produces a schematic diagram of the Rc discharge driving circuit; FIG. 6 is a waveform diagram of the control signal according to the preferred embodiment of the present invention, and is not according to other embodiments of the present invention. Shaped waveform waveform. It is not known that the driving waveform which is not caused by the voltage drop of the conventional scanning signal in FIG. 4 is not a simple description of the representative symbol of the scanning line element of the driving wave used in the preferred embodiment of the present invention] 1 〇1 Image signal line 13 1277936 105 N-type thin film transistor 107 drain electrode (D) 109 gate electrode (G) 111 source electrode (S) 113 pixel electrode · 115 common electrode voltage generating circuit ' 11 7 common electrode 119 liquid crystal Layer 121 storage capacitor electrode 123 storage capacitor (Cs) 500 power circuit 502 multiplexer 504 RC discharge waveform generation circuit 506 active array type liquid crystal display 508 inverter 510 switch transistor '512 resistor 514 capacitor ·
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