201133442 六、發明說明： 【發明所屬之技術領域] 本發明係有關於一種顯示裝置的殘影改善電路及方法且 特別係有關於可改善顯示裝置之關機殘影的電路、方法及其應 用的顯示裝置。 '‘ 【先前技術】 目前，液晶顯示裝置（Liciuid Crystal Display，LCD)已廣泛 籲地應用於各種電子產品上。通常，液晶顯示裝置係使用殘影改 善電路來改善關機時的殘影現象，其原理係在關機時以控制訊 號（XAO)透過殘影改善電路來強迫間極驅動器的閉極輸出為閑 極高準位’因而閘極驅動器可開啟液晶顯示面板内之所有掃描 線以中和液晶顯示面板之像素内所殘留的電荷，藉此來達到消 除液晶顯示裝置關機殘影的目的。 然而，當液晶顯示裝置關機時，若提供給問極驅動器的閉 極驅動開啟電壓(VGH)的放電速度過快時，則閘極驅動器無法 順利開啟液晶顯示面板内的所有掃描線來中和液晶顯示面板 之像素⑽殘留的電荷，因而無法達到消除殘影的目的。 【發明内容】 因此本發明之-方面係在於提供—種顯示裝置的殘影改 善電路及方法，藉以改善顯示裝置在關機時間極驅動開啟電壓 放電過快的情形’因而可確實地改善關機殘影問題。 根據本發明之實施例，本發明之顯示裝㈣殘影改善電路 包含二端元件，其中二端元件具有第—端__ 端點係搞接於電㈣換器的高電位端點，第二端點係耗接於間 201133442 =驅動電路的閑極高電位端點。其中，當顯示裝置關機時，二 端元件為導通’且電壓轉換器提供操作電壓至閘極高電位端 點。 又，根據本發明之實施例，本發明之顯示裝置的殘影改善 電路^含三端^件，其中三端元件具有第—端點、第二端點及 第三端點，第一端點係耦接於電壓轉換器的高電位端點，第二 端點係純於閘極驅動祕的雜高電㈣點，第三端點係用 以接收導通控制信號。其中’當顯示裝置關機時，三端元件係 根據導通控制信號來導通，且電壓轉換器提供操作電壓至閑極 高電位端點。 又，根據本發明之實施例，上述之殘影改善電路可應用於 液晶顯示裝置。 又，根據本發明之實施例，本發明之改善關機殘影的方法 包含如下步驟··_顯示裝置是否關機；以及當制到顯示裝 置為關機時’利用電壓轉換器來提供操作電壓至閘極驅動電路 的閘極高電位端點。 因此，本發明的顯示裝置的殘影改善電路及方法可在顯示 裝置關機時維持住閘極驅動開啟電壓，藉以確實地改善液晶顯 示裝置的關機殘影問題。 【實施方式】 為讓本發明之上述和其他目的、特徵、優點與實施例能更 明顯易懂’本說明書將特舉出一系列實施例來加以說明。但值 得注意的是’此些實施例只係用以說明本發明之實施方式，而 非用以限定本發明。 請參照圖1，其顯示依照本發明之第一實施例之液晶顯示 201133442 裝置的示意圖。本實施例的液晶顯示裝置100包含液晶顯示面 板110、背光模組120、電壓轉換器130及殘影改善電路14〇。 液晶顯示面板110係相對於背光模組120設置，背光模組12〇 係用以提供液晶顯示面板110 —背光源。電壓轉換器13〇係電 性連接於液晶顯示面板110,用以轉換一電源（未繪示）的電壓， 藉以提供液晶顯示面板110所需的多個系統電壓（system voltages)，例如：共同電壓Vcom、閘極驅動開啟電壓vGH、閘 極驅動關閉電壓V〇l及邏輯操作電壓Vcc。殘影改善電路140 φ 係電性連接於液晶顯示面板110和電壓轉換器130之間，用以 改善液晶顯示裝置100的殘影問題。 如圖1所示’本實施例的液晶顯示面板110包含基板ln、 複數個像素112、複數條資料線113、複數條閘極線114、資料 驅動電路115、閘極驅動電路116及信號控制器117。基板m 可例如為玻璃基板或可撓性塑膠基板，在本實施例中，基板m 可例如為薄膜電晶體（Thin Film Transistor，TFT)陣列基板，且 液晶顯示面板110可更包含液晶層（未繪示）和另一基板（未繪 • 示）’此另一基板例如為彩色濾光片（Color Filter，CF)基板，其 相對於基板111設置，此時，液晶層係形成於TFT陣列基板（基 板111)和CF基板之間。然不限於此，在一些實施例中，彩色 濾光片和薄膜電晶體陣列亦可配置在同一基板上（亦即C〇l〇r Filter on Array > COA) ° 如圖1所示，液晶顯示面板11 〇的資料線113和閘極線1 i 4 係相互交錯地配置於基板111上’像素112係以矩陣形式來配 置於基板111上，並位於資料線113和閘極線Π4之間，資料 驅動電路115係輕接於資料線113的一側，並設有資料驅動 IC(未繪示）’用以驅動資料線113，閘極驅動電路116係輕接於 201133442 閘極線m的-側’並設有閘極驅動IC(未繪示），用以驅動間 極線114。信號控制_ 117係、電性連接於資料驅動電路ιΐ5和 閘極驅動電路U6,用以控制資料驅動電路115和閘極驅動電 路116。信號控制器117可提供資料控制信號c〇NTi以及處理 過的影像資料信號DAT至資料驅動電路115，並提供閘極控制 信號CONT2至閘極驅動電路i! 6。資料控制信號c〇ntι可包 括例如水平啟動信號（STH)、負載信號（L〇ad)、資料時脈信號 (CLK)及極性彳§號（p〇L)。閘極控制信號c〇NT2可包括例如閘 極時脈信號（CPV)、掃描啟動信號（STV)及輸出啟動信號（〇E)。 請參照® 2,λ顯示依照本發明之第一實施例之液晶顯示 面板之像素的不意圖。本實施例的每一像素112可包括驅動電 晶體112a、儲存電容U2b與液晶單元U2c，其驅動電晶體u2a 的閘極係電性連接至閘極線114,驅動電晶體112a的源極係電 ίί連接至> 料線113，驅動電晶體ii2a的汲極係電性連接至储 存電容112b的一端，儲存電容112b的另一端係耦接於共同電 壓Vcom，而液晶單元112C的一端係電性連接於儲存電容 112b’液晶單元112c的另一端係電性連接至共同電壓ycom .〇 請參照圖2和圖3 ’圖3顯示依照本發明之第一實施例之 電壓轉換器與殘影改善電路的方塊示意圖。本實施例的電壓轉 換器130可包括升壓單元（positive charge pUmp)i3i和降壓單元 (Negative charge pump) 132。當本實施例的液晶顯示裝置ι〇〇 在開機模式時’液晶顯示裝置100的電源可供電給電壓轉換器 130，此時’電壓轉換器130可提供操作電壓vDDA至液晶顯示 面板110的閘極驅動電路116，操作電壓VDDA包括一高電位電 壓（VdD)與一低電位電壓（Vee) ’此rfj電位電壓Vdd較佳為一正 電壓’並可利用升壓單元131來升壓成閘極驅動開啟電壓 201133442 vGH ’此低電位電壓Vee較佳為一負電壓，並可利用降壓單元 132來降壓成閘極驅動關閉電壓VGL。當資料驅動電路115提 ·· 供資料至像素112時，閘極驅動電路116可經由閘極線114以 電壓vGH來導通驅動電晶體U2a。在驅動電晶艟112a導通後， 資料驅動電路115可經由資料線113來提供資料至像素n2 中。在資料寫入至像素丨12後，此時，閘極驅動電路丨16即供 給像素112電壓vGL，藉以使像素112呈關閉狀態。而像素112 可將資料信號儲存於儲存電容112b中，因而液晶單元112c在 • 下一資料尚未寫入（即驅動電晶體112a再次被導通）之前可持續 顯示。然而，當液晶顯示裝置10〇進入關機模式時，若資料信 號（電荷）仍維持在儲存電容112b内，而未被釋放出，則容易產 生殘影的問題。201133442 VI. Description of the Invention: [Technical Field] The present invention relates to a residual image improving circuit and method for a display device, and particularly to a circuit, method and application thereof for improving shutdown of a display device Device. '' [Prior Art] Currently, liquid crystal display devices (LCDs) have been widely used in various electronic products. Generally, the liquid crystal display device uses an afterimage improving circuit to improve the image sticking phenomenon during shutdown. The principle is to force the closed-circuit output of the interpole driver to be idle when the control signal (XAO) passes through the afterimage improving circuit during shutdown. The position of the gate driver thus turns on all the scanning lines in the liquid crystal display panel to neutralize the residual charge in the pixels of the liquid crystal display panel, thereby achieving the purpose of eliminating the shutdown of the liquid crystal display device. However, when the liquid crystal display device is turned off, if the discharge speed of the closed-circuit drive turn-on voltage (VGH) supplied to the polarity driver is too fast, the gate driver cannot smoothly turn on all the scan lines in the liquid crystal display panel to neutralize the liquid crystal. The residual charge of the pixel (10) of the display panel cannot achieve the purpose of eliminating image sticking. SUMMARY OF THE INVENTION Therefore, an aspect of the present invention is to provide an afterimage improvement circuit and method for a display device, thereby improving a situation in which a display device is driven to turn on a voltage too fast during a shutdown time, thereby reliably improving the shutdown image. problem. According to an embodiment of the present invention, the display device (4) afterimage improvement circuit of the present invention comprises a two-terminal component, wherein the two-terminal component has a first-end __ end point connected to a high-potential end of the electric (four) converter, and a second The endpoint is consumed by the intervening high potential endpoint of the 201133442 = drive circuit. Wherein, when the display device is turned off, the two-terminal component is turned on and the voltage converter supplies the operating voltage to the gate high potential terminal. Moreover, according to an embodiment of the present invention, the image sticking improvement circuit of the display device of the present invention includes three terminals, wherein the three-terminal component has a first end point, a second end point, and a third end point, and the first end point The second end is used to receive the conduction control signal. The second end is pure to the high-power (four) point of the gate driving secret, and the third end is used to receive the conduction control signal. Wherein when the display device is turned off, the three-terminal component is turned on according to the turn-on control signal, and the voltage converter supplies the operating voltage to the idle high potential terminal. Further, according to the embodiment of the present invention, the above-described afterimage improving circuit can be applied to a liquid crystal display device. Moreover, according to an embodiment of the present invention, the method for improving the shutdown image sticking of the present invention includes the following steps: whether the display device is turned off; and when the display device is turned off, 'using a voltage converter to provide an operating voltage to the gate The gate of the drive circuit is at the high potential end. Therefore, the afterimage improving circuit and method of the display device of the present invention can maintain the gate driving turn-on voltage when the display device is turned off, thereby reliably improving the shutdown image sticking problem of the liquid crystal display device. The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; However, it is to be understood that the embodiments are merely illustrative of the embodiments of the invention and are not intended to limit the invention. Referring to FIG. 1, there is shown a schematic diagram of a liquid crystal display 201133442 device in accordance with a first embodiment of the present invention. The liquid crystal display device 100 of the present embodiment includes a liquid crystal display panel 110, a backlight module 120, a voltage converter 130, and an afterimage improving circuit 14A. The liquid crystal display panel 110 is disposed relative to the backlight module 120, and the backlight module 12 is configured to provide a backlight of the liquid crystal display panel 110. The voltage converter 13 is electrically connected to the liquid crystal display panel 110 for converting a voltage of a power source (not shown), thereby providing a plurality of system voltages required for the liquid crystal display panel 110, for example, a common voltage. Vcom, gate drive turn-on voltage vGH, gate drive turn-off voltage V〇l, and logic operating voltage Vcc. The afterimage improving circuit 140 φ is electrically connected between the liquid crystal display panel 110 and the voltage converter 130 to improve the image sticking problem of the liquid crystal display device 100. As shown in FIG. 1 , the liquid crystal display panel 110 of the present embodiment includes a substrate ln, a plurality of pixels 112 , a plurality of data lines 113 , a plurality of gate lines 114 , a data driving circuit 115 , a gate driving circuit 116 , and a signal controller 117. The substrate m can be, for example, a glass substrate or a flexible plastic substrate. In this embodiment, the substrate m can be, for example, a Thin Film Transistor (TFT) array substrate, and the liquid crystal display panel 110 can further include a liquid crystal layer (not And another substrate (not shown). The other substrate is, for example, a color filter (CF) substrate, which is disposed relative to the substrate 111. At this time, the liquid crystal layer is formed on the TFT array substrate. Between (substrate 111) and the CF substrate. However, in some embodiments, the color filter and the thin film transistor array may also be disposed on the same substrate (ie, C〇l〇r Filter on Array > COA) ° as shown in FIG. The data line 113 and the gate line 1 i 4 of the display panel 11 are arranged alternately on the substrate 111. The pixels 112 are arranged in a matrix on the substrate 111 and are located between the data line 113 and the gate line Π4. The data driving circuit 115 is lightly connected to one side of the data line 113, and is provided with a data driving IC (not shown) for driving the data line 113, and the gate driving circuit 116 is lightly connected to the gate line m of 201133442. - Side 'and a gate drive IC (not shown) for driving the interpole line 114. The signal control _ 117 is electrically connected to the data driving circuit ι 5 and the gate driving circuit U6 for controlling the data driving circuit 115 and the gate driving circuit 116. The signal controller 117 can provide the data control signal c〇NTi and the processed image data signal DAT to the data driving circuit 115, and provide the gate control signal CONT2 to the gate driving circuit i!6. The data control signal c〇ntι may include, for example, a horizontal start signal (STH), a load signal (L〇ad), a data clock signal (CLK), and a polarity 彳§ number (p〇L). The gate control signal c 〇 NT2 may include, for example, a gate clock signal (CPV), a scan enable signal (STV), and an output enable signal (〇E). Referring to Fig. 2, λ shows the intent of the pixel of the liquid crystal display panel according to the first embodiment of the present invention. Each of the pixels 112 of the embodiment may include a driving transistor 112a, a storage capacitor U2b, and a liquid crystal unit U2c. The gate of the driving transistor u2a is electrically connected to the gate line 114, and the source of the driving transistor 112a is electrically connected. Ίί connected to > the feed line 113, the drain of the driving transistor ii2a is electrically connected to one end of the storage capacitor 112b, the other end of the storage capacitor 112b is coupled to the common voltage Vcom, and one end of the liquid crystal unit 112C is electrically connected. The other end of the liquid crystal cell 112c connected to the storage capacitor 112b' is electrically connected to the common voltage ycom. Referring to FIG. 2 and FIG. 3, FIG. 3 shows the voltage converter and the afterimage improving circuit according to the first embodiment of the present invention. Block diagram. The voltage converter 130 of the present embodiment may include a positive charge pUmp i3i and a negative charge pump 132. When the liquid crystal display device of the present embodiment is in the power-on mode, the power supply of the liquid crystal display device 100 can be supplied to the voltage converter 130. At this time, the voltage converter 130 can provide the operating voltage vDDA to the gate of the liquid crystal display panel 110. The driving circuit 116, the operating voltage VDDA includes a high potential voltage (VdD) and a low potential voltage (Vee) 'this rfj potential voltage Vdd is preferably a positive voltage' and can be boosted to a gate drive by the boosting unit 131 Turn-on voltage 201133442 vGH 'This low-potential voltage Vee is preferably a negative voltage, and can be stepped down to a gate drive-off voltage VGL by the buck unit 132. When the data driving circuit 115 supplies the data to the pixel 112, the gate driving circuit 116 can turn on the driving transistor U2a via the gate line 114 at the voltage vGH. After the driving transistor 112a is turned on, the data driving circuit 115 can supply the data to the pixel n2 via the data line 113. After the data is written to the pixel 丨12, at this time, the gate driving circuit 丨16 supplies the voltage 112 to the pixel 112, thereby causing the pixel 112 to be in a closed state. The pixel 112 can store the data signal in the storage capacitor 112b, so that the liquid crystal cell 112c can be continuously displayed until the next data has not been written (i.e., the driving transistor 112a is turned on again). However, when the liquid crystal display device 10 is turned into the shutdown mode, if the data signal (charge) is still maintained in the storage capacitor 112b and is not released, the problem of image sticking is liable to occur.
如圖3所示，本實施例的殘影改善電路140包括電壓偵測 電路141和二端元件142。電壓偵測電路141例如為低壓偵測 積體電路（Low V()ltage detecti〇n IC)，用以侧液晶顯示裝置 7疋否為關機。在本實施例中’電壓^貞測電路141可债測邏 輯操作電壓Vcc或其他系統電壓是否低於一預設值（此預設值 可依實際設計需求來決定之）’以判斷液晶顯示裝置刚是否關 ，。當所述邏輯操作電壓Vee低於此預設值時，亦即偵測到液 =顯不裝置100為關機時，電壓偵測電路141可發出一控制信 號(XAO)至閘極驅動電路116，藉以使閘極驅動電路116依據問 極驅動開啟電壓VGH來開啟所有像素112的驅動電晶體， 以釋放出儲存電容112b所儲存的影像電荷至資料線113,因而 可達到消除液晶顯示裝置⑽之關機殘影的效果。 請參照圖3和圖4,圖4顯示依照本發明之第—實施 殘影改善電路之二端元件的示意圖。本實施例之殘影改善 7 201133442 的一端疋件】42係電性連接於電屢轉換器i3〇所提供的操 作電壓VDDA與閉極驅動開啟電屢Vgh之間，用以在液晶顯示 裝置loo Μ時維持閘極驅動開啟電屋Vgh的準位，避 VGH在進人關機模式時放電過快，而無法順利開啟驅動電晶體 仙的情形。此二端元件142較佳為具有單向導通的特性的元 件，例如二極體。二端元件142的第一端點係輕接於電屋轉換 器㈣的高電位端點（Vdd)，二端元件142的第二端點係搞接於 間極驅動電路116㈣極高電位端點（亦即閉極驅動開啟電屋 vGH)。舉例來說明，此二端元件142可例如為蕭基(sc— 一極體’當液晶顯示裝置100為開機模式時，亦即當電麼轉換 器130正常供電時，由於電壓Vgh大於操作電壓v舰的電壓： 因而二端元件142為逆向偏麼’而不作動。當液晶顯示裝置刚 為關機模式時’亦即當電壓轉換器13〇不供電時，間極驅動開 啟電M vGH開始快速放電，因而電壓Vgh小於操作電壓 的電屢。此時，二端元件142為順向偏遷，因而電壓轉換器i3〇 的操作電麼v職可被提供至閘極驅動電路116的閉極高電位 端，藉以使電壓VGH可箝位（維持）在高電位的操作電壓ν_。 因此，當液晶顯示裝置100關機時，閘極驅動開啟電壓 的準位可被維持-預設時間’藉以順利開啟所有像素ιΐ2的驅 動電晶體112a來釋放出電荷，達到消除液晶顯示裝置1〇〇之關 機殘影的效果。 凊參照圖5A和圖5B，圖5A顯示傳統液晶顯示器在關機 時之操作電壓與閘極驅動開啟電壓的波形圖，@ 5B顯示依照 本發明之第一實施例之液晶顯示裝置在關機時之操作電壓與 閉極驅動開啟電壓的波形圖。其中，在圖5A和圖5B中所標記 的丁。打表示為液晶顯示器的關機時序，如圖5A所示，當傳統 201133442 .液晶顯示器關機時，閘極驅動開啟電壓Vgh會迅速放電至〇v， 、因而無法順利開啟電晶體來消除關機殘影。反之，如圖5B所 不，當本實施例的液晶顯示裝置100關機時，閘極驅動開啟電 壓VGH的準位可被經由二端元件142所導通的操作電壓 來維持住，以避免電壓Vgh放電過快而無法開啟電晶體 的問題’因而本實施例的殘影改善電路140可大幅地改善液晶 顯示裝置100在關機時可能發生的殘影問題。 aa ^值得注意的是，當本實施例的液晶顯示裝置100關機時， _右閘極驅動開啟電壓VGH的放電速度愈慢，則消除關機殘影的 效果可愈好。因此，相較於其他電壓，電壓轉換器130所提供 的操作電壓VDDA可維持住閘極驅動開啟電壓Vgh的準位較長 的時間，而可得到較佳的消除關機殘影效果。以共同電壓 為例，由於電壓轉換器13〇所提供的操作電壓Vdda大於共同 電壓Vcom，且操作電壓Vdda與整個系統輸入電壓具有相同的 路徑，而具有較大的電阻電容值（尺(：值），因此，相較於共同電 壓VC0m，本實施例之電壓轉換器13〇所提供的操作電壓 • 可維持住閘極驅動開啟電壓Vgh的準位一較長的時間，以確保 液晶顯示面板no内的所有閘極線114皆可被順利開啟來中和 像素112内所殘留的電荷，因而可具有較佳的消除關機殘影效 果。 在本實施例中，液晶顯示面板11〇的信號控制器117、電 .壓轉換器130及殘影改善電路140可設置於一控制板（未繪示） 上此控制板例如為印刷電路板（Printed circuit board，PCB)或 軟性印刷電路板（Flexibie printed circuits，FPC)。 在另一實施例中，殘影改善電路14〇亦可設置於基板ηι 上，此時，閘極驅動電路116可利用GIp(Gate_In_panel)技術， 201133442 或稱gale-less技術，來直接形成於基板ηι上。 請參照圖6，其顯示依照本發明之又一實施例之殘影改善. 電路内建於閘極驅動電路中的方塊示意圖。在又一實施例中，： 殘影改善電路240可整合於單一晶片中’例如直接内建於閑極· 驅動電路216中。 ★請參照圖7,其顯示依照本發明之改善關機殘影方法的方 法流程圖。當進行本實施例之改善關機殘影的方法時，首先， 利用殘影改善電路140的電壓偵測電路141來偵測液晶顯示裝 置100是否關機（步驟S301p接著，當電壓偵測電路141偵測 到液晶顯示裝f 100 4關機時，t壓债測電路141可發出控制 信號（XAO)至閘極驅動電路116，藉以使閘極驅動電路n^據 閘極驅動開啟電壓^來開啟所有像t 112的驅動電晶體 112a’且電壓轉換器可提供操作電壓VddaJL閘極驅動電路ιΐ6 的閘極高電位端點VGH(步驟S302)，藉以維持閘極驅動開啟電 壓vGH的準位一預設時間，因而可確保液晶顯示面板ιι〇之所 有像素112的驅動電晶體i 12a被開啟，而達到消除關機殘影的 效果。 請參照圓8’其顯示依照本發明之第二實施例之電壓轉換_ 器與殘影改善電路的方塊示意圖。相較於第一實施例，第二實 施例之殘影改善電路440包括電壓偵測電路441和三端元件 442。電壓_電路441可_液晶顯示裝£刚是否關機， 當電㈣測電路441摘測到液晶顯示裝置1〇〇關機時，電壓该 測電路441可發出控制信號（ΧΑ〇)至閘極驅動電路ιΐ6，來消 除液晶顯示裝置100的關機殘影。三端元件442係電性連接於 電歷轉換器U0所提供的操作電壓與閘極_開啟㈣ VGH之間，此三端元件442例如為電晶體，三端元件442的第 201133442 -端點係耦接於電壓轉換器130的高電位端點(Vdd)，三端元件 442的第二端點_接㈣極職電路ιΐ6㈣As shown in FIG. 3, the afterimage improving circuit 140 of the present embodiment includes a voltage detecting circuit 141 and a two-terminal element 142. The voltage detecting circuit 141 is, for example, a low voltage detecting integrated circuit (Low V() ltage detecti〇n IC), and is used for the side liquid crystal display device 7 to be turned off. In this embodiment, the 'voltage measurement circuit 141 can determine whether the logic operation voltage Vcc or other system voltage is lower than a preset value (this preset value can be determined according to actual design requirements) to determine the liquid crystal display device. Just closed,. When the logic operating voltage Vee is lower than the preset value, that is, when the liquid is detected, the voltage detecting circuit 141 can send a control signal (XAO) to the gate driving circuit 116. Therefore, the gate driving circuit 116 turns on the driving transistor of all the pixels 112 according to the gate driving voltage VGH to release the image charge stored in the storage capacitor 112b to the data line 113, thereby eliminating the shutdown of the liquid crystal display device (10). The effect of afterimage. Referring to Figures 3 and 4, there is shown a schematic diagram of the two-terminal components of the image-improving circuit of the first embodiment of the present invention. The image of the image is improved in the embodiment of the present invention. The 42-series is electrically connected to the operating voltage VDDA and the closed-circuit driving-on voltage Vgh provided by the electrical converter i3〇 for use in the liquid crystal display device loo. When the 闸 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持 维持The two-terminal component 142 is preferably a component having a unidirectional conduction characteristic, such as a diode. The first end of the two-terminal element 142 is lightly connected to the high potential end (Vdd) of the electric house converter (4), and the second end of the two-terminal element 142 is connected to the very high potential end of the interpole driving circuit 116 (four) (That is, the closed-circuit drive opens the electric house vGH). For example, the two-terminal component 142 can be, for example, a Schottky (sc-polar body) when the liquid crystal display device 100 is in the power-on mode, that is, when the converter 130 is normally powered, since the voltage Vgh is greater than the operating voltage v. The voltage of the ship: Therefore, the two-terminal element 142 is reverse-biased' without actuation. When the liquid crystal display device is just in the shutdown mode, that is, when the voltage converter 13 is not powered, the inter-pole drive turns on the power M vGH starts to discharge quickly. Therefore, the voltage Vgh is smaller than the operating voltage. At this time, the two-terminal element 142 is forward biased, and thus the operating voltage of the voltage converter i3〇 can be supplied to the closed-pole high potential of the gate driving circuit 116. Therefore, the voltage VGH can be clamped (maintained) at a high potential operating voltage ν_. Therefore, when the liquid crystal display device 100 is turned off, the level of the gate driving turn-on voltage can be maintained - the preset time 'to smoothly turn on all The driving transistor 112a of the pixel ΐ2 discharges the electric charge to achieve the effect of eliminating the shutdown image of the liquid crystal display device 1. Referring to FIG. 5A and FIG. 5B, FIG. 5A shows that the conventional liquid crystal display is turned off. Waveform diagram of voltage and gate drive turn-on voltage, @5B shows a waveform diagram of the operating voltage and the closed-circuit drive turn-on voltage of the liquid crystal display device according to the first embodiment of the present invention at the time of shutdown, wherein, in FIG. 5A and FIG. The mark marked in 5B is indicated as the shutdown timing of the liquid crystal display. As shown in Fig. 5A, when the conventional 201133442 liquid crystal display is turned off, the gate drive turn-on voltage Vgh is quickly discharged to 〇v, and thus cannot be smoothly turned on. The crystal is used to eliminate the shutdown image. Conversely, as shown in FIG. 5B, when the liquid crystal display device 100 of the embodiment is turned off, the level of the gate driving turn-on voltage VGH can be maintained by the operating voltage that is turned on by the two-terminal element 142. Live to avoid the problem that the voltage Vgh is discharged too fast to turn on the transistor. Thus, the afterimage improving circuit 140 of the present embodiment can greatly improve the image sticking problem that may occur when the liquid crystal display device 100 is turned off. aa ^Notable When the liquid crystal display device 100 of the embodiment is turned off, the slower the discharge speed of the right gate drive turn-on voltage VGH, the effect of turning off the afterimage is eliminated. Therefore, compared with other voltages, the operating voltage VDDA provided by the voltage converter 130 can maintain the level of the gate driving turn-on voltage Vgh for a longer period of time, and a better effect of eliminating the afterimage of the shutdown can be obtained. Taking the common voltage as an example, since the operating voltage Vdda provided by the voltage converter 13A is larger than the common voltage Vcom, and the operating voltage Vdda has the same path as the entire system input voltage, and has a large resistance and capacitance value (foot (: value) Therefore, compared with the common voltage VC0m, the operating voltage provided by the voltage converter 13A of the present embodiment can maintain the level of the gate driving turn-on voltage Vgh for a longer period of time to ensure the inside of the liquid crystal display panel no. All of the gate lines 114 can be smoothly turned on to neutralize the residual charge in the pixel 112, and thus can have a better effect of eliminating the shutdown image. In this embodiment, the signal controller 117, the voltage converter 130 and the afterimage improving circuit 140 of the liquid crystal display panel 11 can be disposed on a control board (not shown), such as a printed circuit board ( Printed circuit board (PCB) or Flexibie printed circuits (FPC). In another embodiment, the afterimage improving circuit 14 can also be disposed on the substrate ηι. At this time, the gate driving circuit 116 can be directly formed on the substrate by using GIp (Gate_In_panel) technology, 201133442 or gale-less technology. Ηι上. Please refer to FIG. 6, which shows a residual image improvement according to still another embodiment of the present invention. A block diagram of a circuit built into a gate driving circuit. In yet another embodiment, the afterimage enhancement circuit 240 can be integrated into a single wafer 'e.g., directly built into the idler driver circuit 216. Referring to Figure 7, there is shown a flow chart of a method for improving the shutdown afterimage in accordance with the present invention. When the method for improving the afterimage of the image is improved, firstly, the voltage detecting circuit 141 of the image sticking improving circuit 140 is used to detect whether the liquid crystal display device 100 is turned off (step S301p, then, when the voltage detecting circuit 141 detects When the liquid crystal display device f 100 4 is turned off, the t voltage debt detecting circuit 141 can issue a control signal (XAO) to the gate driving circuit 116, so that the gate driving circuit n^ turns on all the pixels according to the gate driving turn-on voltage ^. The driving transistor 112a' of the 112 and the voltage converter can provide the gate high potential terminal VGH of the operating voltage VddaJL gate driving circuit ι6 (step S302), thereby maintaining the level of the gate driving turn-on voltage vGH for a preset time, Therefore, it can be ensured that the driving transistor i 12a of all the pixels 112 of the liquid crystal display panel is turned on, and the effect of eliminating the afterimage of the shutdown is achieved. Referring to the circle 8', the voltage conversion device according to the second embodiment of the present invention is displayed. A block diagram of the afterimage improvement circuit. Compared to the first embodiment, the afterimage improvement circuit 440 of the second embodiment includes a voltage detection circuit 441 and a three-terminal element 442. Voltage_circuit 441 _ Liquid crystal display installed just shut down, when the electric (four) measuring circuit 441 is measured to the liquid crystal display device 1 〇〇 shutdown, the voltage measuring circuit 441 can send a control signal (ΧΑ〇) to the gate driving circuit ιΐ6 to eliminate the liquid crystal The shutdown of the display device 100. The three-terminal component 442 is electrically connected between the operating voltage provided by the electrical calendar converter U0 and the gate-on (four) VGH, such as a transistor, a three-terminal component. No. 201133442 of 442 - the end point is coupled to the high potential end point (Vdd) of the voltage converter 130, and the second end point of the three end element 442 is connected to the (four) pole job circuit ιΐ6 (4)
(亦即閉極驅動開啟電壓VGH)，三端元件⑷的第三端二 以接收-導通控制信號術，此導通控制信號4〇1可利用電麗 僅測電路441的控制信號來經過—反向單元如而轉換形成， 其中反向單元443係電性連接於電壓偵測電路44ι與三端元件 442之間’用以轉換刪測電路441的控制信號成高電壓準 位=導通控制信號4(Π。舉例來說明，此三端元件442可例如 為場效電晶體’其沒極（第-端點）麵接於高電位端點D，其 源極（第二端點）耦接於閘極高電位端點（VGH)，以及其閘極（第三 端點）耦接於反向單元443 »當液晶顯示裝置1〇〇為開機模^ 時’三端元件442為不導通。當液晶顯示裝置1〇〇為關機模式 時，三端元件442的閘極（第三端點）可接收到高準位的導通控 制信號4G卜因而三端元件442形成導通，藉讀供電壓轉換 器130的操作電壓VDDA至閘極驅動電路116的閘極高電位端 (Vgh)。因此，當閘極驅動開啟電壓Vgh的準位可被維持一預設 時間，藉以消除液晶顯示裝置100的關機殘影。 由上述本發明的實施例可知，本發明之顯示裝置的殘影改 善電路及方法可避免液晶顯示裝置關機時的閘極驅動開=電 壓放電過快，而確保所有像素的驅動電晶體可被順利開啟，藉 以改善液晶顯示裝置在關機時可能發生的殘影問題。 综上所述，雖然本發明已用較佳實施例揭露如上，然其並 非用以限定本發明，本發明所屬技術領域中具有通常知識者， 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， 因此本發明之保護範圍當視後附之申請專利範圍所界定者為 11 201133442 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例能更 明顯易懂，所附圖式之詳細說明如下： 圖1顯示依照本發明之第一實施例之液晶顯示裝置的示意 圖。 圖2顯示依照本發明第一實施例之液晶顯示面板之像素的 不意圖。 圖3顯示依照本發明之第一實施例之電壓轉換器與殘影改 善電路的方塊示意圖。 圖4顯示依照本發明之第一實施例之殘影改善電路之二端 元件的示意圖。 圖5A顯示傳統液晶顯示器在關機時之操作電壓與閘極驅 動開啟電壓的波形圖。 圖5B顯示依照本發明之第一實施例之液晶顯示裝置在關 機時之操作電壓與閘極驅動開啟電壓的波形圖。 圖6顯示依照本發明之又一實施例之殘影改善電路内建於 閘極驅動電路中的方塊示意圖。 圖7顯示依照本發明之改善關機殘影方法的方法流程圖。 圖8顯示依照本發明之第二實施例之電壓轉換器 善電路的方塊示意圖。 ' ' 【主要元件符號說明】 11 〇 .液晶顯示面板 112 :像素 112b ;儲存電容 100 :液晶顯示裝置 111 :基板 112a :驅動電晶體 201133442 113 ： 資料線 115 ： 資料驅動 電路 117 : 信號控制 器 130 ： 電壓轉換 器 132 ： 降壓單元 142 : 一端元件 442 ： 三端元件 112c :液晶單元 114 :閘極線 116、216:閘極驅動電路 120 :背光模組 131 :升壓單元 140、 240、440 :殘影改善電路 141、 441 :電壓偵測電路 401 :導通控制信號(ie, the closed-circuit drive turn-on voltage VGH), the third end of the three-terminal component (4) is controlled by a receive-conduction control signal, and the turn-on control signal 4〇1 can be passed through the control signal of the circuit-only circuit 441. The unit is converted into a unit, wherein the inverting unit 443 is electrically connected between the voltage detecting circuit 44i and the three-terminal element 442. The control signal for converting the puncturing circuit 441 is at a high voltage level. By way of example, the three-terminal element 442 can be, for example, a field-effect transistor whose its non-polar (terminal-end) surface is connected to the high potential terminal D, and its source (second terminal) is coupled to The gate high potential terminal (VGH), and its gate (third terminal) are coupled to the reverse unit 443. » When the liquid crystal display device 1 is the boot mode, the three-terminal element 442 is non-conducting. When the liquid crystal display device 1 is in the shutdown mode, the gate (third end) of the three-terminal element 442 can receive the high-level conduction control signal 4G, and thus the three-terminal element 442 is turned on, and the voltage supply converter is read. The operating voltage VDDA of 130 to the gate high potential terminal (Vgh) of the gate driving circuit 116 Therefore, the level of the gate driving turn-on voltage Vgh can be maintained for a predetermined time, thereby eliminating the shutdown image of the liquid crystal display device 100. The image sticking improvement circuit of the display device of the present invention is known from the above embodiments of the present invention. The method can prevent the gate driving of the liquid crystal display device from being turned off and the voltage discharge is too fast, and ensuring that the driving transistor of all the pixels can be smoothly turned on, thereby improving the residual image problem that may occur when the liquid crystal display device is turned off. The present invention has been described in the above preferred embodiments, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the scope of the appended claims. 11 201133442 [Simplified Description of the Drawings] The above and other objects, features, advantages and embodiments of the present invention will become more apparent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a liquid crystal display device according to a first embodiment of the present invention. 2 is a block diagram showing a pixel of a liquid crystal display panel according to a first embodiment of the present invention. Fig. 3 is a block diagram showing a voltage converter and an afterimage improving circuit in accordance with a first embodiment of the present invention. FIG. 5A is a waveform diagram showing an operating voltage and a gate driving turn-on voltage of a conventional liquid crystal display at the time of shutdown. FIG. 5B shows a first embodiment of the present invention. FIG. 6 is a block diagram showing the residual image improving circuit built in the gate driving circuit according to still another embodiment of the present invention. FIG. A flowchart of a method for improving the shutdown image sticking method in accordance with the present invention is shown. Fig. 8 is a block diagram showing a circuit of a voltage converter according to a second embodiment of the present invention. ' ' [Main component symbol description] 11 液晶. Liquid crystal display panel 112: pixel 112b; storage capacitor 100: liquid crystal display device 111: substrate 112a: drive transistor 201133442 113: data line 115: data drive circuit 117: signal controller 130 : Voltage converter 132 : Step-down unit 142 : One end element 442 : Three-terminal element 112c : Liquid crystal unit 114 : Gate line 116 , 216 : Gate drive circuit 120 : Backlight module 131 : Boost unit 140 , 240 , 440 : afterimage improvement circuit 141, 441: voltage detection circuit 401: conduction control signal
443 :反向單元 S301 :偵測顯示裝置是否關機 田顯示裝置為關機時，提供操作電壓至閘極驅動電 路的閘極高電位端點443: Reverse unit S301: Detecting whether the display device is turned off. When the field display device is turned off, the operating voltage is supplied to the gate high potential end of the gate drive circuit.
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