TWI397889B - Liquid crystal display device and method for improving flicker and residual image - Google Patents
Liquid crystal display device and method for improving flicker and residual image Download PDFInfo
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Description
本發明係有關一種液晶顯示裝置與方法，特別是指一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置與方法。The present invention relates to a liquid crystal display device and method, and more particularly to a liquid crystal display device and method having improved image flicker and image sticking.
習知液晶顯示裝置，普遍皆存在影像殘影現象，此殘影現象係因為每個像素的液晶電容內有殘留電荷未釋放所致。特別是液晶顯示器在關機時通常會殘留有電荷於液晶電容內，而導致關機殘影畫面的產生。同時，若是這些電荷無法在下一次啟動液晶顯示器前完全排除，即會使得顯示器重新開啟後，液晶顯示面板會產生短暫的閃爍的現象。此外，若液晶電視之液晶電容的共同電極(Vcom)的偏壓變化而改變共同電壓之準位時，亦會產生閃爍現象。於是，如何排除液晶電容內之殘留電荷，以防止畫面閃爍及關機殘影畫面之現象，對於液晶顯示器之品質提升，確有極為重要的影響。Conventional liquid crystal display devices generally have image sticking phenomenon, which is caused by residual charge in the liquid crystal capacitor of each pixel. In particular, when the liquid crystal display is turned off, there is usually a charge remaining in the liquid crystal capacitor, which results in a shutdown image. At the same time, if these charges cannot be completely removed before the next time the LCD display is turned on, the LCD panel will produce a brief flicker after the display is turned back on. In addition, if the bias voltage of the common electrode (Vcom) of the liquid crystal capacitor of the liquid crystal display changes to the level of the common voltage, flickering also occurs. Therefore, how to eliminate the residual charge in the liquid crystal capacitor to prevent the phenomenon of flickering and turning off the residual image, has an extremely important influence on the quality improvement of the liquid crystal display.
先前技術之台灣專利第I253037號乃提出一種具有畫面閃爍與殘影改善之液晶顯示器，包括一液晶顯示面板、一面板電源供應器、一視訊控制器與一時序控制器，其中液晶顯示面板係具有複數個液晶電容以顯示畫面。面板電源供應器係供應液晶顯示面板所需之電源。視訊控制器係控制輸入液晶顯示面板之畫面內容。時序控制器係分別與視訊控制器及液晶顯示面板相連接，以控制視訊控制器及液晶顯示面板之運作順序。其操作程序如第1圖所示，係在液晶顯示器電源開關關閉後提供一預設畫面至液晶顯示面板，以使液晶電容之殘留電荷快速釋放。The prior art Taiwan Patent No. I253037 proposes a liquid crystal display having screen flicker and image sticking improvement, comprising a liquid crystal display panel, a panel power supply, a video controller and a timing controller, wherein the liquid crystal display panel has A plurality of liquid crystal capacitors are used to display the picture. The panel power supply supplies the power required for the liquid crystal display panel. The video controller controls the content of the screen input to the liquid crystal display panel. The timing controller is respectively connected to the video controller and the liquid crystal display panel to control the operation sequence of the video controller and the liquid crystal display panel. The operation procedure is as shown in FIG. 1 , and a preset screen is provided to the liquid crystal display panel after the power switch of the liquid crystal display is turned off, so that the residual charge of the liquid crystal capacitor is quickly released.
前述之先前技術僅在電源開關關閉後，進行殘留電荷的快速釋放，並無法解決於正常顯示或是待機時之畫面閃爍與關機殘影畫面現象。由於，LCD顯示器在發生殘影時，其通常會出現在一些固定的位置，因此，本發明提出一種將畫面快速位移的方式，使得固定位置上的殘影狀態可以被消除，以解決殘影現象。同時，殘影的發生也與驅動電壓有關，因此，本發明也同時提出一種以變動Vcom電壓來降低驅動電壓的方式，以降低電場對液晶分子的影響，進而解決殘影的問題。The foregoing prior art performs the rapid release of the residual charge only after the power switch is turned off, and cannot solve the phenomenon of flickering and turning off the afterimage of the screen during normal display or standby. Since the LCD display usually appears in some fixed positions when the afterimage occurs, the present invention proposes a method of rapidly shifting the picture so that the afterimage state at the fixed position can be eliminated to solve the image sticking phenomenon. . At the same time, the occurrence of afterimage is also related to the driving voltage. Therefore, the present invention also proposes a method of reducing the driving voltage by varying the Vcom voltage to reduce the influence of the electric field on the liquid crystal molecules, thereby solving the problem of image sticking.
為解決先前技術之問題，本發明提供一種可改善畫面閃爍及畫面殘影之液晶顯示裝置與方法，包括一具有n個像素之液晶面板以及一可控制液晶面板顯示內容之視訊控制器，液晶顯示裝置之視訊控制器係以p＝n－m、p＝n＋m、p＝n(n>>m)個像素來顯示一正常畫面，並由視訊控制器役使正常畫面往復於p及n個像素之間。In order to solve the problems of the prior art, the present invention provides a liquid crystal display device and method for improving image flicker and image sticking, comprising a liquid crystal panel with n pixels and a video controller capable of controlling the display content of the liquid crystal panel, and displaying the liquid crystal display. The video controller of the device displays a normal picture with p=n-m, p=n+m, p=n(n>>m) pixels, and the video controller performs the normal picture reciprocating to p and n pixels. between.
因此，本發明之主要目的在於提供一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，透過在應用端之軟體來克服此問題。Accordingly, it is a primary object of the present invention to provide a liquid crystal display device having improved image flicker and image sticking, which overcomes this problem by software at the application end.
本發明之次要目的在於提供一種具有改善液晶顯示裝置之畫面閃爍及畫面殘影的方法，透過在應用端之軟體來克服此問題。A secondary object of the present invention is to provide a method for improving picture flicker and image sticking of a liquid crystal display device, which overcomes this problem by software on the application side.
本發明之再一目的在於提供一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，其可延長面板壽命。It is still another object of the present invention to provide a liquid crystal display device having improved picture flicker and image sticking which can extend the life of the panel.
本發明之另一目的在於提供一種具有改善液晶顯示裝置之畫面閃爍及畫面殘影的方法，其可延長面板壽命。Another object of the present invention is to provide a method for improving picture flicker and image sticking of a liquid crystal display device, which can extend the life of the panel.
據此，本發明提供一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，包括一具有n個像素之液晶面板以及一可控制液晶面板顯示內容之視訊控制器，液晶顯示裝置之特徵在於視訊控制器係以p＝n－m、p＝n＋m、p＝n(n>>m)個像素來顯示一正常畫面，並由視訊控制器役使正常畫面往復於p及n個像素之間，。Accordingly, the present invention provides a liquid crystal display device having improved image flicker and image sticking, comprising a liquid crystal panel having n pixels and a video controller capable of controlling display contents of the liquid crystal panel, wherein the liquid crystal display device is characterized by video control The device displays a normal picture with p=n-m, p=n+m, p=n(n>>m) pixels, and the normal picture is reciprocated between p and n pixels by the video controller.
接著，本發明再提供一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，包括一具有n個像素之液晶面板以及一可控制液晶面板顯示內容之視訊控制器，液晶顯示裝置之特徵在於視訊控制器係以一大於n個像素或小於n個像素或等於n個像素之p個像素來顯示正常畫面，並由視訊控制器役使正常畫面往復於p及m個像素之間。The present invention further provides a liquid crystal display device having improved image flicker and image sticking, comprising a liquid crystal panel having n pixels and a video controller capable of controlling the display content of the liquid crystal panel. The liquid crystal display device is characterized by video control. The normal picture is displayed with a p pixel larger than n pixels or smaller than n pixels or equal to n pixels, and the normal picture is reciprocated between p and m pixels by the video controller.
再接著，本發明再提供一種具有改善液晶顯示裝置之畫面閃爍及畫面殘影的方法，包括：提供一液晶面板，液晶面板具有n個像素；以及提供一視訊控制器，係與液晶面板連接，用以控制液晶面板以p＝n－m、p＝n＋m、p＝n(n>>m)個像素來顯示一正常畫面；其中視訊控制器係以p個像素來顯示正常畫面，並由視訊控制器役使正常畫面往復於p及n個像素之間。Then, the present invention further provides a method for improving screen flicker and image sticking of a liquid crystal display device, comprising: providing a liquid crystal panel having n pixels; and providing a video controller connected to the liquid crystal panel. It is used to control the liquid crystal panel to display a normal picture with p=n-m, p=n+m, p=n(n>>m) pixels; wherein the video controller displays the normal picture with p pixels, and the video is displayed by the video controller. The controller causes the normal picture to reciprocate between p and n pixels.
本發明又提供一種具有改善液晶顯示裝置之畫面閃爍及畫面殘影的方法，包括：提供一液晶面板，液晶面板具有n個像素；以及提供一視訊控制器，係與液晶面板連接，用以控制液晶面板以一大於n個像素或小於n個像素或等於n個像素之p個像素來顯示正常畫面；其中視訊控制器役使正常畫面往復於m個像素之間。The present invention further provides a method for improving picture flicker and image sticking of a liquid crystal display device, comprising: providing a liquid crystal panel having n pixels; and providing a video controller connected to the liquid crystal panel for controlling The liquid crystal panel displays a normal picture with p pixels larger than n pixels or smaller than n pixels or equal to n pixels; wherein the video controller causes the normal picture to reciprocate between m pixels.
本發明又提供一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，包括一具有MVA結構之液晶面板、一提供液晶面板之背光模組以及一可控制液晶面板顯示內容之視訊控制器，液晶顯示裝置之特徵在於當提供MVA結構之液晶面板之背光模組關閉時，即由視訊控制器送出一即設之黑色畫面至液晶面板。The invention further provides a liquid crystal display device with improved image flicker and residual image, comprising a liquid crystal panel with an MVA structure, a backlight module providing a liquid crystal panel, and a video controller capable of controlling the display content of the liquid crystal panel, the liquid crystal display The device is characterized in that when the backlight module of the liquid crystal panel providing the MVA structure is turned off, a black screen to the liquid crystal panel is sent by the video controller.
本發明又提供一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，包括一具有TN型之液晶面板、一提供液晶面板之背光模組以及一可控制液晶面板顯示內容之視訊控制器，液晶顯示裝置之特徵在於當提供TN型之液晶面板之背光模組關閉時，即由視訊控制器送出一即設之白色畫面至TN型之液晶面板。The invention further provides a liquid crystal display device with improved screen flicker and residual image, comprising a TN-type liquid crystal panel, a backlight module providing a liquid crystal panel, and a video controller capable of controlling the display content of the liquid crystal panel, the liquid crystal display The device is characterized in that when the backlight module of the TN type liquid crystal panel is turned off, a white screen to a TN type liquid crystal panel is sent by the video controller.
本發明提供一種具有改善廣告箱系統之畫面閃爍及畫面殘影的方法，其中該廣告箱系統包括一視訊控制器、一顯示面板、一背光源及一顯示面板電源，此方法包括：執行廣告箱系統之開機程序，以完成開機；然後視訊控制器將所要播放的廣告內容傳遞給該液晶面板，以顯示廣告畫面；接著執行一休眠程序，由視訊控制器關閉背光源；由視訊控制器停止廣告畫面之信號；接著提供一個預定畫面信號，係由視訊控制器以一預定畫面顯示於液晶面板；最後關閉液晶面板電源，以完成廣告箱系統之休眠程序。The present invention provides a method for improving screen flicker and image sticking of an advertising box system, wherein the advertising box system includes a video controller, a display panel, a backlight, and a display panel power supply. The method includes: executing an advertising box The booting process of the system is completed to complete the booting; then the video controller transmits the advertisement content to be played to the liquid crystal panel to display the advertisement screen; then a sleep program is executed, the backlight is turned off by the video controller; the advertisement is stopped by the video controller The signal of the picture is followed by providing a predetermined picture signal, which is displayed on the liquid crystal panel by the video controller in a predetermined screen; finally, the power of the liquid crystal panel is turned off to complete the sleep program of the advertising box system.
一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，包括一具有n個像素之液晶面板，其中液晶面板中的每一像素係至少由一TFT裝置及液晶電容所形成，其中液晶顯示裝置之特徵在於：藉由TFT控制施於液晶兩端的偏壓，來達到顯示的效果，而殘影的產生正是電荷累積的結果，因此降低電荷的大小便可改善殘影現象。所以本設計將共同電壓(Vcom)改成變動形式，來降低液晶的兩端偏壓。A liquid crystal display device with improved image flicker and image sticking, comprising a liquid crystal panel having n pixels, wherein each pixel in the liquid crystal panel is formed by at least a TFT device and a liquid crystal capacitor, wherein the characteristics of the liquid crystal display device The TFT is controlled by the bias voltage applied to both ends of the liquid crystal to achieve the display effect, and the generation of residual image is the result of charge accumulation, so reducing the charge size can improve the image sticking phenomenon. Therefore, this design changes the common voltage (Vcom) to a variable form to reduce the bias voltage at both ends of the liquid crystal.
由於本發明係揭露一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，其中所利用到的液晶顯示器之畫面導通與訊號處理之原理，已於先前技術中詳細揭露，故在以下說明中，對於顯示器電性導通方式與訊號處理之傳遞，不作完整描述。而且以下內文中之圖式，亦並未依據實際之相關尺寸完整繪製，其作用僅在表達與本發明特徵有關之示意圖。The present invention discloses a liquid crystal display device having improved image flicker and image sticking, wherein the principle of picture conduction and signal processing of the liquid crystal display used has been disclosed in detail in the prior art, and therefore, in the following description, The electrical conduction mode of the display and the transmission of the signal processing are not fully described. Moreover, the drawings in the following texts are not completely drawn in accordance with actual relevant dimensions, and their functions are only to show schematic diagrams relating to the features of the present invention.
首先，請參考第二圖，係本發明之具有改善畫面閃爍及畫面殘影之液晶面板示意圖，其中在本實施例中之液晶顯示裝置1，包括一具有n個像素之液晶面板2以及一可控制液晶面板2顯示內容之視訊控制器(未顯示於圖中)。液晶顯示裝置1之視訊控制器係以p＝n－m、p＝n＋m、p＝n(其中n>>m)個像素來顯示一正常畫面。同時，利用視訊控制器役使正常畫面往復於p及n個像素之間，例如：以5分鐘移動1 pixel來使人眼察覺不出變動。The liquid crystal display device 1 of the present invention includes a liquid crystal panel 2 having n pixels and a liquid crystal panel. A video controller (not shown) that controls the display of the content of the liquid crystal panel 2. The video controller of the liquid crystal display device 1 displays a normal picture with p=n-m, p=n+m, p=n (where n>>m) pixels. At the same time, the video controller is used to make the normal picture reciprocate between p and n pixels, for example, moving 1 pixel in 5 minutes to make the human eye feel no change.
以一實施例來說明，當一個液晶顯示裝置1中的液晶面板2具有300萬(n)像素(pixels)，而本發明之視訊控制器係以一小於n個像素之p個像素(即p＝n－m)290萬象素來顯示正常畫面，其中未使用的10萬(m)像素係分佈在液晶面板2的週邊區域，例如：在液晶面板2之右上角處，因此，當本發明之液晶顯示裝置1在顯示一個畫面的過程中，每次都是以290萬像素來顯示一個正常之畫面，並且會由視訊控制器役使所要顯示的畫面往復於p(290萬)及n(300萬)個畫素之間，也就是說，顯示的畫面沿著右上角的方向往復顯示，如第二圖之箭頭所示方向。此外，為了使觀看者辨識不出顯示畫面的往復動作，所以其往復之頻率可以選擇大於30HZ或是選擇以每X分鐘(X>2)移動1 pixel的方式來使人眼察覺不出變動。In one embodiment, when the liquid crystal panel 2 in a liquid crystal display device 1 has 3 million (n) pixels, the video controller of the present invention has a p pixel smaller than n pixels (ie, p =n-m) 2.9 million pixels to display a normal picture, wherein unused 100,000 (m) pixels are distributed in the peripheral area of the liquid crystal panel 2, for example, at the upper right corner of the liquid crystal panel 2, therefore, when the liquid crystal of the present invention In the process of displaying one screen, the display device 1 displays a normal picture with 2.9 million pixels each time, and the screen to be displayed by the video controller is reciprocated to p (2.9 million) and n (3 million). Between the pixels, that is, the displayed picture is displayed back and forth along the direction of the upper right corner, as indicated by the arrow in the second figure. In addition, in order to prevent the viewer from recognizing the reciprocating motion of the display screen, the frequency of the reciprocation can be selected to be greater than 30 Hz or the manner of moving 1 pixel every X minutes (X>2) to prevent the human eye from detecting the change.
藉由此特定方向的往復來產生畫面的位移，可使得固定位置上的殘影被遮蔽，以解決液晶顯示裝置畫面閃爍及畫面殘影之問題。另外要強調的是，未使用的像素m並不限定是分佈在液晶面板2右上角的週邊區域，其可以是其他的週邊區域，例如左下角、右下角、中間、液晶面板2右邊或左邊的區域等，本發明並不加以限制。By the reciprocation of the specific direction to generate the displacement of the screen, the residual image at the fixed position can be shielded to solve the problem of the screen flicker and the image sticking of the liquid crystal display device. In addition, it should be emphasized that the unused pixels m are not limited to the peripheral regions distributed in the upper right corner of the liquid crystal panel 2, and may be other peripheral regions, such as the lower left corner, the lower right corner, the middle, the right or left side of the liquid crystal panel 2. The area and the like are not limited by the present invention.
上述實施例中，液晶顯示裝置1進一步包括一液晶面板2之電源供應器4，以提供液晶面板之電源需求。In the above embodiment, the liquid crystal display device 1 further includes a power supply 4 of the liquid crystal panel 2 to provide power requirements of the liquid crystal panel.
請再參考第三圖，係本發明具有改善液晶顯示裝置之畫面閃爍及畫面殘影之另一較佳實施例。液晶顯示裝置1包括一具有n個像素之液晶面板2以及一個可控制液晶面板2顯示內容之視訊控制器，其中，液晶面板2係與第一實施例相同，但視訊控制器係以一大於n個像素之p個像素(即p＝n＋m)來顯示正常畫面，並由視訊控制器役使正常畫面往復於p及n個像素之間，其中往復頻率大於人類眼睛之暫停視覺。例如，往復頻率可以選擇大於30HZ，即可使得人可感受到連續的顯示畫面，而不產生閃爍之視覺現象，或是選擇以每X分鐘(X>2)移動1 pixel的方式來使人眼察覺不出變動。因此，當本發明之液晶顯示裝置1在顯示一個畫面的過程中，每次都是以310(p)萬像素來顯示一個正常之畫面，並且會由視訊控制器役使所要顯示的畫面以310萬像素往復以300萬(n)至310萬各畫素顯示於液晶面板2上。在一較佳實施例中，顯示的畫面沿著右上角的方向往復顯示，如第三圖之箭頭所示方向。藉由此特定方向的往復來產生畫面的位移，同樣可有效地消除固定位置上的殘影，以解決液晶顯示裝置畫面閃爍及畫面殘影之問題。另外要強調的是，在本實施例中的往復方向，本發明並不加以限制，其可以是例如往左下角、右下角、中間、或是液晶面板2右邊或左邊的區域等。Referring to the third figure, the present invention has another preferred embodiment for improving the picture flicker and the image sticking of the liquid crystal display device. The liquid crystal display device 1 includes a liquid crystal panel 2 having n pixels and a video controller capable of controlling the display content of the liquid crystal panel 2. The liquid crystal panel 2 is the same as the first embodiment, but the video controller is greater than n. The p pixels of the pixels (ie, p=n+m) are used to display the normal picture, and the video controller causes the normal picture to reciprocate between p and n pixels, wherein the reciprocating frequency is greater than the pause vision of the human eye. For example, the reciprocating frequency can be selected to be greater than 30 Hz, so that a person can feel a continuous display without generating a blinking visual phenomenon, or choose to move the human eye by moving 1 pixel every X minutes (X>2). I can't detect the change. Therefore, when the liquid crystal display device 1 of the present invention displays a picture in a process of displaying a normal picture at 310 (p) megapixels each time, the video controller is required to display the picture to be displayed at 3.1 million. The pixels are reciprocated on the liquid crystal panel 2 at 3 million (n) to 3.1 million pixels. In a preferred embodiment, the displayed picture is displayed back and forth along the direction of the upper right hand, as indicated by the arrows in the third figure. By the reciprocation of the specific direction to generate the displacement of the picture, the residual image at the fixed position can also be effectively eliminated, thereby solving the problem of the screen flicker and the image sticking of the liquid crystal display device. It is to be noted that the reciprocating direction in the present embodiment is not limited in the present invention, and may be, for example, a lower left corner, a lower right corner, a middle, or an area to the right or left of the liquid crystal panel 2.
接著，請參考第四圖，係本發明之一種改善液晶顯示器畫面閃爍與畫面殘影的方式流程圖。如第四圖所示，本發明之改善液晶顯示裝置1之畫面閃爍及畫面殘影的方法，包括以下步驟：(1)提供一液晶面板，液晶面板2具有n個像素，如步驟10所示；(2)提供一視訊控制器，係與液晶面板2連接，用以控制液晶面板2以n－m(n>>m)個像素來顯示一正常畫面，其中m個未使用到的像素係分佈於液晶面板2之週邊區域，如步驟20所示；(3)由視訊控制器役使正常畫面往復於n－m個像素與n個像素之間，藉由此特定方向的往復來產生畫面的位移，可有效地遮蔽固定位置上的殘影，其中往復頻率可以選擇要大於30HZ秒或是選擇以每X分鐘(X>2)移動1 pixel的方式來使人眼察覺不出變動，如步驟30所示。Next, please refer to the fourth figure, which is a flow chart of a method for improving the screen flicker and the image sticking of the liquid crystal display. As shown in the fourth figure, the method for improving the screen flicker and the image sticking of the liquid crystal display device 1 includes the following steps: (1) providing a liquid crystal panel, the liquid crystal panel 2 having n pixels, as shown in step 10. (2) providing a video controller connected to the liquid crystal panel 2 for controlling the liquid crystal panel 2 to display a normal picture with n-m(n>>m) pixels, wherein m unused pixels are used. Distributed in the peripheral area of the liquid crystal panel 2, as shown in step 20; (3) by the video controller to make the normal picture reciprocate between n-m pixels and n pixels, thereby generating a picture by reciprocating in a specific direction The displacement can effectively block the afterimage at the fixed position, wherein the reciprocating frequency can be selected to be greater than 30 Hz seconds or the method of moving 1 pixel every X minutes (X>2) to make the human eye detect no change, such as steps 30 is shown.
請繼續參考第四圖，本發明揭露另一種改善液晶顯示器下次開機畫面閃爍與畫面殘影的方式，包括以下步驟：(1)提供一液晶面板，液晶面板具有n個像素，如步驟10所示；(2)提供一視訊控制器，係與液晶面板2連接，用以控制液晶面板2以一大於n個像素之p個像素來顯示正常畫面，如步驟20所示；(3)由視訊控制器役使正常畫面往復於p個像素之間，藉由此特定方向的往復來產生畫面的位移，以遮蔽固定位置上的殘影，其中往復頻率可以選擇要大於30HZ秒或是選擇以每X分鐘(X>2)移動1 pixel的方式來使人眼察覺不出變動。，而不產生閃爍之視覺現象，如步驟30所示。Please refer to the fourth figure. The present invention discloses another method for improving the next startup screen flicker and image sticking of the liquid crystal display, including the following steps: (1) providing a liquid crystal panel having n pixels, as shown in step 10 (2) providing a video controller connected to the liquid crystal panel 2 for controlling the liquid crystal panel 2 to display a normal picture with p pixels larger than n pixels, as shown in step 20; (3) by video The controller causes the normal picture to reciprocate between p pixels, thereby generating a displacement of the picture by reciprocating in a specific direction to shield the residual image at a fixed position, wherein the reciprocating frequency can be selected to be greater than 30 Hz seconds or selected to be per X Minutes (X>2) move 1 pixel to make the human eye notice no change. Without causing a blinking visual phenomenon, as shown in step 30.
接著請參考第五圖，係本發明之另一種具有改善畫面閃爍及畫面殘影的步驟，其中液晶顯示裝置1包括一個液晶面板2、一個提供液晶面板2之背光模組5以及一個可控制液晶面板2顯示內容之個視訊控制器。當液晶顯示裝置1完成開機程序後，如步驟210所示；並在正常畫面顯示一段時間後，如步驟220所示；接著，當液晶顯示裝置1欲進入休眠狀態時，即只關閉液晶面板2而不關機；液晶顯示裝置1中的視訊控制器會先將液晶面板2中的背光模組5關閉，如步驟230所示；然後視訊控制器會停止正常畫面的顯示，如步驟240所示；隨即再由視訊控制器送出一黑色畫面至液晶面板2，如步驟250所示，最後再由視訊控制器關閉液晶面板2之電源以完成休眠之程序，如步驟260。故在本實施例中，不但可避免關閉液晶面板2時產生畫面閃爍及畫面殘影的現象外，當休眠一段時間後，在下次需要重啟液晶面板2螢幕時，可快速開啟(因為不需重新啟動液晶顯示裝置1)。Referring to the fifth figure, another step of the present invention is to improve the screen flicker and the image sticking. The liquid crystal display device 1 includes a liquid crystal panel 2, a backlight module 5 for providing the liquid crystal panel 2, and a controllable liquid crystal. Panel 2 displays a video controller for the content. After the liquid crystal display device 1 completes the booting process, as shown in step 210; and after displaying the normal screen for a period of time, as shown in step 220; then, when the liquid crystal display device 1 wants to enter the sleep state, only the liquid crystal panel 2 is turned off. The video controller in the liquid crystal display device 1 first turns off the backlight module 5 in the liquid crystal panel 2, as shown in step 230; then the video controller stops the display of the normal screen, as shown in step 240; Then, a black screen is sent from the video controller to the liquid crystal panel 2, as shown in step 250, and finally the video controller turns off the power of the liquid crystal panel 2 to complete the sleep process, as in step 260. Therefore, in this embodiment, not only the phenomenon of flickering and residual image of the screen when the liquid crystal panel 2 is turned off can be avoided, and after a period of sleep, the next time the screen of the liquid crystal panel 2 needs to be restarted, it can be quickly turned on (because no need to restart The liquid crystal display device 1) is activated.
如上所述，當本發明之液晶顯示裝置1之液晶面板2為一個TN型之液晶面板時，其休眠程序相同，只是在步驟250所提供之預定畫面為白色。As described above, when the liquid crystal panel 2 of the liquid crystal display device 1 of the present invention is a TN type liquid crystal panel, the sleep program is the same, except that the predetermined screen provided at the step 250 is white.
以一廣告箱的實施例來說明，請繼續參考第五圖所示的步驟：(1)首先，完成系統開機之程序，如步驟210所示。(2)接著，由視訊控制器將所要播放的廣告內容傳遞給液晶面板，以顯示廣告畫面，如步驟220所示；(3)當進行廣告內容更換或是暫停廣告播放時，即由視訊控制器先關閉背光源之電源，如步驟230所示；(4)然後，由視訊控制器停止廣告畫面之信號，如步驟240所示；(5)再由視訊控制器提供一個預定畫面信號，以此預定畫面蓋住畫面閃爍或畫面殘影之畫面，以舒緩此問題。特別要強調的是，當廣告看板中的液晶面板為一種MVA結構時，提供一預定的黑畫面；當廣告看板中的液晶面板為一種TN型之液晶面板時，提供一預定的白畫面。(6)最後，再由視訊控制器關閉面板電源，以完成休眠之程序如步驟260所示。In the embodiment of an advertisement box, please continue to refer to the steps shown in the fifth figure: (1) First, complete the system startup procedure, as shown in step 210. (2) Next, the video controller transmits the advertisement content to be played to the LCD panel to display the advertisement screen, as shown in step 220; (3) when the advertisement content is replaced or the advertisement is paused, the video control is performed. The device first turns off the power of the backlight, as shown in step 230; (4) then, the video controller stops the signal of the advertisement screen, as shown in step 240; (5) the video controller provides a predetermined picture signal to This predetermined screen covers the screen flickering or the image afterimage to soothe the problem. It is particularly emphasized that when the liquid crystal panel in the advertisement billboard is an MVA structure, a predetermined black screen is provided; when the liquid crystal panel in the advertisement billboard is a TN type liquid crystal panel, a predetermined white screen is provided. (6) Finally, the program for turning off the panel power by the video controller to complete the hibernation is as shown in step 260.
最後，本發明進一步揭露一種具有改善畫面閃爍及畫面殘影之液晶顯示裝置，而液晶顯示裝置包括一具有n個像素之液晶面板，其中液晶面板中的每一像素係至少由一TFT裝置及液晶電容所形成。請參照第6a圖及第6b圖，在本實施例中，係將液晶面板中形成像素的液晶電容之共同電壓(Vcom)由直流偏壓(DC bias)的驅動方式，如第6a圖(一種先前技術)所示，改變成以交流偏壓(AC bias)來驅動，如第6b圖所示。因此，可藉由調整交流偏壓的位準，例如將V－com電壓改變成一具有一特定電壓位準，例如正負2伏特時，則此時，驅動液晶電容之電壓可以降低至正負8伏特就可驅動。因此，可將原本需由10V的直流電壓才能驅動的共同電壓降低至8V就可驅動，藉由此降低驅動電壓而達到降低電場對液晶分子的影響，故可減低畫面殘影現象，並且不影響原本液晶顯示裝置1之顯示表現。很明顯地，藉由TFT控制施於液晶兩端的偏壓，來達到顯示的效果，而殘影的產生正是電荷累積的結果，因此降低電荷的大小即可改善殘影現象。所以本設計將共同電壓(Vcom)改成變動形式，來降低液晶的兩端偏壓。Finally, the present invention further discloses a liquid crystal display device having improved image flicker and image sticking, wherein the liquid crystal display device comprises a liquid crystal panel having n pixels, wherein each pixel in the liquid crystal panel is composed of at least a TFT device and a liquid crystal A capacitor is formed. Referring to FIG. 6a and FIG. 6b, in the embodiment, the common voltage (Vcom) of the liquid crystal capacitor forming the pixel in the liquid crystal panel is driven by a DC bias, as shown in FIG. 6a. As shown in the prior art, it is changed to be driven with an AC bias as shown in Figure 6b. Therefore, by adjusting the level of the AC bias, for example, changing the V-com voltage to have a specific voltage level, for example, plus or minus 2 volts, then the voltage of the driving liquid crystal capacitor can be reduced to plus or minus 8 volts. Can be driven. Therefore, the common voltage that can be driven by a DC voltage of 10V can be driven down to 8V, thereby reducing the influence of the electric field on the liquid crystal molecules by lowering the driving voltage, thereby reducing the image sticking phenomenon and not affecting The display performance of the original liquid crystal display device 1. Obviously, the TFT is used to control the bias applied to both ends of the liquid crystal to achieve the display effect, and the generation of residual image is the result of charge accumulation, so reducing the charge size can improve the image sticking phenomenon. Therefore, this design changes the common voltage (Vcom) to a variable form to reduce the bias voltage at both ends of the liquid crystal.
以上所述僅為本發明之較佳實施例，並非用以限定本發明之申請專利權利；同時以上的描述，對於熟知本技術領域之專門人士應可明瞭及實施。因此其他未脫離本發明之技術手段所完成的等效改變或修飾，均應包含在申請專利範圍中。The above description is only the preferred embodiment of the present invention, and is not intended to limit the patent application of the present invention. The above description should be understood and implemented by those skilled in the art. Therefore, other equivalent changes or modifications made without departing from the technical means of the invention should be included in the scope of the patent application.
液晶顯示裝置．．．1Liquid crystal display device. . . 1
液晶面板．．．2LCD panel. . . 2
視訊控制器．．．3Video controller. . . 3
背光模組．．．5Backlight module. . . 5
第1圖 係習知技術所提出之一種改善液晶顯示器下次開機畫面閃爍與畫面殘影的方法流程示意圖。FIG. 1 is a schematic flow chart of a method for improving the blinking of the next startup screen of the liquid crystal display and the residual image of the screen proposed by the prior art.
第2圖 係本發明所提出之一種具有改善畫面閃爍及畫面殘影之液晶面板之示意圖。Fig. 2 is a schematic view of a liquid crystal panel with improved image flicker and residual image of the present invention.
第3圖 係本發明所提出之另一種具有改善畫面閃爍及畫面殘影之液晶面板之示意圖。Fig. 3 is a schematic view showing another liquid crystal panel with improved image flicker and residual image of the present invention.
第4圖 係本發明所提出之一種改善液晶顯示器畫面閃爍與畫面殘影的方法流程示意圖。Fig. 4 is a schematic flow chart showing a method for improving the flicker of a liquid crystal display and the image sticking of the screen proposed by the present invention.
第5圖 係本發明所提出之一種在休眠狀態下改善液晶顯示器畫面閃爍與畫面殘影的方法流程示意圖。FIG. 5 is a schematic flow chart of a method for improving screen flicker and residual image of a liquid crystal display in a sleep state according to the present invention.
第6a圖 係傳統之DC V－com驅動電壓之示意圖。Figure 6a is a schematic diagram of a conventional DC V-com drive voltage.
第6b圖 係本發明所提出之一種AC Level驅動電壓之示意圖。Figure 6b is a schematic diagram of an AC Level driving voltage proposed by the present invention.
液晶顯示裝置．．．1Liquid crystal display device. . . 1
液晶面板．．．2LCD panel. . . 2
視訊控制器．．．3Video controller. . . 3
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| US5784039A (en) * | 1993-06-25 | 1998-07-21 | Hosiden Corporation | Liquid crystal display AC-drive method and liquid crystal display using the same |
| TW588183B (en) * | 2002-06-07 | 2004-05-21 | Hannstar Display Corp | A method and an apparatus for decreasing flicker of a liquid crystal display |
| US20060001640A1 (en) * | 1998-09-19 | 2006-01-05 | Hyun Chang Lee | Active matrix liquid crystal display |
| TWI251200B (en) * | 2004-07-16 | 2006-03-11 | Au Optronics Corp | A liquid crystal display with an image flicker elimination function applied when power-on and an operation method of the same |
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| US5784039A (en) * | 1993-06-25 | 1998-07-21 | Hosiden Corporation | Liquid crystal display AC-drive method and liquid crystal display using the same |
| US20060001640A1 (en) * | 1998-09-19 | 2006-01-05 | Hyun Chang Lee | Active matrix liquid crystal display |
| TW588183B (en) * | 2002-06-07 | 2004-05-21 | Hannstar Display Corp | A method and an apparatus for decreasing flicker of a liquid crystal display |
| TWI257037B (en) * | 2003-07-02 | 2006-06-21 | Toko Inc | Switching-type constant current power supply device |
| TWI251200B (en) * | 2004-07-16 | 2006-03-11 | Au Optronics Corp | A liquid crystal display with an image flicker elimination function applied when power-on and an operation method of the same |
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