1253048 玖 ίο 15 、發明說明： 【發明所屬之技術領域】 本發明是有關於一種 該方法之液晶顯示穿置又補秘、畫質補正方法及使用 對比度之用於輝度補償、是指—種可動態地提昇畫面 晶顯示裝置。 息貝補正方法及使用該方法之液 【先前技術】 目鈾的液晶顯示技術 主動式驅動技術，以被動七、驅動方式可區分為被動式或 要疋由上、下基板與 槪 列矩陣4 ^所構成，並在上、下基板配置行 』矩暉式的掃描電極 ，並配合外部之^ 其運用同步之掃描訊號 示影像的功能，缺而，^ 晶之排列’ $而達到顯 驅動時門各 、、 s知描線數量一增多，則其分配的 4, k成旦面之對比降低，所以被動式· 動技術由於其查皙彻c 1散助式驅 命 、—貝〜反應速率之限制，多用於手錶、計算 ^子子典或行動電話的簡易型液晶顯示面板。 元件二式驅動技術而言，是以電晶體或二極體等主動 、旦素進行開關動作，當掃描訊號輸入時，會 動元件呈開啟灿处 了曰便主 至1查 恕，因此顯示訊號便會由該主動元件傳送 :若主動元件呈關閉狀態時，則顯示訊號保持於 0 i素而使复古4比， 、， 、 改盖 /、记诚功能，並等待下一次的驅動，因此可 述被動式驅動技術的驅動時間與對比問 於攝錄影機夕、 ' ♦ 娀之預視面板、液晶監視器、液晶電視或筆記型 -錢之顯示器等高畫質需求之電子產品。 20 1253048 如圖1所示，為一般主動式薄膜液晶面板9，其主要是 在兩片玻璃基板911、921之間灌注有液晶分子90及間隙子 (Spacer;圖未示），且在玻璃基板92】後並安裝有至少一背 光燈管8 ;其中，在玻璃基板921上佈設有複數掃描線931 及與該等掃描線93 1交錯之複數資料線932，且配合各色顯 示區域在玻璃基板921上設置有複數顯示電極93、儲存電 谷（Storage capacitor;圖未示），及複數薄膜電晶體（TFT)之 主動元件構成的開關元件94。 位在前方的玻璃基板911形成有一由複數子畫素91〇組 _ 成的彩色濾光膜91，其中，各子畫數910係由紅、綠、藍 二原色所組合，而光線在透過彩色濾光膜91之各子畫素 910即產生濾光作用，因此藉由通過各色顯示區域的不同亮 度的光線即顯示該顏色之色光，而以三原色各色之混合加 - 成後便使整個畫面達到全彩之效果。 · 當施加驅動電壓時，該等掃描線93 1便依序將每一行 的開關元件94開啟，以使整排的資料線932對顯示電極93 作充放電調整至所需電壓，而儲存電容則用以儲存該電壓鲁 ;當對一行的顯示電極93充完電後，則關閉該行的開關元 件二m續對下_行進行充電，因此液晶分子％便是依 八。’員示电極93的電場變化來改變其排列方式，使得不同 亮度的光線可通過各子像素而顯示整個畫面。 口 :合圖2、3所示，由於背光燈管8 -般對所有的畫面 :、:::維持輸定亮度的光線謝，因此當光線8()1透過 液曰曰刀子90的排列來表現該畫Φ 71的暗色調時，若彩色 1253048 濾光膜91各子晝素910相間隔處遮蔽不良，則易使投射在 玻璃基板911的光線801在彩色濾光膜91產生漏光8〇2， 進而造成液晶面板9在顯示較暗的畫面71時其晝質容易發 生色溢及霧化的現象。 同理，如圖2、4所示，當液晶面板9在顯示一亮色調 比例較高的晝面72時，由於背光燈管8仍維持輸出一定的 光線801亮度，則容易造成在顯示較亮的晝面72時無法突 顯該亮色調部分所具有的各色之灰階層次。 【發明内容】 有鑑於上述的問題與現象，本發明藉由彳貞測每一輸入 影像晝面之平均灰階值，以動態調整提供液晶面板之顯示 用光源的光線亮度，因此有效地防止晝質之色溢、霧化、 無法犬顯邊梵色调部分的現象，更進一步地，本發明依據 每一輸入影像畫面之灰階圖分佈，對其輝度所分佈範圍較 大的亮階或暗階部分增加其灰階比例；藉由上述調整光線 亮度，及對分佈範圍較大的部分細化其灰階比例二種方式 ’以有效提昇液晶顯示裝置整體的畫面呈現品質。 因此，本發明之一目的，即在於提供一種以動態調整 光線亮度來可提昇畫面對比度之輝度補償方法。 本發明之另一目的，即在於提供一種動態地對畫面輝 度为佈範圍較大的部分細化其灰階比例，以提昇畫面對比 度之液晶顯示畫質補正方法。 本發明之又一目的，即在於提供一種以上述二種方式 來提昇畫面對比度之液晶顯示裝置。 1253048 本發明之可提昇畫面對比度之輝度補償方法，用以處 理輸入一液晶面板之一視頻訊號，且該液晶面板係由一顯 示用光源供應光線以顯示由該視頻訊號轉換之一書面，該 液晶顯示晝質補正方法包含下述步驟：偵測該視頻訊號之 5 一平均灰階值；配合該平均灰階值之大小，動態調整該顯 示用光源之光線輸出量於一預定範圍；及配合調整後之光 線輸出量於該液晶面板上顯示該晝面。 其中’動悲调整係判fe/f该平均灰階值為亮階時，則使 該顯示用光源增加光線輸出量，而於判斷該平均灰階值為 10 暗階時，使該顯示用光源減少光線輪出量。 本發明之提昇畫面對比度之畫質補正方法，用以處理 輸入一液晶面板之一視頻訊號，且該液晶面板係顯示由該 視頻訊號轉換之一畫面，該液晶顯示畫質補正方法包含下 述步驟：由該視頻訊號之灰階圖分佈中，測得其中之一亮 15 階部分之最大灰階值，及一暗階部分之最小灰階值；判斷 該最大灰階值及該最小灰階值兩者之差距是否為超出一預 定範圍，若為超出，則偵測該視頻訊號之灰階圖中，其所 具有之圖素分佈較多者為該亮階抑或該暗階部分，並伸張 該部分之灰階比例以顯示其細部範圍；及以一伽瑪轉換曲 20 線輸出該灰階比例調整後之該視頻訊號於該液晶面板以呈 現最佳化之該畫面。 其中，增加該部分之灰階比例之方式，係細化該亮階 或該暗階部分之灰階區間。 本發明之提昇晝面對比度之液晶顯示裝置，用以處理 1253048 輸入之一視頻訊號，且顯示由該視頻訊號轉換之一晝面， 該液晶顯示裝置包含一液晶面板、一供該液晶面板_顯示 用光源之背光模組，及一電性連接該液晶面板之控制模組 。該控制模組具有一視頻處理單元、一驅動單元及一晝質 處理器。 該視頻處理單元用以接收該視頻訊號轉換為符合該液 晶面板顯示型態之該晝面；該驅動單元電性連接該視頻處 理單兀’用以驅動該液晶面板之畫素；該畫質處理器電性 ίο 15 連接該視頻處理單元及該背光模組，該畫質處理器係偵測 該視頻訊號之一平均灰階值，並配合該平均灰階值之大小 ，動態調整該顯示用光源之光線輸出量於一預定範圍，且 將調整後之光線輸出於該液晶面板上顯示該晝面。 其中，該畫質處理器係由偵測該視頻訊號具有之一灰 P皆圖分佈巾’求得其中之一亮階部分之最大灰階值，及一 暗1"白4刀之最小灰值，並判斷該最大灰階值及該最小^ 階值兩者之差距是否為超出―狀範圍，若為超出，則情 測該視頻訊號之灰階圖中，其所具有之圖素分佈較多者為 該亮階抑或該暗階部分，並伸張該部分之灰階比例以顯示 …、、田德SI，並以-伽瑪轉換曲線輸出該灰階比例調整後 之該視頻訊號於該液晶面板，藉此以呈現最佳化之該晝面 【實施方式】 〜久六他孜術π容、特點與功效， 以下配合參考圖式之—土虚^ , /勹口飞您車乂佳貫施例的詳細說明中，將可 20 1253048 楚的明白。 如圖5所示，為本發明的液晶顯示裝置1，其具有一液 晶面板11、一背光模組12、一控制模組13，及一介面（i/f) 單元14。液晶面板11具有複數晝素1〇，且每一畫素為R、 5 G、B子畫素所組合而成；該介面單元14用以轉接取自外 部影音媒體來源之一連續畫面20之信號，例如個人電腦、 各種電視訊號、DVD或VCD等’由介面單元14接收並編 解碼為合適之視頻訊號201予控制模組13。 控制模組13具有一視頻處理單元13 1、一驅動單元 10 I32及一晝負處理裔133。其中，驅動單元132搞接於液晶 面板11 ’視頻處理單元131係接收介面單元14將視頻訊號 201編解碼後之信號，將其依視頻訊號2〇1的灰階資料予驅 動單元132以產生合適的驅動電壓，並由驅動單元132供 應各晝素10的驅動電壓，以提供液晶面板u的薄膜電晶體 15 (TFT)之主動元件（圖未示）使液晶面板11產生影像。 畫質處理器丨33電性連接背光模組12及視頻處理單元 131 ’其對於背光模組12的控制方面，主要是接收介面單 兀14之視頻訊號201，並偵測視頻訊號2〇丨之一平均灰階 值，接著配合平均灰階值之大小，動態調整顯示用光源的 2〇 f光模組12之光線輸出量於—狀範圍，最後將調整後之 光線輸出於液晶面板u上顯示晝面；至於畫質處理器133 對該視頻處理單元131的控制處理方面，則容後再述。 較佳實施例中，在顯示如圖3所示之較暗晝面時， 月光板組12之光線輸出量係控制在原輸出量之游。，而在 ίο 15 20 1253048 顯示如圖4所示之較亮晝面時，背光模組i2之光線輪出量 係增強至原輸出量之鹏；，然而，上述之光線輸出範圍亦 可視情況予以調整，不以上述調整幅度為限制。 而晝質處理器133對於該視頻處理單& i3i的控制處 理方面，主要是由晝質處理器' 133 _視頻訊號2〇1具有 之-灰階圖分佈中，求得其中之_亮階部分之最大灰階值 ，及一暗階部分之最小灰階值，並判斷最大灰階值及最小 灰階值兩者之差距是否為超出一預定範圍，若為超出，則 伯測視頻訊號2G1之灰階圖中，其所具有之圖素分佈較多 者為亮階抑或讀料，並增加部分之灰階關則申張其 可顯示之細部範圍；接著再由視頻處理單元i3i依照圖6 所示之一伽瑪（Gamma)轉換曲線3〇2，亦即灰階度及亮度增 显值之間的轉換關係，輸出灰階比例調整後之視頻訊號於 液晶面板11，藉此以呈現最佳化之畫面。 如圖6所不，對照一般標準之伽瑪轉換曲線3〇丨，本實 施例使用之伽瑪轉換曲線302在暗部（接近灰階〇的部分）略 為凋降其壳度增益值，而於亮部（接近灰階255的部分）略為修 調昇其亮度增益值，因而亦增加了其對比度之顯示。 配合圖5至圖7所示，說明本發明提昇晝面對比度之 晝質補正方法之步驟，首先，畫質處理器133偵測該影像 源之視頻訊號201(步驟401)，接著計算該視頻訊號2〇1之 灰階圖分佈（步驟402)，由灰階圖分佈中測得最大及最小灰 階值（步驟403)，判斷最大灰階值及最小灰階值兩者之差距 是否為超出一預定範圍（步驟404) ?若兩者之差距超出一 10 1253048 預定範圍，則偵測灰階圖中之圖素分佈較多者，並伸張該 邛刀之灰階比例以顯示其細部範圍（步驟405);若兩者之差 距未超出一預定範圍，則無須調整仍維持原視頻訊號2〇1 之輸出（步驟406)。最後將上述伸張該部分之灰階比例後之 視頻訊號201，由視頻處理單元131以伽瑪轉換曲線3〇2加 以轉換輪出其亮度增益值，用以於液晶面板u上具有之全 體畫素10呈現其畫面（步驟407〜408)。 如圖8所不，當呈現一較為明亮之畫面5丨時，一般之 灰^範圍501為平均分佈之256色階，然而畫面51之亮部 面積#父大，造成在亮白色部分層次感不足；而以本發明之 提幵畫面對比度之畫質補正方法加以處理時，係以灰階範 圍502亮階部分之區域細化後來呈現該晝面，本較佳實施 J中、、、田化後之灰階範圍502為1024階，因此除了可使處 理後之畫面52加強亮白色部分層次感，並使畫面52更為 細緻地表現出其晝質。 歸納上述，由於一般液晶顯示亮部或暗部為大部分區 域之畫面時，不易彰顯其細部之色調層次，本發明是對於 母一影像之平均灰階值，除了以動態調整提供液晶面板U 之月光模組12的輸出光線亮度，更進一步地，本發明依據 母一影像之灰階圖分佈，對其所分佈範圍較大的亮階或暗 P白部分細化其灰階比例，藉由上述調整光線亮度、對分佈 乾圍較大的部分細化其灰階比例二種方式，因此有效地防 止畫質之色溢、霧化、無法突顯該亮色調部分的現象，並 有效提昇液晶顯示裝置1整體的畫面呈現品質。 1253048 惟以上所述者，僅為本發明 η〈孕乂佳貫施例而已，當不 能以此限定本發明實施之範圍， 卩大凡依本發明申請專利 範圍及發明說明書内容所作綷 合所作之間早的等效變化與修飾，皆 應仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖 1是一部分剖視圖’說明一般主動式薄 之組成構造； 膜液晶面板 ίο 15 20 圖2是一示意圖，說明一般液晶面板之漏光現象，· 圖3是一畫面，說明液晶面板在顯示較暗的畫面時， 其畫質容易發生色溢及霧化的現象； 卜^ 疋旦面，說明液晶面板在顯示較亮的畫面時， 無法突顯該亮色調部分所具有的各色之灰階層次； 圖5疋一電路方塊圖，說明為本發明的液晶顯示裝置 圖6是一曲線圖，說明本發明之一伽瑪轉換曲線對照 一般標準之伽瑪轉換曲線； 圖7疋一流程圖，說明本發明提昇晝面對比度之晝質 補正方法之步驟；及 、圖8是一對照圖，說明一較為明亮之畫面，其灰階範 圍為平均分佈，而以本發明之晝質補正方法處理時，係以 白範圍冗階部分之區域細化後之灰階範圍來呈現，因此 可得到另一加強亮白色部分層次感之畫面。 12 1253048 【圖式之主要元件代表符號說明】 1 液 晶 顯 示 裝 置 14 介面單元 10 晝 素 20 連續畫面信號 11 液 晶 面 板 201 視頻訊號 12 背 光 模 組 301 、302伽瑪轉換曲線 13 控 制模 組 40L· -408步驟 131 視 頻 處 理 單 元 51 > 52 晝面 132 驅 動 單 元 501 、5 02灰階範圍 133 畫 質 處理 器 131253048 玖ίο 15 , invention description: [Technical field of the invention] The present invention relates to a method for liquid crystal display insertion and replenishment, image quality correction method and contrast ratio for luminance compensation, which means Dynamically enhance the picture crystal display device. The method of correcting the Beibei and the liquid using the method [Prior Art] The active driving technology of the liquid crystal display technology of the uranium is passive, and the driving method can be divided into passive or the upper and lower substrates and the matrix. It is configured to arrange the scanning electrodes on the upper and lower substrates, and cooperate with the external ones to use the synchronous scanning signal to display the image function, and the crystal arrangement is '$ and the display is driven. When the number of known lines is increased, the contrast of the 4, k-denier of the distribution is reduced, so the passive type of motion technology is used because of its c1-assisted drive, the limit of the reaction rate. A simple LCD panel for watches, computing, or mobile phones. In the case of the component two-type driving technology, the switching operation is performed by an active transistor such as a transistor or a diode. When the scanning signal is input, the moving component is turned on, and the main component is turned on, so that the display signal is displayed. It will be transmitted by the active component: if the active component is in the off state, the display signal remains at 0%, and the retro 4 ratio, ,, , change/write, and the next drive, so The driving time and contrast of passive driving technology are related to the high-definition electronic products such as video camera, ' ♦ 预 pre-view panel, LCD monitor, LCD TV or notebook-money monitor. 20 1253048 As shown in FIG. 1 , it is a general active thin film liquid crystal panel 9 mainly filled with liquid crystal molecules 90 and spacers (not shown) between two glass substrates 911 and 921, and on a glass substrate. 92] at least one backlight tube 8 is mounted thereon; wherein a plurality of scanning lines 931 and a plurality of data lines 932 interlaced with the scanning lines 93 1 are disposed on the glass substrate 921, and the display areas of the respective colors are matched on the glass substrate 921. A switching element 94 composed of a plurality of display electrodes 93, a storage capacitor (not shown), and an active element of a plurality of thin film transistors (TFTs) is disposed. The glass substrate 911 located at the front side is formed with a color filter film 91 composed of a plurality of sub-pixels 91, wherein each sub-picture number 910 is combined by two primary colors of red, green and blue, and the light is transmitted through the color. Each sub-pixel 910 of the filter film 91 produces a filtering effect. Therefore, by displaying the color light of the color by the light of different brightness of the display areas of the respective colors, the mixture of the three primary colors is added to form the entire image. Full color effect. When the driving voltage is applied, the scanning lines 93 1 sequentially turn on the switching elements 94 of each row, so that the entire row of data lines 932 are charged and discharged to the display electrodes 93 to adjust to the required voltage, and the storage capacitors are For storing the voltage Lu; when the display electrode 93 of one row is fully charged, the switching element of the row is turned off and the next row is charged, so the liquid crystal molecule % is eight. The electric field of the electrode 93 changes to change its arrangement so that light of different brightness can display the entire picture through each sub-pixel. Port: As shown in Figures 2 and 3, because the backlight tube 8 is generally used for all screens:, ::: to maintain the brightness of the input brightness, so when the light 8 () 1 through the arrangement of the liquid boring knife 90 When the dark hues of the Φ 71 are expressed, if the color 1253048 filter film 91 is poorly shielded at intervals, the light 801 projected on the glass substrate 911 is likely to cause light leakage in the color filter film 91. Further, when the liquid crystal panel 9 displays a dark screen 71, the enamel is likely to cause color overflow and fogging. Similarly, as shown in FIG. 2 and FIG. 4, when the liquid crystal panel 9 displays a face 72 having a high proportion of bright tones, since the backlight tube 8 still maintains a certain brightness of the light 801, it is easy to cause a brighter display. When the facet 72 is 72, the gray level of each color of the bright color portion cannot be highlighted. SUMMARY OF THE INVENTION In view of the above problems and phenomena, the present invention effectively adjusts the brightness of light provided by a display light source for a liquid crystal panel by measuring the average gray scale value of each input image surface, thereby effectively preventing flaws. The color overflow, atomization, and the phenomenon that the dog can't display the color of the Vatican. Further, the present invention is based on the gray-scale map distribution of each input image, and the bright or dark order with a large range of luminance is distributed. Partially increase the gray scale ratio; by adjusting the brightness of the light and refining the gray scale ratio of the portion with a large distribution range to effectively improve the overall picture quality of the liquid crystal display device. Accordingly, it is an object of the present invention to provide a luminance compensation method for enhancing the contrast of a picture by dynamically adjusting the brightness of the light. Another object of the present invention is to provide a liquid crystal display image quality correcting method for dynamically refining the gray scale ratio of a portion whose screen luminance is large in order to improve the contrast of the screen. Another object of the present invention is to provide a liquid crystal display device which improves the contrast of a picture in the above two ways. 1253048 The brightness compensation method for improving picture contrast of the present invention is for processing a video signal input to a liquid crystal panel, and the liquid crystal panel is supplied with light by a display light source to display one of the video signal conversions, the liquid crystal The method for displaying the enamel correction comprises the steps of: detecting an average grayscale value of the video signal; and dynamically adjusting the light output of the display light source to a predetermined range according to the average grayscale value; The subsequent light output shows the face on the liquid crystal panel. Wherein the 'movement adjustment system judges that the average grayscale value is a bright order, the display light source increases the light output amount, and when the average grayscale value is determined to be 10 dark steps, the display light source is made Reduce the amount of light rotation. The image quality correction method for improving the image contrast of the present invention is configured to process a video signal input to a liquid crystal panel, and the liquid crystal panel displays a picture converted by the video signal, and the liquid crystal display image quality correction method comprises the following steps : determining, by one of the gray scale maps of the video signal, a maximum gray scale value of one of the 15th order portions and a minimum gray scale value of a dark step portion; determining the maximum gray scale value and the minimum gray scale value Whether the difference between the two is beyond a predetermined range, and if it is exceeded, detecting that the gray-scale image of the video signal has a greater distribution of pixels, the brighter or the darker portion, and the extension Part of the gray scale ratio to display the detail range; and output the gray scale scale adjusted video signal to the liquid crystal panel to represent the optimized image by a gamma conversion curve 20 lines. Wherein, the manner of increasing the gray scale ratio of the portion is to refine the gray level interval of the bright step or the dark portion. The liquid crystal display device for improving the contrast of the present invention is configured to process a video signal of 1253048 input and display one of the video signal conversions, the liquid crystal display device comprises a liquid crystal panel, and the liquid crystal panel is provided for display. A backlight module using a light source, and a control module electrically connected to the liquid crystal panel. The control module has a video processing unit, a driving unit and a enamel processor. The video processing unit is configured to receive the video signal into a face that conforms to the display mode of the liquid crystal panel; the driving unit is electrically connected to the video processing unit to drive a pixel of the liquid crystal panel; the image quality processing The image processing unit and the backlight module are connected to the video processing unit, and the image quality processor detects an average grayscale value of the video signal, and dynamically adjusts the display light source according to the average grayscale value. The light output is within a predetermined range, and the adjusted light is outputted on the liquid crystal panel to display the surface. Wherein, the image quality processor is configured to detect that the video signal has one of the gray P maps to obtain a maximum gray scale value of one of the bright portions, and a dark 1 " white 4 knife minimum gray value And determining whether the difference between the maximum grayscale value and the minimum threshold value is beyond the "range", and if it is exceeded, the grayscale diagram of the video signal has a greater distribution of pixels The brightness level or the dark step portion is extended, and the gray scale ratio of the portion is stretched to display..., and the Tiande SI, and the grayscale scale adjusted video signal is outputted to the liquid crystal panel by a gamma conversion curve. In order to optimize the face of the face [Embodiment] ~ Jiuliu 孜 π π 、 、 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 特点 土 土 土 土 土 土 土 土For a detailed description of the example, it will be understood by 20 1253048. As shown in FIG. 5, the liquid crystal display device 1 of the present invention has a liquid crystal panel 11, a backlight module 12, a control module 13, and an interface (i/f) unit 14. The liquid crystal panel 11 has a plurality of pixels, and each pixel is a combination of R, 5 G, and B sub-pixels; the interface unit 14 is configured to transfer a continuous picture 20 taken from an external audio and video media source. Signals, such as personal computers, various television signals, DVDs or VCDs, etc., are received by the interface unit 14 and encoded into suitable video signals 201 to the control module 13. The control module 13 has a video processing unit 13 1 , a driving unit 10 I32 and a negative processing 133. The driving unit 132 is connected to the liquid crystal panel 11'. The video processing unit 131 receives the signal from the interface unit 14 to encode and decode the video signal 201, and applies the grayscale data according to the video signal 2〇1 to the driving unit 132 to generate a suitable signal. The driving voltage is supplied to the driving voltage of each of the halogen elements 10 by the driving unit 132 to provide an active element (not shown) of the thin film transistor 15 (TFT) of the liquid crystal panel u to cause the liquid crystal panel 11 to generate an image. The image quality processor 丨33 is electrically connected to the backlight module 12 and the video processing unit 131. The control aspect of the backlight module 12 is mainly to receive the video signal 201 of the interface unit 14 and detect the video signal 2 An average gray scale value, and then with the average gray scale value, dynamically adjust the light output of the 2〇f optical module 12 of the display light source in a range of -, and finally output the adjusted light output on the liquid crystal panel u The aspect of the control processing of the video processing unit 131 by the image quality processor 133 will be described later. In the preferred embodiment, when the darker face as shown in FIG. 3 is displayed, the light output of the moonlight panel 12 is controlled by the original output. When ίο 15 20 1253048 displays the brighter surface as shown in FIG. 4, the light output of the backlight module i2 is enhanced to the original output; however, the above-mentioned light output range may also be Adjustments are not limited by the above adjustment range. The control processing of the video processing unit & i3i by the enamel processor 133 is mainly obtained by the gradation processor ' 133 _ video signal 2 〇 1 - gray scale map distribution, and the _ brightness step is obtained. a part of the maximum gray scale value, and a minimum gray scale value of a dark step portion, and determining whether the difference between the maximum gray scale value and the minimum gray scale value is beyond a predetermined range, and if it is exceeded, the beta video signal 2G1 In the gray scale diagram, the pixel distribution has more brightness or reading material, and adds a part of the gray level to the extent of the detail that can be displayed; and then by the video processing unit i3i according to FIG. One of the gamma conversion curves 3〇2 is shown, that is, the conversion relationship between the gray scale and the brightness increase value, and the output gray scale scale adjusted video signal is on the liquid crystal panel 11, thereby presenting the most The picture of Jiahua. As shown in FIG. 6, compared with the gamma conversion curve 3 of the general standard, the gamma conversion curve 302 used in this embodiment slightly degrades the shell gain value in the dark portion (the portion close to the gray scale ,), and The part (the part close to the gray level 255) slightly adjusts its brightness gain value, thus increasing its contrast display. As shown in FIG. 5 to FIG. 7 , the steps of the method for improving the contrast of the contrast of the present invention are described. First, the image quality processor 133 detects the video signal 201 of the image source (step 401), and then calculates the video signal. The gray scale map distribution of step 2 (step 402), the maximum and minimum gray scale values are measured from the gray scale map distribution (step 403), and it is determined whether the difference between the maximum gray scale value and the minimum gray scale value is beyond one. a predetermined range (step 404). If the difference between the two exceeds a predetermined range of 10 1253048, the pixel distribution in the grayscale map is detected to be larger, and the gray scale ratio of the file is extended to display the detailed range (steps) 405); if the difference between the two does not exceed a predetermined range, the output of the original video signal 2〇1 is maintained without adjustment (step 406). Finally, the video signal 201 after the gray scale ratio of the portion is stretched by the video processing unit 131 by the gamma conversion curve 3〇2 to output its brightness gain value for the entire pixel on the liquid crystal panel u. 10 presents its picture (steps 407-408). As shown in Fig. 8, when a brighter picture 5丨 is presented, the general gray range 501 is an average distribution of 256 levels, but the bright area of the picture 51 is #大大, resulting in insufficient layering in the bright white part. When the image quality correction method of the present invention is used to correct the image quality, the area of the gray level range 502 is refined and then the surface is presented, which is preferably implemented in J, and after the field. The gray scale range 502 is 1024 steps, so that in addition to making the processed picture 52 enhance the layering of the bright white portion, the picture 52 is more detailed in its enamel. In summary, since the bright portion or the dark portion of the liquid crystal display is a picture of most areas, it is difficult to highlight the tone level of the detail. The present invention is an average gray level value for the mother image, except that the moonlight of the liquid crystal panel U is provided by dynamic adjustment. The brightness of the output light of the module 12, further, the present invention refines the gray scale ratio of the bright or dark P white portion of the larger distribution range according to the gray scale map distribution of the mother image, by the above adjustment The brightness of the light and the portion with a large distribution of the dry circumference refine the gray scale ratio, thereby effectively preventing the color of the image quality from overflowing, atomizing, and not highlighting the phenomenon of the bright color portion, and effectively improving the liquid crystal display device 1 The overall picture quality. 1253048 However, the above description is only for the purpose of the present invention, and the scope of the invention is not limited thereto, and the scope of the invention and the content of the invention are made between Early equivalent changes and modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing a general active thin composition structure; a film liquid crystal panel ίο 15 20 FIG. 2 is a schematic view showing a light leakage phenomenon of a general liquid crystal panel, FIG. 3 is a screen illustrating a liquid crystal When the panel displays a darker picture, the picture quality is prone to color overflow and fogging. The surface of the panel indicates that the liquid crystal panel cannot highlight the colors of the bright color part when displaying a brighter picture. Figure 5 is a circuit block diagram illustrating the liquid crystal display device of the present invention. Figure 6 is a graph illustrating a gamma conversion curve of a gamma conversion curve of the present invention against a general standard; The figure illustrates the steps of the enamel correction method for improving the contrast of the kneading surface; and FIG. 8 is a comparison diagram illustrating a relatively bright picture whose gray scale range is an average distribution, and the enamel correction method of the present invention In the processing, the grayscale range is refined in the region of the white-range redundant portion, so that another layer of enhanced bright white partial layering can be obtained. 12 1253048 [Description of main components of the diagram] 1 LCD device 14 Interface unit 10 Alizarin 20 Continuous picture signal 11 LCD panel 201 Video signal 12 Backlight module 301, 302 Gamma conversion curve 13 Control module 40L · 408 Step 131 Video Processing Unit 51 > 52 Facet 132 Driving Unit 501, 5 02 Gray Level Range 133 Image Quality Processor 13