200837692 九、發明說明： • 【發明所屬之技術領域】 本發明係關於一種液晶顯示器之動態背光控制方法， 尤指一種藉由分析及計算圖框資料之灰階值分布，進而控 制背光模組之亮度，以調整畫面明暗之液晶顯示器之動態 背光控制方法，達到降低背光模組之能量消耗，增強晝面 品質之目的。 '' 【先前技術】 傳統液晶顯示器之背光模組係如第1圖所示，該背光 模組9係包含一擴散板91、一反射板92及複數個發光元 件93，其中該反射板92及發光元件93係設於擴散板91 之一側，各發光元件93整齊排列設於反射板92及擴散板 91之間，該反射板92具有反射面921以反射光線用，尤 其是，該反射板92之反射面921係設為複數個凹孤，各凹 I 弧容納一發光元件93，發光元件93之光線直接穿透擴散 板91，或經由反射板92反射後穿過擴散板91，而發光元 件93之明亮係由一控制器（未圖示）控制，一般常見之發光 元件係為如標號93所示燈管狀之CCFL(冷陰極燈管，Cold Cathode Fluorescent Lamp)，CCFL 93常由逆壓控制器 (inverter controller，未圖示）進行脈衝寬度調變（Pulse Width Modulation，PWM)。 5 200837692 隨著LED之普及，將複數個lEd 941間隔排列於條狀 • 板942上作成之條狀燈板94，亦可取代標號93之CCFL ' 以作為發光元件，而條狀燈板94之脈衝寬度調變（PWM) 則由LED驅動控制器（LED ddver⑶价⑺^^，未圖示）控制。 無論是使用CCFL 93或是條狀燈板94作為背光模組9 之發光兀件，隨著液晶顯示器之面板尺寸不斷增加，提供 赛 光源之背光模組9之耗電量相對提高不少，以65吋液晶電 厂視來說，其背光模組9所需之電源供應即在瓦以上， 相當於壹台電暖器開機所需之消耗量，尤其是，只要處於 開錄態，背光模組9之發光元件將維持全亮狀態，僅由 yn®板之液晶分子狀態以改變亮度，長期使用下 Λ: 耗非系可觀，因此如何大幅降低背光模組之電 ㈣耗’減少能源浪費，符合環保概念，已成為液晶顯示 , 為領域之投入者須深入思考之問題。 —有!孤於此’本案之發明人累積多年相關領域設計製造 之經驗，經不斷思考、製造及修正，遂有本發明之誕生以 解決上述問題。 【發明内容】 本無明之主要目的係提供一種液晶顯示器之動態背光 :1方法#具有顯著降低背光模組之電能消耗量之功 效，替使用者省下許多用電成本。 6 200837692 本發明之另一目的係提供一種液晶顯示器之動態背光 • 控制方法，其控制背光模組以隨不同圖框資料之灰階碼調 - 整亮度，進而節省背光模組之耗電量。 本發明之又一目的係提供一種液晶顯示器之動態背光 控制方法，其具有提高對比、提升螢幕畫質之功效。 為了達到上述目的，本發明之液晶顯示器包含一具有 發光元件以提供光源之背光模組及控制該背光模組亮度之 ' 背光控制單元，本發明之液晶顯示器之動態背光控制方法 包含：液晶顯示器接收一圖框資料，該圖框資料包含複數 個原始灰階碼，接著，將原始灰階碼依各灰階值之不同進 行數量分布統計及數值運算，然後，依數值運算之結果， 將原始灰階碼對應至複數個修正灰階碼，最後，將修正灰 階碼傳送至該液晶顯示器面板，以調整背光模纟且呈現之亮 度。 ’ϋ I 其中，進行數量分布統計時，係依數量分布统計結果， 計算加權平均灰階碼以供進一步分析判斷用，或是，以位 元截切（bit truncate)方式取原始灰階碼之最大顯著位元 (MSB)，以縮減需處理之資料量。 其中，本發明可同時控制背光模組所有的發光元件， 以進行螢幕之明暗變化，或是，藉由控制背光楔組令發光 元件以線性排列，以進行螢幕之條狀明暗變化，戋者是， 7 200837692 藉由控制背光模組，以塊狀區分而進行區塊狀明暗變化， ’ 達到为光控制單元之亮度調整之目的。 • 【實施方式] 為令本聲明所運用之技術内容、發明目的及其達成之 功效有更完整且清楚的揭露，茲於下詳細說明之，並請_ 併參閱所揭之圖式及圖號： 理論上，光學影像資料係由RGB(紅綠藍）三種顏色所 ’ 組成，每一翱色之明暗是由灰階值(gray level)來代表，而 母灰％值則對應之一灰階碼（code)，於本實施例將以8 位兀之灰階顯示來做說明，亦即亮度之明暗將由總灰階數 為2 =256個來代表，也就是說從白到黑之間的每一灰階值 是以0~ 255之灰階碼來表示。 一般而言，液晶顯示器主要包含一背光模組以及控制 €, ^亥月光模組之亮度之背光控制單元，該背光模組包含發光 \ 一 元件以提供光源，該發光元件可為習用CCFL、LED或其 他適當之發光裝置所組成。 接著，請參閱第2圖所示，其係先以一設於液晶顯示 时之日$序控制益1之硬體架構作實施例來說明本發明，當 液a日顯示恭開始接收影像後，影像具有一個以上之圖框資 料，该圖框資料將包含複數個原始灰階碼(c〇de)，該圖框資 料被輸入時序控制器丨後將分別經過一亮度計算單元丨丨及 8 200837692 -㈣修正單元12’該亮度計算單元u將對原始灰階碼 4 (code)依各灰階值(graylevel)之不同進行數量分布統計，並 - 依統計結果進行判斷及數值計算，再由數值計算之結果， 令原始灰階碼對應至複數個修正灰階碼。 接著，所有修正灰階碼同時分別被傳送至資料修正單 兀12以及背光控制單元14，以供資料修正單元ι2及背光 控制單元14做同步調整，其中，該資料修正單元12將修 正灰階碼與原始灰階碼進行比對分析，以使影像品質最佳 化，並輸出複數個調整灰階碼至一時序控制單元13，該時 序控制單兀η將會把代表圖框資料之調整灰階碼及控制 訊號輸出至液晶顯示器之面板，以控制液晶分子之狀態及 調整面板之明暗。 當修正灰階碼傳輸至背光控制單元14時，該背光控制 單元14則將透過逆壓器（invener)或哪驅動控制器（如標 ' 號15所示）來控制背光模組之發光單元之亮度，亦即發2 單元受不同修正灰階碼控制而呈現不同亮度，尤其是呈現 車乂暗7C度之灰階碼將使背光模組之亮度調降，進而節省電 能消耗。 上述冗度。十异單元進行數量分布統計時，若以圖表之 長條圖來表示則如第3圖所示，其中X轴係表示0〜255之 灰Ρ白碼刀布Υ轴則表示各灰階碼於該圖框資料之個數， 9 200837692 由此即可看出各灰階碼數量分布之多寡及比重，接著可進 * 一步依數量分布統计結果計异加權平均灰階碼，以供後續 . 分析判斷用。 除了直接進行數量分布分析之外，亦可進行位元截切 (bit truncate)技術以取原始灰階碼之最大顯著位元(Msb)， 藉此縮減需處理之資料量，請參閱第4圖所示，我們捨棄 複數個LSB(Least Significant Bits)資料位元而留下複數個 c MSB(Most Significant Bits)資料位元以代替原本之灰階 碼，如以取MSB 5bits為例，當灰階碼具有8位元⑻⑻之 資料量，因LSB之改變最多使灰階碼差7而已，故對整個 影像改變不大且人類用肉眼很難察覺出來，卻可達到達到 大量縮減資料量之目的。 該資料修正單元將該原始灰階碼對應至修正灰階碼可 有各種方式，本發明提出其中數種以作為實施例： 、 請參閱第5圖所示，其係為對應之第一種方式，令原 始灰卩6碼為inPut(X軸）’修正灰階碼為output(Y轴），未做 任何修正前，如第5圖之左侧，灰階碼之input將等於 tpUt ’故其對應呈一直線(如標號51所示），進行修正後 則如第5圖之右側，其中當圖框資料之原始灰階瑪之最大 值小於255，則令該最大原始灰階碼（Max· code)對應至最 大修正灰階碼，於本實施例，該最大修正灰階碼為255， 200837692 則其餘原始灰階碼與修正灰階碼之對應將滿足下列公式： 修正灰階碼=原始灰階碼x 多正灰卩隻多 .............(1) 最大原始灰階碼 因此’上述公式呈現於直角座標上則如標號52所示之 直線’然而為了避免最大原始灰階碼過小而使得灰階碼之 修正失去意義，我們將設有一最低限制灰階碼53，當該最 大原始灰階碼小於該最低限制灰階碼53時，則以該最低限 制灰階碼53為最大原始灰階碼，呈現於直角座標上則如標 號54所示之直線。 除此之外，該原始灰階碼與修正灰階碼之間的關係亦 可進一步有下列數種對應之實施例： 首先同樣參照第5圖右側所示之直角座標，當最大原 始灰階碼小於255時，取一如標號55之曲線，該曲線55 通過座標（〇,〇)及座標（最大原始灰階碼(Max. code),最大修 正灰階碼），令原始灰階碼與修正灰階碼之對應滿足該曲線 55且落於上述二座標間，該標號55之曲線位於標號52之 直線左側，甚至可使該曲線55滿足人眼對灰階亮度之視覺 響應而符合負伽瑪關係’隨著最大原始灰階碼之不同，而 有不同曲線以滿足原始灰階碼與修正灰階碼之對應。 如前所述，為了避免最大原始灰階碼過小而使得灰階 碼之修正失去思義’同樣將預设"如上述所提到之最低限 制灰階碼53，使得該最大原始灰階碼小於該最低限制灰階 200837692 碼《時，以該最低限制灰階碼53為最大原始灰階碼，呈 • 現於直角座標上則如標號56所示之曲線。 接著請麥照第6圖所示，其係原始灰階碼與修正灰階 碼對應關狀第三種實施例，與前—實_最大不同在 =··該通過座標（〇,〇)及座標（最大原始灰階碼（Max. c〇de)， 取大修正灰階碼）之曲線（標號61)落於標號62之直線右 f 側，甚至可使該曲線61滿足人眼對灰階亮度之視覺響應而 4合正伽瑪關係；同理，我們可預設一最低限制灰階碼63, 使％该最大原始灰階碼小於該最低限制灰階碼63時，則以 咸最低限制灰階碼63為最大原始灰階碼，呈現於直角座標 上，則原始灰階碼與修正灰階碼對應關係滿足如標號64所 示之曲線。 再請芩閱第7圖所示，其係原始灰階碼與修正灰階碼 : 對應關係之第四種實施例，此實施例係將input與〇mput 相等之直線(標號71)進行偏移，亦即，如標號72所示之曲 線其灰階碼較大的部分之線段與標號71之直線相平行，且 通過座標（最大原始灰階碼(Max· c〇de)，最大修正灰階碼）， 灰階碼較小之部分則如第7A圖之放大圖所示將成一弧線 且通過座標（〇,〇)，隨著最大原始灰階碼之不同，而有不同 之曲線以滿足原始灰階碼與修正灰階碼對應。 同樣地’為了避免最大原始灰階碼太小影響灰階碼之 12 200837692 修正，此將預設-最低限制灰階碼73，使得該最大原始灰 .階碼小於該最低限制灰階瑪7 3時，則㈣最低限制灰階碼 • 73為最大原始灰階碼，呈現於直角座標上則如標號74所 示之曲線。 又請參閱第8圖所示，其係原始灰階碼與修正灰階碼 對應關係之第五種實施例，此方法所^之曲線(標號81)將 通過座標（〇,〇)及座標（最大原始灰階碼(Max· c〇de)，最大修 . 正灰階碼），與前述實施例不同之處在於該曲線81係呈S 形，亦即曲線81於較大灰階碼之區域之弧度向左偏，曲線 81於較小灰階碼之區域之弧度將呈現向右偏，以此曲線 進行灰階碼修正，不僅減少亮光時間，降低背光模組電能 消耗，同時可增強影像品質，除了標號81之曲線，經由實 驗、實測或理論，亦可提出其他s形曲線作為原始灰階碼 與修正灰階碼之對應，並提高晝面色彩效果。 I 無論使用上述何種原始灰階碼與修正灰階碼之對應方 式，jg光控制單元將依修正後之灰階碼進行亮度調降或升 高，隨著發光元件之不同及亮度控制之需求，該背光控制 單元之亮度調整可有下列多種變化： 其一係同時控制背光模組之所有發光元件而同時進行 明暗變化，亦即亮度的改變係為整個面板。 其一係令發光元件以線性排列而進行條狀明暗變化， 13 200837692 例如以LED組成之條狀燈板作為發光元件，則背光控制單 元可依不同位置條狀燈板分別控制亮度，故面板之明暗係 ' 呈條狀分布及改變。 其三係令發光元件以塊狀區分而進行區塊狀明暗變 化’例如將背光模組之發光元件以矩形進行區分，背光控 制單元分別獨立控制各區塊内之發光元件，依據各區塊内 之圖框資料進行亮度控制，而各區塊間之亮度變化可為逐 乂改變，以避免過大之亮度差異而被人眼察覺。 上述焭度之控制方式各有其優缺點，故可單一使用或 心合應用，但皆可使背光模組之電能消耗減少，提升晝面 影像之品質。 再請參閱第9圖所示，其係以流程圖方式呈現本發明 之應用，當圖框資料被輸入後(標號1〇1)，即進行該圖框資 料之灰階值數量分布統計(標號1〇2)，接著進行是否為靜態 旦面之判斷(標號103)，若為靜態晝面，則以持續保持亮度 或細紐亮度變化時間來處理（標號1〇4)，接著再回到圖框資 料接收之步驟。 右非靜態晝面，表示晝面已與前一晝面不同，但也無 須每一動態畫面皆進行背光動態控制，於此實施例，取原 σ灰階碼之最大值(Max)和平均值(Ave)相互判斷比較（標號 1〇5)，若最大值與平均值相近或相等，則不進行圖框資料 14 200837692 之改變（標號106)，而背光強度則維持最大（標號1〇7)，然 後開始接收下-個圖框資料(標號1G8)並重複前述步驟。 若最大值大於平均值，則進行是否灰階碼修正之判斷 (標號109) ’若最大原始灰階碼等於255，則不進行灰階碼 修正(標號U〇)，背光強度維持最大(標號111)，若最大原 始灰階碼小於255 ’則可勒上述縣灰階碼與修正灰階 =對應_(標號112) ’得到修正後之修正灰階碼，並依 梭^修正灰階碼進行背光強度之姆(標號〗13)，減少背光 、組„ ’㈣㈣下—麵框資料之接收(標號剛 域^複則^步驟’然而’上述步驟或判斷係為所屬技術領 為限具有通常知識者可任意修改與變化者，不以此實施例 制，^ 結果顯示’以上述方法進行動態背光控 面呈現更為=丁态之電量消耗最高可節省25%，且影像晝 符人W 本發明確實可達到節省電能、降低耗能、 %保精神之 質之俱· 的’且進而具有提升晝面對比、提升畫 、乂" 1良點；然而，、, . 則述之實施例或圖示並非限定本發明之 馬鳧順序或公4， 應至修正太比>，例如進行數量分布統計、原始灰階碼對 从μ、+、h &馬之方式或背光模組之亮度控制方式，並不 乂上述實施例為隈, # 任何所屬技術領域中具有通常知識者 15 200837692 之適當變化或修飾，皆應視為不脫離本發明之專利範疇。 。 綜上所述，本發明實施例確能達到所預期之使用功 ， 效，又其所揭露之具體方法，不僅未曾見諸於同類產品中， 亦未曾公開於申請前，誠已完全符合專利法之規定與要 求，爰依法提出發明專利之申請，懇請惠予審查，並賜准 專利，則實感德便。 【圖式簡單說明】 /第1圖：習知背光模組結構之示意圖 第2圖：本發明以時序控制器之架構作說明之示意圖 第3圖：本發明以長條圖說明數量分布統計之示意圖 第4圖：本發明說明位元截切技術之示意圖 第5圖：本發明說明原始灰階碼對應至修正灰階碼之 一實施例之示意圖 第6圖：本發明說明原始灰階碼對應至修正灰階碼之 \ 另一貫施例之不意圖 第7圖：本發明說明原始灰階碼對應至修正灰階碼之 又一實施例之示意圖 第7A圖：第7圖之局部放大圖 第8圖：本發明說明原始灰階碼對應至修正灰階碼之 再一實施例之示意圖 第9圖：本發明一實施例之流程圖 16 200837692 【主要元件符號說明】 <本發明> 1 時序控制器 11亮度計算單元 12 資料修正單元 13 時序控制單元 14 背光控制單元 15 51，52,54,62,71 53,63,73 55,56,61，72,74,81 10Γ 113 <現有技術> 9 背光模組 91 擴散板 92 反射板 921反射面 93 94 條狀燈板 941 LED 942條狀板 逆壓器或LED驅動控制器 直線 最低限制灰階碼 曲線 流程圖之步驟 發光元件（CCFL) 17200837692 IX. Description of the invention: • Technical field of the invention The present invention relates to a dynamic backlight control method for a liquid crystal display, and more particularly to a method for controlling a backlight module by analyzing and calculating the gray scale value distribution of the frame data. Brightness, to adjust the dynamic backlight control method of the liquid crystal display of the screen, to reduce the energy consumption of the backlight module and enhance the quality of the kneading surface. [Background] The backlight module of the conventional liquid crystal display is as shown in FIG. 1 , the backlight module 9 includes a diffusing plate 91 , a reflecting plate 92 and a plurality of light emitting elements 93 , wherein the reflecting plate 92 and The light-emitting elements 93 are disposed on one side of the diffusing plate 91, and the light-emitting elements 93 are arranged neatly between the reflecting plate 92 and the diffusing plate 91. The reflecting plate 92 has a reflecting surface 921 for reflecting light, in particular, the reflecting plate. The reflecting surface 921 of the 92 is a plurality of concave orphans, and each concave I arc accommodates a light-emitting element 93. The light of the light-emitting element 93 directly penetrates the diffusing plate 91, or is reflected by the reflecting plate 92 and then passes through the diffusing plate 91 to emit light. The brightness of the element 93 is controlled by a controller (not shown). The commonly used light-emitting element is a CCFL (Cold Cathode Fluorescent Lamp) as shown by the numeral 93, and the CCFL 93 is often reversed. An inverter controller (not shown) performs Pulse Width Modulation (PWM). 5 200837692 With the popularity of LEDs, a plurality of lEd 941 are arranged at intervals on a strip-shaped board 942 to form a strip-shaped light board 94, which can also be used as a light-emitting element instead of the CCFL' of the numeral 93, and the strip-shaped light board 94 Pulse width modulation (PWM) is controlled by the LED driver controller (LED ddver (3) price (7) ^ ^, not shown). Regardless of whether the CCFL 93 or the strip light board 94 is used as the light-emitting element of the backlight module 9, as the panel size of the liquid crystal display continues to increase, the power consumption of the backlight module 9 that provides the race source is relatively improved. As for the 65-inch LCD power plant, the power supply required for the backlight module 9 is above the wattage, which is equivalent to the consumption required for the power-on of the battery heater. In particular, as long as it is in the open state, the backlight module 9 The illuminating element will remain fully bright, only by the liquid crystal state of the yn® board to change the brightness, and the long-term use of the squat: the consumption is not significant, so how to greatly reduce the power of the backlight module (four) consumption 'reduce energy waste, in line with environmental protection The concept has become a liquid crystal display, a problem that must be deeply pondered by the input of the field. —Yes! I am alone. The inventor of this case has accumulated many years of experience in designing and manufacturing related fields. After continuous thinking, manufacturing and revision, the invention has been born to solve the above problems. SUMMARY OF THE INVENTION The main purpose of the present invention is to provide a dynamic backlight of a liquid crystal display: 1 method # has the effect of significantly reducing the power consumption of the backlight module, and saves the user a lot of electricity costs. 6 200837692 Another object of the present invention is to provide a dynamic backlight control method for a liquid crystal display, which controls the backlight module to adjust the brightness of the backlight module according to the gray scale code of different frame data, thereby saving the power consumption of the backlight module. Another object of the present invention is to provide a dynamic backlight control method for a liquid crystal display, which has the effects of improving contrast and improving screen quality. In order to achieve the above object, the liquid crystal display of the present invention comprises a backlight module having a light-emitting element for providing a light source and a backlight control unit for controlling the brightness of the backlight module. The dynamic backlight control method of the liquid crystal display of the present invention comprises: receiving the liquid crystal display a frame data, the frame data includes a plurality of original grayscale codes, and then the original grayscale code is subjected to quantity distribution statistics and numerical operations according to different grayscale values, and then, according to the result of the numerical operation, the original gray is The order code corresponds to a plurality of modified gray scale codes. Finally, the modified gray scale code is transmitted to the liquid crystal display panel to adjust the brightness of the backlight module and the brightness. 'ϋ I Among them, when performing quantity distribution statistics, the statistical results are distributed according to the quantity, and the weighted average gray-scale code is calculated for further analysis and judgment, or the original gray-scale code is taken by bit truncate. The largest significant bit (MSB) to reduce the amount of data to be processed. Wherein, the invention can simultaneously control all the light-emitting elements of the backlight module to perform the light-dark change of the screen, or to control the backlight wedge group to linearly arrange the light-emitting elements to perform the strip-like brightness change of the screen, which is , 7 200837692 By controlling the backlight module, block-like brightness changes are made in block form, 'to achieve the purpose of brightness adjustment of the light control unit. • [Implementation] For a more complete and clear disclosure of the technical content, the purpose of the invention and the effects achieved by this statement, please provide details below, and please refer to the drawings and drawings. : In theory, the optical image data is composed of three colors of RGB (red, green, and blue). The brightness of each color is represented by the gray level, and the value of the mother gray corresponds to one of the gray levels. The code, in this embodiment will be described by the 8-bit gray scale display, that is, the brightness of the brightness will be represented by the total gray scale number of 2 = 256, that is, from white to black. Each grayscale value is represented by a grayscale code from 0 to 255. In general, a liquid crystal display mainly comprises a backlight module and a backlight control unit for controlling the brightness of the moonlight module. The backlight module comprises a light emitting element for providing a light source, and the light emitting element can be a conventional CCFL or LED. Or other suitable illuminating device. Next, referring to FIG. 2, the first embodiment of the present invention is described by using a hardware architecture set on the date of liquid crystal display, and when the liquid a day is displayed, the image is received. The image has more than one frame data, and the frame data will include a plurality of original grayscale codes (c〇de), and the frame data is input to the timing controller and then passed through a brightness calculation unit and 8 200837692 respectively. - (4) Correction unit 12' The luminance calculation unit u will perform a numerical distribution of the original grayscale code 4 (code) according to the difference of the grayscale values, and - judge and numerically calculate according to the statistical result, and then the numerical value As a result of the calculation, the original grayscale code is mapped to a plurality of modified grayscale codes. Then, all the modified grayscale codes are simultaneously transmitted to the data correction unit 12 and the backlight control unit 14 for synchronous adjustment of the data correction unit ι2 and the backlight control unit 14, wherein the data correction unit 12 will correct the grayscale code. Performing a comparison analysis with the original gray-scale code to optimize the image quality, and outputting a plurality of adjusted gray-scale codes to a timing control unit 13, the timing control unit η will adjust the gray scale of the representative frame data. The code and control signals are output to the panel of the liquid crystal display to control the state of the liquid crystal molecules and adjust the brightness of the panel. When the modified grayscale code is transmitted to the backlight control unit 14, the backlight control unit 14 controls the illumination unit of the backlight module through an invener or a drive controller (as indicated by the numeral 15). The brightness, that is, the 2 units are controlled by different modified gray scale codes to present different brightness, especially the gray scale code of the 7C degree of the vehicle 将 darkness will reduce the brightness of the backlight module, thereby saving power consumption. The above redundancy. When the ten-element unit performs the quantity distribution statistics, if it is represented by the bar graph of the graph, as shown in Fig. 3, where the X-axis system represents the gray-scale white code of the 0-255, the Υ-axis indicates that each gray-scale code is The number of the frame data, 9 200837692 can be seen from the number and distribution of the number of grayscale codes, and then can be divided into a number of statistical distribution results weighted average grayscale code for subsequent. Analyze and judge. In addition to direct quantitative analysis, bit truncate can also be used to take the largest significant bit (Msb) of the original grayscale code, thereby reducing the amount of data to be processed, see Figure 4. As shown, we discard a plurality of LSB (Least Significant Bits) data bits and leave a plurality of c MSB (Most Significant Bits) data bits instead of the original gray-scale code. For example, taking MSB 5bits as an example, when grayscale The code has an amount of data of 8 bits (8) and (8). Since the change of the LSB makes the gray-scale code difference of 7 at most, the change of the whole image is not large and the human eye is hard to detect with the naked eye, but the purpose of achieving a large amount of reduced data can be achieved. The data correction unit can correspond to the original gray scale code to the modified gray scale code in various manners. The present invention proposes several of them as an embodiment: Please refer to FIG. 5, which is the corresponding first manner. Let the original ash 6 code be inPut (X axis) 'correct gray scale code as output (Y axis), before making any correction, as shown on the left side of Fig. 5, the input of gray scale code will be equal to tpUt ' Corresponding to a straight line (as indicated by reference numeral 51), the correction is as shown on the right side of Figure 5, wherein when the maximum value of the original grayscale Ma of the frame data is less than 255, the maximum original grayscale code (Max· code) is made. Corresponding to the maximum modified grayscale code, in this embodiment, the maximum modified grayscale code is 255, and the corresponding grayscale code and the modified grayscale code correspond to the following formula: 200837692: Modified grayscale code=original grayscale The code x is more than the gray ash.............(1) The largest original gray code is therefore 'the above formula is presented on the right angle coordinate as shown by the line 52'. However, in order to avoid The maximum original grayscale code is too small and the correction of the grayscale code is meaningless. We will have a minimum gray scale code 53. When the maximum gray scale code is smaller than the lowest gray scale code 53, the lowest gray scale code 53 is the largest original gray code, and the rectangle is displayed on the right angle coordinates. Show the straight line. In addition, the relationship between the original grayscale code and the modified grayscale code may further have the following corresponding embodiments: First, also refer to the right angle coordinate shown on the right side of FIG. 5, when the largest original grayscale code When it is less than 255, take the curve as the label 55. The curve 55 passes the coordinates (〇, 〇) and the coordinates (the largest original gray code (Max. code), the maximum modified gray code), so that the original gray code and correction The corresponding gray scale code satisfies the curve 55 and falls between the two coordinates. The curve of the reference 55 is located on the left side of the line of the reference numeral 52, and even the curve 55 can satisfy the visual response of the human eye to the gray scale brightness and conform to the negative gamma. The relationship 'has a different curve with the largest original grayscale code to satisfy the correspondence between the original grayscale code and the modified grayscale code. As mentioned above, in order to avoid the maximum original gray-scale code being too small, the correction of the gray-scale code is lost. 'The same will be preset" as mentioned above, the lowest-limit gray-scale code 53, so that the maximum original gray-scale code When the minimum-limit grayscale 200837692 code is smaller than the minimum-limit gray-scale code 53 as the largest original gray-scale code, the curve is shown as the reference numeral 56 on the right-angled coordinates. Then, as shown in Figure 6 of the photo, it is the third embodiment of the original gray-scale code and the modified gray-scale code. The difference is the difference between the front-and-real_=·· the passing coordinate (〇,〇) and The coordinate (reference 61 of the largest original gray-scale code (Max. c〇de), taking the large modified gray-scale code) falls on the right-f side of the line 62 of the reference numeral 62, and even the curve 61 can satisfy the gray-scale of the human eye. The visual response of brightness is 4 positive gamma relationship; for the same reason, we can preset a minimum limit gray code 63, so that when the maximum original gray code is less than the minimum gray scale code 63, the minimum salt limit is The gray-scale code 63 is the largest original gray-scale code, which is presented on the right-angled coordinates, and the correspondence between the original gray-scale code and the modified gray-scale code satisfies the curve as indicated by reference numeral 64. Please refer to FIG. 7 , which is a fourth embodiment of the correspondence between the original gray scale code and the modified gray scale code: This embodiment offsets the line equal to input 〇mput (reference 71). That is, as shown by reference numeral 72, the line segment of the portion where the gray-scale code is larger is parallel to the line of the reference numeral 71, and passes through the coordinates (the largest original gray-scale code (Max·c〇de), the maximum corrected gray scale Code), the smaller part of the gray-scale code will be an arc as shown in the enlarged view of Figure 7A and pass the coordinates (〇, 〇). With the difference of the largest original gray-scale code, there are different curves to satisfy the original. The grayscale code corresponds to the modified grayscale code. Similarly, in order to avoid the maximum original grayscale code being too small to affect the grayscale code 12 200837692 correction, this will preset - the lowest limit grayscale code 73, such that the maximum original grayscale code is less than the minimum limit grayscale 7 3 Then, (4) the lowest-limit gray-scale code • 73 is the largest original gray-scale code, and is presented on the right-angled coordinates as shown by the reference numeral 74. Please also refer to FIG. 8 , which is a fifth embodiment of the correspondence between the original gray scale code and the modified gray scale code. The curve (reference numeral 81 ) of this method will pass the coordinates (〇, 〇) and coordinates ( The largest original gray-scale code (Max·c〇de), the maximum repair. The gray-scale code) is different from the previous embodiment in that the curve 81 is S-shaped, that is, the curve 81 is in the region of the larger gray-scale code. The curvature is shifted to the left, and the curvature of the curve 81 in the region of the smaller gray code will be shifted to the right. The gray code correction is performed by the curve, which not only reduces the brightness time, but also reduces the power consumption of the backlight module and enhances the image quality. In addition to the curve of the number 81, other sigmoid curves may be proposed as the correspondence between the original gray scale code and the modified gray scale code through experiments, actual measurements or theories, and the color effect of the face is improved. I Regardless of the above-mentioned method of using the original grayscale code and the modified grayscale code, the jg light control unit will perform brightness reduction or increase according to the modified grayscale code, with the difference of the light emitting components and the brightness control requirement. The brightness adjustment of the backlight control unit can be variously changed as follows: One is to simultaneously control all the light-emitting elements of the backlight module while performing light and dark changes, that is, the change in brightness is the entire panel. The light-emitting elements are arranged in a linear arrangement to change the strips. 13 200837692 For example, a strip-shaped light board composed of LEDs is used as a light-emitting element, and the backlight control unit can respectively control the brightness according to the strip-shaped light boards at different positions, so the panel is controlled. The light and dark are 'striped and changed. The three components cause the light-emitting elements to be block-shaped and changed in a block shape. For example, the light-emitting elements of the backlight module are divided into rectangles, and the backlight control unit independently controls the light-emitting elements in each block, according to each block. The frame data is subjected to brightness control, and the brightness change between the blocks can be changed step by step to avoid excessive brightness difference and being perceived by the human eye. The above-mentioned methods of controlling the intensity have their own advantages and disadvantages, so they can be used in a single use or in combination, but the power consumption of the backlight module can be reduced, and the quality of the kneading image can be improved. Referring to FIG. 9 again, the application of the present invention is presented in a flow chart manner. When the frame data is input (reference numeral 1〇1), the gray scale value quantity distribution statistics of the frame data are performed. 1〇2), then proceed to determine whether it is a static surface (label 103), if it is a static surface, it will continue to maintain the brightness or brightness change time (label 1〇4), and then return to the figure The step of receiving the frame data. The right non-static surface indicates that the surface is different from the previous one, but there is no need to perform backlight dynamic control for each dynamic picture. In this embodiment, the maximum value (Max) and the average value of the original σ gray code are taken. (Ave) mutual judgment comparison (reference numeral 1〇5). If the maximum value is close to or equal to the average value, the change of the frame data 14 200837692 (reference numeral 106) is not performed, and the backlight intensity is maintained at the maximum (reference numeral 1〇7). Then, start receiving the next frame data (reference 1G8) and repeat the previous steps. If the maximum value is greater than the average value, the determination of whether the gray-scale code is corrected (reference numeral 109) is performed. If the maximum original gray-scale code is equal to 255, the gray-scale code correction (label U〇) is not performed, and the backlight intensity is maintained at the maximum (label 111). ), if the maximum original grayscale code is less than 255', then the county grayscale code and the modified grayscale=correspondence_(label 112)' get the corrected grayscale code, and the backlight is corrected by the grayscale code. The strength of the strength (label 13), reduce the backlight, group „ '(4) (four) under the - frame data reception (labels just domain ^ complex ^ step 'however' the above steps or judgments are subject to the technical know-how has the usual knowledge Can be arbitrarily modified and changed, not by this embodiment, ^ results show that 'the dynamic backlight control surface presented by the above method is more = the state of the power consumption can be saved up to 25%, and the image 昼 人 本 W It can achieve the advantages of saving energy, reducing energy consumption, and maintaining the quality of the spirit. It has the advantages of improving the face-to-face ratio, improving the painting, and 乂1; however, the embodiment or figure Show not limiting the invention to Ma Shushun Or public 4, should be corrected to the ratio >, for example, the quantity distribution statistics, the original grayscale code pair from the μ, +, h & horse mode or the brightness control mode of the backlight module, not the above embodiment is适当, # 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 , and the specific methods exposed by it have not been seen in similar products, nor have they been disclosed before the application. Cheng has fully complied with the requirements and requirements of the Patent Law, and has filed an application for invention patents in accordance with the law. And granting a patent, it is really sensible. [Simple diagram of the diagram] / Figure 1: Schematic diagram of the structure of the conventional backlight module. Figure 2: The schematic diagram of the structure of the timing controller of the present invention is shown in Figure 3: The present invention illustrates a schematic diagram of the quantity distribution statistics in a bar graph. FIG. 4 is a schematic diagram showing a bit cutting technique according to the present invention. FIG. 5: The present invention illustrates that the original gray scale code corresponds to one of the modified gray scale codes. Schematic diagram of the embodiment FIG. 6 : The present invention illustrates the original gray scale code corresponding to the modified gray scale code. Another embodiment is not intended. FIG. 7 : The present invention illustrates that the original gray scale code corresponds to the modified gray scale code. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 7A is a partial enlarged view of FIG. 7. FIG. 8 is a schematic view showing still another embodiment of an original gray scale code corresponding to a modified gray scale code. FIG. 9 is a flowchart of an embodiment of the present invention. Fig. 16 200837692 [Description of main component symbols] <The present invention> 1 Timing controller 11 luminance calculation unit 12 Data correction unit 13 Timing control unit 14 Backlight control unit 15 51, 52, 54, 62, 71 53, 63, 73 55,56,61,72,74,81 10Γ 113 <Prior Art> 9 Backlight Module 91 Diffuser 92 Reflector 921 Reflecting Surface 93 94 Strip Light Board 941 LED 942 Strip Plate Inverter or LED Driver Controller Linear Minimum Limit Grayscale Code Curve Flow Chart Step Light Element (CCFL) 17