200903408 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種背光調節 【先前技術】 及其调節方法。 液晶顯示裝置具有輕、薄 被廣泛應用於筆記型f 、耗電少等優點，已 代化資訊設備。通常助… ;:中;吏：’為使應用於設備中之液 更佺，液晶顯示裝置還包括 （置.，，、員不效果 示裝置之背光輝度，進而周即電路，調節液晶顯 往夂門图…進周液曰曰顯示裝置之顯示輝度。 。月“係一種先前技術背光調節電路之 圖。該背光調節電路i句衽— 、口菁忙 mPMw no « b 戒5虎處理模塊120、一訊號 衣杈塊130及—背光調節模塊14〇。 號處理模塊m包括一接收端121。該訊號處理 二 接收端121接受外部輪入之按鍵訊號，將 〆安鍵5虎I化為控制訊號，並輸出至該訊號調製模塊 。3 〇。通常，該按鍵訊號係液晶顯示裝置上之按鍵發出之訊 號，該控職號係對該背光調節電路丨之㈣訊號進行調 製之訊號。 該訊號調製模塊13〇與該訊號處理模塊12〇相連，接 收該訊號處理模塊12〇輸出之控制訊號，且藉由該控制訊 滅對背光之驅動訊號進行脈寬調製（pulse Width Modulation，PWM)，如脈寬展寬或脈寬壓縮，或者對背光 之.驅動訊號進行脈頻調製（pulse Frequency Modulation, 200903408 PFM)調製，如增大脈衝頻 制方彳沾t A 彳脈衝頻率，上述兩種調 衣式句可改變驅動訊號之占空比（Duty)， 该背光調節模塊14〇與該訊號調製 Ρ α = 收該訊號調製模塊130輸出之調節訊；==相連，接 號對背光之輝产谁籽1 ^ 且根據该調節訊 輝度之=度進灯调即’進而實現對液晶顯示裝置顯示 因5亥为光調節電路121内僅具單— 製電路130僅能接受一種η $ 通路，使该訊號調 種凋即汛號，進行—種背氺坰α 士 式’即對背光輝度只能進行大範 “5周即方 高精度之細調。當該背光㈣度之粗調或小範圍 調時’假設每次細調可調節之背光輝度細 二= Mt ’則用戶對該背光輝度進行 至"_η全面調節日寺，需調節3〇〇次 =丁 内貫現大範圍調光。同樣，當該 ：:：曰’ 輝度進行粗調時，假設每次粗調可二光 咖，用戶僅需調節30次，即可實現從_二:度為 圍之輝度調節，然，此種背光 J 0叫範 度小於10mt之較高精度調節。由上 、見精 光調節電路1僅包含一單—通路，刀:° ’因該背200903408 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to backlight adjustment [Prior Art] and its adjustment method. The liquid crystal display device is light and thin. It is widely used in notebooks, and consumes less power. It has become an information device. Usually help... ;:中;吏: 'In order to make the liquid applied to the device more sturdy, the liquid crystal display device also includes (setting,,,,,,,,,,,,,,,,,,,,,,,,,,,夂门图... The display brightness of the liquid 曰曰 display device in the week. “Month” is a diagram of a prior art backlight adjustment circuit. The backlight adjustment circuit i 衽 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 a signal processing block 130 and a backlight adjustment module 14A. The number processing module m includes a receiving end 121. The signal processing two receiving end 121 receives an externally wheeled button signal, and turns the 〆安 key 5 into a control The signal is output to the signal modulation module. 3 〇 Generally, the button signal is a signal sent by a button on the liquid crystal display device, and the control number is a signal for modulating the (4) signal of the backlight adjustment circuit. The modulation module 13A is connected to the signal processing module 12A, receives the control signal outputted by the signal processing module 12, and performs pulse width modulation on the backlight driving signal by the control signal (pulse width modulation) Fluctuation, PWM), such as pulse width broadening or pulse width compression, or pulse frequency modulation (200903408 PFM) modulation of the backlight drive signal, such as increasing the pulse frequency system 彳 t A 彳 pulse frequency, The above two types of styling sentences can change the duty ratio (Duty) of the driving signal, and the backlight adjusting module 14 〇 and the signal modulating Ρ α = receiving the adjusting signal output by the signal modulating module 130; The backlight is produced by the seed 1 ^ and according to the degree of the brightness of the adjustment signal, the light is adjusted, that is, the liquid crystal display device is displayed. Since the light is adjusted, the light-adjusting circuit 121 can only accept a kind of η. $ channel, so that the signal is tuned to the nickname, carry out a kind of 氺坰 氺坰 ' 即 即 即 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光Adjust or small range adjustment time 'Assume that each fine adjustment can adjust the backlight brightness fine 2 = Mt 'The user will adjust the backlight brightness to "_η comprehensive adjustment of the temple, need to adjust 3 times = Ding Range dimming. Also, when:::曰' 辉When the degree is coarsely adjusted, it is assumed that the coarse adjustment can be used for two times. The user only needs to adjust 30 times to realize the brightness adjustment from _2: degree. However, the backlight J 0 is less than 10mt. Higher precision adjustment. From the top, see the fine adjustment circuit 1 only contains a single-path, knife: ° 'Because the back
: 枝纟田财式對背光輝度進行W ::短3攝同時實現大範圍與高精度之 ；：’ 【發明内容】 碎又η周即。 調節:種可對f光輝度進行大範圍高精声 。周即之月先调即電路實為必要。 J旧哎 200903408 3 >接仅 # .' 可對背光輝度進行大範圍高精度綱節之 月先调即方法實為必要。 η即之 光碉節電路，其包括-加法電路及一背光巧r ㈣4加法電路其接收外 號，輸出包含知细R,』 门甙琨及細調訊 塊接收該加法電二於中田调心虎之調節訊號。該背光調節模 背光輝度。 “之•訊號，且根據調節訊號控制 去光5周節方法，其包括以下步驟：步驟-，提供 :;=，接收粗調訊號及細調訊號，輸出-包含= 靡細调訊號之調節訊號；步驟 二=调 該背光調節:路背光輝度。 輸出包含粗調气栌β έ1 Μ卩方法措由该加法電路， & 唬及細5周訊號之調節訊號至背光哨&Ρ 塊’峨調節模塊藉由該調節 :广周即拉 號對背光輝度進行粗 ”訊纽細調訊 高精度之調節。 U ’可實現背光輝度之大範圍 【實施方式] 請參閱圖2，係本發明背光調節電路第一 結構框圖。該背光調節電 1嘹忐戶、&方式之 ,Z包括一訊號處理槿掄？ ί η -粗调訊號產生模塊220 杈塊21〇、 第一積分電路230、H Λ訊號產生模塊221、一 、一加法電路270及^刀電路231、—放大電路 〜α 〇及一月光調節模塊240。 5亥訊號處理模塊210包括一 Ε ^ λ ^ 二輸入端口 212、—第弟—輸入端口扣、一第 #輸出端口 213及—第二輸出端口 8 200903408 214。該第一輸入端口 211接收為該背光調節電路2提供 粗調指令之粗調按鍵訊號。該第二輪入端口 接收 該^光調節電路2提供細調指令之細調按鍵訊號。該訊 號處理模塊210對該-按锤印缺、隹—+ 了邊一杈鍵戒唬進仃處理，分別將粗調 知'鍵sfl 5虎與細調按鍵沖辨娃彳μ i 4 ▲ _ 饮埏汛姽轉化為粗调控制訊號與細調控 制汛唬，最後將該粗調控制訊號藉由該第三端口 213輸 出，將該細調控制訊號藉由該第四端口 214輸出。其中刖 按鍵訊號及該細調按鍵訊號可由該背光調節電路 :外部之控制按鍵發出’亦可由遙控器等遙控裝置發出， 綠周控制訊號及細調控制訊號係對該背光 驅動訊號進行調製之訊號。 电路之 該粗調訊號產生模塊220連接至該第三端〇 21 收該粗調控制訊號。該粗調訊號產生模塊22〇藉 =粗調控制訊號’對驅動背光模組發光之驅動曰訊號$ ::心動訊號轉化為粗調訊號。接著，該粗調訊號產 22〇對粗調訊號進行判斷，以確定其粗調 否起出背光輝度之最大可調範圍，如 疋 則將月光輝度調節至該最大調節範圍之 取大凋即乾圍，則依粗調訊號進行調 230 Λ 將粗調訊號輸出至該第—積分電路 /、中，該粗調訊號為調節背光輝度之數位訊號，节 ::周訊號產生模塊220對驅動訊號之調製方 ： 須调4之方法，改變驅動訊號之占 用脈 来之婶由 、ύ工比。例如需增大背 輝度’則增大驅動訊號之頻率，增大其咖 ’、 tt ? 需 200903408 減小背光輝度’則減小驅動訊號之頻率，減小…比 該細調訊號產生模塊m連接至該第四端〇叫 收该細調控制訊號。該細調訊號產生模塊221藉由接受 :細：控：訊號’對驅動背光模組發光之驅動訊號調 純號轉化為細調訊號1後，該細調訊號產 如對該細調訊號進行判斷，以確定其調節範圍 =達到㈣㈣之調節精度，即粗調訊號之最小調節 :二ί到該粗調訊號之調節精度’則以粗調訊號調 印精度減去細調訊號調節籍降，, 圍，如未達到粗調訊號之a :俨产：周Λ號之调郎範 π # π &之凋即精度，則依細調訊號進行 =讀，該細調訊號產生…21將該細 ==積Γ路231。上述過程中，該細調訊號係調 :月先輝度之數位訊號’該細調訊號產生電路2 =號調製進行脈寬調製，改變驅動訊號之占空比；： =大背光之輝度，則增大驅動訊號之脈寬，即高準位 ，增大其占空比。如需減小背光輝度，則減小驅動 汛唬之脈寬，減小其占空比。 ^動 該第—積分電路230及該第二積分電路231分 ^至該粗調訊號產生模塊220與該細調訊號產生模塊 且進仃對該粗調訊號及細調訊號進行積分平滑作用 出。八刀別轉化為類比細調訊號及類比粗調訊號並輸 該放大電路260連接至該第一積分電路230，接收該 積分f路230 It ϋ之類比粗調訊號’㈣其進行放 10 200903408 大’放大之倍數可㈣實際f要進行 該加法電路270分別連接至 月八度進仃调整。 該放大電路，接收該類比細調訊;= 訊號’對該二訊號進行求和得 =動:路·該背光調整電請藉由 調與細調功能 以輝度進行㈣，同時實現粗 &月光σ周即私路2因採用加法電路 細調訊號求和後之訊鏡：杨虎與 既包含粗調訊息還包含細調：：1使二：調節訊號 π ^ j便该背光項敕帝玫 實現粗調與細镅功^ , 句兀㊈正私路 範圍調節背光輝;二㈣功能可以在短時間内進行大 每 又而、，，田调功能與粗調功能同步進行， 調節背光輝度。因此，該背光調節電路2可在 W内，、現㊉精度與大範圍之背光輝度調節。 =閱圖3’係本發明背光調節電路第二實施方式之 ::框圖。該背光調節電路3與第一實施方 IS?本相同’其區別在於：該背光調節電路3為 二 j Z 光燈（C〇ld Cath〇de Flu〇rescent LamPS，CCFL)之 :光°周即電路’其包括一縮放控制H(Scaler)3l〇、-逆變 及:電源電路320。該縮放控制器310内部集成 么:理模塊（圖未示）、粗調訊號產生模塊（圖未示）與 讯唬產生模塊（圖未示），其還可為該逆變電路340提 ;^通與關閉之控制訊號。胃&變電路340 4乍為該背光 調節電q 北 月光驅動電路，驅動冷陰極螢光燈發光。 11 200903408 該電源電路320兔兮w 為5亥鈿放控制器310及該诵找^ 提供所需之電能。 疋交電路340 該背光調節雷故1 ^ , 兒路3错由加法電路370將相〜 細調訊號求和後，於山a a 卞祖凋訊號及 二咕 輸出包含粗調訊息及細調邙自 —至該逆變電路34〇，使該逆變電路3同:之調節 極螢光燈之發光輝度進行高精度與大範圍之調：對冷陰 請參閱圖4,係本發明背光調節電路第三實^ 結構框圖。該背弁，# 、知方式之 … Λ月九調即電路4與第二實施方式 郎電路3基本相同，Λ 飞之月光調 八丄 门其區別在於：該背光調節電路4在 發光二極體（ughtEmittlngD喊⑽^路= 路’其包括—LED驅動電路44〇。該咖驅動 取代遑逆變電路340，驅動發光二極體發光。 該背光調節電路4藉由加法電路47〇將粗調訊㈣ 細5周訊號求和’得到調節訊號，言亥LED驅動電路_接 收該包含粗調與細調訊息之調節訊號，可實現對發光二 極體進行大範圍與高精度之輝度調節。 一請參閱圖5，係本發明背光調節方法之流程圖。該背 光調節方法以該背光調節電路2為例進行描述，其包括 以下步驟： 步驟101，接收外部訊號，並輸出控制訊號； 5亥訊號處理模塊210接收外部輸入之粗調按鍵訊號 及細調按鍵訊號，且對二訊號進行處理，分別得到粗調 控制訊號及細調控制訊號，並將二控制訊號輸出。 步驟102 ’產生並輸出粗調訊號與細調訊號； 12 200903408 提供一粗調訊號產生模塊220接收該粗調控制訊 號，藉由該粗調控制訊號對驅動背光驅動訊號進行脈頻 調製’改變驅動訊號之占空比，“得到數位之粗調訊 號。占空比大對應之背光輝度大，占空比小對應之背光 輝度小。接著，該粗調訊號產生模塊22〇對粗調訊號進 行2斷，以確定其粗調範圍是否超出背光輝度之最大可 :周範圍，如超出背光輝度最大調節範圍則將背光輝度調 :至背光輝度最大調節範圍之上限，如未超出最大調節 範圍貝j依粗5周5孔號進行調節。ϋ，該步且調訊號產生 電路220將粗調訊號輸出。 X、’田凋Λ號產生模塊221接收該細調控制訊號，藉 由該細調控制訊號對驅動背光驅動訊號進行脈寬調製， 改變該背光驅動訊號之高準位時間，進而改變該驅動訊 唬之占空比，將其調製為數位之細調訊號。占空比大對 應之背光輝度大，占空比小對應之背光輝度小。然後， 该細調訊號產生模塊221對該細調訊號進行判斷，以確 ，其，節範圍是否達到粗調訊號之調節精纟，即粗調訊 唬之取小调郎範圍，如達到該粗調訊號之調節精度，則 从粗凋汛號調節精度減去細調訊號調節精度， ，號之調節範圍’如未達到粗調訊號之調節精度為則： 二凋讯號進行調節。最後，該細調訊號產生電路 该細調訊號輪出。 、 和，：!：訊接號收粗調訊號與細調訊號’並進行積分求 13 200903408 Λ第積分電路220接收該粗調，廿 訊號進行積分，得到類比之粗調訊二 路26〇之放大作用後輸出至該加法電路2、;：=:電 260對粗調訊號之放大倍數可根 = 度確定’精度越小，放大倍數越大。粗m周即精 訊號==231#收該細調訊號，並對該細詞 节 I到痛比之細調訊號，輸出至該加法電路270。 求和，輸出調節訊號。 m虎及HfU虎進行 步=104 ’根據調節訊號，調節背光輝度； 。亥月光調節模塊240接收兮嘴…。占,, 調節訊號對背井、二J :周即訊唬’然後藉由該 柏 订。周即，使传背光達到所需之輝度。 細調訊號進;I術，Ϊ背光調節方法對該粗調訊號及該 節訊號广該和」得到包含粗調訊息及細調訊息之調 現背光輝度1粗240 #由該調節訊號可同時實 度調節，^ 即可實現短時間大㈣之輝 即北问&亦可實現高精度之輝度調節。 用於僅適用於背光調節電路2,其亦適 背光式之背光調節電路3與第四實施方式之 綜上所述 專利申請。惟 本發明之範圍 技藝之人士， ’本發明符合發明專利要件，爰依法提出 ，、以上所述者僅為本發明之較佳實施方式， 並不以上述實施方式為R，舉凡熟悉本案 在援依本案發明精神所作之等效修飾或變 14 細調訊號產生模塊 第二積分電路 加法電路 270、370 電源電路 縮放控制器 200903408 化’皆應包含於以下申士支 【圖式簡單說明】，專利範圍A。 圖1係一種先前技術 圖2係本發明背光調節=電：之結構框圖。 圖3係本發明背光調節電路第二之結構框 圖4係本發明背光調節電路第三‘二之結構框 ^係本發明背光調節方法之;;程圖。式之結構框 【主要元件符號說明】 背光調節電路 7 α 此， 2、3、4訊號處理模塊 背光調節模塊 240 ，路 340第三端口 弟一端口 212第四端口 221粗調訊號產生模塊 231第一積分電路 470放大電路 320 LED驅動電路 310、410 210 211 213 214 220 230 260 440 15: The branch of the financial formula for the backlight brightness W: short 3 shots while achieving a wide range and high precision;:' [invention content] broken and η weeks. Adjustment: The species can perform a wide range of high-precision sound for f-light. It is necessary to adjust the circuit first. J old 哎 200903408 3 > Then only # . ' It is necessary to adjust the backlight brightness to a large range of high-precision sections. η 之 碉 电路 , , , , , , , , , , , η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η η Tiger's adjustment signal. The backlight adjusts the backlight brightness of the mode. "The signal, and according to the adjustment signal control light removal 5 week method, including the following steps: Step -, provide:; =, receive coarse signal and fine signal, output - contains = 调节 fine signal adjustment signal Step 2 = adjust the backlight adjustment: road backlight brightness. The output contains coarse adjustment gas 栌 β έ 1 Μ卩 method by the addition circuit, & 唬 and fine 5 weeks signal adjustment signal to the backlight whistle & Ρ block '峨The adjustment module adjusts the high precision of the backlight brightness by using the adjustment: the wide-circle and the pull number. U ′ can realize a wide range of backlight luminance. [Embodiment] Please refer to FIG. 2 , which is a first structural block diagram of a backlight adjustment circuit of the present invention. The backlight adjusts the electricity, and the Z includes a signal processing method. ί η - coarse adjustment signal generation module 220 〇 block 21 〇, first integration circuit 230, H Λ signal generation module 221, one, one addition circuit 270 and ^ knife circuit 231, - amplification circuit ~ α 〇 and January light adjustment module 240. The 5th signal processing module 210 includes a Ε ^ λ ^ two input port 212, a first input port latch, an ## output port 213, and a second output port 8 200903408 214. The first input port 211 receives a coarse key signal for providing a coarse adjustment command to the backlight adjustment circuit 2. The second wheel-in port receives the fine-tuning button signal of the fine-tuning command provided by the light-adjusting circuit 2. The signal processing module 210 processes the hammer-printing defect, the 隹-+ edge, the 杈 key, or the , , , , ' ' 键 键 键 s s 虎 虎 虎 虎 虎 虎 虎 虎 虎 虎 虎 虎 虎 虎 i i i i i i i i The beverage control is converted into a coarse control signal and a fine control signal. Finally, the coarse control signal is output through the third port 213, and the fine control signal is output through the fourth port 214. The button signal and the fine button signal can be output by the backlight adjustment circuit: an external control button can be sent by a remote controller such as a remote controller, and the green week control signal and the fine control signal are signals for modulating the backlight driving signal. . The coarse signal generating module 220 of the circuit is connected to the third terminal 21 to receive the coarse control signal. The coarse signal generation module 22 uses the = coarse control signal to convert the driving signal of the driving backlight module into a coarse signal. Then, the coarse adjustment signal produces 22 〇 to judge the coarse adjustment signal to determine whether the coarse adjustment has the maximum adjustable range of the backlight luminance, and if the 疋, the moonlight luminance is adjusted to the maximum adjustment range. The adjustment signal is adjusted according to the coarse adjustment signal. Λ The coarse adjustment signal is output to the first integration circuit/, and the coarse adjustment signal is a digital signal for adjusting the backlight luminance. Section: The weekly signal generation module 220 drives the signal. Modulation side: The method of adjusting 4 is needed to change the occupation ratio of the driving signal. For example, if you need to increase the back luminance, increase the frequency of the driving signal, increase its coffee', tt? Require 200903408 to reduce the backlight brightness' to reduce the frequency of the driving signal, reduce... connect to the fine signal generating module m The fourth end is called to receive the fine control signal. The fine-tuning signal generating module 221 determines the fine-tuning signal by accepting: fine: control: the signal 'the driving signal of the driving backlight module is converted into the fine-tuning signal 1 To determine its adjustment range = reach the adjustment accuracy of (4) (four), that is, the minimum adjustment of the coarse adjustment signal: the adjustment accuracy of the two-to-coarse signal is adjusted by the coarse adjustment signal minus the fine adjustment signal, If the coarse signal is not reached, a: 俨 : : Λ Λ π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π π = accumulation road 231. In the above process, the fine-tuning signal is adjusted: the digital signal of the first-degree luminance is 'the fine-tuning signal generating circuit 2 = the number modulation is pulse-width modulated, and the duty ratio of the driving signal is changed;: = the brightness of the large backlight is increased The pulse width of the large drive signal, that is, the high level, increases its duty cycle. To reduce the backlight brightness, reduce the pulse width of the drive , and reduce its duty cycle. The first integration circuit 230 and the second integration circuit 231 are divided into the coarse adjustment signal generation module 220 and the fine adjustment signal generation module, and the integration of the coarse adjustment signal and the fine adjustment signal is smoothed out. The eight-knife is converted into an analog fine-tuning signal and an analog coarse-tuning signal, and the amplifying circuit 260 is connected to the first integrating circuit 230, and receives the analog f-channel 230 It ϋ analogy of the coarse-tuning signal '(4), which is carried out 10 200903408 The multiple of the magnification can be (4) the actual f is to be performed by the addition circuit 270 to be connected to the monthly octave adjustment. The amplifying circuit receives the analog fine tuning; = the signal 'summation of the two signals==moving: the roadside adjustment power is performed by adjusting the fine adjustment function with brightness (4), and simultaneously implementing the coarse & moonlight σ 即 即 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 私 杨 杨 杨 杨 杨 杨 杨 杨Realize the coarse adjustment and fine work ^, the sentence 兀 正 正 私 私 调节 调节 调节 调节 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Therefore, the backlight adjustment circuit 2 can adjust the backlight luminance within W, the current ten precision and a wide range. = Figure 3 is a block diagram of a second embodiment of the backlight adjustment circuit of the present invention. The backlight adjustment circuit 3 is the same as the first embodiment IS. The difference is that the backlight adjustment circuit 3 is a C 〇 C C 〇 〇 〇 〇 CC CC CC (CCFL): The circuit 'includes a scaling control H (Scaler) 3l, - inverter and: power supply circuit 320. The scaling controller 310 is internally integrated: a management module (not shown), a coarse signal generation module (not shown), and a signal generation module (not shown), which may also be provided for the inverter circuit 340; Control signal for switching on and off. The stomach & change circuit 340 4 乍 is the backlight adjustment electric q north moonlight drive circuit, driving the cold cathode fluorescent lamp to emit light. 11 200903408 The power circuit 320 provides the required power for the 5 钿 控制器 controller 310 and the 诵 ^. The back-up circuit 340 adjusts the lightning 1 ^ , and the child 3 is wrongly summed by the adding circuit 370 to sum the fine-tuned signals, and the mountain aa ancestor signal and the second-order output contain coarse information and fine tuning - to the inverter circuit 34 〇, the inverter circuit 3 is the same as: the brightness of the illuminating lamp of the illuminating lamp is highly accurate and wide-range: for the cold, please refer to FIG. 4, which is the backlight adjusting circuit of the present invention. Three real ^ structure block diagram. The back 弁, #, know the way... The Λ月九调, that is, the circuit 4 is basically the same as the second embodiment lang circuit 3, and the difference is that the backlight adjustment circuit 4 is in the light-emitting diode (ughtEmittlngD shout (10) ^ road = road 'which includes - LED drive circuit 44 〇. The coffee driver replaces the 遑 inverter circuit 340, driving the light-emitting diode to emit light. The backlight adjustment circuit 4 through the addition circuit 47 〇 coarse adjustment (4) Fine 5 weeks signal summation 'Get the adjustment signal, Yanhai LED driver circuit _ Receive the adjustment signal including coarse and fine adjustment information, which can realize the wide range and high precision brightness adjustment of the LED. 5 is a flowchart of a backlight adjustment method according to the present invention. The backlight adjustment method is described by taking the backlight adjustment circuit 2 as an example, and includes the following steps: Step 101: Receive an external signal, and output a control signal; The module 210 receives the externally input coarse adjustment button signal and the fine adjustment button signal, and processes the two signals to obtain the coarse control signal and the fine control signal respectively, and the two control signals are input. Step 102 'generate and output a coarse adjustment signal and a fine adjustment signal; 12 200903408 provides a coarse adjustment signal generation module 220 to receive the coarse adjustment control signal, and perform pulse frequency modulation on the driving backlight driving signal by the coarse adjustment control signal. The duty ratio of the driving signal, "get the digital coarse signal. The backlight has a large backlight brightness, and the small duty ratio corresponds to a small backlight brightness. Then, the coarse signal generating module 22 〇 performs the coarse adjustment signal. 2 break to determine whether the coarse adjustment range exceeds the maximum brightness of the backlight: the range of the circumference, if the maximum adjustment range of the backlight brightness is exceeded, the backlight brightness is adjusted: to the upper limit of the maximum adjustment range of the backlight brightness, if the maximum adjustment range is not exceeded. The adjustment is performed according to the 5th hole number of the 5th week. In this step, the adjustment signal generation circuit 220 outputs the coarse adjustment signal. X, 'Tianfu number generation module 221 receives the fine control signal, and the fine control signal is controlled by the fine adjustment Pulse-width modulating the driving backlight driving signal, changing the high-level time of the backlight driving signal, thereby changing the duty ratio of the driving signal, and modulating it into a number The fine adjustment signal has a large backlight with a large backlight brightness, and the small duty ratio corresponds to a small backlight luminance. Then, the fine signal generation module 221 determines the fine adjustment signal to determine whether the range is To achieve the fine adjustment of the coarse adjustment signal, that is, the coarse adjustment signal is used to take the small adjustment range. If the adjustment precision of the coarse adjustment signal is reached, the adjustment precision of the fine adjustment signal is subtracted from the adjustment precision of the coarse adjustment signal. If the range 'has not reached the adjustment precision of the coarse adjustment signal: then the two signals are adjusted. Finally, the fine signal generation circuit rotates the fine signal. , , , :!: The signal number receives the coarse signal and Fine-tuning the signal 'and performing the integral search 13 200903408 Λ The first integration circuit 220 receives the coarse adjustment, and the signal is integrated to obtain an analogy of the coarse adjustment signal 26 〇 amplification and output to the addition circuit 2;;:=: The amplification factor of the electric 260 to the coarse adjustment signal can be determined as the root degree = the smaller the precision, the larger the magnification. The coarse m-week, that is, the fine signal==231#, receives the fine-tuned signal, and outputs the fine-tuned signal to the pain ratio to the addition circuit 270. Summation, output adjustment signal. m tiger and HfU tiger proceed step = 104 ’ according to the adjustment signal, adjust the backlight brightness; The moonlight adjustment module 240 receives the poop... Occupy, adjust the signal to the back of the well, the second J: the week is the news 唬' and then by the bai. Week, the backlight is brought to the desired brightness. Fine-tuning the signal; I, Ϊ backlight adjustment method to the coarse signal and the section of the signal to sum the "received the coarse-grained message and the fine-tuned message to achieve the backlight brightness 1 thick 240 # by the adjustment signal can be simultaneously Degree adjustment, ^ can achieve a short time (four), that is, North question & can also achieve high-precision brightness adjustment. It is intended to be applied only to the backlight adjustment circuit 2, which is also suitable for the backlight type backlight adjustment circuit 3 and the fourth embodiment. However, the person skilled in the art of the scope of the invention, 'the invention meets the requirements of the invention patent, and is proposed according to the law, and the above is only the preferred embodiment of the invention, and is not R in the above embodiment, and is familiar with the case. Equivalent modification or modification according to the spirit of the invention 14 fine adjustment signal generation module second integration circuit addition circuit 270, 370 power circuit scaling controller 200903408 "all should be included in the following Shen Shizhi [schematic description], patent Range A. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a prior art Fig. 2 is a block diagram showing the structure of backlight adjustment = electricity: according to the present invention. 3 is a structural block diagram of a backlight adjustment circuit of the present invention. FIG. 4 is a third embodiment of the backlight adjustment circuit of the present invention. Structure frame [main component symbol description] backlight adjustment circuit 7 α, 2, 3, 4 signal processing module backlight adjustment module 240, road 340 third port brother one port 212 fourth port 221 coarse adjustment signal generation module 231 An integrating circuit 470 amplifying circuit 320 LED driving circuit 310, 410 210 211 213 214 220 230 260 440 15