201106785 六、發明說明： 【發明所屬之技術領域】 本發明係指一種調光控制方法及其相關發光裝置，尤指一種可 於同頻時提供穩定驅動電流之調光控财法及其細發光裝置。 【先前技術】 以發光二極體（LightEmittingDi〇de，LED)作為發光源的應用 越來越普遍，例如液晶顯㈣、行動電話、可攜錢職個人數位 助理等的躲背光模組。f光模組是顯示器中驅動光源的關鍵零組 件’其不但決定了顯示H之可#度及敎度，更直接影響到顯示器 的顯像品質。 叙來說，為了讓使用者能依照喜好來調整光源亮度或是於環 境亮度之允許下能節省更多電力，必須擁有良好的調光功能。以發 先-極體之物理特性來看，通過發光二極體之電流與發光二極體之 順向偏壓呈驗義，喊光二鋪之發紐朗麵駐本身之 電流成正比。換句話說，#通電流献 * 度也隨之越高。常見_光方式有類比贱方式與數_式冗 類比調光方式是藉由嫌流過發光二極_順向錢別、先$到 π度變化。數位調光方式是對發光二極體進行明滅的控制，並利用 201106785 人眼視覺暫留的現象’經由改變201106785 VI. Description of the Invention: [Technical Field] The present invention relates to a dimming control method and related illuminating device, and more particularly to a dimming control method and a fine illuminating method capable of providing stable driving current at the same frequency Device. [Prior Art] The application of Light Emitting Diodes (LEDs) as a light source is becoming more and more popular, such as liquid crystal display (4), mobile phones, and portable digital assistants. The f-light module is the key component of the driving light source in the display. It not only determines the degree and brightness of the display H, but also directly affects the display quality of the display. In order to allow the user to adjust the brightness of the light source according to his preference or to save more power under the permission of the ambient brightness, he must have a good dimming function. In terms of the physical properties of the first-pole body, the current through the light-emitting diode and the forward bias of the light-emitting diode are inductive, and the current of the new light-emitting surface of the second light is proportional to the current. In other words, the #通电流献 degree is also higher. Common _ light mode has analogy 与 mode and number _ mode verboid analog dimming mode is by sinus flow through the illuminating dipole _ forward money, first $ to π degree change. The digital dimming method is to control the light-emitting diodes and use the 201106785 phenomenon of human vision persistence.
Cyde)，來進行平均亮度的；'極體月滅的工作週期（Duty …、 的控制_類比調光方式，'雖铁竇㈣ 早’_加外部電路，而增添了系統的成本。因此， 展趨勢便以數位方式調光為主。 ，，x -月參考第1目’第1圖為習知—數位調光控概置之 ^數侧_齡10 _卜料耕_彳_程序、「其 匕s有一電壓轉換器102、-回授單元104、一脈波調變控制單元 伽’運作方式如下。脈波調變控制單元106根據一調光控制訊號 s麵、-參考電壓Vref與取自於回授單元撕之一回授電壓I， 產生-脈波控制訊號s陋，以控制電壓轉換器⑽將—輸入電^ VlN轉換成—輸出骑賴Vd。如此—來，透過脈波糊訊號 控制輸出驅動電壓VD’進而控制流經發光元件1〇〇之輸出驅動電流 Iled的平均量’以達調光的目的。 j而為了避免啟始時的大電流效應，數位調光控制裝置1 〇 通常會輔以實施軟啟動（soft start)功能來解決大電流效應。如此一 來’雖可大幅降低大電流效應，但仍會產生突波電流（inrush current) 現象而影響調光程序。第2圖及第3圖分別為習知調光控制訊號SmM 在低頻與高頻時，理想輸出驅動電流Iideal與實際輸出驅動電流Iled 之示思圖，其中陰影處表示平均輸出驅動電流大小。如第2圖所示， 调光控制訊號SDIM為低頻且工作週期為50%，實際的輸出驅動電流 Iled導通時會有一上升時間ti及一下降時間t2。由於軟啟動程序的 201106785 進4丁使Η·上升時間tl蝴會有―短暫的電流突波效應。在此 下’由於低頻時，導通時間較長，因此於上升時mi與下降時m2 期間所存在之誤差，姆之下較無·，捕是說，縣Cyde), to perform the average brightness; 'the duty cycle of the polar body moon (Duty ..., the control _ analog dimming mode, 'though the iron sinus (four) early '_ plus external circuits, which adds to the cost of the system. Therefore, The trend of the exhibition is mainly digitally dimmed. ,, x - month reference to the first item 'the first picture is the conventional - digital dimming control overview of the number side _ age 10 _ _ _ _ _ _ program, The operation mode of the voltage converter 102, the feedback unit 104, and the pulse modulation control unit is as follows. The pulse modulation control unit 106 is based on a dimming control signal s surface, a reference voltage Vref and Taking the feedback voltage I from the feedback unit to generate a pulse-wave control signal s陋, the control voltage converter (10) converts the input voltage VlN into an output-output Vd. Thus, the pulse wave is transmitted through the pulse wave. The paste signal controls the output drive voltage VD' to control the average amount of the output drive current Iled flowing through the light-emitting element 1' to achieve the purpose of dimming. j. In order to avoid the large current effect at the start, the digital dimming control device 1 〇 is usually supplemented by the implementation of the soft start function to solve the big power The flow effect. As a result, although the large current effect can be greatly reduced, the inrush current phenomenon still occurs and the dimming process is affected. Figures 2 and 3 show the conventional dimming control signal SmM at At low frequency and high frequency, the ideal output drive current Iideal and the actual output drive current Iled are shown in the figure, where the shaded area represents the average output drive current. As shown in Figure 2, the dimming control signal SDIM is low frequency and the duty cycle is 50%, the actual output drive current Iled will have a rise time ti and a fall time t2 when it is turned on. Since the soft start program of 201106785 enters 4, the rise time tl butterfly will have a short-lived current surge effect. Under the 'low frequency, the conduction time is longer, so the error in the period of m and the m2 during the rise is less than that under the m.
平均輸出軸電流大小（第2财之陰购撼棒反觀= 圖中《舰㈣賴；s_為高頻且I作聊為郷時，導 ==此於上升BUU1與下料_輔在之誤㈠ ^付非承重要。如第3圖所示，理想與實際之平均輸出驅動電产大 小，將會因軟啟動程序而影響更大比例的導通時間 L H均亮度的變化不如職。請繼續參考第4圖及第5^ . 圖及第5圖為習知調光控制訊號s_在高頻且工作週期分The average output shaft current size (the second fiscal yin purchase 撼 反 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Mistakes (1) ^Payment is important. As shown in Figure 3, the average output of the ideal and actual output drives the size of the electricity, which will affect the greater proportion of the on-time LH brightness due to the soft start procedure. Refer to Figure 4 and Figure 5 and Figure 5 for the conventional dimming control signal s_ at high frequency and duty cycle
二理ί輸出驅動電流與實際輸出驅動電流“· 二=平均輸出驅動電流大小。如第4圖所示，於I =:=^^rr 下降 _ 尚未降至理想值時即已結束，而進入下一個週期二：’電： :將造成流經發光元請之驅動辑二《 冗度不均，並且會產生音雜訊。 ^住以及 【發明内容】 裝 因此，本發明之主要在於提供一 置，以解決上述問題。 種調光控财法及其相 關發光 201106785 本發明揭露-種用於-發光裝置之調光控制方法，包含有该測 -控制訊號’並制該控伽號之鮮；根_控娜號之頻率， 產生-致能職並輸驗控舰號之—工作湖；以及於該控制訊 號之頻率大於或等於-檢測頻率時，根據該控制訊號之工作週期及 一參考電壓，產生一調光控制電壓，以進行調光程序。 本發明另揭露一種具調光控制之發光裝置，包含有一電壓轉換 籲斋、-發光光源模組、-回授單元、一脈波調變控制單元、一調光 檢測單元以及-訊號合成單元。該電壓轉換器，用來根據一脈波控 制訊被，將-輸入電轉換成一輸出驅動電壓。該發光光源模組， 輕接於該電屋轉換器。該回授單元，輕接於該發光光源模組，用來 產生-回授電壓。該脈波調變控制單元，躺接於該發光光源模組、 該回授單凡與該電塵轉換器，用來根據該回授電壓及一調光控制電 麗’產生該錢㈣贿至該賴轉鋪，雜繼賴轉換器轉 鲁換出。亥輸出驅動電塵。該調光檢測單元’躺接於該脈波調變控制單 1用來制-控制訊號，並檢職控制訊狀鮮，以產生—致 ，訊:虎與輸出該㈣訊號之—卫作週期。該訊號合成單元，輕接於 該調光檢測單元與該脈波機控制單元，用來根據制訊號之工 作週期及-參考紐，產钱調光控制賴，以做波調變控制單 疋據以控制該電壓轉換器轉換出對應之該輸出驅動電壓，進 光之目的。 @ 【實施方式】 201106785 明參考第6圖’第6圖為本發明實施例具調光控制之發絲置 60之示意圖。發光裝置60包含有一電壓轉換器6〇2、一發光光源模 組604、-回授單元606、-脈波調變控制單元_、一調光檢測單 元610及-訊號合成單元612。電壓轉換器6〇2絲根據一脈波控 制訊號sPWM ’將-輸入電壓Vin轉換成一輸出驅動電壓％，並將 輸出驅動 VD提供至發絲雜關4。單元_麵接於發 光光源模組604 ’用來產生—回授電壓&。脈波調變控制單元6〇8 麵接於發光光麵組604、回授單元_與電雜換器，用來根 據回授電壓VFBA-_控财壓v_，產生脈波㈣訊號知觀 至電壓轉換器6G2，以控制電壓轉換器6()2轉換出適當之輸出驅動 電壓VD。調光檢測單元610耗接於脈波調變控制單元議，用來偵 測-控制訊號Sc，並檢測控制訊號^之頻率，以產生一_訊號 ^與輸出控制訊號Sc之一工作週期D。訊號合成單元612耦接^ 调光檢測單元㈣與脈波調·制單元_，用來根據控制訊號& 之工作週期D及-參考電壓Vr£f ’產生調光㈣龍，以供 脈波調變控制單元6〇8據以控制電壓轉換器轉換出對應之輸出 驅動電壓vD ’進而控制流經發光光源模組_之輸&驅動電流1 Iled ’以達調光之目的。 簡單來說，本發明係透過調光檢測單元61〇來判斷是否進行調 光私序。當調光檢測單元61〇制到控制訊號心，並檢測出控制訊 破Sc之頻率大於或料-制鮮&满，調光制單元⑽進— 201106785 步產生致能訊號sg脈波調變控制單元⑽，以控制脈波調變抑 制料_停止執行—軟啟動程序，並輸出㈣訊號&之工作週期 D至訊號合成單元612，以產生調光控制電壓％。此外，當調光 檢測單:⑽檢測出控制訊號Sc之頻率小於—檢測頻率^時，調 光仏測單7L 610產生致能訊號Sen至脈波調變控制單元6⑽，以杵 制脈波控鮮元_停止發_㈣之運作猶之，於概 檢測單兀6Π)檢測出控制訊號Sc之頻率大於或等於一檢測頻率。 時，發光裝置60即進入調光模式運作。 進一步說明，當發光裝置60進入調光模式時，調光檢測單元 610會將控制訊號Sc之工作週期D的資訊傳送至訊號合成單元 612。請參考第7圖’第7圖為第6圖中訊號合成單元612之示意圖。 訊號合成單元612包含有-訊號產生單元7〇2及一低通紐單元 7〇4。訊號產生單元7〇2祕於調光檢測單元_，用來根據控制訊 號Sc之作職D及參考糕％，產生—調絲號s。低通滤 波單元704耦接於訊號產生單元7〇2，用來濾除調光訊號s之高頻 部分，以產生低頻直流部份之調光控制電壓Vdim。較佳地，訊號產 生單元702可將控制訊號sc之工作週期d與參考電壓相乘Vref， 來產生調光訊號S。在此情況下，若控制訊號Sc之頻率為低頻時， 調光訊號S經過低通濾波單元704後，所產生之調光控制電壓Vdim 為數位形式，保有控制訊號sc之低頻成分。同理，若控制訊號sc 之頻率為高頻時，調光訊號s經過低通濾波單元704後，會遽除調 光訊號s之咼頻部分，而產生低頻直流部份之調光控制電麗vDlM。 201106785 換句如，喊Se之辭顧_，細触侃之調光控 制電麗V腦，進行調光_。若控制訊號Sc之頻率為高頻時，調 光訊號S通過低通舰單元7〇4後，會變成類比直流形式之調光控 制電歷V函，來進行調光控制。第8圖及第9圖分別為本發明實施 例控制訊號在低頻與高頻時，理想輸細動電流Iideal與實際輸出 驅動電流ILED之示意圖。由第8圖及第9圖可以看出，不管是低頻 或疋间頻時實際通過發光光源模組604之輸出驅動電流^幾乎 ^因此’本發明透過調光檢測單元610檢測控制訊號Sc ，判斷出 肩光拉式後糊訊號合成單元612產生調光控制電壓乂函，使脈 波調變控鮮元608據以控制電壓機器6〇2產生輸出驅動電墨 VD，以改變平均流過發光光源模組_之輸出驅動電流ILED大小， 進而達到發光光源模組’的平均亮度控制。如此一來，相較於習 知技術’本發财但可於高頻或低頻時產生鮮且穩定的轉電流 來進行調紐序，亦可有效抑制音雜訊的產生。 關於發光裝£ 60的詳細操作方式，請繼續參考以下說明。第 10圖為本發明實施例一流程1000之流程圖。流程讎用以實現發 光裝置60之調絲序。流程1000包含下列步驟： 步驟1002 :開始。 V驟1004 ·偵測控制訊號Sc，並檢測控制訊號心之頻率。 ，驟006 .根據控制訊號心之頻率，產生致能訊號^ΕΝ並輪出 201106785 控制訊號sc之工作週期D。 步驟難於控制城SC之頻率大於或等於一檢測頻率。時， 根據控制減Se之卫作棚D及參考麵v赃，產生 調光控制電壓ν_ ’以進行調光程序。 步驟1010 :結束。 流程麵伽以綱發歧㈣的運作方式，詳細說明及相 關變化可參考前述說明，在此不贅述。 要注意的是，發絲置60係為本翻之—實_，本領域且通 常知識者當可據以做不同之變化，而不限於此。舉例來說，發光光 源模組204可包含複數個並聯之發光二極體串％，但不以此祕， 亦可僅有-個發光二極體串列。另—方面，由於發光二極體係為一 電流驅動元件，其發光亮度與驅動電流大小成正比，亦即，驅 =光二極體的發光亮度也就越大。-般而言，為求流經 各發光-極體之電流相同來達到相同亮度的要求，因此，在本實施 ^中每—發光二極體串列包含有相_並以串聯 =體’但發光二極體串列縣偈限於複數個串接的發光二極 光二極體串列亦可僅包含單—發光二極體。此外， 由於人類肉眼無法察覺的頻率極限約介於6〇至職ζ之間，因此， ^測頻率fdet紐地可奴為介於6G至應出之 是說’可確保依據控制訊號Sc所進行的調光程序，在控制發值光= 體開啟_之時的崎變化，不會被眼睛察覺出來。X 一 201106785 、’'T、上所述，相較於先前技術，本發明實施例在各頻率範圍内實 是调光私序時’不會因突波效應而產生非理想之驅動電流ILED，導 致調光效果;ί；佳。本獅透過調光制單元_，觸$調光模式 後’=利用訊號合成單元612產生調光控制電壓v_，使脈波調變 控制早7〇6〇8據以控制電壓轉換器6〇2產生輸出驅動電壓％，以改 變平均流過發光光源 604之輸出驅動電流lLED大小，進而達到 發光光源麵_的平均亮度控制。域—來，本發日胳高頻或是 低頻時’皆可產生精準且敎的鶴電流來簡程序，亦可 效抑制音頻雜訊的產生。 以上所述僅為本發明之較佳實施例，凡依本發 所做之均_雜飾，_本㈣之涵蓋翻。她圍 【圖式簡單說明】 第1圖為習知-數位調光控制裝置之示意圖。 第2圖為習知調光控制訊號在低頻時 輸出驅_流之移圖。 财‘轉電流與實際 第3圖為習知調綠制訊號在高頻時，理想輪出 輪出驅動電流之示意圖。 ％/爪與只際 第4圖為習知調光控制訊號在高頻且工 出驅動電流與實際輸出麟電流之示意圖。’、’、/β時’理想輸 201106785 第5圖為習知調光控制訊號在高頻且工作週期為％。 輸出驅動電流與實際輸出驅動電流之示意圖。 5/。時，理想 第6圖為本發明實施例具調光控制之發光裝置之示音圖。 第7圖為第6圖中訊號合成單元之示意圖。 第8圖為本發明實施例控制訊號在低頻時，理想如驅動電流與 實際輸出驅動電流之示意圖。Secondly, the output drive current and the actual output drive current "· two = average output drive current size. As shown in Figure 4, when I =:=^^rr falls _ has not yet fallen to the ideal value, it has ended, and entered The next cycle 2: 'Electric:: will cause the flow through the illuminating element please drive the second series of "unevenness, and will produce sound noise. ^ live and [invention content] installed, therefore, the main purpose of the present invention is to provide a The present invention discloses a dimming control method for a light-emitting device, including the test-control signal and making the control gamma ; the frequency of the root _ control number, the generation - the ability to operate and control the ship number - the working lake; and when the frequency of the control signal is greater than or equal to - the detection frequency, according to the duty cycle of the control signal and a reference The voltage generates a dimming control voltage for performing a dimming process. The invention further discloses a light-emitting device with dimming control, comprising a voltage conversion, a light source module, a feedback unit, and a pulse wave modulation Variable control unit a dimming detecting unit and a signal synthesizing unit, wherein the voltage converter is configured to convert the input electric power into an output driving voltage according to a pulse control signal. The light emitting light source module is lightly connected to the electric house converter The feedback unit is lightly connected to the illuminating light source module for generating a feedback voltage. The pulse wave modulation control unit is connected to the illuminating light source module, the feedback unit and the electric dust conversion According to the feedback voltage and a dimming control, the electrician generates the money (four) bribes to the Laipu shop, and the hybrid relay converter converts the Lu. The output of the diversion drive drive dust. The dimming detection unit' Lying in the pulse wave modulation control unit 1 is used to control the signal, and the inspector control signal is fresh, to generate a signal, the signal: the tiger and the output of the (four) signal - the guard cycle. The signal synthesis unit, Lightly connected to the dimming detecting unit and the pulse wave machine control unit for controlling the voltage conversion according to the duty cycle of the signal signal and the reference signal, and the wave modulation control unit is controlled according to the wave modulation control unit The converter converts the corresponding output driving voltage for the purpose of entering the light [Embodiment] 201106785 Referring to FIG. 6A, FIG. 6 is a schematic diagram of a hairspring 60 with dimming control according to an embodiment of the present invention. The light-emitting device 60 includes a voltage converter 6〇2 and an illuminating light source module 604. a feedback unit 606, a pulse modulation control unit, a dimming detection unit 610, and a signal synthesizing unit 612. The voltage converter 6〇2 converts the input voltage Vin according to a pulse control signal sPWM The output drive voltage % is outputted, and the output drive VD is supplied to the hairline impurity 4. The unit_surface is connected to the illuminating light source module 604' for generating - feedback voltage & pulse wave modulation control unit 6 〇 8 face Connected to the illuminating smooth surface group 604, the feedback unit _ and the electrical multiplexer, for controlling the financial pressure v_ according to the feedback voltage VFBA-_, generating a pulse wave (four) signal to the voltage converter 6G2 to control the voltage converter 6()2 converts the appropriate output drive voltage VD. The dimming detection unit 610 is used by the pulse modulation control unit to detect the control signal Sc and detect the frequency of the control signal ^ to generate a duty cycle D of the signal signal ^ and the output control signal Sc. The signal synthesizing unit 612 is coupled to the dimming detecting unit (4) and the pulse wave modulation unit _ for generating a dimming (four) dragon according to the duty cycle D of the control signal & and a reference voltage Vr£f ' for the pulse wave The modulation control unit 6〇8 converts the corresponding output driving voltage vD′ according to the control voltage converter to control the transmission & driving current 1 Iled ' flowing through the illuminating light source module _ to achieve the purpose of dimming. Briefly, the present invention determines whether or not to perform the dimming private sequence through the dimming detecting unit 61. When the dimming detection unit 61 clamps to the control signal center, and detects that the frequency of the control signal breaking Sc is greater than or the material-preparation & full, the dimming unit (10) enters - 201106785 step generates the enable signal sg pulse wave modulation The control unit (10) controls the pulse modulation suppression material_stop execution-soft start procedure, and outputs the duty cycle D of the (4) signal & to the signal synthesizing unit 612 to generate the dimming control voltage %. In addition, when the dimming detection list: (10) detects that the frequency of the control signal Sc is less than the detection frequency ^, the dimming detection unit 7L 610 generates the enable signal Sen to the pulse modulation control unit 6 (10) to control the pulse wave control. The operation of the fresh element _ stop sending _ (four) is still detected, and the frequency of the control signal Sc is detected to be greater than or equal to a detection frequency. When the illuminating device 60 enters the dimming mode, it operates. Further, when the illuminating device 60 enters the dimming mode, the dimming detecting unit 610 transmits the information of the duty cycle D of the control signal Sc to the signal synthesizing unit 612. Please refer to FIG. 7 and FIG. 7 is a schematic diagram of the signal synthesizing unit 612 in FIG. The signal synthesizing unit 612 includes a signal generating unit 7〇2 and a low-pass unit 7〇4. The signal generating unit 7〇2 is secreted by the dimming detecting unit_ for generating the silk adjusting number s based on the duty D of the control signal Sc and the reference cake %. The low-pass filter unit 704 is coupled to the signal generating unit 7〇2 for filtering the high-frequency portion of the dimming signal s to generate the dimming control voltage Vdim of the low-frequency DC portion. Preferably, the signal generating unit 702 can multiply the duty cycle d of the control signal sc by the reference voltage by Vref to generate the dimming signal S. In this case, if the frequency of the control signal Sc is low frequency, after the dimming signal S passes through the low-pass filtering unit 704, the dimming control voltage Vdim generated is in a digital form, and the low-frequency component of the control signal sc is retained. Similarly, if the frequency of the control signal sc is high frequency, after the dimming signal s passes through the low-pass filtering unit 704, the frequency-frequency portion of the dimming signal s is removed, and the dimming control of the low-frequency DC portion is generated. vDlM. 201106785 For example, if you call Se's resignation _, you can control the dimming of the electric light V brain and dim the light. If the frequency of the control signal Sc is high frequency, the dimming signal S passes through the low-pass ship unit 7〇4, and becomes a dimming control electric quantity V function of the analog DC type to perform dimming control. Fig. 8 and Fig. 9 are respectively schematic diagrams showing an ideal output moving current Iideal and an actual output driving current ILED when the control signal is at a low frequency and a high frequency according to an embodiment of the present invention. It can be seen from FIG. 8 and FIG. 9 that the actual driving current through the output of the illuminating light source module 604 is low or low, so that the present invention detects the control signal Sc through the dimming detecting unit 610. The shoulder-pull rear-paste signal synthesizing unit 612 generates a dimming control voltage , function, so that the pulse-wave modulating control unit 608 generates an output driving ink VD according to the control voltage machine 6〇2 to change the average flow through the illuminating light source. The output of the module _ drives the current ILED size, which in turn achieves the average brightness control of the illuminating light source module. In this way, compared with the conventional technology, the present invention can generate a fresh and stable rotating current at a high frequency or a low frequency to perform the adjustment order, and can effectively suppress the generation of the noise. For details on how to operate the illuminator £60, please continue to refer to the following instructions. FIG. 10 is a flow chart of a process 1000 according to an embodiment of the present invention. The process is used to implement the ordering of the light-emitting device 60. The process 1000 includes the following steps: Step 1002: Start. V step 1004. Detecting the control signal Sc and detecting the frequency of the control signal heart. , step 006. According to the frequency of the control signal heart, generate the enable signal ^ ΕΝ and turn out the duty cycle D of the 201106785 control signal sc. The step is difficult to control the frequency of the city SC is greater than or equal to a detection frequency. At the time, the dimming control voltage ν_ ' is generated to perform the dimming procedure according to the control shed D and the reference plane v 控制. Step 1010: End. For the detailed description of the process and the related changes, please refer to the above description, and will not go into details here. It should be noted that the hairline 60 is the same as the actual one, and the person skilled in the art can make different changes according to the present invention, and is not limited thereto. For example, the illuminating light source module 204 can include a plurality of parallel LED illuminator strings, but not only the illuminating diode array. On the other hand, since the light-emitting diode system is a current-driven component, the luminance of the light-emitting diode is proportional to the magnitude of the driving current, that is, the luminance of the light-emitting diode is greater. Generally speaking, in order to achieve the same brightness requirement for the current flowing through each of the light-emitting bodies, therefore, in the present embodiment, each of the light-emitting diode series includes a phase _ and a series = body 'but The light-emitting diode series is limited to a plurality of serially connected light-emitting diodes and may include only a single-light-emitting diode. In addition, since the frequency limit that the human eye can't detect is about 6〇 to the job, therefore, the frequency of fdet is calculated to be between 6G and should be said to be 'guaranteed according to the control signal Sc. The dimming procedure, when controlling the value of light = body opening, is not noticed by the eyes. X-201106785, ''T, as described above, compared with the prior art, the embodiment of the present invention is a dimming private sequence in each frequency range. 'The non-ideal driving current ILED is not generated due to the surge effect, Lead to dimming effect; ί; good. The lion transmits the dimming control voltage v_ through the dimming unit _, after touching the dimming mode, and uses the signal synthesizing unit 612 to generate the dimming control voltage v_, so that the pulse wave modulation control is early 7〇6〇8 to control the voltage converter 6〇2 The output driving voltage % is generated to change the average output driving current lLED that flows through the illuminating source 604, thereby achieving the average brightness control of the illuminating source surface. The domain—to the high-frequency or low-frequency of the current day—can produce accurate and flawless crane currents to simplify the program, and can also suppress the generation of audio noise. The above description is only the preferred embodiment of the present invention, and all of the products according to the present invention are covered by _本(四). She is surrounded by a simple description of the figure. Figure 1 is a schematic diagram of a conventional-digital dimming control device. Fig. 2 is a diagram showing the shift of the output drive_flow at a low frequency when the conventional dimming control signal is used. Treasures' Turning Current and Actuals Figure 3 is a schematic diagram of the ideal wheeling drive current at high frequencies when the green signal is used. %/Claw and only Figure 4 is a schematic diagram of the conventional dimming control signal at high frequency and the output drive current and the actual output Lin current. ', ', / β when 'ideal loss 201106785 Figure 5 is the conventional dimming control signal at high frequency and the duty cycle is %. A schematic diagram of the output drive current and the actual output drive current. 5/. Ideal, FIG. 6 is a sound diagram of a light-emitting device with dimming control according to an embodiment of the present invention. Fig. 7 is a schematic diagram of the signal synthesizing unit in Fig. 6. FIG. 8 is a schematic diagram of the ideal driving current and the actual output driving current when the control signal is at a low frequency according to an embodiment of the present invention.
第9圖為本發明實施例控制訊號在高頻時，理想輪出驅動電流與 實際輸出驅動電流之示意圖。 第10圖為本發明實施例一流程之流程圖。 【主要元件符號說明】 10 10 102 ' 602 • 104 、 606 106 、 608 60 604 610 612 702 704 數位調光控制裝置 發光元件 電壓轉換器 回授單元 脈波調變控制單元 發光裝置 發光光源模組 調光檢測單元 訊號合成單元 訊號產生單元 低通滤波單元 13 201106785 1000 流程 1002 、 1004 、 1006 、 1008 、 1010 步驟 D 工作週期 lideal 理想輸出騍動電流 Iled 輸出驅動電流 fdet 檢測頻率 s 調光訊號 Sc 控制訊號 Sdim 調光控制訊號 Sen 致能訊號 SpWM 脈波控制訊號 tl 上升時間 t2 下降時間 vD 輸出驅動電壓 Vfb 回授電壓 Vin 輸入電壓 V〇im 調光控制電壓 Vref 參考電壓FIG. 9 is a schematic diagram of an ideal wheel drive current and an actual output drive current when the control signal is at a high frequency according to an embodiment of the present invention. FIG. 10 is a flow chart of a process of an embodiment of the present invention. [Main component symbol description] 10 10 102 ' 602 • 104 , 606 106 , 608 60 604 610 612 702 704 Digital dimming control device Light-emitting element voltage converter feedback unit Pulse wave modulation control unit Light-emitting device Light source module adjustment Light detecting unit signal synthesizing unit signal generating unit low pass filtering unit 13 201106785 1000 Flow 1002, 1004, 1006, 1008, 1010 Step D duty cycle lidar ideal output flick current Iled output drive current fdet detection frequency s dimming signal Sc control signal Sdim dimming control signal Sen enabling signal SpWM pulse wave control signal t1 rise time t2 fall time vD output drive voltage Vfb feedback voltage Vin input voltage V〇im dimming control voltage Vref reference voltage