200844941 九、發明說明： 【發明所屬之技術領域】 為~ 種發光二極體（Light Emitting Diodes: LED)背光 燈之色序法（Sequential Color Display: SCD)驅動電路。尤指 一種用於驅動一液晶顯示器（LCD)之面板的LED背光燈之 色序法驅動電路的色彩與電源管理控制電路。 【先前技術】 傳統的發光二極體背光燈驅動電路具有三組轉換 器’每組轉換器分別驅動一種色光的LED陣列。由於採用 色序法顯不技術，驅動電路循序地點党二組紅綠監光的 LED陣列，因此只需要一組轉換器。若以單組轉換器做為 驅動電路，可大幅降低系統之體積、重量與成本，然而其 控制方法卻較複雜，需要微處理器、控制積體電路 (Integrated Circuit: 1C)以及由許多類比電路所組成的控制 電路。 隨著科技發展，顯示器大量地被應用在日常生活中， 尤其以液晶顯示器（Liquid Crystal Display: LCD)為最。由於 液晶顯示器為非自發光性之顯示器，故必須藉助背光燈所 提供之光線，才能達到顯示的功能。目前普遍利用冷陰極 螢光燈（Cold Cathode Fluorescent Lamp: CCFL)作為背光燈 之發光源。 在傳統的LCD顯示技術中，由背光燈發出白光，再經 5 200844941 由彩色濾、光片分成紅綠藍三個顏色。然而彩色濾光片的成 本約佔月光燈之20 /〇’且其光利用率（jjght utilization Efficiency: LUE)約只有37 %，因此去除彩色濾光片能大幅 降低LCD之成本和功率。 新-代顯不技術由紅綠藍三色之背光燈循序發光，以 快速地轉換做加法混色來得到任意有色光，因此不需要彩 色濾光片，此顯示技術被稱為SCD。為了避免人類之肉眼 能夠祭覺出來，每段發光源之發光時間必須非常短暫，因 r此所選擇的發光源必須能夠在短時間内做快速地切換。和 CCFL相較，LED之響應快許多，因此比較適合作為色序 法的發光源。並且，LED作為背光源具有以下優點：丨.壽 命較長；2. +需高壓點燈；3.不含汞，無環境污染問題； 以及4 ·色彩範圍較廣。 雖然目前許多廠商致力於研發含汞量較低與色彩範 圍杈廣之CCFL，然而反應速度卻是CCFL不易改善之缺 點，因此以LED作為LCD色序法顯示器之背光燈的發光 I' 源為未來發展的趨勢。 職是之故，發明人鑒於習知技術之缺失，乃思及改良 發明之意念，終能發明出本案之「液晶顯示器之發光二極 體背光燈的色序法驅動電路及其控制方法」。 【發明内容】 本發明之目的，在於提供一種電源與色彩管理控制 ic，搭配單組LED背光燈色序法驅動電路，使紅綠藍三色 200844941 之 LED陣列能夠循序地激發出亮度、波長以及色度皆準確 之有色光線。 本案之另一主要目的在於提供一種色彩與電源管理控 制電路’包含一光迴授控制電路，接收一光迴授訊號與一 標準電壓訊號，並據以產生一電流命令訊號，一電流型脈 覓凋雙控制态，接收該電流命令訊號、一同步訊號與一感 測電流訊號，並據以產生一第一驅動訊號用於控制一驅動 電流，以及一調光控制器，接收該同步訊號與一調光訊號， 並據以產生一第二驅動信號，用於控制一有色光。 根據上述之構想，該管理控制電路用於控制一具一電 =轉換扣 光感應裔與一發光二極體陣列之背光燈驅動 私路其中σ亥光感應裔用以偵測該發光二極體陣列的一光 輸出’且據以產生該光迴授訊號，該第一驅動訊號係用以 驅動該電源轉換器以產生該驅動電流，且該第二驅動信號 係用以依-色序法以驅動該發光二極料列並發出該光。 根:康上述之構想’該電源轉換器包括一第一功率開 ^ »亥第.驅動訊號係用以驅動該第一功率開關，以使該 電源轉換器提供該驅動電流，該發光二極_列包括 二 一第三功率開關與—第四功率開關，該第二 ”^動仏號更包括一第一至一笛一日日^ ^ 色戽、罘二閘極驅動信號，據以依該 :序法而痛序驅動該第二功率開關、該第 弟四功率開關，使該陣列激發出由__ s/、5玄 光所合成之該光。 出由《工先、-綠光與一藍 根據上述之構想，該陣列係為一色序法發光二極體陣 200844941 列0 根據上述之構想，該光迴授訊號包括一紅光感應電壓 值、一綠光感應電壓值與一藍光感應電壓值，該標準電壓 訊號包括一紅光標準電壓值、一綠光標準電壓值與一藍光 標準電壓值，且該光迴授控制電路包括一多工器，接收該200844941 IX. Description of the invention: [Technical field to which the invention pertains] is a Sequential Color Display (SCD) drive circuit of a Light Emitting Diodes (LED) backlight. In particular, a color and power management control circuit for a color sequential driving circuit of an LED backlight for driving a panel of a liquid crystal display (LCD). [Prior Art] A conventional light-emitting diode backlight driving circuit has three sets of converters. Each of the converters drives a color light LED array. Since the color-sequence method is not technical, the driver circuit sequentially orders the LED array of the red group of the party and the second group, so only one set of converters is needed. If a single converter is used as the drive circuit, the size, weight and cost of the system can be greatly reduced. However, the control method is complicated, requiring a microprocessor, a control integrated circuit (1C), and many analog circuits. The control circuit is composed. With the development of technology, displays have been widely used in daily life, especially liquid crystal displays (LCDs). Since the liquid crystal display is a non-self-illuminating display, it is necessary to use the light provided by the backlight to achieve the display function. Cold Cathode Fluorescent Lamps (CCFLs) are commonly used as illumination sources for backlights. In the traditional LCD display technology, white light is emitted by the backlight, and then divided into red, green and blue colors by color filter and light film according to 5 200844941. However, the cost of color filters accounts for about 20/〇 of the moonlight and its jjght utilization Efficiency (LUE) is only about 37%. Therefore, removing the color filter can greatly reduce the cost and power of the LCD. The new-generation technology is a step-by-step illumination of red, green and blue backlights, which can be quickly converted to add color to obtain any colored light. Therefore, color filters are not required. This display technology is called SCD. In order to avoid the human eye being able to pay attention to it, the illumination time of each illumination source must be very short, because the selected illumination source must be able to switch quickly in a short time. Compared with CCFL, LED responds much faster, so it is more suitable as a light source for color sequential method. Moreover, LED as a backlight has the following advantages: 丨 long life; 2. high-voltage lighting; 3. no mercury, no environmental pollution; and 4 · wide range of colors. Although many manufacturers are currently working on the development of CCFLs with low mercury content and wide color range, the reaction speed is a disadvantage that CCFL is not easy to improve. Therefore, the LED I use as the backlight of the LCD color sequential display is the future. The trend of development. As a result of the job, the inventor, in view of the lack of the prior art, thought of and improved the idea of invention, and finally invented the color-sequential driving circuit and control method of the LED backlight of the liquid crystal display. SUMMARY OF THE INVENTION The object of the present invention is to provide a power supply and color management control ic, with a single group of LED backlight color sequence driving circuit, so that the red, green and blue color 200844941 LED array can sequentially stimulate the brightness, wavelength and Colored light with accurate chromaticity. Another main purpose of the present invention is to provide a color and power management control circuit that includes an optical feedback control circuit that receives an optical feedback signal and a standard voltage signal, and generates a current command signal, a current type pulse. Receiving the dual control state, receiving the current command signal, a synchronization signal and a sensing current signal, and generating a first driving signal for controlling a driving current, and a dimming controller for receiving the synchronization signal and Dimming the signal and generating a second driving signal for controlling a colored light. According to the above concept, the management control circuit is configured to control a backlight driving private circuit of a light-converting light-sensing light-sensing body and a light-emitting diode array, wherein the sigma light sensor is used to detect the light-emitting diode An optical output of the array is operative to generate the optical feedback signal, the first driving signal is used to drive the power converter to generate the driving current, and the second driving signal is used for color-dependent method The light emitting diode array is driven and emits the light. Root: Kang's conception' The power converter includes a first power switch. The drive signal is used to drive the first power switch to enable the power converter to provide the drive current. The column includes a second power switch and a fourth power switch, and the second "second" switch includes a first to one day, a ^^ color, a second gate drive signal, according to which : The sequence method and the pain sequence drive the second power switch and the fourth power switch, so that the array excites the light synthesized by __ s/, 5 Xuanguang. The work is preceded by - green light and one According to the above concept, the array is a color sequential light emitting diode array 200844941. According to the above concept, the optical feedback signal includes a red light induced voltage value, a green light induced voltage value and a blue light induced voltage. a value, the standard voltage signal includes a red standard voltage value, a green standard voltage value, and a blue standard voltage value, and the optical feedback control circuit includes a multiplexer to receive the
同步訊號用於使 光迴授訊號與該標準電壓訊號，並依序輸出該紅光感應電 壓值與該紅光標準電壓值、該綠光感應電壓值與該綠光標 準電壓值及該藍光感應電壓值與該藍光標準電壓值其中之 任一組，以及一誤差放大器，耦合於該多工器，接收一债 測電流，並據以產生該電流命令訊號，其中該電流型脈寬 調變控制器係選自一峰值電流控制電路、一平均電流控制 電路與一電荷控制電路其中之任一，用於以該第一驅動訊 號控制具一第一功率開關之一電源轉換器的該驅動電流， 該偵測電流係一流經該第一功率開關之電流的偵測值，該 具电光—極體陣列之驅 液晶面板 動電路與該管理控制電路均同步動作，該發光二極體陣列 具一紅光發光二極體陣列、一綠光發光二極體陣列、一藍 光：光二極體陣列、一第二功率開關、一第三功率開關： —第四功率開關，該第二驅動訊號具一第一至一第二閘j亟 驅動訊號，用於循序驅動該第二至該第四功率開關7二】 該紅色、該綠色與該藍色發光二極體陣列逐—發光，並 j °亥色序法之一效果，且該調光訊號，係用於 ' $、 該綠色與魅色功钱n任比率1難ς;色、、 该綠色與該藍色發光二極體陣列之-亮度。 人 8 200844941 」艮據上述之構想’該管理控制電路，係為一色彩與電 違值電流控制電路，包括一具一外接電容器或一外接電 阻裔之振ill，該驅動電路更包括_光感應模組用於偵測 口亥、、工光毛光—極體陣列所發出之一紅光、該綠光發光二極 體:車列所發出的—綠光與該藍光發光二極體陣列所發出之 一監光，㈣積體電路包括—紅光標準值輸人端，接收該 紅光標準電Μ值，-綠光標準值輸人端，接收該綠光標準 電壓值，一藍光標準值輸入端，接收該藍光標準電壓值， 一紅光偵測值輸入端，接收該紅光感應電壓值，一綠光偵 測值輸入端，接收該綠光感應電壓值，一藍光偵測值輸入 端，接收該藍光感應電壓值，一電容器/電阻器連接端，耦 合於該外接電容器或該外接電阻器，一補償器連接端，耦 合於一外加之補償器電路，並接收一補償電壓，一電流輸 入编，接收该偵測電流，一電壓輸入端，接收一供應電壓， 一接地端，用於接地，一致能/保護訊號輸入端，用於接收 一致能訊號、一過壓保護訊號與一過流保護訊號，一同步 訊號輸入端，用於接收該同步訊號，一調光訊號輸入端， 用於接收該調光訊號，一第一驅動訊號輸出端，用於輸出 該第一驅動訊號，一第二驅動訊號輸出端，用於輸出該第 一閘極驅動訊號’一第三驅動訊號輸出端，用於輸出兮第 一閘極驅動訊號，以及一第四驅動訊號輸出端，用於輸出 該第三閘極驅動訊號。 根據上述之構想，該管理控制電路係用於控制_液曰曰 9 200844941 顯不器之發光二極體色序法背光燈之驅動電路。 本木之又一主要目的在於提供一種發光二極體背光燈 =驅動電路丄包含-功率因素校正器，接收-交流輸入電 【吳輸出-第-直流輸出電壓，—電源轉換器，接收該第 直級輸出電壓與輪出一第二直流輸出電壓，一發光二極 體陣列，依一色序法循序發出一紅光、一綠光與一藍光， 並據以合成一有色光，一光感應模組，偵測該發光二極體 陣列所發出之該紅光、該綠光與該藍光，並據以產生一光 ( 迴杈吼號，以及一色彩與電源管理控制電路，包含一光迴 杈控制電路，接收該光迴授訊號與一標準電壓訊號，並產 生一電流命令訊號，一電流型脈寬調變控制器，接收該電 流命令訊號、一同步訊號與一感測電流訊號，產生一第一 驅動λ號，並據以驅動該電源轉換器及產生一驅動電流， 以及一調光控制模組，接收該同步訊號與一調光訊號，產 生一第二驅動信號，並據以驅動該發光二極體陣列及控制 該有色光。 L’根據上述之構想，該電源轉換器具一第一功率開關， 該發光二極體陣列具一紅光發光二極體陣列、一綠光發光 二極體陣列、一藍光發光二極體陣列、一第二功率開關、 一第二功率開關與一第四功率開關，該第一驅動訊號用於 驅動该第一功率開關以產生該驅動電流，該第二驅動訊號 包括一第一閘極驅動訊號、一第二閘極驅動訊號與一第三 閘極驅動訊號’該第一閘極驅動訊號用於驅動該第二功率 開關以產生该紅光，該第二閘極驅動訊號用於驅動該第三 200844941 功率開關以產生該綠光，該第三閘極驅動訊號用於驅動該 第四功率開關以產生該藍光。 根據上述之構想，該功率因素校正器係為一升壓型功 率因素校正器。 根據上述之構想，該交流輸入電壓係為一市電，且該 電源轉換為係選自一降壓式轉換器、一升降壓式轉換器、 一邱克轉換器（cuk converter)、一集塔轉換器（zeta converter)、一順向式轉換器、一推挽式轉換器、一半橋式 Γ 轉換器與一全橋式轉換器其中之任一。 根據上述之構想，該光感應模組包括一紅光感應器、 一綠光感應器與一藍光感應器，該紅光感應器用於偵測該 紅光，该綠光感應器用於偵測該綠光，且該藍光感應器用 於偵測該藍光。 根據上述之構想，該驅動電路係用於驅動一液晶顯示 器之面板的發光二極體色序法背光燈。 本案之下一主要目的在於提供一種發光二極體背光燈 驅動電路的控制方法，其中該驅動電路包括一電源轉換 器、一發光二極體陣列、一光感應模組及一具一光迴授控 制電路 電飢型脈見调變控制器與一調光控制哭之色來 與電源管理控制電路，該方法包含下列之步驟 感應模組偵測該發光二極體陣列所發出之一紅光、一綠光 與-藍光’並據以產生4迴授訊號；(b)藉由該光迴授控 制電路接收該光迴授訊號、一外加之同步訊號與一外加之 標準電壓訊號，並據以產生一電流命令訊號；（c)藉由該 200844941 電流型脈寬調變控制器接收該電流命令訊號、該同步訊號 與該電源轉換器之一感測電流’並據以產生一第一驅動訊 號二用於驅動該電源轉換器以產生一驅動電流；以及（幻藉 由該調光控制器模組接收該同步訊號與一外加之調光訊 號並據以產生一弟—驅動訊號，用於驅動該陣列，俾依 循一色序法順序發出該紅光、該綠光與該藍光，並據以合 成一有色光。 根據上述之構想，该光迴授訊號包括一紅光感應電壓 值、一綠光感應電壓值與一藍光感應電壓值，該標準電壓 訊號包括一紅光標準電壓值、一綠光標準電壓值與一藍光 標準電壓值，該光迴授控制電路包括一多工器以及一耦合 於"亥夕工态之誤差放大器，且該步驟（b)更包括下列之步 驟·（M)藉由該多工器接收該光迴授訊號與該標準電壓訊 號，並依序輸出該紅光感應電壓值與該標準紅光電壓值、 該綠光感應電壓值與該標準綠光電壓值及該藍光感應電壓 值與该標準藍光電壓值其中之任一組；以及（b2)藉由該誤 差放大器以產生該電流命令訊號。 根據上述之構想，該電源轉換器具一第一功率開關， 该感測電流係為流經該第一功率開關之一電流的感測值， 且该步驟（c)更包括一步驟和丨）藉由該第一驅動訊號以驅動 该第一功率開關，俾產生該電源轉換器的該驅動電流。 根據上述之構想，該第二驅動訊號包括一第一、一第 一與一第二閘極驅動訊號，該發光二極體陣列具一紅光發 光二極體陣列、一綠光發光二極體陣列、一藍光發光二極 12 200844941 體陣列、-第二功率開關、一第三功率開關與一第四功率 開關，且該步驟(d)更包括下列之步驟:(dl)藉由該第—間極 驅動訊號驅動㈣二功率開_產生該紅光，藉由該第二 閘極驅動訊號驅動該第三功率開關以產生該綠光及藉由該 弟f問極驅動訊號驅動該第四功率開關以產生該藍光，二 使肩紅色、該綠色與該藍色發光二極體陣列逐一發光，俾 達到该色序法之—效果；（d2)藉由該調光訊號以調變該紅 色、該綠色與該藍色功率開關之—責任比率，俾分別調整 4紅色、該綠色與該藍色發光二極體陣列之—亮度；以及 ⑷)藉由該同步訊號以使該驅動電路與—液晶面板同步動 作。 /為了讓本發明之上述目的、特徵、和優點能更明顯易 I*，下文特舉較佳實施例，並配合所附圖式，作詳細說 如下： 【實施方式】 b請參照第一圖，第一圖所示為本發明提出之一種LED 月光燈色序法驅動電路，包含市電輸人1G、控制IC⑽、 昇壓（Boost)型功率因數校正器（p〇wer Fact〇r c組灿叫 PFC) 200、電源轉換 器300與色序法LED陣列4〇〇(其包含一具有複數個led 之紅光LED _ Dr、一串連於該紅光咖陣列％之功 率開關MR、一具有複數個LED之綠光LED陣列ο。、一 串連於该紅光LED陣列DG^功率開關Mg、—具有複數個 13 200844941 led之監光LED陣列Db與一串連於該藍光LED陣列 之功率開關MB) ’以及光感應模組（ph〇t〇 Sens〇r Module) 5〇〇(其包含一紅光感應器51〇、一綠光感應器511與一藍光 感應器512用於接收該紅光LED陣列、該綠光LED陣列 與該藍光LED陣列所發出之一紅光Lr、一綠光Lg與一藍 光lb，及輸出紅、綠與藍光感應電壓值VpR、乂⑽與v抑 、、、6 PR、Pg與PB之接腳）。控制1C 100提供電源轉換器3〇〇 中的一功率開關Μι (見第四圖）以及色序法LED陣列400 中的三個功率開關（MR、]\40與Mb)之驅動訊號。 請參照第二圖與第三圖，第二圖所示為本發明之控制 ic 1〇〇内部架構圖，第三圖為本發明之控制IC之理想波形 示意圖。控制ic 1〇〇之架構主要由光迴授控制電路11〇、 電流型脈波寬度調變 控制态120 ’以及調光控制器13〇所組成。其中如第一與 第二圖中所示之接腳SR、SG與SB分別為紅光、綠光以及 藍光標準值之輸入端；？11、？(}與PB分別為紅光、綠光以及 藍光偵測值VPR、VPG與VPB之輸入端；RT/CT為外接震盪 電容器、電阻器之腳位；vc為外接補償器之腳位；Is為電 源轉換器300之該功率開關Mi的偵測電流值之輸入端； Vcc為供應電壓之輸入端，GND為接地端；Syn為同步訊 號之輸入端；EN/OVP/ OCP為致能與（過電壓及過電流)保 護訊號之輸入端；Dm為調光訊號之輸入端；qr、（3(}與qb 分別為串聯於紅光、綠光以及藍光LED陣列之功率開關的 閘極驅動訊號輸出端；PWM為轉換器之功率開關的閘 14 200844941 極訊號輸出端；本發明之控制ic内部各功能區塊詳細說明 如下： (1)光迴授控制電路110 光迴授控制電路110由多工器111與誤差放大器112 所組成。由於各顆LED之間存在差異性，且其光輸出受溫 度影響甚矩，因此必須由光感應模組500债測其光輸出， 再迴授予控制器，以達到閉迴路控制。然而不同廠商之光 感應模組500與1^0皆有不同的規格，即使由同一家廠商 C ' 所生產出的同一批光感應模組500與LED，亦會存在些微 的差異。本專利提供一組光感應模組500之標準電壓值輸 入端811、8(3與SB，讓使用者能夠因應不同廠牌的光感應模 組500與LED，輸入相對應之標準電壓值VSR、VSG、VSB 〇 而光感應模組500偵測到紅綠藍光LED陣列400所發出之 光線後^將分別輸出紅、綠、監光感應電壓值VpR、Vp〇與 VpB給Pr、Pg與Ρβ之接腳。而標準電壓值Vsr、Vsg與Vsb 為VPR、VPG與VPB的參考值，兩者經過誤差放大器112之 I 後，得到電流命令訊號ICQm進入電流型脈寬調變控制器 120。 由於vSR、VSG與VSB在同一時間只用到一個訊號， VPR、VPG與VPB亦然，因此只需要一個誤差放大器112，The synchronization signal is used to enable the optical feedback signal and the standard voltage signal, and sequentially output the red light induced voltage value and the red light standard voltage value, the green light induced voltage value and the green light standard voltage value, and the blue light sensing a voltage value and any one of the blue standard voltage values, and an error amplifier coupled to the multiplexer, receiving a debt measurement current, and generating the current command signal, wherein the current mode pulse width modulation control The device is selected from a peak current control circuit, an average current control circuit and a charge control circuit for controlling the driving current of a power converter having a first power switch by the first driving signal, The detection current is a first-class detection value of the current through the first power switch, and the liquid crystal panel driving circuit with the electro-optical array is synchronized with the management control circuit, and the LED array has a red color. a light emitting diode array, a green light emitting diode array, a blue light: an optical diode array, a second power switch, and a third power switch: - a fourth power switch The second driving signal has a first to a second gate driving signal for sequentially driving the second to the fourth power switch 7). The red, the green and the blue LED array are - illuminating, and one of the effects of the j ° ray color method, and the dimming signal is used for '$, the green and the enchantment power n ratio is difficult; color, the green and the blue illuminating The brightness of the diode array. Person 8 200844941 "According to the above concept, the management control circuit is a color and power violation current control circuit, including a vibration capacitor with an external capacitor or an external resistor, the drive circuit further includes _ light sensing The module is used for detecting a red light emitted by the mouth, the work light, and the green light emitting diode, the green light emitting diode: the green light emitted by the train and the blue light emitting diode array One of the supervisory lights is issued, and (4) the integrated circuit includes a red light standard value input terminal, receives the red light standard power threshold value, a green light standard value input terminal, receives the green light standard voltage value, and receives a blue light standard value. The input end receives the blue standard voltage value, a red light detection value input end, receives the red light induced voltage value, a green light detection value input end, receives the green light induced voltage value, and receives a blue light detection value input Receiving the blue induced voltage value, a capacitor/resistor connection end coupled to the external capacitor or the external resistor, a compensator connection end coupled to an external compensator circuit and receiving a compensation voltage, Current output Editing, receiving the detection current, a voltage input terminal, receiving a supply voltage, a ground terminal for grounding, a uniform energy/protection signal input terminal for receiving a uniform energy signal, an overvoltage protection signal and an overcurrent a protection signal, a synchronous signal input terminal for receiving the synchronization signal, a dimming signal input end for receiving the dimming signal, and a first driving signal output end for outputting the first driving signal, The second driving signal output terminal is configured to output the first gate driving signal 'a third driving signal output terminal, for outputting the first gate driving signal, and a fourth driving signal output terminal for outputting the first Three gate drive signals. According to the above concept, the management control circuit is used to control the driving circuit of the LED backlighting backlight of the liquid crystal 9 200844941 display device. Another main purpose of this wood is to provide a light-emitting diode backlight=drive circuit 丄including-power factor corrector, receiving-AC input power [Wu output-D-DC output voltage, power converter, receiving the first The direct output voltage and the second DC output voltage are rotated out, and a light-emitting diode array sequentially emits a red light, a green light and a blue light according to a color sequence method, and synthesizes a colored light, a light induction mode And detecting the red light, the green light and the blue light emitted by the LED array, and generating a light (returning a ,, and a color and power management control circuit, including a light return) The control circuit receives the optical feedback signal and a standard voltage signal, and generates a current command signal, and a current type pulse width modulation controller receives the current command signal, a synchronous signal and a sensing current signal to generate a The first driving λ number, and driving the power converter and generating a driving current, and a dimming control module, receiving the synchronous signal and a dimming signal, generating a second driving signal, and According to the above concept, the power converter has a first power switch, the light emitting diode array has a red light emitting diode array, and a green color. a light emitting diode array, a blue light emitting diode array, a second power switch, a second power switch and a fourth power switch, wherein the first driving signal is used to drive the first power switch to generate the driving Current, the second driving signal includes a first gate driving signal, a second gate driving signal and a third gate driving signal. The first gate driving signal is used to drive the second power switch to generate the current Red light, the second gate driving signal is used to drive the third 200844941 power switch to generate the green light, and the third gate driving signal is used to drive the fourth power switch to generate the blue light. According to the above concept, The power factor corrector is a boost type power factor corrector. According to the above concept, the AC input voltage is a mains power, and the power conversion is selected from a buck conversion. , a buck-boost converter, a cuk converter, a zeta converter, a forward converter, a push-pull converter, a half bridge converter and a According to the above concept, the light sensing module includes a red light sensor, a green light sensor and a blue light sensor, and the red light sensor is used to detect the red light. The green light sensor is configured to detect the green light, and the blue light sensor is configured to detect the blue light. According to the above concept, the driving circuit is used to drive a light emitting diode color sequential backlight of a panel of a liquid crystal display. The main purpose of the present invention is to provide a control method for a backlight driving circuit of a light-emitting diode, wherein the driving circuit comprises a power converter, a light-emitting diode array, a light-sensing module, and a light-returning module. The control circuit is electrically hunted, and the modulation controller and a dimming control are used to control the circuit. The method includes the following steps: the sensing module detects one of the LED arrays. Light, a green light and a blue light are generated to generate a 4-receiving signal; (b) receiving, by the optical feedback control circuit, the optical feedback signal, an additional synchronization signal and an additional standard voltage signal, and And generating a current command signal; (c) receiving, by the 200844941 current-type pulse width modulation controller, the current command signal, the synchronization signal and one of the power converters sensing the current' and generating a first The driving signal 2 is used to drive the power converter to generate a driving current; and (the phantom receiving the synchronization signal and an additional dimming signal by the dimming controller module and generating a brother-drive signal, In order to drive the array, the red light, the green light and the blue light are sequentially emitted in a one-color sequence, and a colored light is synthesized accordingly. According to the above concept, the optical feedback signal includes a red light induced voltage value, a green light induced voltage value, and a blue light induced voltage value, and the standard voltage signal includes a red light standard voltage value, a green light standard voltage value, and a blue standard voltage value, the optical feedback control circuit includes a multiplexer and an error amplifier coupled to the "HD state, and the step (b) further comprises the following steps (M) by the Receiving the optical feedback signal and the standard voltage signal, and sequentially outputting the red light induced voltage value and the standard red light voltage value, the green light induced voltage value, the standard green light voltage value, and the blue light induced voltage And a value of the standard blue light voltage value; and (b2) by the error amplifier to generate the current command signal. According to the above concept, the power converter has a first power switch, the sense current is a sensed value of a current flowing through one of the first power switches, and the step (c) further comprises a step and a The first driving signal is driven by the first driving signal to generate the driving current of the power converter. According to the above concept, the second driving signal includes a first, a first and a second gate driving signal, and the LED array has a red light emitting diode array and a green light emitting diode. An array, a blue light emitting diode 12 200844941 body array, a second power switch, a third power switch and a fourth power switch, and the step (d) further comprises the following steps: (dl) by the first The inter-polar drive signal driving (4) two power-on-generation generates the red light, the third power-driven signal is driven by the second gate driving signal to generate the green light, and the fourth power is driven by the dipole driving signal Switching to generate the blue light, and secondly, the shoulder red, the green color and the blue light emitting diode array are illuminated one by one to achieve the effect of the color sequential method; (d2) the red light is modulated by the dimming signal, The ratio of the green color to the blue power switch, 俾 is adjusted by 4 red, the green and the blue LED array, respectively; and (4) by the synchronization signal to make the driving circuit and the liquid crystal The panel is synchronized. In order to make the above-mentioned objects, features, and advantages of the present invention more apparent, the preferred embodiments are described below, and in conjunction with the drawings, the details are as follows: [Embodiment] b Please refer to the first figure. The first figure shows an LED moonlight color sequence driving circuit proposed by the present invention, which includes a mains input 1G, a control IC (10), and a boost type power factor corrector (p〇wer Fact〇rc group can be called PFC) 200, a power converter 300 and a color sequential LED array 4 (which includes a red LED _ Dr having a plurality of LEDs, a power switch MR connected to the red light coffee array, and a plurality LED green LED array ο, a series connected to the red LED array DG ^ power switch Mg, - a plurality of 13 200844941 led monitor LED array Db and a series of power switches connected to the blue LED array MB) 'and a light sensing module (〇 〇 〇 〇 Module Module Module) 5 〇〇 (which includes a red light sensor 51 〇, a green light sensor 511 and a blue light sensor 512 for receiving the red light LED array, the green LED array and the red LED Lr, a green Lg and a blue light LB, and an output of red, green and blue values of the induced voltage Vpr, and v qe ⑽ suppression ,,, 6 PR, Pg and the pin PB). Control 1C 100 provides a power switch 电源ι (see Figure 4) in power converter 3〇〇 and drive signals for three power switches (MR, ]\40 and Mb) in color sequential LED array 400. Please refer to the second and third figures. The second figure shows the internal structure of the control ic 1〇〇 of the present invention, and the third figure shows the ideal waveform of the control IC of the present invention. The structure of the control ic 1 主要 is mainly composed of the optical feedback control circuit 11 〇, the current-type pulse width modulation control state 120 ′, and the dimming controller 13 。. Wherein the pins SR, SG and SB as shown in the first and second figures are the input terminals of the red, green and blue standard values, respectively; 11,? (} and PB are the input terminals of red, green and blue light detection values VPR, VPG and VPB respectively; RT/CT is the external oscillating capacitor and the pin of the resistor; vc is the pin of the external compensator; Is The input end of the power switch Mi of the power switch Mi detecting current value; Vcc is the input end of the supply voltage, GND is the ground end; Syn is the input end of the synchronous signal; EN/OVP/ OCP is the enable and Voltage and overcurrent) protection signal input; Dm is the input of the dimming signal; qr, (3 (} and qb are the gate drive signal output of the power switch connected in series to the red, green and blue LED array respectively Terminal; PWM is the power switch of the converter 14 200844941 pole signal output; the control block of the present invention is described in detail below: (1) Optical feedback control circuit 110 Optical feedback control circuit 110 is multiplexed The device 111 is composed of the error amplifier 112. Since there is a difference between the LEDs, and the light output thereof is affected by the temperature, the light output of the light sensing module 500 must be measured and returned to the controller. Closed loop control is achieved. However, different manufacturers The light sensing module 500 and the 1^0 have different specifications, even if the same batch of optical sensing modules 500 and LEDs produced by the same manufacturer C', there will be slight differences. This patent provides a set of light sensing. The standard voltage value input terminals 811 and 8 of the module 500 (3 and SB, enable the user to input the corresponding standard voltage values VSR, VSG, VSB 因 and light sensing according to the light sensing module 500 and the LED of different brands. After detecting the light emitted by the red, green and blue LED array 400, the module 500 outputs red, green, and light-sensing voltage values VpR, Vp, and VpB to the pins of Pr, Pg, and Ρβ, respectively, and the standard voltage value. Vsr, Vsg and Vsb are the reference values of VPR, VPG and VPB. After passing through I of the error amplifier 112, the current command signal ICQm is input into the current-mode pulse width modulation controller 120. Since vSR, VSG and VSB are at the same time Only one signal is used, as are VPR, VPG and VPB, so only one error amplifier 112 is needed.
不過需要一個類似多工器功能的電路111。請參閱第三圖， 在模式l(Mode 1)中，多工器111選取VSR和VPR ;在模式 2(Mode 2)中，多工器111選取VSG和VPG;而在模式3(Mode 3)中，多工器111選取VSB和VPB。另外，紅綠藍光LED 15 200844941 點免的時間必須與液晶面板同步，因此由腳位Syn接收同 步訊號，以控制多工器111之動作。 由於LED之輸出光色度會隨著驅動電流而改變，因此 在驅動LED時，常採用脈波寬度調變機制。並且，Pr、 與Pb偵測到的訊號VPR、VPG與VPB只經過高頻濾波，而 不疋用積分态平均之，因此VPR、VPG與VPB這三個訊號亦 為脈波寬度調變波形，且經過調光之後，其最高準位之電 壓值並不會變，故vSR、vSG與vSB之標準電壓參考值將不 需變動，而控制色度的機制與調光之前相同。 (2)電流型脈寬調變控制器 本專利架構圖中之電流型脈寬調變控制器12〇(見第二圖） 可以多種電流控制電路來實現，諸如··峰值電流控制法、 平均電流控制法、電荷控制法等。由於峰值電流控制法之 電路架構較簡易，因此本專利之電流型脈寬調變控制器12〇 以半值黾飢控制法為基本架構（其包括一參考電壓121、一 電源電壓122、一振盪器123、一具有二個電晶體Qi與 之類放大器124、一比較器U5與一正反器及栓鎖脈 覓凋麦印126)。由腳位is偵測流經轉換器3⑽之功率開關 M!的電流，貞光迴授控制電路11〇絲之電流訊號u比 較，並由腳位Vc外接補償電路，達到峰值電流控制，以提 ί、電源轉換态300之功率開關％所需的閘極驅動訊號 PWM’使其能夠在各色LED陣列4〇〇發光期間，均提供正 確的驅動電流。 另外，經由RT/CT腳位選擇適當的電阻值與電容值， 16 200844941 產生鑛齒波振蘯訊號予電流型脈寬調變控制器12〇與調光 控制器130使用，讓本專利之控制Ic ι〇〇操作在固定頻率。 而EN/OVP/OCP腳位同時接收致能（Enabie: en)、過 壓保護（Over Voltage Protection: 0VP)與過流保護（〇ver Current Protection: 〇CP)訊號。當系統正常操作時，此腳位 維持在高電壓狀態。當此接腳接收到低準位的訊號時，控 制1C 100將自動關閉電流型脈寬調變控制器12〇盥碉光枰 制器130 ’以保護LED陣列400，直到該接腳接收到高準二 位的訊號為止。 為了預防元件老化或不可控的情況發生，IC1⑼内部 會设定LED陣列400驅動電流上限。假設藍光LEd陣列 之驅動電流已達到上限，但vPB卻仍小於Vsb，則將不再 繼續增加藍光LED陣列之驅動電流，以防止其損毁， 大幅提升系統之可靠度。 ^ (3)調光控制器 调光控制态130在本專利中，以調變訊號、卩However, a circuit 111 similar to the multiplexer function is required. Referring to the third figure, in mode 1 (Mode 1), multiplexer 111 selects VSR and VPR; in mode 2 (Mode 2), multiplexer 111 selects VSG and VPG; and in mode 3 (Mode 3) In the multiplexer 111, VSB and VPB are selected. In addition, the red and green blue LED 15 200844941 point must be synchronized with the LCD panel, so the synchronization signal is received by the pin Syn to control the action of the multiplexer 111. Since the output chromaticity of the LED changes with the drive current, the pulse width modulation mechanism is often used when driving the LED. Moreover, the signals VPR, VPG and VPB detected by Pr and Pb are only subjected to high frequency filtering, and the integrated signals are averaged, so the three signals VPR, VPG and VPB are also pulse width modulation waveforms. After dimming, the voltage value of the highest level does not change, so the standard voltage reference values of vSR, vSG and vSB will not need to be changed, and the mechanism for controlling the chrominance is the same as before dimming. (2) Current-type pulse width modulation controller The current-type pulse width modulation controller 12〇 (see the second figure) in this patented architecture can be implemented by various current control circuits, such as · peak current control method, average Current control method, charge control method, etc. Since the circuit structure of the peak current control method is relatively simple, the current type pulse width modulation controller 12 of the present patent has a half value hungry control method as a basic structure (which includes a reference voltage 121, a power supply voltage 122, and an oscillation). The device 123 has a transistor Qi and an amplifier 124, a comparator U5 and a flip-flop, and a latching pulse 126). The current of the power switch M! flowing through the converter 3 (10) is detected by the pin is, the current signal u of the 回 light feedback control circuit 11 is compared, and the compensation circuit is externally connected by the pin Vc to achieve peak current control. The gate drive signal PWM' required for the power switch state of the power conversion state 300 enables it to provide the correct drive current during the illumination of each color LED array. In addition, the appropriate resistance value and capacitance value are selected through the RT/CT pin, 16 200844941 generates a mineral tooth wave vibration signal to the current type pulse width modulation controller 12 and the dimming controller 130, so that the control of the patent Ic 〇〇 operates at a fixed frequency. The EN/OVP/OCP pin receives both Enbian (Enabie: en), Over Voltage Protection (0VP) and Overcurrent Protection (〇) signals. This pin is maintained in a high voltage state when the system is operating normally. When the pin receives the low level signal, the control 1C 100 will automatically turn off the current mode PWM controller 12 to control the LED array 400 until the pin receives the high. The quasi-two-digit signal is up. In order to prevent component aging or uncontrollable conditions, IC1 (9) internally sets the upper limit of the LED array 400 drive current. Assuming that the driving current of the blue LED array has reached the upper limit, but the vPB is still smaller than Vsb, the driving current of the blue LED array will not be continuously increased to prevent damage and greatly improve the reliability of the system. ^ (3) dimming controller dimming control state 130 in this patent, to adjust the signal, 卩
Qb循序地驅動功率開關，讓各色LED陣列4〇〇達到色G序 法的效果。同時根據調光訊號腳位Dm接收到的電壓值，予 比例調變各功率開關之導通責任比率（Duty Ratio)，以2 各色LED陣列400之亮度。而紅綠藍光LED陣列 焭的時間必須與液晶面板同步，因此同樣由腳位s外接4 到的同步訊號，來控制調光控制器13〇之動作，使面板= 驅動電路同步動作（亦即使面板與控制IC以及陣人 400均同步動作）。舉例來說，在M〇del中，Syn 二 u 會觸 17 200844941 發多工器⑴和調光控制器13G，使多工器ιη選取 =R，並讓㈣控制器⑽與面㈣步，並使串聯於紅 先LED陣列之功率開關Mr導通。 經由以上介紹得知，本專利所述之控制ic⑽可運用 在色序法之驅動電路卜且只需單組電源轉換電路300, 便可讓LED背光燈以色序法之發光方式呈現，並精確地控 制各色LED陣列400Qb drives the power switches sequentially, so that the LED arrays of the respective colors reach the effect of the color G sequence. At the same time, according to the voltage value received by the dimming signal pin Dm, the duty ratio of each power switch is adjusted in proportion to the brightness of the LED array 400 of each color. The red, green and blue LED arrays must be synchronized with the LCD panel. Therefore, the synchronization signal from the pin s is connected to the dimming controller to control the action of the dimming controller 13 so that the panel = drive circuit can be synchronized (even if the panel Synchronized with the control IC and the array 400). For example, in M〇del, Syn II will touch 17 200844941 multiplexer (1) and dimming controller 13G, so that multiplexer ιη select =R, and let (4) controller (10) and face (four) steps, and The power switch Mr connected in series to the red LED array is turned on. According to the above description, the control ic (10) described in this patent can be applied to the driving circuit of the color sequential method, and only a single set of power conversion circuit 300 is required, so that the LED backlight can be presented in the color sequential method and accurately. Ground control LED array 400
之驅動電流。並且本專利所述之控制IC100可搭配各家廠 商之光感應H與LED，使线設計者在㈣方面有更大的 自由度。 凊麥照第四圖，第四圖所示為一依據本發明構想之較 佳實施例的LED背光燈色序法驅動電路之部份電路圖。此 驅動電路包括昇壓型功率因數校正器2〇〇、電源轉換器 300、色序法LED陣列400,以及光感應模組5〇〇。而如前 所述該色序法LED陣列400由紅光LED陣列Dr、綠光LED 陣列Dg、藍光LED陣列Db、以及功率開關Mr、…^與 MB所組成。另該光感應模組500則包含一紅光感應器 510、一綠光感應器511與一藍光感應器512。 在電源轉換裔300中，市電VAC經過昇壓型功率因數 校正器200後，升壓並整流為直流400 V。一般而言，LED 陣列400之電壓低於此值，因此需要降壓型的電源轉換器 300作為驅動電路。具有降壓效果的電源轉換器300有很 多種，若考量輸出必須為電流型，則電源轉換器300可以 降壓型（Buck)、昇降壓型（Buck-Boost)、邱克（Cuk)、集塔 18 200844941 (Zeta)、川員向式（Forward)、推挽式（Push- Pull)、半橋式 (Half-Bridge)、以及全橋式（Full-Bridge)等電路來實現。基 於安規考量，採用隔離型之轉換器較佳。以40吋之LCD 面板而言，色序法LED背光燈消耗功率低於1〇〇 W，因此 本實施例採用順向式電源轉換器。 在色序法LED陣列400中，循序地驅動功率開關Mr、 與Mb，即可讓各色led陣列400達到色序法的效果，The drive current. Moreover, the control IC 100 described in this patent can be used with the light sensing H and LED of various manufacturers, so that the line designer has greater freedom in (4). Fig. 4 is a fourth circuit diagram showing a portion of a circuit diagram of an LED backlight color sequential driving circuit in accordance with a preferred embodiment of the present invention. The driving circuit includes a boosting power factor corrector 2, a power converter 300, a color sequential LED array 400, and a light sensing module 5A. The color sequential LED array 400 is composed of a red LED array Dr, a green LED array Dg, a blue LED array Db, and power switches Mr, ..., and MB as described above. The optical sensor module 500 further includes a red light sensor 510, a green light sensor 511 and a blue light sensor 512. In the power conversion 300, the mains VAC is boosted and rectified to 400 V DC after passing through the boost power factor corrector 200. In general, the voltage of the LED array 400 is lower than this value, so a buck type power converter 300 is required as a driving circuit. There are many types of power converters 300 having a step-down effect. If the measured output must be current type, the power converter 300 can be a Buck type, a Buck-Boost type, a Cuk, and a set. Tower 18 200844941 (Zeta), Chuanyuan (Forward), Push-Pull (Half-Bridge), and Full-Bridge (Full-Bridge) circuits are implemented. Based on safety considerations, an isolated converter is preferred. In the case of a 40-inch LCD panel, the color sequential LED backlight consumes less than 1 〇〇W, so this embodiment uses a forward power converter. In the color sequential LED array 400, the power switches Mr and Mb are sequentially driven to enable the color arrays of the respective colors to achieve the effect of the color sequential method.
同時藉由調變功率開關之導通責任比率，來調變各色LED 陣列400之亮度。 而如前所述’該光感應模組500是由三顆不同的光感 應器來組成，亦即紅光感應器510、綠光感應器511與藍At the same time, the brightness of each color LED array 400 is modulated by adjusting the conduction duty ratio of the power switch. As described above, the light sensing module 500 is composed of three different light sensors, that is, a red light sensor 510, a green light sensor 511 and a blue light.
光感應器512,分別用於接收該紅光led陣列、該綠光lED 2與該藍光LED陣列所發出之一紅光Lr、一綠光Lg與 凰光Lb和輸出紅、綠與藍光感應電壓值VPR、Vpg與Vpb 給Pr、匕與PB之接腳。 v 具丨示例于説明本控制1C之動作原理，假設VSR二 二 VsG 〜2 v 與 VsB 二 3 V，而 VPR = 1 V、VPG 二 2 V 和 Vi %2·5ν，經過多工器111與誤差放大器112做誤差放大戈 動的狀態，1com升高，因此藍光LED陣列之肩 更會隨之升高，直到VpB = 3V為止。而調光只會， I LED陣歹ij之_慕t 由上述的說明 管理控制1C，搭配 守通貝任比率，不影響其光線峰值，因此言 先則後之光迴授機制相同。 可知，本發明在於提供一種電源與色彩 翠組LED背光燈色序法驅動電路，具有 19 200844941 可使紅綠藍三色之LED陣列 色度皆準確之有色光她」：序地激發出免度、波長以及 盘吝㈣^ 優點。本案具有新穎性、進步性 與產業利用性，因而裎屮士政n 1 U向杈出本發明之專利申請。 是以，縱使本案已由卜；+、 ^ ^ ^ , ., _ ^ 上逑之貫轭例所詳細敘述而可由 熟悉本技藝之人士# & r i m 匚心而為諸般修飾，然皆不脫如附 申清專利範圍所欲保護者。 【圖式簡單說明】 f ^圖··其係顯示依據本發明構想之較佳實施例的哪背 光燈色序法驅動電路之電路示意圖； 第二圖：其係顯示依據本發明構想之較佳實施例的色序法 控制1C之内部方塊圖； 第圖/、係顯不依照本發明構想之較佳實施例的色序法 控制1C之理想波形示意圖；以及 第四圖·其係顯不一依據本發明構想之較佳實施例的LED 【背総色序法_電路之部份電路圖。 【主要元件符號說明】 100 :控制1C 111 :多工器 121 :參考電壓 123 :振盪器 125 :比較器 10 :市電輸入 11 〇 :光迴授控制電路 112 :誤差放大器 1 20 ·電>’IL型脈寬調變控制哭 122 :電源電壓 124 : B類放大器 20 200844941 126 正反器及栓鎖脈寬調變器 130 :調光控制器 400 色序法LED陣列 500 :光感應模組 510 紅光感應器 511 :綠光感應器 512 藍光感應器 21The light sensor 512 is configured to receive the red LED array, the green light lED 2 and the blue LED L1, the green light Lg and the yellow light Lb, and the red, green and blue light induced voltages. The values VPR, Vpg and Vpb are given to the pins of Pr, 匕 and PB. v 丨 于 于 于 于 于 于 于 于 于 于 于 于 于 于 于 于 本 本 本 本 本 本 本 本 本 本 本 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设 假设The error amplifier 112 does the error amplification of the state of the go, 1com rises, so the shoulder of the blue LED array will rise accordingly until VpB = 3V. The dimming will only be, I LED array 歹 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ It can be seen that the present invention provides a power supply and color Cui group LED backlight color sequence driving circuit, having 19 200844941 which can make the red, green and blue LED arrays have accurate color shades of light. , wavelength and 吝 (4) ^ advantages. The case has novelty, advancement and industrial applicability, and thus the patent application of the invention is obtained by the 裎屮士政1 1 U. Therefore, even though the case has been described in detail by the example of the yoke of +, ^ ^ ^, ., _ ^, it can be modified by the people who are familiar with the art, and they are all decorated. If you want to protect the patent scope, you want to protect it. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a circuit diagram showing a backlight color sequential driving circuit according to a preferred embodiment of the present invention. FIG. 2 is a view showing a preferred embodiment of the present invention. The color sequential method of the embodiment controls the internal block diagram of 1C; the figure // shows a schematic diagram of the ideal waveform of the color sequential method 1C not according to the preferred embodiment of the present invention; and the fourth figure An LED according to a preferred embodiment of the present invention is a circuit diagram of a circuit of a circuit. [Main component symbol description] 100: Control 1C 111: Multiplexer 121: Reference voltage 123: Oscillator 125: Comparator 10: Mains input 11 〇: Optical feedback control circuit 112: Error amplifier 1 20 · Electricity > IL type pulse width modulation control crying 122: power supply voltage 124: class B amplifier 20 200844941 126 flip-flop and latch pulse width modulator 130: dimming controller 400 color sequential method LED array 500: light sensing module 510 Red light sensor 511: green light sensor 512 blue light sensor 21