1282535 15239twf.doc/c 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種背光源驅動裝置及方法，且特別 疋有關於一種掃描式(scanning)背光源驅動裝置及方法，適 用於冷陰極螢光燈管(CCFL)以及發光二極體(LED)陣列之 背光源。 【先前技術】 • ^隨著人類文明的進步，影像裝置早已成為日常生活中 • t見的產品1_示器更是這些影像裝置中不可或缺的構 件。使用者藉由顯示器讀取資訊，甚至透過顯示器間接控 制裝置的運作。其中，液晶顯示器(LCD)以其輕薄的體積、 ^低的^電里等優點’已經廣泛地應用在各種需要顯示装 _的產品上，近年來更有取代傳統陰極射線管(CRT)顯示 态的趨勢。 液a曰…員示态’係利用液晶材料的旋光性(叩Hcai activhy) 光特性來顯示㈣，但是液晶材料本身並不具備發光 卜盆’因此需要外加的背光源提供光源以使資訊可視，加 t，裝置即所謂的背光模組(backlight u_。目前背光 j多以兩種方式所構成，其中—種方式係由多個冷陰極 $燈管(CCFL)相互平行排列而成，而另一種方式則由多 I光二極體(LED)以陣列的方式排列而成。 总1、、Γ陰極螢光燈管之背光源為例，習知技術中一根燈 I厂必須^一個驅動電路來驅動，而且由於冷陰極螢光燈 ^必須以交流電壓來鶴，目此_電路通常包含 1282535 15239twf. doc/c f橋j直流/交流轉換器以及變壓器，甚至為了穩定燈管的 免度還必須有迴授控制裝置。為了降低成本，有的改用一 個驅動電路驅動兩根或是更多根燈管，可以減少一半甚至 更多的驅動f路’但是對於每―根燈管的迴授控制則是較 不精準’而且驅動電路需要比原本更高的功率轉決扇出 (fan out)的問題。 ^除此之外，在液晶顯示器上撥放動態影像時，會出現 影像的輪廓模糊不清，或者畫面有拖良、殘像的情形，這 個問題-般肇因於液晶顯示器的反應時間不夠快。解決之 道除了改進液晶顯示器的反應時間之外，另外則是模仿傳 統陰極射線管顯示原理而發展出來的掃猫式(謙恤幻背 光模、、且□為液晶顯示II之背光是屬於持續發光模 式在人眼的積分行為模式下，會造成撥放動態影像時， 由人眼看來為邊緣模糊的影像，而陰極射線管則屬於脈衝1282535 15239twf.doc/c IX. Description of the Invention: [Technical Field] The present invention relates to a backlight driving device and method, and particularly to a scanning backlight driving device and method, applicable to A backlight for a cold cathode fluorescent lamp (CCFL) and a light emitting diode (LED) array. [Prior Art] • With the advancement of human civilization, video devices have long been an indispensable component of these imaging devices. The user reads the information through the display and indirectly controls the operation of the device through the display. Among them, the liquid crystal display (LCD) has been widely used in various products requiring display equipment due to its thin and light volume, low power, and the like. In recent years, it has replaced the traditional cathode ray tube (CRT) display state. the trend of. The liquid a 曰 员 员 员 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' Add t, the device is the so-called backlight module (backlight u_. At present, the backlight j is composed of two ways, one of which is formed by a plurality of cold cathode $ tubes (CCFL) arranged in parallel with each other, and the other The method is arranged by arrays of multiple I photodiodes (LEDs). The backlight of the cathode lamp of the cathode and the cathode is taken as an example. In the prior art, a lamp I factory must have a driving circuit. Drive, and because the cold cathode fluorescent lamp ^ must be AC voltage to the crane, the _ circuit usually contains 1282535 15239twf. doc / cf bridge j DC / AC converter and transformer, even in order to stabilize the lamp exemption must also have Feedback control device. In order to reduce the cost, some use one drive circuit to drive two or more lamps, which can reduce half or more drive f' but the feedback control for each lamp is Is more Accurate' and the drive circuit needs a higher power than the original fan out. ^ In addition, when the motion picture is played back on the LCD, the outline of the image may be blurred, or the picture may appear. There are cases of dragging and residual images. This problem is generally caused by the reaction time of the liquid crystal display not being fast enough. The solution is to improve the reaction time of the liquid crystal display, and the other is to imitate the display principle of the conventional cathode ray tube. The sweeping cat type (the modest backlight mode, and the backlight of the liquid crystal display II is a continuous lighting mode in the integral behavior mode of the human eye, which causes the edge of the human eye to be blurred when the motion picture is played. Image, while cathode ray tube is a pulse
(pulse)發光模式，利用電子搶掃瞎並在其掃過的地方才發 光。 X 在習知，掃瞒式背光模組技術中’以一個驅動電路來 ΐΐι根燈管，再利用控制單元根據液晶顯示面板的掃瞄 、、y彳工制所有的驅動電路逐一點亮所有的燈管，以模仿 官的發光模式，這種方法簡單明瞭但成本較 面。，來’就是以一個驅動電路來驅動數根燈管，再利 控=來控制所有驅動電路以「循序」點亮所有的燈管， 成本較低’但是此「循序」卻是先點亮由第 / 路所控制的數根燈光，再點亮由第二個驅動電 1282535 15239twf.doc/c 路所控制的數根燈光，以此類推，因此並不是逐一點燈， 而且逛是沒㈣域蝴㈣獨準 驅動電路之問題揭雜何解決的手段。&辣门力丰的 【發明内容】 置，3=一目的就是在提供一種掃描式背光源驅動裝(pulse) illuminating mode, using an electronic blasting broom and emitting light where it is swept. X In the conventional, broom-type backlight module technology, 'one drive circuit is used to illuminate the lamp, and then the control unit illuminates all the drive circuits one by one according to the scanning of the liquid crystal display panel and the y彳 system. The lamp is used to imitate the official lighting mode. This method is simple and straightforward but cost-effective. , 'is to drive a number of lamps with a drive circuit, and then control = to control all the drive circuits to "light up" all the lamps, the cost is lower 'but this "sequence" is first lit by The number of lights controlled by the first / road, and then the lights that are controlled by the second drive 1282535 15239twf.doc / c road, and so on, so not a little light, and the shopping is not (four) domain Butterfly (4) The problem of the independent drive circuit is unclear. &Spice Gate Lifeng [Invention] Set, 3 = one purpose is to provide a scanning backlight drive
顯干點t背光源中多數個光源，用以改善液晶 =裝置旦面顯不的效果，消除畫像在移動時所產生的殘 F置本艾目的就是在提供—種掃描式背光源驅動 2此裝L、需-個驅動單元即可驅動背光源中多數個 ς ’用以降低成本，再配合開關單元即可逐—點亮該些 无源。 本U的再-目的就是在提供—種掃描式背光源驅動 二 此裝置可以將控制逐一點燈的開關單元配置在背光 、的低電壓i以降低功率消耗並提高安全性。 本發明的又一目的就是在提供一種掃描式背光源驅動 曰I去-，用逐一點亮背光源中多數個光源的方式，改善液 曰 =·、、、員不裝置畫面顯示的效果，消除畫像在移動時所產生的 殘像。 一 一 t發明提出一種掃描式背光源驅動裝置，包括驅動單 f夕月光源、開關單元以及掃描控制單元，其中背光源包 舌二數個光源。驅動單元具有第一端以及第二端，用以提 =電源’而背光源中每一個光源皆具有第一端以及第二 立而’且每一個光源之第一端耦接驅動單元之第一端；開關 7 1282535 15239twf.doc/c 單元則輕接於驅動單分一 之間，且開關單元根 及個光源之第二端 號，決定驅動單元第—k/ 二工制單元所接收的控制訊 掃描控制單元則:二關個先源之第二端是否連 單元帛以逐-點亮該些光源 輪出控制訊號給開關 二端的切、之第一端的電壓高於每-個光源之第 依照本發明的較佳實施例所述 置:其㈣些光源可以是冷陰極勞光燈=== 須提供父流電源至這些冷陰極螢光燈。 ’、 本發明的較佳實施例所述之掃描式背光源驅動裝 置’，、中該些光源亦可以是發光二極體陣列，此時驅動單 =必須提供直流電源至這些發光二極體陣列。此外，發光 -極體_包括紅色發光二極體'綠色發光二極體以及藍 光一極體，用以混光產生白光，因此，需要驅動單元 提供三個不同準位之直流電源分別纽色發光二極體、綠 色發光二極體以及藍色發光二極體。 依照本發明的較佳實施例所述之掃描式背光源驅動裝 置’其中開關單元可以是由金氧半電晶體所實現之開關， 亦可以是由雙載子電晶體所實現之開關。 本發明提出一種掃描式背光源驅動方法，其中背光源 包括多數個光源，且該些光源耦接開關單元，此掃描式背 1282535 15239twf.doc/c 控制開關單元利用電源逐 光源驅動方法包括：提供電源； 一點亮該些光源。 、依照本發明的較佳實施例所述之掃描式背光源驅動方 法、，其中在每-個光源之高電壓端提供電源，而在每—個 光源之低電壓端’控侧關單元利用電源逐―點亮該些光 源。 一 —為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說 明如下。 ° 【實施方式】 為使本發明之實施說明能更加清楚，以下開關單元中 之開關以由雙載子電晶體組成的開關為例，凡熟悉此技藝 者應可輕易類推至其他開關。 = 圖1係依照本發明一較佳實施例所繪示之掃瞄式冷陰 極螢光燈驅動裝置。請參照圖i，此掃瞄式冷陰極螢 驅動裝置包括驅動單元100、背光源11〇、開關單元12^ • 以及掃猫控制單元130。其中，背光源110包括多數個冷 陰極螢光燈111、112以及113 ;開關單元120則包括多^ 個開關121、122、123,以及避免開關形成短路的電阻Ru、 R12、R13。另外，驅動單元1〇〇可能包括直流電壓源、橋 式直流/交流轉換器、變壓器、電容以及迴授控制星 未繪示於圖中。 = 一般由冷陰極螢光燈所構成的背光源採用燈管並聯的 方式，如圖1所示，冷陰極螢光燈m、112、U3互相平 1282535 15239twf.doc/c 3二Ϊ動單元1GG之第—端提供高壓的交流電源分別 =極營光燈⑴〜113之第一端(高電壓端)，而開關單 以及^接於冷陰極縣燈111〜113之第二端(低電壓端） 以及驅動早元100之第二端之間。 舉例來說，如果掃瞒控制單元130輸出一控制訊號， W中只有„ 121導通_，其餘的開關 因Li 則背光源11G中只有冷陰極螢光燈出 口為形成一個迴路(即驅動單元100至冷陰極螢光燈^， 以及開關121 ’最後由開關121回到驅動單 = i〇〇)而有電流通過’亦即只有冷陰極螢光燈ui會發 於、rr冷陰極螢紐均不發光。接著，_控制單元 3〇輸出另-個控制訊號，使得開關單元12〇中 導通’其餘的開關均不導通，則f光源110中只有 :陰=絲m會發光，其餘的冷陰極螢光燈均不發 ί，可以利用掃猫控制單元130不斷地輸出不 ’使得背光源11()中的冷陰極榮光燈逐一被 二液ί顯示震置晝面顯示的效果，-般掃猫 =早兀m茜配合液晶顯示面板的掃瞒速率來逐一點亮 此外，由於同一時間只有少數幾根燈管發光， 不會造成功率損耗，驅動單元咖並衫因 為並聯更4燈管而需錢大的輸㈣率。而且 ==榮ίΓ1〜113低電壓端進行開關切‘ 才工制❿不疋在南電堡進行開關切換的控制，這樣除了功 1282535 15239twf.doc/c 率消耗比較少之外，整個裝置的操作也較安全。甚至，在 ，授控制之脈波寬度調變時，會有部分時間燈管並不會 党，可以取這段時間的_小部分(例如5%)來做開關切換的 動作，使整個裝置操作更加安全。 圖2係依照本發明另一較佳實施例所繪示之掃瞄式冷 陰極或光燈驅動装置。請參照圖2，此掃冷陰極榮光 燈驅動裝置包括驅動單元2()1〜2()3、背光源21()、開關單 凡220以及掃瞄控制單元23〇。其中，背光源21〇包括多 數個冷陰極螢光燈211〜216;關單元22G則包括多數個 開關221〜223，以及避免開關形成短路的電阻R21〜R26。 驅動單元201同時提供電源至冷陰極螢光燈211、 214 ’配合開關221決定這兩根燈管何者形成導通迴路(未 、、、曰出）而务7C ’驅動單元2〇2同時提供電源至冷陰極螢光燈 212、215，配合開關222決定這兩根燈管何者形成導通迴 路(未繪出）而發亮；驅動單元203同時提供電源至冷陰極 螢光燈213、216，配合開關223決定這兩根燈管何者形成 導通迴路(未繪出）而發亮。最後，再由掃瞄控制單元23〇 發出控制訊號控制開關221〜223達成逐一點亮冷陰極勞光 燈211〜216的工作。 V右 明顯地，此裝置之背光源並不限於六根燈管，可以更 多或更少根燈管，甚至可以一個驅動單元提供電源至三根 或更多根燈管，亦即整個裝置所用到的驅動單元更少了^ 事實上’驅動單元201、冷陰極螢光燈211與214、開關 221以及掃瞄控制單元230這種組成，就是圖i裝置二二 11 1282535 15239twf.doc/c 種實施例，他們的特徵皆是一個驅動單元提供電源至多數 個冷陰極螢光燈，而這些冷陰極螢光燈的發亮與否則由受 控於掃瞄控制單元的開關單元所決定。 圖3係依照本發明一較佳實施例所繪示之掃瞄式發光 二極體陣列驅動裝置。請參照圖3，此掃瞄式發光二極體 陣列驅動裝置包括驅動單元3〇〇、背光源31〇、開關單元 320以及掃瞄控制單元33〇。其中，驅動單元3〇〇包括紅色 φ 發光二極體驅動單元301、綠色發光二極體驅動單元3〇2 與藍色發光二極體驅動單元303 ;背光源31〇包括多數個 ’ 發光二極體陣列之光源311〜313;開關單元32〇包括多數 個開關321〜323，以及避免開關形成短路的電阻R3丨〜们3。 此裝置與工作原理相當類似圖丨之裝置，不同處在於 背光源310中之光源311〜313係發光二極體陣列之光源，、 而非圖1之冷陰極螢光燈，此外，為了混成白光，每一個 發光二極體陣列之光源311〜313皆需要紅色、綠色與藍色 二種發光二極體陣列，因此需要提供三種不同電壓準位之 ^ 直流電源。所以，以一個紅色發光二極體驅動單元301提 供電源至所有光源311〜313中的紅色發光二極體，以一個 綠色發光二極體驅動單元302提供電源至所有光源 〜313中的綠色發光二極體，以一個藍色發光二極體驅 動單元303提供電源至所有光源311〜313中的藍色發光二 =。最後，再鱗單元_發出控制訊號控制開 關早7L 320達成逐一點亮發光二極體陣列之光源31丨〜 12 I282535 l5239twf.(l〇c/c 然而’彳If猫式發光一極體陣列之光源的設計方法不一 定要如圖3所示之並聯方式，亦可以設計成串聯方式，這 樣可以更有效的控制流過光源之電流。圖4係依照本發= 另一較佳實施例所繪示之掃瞄式發光二極體陣列驅^裝 置。請參照圖4，為說明簡單起見，本實施例以串聯四才^ ^光一極體陣列之光源為例，凡熟悉此藝者應可輕易類推 至更多根光源。 、 鲁 此裝置包括驅動單元400、發光二極體陣列之光源 411〜414、開關421〜431以及掃瞄控制單元(未繪出）。其 中’發光二極體陣列之光源411〜414組成一背光源；開關 421〜431組成開關單元，此外，驅動單元需要提供三種不 同位準之直流電源分別至光源411〜414中的紅色、綠色與 I色發光一極體。最後，再由掃瞒控制單元發出控制訊號 控制開關421〜431達成逐一點亮光源411〜414的工作。例 如：當開關42卜423、425、428、431皆導通，且開關422、 424、426、427、429、430皆不導通時，只有光源411會 ® 發亮，光源412、413與414皆不發亮；而在開關422、423、 424、426、428、431 皆導通，且開關 42卜 425、427、429、 430皆不導通時，只有光源412會發亮，光源411、413與 414皆不發亮。 圖5係依照本發明一較佳實施例所繪示之掃描式背光 源驅動方法的流程圖。首先，在步驟S51〇提供一電源； 再來，在步驟S520控制開關單元利用電源逐一點亮這些 光源。 13 1282535 圖6係依照本發明另一較佳實施例所繪示之掃描式背 光源驅動方法的流程圖。首先，步驟s61〇在光源之高電 壓立而提供一電源；再來，步驟S62〇在光源之低電壓端控 制開關單元利用電源逐一點亮這些光源。Most of the light sources in the backlight t-light source are used to improve the effect of the liquid crystal=device surface, and eliminate the residual F generated by the image when moving. The purpose is to provide a scanning backlight drive. Install L, need a drive unit to drive most of the backlights 用以 'to reduce costs, and then with the switch unit can light up the passive. The purpose of this U is to provide a scanning type backlight drive. This device can be configured to control the switch unit of one-by-one lamp in the backlight, low voltage i to reduce power consumption and improve safety. Another object of the present invention is to provide a scanning backlight driving 曰I to-, and to illuminate a plurality of light sources in the backlight one by one to improve the effect of liquid 曰=·,,, The afterimage produced by the portrait while moving. The invention provides a scanning backlight driving device comprising a driving unit, a switching unit and a scanning control unit, wherein the backlight comprises a plurality of light sources. The driving unit has a first end and a second end for raising a power source, and each of the light sources in the backlight has a first end and a second end and the first end of each light source is coupled to the first of the driving units The switch 7 1282535 15239twf.doc/c unit is lightly connected to the drive unit, and the switch unit root and the second end of the light source determine the control received by the drive unit first-k/second working unit. The scanning control unit is: the second end of the second source is connected to the unit to illuminate the light source to control the signal to the second end of the switch, and the voltage of the first end is higher than that of each of the light sources. According to a preferred embodiment of the present invention, the (four) light sources may be cold cathode discharge lamps === a parent flow power supply to these cold cathode fluorescent lamps is required. In the scanning backlight driving device of the preferred embodiment of the present invention, the light sources may also be LED arrays. In this case, the driving unit must provide DC power to the LED arrays. . In addition, the light-emitting body _ includes a red light-emitting diode 'green light-emitting diode and a blue light-emitting body for mixing light to generate white light. Therefore, the driving unit is required to provide three different levels of direct current power supply respectively. A diode, a green LED, and a blue LED. A scanning backlight driving device according to a preferred embodiment of the present invention, wherein the switching unit may be a switch implemented by a MOS transistor or a switch implemented by a bipolar transistor. The invention provides a scanning backlight driving method, wherein the backlight comprises a plurality of light sources, and the light sources are coupled to the switch unit. The scanning back 1282535 15239 twf.doc/c control switch unit utilizes a power source-by-light source driving method including: providing Power; a light source. A scanning backlight driving method according to a preferred embodiment of the present invention, wherein power is supplied at a high voltage end of each light source, and a power supply is used at a low voltage end of each light source. Light up the light sources one by one. The above and other objects, features, and advantages of the present invention will become more apparent from the understanding of the appended claims appended claims [Embodiment] In order to make the implementation of the present invention clearer, the switches in the following switching units are exemplified by switches composed of bipolar transistors, and those skilled in the art should be able to easily analogize to other switches. 1 is a scanning cold cathode fluorescent lamp driving device according to a preferred embodiment of the present invention. Referring to FIG. 1, the scan type cold cathode fluorescent driving device includes a driving unit 100, a backlight 11A, a switch unit 12^, and a sweeping cat control unit 130. The backlight 110 includes a plurality of cold cathode fluorescent lamps 111, 112, and 113. The switching unit 120 includes a plurality of switches 121, 122, and 123, and resistors Ru, R12, and R13 that prevent the switches from forming short circuits. In addition, the drive unit 1〇〇 may include a DC voltage source, a bridge DC/AC converter, a transformer, a capacitor, and a feedback control star not shown. = The backlight consisting of cold cathode fluorescent lamps adopts the parallel connection of lamps. As shown in Figure 1, the cold cathode fluorescent lamps m, 112 and U3 are flat with each other. 1282535 15239twf.doc/c 3 two turbulence units 1GG The first end of the high-voltage AC power supply = the first end of the camping light (1) ~ 113 (high voltage end), and the switch single and ^ connected to the second end of the cold cathode county lights 111 ~ 113 (low voltage end ) and drive between the second end of the early 100. For example, if the broom control unit 130 outputs a control signal, only „121 is turned on in the W, and the remaining switches are only a cold cathode fluorescent lamp outlet in the backlight 11G due to Li to form a loop (ie, the driving unit 100 to The cold cathode fluorescent lamp ^, and the switch 121' is finally returned to the driving unit by the switch 121 = i〇〇) and there is current passing through, that is, only the cold cathode fluorescent lamp ui will be emitted, and the rr cold cathode fluorescent lamp will not emit light. Then, the _ control unit 3 outputs another control signal, so that the switch unit 12 turns "the rest of the switches are not turned on, then only the f light source 110: the negative = the wire m will emit light, and the remaining cold cathode fluorescent light The lights are not sent, and the sweeping cat control unit 130 can be continuously outputted so that the cold cathode glory light in the backlight 11() is displayed by the two liquids one by one, and the sweeping cat = early兀m茜 is matched with the broom rate of the liquid crystal display panel to illuminate one by one. In addition, since only a few lamps are illuminated at the same time, power loss is not caused, and the drive unit is more expensive because of the parallel connection of 4 lamps. Lose (four) rate. And == Rong Γ1~113 low voltage end switch-cutting's work system is not in the control of switching switch in Nandian Fort, so the operation of the whole device is safer except that the power consumption of 1282535 15239twf.doc/c is relatively small. Even when the pulse width of the control is adjusted, there will be some time when the lamp does not have a party. You can take the _ small part (such as 5%) of this time to do the switching action, so that the whole device can operate. Figure 2 is a scanning cold cathode or light lamp driving device according to another preferred embodiment of the present invention. Referring to Figure 2, the chilled cathode glory driving device includes a driving unit 2 (1) ~2 () 3, backlight 21 (), switch unit 220 and scan control unit 23 〇. Among them, the backlight 21 〇 includes a plurality of cold cathode fluorescent lamps 211 to 216; the off unit 22G includes a plurality of switches 221 to 223, and resistors R21 to R26 that prevent the switch from forming a short circuit. The driving unit 201 simultaneously supplies power to the cold cathode fluorescent lamps 211, 214 'the switch 221 determines which of the two lamps forms a conduction loop (not, ,, 曰Out) 7C 'Drive unit 2 2 simultaneously providing power to the cold cathode fluorescent lamps 212, 215, with the switch 222 determining which of the two lamps forms a conduction loop (not shown) to illuminate; the driving unit 203 simultaneously supplies power to the cold cathode fluorescent lamp 213, 216, the switch 223 determines whether the two lamps form a conduction loop (not shown) and illuminates. Finally, the scan control unit 23 sends out the control signal control switches 221 to 223 to achieve one-on-one illumination of the cold cathode The operation of the lamps 211 to 216. V rightly, the backlight of the device is not limited to six lamps, more or less lamps, and even one drive unit can supply power to three or more lamps. That is to say, the driving unit used in the whole device is less ^ in fact, the composition of the driving unit 201, the cold cathode fluorescent lamps 211 and 214, the switch 221 and the scanning control unit 230, that is, the device i 22 21 1282535 15239twf .doc/c embodiments, which are characterized in that one drive unit supplies power to a plurality of cold cathode fluorescent lamps, and the illumination of these cold cathode fluorescent lamps is otherwise controlled by the scanning control unit. Decision means. 3 is a scanning type LED array driving device according to a preferred embodiment of the present invention. Referring to FIG. 3, the scan type LED array driving device includes a driving unit 3A, a backlight 31A, a switching unit 320, and a scanning control unit 33A. The driving unit 3 includes a red φ LED driving unit 301, a green LED driving unit 3〇2 and a blue LED driving unit 303; and the backlight 31 includes a plurality of LEDs. The light sources 311 to 313 of the body array; the switch unit 32A includes a plurality of switches 321 to 323, and resistors R3 to 3 which prevent the switches from forming short circuits. The device is similar to the working principle, and the difference is that the light sources 311 to 313 in the backlight 310 are light sources of the LED array, instead of the cold cathode fluorescent lamp of FIG. 1 , in addition, in order to mix white light Each of the light source 311 to 313 of the LED array needs two arrays of red, green and blue LEDs, so it is necessary to provide three different voltage levels of DC power. Therefore, a red LED driver unit 301 is supplied with power to the red LEDs of all of the light sources 311 to 313, and a green LED driver unit 302 is used to supply power to all of the light sources 313. In the polar body, a blue light-emitting diode driving unit 303 supplies power to the blue light-emitting two of all the light sources 311 to 313. Finally, the re-scale unit _ sends out the control signal control switch 7L 320 to achieve the light source of the LED array one by one. 31丨12 I282535 l5239twf. (l〇c/c However, '彳If cat type LED array The design method of the light source does not have to be in parallel mode as shown in FIG. 3, and can also be designed in series mode, so that the current flowing through the light source can be more effectively controlled. FIG. 4 is drawn according to another preferred embodiment of the present invention. The scanning type LED array driving device is shown in Fig. 4. For the sake of simplicity, the present embodiment takes a light source of a series of four-pole optical arrays as an example, and anyone familiar with the art should be able to It is easy to analogize to more light sources. The device includes a driving unit 400, light sources 411 to 414 of the LED array, switches 421 to 431, and a scanning control unit (not shown). The light sources 411 to 414 constitute a backlight; the switches 421 to 431 constitute a switching unit, and in addition, the driving unit needs to provide three different levels of DC power to the red, green and I color light emitting bodies in the light sources 411 to 414, respectively. At last Then, the control signal control switches 421 to 431 are issued by the broom control unit to achieve the operation of lighting the light sources 411 to 414 one by one. For example, when the switches 42 423, 425, 428, and 431 are all turned on, and the switches 422, 424, 426, and 427 are turned on. When 429 and 430 are not turned on, only the light source 411 will light up, and the light sources 412, 413 and 414 will not light up; and the switches 422, 423, 424, 426, 428, 431 are all turned on, and the switch 42 425 When the 427, 429, and 430 are not turned on, only the light source 412 is illuminated, and the light sources 411, 413, and 414 are not illuminated. FIG. 5 is a scanning backlight driving method according to a preferred embodiment of the present invention. First, a power supply is provided in step S51. Then, the switch unit is controlled to light the light sources one by one in step S520. 13 1282535 FIG. 6 is a scanning according to another preferred embodiment of the present invention. Flowchart of the backlight driving method. First, step s61 立 provides a power source at a high voltage of the light source; and then, step S62 控制 controls the switching unit to illuminate the light sources one by one with the power source at the low voltage end of the light source.
綜上所述，本發明提供一種掃描式背光源驅動裝置及 方法，係以一個驅動單元提供電源，再根據掃描控制單元 所送出的控制訊號，控制開關單元決定是否將提供至該些 • 杨的電源導通’以逐—點亮這些光源，這樣可以改善液 【圖式簡單說明】In summary, the present invention provides a scanning backlight driving device and method, which provides power supply by a driving unit, and then controls a switching unit to determine whether to provide to the Yang according to a control signal sent by the scanning control unit. The power supply is turned on to illuminate these light sources one by one, which can improve the liquid [simplified description of the drawing]
=3係依照本發明—較佳實施例轉示之掃瞒式發光 雖然本發明已以較佳實施例揭露如上，然其並非用以 =本發明，任何熟習此技藝者，在不_本發明之精神 和乾圍内’當可作些許之更動與潤飾，因此本發明之保 範圍當視後附之申請專利範圍所界定者為準。 幸乂t κ知例所緣示之掃瞄式發 圖4係依照本發明另一 光二極體陣列驅動裝置。 14 I282535_/c 圖5係依照本發明一較佳實施例所繪示之掃瞄式背光 源驅動方法的步驟流程圖。 圖6係依照本發明另一較佳實施例所繪示之掃瞄式背 光源驅動方法的步驟流程圖。 【主要元件符號說明】 S510〜S520 :依照本發明一較佳實施例所繪示之掃瞄 式背光源驅動方法的各個步驟流程 S610〜S620 :依照本發明另一較佳實施例所繪示之掃 瞄式背光源驅動方法的各個步驟流程 100、201 〜203、300、400 ·•驅動單元 301 :紅色發光二極體驅動單元 302 :綠色發光二極體驅動單元 303 :藍色發光二極體驅動單元 110、210、310:背光源 111〜113、211〜216 :冷陰極螢光燈(光源） 311〜313、411〜414 :發光二極體陣列（光源） 120、220、320 :開關單元 121 〜123、221 〜223、321 〜323、421 〜431 ··開關 130、230、330 ·掃瞒控制單元 R11 〜R13、R21 〜R26、R31 〜R33 ··電阻 15</ RTI> </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The spirit and scope of the invention may be changed and retouched. Therefore, the scope of the invention is defined by the scope of the patent application. Fortunately, the scanning type shown in Fig. 4 is another photodiode array driving device according to the present invention. 14 I282535_/c FIG. 5 is a flow chart showing the steps of a scanning backlight driving method according to a preferred embodiment of the present invention. FIG. 6 is a flow chart showing the steps of a method for driving a scanning backlight according to another preferred embodiment of the present invention. [Big Element Symbol Description] S510~S520: Steps S610 to S620 of the stepping backlight driving method according to a preferred embodiment of the present invention: according to another preferred embodiment of the present invention Steps 100, 201 to 203, 300, 400 of the scanning backlight driving method · Driving unit 301: red LED driving unit 302: green LED driving unit 303: blue LED Driving units 110, 210, 310: backlights 111 to 113, 211 to 216: cold cathode fluorescent lamps (light sources) 311 to 313, 411 to 414: light emitting diode arrays (light sources) 120, 220, 320: switching units 121 to 123, 221 to 223, 321 to 323, 421 to 431 ··Switches 130, 230, 330 ·Broom control units R11 to R13, R21 to R26, R31 to R33 · Resistor 15