201024864 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種背光模組及顯示裝置。 【先前技術】 目前常見之顯示裝置一般皆具有一顯示面板及一背 光模組，而背光模組係具有複數個例如為冷陰極螢光燈管 (CCFL )的發光單元。然而，隨著顯示面板的尺寸曰漸增 大，背光模組所需的燈管數量也隨之增加。 一般而言，為了避免因燈管異常或故障而導致驅動燈 管發光的換流器損壞，傳統的保護方式係在每根燈管電性 連接一保護電路。因此，傳統保護方式勢必需要相當多的 元件才能達到保護功能，為此整體驅動系統的設計成本亦 不斷提高。 請參照圖1所示，其為一種習知背光模組1的架構示 意圖。背光模組1係為雙邊驅動之背光模組，其主要包含 複數發光單元10以及二驅動單元111及112。其中，驅動 單元111係與發光單元10之一第一端101相互電性連接， 而驅動單元112係與發光單元10之一第二端102相互電 性連接。驅動單元111及驅動單元112係分別具有複數換 流器以分別輸出正高壓及負高壓來驅動發光單元10發光。 此種雙邊驅動設計之目的是為了避免過長的燈管產 生亮度不均的問題，然而雙邊驅動設計即代表著需要更多 的換流器，因而會增加成本。 6 201024864 請再參照圖2所示，另一種習知背光模組2的架構示 意圖。背光模組2具有複數發光單元20、複數驅動單元 21、複數偵測單元22以及複數保護單元23。其中，各驅 動單元21可具有一組換流器以驅動對應的發光單元20， . 且每一發光單元20亦電性連接一組偵測單元22及保護單 元23。發光單元20之一端係電性連接驅動單元21，而各 發光單元20之另一端係相互電性連接。其保護機制為當 任一發光單元20發生異常或故障等情況時，偵測單元22 所偵測到之電壓將會變大2至4倍，藉此即可產生迴授訊 號給保護單元來達到保護功能。相同地，由於每一發光單 元皆需要一組偵測單元及保護單元，也將會增加成本。 因此，如何提供一種可降低電路的設計成本及複雜度 之具有偵測及保護控制功能之背光模組及顯示裝置，實屬 當前重要課題之一。 φ 【發明内容】 有鑑於上述課題，本發明之目的為提供一種能夠簡化 設計結構，且能有效降低成本之具有偵測及保護控制功能 之背光模組及顯示裝置。 為達上述目的，依據本發明之一種背光模組，其係包 含複數發光單元、一驅動單元、一偵測單元以及一保護控 " 制單元。各該等發光單元分別具有一第一端及一第二端， 各發光單元之第二端係相互電性連接；驅動單元與該等發 光單元之該等第一端電性連接，並輸出複數驅動訊號以分 7 201024864 別驅動該等發光單元；偵測單元係與該等發光單元之該等 第二端電性連接，以擷取一偵測訊號並據以輸出一迴授訊 號；保護控制單元係分別與偵測單元及驅動單元電性連 接，並依據迴授訊號輸出一保護訊號至驅動單元。 為達上述目的，依據本發明之一種顯示裝置，其係包 含一顯示面板以及一背光模組。該背光模組與顯示面板相 對設置，並包含複數發光單元、一驅動單元、一偵測單元 以及一保護控制單元。各發光單元分別具有一第一端及一 第二端，且各發光單元之第二端係相互電性連接；驅動單 元與該等發光單元之該等第一端電性連接，並輸出複數驅 動訊號以分別驅動該等發光單元；偵測單元與該等發光單 元之該等第二端電性連接，以擷取一偵測訊號並據以輸出 一迴授訊號；保護控制單元分別與偵測單元及驅動單元電 性連接，並依據迴授訊號輸出一保護訊號至驅動單元。 承上所述，本發明之顯示裝置及背光模組係將各發光 單元之一端串接，並利用一個偵測單元偵測且擷取於此端 之電壓變化或電流變化以作為偵測訊號，並據以輸出迴授 訊號傳送至保護控制單元，以產生一保護訊號至驅動單元 來啟動保護功能，因而可有效降低電路的設計成本及複雜 度。 【實施方式】 以下將參照相關圖式，說明依據本發明較佳實施例之 一種背光模組及顯示裝置。 201024864 請參照圖3及圖4所示，其為本發明較佳實施例之一 種背光模組3之示意圖。首先參照圖3，其為本發明較佳 實施例之一種背光模組3的剖面示意圖，背光模組3包含 複數發光單元30、一背板34以及一電路板（圖未示）。該 . 等發光單元30係與背板34之一反射面341相對設置，並 藉由至少一支撐元件（圖未示）而設置於背板34之上。 電路板可設置於與背板34相對於反射面341之另一面， 或係設置於背板34之側面，於此並不加以限制。另外， • 背板34係可為金屬背板，其係作為一接地端。 請再參照圖4所示，本發明較佳實施例之背光模組3 更包含一驅動單元31、一偵測單元32以及一保護控制單 元33。在此所述之驅動單元31、偵測單元32以及保護控 制單元33係設置於如上所述之電路板上。 繼續參照圖4所示，各該等發光單元30分別具有一 第一端301及一第二端302，且各發光單元30之第二端 φ 302係相互電性連接。在本實施例中，發光單元30係可為 螢光燈管，其例如可為冷陰極螢光燈管（CCFL)、熱陰極 螢光燈管（HCFL)或外部電極螢光燈管（EEFL)。 驅動單元31分別與該等發光單元30之該等第一端 301電性連接，並輸出複數驅動訊號以分別驅動該等發光 單元30。在本實施例中，驅動單元31係可具有複數換流 器（inverter)以分別輸出正高壓驅動訊號或負高壓驅動訊 號，並據以驅動該等發光單元30發光。換流器係可包含 開關電路以及升壓電路（圖未示），藉由開關電路的切換 9 201024864 動作，以使升壓電路輸出高壓交流電。其中，開關電路係 可由例如為電晶體之開關元件所組成，而升壓電路係可由 例如變壓器所組成。 偵測單元32與該等發光單元30之該等第二端302電 性連接，以擷取一彳貞測訊號並據以輸出一迴授訊號SF。在 _ 本實施例中，彳貞測訊號係可為電壓訊號或電流訊號，其並 不加以限制，端看整體架構所需及偵測單元之能力。換言 之，偵測單元32係可為電壓偵測單元或電流偵測單元。 保護控制單元33係分別與偵測單元32及驅動單元31 電性連接，並依據迴授訊號SF輸出一保護訊號SP至驅動 單元31。在本實施例中，保護訊號SP係可為預設的脈衝 寬度調變（PWM)訊號以使驅動單元31不致於繼續輸出 過大功率的驅動訊號；或係可為強制關閉訊號以關閉驅動 單元31而不再繼續輸出驅動訊號。 上述之各發光單元30之該等第二端302係以浮接方 ❿ 式（floating)相互電性連接，且與發光單元30電性連接 之各單元並未與金屬背板為共地，以避免因該等發光單元 30輸出訊號所產生的雜訊經由金屬背板34之傳導作用， 進而影響背光模組3之整體系統的正常運作。 以下將再配合相關圖式，以詳細說明偵測單元32以 及保護控制單元33。 請參照圖5A所示，其為顯示偵測單元32的一種態樣 之電路架構示意圖。其中偵測單元32具有相互電性連接 之分壓電路、整流電路以及放大器。由於一般的保護控制 10 201024864 單元33無法接收驅動發光單元30之高壓的驅動訊號，因 此，藉由偵測單元32可將較為高壓的偵測訊號轉換為較 為低壓的回授訊號SF而輸出至保護控制單元33，以供其 後續的作動。 . 另外，請參照圖5B所示，其為顯示偵測單元32之另 一種態樣之電路架構示意圖。其中偵測單元32具有相互 電性連接之訊號轉換電路以及整流電路。其中，訊號轉換 電路例如係利用變壓器將較為高壓的偵測訊號作降壓的 β 動作，並經由整流電路而輸出較為低壓的迴授訊號SF。其 與上述之偵測單元32所欲達到的目的皆相同，故於此不 再加以贅述。 值得一提的是，上述係以背光模組3中僅具有一組偵 測單元32及保護控制單元33為例說明。然而，為了因應 尺寸曰漸增大的背光模組，其亦可再增加多組的偵測單元 及保護控制單元，主要係保持一組偵測單元及保護控制單 φ 元對應複數發光單元為原則。 接著請參照圖6所示，其為依據本發明較佳實施例之 一顯示裝置4的示意圖。顯示裝置4包含一顯示面板40 以及一與顯示面板40相對設置之背光模組41。 背光模組41包含複數發光單元、一驅動單元、一镇 測單元以及一保護控制單元。各該等發光單元分別具有一 ' 第一端及一第二端，且各發光單元之第二端係相互電性連 接。驅動單元係與該等發光單元之該等第一端電性連接， 並輸出複數驅動訊號以分別驅動該等發光單元。偵測單元 11 201024864 係與該等發光單元之兮 訊號並據以輸出、迴叫以擷取， 單元及驅料㈣早讀與债測 號至驅動單元。纟’並依心授喊輸出—保護訊 由於顯示裝复4中夕办土播& 之元件41與前述之背光模組3 件㈣力〜自相同，於本文中將不再贅述。 …综上St本發明之顯示裝置及背光模組係將各發光 ，並利用一㈣測單元偵測且擷取於此端 替傳，並細輸出迴授 ==!: ’以產生1護訊號至驅動單元 ^動保n而可有效降低電路的設計成本及複雜 度。 太：上舉例性’而非為限制性者。任何未脫離 :明之:神4疇’而對其進行之等效均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 =種習知背光模組的架構示意圖； 二T種習知背光模組的架構示意圖； 示意^; 發明較佳實施例之—種背光模組的别面 示意=為依據本發明較佳實施例之—種背光模組的架構 圖从為依據本發明較佳實施例之背光模組的偵測單 12 201024864 元的電路架構示意圖； 圖5B為依據本發明較佳實施例之背光模組的偵測單 元之另一電路架構示意圖；以及 圖6為依據本發明較佳實施例之一種顯示裝置的示意 . 圖。 【主要元件符號說明】 1、2、3、41 :背光模組 ® 10、20、30 :發光單元 101、 301 :第一端 102、 302 :第二端 111、112、21、31 :驅動單元 22、32 :偵測單元 23 :保護單元 33 :保護控制單元 參 34 ·背板 341 :反射面 4 :顯示裝置 40 :顯示面板 SF :迴授訊號201024864 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module and a display device. [Prior Art] At present, a conventional display device generally has a display panel and a backlight module, and the backlight module has a plurality of light-emitting units such as a cold cathode fluorescent lamp (CCFL). However, as the size of the display panel increases, the number of lamps required for the backlight module also increases. In general, in order to avoid damage to the inverter that drives the lamp to illuminate due to an abnormality or malfunction of the lamp, the conventional protection method is to electrically connect a protection circuit to each of the lamps. Therefore, the traditional protection method requires a considerable number of components to achieve the protection function, and the design cost of the overall drive system is also increasing. Please refer to FIG. 1 , which is a schematic diagram of a conventional backlight module 1 . The backlight module 1 is a bilaterally driven backlight module, which mainly includes a plurality of light emitting units 10 and two driving units 111 and 112. The driving unit 111 is electrically connected to the first end 101 of the light emitting unit 10, and the driving unit 112 is electrically connected to the second end 102 of the light emitting unit 10. The driving unit 111 and the driving unit 112 respectively have a plurality of inverters to respectively output a positive high voltage and a negative high voltage to drive the light emitting unit 10 to emit light. The purpose of this bilateral drive design is to avoid the problem of uneven brightness caused by long lamps. However, the bilateral drive design means that more inverters are needed, which increases the cost. 6 201024864 Please refer to FIG. 2 again for another schematic diagram of the structure of the conventional backlight module 2. The backlight module 2 has a plurality of light emitting units 20, a plurality of driving units 21, a plurality of detecting units 22, and a plurality of protecting units 23. Each of the driving units 21 can have a set of inverters to drive the corresponding lighting units 20, and each of the lighting units 20 is also electrically connected to a group of detecting units 22 and protection units 23. One end of the light emitting unit 20 is electrically connected to the driving unit 21, and the other ends of the respective light emitting units 20 are electrically connected to each other. The protection mechanism is that when any one of the light-emitting units 20 is abnormal or faulty, the voltage detected by the detecting unit 22 will be increased by 2 to 4 times, thereby generating a feedback signal to the protection unit. Protective function. Similarly, since each lighting unit requires a set of detecting units and protection units, it will also increase the cost. Therefore, how to provide a backlight module and a display device with detection and protection control functions that can reduce the design cost and complexity of the circuit is one of the current important topics. [Explanation] In view of the above problems, an object of the present invention is to provide a backlight module and a display device having a detection and protection control function which can simplify the design and can effectively reduce the cost. To achieve the above objective, a backlight module according to the present invention includes a plurality of light emitting units, a driving unit, a detecting unit, and a protection control unit. Each of the light-emitting units has a first end and a second end, and the second ends of the light-emitting units are electrically connected to each other; the driving unit is electrically connected to the first ends of the light-emitting units, and outputs a plurality of The driving signal is driven by the light-emitting units in the manner of 7 201024864; the detecting unit is electrically connected to the second ends of the light-emitting units to capture a detection signal and output a feedback signal accordingly; protection control The unit is electrically connected to the detecting unit and the driving unit respectively, and outputs a protection signal to the driving unit according to the feedback signal. To achieve the above object, a display device according to the present invention includes a display panel and a backlight module. The backlight module is disposed opposite to the display panel and includes a plurality of light emitting units, a driving unit, a detecting unit and a protection control unit. Each of the light emitting units has a first end and a second end, and the second ends of the light emitting units are electrically connected to each other; the driving unit is electrically connected to the first ends of the light emitting units, and outputs a plurality of driving The signals are respectively driven to drive the light-emitting units; the detecting unit is electrically connected to the second ends of the light-emitting units to capture a detection signal and output a feedback signal; the protection control unit separately detects The unit and the driving unit are electrically connected, and output a protection signal to the driving unit according to the feedback signal. As described above, the display device and the backlight module of the present invention connect one end of each of the light-emitting units in series, and use a detecting unit to detect and capture a voltage change or a current change at the end as a detection signal. The output feedback signal is transmitted to the protection control unit to generate a protection signal to the driving unit to activate the protection function, thereby effectively reducing the design cost and complexity of the circuit. [Embodiment] Hereinafter, a backlight module and a display device according to a preferred embodiment of the present invention will be described with reference to the related drawings. 201024864 Please refer to FIG. 3 and FIG. 4, which are schematic diagrams of a backlight module 3 according to a preferred embodiment of the present invention. Referring first to FIG. 3, a schematic diagram of a backlight module 3 including a plurality of light emitting units 30, a backing plate 34, and a circuit board (not shown) is shown in the preferred embodiment of the present invention. The illuminating unit 30 is disposed opposite to the reflecting surface 341 of one of the back plates 34, and is disposed on the backing plate 34 by at least one supporting member (not shown). The circuit board can be disposed on the other side of the back plate 34 with respect to the reflective surface 341 or on the side of the back plate 34, which is not limited herein. In addition, the backing plate 34 can be a metal backing plate that serves as a grounding end. Referring to FIG. 4, the backlight module 3 of the preferred embodiment of the present invention further includes a driving unit 31, a detecting unit 32, and a protection control unit 33. The driving unit 31, the detecting unit 32, and the protection control unit 33 described herein are disposed on the circuit board as described above. Continuing to refer to FIG. 4, each of the light-emitting units 30 has a first end 301 and a second end 302, and the second ends φ 302 of the light-emitting units 30 are electrically connected to each other. In this embodiment, the light emitting unit 30 can be a fluorescent tube, which can be, for example, a cold cathode fluorescent tube (CCFL), a hot cathode fluorescent tube (HCFL), or an external electrode fluorescent tube (EEFL). . The driving unit 31 is electrically connected to the first ends 301 of the light emitting units 30, and outputs a plurality of driving signals to respectively drive the light emitting units 30. In this embodiment, the driving unit 31 can have a plurality of inverters to respectively output a positive high voltage driving signal or a negative high voltage driving signal, and accordingly drive the light emitting units 30 to emit light. The inverter system may include a switching circuit and a boosting circuit (not shown), and the switching circuit is operated by the switching circuit 9 201024864 to cause the boosting circuit to output high voltage alternating current. Here, the switching circuit may be composed of a switching element such as a transistor, and the step-up circuit may be composed of, for example, a transformer. The detecting unit 32 is electrically connected to the second ends 302 of the light emitting units 30 to capture a signal and output a feedback signal SF. In this embodiment, the measurement signal can be a voltage signal or a current signal, which is not limited, and the capabilities of the overall architecture and the detection unit are considered. In other words, the detecting unit 32 can be a voltage detecting unit or a current detecting unit. The protection control unit 33 is electrically connected to the detection unit 32 and the driving unit 31, and outputs a protection signal SP to the driving unit 31 according to the feedback signal SF. In this embodiment, the protection signal SP can be a preset pulse width modulation (PWM) signal so that the driving unit 31 does not continue to output the excessive power driving signal; or the forced closing signal can be used to turn off the driving unit 31. Instead of continuing to output the drive signal. The second ends 302 of the light-emitting units 30 are electrically connected to each other by a floating connection, and the units electrically connected to the light-emitting unit 30 are not shared with the metal backplane. The noise generated by the output signals of the light-emitting units 30 is prevented from being transmitted through the metal back plate 34, thereby affecting the normal operation of the overall system of the backlight module 3. The detection unit 32 and the protection control unit 33 will be described in detail below in conjunction with the related drawings. Please refer to FIG. 5A, which is a schematic diagram of a circuit structure of an aspect of the display detecting unit 32. The detecting unit 32 has a voltage dividing circuit, a rectifying circuit and an amplifier electrically connected to each other. Since the general protection control 10 201024864 unit 33 cannot receive the high-voltage driving signal for driving the light-emitting unit 30, the detecting unit 32 can convert the higher-voltage detection signal into a lower-voltage feedback signal SF and output the protection signal. Control unit 33 for subsequent actuation. In addition, please refer to FIG. 5B, which is a schematic diagram of a circuit architecture of another aspect of the display detecting unit 32. The detecting unit 32 has a signal converting circuit and a rectifying circuit electrically connected to each other. The signal conversion circuit uses, for example, a transformer to step down a relatively high voltage detection signal, and outputs a relatively low voltage feedback signal SF via the rectifier circuit. It is the same as the above-mentioned detection unit 32, and therefore will not be further described herein. It is to be noted that the above-mentioned backlight module 3 has only one detection unit 32 and protection control unit 33 as an example. However, in order to cope with the increasing size of the backlight module, it is also possible to add a plurality of sets of detection units and protection control units, mainly to maintain a set of detection units and protection control unit φ element corresponding to the complex illumination unit. . Next, please refer to FIG. 6, which is a schematic diagram of a display device 4 in accordance with a preferred embodiment of the present invention. The display device 4 includes a display panel 40 and a backlight module 41 disposed opposite the display panel 40. The backlight module 41 includes a plurality of light emitting units, a driving unit, a measuring unit, and a protection control unit. Each of the light emitting units has a first end and a second end, and the second ends of the light emitting units are electrically connected to each other. The driving unit is electrically connected to the first ends of the light emitting units, and outputs a plurality of driving signals to respectively drive the light emitting units. The detection unit 11 201024864 is connected to the illumination unit and outputs, calls back to retrieve, and the unit and the drive material (4) read the debt and measure the signal to the drive unit.纟 ‘ and 授 授 输出 — — — — — — — — 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于In summary, the display device and the backlight module of the present invention emit light, and use one (four) measuring unit to detect and take the end of the transmission, and output the feedback ==!: ' to generate 1 protection signal. The drive unit can be used to effectively reduce the design cost and complexity of the circuit. Too: Illustrative' is not a limitation. Any undivided: Ming: God 4 domain' and its equivalent should be included in the scope of the attached patent application. [Simple diagram of the diagram] = Schematic diagram of a conventional backlight module; schematic diagram of the architecture of a conventional T backlight module; schematic representation of the backlight module of the preferred embodiment of the invention FIG. 5B is a schematic diagram of a circuit diagram of a backlight module according to a preferred embodiment of the present invention; FIG. 5B is a schematic diagram of a circuit diagram of a backlight module according to a preferred embodiment of the present invention; FIG. A schematic diagram of another circuit architecture of a detection unit of a backlight module; and FIG. 6 is a schematic diagram of a display device in accordance with a preferred embodiment of the present invention. [Main component symbol description] 1, 2, 3, 41: backlight module® 10, 20, 30: light-emitting unit 101, 301: first end 102, 302: second end 111, 112, 21, 31: drive unit 22, 32: detection unit 23: protection unit 33: protection control unit reference 34 · back panel 341: reflective surface 4: display device 40: display panel SF: feedback signal
Sp :保護訊號 13Sp : Protection signal 13