201013268 九、發明說明： 【發明所屬之技術領域】 用於=是：關於一種背光模組，特別是有關於-種應 用於顯不器之背光模組。 悝您 【先前技術】 ❿ ❹ 的要發展及生活水準的提高，人們對於顯示器 越來心’因此出現了液晶顯示器（lcd)來滿足人 門對顯不器的要求。在液晶顯w的製作成本十，背 組佔據了不少的部份，因此在液晶顯示器的製作工藝中， 如何減少背光模組的製作成本已經成為非常重要的課題。 請參照第1圖，其係緣示習知液晶顯示器之背光模組 100的功能方塊示意圖。背光模組100包含：燈管11〇、換 流器112、電流債測裝置114和控制器116。換流器112具 有-次側線圈118、鐵芯119和二次侧線圈12G，二次側線 圈120具有二輸出端點，其中輸出端點之一者係電性連接 至燈管U0之-端，而輸出端點之另一者則電性接地。換 流器112係以-對-連接之方式來點亮燈管m。電流偵測 裝置m係、電性連接至燈f 110之另一端，用以偵測燈管 110之燈管電流的和並回授偵測電流值至控制器116，其中 電流偵測裝置114係為簡單的電阻構造，用以將電流訊號 轉換為代表回授電流值的電壓訊號由。一般而言，電流偵 測裝置114係與其他裝置（例如控制器116)共地來完成電流 回授之功此。控制器116係電性連接至每一換流器1丨2，用 以根據偵測電流值來控制每一換流器丨丨2，以維持背光模組 5 201013268 • 100的亮度，其中控制器116之一端亦電性接地。背光模組 100係使用一個換流器來點亮一個燈管，此種做法的成本較 為昂貴。 請參照第2圖，其係繪示又一習知液晶顯示器之背光 模組200的功能方塊示意圖。背光模組2〇〇係類似於背光 模組100，其不同之處在於：換流器丨12包含兩組二次側線 圈120。由於換流器112具有兩組二次側線圈12〇，因此換 流器112可以一對二連接之方式來點亮燈管11〇。背光模組 〇 200 係使用一個換流器來點亮兩個燈管，因此背光模組2〇〇 所使用之換流器的數量比背光模組1〇〇少，但是具有兩組 一次側線圈之換流器在成本上比具有一組二次側線圈之換 流器昂貴，因此背光模組200的製作成本與背光模組1〇〇 的製作成本相差不大。 請參照第3圖，其係繪示再一習知液晶顯示器之背光 模組300的功能方塊示意圖。背光模組3〇〇係類似於背光 模組200，其不同之處在於：換流器丨12包含3組二次側線 Φ 圈120。由於換流器112具有三組二次側線圈120，因此換 流器112可以一對三連接之方式來點亮燈管η〇β背光模組 300係使用一個換流器來點亮三個燈管，因此背光模組2〇〇 所使用之換流器的數量比背光模組2〇〇少，但是具有三組 二次側線圈之換流器在成本上亦比具有兩組二次側線圈之 換流器昂貴，因此背光模組300的製作成本與背光模組2〇〇 的製作成本亦相差不大。 •由上述之說明可知’背光模組1 〇〇、2〇〇和300之換流 器的二次側線圈僅驅動一個直形燈管，因此需要一種新的 6 201013268 背光模組，可使換流器的二次侧線圏 • 少背縫組所制的換流㈣數量。 ^ 【發明内容】 因此’本發明的目#就是在提供一種背光模組與其製 造方法，此背光模組之換流器之二次側線圈可驅動之燈管 數量比習知技術更多，以減少背光模組所使用之換流器的 數量。 ® 轉明的另—目的就是在提供-種液晶顯示器，其換 流器之數量比習知液晶顯示器更少。 根據本發明之目的，提出一種背光模組。根據本發明 之較佳實施例，此背光模組至少包含：光源、換流器、電 流偵測裝置和控制器。光源係依序兩兩互相電性串聯，以 形成光源組。換流器係電性連接至光源組以點亮光源組之 光源。電流偵測裝置係電性連接至上述光源組之某一光源 組，用以根據此某一光源組之電流來輸出偵測電流值，使 Ο 控制器根據偵測電流值來控制換流器調整光源組的電流， 以維持背光模組的亮度。上述之電流偵測裝置具有電氣隔 離效果’可將光源與控制器電氣隔離。 根據本發明之較佳實施例，上述之換流器係包含至少 一二次側線圈，該二次側線圈的兩端點係分別電性連接至 對應之光源組而形成一迴路，意即一二次側線圈對應一光 源組而一光源組亦對應一二次側線圈。 根據本發明之較佳實施例，上述之電流偵測裝置為一 光輕合器’此光耦合器至少包含：電阻、發光二極體和光 201013268 • €晶體。發光二極體係電性並聯至電阻，以形成電流偵測 - 單元，其中電流偵測單元係電性串聯至上述之某一光源组 之光源之間，以伯測此某一光源組之光源之電流並據以發 射光線。光電晶體係用以感應光線來輸出上述之偵測電流 值。 根據本發明之較佳實施例，在上述之背光模組的製造 方法中，首先將複數個光源依序兩兩互相電性串聯，以形 成複數組光源組。接著進行一電能供應步驟，以將複數個 〇 電性連接至該些光源組來點亮該些光源組，其中該 電能供應步驟至少包含：將每一該些換流器之至少一二次 側線圈的兩端點電性連接至對應之該些光源組。然後利用 控制器來控制換流器。接著進行電流偵測步驟，以利用電 流偵測裝置來偵測光源組之一者的電流，而提供一偵測電 流值，使控制器根據此偵測電流值來控制換流器。 根據本發明之另一目的，提出一種液晶顯示器。根據 本發明之較佳實施例，此液晶顯示器包含面板和背光模 ® 纟且’其中面板和背^模組緊密結合以使面板可利用背光模 組所發射之光線來顯示液晶顯示器之晝面。 根據本發明之較佳實施例，上述之換流器係包含至少 一一次側線圈，該二次側線圈的兩端點係電性連接至對應 之光源組，意即一二次側線圈對應一光源組而一光源組亦 對應一二次側線圈。 “根據本發明之較佳實施例，上述之電流偵測裝置為一 光耦合器，此光耦合器至少包含：電阻、發光二極體和光 曰a體發光二極體係電性並聯至電阻，以形成電流偵測 8 201013268 單元，其中電流偵測單元係電性串聯至上述之某一光源組 之光源之間，以偵測此某一光源組之光源之電流並據以發 射光線。光電晶體係用以感應光線來輸出上述之偵測電流 值。 【實施方式】 請參照第4圖，其係繪示根據本發明之一實施例之背 光模組400的功能方塊示意圖。背光模組4〇〇至少包含： © 燈管410、換流器412、電流偵測裝置414和控制器416, 其中每一燈管410依序兩兩互相電性串聯以形成光源組 418。換流器412具有一次側線圈42〇、鐵芯421和二次侧 線圈422’二次側線圈422具有二輸出端點，其中輸出端點 之-者係電性連接至光源組418之—端，而輸出端點之另 一者則電性連接至光源組418之另一端，以形成一電流迴 路來點亮光源組418。電流偵測裝置414係電性連接至光源 組418’以偵測光源組418之電流並回授偵測電流值至控制 ® 器416。控制器416係電性連接至每一換流器412,用以根 據該偵測電流值來控制每一換流器412，以維持背光模組 400均勻的亮度，其中控制器416之一端亦電性接地。由於 換流器412係以一對一連接之方式來點亮先源組418，且光 源組418包含兩個燈管410’因此換流器412之二次側線圈 422可驅動兩個燈管41〇。因此本較佳實施例所使用之換流 器的數量可比習知技術更少。在本較佳實施例中，電流偵 測裝置414為具有電氣隔離效果之裝置（例如：光耦合器或 變壓器），以隔離燈管410與其他裝置的電氣訊號，如此可 9 201013268 避免節點A之電壓值被干擾而導致節點a之電壓低於換流 ' 器412所提供之電壓。 在本實施例中，光源可為冷陰極燈管或螢光燈管。另 外’本實施例可藉由電流偵測裝置414和光源組418的連 接方式’使所有燈管410的光均勻度快速地達到穩定的狀 態。以下將以光耦合器舉例說明。 請參照第5圖，其係繪示根據本發明之實施例之電流 偵測裝置414的等效電路示意圖，其中電流偵測裝置414 © 包含發光二極體510、電阻512和光電晶體514。發光二極 體510係電性並聯至電阻512以形成一電流偵測單元516, 其中電流偵測單元516係電性串聯至光源組418之兩燈管 41 〇之間，用以偵測光源組418之電流來發射光線至光電晶 體514。光電晶體514係用以感應發光二極體510所發射之 光線來輸出偵測電流值至控制器416，使控制器416可根據 偵測電流值來控制換流器412,以調整光源組418之電流大 小並維持背光模組400的亮度。 Φ 由以上說明可知背光模組400之電流偵測裝置414係 透過光電效應來偵測回授之電流，因此節點A的電壓不會 因電流偵測裝置414的偵測動作而降低。 請參照第6圖’其係繪示根據本發明之又一實施例之 背光模組600的功能方塊示意圖。背光模組6〇〇係類似於 背光模組400 ’其不同之處在於··背光模組6〇〇之換流器 412包含兩組二次側線圈422。由於換流器412具有兩組二 次側線圈422’因此換流器412可以一對二連接之方式來點 亮兩組光源組418,意即燈管換流器412可點亮四個燈管 201013268 410。因此本較佳實施例所使用之換流器的數量可比習知技 • 術更少。 請參照第7圖’其係繪示根據本發明之再一實施例之 背光模組700的功能方塊示意圖。背光模組7〇〇係類似於 背光模組400，其不同之處在於：背光模組7〇〇之換流器 412包含二組二次側線圈422。由於換流器412具有三組二 次側線圈422，因此換流器412可以一對三連接之方式來點 亮三組光源組418 ’意即燈管換流器412可點亮六個燈管 〇 410。因此本較佳實施例所使用之換流器的數量可比習知技 術更少。 請參照第8圖，其係繪示根據本發明之實施例之液晶 顯示器800的裝置示意圖。液晶顯示器800包含顯示面板 810、保護外殼812和背光模組400，其中顯示面板81〇係 與背光模組400緊密結合，以利用該背光模組4〇〇之光線來 顯示液晶顯示器800的晝面；保護外殼812則用以保護背 光模組40(^ φ 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明’任何熟習此技藝者’在不脫離本發明之精神和範 圍内’當可作各種之更動與潤飾，因此本發明之保護範圍 當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、和優點能更明 顯易懂，上文特舉一較佳實施例，並配合所附圖式，作詳 細說明如下： 201013268 ' 第1圖係繪示習知液晶顯示器之背光模組的功能方塊 • 示意圖。 第2圖係繪示又一習知液晶顯示器之背光模組的功能 方塊示意圖。 第3圖係繪示再一習知液晶顯示器之背光模組的功能 方塊示意圖。 第4圖係繪示根據本發明之實施例之背光模組的功能 方塊示意圖。 φ 第5圖係繪示根據本發明之實施例之電流偵測裝置的 等效電路示意圖。 第6圖係繪示根據本發明之又一實施例之背光模組的 功能方塊示意圖。 第7圖係繪示根據本發明之再一實施例之背光模組的 功能方塊示意圖β 第8圖係繪示應用本發明之實施例之背光模組之液晶 顯示器的結構示意圖。 ❷ 【主要元件符號說明】 100 ： 背光模組 112 ： 換流器 116 ： 控制器 119 ： 鐵芯 200 : 背光模組 400 ： 背光模組 412 ： 換流器 110 :燈管 114 :電流偵測裝置 118 : —次側線圈 120 :二次側線圈 3:背光模組 410 :燈管 414 :電流偵測裝置 12 201013268 416 ： 控制器 418 ： 420 ： 一次側線圈 421 ： 422 ： 二次側線圈 510 ： 發光二極體 512 ： 514 ： 光電晶體 516 ： 600 ： 背光模組 700 ： 800 ： 液晶顯不 810 ： 812 ： 保護外殼 A ：( 光源組 鐵芯 電阻 電流偵測單元 背光模組 顯示面板201013268 IX. Description of the invention: [Technical field to which the invention pertains] For = Yes: Regarding a backlight module, in particular, a backlight module for use in a display device.悝 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 In the production cost of liquid crystal display w, the back group occupies a lot of parts. Therefore, how to reduce the manufacturing cost of the backlight module has become a very important issue in the manufacturing process of the liquid crystal display. Please refer to FIG. 1 , which is a functional block diagram showing a backlight module 100 of a conventional liquid crystal display. The backlight module 100 includes a lamp 11 〇, an inverter 112, a current debt measuring device 114, and a controller 116. The inverter 112 has a secondary side coil 118, a core 119 and a secondary side coil 12G. The secondary side coil 120 has two output terminals, wherein one of the output terminals is electrically connected to the end of the lamp U0. And the other of the output terminals is electrically grounded. The inverter 112 illuminates the lamp m in a -to-connection manner. The current detecting device m is electrically connected to the other end of the lamp f 110 for detecting the sum of the lamp currents of the lamp 110 and feeding back the detected current value to the controller 116. The current detecting device 114 is For a simple resistor construction, the current signal is converted to a voltage signal representative of the feedback current value. In general, current sensing device 114 is co-located with other devices (e.g., controller 116) to perform current feedback. The controller 116 is electrically connected to each of the inverters 丨2 for controlling each of the inverters 根据2 according to the detected current value to maintain the brightness of the backlight module 5 201013268 • 100, wherein the controller One end of 116 is also electrically grounded. The backlight module 100 uses an inverter to illuminate a tube, which is more expensive. Please refer to FIG. 2 , which is a functional block diagram of a backlight module 200 of another conventional liquid crystal display. The backlight module 2 is similar to the backlight module 100 in that the inverter 12 includes two sets of secondary side coils 120. Since the inverter 112 has two sets of secondary side coils 12A, the inverters 112 can illuminate the tubes 11A in a one-to-two connection. The backlight module 〇200 uses an inverter to illuminate two lamps, so the number of inverters used in the backlight module 2〇〇 is smaller than that of the backlight module 1, but has two sets of primary side coils. The inverter is more expensive in cost than the inverter having a set of secondary side coils, so the manufacturing cost of the backlight module 200 is not much different from the manufacturing cost of the backlight module 1〇〇. Please refer to FIG. 3, which is a functional block diagram of a backlight module 300 of a conventional liquid crystal display. The backlight module 3 is similar to the backlight module 200 except that the inverter 丨12 includes three sets of secondary side lines Φ circle 120. Since the inverter 112 has three sets of secondary side coils 120, the inverter 112 can illuminate the lamp tube in a one-to-three connection manner. The backlight module 300 uses an inverter to illuminate three lamps. Therefore, the number of inverters used in the backlight module 2〇〇 is smaller than that of the backlight module 2, but the inverter having three sets of secondary side coils is also cost-effective than having two sets of secondary side coils. The inverter is expensive, so the manufacturing cost of the backlight module 300 is not much different from the manufacturing cost of the backlight module 2〇〇. • From the above description, the secondary side coils of the inverters of the backlight modules 1 〇〇, 2 〇〇 and 300 drive only one straight tube, so a new 6 201013268 backlight module is required. The secondary side of the flow 圏 • The number of commutations (4) made by the less back seam group. [Invention] Therefore, the present invention provides a backlight module and a manufacturing method thereof. The number of lamps that can be driven by the secondary side coil of the inverter of the backlight module is more than that of the prior art. Reduce the number of inverters used in the backlight module. The other purpose of the clarification is to provide a liquid crystal display with fewer inverters than conventional liquid crystal displays. According to the purpose of the present invention, a backlight module is proposed. According to a preferred embodiment of the present invention, the backlight module includes at least: a light source, an inverter, a current detecting device, and a controller. The light source is electrically connected in series to each other in order to form a light source group. The inverter is electrically connected to the light source group to illuminate the light source of the light source group. The current detecting device is electrically connected to a certain light source group of the light source group, and is configured to output a detected current value according to the current of the one light source group, so that the Ο controller controls the converter adjustment according to the detected current value. The current of the light source group to maintain the brightness of the backlight module. The current detecting device described above has an electrical isolation effect to electrically isolate the light source from the controller. According to a preferred embodiment of the present invention, the inverter includes at least one secondary side coil, and the two ends of the secondary side coil are respectively electrically connected to the corresponding light source group to form a loop, that is, one The secondary side coil corresponds to a light source group and the light source group also corresponds to a secondary side coil. According to a preferred embodiment of the present invention, the current detecting device is an optical light combiner. The optical coupler comprises at least: a resistor, a light emitting diode and a light 201013268. The light-emitting diode system is electrically connected in parallel to the resistor to form a current detecting unit, wherein the current detecting unit is electrically connected in series to the light source of the one of the light source groups to detect the light source of the certain light source group. The current is emitted according to the current. The photo-crystal system is used to sense light to output the detected current value. According to a preferred embodiment of the present invention, in the manufacturing method of the backlight module described above, a plurality of light sources are first electrically connected in series to each other to form a complex array of light source groups. And then performing a power supply step of electrically connecting the plurality of turns to the plurality of light source groups to illuminate the light source groups, wherein the power supply step comprises at least: at least one secondary side of each of the plurality of inverters The two ends of the coil are electrically connected to the corresponding light source groups. The controller is then used to control the inverter. Then, a current detecting step is performed to detect the current of one of the light source groups by using the current detecting device, and a detecting current value is provided, so that the controller controls the inverter according to the detected current value. According to another object of the present invention, a liquid crystal display is proposed. In accordance with a preferred embodiment of the present invention, the liquid crystal display includes a panel and a backlight module and wherein the panel and the back module are closely coupled such that the panel can utilize the light emitted by the backlight module to display the face of the liquid crystal display. According to a preferred embodiment of the present invention, the inverter includes at least one primary side coil, and the two ends of the secondary side coil are electrically connected to the corresponding light source group, that is, a secondary side coil corresponding to A light source group and a light source group also correspond to a secondary side coil. According to a preferred embodiment of the present invention, the current detecting device is an optical coupler, and the optical coupler includes at least: a resistor, a light emitting diode, and a diaphragm a body light emitting diode electrically connected in parallel to the resistor. Forming a current detecting 8 201013268 unit, wherein the current detecting unit is electrically connected in series between the light sources of the one of the light source groups to detect the current of the light source of the certain light source group and emit light according to the photoelectric crystal system. The present invention is used to sense the light to output the detected current value. [Embodiment] Please refer to FIG. 4, which is a functional block diagram of a backlight module 400 according to an embodiment of the present invention. At least: a lamp 410, an inverter 412, a current detecting device 414, and a controller 416, wherein each of the lamps 410 is electrically connected in series to each other to form a light source group 418. The inverter 412 has a primary side. The coil 42A, the iron core 421 and the secondary side coil 422' secondary side coil 422 have two output terminals, wherein the output terminal is electrically connected to the end of the light source group 418, and the output end is another One is electrically connected To the other end of the light source group 418, a current loop is formed to illuminate the light source group 418. The current detecting device 414 is electrically connected to the light source group 418' to detect the current of the light source group 418 and feedback the detected current value to The controller 416 is electrically connected to each of the inverters 412 for controlling each of the inverters 412 according to the detected current value to maintain uniform brightness of the backlight module 400, wherein the controller One end of the 416 is also electrically grounded. Since the inverter 412 illuminates the precursor group 418 in a one-to-one connection, and the light source group 418 includes two lamps 410', the secondary coil of the inverter 412 422 can drive two lamps 41. Therefore, the number of inverters used in the preferred embodiment can be less than that of the prior art. In the preferred embodiment, the current detecting device 414 is electrically isolated. A device (for example, an optocoupler or a transformer) to isolate the electrical signals of the lamp 410 from other devices, so that the voltage value of the node A is prevented from being disturbed, and the voltage of the node a is lower than that provided by the commutation device 412. Voltage. In this embodiment, light It can be a cold cathode lamp or a fluorescent tube. In addition, in the present embodiment, the light uniformity of all the lamps 410 can be quickly reached a stable state by the connection mode of the current detecting device 414 and the light source group 418. An example of a circuit diagram of a current detecting device 414 according to an embodiment of the present invention is shown in FIG. 5, wherein the current detecting device 414 includes a light emitting diode 510, The resistor 512 and the photo-crystal 514. The LED 510 is electrically connected in parallel to the resistor 512 to form a current detecting unit 516. The current detecting unit 516 is electrically connected in series to the two lamps 41 of the light source group 418. The current of the light source group 418 is detected to emit light to the photoelectric crystal 514. The photoelectric crystal 514 is configured to sense the light emitted by the LED 510 to output a detection current value to the controller 416, so that the controller 416 can control the inverter 412 according to the detected current value to adjust the light source group 418. The current is sized and maintains the brightness of the backlight module 400. Φ As can be seen from the above description, the current detecting device 414 of the backlight module 400 detects the feedback current through the photoelectric effect, so the voltage of the node A is not reduced by the detecting action of the current detecting device 414. Please refer to FIG. 6 for a functional block diagram of a backlight module 600 according to still another embodiment of the present invention. The backlight module 6 is similar to the backlight module 400'. The difference is that the inverter 412 of the backlight module 6 includes two sets of secondary side coils 422. Since the inverter 412 has two sets of secondary side coils 422', the inverter 412 can illuminate the two sets of light source groups 418 in a one-to-two connection manner, that is, the bulb inverter 412 can illuminate the four lamps. 201013268 410. Thus, the number of inverters used in the preferred embodiment can be less than in the prior art. Please refer to FIG. 7 for a functional block diagram of a backlight module 700 according to still another embodiment of the present invention. The backlight module 7 is similar to the backlight module 400, except that the inverter 412 of the backlight module 7 includes two sets of secondary side coils 422. Since the inverter 412 has three sets of secondary side coils 422, the inverter 412 can illuminate the three sets of light source groups 418 in a three-to-three connection manner, that is, the lamp tube inverter 412 can illuminate six lamps. 〇 410. Thus, the number of inverters used in the preferred embodiment can be less than in the prior art. Referring to Figure 8, there is shown a schematic diagram of a device for a liquid crystal display 800 in accordance with an embodiment of the present invention. The liquid crystal display 800 includes a display panel 810, a protective casing 812 and a backlight module 400. The display panel 81 is closely coupled to the backlight module 400 to display the surface of the liquid crystal display 800 by using the light of the backlight module 4 The protective cover 812 is used to protect the backlight module 40. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention to anyone skilled in the art without departing from the spirit and scope of the invention. The above-mentioned and other objects, features and advantages of the present invention are subject to the scope of the invention as defined by the appended claims. It can be more obvious and easy to understand. The above is a detailed description of the preferred embodiment and the following drawings: 201013268 ' Fig. 1 is a functional block diagram of a backlight module of a conventional liquid crystal display. 2 is a functional block diagram of a backlight module of another conventional liquid crystal display. FIG. 3 is a functional block diagram showing a backlight module of another conventional liquid crystal display. Fig. 4 is a functional block diagram of a backlight module according to an embodiment of the present invention. φ Fig. 5 is a schematic diagram showing an equivalent circuit of a current detecting device according to an embodiment of the present invention. FIG. 7 is a functional block diagram of a backlight module according to still another embodiment of the present invention. FIG. 7 is a functional block diagram of a backlight module according to still another embodiment of the present invention. A schematic diagram of a liquid crystal display of a backlight module according to an embodiment of the present invention. ❷ [Main component symbol description] 100 : Backlight module 112 : Inverter 116 : Controller 119 : Iron core 200 : Backlight module 400 : Backlight mode Group 412: Inverter 110: Lamp 114: Current detecting device 118: - Secondary coil 120: Secondary coil 3: Backlight module 410: Lamp 414: Current detecting device 12 201013268 416: Controller 418 : 420 : Primary side coil 421 : 422 : Secondary side coil 510 : Light-emitting diode 512 : 514 : Photoelectric crystal 516 : 600 : Backlight module 700 : 800 : Liquid crystal display 810 : 81 2 : Protective case A : ( Light source group Core resistance Current detecting unit Backlight module Display panel
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