13-38274 2〇10/10/丨8修正 九、發明說明： 【發明所屬之技術領域】 本發明是關於一種背光模組、可調整背光模組輝度之 系統及背光模組之驅動方法’且特別是有關於一種提升背 光模組之背光均勻度之背光模組、可調整背光模組輝度之 系統及背光模組之驅動方法。 【先前技術】13-38274 2〇10/10/丨8 Amendment 9. Invention: [Technical Field] The present invention relates to a backlight module, a system for adjusting brightness of a backlight module, and a driving method of a backlight module. In particular, there is a backlight module for improving the backlight uniformity of a backlight module, a system for adjusting the brightness of the backlight module, and a driving method for the backlight module. [Prior Art]
請參照第1圖，習知背光模組100包括電源102、複 數組並聯設置之發光二極體組106及一電流平衡電路 (Current Balancer) 104。電源102用以輸出驅動電流idReferring to FIG. 1 , the conventional backlight module 100 includes a power source 102, a plurality of LED arrays 106 arranged in parallel in a plurality of arrays, and a current balancer (Current Balancer) 104. The power source 102 is used to output a driving current id
以分別驅動發光二極體組106。發光二極體組ι06係分別 包括多個串聯設置之發光二極體106a。發光二極體組1〇6 之一端耦接至電源102,另一端耦接至電流平衡電路1〇4。 電流平衡電路104用以接收流經發光二極體組i〇6之驅動 電流ID，並使驅動每一發光二極體組1〇6之電流ij)相等， 達到電流平衡之目的。 請參照第2圖，另一習知背光模組200包括複數組驅 動電路202及複數組發光二極體組204。每一驅動電路2〇2 僅驅動一組發光二極體組204，發光二極體組2〇4係包括 多個串聯設置之發光二極體204a，每一發光二極體組2〇4 之兩端分別連接於相對應之驅動電路2〇2，以使驅動 =提供-㈣f流U)’㈣控制各自之發光 2〇4，以達到電流平衡之目的。 菔， 1338274 201Q/丨〇/丨8修正 然而，習知背光模組100、200所採用之各個發光二 極體，由於在元件特性上係具有若干誤差及對時間之衰減 速度之差異不同，因此，以同一驅動電流驅動時，各發光 二椏體組所發出之光線之輝度可能不同，使得背光模組之 輝度不均勻。而為了減少不同發光二極體組間的輝度差異 性’習知作法中必須選用元件特性差異性較小之發光二極 體，亦即是，習知背光模組對發光二極體之元件特性之誤 差容忍度較低。由於元件躲差異性較小之發光二極體成 本高昂，如此將使習知背光模組之成本提高。 【發明内容】 有鑑於此，本發明的目的為提出一種背光模組、可調 整背光模組輝度之純、及背光模組之驅動方法，使本發 明之背光模組具有背光輝度之均勾度高、發光二極體元件 特性差異度容忍度高及可校正背光輝度之優點。 根據本發明的目的提出-種背光模組，包括N組發光 及—控制單元，N為大於1之自_。控制單元 用以根據N組驅動參數來分別控制N組發光二極體串，以 組發光二極體串產生對應之輝度。其中，n 動參數係藉由使用一感測組件來產生。 产之本發明的另—目的’提出―種可調整背光模組輝 感測組件係包括-承一感_=載之體:包數括 6 1338274 r·· 2010/10/18 修正 N個區域。N個感測單元係分別配置於N個區域上。而感The light emitting diode group 106 is driven separately. The light-emitting diode group ι06 includes a plurality of light-emitting diodes 106a arranged in series, respectively. One end of the LED group 1〇6 is coupled to the power source 102, and the other end is coupled to the current balancing circuit 1〇4. The current balancing circuit 104 is configured to receive the driving current ID flowing through the LED group i 〇 6 and equalize the current ij) for driving each of the LED groups 1 〇 6 to achieve current balancing. Referring to FIG. 2, another conventional backlight module 200 includes a complex array driving circuit 202 and a complex array LED group 204. Each of the driving circuits 2〇2 drives only one set of the LED groups 204, and the LED group 2〇4 includes a plurality of LEDs 204a arranged in series, each of the LED groups 2〇4 The two ends are respectively connected to the corresponding driving circuit 2〇2, so that the driving=providing-(four)f-flow U)'(4) controls the respective light-emitting 2〇4 for the purpose of current balance.菔, 1338274 201Q/丨〇/丨8 correction However, the respective light-emitting diodes used in the conventional backlight modules 100 and 200 have different errors in the characteristics of the components and different speeds of decay of time. When driving with the same driving current, the brightness of the light emitted by each of the light-emitting diode groups may be different, so that the brightness of the backlight module is not uniform. In order to reduce the difference in luminance between different groups of light-emitting diodes, it is necessary to select a light-emitting diode having a small difference in component characteristics, that is, the component characteristics of the conventional backlight module for the light-emitting diode. The error tolerance is low. The high cost of the light-emitting diodes due to the fact that the components are less versatile will increase the cost of the conventional backlight module. SUMMARY OF THE INVENTION In view of the above, the object of the present invention is to provide a backlight module, a pure brightness of the backlight module, and a driving method of the backlight module, so that the backlight module of the present invention has the uniformity of backlight brightness. High and light-emitting diode components have high degree of tolerance for characteristics and correctable backlight brightness. According to the object of the present invention, a backlight module is provided, comprising N sets of illumination and control units, wherein N is greater than one. The control unit is configured to separately control the N sets of LED strings according to the N sets of driving parameters, and generate corresponding luminances by the group of LED strings. Where n parameters are generated by using a sensing component. The other object of the present invention is to provide an adjustable backlight module. The sensing component includes a bearing body _= a carrier body: the number of packages includes 6 1338274 r·· 2010/10/18 Correcting N regions . The N sensing units are respectively disposed on N areas. Sense
測組件係_性舰置於背光额上，⑽感測組件之N 個感測單元分別感測背光模組中N組發光二極體串之輝 度0 根據本發明的再—目的，提出—背光模組之驅動方 法’此背光模組係包㈣組發光二極體串及—控制單元。The measuring component is placed on the backlight, and the N sensing units of the sensing component respectively sense the luminance of the N sets of LED strings in the backlight module. According to the re-purpose of the present invention, the backlight is provided. Module driving method 'This backlight module is a package (4) group of LED strings and a control unit.
N為大於1之自錄。背光模組之轉方法包括執行一校 正模式及二正常模式。執行校正模式係包括下列步驟。首 控制lit係根據N組财參數驅動N組發光二極體 :使一感測組件以面對N組發光二極體串之方式 恭止光模組上’使感測組件之N個感測單元分別感測 亩’It極！串之輝度。然後，調整此Ν組預定參數， 5?丨、“丨：？測單兀分別感測到Ν組發光二極體串之輝度分 ==個特定輝度為止。之後，將調整後之_預定參 數作為參數儲存於背光模組之控制單元中。執行 一般模辆包括Τ列步驟。首先，㈣單元载入 Ν組驅動 參數，並據以驅動Ν組發光二極體串。 *為讓本發明之上述目的、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】 叫參照第3圖，其繪示依照本發明之一較佳實施例之 可調整背光模組輝度之系統的示意圖。可調整背光模組 7 1338274 2〇i<yi〇/i8 修正 輝度之系統包括背光模組302及感測組件304。其中感測 組件304係可選擇性地設置於背光模組3〇2上。感測組件 304係包括承載體304a及N個感測單元304b。承載體304a 係用以承載感測單元304b。本實施例係以N等於8為例進 行說明。 請參照第4圖，其繪示第3圖令之背光模組302之電 路方塊圖。背光模組302係包括電源408、發光二極體串 402(1)〜402(M)、開關、電阻R(l)〜R(M)及控制單元406。 開關較佳地為N型金屬氧化物半導體場效電晶體（Metal Oxide Semiconductor Field Effect Transistor，MOSFET) 404(1)〜404(M) 為大於1之自然數。 發光二極體串402(1)〜402(M)係分別包括多個發光二 極體402a。發光二極體串402(1)〜402(M)係分別包括第一 端及第二端。多個發光二極體402a係串聯地耦接於此第 一端及第二端之間。發光二極體串402(1)〜402(M)之第一 端係分別耦接至電源408之一端。MOSFET 404(1)〜404(M) 之汲極（Drain)係分別耦接至發光二極體串402(1)〜402(M) 之第二端。發光二極體串402(1)〜402(M)係分為8組。N is a self-recording greater than one. The method for rotating the backlight module includes performing a correction mode and a second normal mode. Performing the calibration mode includes the following steps. The first control lit system drives N groups of light-emitting diodes according to the N group parameter: enabling a sensing component to face the N groups of LED strings to ensure the N sensing of the sensing component The unit senses the acres 'It's extremely! The brightness of the string. Then, adjust the predetermined parameters of the group, 5?丨, “丨:? 测 兀 感 感 感 感 感 感 感 感 = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = The parameter is stored in the control unit of the backlight module. The execution of the general mode includes a step of arranging. First, the (4) unit loads the group driving parameters and drives the group of LED strings according to the present invention. The above-mentioned objects, features, and advantages will be more apparent and understood from the following detailed description of the preferred embodiments. A schematic diagram of a system for adjusting the brightness of a backlight module in a preferred embodiment. The adjustable backlight module 7 1338274 2〇i<yi〇/i8 The system for correcting luminance includes a backlight module 302 and a sensing component 304. The sensing component 304 is selectively disposed on the backlight module 3〇 2. The sensing component 304 includes a carrier 304a and N sensing units 304b. The carrier 304a is used to carry the sensing unit 304b. The description is made by taking N equal to 8 as an example. Please refer to FIG. 4, which is a circuit block diagram of the backlight module 302 of the third embodiment. The backlight module 302 includes a power source 408, LED strings 402(1)-402(M), switches, Resistors R(1) to R(M) and control unit 406. The switch is preferably a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) 404(1)~404(M) A plurality of light-emitting diodes 402 (1) to 402 (M) respectively include a plurality of light-emitting diodes 402a. The light-emitting diode strings 402 (1) to 402 (M) respectively include the first And a plurality of LEDs 402a are coupled in series between the first end and the second end. The first ends of the LED strings 402(1) to 402(M) are respectively The drains of the MOSFETs 404(1) to 404(M) are respectively coupled to the second ends of the LED strings 402(1) to 402(M). The polar body strings 402(1) to 402(M) are divided into eight groups.
電阻R(l)〜R(M)之第一端係分別耦接至MOSFET 404(1)〜404(M)之源極（Source)。MOSFET 404(1)〜404(M) 之閘極（Gate)係受控於控制單元406。電阻R(l)〜R(m)之 第二端係分別耦接至電源408之另一端。電阻R(l)〜mm) 之第一端係定義為節點ΝΤ(1)~ΝΤ(Ι〇，以分別輸出回授訊 號SR(1)〜SR(M)至控制單元406。電阻R(l)〜R(M)較佳地係 1338274 2010/10/18 修正 具有實質上相同之電阻值。 電源408係用以輸出電流ID”（1)〜ID”（M)。電流 ID”（1)〜ID”（M)將分別驅動發光二極體串 402(1)〜402(M)，以分別使發光二極體串402(1)〜402(M) 發光。電流ID” U)〜ID”（M)係分別為M0SFET 404(1)〜404(M)之源極電流。 控制早元406用以儲存8組驅動參數。控制單元406 將根據回授訊號SR(1)〜SR(M)及8組驅動參數分別輸出控 制訊號SC(1)〜SC(M)。控制訊號SC(1)〜SC(M)例如為脈波 寬度調變（Pulse Width Modulated Signal，PWM)訊號， 且控制訊號SC(1)〜SC(M)之工作週期（j)uty Cycle)係分別 和該8組驅動參數相關。舉例來說，同一組之一個或多個 發光二極體串所接收的一個或多個控制訊號係為相同的 控制訊號。 M0SFET 404(1)〜404(M)之閘極將分別接收控制訊號 SC(1)〜SC(M)，以分別調整電流id”（1)〜ID，’。電流 ID”（1)〜ID”（Μ)之平均f流大小將影響對應之發光二極 體串402(1)〜402(M)之輝度。控制單元4〇6並用以輸出一 内部訊號VI至電源408，以控制電源408之開啟。 8組驅動參數係由感測組件304所產生。8個感測單 元係以4*2之矩陣排列在承載體3〇4a上。8個感測單元 304b係用以分別感應8組發光二極體串之輝度，以分別產 生8組驅動參數。其中8組發光二極體串係和8個感測單 元304b具有一對一之對應之關係。8組驅動參數之產生方 9 叫8274 2010/10/18 修正 法係將於下文中詳述。 請參照第5圖，其繪示依照本發明之一較佳實施例之 者光模組之驅動方法之流程圖。背光模組302之操作模 式包括一校正模式及一正常模式。背光模組3〇2之8組驅 動參數係於校正模式下進行調整，通常此8組驅動參數係 於背光模組出廠前進行調整。通常於出廠後，背光模組3〇2 即處於正常模式下以執行正常操作。背光模組3〇2包括一 個選擇開關502，以選擇背光模組3〇2之操作模式。 知:正模式包括以下之步驟。首先，於步驟中，控 制單疋406係根據8組預定參數驅動發光二極體串 402(1)〜4〇2(M)。8組預定參數例如分別為對應至使8組發 光二極體串分別發出最大輝度之電流參數值。 接著，於步驟506中，使感測組件3〇4以面對發光二 極體串402⑴〜搬〇〇之方式配置於f光模組3Q2上如 第3圖所示。感測組件304之8個感測單元難係用以 分別感測8組發光二極體串之輝度及色度。 灸勃然步驟508中’控制單元406將調整8組預定 之 定輝度及色度較佳的為8個相;=3止;= 模組302之8組發光二搞辨由砰度及色度，以使背先 使背光模組3G2得以發出H度及色度實質上相等， 地分別為對應至使8_光！光。8組驅動參數較佳 度及色度之電流參數值極體串分別發出8個特定輝 1338274 2010/10/18 修正 〜之後，於步驟510中，控制單元4〇6將調整後之8組 預^參數設為8組驅動參數，並將8組驅動參數儲存於控 制單70 406中。控制單元406將在背光模組302正常啟動 . 時根據此8組驅動參數分別輸出控制訊號SC(1)~SC(M)， 以控制8組發光二極體串之輝度分別等於8個 度。 正吊模式之正常操作則包括下列之步驟。於步驟512 中，控制單元406載入8組驅動參數，並具以分別驅動8 組發光二極體申。由於正常模式下所載入的8組驅動參數 係為背光模組302於校正模式下調整過後的驅動參數，故 虽背光模組302載入此8個驅動參數，並據以控制多個發 光二極體串時，可以達到使背光模組3〇2發出均勻之背光 的效果。 本發明之背光模組302主要係透過一感測組件304之 感測單元304b來感測背光模組3〇2中發光二極體串 鲁402(1)〜402(M)之輝度。本發明之背光模組3〇2更透過執 行校正模式，使背光模組302中之控制單元406根據感測 单元304b之感測結果調整背光模組go?中8組驅動參數 之值。如此’即可調整流經發光二極體串402(1)〜402(M) 之電流ID”（1)〜ID”（M) ’以對發光二極體串 402(1)〜402(M)之輝度進行調整。這樣一來，即使發光二 極體串402(1)〜402(M)中之發光二極體4〇2a之元件特性具 有若干誤差’背光模組302還是可以透過調整8組驅動參 數之方法使背光模組302發出均勻之背光。 丄JJOZ/4 2010/10/18 修正 實施例係以8級發光二極體串及8個感測單元4〇4b :I胁說明，然而本實施例所揭露之背光模組302之發光 1 —串的組，及感測組件3〇4之感測單元之數目並不 祕8 ^舉㈣說’亦可將Μ個發p極體串分成Μ組， 母組具有一個發光二極體串。 上述實施例所揭露之背光模組、可調整背光模組輝度 之系統及背錢組之驅動方法，可根據背光模組之發光二 極體串之輝度調整流經發光二極體串之電流 ，故可避免傳 統背光模組因僅能提供實質上相等之電流 ，而使背光模組 貪光不均勻之問題’故本發明之背光模組，係具有使背 光更均勻化之優點。 此因為本發明之背光模組中，流經各發光二極體 一之電係具有可調整性，可使本發明之背光模組對發光 極體之元件特性之誤差容忍、度較高 ，亦即是，本發明之 光模組可選用具有^件特性差異較高但成本較低之發 一極體，故，本發明之背光模組係具有成本低廉之優點。 串再者’本發明之背光模組可透過調整流經發光二極體 模2電流來調整背光模組之背光輝度，因此本發明之背光 優=糸具有可於長時間使用後，再度地校正背光之輝度之 發光-本發明之背光模組可有效地解決傳統背光模組因為 二二一極體衰退逮度不同而造成傳統背光模組之背光輝 度不均勻之問題。 然其Γί所述，雖然本發明已以一較佳實施例揭露如上， 、用以限定本發明，任何熟習此技藝者，在不脫離 12 1338274 2010/10/18 修正 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】 第1圖繪示一習知背光模組之電路示意圖。 第2圖繪不另一習知背光模組之電路不意圖。 第3圖繪示依照本發明之一較佳實施例之一可調整背 _ 光模組輝度之系統的示意圖。 第4圖繪示第3圖中之背光模組之電路方塊圖。 第5圖繪示依照本發明之一較佳實施例之一背光模組 之驅動方法之流程方塊圖。 【主要元件符號說明】 102、408 :電源 104 :電流平衡電路 • 106、204 :發光二極體組 106a、204a :發光二極體 202 :驅動電路 ID、ID’ ：驅動電流 302 :背光模組 304 :感測組件 304a :承載體 304b :感測單元 13 1338274 20UV10/18 修正 402(1)〜402(M):發光二極體串 402a :發光二極體 404(1)〜402(M):開關 406 :控制單元 R(l)〜R(M):電阻 NT(IMM):節點 ID”（1)〜ID”（M):電流 SR(1)〜SR(M):迴授訊號 SC(1)〜SC(M):控制訊號 VI :内部訊號 502 :選擇開關 504〜512 :流程步驟The first ends of the resistors R(1) to R(M) are respectively coupled to the sources of the MOSFETs 404(1) to 404(M). Gates of MOSFETs 404(1) through 404(M) are controlled by control unit 406. The second ends of the resistors R(1) to R(m) are respectively coupled to the other end of the power source 408. The first end of the resistor R(l)~mm) is defined as a node ΝΤ(1)~ΝΤ(Ι〇 to output the feedback signals SR(1) to SR(M) to the control unit 406. The resistor R(l) ) R(M) is preferably 1338274 2010/10/18 The correction has substantially the same resistance value. The power supply 408 is used to output the current ID "(1) ~ ID" (M). Current ID" (1) ~ID"(M) will drive the LED strings 402(1) to 402(M) respectively to respectively illuminate the LED strings 402(1) to 402(M). Current ID" U)~ID (M) is the source current of the MOSFETs 404(1) to 404(M), respectively. The early element 406 is controlled to store 8 sets of drive parameters. The control unit 406 outputs the control signals SC(1) to SC(M) based on the feedback signals SR(1) to SR(M) and the eight sets of drive parameters, respectively. The control signals SC(1) to SC(M) are, for example, Pulse Width Modulated Signal (PWM) signals, and the duty cycles (j) uty Cycle of the control signals SC(1) to SC(M) are Corresponding to the 8 sets of drive parameters. For example, one or more of the control signals received by one or more of the LED strings of the same group are the same control signal. The gates of M0SFET 404(1)~404(M) will receive control signals SC(1)~SC(M) respectively to adjust current id"(1)~ID, '.current ID"(1)~ID The average f-stream size of (Μ) will affect the luminance of the corresponding LED string 402(1)-402(M). The control unit 4〇6 is used to output an internal signal VI to the power source 408 to control the power source 408. The eight sets of driving parameters are generated by the sensing component 304. The eight sensing units are arranged in a matrix of 4*2 on the carrier 3〇4a. The eight sensing units 304b are used to respectively sense 8 groups. The brightness of the LED string is generated to generate 8 sets of driving parameters respectively, wherein 8 sets of LED series and 8 sensing units 304b have a one-to-one correspondence relationship. 8 sets of driving parameters are generated 9 8274 2010/10/18 The correction method will be described in detail below. Please refer to FIG. 5, which is a flow chart of a method for driving an optical module according to a preferred embodiment of the present invention. The operation mode includes a correction mode and a normal mode. The eight sets of driving parameters of the backlight module 3〇2 are adjusted in the calibration mode, usually 8 The group driving parameters are adjusted before the backlight module is shipped from the factory. Usually after the factory, the backlight module 3〇2 is in the normal mode to perform normal operation. The backlight module 3〇2 includes a selection switch 502 to select the backlight mode. The operation mode of the group 3〇2. The positive mode includes the following steps. First, in the step, the control unit 406 drives the LED strings 402(1) to 4〇2(M) according to 8 sets of predetermined parameters. The set of predetermined parameters is, for example, a current parameter value corresponding to each of the eight sets of light emitting diode strings respectively emitting the maximum luminance. Next, in step 506, the sensing component 3〇4 is faced to face the light emitting diode string 402(1) The method of moving the light is arranged on the optical module 3Q2 as shown in Fig. 3. The eight sensing units of the sensing component 304 are difficult to sense the luminance and chromaticity of the eight sets of LED strings, respectively. In the moxibustion step 508, the control unit 406 will adjust 8 sets of predetermined fixed brightness and chromaticity to preferably 8 phases; =3; = 8 sets of LEDs of the module 302 are distinguished by the degree and the chromaticity. In order to enable the backlight module 3G2 to emit H degrees and the chromaticity is substantially equal, the ground is respectively 8 。 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光 光6 Set the adjusted 8 sets of pre-parameters to 8 sets of drive parameters, and store 8 sets of drive parameters in the control list 70 406. The control unit 406 will start the backlight module 302 normally. According to the 8 sets of drive parameters The control signals SC(1)~SC(M) are respectively output to control the luminances of the eight sets of LED strings to be equal to 8 degrees. The normal operation of the positive suspension mode includes the following steps. In step 512, the control unit 406 loads the eight sets of drive parameters and drives the eight sets of light-emitting diodes respectively. Since the eight sets of driving parameters loaded in the normal mode are the driving parameters adjusted by the backlight module 302 in the calibration mode, the backlight module 302 loads the eight driving parameters and controls the plurality of LEDs accordingly. In the case of a polar body string, an effect of causing the backlight module 3〇2 to emit a uniform backlight can be achieved. The backlight module 302 of the present invention mainly senses the luminance of the LED arrays 402(1) to 402(M) in the backlight module 3〇2 through the sensing unit 304b of the sensing component 304. The backlight module 3〇2 of the present invention further performs the correction mode, so that the control unit 406 in the backlight module 302 adjusts the values of the eight sets of driving parameters in the backlight module go? according to the sensing result of the sensing unit 304b. Thus, the current ID "(1) to ID" (M)" flowing through the LED strings 402(1) to 402(M) can be adjusted to the pair of light-emitting diodes 402(1) to 402(M). The brightness of the adjustment is adjusted. In this way, even if the element characteristics of the light-emitting diodes 4〇2a in the LED strings 402(1) to 402(M) have some errors, the backlight module 302 can be adjusted by adjusting the eight sets of driving parameters. The backlight module 302 emits a uniform backlight.丄JJOZ/4 2010/10/18 The modified embodiment is illustrated by an 8-level LED string and 8 sensing units 4〇4b: I, but the backlight module 302 disclosed in the embodiment is illuminated 1 The group of strings, and the number of sensing units of the sensing component 3〇4 are not secret. (4) It is said that 'a pair of p-pole strings can also be divided into groups, and the mother group has one string of light-emitting diodes. The backlight module disclosed in the above embodiment, the system for adjusting the brightness of the backlight module, and the driving method of the back money group can adjust the current flowing through the LED string according to the brightness of the LED string of the backlight module. Therefore, the conventional backlight module can avoid the problem that the backlight module is not uniform due to the fact that only the substantially equal current can be supplied. Therefore, the backlight module of the present invention has the advantages of making the backlight more uniform. Therefore, in the backlight module of the present invention, the electrical system flowing through each of the light-emitting diodes has adjustability, so that the backlight module of the present invention can tolerate the error of the component characteristics of the light-emitting body, and the degree is also high. That is, the optical module of the present invention can be used with a polarizing body having a high difference in characteristics and a low cost. Therefore, the backlight module of the present invention has the advantages of low cost. The backlight module of the present invention can adjust the backlight luminance of the backlight module by adjusting the current flowing through the LED module 2, so that the backlight of the present invention can be recalibrated after a long time of use. Illumination of the brightness of the backlight-The backlight module of the invention can effectively solve the problem that the backlight brightness of the conventional backlight module is not uniform due to the different trapping degree of the 22nd polar body. However, the present invention has been described above in terms of a preferred embodiment, and is intended to be illustrative of the present invention, and those skilled in the art, without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended claims. [Simple Description of the Drawing] FIG. 1 is a schematic circuit diagram of a conventional backlight module. FIG. 2 depicts a circuit not in another conventional backlight module. FIG. 3 is a schematic diagram of a system for adjusting the luminance of a backlight module according to a preferred embodiment of the present invention. FIG. 4 is a circuit block diagram of the backlight module in FIG. 3. FIG. 5 is a block diagram showing the driving method of a backlight module according to a preferred embodiment of the present invention. [Main component symbol description] 102, 408: Power supply 104: Current balancing circuit • 106, 204: Light-emitting diode group 106a, 204a: Light-emitting diode 202: Driving circuit ID, ID': Driving current 302: Backlight module 304: sensing component 304a: carrier 304b: sensing unit 13 1338274 20UV10/18 correction 402 (1) ~ 402 (M): LED string 402a: LED 404 (1) ~ 402 (M) : Switch 406: Control unit R(l)~R(M): Resistor NT(IMM): Node ID"(1)~ID"(M): Current SR(1)~SR(M): Feedback signal SC (1) ~SC (M): Control Signal VI: Internal Signal 502: Selection Switch 504~512: Process Step