200820187 九、發明說明： 【發明所屬之技術销域】 本毛月係關於〜種顯不裝置、背光模組及背光模組之 控制方法’特㈣於能夠針對背光模組的色度及輝度加以 控制或補償之液晶顯示裝置、背光模組及背光模組之控制 方法。 【先前技術】 隨著數位時代的來臨，液晶顯示裝置之技術亦快速成 長，已成為不可或缺的電子產品，因此對於液晶顯示裝置 之技術及功能的要求也愈來愈高。 如圖1所示，一種習知之液晶顯示裝置1係包含一液 晶顯示面板 2 ( Liquid Crystal Display Panel)以及一背光 模組3 ( Back light Module )。其中，液晶顯示面板2係主 要具有兩基板以及一夾設於兩基板間的液晶層（圖未示）； 而背光模組3係設置於液晶顯示面板2之一側，並發出均 勻的光線以分佈在液晶顯示面板2之表面。而背光模組3 係具有一擴散板31、一電路板32及一殼體33，而電路板 32係設置於殼體33上，擴散板31係相對設置於電路板 32上。電路板32係具有一紅色發光二極體D01、一綠色 發光二極體D02及一藍色發光二極體D03，一紅色感光元 件321、一綠色感光元件322、一藍色感光元件323及一 控制單元324，且紅色發光二極體D01、綠色發光二極體 D02、藍色發光二極體D03、紅色感光元件321、綠色感光 6 200820187 元件322、藍色感光元件323及控制單元324係分別設置 於電路板32上。 再如圖2所示，紅色感光元件321係具有一紅色彩色 濾光層C1、綠色感光元件322係具有一綠色彩色濾光層 C2及藍色感光元件323係具有一藍色彩色濾光層C3，以 分別感測紅色發光二極體1、綠色發光二極體D02及藍 色發光二極體D03所發出的光線，即紅光、綠光及藍光。 一般而言，感光元件321、322或323係於一次感測中掏 取一個發光強度並將其轉換為感測訊號，再由控制單元 324依據感測訊號來調整發光二極體D01、D02或D03的 發光強度。然而，背光模組3中會同時存在環境光，而於 感光元件321、322或323感測時，易受環境光的雜訊干 擾，故不僅造成感測訊號失真，更使控制或補償後之發光 強度有誤差。 此外，由於液晶顯示裝置1需針對不同顏色之發光二 極體D01、D02及D03而使用不同顏色的感光元件321、 322及323，故會造成成本的增加，更會增加使用空間及 電路佈線。 因此’如何提供-種不需使用多個感光元件即可感測 複數發光元件，並取得正確的感測訊號，以提升鉦誤差的 發光強度之液晶顯示裝置、背光模組及背光模組;;控制方 法，正是當前的重要课題之一。 【發明内容】 7 200820187 有鑑於上述課題，本發明之目的為提供一種不需使用 多個感光it件即可感測複數發光元件，並取得正確的感測 訊號，以提升無誤差的發光強度之液晶顯示裝置背光模組 及背光模組之控制方法。 '' 緣是，為達上述目的，依據本發明之一種背光模組之 控制方法，其中为光模組具有相異色系之一第一發光元件 及一第一發光元件，第一發光元件係具有一第一發光週 期，第二發光元件係具有-第二發光週期，而控制方法係 包含：感測第一發光元件之發光強度至少二次，以取得至 少二第一感測訊號；感測該第二發光元件之發光強度至少 一人以取付至夕一弟一感測訊號，以及依據該等第一感 測訊號及該等第二感測訊號，以分別控制或補償第一發光 元件及第二發光元件之發光強度。 另外，為達上述目的，依據本發明之一種背光模組係 包含- 發光元件、一第二發光元件、—感光元件以及 一控制單元。第一發光元件具有一第一發光週期，第二發 光元件具有一第二發光週期，且第二發光元件係與第一發 光元件為相異色系，感光元件係分別感測第一發光元件之 發光強度及第二發光元件之發光強度至少二次，以取得至 少二第一感測訊號及至少二第二感測訊號，控制單元係接 收並依據該等第一感測訊號及該等第二感測訊號，以控制 或補償第一發光元件及第二發光元件之發光強度。 又，為達上述目的，依據本發明之一種液晶顯示裝置 係包含一液晶顯示面板以及一背光模組。背光模組係設置 8 200820187 於液晶顯示面板之一側，並具有一第一發光元件、一第二 發光元件、一感光元件及一控制單元，第一發光元件係具 有一第一發光週期，第二發光元件係具有一第二發光週 期，且第一發光元件係與第二發光元件為相異色系，感光 元件係分別感測第一發光元件之發光強度及該第二發光 元件之發光強度至少二次，以取得至少二第一感測訊號及 至少二第二感測訊號，控制單元係接收並依據第一感測訊 號及第二感測訊號，以控制或補償第一發光元件及第二發 光元件之發光強度。 承上所述，因依據本發明之一種液晶顯示裝置、背光 模組及背光模組之控制方法，係藉由一個感光元件來感測 具有第一發光週期之第一發光元件及具有第二發光週期 之第二發光元件之發光強度至少二次，以得到至少二第一 感測訊號及至少二第二感測訊號，以使控制單元可依據並 計算第一感測訊號及第二感測訊號，以控制或補償第一發 光元件及第二發光元件之發光強度。此種方式，係藉由一 個感光元件就可感測多個不同色系的發光元件且分別感 測至少二次，再藉由計算所取得之多個感測訊號，以控制 或補償各發光元件的發光強度，故不僅可節省成本及電路 使用空間，更能有效地控制或補償發光元件之適當的發光 強度。 【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 9 200820187 一種液晶顯示裝置、背光模組及背光模組之控制方法。 請參照圖3所示，本發明較佳實施例之一種液晶顯示 裝置4包含一液晶顯示面板5以及一背光模組6。其中背 光模組6係設置於液晶顯示面板5之一側，而背光模組6 於實施上係可為一直下式背光模組或一側光式背光模 組，在此係以直下式背光模組為例。 背光模組6具有一電路板61、一擴散板62、一光學 膜片組63及一殼體64。其中電路板61係設置於殼體64， 擴散板62係與電路板61相對設置，而光學膜片組63係 與擴散板62相對設置。於本實施例中，光學膜片組63係 可具有一上擴散膜、一增亮膜以及一下擴散膜（圖未示）， 上擴散膜與下擴散膜係相對設置，而增亮膜係設置於上擴 散膜與下擴散膜之間。 電路板61係具有一第一發光元件Du、一第二發光元 件D12、一第三發光元件D13、一感光元件611及一控制 單元612 ’其係設置於電路板61上且與電路板61上之電 路佈線電性連接（圖未示）。當然，本實施例之感光元件611 與控制單元612係可設置於與第一發光元件du、第二發 光元件D12及第三發光元件〇13不同的電路板61之表面 上（圖未示）’或亦可將感光元件611與控制單元612設置 於另一電路板上，再與電路板61電性連接（圖未示）。 第一發光元件D11、第二發光元件〇12及第三發光元 件D13，係分別發出相異色系之光線，例如··紅光、藍光 及綠光，且於實施上係可分別為一發光二極體，例如係可 200820187 分別為一紅色發光二極體、一監色發光二極體或一綠色發 光二極體，在此並以背光模組6具有複數個第一發光元件 D11、複數個第二發光元件D12及複數個第三發光元件!^^ 為例。 感光元件611係可為一光感測器、一光敏電阻、光電 晶體(phototransistor)或一感光二極體（photodiode)，並用 以分別感測第一發光元件D11、第二發光元件D12及第三 發光元件D13所發出之紅光、藍光及綠光之發光強度（如 圖4所示）。且分別感測的次數皆至少二次以上，並於感測 第一發光元件D11、第二發光元件D12及第三發光元件 D13之發光強度後，分別取得至少二第一感測訊號、至少 一弟一感測訊號及至少二第三感測訊號（圖未示）。意即， 每一發光元件之感測次數係與所取得之第一感測訊號、第 二感測訊號或第三感測訊號之個數為相同，當然，第—感 測訊號、第二感測訊號或第三感測訊號之個數則可，以相同 或不相同，係依據使用者之需求而決定。故於本實施例 中’係以感光元件611針對第一發光元件dii、第二發光 兀件D12或第三發光元件D13之感測次數為4次為例。 控制單元612係接收並分別依據各第一感測訊號、各 第二感測訊號及各第三感測訊號，以控制或補償第—發光 元件Du、第二發光元件D12及第三發光元件Di3之ς光 強度。而本實施例之控制單元612於實施上係可為一處理 器。 ”、、处 °月參照圖5Α至圖5C所示，承上所述，第一發光元件 11 200820187200820187 IX. Invention Description: [Technology sales field of invention] This Maoyue system is about the control method of the display device, the backlight module and the backlight module. (4) It can be used for the chromaticity and luminance of the backlight module. A control method for controlling or compensating a liquid crystal display device, a backlight module, and a backlight module. [Prior Art] With the advent of the digital age, the technology of liquid crystal display devices has also grown rapidly and has become an indispensable electronic product. Therefore, the requirements for the technology and functions of liquid crystal display devices are becoming higher and higher. As shown in FIG. 1, a conventional liquid crystal display device 1 includes a liquid crystal display panel 2 and a backlight module 3 (Back light Module). The liquid crystal display panel 2 mainly has two substrates and a liquid crystal layer (not shown) interposed between the two substrates; and the backlight module 3 is disposed on one side of the liquid crystal display panel 2 and emits uniform light. It is distributed on the surface of the liquid crystal display panel 2. The backlight module 3 has a diffusion plate 31, a circuit board 32 and a casing 33. The circuit board 32 is disposed on the casing 33, and the diffusion plate 31 is oppositely disposed on the circuit board 32. The circuit board 32 has a red light emitting diode D01, a green light emitting diode D02 and a blue light emitting diode D03, a red photosensitive element 321, a green photosensitive element 322, a blue photosensitive element 323 and a The control unit 324, and the red LED D01, the green LED D02, the blue LED D03, the red photosensitive element 321, the green photosensitive 6 200820187 element 322, the blue photosensitive element 323 and the control unit 324 are respectively It is disposed on the circuit board 32. As shown in FIG. 2, the red photosensitive element 321 has a red color filter layer C1, the green photosensitive element 322 has a green color filter layer C2, and the blue photosensitive element 323 has a blue color filter layer C3. In order to respectively sense the light emitted by the red light emitting diode 1, the green light emitting diode D02, and the blue light emitting diode D03, that is, red light, green light, and blue light. Generally, the photosensitive element 321, 322 or 323 takes a luminous intensity in one sensing and converts it into a sensing signal, and then the control unit 324 adjusts the LEDs D01, D02 or according to the sensing signal. The luminous intensity of D03. However, ambient light is present in the backlight module 3, and when the photosensitive element 321, 322 or 323 senses, it is susceptible to noise interference of ambient light, thereby causing not only distortion of the sensing signal but also control or compensation. There is an error in the luminous intensity. In addition, since the liquid crystal display device 1 needs to use the photosensitive elements 321, 322, and 323 of different colors for the LEDs D01, D02, and D03 of different colors, the cost is increased, and the use space and circuit wiring are increased. Therefore, 'how to provide a liquid crystal display device, a backlight module and a backlight module capable of sensing a plurality of light-emitting elements without using a plurality of photosensitive elements and obtaining a correct sensing signal to improve the luminous intensity of the error; The control method is one of the important topics at present. SUMMARY OF THE INVENTION 7 200820187 In view of the above problems, an object of the present invention is to provide a method for sensing a plurality of light-emitting elements without using a plurality of photosensitive members, and obtaining a correct sensing signal to improve the error-free luminous intensity. Liquid crystal display device backlight module and control method of backlight module. A method for controlling a backlight module according to the present invention, wherein the optical module has a first light-emitting element and a first light-emitting element of different colors, the first light-emitting element has a first illumination period, the second illumination element has a second illumination period, and the control method includes: sensing the illumination intensity of the first illumination element at least twice to obtain at least two first sensing signals; sensing the The illuminating intensity of the second illuminating element is at least one for the first sensation signal, and the first illuminating signal and the second sensible signal are respectively controlled to compensate or compensate the first illuminating element and the second The luminous intensity of the illuminating element. Further, in order to achieve the above object, a backlight module according to the present invention comprises - a light-emitting element, a second light-emitting element, a photosensitive element, and a control unit. The first illuminating element has a first illuminating period, the second illuminating element has a second illuminating period, and the second illuminating element and the first illuminating element are in a different color system, and the photosensitive element respectively senses the illuminating of the first illuminating element The intensity and the illuminating intensity of the second illuminating element are at least twice to obtain at least two first sensing signals and at least two second sensing signals, and the control unit receives and according to the first sensing signals and the second sensations A test signal to control or compensate for the luminous intensity of the first illuminating element and the second illuminating element. Further, in order to achieve the above object, a liquid crystal display device according to the present invention comprises a liquid crystal display panel and a backlight module. The backlight module is disposed on one side of the liquid crystal display panel and has a first light-emitting element, a second light-emitting element, a light-sensing element and a control unit. The first light-emitting element has a first light-emitting period. The second illuminating element has a second illuminating period, and the first illuminating element and the second illuminating element are in a different color system, and the photosensitive element senses the illuminating intensity of the first illuminating element and the illuminating intensity of the second illuminating element respectively. Secondly, to obtain at least two first sensing signals and at least two second sensing signals, the control unit receives and controls the first light-emitting elements and the second according to the first sensing signals and the second sensing signals. The luminous intensity of the illuminating element. According to the above, a liquid crystal display device, a backlight module, and a backlight module control method according to the present invention are characterized in that a first light-emitting element having a first light-emitting period and a second light-emitting element are sensed by a photosensitive element. The second illuminating element of the period has a luminous intensity of at least two times to obtain at least two first sensing signals and at least two second sensing signals, so that the control unit can calculate and calculate the first sensing signal and the second sensing signal. To control or compensate the luminous intensity of the first illuminating element and the second illuminating element. In this way, a plurality of light-emitting elements of different color systems can be sensed by one photosensitive element and sensed at least twice, and then the plurality of sensing signals obtained can be calculated to control or compensate each of the light-emitting elements. The luminous intensity can not only save cost and space for circuit use, but also effectively control or compensate for the appropriate luminous intensity of the light-emitting element. [Embodiment] Hereinafter, a liquid crystal display device, a backlight module, and a control method of a backlight module according to a preferred embodiment of the present invention will be described with reference to the related drawings. Referring to FIG. 3, a liquid crystal display device 4 according to a preferred embodiment of the present invention includes a liquid crystal display panel 5 and a backlight module 6. The backlight module 6 is disposed on one side of the liquid crystal display panel 5, and the backlight module 6 can be a direct-type backlight module or a side-light backlight module, which is a direct-lit backlight module. The group is an example. The backlight module 6 has a circuit board 61, a diffusion plate 62, an optical film group 63 and a casing 64. The circuit board 61 is disposed on the housing 64, and the diffusion plate 62 is disposed opposite to the circuit board 61, and the optical film group 63 is disposed opposite to the diffusion plate 62. In this embodiment, the optical film set 63 can have an upper diffusion film, a brightness enhancement film, and a lower diffusion film (not shown). The upper diffusion film and the lower diffusion film are opposite to each other, and the brightness enhancement film system is disposed. Between the upper diffusion film and the lower diffusion film. The circuit board 61 has a first light emitting element Du, a second light emitting element D12, a third light emitting element D13, a photosensitive element 611 and a control unit 612' disposed on the circuit board 61 and on the circuit board 61. The circuit wiring is electrically connected (not shown). Of course, the photosensitive element 611 and the control unit 612 of the present embodiment can be disposed on the surface of the circuit board 61 different from the first light-emitting element du, the second light-emitting element D12, and the third light-emitting element 〇13 (not shown). Alternatively, the photosensitive element 611 and the control unit 612 may be disposed on another circuit board, and then electrically connected to the circuit board 61 (not shown). The first light-emitting element D11, the second light-emitting element 〇12, and the third light-emitting element D13 respectively emit light of different color systems, for example, red light, blue light, and green light, and may be respectively a light-emitting two in implementation. The polar body, for example, 200820187 is a red light emitting diode, a color light emitting diode or a green light emitting diode, and the backlight module 6 has a plurality of first light emitting elements D11 and a plurality of The second light-emitting element D12 and the plurality of third light-emitting elements! ^^ are taken as an example. The photosensitive element 611 can be a photo sensor, a photoresistor, a phototransistor or a photodiode, and is configured to respectively sense the first illuminating element D11, the second illuminating element D12 and the third The luminous intensity of red, blue and green light emitted by the light-emitting element D13 (as shown in FIG. 4). And sensing the number of times of at least two times, and after sensing the luminous intensity of the first light-emitting element D11, the second light-emitting element D12, and the third light-emitting element D13, respectively obtaining at least two first sensing signals, at least one The younger one is a sensing signal and at least two third sensing signals (not shown). That is, the number of sensing times of each of the light-emitting elements is the same as the number of the first sensing signal, the second sensing signal, or the third sensing signal obtained. Of course, the first sensing signal and the second sensing The number of the test signal or the third sensing signal may be the same or different, and is determined according to the needs of the user. Therefore, in the present embodiment, the number of times of sensing of the first light-emitting element dii, the second light-emitting element D12, or the third light-emitting element D13 by the photosensitive element 611 is 4 times. The control unit 612 receives and separately controls the first light-emitting element Du, the second light-emitting element D12, and the third light-emitting element Di3 according to each of the first sensing signals, the second sensing signals, and the third sensing signals. The intensity of the light. The control unit 612 of this embodiment can be implemented as a processor. Referring to FIG. 5A to FIG. 5C, the first light-emitting element 11 200820187
Dll係具有一第一發光週期T1，第二發光元件D12係具有 一第二發光週期Τ2，而第三發光元件D13係具有一第三 發光週期Τ3。在此所述的第一發光週期Τ1、第二發光週 期Τ2及第三發光週期Τ3即是指第一發光元件D11、第二 發光元件D12及第三發光元件D13於發射光線開始至結束 的時間，即發光的工作時間（duty cycle)。其中，第一發光 週期T卜第二發光週期T2及第三發光週期T3，於實施上 係可為依序並互相錯開，意即，於同一期間僅有一種顏色 的發光二極體處於發光狀態。當然，第一發光週期T1、第 二發光週期T2與第三發光週期T3亦可部份重疊，且第一 發光週期T1、第二發光週期T2及第三發光週期T3之時 間長度係分別不相同，意即，於同一期間可有不同顏色的 發光二極體同時發光。然而，當感光元件611於感測發光 元件之發光強度的期間，僅能有同一種顏色的發光二極體 處於發光狀態。 以下請參照圖5A至圖5C，以簡介本實施例之感光元 件611感測第一發光元件D11、第二發光元件D12及第三 發光元件D13之控制方式。 如圖5A所示，本實施例之感光元件611感測第一發 光元件D11、第二發光元件D12及第三發光元件之控 制方式如下··當第一發光元件D11、第二發光元件Dl2及 第三發光元件D13係為依序並相互錯開的發光時，感光元 件611係於第一發光元件D11之第一發光週期T1、第一 發光元件D12之第二發光週期T2或第三發光元件Dl3之 12 200820187 第一發*光週期T3開始時，亦同時開始感測第一發光元件 、弟 ^光元件D12或第三發光元件£)13之發光強 度，並各感測4次。 、如圖5Β所示’另一控制方式係為’感光元件611係 分別於第一發光週期T1、第二發光週期Τ2或第三發光週 期Τ3開始後，經過一間隔時間t，才開始感測第一發光元 件D11、第二發光元件D12或第三發光元件D13之發光強 度。如此一來，將可有效減少不必要之光線的雜訊干擾， 例如受到非本次欲感測之發光元件所產生之光線的干擾。 \ 再如圖5C所示，又一控制方式係為，第一發光週期 T1、第二發光週期T2及第三發光週期T3係部分重疊。於 第二發光元件D12及第三發光元件D13停止發光後，且第 一發光元件D11持續發光的同時，感光元件611係感測第 一發光元件DU之發光強度；於第一發光元件D11及第三 發光元件D13停止發光後，且第二發光元件D12持續發光 的同時，感光元件611係感測第二發光元件〇12之發光強 度；於第/發光元件D11及第二發光元件D12停止發光 後，且第三發光元件D13持續發光的同時，感光元件611 係感測第三發光元件D13之發光強度。 承上所述，於感光元件611感測發光強度之後，係分 別取得四個第一感測訊號、四個第二感測訊號及四個第三 感測訊號，旅分別傳送至控制單元612，而控制單元612 係分別依據旅計算第一感測訊號、第二感測訊號及第三感 測訊號，以分別控制或補償第一發光元件D11、第二發光 13 200820187 元件D12及第三發光元件D13之發光強度。 控制單元612的計算方式，係為分別計算第一感測訊 號、第二感測訊號或第三感測訊號之總和，再將第一感測 訊號、第二感測訊號或第三感測訊號之總和值加以平均， 以分別取得第一感測訊號之第一平均值、第二感測訊號之 第二平均值及第三感測訊號之第三平均值’並依據第一平 均值、第二平均值及第三平均值以分別控制或補償第一發 光元件D11、第二發光元件D12及第三發光元件D13之發 光強度。 另外，控制單元612之計算方式，亦可為分別比較所 有的第一感測訊號、所有的第二感測訊號及所有的第三感 測訊號，以於其中取得第一感測訊號之一第一中間值、第 二感測訊號之一第二中間值及第三感測訊號之一第三中 間值，並依據第一中間值、第二中間值及第三中間值以控 制或補償第一發光元件D11、第二發光元件D12及第三發 光元件D13之發光強度。 本實施例係藉由一個感光元件611感測第一發光元件 D11、第二發光元件D12及第三發光元件D13之發光強度 至少二次，以取得至少二第一感測訊號、至少二第二感測 訊號及至少二第三感測訊號，此種方式，係藉由一個感光 元件611就可感測多個發光元件且分別感測至少二次，再 藉由計算所取得之多個感測訊號，以控制或補償各發光元 件Dll、D12或D13所適合或無誤差的發光強度，故不僅 可節省成本及電路使用空間，更能有效地控制或補償各發 14 200820187 光70件Dll、D12或D13之適當地發光強度。 以上，係針對本發明較佳實施例之液晶顯示裝置及其 背光模組的詳細說明。以下，將針對背光模組的控制方法 加以說明。 請參照圖6所示，本發明較佳實施例之一種背光模組 之控制方法係應用於上述較佳實施例之液晶顯示裝置4之 背光模組6(如圖3所示），而背光模組之要部元件皆與上述 實施例相同。而本實施例之控制方法係包括步驟s〇i至 S03。 步驟S01，係感測第一發光元件D11之發光強度至少 二次，以取得至少二第一感測訊號；步驟S02，係感測第 二發光元件D12之發光強度至少二次，以取得至少二第一 感測訊號；步驟S03，係依據該等第一感測訊號及該等第 二感測訊號，以分別控制或補償第一發光元件Dn及第一 發光元件D12之發光強度。 — % 請參照圖7所示，本實施例之控制方法更包含步驟su 與 S12。 步驟S11，係感測第三發光元件D13之發光強度至少 二次，以取得至少二第三感測訊號；步驟S12，係依據該 等第三感測訊號，以控制或補償第三發光元件D13之發光 強度0 x 此外，本實施例之控制方法係於取得至少二第一感測 訊號、至少二第二感測訊號及至少二第三感測訊號之步驟 後，更可藉由分別比較第-感測訊號、第二感測訊號及第 15 200820187 f 三感測訊號以取得一第一中間值、一第二中間值及一第三 中間值’再依據第-中間值、第二中間值及第三中間值以 控制或補彳員第一發光元件Du、第二發光元件D12及第= 發光兀件D13之發光強度。當然，控制方法亦可藉由分別 計异第-感測訊號、第二感㉚訊號及第三感測訊號之總和 後再分別平均，以取得一第一平均值、一第二平均值及〜 第三平均值，再依據第-平均值、第二平均值及第三 值以控制或補償第一發光元件Dll、第二發光元件Du 第三發光元件D13之發光強度。The Dll has a first light-emitting period T1, the second light-emitting element D12 has a second light-emitting period Τ2, and the third light-emitting element D13 has a third light-emitting period Τ3. The first lighting period Τ1, the second lighting period Τ2, and the third lighting period Τ3 described herein refer to the time from the start to the end of the first light-emitting element D11, the second light-emitting element D12, and the third light-emitting element D13. , that is, the duty cycle of the light. The first illuminating period T, the second illuminating period T2, and the third illuminating period T3 may be sequentially and mutually staggered in practice, that is, only one color of the illuminating diode is in a illuminating state during the same period. . Certainly, the first lighting period T1, the second lighting period T2, and the third lighting period T3 may also partially overlap, and the lengths of the first lighting period T1, the second lighting period T2, and the third lighting period T3 are different. That is, the light-emitting diodes of different colors can be simultaneously illuminated during the same period. However, when the photosensitive element 611 senses the luminous intensity of the light-emitting element, only the light-emitting diode of the same color can be in a light-emitting state. Referring to FIG. 5A to FIG. 5C, the photosensitive element 611 of the present embodiment is used to sense the control modes of the first light-emitting element D11, the second light-emitting element D12, and the third light-emitting element D13. As shown in FIG. 5A, the photosensitive element 611 of the present embodiment senses the first light-emitting element D11, the second light-emitting element D12, and the third light-emitting element in the following manner: · When the first light-emitting element D11 and the second light-emitting element D12 and When the third light-emitting element D13 is sequentially and mutually shifted, the photosensitive element 611 is tied to the first light-emitting period T1 of the first light-emitting element D11, the second light-emitting period T2 of the first light-emitting element D12, or the third light-emitting element D13. 12 200820187 At the beginning of the first light* photo period T3, the light-emitting intensity of the first light-emitting element, the light-emitting element D12 or the third light-emitting element £) 13 is also sensed at the same time, and each is sensed four times. As shown in FIG. 5A, the other control mode is that the photosensitive element 611 starts sensing after an interval time t after the first light-emitting period T1, the second light-emitting period Τ2, or the third light-emitting period Τ3 starts. The luminous intensity of the first light-emitting element D11, the second light-emitting element D12, or the third light-emitting element D13. In this way, noise interference of unnecessary light can be effectively reduced, for example, by light generated by a light-emitting element that is not intended to be sensed. Further, as shown in FIG. 5C, another control mode is such that the first lighting period T1, the second lighting period T2, and the third lighting period T3 are partially overlapped. After the second light-emitting element D12 and the third light-emitting element D13 stop emitting light, and the first light-emitting element D11 continues to emit light, the photosensitive element 611 senses the light-emitting intensity of the first light-emitting element DU; and the first light-emitting element D11 and the first light-emitting element D11 After the third light-emitting element D13 stops emitting light, and the second light-emitting element D12 continues to emit light, the photosensitive element 611 senses the light-emitting intensity of the second light-emitting element 12; after the second/light-emitting element D11 and the second light-emitting element D12 stop emitting light While the third light-emitting element D13 continues to emit light, the photosensitive element 611 senses the light-emitting intensity of the third light-emitting element D13. After the sensing element 611 senses the luminous intensity, the four first sensing signals, the four second sensing signals, and the four third sensing signals are respectively obtained, and the brigade is separately transmitted to the control unit 612. The control unit 612 calculates the first sensing signal, the second sensing signal and the third sensing signal respectively according to the brigade to respectively control or compensate the first light emitting element D11, the second light emitting unit 13, 200820187, the element D12 and the third light emitting element. The luminous intensity of D13. The control unit 612 calculates the sum of the first sensing signal, the second sensing signal, or the third sensing signal, and then the first sensing signal, the second sensing signal, or the third sensing signal. And summing the values to obtain a first average value of the first sensing signal, a second average value of the second sensing signal, and a third average value of the third sensing signal respectively, and according to the first average value, The two average values and the third average value respectively control or compensate the luminous intensities of the first light-emitting element D11, the second light-emitting element D12, and the third light-emitting element D13. In addition, the control unit 612 can calculate the first sensing signals, all the second sensing signals, and all the third sensing signals, respectively, to obtain one of the first sensing signals. An intermediate value, a second intermediate value of the second sensing signal, and a third intermediate value of the third sensing signal, and controlling or compensating the first according to the first intermediate value, the second intermediate value, and the third intermediate value The luminous intensity of the light-emitting element D11, the second light-emitting element D12, and the third light-emitting element D13. In this embodiment, the light-emitting intensity of the first light-emitting element D11, the second light-emitting element D12, and the third light-emitting element D13 is sensed by at least two times to obtain at least two first sensing signals, at least two second. a sensing signal and at least two third sensing signals. In this manner, a plurality of light emitting elements are sensed by one photosensitive element 611 and sensed at least twice, and then multiple sensings are obtained by calculation. The signal is used to control or compensate the light-emitting intensity of each of the light-emitting elements D11, D12 or D13, which is suitable or error-free, so that not only cost and circuit space can be saved, but also more effective control or compensation for each of the 14 200820187 light 70 pieces Dll, D12 Or the appropriate luminous intensity of D13. The above is a detailed description of a liquid crystal display device and a backlight module thereof according to a preferred embodiment of the present invention. Hereinafter, a control method of the backlight module will be described. Referring to FIG. 6 , a control method of a backlight module according to a preferred embodiment of the present invention is applied to a backlight module 6 of the liquid crystal display device 4 of the preferred embodiment (shown in FIG. 3 ), and a backlight module. The components of the group are the same as those of the above embodiment. The control method of this embodiment includes steps s〇i to S03. Step S01, sensing the luminous intensity of the first light-emitting element D11 at least twice to obtain at least two first sensing signals; and step S02, sensing the luminous intensity of the second light-emitting element D12 at least twice to obtain at least two The first sensing signal is determined according to the first sensing signals and the second sensing signals to respectively control or compensate the luminous intensity of the first light emitting element Dn and the first light emitting element D12. - % Please refer to FIG. 7, the control method of this embodiment further includes steps su and S12. Step S11, sensing the illuminating intensity of the third illuminating element D13 at least twice to obtain at least two third sensing signals; and step S12, according to the third sensing signals, to control or compensate the third illuminating element D13 The illuminating intensity of the present invention is further improved by the steps of obtaining at least two first sensing signals, at least two second sensing signals, and at least two third sensing signals. a sensing signal, a second sensing signal, and a 15th 200820187f three sensing signal to obtain a first intermediate value, a second intermediate value, and a third intermediate value, and then based on the first intermediate value and the second intermediate value And a third intermediate value to control or supplement the luminous intensity of the first light-emitting element Du, the second light-emitting element D12, and the third light-emitting element D13. Of course, the control method can also average the difference between the different sense-sensing signal, the second sense 30 signal, and the third sense signal, respectively, to obtain a first average value, a second average value, and ~ The third average value is further controlled or compensated for the luminous intensity of the first light-emitting element D11 and the second light-emitting element Du by the third light-emitting element D13 according to the first-average value, the second average value, and the third value.
由於本實施例之背光模級係與前述實施例之液 示裝置4之背光模組6(如圖3所示）具有相同構件、特徵與 功效，而背光模組之控制方法係藉由比較或計算各感測訊 號之方式亦於前述實施例中詳述，故於此不再贅述。D 綜上所述，因依據本發明之一種液晶顯示装置及其背 光模組、背光模組之控制方法，係藉由一個感光元件 測具有第一發光週期之第一發光元件、具有第二發光週期 之第一發光元件及具有第三發光週期之第三發光元件之 發光強度至少二次，以得到至少二第一感測訊號至少二第 二感測訊號及至少二第三感測訊號，以使控制單元可:據 並計算第一感測訊號、第二感測訊號及第三感測訊號， 控制或補償第一發光元件、第二發光元件或第三發^元件 之發光強度。此種方式，係藉由一個感光元件就可感測多 個不同色系的發光元件且分別感測至少二次，再藉由 所取得之多個感測訊號，以控制或補償各發光元：的 16 200820187 強度，故不僅可節省成本及電路使用空間，更能有效地控 制或補償發光元件之適當的發光強度。 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1為顯示習知之一種液晶顯示裝置之示意圖； 圖2為顯示習知之第一感光元件、第二感光元件及第 三感光元件分別感測第一發光元件、第二發光元件及第三 發光元件之發光強度之示意圖； 圖3為顯示依本發明較佳實施例之一種液晶顯示裝 置； 圖4為顯示依本發明較佳實施例之感光元件分別感測 第一發光元件、第二發光元件及第三發光元件之發光強度 之不意圖， 圖5A至圖5C為顯示依本發明較佳實施例之感光元件 於第一發光週期、第二發光週期及第三發光週期之感測示 意圖， 圖6為顯示依本發明較佳實施例之一種背光模組之控 制方法之流程圖；以及 圖7為顯示依本發明較佳實施例之一種背光模組之控 制方法，係感測第三發光元件之流程圖。 17 200820187 元件符號說明： 1 :液晶顯示裝置 2 ·液晶顯不面板 3 :背光模組 31 :擴散板 32 :電路板 321 :紅色感光元件 322 :綠色感光元件 323 :藍色感光元件 324 ··控制單元 33 :殼體 4 :液晶顯示裝置 5 ·液晶顯不面板 6:背光模組 61 :電路板 611 :感光元件 612 ··控制單元 62 :擴散板 63 :光學膜片組 64 :殼體 C1 :紅色彩色濾光層 C2 :綠色彩色濾光層 C3 :藍色彩色濾光層 D01 :紅色發光二極體 18 200820187 D02 :綠色發光二極體 D03 :藍色發光二極體 D11 :第一發光元件 D12 :第二發光元件 D13 :第三發光元件 T1 :第一發光週期 T2 :第二發光週期 T3 :第三發光週期 —t :間隔時間 S01 -S03、S11-S12 :控制方法之步驟 19Since the backlight module of the embodiment has the same components, features and functions as the backlight module 6 of the liquid display device 4 of the foregoing embodiment (as shown in FIG. 3), the control method of the backlight module is compared or The manner of calculating the respective sensing signals is also detailed in the foregoing embodiments, and thus will not be described herein. In summary, according to a liquid crystal display device, a backlight module thereof, and a backlight module control method according to the present invention, a first light-emitting element having a first light-emitting period and a second light-emitting element are measured by a photosensitive element. And illuminating at least two times of the first illuminating element and the third illuminating element having the third illuminating period to obtain at least two second sensing signals and at least two third sensing signals The control unit can: control and compensate for the luminous intensity of the first, second, or third elements according to the first sensing signal, the second sensing signal, and the third sensing signal. In this way, a plurality of light-emitting elements of different color systems can be sensed by one photosensitive element and sensed at least twice, and then the plurality of sensing signals obtained are used to control or compensate each of the light-emitting elements: The strength of 16 200820187 not only saves cost and space for circuit use, but also effectively controls or compensates for the appropriate luminous intensity of the illuminating element. The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a conventional liquid crystal display device; FIG. 2 is a view showing a first light-sensing element, a second light-sensing element, and a third light-sensing element respectively sensing a first light-emitting element and a second light-emitting device; FIG. 3 is a view showing a liquid crystal display device according to a preferred embodiment of the present invention; FIG. 4 is a view showing a photosensitive element sensing a first light emitting device according to a preferred embodiment of the present invention; The light-emitting intensity of the second light-emitting element and the third light-emitting element are not intended. FIG. 5A to FIG. 5C are diagrams showing the photosensitive element according to the preferred embodiment of the present invention in the first light-emitting period, the second light-emitting period, and the third light-emitting period. FIG. 6 is a flow chart showing a control method of a backlight module according to a preferred embodiment of the present invention; and FIG. 7 is a diagram showing a control method of a backlight module according to a preferred embodiment of the present invention. A flow chart for measuring a third illuminating element. 17 200820187 Description of component symbols: 1 : Liquid crystal display device 2 · Liquid crystal display panel 3 : Backlight module 31 : Diffuser plate 32 : Circuit board 321 : Red photosensitive element 322 : Green photosensitive element 323 : Blue photosensitive element 324 · · Control Unit 33: Case 4: Liquid crystal display device 5: Liquid crystal display panel 6: Backlight module 61: Circuit board 611: Photosensitive element 612 · Control unit 62: Diffuser plate 63: Optical film group 64: Case C1: Red color filter layer C2: green color filter layer C3: blue color filter layer D01: red light-emitting diode 18 200820187 D02: green light-emitting diode D03: blue light-emitting diode D11: first light-emitting element D12: second light-emitting element D13: third light-emitting element T1: first light-emitting period T2: second light-emitting period T3: third light-emitting period-t: interval time S01-S03, S11-S12: step 19 of the control method