1363226 P070728BEZ1TW 26705twf.doc/n 九、發明說明： 【發明所屬之技術領域】 . 本發明是關於一種平面顯示技術，且特別是有關於一 • 種液晶顯示器及其發光二極體背光模組驅動裝置與方法。 【先前技術】 隨者光電與半導體技術的演進，所以帶動了平面顯示 器之蓬勃發展，而在諸多平面顯示器中，液晶顯示器因具 φ 有咼空間利用效率、低消耗功率、無輻射以及低電磁干擾 等優越特性，隨即已成為市場之主流。液晶顯示器一般包 括液晶顯示面板與背光模組，而由於液晶顯示面板本身並 不具備自發光的特性，因此必須將背光模組配置在液晶顯 示面板下方’藉以提供液晶顯示面板所需之光源，如此液 日曰顯不器才能顯示影像給使用者觀看。 近年來’由於使用者對於液晶顯示器所能呈現的色彩 變化與影像品質之需求越來越高，所以眾家業者無不為了 此需求而努力琢磨著。—般而言，為了要提升液晶顯示器 所能呈現的色彩變化與影像品質之需求，最直接的想法就 疋必須要k升液晶顯示器的色域（c〇l〇r gamut)，而習知 為了要提升液晶顯示器的色域，眾家業者除了會從彩色濾 光基板（color filter)著手外，且更會利用具有較高色彩純 度的發光一極體背光模組（LED backlight module)來取代 習知所慣用之發白光的背光模組，如此即可有效地提升液 晶顯示器的色域。 以本發明領域具有通常知識者應當熟識所謂的色域是 5 1363226 P070728BEZ1TW 26705twf.doc/n 由國際照明協會（Commission International Del E'claimge CIE)於1931年所制定的’⑹圖丨所示，且該協會所制定 - 出的色域範圍為圖1中的區域A。基本上，任何顏色的色 • 域座標皆會以（x，y)座標來表示之，且在色域座標上由 三個基本色（亦即紅、綠及藍）所圍成的三角形之區域B 就是，晶顯示器所能呈現之顏色變化的範圍，而此範圍也 代表著液晶顯不器的色域。因此，只要將此三角形所構成 • 的區域B加大，則代表液晶顯示器之色域就會越廣，如此 液晶顯示器所能呈現的色彩變化與影像品質就會提升。 —而為了要加大所述三角形所構成的區域B之範圍，眾 豕業者已發展出-種多邊形色域的概念，於此請先合併參 照，1及圖2，對此多邊形色域之概念最直接的轉方式 就是將習知由三個基本色（亦即紅、綠及藍）所圍成的三 角形之區域B轉由四個基本色（亦即紅、藍及*同波長的 兩個綠）來圍成一個四邊形之區域B，，如此方式不但可以 巧液晶顯示ϋ的色域變廣’且更可以有效地提升液晶顯 器所能呈現的色彩變化與影像品質。 曰再者，當習知所發展出的多邊形色域之概念欲落諸於 液晶顯示器時’其必須於傳統的發光二極體背光模多且内多 增設:組不同於以往所採用的綠色發光二極體之波長的綠 色發光二極體。也就是說，改良過後的發光二極體背光模 組會具有紅色發光二極體、藍色發光二極體，以及兩種不 同波長的綠色發光二極體（例如：波長為520nm的綠色發 光-極體與波長為53〇nm的綠色發光二極體）。如此將不 6 1363226 P070728BEZ1TW 26705twf.doc/n 同波長的兩綠色發光二極體，配合紅、藍兩色發光二極體 進行混色後’即可使人眼感受到四邊形的色域範圍。 然而’依據上述所揭示的内容可知，為了要讓液晶顯 示器之色域達到多邊形色域之目的，傳統的發光二極體背 光模組内必須多增設一組不同於以往所採用的綠色發光二 極體之波長的綠色發光二極體，如此將會導致發光二極體 背光模組整體之設計成本增加。1363226 P070728BEZ1TW 26705twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to a flat display technology, and more particularly to a liquid crystal display and a light emitting diode backlight module driving device thereof And method. [Prior Art] With the evolution of optoelectronics and semiconductor technology, the development of flat panel displays has been promoted. In many flat panel displays, liquid crystal displays have space utilization efficiency, low power consumption, no radiation and low electromagnetic interference. Such superior characteristics have become the mainstream of the market. The liquid crystal display generally includes a liquid crystal display panel and a backlight module, and since the liquid crystal display panel itself does not have self-luminous characteristics, the backlight module must be disposed under the liquid crystal display panel to provide a light source required for the liquid crystal display panel. The liquid display can not display the image for the user to watch. In recent years, due to the increasing demand for color changes and image quality that liquid crystal displays can provide, the home industry has been striving for this demand. In general, in order to improve the color change and image quality that liquid crystal displays can present, the most direct idea is that you must have a color gamut of the liquid crystal display (c〇l〇r gamut). In order to improve the color gamut of liquid crystal displays, in addition to starting with a color filter, the industry will replace the LED backlight module with higher color purity. Knowing the backlight module that is used to white light, this can effectively improve the color gamut of the liquid crystal display. Those with ordinary knowledge in the field of the invention should be familiar with the so-called color gamut is 5 1363226 P070728BEZ1TW 26705twf.doc/n as shown in the '(6) figure by the International Commission for the Lighting (Commission International Del E'claimge CIE) in 1931, and The color gamut defined by the association is the area A in Figure 1. Basically, any color of the color • domain coordinates will be represented by the (x, y) coordinates, and the area of the triangle surrounded by three basic colors (ie, red, green, and blue) on the gamut coordinates. B is the range of color changes that the crystal display can exhibit, and this range also represents the color gamut of the liquid crystal display. Therefore, as long as the area B formed by the triangle is increased, the color gamut of the liquid crystal display will be wider, so that the color change and image quality which the liquid crystal display can exhibit will be improved. - In order to increase the range of the region B formed by the triangle, the concept of a polygonal color gamut has been developed by the practitioners. Please merge the reference first, and Figure 2, the concept of the polygonal color gamut. The most direct way to transfer is to convert the region B of the triangle surrounded by three basic colors (ie red, green and blue) into four basic colors (ie two red, blue and * same wavelengths). Green) is to form a quadrilateral area B. In this way, not only can the color gamut of the liquid crystal display be widened, but also the color change and image quality that the liquid crystal display can exhibit can be effectively improved. Furthermore, when the concept of the polygonal color gamut developed by the conventional technology is intended to fall into the liquid crystal display, it must be added to the conventional light-emitting diode backlight module and added internally: the group is different from the green light used in the past. A green light-emitting diode of the wavelength of the diode. That is to say, the improved LED backlight module has a red LED, a blue LED, and two different wavelength green LEDs (for example, green light with a wavelength of 520 nm). A polar body and a green light-emitting diode having a wavelength of 53 〇 nm). In this way, the two green light-emitting diodes of the same wavelength can be mixed with the red and blue light-emitting diodes to make the human eye feel the color gamut of the quadrilateral. However, according to the above disclosure, in order to achieve the color gamut of the liquid crystal display, the conventional light-emitting diode backlight module must be additionally provided with a set of green light-emitting diodes different from those used in the past. The green light-emitting diode of the wavelength of the body will increase the overall design cost of the light-emitting diode backlight module.
【發明内容】 有鑑於此’本發明的目的就是提供一種發光二極體背 光模組驅動裝置與方法，其並不需要額外加入其他基本色 的發光二極體於發光二極體背光模組，且僅需採用現今一 般的發光二極體背光模組就可以讓液晶顯示器的色域達到 多邊形色域之目的。 β #本發明的另一目的就是提供一種液晶顯示器，其主要 是藉由運用上述本㈣所提供的發光二鋪背光模組驅動SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a driving device and method for a light-emitting diode backlight module, which does not need to additionally add other basic color light-emitting diodes to the light-emitting diode backlight module. And only need to use the current general LED backlight module to make the color gamut of the liquid crystal display to the polygonal color gamut. Another object of the present invention is to provide a liquid crystal display which is mainly driven by using the light-emitting two-panel backlight module provided by the above (4).
裝置與方法於其中，藉以來提升其所能呈現的色彩變化盥 影像品質。 /' _基於上述及其所欲達成之目❸，本發明提供一種發光 二極體背光模_練置，其包括控鄉元無動單^。 其中，控制單元會依據-切換訊號，岭·供一第 ，訊號與-第二控制訊號。驅動單元會祕至控制單元二 ^其會依據所述第-控制訊號或所述第二㈣ :發光二極體背光模財的至少一第—色彩之發光2 體’稽以致使所述第-色彩之發光二極體能呈現至少兩種 7 1363226 P070728BEZ1TW 26705twf.doc/n 不同波長的第一色彩。 於本發明的一實施例中’驅動單元更會依據所述第一 控制訊號或所述第二控制訊號來驅動發光二極體背光模組 中的至少一第二色彩之發光二極體，藉以致使所述第二色 彩之發光二極體能呈現至少兩種不同波長的第二色彩。 於本發明的一實施例中’驅動單元更會依據所述第一 控制訊號或所述第二控制訊號來驅動發光二極體背光模組 中的至少一第三色彩之發光二極體，藉以致使所述第三色 彩之發光二極體能呈現至少兩種不同波長的第三色彩。 攸另一觀點來看’本發明提供一種發光二極體背光模 ^驅動方法，其包括下列步驟：首先，依據一切換訊號而 交替提供一第一控制訊號與一第二控制訊號。接著，依據 所述第一控制訊號或所述第二控制訊號來驅動發光二極體 背光模組中的至少一第一色彩之發光二極體，藉以致使所 述第一色彩之發光二極體能呈現至少兩種不同波長的第一 色彩。 於本發明的一實施例中’本發明所提供的發光二極體 背光模組驅動方法更包括依據所述第一控制訊號或所述第 二控制訊號來驅動發光二極體背光模組中的至少一第二色 彩之發光二極體，藉以致使所述第二色彩之發光二極體能 王現至少兩種不同波長的第二色彩；以及依據所述第一控 制訊號或所述第二控制訊號來驅動發光二極體背光模組中 的至少一第三色彩之發光二極體，藉以致使所述第三色彩 之發光二極體能呈現至少兩種不同波長的第三色彩。 8 丄363226 P070728BEZ1TW 26705twf.doc/n 於上述本發明的一實施例中’所述切換訊號是由液晶 顯示器的時序控制器所提供。 再從另一觀點來看，本發明提供一種液晶顯示器，其 包括液晶顯示面板、發光二極體背光模組，以及發光二極 體背光模組驅動裝置。其中，液晶顯示面板用以^示一影 像晝面。發光二極體背光模組配置於液晶顯示面板的下 方，且具有至少一第一色彩、一第二色彩及一第三色彩之 發光二極體，用以提供液晶顯示面板所需的面光源。 發光二極體背光模組驅動裝置耦接發光二極體背光模 、卫用以接收一切換訊號，並依據一第一控制訊號或一第 ^控制訊號來各別驅動所述第一色彩、所述第二色°彩及所 述第三色彩的發光二極體，藉以致使所述第-色彩^所述 第二色彩及所述第三色彩的發光二極體能各別呈現 種不同波長的第一色彩、第二色彩及第三色彩。 更勺實施例中’本發明所提供的液晶顯示器 =:2=器，其輕接發光二極體背光模组驅動裝 置用以提供所述切換訊號。 於本發明的一實施例中，發光二極體 置包括控制單元與驅動單元。苴巾，_ _ 、 =’用以依據所述切換訊號而交替 : 控制訊號。驅動單元會輕接控制ί元= 二控制訊號來各別驅動所述第—色彩=戒或f述第 弟-“之發先—極體，猎以致使所述第—色彩 '所述 9 1363226 P070728BEZ1TW 26705twf.doc/n 第二色彩及所述第三色彩之發光二極體能各別呈現至少兩 種不同波長的第一色彩、第二色彩及第三色彩。 • 於本發明的一實施例中，發光二極體背光模組驅動裝 置會内建於時序控制器中。 於上述本發明的一實施例中，所述第一色彩為綠色、 所述第二色彩為藍色，而所述第三色彩為紅色。 於上述本發明的一實施例中，所述第一控制訊號為具 φ 有多數個不同責任週期的脈波寬度調變訊號，而所述第二 控制訊號為一全責任週期的脈波寬度調變訊號。 本發明所提供的發光二極體背光模組驅動裝置與方法 適於驅動現今一般的發光二極體背光模組，其主要是因為 綠、藍兩色發光二極體之晶片材質為三元素半導體材料（其 材料特性為受壓電效應後會產生藍移），而紅色發光二極 體之晶片材質為四元素半導體材料（其材料特性為受熱後 會產生紅移），所以當紅、綠、藍三色發光二極體於相異 兩至，期間觉到不同責任週期的脈波寬度調變訊號驅動 時，二者會於所述兩相異晝面期間各別產生兩相異波長的 紅、綠、藍色，藉此再透過混色後，即可致使人眼所感受 到的色域關為多變形色域，亦即至少四邊形社的色域。 也亦因如此，本發明所提供的發光二極體背光模組驅 f與枝並不需要額外加人其絲本色光二極體 一般的發光二極體背光模組，且僅需採用現今一般 =極體背光模組就可以讓液晶顯示器的色域達到多 / 3之目的’藉此即可提升液晶顯示器所能呈現的色 1363226 26705twf.doc/aThe device and method are used to enhance the color change and image quality that can be presented. /' _ Based on the above and other objects to be achieved, the present invention provides a light-emitting diode backlight module, which comprises a control unit. Among them, the control unit will switch between the signal, the ridge, the first signal, and the second control signal. The driving unit may be secreted to the control unit 2, which may cause the first part according to the first control signal or the second (four): at least one color-emitting light body of the light-emitting diode backlight The color LED can present at least two first colors of different wavelengths of 7 1363226 P070728BEZ1TW 26705twf.doc/n. In one embodiment of the present invention, the driving unit drives the at least one second color LED in the LED backlight module according to the first control signal or the second control signal. The second color light emitting diode is caused to exhibit a second color of at least two different wavelengths. In an embodiment of the present invention, the driving unit drives the at least one third color LED in the LED backlight module according to the first control signal or the second control signal. The light-emitting diode of the third color is caused to exhibit a third color of at least two different wavelengths. Another aspect of the present invention provides a method for driving a light-emitting diode backlight module, which comprises the following steps: First, a first control signal and a second control signal are alternately provided according to a switching signal. And driving the at least one first color LED in the LED backlight module according to the first control signal or the second control signal, so that the first color LED can A first color of at least two different wavelengths is presented. In an embodiment of the present invention, the driving method of the LED backlight module further includes driving the LED backlight module according to the first control signal or the second control signal. At least one second color light emitting diode, such that the second color light emitting diode can display at least two second colors of different wavelengths; and according to the first control signal or the second control signal And driving the at least one third color of the LED in the LED backlight module, so that the LED of the third color can exhibit a third color of at least two different wavelengths. 8 丄 363226 P070728BEZ1TW 26705twf.doc/n In an embodiment of the invention described above, the switching signal is provided by a timing controller of the liquid crystal display. From another point of view, the present invention provides a liquid crystal display comprising a liquid crystal display panel, a light emitting diode backlight module, and a light emitting diode backlight module driving device. Among them, the liquid crystal display panel is used to display an image surface. The LED backlight module is disposed under the liquid crystal display panel and has at least one first color, a second color, and a third color LED to provide a surface light source required for the liquid crystal display panel. The LED backlight module driving device is coupled to the LED backlight module, and is configured to receive a switching signal, and respectively drive the first color according to a first control signal or a second control signal. The second color color and the third color light emitting diode, so that the second color and the third color light emitting diode can respectively display different wavelengths One color, the second color, and the third color. In the embodiment of the present invention, the liquid crystal display provided by the present invention is a light-emitting diode backlight module driving device for providing the switching signal. In an embodiment of the invention, the light emitting diode includes a control unit and a driving unit. The wipes, _ _ , = ' are used to alternate according to the switching signal: control signal. The driving unit will lightly control the ί 元 = two control signals to drive the first - color = ring or f to speak the first brother - "the first to - polar body, hunting to cause the first - color" said 9 1363226 P070728BEZ1TW 26705twf.doc/n The second color and the third color light emitting diode can respectively present at least two different wavelengths of the first color, the second color and the third color. • In an embodiment of the invention The light-emitting diode backlight module driving device is built in the timing controller. In an embodiment of the invention, the first color is green, the second color is blue, and the The third color is red. In an embodiment of the invention, the first control signal is a pulse width modulation signal having a plurality of different duty cycles, and the second control signal is a full duty cycle. The pulse width modulation signal of the invention is suitable for driving the current general LED backlight module, which is mainly because of the green and blue color LEDs. The body of the wafer material is three Semiconductor materials (the material properties of which are blue-shifted by the piezoelectric effect), while the red-emitting diodes are made of a four-element semiconductor material (the material properties are red-shifted after being heated), so red and green The blue three-color light-emitting diodes are different in two, and when the pulse width modulation signals of different duty cycles are sensed, the two will respectively generate two-phase different wavelengths during the two-phase different-surfaces. Red, green, blue, by which the color gamut is perceived by the human eye as a multi-deformation color gamut, that is, at least the color gamut of the quadrilateral society. Also, the present invention provides The light-emitting diode backlight module drives the f and the branch without the need to additionally add a light-emitting diode of the light-emitting diode, and the liquid crystal display can be made only by using the current general-purpose polar backlight module. The color gamut reaches the goal of more / 3 'by this, the color that can be presented by the liquid crystal display can be improved 1363226 26705twf.doc/a
P070728BEZ1TW 彩變化與影像品質。 為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉本發明之較佳實施例，並配合所附圖式， 作詳細說明如下。 【實施方式】 本發明所欲達成主要技術功效為加大液晶顯示器之色 域’藉以提升液晶顯示器所能呈現的色彩變化與影像品 質，並且降低製造成本。而以下内容將針對本案之技術特 徵與所欲達成之功效做一詳加描述，以提供給本發明相關 領域之技術人員參詳。 圖3繪示為本發明一實施例之液晶顯示器3〇〇的系統 方塊圖。請參照圖3 ’液晶顯示器300包括液晶顯示面板 (LCD panel) 3(M、發光二極體背光模組（LED backlight module) 303、發光二極體背光模組驅動裝置3〇5、時序控 制器（timing controller) 307、閘極驅動器（gate driver) 309 ’以及源極驅動器（sourcedriver) 311。其中，閘極驅 動器309受控於時序控制器307，藉以來逐一開啟液晶顯 示面板301内的每一列晝素（未繪示）。 源極驅動器311亦受控於時序控制器307，藉以提供 對應的資料電壓（或謂晝素電壓）給液晶顯示面板3〇1内 被閘極驅動器309開啟的列晝素。如此’當源極驅動器3u 完成提供對應的資料電壓給液晶顯示面板301内的最後一 列晝素時’發光二極體背光模組303就會提供液晶顯示面 板301所需的光源’藉以致使液晶顯示面板3〇ι顯示影像 11 1363226 P070728BEZ1TW 26705twf.doc/n 畫面給使用者觀看。 於本實施例中’發光二極體背光模組303配置於液晶 顯示面板301的下方，且具有第一色彩（亦即綠色）之發 光二極體G、第二色彩（亦即藍色）之發光二極體b，以 及第三色彩（亦即紅色）之發光二極體r。如上所述，發 光二極體背光模組303主要是用以提供液晶顯示面板3〇1 所乾的光源’且此發光一極體背光模組303與現^ —般的 發光二極體背光模組之結構相同，故在此並不再加以贅述 之。 除此之外，本實施列亦可於源極驅動器311每提供一 筆對應的資料電壓給液晶顯示面板301的每一列晝素後， 發光二極體背光模組303即提供所需的光源。或者，在源 極驅動器311提供資料電壓給液晶顯示面板3〇1内的晝素 時’發光二極體背光模組303會同時提供液晶顯示面板3〇i 所需的光源，同樣可致使液晶顯示面板3〇1顯示影像畫面。 圖4繪示為本發明一實施例之發光二極體背光模組驅 動裝置305的方塊圖。請合併參照圖3及圖4，本實施例 之發光一極體方光模組驅動裝置305會麵接至發光二極體 背光模組303與時序控制器307，且包括控制單元4〇1與 驅動單元403。其中，控制單元401耦接時序控制器3〇7, 用以接收由時序控制器3 07所提供的切換訊號s s (例如起 始脈衝STV，但並不限制於此），而交替提供第一控制訊 號CS1與第二控制訊號CS2。 於本實施例中，假設控制單元401於液晶顯示器3〇〇 12 1363226 P070728BEZ1TW 26705twf.doc/n 的第N個畫面期間為提供第一控制訊號csi時，則控制單 元401會於液晶顯示器300的第（N+1)個畫面期間轉為 • 提供第二控制訊號CS2，但並不侷限於此。也就是說，控 • 制單元401亦可於液晶顯示器300的第N個晝面期間提供 弟一控制訊號CS2，且於液晶顯不器的第（N+1)個書面 期間轉為提供第一控制訊號CS1。其中，N為正整數。 另外，控制單元401所提供的第一控制訊號CS1為具 • 有多數個不同責任週期（duty cycle)的脈波寬度調變訊號 (pulse width modulation signal, PWM signal )，而控制單 元401所提供的第二控制訊號CS2為全責任週期（full duty cycle)的脈波寬度調變訊號。 請繼續參照圖3及圖4，驅動單元4〇3會耦接控制單 元401與發光二極體背光模組3〇3，且其會依據控制單元 401所提供的第一控制訊號CS1或第二控制訊號cs2，來 各別驅動綠、藍、紅三色發光二極體G、B、R，藉以致使 綠、藍、紅三色發光二極體G、B、R能各別呈^至少兩 P 種不同波長的綠、藍、紅色。 至此，為何綠、藍、紅三色發光二極體G、B、R受 到不同責任週期的脈波寬度調變訊號驅動時，三者會於液 晶顯示器300的兩相異晝面期間各別產生兩相昱&長之 綠、藍、紅色，以下將舉出具體理由與實驗數據給本“ 相關領域之技術人員參詳。 首先解釋的是，綠、藍兩色發光二極體G、B之晶片 (chip)材質—般為三元素半導體材料，例如為氮化=嫁 13 1363226 P070728BEZ1TW 26705twf.doc/n (InGaN) ’此類三元素半導體材料的特性為受壓電效應 後會產生藍移現象，亦即其所發的光有偏藍的現象。另外， 紅色發光二極體R之晶片材質一般為四元素半導體材料， 例如為鋁銦鎵碟化物（AilnGaP)，此類四元素半導體材 料的特性為受熱後會產生紅移現象。 故依據綠、藍、紅三色發光二極體G、B、R本身晶 片材質的不同，本實施例會將驅動綠、藍、紅三色發光二 極體G、B、R之平均電流設定為2〇mA與3〇mA (但並不 文限於此設定），且在綠、藍、紅三色發光二極體g、b、 R各別文到全貝任週期（亦即100%責任週期）、8〇%責 任週期、60%責任週期、4〇%責任週期，以及2〇%責任週 期之脈波寬度調變訊號驅動的條件下所作之實驗數據如表 1所示。 紅色發光二 綠色發光二 藍色發光二 波長(nm) 極體R 極體B —電 流(mA) 平均電流(mA) 平均電流(mA) 20 ----- 30 20 30 20 30 100 632.09 632.45 523.71 521.33 458.07 456 94 PWM 80 632.17 632.48 522.79 521.53 457.05 456.41 責任週 60 632.11 632.87 521.29 520.4 456.81 456.01 期(％) 40 632.22 —----- 633.14 5l9j2^ 519.86 456.07 454.43 ____ 20 632.77 633.75 517.63 518.22 453.98 453.68 表1 從表1中應可輕易看出，當驅動綠色發光二極體G之 1363226 P070728BEZ1TW 26705twf.doc/n 平均電流為20mA，且綠色發光二極體（}是受全責任週期 (+即100%責任週期)之脈波寬度調變訊號驅動的條件下，此 時綠色發光二極體G所呈現的波長為523.71nm。另外，當 驅動綠色發光二極體G之平均電流同樣還是2〇mA，但綠 色發光二極體G卻是受20%責任週期之脈波寬度調變訊 號驅動的條件下，此時綠色發光二極體〇所呈現的波長很 明顯地會變為517.63nm。 相似地，當驅動藍色發光二極體B之平均電流為 20mA，且藍色發光二極體B是受全責任週期之脈波寬度 調變訊號驅動的條件下，此時藍色發光二極體B所呈現的 波長為458.07nm。另外，當驅動藍色發光二極體B之平均 電流同樣還是20mA，但藍色發光二極體B卻是受2〇%責 任週期之脈波寬度調變訊號驅動的條件下，此時藍色發光 一極體B所呈現的波長很明顯地會變為453 98nm。 相似地，當驅動紅色發光二極體R之平均電流為 20mA，且紅色發光二極體R是受全責任週期之脈波寬度 調變訊號驅動的條件下，此時紅色發光二極體R所呈現的 波長為632.09nm。另外，當驅動紅色發光二極體R之平均 電流同樣還是20mA，但紅色發光二極體R卻是受2〇%責 任週期之脈波寬度調變訊號驅動的條件下，此時紅色發光 二極體R所呈現的波長很明顯地會變為632 77nm。 X 此外，綠、藍、紅三色發光二極體G、B、R之盆餘 驅動條件的搭配皆可從表1中所清楚看出，故以本發明領 域具有通常知識者應當可藉由上述本實施例之例舉段落而 1363226 P070728BEZITW 26705twf.doc/n 類推出’故在此並不再加以資述之。 經由上述已解釋過綠、藍兩色發光二極體G、B較容 易受壓電效應的影響而產生藍移，而紅色發光二極體R則 較容易受熱的影響而產生紅移。因此，由本實施例之表1 所記錄的實驗數據應可輕易看出，綠、藍兩色發光二極體 G、B在不同責任週期的脈波寬度調變訊號之驅動下，其 各別於液晶顯示器300的兩相異晝面期間所產生的兩相異 波長會明顯於紅色發光二極體R。 也亦因如此’當本實施例之發光二極體背光模組303 之綠、藍、紅三色發光二極體G、B、R受到不同責任週 期的脈波寬度調變訊號驅動時’三者會於液晶顯示器3〇〇 的兩相異晝面期間各別產生兩相異波長之綠、藍、紅色， 藉此再透過混色後，即可致使人眼所感受到的色域範圍為 多變形色域，而以本實施例而言，在較佳的狀況下，液晶 顯示器300之色域至少可以達到五邊形之色域，其繪示如 圖5中之五邊形的區域B，，所示。 於此更值得一提的是，為了要使得綠、藍、紅三色發 光一極體G、B、R受到不同責任週期的脈波寬度調變訊 號驅動後，其各別於液晶顯示器3〇〇的兩相異晝面期間所 呈現的亮度需一致之條件下，本實施例之發光二極體背光 模組驅動裝置305會依據綠、藍、紅三色發光二極體G、 B、R受全責任週期之脈波寬度調變訊號驅動後的平均電 "IL來調整多個非全責任週期（例如80%責任週期、 責任週期、40%責任週期，以及20%責任週期）之脈波寬 16 1363226 P070728BEZ1TW 26705twf.doc/n 度調變訊號的驅動電流’藉以來達到綠、藍、紅三色發光 二極體G、B、R受到不同責任週期的脈波寬度調變訊號 驅動後，其各別於液晶顯示器300的兩相異晝面期間所呈 . 現的亮度還會一致。 圖6繪示為本發明一實施例之發光二極體背光模組驅 動裝置305於液晶顯示器300之兩相異晝面期間所提供的 第一控制訊號CS1與第二控制訊號CS2的波形時序圖。請 • 參照圖6，當綠、藍、紅三色發*二極體G、B、.R於液晶 顯示器300之第N個晝面期間受第二控制訊號c：S2 (亦即 全貴任週期之脈波寬度調變訊號）驅動後的平均電流為 20mA ’且綠、藍、紅三色發光二極體g、b、r於液晶顯 示器300之第（N+1)個晝面期間必須受第一控制訊號CS1 (亦即20%責任週期之脈波寬度調變訊號）驅動時，此時 發光二極體背光模組驅動裝置305則會將綠、藍、紅三色 發光二極體G、B、R於液晶顯示器3〇〇之第（N+1)個晝 _ 面期間受20%責任週期之脈波寬度調變訊號的驅動電流 調整為100mA，藉以使得綠、藍 '紅三色發光二極體^、 B、R於液晶顯示器300之第N個及第（N+1)個晝面期 間各別受全責任週期及20%責任週期之脈波寬度調變訊 號驅動後的平均電流仍然還是為20mA，所以綠、藍、紅 二色發光二極體G、B、R受到不同責任週期的脈波寬度 調變訊號驅動後，其各別於液晶顯示器3〇〇的兩相異晝面 期間所呈現的亮度還會一致。 再者’雖然依據上述實施例的解釋後可知’發光二極 17 1363226 P070728BEZ1TW 26705twf.doc/n 體背光模組驅動裝置305是獨立於液晶顯示器300的系统 當中，但依據本發明的精神，並不限制於此。也就是說， 上述實施例之發光二極體背光模組驅動裝置305於本發0月 另一實施例則是内建於時序控制器307中，藉此同樣可以 達到上述實施例所欲達成的技術功效。關於此點，以本發 明領域具有通常知識者應當可依據上述實施例的教示後， 而類推出將發光二極體背光模組驅動裝置305内建於時序 控制器307的實施方式，故在此並不再加以贅述之。 除此之外’由於現今發光二極體背光模組常配置有白 色發光二極體於其内’但由於白色發光二極體之晶片材質 還是具有三元素半導體材料以及少部份的磷光體 (phosphor)，所以本發明所提出的發光二極體背光模組 驅動裝置305仍然可驅動配置有白色發光二極體的發光二 極體背光模组，藉以讓其所應用的液晶顯示器達到多邊形 色域之目的。 基於上述實施例所揭示的内容，以下將彙整出一種發 光二極體背光模組驅動方法給本發明相關領域之技術人員 參詳。 圖7繪示為本發明一實施例之發光二極體背光模組驅 動方法的流程圖。請參照圖7，本實施例之發光二極體背 光模組驅動方法包括下列步驟：首先，如步驟S7〇1所述， 依據一切換訊號而交替提供一第一控制訊號與一第二控制 訊號。於本實施例中’所述切換訊號是由液晶顯示器的時 序控制器所提供。 1363226 P070728BEZ1TW 26705tWf.d〇c/n 接著，如步驟S703所述，依據所述第一控制訊號或 所述第二控制訊號來驅動發光二極體背光模組中的至少一 •第一色彩（例如綠色）之發光二極體，藉以致使所述第一 色彩（亦即綠色）之發光二極體能呈現至少兩種不同波長 的第一色彩（亦即綠色）。於本實施例中，所述第一控制 訊號為具有多數個不同責任週期的脈波寬度調變訊號，而 所述第二控制訊號為一全責任週期的脈波寬度調變訊號。 • 除此之外，本實施例所提供的發光二極體背光模組驅 動方法並不侷限在僅驅動發光二極體背光模組中的綠色發 光二極體而已。更清楚來說’本發明所提供的發光二極體 背光模組驅動方法更可以依據所述第一控制訊號或所述第 二控制訊號來驅動發光二極體背光模組中的至少一第二色 衫（例如藍色）之發光二極體，藉以致使所述第二色彩（亦 即藍色）之發光二極體能呈現至少兩種不同波長的第二色 彩。相似地’本發明所提供的發光二極體背光模組驅動方 ，法亦可以依據所述第一控制訊號或所述第二控制訊號來驅 動發光二極體背光模組中的至少一第三色彩（例如红色） 之發光二極體，藉以致使所述第三色彩（亦即紅色）之發 光一極體能呈現至少兩種不同波長的第三色彩（亦即红 色）。 ' 紅上所述，本發明所提供的發光二極體背光模組驅動 裝置，方法適於驅動現今一般的發光二極體背光模組，其 主要疋因為綠、藍兩色發光二極體之晶片材質為三元素半 導體材料（其材料特性為受壓電效應後會產生藍移），而 19 1363226 P070728BEZ1TW 26705twf.doc/n 紅色發光—極體之晶片材質為四元素半導體材料（其材料 特性為爻熱後會產生紅移），所以當紅綠、藍三色發光 二極體於相異兩晝面期間受到不同責任週期的脈波寬度調 變訊號驅動時，三者會於所述兩相異晝面期間各別產生兩 相異波長的紅、綠、藍色，藉此再透過混色後，即可致使 人眼所感受到的色域範圍為多變形色域，亦即至少四邊形 以上的色域。 也亦因如此，本發明所提供的發光二極體背光模組驅 動裝置與方法料需魏外加人其他基本色的發光二極體 於現今一般的發光二極體背光模組，且僅需採用現今一般 的發光二極體背光模組就可以讓液晶顯示器的色域達到多 邊形色域之目的，藉此即可提升液晶顯示器所能呈現的色 彩變化與影像品質。 雖然本發明已以較佳實施例揭露如上，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，當可作些許之更動與潤飾，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。 n 【圖式簡單說明】 圖1繪示為國際照明協會（CIE)在1931年所制定出 的色域示意圖。 圖2繪示為習知採用四個基本色所構成的四邊形色域 示意圖。 圖3繪示為本發明一實施例之液晶顯示器的系統方塊 圖。 20 1363226 P070728BEZ1TW 26705twf.doc/n 圖4繪示為本發明一實施例之發光二極體背光模組驅 動襞置的方塊圖。 圖5繪示為本發明一實施例之液晶顯示器之色域圖。 圖6繪示為本發明一實施例之發光二極體背光模組驅 動裝置於液晶顯示器之兩相異晝面期間所提供的第一控制 钒號與第二控制訊號的波形時序圖。 圖7繪示為本發明一實施例之發光二極體背光模組驅 鲁 動方法的流程圖。 【主要元件符號說明】 A ' B ' B’、B” ：色域範圍 · 300 :液晶顯示器 301 :液晶顯示面板 303 :發光二極體背光模組 . 3〇5 :發光二極體背光模組驅動裝置 307 :時序控制器 % 3〇9:閘極驅動器 311 :源極驅動器 401 :控制單元 403 :驅動單元 SS :切換訊號 CS1、CS2 :第—、第二控制訊號 S701〜S703 :本發明一實施例之發光二極體背光模植 驅動方法流程圖的各步驟 21P070728BEZ1TW Color change and image quality. The above and other objects, features, and advantages of the present invention will become more apparent from the <RTIgt; [Embodiment] The main technical effect of the present invention is to increase the color gamut of the liquid crystal display, thereby improving the color change and image quality that the liquid crystal display can exhibit, and reducing the manufacturing cost. The following is a detailed description of the technical features of the present invention and the effects to be achieved, and is provided to those skilled in the relevant fields of the present invention. 3 is a block diagram showing a system of a liquid crystal display device 3 according to an embodiment of the present invention. Please refer to FIG. 3 'The liquid crystal display 300 includes a liquid crystal display panel (LCD panel) 3 (M, LED backlight module 303, LED backlight module driving device 3〇5, timing controller (timing controller) 307, a gate driver 309 'and a source driver 311. The gate driver 309 is controlled by the timing controller 307, and each column in the liquid crystal display panel 301 is turned on one by one. The source driver 311 is also controlled by the timing controller 307 to provide a corresponding data voltage (or voltage) to the column in the liquid crystal display panel 3〇1 that is turned on by the gate driver 309. Thus, when the source driver 3u finishes providing the corresponding data voltage to the last column of pixels in the liquid crystal display panel 301, the 'light-emitting diode backlight module 303 provides the light source required for the liquid crystal display panel 301'. The liquid crystal display panel 3〇 displays the image 11 1363226 P070728BEZ1TW 26705twf.doc/n The screen is displayed to the user. In the embodiment, the LED backlight module 303 is illuminated. a light-emitting diode G having a first color (ie, green), a light-emitting diode b of a second color (ie, blue), and a third color (ie, a red color) disposed under the liquid crystal display panel 301 The light-emitting diode backlight 303 is mainly used to provide the light source of the liquid crystal display panel 3〇1 and the light-emitting one-pole backlight module 303 is The structure of the LED backlight module is the same, so it will not be described here. In addition, the present embodiment can also provide a corresponding data voltage to the liquid crystal display panel 301 for the source driver 311. After each column of pixels, the LED backlight module 303 provides the required light source. Or, when the source driver 311 supplies the data voltage to the cells in the liquid crystal display panel 3〇1, the LED backlight The module 303 can simultaneously provide the light source required for the liquid crystal display panel 3〇i, and can also cause the liquid crystal display panel 3〇1 to display an image screen. FIG. 4 illustrates a light-emitting diode backlight module driving device according to an embodiment of the invention. 305 block diagram. Please Referring to FIG. 3 and FIG. 4 , the LED module 305 of the present embodiment is connected to the LED backlight module 303 and the timing controller 307 , and includes a control unit 4 〇 1 and a driving unit 403 . The control unit 401 is coupled to the timing controller 3〇7 for receiving the switching signal ss provided by the timing controller 307 (eg, the start pulse STV, but is not limited thereto), and alternately providing the first The control signal CS1 and the second control signal CS2. In this embodiment, if the control unit 401 provides the first control signal csi during the Nth screen of the liquid crystal display 3 〇〇 12 1363226 P070728BEZ1TW 26705 twf.doc/n, the control unit 401 may be in the liquid crystal display 300. (N+1) screen periods are changed to • The second control signal CS2 is provided, but is not limited thereto. That is to say, the control unit 401 can also provide the second control signal CS2 during the Nth face of the liquid crystal display 300, and switch to provide the first during the (N+1)th written period of the liquid crystal display. Control signal CS1. Where N is a positive integer. In addition, the first control signal CS1 provided by the control unit 401 is a pulse width modulation signal (PWM signal) having a plurality of different duty cycles, and the control unit 401 provides The second control signal CS2 is a pulse width modulation signal of a full duty cycle. Continuing to refer to FIG. 3 and FIG. 4 , the driving unit 4 〇 3 is coupled to the control unit 401 and the LED backlight module 3 〇 3 , and the first control signal CS1 or the second according to the control unit 401 is provided. Control signal cs2, to drive green, blue, red three-color LEDs G, B, R, so that the green, blue, red three-color LEDs G, B, R can be presented at least two P different wavelengths of green, blue, red. At this point, when the green, blue, and red LEDs G, B, and R are driven by the pulse width modulation signals of different duty cycles, the three will be generated separately during the two phases of the liquid crystal display 300. Two-phase 昱 & Long green, blue, red, the following will give specific reasons and experimental data to the relevant technical personnel in the relevant fields. First explained, the green and blue two-color LEDs G, B The material of the chip is generally a three-element semiconductor material, such as nitriding = marry 13 1363226 P070728BEZ1TW 26705twf.doc/n (InGaN) 'The characteristics of such a three-element semiconductor material are blue-shifted by the piezoelectric effect. That is, the light emitted by the light is bluish. In addition, the material of the red LED R is generally a four-element semiconductor material, such as an aluminum indium gallium dish (AilnGaP), which is a four-element semiconductor material. The characteristic is that red light shift occurs after being heated. Therefore, according to the material of the green, blue, and red light-emitting diodes G, B, and R, the present embodiment will drive the green, blue, and red light-emitting diodes. Average of G, B, and R The current is set to 2 mA and 3 mA (but is not limited to this setting), and the green, blue, and red LEDs g, b, and R are all in the full-bath cycle (ie, 100). The experimental data of the % duty cycle, the 8〇% duty cycle, the 60% duty cycle, the 4〇% duty cycle, and the pulse width modulation signal driven by the 2〇% duty cycle are shown in Table 1. Illuminated two green light two blue light two wavelengths (nm) polar body R body B - current (mA) average current (mA) average current (mA) 20 ----- 30 20 30 20 30 100 632.09 632.45 523.71 521.33 458.07 456 94 PWM 80 632.17 632.48 522.79 521.53 457.05 456.41 Responsibility week 60 632.11 632.87 521.29 520.4 456.81 456.01 period (%) 40 632.22 —----- 633.14 5l9j2^ 519.86 456.07 454.43 ____ 20 632.77 633.75 517.63 518.22 453.98 453.68 Table 1 From the table It should be easy to see in 1 that when the green light-emitting diode G is driven, the 1363226 P070728BEZ1TW 26705twf.doc/n average current is 20mA, and the green light-emitting diode (} is subject to the full responsibility cycle (+ 100% duty cycle). Pulse width modulation signal drive Under the conditions, the green light emitting diode G presented wavelength 523.71nm. In addition, when the average current of driving the green LED G is also 2 mA, the green LED G is driven by the pulse width modulation signal of 20% duty cycle, and then the green LED 2 The wavelength exhibited by the polar body is obviously changed to 517.63 nm. Similarly, when the average current of driving the blue light-emitting diode B is 20 mA, and the blue light-emitting diode B is driven by the pulse width modulation signal of the full duty cycle, the blue light-emitting diode is at this time. Body B exhibits a wavelength of 458.07 nm. In addition, when the average current of driving the blue light-emitting diode B is also 20 mA, the blue light-emitting diode B is driven by the pulse width modulation signal of 2%% duty cycle, at this time, blue The wavelength exhibited by the light-emitting body B becomes apparently 453 98 nm. Similarly, when the average current of driving the red LED R is 20 mA, and the red LED R is driven by the pulse width modulation signal of the full duty cycle, the red LED R is The wavelength presented is 632.09 nm. In addition, when the average current of driving the red LED R is also 20 mA, the red LED R is driven by the pulse width modulation signal of the 2 〇 % duty cycle, at this time, the red LED The wavelength exhibited by the body R obviously becomes 632 77 nm. X In addition, the matching of the driving conditions of the green, blue and red LEDs G, B, and R can be clearly seen from Table 1, so that those having ordinary knowledge in the field of the invention should be able to The above-mentioned examples of the present embodiment are described in the section 1363226 P070728BEZITW 26705twf.doc/n, which is not hereby described. It has been explained above that the green and blue light-emitting diodes G and B are more susceptible to the blue shift by the influence of the piezoelectric effect, and the red light-emitting diode R is more susceptible to heat and red shift. Therefore, the experimental data recorded in Table 1 of the present embodiment should be easily seen, and the green and blue two-color LEDs G and B are driven by the pulse width modulation signals of different duty cycles, respectively. The two-phase different wavelengths generated during the two-phase different planes of the liquid crystal display 300 are apparent to the red light-emitting diode R. Also, when the green, blue, and red three-color light-emitting diodes G, B, and R of the light-emitting diode backlight module 303 of the present embodiment are driven by pulse width modulation signals of different duty cycles, During the two-phase different planes of the liquid crystal display, two different wavelengths of green, blue, and red are respectively generated, so that after the color mixture is transmitted, the color gamut that the human eye perceives is multi-deformed. The color gamut, in the present embodiment, in a preferred situation, the color gamut of the liquid crystal display 300 can at least reach the pentad color gamut, which is shown as the pentagon region B in FIG. Shown. What is more worth mentioning here is that in order to make the green, blue and red light-emitting ones G, B, and R are driven by the pulse width modulation signals of different duty cycles, they are different from the liquid crystal display 3〇. The light-emitting diode backlight module driving device 305 of the embodiment is based on the green, blue, and red light-emitting diodes G, B, and R under the condition that the brightness of the two-phase different surface is the same. The average power "IL driven by the pulse width modulation signal of the full responsibility cycle adjusts the pulse of multiple non-full responsibility cycles (eg 80% duty cycle, duty cycle, 40% duty cycle, and 20% duty cycle) Wave width 16 1363226 P070728BEZ1TW 26705twf.doc/n The drive current of the modulating signal 'has reached the green, blue and red three-color LEDs G, B, R after being driven by the pulse width modulation signal of different duty cycle The brightness exhibited by the two phases of the liquid crystal display 300 during the two phases is also uniform. FIG. 6 is a timing diagram of waveforms of the first control signal CS1 and the second control signal CS2 provided by the driving device 305 of the LED backlight module during the two different phases of the liquid crystal display 300 according to an embodiment of the invention. . Please refer to FIG. 6 , when the green, blue, and red color LEDs, diodes G, B, and .R are subjected to the second control signal c: S2 during the Nth face of the liquid crystal display 300 (ie, all the nobles) The pulse width modulation signal of the cycle) is 20 mA after driving, and the green, blue, and red LEDs g, b, and r must be during the (N+1)th surface of the liquid crystal display 300. When the first control signal CS1 (that is, the pulse width modulation signal of 20% duty cycle) is driven, the LED backlight module driving device 305 will emit green, blue and red LEDs. G, B, and R are adjusted to 100 mA by the pulse current width modulation signal of the 20% duty cycle during the (N+1)th 昼-plane of the liquid crystal display 3〇〇, so that the green and blue 'red three The color light-emitting diodes ^, B, and R are driven by the pulse width modulation signal of the full responsibility cycle and the 20% duty cycle during the Nth and (N+1)th faces of the liquid crystal display 300. The average current is still 20mA, so the green, blue, and red two-color LEDs G, B, and R are pulse-width modulated by different duty cycles. After the movement, the brightness exhibited during the two-phase different planes of the liquid crystal display is also the same. Furthermore, although it is understood from the explanation of the above embodiment that the 'light-emitting diode 17 1363226 P070728BEZ1TW 26705twf.doc/n body backlight module driving device 305 is independent of the liquid crystal display 300, according to the spirit of the present invention, Limited to this. That is to say, the LED backlight module driving device 305 of the above embodiment is built in the timing controller 307 in another embodiment of the present invention, thereby achieving the same as the above embodiment. Technical efficiency. In this regard, those having ordinary knowledge in the field of the present invention should be able to implement the embodiment in which the LED backlight driving device 305 is built in the timing controller 307 according to the teachings of the above embodiments. It will not be repeated. In addition, 'because today's LED backlight modules are often equipped with white LEDs', but the wafer material of the white LEDs has a three-element semiconductor material and a small amount of phosphors ( Therefore, the LED backlight module driving device 305 of the present invention can still drive the LED backlight module configured with the white LED, so that the liquid crystal display to be applied to the polygon color gamut The purpose. Based on the disclosure of the above embodiments, a method for driving a backlight diode module will be incorporated below for those skilled in the relevant art to which the present invention pertains. FIG. 7 is a flow chart showing a driving method of a light-emitting diode backlight module according to an embodiment of the invention. Referring to FIG. 7, the driving method of the LED backlight module of the present embodiment includes the following steps: First, as described in step S7〇1, a first control signal and a second control signal are alternately provided according to a switching signal. . In the present embodiment, the switching signal is provided by a timing controller of the liquid crystal display. 1363226 P070728BEZ1TW 26705tWf.d〇c/n Next, as described in step S703, driving at least one first color in the LED backlight module according to the first control signal or the second control signal (for example The green LED is such that the first color (ie, green) light emitting diode can exhibit a first color (ie, green) of at least two different wavelengths. In this embodiment, the first control signal is a pulse width modulation signal having a plurality of different duty cycles, and the second control signal is a pulse width modulation signal of a full duty cycle. In addition, the driving method of the LED backlight module provided in this embodiment is not limited to driving only the green LED in the LED backlight module. More specifically, the driving method of the LED backlight module of the present invention can further drive at least one second of the LED backlight module according to the first control signal or the second control signal. A light-emitting diode of a color shirt (for example, blue), whereby the second color (ie, blue) light-emitting diode can exhibit a second color of at least two different wavelengths. Similarly, the driver of the LED backlight module provided by the present invention can also drive at least one third of the LED backlight modules according to the first control signal or the second control signal. A light-emitting diode of color (for example, red), whereby the light-emitting body of the third color (ie, red) can exhibit a third color (ie, red) of at least two different wavelengths. The red light-emitting diode backlight module driving device provided by the present invention is suitable for driving a general-purpose light-emitting diode backlight module, which is mainly used for green and blue light-emitting diodes. The material of the wafer is a three-element semiconductor material (the material property is blue-shifted by the piezoelectric effect), and the red illuminating-polar wafer is made of a four-element semiconductor material (the material property is: 19 1363226 P070728BEZ1TW 26705twf.doc/n) When it is hot, it will produce a red shift), so when the red, green and blue LEDs are driven by the pulse width modulation signals of different duty cycles during the different two sides, the three will be different in the two During the kneading process, red, green and blue colors of two different wavelengths are respectively generated, and then the color gamut which the human eye perceives is caused by the multi-deformation color gamut, that is, the gamut of at least the quadrilateral or more. . Therefore, the driving device and method for the LED backlight module provided by the present invention need to have other basic color LEDs in the current conventional LED backlight module, and only need to adopt Nowadays, the general light-emitting diode backlight module can make the color gamut of the liquid crystal display reach the polygonal color gamut, thereby improving the color change and image quality that the liquid crystal display can present. While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. n [Simple description of the diagram] Figure 1 shows the color gamut developed by the International Lighting Association (CIE) in 1931. Fig. 2 is a schematic view showing a quadrangular color gamut which is conventionally constructed using four basic colors. 3 is a block diagram of a system of a liquid crystal display according to an embodiment of the invention. 20 1363226 P070728BEZ1TW 26705twf.doc/n FIG. 4 is a block diagram showing a driving arrangement of a light-emitting diode backlight module according to an embodiment of the invention. FIG. 5 is a color gamut diagram of a liquid crystal display according to an embodiment of the invention. FIG. 6 is a timing diagram showing waveforms of the first control vanadium number and the second control signal provided by the driving device of the LED backlight module during the two-phase different planes of the liquid crystal display according to an embodiment of the invention. FIG. 7 is a flow chart of a method for driving a backlight of a light-emitting diode backlight module according to an embodiment of the invention. [Main component symbol description] A ' B ' B', B" : color gamut range · 300 : LCD 301 : LCD panel 303 : LED backlight module. 3〇5 : LED backlight module Drive device 307: timing controller % 3〇9: gate driver 311: source driver 401: control unit 403: drive unit SS: switching signals CS1, CS2: first, second control signals S701 to S703: one of the present invention Step 21 of the flow chart of the LED backlighting method driving method of the embodiment