201027494 ' 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種顯示裝置與其控制方法，特別是有關於 一種可降低標準化模糊邊界時間（Normalized Blurred Edge Time ; N-BET)的顯示裝置和控制方法。 【先前技術】 隨著液晶顯示器的普及化，液晶顯示器背光模組的品質與成 Φ 本越來越被重視。目前液晶顯示器背光模組主要是以冷陰極管或 是發光二極體當作背光源*然而不管是以冷陰極管或是發光二極 體當作背光源，在液晶顯示器撥放快速閃動的畫面時皆會有拖影 的現象。為了減少晝面拖影現象，習知技術係在相鄰兩光源間架 設隔板來阻擋光源間之光線互相影響，以純化光源的光線，但這 種做法不僅會造成螢幕上出現雲紋(Mura)，導致消費者看到明暗 分布不均勻的晝面，而且會增加成本。此外，背光模組係藉由控 制光源的開關順序，來減少光源間之光線互相影響，因此，在背 φ 光模組中，光源的開關順序係一相當重要的課題。 請參照第1圖，其係繪示習知背光模組之光源開關的時序示 意圖，其中光源12、光源14、光源16、光源18、光源20和光源 22係同時開啟和關閉，以避免相鄰光源互相影響。然而，在光源 20開啟後，其光源開啟訊號Se才到達，這種相位錯誤的情況會導 致螢幕上出現雙重邊界(Double Edge)的問題。同樣地，在光源22 開啟一陣子後，其光源開啟訊號Sf才到達，在光源22所負責之 區域亦會有雙重邊界的問題。 請參照第2圖，其係繪示又一習知背光模組之光源開關的時 4 201027494 序示意圖，其中光源12、光源14、光源16、光源18、光源20和 ' 光源22係被依序開啟，並以50%之責任週期（Duty Cycle)開始工 作。這種做法可以有效地解決由相位錯誤所造成之雙重邊界的問 題，但是相鄰光源之光線仍會互相地影響。對光源16而言，光源 14將光線發射進光源16所負責的區域中，導致光源16尚未開啟 時，光源16所負責之區域已有光源14所發射進來之光線，同樣 地，光源18將光線發射進光源16所負責的區域中，導致光源16 在關閉後，光源16所負責之區域依然存在有光源18所發射進來 的光線。 參 請參照第3圖，其係繪示再一習知背光模組之光源開關的時 序示意圖，其中光源12、光源14、光源16、光源18、光源20和 光源22之責任週期縮小為37%，雖然縮小責任週期後，可降低 N-BET值，但為了維持光源的效果，勢必要增加光源功率才能維 持原有的發光效果，因而造成使用效率低和光源溫度上升的問題。 【發明内容】 φ 因此，本發明的一方面就是在提供一種顯示裝置與其控制方 法，藉以縮小N-BET值並避免雙重邊界的現象。 根據本發明之一實施例，本發明之顯示裝置至少包含複數個 光源，本發明之背光模組的控制方法至少包括：設定此些光源之 一第一光源的責任週期（Duty Cycle)為第一責任週期值；設定此些 光源之一第二光源的責任週期為第二責任週期值，其中第二責任 週期值係不等同於第一責任週期值；以及以預設時間間隔與順序 " 依序控制此些光源，其中第二光源係於第一光源開啟一預設時間 • 後開啟，且第二光源係與第一光源同時關閉。 5 201027494 根據本發明之另一較佳實施例，本發明之背光模組至少包含 複數個光源，本發明之背光模組的控制方法至少包括：設定此些 光源光源之一第一光源的責任週期為第一責任週期值；設定此些 光源之一第二光源的責任週期為第二責任週期值，其中第二責任 週期值係不等同於第一責任週期值；以一預設時間間隔與順序依 序輸出複數個光源開啟訊號，來開啟此些光源，其中每一此些光 源之第一光源和第二光源係同時開啟；以及依序關閉此些光源， 其中第二光源係於第一光源關閉一預設時間後關閉。 根據本發明之再一較佳實施例，本發明之顯示裝置至少包含 一液晶面板，用以顯示影像資料；以及一背光模組，用以提供液 晶面板顯示影像資料所需的光線，並至少包含複數個光源，此些 光源包括：一第一光源，係根據一第一責任週期操作開啟與關 閉；以及一第二光源，係根據一第二責任週期操作開啟與關閉， 其中第二責任週期係不等同於第一責任週期；其中，第一光源與 第二光源以一預設時間間隔與順序依序開啟與關閉，第二光源係 於第一光源開啟一預設時間後開啟，且第二光源係與第一光源同 時關閉。 根據本發明之又一實施例，本發明之顯示裝置至少包含一液 晶面板，用以顯示影像資料；以及一背光模組，用以提供液晶面 板顯示影像資料所需的光線，並至少包含複數個光源，此些光源 包括：一第一光源，係根據一第一責任週期操作開啟與關閉；以 及一第二光源，係根據一第二責任週期操作開啟與關閉，其中第 二責任週期係不等同於第一責任週期；其中，第一光源與第二光 源以一預設時間間隔與順序依序開啟與關閉，第一光源和第二光 源係同時開啟，且第二光源係於第一光源關閉一預設時間後關閉。 6 201027494 【實施方式】 請參照第4圖，其係繪示根據本發明之第一實施例之背光模 組之光源開關的時序示意圖’其中此背光模組具有複數個光源 222、224、226、和228 ; Sa為光源222之光源開啟訊號，當sa 被輸入至光源222時，光源222會在一段非常小的延遲時間後開 始工作，這段延遲時間通常為液晶的反應時間，但也可做為光源 開啟訊號與燈管開啟時間的緩衝。同樣地，Sb為光源224之光源 開啟訊號，Sc為光源226之光源開啟訊號；Sd為光源228之光源 開啟訊號，其中相鄰燈管之光源開啟訊號均有時間差，此時間差 為本實施例預設之時間間隔230。首先，以預設時間間隔23〇，依 序開啟這些光源’使光源222以第一責任週期a%開始工作，以下 簡稱第一責任週期為A%，光源224以第二責任週期b%開始工 作’以下簡稱第二責任週期為B%，光源226以A%開始工作，光 源228以B%開始工作，其中B%小於A%。對光源222而言，光 源224與光源222同時關閉，可避免光源222所負責之區域在光 ^ 源222關閉後仍然存在有光源224所發射之光線β對光源226而 言，光源226與光源224同時開啟，可避免光源226所負責之區 域在光源226開啟前存在有光源224所發射之光線，另外，光源 2之8與光源226同時關閉，可避免光源226所負責之區域在光源 226關閉後仍然存在有光源228所發射之光線。由於光源224和光 源228具有較短之責任週期Β%，所以光源224和光源228之發光 功率大於光源222和光源226之發光功率，以使本發明較佳實施 .例之背光模組具有均勻的亮度。上述之光源可例如為冷陰極燈管 ' 或是LED。本實施例之光源數目並不受限，而且經由實驗證明， 7 201027494 A%與B%之關係式可為：B%=A%-(l/L+l)x2，其中L為光源總數 • 舉例而言，若本實施例之背光模組包含有3個光源，即L為3 且設定A%為60%，則可由上列關係式得到B°/。為10% °201027494 '6. Description of the Invention: [Technical Field] The present invention relates to a display device and a control method thereof, and more particularly to a display device capable of reducing normalized Blurred Edge Time (N-BET) And control methods. [Prior Art] With the popularization of liquid crystal displays, the quality and efficiency of liquid crystal display backlight modules have been paid more and more attention. At present, the liquid crystal display backlight module mainly uses a cold cathode tube or a light-emitting diode as a backlight. However, whether it is a cold cathode tube or a light-emitting diode as a backlight, the liquid crystal display is quickly flashed. There will be smear in the picture. In order to reduce the smear phenomenon, the conventional technique is to erect a partition between two adjacent light sources to block the light between the light sources to purify the light of the light source, but this method not only causes moiré on the screen (Mura) ), causing consumers to see uneven distribution of light and dark, and will increase costs. In addition, the backlight module reduces the mutual influence of light between the light sources by controlling the switching sequence of the light source. Therefore, in the back φ optical module, the switching sequence of the light source is a very important subject. Please refer to FIG. 1 , which is a timing diagram of a light source switch of a conventional backlight module, in which a light source 12 , a light source 14 , a light source 16 , a light source 18 , a light source 20 , and a light source 22 are simultaneously turned on and off to avoid adjacent Light sources affect each other. However, after the light source 20 is turned on, its light source turn-on signal Se arrives, and this phase error may cause a double edge problem on the screen. Similarly, after the light source 22 is turned on for a while, the light source turn-on signal Sf arrives, and there is a double boundary problem in the area in which the light source 22 is responsible. Please refer to FIG. 2 , which is a schematic diagram of a light source switch of another conventional backlight module. The light source 12 , the light source 14 , the light source 16 , the light source 18 , the light source 20 , and the “light source 22 are sequentially arranged . Turn it on and start working with a duty cycle of 50% (Duty Cycle). This approach can effectively solve the problem of double boundaries caused by phase errors, but the light from adjacent sources will still affect each other. For the light source 16, the light source 14 emits light into the area in which the light source 16 is responsible, so that when the light source 16 is not turned on, the light source 16 is responsible for the light that the light source 14 emits. Similarly, the light source 18 emits light. The light is emitted into the area in which the light source 16 is responsible, such that after the light source 16 is turned off, the light source 16 is still in the area where the light source 16 is responsible for the light emitted by the light source 18. Referring to FIG. 3, it is a timing diagram of a light source switch of a conventional backlight module, wherein the duty cycle of the light source 12, the light source 14, the light source 16, the light source 18, the light source 20, and the light source 22 is reduced to 37%. Although the N-BET value can be lowered after the duty cycle is shortened, in order to maintain the effect of the light source, it is necessary to increase the power of the light source to maintain the original light-emitting effect, thereby causing a problem of low use efficiency and an increase in temperature of the light source. SUMMARY OF THE INVENTION Accordingly, an aspect of the present invention is to provide a display device and a control method thereof, whereby a N-BET value is reduced and a double boundary is avoided. According to an embodiment of the present invention, the display device of the present invention includes at least a plurality of light sources. The control method of the backlight module of the present invention at least includes setting a duty cycle (Duty Cycle) of the first light source of the light sources to be the first a duty cycle value; setting a duty cycle of the second light source of one of the light sources as a second duty cycle value, wherein the second duty cycle value is not equal to the first duty cycle value; and the preset time interval and the order" The light sources are sequentially controlled, wherein the second light source is turned on after the first light source is turned on for a preset time, and the second light source is turned off simultaneously with the first light source. According to another embodiment of the present invention, the backlight module of the present invention includes at least a plurality of light sources. The control method of the backlight module of the present invention at least includes: setting a duty cycle of the first light source of one of the light source sources a first duty cycle value; setting a duty cycle of the second light source of the one of the light sources as a second duty cycle value, wherein the second duty cycle value is not equal to the first duty cycle value; at a predetermined time interval and sequence And sequentially outputting a plurality of light source turn-on signals to turn on the light sources, wherein the first light source and the second light source of each of the light sources are simultaneously turned on; and sequentially turning off the light sources, wherein the second light source is tied to the first light source Close after a preset time has elapsed. According to still another preferred embodiment of the present invention, the display device of the present invention includes at least one liquid crystal panel for displaying image data, and a backlight module for providing light required for the liquid crystal panel to display image data, and includes at least a plurality of light sources, the light source comprising: a first light source that is turned on and off according to a first duty cycle; and a second light source that is turned on and off according to a second duty cycle operation, wherein the second duty cycle is Not corresponding to the first duty cycle; wherein, the first light source and the second light source are sequentially turned on and off at a predetermined time interval and sequentially, and the second light source is turned on after the first light source is turned on for a preset time, and the second The light source is turned off simultaneously with the first light source. According to still another embodiment of the present invention, the display device of the present invention includes at least one liquid crystal panel for displaying image data, and a backlight module for providing light required for the liquid crystal panel to display image data, and includes at least a plurality of a light source, the light source includes: a first light source that is turned on and off according to a first duty cycle; and a second light source that is turned on and off according to a second duty cycle, wherein the second duty cycle is not equal The first light source and the second light source are sequentially turned on and off at a predetermined time interval and sequentially, the first light source and the second light source are simultaneously turned on, and the second light source is turned off at the first light source. Close after a preset time. [2010] [Embodiment] Please refer to FIG. 4, which is a timing diagram of a light source switch of a backlight module according to a first embodiment of the present invention. The backlight module has a plurality of light sources 222, 224, 226, And 228; Sa is the light source of the light source 222. When sa is input to the light source 222, the light source 222 starts to work after a very small delay time. The delay time is usually the reaction time of the liquid crystal, but it can also be done. A buffer for the light source to turn on the signal and the lamp on time. Similarly, Sb is the light source of the light source 224, and Sc is the light source of the light source 226; Sd is the light source of the light source 228, wherein the light source of the adjacent light has a time difference, and the time difference is Set the time interval 230. First, the light sources 222 are sequentially turned on at a predetermined time interval of 23 ' to cause the light source 222 to start operating at the first duty cycle a%. Hereinafter, the first duty cycle is A%, and the light source 224 starts operating at the second duty cycle b%. 'The second duty cycle is hereinafter referred to as B%, the light source 226 starts operating at A%, and the light source 228 starts operating at B%, where B% is less than A%. For the light source 222, the light source 224 and the light source 222 are simultaneously turned off, so that the area of the light source 222 is prevented from being still present by the light source 224 after the light source 222 is turned off. For the light source 226, the light source 226 and the light source 224 Simultaneously turning on, the light source 226 is prevented from having the light emitted by the light source 224 before the light source 226 is turned on. In addition, the light source 2 and the light source 226 are simultaneously turned off, so that the area where the light source 226 is responsible can be avoided after the light source 226 is turned off. There is still light emitted by the light source 228. Since the light source 224 and the light source 228 have a shorter duty cycle Β%, the illuminating power of the light source 224 and the light source 228 is greater than the illuminating power of the light source 222 and the light source 226, so that the backlight module of the preferred embodiment of the present invention has uniformity. brightness. The light source described above can be, for example, a cold cathode fluorescent tube 'or an LED. The number of light sources in this embodiment is not limited, and it has been experimentally proved that 7 201027494 A% and B% can be: B%=A%-(l/L+l)x2, where L is the total number of light sources. For example, if the backlight module of the embodiment includes three light sources, that is, L is 3 and the setting A% is 60%, B°/ can be obtained from the above relationship. 10% °
由上述之說明可知，本發明之第一實施例係藉由將光源分為 兩個具有不同責任週期之光源組來避免相鄰光源的互相干擾。在 本發明之第一實施例中，光源222和光源224被設為光源組232 ; 光源226和光源228被設為光源組234,並調整每一光源組之第二 者(例如光源224、228)之責任週期和開關時間’以使每一光源組 之第二者於每一光源組之第一者（例如光源222、226)開啟後’經 過一段預設開啟時間235後才開啟’並與每一光源組之第一者同 時關閉。第一實施例所獲得之整體N-BET值比起以縮小之責任週 期工作之習知背光模組還低，而且也不會出現雲紋在螢幕上。 請參照第5圖，其係繪示根據本發明之第二實施例之背光模 組之光源開關的時序示意圖，類似於第4圖，其中Sa為光源222 之光源開啟訊號，當Sa被輸出至光源222時，光源222會在一段 非常小的延遲時間後開始工作。同樣地，Sb為光源224之光源 開啟訊號；Sc為光源226之光源開啟訊號；Sd為光源228之光源 開啟訊號。首先，以預設時間間隔230，依序開啟這些光源，使光 源222以A%(例如20%)開始工作，光源224以B%(例如60%)開 始工作，光源226以A%開始工作，光源228以B%開始工作，其 中B%大於A%。對光源224而言，光源222與光源224同時開啟， 可避免光源224所負責之區域在光源224開啟前存在有光源222 所發射之光線，另外，光源226與光源224同時關閉，可避免光 源224所負責之區域在光源224關閉後存在有光源226所發射之 光線。同樣地，對光源228而言，光源226與光源228同時開啟， 201027494 可避免光源228所負責之區域在光源228開啟前存在有光源226 • 所發射之光線。由於光源222和光源226具有較短之責任週期 A%，所以光源222和光源226之發光功率大於光源224和光源228 之發光功率，以使本發明另一較佳實施例之背光模組具有均勻的 亮度。經由實驗證明，本實施例之A%與B%之關係式可為：A°/〇 = B%-(l/L+l)x2，其中L為光源總數。舉例而言，若本實施例之背 光模組包含有3個光源，即L為3，且設定A%為10% ’則B%為 60%。 由上述之說明可知，本發明之第二實施例係將光源分為兩個 φ 具有不同責任週期之光源組來避免相鄰光源的互相干擾。在第二 實施例中，光源222和光源224被設為光源組236;光源226和光 源228被設為另一光源組237，藉由調整每一光源組之第一者(例 如光源222、226)之責任週期和開關時間，以使每一光源組之第一 者與每一光源組之第二者同時開啟(例如光源224、228)，並於每 一光源組之第二者關閉前一段預設關閉時間238前就關閉，因此， 在第二實施例中，亦可將光源組236和光源組237視為以另一預 設時間間隔239依序開啟。本實施例所獲得之整體n-BET值比起 ® 以縮小之責任週期工作之習知背光模組還低，而且也不會出現雲 紋在螢幕上。 請參照第6圖’其係繪示根據本發明之第三實施例之背光模 組之光源開關的時序示意圖，在第五實施例中，增加光源24〇、 242、244和246 ’以使熟悉此技藝之人士更容易了解本實施例。 首先’依序開啟這些光源，使光源222以A%開始工作，光源224 - 以A%開始工作’光源226以B%開始工作，光源228以B%開始 、 工作’光源240以A%開始工作，光源242以A%開始工作，光源 201027494 244以B°/〇開始工作，光源246以B%開始工作，其中B%小於A%。 對光源222和光源224而言，光源222和光源224同時開啟和關 閉，可避免光源222和光源224互相影響，同樣地，對光源226 和光源228而言，226和光源228同時開啟和關閉，可避免光源 226和光源228互相影響；對光源240和光源242而言，光源240 和光源242同時開啟和關閉，可避免光源240和光源242互相影 響；對光源244和光源246而言，光源244和光源246同時開啟 和關閉，可避免光源244和光源246互相影響。另外，對光源224 而言，光源226與光源224同時關閉，可避免光源224所負責之 區域在光源224關閉後存在有光源226所發射之光線；對光源240 而言，光源228在光源240開啟時關閉，可避免雙重邊界現象的 發生；對光源242而言，光源244與光源242 —起關閉，可避免 光源242所負責之區域在光源242關閉後存在有光源244所發射 之光線。由於光源226、光源228、光源244和光源246具有較短 之責任週期B%，所以光源226、光源228、光源244和光源246 之發光功率大於光源222、光源224、光源240和光源242之發光 功率，以使本發明第三實施例之背光模組具有均勻的亮度。 由上述之說明可知，第三實施例係依時序先後和一第一預設 數量將光源分為兩個光源組，其中此第一預設數量為偶數，且第 三實施例更進一步地將位於同一光源組之光源等分為具有不同責 任週期之兩個次光源組。在第三實施例中，光源222、光源224、 光源226和光源228被設為光源組248 ;光源240、光源242、光 源244、光源246被設為另一光源組250,其中光源222和光源224 更被設定為次光源組252;光源226和光源228被設定為次光源組 254 :光源240和光源242被設定為次光源組256 ;光源244和光 201027494 源246被設定為次光源組258，次光源組252於上一光源組關閉後 . 開啟，以避免雙重邊界現象的發生，次光源組254與次光源組252 同時關閉，以避免次光源252組所負責之區域在次光源組252關 閉後存在有次光源組254之光線。本實施例利用具有不同責任週 期之次光源組來縮小光源組之N_BET值，以更進一步地縮小本實 施例所獲得之N-BET值。 第三實施例之背光模組所使用之光源可以例如為冷陰極燈管 或是LED。本實施例之光源數目並不受限，而且經由實驗證明， A%與Β0/ό之關係式可為：B%=A%-(1/L+1)x2，其中L為次光源組 總數。舉例而言’右第二實施例之旁光模組包含有14個光源，設 定A%為50%並將14個光源兩兩分為7光源組，則可知£為7， 並得出B%為25%。 請參照第7圖’其係繪不根據本發明之第四實施例之用於背 光模組之控制方法之光源開關的時序示意圖。首先，依序開啟這 些光源，使光源222以A%開始工作，光源224以A%開始工作， 光源226以B°/〇開始工作’光源228以B%開始工作，光源240以 φ A%開始工作，光源242以A%開始工作，光源244以B❶/❶開始工 作’光源246以開始工作’其中b%係大於A%。對光源222 和光源224而言，光源222和光源224同時開啟和關閉，可避免 光源222和光源224互相影響。類似地，對光源226和光源228 而言，光源226和光源228同時開啟和關閉，可避免光源226和 光源228互相影響；對光源240和光源242而言，光源240和光 源242同時開啟和關閉，可避免光源240和光源242互相影響； ，對光源244和光源240而言，光源244和光源246同時開啟和關 '閉，可避免光源244和光源246互相影響。另外，對光源226而 201027494 言’光源224與光源226同時開啟，可避免光源226所負責之區 域在光源226開啟前存在有光源224所發射之光線；對光源24〇 而言，光源240在光源228關閉後才開啟，以避免雙重邊界現象 的發生，對光源244而言，光源242與光源244同時開啟，可避 免光源244所負責之區域在光源244開啟前存在有光源242所發 射之光線。由於光源222、光源224、光源240和光源242具有較 短之責任週期A%，所以光源222、光源224、光源240和光源242 之發光功率大於光源226、光源228、光源244和光源246之發光 功率，以使本發明又一較佳實施例之背光模組具有均勻的亮度。 9- 由上述之說明可知，本發明之第四實施例係依時序先後和一 第一預設數量將光源分為兩個光源組，其中此第一預設數量為偶 數’且第四實施例更進一步地將位於同一光源組之光源等分為具 有不同責任週期之兩個次光源組。在第四實施例中，光源222、光 源224、光源226和光源228被設為光源組260 ;光源240、光源 232、光源242、光源246被設為另一光源組262，其中光源222 和光源224更被設定為次光源組264;光源226和光源228被設定 為次光源組266 :光源240和光源242被設定為次光源組268 ;光 ® 源244和光源246被設定為次光源組268,次光源組264於上一光 源組260關閉後開啟，以避免雙重邊界現象的發生。本實施例利 用具有不同責任週期之次光源組來縮小光源組之N-BET值，以更 進一步地縮小本實施例所獲得之N-BET值》 第四實施例之背光模組所使用之光源可以例如為冷陰極燈管 或是LED。本實施例之光源數目並不受限，而且經由實驗證明’ - A%與B%之關係式可為：A% = B%-(l/L+l)x2,其中L為次光源組 總數》舉例而言，若第四實施例，之背光模組包含有14個光源， 12 201027494 設定A°/〇為25%並將14個光源兩兩分為7個次光源組，則可知L • 為7，並得出B%為50%。 請參照第八圖，其係繪示根據本發明之第五實施例之顯示裝 置500的爆炸結構示意圖。顯示裝置500至少包含液晶面板510 和背光模組520,其中液晶面板510係用以顯示影像資料，而背光 模組520係用以提供液晶面板510顯示資料所需的光線。背光模 組520至少包含複數個光源522、524、526和528，而這些光源係 根據本發明上述之實施例所提供的時序来工作，以避免顯示裝置 500的晝面出現雲紋或拖影的現象。 參 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 可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請 專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、和優點能更明顯易 φ 懂，上文特舉較佳實施例，並配合所附圖式，作詳細說明如下： 第1圖係繪示習知背光模組之光源開關的時序示意圖。 第2圖係繪示又一習知背光模組之光源開關的時序示意 圖。 第3圖係繪示再一習知背光模組之光源開關的時序示意 圖。 第4圖係繪示根據本發明之第一實施例之背光模組之光源 開關的時序示意圖。 第5圖係繪示根據本發明之第二實施例之背光模組之光源 13 201027494 開關的時序示意圖。 第6圖係繪示根據本發明之第三較佳實施例之背光模組之 光源開關的時序示意圖。 第7圖係繪示根據本發明之第四實施例之背光模組之光源 開關的時序不意圖。 第8圖係繪示根據本發明之第五實施例之顯示裝置的爆炸 結構示意圖。 ❹ 【主要元件符號說明】 12 :光源 14 :光源 16 :光源 18 :光源 20 ;光源 22 :光源 222 :光源 224 :光源 226 :光源 228 :光源 230 :預設時間間隔 232 :光源組 234 :光源組 235 :預設開啟時間 236 :光源組 237 :光源組 238 :預設關閉時間 239 :預設時間間隔 240 :光源 242 :光源 244 :光源 246 :光源 248 :光源組 250 :光源組 252 :次光源組 254 :次光源組 256 :次光源組 258 :次光源組 14 201027494 260 :光源組 * 264:次光源組 268 :次光源組 262 :光源組 266 :次光源組 270 :次光源組As apparent from the above description, the first embodiment of the present invention avoids mutual interference of adjacent light sources by dividing the light source into two light source groups having different duty cycles. In the first embodiment of the present invention, the light source 222 and the light source 224 are set as the light source group 232; the light source 226 and the light source 228 are set as the light source group 234, and the second one of each light source group is adjusted (for example, the light source 224, 228) The duty cycle and switching time 'to enable the second of each source group to be turned on after the first one of each of the light source groups (eg, light sources 222, 226) is turned on - after a predetermined on time 235 is turned on' and The first of each source group is turned off at the same time. The overall N-BET value obtained in the first embodiment is lower than that of the conventional backlight module which works in a reduced duty cycle, and no moiré appears on the screen. Please refer to FIG. 5 , which is a timing diagram of a light source switch of a backlight module according to a second embodiment of the present invention. Similar to FIG. 4 , where Sa is the light source of the light source 222, when Sa is output to At source 222, source 222 will begin to operate after a very small delay time. Similarly, Sb is the light source of the light source 224; the light is the light source of the light source 226; and Sd is the light source of the light source 228. First, the light sources are sequentially turned on at a preset time interval 230, so that the light source 222 starts operating at A% (for example, 20%), the light source 224 starts operating at B% (for example, 60%), and the light source 226 starts operating at A%. Light source 228 begins to operate at B%, where B% is greater than A%. For the light source 224, the light source 222 and the light source 224 are simultaneously turned on, so that the light source 224 is prevented from being exposed by the light source 222 before the light source 224 is turned on. In addition, the light source 226 and the light source 224 are simultaneously turned off to avoid the light source 224. The area in charge is the light emitted by the source 226 after the light source 224 is turned off. Similarly, for source 228, source 226 is turned on simultaneously with source 228, and 201027494 prevents the area of light source 228 from being exposed to light emitted by source 226 before source 228 is turned on. Since the light source 222 and the light source 226 have a shorter duty cycle A%, the light-emitting power of the light source 222 and the light source 226 is greater than the light-emitting power of the light source 224 and the light source 228, so that the backlight module of another preferred embodiment of the present invention has uniformity. Brightness. It has been experimentally proved that the relationship between A% and B% of the present embodiment can be: A°/〇 = B%-(l/L+l)x2, where L is the total number of light sources. For example, if the backlight module of the embodiment includes three light sources, that is, L is 3, and the setting A% is 10%', then B% is 60%. As can be seen from the above description, the second embodiment of the present invention divides the light source into two φ light source groups having different duty cycles to avoid mutual interference of adjacent light sources. In the second embodiment, the light source 222 and the light source 224 are set as the light source group 236; the light source 226 and the light source 228 are set as another light source group 237 by adjusting the first one of each light source group (for example, the light source 222, 226) a duty cycle and a switching time such that the first one of each light source group is turned on simultaneously with the second one of each light source group (eg, light sources 224, 228) and is turned off before the second one of each light source group is turned off The preset off time 238 is turned off before. Therefore, in the second embodiment, the light source group 236 and the light source group 237 can also be regarded as being sequentially turned on at another predetermined time interval 239. The overall n-BET value obtained in this embodiment is lower than that of the conventional backlight module which operates from a reduced duty cycle, and there is no cloud on the screen. Please refer to FIG. 6 , which is a timing diagram of a light source switch of a backlight module according to a third embodiment of the present invention. In the fifth embodiment, the light sources 24 〇 , 242 , 244 , and 246 ′ are added to familiarize themselves with each other. This embodiment is easier for those skilled in the art to understand this embodiment. First, these light sources are turned on sequentially, so that the light source 222 starts working at A%, and the light source 224 starts working at A%. The light source 226 starts to work at B%, and the light source 228 starts at B%, and the light source 240 starts working at A%. The light source 242 starts operating at A%, the light source 201027494 244 starts operating at B°/〇, and the light source 246 starts operating at B%, where B% is less than A%. For the light source 222 and the light source 224, the light source 222 and the light source 224 are simultaneously turned on and off to prevent the light source 222 and the light source 224 from interacting with each other. Similarly, for the light source 226 and the light source 228, the 226 and the light source 228 are simultaneously turned on and off. The light source 226 and the light source 228 can be prevented from interacting with each other; for the light source 240 and the light source 242, the light source 240 and the light source 242 are simultaneously turned on and off to prevent the light source 240 and the light source 242 from interacting with each other; for the light source 244 and the light source 246, the light source 244 Simultaneously turning on and off with the light source 246 prevents the light source 244 and the light source 246 from interacting with each other. In addition, for the light source 224, the light source 226 and the light source 224 are simultaneously turned off, so that the light source 224 is prevented from having the light emitted by the light source 226 after the light source 224 is turned off; for the light source 240, the light source 228 is turned on at the light source 240. When the time is off, the double boundary phenomenon can be avoided; for the light source 242, the light source 244 is turned off together with the light source 242 to prevent the light source 242 from being exposed to the light emitted by the light source 244 after the light source 242 is turned off. Since the light source 226, the light source 228, the light source 244, and the light source 246 have a shorter duty cycle B%, the illumination power of the light source 226, the light source 228, the light source 244, and the light source 246 is greater than that of the light source 222, the light source 224, the light source 240, and the light source 242. The power is such that the backlight module of the third embodiment of the present invention has uniform brightness. As can be seen from the above description, the third embodiment divides the light source into two light source groups according to the time sequence and a first preset number, wherein the first preset number is an even number, and the third embodiment will be further located. The light sources of the same light source group are equally divided into two secondary light source groups having different duty cycles. In the third embodiment, the light source 222, the light source 224, the light source 226, and the light source 228 are set as the light source group 248; the light source 240, the light source 242, the light source 244, and the light source 246 are set as another light source group 250, wherein the light source 222 and the light source 224 is further set as the secondary light source group 252; the light source 226 and the light source 228 are set as the secondary light source group 254: the light source 240 and the light source 242 are set as the secondary light source group 256; the light source 244 and the light 201027494 source 246 are set as the secondary light source group 258, The secondary light source group 252 is turned on after the previous light source group is turned off to avoid the occurrence of a double boundary phenomenon, and the secondary light source group 254 and the secondary light source group 252 are simultaneously turned off to prevent the region in which the secondary light source 252 is responsible for being turned off in the secondary light source group 252. Light rays from the secondary source group 254 are then present. This embodiment uses the secondary light source group having different duty cycles to narrow the N_BET value of the light source group to further narrow the N-BET value obtained in the present embodiment. The light source used in the backlight module of the third embodiment may be, for example, a cold cathode fluorescent tube or an LED. The number of light sources in this embodiment is not limited, and it has been experimentally proved that the relationship between A% and Β0/ό can be: B%=A%-(1/L+1)x2, where L is the total number of secondary light source groups. . For example, the right-side second embodiment of the bypass module includes 14 light sources, setting A% to 50% and dividing the 14 light sources into 7 light source groups, then it is known that the value is 7 and B% is obtained. It is 25%. Referring to Fig. 7, a timing diagram of a light source switch for a control method of a backlight module according to a fourth embodiment of the present invention is shown. First, the light sources are turned on sequentially, so that the light source 222 starts to work at A%, the light source 224 starts to work at A%, and the light source 226 starts to work at B°/〇. The light source 228 starts operating at B%, and the light source 240 starts at φ A%. Working, light source 242 starts operating at A%, and light source 244 starts operating at B❶/❶ 'light source 246 to start working' where b% is greater than A%. For the light source 222 and the light source 224, the light source 222 and the light source 224 are simultaneously turned on and off to prevent the light source 222 and the light source 224 from interacting with each other. Similarly, for the light source 226 and the light source 228, the light source 226 and the light source 228 are simultaneously turned on and off to prevent the light source 226 and the light source 228 from interacting with each other; for the light source 240 and the light source 242, the light source 240 and the light source 242 are simultaneously turned on and off. The light source 240 and the light source 242 can be prevented from interacting with each other. For the light source 244 and the light source 240, the light source 244 and the light source 246 are simultaneously turned on and off to prevent the light source 244 and the light source 246 from interacting with each other. In addition, for the light source 226 and 201027494, the light source 224 and the light source 226 are simultaneously turned on to prevent the light source 226 from being responsible for the light emitted by the light source 224 before the light source 226 is turned on; for the light source 24, the light source 240 is at the light source. After the 228 is turned off, it is turned on to avoid the double boundary phenomenon. For the light source 244, the light source 242 and the light source 244 are simultaneously turned on, so that the light source 244 is prevented from being exposed by the light source 242 before the light source 244 is turned on. Since the light source 222, the light source 224, the light source 240, and the light source 242 have a shorter duty cycle A%, the illumination power of the light source 222, the light source 224, the light source 240, and the light source 242 is greater than that of the light source 226, the light source 228, the light source 244, and the light source 246. The power is such that the backlight module of another preferred embodiment of the present invention has uniform brightness. 9- From the above description, the fourth embodiment of the present invention divides the light source into two light source groups according to the time sequence and a first preset number, wherein the first preset number is an even number and the fourth embodiment Further, the light sources located in the same light source group are equally divided into two secondary light source groups having different duty cycles. In the fourth embodiment, the light source 222, the light source 224, the light source 226, and the light source 228 are set as the light source group 260; the light source 240, the light source 232, the light source 242, and the light source 246 are set as another light source group 262, wherein the light source 222 and the light source 224 is further set as the secondary light source group 264; the light source 226 and the light source 228 are set as the secondary light source group 266: the light source 240 and the light source 242 are set as the secondary light source group 268; the light source 244 and the light source 246 are set as the secondary light source group 268 The secondary light source group 264 is turned on after the previous light source group 260 is turned off to avoid the occurrence of a double boundary phenomenon. In this embodiment, the N-BET value of the light source group is reduced by using the secondary light source group having different duty cycles to further reduce the N-BET value obtained in the embodiment. The light source used in the backlight module of the fourth embodiment It can for example be a cold cathode lamp or an LED. The number of light sources in this embodiment is not limited, and it has been experimentally proved that the relationship between '-A% and B% can be: A% = B%-(l/L+l)x2, where L is the total number of secondary light source groups. For example, if the backlight module of the fourth embodiment includes 14 light sources, 12 201027494 sets A°/〇 to 25% and divides 14 light sources into 7 secondary light source groups, it is known that L • It is 7, and the B% is 50%. Referring to the eighth drawing, there is shown a schematic exploded view of a display device 500 according to a fifth embodiment of the present invention. The display device 500 includes at least a liquid crystal panel 510 for displaying image data, and a backlight module 520 for providing light required for the liquid crystal panel 510 to display data. The backlight module 520 includes at least a plurality of light sources 522, 524, 526, and 528, and the light sources operate according to the timing provided by the above embodiments of the present invention to avoid moiré or smear on the surface of the display device 500. phenomenon. Although the present invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more apparent and appreciated. The figure shows a timing diagram of a light source switch of a conventional backlight module. Figure 2 is a timing diagram showing the light source switch of another conventional backlight module. Fig. 3 is a timing chart showing the light source switch of another conventional backlight module. Fig. 4 is a timing chart showing the light source switch of the backlight module according to the first embodiment of the present invention. Figure 5 is a timing chart showing the light source 13 201027494 of the backlight module according to the second embodiment of the present invention. Figure 6 is a timing chart showing the light source switch of the backlight module according to the third preferred embodiment of the present invention. Fig. 7 is a timing diagram showing the timing of the light source switch of the backlight module according to the fourth embodiment of the present invention. Fig. 8 is a view showing the exploded structure of the display device according to the fifth embodiment of the present invention. ❹ [Main component symbol description] 12: Light source 14: Light source 16: Light source 18: Light source 20; Light source 22: Light source 222: Light source 224: Light source 226: Light source 228: Light source 230: Preset time interval 232: Light source group 234: Light source Group 235: preset on time 236: light source group 237: light source group 238: preset off time 239: preset time interval 240: light source 242: light source 244: light source 246: light source 248: light source group 250: light source group 252: times Light source group 254: secondary light source group 256: secondary light source group 258: secondary light source group 14 201027494 260: light source group * 264: secondary light source group 268: secondary light source group 262: light source group 266: secondary light source group 270: secondary light source group
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