1272562 九、發明說明： 【發明所屬之技術領域】 本發明係關於以多個發光二極體為光源的直照式背光模 組，尤其是有關於控制直照式背光模組的各列發光二極體的 方法。 【先前技術】 目前大尺寸的液晶顯示器（liquid crystal display，LCD ) 或液晶電視（LCD TV )背光模組（backlight module )多採冷 陰極營光管（cold cathode fluorescent lamp，CCFL )或發光二 極體（light emitting diode，LED)為光源的直照方式。由於 CCFL燈管内部使用水銀汞蒸氣，在生產製造與後續回收處理 均有環保的問題，再加上LED技術日臻完善，其演色性、開 關速度、發光效率與成本均較CCFL燈管更具優勢，而其色 彩、亮度控制也極為彈性、容易，因此LED已逐漸取代CCFL 燈管成為背光模組主要的發光元件。第7圖所示即為_種習 知的、以LED為光源的直照式背光模組的示意圖。如圖所示， 多個LED以矩陣式的排列、設置於一反射面板前。這此led 可以是白光LED、或是由紅、綠、藍色光的LED所適當組成。 在LED前方設置有散射片（diffusion sheet)、聚光片（㈣sm sheet)以提供均勻化與加強亮度的效果。 眾所周知的，因為液晶分子的延遲特性，LCD是屬於持 續型的顯示器，和屬於脈衝型的陰極射線管顯示器相比，lcd 1272562 的動怨影響品質一直是較遜一籌的，這也是學界與業界一直 持續不斷的研發重點，也因此有各種改善lcd反應速度的技 術被公開揭露出來。在過去，背光模組的重點都一直是著重 於如何提升背光模組所提供的面光的均勻度與亮度。自.從以 LED為光源的直照式背光模組逐漸成為主流後，因為LED的 反應速度可以極快、控制可以非常彈性，因此除了面光的均 勻度與凴度之外，也可以利用背光裝置LED的快速明滅來改 善LCD的動態影像品質。 【發明内容】 因此，本發明的主要特點在於，在LCD垂直同步訊號所 疋義的一個晝面時間裡，控制背光模組的各列lED的明滅， 以將因為液晶的物理延遲特性（反應速度低）而本質上屬於 持績型的LCD，使其達到類似陰極射線管的脈衝型顯示器的 效果，並同減低LCD的模糊、與閃爍等缺點。本發明所提 出的方法係實施於以多個發光二極體為光源的直照式背光模 組的一個驅動控制器内。 本發明所提出的方法可大分為二類，—類是對背光裝置 的水平排列的各列LED，搭配LCD的掃瞄，在一個畫面時間 裡k上到下逐列的表現出某種明暗特性，而達到一種類似掃 瞒的效果。此類方法尚可進_步對各列㈣搭配逐漸點亮、 延遲點亮、步進式的點亮或變暗等方式來配合液晶反應速度 1272562 慢的問題、或是改善模糊的缺點。另一類的方法則是對各列 LED同步施予相同的控制訊號，換言之，此類方法係達到一 種閃光（flash )、而非掃瞄的效果。這兩類方法都可以藉由調 整其控制訊號的工作週期大小來達到控制背光模組亮度的效 果。 茲配合所附圖示、實施例之詳細說明及申請專利範圍， 將上述及本發明之其他目的與優點詳述於後。然而，當可了 φ 解所附圖示純係為解說本發明之精神而設，不當視為本發明 範疇之定義。有關本發明範疇之定義，請參照所附之申請專 利範圍。 【實施方式】 本發明所提出的方法係實施於以多個發光二極體（LED) 為光源的直照式（direct-lit)背光模組（backlight module)的 一個驅動控制器（driver controller)内。請注意到，此直照 • 式背光模組係適用於液晶顯示器（LCD)、電漿（plasma)顯 示器、以及有機發光顯示器（organic light emitting display, • 〇LED)的背光模組。以下為簡化說明，主要以LCD為例解 /釋本發明的精神與運作原理。 實施本發明的驅動控制器係以一適當的連結方式連接並 控制此直照式背光模組的多個驅動器（driver)，而此直照式 背光模組的多個LED則分由這些驅動器所推動（亦即控制其 7 1272562 序控制訊號來控制各個驅動器。同樣的，本發明並不限驅動 器10與驅動控制器20的連接方式係採争聯或並聯、甚至其 他方式。採串聯方式的驅動控制器20 —樣可以控制所有驅動 器10 —起作動；而採並聯方式的驅動控制器20也可以·控制 所有驅動器10使其依序作動。本發明所提出的方法，可以適 用於驅動控制器與驅動器間是採串聯、並聯、或其他方式的 連接方式。 • 上述將LED水平排列、再以驅動器10同時明滅同一列 的LED，主要是為了配合LCD的掃礙動作（但請注意到，LED 的列數η和LCD的掃猫線數不一定一樣），而本發明的主要 特點就在於，在LCD垂直同步訊號（Vsync)所定義的一個 晝面時間（frame time )裡，如何控制η歹LED的明滅，以 將因為液晶的物理延遲特性（反應速度低）而本質上屬於持 續型（hold type )的LCD，達到類似陰極射線管（cathode rate 鲁 tube, CRT )的脈衝型（impulse type )顯示器的效果，而同時 使其達到減低LCD模糊（blur )、閃燦（flicker )的目的。 第2a、2b、2c圖所示係本發明第一實施例的幾種變化的 控制訊號的波形時序圖。如圖所示，此實施例係在LCD垂直 同步訊號所定義的一個標準畫面時間（1/60秒）内，對每列 LED施以相同的驅動控制脈波訊號，但是各列的驅動控制脈 波訊號的相位是由上而下逐步推延的。如圖所示，在一晝面 12725621272562 IX. Description of the Invention: [Technical Field] The present invention relates to a direct-illumination backlight module using a plurality of light-emitting diodes as a light source, and more particularly to controlling each column of light-emitting backlights of a direct-illumination backlight module The polar method. [Prior Art] At present, a large-sized liquid crystal display (LCD) or a liquid crystal television (LCD TV) backlight module uses a cold cathode fluorescent lamp (CCFL) or a light-emitting diode. A light emitting diode (LED) is a direct illumination method of a light source. Due to the use of mercury mercury vapor inside the CCFL lamp, there are environmental problems in production and subsequent recycling. Together with the perfect LED technology, its color rendering, switching speed, luminous efficiency and cost are more advantageous than CCFL lamps. The color and brightness control is also extremely flexible and easy, so LED has gradually replaced the CCFL lamp as the main light-emitting component of the backlight module. Fig. 7 is a schematic view showing a conventional direct-illumination backlight module using LED as a light source. As shown in the figure, a plurality of LEDs are arranged in a matrix and arranged in front of a reflective panel. The LED can be a white LED or an LED composed of red, green and blue light. A diffusion sheet and a sm sheet are provided in front of the LED to provide an effect of homogenizing and enhancing brightness. It is well known that LCDs are continuous displays because of the retardation characteristics of liquid crystal molecules. Compared with pulse-type cathode ray tube displays, the quality of the impact of lcd 1272562 has always been inferior, which is also the academic and industry Continuous research and development focus, and therefore various technologies to improve the speed of lcd reaction have been publicly revealed. In the past, the focus of backlight modules has always been on how to improve the uniformity and brightness of the surface light provided by the backlight module. Since the direct-illumination backlight module with LED as the light source has gradually become the mainstream, because the reaction speed of the LED can be extremely fast and the control can be very flexible, in addition to the uniformity and the brightness of the surface light, the backlight can also be utilized. The fast LED display of the device improves the dynamic image quality of the LCD. SUMMARY OF THE INVENTION Therefore, the main feature of the present invention is that, in a facet time defined by the vertical sync signal of the LCD, the brightness of each column lED of the backlight module is controlled to be due to the physical delay characteristics of the liquid crystal (reaction speed) Low) and essentially a performance-type LCD, which achieves the effect of a pulse-type display similar to a cathode ray tube, and reduces the blurring and flickering of the LCD. The method proposed by the present invention is implemented in a drive controller of a direct-illumination backlight module in which a plurality of light-emitting diodes are used as a light source. The method proposed by the invention can be broadly divided into two categories, the LEDs arranged in the horizontal arrangement of the backlight device, and the scanning with the LCD, showing a certain brightness and darkness in a screen time from bottom to bottom. And achieve a broom-like effect. Such a method can further improve the liquid crystal reaction speed of 1272562 or improve the blurring disadvantages by gradually lighting, delaying lighting, stepping lighting or darkening in each column (four). Another method is to apply the same control signal to each column of LEDs. In other words, such a method achieves a flash, not a scan effect. Both of these methods can achieve the effect of controlling the brightness of the backlight module by adjusting the duty cycle of the control signal. The above and other objects and advantages of the present invention will be described in detail with reference to the accompanying drawings and claims. However, the appended drawings are purely illustrative of the spirit of the invention and are not to be construed as limiting the scope of the invention. For the definition of the scope of the invention, please refer to the attached patent application. [Embodiment] The method proposed by the present invention is implemented as a driver controller of a direct-lit backlight module using a plurality of light-emitting diodes (LEDs) as a light source. Inside. Please note that this direct-lit backlight module is suitable for liquid crystal display (LCD), plasma (plasma) displays, and backlight modules for organic light emitting displays (“LEDs”). The following is a simplified description, mainly using LCD as an example to explain and explain the spirit and operation principle of the present invention. The driving controller embodying the present invention connects and controls a plurality of drivers of the direct-illumination backlight module in an appropriate connection manner, and the plurality of LEDs of the direct-illumination backlight module are divided by the drivers Push (that is, control its 7 1272562 sequence control signal to control each driver. Similarly, the invention does not limit the connection mode of the driver 10 and the drive controller 20 to be connected or parallel, or even other methods. The controller 20 can control all the drivers 10 to act as well; and the parallel drive controller 20 can also control all the drivers 10 to operate in sequence. The method proposed by the present invention can be applied to the drive controller and The drive is connected in series, in parallel, or in other ways. • The above LEDs are arranged horizontally and the same column is simultaneously extinguished by the driver 10, mainly for the purpose of matching the LCD (but please note that the LED The number of columns η and the number of sweeping cat lines of the LCD are not necessarily the same), and the main feature of the present invention is that it is defined by the vertical sync signal (Vsync) of the LCD. In the frame time, how to control the annihilation of the 歹 歹 LED, so that the LCD is essentially a hold type LCD due to the physical delay characteristic of the liquid crystal (the reaction speed is low), and it is similar to a cathode ray tube ( The effect of the pulse type (impulse type) display of the cathode rate, while at the same time achieving the purpose of reducing the blur and flicker of the LCD. Figures 2a, 2b, and 2c show the present invention. Waveform timing diagram of several modified control signals of the first embodiment. As shown, this embodiment applies a LED to each column within a standard picture time (1/60 second) defined by the LCD vertical sync signal. The pulse signal is controlled by the same drive, but the phase of the drive control pulse signal of each column is gradually deferred from top to bottom. As shown in the figure, in one face 1272562
S才間裡~開始弟一列LED是關閉的、而其他各列是點亮的， 接下來，第二列L E D是關閉的、而其他各列L D (包含原先 關閉的第-列LED)是點亮的，然後依此類推。也就是說， 在同-畫面時間裡’每—列LED的驅動控制脈波訊號的第— ㈣波的開始時間’也就是驅動控制脈波訊號的第—次正緣 —e edge)上升的時間，如圖中所示i〇n (led導通電 流）的時點，是依照各列LED從上而下的位置，由第—列（We 1)、第二列（Line2)逐步往後推延的。在—個晝面時間裡以 這種方式控制n列LED的效果就如同從上而下逐列關閉 led’到達最下—列（Linen)後再從頭由第—列開始循環。 第2a、2b、2e圖所示的這三個變化中，其驅動控制脈波訊號 的頻率疋畫面速率的整數倍’如第2a圖的頻率是i2〇Hz (兩 倍晝面速率），所以在一晝面時間裡，每一列led會被關閉 二次；第2b圖的頻率是180Hz (三倍晝面速率），所以在一 畫面時間裡，每一列led會被關閉三次；而第2c圖則是24〇Hz (四倍晝面速率），所以在一晝面時間裡，每一列LED會被 關閉四次。除了驅動控制脈波訊號的頻率變化以外，對於每 一列LED所施加的驅動控制脈波訊號，調整其工作週期（加以 cycle )大小（如圖中所示的虛線部分）可以達到直照式背光 模組亮度控制（brightness control)的效果，也就是在相同的 驅動控制脈波訊號頻率下，其工作週期愈大，則背光模組的 1272562 亮度愈高。因此上述的三種變化還可以進一步辅以適當的控 制訊號工作週期，以達到更佳的效果。 第3a圖所示係本發明第二實施例的控制訊號的波形時序 圖。本實施例也可以視為第一實施例的延伸，也就是當以一 適當頻率對每列LED施以工作週期為對稱的50%的驅動控制 脈波訊號時，就會得到如第3a圖所示的波形時序圖。此第二 實施例是使奇數列的LED以一適當頻率點亮與變暗，同時以 # 延遲該適當頻率1/2週期的方式（也就是反相的方式）對所 有偶數列以同一頻率點亮與變暗。其綜合的效果就是，在一 晝面時間裡，背光模組會有奇數列同亮而偶數列同暗、或奇 數列同暗而偶數列同亮的多次交互明滅的情形。第3b、3c、 3d、3e圖係本實施例的三種變化。這三種變化的用意都在於 考慮：（1)配合LCD的由上而下的掃瞄；（2)降低液晶的延遲 特性所造成的影響；以及（3)降低因相鄰列的LED的點亮，而 • 使光擴散到變暗的LED列的影響，因此結合了類似第一實施 例的逐列控制LED的作法。 例如第3b圖所示，其配合LCD的由上而下的掃瞄，當 - LCD的一掃猫線被致能（enabled)時，因為液晶分子的反應 速度慢，在這條掃瞄線的像素在一晝面時間裡逐漸的逼近其 目標灰階值的暫態過程中，這條掃瞄線所對應背光模組的那 列LED就將驅動控制訊號的脈波降到一較低的水準，使得暫 62 恶過程不那麼顯著，然後那列led在下一次被點亮時再恢愎 到正常的驅動控制訊號水準。而其綜合的效果就是，在一晝 面時間裡’背光模組的奇數列、偶數列LED多次交互明滅的 過私中’可以看出背光模組的各列LED，會配合面板的掃瞄 線的由上而下的掃瞄，從上而下各列LED逐列變的較為黯 淡，到達最下一列後，在下一晝面時間再從頭由第一列開始 循環。也就是說，在一畫面時間裡，第一次奇數列lED同亮 守第列led要比其他同亮的奇數列led要來的黯淡， 接下來，第一次偶數列LED同亮時，第二列LED要比其他 同Ai的偶數列led要來的黯淡，接下來，第二次奇數列led 同焭時，第三列LED要比其他同亮的奇數列lED要來的黯 淡，然後以此類推。 第3c圖和第3b圖類似，但不是採用較低的驅動控制訊 號，而是暫停（或是延遲）施予驅動控制訊號，而其綜合的 效果就是在一畫面時間裡，背光模組的奇數列、偶數列LED 多次交互明滅的過程中，可以看出背光模組的各列LED，會 配合面板的掃瞄線的由上而下的掃瞄，從上而下各列LED逐 列被關閉，到達最下一列後，在下一畫面時間再從頭由第一 列開始循環。也就是說，在一畫面時間裡，第一次奇數列LED 同亮時，第一列LED和所有偶數列LED都是關閉的，接下 來，第一次偶數列LED同亮時，第二列LED和所有奇數列 12In the S-room, the LEDs are turned off and the other columns are lit. Next, the second column of LEDs is turned off, and the other columns of LDs (including the first-column LEDs that were originally turned off) are points. Bright, and so on. That is to say, in the same-picture time, the start time of the (fourth) wave of the driving control pulse signal of each column LED is the time when the first positive edge-e edge of the driving pulse signal is rising. The time point of i〇n (led on current) as shown in the figure is gradually deferred from the first column (We 1) and the second column (Line 2) according to the position of the LEDs from top to bottom in each column. In this way, the effect of controlling the n-column LEDs in this way is like closing the led's from the top down to the bottom-column (Linen) and then starting from the first column. In the three changes shown in Figures 2a, 2b, and 2e, the frequency of the drive control pulse signal is an integer multiple of the picture rate. The frequency in Fig. 2a is i2 〇 Hz (twice the face rate), so In a face time, each column led will be turned off twice; the frequency of Figure 2b is 180Hz (three times the face rate), so in a picture time, each column led will be closed three times; and the second c picture It is 24 Hz (four times the face rate), so in a single time, each column of LEDs will be turned off four times. In addition to driving the frequency change of the control pulse signal, the drive control pulse signal applied to each column of LEDs is adjusted to the duty cycle (as shown in the dotted line) to achieve a direct illumination backlight mode. The effect of the brightness control, that is, the greater the duty cycle of the same drive control pulse signal frequency, the higher the brightness of the 1272762 backlight module. Therefore, the above three changes can be further supplemented by an appropriate control signal duty cycle to achieve better results. Fig. 3a is a waveform timing chart of the control signal of the second embodiment of the present invention. This embodiment can also be regarded as an extension of the first embodiment, that is, when a drive control pulse wave signal with a duty cycle of 50% is applied to each column of LEDs at an appropriate frequency, the image as shown in FIG. 3a is obtained. The waveform timing diagram shown. This second embodiment is to illuminate and darken the LEDs of the odd-numbered columns at a suitable frequency while delaying the appropriate frequency by 1/2 period (that is, in an inverted manner) to the same frequency point for all even columns. Bright and dark. The combined effect is that in a dry time, the backlight module will have an odd number of columns with the same bright and even columns with the same darkness, or an odd column with the same dark and even columns with the same multiple brightening. The 3b, 3c, 3d, 3e diagrams are three variations of this embodiment. The purpose of these three changes is to consider: (1) top-down scanning with LCD; (2) reducing the effects of delay characteristics of liquid crystals; and (3) reducing lighting of LEDs in adjacent columns. And • the effect of diffusing light to the dimmed LED column, thus incorporating a column-by-column control of the LED similar to the first embodiment. For example, as shown in Fig. 3b, it cooperates with the top-down scanning of the LCD. When the sweep line of the LCD is enabled, the pixel of the scan line is slow because the reaction speed of the liquid crystal molecules is slow. During the transient process of gradually approaching the target grayscale value in a dry time, the LED of the backlight module corresponding to the scan line will drive the pulse of the control signal to a lower level. This makes the temporary 62 evil process less noticeable, and then the column led to the normal drive control signal level when it is next lit. The comprehensive effect is that in an instant time, the odd-numbered column and the even-numbered column LED of the backlight module interact with each other in multiple times, and it can be seen that the LEDs of the backlight module are matched with the scanning of the panel. From the top-down scanning of the line, the LEDs from the top to the bottom are changed from column to column. After reaching the next column, the next column starts from the first column. That is to say, in the first time of the picture, the first odd-numbered column lED is the same as the other LEDs that are brighter than the other columns. Next, when the first even-numbered column LED is lit, the first The two columns of LEDs are more bleak than the other even columns of Ai. Next, when the second odd column is led, the third column of LEDs is fainter than the other brighter columns of lED, and then This type of push. Figure 3c is similar to Figure 3b, but instead of using a lower drive control signal, it pauses (or delays) the drive control signal, and the overall effect is that the backlight module is odd in one frame time. In the process of multiple columns and even columns of LEDs interacting and extinguishing multiple times, it can be seen that the LEDs of each column of the backlight module will match the scan of the scan line of the panel from top to bottom, and the LEDs from top to bottom are column by column. Close, after reaching the next column, cycle from the first column from the beginning at the next screen time. That is to say, in the first time, when the first odd-numbered column LED is on, the first column of LEDs and all the even-numbered columns of LEDs are turned off. Next, when the first even-numbered column of LEDs is on, the second column is LED and all odd columns 12
1272562 ㈣都是_的，接下來，第L彳啦同亮時，第二 列腳和所有偶數列LED都是關_，然後以此_。其 综合的效果就是’在—畫面時間裡，背光模組的奇數列、偶 數列㈣多次交互明滅的過程中，可以看出背光模組的各列 ㈣，會配合面板的_線的由上而下的_，從上而下有 數列LED同時變暗（也就是—條比較寬的「暗帶」），到達最 下一列後再從頭由第-列開始循環。這樣的好處是，和「暗 帶」相鄰、點亮的㈣列的光線，只有少數會、或是不會擴 散到目前致能的_線下方’確實使得暫態過程不會或不那 麼顯著的呈現出來。 第3d圖則是第3b、3c圖兩者的綜合，也就是配合⑽ 的由上而下的掃瞎，從上而獨背光模纟且的各列1272562 (4) are all _, then, when the L is lit, the second column and all even columns of LEDs are off _, and then _. The comprehensive effect is that in the process of the screen time, the odd-numbered column and the even-numbered column (four) of the backlight module are interacting and extinguishing multiple times. It can be seen that the columns of the backlight module (4) will match the _ line of the panel. The next _, from top to bottom, several columns of LEDs are simultaneously darkened (that is, a relatively wide "dark band"), and after reaching the next column, the loop starts from the first column. The advantage of this is that the light in the (four) column adjacent to the "dark band", only a few will or will not spread below the currently enabled _ line does make the transient process not or not so significant. Presented out. The 3d figure is a combination of the 3b and 3c diagrams, that is, the top-down broom of the (10), and the backlights from the top.
LED，逐歹丨J 延遲施予驅動控制訊號，而在此之後開始點亮時，先由一較 低的驅動㈣訊號開始，再恢復到正㈣驅動控制訊號。 第3e圖則疋第3d圖的變化，也就是在配合[CD的由上 而下的掃瞄時’從上而下對背光模組的各列lEd逐列延遲施 予驅動控制汛號前，先將驅動控制訊號的脈波降到一較低的 水準，而在變暗之後時，再由一較低的驅動控制訊號開始， 再恢復到正常的驅動控制訊號。第3d、3e圖都能夠進一步降 低因相鄰列的LED的點亮，而使光擴散到變暗的LED列的 影響。 13 1272562 第4a、4b、4c、4d圖所示係本發明第三實施例的幾種變 化的控制訊號的波形時序圖。其與第3a、3b、3c、3e圖極為 類似，只是是對每列LED施以工作週期非為對稱（叫咖㈣ 的驅動控制脈波，所以奇數列或偶數列同時亮的時間要比同 時暗的時間長、或是奇數列或偶數列同時暗的時間要比同時 亮的時間長。或者，也會有所有列都亮或都暗的情形。相關 的細節就不再贅述。 第5a圖所示係本發明第四實施例的控制訊號的波形時序 圖。此實施例其實是第一實施例，搭配上第二、三實施例的 逐步、炎冗的作法。此實施例在一個畫面時間内，每一列led 的驅動控制脈波訊號在第一次關閉該列LED後重新點亮時， 也就是驅動控制脈波訊號的第一次正緣上升，並不是直接由 暗轉為亮，而是以一步進的方式逐步調升其驅動控制訊號， 以達到模糊控制（blur control)的目的。第5a圖的作法可以 適用於第2a、2b、2c圖所示的各種為畫面速率整數倍的驅動 控制脈波訊號頻率。本實施例同樣可以調整其驅動控制脈波 汛號工作週期大小（如圖中所示的虛線部分）來達到亮度控 制的效果。第5b、5c圖所示係第5a圖的變化。第5b圖係一 個晝面時間内，每一列LED的驅動控制脈波訊號在第一次關 閉該列LED時，也就是驅動控制脈波訊號的第一次正緣上升 前的負緣（negative edge)下降，並不是直接由亮轉為暗，而 14 1272562 是以一步進的方式逐步調降其驅動控制訊號。第讣圖所示係 結合了第5a圖的逐步調升，但這兩種作法不是—定要配合實 施，也可以分開單獨實施。第5e圖所示係逐步調降與逐步調 升的步進階數或每階雜可以不必相同，而可以視液晶材料 的特性加以調整。 前述幾種實施例都可以達到一種掃瞄的效果，也就是 說，各列LED從上到下逐列的表現出某種明暗特性。第如 圖所不係本發明第五實施例的控制訊號的波形時序圖。此實 施例則是對各列LED同步施予頻率為畫面速率整數倍（例如 120Hz、180Hz、240Hz等）的驅動控制脈波訊號，換言之， 此一實施例係達到一種閃光（flash )、而非掃瞄的效果。本實 施例同樣可以調整其驅動控制脈波訊號工作週期大小（如圖 中所不的虛線部分）來達到亮度控制（brightnessc〇ntr〇〇的 效果。第6b、6c圖則分別是驅動控制脈波訊號的工作週期為 對稱或非對稱的兩種變化。 藉由以上較佳具體實施例之詳述，係希望能更加清楚描 述本創作之特徵與精神，而並非以上述所揭露的較佳具體實 施例來對本創作之範疇加以限制。相反地，其目的是希望能 涵蓋各種改變及具相等性的安排於本創作所欲申請之專利範 圍的範轉内。 【圖式簡單說明】 15 1272562 施的直照式背光模組的驅動 〇 一實施例的幾種變化的控制 第1 a、1 b圖所例示係本發明所實 器與驅動控制器的二種可能配置 第2a、2b、2c圖所示係本發明第 訊號的波形時序圖。 弟3a、3b、3c、3d、3e圖所示係本發明第二實施例的幾種變 化的控制訊號的波形時序圖。 第4a、4b、4C、4d圖所示係本發明第三實施例的幾種變化的The LED, delaying the application of the drive control signal, and then starting to light up, starts with a lower drive (four) signal and then returns to the positive (four) drive control signal. The change of the 3d picture in Fig. 3e, that is, before the [upper and lower scanning of the CD] is applied to the column lEd of the backlight module from top to bottom, the drive control nickname is delayed. The pulse of the drive control signal is first lowered to a lower level, and after darkening, a lower drive control signal is started, and then the normal drive control signal is restored. Both the 3d and 3e diagrams can further reduce the influence of the light being diffused to the dimmed LED column due to the lighting of the LEDs in the adjacent columns. 13 1272562 Figures 4a, 4b, 4c, and 4d show waveform timing diagrams of several variations of the control signals of the third embodiment of the present invention. It is very similar to the 3a, 3b, 3c, and 3e diagrams, except that the duty cycle of each column of LEDs is not symmetric (called the coffee (four) drive control pulse wave, so the odd column or the even column is simultaneously brighter than the same time Dark time is long, or odd or even columns are darker at the same time than at the same time. Or, all columns are bright or dark. The relevant details are not repeated. The waveform timing chart of the control signal of the fourth embodiment of the present invention is shown. This embodiment is actually a first embodiment, which is combined with the step-by-step, tedious operation of the second and third embodiments. This embodiment is in a picture time. Inside, each column of the LED drive control pulse signal is re-ignited after the first time the column LED is turned off, that is, the first positive edge rise of the drive control pulse signal is not directly changed from dark to bright, and The drive control signal is stepped up in a stepwise manner to achieve the purpose of blur control. The method of Fig. 5a can be applied to the various integers of the picture rate shown in Fig. 2a, 2b, and 2c. Drive control pulse The number of frequencies can also be adjusted in this embodiment by the size of the drive control pulse 汛 signal (as shown in the dotted line in the figure) to achieve the brightness control effect. The 5b, 5c diagram shows the change of the 5th figure. Figure 5b shows the driving edge of each column of LEDs. When the LEDs are turned off for the first time, that is, the negative edge before the first positive edge rise of the drive pulse signal (negative edge) The decline is not directly from bright to dark, and 14 1272562 is to gradually reduce its drive control signal in a step-by-step manner. The figure shown in the figure is a step-by-step adjustment of Figure 5a, but the two methods It is not necessary to cooperate with the implementation, but it can also be implemented separately. Figure 5e shows that the step-by-step or step-by-step adjustment of the step-by-step or step-by-step adjustment may not be the same, but can be adjusted according to the characteristics of the liquid crystal material. In some embodiments, a scanning effect can be achieved, that is, each column of LEDs exhibits some sort of light and dark characteristics from top to bottom. The figure is not in accordance with the control signal of the fifth embodiment of the present invention. Waveform timing In this embodiment, the driving control pulse signals of the LEDs of the respective columns are simultaneously applied at an integer multiple of the picture rate (for example, 120 Hz, 180 Hz, 240 Hz, etc.), in other words, this embodiment achieves a flash, Instead of scanning, this embodiment can also adjust the driving cycle of the pulse signal (such as the dotted line in the figure) to achieve brightness control (brightnessc〇ntr〇〇 effect. 6b, 6c Then, the duty cycle of driving the control pulse wave signal is respectively symmetrical or asymmetrical. The details of the above preferred embodiments are intended to more clearly describe the features and spirit of the present invention, and not the above. The preferred embodiments disclosed are intended to limit the scope of the present invention. On the contrary, the purpose is to accommodate changes and equivalence arrangements within the scope of the patent application to which this creative is intended. [Simple description of the drawings] 15 1272562 The driving of the direct-illumination backlight module is controlled by several variations of the first embodiment, and the first embodiment of the present invention is exemplified by the two embodiments of the present invention. It is possible to configure the waveform timing diagrams of the first signal of the present invention as shown in Figs. 2a, 2b, and 2c. The waveforms of several variations of the control signals of the second embodiment of the present invention are shown in the drawings 3a, 3b, 3c, 3d, and 3e. Figures 4a, 4b, 4C, and 4d show several variations of the third embodiment of the present invention.
控制訊號的波形時序圖。 第5a、5b、5e圖所示係本發明第四實施例的幾種變化的控制 訊號的波形時序圖。 第6a、6b、6c圖所示係本發明第五實施例的幾種變化的控制 訊號的波形時序圖。 第7圖所示係一種習知的、以]lED為光源的直照式背光模組 的示意圖。The waveform timing diagram of the control signal. Figures 5a, 5b, and 5e show waveform timing diagrams of several modified control signals of the fourth embodiment of the present invention. Figures 6a, 6b, and 6c show waveform timing diagrams of several variations of the control signals of the fifth embodiment of the present invention. Figure 7 is a schematic view of a conventional direct-illumination backlight module with a lED as a light source.
【主要元件符號說明】[Main component symbol description]
Vsync 垂直同步訊號 Line 1 〜Line η 10 驅動器 30 時序控制器Vsync Vertical Synchronization Signal Line 1 ~Line η 10 Driver 30 Timing Controller
Ion LED導通電流 第1列〜第η列LED 20 驅動控制器 16Ion LED on current 1st column to nth column LED 20 drive controller 16