TWI387958B - Method and apparatus for controlling luminance of backlight - Google Patents

Method and apparatus for controlling luminance of backlight Download PDF

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TWI387958B
TWI387958B TW97126430A TW97126430A TWI387958B TW I387958 B TWI387958 B TW I387958B TW 97126430 A TW97126430 A TW 97126430A TW 97126430 A TW97126430 A TW 97126430A TW I387958 B TWI387958 B TW I387958B
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brightness
avg
value
current frame
frame
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TW201003618A (en
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Tien Chu Hsu
Yu An Liu
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Chunghwa Picture Tubes Ltd
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Description

背光亮度控制方法與裝置Backlight brightness control method and device

本發明是有關於一種顯示裝置，且特別是有關於可以提升動態影像對比的背光亮度控制方法與裝置。The present invention relates to a display device, and more particularly to a backlight brightness control method and apparatus that can improve dynamic image contrast.

對於具有背光(Backlight)的顯示裝置而言，利用動態背光(Dynamic Backlight Luminance,DBL)技術可以提升顯示面板的動態對比。在亮態畫面時，動態背光技術維持正常背光亮度。在暗態畫面時，動態背光技術可以調暗背光亮度，使暗態畫面能呈現更深沈的黑。因此，動態背光技術可以提高顯示面板在明暗畫面的對比。例如，假設亮畫面的顯示亮度為300nits，經動態背光的系統演算後無需做背光亮度的調整，故最終面板畫面呈現亮度(使用者觀點)仍為300nits。反之，假設暗態畫面的顯示亮度為1nits，經動態背光的系統演算而使背光做50%的亮度調整，故面板畫面呈現亮度為0.5nits。如此，具有動態背光的顯示面板，其對比由靜態的300：1，提升為動態的600：1。For display devices with backlights, dynamic backlighting (Dynamic Backlight Luminance, DBL) technology can be used to improve the dynamic contrast of the display panel. Dynamic backlighting maintains normal backlight brightness during bright scenes. In the dark state of the picture, dynamic backlight technology can dim the brightness of the backlight, so that the dark state of the picture can be deeper black. Therefore, dynamic backlight technology can improve the contrast of the display panel in the light and dark picture. For example, suppose that the display brightness of the bright picture is 300 nits, and the backlight brightness adjustment is not required after the dynamic backlight system calculation, so the brightness of the final panel picture (user's point of view) is still 300 nits. On the contrary, assuming that the display brightness of the dark state picture is 1 nits, the backlight is 50% adjusted by the system calculation of the dynamic backlight, so the panel picture brightness is 0.5 nits. As such, the display panel with dynamic backlighting is enhanced from a static 300:1 to a dynamic 600:1.

然而，傳統動態背光技術雖然可以隨著顯示畫面的明暗而動態地調整背光亮度，但當顯示畫面有明確的明亮變化之時，傳統動態背光技術卻會造成背光源無法即時反應，而造成亮度不自然的感覺。However, although the traditional dynamic backlight technology can dynamically adjust the brightness of the backlight according to the brightness of the display screen, when the display screen has a clear bright change, the conventional dynamic backlight technology may cause the backlight to be unable to react immediately, resulting in no brightness. The feeling of nature.

圖1是說明傳統動態背光技術對應於顯示面板之亮度而動態調整背光亮度的圖框時序圖。如圖1所示，其橫軸 表示時間。圖1的上列各個方塊表示顯示面板之畫面亮度隨著時間而變化；下列各個方塊表示背光之亮度對應於顯示面板之亮度而變化。傳統動態背光技術是利用長時間的圖框(Frame)亮度平均值，調整對應的背光亮度。亦即，將前x 個圖框亮度做平均，求得目前圖框所對應的背光亮度，並將背光源調整至該亮度，使顯示面板能呈現較暗的畫面。此種傳統的動態背光調整方式，在畫面亮度變化緩慢的影片中，並不會有太大的影響。如圖1所示，時間範圍T1中，顯示面板的畫面亮度變化是緩慢的，因此傳統的動態背光調整方式可以對應地調整背光源的亮度。1 is a timing diagram illustrating a frame in which a conventional dynamic backlight technology dynamically adjusts backlight brightness in accordance with brightness of a display panel. As shown in Fig. 1, the horizontal axis represents time. The squares in the upper row of FIG. 1 indicate that the brightness of the screen of the display panel changes with time; the following squares indicate that the brightness of the backlight varies according to the brightness of the display panel. The traditional dynamic backlight technology uses a long-term frame brightness average to adjust the corresponding backlight brightness. That is, the brightness of the first x frames is averaged, the brightness of the backlight corresponding to the current frame is obtained, and the backlight is adjusted to the brightness, so that the display panel can present a darker picture. This traditional dynamic backlight adjustment method does not have much influence in movies with slow changes in picture brightness. As shown in FIG. 1 , in the time range T1, the screen brightness change of the display panel is slow, so the conventional dynamic backlight adjustment mode can adjust the brightness of the backlight correspondingly.

但對於畫面亮度變化較快的影片，傳統動態背光技術會有反應不過來的情形發生，亦即背光源無法即時對應地調整亮度。如圖1所示，在第N個圖框時，顯示面板所顯示的影像由暗畫面(亮度為1nits)跳成亮畫面(亮度為300nits)，但背光因為傳統動態背光技術利用「前x 個圖框的平均亮度」，無法隨著畫面立即對應地改變背光亮度(如虛線框所示)。亦即，傳統動態背光技術利用第N、N-1、N-2、...、N-x+1個圖框去計算平均亮度，使得第N個圖框的背光亮度只有理想亮度的一半。這種錯誤的背光亮度需要經過x 個圖框的時間，才能夠把背光調整至最適合的亮度。However, for a movie with a brighter picture brightness, the traditional dynamic backlight technology may not respond to the situation, that is, the backlight cannot adjust the brightness correspondingly. As shown in Figure 1, in the Nth frame, the image displayed on the display panel is jumped into a bright picture (with a brightness of 300nits) by a dark picture (with a brightness of 1nits), but the backlight uses the "front x " because of the traditional dynamic backlight technology. The average brightness of the frame cannot change the backlight brightness as the picture immediately corresponds (as indicated by the dashed box). That is, the conventional dynamic backlight technology uses the Nth, N-1, N-2, ..., N-x+1 frames to calculate the average brightness, so that the backlight brightness of the Nth frame is only half of the ideal brightness. . This erroneous backlight brightness requires x frames of time to adjust the backlight to the most appropriate brightness.

上述缺陷在明亮變化明顯的影片上應用時，人眼更會感受到亮度的變化。解決上述缺陷可以設定較小的x 值。然而，當x 值小時，表示背光亮度的平均計算時間較短， 使得背光易受影片(畫面資料)的些微明亮變化而產生明顯的亮暗閃爍。當x 值大時，表示背光亮度平均計算時間較長，面板的亮度較不易受影片明亮變化的影響；但當影片有明確的明亮變化時(如圖1在第N個圖框亮度由1nits突然變為300nits)，卻會造成面板亮度無法即時反應，而造成亮度不自然的感覺。When the above defects are applied to a film with a bright change, the human eye feels a change in brightness. To solve the above defects, a smaller x value can be set. However, when the value of x is small, the average calculation time indicating the brightness of the backlight is short, so that the backlight is susceptible to slight brightness changes of the film (picture material) to produce a noticeable bright and dark flicker. When the value of x is large, it means that the average brightness of the backlight is calculated for a long time, and the brightness of the panel is less affected by the bright change of the film; but when the film has a clear bright change (as shown in Figure 1, the brightness of the Nth frame is suddenly 1 nits). It becomes 300nits), but it will cause the panel brightness to not react instantly, resulting in an unnatural feeling of brightness.

本發明之目的是提供一種背光亮度控制方法與裝置，以解決影片(畫面)有明確的明亮變化時，面板亮度無法即時反應的問題。It is an object of the present invention to provide a backlight brightness control method and apparatus for solving the problem that the brightness of the panel cannot be immediately reacted when the film (picture) has a clear bright change.

為達上述或是其他目的，本發明提出一種背光亮度控制方法。首先，計算目前圖框之亮度特徵值。將目前圖框與先前圖框二者之亮度特徵值進行比較。若目前圖框的亮度特徵值與先前圖框的亮度特徵值二者之絕對差值小於閥值，則將目前圖框與其先前的多個圖框之亮度特徵值進行平均運算，以獲得平均亮度特徵值。若目前圖框的亮度特徵值與先前圖框的亮度特徵值二者之絕對差值大於閥值，則以目前圖框之亮度特徵值做為平均亮度特徵值。最後，依據平均亮度特徵值調整背光亮度。To achieve the above or other objects, the present invention provides a backlight brightness control method. First, calculate the brightness feature value of the current frame. Compares the brightness feature values of both the current frame and the previous frame. If the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is less than the threshold, the current frame is averaged with the brightness feature values of the previous plurality of frames to obtain an average brightness. Eigenvalues. If the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is greater than the threshold, the brightness feature value of the current frame is used as the average brightness feature value. Finally, the backlight brightness is adjusted according to the average brightness characteristic value.

為達上述或是其他目的，本發明提出一種背光亮度控制裝置，包括第一計算單元、第二計算單元以及驅動單元。第一計算單元接收目前圖框之像素資料，以計算目前圖框之亮度特徵值。第二計算單元耦接至第一計算單元，用以 比較目前圖框與先前圖框二者之亮度特徵值。若目前圖框的亮度特徵值與先前圖框的亮度特徵值二者之絕對差值小於一閥值，則第二計算單元將目前圖框與其先前的多個圖框之亮度特徵值進行平均運算，以獲得平均亮度特徵值。若目前圖框的亮度特徵值與先前圖框的亮度特徵值二者之絕對差值大於閥值，則第二計算單元以目前圖框之亮度特徵值做為平均亮度特徵值。驅動單元耦接於第二計算單元與背光源之間，用以驅動背光源以提供背光亮度，並且依據平均亮度特徵值調整背光亮度。To achieve the above or other objects, the present invention provides a backlight brightness control apparatus including a first calculation unit, a second calculation unit, and a drive unit. The first calculating unit receives the pixel data of the current frame to calculate the brightness feature value of the current frame. The second computing unit is coupled to the first computing unit for Compare the brightness feature values of both the current frame and the previous frame. If the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is less than a threshold, the second calculating unit averages the brightness feature values of the current frame and the previous plurality of frames. To obtain an average brightness characteristic value. If the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is greater than the threshold, the second calculating unit uses the brightness feature value of the current frame as the average brightness feature value. The driving unit is coupled between the second computing unit and the backlight to drive the backlight to provide backlight brightness, and adjust the backlight brightness according to the average brightness characteristic value.

本發明因比較目前圖框與先前圖框二者之亮度特徵值，因此可以隨時判斷畫面有無明確的明亮變化。若畫面的明亮變化並沒有很明確，則進行平均運算以獲得平均亮度特徵值；反之，若畫面的明亮變化很明確，則以目前圖框之亮度特徵值做為平均亮度特徵值。因此，當影片(畫面)有明確的明亮變化時，背光亮度可以即時地跟隨畫面亮度而反應。亦即，若目前圖框的亮度與先前圖框的亮度異差過大，即立刻修正平均亮度特徵值，使背光亮度與顯示面板的灰階亮度能立刻顯示最適合的亮度輸出，而解決了傳統動態背光技術造成亮度不自然的問題。Since the present invention compares the brightness characteristic values of both the current frame and the previous frame, it is possible to judge whether the picture has a clear bright change at any time. If the brightness change of the picture is not clear, the averaging operation is performed to obtain the average brightness feature value; conversely, if the brightness change of the picture is clear, the brightness feature value of the current frame is used as the average brightness feature value. Therefore, when the film (picture) has a clear bright change, the backlight brightness can be immediately reflected in the picture brightness. That is, if the brightness of the current frame is too different from the brightness of the previous frame, the average brightness characteristic value is corrected immediately, so that the brightness of the backlight and the gray level brightness of the display panel can immediately display the most suitable brightness output, thereby solving the traditional Dynamic backlighting causes problems with unnatural brightness.

為讓本發明之上述和其他目的、特徵和優點能更明顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下。The above and other objects, features and advantages of the present invention will become more <RTIgt;

圖2是依照本發明實施例說明一種背光亮度控制方法的流程圖。系統首先進行步驟S210，以便擷取/接收目前圖框(Frame，例如為第n個圖框)。在系統擷取目前圖框的像素資料(例如RGB灰階值)後，便可以計算目前圖框之亮度特徵值(步驟S220)。於本實施例中，可以將目前圖框中每一個像素的RGB灰階值轉換為每一個像素的亮度值(或稱亮度灰階值)，然後計算目前圖框中所有像素的亮度值之平均值(AVGn )，以做為目前圖框之亮度特徵值。步驟S220可以將目前圖框的亮度特徵值儲存於系統中，以備後續使用。FIG. 2 is a flow chart illustrating a backlight brightness control method according to an embodiment of the invention. The system first proceeds to step S210 to capture/receive the current frame (for example, the nth frame). After the system captures the pixel data of the current frame (for example, the RGB grayscale value), the brightness feature value of the current frame can be calculated (step S220). In this embodiment, the RGB grayscale value of each pixel in the current frame can be converted into the luminance value (or the luminance grayscale value) of each pixel, and then the average of the luminance values of all the pixels in the current frame can be calculated. The value (AVG n ) is used as the luminance feature value of the current frame. In step S220, the brightness feature value of the current frame may be stored in the system for later use.

於另一實施例中，步驟S220可以計算目前圖框的部分像素(例如奇數個掃描線的像素)的亮度值，然後計算這些部分像素亮度值之平均值，以做為目前圖框之亮度特徵值。在又一實施例中，步驟S220可以統計目前圖框中所有像素的亮度分佈，以獲知在多個亮度範圍中何者的像素數量最多。在篩選出像素數量最多的「亮度範圍」後，便可以取得此一「亮度範圍」的代表亮度值(例如此一「亮度範圍」的上邊界值、下邊界值、或是中間值)。然後，以此「代表亮度值」做為目前圖框之亮度特徵值。In another embodiment, step S220 may calculate brightness values of a part of pixels of the current frame (for example, pixels of an odd number of scan lines), and then calculate an average value of the brightness values of the partial pixels as the brightness characteristics of the current frame. value. In still another embodiment, step S220 may count the luminance distribution of all pixels in the current frame to know which of the plurality of luminance ranges has the largest number of pixels. After filtering out the "brightness range" with the largest number of pixels, the representative brightness value of the "brightness range" (for example, the upper boundary value, the lower boundary value, or the intermediate value of the "luminance range") can be obtained. Then, use this "representing the brightness value" as the brightness feature value of the current frame.

接下來進行步驟S230，以比較目前圖框與先前圖框二者之亮度特徵值。換句話說，步驟S230判斷目前圖框與先前圖框二者亮度特徵值的差異是否大於閥值k。於本實施例中，所述「先前圖框」於時序上與目前圖框相鄰；亦即若「目前圖框」為第n個圖框，則「先前圖框」為第n-1 個圖框。於另一實施例中，所述「先前圖框」可以在時序上與目前圖框不相鄰；亦即若「目前圖框」為第n個圖框，則「先前圖框」可能是為第n-2個圖框，或是第n-3個圖框，或是其他圖框。Next, step S230 is performed to compare the brightness feature values of both the current frame and the previous frame. In other words, step S230 determines whether the difference between the luminance feature values of the current frame and the previous frame is greater than the threshold k. In this embodiment, the "previous frame" is adjacent to the current frame in time series; that is, if the "current frame" is the nth frame, the "previous frame" is the n-1th Frames. In another embodiment, the "previous frame" may be non-adjacent to the current frame in time series; that is, if the "current frame" is the nth frame, the "previous frame" may be The n-2th frame, or the n-3th frame, or other frames.

在此假設先前圖框的亮度特徵值是第n-1個圖框的亮度平均值(AVGn-1 )。步驟S230會計算目前圖框的亮度特徵值AVGn 與先前圖框的亮度特徵值AVGn-1 二者之絕對差值，亦即| AVGn -AVGn-1 |。若| AVGn -AVGn-1 |大於閥值k，則進行步驟S240。若| AVGn -AVGn-1 |小於閥值k，則進行步驟S250。上述閥值k可以視需求不同而做調整。於本實施例中，若亮度特徵值是8-bit資料，則閥值k可以介於50至250之間(例如為160)。It is assumed here that the luminance feature value of the previous frame is the luminance average value (AVG n-1 ) of the n- 1th frame. Step S230 calculates the current luminance value of the luminance frame feature characteristic AVG n previous frame and the absolute difference between the two values AVG n-1, i.e. | AVG n -AVG n-1 | . If | AVG n - AVG n -1 | is greater than the threshold k, then step S240 is performed. If | AVG n -AVG n-1 | is smaller than the threshold k, step S250 is performed. The above threshold k can be adjusted depending on the demand. In this embodiment, if the luminance feature value is 8-bit data, the threshold k may be between 50 and 250 (for example, 160).

當| AVGn -AVGn-1 |大於閥值k時，表示前後圖框平均亮度差異過大，系統會自動執行步驟S240，而以目前圖框之亮度特徵值做為「平均亮度特徵值」。例如，計算等式AVGtotal =AVGn ，亦即將代表「前x 個圖框的平均亮度」的參數AVGtotal 替換/修改成目前圖框的亮度特徵值AVGn 。因此，當影片(畫面)有明確的明亮變化時(例如畫面亮度由1nits突然變為300nits)，背光亮度可以立即地跟隨畫面亮度而做修正。When | AVG n -AVG n-1 | is greater than the threshold k, it means that the average brightness difference between the front and back frames is too large, the system will automatically execute step S240, and the brightness feature value of the current frame will be used as the "average brightness feature value". For example, the equation AVG total = AVG n is calculated, that is, the parameter AVG total representing the "average luminance of the first x frames" is replaced/modified to the luminance feature value AVG n of the current frame. Therefore, when the film (picture) has a clear bright change (for example, the picture brightness suddenly changes from 1nits to 300nits), the backlight brightness can be corrected immediately following the picture brightness.

若| AVGn -AVGn-1 |小於閥值k時，表示前後圖框平均亮度差異不大，系統會執行步驟S250，而將目前圖框與其先前的多個圖框之亮度特徵值進行「平均運算」，以獲得新的「平均亮度特徵值」AVGtotal 。前述「平均運算」可 以計算由目前圖框起算，前x 個圖框的亮度特徵值的平均值(x為整數)。例如，計算等式AVGtotal =(AVG’total *x-AVGn-x +AVGn )/x，以獲得新的平均亮度特徵值AVGtotal ，其中AVG’total 為原來的該平均亮度特徵值，AVGn-x 為該目前圖框之先前第x個圖框的亮度特徵值。亦即，只需「前第x 圖框的平均亮度」AVGn-x 與「目前圖框的亮度特徵值」AVGn ，即可以計算新的「前x 個圖框的平均亮度」AVGtotal 。在另一實施例中，其中步驟S250所進行的「平均運算」可以計算等式AVGtotal =[AVG’total *(x-1)+AVGn ]/x，以獲得新的平均亮度特徵值AVGtotal 。If | AVG n -AVG n-1 | is less than the threshold k, it means that the average brightness difference between the front and the back frames is not large, the system will perform step S250, and the current frame and the brightness characteristics of the previous multiple frames will be " Average operation to obtain a new "average brightness characteristic value" AVG total . The aforementioned "average operation" can calculate the average value (x is an integer) of the luminance feature values of the first x frames from the current frame. For example, the equation AVG total = (AVG' total * x - AVG nx + AVG n ) / x is calculated to obtain a new average luminance characteristic value AVG total , where AVG ' total is the original average luminance characteristic value, AVG nx The brightness feature value of the previous xth frame of the current frame. That is, only the "average brightness of the front x frame" AVG nx and the "current frame brightness feature value" AVG n can be calculated, that is, the new "average brightness of the first x frames" AVG total can be calculated. In another embodiment, the "average operation" performed in step S250 may calculate the equation AVG total = [AVG' total *(x-1) + AVG n ] / x to obtain a new average luminance feature value AVG. Total .

在完成步驟S240或S250後，接著執行步驟S260以依據平均亮度特徵值調整背光亮度。在調定背光亮度後，便可以將顯示面板的影像畫面與背光源的調整後背光亮度同步輸出(步驟S270)。After step S240 or S250 is completed, step S260 is next performed to adjust the backlight brightness according to the average brightness characteristic value. After the backlight brightness is set, the image screen of the display panel can be output in synchronization with the adjusted backlight brightness of the backlight (step S270).

圖3是依照本發明實施例說明一種背光亮度控制裝置。請參照圖2與圖3，背光亮度控制裝置包括第一計算單元310、第二計算單元320以及驅動單元330。第一計算單元310接收目前圖框之像素資料Dframe (步驟S210)，以計算目前圖框之亮度特徵值(步驟S220)。此像素資料Dframe 可以由顯像裝置內的時序控制器(未繪示)所提供，或者由時序控制器的前級電路，例如影像調整電路(Image Scalar，未繪示)，來提供像素資料Dframe 給第一計算單元310。前述時序控制器可以透過源極驅動器(未繪示)與閘極驅動器(未繪示)，去驅動顯示面板(未繪示)。藉由 背光源340提供背光亮度，顯示面板可以依據前述時序控制器之控制而顯示影像。FIG. 3 illustrates a backlight brightness control apparatus according to an embodiment of the invention. Referring to FIG. 2 and FIG. 3 , the backlight brightness control device includes a first calculating unit 310 , a second calculating unit 320 , and a driving unit 330 . The first calculating unit 310 receives the pixel data D frame of the current frame (step S210) to calculate the brightness feature value of the current frame (step S220). The pixel data D frame may be provided by a timing controller (not shown) in the developing device, or the pixel data may be provided by a front stage circuit of the timing controller, such as an image conditioning circuit (Image Scalar, not shown). The D frame is given to the first computing unit 310. The timing controller can drive a display panel (not shown) through a source driver (not shown) and a gate driver (not shown). By providing backlight brightness by backlight 340, the display panel can display images according to the control of the aforementioned timing controller.

第二計算單元320耦接至第一計算單元310。第二計算單元320可以儲存先前圖框的亮度特徵值以及第一計算單元310所提供的亮度特徵值(即目前圖框的亮度特徵值)。然後，第二計算單元320比較目前圖框與先前圖框二者之亮度特徵值(步驟S230)。若目前圖框的亮度特徵值AVGn 與先前圖框的亮度特徵值AVGn-1 二者之絕對差值小於閥值k，則將目前圖框與先前的多個圖框之亮度特徵值進行平均運算，以獲得新的平均亮度特徵值AVGtotal (步驟S250)。若| AVGn -AVGn-1 |大於閥值k，則以目前圖框之亮度特徵值AVGn 做為新的平均亮度特徵值AVGtotal (步驟S240)。The second computing unit 320 is coupled to the first computing unit 310. The second calculating unit 320 may store the brightness feature value of the previous frame and the brightness feature value provided by the first calculating unit 310 (ie, the brightness feature value of the current frame). Then, the second calculating unit 320 compares the brightness feature values of both the current frame and the previous frame (step S230). If the current luminance value of the luminance characteristic feature of the frame with the previous frame AVG n value of the absolute difference between the two AVG n-1 is less than the threshold k, then the current frame with the previous frame of the plurality of luminance characteristic values The averaging operation is performed to obtain a new average luminance characteristic value AVG total (step S250). If | AVG n - AVG n -1 | is greater than the threshold k, the luminance feature value AVG n of the current frame is taken as the new average luminance feature value AVG total (step S240).

驅動單元330耦接於第二計算單元320與背光源340之間。驅動單元330可以驅動背光源340而提供背光亮度，並且依據第二計算單元320所輸出之新的平均亮度特徵值AVGtotal 調整背光亮度(步驟S260)。The driving unit 330 is coupled between the second computing unit 320 and the backlight 340. The driving unit 330 may drive the backlight 340 to provide backlight brightness, and adjust the backlight brightness according to the new average brightness characteristic value AVG total output by the second calculating unit 320 (step S260).

於本實施例中，第二計算單元320包括位移暫存單元321、比較單元322以及輸出單元323。位移暫存單元321具有x級暫存器REG1 ~REGx 。位移暫存單元321受控於比較單元322所輸出之比較信號C。若比較信號C為第一邏輯值(例如為邏輯0)，則將該x級暫存器之第一級暫存器REG1 接收第一計算單元310所輸出之目前圖框亮度特徵值AVGn ，並逐級傳遞亮度特徵值。若比較信號C為 第二邏輯值(例如為邏輯1)，則使該x級暫存器之每一級暫存器REG1 ~REGx 同時接收第一計算單元310所輸出之目前圖框亮度特徵值AVGn 。本實施例中更於位移暫存單元321配置暫存器REG0 與多工器MUX0 。依據比較信號C之控制，多工器MUX0 可以使該x級暫存器之第一級暫存器REG1 直接接收第一計算單元310所輸出之目前圖框亮度特徵值AVGn ，或者透過暫存器REG0 接收第一計算單元310所輸出之目前圖框亮度特徵值AVGn 。暫存器REG0 與多工器MUX0 可視需求而省略之，而使第一計算單元310所輸出之目前圖框亮度特徵值AVGn 直接輸出給第一級暫存器REG1 、比較單元322以及輸出單元323。In the embodiment, the second calculating unit 320 includes a displacement temporary storage unit 321, a comparison unit 322, and an output unit 323. The displacement temporary storage unit 321 has x-stage registers REG 1 to REG x . The shift register unit 321 is controlled by the comparison signal C output by the comparison unit 322. If the comparison signal C is the first logic value (for example, logic 0), the first-stage register REG 1 of the x-stage register receives the current frame luminance feature value AVG n output by the first calculation unit 310. And pass the luminance feature values step by step. If the comparison signal C is a second logic value (for example, a logic 1), each stage register REG 1 ~REG x of the x-stage register is simultaneously received the current frame brightness characteristic output by the first calculation unit 310. Value AVG n . In the embodiment, the temporary register REG 0 and the multiplexer MUX 0 are configured in the displacement temporary storage unit 321 . According to the control of the comparison signal C, the multiplexer MUX 0 can directly receive the current frame luminance feature value AVG n output by the first calculation unit 310, or pass through the first-stage register REG 1 of the x-stage register. The register REG 0 receives the current frame luminance feature value AVG n output by the first calculating unit 310. The register REG 0 and the multiplexer MUX 0 are omitted as needed, and the current frame brightness feature value AVG n output by the first calculating unit 310 is directly output to the first stage register REG 1 and the comparison unit 322. And an output unit 323.

比較單元322耦接至位移暫存單元321，用以接收並計算目前圖框之亮度特徵值AVGn 與先前圖框的亮度特徵值AVGn-1 二者之絕對差值。若所述絕對差值| AVGn -AVGn-1 |小於閥值k，則輸出第一邏輯值做為比較信號C。若所述絕對差值| AVGn -AVGn-1 |大於該閥值k，則輸出第二邏輯值做為比較信號C。如上所述，比較單元322所輸出之比較信號C可以控制位移暫存單元321。The comparison unit 322 is coupled to the displacement temporary storage unit 321 for receiving and calculating the absolute difference between the luminance feature value AVG n of the current frame and the luminance feature value AVG n-1 of the previous frame. If the absolute difference | AVG n -AVG n-1 | is smaller than the threshold k, the first logical value is output as the comparison signal C. If the absolute difference | AVG n -AVG n-1 | is greater than the threshold k, the second logic value is output as the comparison signal C. As described above, the comparison signal C output by the comparison unit 322 can control the displacement temporary storage unit 321.

輸出單元323耦接至位移暫存單元321與比較單元322。若比較信號C為第一邏輯值，則將該x級暫存器之最後一級暫存器REGx 之輸出AVGn-x 與目前圖框之亮度特徵值AVGn 進行平均運算，在此為AVGtotal =(AVG’total *x-AVGn-x +AVGn )/x之計算，以輸出新的平均亮度特徵值AVGtotal 。若比較信號C為第二邏輯值，則以目前圖框之 亮度特徵值AVGn 做為新的平均亮度特徵值AVGtotal ，亦即AVGtotal =AVGn 。The output unit 323 is coupled to the displacement temporary storage unit 321 and the comparison unit 322. If the comparison signal C is the first logic value, the output AVG nx of the last-stage register REG x of the x-stage register is averaged with the luminance feature value AVG n of the current frame, where AVG total = (AVG' total *x-AVG nx +AVG n )/x is calculated to output a new average luminance feature value AVG total . If the comparison signal C is the second logic value, the luminance feature value AVG n of the current frame is used as the new average luminance feature value AVG total , that is, AVG total = AVG n .

於本實施例中，上述位移暫存單元321包括x個暫存器REG1 ~REGx 以及x-1個多工器MUX2 ~MUXx 。該x級暫存器之最後一級暫存器REGx 之輸出端耦接至輸出單元323。第i個多工器MUXi 之輸出端耦接至第i級暫存器REGi 之輸入端。第i個多工器MUXi 之第一輸入端耦接至第i-1級暫存器REGi-1 之輸出端。上述i為整數，且0<i<x+1。每一個多工器MUX1 ~MUXx 之第二輸入端均耦接至第一計算單元310，以接收目前圖框之亮度特徵值AVGn 。另外，每一個多工器MUX1 ~MUXx 均受控於比較信號C。In the embodiment, the displacement temporary storage unit 321 includes x temporary registers REG 1 to REG x and x-1 multiplexers MUX 2 to MUX x . The output of the last stage register REG x of the x-stage register is coupled to the output unit 323. The output of the i-th multiplexer MUX i is coupled to the input of the i-th register REG i . The first input end of the i-th multiplexer MUX i is coupled to the output end of the i- 1th stage register REG i-1 . The above i is an integer and 0 < i < x + 1. The second input end of each of the multiplexers MUX 1 to MUX x is coupled to the first computing unit 310 to receive the brightness feature value AVG n of the current frame. In addition, each of the multiplexers MUX 1 to MUX x is controlled by the comparison signal C.

於本實施例中，上述比較單元322包括減法器324以及比較器325。減法器324耦接至位移暫存單元321以接收目前圖框之亮度特徵值AVGn 與先前圖框的亮度特徵值AVGn-1 ，並計算二者之絕對差值(| AVGn -AVGn-1 |)。比較器325耦接至減法器324。比較器325比較所述絕對差值| AVGn -AVGn-1 |與閥值k，並依據比較結果輸出比較信號C給輸出單元323以及多工器MUX1 ~MUXx 。In the embodiment, the comparison unit 322 includes a subtractor 324 and a comparator 325. The subtracter 324 is coupled to the displacement temporary storage unit 321 to receive the luminance feature value AVG n of the current frame and the luminance feature value AVG n-1 of the previous frame, and calculate the absolute difference between the two (| AVG n -AVG n -1 |). Comparator 325 is coupled to subtractor 324. The comparator 325 compares the absolute difference value | AVG n - AVG n -1 | with the threshold value k, and outputs a comparison signal C to the output unit 323 and the multiplexers MUX 1 to MUX x according to the comparison result.

圖4是依照本發明實施例說明顯示面板之灰階亮度對應於背光亮度的圖框時序圖。如圖4所示，其橫軸表示時間。圖4中上列(row)各個方塊表示顯示面板之灰階亮度隨著時間而變化。圖4中下列各個方塊表示背光源340之背光亮度對應於顯示面板之灰階亮度(即目前圖框之像 素資料)而變化。如圖4所示，在時間範圍T1中，顯示面板的灰階亮度變化是緩慢的。也就是說，在時間範圍T1中| AVGn -AVGn-1 |都小於閥值k(閥值k例如是160)，因此比較單元322輸出邏輯0，以表示顯示面板的灰階亮度變化是緩慢的。因此，輸出單元323在時間範圍T1中是將該x級暫存器之最後一級暫存器REGx 之輸出AVGn-x 與目前圖框之亮度特徵值AVGn 進行平均運算(在此為AVGtotal =(AVG’total *x-AVGn-x +AVGn )/x之計算，以輸出新的平均亮度特徵值AVGtotal )，所以背光源340會對應於顯示面板的灰階亮度變化而由亮漸漸變暗。4 is a timing diagram of a frame illustrating grayscale brightness of a display panel corresponding to backlight brightness, in accordance with an embodiment of the invention. As shown in Fig. 4, the horizontal axis represents time. The upper squares of the upper row in Figure 4 indicate that the grayscale brightness of the display panel changes over time. The following squares in FIG. 4 indicate that the backlight brightness of the backlight 340 varies corresponding to the grayscale brightness of the display panel (ie, the pixel data of the current frame). As shown in FIG. 4, in the time range T1, the grayscale luminance change of the display panel is slow. That is, in the time range T1 | AVG n - AVG n -1 | are both smaller than the threshold k (the threshold k is, for example, 160), so the comparison unit 322 outputs a logic 0 to indicate that the gray scale luminance change of the display panel is slowly. Therefore, in the time range T1, the output unit 323 averages the output AVG nx of the last-stage register REG x of the x-stage register with the luminance feature value AVG n of the current frame (here, AVG total = (AVG' total *x-AVG nx +AVG n )/x is calculated to output a new average luminance feature value AVG total ), so the backlight 340 will be darker and darker corresponding to the grayscale luminance change of the display panel .

對於灰階亮度變化較快的影片，或者當輸入影像為由暗立刻變亮的畫面時，如圖4中顯示面板所顯示的影像在第n-1個圖框為暗畫面(亮度為1nits)，但在第n個圖框卻突然由暗畫面跳成亮畫面(亮度為300nits)，因此在第n個圖框的時間中|AVGn -AVGn-1 |大於閥值k，所以比較單元322輸出邏輯1做為比較信號C，以表示顯示面板的灰階亮度變化很大。受控於比較信號C，輸出單元323在第n個圖框的時間中是以目前圖框之亮度特徵值AVGn 做為新的平均亮度特徵值AVGtotal 。同時，位移暫存單元321亦受控於比較信號C，而將暫存器REG1 ~REGx 之儲存內容均重置為目前圖框之亮度特徵值AVGn 。For a movie whose gray level brightness changes rapidly, or when the input image is a picture that is brightened by dark, the image displayed on the display panel in FIG. 4 is a dark picture in the n-1th frame (the brightness is 1 nits). However, in the nth frame, it suddenly jumps from a dark picture to a bright picture (brightness is 300nits), so in the time of the nth frame |AVG n -AVG n-1 | is greater than the threshold k, so the comparison unit The 322 output logic 1 is used as the comparison signal C to indicate that the gray scale brightness of the display panel varies greatly. Controlled by the comparison signal C, the output unit 323 uses the luminance feature value AVG n of the current frame as the new average luminance feature value AVG total in the time of the nth frame. At the same time, the displacement temporary storage unit 321 is also controlled by the comparison signal C, and resets the storage contents of the temporary registers REG 1 ~ REG x to the brightness characteristic value AVG n of the current frame.

綜上所述，上述實施例因為比較目前圖框與先前圖框二者之亮度特徵值，因此可以隨時判斷畫面有無明確的亮度變化。若畫面的亮度變化並沒有很明確，則將先前多個 圖框的亮度特徵值AVGn-x+1 ~AVGn 進行平均運算，以獲得新的平均亮度特徵值AVGtotal 。反之，若畫面的亮度變化很明確，則以目前圖框之亮度特徵值AVGn 做為新的平均亮度特徵值AVGtotal 。因此，當影片(畫面)有明確的亮度變化時(例如圖4由第n-1個圖框的亮度1nits突然變為第n個圖框的亮度300nits)，背光亮度可以即時地跟隨畫面亮度而反應。亦即，若目前圖框的亮度與先前圖框的亮度異差過大，即立刻修正平均亮度特徵值，使背光亮度與顯示面板的灰階亮度能立刻顯示最適合的亮度輸出，而解決了傳統動態背光技術造成亮度不自然的問題。In summary, in the above embodiment, since the brightness feature values of both the current frame and the previous frame are compared, it is possible to determine whether the picture has a clear brightness change at any time. If the brightness change of the picture is not clear, the brightness feature values AVG n-x+1 ~AVG n of the previous plurality of frames are averaged to obtain a new average brightness feature value AVG total . On the other hand, if the brightness change of the picture is clear, the brightness feature value AVG n of the current frame is used as the new average brightness feature value AVG total . Therefore, when the film (picture) has a clear brightness change (for example, the brightness of the n-1th frame suddenly changes to the nnit frame of 300 nits in FIG. 4), the backlight brightness can immediately follow the picture brightness. reaction. That is, if the brightness of the current frame is too different from the brightness of the previous frame, the average brightness characteristic value is corrected immediately, so that the brightness of the backlight and the gray level brightness of the display panel can immediately display the most suitable brightness output, thereby solving the traditional Dynamic backlighting causes problems with unnatural brightness.

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內，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。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.

310‧‧‧第一計算單元310‧‧‧First calculation unit

320‧‧‧第二計算單元320‧‧‧Second calculation unit

321‧‧‧位移暫存單元321‧‧‧Displacement unit

322‧‧‧比較單元322‧‧‧Comparative unit

323‧‧‧輸出單元323‧‧‧Output unit

324‧‧‧減法器324‧‧‧Subtractor

325‧‧‧比較器325‧‧‧ comparator

330‧‧‧驅動單元330‧‧‧ drive unit

340‧‧‧背光源340‧‧‧ Backlight

C‧‧‧比較信號C‧‧‧Comparative signal

Dframe ‧‧‧目前圖框之像素資料D frame ‧‧‧Pixel data of the current frame

MUX1 ~MUXx ‧‧‧多工器MUX 1 ~MUX x ‧‧‧Multiplexer

REG0 ~REGx ‧‧‧暫存器REG 0 ~REG x ‧‧‧ register

S210~S270‧‧‧依照本發明實施例說明背光亮度控制方法的各步驟S210~S270‧‧‧ steps of the backlight brightness control method according to an embodiment of the invention

T1‧‧‧時間範圍T1‧‧‧ time range

圖1是說明傳統動態背光技術對應於顯示面板之亮度而動態調整背光亮度的圖框時序圖。1 is a timing diagram illustrating a frame in which a conventional dynamic backlight technology dynamically adjusts backlight brightness in accordance with brightness of a display panel.

圖2是依照本發明實施例說明一種背光亮度控制方法的流程圖。FIG. 2 is a flow chart illustrating a backlight brightness control method according to an embodiment of the invention.

圖3是依照本發明實施例說明一種背光亮度控制裝置。FIG. 3 illustrates a backlight brightness control apparatus according to an embodiment of the invention.

圖4是依照本發明實施例說明顯示面板之灰階亮度對應於背光亮度的圖框時序圖。4 is a timing diagram of a frame illustrating grayscale brightness of a display panel corresponding to backlight brightness, in accordance with an embodiment of the invention.

S210~S270‧‧‧依照本發明實施例說明背光亮度控制方法的各步驟S210~S270‧‧‧ steps of the backlight brightness control method according to an embodiment of the invention

Claims (15)

一種背光亮度控制方法，包括：計算該目前圖框中部分像素的亮度值；計算該些亮度值之平均值，以做為該目前圖框之亮度特徵值；比較該目前圖框與一先前圖框二者之亮度特徵值；若該目前圖框的亮度特徵值與該先前圖框的亮度特徵值二者之絕對差值小於一閥值，則將該目前圖框與其先前的多個圖框之亮度特徵值進行一平均運算，以獲得一平均亮度特徵值；若該目前圖框的亮度特徵值與該先前圖框的亮度特徵值二者之絕對差值大於該閥值，則以該目前圖框之亮度特徵值做為該平均亮度特徵值；以及依據該平均亮度特徵值，調整一背光亮度。 A backlight brightness control method includes: calculating a brightness value of a part of pixels in the current frame; calculating an average value of the brightness values as a brightness feature value of the current frame; comparing the current frame with a previous picture a brightness characteristic value of both frames; if the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is less than a threshold, the current frame and the previous plurality of frames are Performing an averaging operation on the brightness feature value to obtain an average brightness feature value; if the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is greater than the threshold, then the current The brightness characteristic value of the frame is taken as the average brightness characteristic value; and a backlight brightness is adjusted according to the average brightness characteristic value. 如申請專利範圍第1項所述之背光亮度控制方法，其中該先前圖框於時序上與該目前圖框相鄰。 The backlight brightness control method of claim 1, wherein the previous frame is temporally adjacent to the current frame. 如申請專利範圍第1項所述之背光亮度控制方法，其中該閥值介於50至250之間。 The backlight brightness control method of claim 1, wherein the threshold is between 50 and 250. 如申請專利範圍第3項所述之背光亮度控制方法，其中該閥值為160。 The backlight brightness control method of claim 3, wherein the threshold value is 160. 如申請專利範圍第1項所述之背光亮度控制方法，其中該平均運算為計算等式AVGtotal =(AVG’total *x-AVGn-x +AVGn )/x，其中AVGtotal 為新的該平均亮度特徵值，AVG’total 為原來的該平均亮度特徵值，AVGn 為該目 前圖框之亮度特徵值，AVGn-x 為該目前圖框之先前第x個圖框的亮度特徵值，而x為整數。The backlight brightness control method according to claim 1, wherein the averaging operation is a calculation equation AVG total = (AVG' total * x - AVG nx + AVG n ) / x, wherein AVG total is a new average brightness characteristic value, AVG 'total original value of the average luminance characteristics, AVG n frame for the current luminance value of the characteristic, AVG nx previously for the luminance of the current frame feature values of x-th frame, and x is Integer. 如申請專利範圍第1項所述之背光亮度控制方法，其中該平均運算為計算等式AVGtotal =[AVG’total *(x-1)+AVGn ]/x，其中AVGtotal 為新的該平均亮度特徵值，AVG’total 為原來的該平均亮度特徵值，AVGn 為該目前圖框之亮度特徵值，而x為整數。The backlight brightness control method according to claim 1, wherein the averaging operation is a calculation equation AVG total = [AVG' total * (x-1) + AVG n ] / x, wherein AVG total is new wherein the average luminance value, AVG 'total original value of the average luminance characteristics, AVG n frame for the current luminance value of the characteristic, and x is an integer. 一種背光亮度控制裝置，包括：一第一計算單元，用以接收一目前圖框之像素資料，依據該目前圖框中像素資料去計算部分像素的亮度值；以及計算該些亮度值之平均值，以做為該目前圖框之亮度特徵值；一第二計算單元，耦接至該第一計算單元，用以比較該目前圖框與一先前圖框二者之亮度特徵值；若該目前圖框的亮度特徵值與該先前圖框的亮度特徵值二者之絕對差值小於一閥值，則將該目前圖框與其先前的多個圖框之亮度特徵值進行一平均運算，以獲得一平均亮度特徵值；若該目前圖框的亮度特徵值與該先前圖框的亮度特徵值二者之絕對差值大於該閥值，則以該目前圖框之亮度特徵值做為該平均亮度特徵值；以及一驅動單元，耦接於該第二計算單元與一背光源之間，用以驅動該背光源以提供一背光亮度，並且依據該平均亮度特徵值調整該背光亮度。 A backlight brightness control device includes: a first calculating unit, configured to receive pixel data of a current frame, calculate a brightness value of a part of the pixels according to the pixel data in the current frame; and calculate an average value of the brightness values And as a brightness feature value of the current frame; a second calculation unit coupled to the first calculation unit, for comparing brightness characteristic values of the current frame and a previous frame; If the absolute difference between the brightness feature value of the frame and the brightness feature value of the previous frame is less than a threshold, the current frame is averaged with the brightness feature values of the previous plurality of frames to obtain an average operation. An average brightness characteristic value; if the absolute difference between the brightness feature value of the current frame and the brightness feature value of the previous frame is greater than the threshold, the brightness feature value of the current frame is used as the average brightness And a driving unit coupled between the second computing unit and a backlight for driving the backlight to provide a backlight brightness, and adjusting the backlight according to the average brightness characteristic value Degree. 如申請專利範圍第7項所述之背光亮度控制裝置，其中該先前圖框於時序上與該目前圖框相鄰。 The backlight brightness control device of claim 7, wherein the previous frame is temporally adjacent to the current frame. 如申請專利範圍第7項所述之背光亮度控制裝置，其中該閥值介於50至250之間。 The backlight brightness control device of claim 7, wherein the threshold value is between 50 and 250. 如申請專利範圍第9項所述之背光亮度控制裝置，其中該閥值為160。 The backlight brightness control device of claim 9, wherein the threshold value is 160. 如申請專利範圍第7項所述之背光亮度控制裝置，其中該平均運算為計算等式AVGtotal =(AVG’total *x-AVGn-x +AVGn )/x，其中AVGtotal 為新的該平均亮度特徵值，AVG’total 為原來的該平均亮度特徵值，AVGn 為該目前圖框之亮度特徵值，AVGn-x 為該目前圖框之先前第x個圖框的亮度特徵值，而x為整數。The backlight brightness control device of claim 7, wherein the average operation is a calculation equation AVG total = (AVG' total * x - AVG nx + AVG n ) / x, wherein AVG total is a new average brightness characteristic value, AVG 'total original value of the average luminance characteristics, AVG n frame for the current luminance value of the characteristic, AVG nx previously for the luminance of the current frame feature values of x-th frame, and x is Integer. 如申請專利範圍第7項所述之背光亮度控制裝置，其中該平均運算為計算等式AVGtotal =[AVG’total *(x-1)+AVGn ]/x，其中AVGtotal 為新的該平均亮度特徵值，AVG’total 為原來的該平均亮度特徵值，AVGn 為該目前圖框之亮度特徵值，而x為整數。The backlight brightness control device according to claim 7, wherein the averaging operation is a calculation equation AVG total = [AVG' total * (x-1) + AVG n ] / x, wherein AVG total is new wherein the average luminance value, AVG 'total original value of the average luminance characteristics, AVG n frame for the current luminance value of the characteristic, and x is an integer. 如申請專利範圍第7項所述之背光亮度控制裝置，其中該第二計算單元包括：一位移暫存單元，具有x級暫存器，其中若一比較信號為第一邏輯值，則將該x級暫存器之第一級暫存器接收該目前圖框之亮度特徵值，並逐級傳遞亮度特徵值；若該比較信號為第二邏輯值，則使該x級暫存器之每一級暫存器接收該目前圖框之亮度特徵值，其中x為整數； 一比較單元，耦接至該位移暫存單元，用以接收並計算該目前圖框之亮度特徵值與該先前圖框的亮度特徵值二者之絕對差值，若所述絕對差值小於該閥值，則輸出該比較信號為第一邏輯值；若所述絕對差值大於該閥值，則輸出該比較信號為第二邏輯值；以及一輸出單元，耦接至該位移暫存單元與該比較單元，其中若該比較信號為第一邏輯值，則將該x級暫存器之最後一級暫存器之輸出與該目前圖框之亮度特徵值進行AVGtotal =(AVG’total *x-AVGn-x +AVGn )/x之計算，以輸出新的該平均亮度特徵值AVGtotal ，其中AVG’total 為原來的該平均亮度特徵值，AVGn 為該目前圖框之亮度特徵值，AVGn-x 為該x級暫存器之最後一級暫存器之輸出；若該比較信號為第二邏輯值，則以該目前圖框之亮度特徵值做為該平均亮度特徵值。The backlight brightness control device of claim 7, wherein the second calculating unit comprises: a displacement temporary storage unit having an x-stage register, wherein if the comparison signal is the first logic value, The first stage register of the x-stage register receives the brightness feature value of the current frame, and transmits the brightness feature value step by step; if the comparison signal is the second logic value, the x stage register is made The first stage register receives the brightness feature value of the current frame, where x is an integer; a comparison unit is coupled to the displacement temporary storage unit for receiving and calculating the brightness feature value of the current frame and the previous frame The absolute difference between the brightness characteristic values, if the absolute difference is less than the threshold, the comparison signal is output as a first logic value; if the absolute difference is greater than the threshold, the comparison signal is output as a second logic value; and an output unit coupled to the displacement temporary storage unit and the comparison unit, wherein if the comparison signal is the first logic value, the output of the last stage register of the x-stage register With the brightness feature value of the current frame OK AVG total = (AVG 'total * x-AVG nx + AVG n) / x of the calculation to the output of the new the average luminance characteristic value AVG total, wherein AVG' total original the average luminance characteristic value, AVG n is The brightness characteristic value of the current frame, AVG nx is the output of the last stage register of the x-stage register; if the comparison signal is the second logic value, the brightness characteristic value of the current frame is used as the Average brightness characteristic value. 如申請專利範圍第13項所述之背光亮度控制裝置，其中該位移暫存單元包括：x個暫存器REGi ，其中REGi 表示該x級暫存器之第i級暫存器，i為整數且0<i<x+1，而該x級暫存器之最後一級暫存器REGx 之輸出端耦接至該輸出單元；以及x-1個多工器MUXi ，其中第i個多工器MUXi 之輸出端耦接至第i級暫存器REGi 之輸入端，第i個多工器MUXi 之第一輸入端耦接至第i-1級暫存器REGi-1 之輸出端，第i個多工器MUXi 之第二輸入端接收該目前圖框之亮度特徵值，而每一個多工器受控於該比較信號。The backlight brightness control device of claim 13, wherein the displacement temporary storage unit comprises: x temporary registers REG i , wherein REG i represents an i-th stage register of the x-stage register, i Is an integer and 0<i<x+1, and the output of the last stage register REG x of the x-stage register is coupled to the output unit; and x-1 multiplexers MUX i , where i The output end of the multiplexer MUX i is coupled to the input end of the i-th stage register REG i , and the first input end of the i-th multiplexer MUX i is coupled to the i-1th stage register REG i At the output of -1 , the second input of the i-th multiplexer MUX i receives the luminance feature value of the current frame, and each multiplexer is controlled by the comparison signal. 如申請專利範圍第13項所述之背光亮度控制裝置，其中該比較單元包括：一減法器，耦接至該位移暫存單元以接收該目前圖框之亮度特徵值與該先前圖框的亮度特徵值，並計算二者之絕對差值；以及一比較器，耦接至該減法器，用以比較所述絕對差值與該閥值，並依據比較結果輸出該比較信號。 The backlight brightness control device of claim 13, wherein the comparison unit comprises: a subtractor coupled to the displacement temporary storage unit to receive the brightness characteristic value of the current frame and the brightness of the previous frame. And an absolute value of the difference; and a comparator coupled to the subtractor for comparing the absolute difference with the threshold, and outputting the comparison signal according to the comparison result.
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