TWI433123B - Image display apparatus, driving system and driving method thereof - Google Patents
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本發明是有關於一種影像顯示補償架構，且特別是有關於一種調整背光亮度以補償閃爍效應的驅動系統與其方法，其適用於影像顯示裝置中。 The present invention relates to an image display compensation architecture, and more particularly to a drive system and method for adjusting backlight brightness to compensate for flicker effects, which is suitable for use in an image display device.
液晶顯示器(LCD)具有低幅射、低耗量等優點，已逐漸成為顯示器的主流。然而，因為液晶的特性，當使用者正看或側看液晶顯示器時，使用者所看到的顯示亮度有所不同。第1A圖顯示正看與側看的灰階值-亮度曲線圖(亦可稱為珈瑪曲線)。如第1A圖所示，側看的珈瑪曲線有往上漂移的現象。故而，當使用者在側看影像時，會出現洗白(wash out)與色偏(color shift)現象。 Liquid crystal displays (LCDs) have the advantages of low radiation and low consumption, and have gradually become the mainstream of displays. However, due to the characteristics of the liquid crystal, the brightness of the display seen by the user is different when the user is looking at or looking at the liquid crystal display. Figure 1A shows the grayscale value-luminance plot (also known as the gamma curve) looking at and looking at the side. As shown in Fig. 1A, the side-viewing gamma curve has a phenomenon of drifting upward. Therefore, when the user views the image on the side, there is a phenomenon of wash out and color shift.
為解決此問題，習知技術將一個畫框(frame)分解成兩個子畫框(sub frame)。第1B圖顯示習知技術的灰階值、背光亮度與顯示亮度的曲線圖，其橫軸代表時間t。Gray_T代表畫框的灰階值，Gray_L與Gray_H代表子畫框的灰階值。 To solve this problem, the prior art decomposes a frame into two sub frames. Fig. 1B is a graph showing gray scale values, backlight luminance, and display luminance of the prior art, and the horizontal axis represents time t. Gray_T represents the grayscale value of the frame, and Gray_L and Gray_H represent the grayscale values of the sub-frame.
如第1B圖所示，如果畫框的顯示頻率是60hz，則子畫框SB1與SB2的顯示頻率為120hz。如此，子畫框SB1或SB2會有60hz的閃爍(flicker)，如第1B圖的FL所示。此60hz的閃爍將會被人眼所察覺。 As shown in FIG. 1B, if the display frequency of the picture frame is 60hz, the display frequency of the sub-picture frames SB1 and SB2 is 120hz. Thus, the sub-frame SB1 or SB2 will have a flicker of 60hz, as shown by FL of FIG. 1B. This 60hz flash will be noticed by the human eye.
目前已知有兩種做法可減少閃爍。第一種做法是提高子畫框的頻率，然而發明人發現，此種做法將提高液晶顯示器的功率消耗。第二種做法則是減少第1B圖中的灰階 值Gray_H與Gray_L間的差異，然而，發明人發現，第二種做法會降低對於色偏的補償效果。 There are two known practices to reduce flicker. The first approach is to increase the frequency of the sub-frames, however the inventors have found that this approach will increase the power consumption of the liquid crystal display. The second method is to reduce the gray scale in Figure 1B. The difference between the values Gray_H and Gray_L, however, the inventors found that the second approach would reduce the compensation effect for color cast.
故而，本案提出一種補償技術，其利用調整背光亮度，以降低閃爍，以有效解決使用者在側看影像時所產生的色偏現象。 Therefore, the present invention proposes a compensation technique, which utilizes adjusting the brightness of the backlight to reduce flicker, so as to effectively solve the color shift phenomenon generated when the user views the image from the side.
本發明提出一種補償技術與LCD驅動技術，當顯示高灰階值子畫框時，調低背光亮度；反之，當顯示低灰階值子畫框時，調高背光亮度。如此，可以降低閃爍，以有效解決使用者在側看影像時所產生的色偏現象。 The invention provides a compensation technology and an LCD driving technology. When displaying a high grayscale value sub-frame, the backlight brightness is lowered; otherwise, when the low gray value sub-frame is displayed, the backlight brightness is increased. In this way, the flicker can be reduced to effectively solve the color shift phenomenon generated when the user views the image from the side.
本發明提出一種補償技術與LCD驅動技術，其對背光亮度進行補償與最佳化，以改善側看的珈瑪曲線。 The invention provides a compensation technique and an LCD driving technology, which compensates and optimizes the backlight brightness to improve the side view gamma curve.
本發明的一例有關於一種驅動系統，用於驅動影像顯示系統的背光源與顯示面板。此驅動系統包括：畫面屬性分析單元，接收並統計畫框的灰階值分布情形，以得到畫框的代表性灰階值；背光亮度產生單元，根據畫框的該代表性灰階值以得到第一與第二子畫框背光亮度值，第一子畫框背光亮度值大於第二子畫框背光亮度值；背光驅動電路，根據第一與第二子畫框背光亮度值以驅動背光源；子畫框灰階值產生單元，接收該畫框以產生一第一子畫框灰階值與一第二子畫框灰階值，該第一子畫框灰階值對應至該畫框之一第一子畫框，該第二子畫框灰階值對應至該畫框之一第二子畫框，其中，第一子畫框灰階值小於第二子畫框灰階值；以及面板驅動模組，根據第一與第二子畫框灰階值而驅動顯示面板。於顯示第一子畫框時，背光驅動 電路以第一子畫框背光亮度值驅動背光源，面板驅動模組以第一子畫框灰階值驅動顯示面板。於顯示第二子畫框時，背光驅動電路以第二子畫框背光亮度值驅動背光源，面板驅動模組以第二子畫框灰階值驅動顯示面板。 An example of the invention relates to a drive system for driving a backlight and a display panel of an image display system. The driving system comprises: a picture attribute analyzing unit, which receives and counts the gray scale value distribution of the picture frame to obtain a representative gray level value of the picture frame; the backlight brightness generating unit obtains the representative gray level value according to the picture frame First and second sub-frame backlight brightness values, the first sub-frame backlight brightness value is greater than the second sub-frame backlight brightness value; the backlight driving circuit drives the backlight according to the first and second sub-frame backlight brightness values a sub-picture grayscale value generating unit receives the frame to generate a first sub-frame grayscale value and a second sub-frame grayscale value, wherein the first sub-frame grayscale value corresponds to the frame a first sub-frame, the second sub-frame grayscale value corresponding to the second sub-frame of the frame, wherein the first sub-frame grayscale value is smaller than the second sub-frame grayscale value; And a panel driving module, driving the display panel according to the first and second sub-frame grayscale values. Backlight drive when displaying the first sub frame The circuit drives the backlight with the brightness value of the first sub-frame backlight, and the panel driving module drives the display panel with the gray value of the first sub-frame. When the second sub-frame is displayed, the backlight driving circuit drives the backlight with the second sub-frame backlight brightness value, and the panel driving module drives the display panel with the second sub-frame gray level value.
本發明的另一例有關於一種驅動方法，用於驅動影像顯示系統的背光源與顯示面板。此驅動方法包括：(a)接收並統計畫框的灰階值分布情形，以得到畫框的代表性灰階值；(b)接收該畫框以產生一第一子畫框灰階值與一第二子畫框灰階值，該第一子畫框灰階值對應至該畫框之一第一子畫框，該第二子畫框灰階值對應至該畫框之一第二子畫框，其中，第一子畫框灰階值小於第二子畫框灰階值；(c)根據畫框的代表性灰階值，得到第一與第二子畫框背光亮度值，其中第一子畫框背光亮度值大於第二子畫框背光亮度值；(d)於顯示第一子畫框時，以第一子畫框背光亮度值驅動背光源，以第一子畫框灰階值驅動顯示面板；以及(e)於顯示第二子畫框時，以第二子畫框背光亮度值驅動背光源，以第二子畫框灰階值驅動顯示面板。 Another example of the present invention relates to a driving method for driving a backlight and a display panel of an image display system. The driving method includes: (a) receiving and counting a grayscale value distribution of the frame to obtain a representative grayscale value of the frame; and (b) receiving the frame to generate a first subframe grayscale value and a second sub-frame grayscale value, the first sub-frame grayscale value corresponding to one of the first sub-frames of the frame, the second sub-frame grayscale value corresponding to one of the frame a sub-frame, wherein the first sub-frame grayscale value is smaller than the second sub-frame grayscale value; (c) obtaining the first and second sub-frame backlight brightness values according to the representative grayscale value of the frame, The backlight brightness value of the first sub-frame is greater than the backlight brightness value of the second sub-frame; (d) when the first sub-frame is displayed, the backlight is driven by the brightness value of the first sub-frame backlight, and the first sub-frame is used. The grayscale value drives the display panel; and (e) when the second sub-frame is displayed, the backlight is driven by the second sub-frame backlight brightness value, and the display panel is driven by the second sub-frame grayscale value.
本發明的又另一例有關於一種影像顯示裝置，包括：背光源；顯示面板；畫面屬性分析單元，接收並統計畫框的灰階值分布情形，以得到畫框的代表性灰階值；背光亮度產生單元，根據畫框的代表性灰階值以得到第一與第二子畫框背光亮度值，其中第一子畫框背光亮度值大於第二子畫框背光亮度值；背光驅動電路，根據第一與第二子畫框背光亮度值以驅動背光源；子畫框灰階值產生單元，接收畫框以產生一第一子畫框灰階值與一第二子畫框灰階 值，該第一子畫框灰階值對應至該畫框之一第一子畫框，該第二子畫框灰階值對應至該畫框之一第二子畫框，其中，第一子畫框灰階值小於第二子畫框灰階值；以及面板驅動模組，根據第一與第二子畫框灰階值而驅動顯示面板。於顯示第一子畫框時，背光驅動電路以第一子畫框背光亮度值驅動背光源，面板驅動模組以第一子畫框灰階值驅動顯示面板。於顯示第二子畫框時，背光驅動電路以第二子畫框背光亮度值驅動背光源，面板驅動模組以第二子畫框灰階值驅動顯示面板。 Still another example of the present invention relates to an image display device, including: a backlight; a display panel; a screen attribute analysis unit that receives and counts a grayscale value distribution of the frame to obtain a representative grayscale value of the frame; The brightness generating unit obtains the first and second sub-frame backlight brightness values according to the representative gray scale value of the picture frame, wherein the first sub-picture frame backlight brightness value is greater than the second sub-picture frame backlight brightness value; the backlight driving circuit, And driving the backlight according to the first and second sub-frame backlight brightness values; the sub-picture gray scale value generating unit receives the picture frame to generate a first sub-picture gray scale value and a second sub-frame gray scale a first sub-frame grayscale value corresponding to one of the first sub-frames of the frame, the second sub-frame grayscale value corresponding to one of the second sub-frames of the frame, wherein the first The sub-picture frame grayscale value is smaller than the second sub-frame grayscale value; and the panel driving module drives the display panel according to the first and second sub-frame grayscale values. When the first sub-frame is displayed, the backlight driving circuit drives the backlight with the brightness value of the first sub-frame backlight, and the panel driving module drives the display panel with the gray value of the first sub-frame. When the second sub-frame is displayed, the backlight driving circuit drives the backlight with the second sub-frame backlight brightness value, and the panel driving module drives the display panel with the second sub-frame gray level value.
為讓本發明之上述內容能更明顯易懂，下文特舉實施例，並配合所附圖式，作詳細說明如下： In order to make the above-mentioned contents of the present invention more comprehensible, the following specific embodiments, together with the drawings, are described in detail below:
本發明實施例提出一種補償技術與LCD驅動技術法，當顯示具高灰階值的子畫框時，調低背光亮度；反之，當顯示具低灰階值的子畫框時，調高背光亮度。如此，可以降低閃爍，以有效解決使用者在側看影像時所產生的色偏現象。 The embodiment of the invention provides a compensation technology and an LCD driving technology method. When displaying a sub-picture frame with a high gray level value, the backlight brightness is lowered; otherwise, when displaying a sub-picture frame with a low gray level value, the backlight is turned up. brightness. In this way, the flicker can be reduced to effectively solve the color shift phenomenon generated when the user views the image from the side.
第2A圖顯示根據本發明一實施例的影像顯示裝置的方塊示意圖。如第2A圖所示，此影像顯示裝置200至少包括：灰階值統計單元202、選擇單元204、背光亮度查表單元206、背光亮度暫存器208、時間多工器210、背光驅動電路212、背光模組214、灰階值查表單元222與224、暫存器226與228、時間多工器230、時序控制器232、閘極驅動電路234、源極驅動電路236與顯示面板238。影像顯示裝置200比如但不受限於LCD。Gray_T(n) 代表所接收到的第n個畫框資料的灰階值，n為正整數。 2A is a block diagram showing an image display device according to an embodiment of the invention. As shown in FIG. 2A, the image display device 200 includes at least: a grayscale value counting unit 202, a selecting unit 204, a backlight brightness lookup unit 206, a backlight brightness register 208, a time multiplexer 210, and a backlight driving circuit 212. The backlight module 214, the gray scale value lookup table units 222 and 224, the temporary registers 226 and 228, the time multiplexer 230, the timing controller 232, the gate drive circuit 234, the source drive circuit 236 and the display panel 238. The image display device 200 is, for example but not limited to, an LCD. Gray_T(n) Represents the grayscale value of the nth frame data received, n is a positive integer.
在本實施例中，依照背光模組214的背光源的形狀、位置與致能時序，將背光模組214內的背光源分成4區B1~B4(假設背光源為直條式，且其驅動方式為掃描式驅動)。依此，畫框資料Gray_T(n)分成4區A1~A4；顯示面板238的所有畫素列R1~R100分成4區C1~C4，畫素列R1~R25屬於分區C1，其餘可依此類推。在底下說明中，假設背光源分區B1中的背光源位於分區C1的中央畫素列R12的正下方。故而，在底下說明中，背光亮度的最佳化乃是針對畫素列R12。當然也可以分成更多區，例如3×3共九區。習知此技者當知本發明並不受限於此，背光亮度的最佳化亦可針對其他位置的畫素列。 In this embodiment, the backlight in the backlight module 214 is divided into four regions B1 to B4 according to the shape, position and enabling timing of the backlight of the backlight module 214 (assuming that the backlight is a straight strip and driven) The way is scanning drive). Accordingly, the frame data Gray_T(n) is divided into four areas A1~A4; all the pixel columns R1~R100 of the display panel 238 are divided into four areas C1~C4, the pixel columns R1~R25 belong to the partition C1, and the rest can be deduced by analogy . In the following description, it is assumed that the backlight in the backlight partition B1 is located directly below the central pixel column R12 of the partition C1. Therefore, in the following description, the optimization of the backlight brightness is for the pixel sequence R12. Of course, it can also be divided into more areas, such as 3 × 3 total nine areas. It is known to those skilled in the art that the present invention is not limited thereto, and the optimization of backlight brightness can also be directed to pixel columns at other locations.
灰階值統計單元202接收畫框資料Gray_T(n)，並分別統計各區A1~A4的灰階值分布情形，以得到各區A1~A4的直方圖(Histogram)信號H1(n)~H4(n)。直方圖信號H1(n)的例子如第2B圖所示。當然，本發明並不受限於此，灰階值統計單元202可用其他的統計方式來統計各區A1~A4的灰階值分布情形。 The grayscale value statistics unit 202 receives the frame data Gray_T(n), and separately calculates the grayscale value distribution of each zone A1~A4 to obtain a histogram signal H1(n)~H4 of each zone A1~A4. (n). An example of the histogram signal H1(n) is shown in Figure 2B. Of course, the present invention is not limited thereto, and the gray scale value statistics unit 202 may use other statistical methods to calculate the gray scale value distribution of each of the areas A1 to A4.
選擇單元204接收由灰階值統計單元202所傳來的直方圖信號H1(n)~H4(n)，並據以輸出畫框資料Gray_T(n)的各區A1~A4的代表性灰階值M1(n)~M4(n)。在本實施例中，“代表性灰階值”是指，在畫框資料Gray_T(n)的各區A1~A4中，有最高數量的灰階值。代表性灰階值M1(n)~M4(n)的定義可由第2B圖明瞭。如第2B圖所示，假設在直方圖信號H1(n)中，最多數量的灰階值為70，則 M1(n)=70。此外，代表性灰階也可以是，各區中同相位中有最高數量的灰階值，或分區中灰階值最大者。 The selecting unit 204 receives the histogram signals H1(n)~H4(n) transmitted by the grayscale value statistics unit 202, and outputs representative gray scales of the regions A1 to A4 of the frame data Gray_T(n). The value is M1(n)~M4(n). In the present embodiment, the "representative grayscale value" means that the highest number of grayscale values are present in each of the areas A1 to A4 of the frame data Gray_T(n). The definition of the representative grayscale values M1(n)~M4(n) can be illustrated by Figure 2B. As shown in FIG. 2B, it is assumed that in the histogram signal H1(n), the maximum number of grayscale values is 70, then M1(n)=70. In addition, the representative gray level may also be that the highest number of gray levels in the same phase in each zone, or the grayscale value in the partition is the largest.
背光亮度查表單元206接收由選擇單元204所傳來的代表性灰階值M1(n)~M4(n)，以得到相對應的背光亮度blu1_H(n)、blu1_L(n-1/2)、…blu4_H(n)、blu4_L(n-1/2)。該些背光亮度blu1_H(n)、blu1_L(n-1/2)、…blu4_H(n)、blu4_L(n-1/2)乃是用於驅動背光模組214內的背光源。 The backlight luminance lookup unit 206 receives the representative grayscale values M1(n) to M4(n) transmitted by the selection unit 204 to obtain corresponding backlight luminances blu1_H(n), blu1_L(n-1/2). , ... blu4_H(n), blu4_L(n-1/2). The backlight luminances blu1_H(n), blu1_L(n-1/2), ...blu4_H(n), and blu4_L(n-1/2) are backlights for driving the backlight module 214.
第3圖顯示背光亮度blu1_L與灰階值間的關係，其橫軸為代表性灰階值M1。比如，當代表性灰階值M1為1時，背光亮度blu1_L為1，其他可依此類推。在本實施例中，背光亮度值乃是相對亮度值，而非絕對亮度值。其他背光亮度blu2_L~blu4_L與代表性灰階值M2~M4間的關係可如第3圖所示。 Fig. 3 shows the relationship between the backlight luminance blu1_L and the grayscale value, and the horizontal axis thereof is the representative grayscale value M1. For example, when the representative grayscale value M1 is 1, the backlight luminance blu1_L is 1, and the others can be deduced by analogy. In this embodiment, the backlight brightness value is a relative brightness value, not an absolute brightness value. The relationship between the other backlight luminances blu2_L~blu4_L and the representative grayscale values M2 to M4 can be as shown in FIG.
第4圖顯示背光亮度blu1_H與灰階值間的關係，其橫軸為代表性灰階值M1。比如，當代表性灰階值M1為1時，背光亮度blu1_H為1，其他可依此類推。其他背光亮度blu2_H~blu4_H與代表性灰階值M2~M4間的關係可如第4圖所示。 Fig. 4 shows the relationship between the backlight luminance blu1_H and the grayscale value, and the horizontal axis thereof is the representative grayscale value M1. For example, when the representative grayscale value M1 is 1, the backlight luminance blu1_H is 1, and the others can be deduced by analogy. The relationship between the other backlight luminances blu2_H~blu4_H and the representative grayscale values M2 to M4 can be as shown in FIG.
由背光亮度查表單元206所輸出的相關於第n個畫框的背光亮度blu1_H(n)、blu1_L(n-1/2)、…blu4_H(n)、blu4_L(n-1/2)會儲存於背光亮度暫存器208內。背光亮度暫存器208會輸出相關於第n-1個畫框的背光亮度blu1_H(n-2/2)、blu1_L(n-3/2)、…blu4_H(n-2/2)、blu4_L(n-3/2)。在本實施例中，當接收到第n個畫框資料時，顯示面板238仍在顯示前一個(第n-1個)畫框，故而， 此時的背光模組214的背光亮度也是相關於前一個(第n-1個)畫框。 The backlight brightness blu1_H(n), blu1_L(n-1/2), ...blu4_H(n), blu4_L(n-1/2) related to the nth frame output by the backlight brightness lookup unit 206 are stored. In the backlight brightness register 208. The backlight luminance register 208 outputs the backlight luminances blu1_H(n-2/2), blu1_L(n-3/2), ...blu4_H(n-2/2), blu4_L (in relation to the n-1th frame). N-3/2). In this embodiment, when the nth frame data is received, the display panel 238 is still displaying the previous (n-1th) frame, and thus, The backlight brightness of the backlight module 214 at this time is also related to the previous (n-1th) frame.
時間多工器210接收由背光亮度暫存器208所輸出的相關於第n-1個畫框的背光亮度blu1_H(n-2/2)、blu1_L(n-3/2)、…blu4_H(n-2/2)、blu4_L(n-3/2)。當背光模組214內的相關背光源被打開時，其相關的背光亮度值會由時間多工器210輸出至背光驅動電路212。比如，當背光模組214的分區B1內的背光源被打開時，其相關的背光亮度值blu1_H(n-2/2)與blu1_L(n-3/2)會由時間多工器210輸出至背光驅動電路212，而此時，其餘的背光亮度值blu2_H(n-2/2)、blu2_L(n-3/2)、…blu4_H(n-2/2)、blu4_L(n-3/2)則尚未輸出至背光驅動電路212。 The time multiplexer 210 receives the backlight brightness blu1_H(n-2/2), blu1_L(n-3/2), ...blu4_H(n) related to the n-1th frame output by the backlight luminance register 208. -2/2), blu4_L(n-3/2). When the associated backlight in backlight module 214 is turned on, its associated backlight brightness value is output by time multiplexer 210 to backlight drive circuit 212. For example, when the backlight in the partition B1 of the backlight module 214 is turned on, its associated backlight luminance values blu1_H(n-2/2) and blu1_L(n-3/2) are outputted by the time multiplexer 210 to The backlight driving circuit 212, at this time, the remaining backlight luminance values blu2_H(n-2/2), blu2_L(n-3/2), ...blu4_H(n-2/2), blu4_L(n-3/2) Then, it is not output to the backlight driving circuit 212.
根據所接收到的背光亮度值，背光驅動電路212會驅動背光模組214，以照亮顯示面板238。背光模組214內的背光源比如可為CCFL或LED等。 The backlight driving circuit 212 drives the backlight module 214 to illuminate the display panel 238 according to the received backlight brightness value. The backlight in the backlight module 214 can be, for example, a CCFL or an LED.
灰階值查表單元222與224接收第n個畫框資料的灰階值Gray_T(n)，以得到其相對應的高低灰階值Gray_L(n)與Gray_H(n-1/2)。第5圖顯示灰階值Gray_L與Gray_H的曲線圖，其中橫軸代表灰階值Gray_T(n)。一個灰階值Gray_T(n)會對應到一個灰階值Gray_L(n)與一個灰階值Gray_H(n-1/2)。比如，當灰階值Gray_T(n)為211，灰階值Gray_L(n)為63而灰階值Gray_H(n-1/2)為255，其餘可依此類推。 The grayscale value lookup table units 222 and 224 receive the grayscale value Gray_T(n) of the nth frame data to obtain their corresponding high and low grayscale values Gray_L(n) and Gray_H(n-1/2). Fig. 5 is a graph showing grayscale values Gray_L and Gray_H, in which the horizontal axis represents the grayscale value Gray_T(n). A grayscale value Gray_T(n) corresponds to a grayscale value Gray_L(n) and a grayscale value Gray_H(n-1/2). For example, when the grayscale value Gray_T(n) is 211, the grayscale value Gray_L(n) is 63, and the grayscale value Gray_H(n-1/2) is 255, the rest can be deduced by analogy.
暫存器226與228會分別暫存由灰階值查表單元222與224所輸出的對應於第n個畫框資料的高低灰階值 Gray_L(n)與Gray_H(n-1/2)；並分別輸出對應於前一個(第n-1個)畫框資料的灰階值Gray_L(n-2/2)與Gray_H(n-3/2)。 The registers 226 and 228 temporarily store the high and low grayscale values corresponding to the nth frame data output by the grayscale value lookup table units 222 and 224, respectively. Gray_L(n) and Gray_H(n-1/2); and output grayscale values Gray_L(n-2/2) and Gray_H(n-3/) corresponding to the previous (n-1th) frame data, respectively. 2).
時間多工器230接收由暫存器226與228所輸出的灰階值Gray_L(n-2/2)與Gray_H(n-3/2)，並輸出給時序控制器232。 The time multiplexer 230 receives the grayscale values Gray_L(n-2/2) and Gray_H(n-3/2) outputted from the registers 226 and 228, and outputs them to the timing controller 232.
時序控制器232、閘極驅動電路234與源極驅動電路236的架構與功能在此可不需特別限定。 The architecture and function of the timing controller 232, the gate driving circuit 234, and the source driving circuit 236 are not particularly limited herein.
在閘極驅動電路234與源極驅動電路236的驅動下，顯示面板238顯示畫框資料。 The display panel 238 displays the frame material under the driving of the gate driving circuit 234 and the source driving circuit 236.
底下描述在本實施例中，如何根據灰階值M1、Gray_L與Gray_H以得到背光亮度blu1_L與blu1_H。 In the present embodiment, how to obtain the backlight luminances blu1_L and blu1_H according to the grayscale values M1, Gray_L, and Gray_H is described below.
首先，根據灰階值查表單元222與224，得到對應於灰階值M1的Gray_L與Gray_H，其中，M1=(Gray_L+Gray_H)/2 (1) First, according to the grayscale value lookup table units 222 and 224, Gray_L and Gray_H corresponding to the grayscale value M1 are obtained, where M1=(Gray_L+Gray_H)/2 (1)
接著，令變數G為：G=Gray_H/Gray_L (2) Next, let the variable G be: G=Gray_H/Gray_L (2)
當在顯示灰階值為M1的畫框時，如果子畫框的灰階值為Gray_H且其相關的背光亮度為blu1_L，則Gray_H*blu1_L=M1 (3) When the frame with the grayscale value of M1 is displayed, if the grayscale value of the subframe is Gray_H and its associated backlight brightness is blu1_L, then Gray_H*blu1_L=M1 (3)
整理上述公式(1)~(3)可得到：blu1_L=M1/(G*Gray_L)=M1/(G*(2M1-Gray_H) (4) By arranging the above formulas (1) to (3), we can get: blu1_L=M1/(G*Gray_L)=M1/(G*(2M1-Gray_H) (4)
當在顯示灰階值為M1的畫框時，如果子畫框的灰階值為Gray_L且其相關的背光亮度為blu1_H，則Gray_L*blu1_H=M1 (5) When the frame with the grayscale value of M1 is displayed, if the grayscale value of the subframe is Gray_L and the associated backlight brightness is blu1_H, then Gray_L*blu1_H=M1 (5)
整理公式(1)、(2)與(5)可得到：blu1_H=M1/(Gray_H*G)=M1*G/(2M1-Gray_L) (6) By formulating formulas (1), (2), and (5), we can get: blu1_H=M1/(Gray_H*G)=M1*G/(2M1-Gray_L) (6)
其他背光亮度blu2_H、blu2_L…blu4_H、blu4_L也可依此求出。 Other backlight luminances blu2_H, blu2_L...blu4_H, blu4_L can also be obtained from this.
為了解本實施例的優點，請參照第6A圖~第6E圖，其顯示本實施例在消除閃爍上的功效。 In order to understand the advantages of this embodiment, please refer to FIGS. 6A to 6E, which show the effect of the present embodiment on eliminating flicker.
第6A圖顯示，某一列畫素(如畫素列R12)在顯示代表性灰階值M1時的曲線圖。在第6A圖中，曲線S11代表高低灰階值Gray_L與Gray_H，而BL_AVG代表平均背光亮度值，曲線S12代表畫素列R12的顯示亮度。如果背光亮度的最佳化乃是針對畫素列R12於顯示代表性灰階值M1，則畫素列R12的閃爍情況可獲得大幅改善。 Fig. 6A shows a graph of a column of pixels (e.g., pixel sequence R12) when the representative grayscale value M1 is displayed. In FIG. 6A, the curve S11 represents the high and low grayscale values Gray_L and Gray_H, and BL_AVG represents the average backlight luminance value, and the curve S12 represents the display luminance of the pixel sequence R12. If the backlight brightness is optimized by displaying the representative grayscale value M1 for the pixel sequence R12, the flickering of the pixel sequence R12 can be greatly improved.
第6B圖顯示，某一列畫素(如畫素列R12)分別在顯示兩種灰階值(如代表性灰階值M1與另一灰階值)時的曲線圖。在第6B圖中，曲線S21代表另一個灰階值，曲線S22代表對應於代表性灰階值M1的高低灰階值Gray_L與Gray_H，曲線S23代表對應於另一灰階值的高低灰階值Gray_L與Gray_H。曲線S24代表畫素列R12在顯示代表性灰階值M1時的顯示亮度，而曲線S25代表畫素列R12在顯示另一灰階值時的顯示亮度。 Figure 6B shows a graph of a column of pixels (e.g., pixel sequence R12) showing two grayscale values, such as a representative grayscale value M1 and another grayscale value, respectively. In Fig. 6B, the curve S21 represents another grayscale value, the curve S22 represents the high and low grayscale values Gray_L and Gray_H corresponding to the representative grayscale value M1, and the curve S23 represents the high and low grayscale values corresponding to another grayscale value. Gray_L and Gray_H. The curve S24 represents the display brightness of the pixel column R12 when the representative grayscale value M1 is displayed, and the curve S25 represents the display luminance of the pixel column R12 when another grayscale value is displayed.
如第6B圖所示，如果背光亮度的最佳化乃是針對畫素列R12在顯示代表性灰階值M1，則畫素列R12在顯示另一灰階值時雖仍會出現少許閃爍情況，但相較於習知技術，此閃爍情況已獲得大幅改善。 As shown in FIG. 6B, if the backlight brightness is optimized by displaying the representative grayscale value M1 for the pixel sequence R12, the pixel sequence R12 still shows a little flicker when displaying another grayscale value. However, this flicker situation has been greatly improved compared to conventional techniques.
第6C圖顯示，某一列畫素(如畫素列R12)分別在顯 示兩種灰階值(如代表性灰階值M1與另一灰階值)時的曲線圖。在第6C圖中，曲線S31代表另一個灰階值，曲線S32代表對應於代表性灰階值M1的高低灰階值Gray_L與Gray_H，曲線S33代表對應於另一灰階值的高低灰階值Gray_L與Gray_H。曲線S34代表畫素列R12在顯示代表性灰階值M1時的顯示亮度，而曲線S35代表畫素列R12在顯示另一灰階值時的顯示亮度。 Figure 6C shows that a column of pixels (such as the pixel column R12) is displayed separately A graph showing two grayscale values, such as a representative grayscale value M1 and another grayscale value. In Fig. 6C, the curve S31 represents another grayscale value, the curve S32 represents the high and low grayscale values Gray_L and Gray_H corresponding to the representative grayscale value M1, and the curve S33 represents the high and low grayscale values corresponding to another grayscale value. Gray_L and Gray_H. The curve S34 represents the display brightness of the pixel column R12 when the representative grayscale value M1 is displayed, and the curve S35 represents the display luminance of the pixel column R12 when another grayscale value is displayed.
第6C圖所示，如果背光亮度的最佳化乃是針對畫素列R12在顯示另一灰階值，則畫素列R12在顯示代表性灰階值M1時雖仍會出現少許閃爍情況，但相較於習知技術，此閃爍情況已獲得大幅改善。 As shown in FIG. 6C, if the brightness of the backlight is optimized to display another grayscale value for the pixel sequence R12, the pixel sequence R12 still shows a slight flicker when the representative grayscale value M1 is displayed. However, this flicker situation has been greatly improved compared to conventional techniques.
第6D圖顯示，某二列畫素(如畫素列R12與R24)分別在顯示代表性灰階值M1時的曲線圖。在第6D圖中，曲線S41為畫素列R12的高低灰階值Gray_L與Gray_H(其對應於代表性灰階值M1)，而曲線S42為畫素列R24的高低灰階值Gray_L與Gray_H(其對應於代表性灰階值M1)。曲線S43代表畫素列R12在顯示代表性灰階值M1時的顯示亮度，而曲線S44代表畫素列R24在顯示代表性灰階值M1時的顯示亮度。 Fig. 6D shows a graph of a certain two columns of pixels (e.g., pixel columns R12 and R24) respectively showing a representative grayscale value M1. In FIG. 6D, the curve S41 is the high and low grayscale values Gray_L and Gray_H of the pixel sequence R12 (which corresponds to the representative grayscale value M1), and the curve S42 is the high and low grayscale values Gray_L and Gray_H of the pixel sequence R24 ( It corresponds to the representative gray scale value M1). The curve S43 represents the display luminance of the pixel sequence R12 when the representative grayscale value M1 is displayed, and the curve S44 represents the display luminance of the pixel sequence R24 when the representative grayscale value M1 is displayed.
如第6D圖所示，由於乃是針對畫素列R12在顯示代表性灰階值M1時，對背光亮度進行最佳化，所以當畫素列R24顯示代表性灰階值M1時仍會出現少許閃爍情況(這是因為畫素列R12與畫素列R24的導通時間不同所造成)，但相較於習知技術，此閃爍情況已獲得大幅改善。 As shown in FIG. 6D, since the backlight luminance is optimized for displaying the representative grayscale value M1 for the pixel sequence R12, the pixel sequence R24 still appears when the representative grayscale value M1 is displayed. A little flickering situation (this is due to the difference in the on-time between the pixel sequence R12 and the pixel column R24), but this flicker situation has been greatly improved compared to the prior art.
第6E圖顯示，某一列畫素(如畫素列R12)在顯示代 表性灰階值M1時的曲線圖，其中畫素列R12的最終顯示亮度會受到其他背光源的影響。在第6E圖中，曲線S51為畫素列R12的高低灰階值Gray_L與Gray_H(其對應於代表性灰階值M1)，曲線S52為背光模組的分區B1的背光源對畫素列R12的發光亮度，而曲線S53為背光模組的其他分區(如分區B2)的背光源對畫素列R12的發光亮度，曲線S54代表畫素列R12在顯示代表性灰階值M1時的顯示亮度。 Figure 6E shows that a column of pixels (such as the pixel column R12) is displayed in the generation A graph of the apparent gray scale value M1, in which the final display brightness of the pixel sequence R12 is affected by other backlights. In FIG. 6E, the curve S51 is the high and low grayscale values Gray_L and Gray_H of the pixel sequence R12 (which corresponds to the representative grayscale value M1), and the curve S52 is the backlight pair pixel column R12 of the partition B1 of the backlight module. The brightness of the light is emitted, and the curve S53 is the luminance of the backlight of the other partitions of the backlight module (such as the partition B2) to the pixel column R12, and the curve S54 represents the display brightness of the pixel column R12 when the representative grayscale value M1 is displayed. .
如果針對畫素列R12在顯示代表性灰階值M1時，對背光亮度進行最佳化，但由於不同分區內的背光源的導通時間可能有所重疊，所以畫素列R12可能會受到其他背光源的影響，而使得畫素列R12在顯示代表性灰階值M1時仍會出現少許閃爍情況。但相較於習知技術，此閃爍情況已獲得大幅改善。此外，於本發明其他可能實施例中，可在背光源分區的區域邊緣加上隔板，以避免不同區域中的不同亮度的背光互相影響。 If the brightness of the backlight is optimized for the representative gray scale value M1 for the pixel sequence R12, since the on-time of the backlights in different partitions may overlap, the pixel sequence R12 may be subjected to other backlights. The influence of the source causes the pixel column R12 to still show a slight flicker when displaying the representative grayscale value M1. However, this flicker situation has been greatly improved compared to conventional techniques. In addition, in other possible embodiments of the present invention, a spacer may be added to the edge of the area of the backlight partition to prevent backlights of different brightness in different areas from affecting each other.
或者，如若將背光源分為3×3共九區，則可先將中心區域和周圍區域作平滑(smooth)運算，計算出中心區域的代表性灰階值，再調變背光。 Alternatively, if the backlight is divided into three regions of 3×3, the central region and the surrounding region may be first smoothed, the representative grayscale value of the central region is calculated, and the backlight is modulated.
假設背光源之分區及其原始代表性灰階值M1(n)~M9(n)如下表所示：
將中心區域和周圍區域作平滑運算後，中心區域的新代表性灰階值M5’(n)如下所示：M5，(n)=[M1(n)+M2(n)+M3(n)+M4(n)+M5(n)+M6(n)+M7(n)+M8(n)+M9(n)]/9 After smoothing the center area and the surrounding area, the new representative gray scale value M5'(n) of the center area is as follows: M5, (n) = [M1(n) + M2(n) + M3(n) +M4(n)+M5(n)+M6(n)+M7(n)+M8(n)+M9(n)]/9
亦即，經過平滑運算後，背光源之分區及其新代表性灰階值如下表所示：
第7圖顯示正看與側看的珈瑪曲線圖。在第7圖中，S71代表正看的珈瑪曲線圖；S72代表側看的習知珈瑪曲線圖；S73代表經過本實施例補償後的側看的珈瑪曲線圖。比較曲線S72與S73可發現，曲線S73較曲線S72更接近曲線S71。也就是，本實施例在改善側看的珈瑪曲線上確有功效。 Figure 7 shows the gamma graphs looking at and looking at the side. In Fig. 7, S71 represents a gamma graph which is being viewed; S72 represents a conventional gamma graph viewed from the side; and S73 represents a gamma graph which is side-viewed after being compensated by the present embodiment. Comparing the curves S72 and S73, it can be found that the curve S73 is closer to the curve S71 than the curve S72. That is, this embodiment does have an effect in improving the side-viewing gamma curve.
第8圖顯示根據本發明實施例在正看與側看時的顯示亮度曲線圖。第9圖顯示習知技術(左半部)與本發明實施例(右半部)在正看與側看時的顯示亮度曲線圖。在第9圖中，虛線代表側看時的曲線，而實線則代表正看時的曲線。 Figure 8 is a graph showing the display luminance when viewed from the side and side viewed according to an embodiment of the present invention. Fig. 9 is a graph showing the display luminance of the conventional technique (left half) and the embodiment of the present invention (right half) when viewed from the side and side. In Fig. 9, the broken line represents the curve when viewed from the side, and the solid line represents the curve when viewed.
如第8圖與第9圖所示，由於本實施例針對背光亮度進行補償與最佳化，所以即使使用者在側看影像，使用者也不易發覺閃爍。故而，本實施例能大幅改善閃爍情況。 此外，如第9圖所示，透過本實施例，能讓側看的曲線儘量接近正看的曲線，故能有效改善側看時的色偏現象。 As shown in FIGS. 8 and 9, since the present embodiment compensates and optimizes the brightness of the backlight, even if the user views the image on the side, the user is less likely to notice the flicker. Therefore, this embodiment can greatly improve the flicker situation. Further, as shown in Fig. 9, with this embodiment, the curve viewed from the side can be made as close as possible to the curve being viewed, so that the color shift phenomenon at the time of side view can be effectively improved.
綜上所述，雖然本發明已以實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，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。 In conclusion, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.
Gray_T、Gray_L、Gray_H‧‧‧灰階值 Gray_T, Gray_L, Gray_H‧‧‧ grayscale values
FL‧‧‧閃爍 FL‧‧‧ flashing
200‧‧‧影像顯示裝置 200‧‧‧Image display device
202‧‧‧灰階值統計單元 202‧‧‧ Grayscale value statistics unit
204‧‧‧選擇單元 204‧‧‧Selection unit
206‧‧‧背光亮度查表單元 206‧‧‧Backlight brightness check unit
208‧‧‧背光亮度暫存器 208‧‧‧Backlight Brightness Register
210‧‧‧時間多工器 210‧‧‧Time multiplexer
212‧‧‧背光驅動電路 212‧‧‧Backlight drive circuit
214‧‧‧背光模組 214‧‧‧Backlight module
222、224‧‧‧灰階值查表單元 222, 224‧‧‧ gray scale value lookup unit
226、228‧‧‧暫存器 226, 228‧‧ ‧ register
230‧‧‧時間多工器 230‧‧‧Time multiplexer
232‧‧‧時序控制器 232‧‧‧Sequence Controller
234‧‧‧閘極驅動電路 234‧‧‧ gate drive circuit
236‧‧‧源極驅動電路 236‧‧‧Source drive circuit
238‧‧‧顯示面板 238‧‧‧ display panel
A1~A4‧‧‧畫框資料的分區 Partition of A1~A4‧‧‧ frame data
B1~B4‧‧‧背光源分區 B1~B4‧‧‧Backlight partition
C1~C4‧‧‧顯示面板的分區 C1~C4‧‧‧ display panel partition
R1~R100‧‧‧畫素列 R1~R100‧‧‧画素
H1~H4‧‧‧直方圖信號 H1~H4‧‧‧ Histogram signal
M1~M4‧‧‧代表性灰階值 M1~M4‧‧‧ representative grayscale value
blu1_H、blu1_L、…blu4_H、blu4_L‧‧‧背光亮度 blu1_H, blu1_L, ... blu4_H, blu4_L‧‧‧ backlight brightness
BL_AVG、S11~S73‧‧‧曲線 BL_AVG, S11~S73‧‧‧ Curve
第1A圖顯示正看與側看的珈瑪曲線。 Figure 1A shows the gamma curve looking at and looking at the side.
第1B圖顯示習知技術的灰階值、背光亮度與顯示亮度的曲線圖，其中將一個顯示畫框分解成兩個子畫框。 FIG. 1B shows a graph of grayscale values, backlight brightness, and display brightness of the prior art, in which one display frame is decomposed into two sub-frames.
第2A圖顯示根據本發明一實施例的影像顯示裝置的方塊示意圖。 2A is a block diagram showing an image display device according to an embodiment of the invention.
第2B圖顯示根據本發明實施例的直方圖信號與代表性灰階值的示意圖。 Figure 2B shows a schematic diagram of a histogram signal and representative grayscale values in accordance with an embodiment of the present invention.
第3圖顯示背光亮度blu1_L與灰階值間的關係。 Figure 3 shows the relationship between the backlight brightness blu1_L and the grayscale value.
第4圖顯示背光亮度blu1_H與灰階值間的關係。 Figure 4 shows the relationship between backlight brightness blu1_H and grayscale values.
第5圖顯示灰階值Gray_L與Gray_H的曲線圖。 Figure 5 shows a graph of grayscale values Gray_L and Gray_H.
第6A圖顯示，某一列畫素在顯示代表性灰階值時的曲線圖。 Figure 6A shows a graph of a column of pixels when displaying representative grayscale values.
第6B圖顯示，某一列畫素分別在顯示兩種灰階值時的曲線圖。 Figure 6B shows a graph of a column of pixels when displaying two grayscale values, respectively.
第6C圖顯示，某一列畫素分別在顯示兩種灰階值時的曲線圖。 Figure 6C shows a graph of a column of pixels when displaying two grayscale values, respectively.
第6D圖顯示，某二列畫素分別在顯示代表性灰階值 時的曲線圖。 Figure 6D shows that a certain two columns of pixels are displaying representative grayscale values respectively. The graph of the time.
第6E圖顯示，某一列畫素在顯示代表性灰階值時的曲線圖，其中畫素列的最終顯示亮度會受到其他背光源的影響。 Figure 6E shows a graph of a column of pixels when displaying representative grayscale values, where the final display brightness of the pixel columns is affected by other backlights.
第7圖顯示正看與側看的珈瑪曲線圖。 Figure 7 shows the gamma graphs looking at and looking at the side.
第8圖顯示根據本發明實施例在正看與側看時的顯示亮度曲線圖。 Figure 8 is a graph showing the display luminance when viewed from the side and side viewed according to an embodiment of the present invention.
第9圖顯示習知技術(左半部)與本發明實施例(右半部)在正看與側看時的顯示亮度曲線圖。 Fig. 9 is a graph showing the display luminance of the conventional technique (left half) and the embodiment of the present invention (right half) when viewed from the side and side.
Gray_L(n-1)、Gray_L(n)、Gray_H(n-1/2)、Gray_H(n+1/2)、M1‧‧‧灰階值 Gray_L(n-1), Gray_L(n), Gray_H(n-1/2), Gray_H(n+1/2), M1‧‧‧ grayscale values
blu1_H(n-1)、blu1_H(n)、blu1_L(n-1/2)、blu1_L(n+1/2)‧‧‧背光亮度 blu1_H(n-1), blu1_H(n), blu1_L(n-1/2), blu1_L(n+1/2)‧‧‧ backlight brightness
BL_AVG、S11~S12‧‧‧曲線 BL_AVG, S11~S12‧‧‧ Curve
Claims (18)
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