TWI409795B - Driving method for liquid crystal panel and lcd - Google Patents
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本發明是有關於一種液晶面板驅動方法及液晶顯示器，且特別是有關於一種具有高影像畫面品質之液晶面板驅動方法及液晶顯示器。The present invention relates to a liquid crystal panel driving method and a liquid crystal display, and more particularly to a liquid crystal panel driving method and a liquid crystal display having high image quality.
液晶面板為了使不同灰階值的白色色溫能夠維持在一特定的色度點上，必須應用白平衡(white tracking)的技術以修正液晶面板的光學特性。請參照表一及表二，表一為三原色訊號之示意圖，表二為經白平衡校正後之三原色訊號之示意圖。白平衡技術通常係以三原色訊號之綠色灰階值為基準，進而改變三原色訊號之紅色灰階值及藍色灰階值，使得輸出至液晶面板之三原色訊號被校正，以維持白色色溫於特定的色度點。In order to maintain the white color temperature of different gray scale values at a specific chromaticity point, a white tracking technique must be applied to correct the optical characteristics of the liquid crystal panel. Please refer to Table 1 and Table 2. Table 1 is a schematic diagram of the three primary color signals, and Table 2 is a schematic diagram of the three primary color signals after white balance correction. The white balance technique usually uses the green grayscale value of the three primary color signals as a reference to change the red grayscale value and the blue grayscale value of the three primary color signals, so that the three primary color signals output to the liquid crystal panel are corrected to maintain the white color temperature for a specific color. Chroma point.
另外，液晶分子的反應時間係與液晶分子兩端的跨壓有關，故為了使得液晶分子之反應速度提升，須採用過驅動(overdriving)的技術以提高液晶分子的反應速度，即施加一比欲顯示灰階值來的大的過驅動灰階值，使得像素得以於一圖框時間內顯示欲顯示灰階值。若不對三原色訊號做白平衡的處理，當三原色訊號之紅色灰階值、綠色灰階值及藍色灰階值相同時，則所相對應之液晶分子採用過驅動技術時之反應時間亦相同，不會產生色斑。In addition, the reaction time of the liquid crystal molecules is related to the transposition pressure at both ends of the liquid crystal molecules. Therefore, in order to increase the reaction speed of the liquid crystal molecules, an overdriving technique must be employed to increase the reaction speed of the liquid crystal molecules, that is, to apply a ratio to be displayed. The large overdrive grayscale value from the grayscale value allows the pixel to display the grayscale value to be displayed within a frame time. If the three primary color signals are not subjected to white balance processing, when the red grayscale value, the green grayscale value and the blue grayscale value of the three primary color signals are the same, the reaction time of the corresponding liquid crystal molecules using the overdrive technique is also the same. No spots will be produced.
若是對三原色訊號進行白平衡的處理，則三原色訊號之紅色灰階值、綠色灰階值及藍色灰階值改變。例如，若對一個8位元的液晶面板來說，各像素可呈現28 =256個不同的灰階。若採用過驅動技術，且理論上每一個先前灰階值對應至一目前灰階值均會有一相對應的過驅動灰階值，那麼過驅動查閱表的大小將會是256x256位元，例如為表三，其為過驅動查閱表之一例之示意圖。然而，基於 硬體成本的考量，通常不會使用如此大的過驅動查閱表，而使用過驅動界限(OD boundary)查閱表以節省成本。過驅動界限查閱表通常將幾個連續灰階視為一界限範圍，例如請參照表四，其為過驅動界限查閱表之一例之示意圖。於表四中，先前邊界值0即代表先前灰階值0至5灰階的範圍，目前邊界值19即代表目前灰階值19至25灰階的範圍。If the three primary color signals are white balanced, the red grayscale value, the green grayscale value, and the blue grayscale value of the three primary color signals are changed. For example, for an 8-bit LCD panel, each pixel can exhibit 2 8 = 256 different gray levels. If overdrive technology is used, and theoretically each previous grayscale value corresponds to a current grayscale value, there will be a corresponding overdrive grayscale value, then the size of the overdrive lookup table will be 256x256 bits, for example Table 3 is a schematic diagram of an example of an overdrive lookup table. However, based on hardware cost considerations, such large overdrive lookup tables are typically not used, and OD boundary lookup tables are used to save cost. The overdrive limit lookup table usually treats several consecutive grayscales as a bounding range. For example, please refer to Table 4, which is a schematic diagram of an example of an overdrive limit lookup table. In Table 4, the previous boundary value 0 represents the range of gray scale values of the previous gray scale values of 0 to 5, and the current boundary value 19 represents the range of gray scale values of the current gray scale values of 19 to 25.
然而，紅色灰階值、綠色灰階值及藍色灰階值通常係均依據單一綠色灰階值的過驅動界限查閱表來進行查表的動作。請參照第1圖，其繪示傳統液晶顯示器之示意圖。液晶顯示器300包括液晶面板310、掃描驅動單元315、白平衡單元320、暫存器340、過驅動350以及資料驅動單元360。液晶面板310具有多個畫素(未繪示於圖)。掃描驅動單元315用以控制該些畫素。白平衡單元320接收一三原色訊號CS，並對三原色訊號CS進行白平衡的處理。茲以先前灰階值(R,G,B)為(19,19,19)及目前灰階值(R,G,B)為(32,32,32)為例進行說明。若未對三原色訊號CS進行白平衡的處理，則過驅動單元350依據綠色過驅動界限查閱表得到的過驅動灰階值應為(X,X,X)。而若對三原色訊號CS進行白平衡的處理，則過驅動單元350將儲存於暫存器340之先前灰階值(R,G,B)例如轉換為(22,19,15)，並將目前灰階值(R,G,B)例如轉換為(37,32,26)。如此一來，過驅動單元350依據綠色過驅動界限查閱表後得到的過驅動灰階值改變為(Y,X,Z)。However, the red grayscale value, the green grayscale value, and the blue grayscale value are generally performed by looking up the table according to the overdrive limit lookup table of a single green grayscale value. Please refer to FIG. 1 , which illustrates a schematic diagram of a conventional liquid crystal display. The liquid crystal display 300 includes a liquid crystal panel 310, a scan driving unit 315, a white balance unit 320, a register 340, an overdrive 350, and a material drive unit 360. The liquid crystal panel 310 has a plurality of pixels (not shown). The scan driving unit 315 is used to control the pixels. The white balance unit 320 receives a three primary color signals CS and performs white balance processing on the three primary color signals CS. The previous gray scale values (R, G, B) are (19, 19, 19) and the current gray scale values (R, G, B) are (32, 32, 32) as an example. If the three primary color signals CS are not subjected to white balance processing, the overdrive driving gray level value obtained by the overdrive unit 350 according to the green overdrive limit lookup table should be (X, X, X). If the three primary color signals CS are white balanced, the overdrive unit 350 converts the previous grayscale values (R, G, B) stored in the register 340 to, for example, (22, 19, 15), and will present The grayscale value (R, G, B) is, for example, converted to (37, 32, 26). As a result, the overdrive driving unit 350 changes the overdrive grayscale value obtained according to the green overdrive limit lookup table to (Y, X, Z).
亦即，白平衡處理完後之三原色訊號，其所對應之紅色過驅動灰階值、綠色過驅動灰階值及藍色過驅動灰階值 改變，而與未經過白平衡處理前所得之過驅動灰階值不同。故資料驅動單元360實質上係依據不正確的過驅動灰階值驅動液晶面板310上相對應之畫素，使得液晶面板310呈現失真的影像畫面。請參照第2圖，其繪示傳統應用白平衡技術及過驅動技術之一例之示意圖。因為紅色過驅動灰階值、綠色過驅動灰階值及藍色過驅動灰階值不一致，故相對應之時間亮度曲線不相同，使得相對應之液晶分子之反應時間不一致。如此一來，在一個圖框時間內，紅色、藍色與綠色三個畫素呈現不同的相對亮度，導致人眼觀察到色斑現象，因而造成影像畫面品質的劣化。That is, the three primary color signals after the white balance processing, the corresponding red overdrive grayscale value, the green overdrive grayscale value, and the blue overdrive grayscale value Change, but different from the overdrive grayscale value obtained before the white balance process. Therefore, the data driving unit 360 substantially drives the corresponding pixels on the liquid crystal panel 310 according to the incorrect overdrive gray scale value, so that the liquid crystal panel 310 presents a distorted image frame. Please refer to FIG. 2, which illustrates a schematic diagram of an example of a conventional application of white balance technology and overdrive technology. Because the red overdrive grayscale value, the green overdrive grayscale value, and the blue overdrive grayscale value are inconsistent, the corresponding time luminance curves are different, so that the reaction time of the corresponding liquid crystal molecules is inconsistent. In this way, in a frame time, the three pixels of red, blue and green exhibit different relative brightness, which causes the human eye to observe the phenomenon of color spots, thereby deteriorating the quality of the image.
本發明係有關於一種液晶面板驅動方法及液晶顯示器，改進液晶面板之過驅動方法，使得液晶顯示器能夠同時應用過驅動技術及白平衡技術，而不會產生色斑。The invention relates to a liquid crystal panel driving method and a liquid crystal display, and improves the overdriving method of the liquid crystal panel, so that the liquid crystal display can simultaneously apply the overdrive technology and the white balance technology without generating color spots.
根據本發明之第一方面，提出一種液晶面板驅動方法，包括下列步驟。接收一第一原色灰階值、一第二原色灰階值及一第三原色灰階值。依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，其中，白平衡查閱表係依據第一原色灰階值以建立。分別依據一第一原色界限、一第二原色界限及一第三原色界限，轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。依據第一原色邊界值與一先前第一原色邊界值輸出 一第一原色過驅動灰階值、依據第二原色邊界值與一先前第二原色邊界值輸出一第二原色過驅動灰階值及依據第三原色邊界值與一先前第三原色邊界值輸出一第三原色過驅動灰階值以驅動液晶面板上相對應之畫素。According to a first aspect of the present invention, a liquid crystal panel driving method is provided, comprising the following steps. Receiving a first primary color grayscale value, a second primary color grayscale value, and a third primary color grayscale value. The second primary color grayscale value and the third primary color grayscale value are corrected according to a white balance lookup table, wherein the white balance lookup table is established according to the first primary color grayscale value. Converting the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value to a first primary color according to a first primary color limit, a second primary color limit, and a third primary color limit respectively A boundary value, a second primary color boundary value, and a third primary color boundary value. Output according to the first primary color boundary value and a previous first primary color boundary value a first primary color overdrive grayscale value, a second primary color overdrive grayscale value according to a second primary color boundary value and a previous second primary color boundary value, and a third primary color boundary value and a previous third primary color boundary value outputted according to a third primary color boundary value The three primary colors overdrive the grayscale values to drive the corresponding pixels on the liquid crystal panel.
根據本發明之第二方面，提出一種液晶顯示器，包括液晶面板、掃描驅動單元、白平衡單元、轉換單元、過驅動單元以及資料驅動單元。液晶面板具有多個畫素。掃描驅動單元控制此些畫素。白平衡單元接收一第一原色灰階值、一第二原色灰階值及一第三原色灰階值。白平衡單元依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，其中，白平衡查閱表係依據第一原色灰階值以建立。轉換單元分別依據一第一原色界限、一第二原色界限及一第三原色界限，轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。過驅動單元依據第一原色邊界值與一先前第一原色邊界值輸出一第一原色過驅動灰階值、依據第二原色邊界值與一先前第二原色邊界值輸出一第二原色過驅動灰階值及依據第三原色邊界值與一先前第三原色邊界值輸出一第三原色過驅動灰階值。資料驅動單元依據第一原色過驅動灰階值、第二原色過驅動灰階值及第三原色過驅動灰階值驅動相對應之畫素。According to a second aspect of the present invention, a liquid crystal display is provided, comprising a liquid crystal panel, a scan driving unit, a white balance unit, a conversion unit, an overdrive unit, and a data drive unit. The liquid crystal panel has a plurality of pixels. The scan drive unit controls these pixels. The white balance unit receives a first primary color grayscale value, a second primary color grayscale value, and a third primary color grayscale value. The white balance unit corrects the second primary color grayscale value and the third primary color grayscale value according to a white balance lookup table, wherein the white balance lookup table is established according to the first primary color grayscale value. The converting unit converts the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value according to a first primary color limit, a second primary color limit, and a third primary color limit respectively. A primary color boundary value, a second primary color boundary value, and a third primary color boundary value. The overdrive unit outputs a first primary color overdrive grayscale value according to the first primary color boundary value and a previous first primary color boundary value, and outputs a second primary color overdrive ash according to the second primary color boundary value and a previous second primary color boundary value. The step value outputs a third primary color overdrive grayscale value according to the third primary color boundary value and a previous third primary color boundary value. The data driving unit drives the corresponding pixel according to the first primary color overdrive grayscale value, the second primary color overdrive grayscale value, and the third primary color overdrive grayscale value.
根據本發明之第三方面，提出一種液晶面板驅動方法，包括下列步驟。接收一第一原色灰階值、一第二原色 灰階值及一第三原色灰階值。依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，其中，白平衡查閱表係依據第一原色灰階值以建立。依據一第一原色界限轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。依據白平衡查閱表，分別校正第二原色邊界值及第三原色邊界值。依據第一原色邊界值與一先前第一原色邊界值輸出一第一原色過驅動灰階值、依據校正後之第二原色邊界值與一先前第二原色邊界值輸出一第二原色過驅動灰階值及依據校正後之第三原色邊界值與一先前第三原色邊界值輸出一第三原色過驅動灰階值以驅動液晶面板上相對應之畫素。According to a third aspect of the present invention, a liquid crystal panel driving method is provided, comprising the following steps. Receiving a first primary color grayscale value, a second primary color Gray scale value and a third primary color gray scale value. The second primary color grayscale value and the third primary color grayscale value are corrected according to a white balance lookup table, wherein the white balance lookup table is established according to the first primary color grayscale value. Converting the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value to a first primary color boundary value, a second primary color boundary value, and a third primary color according to a first primary color limit Boundary value. According to the white balance lookup table, the second primary color boundary value and the third primary color boundary value are respectively corrected. Outputting a first primary color overdrive grayscale value according to the first primary color boundary value and a previous first primary color boundary value, outputting a second primary color overdrive gray according to the corrected second primary color boundary value and a previous second primary color boundary value The step value and the corrected third primary color boundary value and a previous third primary color boundary value output a third primary color overdrive grayscale value to drive the corresponding pixel on the liquid crystal panel.
根據本發明之第四方面，提出一種液晶顯示器，包括液晶面板、掃描驅動單元、白平衡單元、轉換單元、校正單元、過驅動單元以及資料驅動單元。液晶面板具有多個畫素。白平衡單元接收一第一原色灰階值、一第二原色灰階值及一第三原色灰階值。白平衡單元依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，其中，白平衡查閱表係依據第一原色灰階值以建立。轉換單元依據一第一原色界限，轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。校正單元依據白平衡查閱表，分別校正第二原色邊界值及第三原色邊界值。過驅動單元依據第一原色邊界值與一先前第一原色邊界 值輸出一第一原色過驅動灰階值、依據校正後之第二原色邊界值與一先前第二原色邊界值輸出一第二原色過驅動灰階值及依據校正後之第三原色邊界值與一先前第三原色邊界值輸出一第三原色過驅動灰階值。資料驅動單元依據第一原色過驅動灰階值、第二原色過驅動灰階值及第三原色過驅動灰階值驅動相對應之畫素。According to a fourth aspect of the present invention, a liquid crystal display comprising a liquid crystal panel, a scan driving unit, a white balance unit, a conversion unit, a correction unit, an overdrive unit, and a data drive unit is provided. The liquid crystal panel has a plurality of pixels. The white balance unit receives a first primary color grayscale value, a second primary color grayscale value, and a third primary color grayscale value. The white balance unit corrects the second primary color grayscale value and the third primary color grayscale value according to a white balance lookup table, wherein the white balance lookup table is established according to the first primary color grayscale value. Converting, according to a first primary color limit, converting the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value to a first primary color boundary value, a second primary color boundary value, and A third primary color boundary value. The correcting unit corrects the second primary color boundary value and the third primary color boundary value respectively according to the white balance lookup table. The overdrive unit is based on the first primary color boundary value and a previous first primary color boundary The value outputs a first primary color overdrive grayscale value, outputs a second primary color overdrive grayscale value according to the corrected second primary color boundary value and a previous second primary color boundary value, and according to the corrected third primary color boundary value and The previous third primary color boundary value outputs a third primary color overdrive grayscale value. The data driving unit drives the corresponding pixel according to the first primary color overdrive grayscale value, the second primary color overdrive grayscale value, and the third primary color overdrive grayscale value.
為讓本發明之上述內容能更明顯易懂，下文特舉一較佳實施例，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, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:
本發明提供一種液晶面板驅動方法及液晶顯示器，改進液晶面板之過驅動方法，透過白平衡查閱表的對應，由第一原色界限得到第二原色界限及第三原色界限，進而得到修正後之第一原色過驅動灰階值、第二原色過驅動灰階值及第三原色過驅動灰階值，使得液晶顯示器能夠同時應用過驅動技術及白平衡技術，而不會產生色斑。The invention provides a liquid crystal panel driving method and a liquid crystal display, and improves the overdriving method of the liquid crystal panel. Through the correspondence of the white balance look-up table, the second primary color limit and the third primary color limit are obtained from the first primary color limit, thereby obtaining the corrected first The primary color overdrive grayscale value, the second primary color overdrive grayscale value, and the third primary color overdrive grayscale value enable the liquid crystal display to simultaneously apply overdrive technology and white balance technology without causing color spots.
茲以第一原色、第二原色及第三原色分別為綠色、紅色及藍色為例做說明。請參照第3圖，其繪示依照本發明較佳實施例之白平衡查閱表、綠色界限、紅色界限及藍色界限之對應關係圖。由於液晶分子的光學特性為非線性，故綠色界限是以非線性方式作切割。透過白平衡查閱表的對應，針對綠色界限非均勻切割的架構得到紅色界限及藍色界限。The first primary color, the second primary color, and the third primary color are respectively illustrated as green, red, and blue. Please refer to FIG. 3, which illustrates a correspondence diagram of a white balance look-up table, a green limit, a red limit, and a blue limit in accordance with a preferred embodiment of the present invention. Since the optical properties of liquid crystal molecules are nonlinear, the green limit is cut in a nonlinear manner. Through the correspondence of the white balance look-up table, the red limit and the blue limit are obtained for the non-uniform cut structure of the green limit.
請參照第4圖，其繪示乃依照本發明第一實施例之液晶顯示器之示意圖。液晶顯示器600包括液晶面板610、掃描驅動單元615、白平衡單元620、轉換單元630、暫存器640、過驅動單元650以及資料驅動單元660。液晶面板610具有多個畫素(未繪示於圖)。掃描驅動單元615用以控制該些畫素。Please refer to FIG. 4, which is a schematic diagram of a liquid crystal display according to a first embodiment of the present invention. The liquid crystal display 600 includes a liquid crystal panel 610, a scan driving unit 615, a white balance unit 620, a conversion unit 630, a register 640, an overdrive unit 650, and a data drive unit 660. The liquid crystal panel 610 has a plurality of pixels (not shown). The scan driving unit 615 is configured to control the pixels.
白平衡單元620接收一三原色訊號CS，三原色訊號CS包括一第一原色灰階值、一第二原色灰階值及一第三原色灰階值。白平衡單元620依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，此白平衡查閱表係以第一原色灰階值為基準而建立。其中，第一原色灰階值例如為綠色灰階值，第二原色灰階值及第三原色灰階值例如為紅色灰階值及藍色原色灰階值，然不限於此。The white balance unit 620 receives a three primary color signal CS, and the three primary color signals CS include a first primary color grayscale value, a second primary color grayscale value, and a third primary color grayscale value. The white balance unit 620 corrects the second primary color grayscale value and the third primary color grayscale value according to a white balance lookup table, and the white balance lookup table is established based on the first primary color grayscale value. The first primary color grayscale value is, for example, a green grayscale value, and the second primary color grayscale value and the third primary color grayscale value are, for example, a red grayscale value and a blue primary color grayscale value, but are not limited thereto.
轉換單元630包括第一轉換單元632、第二轉換單元634以及第三轉換單元636。第一轉換單元632依據一第一原色界限轉換第一原色灰階值為一第一原色邊界值。第二轉換單元634依據一第二原色界限轉換經白平衡單元620校正後之第二原色灰階值為一第二原色邊界值。第三轉換單元636依據一第三原色界限轉換經白平衡單元620校正後之第三原色灰階值為一第三原色邊界值。其中，第二原色界限及第三原色界限係依據白平衡查閱表及第一原色界限而得到。因為依據不同的界限分別轉換相對應之不同原色灰階值，故可修正傳統依據單元界限轉換不同原 色灰階值可能會產生之錯誤。The conversion unit 630 includes a first conversion unit 632, a second conversion unit 634, and a third conversion unit 636. The first converting unit 632 converts the first primary color grayscale value to a first primary color boundary value according to a first primary color limit. The second conversion unit 634 converts the second primary color grayscale value corrected by the white balance unit 620 according to a second primary color limit value to a second primary color boundary value. The third conversion unit 636 converts the third primary color grayscale value corrected by the white balance unit 620 according to a third primary color limit value to a third primary color boundary value. The second primary color limit and the third primary color limit are obtained according to the white balance look-up table and the first primary color limit. Because the corresponding primary gray scale values are respectively converted according to different limits, the traditional unit boundary conversion can be modified to different originals. Color grayscale values can produce errors.
暫存器640係耦接至轉換單元630，用以儲存第一原色邊界值、第二原色邊界值及第三原色邊界值。其中，第一原色邊界值、第二原色邊界值及第三原色邊界值實質上係對應於一當前影像畫面。此外，暫存器640亦儲存一先前第一原色邊界值、一先前第二原色邊界值及一先前第三原色邊界值，先前第一原色邊界值、先前第二原色邊界值及先前第三原色邊界值實質上係對應於一先前影像畫面。The register 640 is coupled to the conversion unit 630 for storing the first primary color boundary value, the second primary color boundary value, and the third primary color boundary value. The first primary color boundary value, the second primary color boundary value, and the third primary color boundary value substantially correspond to a current image frame. In addition, the register 640 also stores a previous first primary color boundary value, a previous second primary color boundary value, and a previous third primary color boundary value, a previous first primary color boundary value, a previous second primary color boundary value, and a previous third primary color boundary value. Essentially corresponds to a previous image frame.
過驅動單元650包括第一過驅動電路652、第二過驅動電路654以及第三過驅動電路656。第一過驅動電路652耦接至轉換單元630及暫存器640，依據第一原色邊界值與先前第一原色邊界值，從一第一原色過驅動界限查閱表得到一第一原色過驅動灰階值。第二過驅動電路654耦接至轉換單元630及暫存器640，依據第二原色邊界值與先前第二原色邊界值，從一第二原色過驅動界限查閱表得到一第二原色過驅動灰階值。The overdrive unit 650 includes a first overdrive circuit 652, a second overdrive circuit 654, and a third overdrive circuit 656. The first overdrive circuit 652 is coupled to the conversion unit 630 and the register 640 to obtain a first primary color overdrive gray from a first primary color overdrive limit lookup table according to the first primary color boundary value and the previous first primary color boundary value. Order value. The second overdrive circuit 654 is coupled to the conversion unit 630 and the register 640, and obtains a second primary color overdrive gray from a second primary color overdrive limit lookup table according to the second primary color boundary value and the previous second primary color boundary value. Order value.
第三過驅動電路656耦接至轉換單元630及暫存器640，依據第三原色邊界值與先前第三原色邊界值，從一第三原色過驅動界限查閱表得到一第三原色過驅動灰階值。資料驅動單元660耦接至過驅動單元650，並依據第一原色過驅動灰階值、第二原色過驅動灰階值以及第三原色過驅動灰階值驅動液晶面板610上相對應之畫素。The third overdrive circuit 656 is coupled to the conversion unit 630 and the register 640 to obtain a third primary color overdrive grayscale value from a third primary color overdrive limit lookup table according to the third primary color boundary value and the previous third primary color boundary value. The data driving unit 660 is coupled to the over driving unit 650, and drives the corresponding pixels on the liquid crystal panel 610 according to the first primary color overdrive grayscale value, the second primary color overdrive grayscale value, and the third primary color overdrive grayscale value.
茲以第一原色、第二原色及第三原色分別為綠色、紅色及藍色，且先前灰階值(R,G,B)為(19,19,19)及目前灰 階值(R,G,B)為(32,32,32)為例做說明。對三原色訊號進行白平衡的處理後，則先前灰階值(R,G,B)例如轉換為(22,19,15)，目前灰階值(R,G,B)例如轉換為(37,32,26)。請參照第5A圖、第5B圖及第5C圖，第5A圖繪示依照本發明第一實施例之紅色過驅動界限查閱表之示意圖，第5B圖繪示依照本發明第一實施例之綠色過驅動界限查閱表之示意圖，第5C圖繪示依照本發明第一實施例之藍色過驅動界限查閱表之示意圖。由第5A圖、第5B圖及第5C圖中可以得知，分別使用三個不同的過驅動界限查閱表後得到的過驅動灰階值係一致。The first primary color, the second primary color, and the third primary color are respectively green, red, and blue, and the previous grayscale values (R, G, B) are (19, 19, 19) and the current gray The order value (R, G, B) is (32, 32, 32) as an example. After white balance processing of the three primary color signals, the previous grayscale value (R, G, B) is converted to (22, 19, 15), for example, and the current grayscale value (R, G, B) is converted to (37, for example). 32, 26). Please refer to FIG. 5A, FIG. 5B and FIG. 5C. FIG. 5A is a schematic diagram of a red overdrive limit lookup table according to a first embodiment of the present invention, and FIG. 5B is a view showing a green according to the first embodiment of the present invention. A schematic diagram of an overdrive limit lookup table, and FIG. 5C is a schematic diagram of a blue overdrive limit lookup table in accordance with a first embodiment of the present invention. It can be seen from Fig. 5A, Fig. 5B and Fig. 5C that the overdrive gray scale values obtained after using the three different overdrive limit lookup tables are consistent.
亦即，白平衡處理完後之三原色訊號，其所對應之紅色過驅動灰階值、綠色過驅動灰階值及藍色過驅動灰階值會一致。請參照第6圖，其繪示依照本發明第一實施例之應用白平衡技術及過驅動技術之一例之示意圖。因為紅色過驅動灰階值、綠色過驅動灰階值及藍色過驅動灰階值一致，故相對應之時間亮度曲線相同，相對應之液晶分子之反應時間一致。That is to say, after the white balance processing, the three primary color signals, the corresponding red overdrive grayscale value, the green overdrive grayscale value and the blue overdrive grayscale value will be consistent. Please refer to FIG. 6 , which is a schematic diagram showing an example of applying a white balance technique and an overdrive technique according to a first embodiment of the present invention. Because the red overdrive grayscale value, the green overdrive grayscale value, and the blue overdrive grayscale value are the same, the corresponding time luminance curve is the same, and the corresponding liquid crystal molecules have the same reaction time.
本實施例亦揭露一種液晶面板驅動方法，請參照第7圖，其繪示乃依照本發明第一實施例之液晶面板驅動方法之流程圖。首先，於步驟900中，接收一三原色訊號，三原色訊號包括一第一原色灰階值、一第二原色灰階值及一第三原色灰階值。接著，於步驟910中，依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，白平衡查閱表係以第一原色灰階值為基準而建立。This embodiment also discloses a liquid crystal panel driving method. Referring to FIG. 7, a flow chart of a liquid crystal panel driving method according to a first embodiment of the present invention is shown. First, in step 900, a three primary color signals are received. The three primary color signals include a first primary color grayscale value, a second primary color grayscale value, and a third primary color grayscale value. Next, in step 910, the second primary color grayscale value and the third primary color grayscale value are corrected according to a white balance lookup table, and the white balance lookup table is established based on the first primary color grayscale value.
於步驟920中，依據白平衡查閱表及一第一原色界限(boundary)得到一第二原色界限及一第三原色界限。然後，於步驟930中，分別依據第一原色界限、第二原色界限及第三原色界限，轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。接著，於步驟940中，儲存第一原色邊界值、第二原色邊界值及第三原色邊界值。In step 920, a second primary color limit and a third primary color limit are obtained according to the white balance lookup table and a first primary color boundary. Then, in step 930, the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value are converted according to the first primary color limit, the second primary color limit, and the third primary color limit, respectively. a first primary color boundary value, a second primary color boundary value, and a third primary color boundary value. Next, in step 940, the first primary color boundary value, the second primary color boundary value, and the third primary color boundary value are stored.
之後，於步驟950中，分別依據第一原色邊界值與一先前第一原色邊界值、第二原色邊界值與一先前第二原色邊界值、及第三原色邊界值與一先前第三原色邊界值，從一第一原色過驅動界限查閱表、一第二原色過驅動界限查閱表及一第三原色過驅動界限查閱表得到一第一原色過驅動灰階值、一第二原色過驅動灰階值及一第三原色過驅動灰階值，以驅動液晶面板上相對應之畫素。Then, in step 950, according to the first primary color boundary value and a previous first primary color boundary value, the second primary color boundary value and a previous second primary color boundary value, and the third primary color boundary value and a previous third primary color boundary value, Obtaining a first primary color overdrive grayscale value, a second primary color overdrive grayscale value, and a first primary color overdrive limit lookup table and a third primary color overdrive limit lookup table from a first primary color overdrive limit lookup table and A third primary color overdrives the grayscale value to drive the corresponding pixel on the liquid crystal panel.
本發明第一實施例所揭露之液晶面板驅動方法及液晶顯示器，係依據白平衡查閱表修正第一原色界限而得到第二原色界限及第三原色界限。如此一來，當三原色訊號之第一原色灰階值、第二原色灰階值及第三原色灰階值相同時，三原色訊號之第一原色過驅動灰階值、第二原色過驅動灰階值及第三原色過驅動灰階值一致，相對應之時間亮度曲線相同，故相對應之液晶分子之反應時間一致，達到避免色斑產生的目的。The liquid crystal panel driving method and the liquid crystal display disclosed in the first embodiment of the present invention correct the first primary color limit according to the white balance lookup table to obtain the second primary color limit and the third primary color limit. In this way, when the first primary color grayscale value, the second primary color grayscale value, and the third primary color grayscale value of the three primary color signals are the same, the first primary color of the three primary color signals exceeds the driving grayscale value and the second primary color overdrives the grayscale value. And the third primary color overdrive gray scale value is the same, the corresponding time brightness curve is the same, so the reaction time of the corresponding liquid crystal molecules is consistent, to achieve the purpose of avoiding the generation of color spots.
請參照第8圖，其繪示乃依照本發明第二實施例之液晶顯示器之示意圖。液晶顯示器1000包括液晶面板1010、掃描驅動單元1015、白平衡單元1020、轉換單元1030、校正單元1040、暫存器1050、過驅動單元1060以及資料驅動單元1070。液晶面板1010具有多個畫素(未繪示於圖)。掃描驅動單元1015用以控制該些畫素。Please refer to FIG. 8 , which is a schematic diagram of a liquid crystal display according to a second embodiment of the present invention. The liquid crystal display 1000 includes a liquid crystal panel 1010, a scan driving unit 1015, a white balance unit 1020, a conversion unit 1030, a correction unit 1040, a register 1050, an overdrive unit 1060, and a material drive unit 1070. The liquid crystal panel 1010 has a plurality of pixels (not shown). The scan driving unit 1015 is configured to control the pixels.
白平衡單元1020接收一三原色訊號CS，三原色訊號CS包括一第一原色灰階值、一第二原色灰階值及一第三原色灰階值。白平衡單元1020依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，此白平衡查閱表係以第一原色灰階值為基準。其中，第一原色灰階值例如為綠色灰階值，第二原色灰階值及第三原色灰階值例如為紅色灰階值及藍色原色灰階值，然不限於此。The white balance unit 1020 receives a three primary color signal CS, and the three primary color signals CS include a first primary color grayscale value, a second primary color grayscale value, and a third primary color grayscale value. The white balance unit 1020 corrects the second primary color grayscale value and the third primary color grayscale value according to a white balance lookup table, and the white balance lookup table is based on the first primary color grayscale value. The first primary color grayscale value is, for example, a green grayscale value, and the second primary color grayscale value and the third primary color grayscale value are, for example, a red grayscale value and a blue primary color grayscale value, but are not limited thereto.
轉換單元1030依據一第一原色界限，轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。校正單元1040依據白平衡查閱表，分別校正第二原色邊界值及第三原色邊界值。如此一來，轉換單元1030依據單一界限轉換不同原色灰階值可能會產生之錯誤係被修正。The converting unit 1030 converts the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value to a first primary color boundary value and a second primary color boundary value according to a first primary color limit. And a third primary color boundary value. The correcting unit 1040 corrects the second primary color boundary value and the third primary color boundary value respectively according to the white balance lookup table. As a result, the conversion unit 1030 may correct the error caused by converting different primary color grayscale values according to a single limit.
暫存器1050儲存第一原色邊界值、校正後之第二原色邊界值及校正後之第三原色邊界值。其中，第一原色邊界值、校正後之第二原色邊界值及校正後之第三原色邊界 值實質上係對應於一當前影像畫面。此外，暫存器1050亦暫存一先前第一原色邊界值、一先前第二原色邊界值及一先前第三原色邊界值，先前第一原色邊界值、先前第二原色邊界值及先前第三原色邊界值實質上係對應於一先前影像畫面。The register 1050 stores the first primary color boundary value, the corrected second primary color boundary value, and the corrected third primary color boundary value. Wherein, the first primary color boundary value, the corrected second primary color boundary value, and the corrected third primary color boundary The value essentially corresponds to a current image frame. In addition, the register 1050 also temporarily stores a previous first primary color boundary value, a previous second primary color boundary value, and a previous third primary color boundary value, the previous first primary color boundary value, the previous second primary color boundary value, and the previous third primary color boundary. The value essentially corresponds to a previous image frame.
過驅動單元1060包括第一過驅動電路1062、第二過驅動電路1064以及第三過驅動電路1066。第一過驅動電路1062耦接至校正單元1040及暫存器1050，依據第一原色邊界值與先前第一原色邊界值，從一第一原色過驅動界限查閱表得到一第一原色過驅動灰階值。第二過驅動電路1064耦接至校正單元1040及暫存器1050，依據校正後之第二原色邊界值與先前第二原色邊界值，從一第二原色過驅動界限查閱表得到一第二原色過驅動灰階值。The overdrive unit 1060 includes a first overdrive circuit 1062, a second overdrive circuit 1064, and a third overdrive circuit 1066. The first overdrive circuit 1062 is coupled to the correction unit 1040 and the register 1050, and obtains a first primary color overdrive gray from a first primary color overdrive limit lookup table according to the first primary color boundary value and the previous first primary color boundary value. Order value. The second overdrive circuit 1064 is coupled to the correction unit 1040 and the register 1050, and obtains a second primary color from a second primary color overdrive limit lookup table according to the corrected second primary color boundary value and the previous second primary color boundary value. Overdrive grayscale value.
第三過驅動電路1066耦接至校正單元1040及暫存器1050，依據校正後之第三原色邊界值與先前第三原色邊界值，從一第三原色過驅動界限查閱表得到一第三原色過驅動灰階值。資料驅動單元1070耦接至過驅動單元1060，並依據第一原色過驅動灰階值、第二原色過驅動灰階值以及第三原色過驅動灰階值驅動液晶面板1010上相對應之畫素。The third overdrive circuit 1066 is coupled to the correction unit 1040 and the register 1050, and obtains a third primary color overdrive gray scale from a third primary color overdrive limit lookup table according to the corrected third primary color boundary value and the previous third primary color boundary value. value. The data driving unit 1070 is coupled to the over driving unit 1060, and drives the corresponding pixels on the liquid crystal panel 1010 according to the first primary color overdrive grayscale value, the second primary color overdrive grayscale value, and the third primary color overdrive grayscale value.
本實施例亦揭露另一種液晶顯示面板驅動方法，請參照第9圖，其繪示乃依照本發明第二實施例之液晶面板驅動方法之流程圖。首先，於步驟1100中，接收一三原色訊號，三原色訊號包括一第一原色灰階值、一第二原色灰 階值及一第三原色灰階值。接著，於步驟1110中，依據一白平衡查閱表校正第二原色灰階值及第三原色灰階值，白平衡查閱表係以第一原色灰階值為基準而建立。This embodiment also discloses another liquid crystal display panel driving method. Referring to FIG. 9, a flow chart of a liquid crystal panel driving method according to a second embodiment of the present invention is shown. First, in step 1100, a primary color signal is received, and the three primary color signals include a first primary color grayscale value and a second primary color gray. The order value and a third primary color gray scale value. Next, in step 1110, the second primary color grayscale value and the third primary color grayscale value are corrected according to a white balance lookup table, and the white balance lookup table is established based on the first primary color grayscale value.
於步驟1120中，依據一第一原色界限轉換第一原色灰階值、校正後之第二原色灰階值及校正後之第三原色灰階值為一第一原色邊界值、一第二原色邊界值及一第三原色邊界值。然後，於步驟1130中，依據白平衡查閱表，分別校正第二原色邊界值及第三原色邊界值。接著，於步驟1140中，儲存第一原色邊界值、校正後之第二原色邊界值及校正後之第三原色邊界值。In step 1120, converting the first primary color grayscale value, the corrected second primary color grayscale value, and the corrected third primary color grayscale value to a first primary color boundary value and a second primary color boundary according to a first primary color limit. Value and a third primary color boundary value. Then, in step 1130, the second primary color boundary value and the third primary color boundary value are respectively corrected according to the white balance lookup table. Next, in step 1140, the first primary color boundary value, the corrected second primary color boundary value, and the corrected third primary color boundary value are stored.
之後，於步驟1150中，分別依據第一原色邊界值與一先前第一原色邊界值、校正後之第二原色邊界值與一先前第二原色邊界值、及校正後之第三原色邊界值與一先前第三原色邊界值，從一第一原色過驅動界限查閱表、一第二原色過驅動界限查閱表及一第三原色過驅動界限查閱表得到一第一原色過驅動灰階值、一第二原色過驅動灰階值及一第三原色過驅動灰階值，以驅動液晶面板上相對應之畫素。Then, in step 1150, according to the first primary color boundary value and a previous first primary color boundary value, the corrected second primary color boundary value and a previous second primary color boundary value, and the corrected third primary color boundary value and a corrected The first primary color boundary value, a first primary color overdrive limit lookup table, a second primary color overdrive limit lookup table, and a third primary color overdrive limit lookup table to obtain a first primary color overdrive grayscale value, a second primary color The overdrive grayscale value and a third primary color overdrive grayscale value are used to drive the corresponding pixels on the liquid crystal panel.
本發明第二實施例所揭露之液晶面板驅動方法及液晶顯示器，係透過白平衡查閱表之即時映射，以校正依據第一原色界限得到之第二原色邊界值及第三原色邊界值。如此一來，當三原色訊號之第一原色灰階值、第二原色灰階值及第三原色灰階值相同時，三原色訊號之第一原色過驅動灰階值、第二原色過驅動灰階值及第三原色過驅 動灰階值所產生之過驅動能力一致，相對應之時間亮度曲線相同，故相對應之液晶分子之反應時間一致，達到避免色斑產生的目的。The liquid crystal panel driving method and the liquid crystal display disclosed in the second embodiment of the present invention are used to correct the second primary color boundary value and the third primary color boundary value obtained according to the first primary color limit through the instant mapping of the white balance lookup table. In this way, when the first primary color grayscale value, the second primary color grayscale value, and the third primary color grayscale value of the three primary color signals are the same, the first primary color of the three primary color signals exceeds the driving grayscale value and the second primary color overdrives the grayscale value. And the third primary color overdrive The dynamic driving force has the same over-driving ability, and the corresponding time brightness curve is the same, so the reaction time of the corresponding liquid crystal molecules is the same, so as to avoid the generation of color spots.
綜上所述，雖然本發明已以一較佳實施例揭露如上，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 view of the above, the present invention has been disclosed in a preferred embodiment, and 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.
300、600、1000‧‧‧液晶顯示器300, 600, 1000‧‧‧ liquid crystal display
310、610、1010‧‧‧液晶面板310, 610, 1010‧‧‧ LCD panel
315、615、1015‧‧‧掃描驅動單元315, 615, 1015‧‧‧ scan drive unit
320、620、1020‧‧‧白平衡單元320, 620, 1020‧‧‧ white balance unit
340、640、1050‧‧‧暫存器340, 640, 1050‧‧‧ register
350、650、1060‧‧‧過驅動單元350, 650, 1060‧‧‧ overdrive unit
360、660、1070‧‧‧資料驅動單元360, 660, 1070‧‧‧ data drive unit
630、1030‧‧‧轉換單元630, 1030‧‧‧ conversion unit
632‧‧‧第一轉換單元632‧‧‧First conversion unit
634‧‧‧第二轉換單元634‧‧‧Second conversion unit
636‧‧‧第三轉換單元636‧‧‧ Third conversion unit
652、1062‧‧‧第一過驅動電路652, 1062‧‧‧ first overdrive circuit
654、1064‧‧‧第二過驅動電路654, 1064‧‧‧Second overdrive circuit
656、1066‧‧‧第三過驅動電路656, 1066‧‧‧ third overdrive circuit
1040‧‧‧校正單元1040‧‧‧Correction unit
第1圖繪示傳統液晶顯示器之示意圖。FIG. 1 is a schematic view showing a conventional liquid crystal display.
第2圖繪示傳統白平衡技術及過驅動技術之一例之示意圖。FIG. 2 is a schematic diagram showing an example of a conventional white balance technique and an overdrive technique.
第3圖繪示依照本發明較佳實施例之白平衡查閱表、綠色界限、紅色界限及藍色界限之對應關係圖。Figure 3 is a diagram showing the correspondence relationship between the white balance look-up table, the green limit, the red limit, and the blue limit in accordance with a preferred embodiment of the present invention.
第4圖繪示依照本發明第一實施例之液晶顯示器之示意圖。4 is a schematic view showing a liquid crystal display according to a first embodiment of the present invention.
第5A圖繪示依照本發明第一實施例之紅色過驅動界限查閱表之示意圖。FIG. 5A is a schematic diagram showing a red overdrive limit lookup table in accordance with a first embodiment of the present invention.
第5B圖繪示依照本發明第一實施例之綠色過驅動界限查閱表之示意圖。FIG. 5B is a schematic diagram showing a green overdrive limit lookup table according to the first embodiment of the present invention.
第5C圖繪示依照本發明第一實施例之藍色過驅動界限查閱表之示意圖。FIG. 5C is a schematic diagram showing a blue overdrive limit lookup table according to the first embodiment of the present invention.
第6圖繪示依照本發明第一實施例之應用白平衡技術及過驅動技術之一例之示意圖。FIG. 6 is a schematic diagram showing an example of applying a white balance technique and an overdrive technique according to the first embodiment of the present invention.
第7圖繪示依照本發明第一實施例之液晶面板驅動方法之流程圖。FIG. 7 is a flow chart showing a driving method of a liquid crystal panel according to a first embodiment of the present invention.
第8圖繪示依照本發明第二實施例之液晶顯示器之示意圖。FIG. 8 is a schematic view showing a liquid crystal display according to a second embodiment of the present invention.
第9圖繪示依照本發明第二實施例之液晶面板驅動方法之流程圖。FIG. 9 is a flow chart showing a driving method of a liquid crystal panel according to a second embodiment of the present invention.
600‧‧‧液晶顯示器600‧‧‧LCD display
610‧‧‧液晶面板610‧‧‧LCD panel
615‧‧‧掃描驅動單元615‧‧‧ scan drive unit
620‧‧‧白平衡單元620‧‧‧White balance unit
630‧‧‧轉換單元630‧‧‧ conversion unit
632‧‧‧第一轉換單元632‧‧‧First conversion unit
634‧‧‧第二轉換單元634‧‧‧Second conversion unit
636‧‧‧第三轉換單元636‧‧‧ Third conversion unit
640‧‧‧暫存器640‧‧‧ register
650‧‧‧過驅動單元650‧‧‧Overdrive unit
652‧‧‧第一過驅動電路652‧‧‧First overdrive circuit
654‧‧‧第二過驅動電路654‧‧‧Second overdrive circuit
656‧‧‧第三過驅動電路656‧‧‧ Third overdrive circuit
660‧‧‧資料驅動單元660‧‧‧Data Drive Unit
Claims (17)
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| US20030080931A1 (en) * | 2001-10-25 | 2003-05-01 | Li-Yi Chen | Apparatus for converting a digital signal to an analog signal for a pixel in a liquid crystal display and method therefor |
| TW200512710A (en) * | 2003-08-22 | 2005-04-01 | Koninkl Philips Electronics Nv | System for driving inertia-prone picture-reproducing devices |
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