TWI433125B - Over drive display method and circuit using thereof - Google Patents
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本發明是有關於一種過驅動(Over Drive)方法,且特別是一種經由提升液晶顯示器(Liquid Crystal Display,LCD)中紅色液晶分子的旋轉速度來達到較佳之過驅動顯示效果的過驅動方法。 The present invention relates to an overdrive method, and more particularly to an overdrive method for achieving a better overdriving display effect by increasing the rotational speed of red liquid crystal molecules in a liquid crystal display (LCD).
在科技發展日新月異的現今時代中,過驅動(Over Drive)顯示技術係已經被開發出來,以加快液晶顯示器(Liquid Crystal Display,LCD)中液晶分子的旋轉速度,藉此達到提升LCD顯示畫面之畫質的技術效果。在現有技術中,過驅動顯示技術係以時間域查表(Lookup Table),來根據前後兩筆圖框資料中對應至相同位置之次畫素資料(例如是紅色、綠色及藍色次畫素資料)找出對應之一筆過驅動次畫素資料。 In today's fast-changing technology era, Over Drive display technology has been developed to speed up the rotation of liquid crystal molecules in liquid crystal displays (LCDs), thereby improving the LCD display. Quality technical effects. In the prior art, the overdrive display technology uses a time domain lookup table to select sub-pixel data corresponding to the same position in the two frames of data before and after (for example, red, green, and blue sub-pixels). Data) Find out the corresponding one-pass drive sub-pixel data.
然而在現有技術中,前述時間域查表係針對一般常溫(例如是攝氏25度)的操作環境來進行相關之建立。若使用者在較低溫度(例如是攝氏10度左右)的環境中使用LCD,則液晶分子之旋轉速度因為溫度較低而變得更為緩慢,這樣一來,即便我們使用過驅動次畫素資料來對LCD驅動,LCD顯示畫面之品質仍可能因為為液晶分子旋轉速度不夠快而降低。如此,如何設計出可在低溫環境中提升液晶分子旋轉速度之驅動方法,為業界不斷致力的方向之一。 However, in the prior art, the aforementioned time domain lookup table is related to the establishment of an operating environment at a normal temperature (for example, 25 degrees Celsius). If the user uses the LCD in a low temperature environment (for example, about 10 degrees Celsius), the rotation speed of the liquid crystal molecules becomes slower because of the lower temperature, so that even if we use the driving sub-pixels According to the data, the quality of the LCD display may still be reduced because the liquid crystal molecules are not rotating fast enough. In this way, how to design a driving method that can increase the rotational speed of liquid crystal molecules in a low temperature environment is one of the directions that the industry is constantly striving for.
本發明係有關於一種過驅動(Over Drive)方法,其係判斷液晶顯示器(Liquid Crystal Display,LCD)欲顯示之影像資料是否對應至人臉影像條件,並據以選擇性地提升此影像資料中紅色次畫素資料的灰階值,使得LCD具有良好之畫面顯示品質。據此,相較於傳統過驅動方法,本發明相關之過驅動方法可有效地在低溫操作環境中更進一步提升LCD中液晶分子的旋轉速度,並對應地提供較佳之畫面顯示品質。 The present invention relates to an overdrive method for determining whether an image data to be displayed by a liquid crystal display (LCD) corresponds to a face image condition, and thereby selectively enhancing the image data. The gray scale value of the red sub-pixel data makes the LCD have good picture display quality. Accordingly, the overdrive method of the present invention can effectively further increase the rotational speed of liquid crystal molecules in the LCD in a low temperature operating environment and correspondingly provide better picture display quality than the conventional overdrive method.
根據本發明之第一方面,提出一種過驅動顯示方法,參考第一及第二筆畫素資料產生過驅動畫素資料驅動液晶顯示器(Liquid Crystal Display,LCD),第一及第二筆畫素資料分別為第n及第n+1筆圖框資料中對應至相同位置之畫素資料,n為整數。過驅動方法包括下列步驟。首先找出第一畫素資料中之第一紅色、第一綠色及第一藍色次畫素資料。接著找出第二畫素資料中之第二紅色、第二綠色及第二藍色次畫素資料。然後參考第一及第二綠色次畫素資料找出綠色過驅動次畫素資料。接著參考第一及第二藍色次畫素資料找出藍色過驅動次畫素資料。然後參考第一紅色、綠色及藍色與第二紅色、綠色及藍色次畫素資料其中之至少四筆次畫素資料找出紅色過驅動次畫素資料。根據綠色、藍色及紅色過驅動次畫素資料得到過驅動畫素資料。 According to a first aspect of the present invention, an overdrive display method is provided, which generates a liquid crystal display (LCD) by referring to the first and second pixel data, and the first and second pixel data are respectively It is the pixel data corresponding to the same position in the nth and n+1th frame data, and n is an integer. The overdrive method includes the following steps. First, the first red, first green, and first blue sub-pixel data in the first pixel data are found. Then, the second red, second green, and second blue sub-pixel data in the second pixel data are found. Then refer to the first and second green sub-pixel data to find the green overdrive sub-pixel data. Then, the blue overdrive sub-pixel data is found by referring to the first and second blue sub-pixel data. Then refer to the first red, green and blue and the second red, green and blue sub-pixel data, at least four of the pixel data to find the red overdrive sub-pixel data. The driven pixel data is obtained based on the green, blue, and red overdrive sub-pixel data.
根據本發明之第二方面,提出一種過驅動電路,參考 第一及第二筆畫素資料產生過驅動畫素資料驅動LCD,第一及第二筆畫素資料分別為第n及第n+1筆圖框資料中對應至相同位置之畫素資料,n為整數。過驅動電路包括緩衝器、記憶體及控制器。緩衝器接收第n筆圖框資料並將其延遲一段圖框期間後輸出。記憶體儲存程式碼。控制器讀取程式碼以執行過驅動方法,其中包括下列步驟。首先找出第一畫素資料中之第一紅色、第一綠色及第一藍色次畫素資料。接著找出第二畫素資料中之第二紅色、第二綠色及第二藍色次畫素資料。然後參考第一及第二綠色次畫素資料找出綠色過驅動次畫素資料。接著參考第一及第二藍色次畫素資料找出藍色過驅動次畫素資料。然後參考第一紅色、綠色及藍色與第二紅色、綠色及藍色次畫素資料其中之至少四筆次畫素資料找出紅色過驅動次畫素資料。根據綠色、藍色及紅色過驅動次畫素資料得到過驅動畫素資料。 According to a second aspect of the present invention, an overdrive circuit is provided, reference The first and second pixel data are generated by driving the pixel data to drive the LCD, and the first and second pixel data are respectively pixel data corresponding to the same position in the nth and n+1th frame data, n is Integer. The overdrive circuit includes a buffer, a memory, and a controller. The buffer receives the nth frame data and delays it for a period of time after the frame is output. Memory storage code. The controller reads the code to perform the overdrive method, which includes the following steps. First, the first red, first green, and first blue sub-pixel data in the first pixel data are found. Then, the second red, second green, and second blue sub-pixel data in the second pixel data are found. Then refer to the first and second green sub-pixel data to find the green overdrive sub-pixel data. Then, the blue overdrive sub-pixel data is found by referring to the first and second blue sub-pixel data. Then refer to the first red, green and blue and the second red, green and blue sub-pixel data, at least four of the pixel data to find the red overdrive sub-pixel data. The driven pixel data is obtained based on the green, blue, and red overdrive sub-pixel data.
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:
本發明實施例之過驅動(Over Drive)方法係經由選擇性地提升欲顯示之影像資料中紅色次畫素資料的灰階值的方式,來提升液晶顯示器(Liquid Crystal Display,LCD)的畫面顯示品質。 The Over Drive method of the embodiment of the present invention enhances the screen display of a liquid crystal display (LCD) by selectively increasing the gray scale value of the red sub-pixel data in the image data to be displayed. quality.
請參照第1圖,其繪示依照本發明實施例之過驅動電 路的方塊圖。過驅動電路10用以接收訊號源12提供之影像資料Dv,並據以驅動液晶顯示器(Liquid Crystal Display,LCD)14顯示對應之影像。影像資料Dv中包括多筆圖框資料;舉例來說,影像資料Dv中之第n筆圖框資料Df_n及第n+1筆圖框資料Df_n+1分別包括畫素資料Dpx1及Dpx2,其中畫素資料Dpx1及Dpx2分別為第n筆及第n+1圖框資料Df_n及Df_n+1中對應至相同位置之畫素資料,如第2A及第2B圖所示。 Please refer to FIG. 1 , which illustrates an overdrive power according to an embodiment of the invention. The block diagram of the road. The overdrive circuit 10 is configured to receive the image data Dv provided by the signal source 12, and drive the liquid crystal display (LCD) 14 to display the corresponding image. The image data Dv includes a plurality of frame data; for example, the nth frame data Df_n and the n+1th frame data Df_n+1 in the image data Dv include pixel data Dpx1 and Dpx2, respectively. The prime data Dpx1 and Dpx2 are pixel data corresponding to the same position in the nth and n+1th frame data Df_n and Df_n+1, respectively, as shown in FIGS. 2A and 2B.
過驅動電路10包括緩衝器10a、記憶體10b及控制器10c。緩衝器10a接收第n筆圖框資料Df_n,並將其延遲一段圖框期間後輸出。記憶體10b儲存程式碼,控制器10c讀取此程式碼以執行過驅動方法。控制器10c所執行之過驅動方法例如具有第3圖所示之流程步驟(a)-(f)。 The overdrive circuit 10 includes a buffer 10a, a memory 10b, and a controller 10c. The buffer 10a receives the nth frame data Df_n and outputs it after delaying a frame period. The memory 10b stores the code, and the controller 10c reads the code to execute the overdrive method. The overdrive method performed by the controller 10c has, for example, flow steps (a)-(f) shown in FIG.
首先如步驟(a),控制器10c找出畫素資料Dpx1中之紅色、綠色及藍色次畫素資料Dpx1_r、Dpx1_g及Dpx1_b。接著如步驟(b),控制器10c找出畫素資料Dpx2中之紅色、綠色及藍色次畫素資料Dpx2_r、Dpx2_g及Dpx2_b。 First, as step (a), the controller 10c finds the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b in the pixel data Dpx1. Next, as in step (b), the controller 10c finds the red, green, and blue sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b in the pixel data Dpx2.
然後如步驟(c),控制器10c參考綠色次畫素資料Dpx1_g及Dpx2_g找出綠色過驅動次畫素資料Dod_g。舉例來說,控制器10c係根據記憶體10b中儲存之程式碼產生二維(Two Dimensional,2D)綠色過驅動查表(Lookup Table),並經由此2D綠色過驅動查表將前後兩筆對應至相同位置之綠色次畫素資料Dpx1_g及Dpx2_g映射至一筆對應之綠色過驅動次畫素資料Dod_g。 Then, as in step (c), the controller 10c refers to the green sub-pixel data Dpx1_g and Dpx2_g to find the green overdrive sub-pixel data Dod_g. For example, the controller 10c generates a two-dimensional (2D) green overdrive lookup table according to the code stored in the memory 10b, and correspondingly the two front and back through the 2D green overdrive lookup table. The green sub-pixel data Dpx1_g and Dpx2_g to the same position are mapped to a corresponding green overdrive sub-pixel data Dod_g.
接著如步驟(d),控制器10c參考藍色次畫素資料 Dpx1_b及Dpx2_b找出藍色過驅動次畫素資料Dod_b。舉例來說,控制器10c係根據記憶體10b中儲存之程式碼產生2D藍色過驅動查表,並經由此2D藍色過驅動查表將前後兩筆對應至相同位置之藍色次畫素資料映射至一筆對應之藍色過驅動次畫素資料Dod_b。 Then, as step (d), the controller 10c refers to the blue sub-pixel data. Dpx1_b and Dpx2_b find the blue overdrive sub-pixel data Dod_b. For example, the controller 10c generates a 2D blue overdrive lookup table according to the code stored in the memory 10b, and correspondingly the blue and white pixels corresponding to the same position through the 2D blue overdrive lookup table. The data is mapped to a corresponding blue overdrive sub-pixel data Dod_b.
然後如步驟(e),控制器10c參考紅色次畫素資料Dpx1_r與Dpx2_r、綠色次畫素資料Dpx1_g與Dpx2_g及藍色次畫素資料Dpx1_b與Dpx2_b其中之至少四筆次畫素資料,找出紅色過驅動次畫素資料Dod_r。舉例來說,控制器10c係根據記憶體10b中儲存之程式碼,產生一個四維(Four Dimensional,4D)至六維(Six Dimensional,6D)之紅色過驅動查表,並經由此紅色過驅動查表將前述至少四筆次畫素資料映射至一筆對應之紅色過驅動次畫素資料Dod_r。 Then, as step (e), the controller 10c refers to the red sub-pixel data Dpx1_r and Dpx2_r, the green sub-pixel data Dpx1_g and Dpx2_g, and the blue sub-pixel data Dpx1_b and Dpx2_b at least four of the pixel data to find out The red overdrive sub-pixel data Dod_r. For example, the controller 10c generates a four-dimensional (4D) to six-dimensional (6D) red overdrive lookup table according to the code stored in the memory 10b, and searches for the red overdrive by the red overdrive. The table maps the aforementioned at least four-time pixel data to a corresponding red overdrive sub-pixel data Dod_r.
之後如步驟(f),控制器10c根據綠色、藍色及紅色過驅動次畫素資料Dod_g、Dod_b及Dod_r產生過驅動畫素資料Dpx_od,並據以驅動LCD 14顯示對應之影像畫面。 Then, in step (f), the controller 10c generates the overdrive pixel data Dpx_od according to the green, blue, and red overdrive sub-pixel data Dod_g, Dod_b, and Dod_r, and drives the LCD 14 to display the corresponding image frame.
更詳細的說,前述第3圖所示之步驟(e)中更包括步驟(e1)-(e4),如第4圖所示。如步驟(e1),控制器10c根據紅色次畫素資料Dpx1_r及Dpx2_r找出中間次畫素資料Psxc。舉例來說,控制器10c係根據記憶體10b中儲存之程式碼產生相似於前述2D綠色及2D藍色過驅動查表之2D紅色過驅動查表,以將前後兩筆對應至相同位置之紅色次畫素資料Dpx1_r及Dpx2_r映射至一筆對應之中間次畫素資料Psxc。 In more detail, the step (e) shown in the above third embodiment further includes the steps (e1) to (e4) as shown in Fig. 4. In step (e1), the controller 10c finds the intermediate sub-pixel data Psxc based on the red sub-pixel data Dpx1_r and Dpx2_r. For example, the controller 10c generates a 2D red overdrive lookup table similar to the 2D green and 2D blue overdrive lookup table according to the code stored in the memory 10b to match the front and rear two pens to the red of the same position. The sub-pixel data Dpx1_r and Dpx2_r are mapped to a corresponding intermediate sub-pixel data Psxc.
接著如步驟(e2),控制器10c根據紅色、綠色及藍色次畫素資料Dpx1_r、Dpx1_g及Dpx1_b,判斷畫素資料Dpx1是否滿足人臉影像條件。當畫素資料Dpx1滿足此人臉影像條件時執行步驟(e3),控制器10c決定數值大於1之增益G1,並根據增益G1放大中間次畫素資料Psxc,以產生紅色過驅動次畫素資料Dod_r。當畫素資料Dpx1不滿足此人臉影像條件時執行步驟(e4),控制器10c設定增益G1對應至數值1,藉此以未放大之中間次畫素資料Psxc產生紅色過驅動次畫素資料Dod_r。 Next, as step (e2), the controller 10c determines whether the pixel data Dpx1 satisfies the face image condition based on the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b. When the pixel data Dpx1 satisfies the face image condition, step (e3) is executed, the controller 10c determines the gain G1 whose value is greater than 1, and enlarges the intermediate sub-pixel data Psxc according to the gain G1 to generate red overdrive sub-pixel data. Dod_r. When the pixel data Dpx1 does not satisfy the face image condition, step (e4) is performed, and the controller 10c sets the gain G1 to correspond to the value 1, thereby generating the red overdrive sub-pixel data with the unmagnified intermediate pixel data Psxc. Dod_r.
舉例來說,此人臉影像條件係以於第n筆圖框資料Df_n中之紅色、綠色及藍色次畫素資料Dpx1_r、Dpx1_g及Dpx1_b間之灰階值關係來界定。 For example, the face image condition is defined by the gray-scale value relationship between the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b in the n-th frame data Df_n.
在一個例子中,步驟(e2)中更包括步驟(e21)-(e25),如第5圖所示。首先如步驟(e21),控制器10c根據紅色及綠色次畫素資料Dpx1_r及Dpx1_g之灰階值計算灰階值參數Prg1。接著如步驟(e22),控制器10c根據紅色及藍色次畫素資料Dpx1_r及Dpx1_b之灰階值計算灰階值參數Prb1。在一個例子中,控制器10c係根據下列運算式,分別計算相關於紅色及綠色次畫素資料Dpx1_r及Dpx1_g間之灰階值比值的灰階值參數Prg1與相關於紅色及藍色次畫素資料Dpx1_r及Dpx1_b間之灰階值比值的灰階值參數Prb1:
然後如步驟(e23),控制器10c分別判斷灰階值參數Prg1是否落在第一參數區間及判斷灰階值參數Prb1是否落在第二參數區間,藉此判斷畫素資料Dpx1是否滿足此人臉影像條件。當灰階值參數Prg1落在此第一參數區間或灰階值參數Prb1落在此第二參數區間時執行步驟(e24),控制器10c判斷畫素資料Dpx1滿足此人臉影像條件;當灰階值參數Prg1落在此第一參數區間之外且灰階值參數Prb1落在此第二參數區間之外時執行步驟(e25),控制器10c判斷畫素資料Dpx1不滿足此人臉影像條件。 Then, as step (e23), the controller 10c determines whether the grayscale value parameter Prg1 falls within the first parameter interval and determines whether the grayscale value parameter Prb1 falls within the second parameter interval, thereby determining whether the pixel data Dpx1 satisfies the person. Face image conditions. When the grayscale value parameter Prg1 falls within the first parameter interval or the grayscale value parameter Prb1 falls within the second parameter interval, step (e24) is performed, and the controller 10c determines that the pixel data Dpx1 satisfies the face image condition; When the order value parameter Prg1 falls outside the first parameter interval and the gray-scale value parameter Prb1 falls outside the second parameter interval, step (e25) is performed, and the controller 10c determines that the pixel data Dpx1 does not satisfy the face image condition. .
舉例來說,控制器10c更建立分別用以將灰階值參數Prg1對應至增益Grg1及用以將灰階值參數Prb1對應至增益Grb1之兩個一維查表,並根據下列運算式來得到此增益G1及紅色次畫素資料Dod_r:G1=Grg1×Grb1 For example, the controller 10c further establishes two one-dimensional lookup tables respectively for assigning the grayscale value parameter Prg1 to the gain Grg1 and the grayscale value parameter Prb1 to the gain Grb1, respectively, according to the following expressions. This gain G1 and red sub-pixel data Dod_r: G1=Grg1×Grb1
Dod_r=G1×Psxc前述兩個一維(One Dimensional,1D)查表例如分別如第6A及第6B圖所示,而灰階值參數Prg1及增益Grg1間之1維查表對應關係及灰階值參數Prb1與增益Grb1間之1維查表對應關係可如第7A圖及第7B圖所示。其中此第一及此第二數值範圍分別對應至數值範圍L1-L3及11-13。 Dod_r=G1×Psxc The two one-dimensional (1D) look-up tables are as shown in FIGS. 6A and 6B, respectively, and the one-dimensional table correspondence between the gray-scale value parameter Prg1 and the gain Grg1 and the gray scale The one-dimensional table correspondence between the value parameter Prb1 and the gain Grb1 can be as shown in FIGS. 7A and 7B. The first and second ranges of values correspond to the range of values L1-L3 and 11-13, respectively.
舉例來說,此人臉影像條件為灰階值參數Prg1落在此第一數值範圍L1-L3之間或灰階值參數Prb1落在此第二數值範圍11-13之間之條件: C=(L1<Prg1<L3)∩(l1<Prb1<l3)其中C為人臉影像條件。 For example, the face image condition is a condition that the grayscale value parameter Prg1 falls between the first numerical range L1-L3 or the grayscale value parameter Prb1 falls between the second numerical range 11-13: C=(L1<Prg1<L3)∩(l1<Prb1<l3) where C is a face image condition.
當人臉影像條件C成立時,增益Grg1或Grb1將被對應至大於1之數值,而增益G1亦對應地具有大於1之數值。據此,控制器10c可根據數值大於1之增益G1來對中間次畫素資料Psxc放大得到紅色過驅動次畫素資料Dod_r。當人臉影像條件C不成立(即是灰階值參數Prg1對應至數值L0、L1及L3-L8其中之一且灰階值參數Prb1對應至數值10、11及13-18其中之一之情況)時,增益Grg1及Grb1均對應至數值1,據此,此時控制器10c根據數值等於1之增益G1(=Grg1×Grb1=1×1)來對中間次畫素資料Psxc放大,而提供實質上等於中間次畫素資料Psxc之紅色過驅動次畫素資料Dod_r。 When the face image condition C is established, the gain Grg1 or Grb1 will be corresponding to a value greater than 1, and the gain G1 correspondingly has a value greater than one. According to this, the controller 10c can enlarge the intermediate sub-pixel data Psxc according to the gain G1 whose value is greater than 1 to obtain the red overdrive sub-pixel data Dod_r. When the face image condition C does not hold (that is, the grayscale value parameter Prg1 corresponds to one of the values L0, L1, and L3-L8 and the grayscale value parameter Prb1 corresponds to one of the values 10, 11, and 13-18) At this time, the gains Grg1 and Grb1 all correspond to the value 1, and accordingly, the controller 10c enlarges the intermediate sub-pixel data Psxc according to the gain G1 (=Grg1 × Grb1 = 1 × 1) whose value is equal to 1 to provide substantial The red overdrive sub-pixel data Dod_r is equal to the intermediate sub-pixel data Psxc.
在本實施例中雖僅以此人臉影像條件以於第n筆圖框資料Df_n中之紅色、綠色及藍色次畫素資料Dpx1_r、Dpx1_g及Dpx1_b間之灰階值關係來界定的情形為例作說明,然,本實施例之過驅動電路10並不侷限於此。在另一個例子中,此人臉影像條件係以於第n+1筆圖框資料Df_n+1中之紅色、綠色及藍色次畫素資料Dpx2_r、Dpx2_g及Dpx2_b間之灰階值關係來界定,或同時以第n筆及第n+1筆圖框資料Df_n及Df_n+1中之六筆次畫素資料Dpx1_r、Dpx1_g、Dpx1_b、Dpx2_r、Dpx2_g及Dpx2_b間之灰階值關係來界定。 In the present embodiment, only the face image condition is defined by the gray-scale value relationship between the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b in the n-th frame data Df_n. For example, the overdrive circuit 10 of the present embodiment is not limited thereto. In another example, the face image condition is defined by the gray-scale value relationship between the red, green, and blue sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b in the n+1th frame data Df_n+1. Or, at the same time, the gray scale value relationship between the six-pixel data Dp_1_r, Dpx1_g, Dpx1_b, Dpx2_r, Dpx2_g, and Dpx2_b in the nth and n+1th frame data Df_n and Df_n+1 is defined.
更詳細的說,控制器10c亦可根據下列方程式,來實現以於第n+1筆圖框資料Df_n+1中之紅色、綠色及藍色
次畫素資料Dpx2_r、Dpx2_g及Dpx2_b間之灰階值關係來界定此人臉影像條件之過驅動方法:
G2=Grg2×Grb2 G2=Grg2×Grb2
Dod_r=G2×Psxc Dod_r=G2×Psxc
C=(L1'<Prg2<L3')∩(l1'<Prb2<l3')其中對應之方法流程圖如第8圖及第9圖所示;對應之兩個一維查表例如分別如第10A及第10B圖所示;灰階值參數Prg2及增益Grg2間之1維查表對應關係及灰階值參數Prb2與增益Grb2間之1維查表對應關係可如第11A圖及第11B圖所示。換言之,此時控制器10c應用之4D紅色查表係根據第n筆圖框資料Df_n中之紅色次畫素資料Dpx1_r、第n+1筆圖框資料Df_n+1中之紅色、綠色及藍色次畫素資料Dpx2_r、Dpx2_g及Dpx2_b來映射得到紅色過驅動次畫素資料Dod_r。 C=(L1'<Prg2<L3')∩(l1'<Prb2<l3') wherein the corresponding method flowchart is as shown in FIG. 8 and FIG. 9; the corresponding two one-dimensional lookup tables are respectively, for example, 10A and 10B; the 1D lookup table between the grayscale value parameter Prg2 and the gain Grg2 and the 1D lookup table between the grayscale value parameter Prb2 and the gain Grb2 can be as shown in Fig. 11A and Fig. 11B. Shown. In other words, the 4D red lookup table applied by the controller 10c at this time is based on the red sub-pixel data Dpx1_r in the nth frame data Df_n, the red, green and blue in the n+1th frame data Df_n+1. The sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b are mapped to obtain the red overdrive sub-pixel data Dod_r.
在另一個例子中,控制器10c亦可根據下列方程式,來實現同時以第n筆及第n+1筆圖框資料Df_n及Df_n+1中之六筆次畫素資料Dpx1_r、Dpx1_g、Dpx1_b、Dpx2_r、Dpx2_g及Dpx2_b間之灰階值關係來界定此人臉影像條件之過驅動方法:
G=Grg1×Grb1×Grg2×Grb2 G=Grg1×Grb1×Grg2×Grb2
Dod_r=G×Psxc Dod_r=G×Psxc
C=(L1<Prg1<L3)∩(l1<Prb1<l3)∩(L1'<Prg2<L3')∩(l'<Prb2<l3')換言之,此時控制器10c應用之6D紅色查表係根據第n筆圖框資料Df_n中之紅色、綠色及藍色次畫素資料Dpx1_r、Dpx1_g、Dpx1_b、第n+1筆圖框資料Df_n+1中之紅色、綠色及藍色次畫素資料Dpx2_r、Dpx2_g及Dpx2_b來映射得到紅色過驅動次畫素資料Dod_r。 C=(L1<Prg1<L3)∩(l1<Prb1<l3)∩(L1'<Prg2<L3')∩(l'<Prb2<l3') In other words, the controller 10c applies the 6D red lookup table at this time. According to the red, green, and blue sub-pixel data of the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, Dpx1_b, and n+1th frame data Df_n+1 in the n-th frame data Df_n Dpx2_r, Dpx2_g, and Dpx2_b are mapped to obtain red overdrive sub-pixel data Dod_r.
在本實施例中,雖僅以根據一張2D查表及兩張1D查表,來分別地根據紅色次畫素資料Dpx1_r及Dpx2_r查表得到中間次畫素資料Psxc、根據灰階值參數Prg1查表得到增益Grg1及根據灰階值參數Prb1查表得到增益Grb1的方式來實現出以4D查表來產生紅色過驅動次畫素資料Dod_r的情形為例作說明,然,本實施例之過驅動電路10並不侷限於此,而更可經由其他差表方法來實現出以4D查表產生紅色過驅動次畫素資料Dod_r之操作。 In the present embodiment, the intermediate sub-pixel data Psxc and the gray-scale value parameter Prg1 are obtained based on the red sub-pixel data Dpx1_r and Dpx2_r, respectively, based on a 2D look-up table and two 1D look-up tables. The table obtains the gain Grg1 and obtains the gain Grb1 according to the gray-scale value parameter Prb1 to obtain the gain of the red overdrive sub-pixel data Dod_r by using the 4D look-up table as an example. However, this embodiment has The driving circuit 10 is not limited thereto, and the operation of generating the red overdrive sub-pixel data Dod_r by the 4D look-up table can be realized through other difference table methods.
本實施例之過驅動方法係判斷LCD欲顯示之影像資料是否對應至此人臉影像條件,並據以選擇性地提升此影像資料中紅色次畫素資料的灰階值。據此,當應用本實施例之過驅動方法之LCD操作在溫度較低的環境時,其仍可經由選擇性地在欲顯示之影像資料滿足此人臉影像條件時更進一步地提高對應至紅色液晶分子的驅動電壓,藉此提升LCD的畫面顯示品質。據此,相較於傳統過驅動方法, 本實施例之過驅動方法可有效地在低溫操作環境中更進一步提升LCD中液晶分子的旋轉速度,並對應地提供較佳之畫面顯示品質。 The overdrive method of this embodiment determines whether the image data to be displayed by the LCD corresponds to the face image condition, and accordingly selectively increases the grayscale value of the red sub-pixel data in the image data. Accordingly, when the LCD to which the overdrive method of the present embodiment is applied is operated in a low temperature environment, it can still further improve the corresponding red color by selectively satisfying the face image condition when the image data to be displayed is satisfied. The driving voltage of the liquid crystal molecules, thereby improving the picture display quality of the LCD. Accordingly, compared to the conventional overdrive method, The overdrive method of the present embodiment can effectively further increase the rotational speed of liquid crystal molecules in the LCD in a low temperature operating environment, and correspondingly provide better picture display quality.
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.
12‧‧‧訊號源 12‧‧‧Signal source
10‧‧‧過驅動電路 10‧‧‧Overdrive circuit
14‧‧‧液晶顯示器 14‧‧‧LCD display
10a‧‧‧緩衝器 10a‧‧‧buffer
10b‧‧‧記憶體 10b‧‧‧ memory
10c‧‧‧控制器 10c‧‧‧ controller
第1圖繪示依照本發明實施例之過驅動電路的方塊圖。 1 is a block diagram of an overdrive circuit in accordance with an embodiment of the present invention.
第2A圖及第2B圖分別繪示第n及第n+1筆圖框資料Df_n及Df_n+1的示意圖。 2A and 2B are schematic diagrams showing the nth and n+1th frame data Df_n and Df_n+1, respectively.
第3圖繪示依照本發明實施例之過驅動方法的流程圖。 FIG. 3 is a flow chart showing an overdrive method in accordance with an embodiment of the present invention.
第4圖繪示依照本發明實施例之過驅動方法中步驟(e)的詳細流程圖。 4 is a detailed flow chart showing step (e) of the overdrive method in accordance with an embodiment of the present invention.
第5圖繪示依照本發明實施例之過驅動方法中步驟(e2)的詳細流程圖。 FIG. 5 is a detailed flow chart showing step (e2) in the overdrive method according to an embodiment of the present invention.
第6A圖及第6B圖分別繪示本發明實施例之過驅動方法中應用之一維查表的示意圖。 FIG. 6A and FIG. 6B are respectively schematic diagrams showing one of the dimension tables used in the overdrive method according to the embodiment of the present invention.
第7A圖及第7B圖分別繪示第6A圖及第6B圖中增益值與灰階值參數的關係示意圖。 7A and 7B are diagrams showing the relationship between the gain value and the grayscale value parameter in FIGS. 6A and 6B, respectively.
第8圖繪示依照本發明實施例之過驅動方法中步驟 (e’)的詳細流程圖。 8 is a diagram showing steps in an overdrive method according to an embodiment of the present invention. Detailed flowchart of (e’).
第9圖繪示依照本發明實施例之過驅動方法中步驟(e2’)的詳細流程圖。 Figure 9 is a detailed flow chart showing the step (e2') in the overdrive method in accordance with an embodiment of the present invention.
第10A圖及第10B圖分別繪示本發明實施例之過驅動方法中應用之一維查表的示意圖。 FIG. 10A and FIG. 10B are schematic diagrams respectively showing one of the dimension tables used in the overdrive method according to the embodiment of the present invention.
第11A圖及第11B圖分別繪示第10A圖及第10B圖中增益值與灰階值參數的關係示意圖。 11A and 11B are diagrams showing the relationship between the gain value and the grayscale value parameter in FIGS. 10A and 10B, respectively.
(a)-(F)‧‧‧流程步驟 (a)-(F)‧‧‧ Process steps
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