TWI420453B - Display, timing controller, and multi-level over driving method - Google Patents
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本發明是有關於一種顯示面板的驅動技術，且特別是有關於一種多階過驅動方法及其應用。The present invention relates to a driving technique for a display panel, and more particularly to a multi-stage overdrive method and application thereof.
近年來，隨著半導體科技蓬勃發展，攜帶型電子產品及平面顯示器產品也隨之興起。而在眾多平面顯示器的類型當中，液晶顯示器(Liquid Crystal Display,LCD)基於其低電壓操作、無輻射線散射、重量輕以及體積小等優點，隨即已成為各顯示器產品之主流。In recent years, with the rapid development of semiconductor technology, portable electronic products and flat panel display products have also emerged. Among the many types of flat panel displays, liquid crystal displays (LCDs) have become the mainstream of display products based on their low voltage operation, no radiation scattering, light weight and small size.
一般而言，由於液晶顯示器的液晶分子反應速度過慢，因此很容易造成模糊殘影現象。有鑑於此，傳統技術則利用過驅動(over driving)技術來改善此問題。依目前的過驅動技術而言，大致可分為單階過驅動(single-level over driving)與兩階過驅動(two-level over driving)兩類，但無論是採用哪一種類型的過驅動技術，在某些灰階切換的過程中(特別是應用面板操作在低溫，進行低灰階至中低灰階的切換時)，皆會引發犀牛角效應，例如圖1中的圈選處A。In general, since the liquid crystal molecules of the liquid crystal display react too slowly, it is easy to cause blurring. In view of this, the conventional technology utilizes over driving technology to improve this problem. According to the current overdrive technology, it can be roughly divided into two types: single-level over driving and two-level over driving, but no matter which type of overdrive technology is used. In some gray-scale switching processes (especially when the panel is operated at low temperatures, switching between low-gray to medium-low grayscale), rhino horn effects are induced, such as circle A in Figure 1.
而所謂的「犀牛角效應」可以解釋為：當輸入灰階例如從灰階0切換至灰階204時，此時若經查表而將過驅動灰階255施加到畫素的話，則畫素之液晶分子很有可能因為接收到過大的驅動電壓而發生亂倒現象，亦即傾斜角度錯誤。之後，若輸入灰階持續維持在灰階204的情況下，則畫素會突然到一更低的灰階亮度後再慢慢地回到目標灰階的亮度(亦即液晶分子之傾斜角度會漸次回復到正確的角度)。The so-called "rhino horn effect" can be interpreted as: when the input gray level is switched from gray scale 0 to gray scale 204, for example, if the overdrive gray scale 255 is applied to the pixel after looking up the table, then the pixel is The liquid crystal molecules are likely to be knocked down due to the reception of an excessive driving voltage, that is, the tilt angle is wrong. After that, if the input gray scale is continuously maintained in the gray scale 204, the pixel will suddenly return to a lower gray scale brightness and then slowly return to the target gray scale brightness (that is, the tilt angle of the liquid crystal molecules will be Gradually return to the correct angle).
基此，由於單階過驅動技術僅在輸入灰階進行低灰階切換至中低灰階執行一次過驅動而已。因此，於圖1中對應到單階過驅動技術的曲線101會有比較嚴重的犀牛角效應。另外，兩階過驅動技術會在輸入灰階進行低灰階切換至中低灰階執行兩次過驅動，並且在做第一次過驅動時，先存入小於目前灰階的灰階以再做第二次過驅動，但此做法仍然會有犀牛角效應，亦即於圖1中對應到兩階過驅動技術的曲線103會有比較趨緩的犀牛角效應。Based on this, the single-stage overdrive technology performs only one overdrive only when the input gray scale is switched to low gray scale to medium and low gray scale. Therefore, the curve 101 corresponding to the single-stage overdrive technique in Fig. 1 has a relatively severe rhino horn effect. In addition, the two-stage overdrive technology performs two overdrives at the input grayscale for low grayscale switching to medium and low grayscale, and when doing the first overdrive, first saves the grayscale smaller than the current grayscale to Do the second overdrive, but there is still a rhino horn effect in this way, that is, the curve 103 corresponding to the two-stage overdrive technique in Fig. 1 has a slower rhino horn effect.
有鑒於此，本發明提供一種多階過驅動方法，藉以於輸入灰階進行低灰階切換至高灰階時，加快畫素之液晶分子的反應速度；並於輸入灰階進行低灰階切換至中低灰階時，加以改善犀牛角效應。In view of the above, the present invention provides a multi-step overdrive method for speeding up the reaction speed of liquid crystal molecules of a pixel when the gray scale is switched to a high gray scale when the gray scale is input; and switching to a gray scale at the input gray scale to In the middle and low gray levels, the rhino horn effect is improved.
本發明提供一種多階過驅動方法，適於驅動顯示面板內的至少一畫素。該多階過驅動方法包括：儲存多個過驅動查找表、畫素之目前灰階與先前灰階，以及表示畫素之目前灰階與先前灰階關係的預測值；讀取並判斷預測值是否等於第一預設數值；當預測值等於第一預設數值時，依據畫素之目前灰階而於所有過驅動查找表中的第一過驅動查找表進行查找，藉以輸出與畫素之目前灰階相對應的第一過驅動灰階來據以驅動畫素；以及當預測值不等於第一預設數值時，依據畫素之目前灰階而於所有過驅動查找表中的第二過驅動查找表進行查找，藉以輸出與畫素之目前灰階相對應的第二過驅動灰階來據以驅動畫素。The present invention provides a multi-step overdrive method suitable for driving at least one pixel within a display panel. The multi-stage overdrive method includes: storing a plurality of overdrive lookup tables, a current grayscale and a previous grayscale of a pixel, and a predicted value indicating a relationship between a current grayscale and a previous grayscale of the pixel; reading and judging the predicted value Whether it is equal to the first preset value; when the predicted value is equal to the first preset value, the first overdrive lookup table in all overdrive lookup tables is searched according to the current gray scale of the pixel, thereby outputting and pixel The first overdrive grayscale corresponding to the grayscale is used to drive the pixels; and when the predicted value is not equal to the first preset value, the second in all overdrive lookup tables according to the current grayscale of the pixel The lookup table is overdriven to perform a lookup to output a second overdrive grayscale corresponding to the current grayscale of the pixel to drive the pixels.
於本發明的一實施例中，當預測值等於第一預設數值時，多階過驅動方法更包括：讀取並判斷畫素之先前灰階是否小於預設灰階；當畫素之先前灰階小於預設灰階時，將預測值從第一預設數值改寫為第二預設數值，並且依據畫素之目前灰階而於第一過驅動查找表進行查找，藉以輸出第一過驅動灰階來據以驅動畫素；以及當畫素之先前灰階大於預設灰階時，維持預測值為第一預設數值，並且依據畫素之目前灰階而於第一過驅動查找表進行查找，藉以輸出畫素之目前灰階來據以驅動畫素。In an embodiment of the invention, when the predicted value is equal to the first preset value, the multi-stage overdrive method further comprises: reading and determining whether the previous gray scale of the pixel is less than a preset gray scale; when the pixel is previously When the grayscale is less than the preset grayscale, the predicted value is rewritten from the first preset value to the second preset value, and the first overdrive lookup table is searched according to the current grayscale of the pixel, thereby outputting the first pass. Driving the gray scale to drive the pixels; and when the previous gray scale of the pixel is greater than the preset gray scale, maintaining the predicted value as the first preset value, and searching for the first overdrive according to the current gray scale of the pixel The table performs a lookup to output the pixel's current grayscale to drive the pixels.
於本發明的一實施例中，當預測值不等於第一預設數值時，多階過驅動方法更包括：讀取並判斷畫素之目前灰階與先前灰階實質上是否相同；當畫素之目前灰階與先前灰階實質上相同時，將預測值從第二預設數值改寫為第三預設數值，並且依據畫素之目前灰階而於第二過驅動查找表進行查找，藉以輸出第二過驅動灰階來據以驅動畫素；以及當畫素之目前灰階與先前灰階實質上不相同時，將預測值從第二預設數值改寫為第一預設數值。In an embodiment of the invention, when the predicted value is not equal to the first preset value, the multi-stage overdrive method further comprises: reading and determining whether the current gray level of the pixel is substantially the same as the previous gray level; When the current gray scale is substantially the same as the previous gray scale, the predicted value is rewritten from the second preset value to the third preset value, and the second overdrive lookup table is searched according to the current gray scale of the pixel. The second overdrive gray scale is output to drive the pixels; and when the current gray scale of the pixel is substantially different from the previous gray scale, the predicted value is rewritten from the second preset value to the first preset value.
於本發明的一實施例中，當畫素之目前灰階減去先前灰階的差值落於正值灰階與負值灰階之間時，則畫素之目前灰階與先前灰階實質上相同；另外，當畫素之目前灰階減去先前灰階的差值不落於正值灰階與負值灰階之間時，則畫素之目前灰階與先前灰階實質上不相同。In an embodiment of the present invention, when the difference between the current gray scale of the pixel and the previous gray scale falls between the positive gray scale and the negative gray scale, the current gray scale and the previous gray scale of the pixel Substantially the same; in addition, when the difference between the current gray scale of the pixel minus the previous gray scale does not fall between the positive gray scale and the negative gray scale, then the current gray scale of the pixel and the previous gray scale are substantially Not the same.
於本發明的一實施例中，當預測值從第二預設數值改寫為第三預設數值後，多階過驅動方法更包括：讀取並判斷第三預設數值是否超過一上限值；當第三預設數值未超過上限值時，將預測值從第三預設數值改寫為第四預設數值，並且依據畫素之目前灰階而於所有過驅動查找表中的第三過驅動查找表進行查找，藉以輸出與畫素之目前灰階相對應的第三過驅動灰階來據以驅動畫素；以及當第三預設數值已超過上限值時，將預測值從第三預設數值改寫為第一預設數值。In an embodiment of the invention, after the predicted value is rewritten from the second preset value to the third preset value, the multi-stage overdrive method further includes: reading and determining whether the third preset value exceeds an upper limit value When the third preset value does not exceed the upper limit value, the predicted value is rewritten from the third preset value to the fourth preset value, and the third in all overdrive lookup tables according to the current gray scale of the pixel Overriding the lookup table for searching, thereby outputting a third overdrive grayscale corresponding to the current grayscale of the pixel to drive the pixels; and when the third preset value has exceeded the upper limit, the predicted value is The third preset value is rewritten to the first preset value.
於本發明的一實施例中，預測值對應一衰減係數。In an embodiment of the invention, the predicted value corresponds to an attenuation coefficient.
本發明另提供一種時序控制器，其包括記憶單元與處理單元。其中，記憶單元用以儲存多個過驅動查找表、畫素之目前灰階與先前灰階，以及表示畫素之目前灰階與先前灰階關係的預測值。另外，處理單元耦接記憶單元，用以依據記憶單元所儲存的資訊來執行本發明之多階過驅動方法的判斷機制，藉以實現單階過驅動技術、兩階過驅動技術，甚至兩階以上的多階過驅動技術。The invention further provides a timing controller comprising a memory unit and a processing unit. The memory unit is configured to store a plurality of overdrive lookup tables, a current grayscale and a previous grayscale of the pixel, and a predicted value indicating a relationship between the current grayscale and the previous grayscale of the pixel. In addition, the processing unit is coupled to the memory unit for performing the determination mechanism of the multi-stage overdrive method of the present invention according to the information stored in the memory unit, thereby implementing a single-stage overdrive technology, a two-stage overdrive technique, and even two or more orders. Multi-stage overdrive technology.
本發明再提供一種具有本發明之時序控制器的顯示器。The present invention further provides a display having the timing controller of the present invention.
基於上述可知，本發明特別使用一預測值來記錄畫素之目前灰階與先前灰階的關係，藉以於預測值持續不為第一預設數值的狀態下(亦即判斷出輸入灰階在進行低灰階切換至中低灰階)，執行兩次以上的過驅動，直至預測值回復至第一預設數值為止(亦即判斷出輸入灰階已不在進行低灰階切換至中低灰階)。如此一來，當輸入灰階在進行低灰階切換至高灰階時，本發明得以加快畫素之液晶分子的反應速度；並且當輸入灰階在進行低灰階切換至中低灰階時，本發明得以改善全灰階切換的犀牛角效應。Based on the above, the present invention particularly uses a predicted value to record the relationship between the current gray level of the pixel and the previous gray level, so that the predicted value does not continue to be the first preset value (ie, the input gray level is determined to be Perform low-gray switching to medium-low grayscale) and perform more than two overdrives until the predicted value returns to the first preset value (ie, it is judged that the input grayscale is no longer switching to low-gray gray) Order). In this way, when the input gray scale is switched to the low gray scale, the present invention speeds up the reaction speed of the liquid crystal molecules of the pixels; and when the input gray scale is switched to the low gray scale, The present invention improves the rhino horn effect of full gray scale switching.
為讓本發明之上述特徵和優點能更明顯易懂，下文特舉幾個示範性實施例，並配合所附圖式，作詳細說明如下，但是上述一般描述及以下實施方式僅為例示性及闡釋性的，其並不能限制本發明所欲主張之範圍。The above described features and advantages of the invention will be more apparent from the following description. It is not intended to limit the scope of the claimed invention.
有關本發明之前述及其他技術內容、特點與功效，在以下配合參考圖式之多個實施例的詳細說明中，將可清楚地呈現。現將詳細參考本發明之實施例，並在附圖中說明所述實施例之實例。另外，凡可能之處，在圖式及實施方式中使用相同標號的元件/構件代表相同或類似部分。The foregoing and other objects, features, and advantages of the invention will be apparent from the Detailed Description Reference will now be made in detail be made to the embodiments of the invention In addition, wherever possible, the same reference numerals in the drawings
圖2繪示為本發明一實施例之顯示器200的系統方塊圖。請參照圖2，顯示器200例如為液晶顯示器(LCD)，且包括顯示面板(display panel)201、時序控制器(timing controller)203、源極驅動器(source driver)205、閘極驅動器(gate driver)207，以及背光模組(backlight module)209。一般而言，顯示面板201具有多個以陣列方式(M×N)排列的畫素P，且受源極驅動器205與閘極驅動器207的驅動，以搭配背光模組209所提供的(面)光源來達到顯示影像畫面的目的。然而，由於該等知識實屬本發明領域具有通常知識者所熟識的技藝，故而在此並不再加以贅述。2 is a system block diagram of a display 200 in accordance with an embodiment of the present invention. Referring to FIG. 2, the display 200 is, for example, a liquid crystal display (LCD), and includes a display panel 201, a timing controller 203, a source driver 205, and a gate driver. 207, and a backlight module 209. Generally, the display panel 201 has a plurality of pixels P arranged in an array (M×N), and is driven by the source driver 205 and the gate driver 207 to match the surface provided by the backlight module 209. The light source is used to achieve the purpose of displaying an image. However, since such knowledge is within the skill of the art in the field of the invention, it is not described herein.
另外，時序控制器203用以控制源極驅動器205與閘極驅動器207的運作，且主要的控制機制/方式亦屬本發明領域具有通常知識者所熟識的技藝，故而在此亦不再加以贅述。於此，以下內容僅針對本發明實現多階過驅動的技術來進行解說。In addition, the timing controller 203 is used to control the operation of the source driver 205 and the gate driver 207, and the main control mechanism/mode is also a skill familiar to those skilled in the art, and therefore will not be described herein. . Herein, the following content is only explained for the technology of the present invention to implement multi-stage overdrive.
於本實施例中，時序控制器203包括記憶單元203a與處理單元203b。記憶單元203a用以儲存多個過驅動查找表LUT1、LUT2…LUTN、每一畫素之目前灰階與先前灰階，以及表示每一畫素之目前灰階與先前灰階關係的預測值。處理單元203b耦接記憶單元203a，用以讀取並判斷每一畫素所對應的預測值是否等於各自的第一預設數值。In the present embodiment, the timing controller 203 includes a memory unit 203a and a processing unit 203b. The memory unit 203a is configured to store a plurality of overdrive lookup tables LUT1, LUT2...LUTN, a current grayscale and a previous grayscale of each pixel, and a predicted value indicating a relationship between the current grayscale and the previous grayscale of each pixel. The processing unit 203b is coupled to the memory unit 203a for reading and determining whether the predicted value corresponding to each pixel is equal to the respective first preset value.
以單一/同一畫素為例，當處理單元203b判斷出畫素之預測值等於第一預設數值時，則依據畫素之目前灰階而於所有過驅動查找表LUT1~LUTN中的第一過驅動查找表LUT1進行查找，藉以輸出畫素之目前灰階，或者輸出與畫素之目前灰階相對應的第一過驅動灰階(first over driving grayscale)或低驅動灰階(low driving grayscale)給源極驅動器205據以驅動畫素。另外，當處理單元203b判斷出畫素之預測值不等於第一預設數值時，則依據畫素之目前灰階而於所有過驅動查找表LUT1~LUTN中的第二過驅動查找表LUT2進行查找，藉以輸出與畫素之目前灰階相對應的第二過驅動灰階(second over driving grayscale)給源極驅動器205據以驅動畫素。Taking a single/the same pixel as an example, when the processing unit 203b determines that the predicted value of the pixel is equal to the first preset value, the first of all the overdrive lookup tables LUT1 to LUTN according to the current gray level of the pixel. The overdrive lookup table LUT1 is searched to output the current grayscale of the pixel, or to output a first over driving grayscale or a low driving grayscale corresponding to the current grayscale of the pixel. The source driver 205 is driven to drive pixels. In addition, when the processing unit 203b determines that the predicted value of the pixel is not equal to the first preset value, the processing unit 203b performs the second overdrive lookup table LUT2 in all the overdrive lookup tables LUT1 L LUTN according to the current gray level of the pixel. The second upstream driving grayscale corresponding to the current gray scale of the pixel is outputted to the source driver 205 to drive the pixels.
於本實施例中，當處理單元203b判斷出畫素之預測值等於第一預設數值時，處理單元203b更用以讀取並判斷畫素之先前灰階是否小於一預設灰階(predetermined grayscale)。其中，當處理單元203b判斷出畫素之先前灰階小於預設灰階時，則將畫素之預測值從第一預設數值改寫為第二預設數值，並且依據畫素之目前灰階而於第一過驅動查找表LUT1進行查找，藉以輸出第一過驅動灰階或低驅動灰階。另外，當處理單元203b判斷出畫素之先前灰階大於預設灰階時，則維持畫素之預測值為第一預設數值，並且依據畫素之目前灰階而於第一過驅動查找表LUT1進行查找，藉以輸出畫素之目前灰階。In this embodiment, when the processing unit 203b determines that the predicted value of the pixel is equal to the first preset value, the processing unit 203b is further configured to read and determine whether the previous grayscale of the pixel is less than a preset grayscale (predetermined Grayscale). Wherein, when the processing unit 203b determines that the previous gray level of the pixel is less than the preset gray level, the predicted value of the pixel is rewritten from the first preset value to the second preset value, and according to the current gray level of the pixel The first overdrive lookup table LUT1 is searched to output the first overdrive grayscale or low drive grayscale. In addition, when the processing unit 203b determines that the previous gray level of the pixel is greater than the preset gray level, the predicted value of the pixel is maintained as the first preset value, and the first overdrive search is performed according to the current gray level of the pixel. Table LUT1 performs a lookup to output the current gray level of the pixel.
另一方面，當處理單元203b判斷出畫素之預測值不等於第一預設數值時，則處理單元203b更用以讀取並判斷畫素之目前灰階與先前灰階實質上是否相同。其中，當處理單元203b判斷出畫素之目前灰階與先前灰階實質上相同時，則將畫素之預測值從第二預設數值改寫為第三預設數值，並且依據畫素之目前灰階而於第二過驅動查找表LUT2進行查找，藉以輸出第二過驅動灰階。另外，當處理單元203b判斷出畫素之目前灰階與先前灰階實質上不相同時，則將畫素之預測值從第二預設數值改寫為第一預設數值。On the other hand, when the processing unit 203b determines that the predicted value of the pixel is not equal to the first preset value, the processing unit 203b is further configured to read and determine whether the current gray level of the pixel is substantially the same as the previous gray level. Wherein, when the processing unit 203b determines that the current gray level of the pixel is substantially the same as the previous gray level, the predicted value of the pixel is rewritten from the second preset value to the third preset value, and according to the current pixel. The grayscale is searched in the second overdrive lookup table LUT2 to output the second overdrive grayscale. In addition, when the processing unit 203b determines that the current gray level of the pixel is substantially different from the previous gray level, the predicted value of the pixel is rewritten from the second preset value to the first preset value.
於本實施例中，當畫素之目前灰階減去先前灰階的差值落於一正值灰階與一負值灰階之間(亦即負值灰階<差值<正值灰階)時，則畫素之目前灰階與先前灰階實質上相同，否則畫素之目前灰階與先前灰階實質上不相同。舉例來說，假設畫素之目前灰階為210、畫素之先前灰階為204、正值灰階為+10(可依實際需求決定)，而負值灰階為-5(可依實際需求決定)的話，則由於畫素之目前灰階減去先前灰階的差值為6(亦即210-204=6)，其落於正值灰階與負值灰階之間，故而判斷出畫素之目前灰階與先前灰階實質上相同。另外，假設畫素之目前灰階為200，而畫素之先前灰階為235的話，則由於畫素之目前灰階減去先前灰階的差值為-35(亦即200-235=-35)，其並非落於正值灰階與負值灰階之間，故而畫素之目前灰階與先前灰階實質上不相同。In this embodiment, when the difference between the current gray scale of the pixel and the previous gray scale falls between a positive gray scale and a negative gray scale (ie, a negative gray scale < difference < positive gray) In the case of the order, the current gray level of the pixel is substantially the same as the previous gray level, otherwise the current gray level of the pixel is substantially different from the previous gray level. For example, suppose the current gray level of the pixel is 210, the previous gray level of the pixel is 204, the positive gray level is +10 (which can be determined according to actual needs), and the negative gray level is -5 (according to the actual If the demand is determined, the difference between the current gray scale minus the previous gray scale is 6 (ie 210-204=6), which falls between the positive gray scale and the negative gray scale. The current gray level of the picture is essentially the same as the previous gray level. In addition, assuming that the current gray level of the pixel is 200, and the previous gray level of the pixel is 235, the difference between the current gray level of the pixel minus the previous gray level is -35 (ie, 200-235=- 35), it does not fall between the positive gray scale and the negative gray scale, so the current gray scale of the pixel is substantially different from the previous gray scale.
另一方面，當畫素之預測值從第二預設數值改寫為第三預設數值後，處理單元203b更用以讀取並判斷第三預設數值是否超過一上限值。其中，當處理單元203b判斷出第三預設數值未超過上限值時，則將畫素之預測值從第三預設數值改寫為第四預設數值，並且依據畫素之目前灰階而於所有過驅動查找表LUT1~LUTN中的第三過驅動查找表LUT3進行查找，藉以輸出與畫素之目前灰階相對應的第三過驅動灰階(third over driving grayscale)給源極驅動器205據以驅動畫素。另外，當處理單元203b判斷出第三預設數值已超過上限值時，則將畫素之預測值從第三預設數值改寫為第一預設數值。On the other hand, when the predicted value of the pixel is rewritten from the second preset value to the third preset value, the processing unit 203b is further configured to read and determine whether the third preset value exceeds an upper limit value. Wherein, when the processing unit 203b determines that the third preset value does not exceed the upper limit value, the predicted value of the pixel is rewritten from the third preset value to the fourth preset value, and according to the current gray level of the pixel. Searching for the third overdrive lookup table LUT3 in all overdrive lookup tables LUT1~LUTN, thereby outputting a third over driving grayscale corresponding to the current grayscale of the pixel to the source driver 205 To drive pixels. In addition, when the processing unit 203b determines that the third preset value has exceeded the upper limit value, the predicted value of the pixel is rewritten from the third preset value to the first preset value.
於此，假設同一畫素於連續的五個畫面期間之輸入灰階依序為0、200、200、200、200；預設灰階為36；畫素之初始預測值為0；畫素之灰階0~2所對應的預測值為1；畫素之灰階3~5所對應的預測值為2；畫素之灰階6~10所對應的預測值為3；畫素之灰階11~15所對應的預測值為4；畫素之灰階16~22所對應的預測值為5；畫素之灰階23~28所對應的預測值為6；畫素之灰階29~35所對應的預測值為7；第一預設數值為0；以及上限值為14。然而，本發明皆不限制於該等假設條件。Here, it is assumed that the input gray scale of the same pixel during consecutive five picture periods is 0, 200, 200, 200, 200; the preset gray level is 36; the initial predicted value of the pixel is 0; The predicted value corresponding to the gray scale 0~2 is 1; the predicted value corresponding to the gray scale 3~5 of the pixel is 2; the predicted value corresponding to the grayscale 6~10 of the pixel is 3; the gray scale of the pixel The predicted value corresponding to 11~15 is 4; the predicted value corresponding to the grayscale 16~22 of the pixel is 5; the predicted value corresponding to the grayscale 23~28 of the pixel is 6; the grayscale of the pixel is 29~ The predicted value corresponding to 35 is 7; the first preset value is 0; and the upper limit is 14. However, the invention is not limited to the assumptions.
基於上述的各假設條件，處理單元203b一開始會讀取畫素的初始預測值0，接著再判斷畫素的預測值0是否等於第一預設數值0。當處理單元203b判斷出畫素之預測值0等於第一預設數值0時，處理單元203b會接續讀取並判斷畫素之先前灰階是否小於預設灰階36。由於畫素之第一個與第二個畫面期間的灰階分別為0與200，故而此時畫素之目前灰階與先前灰階分別0與200。有鑑於此，處理單元203b會得知畫素之先前灰階0小於預設灰階36，從而將畫素之預測值從第一預設數值0改寫為第二預設數值1(其係因畫素之先前灰階0所對應的預測值為1)，並且依據畫素之目前灰階200而於第一過驅動查找表LUT1進行查找，藉以輸出第一過驅動灰階(例如255，但並不限制於此)或低驅動灰階(例如180，但並不限制於此)給源極驅動器205來據以驅動畫素。Based on the above various assumptions, the processing unit 203b initially reads the initial predicted value 0 of the pixel, and then determines whether the predicted value 0 of the pixel is equal to the first preset value of zero. When the processing unit 203b determines that the predicted value of the pixel is equal to the first preset value of 0, the processing unit 203b successively reads and determines whether the previous grayscale of the pixel is smaller than the preset grayscale 36. Since the gray levels of the first and second pictures of the pixels are 0 and 200, respectively, the current gray level of the pixel and the previous gray level are 0 and 200, respectively. In view of this, the processing unit 203b knows that the previous gray level 0 of the pixel is smaller than the preset gray level 36, thereby rewriting the predicted value of the pixel from the first preset value 0 to the second preset value 1 (the cause thereof) The predicted value of the previous gray scale 0 of the pixel is 1), and the first overdrive lookup table LUT1 is searched according to the current gray scale 200 of the pixel, thereby outputting the first overdrive gray scale (for example, 255, but It is not limited to this or a low drive gray scale (e.g., 180, but is not limited thereto) to the source driver 205 to drive the pixels.
緊接著，由於畫素之第二個與第三個畫面期間的灰階分別為200與200，故而此時畫素之目前灰階與先前灰階分別200與200。有鑑於此，當處理單元203b得知畫素之預測值1不等於第一預設數值0時，處理單元203b會接續讀取並判斷畫素之目前灰階200與先前灰階200實質上是否相同。由於畫素之目前灰階200與先前灰階200的差值0係落在先前內容所定義的正值灰階+10與負值灰階-5之間，故而處理單元203b此時會得知畫素之目前灰階200與先前灰階200實質上相同，從而將畫素之預測值從第二預設數值1改寫為第三預設數值8(本實施例係以加7為例，但並不限制於此)，並且依據畫素之目前灰階200而於第二過驅動查找表LUT2進行查找，藉以輸出第二過驅動灰階(例如255，但並不限制於此)給源極驅動器205來據以驅動畫素。Then, since the gray levels during the second and third pictures of the pixels are 200 and 200 respectively, the current gray level of the pixel and the previous gray level are 200 and 200 respectively. In view of this, when the processing unit 203b knows that the predicted value 1 of the pixel is not equal to the first preset value 0, the processing unit 203b successively reads and determines whether the current grayscale 200 and the previous grayscale 200 of the pixel are substantially the same. Since the difference 0 between the current grayscale 200 of the pixel and the previous grayscale 200 falls between the positive grayscale +10 and the negative grayscale-5 defined by the previous content, the processing unit 203b will know at this time. The current gray scale 200 of the pixel is substantially the same as the previous gray scale 200, so that the predicted value of the pixel is rewritten from the second preset value 1 to the third preset value 8 (this embodiment is based on the addition of 7 but It is not limited to this, and the second overdrive lookup table LUT2 is searched according to the current gray scale 200 of the pixel, thereby outputting the second overdrive gray scale (for example, 255, but not limited thereto) to the source driver. 205 came to drive the pixels.
之後，由於畫素之第三個與第四個畫面期間的灰階分別為200與200，故而此時畫素之目前灰階與先前灰階分別200與200。有鑑於此，當處理單元203b得知畫素之預測值8不等於第一預設數值0時，處理單元203b還是會接續讀取並判斷畫素之目前灰階200與先前灰階200實質上是否相同。由於畫素之目前灰階200與先前灰階200的差值0係落在先前內容所定義的正值灰階+10與負值灰階-5之間，故而處理單元203b此時會得知畫素之目前灰階200與先前灰階200實質上相同，從而再將畫素之預測值從第三預設數值8改寫為第四預設數值15(本實施例係以加7為例，但並不限制於此)，但由於第四預設數值15已大於上限值14，故而處理單元203b會轉而將畫素之預測值從第三預設數值8改寫為第一預設數值0，並且依據畫素之目前灰階200而於第三過驅動查找表LUT3進行查找，藉以輸出第三過驅動灰階(例如245，但並不限制於此)給源極驅動器205來據以驅動畫素。Thereafter, since the gray levels during the third and fourth picture periods of the pixels are 200 and 200, respectively, the current gray level of the pixel and the previous gray level are 200 and 200, respectively. In view of this, when the processing unit 203b knows that the predicted value 8 of the pixel is not equal to the first preset value 0, the processing unit 203b will continue to read and determine that the current grayscale 200 and the previous grayscale 200 of the pixel are substantially Is it the same? Since the difference 0 between the current grayscale 200 of the pixel and the previous grayscale 200 falls between the positive grayscale +10 and the negative grayscale-5 defined by the previous content, the processing unit 203b will know at this time. The current gray scale 200 of the pixel is substantially the same as the previous gray scale 200, so that the predicted value of the pixel is rewritten from the third preset value 8 to the fourth preset value 15 (this embodiment is an example of adding 7). However, it is not limited thereto, but since the fourth preset value 15 is greater than the upper limit value 14, the processing unit 203b may instead rewrite the predicted value of the pixel from the third preset value 8 to the first preset value. 0, and searching according to the current gray scale 200 of the pixel in the third overdrive lookup table LUT3, thereby outputting a third overdrive gray scale (eg, 245, but not limited thereto) to the source driver 205 to drive Picture.
最後，由於畫素之第四個與第五個畫面期間的灰階分別為200與200，故而此時畫素之目前灰階與先前灰階分別200與200。有鑑於此，當處理單元203b得知畫素之預測值0已等於第一預設數值0時，處理單元203b會接續讀取並判斷畫素之先前灰階200是否小於預設灰階36。由於畫素之先前灰階200大於預設灰階36，故而處理單元203b會維持畫素之預測值0為第一預設數值0，並且依據畫素之目前灰階200而於第一過驅動查找表LUT1進行查找，藉以輸出畫素之目前灰階200給源極驅動器205來據以驅動畫素。Finally, since the gray levels during the fourth and fifth pictures of the pixels are 200 and 200, respectively, the current gray level of the pixel and the previous gray level are 200 and 200, respectively. In view of this, when the processing unit 203b knows that the predicted value 0 of the pixel has been equal to the first preset value 0, the processing unit 203b successively reads and determines whether the previous grayscale 200 of the pixel is smaller than the preset grayscale 36. Since the previous gray scale 200 of the pixel is greater than the preset gray scale 36, the processing unit 203b maintains the predicted value 0 of the pixel as the first preset value 0, and the first overdrive according to the current gray scale 200 of the pixel. The lookup table LUT1 performs a lookup to output the current grayscale 200 of the pixels to the source driver 205 to drive the pixels.
基於上述同一畫素之連續五個畫面期間的輸入灰階範例可知，畫素之輸入灰階在進行低灰階切換至中低灰階的過程中會經歷三次過驅動，故而不但可以加快畫素之液晶分子的反應速度；並且相對於單階與多階過驅動技術而言，則更可以改善全灰階切換的犀牛角效應，其可從圖3中的圈選處B清楚看出，圖3中對應到本實施例之多階過驅動技術的曲線301相對於傳統單階與多階過驅動技術的曲線101與103而言，具有更加趨緩的犀牛角效應。Based on the input gray scale example of the same five pixels in the same pixel, the input gray scale of the pixel will undergo three overdrives during the process of switching from low gray scale to medium gray scale, so that the pixel can be accelerated. The reaction speed of the liquid crystal molecules; and the rhino horn effect of the full gray scale switching can be improved compared to the single-stage and multi-stage overdrive techniques, which can be clearly seen from the circle B in FIG. The curve 301 corresponding to the multi-stage overdrive technique of the present embodiment in Fig. 3 has a more slowing rhino horn effect with respect to the curves 101 and 103 of the conventional single-stage and multi-stage overdrive techniques.
於本實施例中，顯示面板201內的每一畫素皆會執行類似於上述範例的多階過驅動技術，故而在上述已清楚解釋同一畫素之連續五個畫面期間的輸入灰階範例後，本發明領域具有通常知識者應可自行類推/推演出其他畫素的多階過驅動過程，故而在此並不再加以贅述之。In this embodiment, each pixel in the display panel 201 performs a multi-stage overdrive technique similar to the above example, so that after the input gray scale example during the five consecutive screens of the same pixel has been clearly explained above, In the field of the invention, the general knowledge should be able to analogize/push the multi-order overdrive process of other pixels by themselves, and thus will not be further described herein.
除此之外，在本發明的其他實施例中，可以預先定義畫素之預測值所各別對應的衰減係數。舉例來說，畫素之預測值1與8的衰減係數為1；畫素之預測值2與9的衰減係數為0.8；畫素之預測值3與10的衰減係數為0.7；畫素之預測值4與11的衰減係數為0.6；畫素之預測值5與12的衰減係數為0.4；畫素之預測值6與13的衰減係數為0.3；以及畫素之預測值7與14的衰減係數為0.2。如此一來，當畫素之先前灰階所對應的預測值非為上述實施例之1時，則處理單元203b即可以透過畫素之預測值所各別對應的衰減係數來求得適當的過驅動灰階為多少。In addition to this, in other embodiments of the present invention, the attenuation coefficients corresponding to the respective predicted values of the pixels may be defined in advance. For example, the attenuation coefficients of the predicted values 1 and 8 of the pixels are 1; the attenuation coefficients of the predicted values 2 and 9 of the pixels are 0.8; the attenuation coefficients of the predicted values 3 and 10 of the pixels are 0.7; prediction of pixels The attenuation coefficients for values 4 and 11 are 0.6; the attenuation coefficients for predicted values 5 and 12 for pixels are 0.4; the attenuation coefficients for predicted values 6 and 13 for pixels are 0.3; and the attenuation coefficients for predicted values 7 and 14 for pixels. Is 0.2. In this way, when the predicted value corresponding to the previous gray scale of the pixel is not 1 of the above embodiment, the processing unit 203b can obtain an appropriate attenuation coefficient corresponding to each of the predicted values of the pixel. What is the driving gray level?
舉例來說，當畫素之先前灰階為4時，則畫素之先前灰階4所對應的預測值為2。如此一來，處理單元203b即可以透過畫素之預測值2所對應的衰減係數0.8來求得適當的過驅動灰階為多少，亦即：200+[(255-200)*0.8]=244。又舉例來說，當畫素之先前灰階為29時，則畫素之先前灰階29所對應的預測值為7。如此一來，處理單元203b即可以透過畫素之預測值7所對應的衰減係數0.2來求得適當的過驅動灰階為多少，亦即：200+[(255-200)*0.2]=211。請依此類推，故不再贅述之。For example, when the previous gray level of the pixel is 4, the previous gray level 4 of the pixel corresponds to a predicted value of 2. In this way, the processing unit 203b can determine the appropriate overdrive gray level by using the attenuation coefficient 0.8 corresponding to the predicted value 2 of the pixel, that is, 200+[(255-200)*0.8]=244 . For another example, when the previous gray scale of the pixel is 29, the predicted grayscale 29 of the pixel corresponds to a predicted value of 7. In this way, the processing unit 203b can determine the appropriate overdrive gray level by using the attenuation coefficient 0.2 corresponding to the predicted value of the pixel 7, that is, 200+[(255-200)*0.2]=211 . Please do the same, so I won't go into details.
再者，上述實施例係以加7為例來進行說明，但是在本發明的其他實施例中，亦可以加上其他數值，只要維持與上述實施例相應的運作即可。Furthermore, the above embodiment is described by taking the example of the addition of 7, but in other embodiments of the present invention, other numerical values may be added as long as the operation corresponding to the above embodiment is maintained.
舉例來說，若以加5為例，在同一畫素之連續五個畫面期間的輸入灰階同樣依序為0、200、200、200、200的話，則畫素之輸入灰階在進行低灰階切換至中低灰階的過程中會經歷四次過驅動。又舉例來說，若以加3為例，在同一畫素之連續五個畫面期間的輸入灰階同樣依序為0、200、200、200、200的話，則畫素之輸入灰階在進行低灰階切換至中低灰階的過程中會經歷五次過驅動。換言之，若所加上的數值越小，則畫素之輸入灰階在進行低灰階切換至中低灰階的過程中就會經歷越多次過驅動。For example, if the input gray level during the five consecutive frames of the same pixel is also 0, 200, 200, 200, 200 in the case of adding 5, the input gray level of the pixel is low. The grayscale switches to the middle and low grayscales and experiences four overdrives. For example, if the input gray level during the five consecutive frames of the same pixel is also 0, 200, 200, 200, 200 in the case of adding 3, the input gray level of the pixel is in progress. The low gray level switches to the medium and low gray level and experiences five overdrives. In other words, if the added value is smaller, the input gray level of the pixel will experience more overdrive during the process of switching from the low gray level to the medium and low gray level.
此外，上述實施例的所有設定數值皆可依據實際的設計需求來做適應性地改變。而且，在本發明的其他實施例中，亦可將畫素之預測值所各別對應的過驅動查找表與衰減係數製作成單一查找表以儲存在記憶單元203a內。如此一來，處理單元203b查找記憶單元203a內之資訊的彈性將可更進一步地提升。In addition, all the set values of the above embodiments can be adaptively changed according to actual design requirements. Moreover, in other embodiments of the present invention, the overdrive lookup table and the attenuation coefficient corresponding to the predicted values of the pixels may be made into a single lookup table for storage in the memory unit 203a. As a result, the flexibility of the processing unit 203b to find the information in the memory unit 203a can be further improved.
由上述所有實施例所揭示的內容可知，畫素之預測值乃是以4位元的形式(數值0~15)儲存在記憶單元203a內，但是若將畫素之預測值提升至4位元以上之形式儲存在記憶單元203a內的話，則可以執行更多階的過驅動或者提升多階過驅動的精確度。As can be seen from the disclosure of all the above embodiments, the predicted value of the pixel is stored in the memory unit 203a in the form of 4 bits (values 0 to 15), but if the predicted value of the pixel is raised to 4 bits. If the above form is stored in the memory unit 203a, more order of overdrive or higher accuracy of the multi-stage overdrive can be performed.
上述各實施例之時序控制器所揭示的多階過驅動技術特別適用在低溫面板中，藉以加速低溫面板之畫素的液晶分子反應速度。然而，上述各實施例之時序控制器亦可適用在常溫型或其他類型的面板當中。The multi-stage overdrive technology disclosed by the timing controller of each of the above embodiments is particularly suitable for use in a low temperature panel, thereby accelerating the liquid crystal molecular reaction speed of the pixels of the low temperature panel. However, the timing controller of each of the above embodiments can also be applied to a room temperature type or other type of panel.
彙整上述實施例之內容，圖4繪示為本發明一實施例之多階過驅動方法的流程圖。請參照圖4，本實施例之多階過驅動方法適於驅動顯示面板內的至少一畫素，且包括以下步驟：首先，如步驟S401所述，儲存多個過驅動查找表、畫素之目前灰階與先前灰階，以及表示畫素之目前灰階與先前灰階關係的預測值。接著，如步驟S403所述，讀取並判斷預測值是否等於第一預設數值。The content of the above embodiment is summarized. FIG. 4 is a flowchart of a multi-stage overdrive method according to an embodiment of the present invention. Referring to FIG. 4, the multi-stage overdrive method of the embodiment is adapted to drive at least one pixel in the display panel, and includes the following steps: First, as described in step S401, storing a plurality of overdrive lookup tables and pixels The current grayscale and previous grayscale, and the predicted value of the current grayscale and previous grayscale representation of the pixel. Next, as described in step S403, it is read and judged whether the predicted value is equal to the first preset value.
於本實施例中，當於步驟S403判斷出預測值等於第一預設數值時，則進行步驟S405以讀取並判斷畫素之先前灰階是否小於預設灰階。當畫素之先前灰階小於預設灰階時，則進行步驟S407以將預測值從第一預設數值改寫為第二預設數值，並且依據畫素之目前灰階而於所有過驅動查找表中的第一過驅動查找表進行查找，藉以輸出第一過驅動灰階或低驅動灰階來據以驅動畫素；否則，進行步驟409以維持預測值為第一預設數值，並且依據畫素之目前灰階而於第一過驅動查找表進行查找，藉以輸出畫素之目前灰階來據以驅動畫素。In this embodiment, when it is determined in step S403 that the predicted value is equal to the first preset value, step S405 is performed to read and determine whether the previous gray level of the pixel is less than the preset gray level. When the previous gray level of the pixel is less than the preset gray level, step S407 is performed to rewrite the predicted value from the first preset value to the second preset value, and all overdrive searches are performed according to the current gray level of the pixel. The first overdrive lookup table in the table performs a search to output a first overdrive grayscale or a low drive grayscale to drive the pixels; otherwise, step 409 is performed to maintain the predicted value as a first preset value, and The current gray scale of the pixel is searched in the first overdrive lookup table to output the current gray scale of the pixel to drive the pixel.
另一方面，當於步驟S403判斷出預測值不等於第一預設數值時，則進行步驟S411以讀取並判斷畫素之目前灰階與先前灰階實質上是否相同。當畫素之目前灰階與先前灰階實質上相同時，則進行步驟S413以將預測值從第二預設數值改寫為第三預設數值，並且依據畫素之目前灰階而於所有過驅動查找表中的第二過驅動查找表進行查找，藉以輸出第二過驅動灰階來據以驅動畫素；否則，進行步驟415以將預測值從第二預設數值改寫為第一預設數值。On the other hand, when it is determined in step S403 that the predicted value is not equal to the first preset value, step S411 is performed to read and determine whether the current gray level of the pixel is substantially the same as the previous gray level. When the current gray level of the pixel is substantially the same as the previous gray level, step S413 is performed to rewrite the predicted value from the second preset value to the third preset value, and all of the pixels are based on the current gray level of the pixel. Driving a second overdrive lookup table in the lookup table for searching, thereby outputting a second overdrive grayscale to drive the pixels; otherwise, performing step 415 to rewrite the predicted value from the second preset value to the first preset Value.
再者，當預測值從第二預設數值改寫為第三預設數值後，更進一步地進行步驟S417以讀取並判斷第三預設數值是否超過上限值。當第三預設數值未超過上限值時，則進行步驟S419以將預測值從第三預設數值改寫為第四預設數值，並且依據畫素之目前灰階而於所有過驅動查找表中的第三過驅動查找表進行查找，藉以輸出與畫素之目前灰階相對應的第三過驅動灰階來據以驅動畫素；否則，進行步驟421以將預測值從第三預設數值改寫為第一預設數值。Furthermore, after the predicted value is rewritten from the second preset value to the third preset value, step S417 is further performed to read and determine whether the third preset value exceeds the upper limit value. When the third preset value does not exceed the upper limit value, step S419 is performed to rewrite the predicted value from the third preset value to the fourth preset value, and all overdrive lookup tables are performed according to the current gray level of the pixel. The third overdrive lookup table is searched to output a third overdrive grayscale corresponding to the current grayscale of the pixel to drive the pixels; otherwise, step 421 is performed to adjust the predicted value from the third preset The value is rewritten to the first preset value.
綜上所述，本發明特別使用一預測值來記錄畫素之目前灰階與先前灰階的關係，藉以於預測值持續不為第一預設數值的狀態下(亦即判斷出輸入灰階在進行低灰階切換至中低灰階)，執行兩次以上的過驅動，直至預測值回復至第一預設數值為止(亦即判斷出輸入灰階已不在進行低灰階切換至中低灰階)。如此一來，當輸入灰階在進行低灰階切換至高灰階時，本發明得以加快畫素之液晶分子的反應速度；並且當輸入灰階在進行低灰階切換至中低灰階時，本發明得以改善全灰階切換的犀牛角效應。In summary, the present invention particularly uses a predicted value to record the relationship between the current gray level of the pixel and the previous gray level, so that the predicted value continues to be in the state of the first preset value (ie, the input gray level is determined) Performing low-gray switching to medium-low grayscale), performing overdrive twice or more until the predicted value returns to the first preset value (that is, it is judged that the input grayscale is not switching to low-gray transition to medium-low Grayscale). In this way, when the input gray scale is switched to the low gray scale, the present invention speeds up the reaction speed of the liquid crystal molecules of the pixels; and when the input gray scale is switched to the low gray scale, The present invention improves the rhino horn effect of full gray scale switching.
雖然已以多個實施例揭露如上，然其並非用以限定本實施範例，任何所屬技術領域中具有通常知識者，在不脫離本實施範例之精神和範圍內，當可作些許之更動與潤飾，故本實施範例之保護範圍當視後附之申請專利範圍所界定者為準。Although the foregoing has been disclosed in the above embodiments, it is not intended to limit the embodiments, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the embodiments. Therefore, the scope of protection of this embodiment is subject to the definition of the scope of the patent application.
101、103、301．．．曲線101, 103, 301. . . curve
200．．．顯示器200. . . monitor
201．．．顯示面板201. . . Display panel
203．．．時序控制器203. . . Timing controller
203a．．．記憶單元203a. . . Memory unit
203b．．．處理單元203b. . . Processing unit
205．．．源極驅動器205. . . Source driver
207．．．閘極驅動器207. . . Gate driver
209‧‧‧背光模組209‧‧‧Backlight module
P‧‧‧畫素P‧‧‧ pixels
A、B‧‧‧圈選處A, B‧‧‧ circle
LUT1~LUTN‧‧‧過驅動查找表LUT1~LUTN‧‧‧Overdrive lookup table
S401~S421‧‧‧本發明一實施例之多階過驅動方法的流程圖各步驟S401~S421‧‧‧ Steps of the flow chart of the multi-stage overdrive method according to an embodiment of the present invention
圖1繪示為傳統單階與兩階過驅動的犀牛角效應示意圖。Figure 1 is a schematic diagram showing the rhino angle effect of a conventional single-stage and two-stage overdrive.
圖2繪示為本發明一實施例之顯示器的系統方塊圖。2 is a block diagram of a system of a display according to an embodiment of the invention.
圖3繪示為本發明一實施例之多階過驅動以及傳統單階與兩階過驅動的犀牛角效應示意圖。FIG. 3 is a schematic diagram showing the multi-stage overdrive and the conventional single-stage and two-stage overdrive rhino horn effects according to an embodiment of the invention.
圖4繪示為本發明一實施例之多階過驅動方法的流程圖。4 is a flow chart of a multi-stage overdrive method according to an embodiment of the invention.
S401~S421．．．本發明一實施例之多階過驅動方法的流程圖各步驟S401~S421. . . Steps of the flowchart of the multi-stage overdrive method according to an embodiment of the present invention
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