TWI413092B - Driving method for liquid crystal display and generating method for three dimensional gamma table - Google Patents
Driving method for liquid crystal display and generating method for three dimensional gamma table Download PDFInfo
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本發明是有關於一種液晶顯示器之驅動方法及三維伽瑪表之產生方法，且特別是有關於一種減少整體灰階反應時間的液晶顯示器之驅動方法及三維伽瑪表之產生方法。The invention relates to a driving method of a liquid crystal display and a method for generating a three-dimensional gamma table, and particularly relates to a driving method of a liquid crystal display and a method for generating a three-dimensional gamma table, which reduce the overall gray-scale reaction time.
三維顯示技術被視為是顯示技術的新世代產品標的。人類的大腦可以利用兩眼視差，來判斷物體的距離感，兩眼視差是指觀賞者的左眼與右眼之間有一水平位移，使得觀看物體時，因觀看角度略有不同，導致兩眼所接收的影像也略有差異。三維顯示技術的開發就是藉由左眼與右眼分別接受不同影像的概念，發展出戴眼鏡式(stereoscopic)三維液晶顯示器及裸眼式(auto-stereoscopic)三維液晶顯示器。3D display technology is considered the new generation of display technology. The human brain can use the parallax of the two eyes to judge the sense of distance of the object. The parallax of the two eyes refers to a horizontal displacement between the left eye and the right eye of the viewer, so that when viewing the object, the viewing angle is slightly different, resulting in two eyes. The received images are also slightly different. The development of three-dimensional display technology is to develop a stereoscopic three-dimensional liquid crystal display and an auto-stereoscopic three-dimensional liquid crystal display by accepting the concept of different images by the left eye and the right eye, respectively.
液晶顯示器的灰階反應時間將嚴重地影響三維影像的視覺效果。灰階反應時間指的是由某一灰階值切換至另一灰階值時，液晶分子轉動至所期望位置需花的時間。然而，傳統液晶顯示器的整體灰階反應時間太長，容易導致左眼影像與右眼影像互相干擾(3D crosstalk)而嚴重影響三維影像的視覺效果。The grayscale response time of the liquid crystal display will seriously affect the visual effect of the three-dimensional image. The gray-scale reaction time refers to the time it takes for the liquid crystal molecules to rotate to the desired position when switching from one gray scale value to another gray scale value. However, the overall gray-scale reaction time of the conventional liquid crystal display is too long, which easily causes the left-eye image and the right-eye image to interfere with each other (3D crosstalk) and seriously affects the visual effect of the three-dimensional image.
本發明係有關於一種液晶顯示器之驅動方法及三維伽瑪表(Gamma Table)之產生方法，透過於三維伽瑪表中刪除部份灰階以大幅地降低液晶顯示器的整體灰階反應時間，進而改善左眼影像與右眼影像互相干擾(3D crosstalk)的現象以提高三維影像的視覺效果。The invention relates to a driving method of a liquid crystal display and a method for generating a three-dimensional gamma table, which can reduce the overall gray-scale reaction time of the liquid crystal display by deleting a part of the gray scale in the three-dimensional gamma table, and further Improve the phenomenon that the left eye image and the right eye image interfere with each other (3D crosstalk) to improve the visual effect of the three-dimensional image.
根據本發明，提出一種液晶顯示器之驅動方法。液晶顯示器之驅動方法包括：判斷輸入視訊源為二維輸入視訊訊號或三維輸入視訊訊號；當輸入訊號源為二維輸入視訊訊號，根據二維伽瑪表將二維輸入視訊訊號轉換為二維輸出視訊訊號輸出，並根據二維輸出視訊訊號顯示二維影像，二維伽瑪表係根據液晶面板之伽瑪曲線所產生，伽瑪曲線由保留部份及捨棄部份所組成；以及當輸入視訊源為三維輸入視訊訊號，根據三維伽瑪表將三維輸入視訊訊號轉換為三維輸出視訊訊號輸出，並根據三維輸出視訊訊號顯示三維影像，三維伽瑪表係僅根據保留部份所產生。According to the present invention, a driving method of a liquid crystal display is proposed. The driving method of the liquid crystal display comprises: determining whether the input video source is a two-dimensional input video signal or a three-dimensional input video signal; when the input signal source is a two-dimensional input video signal, converting the two-dimensional input video signal into two-dimensional according to the two-dimensional gamma table Outputting a video signal output and displaying a two-dimensional image according to a two-dimensional output video signal. The two-dimensional gamma table is generated according to a gamma curve of the liquid crystal panel, and the gamma curve is composed of a reserved portion and a discarded portion; and when input The video source is a three-dimensional input video signal, and the three-dimensional input video signal is converted into a three-dimensional output video signal output according to the three-dimensional gamma table, and the three-dimensional image is displayed according to the three-dimensional output video signal, and the three-dimensional gamma table is generated only according to the reserved portion.
根據本發明，提出一種三維伽瑪表之產生方法。三維伽瑪表之產生方法包括：選擇灰階臨限值；根據灰階臨限值將液晶面板之伽瑪曲線劃分為保留部份及捨棄部份，伽瑪曲線用以產生二維伽瑪表(Gamma Table)；以及僅根據保留部份產生三維伽瑪表。According to the present invention, a method of generating a three-dimensional gamma table is proposed. The method for generating the three-dimensional gamma table comprises: selecting a gray level threshold; dividing the gamma curve of the liquid crystal panel into a reserved portion and a discarded portion according to the gray level threshold, and the gamma curve is used to generate a two-dimensional gamma table (Gamma Table); and generate a three-dimensional gamma table based only on the reserved portion.
為了對本發明之上述及其他方面有更佳的瞭解，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下：In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:
為了改善液晶顯示器整體的灰階反應時間，下述實施例提出一種液晶顯示器之驅動方法及三維伽瑪表(Gamma Table)之產生方法。液晶顯示器之驅動方法包括如下步驟：判斷輸入視訊源為二維輸入視訊訊號或三維輸入視訊訊號。當輸入訊號源為二維輸入視訊訊號，根據二維伽瑪表將二維輸入視訊訊號轉換為二維輸出視訊訊號輸出，並根據二維輸出視訊訊號顯示二維影像。二維伽瑪表係根據液晶面板之伽瑪曲線所產生，伽瑪曲線由保留部份及捨棄部份所組成。當輸入視訊源為三維輸入視訊訊號，根據三維伽瑪表將三維輸入視訊訊號轉換為三維輸出視訊訊號輸出，並根據三維輸出視訊訊號顯示三維影像。三維伽瑪表係僅根據保留部份所產生。In order to improve the gray scale reaction time of the liquid crystal display as a whole, the following embodiment proposes a driving method of a liquid crystal display and a method of generating a three-dimensional gamma table. The driving method of the liquid crystal display comprises the following steps: determining whether the input video source is a two-dimensional input video signal or a three-dimensional input video signal. When the input signal source is a two-dimensional input video signal, the two-dimensional input video signal is converted into a two-dimensional output video signal output according to the two-dimensional gamma table, and the two-dimensional image is displayed according to the two-dimensional output video signal. The two-dimensional gamma table is generated according to the gamma curve of the liquid crystal panel, and the gamma curve is composed of a reserved portion and a discarded portion. When the input video source is a three-dimensional input video signal, the three-dimensional input video signal is converted into a three-dimensional output video signal output according to the three-dimensional gamma table, and the three-dimensional image is displayed according to the three-dimensional output video signal. The 3D gamma table is only generated based on the reserved portion.
三維伽瑪表之產生方法包括如下步驟：首先，選擇灰階臨限值。接著，根據灰階臨限值將液晶面板之伽瑪曲線劃分為保留部份及捨棄部份，伽瑪曲線用以產生二維伽瑪表。然後，僅根據保留部份產生三維伽瑪表。茲舉實施例詳細說明如下。The method for generating a three-dimensional gamma table includes the following steps: First, selecting a gray level threshold. Then, the gamma curve of the liquid crystal panel is divided into a reserved portion and a discarded portion according to the gray limit threshold, and the gamma curve is used to generate a two-dimensional gamma table. Then, a three-dimensional gamma table is generated based only on the reserved portion. The embodiments are described in detail below.
請參照第1圖，第1圖繪示係為一種扭曲排列型(Twisted Nematic,TN)液晶面板之部分灰階反應時間(Gray to Gray Response Time)量測表。不同的灰階切換係對應至不同的灰階反應時間。舉例來說，當扭曲排列型液晶面板由灰階0切換至灰階64時，灰階反應時間需要1.5毫秒(ms)，而當扭曲排列型液晶面板由灰階0切換至灰階96時，灰階反應時間需要2.77毫秒。透過量測扭曲排列型液晶面板灰階切換所對應的灰階反應時間，將可發現扭曲排列型液晶面板由低灰階切換到高灰階時，其灰階反應時間最慢。Please refer to FIG. 1 , which is a partial gray-to-gray response time measurement table of a Twisted Nematic (TN) liquid crystal panel. Different grayscale switching systems correspond to different grayscale reaction times. For example, when the twist-aligned liquid crystal panel is switched from gray scale 0 to gray scale 64, the gray scale reaction time requires 1.5 milliseconds (ms), and when the twisted alignment liquid crystal panel is switched from gray scale 0 to gray scale 96, The grayscale reaction time takes 2.77 milliseconds. By measuring the gray-scale reaction time corresponding to the gray-scale switching of the twisted-arranged liquid crystal panel, it can be found that the gray-scale reaction time is the slowest when the twist-aligned liquid crystal panel is switched from the low gray scale to the high gray scale.
若計算扭曲排列型液晶面板中灰階0、32、64、96、128、160、192、224及225之間的灰階切換將可發現扭曲排列型液晶面板整體的灰階反應時間平均為2.37毫秒。然而，若先捨棄灰階204以上的高灰階再重新計算扭曲排列型液晶面板中灰階0、32、64、96、128、160及192之間的灰階切換將可發現扭曲排列型液晶面板整體的灰階反應時間平均降為1.93毫秒。故此，下述實施例在顯示三維影像時將於三維伽瑪表中捨棄部分高灰階值以提升扭曲排列型液晶面板整體的灰階反應時間，進而有效改善三維影像的殘影問題。此外，垂直配向型(Vertical Alignment,VA)液晶面板中由高灰階切換到低灰階時，其灰階反應時間最慢。因此，下述實施例在顯示三維影像時亦可捨棄三維伽瑪表中部分低灰階值以提升垂直配向型液晶面板整體的灰階反應時間，進而有效改善三維影像的殘影問題。If the gray-scale switching between gray scales 0, 32, 64, 96, 128, 160, 192, 224, and 225 in the twist-aligned liquid crystal panel is calculated, the gray-scale reaction time of the entire twist-aligned liquid crystal panel is found to be 2.37 on average. millisecond. However, if the gray scale above the gray scale 204 is discarded first and then the gray scale switching between the gray scales 0, 32, 64, 96, 128, 160 and 192 in the twisted alignment liquid crystal panel is recalculated, the twisted alignment liquid crystal can be found. The overall gray-scale reaction time of the panel is reduced to 1.93 milliseconds. Therefore, in the following embodiments, when displaying the three-dimensional image, a part of the high gray scale value is discarded in the three-dimensional gamma table to improve the gray-scale reaction time of the entire twist-aligned liquid crystal panel, thereby effectively improving the image sticking problem of the three-dimensional image. In addition, when switching from a high gray scale to a low gray scale in a Vertical Alignment (VA) liquid crystal panel, the gray scale reaction time is the slowest. Therefore, in the following embodiments, when displaying the three-dimensional image, some low gray scale values in the three-dimensional gamma table can be discarded to improve the gray-scale reaction time of the vertical alignment type liquid crystal panel as a whole, thereby effectively improving the image sticking problem of the three-dimensional image.
請同時參照第2圖及第3圖，第2圖繪示係為伽碼曲線之示意圖，第3圖繪示係為三維伽瑪表(Gamma Table)之產生方法之流程圖。三維伽瑪表(Gamma Table)之產生方法包括如下步驟：首先如步驟310所示，選擇灰階臨限值Gth。灰階臨限值Gth可視液晶面板之灰階反應時間來決定。舉例來說，若液晶面板之灰階反應時間如第1圖繪示，則灰階臨限值Gth例如為前述之灰階204。接著如步驟320所示，根據灰階臨限值Gth將伽瑪曲線20劃分為保留部份20a及捨棄部份20b，伽瑪曲線20用以產生二維伽瑪表(Gamma Table)。然後如步驟330所示，僅根據保留部份20a產生三維伽瑪表。當液晶面板為扭曲排列型液晶面板時，由於三維伽瑪表需捨棄部分高灰階值，因此捨棄部份20b所對應之灰階值係大於保留部份20a所對應之灰階值。相對地，當液晶面板為垂直配向型液晶面板時，由於三維伽瑪表需捨棄部分低灰階值，因此保留部份所對應之灰階值反而將大於捨棄部份所對應之灰階值。以扭曲排列型液晶面板為例，若灰階臨限值Gth為前述之灰階204，則三維伽瑪表的輸出灰階值將介於灰階0至灰階204的灰階區間。而三維伽瑪表的輸入灰階值將仍維持介於灰階0至灰階255的灰階區間。Please refer to FIG. 2 and FIG. 3 at the same time, FIG. 2 is a schematic diagram showing a gamma curve, and FIG. 3 is a flow chart showing a method for generating a three-dimensional gamma table. The method of generating a three-dimensional gamma table includes the following steps: First, as shown in step 310, the gray level threshold Gth is selected. The gray-scale threshold Gth is determined by the gray-scale reaction time of the liquid crystal panel. For example, if the gray-scale reaction time of the liquid crystal panel is as shown in FIG. 1, the gray-scale threshold Gth is, for example, the gray scale 204 described above. Next, as shown in step 320, the gamma curve 20 is divided into a reserved portion 20a and a discarded portion 20b according to the gray level threshold Gth, and the gamma curve 20 is used to generate a two-dimensional gamma table. Then, as shown in step 330, a three-dimensional gamma table is generated based only on the reserved portion 20a. When the liquid crystal panel is a twisted liquid crystal panel, since the three-dimensional gamma table needs to discard a part of the high grayscale value, the grayscale value corresponding to the discarded portion 20b is greater than the grayscale value corresponding to the reserved portion 20a. In contrast, when the liquid crystal panel is a vertical alignment type liquid crystal panel, since the three-dimensional gamma table needs to discard some low gray scale values, the gray scale value corresponding to the remaining portion is larger than the gray scale value corresponding to the discarded portion. Taking the twisted-arranged liquid crystal panel as an example, if the gray-scale threshold Gth is the gray scale 204 described above, the output gray-scale value of the three-dimensional gamma table will be in the gray-scale interval of the gray scale 0 to the gray scale 204. The input grayscale value of the three-dimensional gamma table will still maintain the grayscale interval between grayscale 0 and grayscale 255.
請同時參照第4圖及第5圖，第4圖繪示係為液晶顯示器之部分示意圖，第5圖為液晶顯示器之驅動方法之流程圖。液晶顯示器4包括時序控制器41、資料驅動器42及液晶面板43。時序控制器包括儲存單元412及處理單元414。儲存單元412用以儲存二維伽瑪表44及三維伽瑪表45。二維伽瑪表44係根據液晶面板43之伽瑪曲線所產生，液晶面板43之伽瑪曲線例如為第2圖所繪示之由保留部份20a及捨棄部份20b所組成之伽瑪曲線20。三維伽瑪表45則係僅根據保留部份20a所產生，而三維伽瑪表45的產生方法已於前述第3圖繪示說明，在此不另行贅述。Please refer to FIG. 4 and FIG. 5 at the same time. FIG. 4 is a partial schematic view showing a liquid crystal display, and FIG. 5 is a flow chart showing a driving method of the liquid crystal display. The liquid crystal display 4 includes a timing controller 41, a data driver 42, and a liquid crystal panel 43. The timing controller includes a storage unit 412 and a processing unit 414. The storage unit 412 is configured to store the two-dimensional gamma table 44 and the three-dimensional gamma table 45. The two-dimensional gamma table 44 is generated according to the gamma curve of the liquid crystal panel 43, and the gamma curve of the liquid crystal panel 43 is, for example, the gamma curve composed of the reserved portion 20a and the discarded portion 20b as shown in FIG. 20. The three-dimensional gamma table 45 is generated only by the remaining portion 20a, and the method for generating the three-dimensional gamma table 45 has been illustrated in the foregoing third figure, and will not be further described herein.
液晶顯示器40之驅動方法包括如下步驟：首先如步驟510所示，處理單元414判斷輸入視訊源Sin為二維輸入視訊訊號或三維輸入視訊訊號。當輸入視訊源Sin為二維輸入視訊訊號，則如步驟520所示。於步驟520中，處理單元414根據二維伽瑪表44將二維輸入視訊訊號轉換為二維輸出視訊訊號輸出至資料驅動器42，並由資料驅動器42根據二維輸出視訊訊號輸出像素電壓驅動液晶面板43顯示二維影像。The driving method of the liquid crystal display 40 includes the following steps: First, as shown in step 510, the processing unit 414 determines that the input video source Sin is a two-dimensional input video signal or a three-dimensional input video signal. When the input video source Sin is a two-dimensional input video signal, as shown in step 520. In step 520, the processing unit 414 converts the two-dimensional input video signal into a two-dimensional output video signal to the data driver 42 according to the two-dimensional gamma table 44, and drives the liquid crystal according to the two-dimensional output video signal output pixel voltage by the data driver 42. The panel 43 displays a two-dimensional image.
相反地，當輸入訊號源Sin為三維輸入視訊訊號，則如步驟530所示。於步驟530中，處理單元414根據三維伽瑪表45將三維輸入視訊訊號轉換為三維輸出視訊訊號輸出至資料驅動器42，資料驅動器42並根據三維輸出視訊訊號輸出像素電壓驅動液晶面板43顯示三維影像。Conversely, when the input signal source Sin is a three-dimensional input video signal, as shown in step 530. In step 530, the processing unit 414 converts the three-dimensional input video signal into a three-dimensional output video signal according to the three-dimensional gamma table 45, and outputs the data to the data driver 42. The data driver 42 drives the liquid crystal panel 43 to display the three-dimensional image according to the three-dimensional output video signal output pixel voltage. .
進一步來說，二維伽瑪表44係記錄輸入灰階值與輸出灰階值之間的對應關係。三維伽瑪表45同樣地係記錄輸入灰階值與輸出灰階值之間的對應關係。由於二維伽瑪表44係根據完整的伽瑪曲線所產生，因此二維伽瑪表的輸入灰階值及輸出灰階值介於相同的第一灰階區間，第一灰階區間例如皆為灰階0至灰階255。相對地，由於三維伽瑪表45係僅根據部份的伽瑪曲線所產生，因此三維伽瑪表45的輸出灰階值落於小於第一灰階區間的第二灰階區間，第二灰階區間例如為灰階0至灰階204。三維伽瑪表45的輸入灰階值將仍維持於第一灰階區間。Further, the two-dimensional gamma table 44 records the correspondence between the input grayscale value and the output grayscale value. The three-dimensional gamma table 45 similarly records the correspondence between the input grayscale value and the output grayscale value. Since the two-dimensional gamma table 44 is generated according to the complete gamma curve, the input grayscale value and the output grayscale value of the two-dimensional gamma table are in the same first grayscale interval, and the first grayscale interval is, for example, It is grayscale 0 to grayscale 255. In contrast, since the three-dimensional gamma table 45 is generated only according to a partial gamma curve, the output gray scale value of the three-dimensional gamma table 45 falls within a second gray-scale interval smaller than the first gray-scale interval, and the second gray The interval is, for example, a gray scale 0 to a gray scale 204. The input grayscale value of the three-dimensional gamma table 45 will remain in the first grayscale interval.
由於第二灰階區間小於第一灰階區間，因此當處理單元414接收三維輸入視訊訊號後，需將三維輸入視訊訊號中的輸入灰階值根據三維伽瑪表45實質上等比例縮小後，產生三維輸出視訊訊號中的輸出灰階值輸出。舉例來說，前述保留部份20a中最高灰階為灰階204，而伽瑪曲線20中最高灰階為灰階255。因此三維伽瑪表45中輸出灰階值與輸入灰階值將實質上呈1：0.8的比例關係。當三維輸入視訊訊號中的輸入灰階值等於100時，則處理單元414根據三維伽瑪表45找出三維輸出視訊訊號中的輸出灰階值等於80，並將輸出灰階值輸出至資料驅動器42。Since the second grayscale interval is smaller than the first grayscale interval, after the processing unit 414 receives the three-dimensional input video signal, the input grayscale value in the three-dimensional input video signal is substantially scaled down according to the three-dimensional gamma table 45. Generates an output grayscale value output in the three-dimensional output video signal. For example, the highest gray level in the aforementioned reserved portion 20a is the gray level 204, and the highest gray level in the gamma curve 20 is the gray level 255. Therefore, the output gray scale value and the input gray scale value in the three-dimensional gamma table 45 will be substantially in a proportional relationship of 1:0.8. When the input grayscale value in the three-dimensional input video signal is equal to 100, the processing unit 414 finds the output grayscale value in the three-dimensional output video signal equal to 80 according to the three-dimensional gamma table 45, and outputs the output grayscale value to the data driver. 42.
上述液晶顯示器之驅動方法及三維伽瑪表之產生方法透過於三維伽瑪表中刪除部份灰階以大幅地降低液晶顯示器的整體灰階反應時間，進而改善左眼影像與右眼影像互相干擾(3D crosstalk)的現象以提高三維影像的視覺效果。The driving method of the liquid crystal display and the method for generating the three-dimensional gamma table are performed by deleting a part of the gray scale in the three-dimensional gamma table to greatly reduce the overall gray-scale reaction time of the liquid crystal display, thereby improving mutual interference between the left-eye image and the right-eye image. (3D crosstalk) phenomenon to improve the visual effect of 3D images.
綜上所述，雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。因此，本發明之保護範圍當視後附之申請專利範圍所界定者為準。In conclusion, the present invention has been disclosed in the above preferred embodiments, 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.
4．．．液晶顯示器4. . . LCD Monitor
20．．．伽瑪曲線20. . . Gamma curve
20a．．．保留部份20a. . . Reserved part
20b．．．捨棄部份20b. . . Discard part
41．．．時序控制器41. . . Timing controller
42．．．資料驅動器42. . . Data driver
43．．．液晶面板43. . . LCD panel
44．．．二維伽瑪表44. . . Two-dimensional gamma table
45．．．三維伽瑪表45. . . Three-dimensional gamma table
310、320、330、510、520、530．．．步驟310, 320, 330, 510, 520, 530. . . step
412．．．儲存單元412. . . Storage unit
414．．．處理單元414. . . Processing unit
Sin．．．輸入視訊源Sin. . . Input video source
Gth．．．灰階臨限值Gth. . . Gray scale threshold
第1圖繪示係為一種扭曲排列型(Twisted Nematic,TN)液晶面板之部分灰階反應時間(Gray to Gray Response Time)量測表。Fig. 1 is a diagram showing a gray to gray response time measurement table of a Twisted Nematic (TN) liquid crystal panel.
第2圖繪示係為伽碼曲線之示意圖。Figure 2 is a schematic diagram showing a gamma curve.
第3圖繪示係為三維伽瑪表(Gamma Table)之產生方法之流程圖。Figure 3 is a flow chart showing the method of generating a three-dimensional gamma table.
第4圖繪示係為液晶顯示器之部分示意圖。Figure 4 is a partial schematic view showing a liquid crystal display.
第5圖為液晶顯示器之驅動方法之流程圖。Fig. 5 is a flow chart showing a driving method of the liquid crystal display.
510、520、530．．．步驟510, 520, 530. . . step
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