TW201815160A - Display method and display device for reducing motion blur in video - Google Patents
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本揭露是關於一種顯示方法及裝置,尤其是一種用以改善影像動態模糊的顯示方法及裝置。 The present disclosure relates to a display method and apparatus, and more particularly to a display method and apparatus for improving image motion blur.
液晶顯示器(Liquid crystal display,LCD)為目前常用的顯示螢幕,而液晶顯示是一種維持類型(hold type)的顯示裝置,亦即對於每個像素而言,像素強度值會維持定值直到下一個影像訊框被更新為新的強度值為止。由於此特性,在顯示連續的影像訊框時,影像中移動的物體在一個影像訊框中是維持靜態不動的,因而對於人眼視覺會產生動態模糊現象(motion blur),降低了影像品質並可能造成觀賞不適感。因此,如何改善此類顯示裝置的影像動態模糊現象,乃目前業界所致力的課題之一。 A liquid crystal display (LCD) is a commonly used display screen, and a liquid crystal display is a hold type display device, that is, for each pixel, the pixel intensity value is maintained until the next one. The image frame is updated to the new intensity value. Due to this feature, when a continuous image frame is displayed, the moving object in the image remains static in an image frame, thereby causing motion blur to the human eye and reducing image quality. May cause discomfort. Therefore, how to improve the image blurring phenomenon of such a display device is one of the current topics in the industry.
依據本發明之一方面,提出一種改善影像動態模糊的顯示方法,包括以下步驟。接收影像信號,影像信號包括多個影像訊框。依序於多個訊框區間顯示多個影像訊框於顯示面板, 各訊框區間包括垂直遮沒區間以及資料掃描區間。在各訊框區間提供背光致能信號用於控制顯示面板的背光單元開啟或關閉,背光致能信號包括第一致能脈衝,第一致能脈衝位於資料掃描區間,背光單元於第一致能脈衝的期間被開啟。 According to an aspect of the present invention, a display method for improving image motion blur is provided, which includes the following steps. Receiving an image signal, the image signal includes a plurality of image frames. A plurality of image frames are displayed on the display panel in a plurality of frame intervals, and each frame interval includes a vertical blanking interval and a data scanning interval. Providing a backlight enable signal for controlling the backlight unit of the display panel to be turned on or off in each frame interval, the backlight enable signal includes a first enable pulse, the first enable pulse is located in the data scan interval, and the backlight unit is in the first enablement The period of the pulse is turned on.
依據本發明之另一方面,提出一種改善影像動態模糊的顯示裝置。顯示裝置包括顯示面板、背光單元、顯示驅動電路、以及背光控制電路。顯示驅動電路用以接收影像信號,影像信號包括多個影像訊框,且顯示驅動電路依序於多個訊框區間驅動顯示面板顯示複數個影像訊框,各訊框區間包括垂直遮沒區間以及資料掃描區間。背光控制電路用以提供背光致能信號以控制背光單元開啟或關閉。其中在各訊框區間中,背光致能信號包括第一致能脈衝,第一致能脈衝位於資料掃描區間,背光單元於第一致能脈衝的期間被開啟。 According to another aspect of the present invention, a display device for improving image motion blur is proposed. The display device includes a display panel, a backlight unit, a display driving circuit, and a backlight control circuit. The display driving circuit is configured to receive the image signal, and the image signal comprises a plurality of image frames, and the display driving circuit drives the display panel to display the plurality of image frames in sequence, wherein each frame interval includes a vertical blanking interval and Data scan interval. The backlight control circuit is configured to provide a backlight enable signal to control the backlight unit to be turned on or off. In each frame interval, the backlight enable signal includes a first enable pulse, the first enable pulse is located in the data scan interval, and the backlight unit is turned on during the first enable pulse.
2‧‧‧顯示裝置 2‧‧‧Display device
200‧‧‧顯示面板 200‧‧‧ display panel
202‧‧‧背光單元 202‧‧‧Backlight unit
204‧‧‧顯示驅動電路 204‧‧‧Display drive circuit
206‧‧‧背光控制電路 206‧‧‧Backlight control circuit
P1‧‧‧第一致能脈衝 P1‧‧‧First enabling pulse
P2‧‧‧第二致能脈衝 P2‧‧‧Secondary Pulse
P3‧‧‧第三致能脈衝 P3‧‧‧ third enabling pulse
Pv‧‧‧遮沒致能脈衝 Pv‧‧‧masking enable pulse
d1、d2、d3、d4‧‧‧延遲間隔 D1, d2, d3, d4‧‧‧ delay interval
t1、t2‧‧‧第一致能脈衝P1的開始時間 T1, t2‧‧‧ start time of the first enable pulse P1
S100‧‧‧接收包括多個影像訊框的影像信號 S100‧‧‧ Receive image signals including multiple video frames
S102‧‧‧依序於多個訊框區間顯示多個影像訊框於顯示面板,各訊框區間包括垂直遮沒區間以及資料掃描區間 S102‧‧‧ Display multiple image frames on the display panel in multiple frame intervals, each frame interval includes vertical blanking interval and data scanning interval
S104‧‧‧在各訊框區間提供背光致能信號用於控制顯示面板的背光單元開啟或關閉,背光致能信號包括第一致能脈衝,第一致能脈衝位於資料掃描區間,背光單元於第一致能脈衝的期間被開啟 S104‧‧‧ providing a backlight enable signal for controlling the backlight unit of the display panel to be turned on or off in each frame interval, the backlight enable signal includes a first enable pulse, the first enable pulse is located in the data scan interval, and the backlight unit is The period of the first consistent pulse is turned on
第1圖繪示依據本發明一實施例顯示方法的流程圖。 FIG. 1 is a flow chart showing a display method according to an embodiment of the invention.
第2圖繪示依據本發明一實施例顯示裝置的方塊圖。 2 is a block diagram of a display device in accordance with an embodiment of the present invention.
第3A圖繪示依據本發明一實施例的信號時序示意圖。 FIG. 3A is a schematic diagram of signal timing according to an embodiment of the invention.
第3B圖繪示依據本發明一實施例的信號時序示意圖。 FIG. 3B is a schematic diagram of signal timing according to an embodiment of the invention.
第4圖繪示依據本發明一實施例的依據垂直同步信號產生背光致能信號的示意圖。 FIG. 4 is a schematic diagram of generating a backlight enable signal according to a vertical synchronization signal according to an embodiment of the invention.
第5圖繪示依據本發明一實施例第一致能脈衝在多個影像訊 框中的延遲間隔示意圖。 FIG. 5 is a schematic diagram showing the delay interval of a first enable pulse in a plurality of video frames according to an embodiment of the invention.
第6圖繪示依據本發明多個實施例的第一致能脈衝延遲間隔的變化示意圖。 FIG. 6 is a schematic diagram showing changes in the delay interval of the first enable pulse according to various embodiments of the present invention.
第7A圖、第7B圖及第7C圖繪示依據本發明一實施例背光致能信號包括多個致能脈衝的示意圖。 7A, 7B, and 7C are schematic diagrams showing a backlight enable signal including a plurality of enable pulses according to an embodiment of the invention.
第8圖繪示依據本發明一實施例依據本發明一實施例背光致能信號包括遮沒致能脈衝的示意圖。 FIG. 8 is a schematic diagram of a backlight enable signal including a blanking enable pulse according to an embodiment of the invention.
第9圖繪示依據本發明一實施例依據本發明一實施例調整垂直遮沒區間的示意圖。 FIG. 9 is a schematic diagram of adjusting a vertical blanking interval according to an embodiment of the invention.
一般的透射式液晶顯示器包括有顯示面板以及背光單元(Backlight Unit),背光單元包括光源以照射其前方的顯示面板,光源例如是發光二極體(Light-Emitting Diode,LED)或冷陰極螢光燈管(Cold Cathode Fluorescent Lamps,CCFL)。藉由控制背光單元的開或關操作,例如以高於人眼能察覺的頻率控制背光單元是否開啟,使得液晶像素並非於完整的影像訊框期間維持被點亮的狀態,如此可以有效減緩動態模糊的現象。 A general transmissive liquid crystal display includes a display panel and a backlight unit. The backlight unit includes a light source to illuminate a display panel in front of the light source, such as a light-emitting diode (LED) or a cold cathode fluorescent light. Cold Cathode Fluorescent Lamps (CCFL). By controlling the opening or closing operation of the backlight unit, for example, controlling whether the backlight unit is turned on at a frequency higher than the human eye can perceive, so that the liquid crystal pixel is not maintained in the illuminated state during the complete image frame, thereby effectively slowing down the dynamics. Blurred phenomenon.
以下說明本發明提出的顯示方法及顯示裝置,請同時參考第1圖以及第2圖,第1圖繪示依據本發明一實施例顯示方法的流程圖,第2圖繪示依據本發明一實施例顯示裝置的方塊圖。如第1圖所示的改善影像動態模糊的顯示方法,包括以下步驟。步驟S100:接收影像信號,影像信號包括多個影像訊框。步 驟S102:依序於多個訊框區間顯示多個影像訊框於顯示面板,各訊框區間包括垂直遮沒區間(Vertical Blanking Interval,VBI)以及資料掃描區間。步驟S104:在各訊框區間提供背光致能信號用於控制顯示面板的背光單元開啟或關閉,背光致能信號包括第一致能脈衝,第一致能脈衝位於資料掃描區間,背光單元於第一致能脈衝的期間被開啟。 The display method and the display device proposed by the present invention are described below. Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 1 is a flow chart showing a display method according to an embodiment of the present invention, and FIG. 2 is a view showing an embodiment of the present invention. An example block diagram of the display device. The method for improving the image blurring as shown in FIG. 1 includes the following steps. Step S100: Receive an image signal, where the image signal includes a plurality of image frames. Step S102: Display a plurality of image frames on the display panel in a plurality of frame intervals, and each frame interval includes a Vertical Blanking Interval (VBI) and a data scanning interval. Step S104: providing a backlight enable signal for controlling the backlight unit of the display panel to be turned on or off in each frame interval, the backlight enable signal includes a first enable pulse, the first enable pulse is located in the data scan interval, and the backlight unit is in the first The period of the consistent energy pulse is turned on.
如第2圖所示的顯示裝置2,包括顯示面板200、背光單元202、顯示驅動電路204、以及背光控制電路206。顯示驅動電路204用以接收影像信號(步驟S100),影像信號包括多個影像訊框,且顯示驅動電路204依序於多個訊框區間驅動顯示面板200顯示複數個影像訊框(步驟S102),各訊框區間包括垂直遮沒區間以及資料掃描區間。背光控制電路206用以提供背光致能信號以控制背光單元202開啟或關閉。其中在各訊框區間中,背光致能信號包括第一致能脈衝,第一致能脈衝位於資料掃描區間,背光單元202於第一致能脈衝的期間被開啟(步驟S104)。 The display device 2 as shown in FIG. 2 includes a display panel 200, a backlight unit 202, a display drive circuit 204, and a backlight control circuit 206. The display driving circuit 204 is configured to receive the image signal (step S100), and the image signal includes a plurality of image frames, and the display driving circuit 204 drives the display panel 200 to display the plurality of image frames in sequence according to the plurality of frame intervals (step S102). Each frame interval includes a vertical blanking interval and a data scanning interval. The backlight control circuit 206 is configured to provide a backlight enable signal to control the backlight unit 202 to be turned on or off. In each frame interval, the backlight enable signal includes a first enable pulse, the first enable pulse is located in the data scan interval, and the backlight unit 202 is turned on during the first enable pulse (step S104).
如第2圖所示,顯示驅動電路204用以驅動顯示面板200顯示影像資料,背光控制電路206用以控制背光單元202開啟的時間點,決定何時將光源點亮或熄滅。在一實施例中,背光控制電路206可由顯示驅動電路204接收相關的控制信號,以決定背光單元202的控制時序。 As shown in FIG. 2, the display driving circuit 204 is configured to drive the display panel 200 to display image data, and the backlight control circuit 206 is configured to control the time point when the backlight unit 202 is turned on to determine when to turn on or off the light source. In an embodiment, backlight control circuit 206 can receive associated control signals from display drive circuit 204 to determine the control timing of backlight unit 202.
以下更搭配第3A圖及第3B圖所繪示的信號時序示意圖以清楚說明上述的顯示方法及顯示裝置。依序於多個訊框區 間顯示多個影像訊框於顯示面板200,多個訊框區間例如包括第3A圖所繪示的第一影像訊框以及第二影像訊框,其中每個訊框區間包括垂直遮沒區間(VBI)以及資料掃描區間。如第3圖的面板掃描信號時序圖所示,在垂直遮沒區間時顯示面板200沒有接收驅動資料,而在資料掃描區間顯示驅動電路204可以逐列(row)依序提供顯示影像資料至顯示面板200,例如對於具有N列的顯示面板200,在資料掃描區間依序驅動第1列Row 1、第2列Row 2……、第N-1列Row N-1、第N列Row N。 The signal timing diagrams shown in FIGS. 3A and 3B are further described below to clearly illustrate the above display method and display device. The plurality of frame frames are displayed on the display panel 200 in sequence, and the plurality of frame segments include, for example, the first image frame and the second image frame illustrated in FIG. 3A, wherein each frame The interval includes the vertical blanking interval (VBI) and the data scanning interval. As shown in the panel scan signal timing diagram of FIG. 3, the display panel 200 does not receive the drive data in the vertical blanking interval, and the data scan interval display drive circuit 204 can sequentially display the display image data to the display in a row-by-row manner. For the panel 200, for example, for the display panel 200 having N columns, the first column Row 1, the second column Row 2, the N-1 column Row N-1, and the Nth row Row N are sequentially driven in the data scanning interval.
由背光控制電路206所提供的背光致能信號包括第一致能脈衝P1,第一致能脈衝P1的期間是位於資料掃描區間,而背光單元202於第一致能脈衝P1的期間被開啟。第3A圖所繪示的實施例,在各訊框區間中,第一致能脈衝P1的開始時間相同,第一致能脈衝的開始時間例如是第一致能脈衝前緣(leading edge)的時間點。亦即,於顯示每個影像訊框時,背光單元202於固定時間被開啟,且背光單元202被開啟的時間固定位於垂直遮沒區間結束之後。此外,背光控制電路206亦可用以調整第一致能脈衝P1的時間長度,在相同的背光強度下,較長的第一致能脈衝P1可以提供較佳的顯示畫面亮度。 The backlight enable signal provided by the backlight control circuit 206 includes a first enable pulse P1 during which the period of the first enable pulse P1 is located in the data scan interval and the backlight unit 202 is turned on during the first enable pulse P1. In the embodiment illustrated in FIG. 3A, in each frame interval, the start time of the first enable pulse P1 is the same, and the start time of the first enable pulse is, for example, the leading edge of the first enable pulse. Time point. That is, when each image frame is displayed, the backlight unit 202 is turned on at a fixed time, and the time when the backlight unit 202 is turned on is fixed after the end of the vertical blanking interval. In addition, the backlight control circuit 206 can also be used to adjust the length of the first enable pulse P1. Under the same backlight intensity, the longer first enable pulse P1 can provide better display picture brightness.
第3B圖繪示依據本發明一實施例的信號時序示意圖,在此實施例中,顯示面板200所顯示的影像包括多個影像訊框,其中多個影像訊框包括接續的第一影像訊框及第二影像訊框,背光單元202被開啟的時間點,在接續的第一影像訊框及第二影 像訊框當中不相同,亦即,在第一影像訊框中以及在第二影像訊框中,第一致能脈衝P1的開始時間不相同。 FIG. 3B is a schematic diagram of signal timing according to an embodiment of the present invention. In this embodiment, the image displayed by the display panel 200 includes a plurality of image frames, wherein the plurality of image frames include the succeeding first image frame. And the second image frame, the time point when the backlight unit 202 is turned on is different among the first image frame and the second image frame, that is, in the first image frame and in the second image frame. In the frame, the start time of the first enable pulse P1 is different.
如第3B圖所示,在第一影像訊框中第一致能脈衝P1的開始時間為t1,在第二影像訊框中第一致能脈衝P1的開始時間為t2,其中t1與t2不相等。在接續的第一影像訊框與第二影像訊框中,背光單元202開啟的時間係對應到顯示面板200不同列的掃描時間,因此可將動態模糊情形有效分散在畫面中的不同位置,提升影像品質。類似地,背光控制電路206亦可用以調整第一致能脈衝P1的時間長度。 As shown in FIG. 3B, the start time of the first enable pulse P1 in the first image frame is t1, and the start time of the first enable pulse P1 in the second image frame is t2, where t1 and t2 are not equal. In the succeeding first image frame and the second image frame, the time when the backlight unit 202 is turned on corresponds to the scanning time of different columns of the display panel 200, so that the dynamic blurring situation can be effectively dispersed in different positions in the screen, thereby improving Image quality. Similarly, the backlight control circuit 206 can also be used to adjust the length of time of the first enable pulse P1.
如第3B圖所示的實施例,背光單元在資料掃描區間被開啟,而藉由在接續的影像訊框中,改變背光單元的開啟時間,能夠避免動態模糊的現象固定集中在畫面中的特定位置,相當於在不同的影像訊框中將動態模糊的效果分散在畫面的不同位置,如此能夠減輕人眼觀賞影像的不適感,改善動態模糊情形。 In the embodiment shown in FIG. 3B, the backlight unit is turned on in the data scanning interval, and by changing the turn-on time of the backlight unit in the connected image frame, it is possible to prevent the phenomenon of dynamic blurring from being fixed in the screen. The position is equivalent to dispersing the effect of dynamic blurring in different positions of the image frame in different image frames, thereby reducing the discomfort of the human eye to view the image and improving the dynamic blurring situation.
此外,由於背光單元並非於整個訊框區間維持開啟,因此畫面亮度可能會受到影響,而在訊框區間中,垂直遮沒區間的長度相較於資料掃描區間的長度要短得多,本發明由於在資料掃描區間開啟背光單元,因此可以有足夠長的時間開啟背光單元,改善畫面亮度,而不需要大幅增加背光單元的發光強度,能夠降低背光單元的生產成本。 In addition, since the backlight unit is not kept open throughout the frame interval, the brightness of the screen may be affected, and in the frame interval, the length of the vertical blanking interval is much shorter than the length of the data scanning interval, and the present invention Since the backlight unit is turned on in the data scanning interval, the backlight unit can be turned on for a long enough time to improve the brightness of the screen without greatly increasing the illumination intensity of the backlight unit, and the production cost of the backlight unit can be reduced.
而對於一些液晶顯示器的驅動電路,相關控制信號 可能還包括垂直同步(Vsync)信號,垂直同步信號在垂直遮沒區間包括一個垂直同步脈衝,以控制顯示信號驅動時序。在一實施例中,背光致能信號可依據此垂直同步脈衝而產生。 For some liquid crystal display driving circuits, the related control signal may further include a vertical sync (Vsync) signal, and the vertical sync signal includes a vertical sync pulse in the vertical blanking interval to control the display signal driving timing. In an embodiment, the backlight enable signal can be generated in accordance with the vertical sync pulse.
第4圖繪示依據本發明一實施例的依據垂直同步信號產生背光致能信號的示意圖。顯示驅動電路204可用以提供垂直同步信號,如第4圖所示,垂直同步信號於垂直遮沒區間中包括一垂直同步脈衝,背光控制電路206可依據垂直同步脈衝產生背光致能信號。如此可使得背光致能信號的時序依據垂直同步脈衝而決定,而相對同步於垂直遮沒區間,能夠有效控制於資料掃描區間開啟背光單元202,並且有效控制在接續的影像訊框中於不同時間開啟背光單元202。 FIG. 4 is a schematic diagram of generating a backlight enable signal according to a vertical synchronization signal according to an embodiment of the invention. The display driving circuit 204 can be used to provide a vertical synchronizing signal. As shown in FIG. 4, the vertical synchronizing signal includes a vertical synchronizing pulse in the vertical blanking interval, and the backlight control circuit 206 can generate a backlight enable signal according to the vertical synchronizing pulse. In this way, the timing of the backlight enable signal can be determined according to the vertical sync pulse, and relatively synchronous with the vertical blanking interval, the backlight unit 202 can be effectively controlled in the data scanning interval, and the continuous control of the image frame can be effectively controlled at different times. The backlight unit 202 is turned on.
依據垂直同步脈衝產生背光致能信號可以有多種實作方式,以下提供一種可能實施例。第5圖繪示依據本發明一實施例第一致能脈衝在多個影像訊框中的延遲間隔示意圖,在此實施例中,背光控制電路206可延遲垂直同步脈衝一時間間隔以產生掃描垂直同步(Scanning Vsync)脈衝,此時間間隔在接續的不同影像訊框中長度不相同,使得掃描垂直同步脈衝在接續的影像訊框中開始時間不相同。接著背光控制電路206可增加掃描垂直同步脈衝的時間,即加大脈衝的寬度,以產生第一致能脈衝P1,這是由於相較於一般液晶顯示器中垂直同步脈衝的時間長度,於一個影像訊框中所需的背光開啟時間可能較長,因此可以包括此加大脈衝寬度的步驟。此實施例的產生背光致能信號的方法步驟僅 為示例性說明,本發明並不限定於此實施例。 There are a number of implementations for generating a backlight enable signal based on a vertical sync pulse. A possible embodiment is provided below. FIG. 5 is a schematic diagram showing a delay interval of a first enable pulse in a plurality of video frames according to an embodiment of the invention. In this embodiment, the backlight control circuit 206 can delay the vertical sync pulse by a time interval to generate a scan vertical. Synchronization (Scanning Vsync) pulse, this time interval is different in the length of the different video frames, so that the scanning vertical sync pulse starts at different times in the connected video frame. Then, the backlight control circuit 206 can increase the time for scanning the vertical sync pulse, that is, increase the width of the pulse to generate the first enable pulse P1, which is due to the length of time of the vertical sync pulse in the general liquid crystal display, in one image. The backlight turn-on time required for the frame may be longer, so this step of increasing the pulse width may be included. The method steps for generating the backlight enable signal of this embodiment are merely illustrative, and the present invention is not limited to this embodiment.
如第5圖所示,在各訊框區間中,第一致能脈衝P1的開始時間與垂直遮沒區間的結束時間之間的延遲間隔d1、d2、d3、d4不相同。在一實施例中,這些延遲間隔d1、d2、d3、d4是週期性變化,例如是d1->d2->d3->d4->d1->d2->d3->d4如此的週期性變化,如此可簡化背光控制電路206的軟體或硬體設計。需說明的是,在第5圖中為了簡化圖示,因此在一個週期中僅繪示4種延遲間隔,以清楚表示週期性變化的情形。於實作中,一個週期可能包括更多種不同的延遲間隔。舉例而言,若以1秒為延遲間隔週期性變化的一個週期長度,影像訊框率(Frames Per Second,FPS)為每秒30個訊框,則30個影像訊框形成一個週期,一個週期可包括30種不同的延遲間隔(d1~d30),若顯示面板的解析度為1920x1080(具有1080個列),則第一致能脈衝P1的寬度大約可對應於1080/30=36個列的資料掃描時間。此處的週期長度、訊框率、面板解析度皆僅是示例性說明,可以依據設計需求以及實際應用調整這些參數。 As shown in FIG. 5, in each frame section, the delay intervals d1, d2, d3, and d4 between the start time of the first enable pulse P1 and the end time of the vertical blanking interval are different. In an embodiment, the delay intervals d1, d2, d3, and d4 are periodic changes, for example, periodic changes such as d1->d2->d3->d4->d1->d2->d3->d4 This simplifies the software or hardware design of the backlight control circuit 206. It should be noted that in FIG. 5, in order to simplify the illustration, only four kinds of delay intervals are shown in one cycle to clearly indicate the situation of periodic changes. In practice, a cycle may include a greater variety of delay intervals. For example, if the frame period Per Second (FPS) is 30 frames per second with a period of one second as the delay interval, 30 frames form one cycle and one cycle. It can include 30 different delay intervals (d1~d30). If the resolution of the display panel is 1920x1080 (with 1080 columns), the width of the first enable pulse P1 can be approximately corresponding to 1080/30=36 columns. Data scan time. The cycle length, frame rate, and panel resolution are only illustrative examples, and can be adjusted according to design requirements and practical applications.
如第5圖所示第一致能脈衝P1的延遲間隔d1、d2、d3、d4,其變化情形可以有多種實施方式,第6圖繪示依據本發明多個實施例的第一致能脈衝P1延遲間隔的變化示意圖,第6圖中分別以背光致能信號a~背光致能信號e繪示不同的實施方式。如前所述,為了簡化圖示,在第6圖中每個背光致能信號a~e僅繪示4種不同延遲間隔d1~d4,實作中則可能包括更多種或更少 種的不同延遲間隔。此外,在以下的第6圖中,不同的延遲間隔以d1<d2<d3<d4作為範例說明,其中d1可以是0。 As shown in FIG. 5, the delay intervals d1, d2, d3, and d4 of the first enable pulse P1 may be varied in various embodiments. FIG. 6 illustrates a first enable pulse according to various embodiments of the present invention. Schematic diagram of the change of the P1 delay interval, and different embodiments are illustrated in FIG. 6 with the backlight enable signal a~the backlight enable signal e, respectively. As mentioned above, in order to simplify the illustration, each of the backlight enable signals a~e in FIG. 6 only shows four different delay intervals d1~d4, and in practice, more or less kinds of Different delay intervals. Further, in the following FIG. 6, different delay intervals are exemplified by d1 < d2 < d3 < d4, where d1 may be 0.
背光致能信號a:延遲間隔是週期性變化,且延遲間隔是週期性遞增。例如延遲間隔的週期性變化情形為d1->d2->d3->d4->d1->d2->d3->...。此例中在不同影像訊框中背光單元202開啟的時間,係依序對應於顯示面板200由頂端到底端的列掃描時間,到達底端之後再重覆回到頂端。以此方式實作,背光開啟的變化情形為規律性,且大部分接續的影像訊框中背光開啟的時間變化幅度不大。 The backlight enable signal a: the delay interval is a periodic change, and the delay interval is a periodic increase. For example, the periodic variation of the delay interval is d1->d2->d3->d4->d1->d2->d3->. In this example, the time when the backlight unit 202 is turned on in different image frames corresponds to the column scanning time of the display panel 200 from the top end to the bottom end, and then reaches the bottom end and then returns to the top end. In this way, the change of the backlight on is regular, and the time of the backlight on most of the successive image frames does not change much.
背光致能信號b:延遲間隔是週期性變化,且延遲間隔是週期性遞減。例如延遲間隔的週期性變化情形為d4->d3->d2->d1->d4->d3->d2->...。此例中在不同影像訊框中背光單元202開啟的時間,係依序對應於顯示面板200由底端到頂端的列掃描時間,到達頂端之後再重覆回到底端。 The backlight enable signal b: the delay interval is a periodic change, and the delay interval is a periodic decrease. For example, the periodic variation of the delay interval is d4->d3->d2->d1->d4->d3->d2->. In this example, the time when the backlight unit 202 is turned on in different image frames corresponds to the column scanning time of the display panel 200 from the bottom end to the top end, and then reaches the top end and then returns to the bottom end.
背光致能信號c:延遲間隔是週期性變化,且延遲間隔是週期性的交替遞增與遞減。例如延遲間隔的週期性變化情形為d1->d2->d3->d4->d3->d2->d1->d2->d3...。以此方式實作,背光開啟的變化情形為規律性,且對於所有接續的影像訊框,背光開啟的時間變化幅度不大,皆為對應到鄰近的列掃描時間,如此能夠有效降低觀看影像時的畫面閃爍現象。 The backlight enable signal c: the delay interval is a periodic change, and the delay interval is a periodic alternating increment and decrement. For example, the periodic variation of the delay interval is d1->d2->d3->d4->d3->d2->d1->d2->d3.... In this way, the change of the backlight on is regular, and for all the successive video frames, the time of the backlight turn-on is not large, which is corresponding to the adjacent column scan time, which can effectively reduce the viewing time. The picture flickers.
背光致能信號d:延遲間隔是小於下界LB或大於上界UB,其中下界LB小於上界UB,例如d1<LB、d2<LB、d3>UB、 d4>UB,延遲間隔可以是週期性變化,亦可以是非週期性變化。此例中在背光單元202開啟的時間,係對應於顯示面板200靠近頂端的列掃描時間,或是顯示面板200靠近底端的列掃描時間。以此方式實作,可將動態模糊現象侷限在靠近顯示面板200頂端或底端的位置,不論液晶顯示裝置是應用於電視、電腦螢幕、或手機螢幕,此位置為使用者較少關注的視野範圍,因此較能容許動態模糊發生,在靠近影像畫面中央的部分,則能有效改善動態模糊的情形。 The backlight enable signal d: the delay interval is smaller than the lower bound LB or greater than the upper bound UB, wherein the lower bound LB is smaller than the upper bound UB, for example, d1 < LB, d2 < LB, d3 > UB, d4 > UB, and the delay interval may be a periodic change It can also be a non-periodic change. In this example, when the backlight unit 202 is turned on, it corresponds to the column scanning time of the display panel 200 near the top end, or the column scanning time of the display panel 200 near the bottom end. In this way, the dynamic blurring phenomenon can be limited to a position close to the top or bottom of the display panel 200, regardless of whether the liquid crystal display device is applied to a television, a computer screen, or a mobile phone screen, which is a field of view that the user pays less attention to. Therefore, dynamic blurring is more likely to occur, and the situation near the center of the image frame can effectively improve the dynamic blur.
背光致能信號e:延遲間隔是隨機性變化,即沒有依據特定規則改變第一致能脈衝的開始時間與垂直遮沒區間的結束時間之間的延遲間隔。以此方式實作,可將動態模糊現象隨機分散在畫面中的不同位置。 The backlight enable signal e: the delay interval is a random change, that is, the delay interval between the start time of the first enable pulse and the end time of the vertical blanking interval is not changed according to a specific rule. In this way, the dynamic blurring phenomenon can be randomly dispersed in different positions in the picture.
如第6圖所示的多種實施方式,藉由改變背光開啟時間的延遲間隔,能夠有效將動態模糊現象分散在畫面中的不同位置,相當於將動態模糊的程度平均分散在畫面中,而降低動態模糊的嚴重程度,又或是將動態模糊侷限在特定的視野範圍。如此能夠使得使用者在觀看時,感受到較輕微的動態模糊情形。 As shown in FIG. 6 , by changing the delay interval of the backlight turn-on time, the dynamic blur phenomenon can be effectively dispersed at different positions in the picture, which is equivalent to dispersing the degree of dynamic blur on the screen evenly. The severity of dynamic blurring, or the limitation of dynamic blurring to a specific field of view. This enables the user to feel a slight dynamic blur when viewing.
在使用動態調整控制背光開啟時間的方法中,為了能夠進一步增強畫面亮度,背光致能信號更可以包括多個致能脈衝。第7A圖、第7B圖及第7C圖繪示依據本發明一實施例背光致能信號包括多個致能脈衝的示意圖。如第7A圖所示,在各訊框區間中,背光致能信號更包括第二致能脈衝P2,第二致能脈衝 P2與第一致能脈衝P1皆是位於資料掃描區間,背光單元202於第一致能脈衝P1以及第二致能脈衝P2的期間被開啟,第二致能脈衝P2的開始時間(例如是脈衝前緣,leading edge)接近且晚於第一致能脈衝P1的結束時間(例如是脈衝後緣,trailing edge)。 In the method of using the dynamic adjustment control backlight turn-on time, in order to further enhance the picture brightness, the backlight enable signal may further include a plurality of enable pulses. 7A, 7B, and 7C are schematic diagrams showing a backlight enable signal including a plurality of enable pulses according to an embodiment of the invention. As shown in FIG. 7A, in each frame interval, the backlight enable signal further includes a second enable pulse P2, and the second enable pulse P2 and the first enable pulse P1 are both located in the data scan interval, and the backlight unit 202 During the period of the first enable pulse P1 and the second enable pulse P2, the start time of the second enable pulse P2 (for example, the leading edge) is close to and later than the end of the first enable pulse P1. Time (for example, trailing edge).
另外在一實施例中,如第7B圖所示,在各訊框區間中,背光致能信號包括第一致能脈衝P1、第二致能脈衝P2、以及第三致能脈衝P3。第三致能脈衝P3同樣是位於資料掃描區間,背光單元202於第一致能脈衝P1、第二致能脈衝P2、以及第三致能脈衝P3的期間被開啟,第三致能脈衝P3的開始時間接近且晚於第二致能脈衝P2的結束時間。 In another embodiment, as shown in FIG. 7B, in each frame interval, the backlight enable signal includes a first enable pulse P1, a second enable pulse P2, and a third enable pulse P3. The third enable pulse P3 is also located in the data scanning interval, and the backlight unit 202 is turned on during the first enable pulse P1, the second enable pulse P2, and the third enable pulse P3, and the third enable pulse P3 The start time is close to and later than the end time of the second enable pulse P2.
在另一實施例中,如第7C圖所示,可以類似於第7B圖所示的實施例,背光致能信號包括第一致能脈衝P1、第二致能脈衝P2、以及第三致能脈衝P3,而在第7C圖所示的實施例中,第一致能脈衝P1在各訊框區間的開始時間相同。在第7A圖、第7B圖及第7C圖所示的實施例中,藉由在資料掃描區間使用多個致能脈衝,而能夠有效增強畫面亮度。而對於此實作方式的多個致能脈衝,在各訊框區間的開始時間可以相同,也可以在各個訊框區間中調整第一致能脈衝P1的延遲間隔變化情形,如同第6圖所繪示的多個實施例,於此不再贅述。 In another embodiment, as shown in FIG. 7C, the backlight enable signal may include a first enable pulse P1, a second enable pulse P2, and a third enabler, similar to the embodiment shown in FIG. 7B. Pulse P3, and in the embodiment shown in Fig. 7C, the first enable pulse P1 is the same at the start time of each frame interval. In the embodiments shown in FIGS. 7A, 7B, and 7C, the brightness of the screen can be effectively enhanced by using a plurality of enable pulses in the data scanning interval. For the plurality of enable pulses of the implementation mode, the start time of each frame interval may be the same, or the delay interval of the first enable pulse P1 may be adjusted in each frame interval, as shown in FIG. The various embodiments are illustrated and will not be further described herein.
在一實施例中,亦可以於垂直遮沒區間開啟背光單元202。第8圖繪示依據本發明一實施例依據本發明一實施例背光致能信號包括遮沒致能脈衝的示意圖。在各訊框區間中,背光 致能信號更包括遮沒致能脈衝Pv,遮沒致能脈衝Pv位於垂直遮沒區間,背光單元202於遮沒致能脈衝Pv的期間被開啟。在此實施例中,係利用垂直遮沒區間以及資料掃描區間皆開啟背光單元以增強畫面亮度。而對於此實作方式(於垂直遮沒區間開啟背光單元),在資料掃描區間亦可以包括多於一個致能脈衝,如第7A圖以及第7B圖所示,於此不再贅述。 In an embodiment, the backlight unit 202 can also be turned on in the vertical blanking interval. FIG. 8 is a schematic diagram of a backlight enable signal including a blanking enable pulse according to an embodiment of the invention. In each frame interval, the backlight enable signal further includes a blanking enable pulse Pv, the blanking enable pulse Pv is located in the vertical blanking interval, and the backlight unit 202 is turned on during the blanking of the enable pulse Pv. In this embodiment, the backlight unit is turned on by using the vertical blanking interval and the data scanning interval to enhance the brightness of the screen. For this implementation mode (turning on the backlight unit in the vertical blanking interval), more than one enabling pulse may be included in the data scanning interval, as shown in FIG. 7A and FIG. 7B, and details are not described herein again.
而為了改善畫面亮度,在一實施例中,顯示驅動電路204更可以調整各訊框區間中垂直遮沒區間相對於資料掃描區間的比例。舉例而言,可以在固定的訊框區間時間長度中,增加垂直遮沒區間的時間長度,亦即相對減少資料掃描區間的時間長度,範例可參考第9圖,其繪示依據本發明一實施例依據本發明一實施例調整垂直遮沒區間的示意圖。相較於第3圖~第8圖所繪示的例子,在第9圖中垂直遮沒區間相對於資料掃描區間的比例較大,如此即使第一致能脈衝P1的時間長度維持與第3圖~第8圖所示的相同,亦可以使得資料掃描區間中背光有開啟的時間涵蓋比例變大,因此能夠改善畫面亮度。 In order to improve the brightness of the screen, in an embodiment, the display driving circuit 204 can further adjust the ratio of the vertical blanking interval to the data scanning interval in each frame interval. For example, in the fixed frame interval time length, the length of the vertical blanking interval may be increased, that is, the time length of the data scanning interval may be relatively reduced. For example, reference may be made to FIG. 9 , which illustrates an implementation according to the present invention. Example of adjusting a vertical blanking interval according to an embodiment of the present invention. Compared with the example shown in FIG. 3 to FIG. 8 , the ratio of the vertical blanking interval to the data scanning interval is larger in FIG. 9 , so that the length of the first enabling pulse P1 is maintained and the third time. The same as shown in Fig. 8 can also make the time when the backlight is turned on in the data scanning interval becomes larger, so that the brightness of the screen can be improved.
需說明的是,如第3圖~第9圖所繪示的垂直遮沒區間相對於資料掃描區間的比例可能與實作中的比例不同,如第9圖繪示垂直遮沒區間與資料掃描區間的時間長度相近,以使得圖示能夠清楚呈現此實施例方法,實作中的比例需視面板特性及設計需求而調整。舉例而言,在第3圖的實施例中,垂直遮沒區間相對於資料掃描區間的比例可以是2%,而在第9圖的實施例中, 垂直遮沒區間相對於資料掃描區間的比例可以是20%。 It should be noted that the ratio of the vertical blanking interval to the data scanning interval as shown in Figures 3 to 9 may be different from the ratio in the actual implementation. For example, Figure 9 shows the vertical blanking interval and data scanning. The lengths of the intervals are similar so that the illustrations can clearly illustrate the method of this embodiment, and the ratio in practice is adjusted depending on panel characteristics and design requirements. For example, in the embodiment of FIG. 3, the ratio of the vertical blanking interval to the data scanning interval may be 2%, and in the embodiment of FIG. 9, the ratio of the vertical blanking interval to the data scanning interval Can be 20%.
而在第9圖所示的實施例中(調整垂直遮沒區間時間長度),在各訊框區間中第一致能脈衝P1的開始時間相同,於實作中也可以修改為調整背光開啟時間的延遲間隔(如第6圖所示)。此外,也可以在資料掃描區間包括多於一個致能脈衝(如第7A圖以及第7B圖所示),亦可以在垂直遮沒區間開啟背光單元202(如第8圖所示),其相關的方法已於前文說明,於此不再贅述。這些實施例的作法皆為可選擇性的且彼此互相不衝突,可以同時採用。 In the embodiment shown in FIG. 9 (adjusting the vertical obscuration interval time length), the start time of the first enable pulse P1 is the same in each frame interval, and may be modified to adjust the backlight turn-on time in practice. Delay interval (as shown in Figure 6). In addition, more than one enable pulse may be included in the data scan interval (as shown in FIGS. 7A and 7B), or the backlight unit 202 may be turned on in the vertical blanking interval (as shown in FIG. 8). The method has been explained in the foregoing, and will not be described here. The practices of these embodiments are all optional and do not conflict with each other and can be used simultaneously.
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.
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