TWI402822B - Driving method of a display - Google Patents
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本發明是有關於一種顯示器的驅動方法，且特別是有關於一種將紅-綠-藍影像資料(R-G-B image data)轉換為紅-綠-藍-白影像資料(R-G-B-W image data)之顯示器的驅動方法。 The present invention relates to a display driving method, and more particularly to a display for converting a red-green-blue image data into a display of RGBW image data. method.
具有高畫質、空間利用效率佳、低消耗功率、無輻射等優越特性之液晶顯示器(Liquid Crystal Display,LCD)已逐漸成為顯示器之主流。為滿足使用者的需求，各廠商均致力於高色彩重現(color reproduction)技術的開發，而高色彩重現技術的開發與液晶顯示器之背光源與彩色濾光膜的色飽和度(color saturation)息息相關。 A liquid crystal display (LCD) with superior image quality, good space utilization efficiency, low power consumption, and no radiation has gradually become the mainstream of displays. In order to meet the needs of users, all manufacturers are committed to the development of high color reproduction technology, and the development of high color reproduction technology and the color saturation of the backlight and color filter of liquid crystal display (color saturation) ) is closely related.
為了讓顯示器能夠有較佳的亮度表現，具有紅、綠、藍、白四種子畫素之顯示器已被提出，此類型的顯示器雖具有較佳的亮度表現，但色飽和度常會因為白色子畫素而有所降低。詳言之，當顯示器在顯示純色(如紅色、綠色、藍色)畫面時，若將白色子畫素開啟，將導致純色畫面色飽和度明顯降低；反之，若不將白色子畫素開啟，亦容易導致影像不連續的視覺感受。因此，白色子畫素的亮度控制便成為此類型之顯示器在驅動時的重要考量因素之一。換言之，如何在純色畫面的色飽和度與影像的連續性之間找到平衡點，是此類型之顯示器亟待解決的問題之一。 In order to enable the display to have better brightness performance, displays with red, green, blue and white seed pixels have been proposed. Although this type of display has better brightness performance, the color saturation is often caused by white sub-pictures. It has been reduced. In detail, when the display is displaying a solid color (such as red, green, blue) screen, if the white sub-pixel is turned on, the color saturation of the solid color picture will be significantly reduced; otherwise, if the white sub-pixel is not turned on, It is also easy to cause a discontinuous visual impression of the image. Therefore, the brightness control of white sub-pixels is one of the important considerations for this type of display when driving. In other words, how to find a balance between the color saturation of a solid color picture and the continuity of the image is one of the problems to be solved by this type of display.
目前，Kodak公司以及Canon公司已分別在其美國專利US 6,885,380號以及美國專利US 5,929,842號中提及如何從紅-綠-藍影像資料(R-G-B image data)計算出白色子畫素的顯示資料(W display data)。然而，上述專利的目的皆在於排除顯示影像發生鋸齒狀邊緣，其並未考慮顯示器之色飽和度是否會下降。 At present, Kodak and Canon have mentioned how to calculate white sub-pixel display data from RGB image data in US Patent No. 6,885,380 and U.S. Patent No. 5,929,842, respectively. Display data). However, the purpose of the above patents is to eliminate the jagged edges of the display image, which does not consider whether the color saturation of the display will decrease.
本發明提供一種顯示器的驅動方法，其適於將紅-綠-藍影像資料轉換為紅-綠-藍-白影像資料。 The invention provides a driving method of a display, which is suitable for converting red-green-blue image data into red-green-blue-white image data.
本發明提出一種顯示器的驅動方法，其適於驅動一具有紅色次畫素、綠色次畫素、藍色次畫素以及白色次畫素之顯示器，當輸入一紅-綠-藍影像資料至顯示器時，顯示器能夠顯示一最大色域，而顯示器的驅動方法先於顯示器所能夠顯示的最大色域內，選定一目標色域。接著，將紅-綠-藍影像資料轉換為一紅-綠-藍-白影像資料，以使顯示器能夠顯示目標色域。之後，將紅-綠-藍-白影像資料輸入至顯示器，以驅動顯示器。 The invention provides a driving method for a display, which is suitable for driving a display having a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, when inputting a red-green-blue image data to the display The display can display a maximum color gamut, and the display driving method selects a target color gamut prior to the maximum color gamut that the display can display. Next, the red-green-blue image data is converted into a red-green-blue-white image data to enable the display to display the target color gamut. After that, the red-green-blue-white image data is input to the display to drive the display.
在本發明之一實施例中，上述目標色域小於最大色域。 In an embodiment of the invention, the target color gamut is smaller than the maximum color gamut.
在本發明之一實施例中，將紅-綠-藍影像資料轉換為紅-綠-藍-白影像資料的方法包括：當紅-綠-藍影像資料僅包括單一純色的資料時，根據紅-綠-藍影像資料以及目標色域，計算出白色次畫素的一最大亮度LWmax，並令白色次畫素顯示一預設亮度LWdefault，其中預設亮度LWdefault 小於最大亮度LWmax；以及當紅-綠-藍影像資料包括多種純色的資料時，根據目標色域以及不同的紅-綠-藍影像資料，計算出白色次畫素的一對應亮度，並令白色次畫素顯示對應亮度。 In an embodiment of the present invention, the method for converting red-green-blue image data into red-green-blue-white image data includes: when the red-green-blue image data includes only a single solid color data, according to red- The green-blue image data and the target color gamut, a maximum brightness LW max of the white sub-pixel is calculated, and the white sub-pixel displays a preset brightness LW default , wherein the preset brightness LW default is less than the maximum brightness LW max ; When the red-green-blue image data includes a plurality of solid colors, a corresponding brightness of the white sub-pixels is calculated according to the target color gamut and different red-green-blue image data, and the white sub-pixels are displayed corresponding brightness.
在本發明之一實施例中，上述之預設亮度LWdefault以及白色次畫素所顯示的對應亮度是記錄於一對照表(Look-Up Table,LUT)中。 In an embodiment of the invention, the preset brightness LW default and the corresponding brightness displayed by the white sub-pixel are recorded in a Look-Up Table (LUT).
在本發明之一實施例中，上述之最大亮度LWmax在CIELAB空間中，滿足下列條件：
其中，L threshold為2，LR max為顯示器在顯示紅色純色時，紅色次畫素能夠顯示的最大亮度，LG max為顯示器在顯示綠色純色時，綠色次畫素能夠顯示的最大亮度，LB max為顯示器在顯示藍色純色時，藍色次畫素能夠顯示的最大亮度。 Wherein, L threshold is 2, LR max is the maximum brightness that the red sub-pixel can display when the display displays red solid color, and LG max is the maximum brightness that the green sub-pixel can display when the display displays green solid color, LB max is The maximum brightness that the blue sub-pixel can display when the display shows a solid blue color.
在本發明之一實施例中，上述之最大亮度LWmax滿足下列條件：
其中，L threshold為第0階的亮度，LR max為顯示器在顯示紅色純色時，紅色次畫素能夠顯示的最大亮度，LG max為顯示器在顯示綠色純色時，綠色次畫素能夠顯示的最大亮度，LB max為顯示器在顯示藍色純色時，藍色次畫素能夠顯示的最大亮度。 Wherein, L threshold is the brightness of the 0th order, LR max is the maximum brightness that the red sub-pixel can display when the display displays the red solid color, and LG max is the maximum brightness that the green sub-pixel can display when the display displays the green solid color. LB max is the maximum brightness that the blue sub-pixel can display when the display displays a blue solid color.
本發明之顯示器的驅動方法可在不大幅度地犧牲色飽和度(color saturation)的情況下，有效提昇影像亮度(brightness)，並改善顯示影像不連續的情況。 The driving method of the display of the present invention can effectively improve the brightness of the image and improve the discontinuity of the displayed image without greatly sacrificing the color saturation.
為讓本發明之上述和其他目的、特徵和優點能更明顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下。 The above and other objects, features and advantages of the present invention will become more <RTIgt;
圖1為本發明一實施例之顯示器之驅動方法的流程示意圖。請參照圖1，本實施例之顯示器的驅動方法適於驅動一具有紅色次畫素、綠色次畫素、藍色次畫素以及白色次畫素之顯示器，當輸入一紅-綠-藍影像資料至顯示器時，顯示器能夠顯示一最大色域。此時，顯示器所能夠顯示的最大色域便獲得確定(S100)。在確定顯示器所能顯示的最大色域(S100)之後，接著於顯示器所能夠顯示的最大色域內，選定一目標色域(S110)。之後，將紅-綠-藍影像資料轉換為一紅-綠-藍-白影像資料，以使顯示器能夠顯示目標色域(S120)。最後，再將紅-綠-藍-白影像資料輸入至顯示器，以驅動顯示器(S130)。 FIG. 1 is a schematic flow chart of a driving method of a display according to an embodiment of the present invention. Referring to FIG. 1, the driving method of the display of the embodiment is adapted to drive a display having a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, when inputting a red-green-blue image. When the data is displayed to the display, the display can display a maximum color gamut. At this time, the maximum color gamut that the display can display is determined (S100). After determining the maximum color gamut that the display can display (S100), a target color gamut is selected (S110) in the maximum color gamut that the display can display. Thereafter, the red-green-blue image data is converted into a red-green-blue-white image data to enable the display to display the target color gamut (S120). Finally, the red-green-blue-white image data is input to the display to drive the display (S130).
在步驟S100、步驟S110與步驟S120中，顯示器所 能夠顯示的最大色域以及目標色域主要是由所採用之彩色濾光膜以及背光源來決定。在本實施例中，為了讓顯示器所顯示的影像具有高色飽和度，且不易於被使用者觀察到影像不連續的情況發生，可以採用色飽和度較高的彩色濾光膜，以使顯示器在被紅-綠-藍影像資料驅動時能夠顯示最大色域(例如為NTSC 108%)，並使顯示器在被紅-綠-藍-白影像資料驅動時，能夠顯示目標色域(例如NTSC 90%、NTSC 72%或NTSC 50%)。換言之，若採用色飽和度較高的彩色濾光膜(例如為NTSC 108%)，即使顯示器中的紅色次畫素、綠色次畫素或藍色次畫素在進行影像畫面的顯示時，白色次畫素的開啟雖會使顯示器的目標色域小於最大色域，但顯示器的目標色域仍然能夠維持在不錯的水準(例如NTSC 90%、NTSC 72%或NTSC 50%)，同樣能夠滿足產品規格的。 In step S100, step S110 and step S120, the display station The maximum color gamut that can be displayed and the target color gamut are mainly determined by the color filter film used and the backlight. In this embodiment, in order to make the image displayed by the display have high color saturation, and it is not easy for the user to observe that the image is discontinuous, a color filter film with higher color saturation may be used to make the display The maximum color gamut (for example, NTSC 108%) can be displayed when driven by red-green-blue image data, and the display can display the target color gamut when driven by red-green-blue-white image data (eg NTSC 90) %, NTSC 72% or NTSC 50%). In other words, if a color filter with a high color saturation (for example, NTSC 108%) is used, even if the red sub-pixel, green sub-pixel or blue sub-pixel in the display is displayed on the image screen, white The opening of the sub-pixel will make the target color gamut of the display smaller than the maximum color gamut, but the target color gamut of the display can still maintain a good level (such as NTSC 90%, NTSC 72% or NTSC 50%), which can also satisfy the product. Specifications.
值得注意的是，在本實施例中，無論紅-綠-藍影像資料是否僅包括單一純色的資料(例如：紅-綠-藍影像資料僅包含紅色影像資料、綠色影像資料或藍色影像資料)，本實施例皆會將白色次畫素開啟，並依據所顯示的影像資料來控制白色次畫素的穿透率(即白色次畫素所顯示的亮度)，以使顯示器所顯示出的影像不會有色飽和度偏低或不連續之情況發生。 It should be noted that, in this embodiment, whether the red-green-blue image data includes only a single solid color data (for example, the red-green-blue image data only includes red image data, green image data, or blue image data. In this embodiment, the white sub-pixels are turned on, and the transmittance of the white sub-pixels (ie, the brightness displayed by the white sub-pixels) is controlled according to the displayed image data, so that the display is displayed. The image does not have a low or discontinuous color saturation.
白色次畫素所顯示的亮度必須與其他次畫素所顯示的亮度匹配，白色次畫素所顯示的亮度過高或過低都有其缺點在。詳言之，白色次畫素所顯示的亮度越高，則顯示器的目標色域便越低，但顯示器較不易被使用者觀察到影 像不連續的現象；反之，白色次畫素所顯示的亮度越低，則顯示器的目標色域便越高，但顯示器較容易被使用者觀察到影像不連續的現象。很明顯地，在決定白色次畫素所顯示的亮度時，必須將其他次畫素所顯示的亮度納入考量，本發明於下述實施例中提出一種將紅-綠-藍影像資料轉換為紅-綠-藍-白影像資料的方法，然此方法僅是用以舉例說明，其並非用以限定本發明。 The brightness displayed by the white sub-pixel must match the brightness displayed by other sub-pixels, and the brightness displayed by the white sub-pixel is too high or too low. In detail, the higher the brightness displayed by the white sub-pixel, the lower the target color gamut of the display, but the display is less likely to be observed by the user. Like the phenomenon of discontinuity; on the contrary, the lower the brightness displayed by the white sub-pixel, the higher the target color gamut of the display, but the display is more likely to be observed by the user. Obviously, in determining the brightness displayed by the white sub-pixel, the brightness displayed by other sub-pixels must be taken into consideration. The present invention proposes to convert the red-green-blue image data into red in the following embodiments. - Green-blue-white image data method, which is for illustrative purposes only and is not intended to limit the invention.
圖2為本發明另一實施例之顯示器之驅動方法的流程示意圖。請參照圖2，在本實施例中，將紅-綠-藍影像資料轉換為紅-綠-藍-白影像資料的方法至少包括下列兩種情況。當紅-綠-藍影像資料僅包括單一純色的資料時(例如：紅-綠-藍影像資料僅包含紅色影像資料、綠色影像資料或藍色影像資料)，可根據紅-綠-藍影像資料以及目標色域，計算出白色次畫素的一最大亮度LWmax，並令白色次畫素顯示一預設亮度LWdefault，其中預設亮度LWdefault小於最大亮度LWmax(S122)。當紅-綠-藍影像資料包括多種純色的資料時(例如：紅-綠-藍影像資料不僅包含紅色影像資料、綠色影像資料或藍色影像資料)，根據目標色域以及不同的紅-綠-藍影像資料，計算出白色次畫素的一對應亮度，並令白色次畫素顯示對應亮度(S124)。值得一提的是，白色次畫素所顯示的各個對應亮度皆小於預設亮度LWdefault。此外，上述之預設亮度LWdefault以及白色次畫素所顯示的各個對應亮度都記錄於一對照表(Look-Up Table,LUT)中。 2 is a schematic flow chart of a driving method of a display according to another embodiment of the present invention. Referring to FIG. 2, in the embodiment, the method for converting red-green-blue image data into red-green-blue-white image data includes at least the following two cases. When the red-green-blue image data only includes a single solid color data (for example, the red-green-blue image data only includes red image data, green image data or blue image data), according to the red-green-blue image data and The target color gamut calculates a maximum brightness LW max of the white sub-pixel and causes the white sub-pixel to display a preset brightness LW default , wherein the preset brightness LW default is smaller than the maximum brightness LW max (S122). When the red-green-blue image data includes multiple solid colors (for example, the red-green-blue image data includes not only red image data, green image data, or blue image data), but also according to the target color gamut and different red-green colors. The blue image data calculates a corresponding brightness of the white sub-pixel and causes the white sub-pixel to display the corresponding brightness (S124). It is worth mentioning that each corresponding brightness displayed by the white sub-pixel is smaller than the preset brightness LW default . In addition, the preset brightness LW default and each corresponding brightness displayed by the white sub-pixel are recorded in a look-up table (LUT).
在本發明之一較佳實施例中，上述之最大亮度LWmax在CIELAB空間中，滿足下列條件：
其中，L threshold為2，LR max為顯示器在顯示紅色純色時，紅色次畫素能夠顯示的最大亮度，LG max為顯示器在顯示綠色純色時，綠色次畫素能夠顯示的最大亮度，LB max為顯示器在顯示藍色純色時，藍色次畫素能夠顯示的最大亮度。 Wherein, L threshold is 2, LR max is the maximum brightness that the red sub-pixel can display when the display displays red solid color, and LG max is the maximum brightness that the green sub-pixel can display when the display displays green solid color, LB max is The maximum brightness that the blue sub-pixel can display when the display shows a solid blue color.
在本發明之另一較佳實施例中，上述之最大亮度LWmax滿足下列條件：
其中，L threshold為第0階的亮度，LR max為顯示器在顯示紅色純色時，紅色次畫素能夠顯示的最大亮度，LG max為顯示器在顯示綠色純色時，綠色次畫素能夠顯示的最大亮度，LB max為顯示器在顯示藍色純色時，藍色次畫素能夠顯示的最大亮度。 Wherein, L threshold is the brightness of the 0th order, LR max is the maximum brightness that the red sub-pixel can display when the display displays the red solid color, and LG max is the maximum brightness that the green sub-pixel can display when the display displays the green solid color. LB max is the maximum brightness that the blue sub-pixel can display when the display displays a blue solid color.
由於本發明將顯示器所欲顯示的目標色域當作決定白色次畫素之亮度的因素之一，因此本發明之驅動方法可以在顧及色飽和度的前提下，充分地改善影像不連續的現象。 Since the present invention uses the target color gamut to be displayed by the display as one of the factors determining the brightness of the white sub-pixel, the driving method of the present invention can sufficiently improve the image discontinuity under the premise of color saturation. .
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，任何熟習此技藝者，在不脫離本發明之精神 和範圍內，當可作些許之更動與潤飾，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。 Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and those skilled in the art, without departing from the spirit of the invention And the scope of protection of the present invention is defined by the scope of the appended claims.
S100‧‧‧確定顯示器能夠顯示的最大色域 S100‧‧‧Determining the maximum color gamut that the display can display
S110‧‧‧顯示器所能夠顯示的最大色域內，選定一目標色域 S110‧‧‧Select a target color gamut in the maximum color gamut that the display can display
S120‧‧‧將紅-綠-藍影像資料轉換為一紅-綠-藍-白影像資料，以使顯示器能夠顯示目標色域 S120‧‧• Convert red-green-blue image data into a red-green-blue-white image data to enable the display to display the target color gamut
S130‧‧‧將紅-綠-藍-白影像資料輸入至顯示器，以驅動顯示器 S130‧‧‧ Input red-green-blue-white image data to the display to drive the display
S122‧‧‧當紅-綠-藍影像資料僅包括單一純色的資料時，根據紅-綠-藍影像資料以及目標色域，計算出白色次畫素的一最大亮度LWmax，並令白色次畫素顯示一預設亮度LWdefault，其中預設亮度LWdefault小於最大亮度LWmax S122‧‧‧ When the red-green-blue image data only includes the data of a single solid color, the maximum brightness LW max of the white sub-pixel is calculated according to the red-green-blue image data and the target color gamut, and the white sub-picture is drawn. Displaying a preset brightness LW default , wherein the preset brightness LW default is less than the maximum brightness LW max
S124‧‧‧當紅-綠-藍影像資料包括多種純色的資料時，根據目標色域以及不同的紅-綠-藍影像資料，計算出白色次畫素的一對應亮度，並令白色次畫素顯示對應亮度 S124‧‧‧ When the red-green-blue image data includes a variety of solid color data, a corresponding brightness of the white sub-pixel is calculated according to the target color gamut and different red-green-blue image data, and the white sub-pixel is obtained. Display corresponding brightness
圖1為本發明一實施例之顯示器之驅動方法的流程示意圖。 FIG. 1 is a schematic flow chart of a driving method of a display according to an embodiment of the present invention.
圖2為本發明另一實施例之顯示器之驅動方法的流程示意圖。 2 is a schematic flow chart of a driving method of a display according to another embodiment of the present invention.
S100‧‧‧確定顯示器能夠顯示的最大色域 S100‧‧‧Determining the maximum color gamut that the display can display
S110‧‧‧顯示器所能夠顯示的最大色域內，選定一目標色域 S110‧‧‧Select a target color gamut in the maximum color gamut that the display can display
S120‧‧‧將紅-綠-藍影像資料轉換為一紅-綠-藍-白影像資料，以使顯示器能夠顯示目標色域 S120‧‧• Convert red-green-blue image data into a red-green-blue-white image data to enable the display to display the target color gamut
S130‧‧‧將紅-綠-藍-白影像資料輸入至顯示器，以驅動顯示器 S130‧‧‧ Input red-green-blue-white image data to the display to drive the display
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|---|---|---|---|---|
| KR20040085678A (en) * | 2003-04-01 | 2004-10-08 | 삼성전자주식회사 | Four color liquid crystal display and driving method thereof |
| TW200723893A (en) * | 2005-07-29 | 2007-06-16 | Samsung Electronics Co Ltd | Video signal processor, display device, and method of driving the same |
| TWI289274B (en) * | 2003-10-21 | 2007-11-01 | Clairvoyante Inc | Method and apparatus for converting from a source color space to a target color space |
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|---|---|---|---|---|
| KR20040085678A (en) * | 2003-04-01 | 2004-10-08 | 삼성전자주식회사 | Four color liquid crystal display and driving method thereof |
| TWI289274B (en) * | 2003-10-21 | 2007-11-01 | Clairvoyante Inc | Method and apparatus for converting from a source color space to a target color space |
| TW200723893A (en) * | 2005-07-29 | 2007-06-16 | Samsung Electronics Co Ltd | Video signal processor, display device, and method of driving the same |
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