TWI420489B - Field sequential liquid crystal display and driving method thereof - Google Patents

場序式液晶顯示器及其驅動方法Field sequential liquid crystal display and driving method thereof

本發明係關於一種液晶顯示器，特別關於一種使用區域控制之場序式液晶顯示器及其驅動方法。The present invention relates to a liquid crystal display, and more particularly to a field sequential liquid crystal display using area control and a driving method thereof.

發光二極體(Light Emitting Diode,LED)具有反應快、易驅動及壽命長之優點，近年來已逐漸取代冷陰極管而成為液晶顯示器背光模組之光源。Light Emitting Diode (LED) has the advantages of fast response, easy driving and long life. In recent years, it has gradually replaced the cold cathode tube and become the light source of the liquid crystal display backlight module.

傳統液晶顯示器利用彩色濾光片以空間軸混色的方式顯示彩色畫面，然而彩色濾光片會吸收部份顏色的光而降低光之使用效率。因此，業界提出以發光二極體搭配色序法以時間軸混色的方式顯示彩色畫面，如第1圖所示；其中每一個畫面(frame)可進一步被區分為三種或三種以上單色之子畫面(sub-frame)，例如紅色(R)、綠色(G)及藍色(B)等，並於每一個子畫面期間利用相對顏色的發光二極體提供背光。當人眼的感知頻道於視覺暫留時間內依序感知所有子畫面的顏色後即可混成一特定色彩。The conventional liquid crystal display uses a color filter to display a color picture in a spatial axis color mixing manner. However, the color filter absorbs part of the color light to reduce the efficiency of light use. Therefore, the industry proposes to display a color picture in a time-axis color mixing manner by using a light-emitting diode with a color-sequence method, as shown in FIG. 1; each frame can be further divided into three or more kinds of monochrome sub-pictures. (sub-frame), such as red (R), green (G), and blue (B), etc., and provides backlighting with light-emitting diodes of opposite colors during each sub-picture. When the human eye's perception channel sequentially perceives the color of all the sub-pictures in the visual persistence time, it can be mixed into a specific color.

請參照第2圖所示，例如以一掃描頻率為60Hz的色序法顯示器而言，每一個顯示畫面的顯示時間約為16.7毫秒(ms)，因而每一個子畫面所分配到的時間僅約為5.6毫秒。在此5.6毫秒中，共包括了資料寫入時間t₁ 、液晶反應時間t₂ 及二極體發光時間t₃ ，若二極體發光時間t₃ 太短則會導致顯示亮度不足；雖可透過增加二極體的驅動電流以增加顯示亮度，然而此種方法會降低發光二極體的發光效率。Referring to FIG. 2, for example, in a color sequential display with a scanning frequency of 60 Hz, the display time of each display screen is about 16.7 milliseconds (ms), and thus the time allocated to each sub-picture is only about It is 5.6 milliseconds. In this 5.6 milliseconds, the data writing time t ₁ , the liquid crystal reaction time t ₂ and the diode light-emitting time t _{3 are included} . If the diode light-emitting time t _{3 is} too short, the display brightness is insufficient; The driving current of the diode is increased to increase the display brightness, but this method reduces the luminous efficiency of the light emitting diode.

為改善此一問題，習知可透過區域控制法以增加每一子畫面中之二極體發光時間t₃ 。請參照第3a~3b圖所示，第3a圖顯示一區域控制顯示面板之示意圖，第3b圖則顯示第3a圖之顯示面板之驅動時序之示意圖。該顯示面板被區分為一第一區域、一第二區域及一第三區域。第一區域至第三區域中，液晶動作及相對應之背光源係各自獨立地被操作與控制，如第3b圖所示。每一區域中，當資料寫入完成(資料寫入時間t₁ )以及液晶反應完畢(液晶反應時間t₂ )後即可點亮光源而不必等待其他區域完成資料寫入及液晶反應。藉此，每一子畫面中二極體的發光時間則可延長為t₃ ' ，因而不需增加發光二極體之驅動電流仍可提高顯示亮度。In order to improve this problem, it is known to increase the dipole illumination time t _{3 in} each sub-picture through the area control method. Referring to Figures 3a-3b, Figure 3a shows a schematic diagram of a zone control display panel, and Figure 3b shows a schematic diagram of the drive timing of the display panel of Figure 3a. The display panel is divided into a first area, a second area, and a third area. In the first to third regions, the liquid crystal action and the corresponding backlight are each independently operated and controlled, as shown in FIG. 3b. In each area, when the data is written (data writing time t ₁ ) and the liquid crystal reaction is completed (liquid crystal reaction time t ₂ ), the light source can be lit without waiting for other areas to complete data writing and liquid crystal reaction. Thereby, the light-emitting time of the diode in each sub-picture can be extended to t ₃ ' , so that the display brightness can be improved without increasing the driving current of the light-emitting diode.

在某些情形下，會於連續的顏色子畫面間插入黑資料以增加顯示畫面的亮度。例如第3c圖中，於紅色子畫面與綠色子畫面間加入一黑資料，其中黑資料期間之顯示資料為零灰階；當顯示資料從黑資料顯示期間轉換至下一顯示畫面時(在此以綠畫面為例)，由於不同區域之液晶轉換狀態不同，每一區域對相鄰區域之漏光將導致顯示畫面之顏色不均勻。例如於256灰階的顯示資料中，液晶從零灰階(L0)轉換至255灰階(L255)所需時間最長，因而上述顯示畫面之顏色不均勻在黑畫面(對應於L0)轉換至白畫面(對應於L255)時最為明顯。In some cases, black data is inserted between successive color sub-pictures to increase the brightness of the display. For example, in Figure 3c, a black data is added between the red sub-picture and the green sub-picture, wherein the display data during the black data period is zero gray scale; when the display data is switched from the black data display period to the next display screen (here) Taking the green screen as an example, since the liquid crystal transition states of different regions are different, light leakage of each region to adjacent regions will result in uneven color of the display image. For example, in the display data of 256 gray scales, the time required for the liquid crystal to change from zero gray scale (L0) to 255 gray scale (L255) is the longest, and thus the color of the above display screen is uneven, and the black screen (corresponding to L0) is converted to white. The most obvious when the picture (corresponding to L255).

例如第3c圖中，於綠資料顯示期間，當第一區域液晶反應完成後，第一區域的發光二極體則點亮，顯示出L255灰階之綠畫面。此時，第二區域及第三區域的液晶尚未反應到L255灰階，第一區域之發光二極體所發出的綠光少量會穿透到第二區域及第三區域；相對的，當第三區域的發光二極體點亮時，第一區域及第二區域的液晶已反應至L255灰階，所以由第三區域穿透至第一區域及第二區域的綠光較多。如此，於顯示畫面則會形成綠色亮度從第一區域、第二區域及第三區域依序遞減中導致顯示畫面顏色不均勻。For example, in the 3c figure, during the display of the green data, when the liquid crystal reaction of the first region is completed, the light-emitting diode of the first region is lit, and a green screen of L255 gray scale is displayed. At this time, the liquid crystals of the second region and the third region have not reacted to the L255 gray scale, and a small amount of green light emitted by the light-emitting diode of the first region penetrates into the second region and the third region; When the light-emitting diodes of the three regions are lit, the liquid crystals of the first region and the second region have reacted to the L255 gray scale, so that the green light penetrated from the third region to the first region and the second region is more. In this way, the green brightness is formed on the display screen, and the display area color unevenness is caused by sequentially decreasing from the first area, the second area, and the third area.

有鑑於此，有必要提出一種新的場序式液晶顯示器及其驅動方法以解決於不同顏色資料之間插入黑資料時所導致顯示畫面顏色不均勻的問題。In view of this, it is necessary to propose a new field sequential liquid crystal display and a driving method thereof to solve the problem that the color of the display screen is uneven when the black data is inserted between different color materials.

本發明提出一種場序式液晶顯示器及其驅動方法，其可使場序式液晶顯示器所顯示之畫面顏色更為均勻。The invention provides a field sequential liquid crystal display and a driving method thereof, which can make the picture color displayed by the field sequential liquid crystal display more uniform.

本發明提出一種場序式液晶顯示器之驅動方法，該場序式液晶顯示器包含複數顯示區域，該驅動方法包含下列步驟：於一第一期間依序提供一黑資料及一第一顏色之顯示資料至一第一區域；於該第一區域提供相應該第一顏色之顯示資料之一第一背光源；於晚於該第一期間之一第二期間依序提供該黑資料及該第一顏色之顯示資料至一第二區域；及於該第二區域提供相應該第一顏色之顯示資料之一第二背光源，其中該第二背光源之光強度高於該第一背光源之光強度。The invention provides a driving method of a field sequential liquid crystal display, wherein the field sequential liquid crystal display comprises a plurality of display areas, and the driving method comprises the steps of: sequentially providing a black data and a display material of a first color in a first period; Providing a first backlight to the first area; providing a first backlight corresponding to the display material of the first color; and sequentially providing the black data and the first color in a second period later than the first period Displaying the data to a second area; and providing a second backlight corresponding to the display material of the first color in the second area, wherein the light intensity of the second backlight is higher than the light intensity of the first backlight .

本發明另提出一種場序式液晶顯示器之驅動方法，該場序式液晶顯示器包含複數顯示區域，該驅動方法包含下列步驟：於一第一期間依序提供一黑資料及一第一顏色之顯示資料至一第一區域；於該第一區域提供相應該第一顏色之顯示資料之一第一背光源；於晚於該第一期間之一第二期間依序提供該黑資料及該第一顏色之顯示資料至一第二區域；及於該第二區域提供相應該第一顏色之顯示資料之一第二背光源，其中該第二背光源之發光時間長於該第一背光源之發光時間。The present invention further provides a driving method of a field sequential liquid crystal display, the field sequential liquid crystal display comprising a plurality of display areas, the driving method comprising the steps of: sequentially providing a black data and a display of a first color in a first period And the first area is provided; the first area is provided with a first backlight corresponding to the display material of the first color; and the black data and the first is sequentially provided after a second period of the first period Displaying the color data to a second area; and providing a second backlight corresponding to the display material of the first color in the second area, wherein the second backlight source has a longer illumination time than the first backlight source .

於本發明之場序式液晶顯示器之驅動方法中，另包含下列步驟：提供一第二顏色之顯示資料於該黑資料之前。In the driving method of the field sequential liquid crystal display of the present invention, the method further comprises the steps of: providing a display material of a second color before the black material.

於本發明之場序式液晶顯示器之驅動方法中，該第二背光源之光強度與該第一背光源之光強度以及該第二背光源之發光時間與該第一背光源之發光時間之差值由該第一顏色之顯示資料之灰階值決定。第一顏色之顯示資料之灰階值可為一灰階範圍的最大值，例如255灰階值；該黑資料為0灰階值。In the driving method of the field sequential liquid crystal display of the present invention, the light intensity of the second backlight and the light intensity of the first backlight and the light emitting time of the second backlight and the light emitting time of the first backlight The difference is determined by the grayscale value of the display material of the first color. The grayscale value of the display data of the first color may be a maximum value of a grayscale range, such as a 255 grayscale value; the black data is a zero grayscale value.

本發明另提出一種場序式液晶顯示器，包含一顯示面板、一源極驅動器及複數光源。該顯示面板包含複數顯示區域且該等顯示區域於一顯示畫面之不同期間顯示該顯示畫面之部分畫面。該源極驅動器依序輸入一黑資料及一第一顏色之顯示資料至每一顯示區域。該等光源中，每一光源根據該黑資料及該第一顏色之顯示資料分別提供相應之一背光源至一個顯示區域；其中，該光源相對輸入至該顯示畫面中較晚顯示之顯示區域之該第一顏色之顯示資料提供較高強度及/或較長時間之背光源。The invention further provides a field sequential liquid crystal display comprising a display panel, a source driver and a plurality of light sources. The display panel includes a plurality of display areas and the display areas display a partial screen of the display screen during different periods of a display screen. The source driver sequentially inputs a black data and a display material of a first color to each display area. Each of the light sources respectively provides a corresponding one of the backlights to a display area according to the black data and the display data of the first color; wherein the light source is relatively input to the display area displayed later in the display screen The display material of the first color provides a higher intensity and/or longer backlight.

本發明之場序式液晶顯示器之驅動方法適用於使用區域控制之場序式液晶顯示器，其較佳使用發光二極體作為背光模組之光源，但不限於此。The driving method of the field sequential liquid crystal display of the present invention is applicable to a field sequential liquid crystal display using a region control, and preferably uses a light emitting diode as a light source of the backlight module, but is not limited thereto.

本發明之場序式液晶顯示器之驅動方法適用於具有插黑資料之場序式液晶顯示器，可同時達成提高亮度及增加顯示畫面顏色均勻度之目的。The driving method of the field sequential liquid crystal display of the invention is suitable for the field sequential liquid crystal display with black insertion data, and can simultaneously achieve the purpose of improving brightness and increasing the color uniformity of the display picture.

為了讓本發明之上述和其他目的、特徵、和優點能更明顯，下文將配合所附圖示，作詳細說明如下。於本發明之說明中，相同之構件係以相同之符號表示，於此合先敘明。The above and other objects, features, and advantages of the present invention will become more apparent from the accompanying drawings. In the description of the present invention, the same components are denoted by the same reference numerals and will be described in the foregoing.

請參照第4a-4b圖所示，第4a圖顯示本發明第一實施例之場序式液晶顯示器之示意圖，第4b圖顯示第4a圖中各區域驅動時序之示意圖。本發明之場序式液晶顯示器1包含一顯示面板10、複數閘極驅動器111~113(在此以複數個閘極驅動器為例，亦可由單一個閘極驅動器控制複數個區域)、複數光源121~123及一源極驅動器13。可以了解的是，第4a圖僅顯示了用以說明本發明之部分構件並省略了其他構件。Referring to Figures 4a-4b, Figure 4a shows a schematic diagram of a field sequential liquid crystal display according to a first embodiment of the present invention, and Figure 4b shows a schematic diagram of driving timing of each region in Figure 4a. The field sequential liquid crystal display 1 of the present invention comprises a display panel 10 and a plurality of gate drivers 111-113 (here, a plurality of gate drivers are used as an example, and a plurality of gates can be controlled by a single gate driver), and the plurality of light sources 121 ~123 and a source driver 13. It will be appreciated that Figure 4a shows only some of the components used to illustrate the invention and other components are omitted.

該顯示面板10區分為複數顯示區域以供作區域控制，例如本實施例中該顯示面板10區分為第一區域101、第二區域102及第三區域103，但本發明並不限於此。每一區域受到各自的閘極驅動器驅動並由各自的背光光源提供背光，例如本實施例中該第一區域101受到該閘極驅動器111控制並以該光源121作為其背光源；該第二區域102受到該閘極驅動器112控制並以該光源122作為其背光源；該第三區域103受到該閘極驅動器113控制並以該光源123作為其背光源。可以了解的是，該等光源121~123的位置可位於該顯示面板10之下方或側面以形成不同型式之背光模組，例如直下式背光模組或側光式背光模組。此外，雖然該等光源121~123於第4a圖中顯示為發光二極體，但其並非用以限定本發明，該等光源121~123可為習知使用於背光模組之其他光源。The display panel 10 is divided into a plurality of display areas for area control. For example, the display panel 10 is divided into the first area 101, the second area 102, and the third area 103 in this embodiment, but the present invention is not limited thereto. Each of the regions is driven by a respective gate driver and provided with a backlight by a respective backlight source. For example, in the embodiment, the first region 101 is controlled by the gate driver 111 and the light source 121 is used as a backlight thereof; the second region 102 is controlled by the gate driver 112 and uses the light source 122 as its backlight; the third region 103 is controlled by the gate driver 113 and uses the light source 123 as its backlight. It can be understood that the positions of the light sources 121-123 can be located below or on the side of the display panel 10 to form different types of backlight modules, such as a direct-lit backlight module or an edge-lit backlight module. In addition, although the light sources 121-123 are shown as light-emitting diodes in FIG. 4a, they are not intended to limit the present invention, and the light sources 121-123 may be other light sources conventionally used in backlight modules.

請再參照第4a及4b圖所示，於一顯示畫面(frame)之一第一期間，該源極驅動器13依序輸入各顏色子畫面之顯示資料至該第一區域101，例如依序輸入一紅色(R)、一黑資料(BL)、一綠色(G)及一藍色(B)子畫面資料，但所述顏色子畫面並不限定於RGB三色；該閘極驅動器111配合各顏色子畫面之顯示資料開啟該第一區域101之各列畫素，該光源121相對於各顏色子畫面之顯示資料而提供相應顏色之光源。於該顯示畫面之一第二期間，其晚於該第一期間，該閘極驅動器112配合各顏色子畫面之顯示資料開啟該第二區域102之各列畫素，該光源122相對於各顏色子畫面之顯示資料而提供相應顏色之光源。於該顯示畫面之一第三期間，其又晚於該第二期間，該閘極驅動器113配合各顏色子畫面之顯示資料開啟該第三區域103之各列畫素，該光源123相對於各顏色子畫面之顯示資料而提供相應顏色之光源。於一顯示畫面期間，該第一區域至第三區域101~103分別顯示該顯示畫面之部份畫面。Referring to FIG. 4a and FIG. 4b again, in a first period of a display frame, the source driver 13 sequentially inputs the display data of each color sub-picture to the first area 101, for example, sequentially. a red (R), a black data (BL), a green (G) and a blue (B) sub-picture data, but the color sub-picture is not limited to RGB three colors; the gate driver 111 cooperates with each The display material of the color sub-picture opens each column of pixels of the first area 101, and the light source 121 provides a light source of a corresponding color with respect to the display material of each color sub-picture. In a second period of the display screen, later than the first period, the gate driver 112 turns on the columns of pixels of the second region 102 in conjunction with the display data of the color sub-pictures, the light source 122 is relative to each color. The display of the sub-picture provides the light source of the corresponding color. In a third period of the display screen, which is later than the second period, the gate driver 113 turns on the columns of the pixels of the third region 103 in cooperation with the display materials of the color sub-pictures, the light source 123 is opposite to each The color sub-picture displays the data and provides the light source of the corresponding color. During the display of the screen, the first to third regions 101 to 103 respectively display a part of the screen of the display screen.

第4b圖中，t₁ 表示每一區域中顯示資料之寫入時間，t₂ 表示液晶分子之反應時間，t₃ ' 及t₃₁ ~t₃₃ 表示各顏色子畫面中該等光源121~123相應之發光時間。亦即於每一顯示畫面期間，該源極驅動器13利用t₁ 期間更新每一顏色子畫面之顯示資料，經過t₂ 期間等待液晶反應完成後，該等光源121~123才會被點亮一t₃ ' 或t₃₁ ~t₃₃ 期間。In Fig. 4b, t ₁ represents the writing time of the displayed data in each area, t ₂ represents the reaction time of the liquid crystal molecules, and t ₃ ' and t ₃₁ ~ t ₃₃ represent the corresponding light sources 121 to 123 in the respective color sub-pictures. The time of illumination. That is, during each display screen, the source driver 13 updates the display material of each color sub-picture during the t ₁ period, and waits for the liquid crystal reaction to complete after the t ₂ period, the light sources 121 to 123 are illuminated. t ₃ ' or t ₃₁ ~ t ₃₃ period.

綜而言之，本發明之場序式液晶顯示器1中，該第一區域至第三區域101~103分別於不同期間顯示一顯示畫面之部份畫面；其中該第二區域102之顯示時間略晚於該第一區域101，該第三區域103之顯示時間略晚於該第二區域102，但本發明並不限於此，例如其顯示時間順序可相反。當該顯示面板10顯示一顯示畫面時，該源極驅動器13依序提供不同顏色子畫面之顯示資料至各區域，閘極驅動器依序開啟各列畫素，且該等光源121~123分別根據提供至各區域之顯示資料而依序於不同顏色子畫面期間提供相應顏色之背光源，例如RGB或黃色(Y)洋紅色(M)青色(C)等三原色的背光源。根據光學補償彎曲型(OCB)液晶的特性，通常會於一顏色子畫面之後插入一黑資料(black)以增加顯示亮度，例如第4b圖顯示於紅色子畫面之後插入黑資料。第4b圖中，當顯示面板10顯示綠色子畫面之顯示資料時，該第二區域102及第三區域103之綠色光成份會較低而出現顯示畫面顏色不均勻之情形，尤其當該顯示畫面為一白畫面或單色(綠色)畫面時最為明顯。可以了解的是，黑資料亦可能插入至其他顏色子畫面之後。In summary, in the field sequential liquid crystal display 1 of the present invention, the first to third regions 101 to 103 respectively display a partial screen of a display screen during different periods; wherein the display time of the second region 102 is slightly Later than the first area 101, the display time of the third area 103 is slightly later than the second area 102, but the invention is not limited thereto, for example, the display time sequence may be reversed. When the display panel 10 displays a display screen, the source driver 13 sequentially provides display data of different color sub-pictures to each area, and the gate driver sequentially turns on each column of pixels, and the light sources 121-123 are respectively according to A display source for each area is provided to provide a backlight of a corresponding color during a different color sub-picture, such as a backlight of three primary colors such as RGB or yellow (Y) magenta (M) cyan (C). According to the characteristics of the optically compensated curved (OCB) liquid crystal, a black data (black) is usually inserted after a color sub-picture to increase the display brightness. For example, the 4th picture shows the black data inserted after the red sub-picture. In FIG. 4b, when the display panel 10 displays the display material of the green sub-picture, the green light components of the second area 102 and the third area 103 may be lower, and the display picture color is uneven, especially when the display screen is displayed. It is most noticeable when it is a white screen or a monochrome (green) screen. It can be understood that black data may also be inserted after other color sub-pictures.

因此，本發明透過增加黑資料後部份顯示區域之子畫面的發光時間，並使該顯示畫面中愈晚顯示之顯示區域之光源的發光時間愈長，藉以消除顯示畫面不均勻之問題。例如於本實施例中，該第二區域102之顯示時間晚於該第一區域101；該第三區域103之顯示時間又晚於該第二區域102。因此，該第二區域102中綠色子畫面之發光時間t₃₂ 設定為長於該第一區域101中綠色子畫面之發光時間t₃₁ ；該第三區域103中綠色子畫面之發光時間t₃₃ 又設定為長於該第二區域102中綠色子畫面之發光時間t₃₂ ，亦即t₃₃ >t₃₂ >t₃₁ 。此外，該等發光時間彼此間之差值，亦即t₃₂ -t₃₁ 或t₃₃ -t₃₂ ，可由該黑資料後之顏色子畫面之灰階值所決定。於白畫面或單色畫面(例如；紅、綠或藍畫面)中，該黑資料後之顏色子畫面可能為一畫素範圍(例如256灰階)之最大灰階值，此時上述發光時間彼此間之差值可設定為最大。Therefore, the present invention eliminates the problem of unevenness of the display screen by increasing the illumination time of the sub-pictures of the partial display area after the black data and increasing the illumination time of the light source of the display area displayed later in the display screen. For example, in this embodiment, the display time of the second area 102 is later than the first area 101; the display time of the third area 103 is later than the second area 102. Therefore, the lighting time t ₃₂ of the green sub-picture in the second area 102 is set to be longer than the lighting time t ₃₁ of the green sub-picture in the first area 101; the lighting time t ₃₃ of the green sub-picture in the third area 103 is set again. It is longer than the illumination time t ₃₂ of the green sub-picture in the second area 102, that is, t ₃₃ > t ₃₂ > t ₃₁ . In addition, the difference between the illuminating times, that is, t ₃₂ -t ₃₁ or t ₃₃ -t ₃₂ , can be determined by the gray scale value of the color sub-picture after the black data. In a white screen or a monochrome screen (for example, a red, green or blue screen), the color sub-picture after the black data may be the maximum gray level value of a pixel range (for example, 256 gray scale), and the above-mentioned lighting time The difference between each other can be set to the maximum.

請參照第6a圖所示，因此本發明一實施例之場序式液晶顯示器之驅動方法包含下列步驟：於一第一期間依序提供一黑資料及一第一顏色之顯示資料至一第一區域(步驟S₁ )；於該第一區域提供相應該第一顏色之顯示資料之一第一背光源(步驟S₂ )；於晚於該第一期間之一第二期間依序提供該黑資料及該第一顏色之顯示資料至一第二區域(步驟S₃ )；及於該第二區域提供相應該第一顏色之顯示資料之一第二背光源，其中該第二背光源之光強度高於該第一背光源之光強度(步驟S₄ )。此外，根據本發明之場序式液晶顯示器之驅動方法，另包含下列步驟：提供一第二顏色之顯示資料於該黑資料之前。Please refer to FIG. 6a. Therefore, the driving method of the field sequential liquid crystal display according to an embodiment of the present invention includes the following steps: sequentially providing a black data and a display material of a first color to a first in a first period. a region (step S ₁ ); providing a first backlight corresponding to the display material of the first color in the first region (step S ₂ ); and sequentially providing the black in a second period later than the first period data and display data of the first color to a second region (step S _3); and a second backlight should be provided with one of a first display data on the color of the second region, wherein the second light source of the backlight a first intensity higher than the light intensity of the backlight (step S _4). Further, the driving method of the field sequential liquid crystal display according to the present invention further comprises the step of providing a display material of a second color before the black material.

請參照第5圖所示，其顯示本發明第二實施例之場序式液晶顯示器之示意圖，其中第5圖之場序式液晶顯示器1' 中各顯示區域之驅動時序圖可參照第3c圖所示。本實施例與前述第一實施例之差異在於，第二實施例係透過增加黑資料後部份顯示區域之子畫面的發光強度，並使一顯示畫面中愈晚顯示之顯示區域之光源的發光強度愈強，藉以消除顯示畫面不均勻之問題。Please refer to FIG. 5, which shows a schematic diagram of a field sequential liquid crystal display according to a second embodiment of the present invention. The driving sequence diagram of each display area in the field sequential liquid crystal display 1 ' of FIG. 5 can refer to FIG. 3c. Shown. The difference between this embodiment and the foregoing first embodiment is that the second embodiment transmits the illumination intensity of the sub-picture of the partial display area after the black data is added, and makes the illumination intensity of the light source of the display area displayed later in the display screen. The stronger, the problem of uneven display.

例如於第二實施例中，該第二區域102之顯示時間晚於該第一區域101；該第三區域103之顯示時間又晚於該第二區域102。因此，該第二區域102中綠色子畫面之光強度I₂ 設定為高於該第一區域101中綠色子畫面之光強度I₁ ；該第三區域103中綠色子畫面之光強度I₃ 又設定為高於該第二區域102中綠色子畫面之光強度I₂ ，亦即I₃ >I₂ >I₁ 。例如，當該等光源121~123為發光二極體時，可透過改變輸入至發光二極體之電流及/或改變每一顯示區域中點亮之發光二極體的數目以改變每一顯示區域之光強度；若所需之光強度愈強，則可點亮一顯示區域中較多數目的發光二極體。此外，該等光強度彼此間之差值，亦即I₂ -I₁ 或I₃ -I₂ ，係由該黑資料後之顏色子畫面之灰階值所決定。於白畫面或單色畫面(例如；紅、綠或藍畫面)中，該黑資料後之顏色子畫面可能具有一畫素範圍之最大灰階值(例如255灰階)，此時光強度彼此間之差值可設定為最大。For example, in the second embodiment, the display time of the second area 102 is later than the first area 101; the display time of the third area 103 is later than the second area 102. Therefore, the light intensity I ₂ of the green sub-picture in the second area 102 is set higher than the light intensity I ₁ of the green sub-picture in the first area 101; the light intensity I ₃ of the green sub-picture in the third area 103 is again It is set to be higher than the light intensity I ₂ of the green sub-picture in the second area 102, that is, I ₃ >I ₂ >I ₁ . For example, when the light sources 121-123 are light-emitting diodes, each display can be changed by changing the current input to the light-emitting diodes and/or changing the number of light-emitting diodes lit in each display area. The intensity of the light in the area; if the required light intensity is stronger, a larger number of light-emitting diodes in a display area can be illuminated. Furthermore, the difference between the light intensities, i.e., I ₂ -I ₁ or I ₃ -I ₂ , is determined by the grayscale value of the color sub-picture after the black data. In a white screen or a monochrome screen (for example, a red, green or blue screen), the color sub-picture after the black data may have a maximum gray scale value of a pixel range (for example, 255 gray scale), at which time the light intensities are between each other. The difference can be set to the maximum.

請參照第6b圖所示，因此本發明另一實施例之場序式液晶顯示器之驅動方法包含下列步驟：於一第一期間依序提供一黑資料及一第一顏色之顯示資料至一第一區域(步驟S₁ )；於該第一區域提供相應該第一顏色之顯示資料之一第一背光源(步驟S₂ )；於晚於該第一期間之一第二期間依序提供該該黑資料及該第一顏色之顯示資料至一第二區域(步驟S₃ )；及於該第二區域提供相應該第一顏色之顯示資料之一第二背光源，其中該第二背光源之發光時間長於該第一背光源之發光時間(步驟S₅ )。此外，根據本發明之場序式液晶顯示器之驅動方法，另包含下列步驟：提供一第二顏色之顯示資料於該黑資料之前。Referring to FIG. 6b, the driving method of the field sequential liquid crystal display according to another embodiment of the present invention includes the following steps: sequentially providing a black data and a display data of a first color to a first period in a first period. An area (step S ₁ ); providing a first backlight corresponding to the display material of the first color in the first area (step S ₂ ); and sequentially providing the second period later than the second period of the first period the display data and black data of the first color to a second region (step S _3); and a second backlight should be provided with one of a first display data on the color of the second region, wherein the second backlight the light emission time is longer than the first light emission time of the backlight (step S _5). Further, the driving method of the field sequential liquid crystal display according to the present invention further comprises the step of providing a display material of a second color before the black material.

可以了解的是，上述第一實施例及第二實施例可同時實施，亦即黑資料後部份區域(例如第4a及5圖之第二區域102及第三區域103)之顏色子畫面的發光時間及光強度可同時設定為不同，並使一顯示畫面中愈晚顯示之顯示區域之光源的發光時間愈長且光強度愈強，藉以消除顯示畫面不均勻之問題。It can be understood that the above-mentioned first embodiment and the second embodiment can be simultaneously implemented, that is, the color sub-picture of the partial area after the black data (for example, the second area 102 and the third area 103 of FIGS. 4a and 5). The illuminating time and the light intensity can be set to be different at the same time, and the longer the illuminating time of the light source of the display area displayed later in a display screen and the stronger the light intensity, thereby eliminating the problem of uneven display.

如前所述，由於習知場序式液晶顯示器之不同控制區域間會互相漏光而導致所顯示畫面之顏色不均勻。本發明提出一種場序式液晶顯示器及其驅動方法(第4a至6圖)，透過改變不同控制區域中黑資料後之顏色子畫面相對應光源之發光時間或發光強度，以解決顯示畫面顏色不均勻之問題。As described above, the color of the displayed picture is uneven due to light leakage between different control areas of the conventional field sequential liquid crystal display. The invention provides a field sequential liquid crystal display and a driving method thereof (Fig. 4a to Fig. 6), which can solve the color of the display screen by changing the light emitting time or the luminous intensity of the corresponding color source of the color sub-picture after the black data in different control areas. Uniform problem.

雖然本發明已以前述實施例揭示，然其並非用以限定本發明，任何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修改。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。The present invention has been disclosed in the foregoing embodiments, and is not intended to limit the present invention. Any of the ordinary skill in the art to which the invention pertains can be modified and modified 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.

1、1' ．．．場序式液晶顯示器1, 1 ' . . . Field sequential liquid crystal display

10．．．顯示面板10. . . Display panel

101．．．第一區域101. . . First area

102．．．第二區域102. . . Second area

103．．．第三區域103. . . Third area

111~113．．．閘極驅動器111~113. . . Gate driver

121~122．．．光源121~122. . . light source

13．．．源極驅動器13. . . Source driver

t₁ ．．．資料寫入時間t ₁ . . . Data write time

t₂ ．．．液晶反應時間t ₂ . . . Liquid crystal reaction time

t₃₁ ~t₃₃ 、t₃ 、t₃ ' ．．．光源發光時間t ₃₁ ~ t ₃₃ , t ₃ , t ₃ ' . . . Light source illumination time

I₁ ~I₃ ．．．光強度I ₁ ~I ₃ . . . brightness

第1圖顯示色序法色彩顯示技術之示意圖。Figure 1 shows a schematic diagram of the color sequential color display technique.

第2圖顯示色序法色彩顯示技術中一顯示畫面區分為數個子畫面之示意圖。FIG. 2 is a schematic diagram showing a display screen divided into a plurality of sub-pictures in the color sequential color display technology.

第3a圖顯示區域控制場序式液晶顯示器之示意圖。Figure 3a shows a schematic diagram of an area controlled field sequential liquid crystal display.

第3b圖顯示第3a圖之區域控制場序式液晶顯示器中各區域驅動時序之示意圖。Fig. 3b is a diagram showing the driving timing of each region in the area control field sequential liquid crystal display of Fig. 3a.

第3c圖顯示顯示第3a圖之區域控制場序式液晶顯示器中各區域驅動時序之另一示意圖。Figure 3c shows another schematic diagram showing the driving sequence of each region in the area controlled field sequential liquid crystal display of Figure 3a.

第4a圖顯示本發明第一實施例之場序式液晶顯示器之示意圖。Fig. 4a is a view showing the field sequential liquid crystal display of the first embodiment of the present invention.

第4b圖顯示第4a圖之場序式顯示器中各區域驅動時序之示意圖。Figure 4b shows a schematic diagram of the drive timing of each region in the field sequential display of Figure 4a.

第5圖顯示本發明第二實施例之場序式液晶顯示器之示意圖。Fig. 5 is a view showing the field sequential liquid crystal display of the second embodiment of the present invention.

第6a-6b圖顯示本發明實施例之場序式液晶顯示器之驅動方法之流程圖。6a-6b are flow charts showing a driving method of the field sequential liquid crystal display of the embodiment of the present invention.

S₁ ~S₄ ．．．步驟S ₁ ~S ₄ . . . step