TWI444977B - Lcd sequential color display device and driving method - Google Patents

場序式液晶顯示裝置及其驅動方法Field sequential liquid crystal display device and driving method thereof

本發明是關於一種場序彩色顯示之反應架構及其方法，特別是一種在液晶顯示過程中當每一顯示資料序列輸入時，背光模組已經開始發光點亮原色並在該原色結束顯示前驅動液晶顯示上所有畫素至一特定灰階以達場序彩色顯示之反應。The invention relates to a reaction structure and a method for field sequential color display, in particular, when a display data sequence is input during a liquid crystal display process, the backlight module has started to illuminate and illuminate the primary color and drive before the primary color ends display. All pixels on the liquid crystal display to a specific gray scale to achieve the response of the field sequential color display.

隨著平面顯示器產業蓬勃發展，顯示技術日新又新，平面顯示裝置液晶顯示器(Liquid Ctystal Display，LCD)以量產規模而論，穩居平面顯示器之冠。為保持LCD顯示技術現有的競爭優勢，目前已投入大量研發資源及人力在提昇傳統LCD之效能與顯示品質。傳統使用空間彩色濾光片(Spatial Color Filter，SCF)技術之液晶顯示器中，單一畫素由三個子畫素所構成，每個子畫素由一顆場效電晶體(Field Effect Transistor，TFT)控制該子畫素的電場強度，以決定通過該子畫素的光強度；通過各子畫素之光能量，再經由各子畫素所對應之彩色(紅色、綠色及藍色)濾光片調變，以得到各子畫素所需之各原色光強度，最後再依靠視覺系統的作用，將各子畫素之原色混合成該畫素所欲表現之原色。因傳統液晶顯示器必須使用白色背光模組，如冷陰極螢光燈管(Cold Cathode Fluorescent Lamp，CCFL)或是LED光源。相對地，採用場序式全彩(Field－Sequential Full－Color，FS－FC)技術之液晶顯示器則移除彩色濾光片，且各畫素不需再分割出子畫素，其色彩形成，必須依靠背光模組中，三種原色之光源依時序切換，搭配在各色光源顯示時間內，同步控制之液晶畫素穿透率，以調配各原色之相對光量，再由視覺系統對光刺激的積分作用，以形成並察知該顏色。With the booming development of the flat panel display industry, display technology is becoming new and new. The liquid crystal display (LCD) of the flat panel display device is the highest in flat panel display in terms of mass production scale. In order to maintain the existing competitive advantages of LCD display technology, a large amount of research and development resources and manpower have been invested in improving the performance and display quality of traditional LCDs. In a conventional liquid crystal display using Spatial Color Filter (SCF) technology, a single pixel is composed of three sub-pixels, and each sub-pixel is controlled by a Field Effect Transistor (TFT). The electric field intensity of the sub-pixel determines the light intensity passing through the sub-pixel; the light energy of each sub-pixel is passed through the color (red, green, and blue) filters corresponding to each sub-pixel Change to obtain the light intensity of each primary color required for each sub-pixel, and finally rely on the function of the visual system to mix the primary colors of each sub-pixel into the primary color that the pixel wants to express. Because traditional LCDs must use white backlight modules, such as Cold Cathode Fluorescent Lamps (CCFLs) or LED light sources. In contrast, a liquid crystal display using Field-Sequential Full-Color (FS-FC) technology removes a color filter, and each pixel does not need to be further divided into sub-pixels, and its color is formed. It is necessary to rely on the backlight module to switch the light sources of the three primary colors according to the timing, and to match the liquid crystal pixel penetration rate of each color light source to adjust the relative light quantity of each primary color, and then integrate the light stimulation by the visual system. Act to form and detect the color.

此種場序式全彩技術之液晶顯示器相較於傳統採用SCF技術之液晶顯示器，具有多項優點：不需要用彩色濾光片，在製程上除節省原料成本外，實質地省略濾光片塗佈、製作之工序、減少工時及提昇良率；連帶減少單一畫素中所需之TFT個數，簡化控制電路之複雜度，增加畫素開口率，有利於提高面板畫素的空間解析度。無彩色濾光片之LCD在顯示效能上的最大增益，則在於大幅提昇光利用效率，理論上可提昇至傳統LCD的三倍，因為平均有三分之二以上的光能量被彩色濾光片所吸收。此外，若妥善選擇適當光源，則可進一步增進系統的顯示品質。例如使用LED作為光源，因LED具有較其他燈源，例如CCFL，較窄的半高寬之頻譜特性，可呈現出高色彩飽和度之顏色，即可有效擴大系統色域(Color Gamut)，意即可呈現更豐富、多樣的色彩。Compared with the conventional liquid crystal display using SCF technology, the liquid crystal display of the field sequential full color technology has many advantages: no color filter is needed, and the filter is coated in the process, in addition to saving the raw material cost, the filter is substantially omitted. Cloth, manufacturing process, reducing working hours and improving yield; reducing the number of TFTs required in a single pixel, simplifying the complexity of the control circuit, increasing the aperture ratio of the pixel, and improving the spatial resolution of the panel pixel . The maximum gain of the LCD of the colorless filter is to greatly improve the light utilization efficiency, which can theoretically be increased to three times that of the conventional LCD, because an average of more than two-thirds of the light energy is colored by the color filter. Absorbed. In addition, if the appropriate light source is properly selected, the display quality of the system can be further improved. For example, LEDs are used as light sources. Because LEDs have spectral characteristics of narrower half-height widths than other light sources, such as CCFLs, they can exhibit high color saturation colors, which can effectively expand the system color gamut (Color Gamut). You can present richer and more diverse colors.

然而，目前場序式全彩的技術，因為液晶的反應時間普遍偏慢，在應用上受到嚴重的限制。第1圖為目前場序式全彩(Field－Sequential Color，FSC)之反應方式，此方式的缺點為背光模組(Back Light Unit，BLU)發光時間會受到IC資料寫入與液晶反應時間的壓縮，造成背光模組發光時間過小，因此不容易實現。此外，灰階到灰階的反應時間於某些灰階切換時會比較長，使得無法於所定時間內切換至正確灰階，造成影像顯示錯誤。為了解決上述之問題，本發明提出一種新穎的場序式液晶顯示裝置之驅動方法，不但容易實現，更可以改善因為液晶反應時間而受到壓縮的背光模組發光時間，同時也能改善灰階到灰階切換因液晶反應時間所衍生的問題。此外，相較於目前場序式驅動方法，本發明能提供背光模組有更高的亮度，因此可以降低LED功率消耗或減少LED的使用數量。However, the current field-sequence full-color technology, because the reaction time of liquid crystals is generally slow, is severely limited in application. The first picture shows the current field-sequential color (FSC) reaction mode. The disadvantage of this mode is that the backlight time (BLU) illumination time will be affected by the IC data writing and liquid crystal reaction time. Compression causes the backlight module to emit too little time, so it is not easy to implement. In addition, the reaction time of gray scale to gray scale is longer when switching to some gray scales, so that it is impossible to switch to the correct gray scale within the specified time, resulting in image display error. In order to solve the above problems, the present invention provides a novel driving method of a field sequential liquid crystal display device, which is not only easy to implement, but also can improve the illumination time of the backlight module which is compressed due to the reaction time of the liquid crystal, and can also improve the gray scale to Gray scale switching is a problem caused by liquid crystal reaction time. In addition, the present invention can provide a higher brightness of the backlight module than the current field sequential driving method, thereby reducing LED power consumption or reducing the number of LEDs used.

本發明之主要目的是在提供一種場序彩色顯示之反應架構及其方法，其系是一種在液晶顯示過程中，當每一顯示資料序列輸入時，背光模組已經開始發光點亮原色並在每一原色結束顯示前，起始一電壓驅動液晶顯示上所有畫素至一特定灰階直到該原色顯示結束以達成場序彩色顯示的反應。The main object of the present invention is to provide a field sequential color display reaction architecture and method thereof, which is a liquid crystal display process, when each display data sequence is input, the backlight module has begun to illuminate and illuminate the primary color and Before each primary color ends display, a voltage is initiated to drive all of the pixels on the liquid crystal display to a particular gray level until the primary color display ends to achieve a field sequential color display response.

本發明之架構至少包含一背光模組，根據場序彩色顯示之訊號依序發光點亮不同原色以及至少一控制IC，負責控制顯示資料序列輸入時間使該顯示資料序列輸入時，該背光模組已經發光點亮該原色，並在該原色結束顯示前，起始一電壓驅動液晶顯示上所有畫素至一特定灰階直到該原色顯示結束。其中所顯示的原色至少包含紅綠藍並且會依序輪流轉換，而且資料寫入所使用的時間跟驅動特定灰階所使用的時間是一致的。此外透過此方法，背光模組在顯示過程中就可以省略液晶反應時間。The architecture of the present invention comprises at least one backlight module, which sequentially illuminates different primary colors according to the field sequential color display signal and at least one control IC, and is responsible for controlling the input time of the display data sequence to input the display data sequence, the backlight module The primary color has been illuminated to illuminate, and before the primary color ends the display, a voltage is initiated to drive all of the pixels on the liquid crystal display to a particular gray level until the primary color display ends. The primary colors displayed include at least red, green, and blue, and are rotated in turn, and the time used for data writing is consistent with the time used to drive a particular grayscale. In addition, through this method, the backlight module can omit the liquid crystal reaction time during the display process.

底下藉由具體實施例配合所附的圖式詳加說明，當更容易瞭解本發明之目的、技術內容、特點及其所達成之功效。The purpose, technical contents, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments and the accompanying drawings.

本發明是關於一種場序彩色顯示之反應架構及其方法，特別是一種在含有複數個畫素與一背光模組的液晶裝置顯示過程中，背光模組至少包含一第一、一第二以及一第三原色光源，並於一第一原色次圖框中，持續點亮該第一原色光源，將複數資料訊號傳送至該複數個畫素；在該第一原色次圖框結束前，驅動該複數個畫素至一特定灰階以及於一第二原色次圖框與一第三原色次圖框中分別打開該第二原色光源與該第三原色光源，並重複上述步驟以驅動該液晶顯示裝置。換言之，當每一顯示資料序列輸入的同時，背光模組同步發光點亮原色並在每一原色結束顯示前，驅動該液晶顯示裝置上所有畫素至一特定灰階。The invention relates to a reaction structure and a method for field sequential color display, in particular, in a display process of a liquid crystal device comprising a plurality of pixels and a backlight module, the backlight module comprises at least a first, a second and a a third primary color light source, and in a first primary color sub-frame, continuously lighting the first primary color light source, transmitting the plurality of data signals to the plurality of pixels; before the end of the first primary color sub-frame, driving the The plurality of pixels to a specific gray level and the second primary color source and the third primary color source are respectively opened in a second primary color sub-frame and a third primary color sub-frame, and the above steps are repeated to drive the liquid crystal display device. In other words, while each display data sequence is input, the backlight module synchronously illuminates the primary colors and drives all the pixels on the liquid crystal display device to a specific gray level before each primary color finishes displaying.

本發明主要的反應方式如第2圖所示，針對每一原色，背光模組於一圖框中，根據不同原色分為三個次圖框(sub-frame)，於此三個次圖框中分別循序點亮紅色、綠色與藍色光源，並且於三個次圖框中分別施加代表紅色(R)、綠色(G)與藍色(B)之灰階至液晶顯示面板。藉由起始一個電壓來驅動液晶顯示裝置上所有畫素至一特定灰階6讓所有液晶均可由同一狀態開始啟動。由於每一顯示資料序列4輸入之顯示時間都為相同，當第n個顯示資料序列4輸入時，背光模組已經發光並點亮原色，此顯示資料序列於次圖框2之有效顯示時間是從顯示資料序列4輸入到起始特定灰階6輸入為止，也就是圖中的t0到t1。當顯示資料序列4輸入的時間與起始特定灰階輸入的時間為相同時，則所有顯示資料之有效顯示時間是相同的。透過此方法可讓背光模組在發光過程中省略液晶反應時間(LC Response Time)。The main reaction mode of the present invention is as shown in FIG. 2. For each primary color, the backlight module is divided into three sub-frames according to different primary colors for each primary color, and the three sub-frames. The red, green, and blue light sources are sequentially illuminated, and gray scales representing red (R), green (G), and blue (B) are applied to the liquid crystal display panel in the three sub-frames. By driving a voltage to drive all the pixels on the liquid crystal display device to a specific gray level 6, all liquid crystals can be started from the same state. Since the display time of each input data sequence 4 input is the same, when the nth display data sequence 4 is input, the backlight module has been illuminated and the primary color is illuminated, and the effective display time of the display data sequence in the second frame 2 is From the display data sequence 4 input to the start of the specific grayscale 6 input, that is, t0 to t1 in the figure. When the time when the display data sequence 4 is input is the same as the time at which the specific gray scale input is started, the effective display time of all the displayed data is the same. Through this method, the backlight module can omit the LC Response Time during the illumination process.

利用本發明所反應的液晶發光亮度可由第3圖來表示，利用人眼對光強度是一積分的方式來顯示光強度，因此人眼感受到之亮度為顯示資料輸入至起始輸入間光之積分強度，利用不同資料輸入會有不同之光積分強度，即可將各灰階定義出來。藉由此反應方式可以改善背光模組之有效發光時間以增加亮度，因此可以降低LED功率消耗或是減少LED的使用數量，且其不受液晶反應時間與顯示資料輸入時間所限制。另外利用顯示資料與起始覆蓋寫入之方式更可以加高此反應之圖框更新頻率(Frame Rate)。The brightness of the liquid crystal light emitted by the present invention can be expressed by the third figure, and the light intensity is displayed by the human eye as an integral of the light intensity, so that the brightness perceived by the human eye is the input of the display data to the initial input light. The integral intensity can be defined by using different data inputs with different light integral intensities. By this reaction method, the effective illumination time of the backlight module can be improved to increase the brightness, thereby reducing the LED power consumption or reducing the number of LEDs used, and it is not limited by the liquid crystal reaction time and the display data input time. In addition, the frame rate of the response can be increased by using the display data and the initial overlay writing method.

為了達到上述方法，本發明之種場序彩色顯示之反應架構至少需要一背光模組根據場序彩色顯示之訊號依序發光點亮不同原色以及至少一控制IC負責控制顯示資料序列的輸入時間以及特定灰階的顯示時間。如第4圖所示，假如顯示資料輸入與初始特定灰階輸入在時間上沒有重疊的話，可以單純只用一個控制IC來控制顯示資料與初始的訊號。但如果顯示資料輸入與初始特定灰階輸入在時間上有重疊如第5圖所示，顯示資料訊號以及初始特定灰階訊號就需要兩個控制IC來分別控管。本發明可以同時用在不同的次圖框，根據背光模組每一條顯示線能同時有不同的做動。In order to achieve the above method, the response architecture of the field sequential color display of the present invention requires at least one backlight module to sequentially illuminate different primary colors according to the field sequential color display signals, and at least one control IC is responsible for controlling the input time of the display data sequence and The display time of a particular grayscale. As shown in Fig. 4, if the display data input does not overlap with the initial specific grayscale input in time, only one control IC can be used to control the display data and the initial signal. However, if the display data input overlaps with the initial specific grayscale input in time as shown in Fig. 5, the display data signal and the initial specific grayscale signal require two control ICs to be separately controlled. The invention can be used in different sub-frames at the same time, and each display line of the backlight module can have different actions at the same time.

若將本發明套用在液晶顯示器使其具有場序彩色顯示反應功能，只需將本發明之場序彩色顯示反應裝置與液晶顯示面板做搭配即可，而該液晶顯示面板的畫素結構是不同於以往的液晶顯示面板。第六圖為本發明中液晶顯示面板的畫素結構圖，當顯示資料輸入與初始特定灰階輸入在時間上有重疊如第5圖時，為了能夠控制初始時間，如第6圖所示，每個畫素結構裡面相較於習知技術會多添加一條初始線(initial)以及初始掃瞄線(Initial Scan,Si)用於反應初始特定灰階的功能，並同時多了一個閘極讓初始線以及初始掃瞄線可以通過儲存電容(Cst)以及液晶電容(Clc)。其他的結構則與習知的畫素結構相似包含資料線以及資料掃瞄線。若顯示資料輸入與初始特定灰階輸入在時間上無重疊問題，則畫素結構與習知技術是可以相同的，而初始電壓可以由資料線提供。第7圖為本發明運用在液晶顯示器上之整體結構實施例之一，其中該結構中的每一畫素架構則和上述第6圖一樣。第8圖為第7圖液晶顯示面板的畫素結構時間，例如在一個含有480個畫素的7吋面版中，資料掃瞄線1(Sd1)到資料掃瞄線480(Sd480)的反應時間會順序的從Sd1跳到Sd480。相對初始掃瞄線(Si)也會從第一條Si1跳到Si480，而初始掃瞄線的反應時間順序也會比照資料掃瞄線的順序，例如Sd1與Si1間的時間間隔與Sd2及Si2間相同，並以此類推。資料的寫入也會跟反應時間同時執行，而初始線則從頭反應到結束為止。因此若是一個含有場序彩色顯示之液晶顯示器最少需要一本發明專用液晶顯示面板用於顯示輸出畫面以及一場序彩色顯示反應裝置用於反應該顯示面版使其擁有場序彩色顯示。該場序彩色顯示反應裝置則如先前所提過的，包含一背光模組以及至少一控制IC。If the present invention is applied to a liquid crystal display to have a field sequential color display reaction function, it is only necessary to match the field sequential color display reaction device of the present invention with a liquid crystal display panel, and the pixel structure of the liquid crystal display panel is different. In the past liquid crystal display panels. The sixth figure is a pixel structure diagram of the liquid crystal display panel of the present invention. When the display data input overlaps with the initial specific gray scale input in time, as shown in FIG. 5, in order to control the initial time, as shown in FIG. In each pixel structure, an initial line and an initial scan line (Initial Scan, Si) are added to reflect the initial specific gray level function, and at the same time, a gate is added. The initial line and the initial scan line can pass through the storage capacitor (Cst) and the liquid crystal capacitor (Clc). Other structures are similar to the well-known pixel structure, including data lines and data scan lines. If the display data input does not overlap with the initial specific gray scale input in time, the pixel structure and the conventional technique can be the same, and the initial voltage can be provided by the data line. Figure 7 is a diagram showing an embodiment of the overall structure of the present invention applied to a liquid crystal display, wherein each pixel structure in the structure is the same as that of Figure 6 above. Figure 8 is the pixel structure time of the liquid crystal display panel of Figure 7, for example, in a 7-inch plate containing 480 pixels, the response of the data scan line 1 (Sd1) to the data scan line 480 (Sd480) The time will jump from Sd1 to Sd480 in sequence. The relative initial scan line (Si) will also jump from the first Si1 to Si480, and the reaction time sequence of the initial scan line will also be in the order of the data scan line, such as the time interval between Sd1 and Si1 and Sd2 and Si2. The same, and so on. The writing of the data is also performed at the same time as the reaction time, and the initial line is reflected from the beginning to the end. Therefore, if a liquid crystal display having a field sequential color display requires at least one invention-specific liquid crystal display panel for displaying an output screen and a sequential color display reaction device for reacting the display panel to have a field sequential color display. The field sequential color display reaction device, as previously mentioned, includes a backlight module and at least one control IC.

惟以上所述者，僅為本發明之較佳實施例而已，並非用來限定本發明實施之範圍。故即凡依本發明申請範圍所述之形狀、構造、特徵及精神所為之均等變化或修飾，均應包括於本發明之申請專利範圍內。The above is only the preferred embodiment of the invention, and is not intended to limit the scope of the invention. Therefore, any changes or modifications of the shapes, structures, features and spirits described in the scope of the present invention should be included in the scope of the present invention.

2‧‧‧次圖框2‧‧‧ times frame

4‧‧‧顯示資料序列4‧‧‧Display data sequence

6‧‧‧黑畫面6‧‧‧Black screen

11‧‧‧液晶顯示面板11‧‧‧LCD panel

12‧‧‧畫素12‧‧‧ pixels

13‧‧‧資料驅動器13‧‧‧Data Drive

14‧‧‧掃瞄驅動器14‧‧‧Scan Drive

15‧‧‧背光模組15‧‧‧Backlight module

第1圖為先前技術電路架構示意圖。Figure 1 is a schematic diagram of a prior art circuit architecture.

第2圖為本發明之反應方式示意圖。Figure 2 is a schematic view of the reaction mode of the present invention.

第3圖為本發明之液晶發光亮度示意圖。Fig. 3 is a schematic view showing the luminance of liquid crystal light of the present invention.

第4圖為顯示資料輸入與初始輸入示意圖。Figure 4 is a schematic diagram showing data input and initial input.

第5圖為顯示資料輸入與初始輸入示意圖。Figure 5 shows the data input and initial input.

第6圖為液晶顯示面板的畫素結構圖。Fig. 6 is a diagram showing the pixel structure of the liquid crystal display panel.

第7圖為液晶顯示面板結構示意圖。Figure 7 is a schematic view showing the structure of a liquid crystal display panel.

第8圖為液晶顯示面板的畫素結構時間示意圖。Figure 8 is a schematic diagram showing the pixel structure time of the liquid crystal display panel.

2．．．次圖框2. . . Secondary frame

4．．．顯示資料序列4. . . Display data sequence

6．．．特定灰階6. . . Specific grayscale