200830252 九、發明說明： 【發明所屬之技術領域】 ' 本發明係關於一種液晶顯示裝置及其驅動方法。 【先前技術】 通常液晶顯示裝置的R、G、B三種顏色中的每一種顏 色都能夠顯示8bit即28 =256級的灰階，進而該液晶顯示裝置 能夠顯示28χ28 χ28 =16777216種顏色。 然，由於8bit資料驅動電路價格昂貴，為了降低成本， 目前之液晶顯示裝置之驅動電路10採用一圖框速率控制電 路（Frame Rate Conversion，FRC)12及一 6bit 資料驅動電路 (Source Driver) 14來實現8bit資料驅動電路的功能，如圖1 所示。該圖框速率控制電路12將顯示256級灰階的圖框轉換 為顯示64級灰階的圖框，該資料驅動電路14驅動該液晶顯 示裝置顯示晝面。 該圖框速率控制電路12的工作原理如圖2所示。設該 256級灰階分別為0、1、2、3、…、254、255，則該64級灰 階的輝度分別對應該256級灰階中的第0、4、8、…、248、 252級灰階的輝度。顯示256級灰階的一圖框（Frame)經該圖 框速率控制電路12轉換後，可用顯示64級灰階的四圖框來 代替，設該四圖框依次為第一圖框、第二圖框、第三圖框 及第四圖框。 由圖可見，若該第一、第二、第三及第四圖框的灰階 都為第4級灰階，則人眼感覺到的該四圖框的平均輝度為該 200830252 $ 4級灰階的輝度；若該第一、第二及第三圖框的灰階都為 該第4級灰階，該第四圖框的灰階為該第8級灰階，則由於 人眼的視覺暫留特性，人眼感覺到的該四圖框的平均輝度 為第5級灰階的輝度；若該第二及第四圖框的灰階都為該第 4級灰階，該第一及第三圖框的灰階都為該第8級灰階，則 由於人眼的視覺暫留特性，人眼感覺到的該四圖框的平均 輝度為第6級灰階的輝度；若該第一圖框的灰階為該第4級 灰階，該第二、第三及第四圖框的灰階都為該第8級灰階， 則由於人眼的視覺暫留特性，人眼感覺到的該四圖框的平 均輝度為第7級灰階的輝度；若該第一、第二、第三及第四 圖框的灰階都為第8級灰階，則人眼感覺到的該四圖框的平 均輝度為該第8級灰階的輝度。根據相同原理，通過該圖框 速率控制電路12，可用64級灰階的輝度來實現256級灰階的 輝度。 然，該顯示64級灰階的四圖框在其灰階變化時，該液 曰曰顯示装置顯不的晝面會產生閃燦現象’如圖3所示。設_ 圖框的週期為T，若該四圖框的灰階都為該第4級灰階或該 第8級灰階，則該液晶顯示裝置顯示晝面的閃爍週期為τ ; 若該第一與第三圖框的灰階都為該第8級灰階，該第二與該 第四圖框的灰階都為該第4級灰階，則該液晶顯示裝置顯示 晝面的閃燦週期為2Τ，右該弟^一、弟一及弟三圖框的灰階 都為該第4級灰階，該第四圖框的灰階為該第8級灰階，咬 該第一圖框的灰階為該第4級灰階，該第二、第三及第四圖 框的灰階都為該第8級灰階，則該液晶顯示裝置顯示晝面的 200830252 閃爍週期為4T。 •通常液晶顯示裝置刷新頻率為60ΗΖ，即圖框頻率為 60ΗΖ，SUb該液晶顯示裝置的閃爍頻率為6〇ηζ、3〇ηζ及 15 HZ。但由於30 HZ及15 HZ的晝面閃爍很容易被人眼察 覺到，因此該液晶顯示裝置存在明顯的晝面閃爍的現象， 使用者在觀看該液晶顯示裝置顯示晝面時有不適感，不利 於使用者的視覺健康。 【發明内容】 有鑑於此’提供一種可改善晝面閃燦之液晶顯示 實為必要。 同¥有必要提供—種可改善晝面閃爍之液晶顯示裝置 驅動方法。 -種液晶顯示裝置’其包括一資料驅動電路，一圖框 :玄:二控制电路’一貧料分配器及一圖框緩衝器，該圖框速 電路包括複數灰階查找表，其中，該圖框緩衝器藉 哭二框f率控制電路電連接該資料分配器，該資料分配 ^ 據線與該資料驅動電路電連接，該圖框緩衝器 視@訊遗對應的每—圖框轉換成複數個子圖框以提 ==頻訊號的圖框頻率，並將該圖框頻率提高後的視 接^㈣該®框速率控制電路’該圖框速率控制電路 朽矣^圖框緩衝讀出之視頻訊號’並通過該複數灰階查 頻訊號的灰階進行轉換，該資料分配器接收該 p白轉換錢視頻訊號’並將該視頻訊號分複數路傳送到 200830252 該貧料驅動電路，該資料驅動電路接收該複數路視頻訊號 並驅動液晶顯示裝置顯示晝面。 種液晶顯示裝置驅動方法，其包括以下步驟：步驟 一，將輸入視頻訊號對應的每一圖框轉換成複數個子圖 框；步驟二，將該複數個子圖框的灰階通過灰階查找表進 行轉換，並選擇輸出灰階轉換後的複數個子圖框對應的視 頻訊號；步驟三，將灰階轉換後的視頻訊號分複數路傳送； 步驟四，接收該複數路視頻訊號，並驅動該液晶顯示裝置 顯不晝面。 與先前技術相比，本發明之液晶顯示裝置的驅動電路 用該圖框緩衝器將每一圖框轉換成完全相同的第一及第二 子圖框，使其輸出的視頻訊號的圖框頻率變為，進 而使該圖框速率控制電路輸出通過該第一、第二灰階杳找 表灰階轉換後的視頻訊號的圖框頻率為12〇Ήζ，即該液晶 顯示裝置的圖框頻率變為120ΗΖ。且該圖框速率控^電: 用顯示64級灰階的二子圖框來實現顯示256級灰階的一圖 框，因此，該液晶顯示裝置顯示的晝面閃爍頻率變為12〇ΗΖ 與60ΗΖ，由於120ΗΖ與60ΗΖ的晝面閃爍不易被人眼察覺， 從而有效克服了該液晶顯示裝置晝面閃爍的問題，使用者 在觀看該液晶顯示裝置顯示晝面時不會有不適感，亦不會 影響使用者的視覺健康。 " 曰 【實施方式】 請參閱圖4 係本發明置之驅動電路示意 200830252 圖。該驅動電路40包括一圖框緩衝器（5^1116611££61*)41、一 圖框速率控制電路42、一資料分配器（Data Divider)43及一 資料驅動電路（Source Driver)44。 該圖框速率控制電路42包括一第一記憶體421、一第二 記憶體423及一多工器（Multiplexer)425。 該圖框缓衝器41分別藉由該第一記憶體421、該第二記 憶體423與該多工器425電連接，該多工器425同時還與該資 料分配器43電連接，該資料分配器43藉由二數據線與該資 ⑩料驅動電路44電連接。 該圖框缓衝器41在每一圖框時間内將每一圖框轉換成 完全相同的二子圖框（Subframe)。該圖框速率控制電路42 將每個顯示256級灰階的圖框轉換為顯示64級灰階的圖 框。該第一、第二記憶體421、423分別儲存一第一、第二 灰階查找表，該第一、第二灰階查找表分別轉換該顯示64 級灰階的二子圖框。該多工器425控制該二子圖框的輸出順 序。該資料分配器43將該二子圖框對應的視頻訊號分多路 ® 輸出。該資料驅動電路44驅動該液晶顯示裝置顯示晝面。 該第一、第二記憶體421、423中儲存的該第一、第二 灰階查找表的生成方法如下： 將經該圖框緩衝器41轉換後的二子圖框依次設為第一 子圖框及第二子圖框，設輸入該圖框速率控制電路42的256 級灰階分別為0、1、2、3、…、254、254、255，則經該圖 框速率控制電路42轉換後的64級灰階輝度分別為該256級 灰階中的第0、4、8、…、248、252級灰階輝度。灰階輝度 200830252 可用光透過液晶層的穿透率，即如下式子：200830252 IX. Description of the Invention: [Technical Field to Which the Invention Is Ascribed] The present invention relates to a liquid crystal display device and a method of driving the same. [Prior Art] Generally, each of the three colors of R, G, and B of the liquid crystal display device can display 8 bits, i.e., 28 = 256 gray scales, and the liquid crystal display device can display 28 χ 28 χ 28 = 16,777,216 colors. However, since the 8-bit data driving circuit is expensive, in order to reduce the cost, the driving circuit 10 of the current liquid crystal display device adopts a frame rate control circuit (FRC) 12 and a 6-bit data driver circuit (Source Driver) 14 . The function of the 8-bit data driving circuit is realized, as shown in Figure 1. The frame rate control circuit 12 converts the frame displaying the 256-level gray scale into a frame displaying the 64-level gray scale, and the data driving circuit 14 drives the liquid crystal display device to display the screen. The working principle of the frame rate control circuit 12 is as shown in FIG. 2. Let the 256-level grayscale be 0, 1, 2, 3, ..., 254, 255, respectively, then the luminance of the 64-level grayscale corresponds to the 0th, 4th, 8th, ..., 248th of the 256 grayscale respectively. The brightness of the 252 gray scale. A frame displaying a 256-level gray scale is converted by the frame rate control circuit 12, and can be replaced by a four-frame that displays a 64-level gray scale, and the four frames are sequentially the first frame and the second frame. Frame, third frame and fourth frame. It can be seen from the figure that if the gray levels of the first, second, third and fourth frames are all the fourth level gray scale, the average brightness of the four frames perceived by the human eye is the 200830252 $4 gray. The luminance of the order; if the gray levels of the first, second, and third frames are the gray level of the fourth level, and the gray level of the fourth frame is the gray level of the eighth level, due to the vision of the human eye The persistence characteristic, the average luminance of the four frames perceived by the human eye is the luminance of the fifth-order grayscale; if the grayscales of the second and fourth frames are the fourth-order grayscale, the first The gray level of the third frame is the gray level of the eighth level, and the average brightness of the four frames perceived by the human eye is the brightness of the sixth level gray level due to the visual persistence characteristic of the human eye; The gray level of a frame is the gray level of the fourth level, and the gray levels of the second, third and fourth frames are all the gray level of the eighth level, and the human eye feels due to the persistence characteristic of the human eye. The average luminance of the four frames is the luminance of the seventh grayscale; if the grayscales of the first, second, third, and fourth frames are the eighth grayscale, the human eye feels The average glow of the four frames The degree is the luminance of the gray level of the eighth level. According to the same principle, by the frame rate control circuit 12, the luminance of the 256-level gray scale can be realized by the luminance of the 64-level gray scale. However, the four frames showing the 64-level gray scale will have a flashing phenomenon when the gray scale changes, and the visible surface of the liquid helium display device will appear as shown in Fig. 3. Let the period of the _ frame be T, and if the gray level of the four frames is the fourth level gray level or the eighth level gray level, the liquid crystal display device displays the blinking period of the pupil surface as τ; The gray scales of the first and third frames are both the gray level of the eighth level, and the gray levels of the second and fourth frames are the gray level of the fourth level, and the liquid crystal display device displays the flash of the surface The period is 2Τ, and the gray level of the right frame of the brothers, the brothers and the brothers is the gray level of the fourth level, and the gray level of the fourth frame is the gray level of the eighth level, biting the first figure. The gray level of the frame is the gray level of the fourth level, and the gray levels of the second, third and fourth frames are all the gray level of the eighth level, and the liquid crystal display device displays the 200830252 blinking period of the front surface as 4T. • Generally, the refresh rate of the liquid crystal display device is 60 ΗΖ, that is, the frame frequency is 60 ΗΖ, and the flashing frequency of the SUb liquid crystal display device is 6 〇ηζ, 3〇ηζ, and 15 HZ. However, since the flickering of the surface of 30 HZ and 15 HZ is easily perceived by the human eye, the liquid crystal display device has a clear flickering phenomenon, and the user feels uncomfortable when viewing the liquid crystal display device to display the kneading surface, which is disadvantageous. For the visual health of the user. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a liquid crystal display which can improve the flashing of the face. It is necessary to provide a driving method for a liquid crystal display device which can improve the flickering of the face. a liquid crystal display device comprising a data driving circuit, a frame: a second control circuit, a poor material distributor and a frame buffer, the frame speed circuit comprising a complex gray scale lookup table, wherein The frame buffer is electrically connected to the data distributor by a crying frame f rate control circuit, and the data distribution data line is electrically connected to the data driving circuit, and the frame buffer is converted into a frame corresponding to the @讯遗a plurality of sub-frames to raise the frame frequency of the == frequency signal, and increase the frame frequency after the connection ^ (4) the frame rate control circuit 'the frame rate control circuit 矣 ^ frame buffer read The video signal 'converts through the gray scale of the complex gray-scale frequency-checking signal, and the data distributor receives the p-white converted money video signal' and transmits the video signal to the 200830252 poor-cause driving circuit. The driving circuit receives the plurality of video signals and drives the liquid crystal display device to display the surface. A liquid crystal display device driving method includes the following steps: Step 1: converting each frame corresponding to the input video signal into a plurality of sub-frames; and step 2, performing gray scale of the plurality of sub-frames through the gray-scale lookup table Converting and selecting the video signal corresponding to the plurality of sub-frames after the gray scale conversion; in step 3, the video signal converted by the gray scale is divided into multiple channels; and step 4, receiving the video signal of the plurality of channels and driving the liquid crystal display The device is not visible. Compared with the prior art, the driving circuit of the liquid crystal display device of the present invention converts each frame into identical first and second sub-frames by using the frame buffer, so as to output the frame frequency of the video signal. Changing, the frame rate control circuit outputs the frame frequency of the video signal converted by the gray scale conversion of the first and second gray scales to be 12 〇Ήζ, that is, the frame frequency of the liquid crystal display device is changed. It is 120ΗΖ. And the frame rate control is performed: a frame displaying 256-level gray scale is realized by using two sub-frames of 64-level gray scale, and therefore, the blinking frequency of the display of the liquid crystal display device becomes 12〇ΗΖ and 60ΗΖ. Since the flickering of 120ΗΖ and 60ΗΖ is not easily perceived by the human eye, the problem of flickering of the liquid crystal display device is effectively overcome, and the user does not feel uncomfortable when viewing the liquid crystal display device, and does not Affect the visual health of the user. " 曰 [Embodiment] Please refer to FIG. 4 which is a schematic diagram of the driving circuit of the present invention. The drive circuit 40 includes a frame buffer (5^1116611££61*) 41, a frame rate control circuit 42, a data distributor (Data Divider) 43, and a data driver circuit (Source Driver) 44. The frame rate control circuit 42 includes a first memory 421, a second memory 423, and a multiplexer 425. The frame buffer 41 is electrically connected to the multiplexer 425 by the first memory 421 and the second memory 423. The multiplexer 425 is also electrically connected to the data distributor 43 at the same time. The distributor 43 is electrically connected to the material drive circuit 44 by two data lines. The frame buffer 41 converts each frame into exactly the same two sub-frames in each frame time. The frame rate control circuit 42 converts each frame displaying 256 levels of gray scale into a frame displaying 64 levels of gray scale. The first and second memory blocks 421 and 423 respectively store a first and second gray scale lookup table, and the first and second gray scale lookup tables respectively convert the two sub-frames displaying the 64-level gray scale. The multiplexer 425 controls the output order of the two sub-frames. The data distributor 43 divides the video signal corresponding to the two sub-frames into multiple outputs. The data driving circuit 44 drives the liquid crystal display device to display the face. The first and second gray-scale lookup tables stored in the first and second memories 421 and 423 are generated as follows: The two sub-frames converted by the frame buffer 41 are sequentially set as the first sub-picture The frame and the second sub-frame are arranged such that the 256-level gray scales input to the frame rate control circuit 42 are 0, 1, 2, 3, ..., 254, 254, 255, respectively, and are converted by the frame rate control circuit 42. The subsequent 64-level grayscale luminance is the 0th, 4th, 8th, ..., 248th, 252th grayscale luminance in the 256th grayscale. Grayscale brightness 200830252 The transmittance of light that can pass through the liquid crystal layer, which is as follows:
L r gray level r 255 來表示，其中L表示光透過液晶層的穿透率，gray level表示 灰階級數，z為一常量，通常取值為2.2。 設該第一子圖框的灰階級數為104,則光透過液晶層的 穿透率L r gray level r 255 is used, where L is the transmittance of light transmitted through the liquid crystal layer, gray level is the number of gray levels, z is a constant, and is usually 2.2. Let the number of gray levels of the first sub-frame be 104, the transmittance of light transmitted through the liquid crystal layer
Ll = ( ：0.13902245 104)2 2 255 設該第二子圖框的灰階級數為100,則光透過液晶層的 穿透率 12 =(黑)22 =0.12752977 ; 該穿透率L2與該穿透率L1的平均值 L3 二=嗖―竺，2752977 = Q1332761。 2 2 當灰階級數為102時，光透過液晶層的穿透率 14 = C2.2 = 0.1332085， 255 L3與L4取值接近，因此輸入該圖框速率控制電路42的 256級灰階中的第102級灰階輝度，可由經該圖框速率控制 電路42轉換後的64級灰階中的第100級及第104級灰階輝度 來實現，如圖5所示。曲線51表示在t0到tl時間内，該第一 子圖框的灰階級數為104時，光透過液晶層的輝度曲線。曲 線53表示在tl到t2的時間内，該第二子圖框的灰階級數為 100時，光透過液晶層的輝度曲線。由於人眼的視覺暫留特 性，在t0到t2時間内，人眼感覺到的光透過液晶層的輝度 如曲線55所示，即在t0到t2時間内，人眼感覺到的輝度對 應的灰階級數為102。 將該256級灰階的級數102及其對應的二子圖框的灰階 11 200830252 級數104、100分別儲存在該第一、第二記憶體421、423中， 即將數組（102,104)儲存在該第一記憶體421中，將數組 (\〇2，100)儲存在該第二記憶體423中，其中，102表示該256 級灰階中的第102級，104、100分別表示該二子圖框所對應 的灰階為第104級及第1〇〇級。 根據相同原理，若該第一子圖框的灰階級數為128,則 光透過液晶層的穿透率 11 = (^)2.^0 2195197 ； 若該第二子圖框的灰階級數為60，則光透過液晶層的 穿透率 (見尸 該穿透率L1與該穿透率L2的平均值 L2 = 0.0414519 0.1332761 L1 + L2 0.2195197 + 0.0414519 當灰階級數為101時，光透過液晶層的穿透率 ini L4 = (iri)2-2 =0.1303523 5 u 255Ll = ( :0.13902245 104)2 2 255 Let the number of gray levels of the second sub-frame be 100, the transmittance of light through the liquid crystal layer 12 = (black) 22 = 0.12752977; the penetration rate L2 and the wear The average value of the permeability L1 is L3, two = 嗖 - 竺, 2752977 = Q1332761. 2 2 When the number of gray levels is 102, the transmittance of light through the liquid crystal layer 14 = C2.2 = 0.1332085, 255 L3 is close to the value of L4, so it is input into the 256-level gray scale of the frame rate control circuit 42. The gray level luminance of the 102nd level can be realized by the gray level luminance of the 100th level and the 104th level of the 64 gray scale converted by the frame rate control circuit 42, as shown in FIG. 5. A curve 51 indicates a luminance curve through which the light passes through the liquid crystal layer when the number of gray levels of the first sub-frame is 104 in the period from t0 to tl. The curve 53 indicates the luminance curve of the light transmitted through the liquid crystal layer when the number of gray levels of the second sub-frame is 100 in the period from t1 to t2. Due to the visual persistence characteristic of the human eye, the luminance perceived by the human eye through the liquid crystal layer is as shown by the curve 55 in the time t0 to t2, that is, the gray corresponding to the brightness perceived by the human eye in the time t0 to t2 The number of classes is 102. The level 102 of the 256-level gray scale and the gray scale 11 200830252 series 104, 100 of the corresponding two sub-frames are stored in the first and second memories 421, 423, respectively, and the array (102, 104) is stored in In the first memory 421, an array (\〇2, 100) is stored in the second memory 423, wherein 102 represents the 102nd level of the 256-level gray scale, and 104 and 100 respectively represent the two sub-pictures The gray scale corresponding to the box is level 104 and level 1. According to the same principle, if the number of gray levels of the first sub-frame is 128, the transmittance of light through the liquid crystal layer is 11 = (^) 2.^0 2195197; if the number of gray levels of the second sub-frame is 60, the transmittance of light passing through the liquid crystal layer (see the average value of the transmittance L1 and the transmittance L2 L2 = 0.0414519 0.1332761 L1 + L2 0.2195197 + 0.0414519 when the number of gray levels is 101, the light passes through the liquid crystal layer Transmittance ini L4 = (iri)2-2 =0.1303523 5 u 255
L3與L4取值接近，因此256級灰階中的第101級灰階輝 度可由64級灰階中的第128級及第60級灰階輝度來實現。將 該256級灰階的級數1〇1及其對應的二子圖框的灰階級數 128、60分別儲存在該第一、第二記憶體421、423中，即將 數組（101，128)儲存在該第一記憶體421中，將數組（101，60) 儲存在該第二記憶體423中，其中，101表示該256級灰階中 的第101級，128、60分別表示該二子圖框所對應的灰階為 第128級及第60級。依次類推，在該64級灰階中，適當取該 二子圖框的灰階，即可實現該256級灰階〇、1、2、3、…、 251、252中的任意一灰階輝度，如表1所不： 12 200830252 表1 256級灰 階級數 第一子圖 框的灰階 級數 第一灰階查找 表 第二子圖 框的灰階 級數 第二灰階查找 表 0 0 (0,0) 0 (0,0) 1 4 (1，4) 0 (1,0) 2 4 (2,4) 4 (2,4) 3 8 (3,8) 0 (3,〇) 4 8 (4,8) 4 (4,4) 5 12 (5,12) 0 (5,〇) 6 8 (6,8) 8 (6,8) 7 12 (7,12) 4 (7,4) 8 16 (8，16) 0 (8,〇) 9 12 (9,12) 8 (9,8) 10 16 (10,16) 4 (10,4) • · · … — 101 128 (101,128) 60 (101,60) 102 104 (102,104) 100 (102,100) … • · · 252 252 (252,252) 252 (252,252) 253 252 (252,252) 252 (252,252) 254 252 (252,252) 252 (252,252) 255 252 (252,252) 252 (252,252) 由於該64級灰階的最高灰階級數為252，所以該256級 13 200830252 灰階中的第253、254、255級灰階輝度都用該第252級灰階 輝度來實現。 下面以輸入圖框頻率為6〇112|的視頻訊號為例，具體說 明該驅動電路40的驅動方法： 步驟一’對輸入視頻訊號進行圖框頻率轉換。圖框頻 率為60HZ的視頻訊號傳送至該圖框缓衝器4丄，該圖框缓衝 器41將該視頻訊號對應的每一圖框轉換成完全相同的第一 及第二子圖框’該圖框緩衝器41輸出圖框頻率為l2〇HZ的 ⑩視頻訊號至該圖框速率控制電路4 2。 步驟二’轉換該視頻訊號的圖框對應的灰階。該圖框 頻率為120HZ的視頻訊號傳送至該圖框速率控制電路42之 第一記憶體421及第二記憶體423。設該第一子圖框的灰階 級數為102，則其對應的視頻訊號於該第一記憶體421中之 第一灰階查找表中查找到數組（102,104)，該灰階級數為 102的第一子圖框對應的視頻訊號轉換為灰階級數為1〇4對 鲁應的視頻訊號。該灰階級數為1〇2的第二子圖框對應的視頻 訊號，於該第二記憶體423中之第二灰階查找表中查找到數 組（102，100)，該灰階級數為1()2的第二子圖框對應的視頻 訊號轉換為灰階級數為100對應的視頻訊號。根據相同原 理，輸入該圖框速率控制電路42的第一、第二子圖框對應 的視頻訊號分別在該第一、第二記憶體421、423中進行相 應的轉換。 步驟三，選擇輸出灰階轉換後的視頻訊號。該多工器 425先輸出經該第一記憶體421灰階轉換後的視頻訊號，再 14 200830252 輸出經該第二記憶體423灰階轉換後的視頻訊號。此時，該 多工器425輸出的視頻訊號的圖框頻率為120HZ，該圖框頻 率為120HZ的視頻訊號傳送到該資料分配器43。 步驟四，視頻訊號號分複數路傳送。該資料分配器43 將接收到的該圖框頻率為120HZ的視頻訊號分為二圖框頻 率為60HZ的視頻訊號，該二圖框頻率為60HZ的視頻訊號 分別經由二數據線傳送至該資料驅動電路44。 步驟五，驅動液晶顯示裝置顯示畫面。該資料驅動電 _路44接收該圖框頻率為60ΉΖ的視頻訊號，並驅動該液晶顯 示裝置顯示圖框頻率為120HZ的晝面。 與先前技術相比，本發明之液晶顯示裝置驅動電路40 用該圖框缓衝器41將視頻訊號的一圖框轉換成完全相同的 第一及第二子圖框，使其輸出視頻訊號的圖框頻率變為 120HZ，進而使該圖框速率控制電路42輸出通過該第一、 第二灰階查找表灰階轉換後的圖框頻率為120HZ的視頻訊 號，即該液晶顯示裝置的圖框頻率變為120HZ。且該圖框 胃速率控制電路42用顯示64級灰階的二子圖框來實現顯示 25 6級灰階的一圖框，因此，該液晶顯示裝置顯示的畫面閃 爍頻率變為120HZ與60HZ，由於120ΉΖ與60HZ的晝面閃爍 不易被人眼察覺，從而有效克服了該液晶顯示裝置晝面閃 爍的問題，使用者在觀看該液晶顯示裝置顯示晝面時不會 有不適感，亦不會影響使用者的視覺健康。 該表1中的256級灰階對應的該第一、第二子圖框的灰 階級數還可有其他取值，並不限於上述實施方式。例如， 15 200830252 該256級灰階中的第102級對應的該第一、第二子圖框的灰 階級數還可分別為124、72。 綜上所述，本發明確已符合發明之要件，爰依法提出 專利申請。惟，以上該者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟習本案技藝 之人士援依本發明之精神所作之等效修飾或變化，皆應涵 蓋於以下申請專利範圍内。 ⑩【圖式簡單說明】 圖1係一種先前技術之液晶顯示裝置之驅動電路示意圖。 圖2係先前技術之圖框速率控制電路原理示意圖。 圖3係先前技術之液晶顯示裝置晝面閃爍示意圖。 圖4係本發明液晶顯示裝置之驅動電路示意圖。 圖5係本發明液晶顯示裝置之二子圖框灰階輝度示意圖。 【主要元件符號說明】 驅動電路 40 圖框緩衝器 41 圖框速率控制電路 42 第一記憶體 421 第二記憶體 423 多工器 425 資料分配器 43 資料驅動電路 44 16 51 200830252 第104級灰階的輝度曲線 第100級灰階的輝度曲線 第102級灰階的平均輝度曲線 53 55The values of L3 and L4 are close, so the gray level luminance of the 101st level in the 256-level gray scale can be realized by the 128th and 60th gray scale luminances of the 64-level gray scale. The gray level number 128 and 60 of the 256-level gray scale and the corresponding two sub-frames are stored in the first and second memory units 421 and 423, that is, the array (101, 128) is stored. In the first memory 421, the array (101, 60) is stored in the second memory 423, wherein 101 represents the 101st level of the 256-level gray scale, and 128, 60 respectively represent the two sub-frames The corresponding gray levels are level 128 and level 60. And so on, in the 64-level gray scale, the gray scale of the two sub-frames can be appropriately obtained, and any gray-scale luminance of the 256-level gray scale 〇, 1, 2, 3, ..., 251, 252 can be realized. As shown in Table 1: 12 200830252 Table 1 Gray class number of the first sub-frame of the 256-level gray-scale number First gray-scale lookup table Gray-level number of the second sub-frame Second gray-scale lookup table 0 0 (0, 0) 0 (0,0) 1 4 (1,4) 0 (1,0) 2 4 (2,4) 4 (2,4) 3 8 (3,8) 0 (3,〇) 4 8 ( 4,8) 4 (4,4) 5 12 (5,12) 0 (5,〇) 6 8 (6,8) 8 (6,8) 7 12 (7,12) 4 (7,4) 8 16 (8,16) 0 (8,〇) 9 12 (9,12) 8 (9,8) 10 16 (10,16) 4 (10,4) • · · ... — 101 128 (101,128) 60 ( 101,60) 102 104 (102,104) 100 (102,100) ... • · · 252 252 (252,252) 252 (252,252) 253 252 (252,252) 252 (252,252) 254 252 (252,252) 252 (252,252) 255 252 (252,252) 252 (252, 252) Since the highest gray level number of the 64-level gray scale is 252, the gray level luminance of the 253th, 254, and 255 levels in the 256 level 13 200830252 gray scale is implemented by the 252th gray scale luminance. The video signal with the input frame frequency of 6〇112| is taken as an example to specifically describe the driving method of the driving circuit 40: Step 1 'frame frequency conversion of the input video signal. The video signal with the frame frequency of 60 Hz is transmitted to the frame buffer 4, and the frame buffer 41 converts each frame corresponding to the video signal into identical first and second sub-frames' The frame buffer 41 outputs 10 video signals having a frame frequency of l2 〇 HZ to the frame rate control circuit 42. Step 2 'converts the gray level corresponding to the frame of the video signal. The video signal of the frame frequency of 120 Hz is transmitted to the first memory 421 and the second memory 423 of the frame rate control circuit 42. If the number of gray levels of the first sub-frame is 102, the corresponding video signal finds an array (102, 104) in the first gray-scale lookup table in the first memory 421, and the number of gray levels is 102. The video signal corresponding to the first sub-frame is converted into a video signal with a gray level of 1 〇 4 pairs of Lu Ying. The video signal corresponding to the second sub-frame of the gray level is 1〇2, and the array (102, 100) is found in the second gray level lookup table in the second memory 423, and the gray level is 1 The video signal corresponding to the second sub-frame of (2) is converted into a video signal corresponding to the gray level number of 100. According to the same principle, the video signals corresponding to the first and second sub-frames input to the frame rate control circuit 42 are respectively converted in the first and second memories 421 and 423. Step 3: Select the output video signal after the grayscale conversion. The multiplexer 425 first outputs the video signal after the grayscale conversion of the first memory 421, and then outputs the video signal after the grayscale conversion of the second memory 423 by the 200828252. At this time, the frame frequency of the video signal output by the multiplexer 425 is 120 Hz, and the video signal of the frame frequency of 120 Hz is transmitted to the data distributor 43. In step four, the video signal number is transmitted in multiple numbers. The data distributor 43 divides the received video signal with the frame frequency of 120 Hz into a video signal with a frame frequency of 60 Hz, and the video signals of the frame frequency of 60 Hz are respectively transmitted to the data driver via the two data lines. Circuit 44. In step 5, the liquid crystal display device is driven to display a screen. The data driving circuit 44 receives the video signal having the frame frequency of 60 , and drives the liquid crystal display device to display the frame surface having a frame frequency of 120 Hz. Compared with the prior art, the liquid crystal display device driving circuit 40 of the present invention converts a frame of the video signal into identical first and second sub-frames by using the frame buffer 41 to output the video signal. The frame frequency is changed to 120 Hz, and the frame rate control circuit 42 outputs a video signal having a frame frequency of 120 Hz after the gray scale conversion of the first and second gray scale lookup tables, that is, a frame of the liquid crystal display device. The frequency becomes 120HZ. And the frame stomach rate control circuit 42 realizes a frame displaying the gray level of the gray level by using the two sub-frames of the 64-level gray scale, and therefore, the screen flicker frequency displayed by the liquid crystal display device becomes 120HZ and 60HZ, The flickering of 120ΉΖ and 60HZ is not easy to be perceived by the human eye, thereby effectively overcoming the problem of flickering of the liquid crystal display device. The user does not feel uncomfortable when viewing the liquid crystal display device, and does not affect the use. The visual health of the person. The number of gray levels of the first and second sub-frames corresponding to the 256-level gray scale in Table 1 may have other values, and is not limited to the above embodiment. For example, 15 200830252 The number of gray levels of the first and second sub-frames corresponding to the 102nd level of the 256-level gray scale may also be 124, 72, respectively. In summary, the present invention has indeed met the requirements of the invention, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It is covered by the following patent application. 10 [Simplified description of the drawings] Fig. 1 is a schematic diagram of a driving circuit of a prior art liquid crystal display device. 2 is a schematic diagram of the principle of the frame rate control circuit of the prior art. 3 is a schematic view showing the flashing of the liquid crystal display device of the prior art. 4 is a schematic view showing a driving circuit of a liquid crystal display device of the present invention. FIG. 5 is a schematic diagram showing the gray scale luminance of the two sub-frames of the liquid crystal display device of the present invention. [Description of main component symbols] Driving circuit 40 Frame buffer 41 Frame rate control circuit 42 First memory 421 Second memory 423 Multiplexer 425 Data distributor 43 Data driving circuit 44 16 51 200830252 Level 104 gray scale The luminance curve of the 100th gray scale of the luminance curve The average luminance curve of the gray scale of the 102nd grade 53 55
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