200528833 玖、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器之背光模組的驅動方法，特 別是一種液晶顯示器之背光模組的驅動方法，其係可減少一液 晶顯示器在動晝（moving pictures)播映時產生拖影 (motion - blurring)現象。 【先前技術】 薄膜電晶體液晶顯示面板主要是利用呈矩陣狀排列的薄膜電晶 體，配合適當的電容、連接塾(bonding pad)等電子元件來驅動液晶像 素，以產生豐富亮麗的圖形。由於薄膜電晶體液晶顯示面板具有外型 輕薄、耗電量少以及無輻射污染等特性，因此被廣泛地應用在筆記型 電腦（notebook)、個人數位助理（PDA)等攜帶式資訊產品上，甚至已有 逐漸取代傳統CRT監視器的趨勢。 請參考圖一，圖一係為一液晶顯示器之剖面示意圖。如圖一所示， 一液晶顯示器10包含有一顯示面板12與一背光模組14，設於顯示面 板12下方。其中，顯示面板12包含有一上基板、一下基板μ、與 一液晶分子層20設於上基板16與下基板18之間，而背光模組14 ^ 為一直下式(direct-type)背光模組，其包含有一光源22、與一擴散板 24設於光源22之上，且光源22另包含有複數支直形燈管池與反射 板22b，用來提供適當的亮度給顯示面板12，以使顯示面板12產生影 思的疋，由域曰曰分子對上基板16與下基板Μ之夾差電壓 的反應速度的隱，m此當液晶顯示器1()销 生拖影的現象，而導致動晝顯示品質 、旦守，八^邑產 貝卜1牛此外，由於液晶顯示器10 200528833 有逐漸取代傳統CRT監視器的趨勢， 、 顯示品質便係為一門重要課題。 &，改善液晶顯示器10之動畫 請參考圖二，圖二係為習知解 圖。如圖二麻，於—書面";、之拖影現象的方法示意 入至液晶顯示面板12後，液日顯將―影像訊號之電舰波26輸 化，同時並將燈管22a完全=應=穿= 晶顯示，12的穿透率係隨時間增加而增加，#時段μ，液4 不面板12的穿透率則約略維持固定。另—方面 二 =面週 =内，便將燈管22a完全地關閉（t_㈣，段 τ3内’液日日巧不面板12的穿透率係隨時間增加而減少，而在時段丁4内， 液晶顯示面板12的穿透率則約略維持固定。也就是說，f知方法乃係 將燈官22a週期性地·與完全關，以減少拖影現象之產生。 —然而，習知方法係藉由週期性的開啟與完全關閉燈管22a，所以燈 官22a的螢光層等相關發光材料必須具有快速的反應特性，而此種材 料的價格高昂，將會增加燈管22a的生產成本。此外，開啟與完全關 閉燈管22a的頻率越高，則燈管22a的壽命會越短。並且，由於習知 方法乃係週期性地開啟與完全關閉燈管22a，因此在燈管22a的關閉時 間内，不但晝面的整體亮度會偏低，進而降低液晶顯示器1〇的顯示品 質，而且由燈管22a完全關閉的狀態再次開啟燈管22a亦需要較長的 反應時間。 【發明内容】 本發明的目的是提供一種液晶顯示器之背光模組的驅動 方法，以解決前述問題。 依據本發明之目的，本發明的較佳實施例係提供一種液晶 200528833 顯不器之背光模組的驅動方法’該背光模組係包含有至少一第 -燈管與-第二燈管。首先，於—第一畫面週期(frameperi〇d) 内，驅動該第-燈管產生-第—亮度，並驅動該第二燈管產生 一第一冗度。隨後’於一第二晝面週期内，驅動該第一燈管產 生該第二亮度’並驅動該第二燈管產生該第一亮度，其中該第 二畫面週期係位於該第一晝面週期之後。 由於本發明之該第-、與該第二燈管_期性地產生該第一亮度 與該第二亮度可增加該第-、與該第二燈管的壽命，並降低製 造該第-、與該第二燈管的生產成本’更可提升晝面的整體亮度，並 縮短亮度變化的響應時間。 【實施方式】 請參考圖三至圖五，圖三係為本發明液晶顯示器之方塊圖，圖四與 圖五係為本發明液晶顯示器之驅動方法的時序示意圖。如圖三所示， -液晶顯示器3G包含有-顯示面板32、與-f光模組34設於顯示面 板32下方，用以供應亮度充分且分佈均勻的絲，以使顯示面板％ 能夠顯示影像。其中’顯示面板32包含有一上基板(未顯示）、一下基 板（未顯不）、以及-液晶分子層（未齡）設㈣上基板與該下基板之 間。此外，顯示面板12另包含有複數條掃描線％〜&、複數條資料線 DL广DL、以及複數個晝素36電連接於各掃描線SL〜SLn與各資料線 DL·〜DLm之間，並且各晝素36均至少包含有一液晶電容(未顯示）與一薄 膜電晶體(未顯不），各該薄膜電晶體係用來作為各晝素36白勺開關元件 (switch device)。另一方面，背光模組34係為一直下式背光模組， 其包含有-外殼38、複數支平行排列的直形燈管術、働、徽血獅、 以及複數個反相器（inVerter)5〇a、50b、5〇c與50d，各直形燈管4〇a、 40b、40c與40cH系包含有-冷陰極螢光燈f、一發光二極體燈管或一 有機發光二極體燈管，而各反相器5Ga、5Gb、咖與5()d _來驅動 200528833 各直形燈管40a、40b、40c與40d，以使各直形燈管4〇a、4〇b、40c與 40d產生光線。 如圖一所示，液晶顯示器#包含有一時間控制器⑴ control ler)42、一閘極驅動器（gate driver)44、一源極驅動器（s〇urce driver)46、以及一背光控制器（backiighi： contr〇iier)48。其中，時 間控制為42乃係用來控制閘極驅動器44、源極驅動器仙與背光控制 器48，閘極驅動器、44係用以輸出掃描訊號至各掃描線SLi〜SL，源極 驅動器46係用來輸入影像訊號至各資料線DLi〜DL，而背光控制器仙 則係用來驅動背光模組34以產生適當的光線。 接著，將更進一步地說明液晶顯示器3〇的驅動方法。首先，當時 間控制器42接收到來自外界的影像資料(vide〇 data)、水平同步二^ (horizontal synchronizing signal，HSYNC)與垂直同步訊號 (vertical synchronizing Signal，VSYNC)時，時間控制器犯會將該b 景;^像資料分告彳成紅色、藍色與綠色影像訊號，並分別將該紅色、該藍 色與該綠色影像訊號輸入源極驅動器46。同時，時間控制器42會分; 依據該水平同步訊號與該垂直同步訊號而產生一時脈訊號(d〇t c^ck， Dclk)與一閘極起始脈波(gate stan pulse，Gsp)，並將該時脈訊號 Dclk與該閘極啟始脈波GSP分別輸入源極驅動器46與閘極驅動器44， 以控制源極驅動器46與閘極驅動器44的動作時序。此外，時間控制 器42會輸入一控制訊號至背光控制器48，以使背光控制器仙依^輸 入一脈波訊號至各反相器5〇3、5013、5(^與50(1，而各反相器5(^、5〇1)、 50c與50d可依據各該脈波訊號來驅動燈管4〇a、4〇b、4〇c與4〇d，產 生適當的亮度。 ^ 如圖三所示，當閘極驅動器44接受到該閘極起始脈波GSp後，問 極驅動器44會相對應地產生一掃描訊號Si，並將掃描訊號&傳至第一 列的掃描線SL·，而掃描訊號&會經由掃描線SL·而傳送至各個薄膜電 11 200528833 DL.DL，^：Z^T 46 接收到該聲像T卢⑼1的各個畫素36會經由各資料線DLi〜DL,而 j茨〜像讯唬，而掃描線SL·上的各個圭辛如筏#祕# 的«透率’並且維持 隨後，待第一列播扣铃〇… 一’&^Urame peri〇d)。 閘極驅動哭44便]/各個晝素％均接收到該影像訊號之後， 咖1Γ 1極驅動器44將一掃描訊號&傳至第-列 翁，2，以開啟連接於掃描線 J弟:歹」 上述步驟，以使液晶顯示器30完成_個晝面亚重複 圖三方法以及控制時序將說明如下。如 中脈波管ρ在Βί 輸入—脈波訊號Ρι至反相器50a，其200528833 (1) Description of the invention: [Technical field to which the invention belongs] The present invention relates to a method for driving a backlight module of a liquid crystal display, in particular to a method for driving a backlight module of a liquid crystal display, which can reduce the movement of a liquid crystal display. Motion-blurring occurs during moving pictures. [Previous technology] Thin film transistor liquid crystal display panels mainly use thin film transistors arranged in a matrix, with appropriate capacitors, and electronic components such as bonding pads to drive liquid crystal pixels to produce rich and beautiful graphics. Thin-film transistor liquid crystal display panels are widely used in portable information products such as notebooks and personal digital assistants (PDAs) because they are thin and light, consume less power, and have no radiation pollution. There has been a trend to gradually replace traditional CRT monitors. Please refer to FIG. 1, which is a schematic cross-sectional view of a liquid crystal display. As shown in FIG. 1, a liquid crystal display 10 includes a display panel 12 and a backlight module 14, which are disposed below the display panel 12. The display panel 12 includes an upper substrate, a lower substrate μ, and a liquid crystal molecular layer 20 disposed between the upper substrate 16 and the lower substrate 18, and the backlight module 14 is a direct-type backlight module. The light source 22 includes a light source 22 and a diffuser plate 24 disposed on the light source 22. The light source 22 further includes a plurality of straight lamp tube pools and a reflection plate 22b for providing appropriate brightness to the display panel 12 so that The display panel 12 has a shadowy effect, which is caused by the reaction speed of the molecules to the voltage difference between the upper substrate 16 and the lower substrate M. When the liquid crystal display 1 () loses the smear phenomenon, it causes motion. Daytime display quality, once guarded, Babu 1 cow produced by Ba Yiyi In addition, since the LCD monitor 10 200528833 has gradually replaced the traditional CRT monitor, display quality is an important issue. &, Improving the animation of the liquid crystal display 10 Please refer to FIG. 2, which is a conventional solution. As shown in the second figure, after the method of "writing" is shown in the LCD panel 12, the liquid signal is transmitted to the electric wave 26 of the image signal, and the lamp tube 22a is completely = It should be shown that the transmittance of 12 increases with time, and the transmittance of the liquid 4 panel 12 is maintained at about a fixed period. On the other hand, the second aspect = surface area = inside, the lamp tube 22a is completely turned off (t_㈣, the penetration rate of the liquid crystal panel 12 in the section τ3 decreases with time, and in the period D4, The transmittance of the liquid crystal display panel 12 is maintained approximately constant. That is to say, the f-knowledge method is to periodically and completely turn off the lamp officer 22a to reduce the occurrence of smear.-However, the conventional method is to borrow Since the lamp tube 22a is turned on and off completely periodically, the relevant luminescent materials such as the fluorescent layer of the lamp officer 22a must have fast response characteristics, and the high price of this material will increase the production cost of the lamp tube 22a. The higher the frequency of turning on and completely closing the lamp tube 22a, the shorter the life of the lamp tube 22a. Moreover, since the conventional method is to turn on and off the lamp tube 22a periodically, the closing time of the lamp tube 22a In addition, not only the overall brightness of the daylight surface will be low, which will reduce the display quality of the liquid crystal display 10, but also the lamp 22a will be turned on again after the lamp 22a is completely turned off. It also requires a long response time. [Summary of the Invention] The present invention of The purpose is to provide a method for driving a backlight module of a liquid crystal display to solve the foregoing problems. According to the purpose of the present invention, a preferred embodiment of the present invention provides a method for driving a backlight module of a liquid crystal 200528833 display 'the backlight The module system includes at least a first-lamp and a second-lamp. First, during the first frame period, the first-lamp is driven to generate the first-brightness, and the second-lamp is driven. The lamp produces a first degree of redundancy. Then 'the first lamp is driven to generate the second brightness in a second day-to-day period' and the second lamp is driven to generate the first brightness, where the second picture The period is located after the first day-to-day period. Since the first and second lamps of the present invention periodically generate the first brightness and the second brightness, the first and second lamps can be increased. The life of the tube and the reduction of the production costs of the first and second lamp tubes can further improve the overall brightness of the daytime surface and shorten the response time of the brightness change. [Embodiment] Please refer to Figures 3 to 5, Figure 3 is the liquid crystal display of the present invention The block diagrams, Figures 4 and 5 are timing diagrams of the driving method of the liquid crystal display of the present invention. As shown in Figure 3,-the liquid crystal display 3G includes-a display panel 32, and -f light module 34 is provided on the display panel 32 The lower part is used to supply sufficient and uniformly distributed filaments so that the display panel can display images. The display panel 32 includes an upper substrate (not shown), a lower substrate (not shown), and a liquid crystal molecular layer ( (Unaged) is provided between the upper substrate and the lower substrate. In addition, the display panel 12 further includes a plurality of scan lines% ~ & Between the lines SL ~ SLn and each data line DL · ~ DLm, and each day element 36 includes at least a liquid crystal capacitor (not shown) and a thin film transistor (not shown), each thin film transistor system is used as Each day element is a switch device. On the other hand, the backlight module 34 is a direct type backlight module, which includes a housing 38, a plurality of parallel-shaped straight tube lamps, a badger, a blood lion, and a plurality of inverters (inVerter). 50a, 50b, 50c, and 50d, each of the straight lamp tubes 40a, 40b, 40c, and 40cH includes-cold cathode fluorescent lamp f, a light-emitting diode lamp or an organic light-emitting diode Body lamps, and inverters 5Ga, 5Gb, and 5 () d_ to drive 200528833 straight lamp tubes 40a, 40b, 40c and 40d, so that each straight lamp tube 40a, 40b , 40c and 40d produce light. As shown in FIG. 1, the liquid crystal display # includes a time controller (controller) 42, a gate driver (44), a source driver (46), and a backlight controller (backiighi: controier) 48. Among them, the time control is 42 is used to control the gate driver 44, the source driver and the backlight controller 48, the gate driver, 44 is used to output the scanning signal to each scanning line SLi ~ SL, and the source driver 46 is It is used to input image signals to the data lines DLi ~ DL, and the backlight controller is used to drive the backlight module 34 to generate appropriate light. Next, a driving method of the liquid crystal display 30 will be further explained. First, when the time controller 42 receives video data, horizontal synchronizing signal (HSYNC), and vertical synchronizing signal (VSYNC) from the outside, the time controller will The b scene image data is divided into red, blue, and green image signals, and the red, blue, and green image signals are input to the source driver 46, respectively. At the same time, the time controller 42 will divide; generate a clock signal (d0tc ^ ck, Dclk) and a gate start pulse (Gsp) based on the horizontal synchronization signal and the vertical synchronization signal, and The clock signal Dclk and the gate start pulse GSP are respectively input to the source driver 46 and the gate driver 44 to control the operation timing of the source driver 46 and the gate driver 44. In addition, the time controller 42 will input a control signal to the backlight controller 48, so that the backlight controller will input a pulse signal to each inverter 503, 5013, 5 (^ and 50 (1, and Each of the inverters 5 (^, 501), 50c, and 50d can drive the lamps 40a, 40b, 40c, and 40d according to the respective pulse wave signals to generate appropriate brightness. ^ Such as As shown in FIG. 3, when the gate driver 44 receives the gate starting pulse GSp, the interrogator driver 44 will generate a scanning signal Si correspondingly, and transmit the scanning signal & to the scanning line of the first column. SL ·, and the scanning signal & will be transmitted to each thin film via scanning line SL · 11 200528833 DL.DL, ^: Z ^ T 46 After receiving the audio image T, each pixel 36 of Lu 1 will pass through each data line DLi ~ DL, and j 茨 ~ like bluff, and each Guixin Ru raft # 密 # on the scan line SL · and maintain the "transmittance" and wait for the first column to play a ringing bell… One '& ^ Urame peri〇d). The gate driver cries 44 times] / After each day element% has received the image signal, the 1 1-pole driver 44 transmits a scanning signal & to the 2nd-Leon, 2 to open the connection In the scan line J brother: 歹 "The above steps to complete the LCD display 30 _ day and time sub-repetition Figure 3 method and control timing will be explained as follows. For example, the pulse wave tube ρ input at the pulse-pulse wave signal to inverter 50a, which
:=^1#具有細_週期τ，_ T 面時段L係分別相等於液晶顯示器30的一個晝 於第一列掃描線SL,，—因1金不面T的控制時序係同步 影像訊號60至第-列掃M Si' 内’源極驅動器44輸出一 依據脈诂w + I田、1上的各旦素36，同時，反相器50a並 i 伽細雜高的亮度 古t a/生亮度較低的亮度Li。值得注意的是，亮 ;冗又亚且免度11高於零（亦即：燈管4Ga不會完全地被 :=====;此，本發明係- 示器30的拖影現象，而的可提度升：3^f會，到液晶顯 ^ , 攸丌，促阳鎮不态3〇的畫面品質。必須注咅、 、弟歹制田、線SL·。也就是說，製造商可依 特性或其它製程參數，而使燈管40a的控^=== 12 200528833 SLl-SLn (谷旦素36之先牙透率係隨時間增加而增加，而在書 段^内，第-列掃描線SLl上之各晝素36的光穿透率氣約^^之^ 一方面’在畫面職Td之時段M，第—列掃描、線％上之久另 之^穿透率係隨時間增加而減少，而在晝面週期L之時段^内旦素^ 列掃心線SL·上之各晝素36的光穿透率係約略固定。 另-方面’其它燈管4〇b、4〇c與_的驅動方式係與燈管 5，亦即，背光控制器46會分別輸入脈波訊號p2、朽與？4至各 ’而各反相器50b、50c與50d係可依據各脈波訊餘、 !0c"40d 5 40b'40c # 4〇d twi冗度免度唯一不同的是，各脈波訊號Pl、P2、p3金 p4係彼此具有-時間差M，而使得各燈管術、働、撕盘 · 度控制時序如圖六所示，其中時間差ΔΤ係小於晝面週期Tc盘τ ^ "；/2' Ρ3^ 30 不特f或八匕製程參數。如圖六所示，當其中一個燈管術、働、撕 時’緊接著便會有另—個燈管由亮度 W成党度Ll，例如：當燈管4〇a即將由亮度匕變成亮度[時，燈管 〇b便由党度變成亮度Ll ’如此一來，本發明不僅可藉由週期性且輪 循地調整燈管' 40b、40c與40d的亮度變化，以讓一使用者不會 感覺到液，顯示器30的拖影現象，本發明更可有效提升晝面的整體亮 度，以提高液晶顯示器30的晝面品質。 才目較於習知技術，由於本發明之背光模組34係週期性_生亮度 b與党度L· ’而無須連續地開啟與關閉各燈管偷、働、伽與權， 因此，本發明之方法係可增加燈管4〇a、伽、4〇c與的壽命，並 降低製造燈管40a、4Gb、撕與的生產成本。此外，由於各燈管 13 200528833 40a、40b、40c與40d係週期性地在亮度L·與亮度L之間變換大 可提升畫面的整體受:度，並縮短亮度變化的響應時間。 、口此 以上所述僅為本發明之較佳實施例，凡依本發明申請專 做之均等變化與修飾，皆應屬本發明專利之涵蓋範圍。明，乾圍所 【圖式簡單說明】 圖式之簡單說明: = ^ 1 # has a fine _ period τ, _ T plane period L is equal to one day and first scan line SL of the liquid crystal display 30, respectively,-because of the control timing of 1 gold plane T, the synchronous image signal 60 To the first column M Si 'in' the source driver 44 outputs a pulse 36 on the pulse w + I field, 1 at the same time, at the same time, the inverter 50a and i have high brightness and high brightness. Lower brightness Li. It is worth noting that the bright; redundant and avoidance degree 11 is higher than zero (that is, the lamp 4Ga will not be completely: =====; therefore, the present invention is a smear phenomenon of the indicator 30, The degree of improvement can be increased: 3 ^ f will, to the LCD display ^, 丌 丌, to promote the picture quality of the town of Yang 30. You must pay attention to 咅, 歹 歹 field, line SL ·. In other words, manufacturing According to the characteristics or other process parameters, the control of the lamp 40a can be controlled according to characteristics or other process parameters. ^ === 12 200528833 SLl-SLn -The light transmittance of each day element 36 on the column scan line SL1 is about ^^^ On the one hand, during the period M of the screen position Td, the first column scan, the line% is long and the other is the transmittance. It decreases with the increase of time, and the light transmittance of each day element 36 on the columnar heart line SL · is approximately fixed during the period L of the diurnal cycle L. The other aspect is the other lamp tube 40 The driving method of the 4c and 4c is the same as that of the light tube 5, that is, the backlight controller 46 will input the pulse wave signals p2, 2 and 4 respectively, and the inverters 50b, 50c, and 50d may be based on All pulse waves,! 0c " 40d 5 40b'40c # 4 The only difference between d twi redundancy is that each pulse wave signal Pl, P2, p3, and gold p4 series have a time difference M from each other, so that the control sequence of each lamp tube, cymbal, and tear disk is shown in Figure 6, Among them, the time difference ΔΤ is smaller than the day-to-day cycle Tc disc τ ^ " / 2 'ρ3 ^ 30 is not a special f or eight dagger process parameters. As shown in Figure 6, when one of the lamp operation, 働, tearing is immediately followed by Then there will be another lamp from the brightness W to the degree Ll, for example: when the lamp 40a is about to change from the brightness dagger to the brightness [, the lamp 0b will change from the brightness to the brightness Ll ' The invention can not only adjust the brightness changes of the lamps' 40b, 40c, and 40d periodically and in turn, so that a user will not feel the smear phenomenon of the liquid, the display 30, and the invention can effectively improve the daytime surface. In order to improve the quality of the daytime display of the liquid crystal display 30, compared with the conventional technology, since the backlight module 34 of the present invention is a periodic brightness b and a degree L · ', there is no need to continuously turn on and off. Each lamp steals, sighs, lights, and weights. Therefore, the method of the present invention can increase the lights 40a, 400, and 40. c and the life of the lamp, and reduce the production costs of manufacturing the lamps 40a, 4Gb, and tear. In addition, since each lamp 13 200528833 40a, 40b, 40c, and 40d are periodically changed between the brightness L · and the brightness L It can improve the overall image quality and shorten the response time of the brightness change. The above description is only a preferred embodiment of the present invention. Any equal changes and modifications specially made according to the application of the present invention should belong to the present invention. Coverage of invention patents. Ming and Qianwei [Simplified description of the drawings] Simple description of the drawings
圖一係為一液晶顯示器之剖面示意圖。 圖二係為習知解決液晶顯示器之拖影現象的方法示意圖。 圖三係為本發明液晶顯示器之方塊圖。 “ 圖四與圖五係為本發明液晶顯示||之驅動方法 圖六係為本㈣背光歡之燈管及其姉應的控制日辨= 圖式之符號說明 10 液晶顯示器 14 背光模組 18 下基板 22 光源 22b 反射板 26 電壓脈波 32 顯示面板 36 晝素 40a 直形燈管 40c 直形燈管 12 顯示面板 16 上基板 20 液晶分子 22a 直形燈管 24 擴散板 30 液晶顯示 34 背光模組 38 外殼 40b 直形燈管 40d 直形燈管FIG. 1 is a schematic cross-sectional view of a liquid crystal display. FIG. 2 is a schematic diagram of a conventional method for solving the smear phenomenon of a liquid crystal display. FIG. 3 is a block diagram of a liquid crystal display of the present invention. "Figures 4 and 5 are the driving methods of the liquid crystal display of the present invention. || Figure 6 is the lamp of the backlight and its corresponding control panel. = Symbol description of the drawing 10 LCD display 14 Backlight module 18 Lower substrate 22 Light source 22b Reflective plate 26 Voltage pulse wave 32 Display panel 36 Daylight 40a Straight tube 40c Straight tube 12 Display panel 16 Upper substrate 20 Liquid crystal molecules 22a Straight tube 24 Diffuser plate 30 Liquid crystal display 34 Backlight mode Group 38 Housing 40b Straight Light Tube 40d Straight Light Tube
14 200528833 42 時間控制器 44 閘極驅動器 46 源極驅動器 48 背光控制器 50a 反相器 50b 反相器 50c 反相器 50d 反相器 1514 200528833 42 Time controller 44 Gate driver 46 Source driver 48 Backlight controller 50a Inverter 50b Inverter 50c Inverter 50d Inverter 15