201025247 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種背光模組、顯示裳置及其驅 法’特別關於-種能解決閃爍問題的背光模組、顯 及其驅動方法。 〜直 【先前技術】 -般來說，平面顯示m藉由—背光模組以及—顯 示模組相互搭配使用，以產生各種影像晝面。在背光模組 中’是利用發光單元產生顯示模組所需要㈣光源，而為 了省電或是配合影像晝面的變化，通常是以脈寬調變 (pulse-width modulation，PWM)方式來進行調光，其原 理為調整脈寬調變訊號之工作週期（dmycycle)來達到調 光的目的。 ° 如圖1所示，一種習知的背光模組丨之一發光單元14 m 的驅動電路包含一訊號產生單元11、一控制單元12以芬 φ —電源轉換單元13。贿產生單元„產生 唬sPWM1並輸出至控制單元12。控制單元12依據脈寬調 變訊號sPWM1及控制單元12所產生的一驅動控制訊號（圖 未顯不），以輸出一切換控制訊號Ssl。電源轉換單元13 依據切換控制汛號SS1輸出一驅動訊號SD1以驅動發光單 元14。 由於脈寬調變訊號sPWM1及驅動控制訊號並非根據同 一時脈訊號而同步產生，導致脈寬調變訊號SPWM】與驅動 201025247 控制訊號之間有一相位差，當發光單元14是處於高亮度 時，由於其工作週期較大，故脈寬調變訊號Spw⑷與驅動 控制訊號之間的相位差不致於對顯示晝面產生影響，然 而，當發光單元14是處於低亮度時，由於其工作週期較 小，因而此相位差會使人眼感受到顯示畫面的閃爍現象。 因此，如何提供一種背光模組、顯示裝置及其驅動方 法，可消除脈寬調變訊號與驅動控制訊號之間的相位差， 以改善人眼所感受到的關現象，實為當前重要绿題之 【發明内容】 的為提供一種能改善人 、顯示裝置及其驅動方 有鑑於上述課題，本發明之目 眼所感受到的閃爍現象的背光模組 法0 …為達上述目的，依本發明之―種背光模組包含—201025247 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module, a display skirt, and a driving method thereof, particularly relating to a backlight module capable of solving a flicker problem, and a driving method thereof. ~ Straight [Prior Art] In general, the flat display m is used by the backlight module and the display module to generate various image planes. In the backlight module, the light source is used to generate the display module (4), and in order to save power or to match the change of the image surface, the pulse width modulation (PWM) method is usually used. Dimming, the principle is to adjust the duty cycle of the pulse width modulation signal (dmycycle) to achieve the purpose of dimming. As shown in FIG. 1 , a driving circuit of a light-emitting unit 14 m of a conventional backlight module includes a signal generating unit 11 and a control unit 12 as a power converter unit 13 . The bribe generating unit generates the 唬sPWM1 and outputs it to the control unit 12. The control unit 12 outputs a switching control signal Ss1 according to the pulse width modulation signal sPWM1 and a driving control signal generated by the control unit 12 (not shown). The power conversion unit 13 outputs a driving signal SD1 according to the switching control signal SS1 to drive the light emitting unit 14. Since the pulse width modulation signal sPWM1 and the driving control signal are not synchronously generated according to the same clock signal, the pulse width modulation signal SPWM is generated. There is a phase difference between the control signal and the drive 201025247. When the illumination unit 14 is in high brightness, the phase difference between the pulse width modulation signal Spw(4) and the drive control signal is not displayed on the display due to its large duty cycle. The effect is affected. However, when the light-emitting unit 14 is in low brightness, the phase difference causes the human eye to feel the flickering phenomenon of the display screen due to the small duty cycle thereof. Therefore, how to provide a backlight module and a display device and The driving method can eliminate the phase difference between the pulse width modulation signal and the driving control signal to improve the feeling of the human eye. The phenomenon of the closing phenomenon is actually a backlight module method capable of improving the flicker phenomenon perceived by the eye of the present invention in view of the above-mentioned problems, in order to improve the person, the display device, and the driver thereof. 0 ... for the above purpose, according to the invention, the backlight module comprises -
早兀、—崎產生單元、—控制單元及-電源轉換單元。 訊號產生單核據—時脈同步訊號產生—脈寬調變訊 5虎。控制早凡係接收脈寬調變訊號，並依據脈 及一驅動控制訊號以輸出-切換控制訊號，其中驅動^ 訊號係依據與時脈同步訊號㈣應之 工 生。^轉換單元係接收切換㈣訊號，並據以輸區 動訊號以驅動發光單元。 展 為達上述目的’依树明之—射光模_ 包含以下步驟•·依據—拄 勒万法 守脈同步訊號產生一脈寬調變訊 7 201025247 號；依據與時脈同步訊號相對應之—時脈訊號產生一驅動 •控制訊號；依據脈寬調變訊號及驅動控制訊號輸出一切換 -·控龍號；以及依據切換控制《輸出訊號，以驅 動一發光單元。 為達上述目的，依本發明之一種顯示裝置包含一顯示 面板及一背光模組。背光模組鄰設於顯示面板，並具有一 發光單元、一訊號產生單元、一控制單元及一電源轉換單 凡。訊號產生單元依據-時脈同步訊號產生一脈寬調變訊 遠。控制單元係接收脈寬調變訊號，並依據脈寬調變訊號 及一驅動控制訊號以輸出一切換控制訊號，其中驅動控制 訊號係依據與時脈同步訊號相對應之一時脈訊號而產 生。電源轉換單元係接收切換控制訊號，並據以輸出一驅 動訊號以驅動發光單元。 為達上述目的，依本發明之一種顯示裝置的驅動方法 包含以下步驟：依據—時脈同步訊號產生—脈寬調變訊 眷就；依據與時脈同步訊號相對應之—時脈訊號產生一驅動 控制訊號，依據脈寬調變訊號及驅動控制訊號輸出—切換 控制訊號；以及依據切換控制訊號輪出一驅動訊號，以驅 動一發光單元。 承上^述’目依本發明之背光模組、顯示裝置及其驅 方法-藉由控制單元依據一脈寬調變訊號及一驅動控制 .訊號以輸出-切換控制訊號，其中由於脈寬調變訊號係藉 由“時脈同步訊號產生，且驅動控制訊號係依據與時脈同 步π號相對應之一時脈訊號而產生，因此脈寬調變訊號與 8 201025247 驅動控制訊號係依據相同的時脈訊號而同步產生，因而可 避免脈寬調變訊號與驅動控制訊號之間產生相位差，進而 能夠改善人眼所感受到顯示晝面的閃爍現象。 【實施方式】 以下將參照相關圖式，說明依本發明較佳實施例之背 光模組、顯示裝置及其驅動方法，其中相同的元件將以相 同的參照符號加以說明。 ® 如圖2所示，本發明較佳實施例之背光模組2包含一 訊號產生單元21、一控制單元22、一電源轉換單元23及 一發光單元24。在本實施例中，背光模組2以應用於液晶 顯示裝置為例，當然，背光模組2亦可應用於其他電子裝 置，例如照明裝置。 ' 訊號產生單元21依據一時脈同步訊號（clock synchronization signal) Scs 產生一脈寬調變訊號 SPWM2。 訊號產生單元21設置於一時序控制器（timing controller ) @ 中或整合於一積體電路中。本實施例中以訊號產生單元21 設置於一時序控制器為例。 請同時參考圖2及圖3，控制單元22與訊號產生單元 21電性連接，控制單元22接收脈寬調變訊號SPWM2，並依 據脈寬調變訊號S PWM2 及一 驅動控制訊號Sdc (如圖3所 示）以輸出一切換控制訊號Ss2。其中驅動控制訊號SDC 係依據與時脈同步訊號Scs相對應之一時脈訊號（圖未顯 不）而產生。在本貫施例中’驅動控制訊號Sdc係用以驅 9 201025247 動發光單元24發光，其頻率約為40ΚΗζ〜60ΚΗζ。另外， 本實施例中，控制單元22中包含一時脈產生器（圖未顯 示），例如為一振盪器，時脈產生器可產生時脈訊號，而 控制單元22依據時脈訊號以產生驅動控制訊號SDC。Early 兀, - 崎 generating unit, - control unit and - power conversion unit. The signal generates a single-core data-synchronous signal generation-pulse width modulation. The control system receives the pulse width modulation signal and outputs a switching control signal according to the pulse and a driving control signal, wherein the driving signal is based on the clock synchronization signal (4). The conversion unit receives the switching (four) signal and drives the lighting unit according to the transmission signal. The exhibition is for the above purpose 'Yi Shuming' - the light mode _ contains the following steps: · According to the 拄 万 万 守 守 守 产生 产生 产生 产生 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 The pulse signal generates a driving and control signal; according to the pulse width modulation signal and the driving control signal output, a switching - control dragon number; and according to the switching control "output signal to drive an illumination unit. To achieve the above object, a display device according to the present invention comprises a display panel and a backlight module. The backlight module is adjacent to the display panel and has a light emitting unit, a signal generating unit, a control unit and a power conversion unit. The signal generating unit generates a pulse width modulation signal according to the -clock synchronization signal. The control unit receives the pulse width modulation signal and outputs a switching control signal according to the pulse width modulation signal and a driving control signal, wherein the driving control signal is generated according to a clock signal corresponding to the clock synchronization signal. The power conversion unit receives the switching control signal and outputs a driving signal to drive the lighting unit. In order to achieve the above object, a driving method of a display device according to the present invention comprises the steps of: generating a pulse width modulation signal according to a clock synchronization signal; generating a signal according to a clock signal corresponding to a clock synchronization signal. Driving the control signal, according to the pulse width modulation signal and the driving control signal output, switching the control signal; and rotating a driving signal according to the switching control signal to drive a lighting unit. The backlight module, the display device and the driving method thereof according to the invention are controlled by the control unit according to a pulse width modulation signal and a driving control signal to output a switching control signal, wherein the pulse width is adjusted The variable signal is generated by the "clock synchronization signal, and the drive control signal is generated according to one of the clock signals corresponding to the clock synchronization π number. Therefore, the pulse width modulation signal is the same as the 8 201025247 drive control signal. The pulse signal is generated synchronously, so that the phase difference between the pulse width modulation signal and the driving control signal can be avoided, and the flickering phenomenon of the display pupil surface can be improved by the human eye. [Embodiment] The following description will be made with reference to the related drawings. The backlight module, the display device and the driving method thereof according to the preferred embodiment of the present invention, wherein the same components will be denoted by the same reference symbols. As shown in FIG. 2, the backlight module 2 of the preferred embodiment of the present invention is shown in FIG. The signal generating unit 21, a control unit 22, a power converting unit 23 and a light emitting unit 24. In the embodiment, the backlight module 2 is applied to the liquid crystal. For example, the backlight module 2 can also be applied to other electronic devices, such as lighting devices. The signal generating unit 21 generates a pulse width modulation signal SPWM2 according to a clock synchronization signal Scs. The unit 21 is disposed in a timing controller @ or integrated in an integrated circuit. In this embodiment, the signal generating unit 21 is disposed in a timing controller as an example. Please refer to FIG. 2 and FIG. 3 at the same time. The control unit 22 is electrically connected to the signal generating unit 21, and the control unit 22 receives the pulse width modulation signal SPWM2, and outputs a switching control according to the pulse width modulation signal S PWM2 and a driving control signal Sdc (as shown in FIG. 3). Signal Ss2, wherein the drive control signal SDC is generated according to a clock signal corresponding to the clock synchronization signal Scs (not shown). In the present embodiment, the 'drive control signal Sdc is used to drive 9 201025247 The unit 24 emits light, and its frequency is about 40 ΚΗζ 60 ΚΗζ 60. In addition, in this embodiment, the control unit 22 includes a clock generator (not shown), for example. Is an oscillator, clock generator may generate a clock signal, the clock signal when the control unit 22 based on a drive control signal to generate a SDC.
電源轉換單元23分別與控制單元22及發光單元24 電性連接，且電源轉換單元23接收切換控制訊號Ss2，並 據以輸出一驅動訊號SD2以驅動發光單元24。如圖2所 示，電源轉換單元23更包含一切換電路231及一變壓電 路 232。 切換電路231接收切換控制訊號Ss2，並據以輸出一 功率訊號SP，其中，切換電路231例如但不限於一半橋式 切換迴路、一全橋式切換迴路或一推挽式切換迴路。且切 換電路231係包含至少一雙載子電晶體（BJT)、至少一場 效電晶體（FET)或至少一二極體，其主要係依據切換控 制訊號Ss2而進行開（turn on )、關（turn off)的動作。 變壓電路232接收功率訊號SP，並據以輸出驅動訊號 SD2以驅動發光單元24。其中變壓電路232係可為一升壓 迴路或為一降壓迴路，於此係以升壓迴路為例，而發光單 元24係以螢光燈管為例說明。 在本貫施例中’時脈同步訊號Scs係由控制早元22輸 出至訊號產生單元21，以供其參考而同步產生脈寬調變訊 號Sp\VM2 ’也就是說’脈見調變訊號Sp\VM2與時脈同步訊 號Scs可於同一起始點作動，因而可避免脈寬調變訊號 SpWM2 與驅動控制訊號SDC之間產生相位差。當發光單元 10 201025247 &她與驅動控制訊 的閃爍現象。 _受_示晝© 2的4齡，料本發㈣之背光模組 :t化=。如圖4所示’背光模級以更可包含一時脈 產生早几25 ’其係與控制單元22電性連接 脈訊號St輸出至控制單元22。控制 、’ 、 S以姦也sr知. 利早兀22依據時脈訊號 8丁以產生驅動控制訊號Sdc與時脈同步訊號^ 。 請參考圖5所示，其為本發明章 b Cs 2的另一傲仆悠掸^ 月季乂佳貧施例之背光模組 叮“所示’時脈同步訊泸S除了 可由控制單元22產生外，更可由 广:唬Scs除了 單元Μ產生，並將時脈同步訊號^^且2b之電源轉換 2i。 〇 K^Scs回授至訊號產生單元 值得一提的是，由於由電源轉 同步訊號SCS，其電壓高於訊號產生軍早元？輸出嘛 因此，本實施例”域組2,更^'21，工作電壓’ 別與訊號產生單元21及電源轉換^ ^減11 26，其分 器26接收來自電源轉換單元23的時兀:性連接。衰減 ::a時脈同步訊號s一電壓振幅5並 付合讯號產生單元21之 二脈间步心虎Scs 同步訊Ψ s 。在本貧施例中，時脈 振幅例“e2s4v，在/ '，231的輸出端輸出，其電壓 同步訊號&，再衰減成例如5V的時脈 如圖二產4:…供參考。 1 乂佳戶、知例之一種背光模組的驅 201025247 動方法包含步驟S11至步驟si4。 步驟S11係依據—時脈同步訊號產生—脈寬調變訊 號；步驟S12係、依據與時脈同步訊號相對應之一時脈訊號 產生驅動控制讯號；步驟S13係依據脈寬調變訊號及驅 動控制訊號輸出一切換控制訊號；步驟S14係依據切換控 制訊號輸出一驅動訊號，以驅動一發光單元。由於背光模 組的驅動方法已於上述實施例敘明，故不再贅述。' 、The power conversion unit 23 is electrically connected to the control unit 22 and the illumination unit 24, respectively, and the power conversion unit 23 receives the switching control signal Ss2, and outputs a driving signal SD2 to drive the illumination unit 24. As shown in FIG. 2, the power conversion unit 23 further includes a switching circuit 231 and a variable piezoelectric circuit 232. The switching circuit 231 receives the switching control signal Ss2 and outputs a power signal SP, wherein the switching circuit 231 is, for example but not limited to, a half bridge switching circuit, a full bridge switching circuit or a push-pull switching circuit. The switching circuit 231 includes at least one bipolar transistor (BJT), at least one field transistor (FET) or at least one diode, which is mainly turned on and off according to the switching control signal Ss2. Turn off) action. The voltage converting circuit 232 receives the power signal SP and outputs the driving signal SD2 to drive the light emitting unit 24. The transformer circuit 232 can be a step-up loop or a step-down loop. The booster loop is taken as an example, and the illuminating unit 24 is exemplified by a fluorescent tube. In the present embodiment, the clock synchronizing signal Scs is outputted from the control element 22 to the signal generating unit 21 for reference to synchronously generate the pulse width modulation signal Sp\VM2 'that is, the pulse modulation signal Sp\VM2 and the clock synchronization signal Scs can be operated at the same starting point, thereby avoiding a phase difference between the pulse width modulation signal SpWM2 and the driving control signal SDC. When the light unit 10 201025247 & she and the drive control signal flicker. _ 4 years old by _ 昼 昼 © 2, the backlight module of the hair (4): t =. As shown in FIG. 4, the backlight module can be further connected to the control unit 22 by electrically connecting the pulse signal St to the control unit 22 by generating a clock. Control, ', S is also known as traits. Li early 22 based on the clock signal 8 to generate the drive control signal Sdc and clock synchronization signal ^. Please refer to FIG. 5 , which is another immersive 掸 掸 月 月 月 月 月 贫 贫 贫 贫 贫 贫 贫 贫 叮 叮 叮 叮 所示 所示 所示 所示 所示 时 时 时 时 时 时 时 时 时 时 时 时 时 时 时 时In addition, it can be widely used: 唬Scs is generated in addition to the unit ,, and the power of the clock synchronization signal ^^ and 2b is converted to 2i. 〇K^Scs feedback to the signal generation unit is worth mentioning, because the power is converted to the synchronous signal SCS, its voltage is higher than the signal generation army early yuan? Output, therefore, this embodiment "domain group 2, more ^ '21, the operating voltage ' and the signal generation unit 21 and power conversion ^ ^ minus 11 26, its divider 26 receives the time from the power conversion unit 23: a sexual connection. Attenuation::a clock synchronization signal s a voltage amplitude of 5 and the sum signal generation unit 21 of the two-pulse step-by-step Schs synchronization signal s. In this lean example, the clock amplitude example "e2s4v, output at the output of / ', 231, its voltage synchronization signal &, then decays to a clock such as 5V as shown in Fig. 2: for reference. The driving method of the backlight module of the jiajia household and the known example includes the step S11 to the step si4. The step S11 is based on the clock synchronization signal generation-pulse width modulation signal; the step S12 is based on the synchronization signal with the clock. Corresponding one of the clock signals generates a driving control signal; step S13 outputs a switching control signal according to the pulse width modulation signal and the driving control signal; and step S14 outputs a driving signal according to the switching control signal to drive a lighting unit. The driving method of the backlight module has been described in the above embodiments, and therefore will not be described again.
…本發明較佳實施例之顯示裝置包含-顯示面板及- 背光模組，其中背光模組鄰設於顯示面板。由於背光模組 已於上述實施例敘明，故不再贅述。 ' 、、 力 方法…： 佳實施例之一種顯示裝置的驅動 方法與上述之步驟S11 衣1 j靶勒 贅述。 ^S14相同，故於此不再加以 動方法，藉由控制單元 2模、且❻不裝置及其驅 訊號以輸出—切換於制=一脈寬調變訊號及—驅動控制 由-時脈同步訊號於脈寬調變訊號係藉 步訊號相對應之-時脈訊號舆時脈同 驅動控制訊號係依據同一時脈 此脈見調變訊號與 免脈寬調變訊號與驅動控制c產生，因而可避 善人眼所感受到的閃爍現象。 3生相位差，進而改 以上所述僅為舉例性，而 本發明之精神與範疇，而對其進^性者。任何未脫離 應包含於後附之申請專利範圍中:之等效修改或變更，均 12 201025247 【圖式簡單說明】 圖1為一種習知背光模組之發光單元的驅動電路方塊 示意圖； 圖2為依據本發明較佳實施例之一種背光模組之發光 單元的驅動電路方塊示意圖； 圖3為驅動電路之時脈同步訊號的示意圖； 圖4及圖5為本發明較佳實施例之背光模組的變化態 樣示意圖；以及 ® 圖6為依據本發明較佳實施例之一種背光模組之驅動 方法的流程圖。 【主要元件符號說明】 I、 2、2a、2b :背光模組 II、 21 :訊號產生單元 12、22 :控制單元 ^ 13、23 :電源轉換單元 231 :切換電路 232 :變壓電路 14、24 :發光單元 25 :時脈產生單元 26 :衰減器The display device of the preferred embodiment of the present invention comprises a display panel and a backlight module, wherein the backlight module is adjacent to the display panel. Since the backlight module has been described in the above embodiments, it will not be described again. ', force method...: A driving method of a display device of a preferred embodiment is described in detail with the above-mentioned step S11. ^S14 is the same, so no longer move the method, by the control unit 2, and the device and its drive signal to output - switch to the system = a pulse width modulation signal and - drive control by - clock synchronization The signal is corresponding to the pulse width modulation signal. The clock signal 舆 clock and the drive control signal are generated according to the same clock. The pulse is modulated by the pulse and the pulse width modulation signal and the drive control c are generated. It can avoid the flickering phenomenon that the human eye feels. 3 The phase difference is further changed, and the above description is merely exemplary, and the spirit and scope of the present invention are inherited. Any equivalent modification or change that should be included in the scope of the appended claims: 12 201025247 [Simple description of the drawings] FIG. 1 is a block diagram of a driving circuit of a light-emitting unit of a conventional backlight module; FIG. 3 is a schematic diagram of a clock synchronization signal of a driving circuit according to a preferred embodiment of the present invention; FIG. 3 is a schematic diagram of a backlight module of a preferred embodiment of the present invention; A schematic diagram of a variation of a group; and FIG. 6 is a flow chart of a driving method of a backlight module in accordance with a preferred embodiment of the present invention. [Description of main component symbols] I, 2, 2a, 2b: backlight module II, 21: signal generating unit 12, 22: control unit ^ 13, 23: power conversion unit 231: switching circuit 232: transformer circuit 14, 24 : illumination unit 25: clock generation unit 26: attenuator
Sdi、Sd2 :驅動訊號 SDC .驅動控制訊號 Sp :功率訊號 13 201025247Sdi, Sd2: drive signal SDC. Drive control signal Sp: power signal 13 201025247
SpWMl、SpwM2 :脈寬言周變訊號 , ssl、SS2 :切換控制訊號 ST :時脈訊號 Scs :時脈同步訊號SpWMl, SpwM2: pulse width change signal, ssl, SS2: switching control signal ST: clock signal Scs: clock synchronization signal
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